Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
722c9a0c | 3 | * NET3 Protocol independent device support routines. |
1da177e4 | 4 | * |
1da177e4 | 5 | * Derived from the non IP parts of dev.c 1.0.19 |
722c9a0c | 6 | * Authors: Ross Biro |
1da177e4 LT |
7 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
8 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
9 | * | |
10 | * Additional Authors: | |
11 | * Florian la Roche <rzsfl@rz.uni-sb.de> | |
12 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
13 | * David Hinds <dahinds@users.sourceforge.net> | |
14 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
15 | * Adam Sulmicki <adam@cfar.umd.edu> | |
16 | * Pekka Riikonen <priikone@poesidon.pspt.fi> | |
17 | * | |
18 | * Changes: | |
19 | * D.J. Barrow : Fixed bug where dev->refcnt gets set | |
722c9a0c | 20 | * to 2 if register_netdev gets called |
21 | * before net_dev_init & also removed a | |
22 | * few lines of code in the process. | |
1da177e4 LT |
23 | * Alan Cox : device private ioctl copies fields back. |
24 | * Alan Cox : Transmit queue code does relevant | |
25 | * stunts to keep the queue safe. | |
26 | * Alan Cox : Fixed double lock. | |
27 | * Alan Cox : Fixed promisc NULL pointer trap | |
28 | * ???????? : Support the full private ioctl range | |
29 | * Alan Cox : Moved ioctl permission check into | |
30 | * drivers | |
31 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI | |
32 | * Alan Cox : 100 backlog just doesn't cut it when | |
33 | * you start doing multicast video 8) | |
34 | * Alan Cox : Rewrote net_bh and list manager. | |
722c9a0c | 35 | * Alan Cox : Fix ETH_P_ALL echoback lengths. |
1da177e4 LT |
36 | * Alan Cox : Took out transmit every packet pass |
37 | * Saved a few bytes in the ioctl handler | |
38 | * Alan Cox : Network driver sets packet type before | |
39 | * calling netif_rx. Saves a function | |
40 | * call a packet. | |
41 | * Alan Cox : Hashed net_bh() | |
42 | * Richard Kooijman: Timestamp fixes. | |
43 | * Alan Cox : Wrong field in SIOCGIFDSTADDR | |
44 | * Alan Cox : Device lock protection. | |
722c9a0c | 45 | * Alan Cox : Fixed nasty side effect of device close |
1da177e4 LT |
46 | * changes. |
47 | * Rudi Cilibrasi : Pass the right thing to | |
48 | * set_mac_address() | |
49 | * Dave Miller : 32bit quantity for the device lock to | |
50 | * make it work out on a Sparc. | |
51 | * Bjorn Ekwall : Added KERNELD hack. | |
52 | * Alan Cox : Cleaned up the backlog initialise. | |
53 | * Craig Metz : SIOCGIFCONF fix if space for under | |
54 | * 1 device. | |
55 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there | |
56 | * is no device open function. | |
57 | * Andi Kleen : Fix error reporting for SIOCGIFCONF | |
58 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF | |
59 | * Cyrus Durgin : Cleaned for KMOD | |
60 | * Adam Sulmicki : Bug Fix : Network Device Unload | |
61 | * A network device unload needs to purge | |
62 | * the backlog queue. | |
63 | * Paul Rusty Russell : SIOCSIFNAME | |
64 | * Pekka Riikonen : Netdev boot-time settings code | |
65 | * Andrew Morton : Make unregister_netdevice wait | |
722c9a0c | 66 | * indefinitely on dev->refcnt |
67 | * J Hadi Salim : - Backlog queue sampling | |
1da177e4 LT |
68 | * - netif_rx() feedback |
69 | */ | |
70 | ||
7c0f6ba6 | 71 | #include <linux/uaccess.h> |
aabb4af9 | 72 | #include <linux/bitmap.h> |
4fc268d2 | 73 | #include <linux/capability.h> |
1da177e4 LT |
74 | #include <linux/cpu.h> |
75 | #include <linux/types.h> | |
76 | #include <linux/kernel.h> | |
08e9897d | 77 | #include <linux/hash.h> |
5a0e3ad6 | 78 | #include <linux/slab.h> |
1da177e4 | 79 | #include <linux/sched.h> |
f1083048 | 80 | #include <linux/sched/mm.h> |
4a3e2f71 | 81 | #include <linux/mutex.h> |
11d6011c | 82 | #include <linux/rwsem.h> |
1da177e4 LT |
83 | #include <linux/string.h> |
84 | #include <linux/mm.h> | |
85 | #include <linux/socket.h> | |
86 | #include <linux/sockios.h> | |
87 | #include <linux/errno.h> | |
88 | #include <linux/interrupt.h> | |
89 | #include <linux/if_ether.h> | |
90 | #include <linux/netdevice.h> | |
91 | #include <linux/etherdevice.h> | |
0187bdfb | 92 | #include <linux/ethtool.h> |
1da177e4 | 93 | #include <linux/skbuff.h> |
29863d41 | 94 | #include <linux/kthread.h> |
a7862b45 | 95 | #include <linux/bpf.h> |
b5cdae32 | 96 | #include <linux/bpf_trace.h> |
457c4cbc | 97 | #include <net/net_namespace.h> |
1da177e4 | 98 | #include <net/sock.h> |
02d62e86 | 99 | #include <net/busy_poll.h> |
1da177e4 | 100 | #include <linux/rtnetlink.h> |
1da177e4 | 101 | #include <linux/stat.h> |
b14a9fc4 | 102 | #include <net/dsa.h> |
1da177e4 | 103 | #include <net/dst.h> |
fc4099f1 | 104 | #include <net/dst_metadata.h> |
04f00ab2 | 105 | #include <net/gro.h> |
1da177e4 | 106 | #include <net/pkt_sched.h> |
87d83093 | 107 | #include <net/pkt_cls.h> |
1da177e4 | 108 | #include <net/checksum.h> |
44540960 | 109 | #include <net/xfrm.h> |
e420bed0 | 110 | #include <net/tcx.h> |
1da177e4 LT |
111 | #include <linux/highmem.h> |
112 | #include <linux/init.h> | |
1da177e4 | 113 | #include <linux/module.h> |
1da177e4 LT |
114 | #include <linux/netpoll.h> |
115 | #include <linux/rcupdate.h> | |
116 | #include <linux/delay.h> | |
1da177e4 | 117 | #include <net/iw_handler.h> |
1da177e4 | 118 | #include <asm/current.h> |
5bdb9886 | 119 | #include <linux/audit.h> |
db217334 | 120 | #include <linux/dmaengine.h> |
f6a78bfc | 121 | #include <linux/err.h> |
c7fa9d18 | 122 | #include <linux/ctype.h> |
723e98b7 | 123 | #include <linux/if_arp.h> |
6de329e2 | 124 | #include <linux/if_vlan.h> |
8f0f2223 | 125 | #include <linux/ip.h> |
ad55dcaf | 126 | #include <net/ip.h> |
25cd9ba0 | 127 | #include <net/mpls.h> |
8f0f2223 DM |
128 | #include <linux/ipv6.h> |
129 | #include <linux/in.h> | |
b6b2fed1 DM |
130 | #include <linux/jhash.h> |
131 | #include <linux/random.h> | |
9cbc1cb8 | 132 | #include <trace/events/napi.h> |
cf66ba58 | 133 | #include <trace/events/net.h> |
07dc22e7 | 134 | #include <trace/events/skb.h> |
70713ddd | 135 | #include <trace/events/qdisc.h> |
bf4ea1d0 | 136 | #include <trace/events/xdp.h> |
caeda9b9 | 137 | #include <linux/inetdevice.h> |
c445477d | 138 | #include <linux/cpu_rmap.h> |
c5905afb | 139 | #include <linux/static_key.h> |
af12fa6e | 140 | #include <linux/hashtable.h> |
60877a32 | 141 | #include <linux/vmalloc.h> |
529d0489 | 142 | #include <linux/if_macvlan.h> |
e7fd2885 | 143 | #include <linux/errqueue.h> |
3b47d303 | 144 | #include <linux/hrtimer.h> |
7463acfb | 145 | #include <linux/netfilter_netdev.h> |
40e4e713 | 146 | #include <linux/crash_dump.h> |
b72b5bf6 | 147 | #include <linux/sctp.h> |
ae847f40 | 148 | #include <net/udp_tunnel.h> |
6621dd29 | 149 | #include <linux/net_namespace.h> |
aaa5d90b | 150 | #include <linux/indirect_call_wrapper.h> |
af3836df | 151 | #include <net/devlink.h> |
bd869245 | 152 | #include <linux/pm_runtime.h> |
3744741a | 153 | #include <linux/prandom.h> |
127d7355 | 154 | #include <linux/once_lite.h> |
49e47a5b | 155 | #include <net/netdev_rx_queue.h> |
1da177e4 | 156 | |
6264f58c | 157 | #include "dev.h" |
342709ef PE |
158 | #include "net-sysfs.h" |
159 | ||
1da177e4 | 160 | static DEFINE_SPINLOCK(ptype_lock); |
900ff8c6 CW |
161 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
162 | struct list_head ptype_all __read_mostly; /* Taps */ | |
1da177e4 | 163 | |
ae78dbfa | 164 | static int netif_rx_internal(struct sk_buff *skb); |
26372605 PM |
165 | static int call_netdevice_notifiers_extack(unsigned long val, |
166 | struct net_device *dev, | |
167 | struct netlink_ext_ack *extack); | |
ae78dbfa | 168 | |
1da177e4 | 169 | /* |
7562f876 | 170 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
171 | * semaphore. |
172 | * | |
c6d14c84 | 173 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
174 | * |
175 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 176 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
177 | * actual updates. This allows pure readers to access the list even |
178 | * while a writer is preparing to update it. | |
179 | * | |
180 | * To put it another way, dev_base_lock is held for writing only to | |
181 | * protect against pure readers; the rtnl semaphore provides the | |
182 | * protection against other writers. | |
183 | * | |
184 | * See, for example usages, register_netdevice() and | |
185 | * unregister_netdevice(), which must be called with the rtnl | |
186 | * semaphore held. | |
187 | */ | |
1da177e4 | 188 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
189 | EXPORT_SYMBOL(dev_base_lock); |
190 | ||
6c557001 FW |
191 | static DEFINE_MUTEX(ifalias_mutex); |
192 | ||
af12fa6e ET |
193 | /* protects napi_hash addition/deletion and napi_gen_id */ |
194 | static DEFINE_SPINLOCK(napi_hash_lock); | |
195 | ||
52bd2d62 | 196 | static unsigned int napi_gen_id = NR_CPUS; |
6180d9de | 197 | static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
af12fa6e | 198 | |
11d6011c | 199 | static DECLARE_RWSEM(devnet_rename_sem); |
c91f6df2 | 200 | |
4e985ada TG |
201 | static inline void dev_base_seq_inc(struct net *net) |
202 | { | |
643aa9cb | 203 | while (++net->dev_base_seq == 0) |
204 | ; | |
4e985ada TG |
205 | } |
206 | ||
881d966b | 207 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 208 | { |
8387ff25 | 209 | unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
95c96174 | 210 | |
08e9897d | 211 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
212 | } |
213 | ||
881d966b | 214 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 215 | { |
7c28bd0b | 216 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
217 | } |
218 | ||
e722db8d SAS |
219 | static inline void rps_lock_irqsave(struct softnet_data *sd, |
220 | unsigned long *flags) | |
152102c7 | 221 | { |
e722db8d SAS |
222 | if (IS_ENABLED(CONFIG_RPS)) |
223 | spin_lock_irqsave(&sd->input_pkt_queue.lock, *flags); | |
224 | else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) | |
225 | local_irq_save(*flags); | |
152102c7 CG |
226 | } |
227 | ||
e722db8d | 228 | static inline void rps_lock_irq_disable(struct softnet_data *sd) |
152102c7 | 229 | { |
e722db8d SAS |
230 | if (IS_ENABLED(CONFIG_RPS)) |
231 | spin_lock_irq(&sd->input_pkt_queue.lock); | |
232 | else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) | |
233 | local_irq_disable(); | |
234 | } | |
235 | ||
236 | static inline void rps_unlock_irq_restore(struct softnet_data *sd, | |
237 | unsigned long *flags) | |
238 | { | |
239 | if (IS_ENABLED(CONFIG_RPS)) | |
240 | spin_unlock_irqrestore(&sd->input_pkt_queue.lock, *flags); | |
241 | else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) | |
242 | local_irq_restore(*flags); | |
243 | } | |
244 | ||
245 | static inline void rps_unlock_irq_enable(struct softnet_data *sd) | |
246 | { | |
247 | if (IS_ENABLED(CONFIG_RPS)) | |
248 | spin_unlock_irq(&sd->input_pkt_queue.lock); | |
249 | else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) | |
250 | local_irq_enable(); | |
152102c7 CG |
251 | } |
252 | ||
ff927412 JP |
253 | static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev, |
254 | const char *name) | |
255 | { | |
256 | struct netdev_name_node *name_node; | |
257 | ||
258 | name_node = kmalloc(sizeof(*name_node), GFP_KERNEL); | |
259 | if (!name_node) | |
260 | return NULL; | |
261 | INIT_HLIST_NODE(&name_node->hlist); | |
262 | name_node->dev = dev; | |
263 | name_node->name = name; | |
264 | return name_node; | |
265 | } | |
266 | ||
267 | static struct netdev_name_node * | |
268 | netdev_name_node_head_alloc(struct net_device *dev) | |
269 | { | |
36fbf1e5 JP |
270 | struct netdev_name_node *name_node; |
271 | ||
272 | name_node = netdev_name_node_alloc(dev, dev->name); | |
273 | if (!name_node) | |
274 | return NULL; | |
275 | INIT_LIST_HEAD(&name_node->list); | |
276 | return name_node; | |
ff927412 JP |
277 | } |
278 | ||
279 | static void netdev_name_node_free(struct netdev_name_node *name_node) | |
280 | { | |
281 | kfree(name_node); | |
282 | } | |
283 | ||
284 | static void netdev_name_node_add(struct net *net, | |
285 | struct netdev_name_node *name_node) | |
286 | { | |
287 | hlist_add_head_rcu(&name_node->hlist, | |
288 | dev_name_hash(net, name_node->name)); | |
289 | } | |
290 | ||
291 | static void netdev_name_node_del(struct netdev_name_node *name_node) | |
292 | { | |
293 | hlist_del_rcu(&name_node->hlist); | |
294 | } | |
295 | ||
296 | static struct netdev_name_node *netdev_name_node_lookup(struct net *net, | |
297 | const char *name) | |
298 | { | |
299 | struct hlist_head *head = dev_name_hash(net, name); | |
300 | struct netdev_name_node *name_node; | |
301 | ||
302 | hlist_for_each_entry(name_node, head, hlist) | |
303 | if (!strcmp(name_node->name, name)) | |
304 | return name_node; | |
305 | return NULL; | |
306 | } | |
307 | ||
308 | static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net, | |
309 | const char *name) | |
310 | { | |
311 | struct hlist_head *head = dev_name_hash(net, name); | |
312 | struct netdev_name_node *name_node; | |
313 | ||
314 | hlist_for_each_entry_rcu(name_node, head, hlist) | |
315 | if (!strcmp(name_node->name, name)) | |
316 | return name_node; | |
317 | return NULL; | |
318 | } | |
319 | ||
75ea27d0 AT |
320 | bool netdev_name_in_use(struct net *net, const char *name) |
321 | { | |
322 | return netdev_name_node_lookup(net, name); | |
323 | } | |
324 | EXPORT_SYMBOL(netdev_name_in_use); | |
325 | ||
36fbf1e5 JP |
326 | int netdev_name_node_alt_create(struct net_device *dev, const char *name) |
327 | { | |
328 | struct netdev_name_node *name_node; | |
329 | struct net *net = dev_net(dev); | |
330 | ||
331 | name_node = netdev_name_node_lookup(net, name); | |
332 | if (name_node) | |
333 | return -EEXIST; | |
334 | name_node = netdev_name_node_alloc(dev, name); | |
335 | if (!name_node) | |
336 | return -ENOMEM; | |
337 | netdev_name_node_add(net, name_node); | |
338 | /* The node that holds dev->name acts as a head of per-device list. */ | |
9f308313 | 339 | list_add_tail_rcu(&name_node->list, &dev->name_node->list); |
36fbf1e5 JP |
340 | |
341 | return 0; | |
342 | } | |
36fbf1e5 JP |
343 | |
344 | static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node) | |
345 | { | |
346 | list_del(&name_node->list); | |
36fbf1e5 JP |
347 | kfree(name_node->name); |
348 | netdev_name_node_free(name_node); | |
349 | } | |
350 | ||
351 | int netdev_name_node_alt_destroy(struct net_device *dev, const char *name) | |
352 | { | |
353 | struct netdev_name_node *name_node; | |
354 | struct net *net = dev_net(dev); | |
355 | ||
356 | name_node = netdev_name_node_lookup(net, name); | |
357 | if (!name_node) | |
358 | return -ENOENT; | |
e08ad805 ED |
359 | /* lookup might have found our primary name or a name belonging |
360 | * to another device. | |
361 | */ | |
362 | if (name_node == dev->name_node || name_node->dev != dev) | |
363 | return -EINVAL; | |
364 | ||
1a83f4a7 JK |
365 | netdev_name_node_del(name_node); |
366 | synchronize_rcu(); | |
36fbf1e5 JP |
367 | __netdev_name_node_alt_destroy(name_node); |
368 | ||
369 | return 0; | |
370 | } | |
36fbf1e5 JP |
371 | |
372 | static void netdev_name_node_alt_flush(struct net_device *dev) | |
373 | { | |
374 | struct netdev_name_node *name_node, *tmp; | |
375 | ||
376 | list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list) | |
377 | __netdev_name_node_alt_destroy(name_node); | |
378 | } | |
379 | ||
ce286d32 | 380 | /* Device list insertion */ |
53759be9 | 381 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 382 | { |
8e15aee6 | 383 | struct netdev_name_node *name_node; |
c346dca1 | 384 | struct net *net = dev_net(dev); |
ce286d32 EB |
385 | |
386 | ASSERT_RTNL(); | |
387 | ||
fd888e85 | 388 | write_lock(&dev_base_lock); |
c6d14c84 | 389 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
ff927412 | 390 | netdev_name_node_add(net, dev->name_node); |
fb699dfd ED |
391 | hlist_add_head_rcu(&dev->index_hlist, |
392 | dev_index_hash(net, dev->ifindex)); | |
fd888e85 | 393 | write_unlock(&dev_base_lock); |
8e15aee6 JK |
394 | |
395 | netdev_for_each_altname(dev, name_node) | |
396 | netdev_name_node_add(net, name_node); | |
397 | ||
759ab1ed JK |
398 | /* We reserved the ifindex, this can't fail */ |
399 | WARN_ON(xa_store(&net->dev_by_index, dev->ifindex, dev, GFP_KERNEL)); | |
4e985ada TG |
400 | |
401 | dev_base_seq_inc(net); | |
ce286d32 EB |
402 | } |
403 | ||
fb699dfd ED |
404 | /* Device list removal |
405 | * caller must respect a RCU grace period before freeing/reusing dev | |
406 | */ | |
cc26c266 | 407 | static void unlist_netdevice(struct net_device *dev, bool lock) |
ce286d32 | 408 | { |
8e15aee6 | 409 | struct netdev_name_node *name_node; |
759ab1ed JK |
410 | struct net *net = dev_net(dev); |
411 | ||
ce286d32 EB |
412 | ASSERT_RTNL(); |
413 | ||
759ab1ed JK |
414 | xa_erase(&net->dev_by_index, dev->ifindex); |
415 | ||
8e15aee6 JK |
416 | netdev_for_each_altname(dev, name_node) |
417 | netdev_name_node_del(name_node); | |
418 | ||
ce286d32 | 419 | /* Unlink dev from the device chain */ |
cc26c266 ED |
420 | if (lock) |
421 | write_lock(&dev_base_lock); | |
c6d14c84 | 422 | list_del_rcu(&dev->dev_list); |
ff927412 | 423 | netdev_name_node_del(dev->name_node); |
fb699dfd | 424 | hlist_del_rcu(&dev->index_hlist); |
cc26c266 ED |
425 | if (lock) |
426 | write_unlock(&dev_base_lock); | |
4e985ada TG |
427 | |
428 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
429 | } |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Our notifier list | |
433 | */ | |
434 | ||
f07d5b94 | 435 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
436 | |
437 | /* | |
438 | * Device drivers call our routines to queue packets here. We empty the | |
439 | * queue in the local softnet handler. | |
440 | */ | |
bea3348e | 441 | |
9958da05 | 442 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 443 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 444 | |
1a33e10e CW |
445 | #ifdef CONFIG_LOCKDEP |
446 | /* | |
447 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class | |
448 | * according to dev->type | |
449 | */ | |
450 | static const unsigned short netdev_lock_type[] = { | |
451 | ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
452 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
453 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
454 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
455 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
456 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
457 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
458 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
459 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
460 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
461 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
462 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
463 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, | |
464 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
465 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
466 | ||
467 | static const char *const netdev_lock_name[] = { | |
468 | "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
469 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
470 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
471 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
472 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
473 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
474 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
475 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
476 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
477 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
478 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
479 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
480 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", | |
481 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
482 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
483 | ||
484 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
845e0ebb | 485 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
1a33e10e CW |
486 | |
487 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
488 | { | |
489 | int i; | |
490 | ||
491 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
492 | if (netdev_lock_type[i] == dev_type) | |
493 | return i; | |
494 | /* the last key is used by default */ | |
495 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
496 | } | |
497 | ||
498 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, | |
499 | unsigned short dev_type) | |
500 | { | |
501 | int i; | |
502 | ||
503 | i = netdev_lock_pos(dev_type); | |
504 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
505 | netdev_lock_name[i]); | |
506 | } | |
845e0ebb CW |
507 | |
508 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
509 | { | |
510 | int i; | |
511 | ||
512 | i = netdev_lock_pos(dev->type); | |
513 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
514 | &netdev_addr_lock_key[i], | |
515 | netdev_lock_name[i]); | |
516 | } | |
1a33e10e CW |
517 | #else |
518 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, | |
519 | unsigned short dev_type) | |
520 | { | |
521 | } | |
845e0ebb CW |
522 | |
523 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
524 | { | |
525 | } | |
1a33e10e CW |
526 | #endif |
527 | ||
1da177e4 | 528 | /******************************************************************************* |
eb13da1a | 529 | * |
530 | * Protocol management and registration routines | |
531 | * | |
532 | *******************************************************************************/ | |
1da177e4 | 533 | |
1da177e4 | 534 | |
1da177e4 LT |
535 | /* |
536 | * Add a protocol ID to the list. Now that the input handler is | |
537 | * smarter we can dispense with all the messy stuff that used to be | |
538 | * here. | |
539 | * | |
540 | * BEWARE!!! Protocol handlers, mangling input packets, | |
541 | * MUST BE last in hash buckets and checking protocol handlers | |
542 | * MUST start from promiscuous ptype_all chain in net_bh. | |
543 | * It is true now, do not change it. | |
544 | * Explanation follows: if protocol handler, mangling packet, will | |
545 | * be the first on list, it is not able to sense, that packet | |
546 | * is cloned and should be copied-on-write, so that it will | |
547 | * change it and subsequent readers will get broken packet. | |
548 | * --ANK (980803) | |
549 | */ | |
550 | ||
c07b68e8 ED |
551 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
552 | { | |
553 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 554 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 555 | else |
7866a621 SN |
556 | return pt->dev ? &pt->dev->ptype_specific : |
557 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
558 | } |
559 | ||
1da177e4 LT |
560 | /** |
561 | * dev_add_pack - add packet handler | |
562 | * @pt: packet type declaration | |
563 | * | |
564 | * Add a protocol handler to the networking stack. The passed &packet_type | |
565 | * is linked into kernel lists and may not be freed until it has been | |
566 | * removed from the kernel lists. | |
567 | * | |
4ec93edb | 568 | * This call does not sleep therefore it can not |
1da177e4 LT |
569 | * guarantee all CPU's that are in middle of receiving packets |
570 | * will see the new packet type (until the next received packet). | |
571 | */ | |
572 | ||
573 | void dev_add_pack(struct packet_type *pt) | |
574 | { | |
c07b68e8 | 575 | struct list_head *head = ptype_head(pt); |
1da177e4 | 576 | |
c07b68e8 ED |
577 | spin_lock(&ptype_lock); |
578 | list_add_rcu(&pt->list, head); | |
579 | spin_unlock(&ptype_lock); | |
1da177e4 | 580 | } |
d1b19dff | 581 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 582 | |
1da177e4 LT |
583 | /** |
584 | * __dev_remove_pack - remove packet handler | |
585 | * @pt: packet type declaration | |
586 | * | |
587 | * Remove a protocol handler that was previously added to the kernel | |
588 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
589 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 590 | * returns. |
1da177e4 LT |
591 | * |
592 | * The packet type might still be in use by receivers | |
593 | * and must not be freed until after all the CPU's have gone | |
594 | * through a quiescent state. | |
595 | */ | |
596 | void __dev_remove_pack(struct packet_type *pt) | |
597 | { | |
c07b68e8 | 598 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
599 | struct packet_type *pt1; |
600 | ||
c07b68e8 | 601 | spin_lock(&ptype_lock); |
1da177e4 LT |
602 | |
603 | list_for_each_entry(pt1, head, list) { | |
604 | if (pt == pt1) { | |
605 | list_del_rcu(&pt->list); | |
606 | goto out; | |
607 | } | |
608 | } | |
609 | ||
7b6cd1ce | 610 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 611 | out: |
c07b68e8 | 612 | spin_unlock(&ptype_lock); |
1da177e4 | 613 | } |
d1b19dff ED |
614 | EXPORT_SYMBOL(__dev_remove_pack); |
615 | ||
1da177e4 LT |
616 | /** |
617 | * dev_remove_pack - remove packet handler | |
618 | * @pt: packet type declaration | |
619 | * | |
620 | * Remove a protocol handler that was previously added to the kernel | |
621 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
622 | * from the kernel lists and can be freed or reused once this function | |
623 | * returns. | |
624 | * | |
625 | * This call sleeps to guarantee that no CPU is looking at the packet | |
626 | * type after return. | |
627 | */ | |
628 | void dev_remove_pack(struct packet_type *pt) | |
629 | { | |
630 | __dev_remove_pack(pt); | |
4ec93edb | 631 | |
1da177e4 LT |
632 | synchronize_net(); |
633 | } | |
d1b19dff | 634 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 635 | |
62532da9 | 636 | |
1da177e4 | 637 | /******************************************************************************* |
eb13da1a | 638 | * |
639 | * Device Interface Subroutines | |
640 | * | |
641 | *******************************************************************************/ | |
1da177e4 | 642 | |
a54acb3a ND |
643 | /** |
644 | * dev_get_iflink - get 'iflink' value of a interface | |
645 | * @dev: targeted interface | |
646 | * | |
647 | * Indicates the ifindex the interface is linked to. | |
648 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
649 | */ | |
650 | ||
651 | int dev_get_iflink(const struct net_device *dev) | |
652 | { | |
653 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
654 | return dev->netdev_ops->ndo_get_iflink(dev); | |
655 | ||
7a66bbc9 | 656 | return dev->ifindex; |
a54acb3a ND |
657 | } |
658 | EXPORT_SYMBOL(dev_get_iflink); | |
659 | ||
fc4099f1 PS |
660 | /** |
661 | * dev_fill_metadata_dst - Retrieve tunnel egress information. | |
662 | * @dev: targeted interface | |
663 | * @skb: The packet. | |
664 | * | |
665 | * For better visibility of tunnel traffic OVS needs to retrieve | |
666 | * egress tunnel information for a packet. Following API allows | |
667 | * user to get this info. | |
668 | */ | |
669 | int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
670 | { | |
671 | struct ip_tunnel_info *info; | |
672 | ||
673 | if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) | |
674 | return -EINVAL; | |
675 | ||
676 | info = skb_tunnel_info_unclone(skb); | |
677 | if (!info) | |
678 | return -ENOMEM; | |
679 | if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) | |
680 | return -EINVAL; | |
681 | ||
682 | return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); | |
685 | ||
ddb94eaf PNA |
686 | static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack) |
687 | { | |
688 | int k = stack->num_paths++; | |
689 | ||
690 | if (WARN_ON_ONCE(k >= NET_DEVICE_PATH_STACK_MAX)) | |
691 | return NULL; | |
692 | ||
693 | return &stack->path[k]; | |
694 | } | |
695 | ||
696 | int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, | |
697 | struct net_device_path_stack *stack) | |
698 | { | |
699 | const struct net_device *last_dev; | |
700 | struct net_device_path_ctx ctx = { | |
701 | .dev = dev, | |
ddb94eaf PNA |
702 | }; |
703 | struct net_device_path *path; | |
704 | int ret = 0; | |
705 | ||
cf2df74e | 706 | memcpy(ctx.daddr, daddr, sizeof(ctx.daddr)); |
ddb94eaf PNA |
707 | stack->num_paths = 0; |
708 | while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) { | |
709 | last_dev = ctx.dev; | |
710 | path = dev_fwd_path(stack); | |
711 | if (!path) | |
712 | return -1; | |
713 | ||
714 | memset(path, 0, sizeof(struct net_device_path)); | |
715 | ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path); | |
716 | if (ret < 0) | |
717 | return -1; | |
718 | ||
719 | if (WARN_ON_ONCE(last_dev == ctx.dev)) | |
720 | return -1; | |
721 | } | |
a333215e FF |
722 | |
723 | if (!ctx.dev) | |
724 | return ret; | |
725 | ||
ddb94eaf PNA |
726 | path = dev_fwd_path(stack); |
727 | if (!path) | |
728 | return -1; | |
729 | path->type = DEV_PATH_ETHERNET; | |
730 | path->dev = ctx.dev; | |
731 | ||
732 | return ret; | |
733 | } | |
734 | EXPORT_SYMBOL_GPL(dev_fill_forward_path); | |
735 | ||
1da177e4 LT |
736 | /** |
737 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 738 | * @net: the applicable net namespace |
1da177e4 LT |
739 | * @name: name to find |
740 | * | |
741 | * Find an interface by name. Must be called under RTNL semaphore | |
742 | * or @dev_base_lock. If the name is found a pointer to the device | |
743 | * is returned. If the name is not found then %NULL is returned. The | |
744 | * reference counters are not incremented so the caller must be | |
745 | * careful with locks. | |
746 | */ | |
747 | ||
881d966b | 748 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 749 | { |
ff927412 | 750 | struct netdev_name_node *node_name; |
1da177e4 | 751 | |
ff927412 JP |
752 | node_name = netdev_name_node_lookup(net, name); |
753 | return node_name ? node_name->dev : NULL; | |
1da177e4 | 754 | } |
d1b19dff | 755 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 756 | |
72c9528b | 757 | /** |
722c9a0c | 758 | * dev_get_by_name_rcu - find a device by its name |
759 | * @net: the applicable net namespace | |
760 | * @name: name to find | |
761 | * | |
762 | * Find an interface by name. | |
763 | * If the name is found a pointer to the device is returned. | |
764 | * If the name is not found then %NULL is returned. | |
765 | * The reference counters are not incremented so the caller must be | |
766 | * careful with locks. The caller must hold RCU lock. | |
72c9528b ED |
767 | */ |
768 | ||
769 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
770 | { | |
ff927412 | 771 | struct netdev_name_node *node_name; |
72c9528b | 772 | |
ff927412 JP |
773 | node_name = netdev_name_node_lookup_rcu(net, name); |
774 | return node_name ? node_name->dev : NULL; | |
72c9528b ED |
775 | } |
776 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
777 | ||
70f7457a JK |
778 | /* Deprecated for new users, call netdev_get_by_name() instead */ |
779 | struct net_device *dev_get_by_name(struct net *net, const char *name) | |
780 | { | |
781 | struct net_device *dev; | |
782 | ||
783 | rcu_read_lock(); | |
784 | dev = dev_get_by_name_rcu(net, name); | |
785 | dev_hold(dev); | |
786 | rcu_read_unlock(); | |
787 | return dev; | |
788 | } | |
789 | EXPORT_SYMBOL(dev_get_by_name); | |
790 | ||
1da177e4 | 791 | /** |
70f7457a | 792 | * netdev_get_by_name() - find a device by its name |
c4ea43c5 | 793 | * @net: the applicable net namespace |
1da177e4 | 794 | * @name: name to find |
70f7457a JK |
795 | * @tracker: tracking object for the acquired reference |
796 | * @gfp: allocation flags for the tracker | |
1da177e4 LT |
797 | * |
798 | * Find an interface by name. This can be called from any | |
799 | * context and does its own locking. The returned handle has | |
70f7457a | 800 | * the usage count incremented and the caller must use netdev_put() to |
1da177e4 LT |
801 | * release it when it is no longer needed. %NULL is returned if no |
802 | * matching device is found. | |
803 | */ | |
70f7457a JK |
804 | struct net_device *netdev_get_by_name(struct net *net, const char *name, |
805 | netdevice_tracker *tracker, gfp_t gfp) | |
1da177e4 LT |
806 | { |
807 | struct net_device *dev; | |
808 | ||
70f7457a JK |
809 | dev = dev_get_by_name(net, name); |
810 | if (dev) | |
811 | netdev_tracker_alloc(dev, tracker, gfp); | |
1da177e4 LT |
812 | return dev; |
813 | } | |
70f7457a | 814 | EXPORT_SYMBOL(netdev_get_by_name); |
1da177e4 LT |
815 | |
816 | /** | |
817 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 818 | * @net: the applicable net namespace |
1da177e4 LT |
819 | * @ifindex: index of device |
820 | * | |
821 | * Search for an interface by index. Returns %NULL if the device | |
822 | * is not found or a pointer to the device. The device has not | |
823 | * had its reference counter increased so the caller must be careful | |
824 | * about locking. The caller must hold either the RTNL semaphore | |
825 | * or @dev_base_lock. | |
826 | */ | |
827 | ||
881d966b | 828 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 829 | { |
0bd8d536 ED |
830 | struct net_device *dev; |
831 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 832 | |
b67bfe0d | 833 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
834 | if (dev->ifindex == ifindex) |
835 | return dev; | |
0bd8d536 | 836 | |
1da177e4 LT |
837 | return NULL; |
838 | } | |
d1b19dff | 839 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 840 | |
fb699dfd ED |
841 | /** |
842 | * dev_get_by_index_rcu - find a device by its ifindex | |
843 | * @net: the applicable net namespace | |
844 | * @ifindex: index of device | |
845 | * | |
846 | * Search for an interface by index. Returns %NULL if the device | |
847 | * is not found or a pointer to the device. The device has not | |
848 | * had its reference counter increased so the caller must be careful | |
849 | * about locking. The caller must hold RCU lock. | |
850 | */ | |
851 | ||
852 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
853 | { | |
fb699dfd ED |
854 | struct net_device *dev; |
855 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
856 | ||
b67bfe0d | 857 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
858 | if (dev->ifindex == ifindex) |
859 | return dev; | |
860 | ||
861 | return NULL; | |
862 | } | |
863 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
864 | ||
70f7457a JK |
865 | /* Deprecated for new users, call netdev_get_by_index() instead */ |
866 | struct net_device *dev_get_by_index(struct net *net, int ifindex) | |
867 | { | |
868 | struct net_device *dev; | |
869 | ||
870 | rcu_read_lock(); | |
871 | dev = dev_get_by_index_rcu(net, ifindex); | |
872 | dev_hold(dev); | |
873 | rcu_read_unlock(); | |
874 | return dev; | |
875 | } | |
876 | EXPORT_SYMBOL(dev_get_by_index); | |
1da177e4 LT |
877 | |
878 | /** | |
70f7457a | 879 | * netdev_get_by_index() - find a device by its ifindex |
c4ea43c5 | 880 | * @net: the applicable net namespace |
1da177e4 | 881 | * @ifindex: index of device |
70f7457a JK |
882 | * @tracker: tracking object for the acquired reference |
883 | * @gfp: allocation flags for the tracker | |
1da177e4 LT |
884 | * |
885 | * Search for an interface by index. Returns NULL if the device | |
886 | * is not found or a pointer to the device. The device returned has | |
887 | * had a reference added and the pointer is safe until the user calls | |
70f7457a | 888 | * netdev_put() to indicate they have finished with it. |
1da177e4 | 889 | */ |
70f7457a JK |
890 | struct net_device *netdev_get_by_index(struct net *net, int ifindex, |
891 | netdevice_tracker *tracker, gfp_t gfp) | |
1da177e4 LT |
892 | { |
893 | struct net_device *dev; | |
894 | ||
70f7457a JK |
895 | dev = dev_get_by_index(net, ifindex); |
896 | if (dev) | |
897 | netdev_tracker_alloc(dev, tracker, gfp); | |
1da177e4 LT |
898 | return dev; |
899 | } | |
70f7457a | 900 | EXPORT_SYMBOL(netdev_get_by_index); |
1da177e4 | 901 | |
90b602f8 ML |
902 | /** |
903 | * dev_get_by_napi_id - find a device by napi_id | |
904 | * @napi_id: ID of the NAPI struct | |
905 | * | |
906 | * Search for an interface by NAPI ID. Returns %NULL if the device | |
907 | * is not found or a pointer to the device. The device has not had | |
908 | * its reference counter increased so the caller must be careful | |
909 | * about locking. The caller must hold RCU lock. | |
910 | */ | |
911 | ||
912 | struct net_device *dev_get_by_napi_id(unsigned int napi_id) | |
913 | { | |
914 | struct napi_struct *napi; | |
915 | ||
916 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
917 | ||
918 | if (napi_id < MIN_NAPI_ID) | |
919 | return NULL; | |
920 | ||
921 | napi = napi_by_id(napi_id); | |
922 | ||
923 | return napi ? napi->dev : NULL; | |
924 | } | |
925 | EXPORT_SYMBOL(dev_get_by_napi_id); | |
926 | ||
5dbe7c17 NS |
927 | /** |
928 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
929 | * @net: network namespace | |
930 | * @name: a pointer to the buffer where the name will be stored. | |
931 | * @ifindex: the ifindex of the interface to get the name from. | |
5dbe7c17 NS |
932 | */ |
933 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
934 | { | |
935 | struct net_device *dev; | |
11d6011c | 936 | int ret; |
5dbe7c17 | 937 | |
11d6011c | 938 | down_read(&devnet_rename_sem); |
5dbe7c17 | 939 | rcu_read_lock(); |
11d6011c | 940 | |
5dbe7c17 NS |
941 | dev = dev_get_by_index_rcu(net, ifindex); |
942 | if (!dev) { | |
11d6011c AD |
943 | ret = -ENODEV; |
944 | goto out; | |
5dbe7c17 NS |
945 | } |
946 | ||
947 | strcpy(name, dev->name); | |
5dbe7c17 | 948 | |
11d6011c AD |
949 | ret = 0; |
950 | out: | |
951 | rcu_read_unlock(); | |
952 | up_read(&devnet_rename_sem); | |
953 | return ret; | |
5dbe7c17 NS |
954 | } |
955 | ||
1da177e4 | 956 | /** |
941666c2 | 957 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 958 | * @net: the applicable net namespace |
1da177e4 LT |
959 | * @type: media type of device |
960 | * @ha: hardware address | |
961 | * | |
962 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
963 | * is not found or a pointer to the device. |
964 | * The caller must hold RCU or RTNL. | |
941666c2 | 965 | * The returned device has not had its ref count increased |
1da177e4 LT |
966 | * and the caller must therefore be careful about locking |
967 | * | |
1da177e4 LT |
968 | */ |
969 | ||
941666c2 ED |
970 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
971 | const char *ha) | |
1da177e4 LT |
972 | { |
973 | struct net_device *dev; | |
974 | ||
941666c2 | 975 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
976 | if (dev->type == type && |
977 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
978 | return dev; |
979 | ||
980 | return NULL; | |
1da177e4 | 981 | } |
941666c2 | 982 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 983 | |
881d966b | 984 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 985 | { |
99fe3c39 | 986 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 987 | |
99fe3c39 ED |
988 | rcu_read_lock(); |
989 | for_each_netdev_rcu(net, dev) | |
990 | if (dev->type == type) { | |
991 | dev_hold(dev); | |
992 | ret = dev; | |
993 | break; | |
994 | } | |
995 | rcu_read_unlock(); | |
996 | return ret; | |
1da177e4 | 997 | } |
1da177e4 LT |
998 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
999 | ||
1000 | /** | |
6c555490 | 1001 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 1002 | * @net: the applicable net namespace |
1da177e4 LT |
1003 | * @if_flags: IFF_* values |
1004 | * @mask: bitmask of bits in if_flags to check | |
1005 | * | |
1006 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 1007 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 1008 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
1009 | */ |
1010 | ||
6c555490 WC |
1011 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
1012 | unsigned short mask) | |
1da177e4 | 1013 | { |
7562f876 | 1014 | struct net_device *dev, *ret; |
1da177e4 | 1015 | |
6c555490 WC |
1016 | ASSERT_RTNL(); |
1017 | ||
7562f876 | 1018 | ret = NULL; |
6c555490 | 1019 | for_each_netdev(net, dev) { |
1da177e4 | 1020 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 1021 | ret = dev; |
1da177e4 LT |
1022 | break; |
1023 | } | |
1024 | } | |
7562f876 | 1025 | return ret; |
1da177e4 | 1026 | } |
6c555490 | 1027 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
1028 | |
1029 | /** | |
1030 | * dev_valid_name - check if name is okay for network device | |
1031 | * @name: name string | |
1032 | * | |
1033 | * Network device names need to be valid file names to | |
4250b75b | 1034 | * allow sysfs to work. We also disallow any kind of |
c7fa9d18 | 1035 | * whitespace. |
1da177e4 | 1036 | */ |
95f050bf | 1037 | bool dev_valid_name(const char *name) |
1da177e4 | 1038 | { |
c7fa9d18 | 1039 | if (*name == '\0') |
95f050bf | 1040 | return false; |
a9d48205 | 1041 | if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) |
95f050bf | 1042 | return false; |
c7fa9d18 | 1043 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 1044 | return false; |
c7fa9d18 DM |
1045 | |
1046 | while (*name) { | |
a4176a93 | 1047 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 1048 | return false; |
c7fa9d18 DM |
1049 | name++; |
1050 | } | |
95f050bf | 1051 | return true; |
1da177e4 | 1052 | } |
d1b19dff | 1053 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
1054 | |
1055 | /** | |
b267b179 EB |
1056 | * __dev_alloc_name - allocate a name for a device |
1057 | * @net: network namespace to allocate the device name in | |
1da177e4 | 1058 | * @name: name format string |
bd07063d | 1059 | * @res: result name string |
1da177e4 LT |
1060 | * |
1061 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
1062 | * id. It scans list of devices to build up a free map, then chooses |
1063 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1064 | * while allocating the name and adding the device in order to avoid | |
1065 | * duplicates. | |
1066 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1067 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
1068 | */ |
1069 | ||
bd07063d | 1070 | static int __dev_alloc_name(struct net *net, const char *name, char *res) |
1da177e4 LT |
1071 | { |
1072 | int i = 0; | |
1da177e4 LT |
1073 | const char *p; |
1074 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 1075 | unsigned long *inuse; |
1da177e4 | 1076 | struct net_device *d; |
bd07063d | 1077 | char buf[IFNAMSIZ]; |
1da177e4 | 1078 | |
9a810468 JK |
1079 | /* Verify the string as this thing may have come from the user. |
1080 | * There must be one "%d" and no other "%" characters. | |
1081 | */ | |
51f299dd | 1082 | p = strchr(name, '%'); |
9a810468 JK |
1083 | if (!p || p[1] != 'd' || strchr(p + 2, '%')) |
1084 | return -EINVAL; | |
1085 | ||
1086 | /* Use one page as a bit array of possible slots */ | |
1087 | inuse = bitmap_zalloc(max_netdevices, GFP_ATOMIC); | |
1088 | if (!inuse) | |
1089 | return -ENOMEM; | |
1090 | ||
1091 | for_each_netdev(net, d) { | |
1092 | struct netdev_name_node *name_node; | |
1093 | ||
1094 | netdev_for_each_altname(d, name_node) { | |
1095 | if (!sscanf(name_node->name, name, &i)) | |
1da177e4 LT |
1096 | continue; |
1097 | if (i < 0 || i >= max_netdevices) | |
1098 | continue; | |
1099 | ||
9a810468 | 1100 | /* avoid cases where sscanf is not exact inverse of printf */ |
b267b179 | 1101 | snprintf(buf, IFNAMSIZ, name, i); |
9a810468 | 1102 | if (!strncmp(buf, name_node->name, IFNAMSIZ)) |
25ee1660 | 1103 | __set_bit(i, inuse); |
1da177e4 | 1104 | } |
9a810468 JK |
1105 | if (!sscanf(d->name, name, &i)) |
1106 | continue; | |
1107 | if (i < 0 || i >= max_netdevices) | |
1108 | continue; | |
1109 | ||
1110 | /* avoid cases where sscanf is not exact inverse of printf */ | |
1111 | snprintf(buf, IFNAMSIZ, name, i); | |
1112 | if (!strncmp(buf, d->name, IFNAMSIZ)) | |
1113 | __set_bit(i, inuse); | |
1da177e4 LT |
1114 | } |
1115 | ||
9a810468 JK |
1116 | i = find_first_zero_bit(inuse, max_netdevices); |
1117 | bitmap_free(inuse); | |
7ad17b04 JK |
1118 | if (i == max_netdevices) |
1119 | return -ENFILE; | |
9a810468 | 1120 | |
674e3180 GP |
1121 | /* 'res' and 'name' could overlap, use 'buf' as an intermediate buffer */ |
1122 | strscpy(buf, name, IFNAMSIZ); | |
1123 | snprintf(res, IFNAMSIZ, buf, i); | |
7ad17b04 | 1124 | return i; |
1da177e4 LT |
1125 | } |
1126 | ||
556c755a | 1127 | /* Returns negative errno or allocated unit id (see __dev_alloc_name()) */ |
311cca40 | 1128 | static int dev_prep_valid_name(struct net *net, struct net_device *dev, |
556c755a JK |
1129 | const char *want_name, char *out_name, |
1130 | int dup_errno) | |
311cca40 | 1131 | { |
311cca40 JK |
1132 | if (!dev_valid_name(want_name)) |
1133 | return -EINVAL; | |
1134 | ||
ce4cfa23 | 1135 | if (strchr(want_name, '%')) |
556c755a | 1136 | return __dev_alloc_name(net, want_name, out_name); |
ce4cfa23 JK |
1137 | |
1138 | if (netdev_name_in_use(net, want_name)) | |
556c755a | 1139 | return -dup_errno; |
ce4cfa23 | 1140 | if (out_name != want_name) |
311cca40 | 1141 | strscpy(out_name, want_name, IFNAMSIZ); |
311cca40 JK |
1142 | return 0; |
1143 | } | |
1144 | ||
b267b179 EB |
1145 | /** |
1146 | * dev_alloc_name - allocate a name for a device | |
1147 | * @dev: device | |
1148 | * @name: name format string | |
1149 | * | |
1150 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1151 | * id. It scans list of devices to build up a free map, then chooses | |
1152 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1153 | * while allocating the name and adding the device in order to avoid | |
1154 | * duplicates. | |
1155 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1156 | * Returns the number of the unit assigned or a negative errno code. | |
1157 | */ | |
1158 | ||
1159 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1160 | { | |
556c755a | 1161 | return dev_prep_valid_name(dev_net(dev), dev, name, dev->name, ENFILE); |
b267b179 | 1162 | } |
d1b19dff | 1163 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1164 | |
bacb7e18 ED |
1165 | static int dev_get_valid_name(struct net *net, struct net_device *dev, |
1166 | const char *name) | |
828de4f6 | 1167 | { |
556c755a JK |
1168 | int ret; |
1169 | ||
1170 | ret = dev_prep_valid_name(net, dev, name, dev->name, EEXIST); | |
1171 | return ret < 0 ? ret : 0; | |
d9031024 | 1172 | } |
1da177e4 LT |
1173 | |
1174 | /** | |
1175 | * dev_change_name - change name of a device | |
1176 | * @dev: device | |
1177 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1178 | * | |
1179 | * Change name of a device, can pass format strings "eth%d". | |
1180 | * for wildcarding. | |
1181 | */ | |
cf04a4c7 | 1182 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1183 | { |
238fa362 | 1184 | unsigned char old_assign_type; |
fcc5a03a | 1185 | char oldname[IFNAMSIZ]; |
1da177e4 | 1186 | int err = 0; |
fcc5a03a | 1187 | int ret; |
881d966b | 1188 | struct net *net; |
1da177e4 LT |
1189 | |
1190 | ASSERT_RTNL(); | |
c346dca1 | 1191 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1192 | |
c346dca1 | 1193 | net = dev_net(dev); |
8065a779 | 1194 | |
11d6011c | 1195 | down_write(&devnet_rename_sem); |
c91f6df2 BH |
1196 | |
1197 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
11d6011c | 1198 | up_write(&devnet_rename_sem); |
c8d90dca | 1199 | return 0; |
c91f6df2 | 1200 | } |
c8d90dca | 1201 | |
fcc5a03a HX |
1202 | memcpy(oldname, dev->name, IFNAMSIZ); |
1203 | ||
828de4f6 | 1204 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1205 | if (err < 0) { |
11d6011c | 1206 | up_write(&devnet_rename_sem); |
d9031024 | 1207 | return err; |
c91f6df2 | 1208 | } |
1da177e4 | 1209 | |
6fe82a39 | 1210 | if (oldname[0] && !strchr(oldname, '%')) |
bd039b5e AR |
1211 | netdev_info(dev, "renamed from %s%s\n", oldname, |
1212 | dev->flags & IFF_UP ? " (while UP)" : ""); | |
6fe82a39 | 1213 | |
238fa362 TG |
1214 | old_assign_type = dev->name_assign_type; |
1215 | dev->name_assign_type = NET_NAME_RENAMED; | |
1216 | ||
fcc5a03a | 1217 | rollback: |
a1b3f594 EB |
1218 | ret = device_rename(&dev->dev, dev->name); |
1219 | if (ret) { | |
1220 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1221 | dev->name_assign_type = old_assign_type; |
11d6011c | 1222 | up_write(&devnet_rename_sem); |
a1b3f594 | 1223 | return ret; |
dcc99773 | 1224 | } |
7f988eab | 1225 | |
11d6011c | 1226 | up_write(&devnet_rename_sem); |
c91f6df2 | 1227 | |
5bb025fa VF |
1228 | netdev_adjacent_rename_links(dev, oldname); |
1229 | ||
fd888e85 | 1230 | write_lock(&dev_base_lock); |
ff927412 | 1231 | netdev_name_node_del(dev->name_node); |
fd888e85 | 1232 | write_unlock(&dev_base_lock); |
72c9528b ED |
1233 | |
1234 | synchronize_rcu(); | |
1235 | ||
fd888e85 | 1236 | write_lock(&dev_base_lock); |
ff927412 | 1237 | netdev_name_node_add(net, dev->name_node); |
fd888e85 | 1238 | write_unlock(&dev_base_lock); |
7f988eab | 1239 | |
056925ab | 1240 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1241 | ret = notifier_to_errno(ret); |
1242 | ||
1243 | if (ret) { | |
91e9c07b ED |
1244 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1245 | if (err >= 0) { | |
fcc5a03a | 1246 | err = ret; |
11d6011c | 1247 | down_write(&devnet_rename_sem); |
fcc5a03a | 1248 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1249 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1250 | dev->name_assign_type = old_assign_type; |
1251 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1252 | goto rollback; |
91e9c07b | 1253 | } else { |
5b92be64 JB |
1254 | netdev_err(dev, "name change rollback failed: %d\n", |
1255 | ret); | |
fcc5a03a HX |
1256 | } |
1257 | } | |
1da177e4 LT |
1258 | |
1259 | return err; | |
1260 | } | |
1261 | ||
0b815a1a SH |
1262 | /** |
1263 | * dev_set_alias - change ifalias of a device | |
1264 | * @dev: device | |
1265 | * @alias: name up to IFALIASZ | |
f0db275a | 1266 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1267 | * |
1268 | * Set ifalias for a device, | |
1269 | */ | |
1270 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1271 | { | |
6c557001 | 1272 | struct dev_ifalias *new_alias = NULL; |
0b815a1a SH |
1273 | |
1274 | if (len >= IFALIASZ) | |
1275 | return -EINVAL; | |
1276 | ||
6c557001 FW |
1277 | if (len) { |
1278 | new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); | |
1279 | if (!new_alias) | |
1280 | return -ENOMEM; | |
1281 | ||
1282 | memcpy(new_alias->ifalias, alias, len); | |
1283 | new_alias->ifalias[len] = 0; | |
96ca4a2c OH |
1284 | } |
1285 | ||
6c557001 | 1286 | mutex_lock(&ifalias_mutex); |
e3f0d761 PM |
1287 | new_alias = rcu_replace_pointer(dev->ifalias, new_alias, |
1288 | mutex_is_locked(&ifalias_mutex)); | |
6c557001 FW |
1289 | mutex_unlock(&ifalias_mutex); |
1290 | ||
1291 | if (new_alias) | |
1292 | kfree_rcu(new_alias, rcuhead); | |
0b815a1a | 1293 | |
0b815a1a SH |
1294 | return len; |
1295 | } | |
0fe554a4 | 1296 | EXPORT_SYMBOL(dev_set_alias); |
0b815a1a | 1297 | |
6c557001 FW |
1298 | /** |
1299 | * dev_get_alias - get ifalias of a device | |
1300 | * @dev: device | |
20e88320 | 1301 | * @name: buffer to store name of ifalias |
6c557001 FW |
1302 | * @len: size of buffer |
1303 | * | |
1304 | * get ifalias for a device. Caller must make sure dev cannot go | |
1305 | * away, e.g. rcu read lock or own a reference count to device. | |
1306 | */ | |
1307 | int dev_get_alias(const struct net_device *dev, char *name, size_t len) | |
1308 | { | |
1309 | const struct dev_ifalias *alias; | |
1310 | int ret = 0; | |
1311 | ||
1312 | rcu_read_lock(); | |
1313 | alias = rcu_dereference(dev->ifalias); | |
1314 | if (alias) | |
1315 | ret = snprintf(name, len, "%s", alias->ifalias); | |
1316 | rcu_read_unlock(); | |
1317 | ||
1318 | return ret; | |
1319 | } | |
0b815a1a | 1320 | |
d8a33ac4 | 1321 | /** |
3041a069 | 1322 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1323 | * @dev: device to cause notification |
1324 | * | |
1325 | * Called to indicate a device has changed features. | |
1326 | */ | |
1327 | void netdev_features_change(struct net_device *dev) | |
1328 | { | |
056925ab | 1329 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1330 | } |
1331 | EXPORT_SYMBOL(netdev_features_change); | |
1332 | ||
1da177e4 LT |
1333 | /** |
1334 | * netdev_state_change - device changes state | |
1335 | * @dev: device to cause notification | |
1336 | * | |
1337 | * Called to indicate a device has changed state. This function calls | |
1338 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1339 | * to the routing socket. | |
1340 | */ | |
1341 | void netdev_state_change(struct net_device *dev) | |
1342 | { | |
1343 | if (dev->flags & IFF_UP) { | |
51d0c047 DA |
1344 | struct netdev_notifier_change_info change_info = { |
1345 | .info.dev = dev, | |
1346 | }; | |
54951194 | 1347 | |
51d0c047 | 1348 | call_netdevice_notifiers_info(NETDEV_CHANGE, |
54951194 | 1349 | &change_info.info); |
1d997f10 | 1350 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL, 0, NULL); |
1da177e4 LT |
1351 | } |
1352 | } | |
d1b19dff | 1353 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1354 | |
7061eb8c LP |
1355 | /** |
1356 | * __netdev_notify_peers - notify network peers about existence of @dev, | |
1357 | * to be called when rtnl lock is already held. | |
1358 | * @dev: network device | |
1359 | * | |
1360 | * Generate traffic such that interested network peers are aware of | |
1361 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1362 | * a device wants to inform the rest of the network about some sort of | |
1363 | * reconfiguration such as a failover event or virtual machine | |
1364 | * migration. | |
1365 | */ | |
1366 | void __netdev_notify_peers(struct net_device *dev) | |
1367 | { | |
1368 | ASSERT_RTNL(); | |
1369 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
1370 | call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); | |
1371 | } | |
1372 | EXPORT_SYMBOL(__netdev_notify_peers); | |
1373 | ||
ee89bab1 | 1374 | /** |
722c9a0c | 1375 | * netdev_notify_peers - notify network peers about existence of @dev |
1376 | * @dev: network device | |
ee89bab1 AW |
1377 | * |
1378 | * Generate traffic such that interested network peers are aware of | |
1379 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1380 | * a device wants to inform the rest of the network about some sort of | |
1381 | * reconfiguration such as a failover event or virtual machine | |
1382 | * migration. | |
1383 | */ | |
1384 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1385 | { |
ee89bab1 | 1386 | rtnl_lock(); |
7061eb8c | 1387 | __netdev_notify_peers(dev); |
ee89bab1 | 1388 | rtnl_unlock(); |
c1da4ac7 | 1389 | } |
ee89bab1 | 1390 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1391 | |
29863d41 WW |
1392 | static int napi_threaded_poll(void *data); |
1393 | ||
1394 | static int napi_kthread_create(struct napi_struct *n) | |
1395 | { | |
1396 | int err = 0; | |
1397 | ||
1398 | /* Create and wake up the kthread once to put it in | |
1399 | * TASK_INTERRUPTIBLE mode to avoid the blocked task | |
1400 | * warning and work with loadavg. | |
1401 | */ | |
1402 | n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d", | |
1403 | n->dev->name, n->napi_id); | |
1404 | if (IS_ERR(n->thread)) { | |
1405 | err = PTR_ERR(n->thread); | |
1406 | pr_err("kthread_run failed with err %d\n", err); | |
1407 | n->thread = NULL; | |
1408 | } | |
1409 | ||
1410 | return err; | |
1411 | } | |
1412 | ||
40c900aa | 1413 | static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
1da177e4 | 1414 | { |
d314774c | 1415 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1416 | int ret; |
1da177e4 | 1417 | |
e46b66bc | 1418 | ASSERT_RTNL(); |
d07b26f5 | 1419 | dev_addr_check(dev); |
e46b66bc | 1420 | |
bd869245 HK |
1421 | if (!netif_device_present(dev)) { |
1422 | /* may be detached because parent is runtime-suspended */ | |
1423 | if (dev->dev.parent) | |
1424 | pm_runtime_resume(dev->dev.parent); | |
1425 | if (!netif_device_present(dev)) | |
1426 | return -ENODEV; | |
1427 | } | |
1da177e4 | 1428 | |
ca99ca14 NH |
1429 | /* Block netpoll from trying to do any rx path servicing. |
1430 | * If we don't do this there is a chance ndo_poll_controller | |
1431 | * or ndo_poll may be running while we open the device | |
1432 | */ | |
66b5552f | 1433 | netpoll_poll_disable(dev); |
ca99ca14 | 1434 | |
40c900aa | 1435 | ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack); |
3b8bcfd5 JB |
1436 | ret = notifier_to_errno(ret); |
1437 | if (ret) | |
1438 | return ret; | |
1439 | ||
1da177e4 | 1440 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1441 | |
d314774c SH |
1442 | if (ops->ndo_validate_addr) |
1443 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1444 | |
d314774c SH |
1445 | if (!ret && ops->ndo_open) |
1446 | ret = ops->ndo_open(dev); | |
1da177e4 | 1447 | |
66b5552f | 1448 | netpoll_poll_enable(dev); |
ca99ca14 | 1449 | |
bada339b JG |
1450 | if (ret) |
1451 | clear_bit(__LINK_STATE_START, &dev->state); | |
1452 | else { | |
1da177e4 | 1453 | dev->flags |= IFF_UP; |
4417da66 | 1454 | dev_set_rx_mode(dev); |
1da177e4 | 1455 | dev_activate(dev); |
7bf23575 | 1456 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1457 | } |
bada339b | 1458 | |
1da177e4 LT |
1459 | return ret; |
1460 | } | |
1461 | ||
1462 | /** | |
bd380811 | 1463 | * dev_open - prepare an interface for use. |
00f54e68 PM |
1464 | * @dev: device to open |
1465 | * @extack: netlink extended ack | |
1da177e4 | 1466 | * |
bd380811 PM |
1467 | * Takes a device from down to up state. The device's private open |
1468 | * function is invoked and then the multicast lists are loaded. Finally | |
1469 | * the device is moved into the up state and a %NETDEV_UP message is | |
1470 | * sent to the netdev notifier chain. | |
1471 | * | |
1472 | * Calling this function on an active interface is a nop. On a failure | |
1473 | * a negative errno code is returned. | |
1da177e4 | 1474 | */ |
00f54e68 | 1475 | int dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
bd380811 PM |
1476 | { |
1477 | int ret; | |
1478 | ||
bd380811 PM |
1479 | if (dev->flags & IFF_UP) |
1480 | return 0; | |
1481 | ||
40c900aa | 1482 | ret = __dev_open(dev, extack); |
bd380811 PM |
1483 | if (ret < 0) |
1484 | return ret; | |
1485 | ||
1d997f10 | 1486 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP | IFF_RUNNING, GFP_KERNEL, 0, NULL); |
bd380811 PM |
1487 | call_netdevice_notifiers(NETDEV_UP, dev); |
1488 | ||
1489 | return ret; | |
1490 | } | |
1491 | EXPORT_SYMBOL(dev_open); | |
1492 | ||
7051b88a | 1493 | static void __dev_close_many(struct list_head *head) |
1da177e4 | 1494 | { |
44345724 | 1495 | struct net_device *dev; |
e46b66bc | 1496 | |
bd380811 | 1497 | ASSERT_RTNL(); |
9d5010db DM |
1498 | might_sleep(); |
1499 | ||
5cde2829 | 1500 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1501 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1502 | netpoll_poll_disable(dev); |
3f4df206 | 1503 | |
44345724 | 1504 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1505 | |
44345724 | 1506 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1507 | |
44345724 OP |
1508 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1509 | * can be even on different cpu. So just clear netif_running(). | |
1510 | * | |
1511 | * dev->stop() will invoke napi_disable() on all of it's | |
1512 | * napi_struct instances on this device. | |
1513 | */ | |
4e857c58 | 1514 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1515 | } |
1da177e4 | 1516 | |
44345724 | 1517 | dev_deactivate_many(head); |
d8b2a4d2 | 1518 | |
5cde2829 | 1519 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1520 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1521 | |
44345724 OP |
1522 | /* |
1523 | * Call the device specific close. This cannot fail. | |
1524 | * Only if device is UP | |
1525 | * | |
1526 | * We allow it to be called even after a DETACH hot-plug | |
1527 | * event. | |
1528 | */ | |
1529 | if (ops->ndo_stop) | |
1530 | ops->ndo_stop(dev); | |
1531 | ||
44345724 | 1532 | dev->flags &= ~IFF_UP; |
66b5552f | 1533 | netpoll_poll_enable(dev); |
44345724 | 1534 | } |
44345724 OP |
1535 | } |
1536 | ||
7051b88a | 1537 | static void __dev_close(struct net_device *dev) |
44345724 OP |
1538 | { |
1539 | LIST_HEAD(single); | |
1540 | ||
5cde2829 | 1541 | list_add(&dev->close_list, &single); |
7051b88a | 1542 | __dev_close_many(&single); |
f87e6f47 | 1543 | list_del(&single); |
44345724 OP |
1544 | } |
1545 | ||
7051b88a | 1546 | void dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1547 | { |
1548 | struct net_device *dev, *tmp; | |
1da177e4 | 1549 | |
5cde2829 EB |
1550 | /* Remove the devices that don't need to be closed */ |
1551 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1552 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1553 | list_del_init(&dev->close_list); |
44345724 OP |
1554 | |
1555 | __dev_close_many(head); | |
1da177e4 | 1556 | |
5cde2829 | 1557 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
1d997f10 | 1558 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP | IFF_RUNNING, GFP_KERNEL, 0, NULL); |
44345724 | 1559 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1560 | if (unlink) |
1561 | list_del_init(&dev->close_list); | |
44345724 | 1562 | } |
bd380811 | 1563 | } |
99c4a26a | 1564 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1565 | |
1566 | /** | |
1567 | * dev_close - shutdown an interface. | |
1568 | * @dev: device to shutdown | |
1569 | * | |
1570 | * This function moves an active device into down state. A | |
1571 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1572 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1573 | * chain. | |
1574 | */ | |
7051b88a | 1575 | void dev_close(struct net_device *dev) |
bd380811 | 1576 | { |
e14a5993 ED |
1577 | if (dev->flags & IFF_UP) { |
1578 | LIST_HEAD(single); | |
1da177e4 | 1579 | |
5cde2829 | 1580 | list_add(&dev->close_list, &single); |
99c4a26a | 1581 | dev_close_many(&single, true); |
e14a5993 ED |
1582 | list_del(&single); |
1583 | } | |
1da177e4 | 1584 | } |
d1b19dff | 1585 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1586 | |
1587 | ||
0187bdfb BH |
1588 | /** |
1589 | * dev_disable_lro - disable Large Receive Offload on a device | |
1590 | * @dev: device | |
1591 | * | |
1592 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1593 | * called under RTNL. This is needed if received packets may be | |
1594 | * forwarded to another interface. | |
1595 | */ | |
1596 | void dev_disable_lro(struct net_device *dev) | |
1597 | { | |
fbe168ba MK |
1598 | struct net_device *lower_dev; |
1599 | struct list_head *iter; | |
529d0489 | 1600 | |
bc5787c6 MM |
1601 | dev->wanted_features &= ~NETIF_F_LRO; |
1602 | netdev_update_features(dev); | |
27660515 | 1603 | |
22d5969f MM |
1604 | if (unlikely(dev->features & NETIF_F_LRO)) |
1605 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1606 | |
1607 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1608 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1609 | } |
1610 | EXPORT_SYMBOL(dev_disable_lro); | |
1611 | ||
56f5aa77 MC |
1612 | /** |
1613 | * dev_disable_gro_hw - disable HW Generic Receive Offload on a device | |
1614 | * @dev: device | |
1615 | * | |
1616 | * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be | |
1617 | * called under RTNL. This is needed if Generic XDP is installed on | |
1618 | * the device. | |
1619 | */ | |
1620 | static void dev_disable_gro_hw(struct net_device *dev) | |
1621 | { | |
1622 | dev->wanted_features &= ~NETIF_F_GRO_HW; | |
1623 | netdev_update_features(dev); | |
1624 | ||
1625 | if (unlikely(dev->features & NETIF_F_GRO_HW)) | |
1626 | netdev_WARN(dev, "failed to disable GRO_HW!\n"); | |
1627 | } | |
1628 | ||
ede2762d KT |
1629 | const char *netdev_cmd_to_name(enum netdev_cmd cmd) |
1630 | { | |
1631 | #define N(val) \ | |
1632 | case NETDEV_##val: \ | |
1633 | return "NETDEV_" __stringify(val); | |
1634 | switch (cmd) { | |
1635 | N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) | |
1636 | N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) | |
1637 | N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) | |
02a68a47 JP |
1638 | N(POST_INIT) N(PRE_UNINIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) |
1639 | N(CHANGEUPPER) N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) | |
1640 | N(BONDING_INFO) N(PRECHANGEUPPER) N(CHANGELOWERSTATE) | |
1641 | N(UDP_TUNNEL_PUSH_INFO) N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) | |
9daae9bd GP |
1642 | N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) |
1643 | N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) | |
9309f97a PM |
1644 | N(PRE_CHANGEADDR) N(OFFLOAD_XSTATS_ENABLE) N(OFFLOAD_XSTATS_DISABLE) |
1645 | N(OFFLOAD_XSTATS_REPORT_USED) N(OFFLOAD_XSTATS_REPORT_DELTA) | |
5a178186 | 1646 | N(XDP_FEAT_CHANGE) |
3f5ecd8a | 1647 | } |
ede2762d KT |
1648 | #undef N |
1649 | return "UNKNOWN_NETDEV_EVENT"; | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(netdev_cmd_to_name); | |
1652 | ||
351638e7 JP |
1653 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1654 | struct net_device *dev) | |
1655 | { | |
51d0c047 DA |
1656 | struct netdev_notifier_info info = { |
1657 | .dev = dev, | |
1658 | }; | |
351638e7 | 1659 | |
351638e7 JP |
1660 | return nb->notifier_call(nb, val, &info); |
1661 | } | |
0187bdfb | 1662 | |
afa0df59 JP |
1663 | static int call_netdevice_register_notifiers(struct notifier_block *nb, |
1664 | struct net_device *dev) | |
1665 | { | |
1666 | int err; | |
1667 | ||
1668 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); | |
1669 | err = notifier_to_errno(err); | |
1670 | if (err) | |
1671 | return err; | |
1672 | ||
1673 | if (!(dev->flags & IFF_UP)) | |
1674 | return 0; | |
1675 | ||
1676 | call_netdevice_notifier(nb, NETDEV_UP, dev); | |
1677 | return 0; | |
1678 | } | |
1679 | ||
1680 | static void call_netdevice_unregister_notifiers(struct notifier_block *nb, | |
1681 | struct net_device *dev) | |
1682 | { | |
1683 | if (dev->flags & IFF_UP) { | |
1684 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, | |
1685 | dev); | |
1686 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
1687 | } | |
1688 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); | |
1689 | } | |
1690 | ||
1691 | static int call_netdevice_register_net_notifiers(struct notifier_block *nb, | |
1692 | struct net *net) | |
1693 | { | |
1694 | struct net_device *dev; | |
1695 | int err; | |
1696 | ||
1697 | for_each_netdev(net, dev) { | |
1698 | err = call_netdevice_register_notifiers(nb, dev); | |
1699 | if (err) | |
1700 | goto rollback; | |
1701 | } | |
1702 | return 0; | |
1703 | ||
1704 | rollback: | |
1705 | for_each_netdev_continue_reverse(net, dev) | |
1706 | call_netdevice_unregister_notifiers(nb, dev); | |
1707 | return err; | |
1708 | } | |
1709 | ||
1710 | static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb, | |
1711 | struct net *net) | |
1712 | { | |
1713 | struct net_device *dev; | |
1714 | ||
1715 | for_each_netdev(net, dev) | |
1716 | call_netdevice_unregister_notifiers(nb, dev); | |
1717 | } | |
1718 | ||
881d966b EB |
1719 | static int dev_boot_phase = 1; |
1720 | ||
1da177e4 | 1721 | /** |
722c9a0c | 1722 | * register_netdevice_notifier - register a network notifier block |
1723 | * @nb: notifier | |
1da177e4 | 1724 | * |
722c9a0c | 1725 | * Register a notifier to be called when network device events occur. |
1726 | * The notifier passed is linked into the kernel structures and must | |
1727 | * not be reused until it has been unregistered. A negative errno code | |
1728 | * is returned on a failure. | |
1da177e4 | 1729 | * |
722c9a0c | 1730 | * When registered all registration and up events are replayed |
1731 | * to the new notifier to allow device to have a race free | |
1732 | * view of the network device list. | |
1da177e4 LT |
1733 | */ |
1734 | ||
1735 | int register_netdevice_notifier(struct notifier_block *nb) | |
1736 | { | |
881d966b | 1737 | struct net *net; |
1da177e4 LT |
1738 | int err; |
1739 | ||
328fbe74 KT |
1740 | /* Close race with setup_net() and cleanup_net() */ |
1741 | down_write(&pernet_ops_rwsem); | |
1da177e4 | 1742 | rtnl_lock(); |
f07d5b94 | 1743 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1744 | if (err) |
1745 | goto unlock; | |
881d966b EB |
1746 | if (dev_boot_phase) |
1747 | goto unlock; | |
1748 | for_each_net(net) { | |
afa0df59 JP |
1749 | err = call_netdevice_register_net_notifiers(nb, net); |
1750 | if (err) | |
1751 | goto rollback; | |
1da177e4 | 1752 | } |
fcc5a03a HX |
1753 | |
1754 | unlock: | |
1da177e4 | 1755 | rtnl_unlock(); |
328fbe74 | 1756 | up_write(&pernet_ops_rwsem); |
1da177e4 | 1757 | return err; |
fcc5a03a HX |
1758 | |
1759 | rollback: | |
afa0df59 JP |
1760 | for_each_net_continue_reverse(net) |
1761 | call_netdevice_unregister_net_notifiers(nb, net); | |
c67625a1 PE |
1762 | |
1763 | raw_notifier_chain_unregister(&netdev_chain, nb); | |
fcc5a03a | 1764 | goto unlock; |
1da177e4 | 1765 | } |
d1b19dff | 1766 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1767 | |
1768 | /** | |
722c9a0c | 1769 | * unregister_netdevice_notifier - unregister a network notifier block |
1770 | * @nb: notifier | |
1da177e4 | 1771 | * |
722c9a0c | 1772 | * Unregister a notifier previously registered by |
1773 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1774 | * kernel structures and may then be reused. A negative errno code | |
1775 | * is returned on a failure. | |
7d3d43da | 1776 | * |
722c9a0c | 1777 | * After unregistering unregister and down device events are synthesized |
1778 | * for all devices on the device list to the removed notifier to remove | |
1779 | * the need for special case cleanup code. | |
1da177e4 LT |
1780 | */ |
1781 | ||
1782 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1783 | { | |
7d3d43da | 1784 | struct net *net; |
9f514950 HX |
1785 | int err; |
1786 | ||
328fbe74 KT |
1787 | /* Close race with setup_net() and cleanup_net() */ |
1788 | down_write(&pernet_ops_rwsem); | |
9f514950 | 1789 | rtnl_lock(); |
f07d5b94 | 1790 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1791 | if (err) |
1792 | goto unlock; | |
1793 | ||
48b3a137 JP |
1794 | for_each_net(net) |
1795 | call_netdevice_unregister_net_notifiers(nb, net); | |
1796 | ||
7d3d43da | 1797 | unlock: |
9f514950 | 1798 | rtnl_unlock(); |
328fbe74 | 1799 | up_write(&pernet_ops_rwsem); |
9f514950 | 1800 | return err; |
1da177e4 | 1801 | } |
d1b19dff | 1802 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1803 | |
1f637703 JP |
1804 | static int __register_netdevice_notifier_net(struct net *net, |
1805 | struct notifier_block *nb, | |
1806 | bool ignore_call_fail) | |
1807 | { | |
1808 | int err; | |
1809 | ||
1810 | err = raw_notifier_chain_register(&net->netdev_chain, nb); | |
1811 | if (err) | |
1812 | return err; | |
1813 | if (dev_boot_phase) | |
1814 | return 0; | |
1815 | ||
1816 | err = call_netdevice_register_net_notifiers(nb, net); | |
1817 | if (err && !ignore_call_fail) | |
1818 | goto chain_unregister; | |
1819 | ||
1820 | return 0; | |
1821 | ||
1822 | chain_unregister: | |
1823 | raw_notifier_chain_unregister(&net->netdev_chain, nb); | |
1824 | return err; | |
1825 | } | |
1826 | ||
1827 | static int __unregister_netdevice_notifier_net(struct net *net, | |
1828 | struct notifier_block *nb) | |
1829 | { | |
1830 | int err; | |
1831 | ||
1832 | err = raw_notifier_chain_unregister(&net->netdev_chain, nb); | |
1833 | if (err) | |
1834 | return err; | |
1835 | ||
1836 | call_netdevice_unregister_net_notifiers(nb, net); | |
1837 | return 0; | |
1838 | } | |
1839 | ||
a30c7b42 JP |
1840 | /** |
1841 | * register_netdevice_notifier_net - register a per-netns network notifier block | |
1842 | * @net: network namespace | |
1843 | * @nb: notifier | |
1844 | * | |
1845 | * Register a notifier to be called when network device events occur. | |
1846 | * The notifier passed is linked into the kernel structures and must | |
1847 | * not be reused until it has been unregistered. A negative errno code | |
1848 | * is returned on a failure. | |
1849 | * | |
1850 | * When registered all registration and up events are replayed | |
1851 | * to the new notifier to allow device to have a race free | |
1852 | * view of the network device list. | |
1853 | */ | |
1854 | ||
1855 | int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb) | |
1856 | { | |
1857 | int err; | |
1858 | ||
1859 | rtnl_lock(); | |
1f637703 | 1860 | err = __register_netdevice_notifier_net(net, nb, false); |
a30c7b42 JP |
1861 | rtnl_unlock(); |
1862 | return err; | |
a30c7b42 JP |
1863 | } |
1864 | EXPORT_SYMBOL(register_netdevice_notifier_net); | |
1865 | ||
1866 | /** | |
1867 | * unregister_netdevice_notifier_net - unregister a per-netns | |
1868 | * network notifier block | |
1869 | * @net: network namespace | |
1870 | * @nb: notifier | |
1871 | * | |
1872 | * Unregister a notifier previously registered by | |
9054b41c | 1873 | * register_netdevice_notifier_net(). The notifier is unlinked from the |
a30c7b42 JP |
1874 | * kernel structures and may then be reused. A negative errno code |
1875 | * is returned on a failure. | |
1876 | * | |
1877 | * After unregistering unregister and down device events are synthesized | |
1878 | * for all devices on the device list to the removed notifier to remove | |
1879 | * the need for special case cleanup code. | |
1880 | */ | |
1881 | ||
1882 | int unregister_netdevice_notifier_net(struct net *net, | |
1883 | struct notifier_block *nb) | |
1884 | { | |
1885 | int err; | |
1886 | ||
1887 | rtnl_lock(); | |
1f637703 | 1888 | err = __unregister_netdevice_notifier_net(net, nb); |
a30c7b42 JP |
1889 | rtnl_unlock(); |
1890 | return err; | |
1891 | } | |
1892 | EXPORT_SYMBOL(unregister_netdevice_notifier_net); | |
a30c7b42 | 1893 | |
3e52fba0 JP |
1894 | static void __move_netdevice_notifier_net(struct net *src_net, |
1895 | struct net *dst_net, | |
1896 | struct notifier_block *nb) | |
1897 | { | |
1898 | __unregister_netdevice_notifier_net(src_net, nb); | |
1899 | __register_netdevice_notifier_net(dst_net, nb, true); | |
1900 | } | |
1901 | ||
93642e14 JP |
1902 | int register_netdevice_notifier_dev_net(struct net_device *dev, |
1903 | struct notifier_block *nb, | |
1904 | struct netdev_net_notifier *nn) | |
1905 | { | |
1906 | int err; | |
a30c7b42 | 1907 | |
93642e14 JP |
1908 | rtnl_lock(); |
1909 | err = __register_netdevice_notifier_net(dev_net(dev), nb, false); | |
1910 | if (!err) { | |
1911 | nn->nb = nb; | |
1912 | list_add(&nn->list, &dev->net_notifier_list); | |
1913 | } | |
a30c7b42 JP |
1914 | rtnl_unlock(); |
1915 | return err; | |
1916 | } | |
93642e14 JP |
1917 | EXPORT_SYMBOL(register_netdevice_notifier_dev_net); |
1918 | ||
1919 | int unregister_netdevice_notifier_dev_net(struct net_device *dev, | |
1920 | struct notifier_block *nb, | |
1921 | struct netdev_net_notifier *nn) | |
1922 | { | |
1923 | int err; | |
1924 | ||
1925 | rtnl_lock(); | |
1926 | list_del(&nn->list); | |
1927 | err = __unregister_netdevice_notifier_net(dev_net(dev), nb); | |
1928 | rtnl_unlock(); | |
1929 | return err; | |
1930 | } | |
1931 | EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net); | |
1932 | ||
1933 | static void move_netdevice_notifiers_dev_net(struct net_device *dev, | |
1934 | struct net *net) | |
1935 | { | |
1936 | struct netdev_net_notifier *nn; | |
1937 | ||
3e52fba0 JP |
1938 | list_for_each_entry(nn, &dev->net_notifier_list, list) |
1939 | __move_netdevice_notifier_net(dev_net(dev), net, nn->nb); | |
93642e14 | 1940 | } |
a30c7b42 | 1941 | |
351638e7 JP |
1942 | /** |
1943 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1944 | * @val: value passed unmodified to notifier function | |
351638e7 JP |
1945 | * @info: notifier information data |
1946 | * | |
1947 | * Call all network notifier blocks. Parameters and return value | |
1948 | * are as for raw_notifier_call_chain(). | |
1949 | */ | |
1950 | ||
88c0a6b5 VO |
1951 | int call_netdevice_notifiers_info(unsigned long val, |
1952 | struct netdev_notifier_info *info) | |
351638e7 | 1953 | { |
a30c7b42 JP |
1954 | struct net *net = dev_net(info->dev); |
1955 | int ret; | |
1956 | ||
351638e7 | 1957 | ASSERT_RTNL(); |
a30c7b42 JP |
1958 | |
1959 | /* Run per-netns notifier block chain first, then run the global one. | |
1960 | * Hopefully, one day, the global one is going to be removed after | |
1961 | * all notifier block registrators get converted to be per-netns. | |
1962 | */ | |
1963 | ret = raw_notifier_call_chain(&net->netdev_chain, val, info); | |
1964 | if (ret & NOTIFY_STOP_MASK) | |
1965 | return ret; | |
351638e7 JP |
1966 | return raw_notifier_call_chain(&netdev_chain, val, info); |
1967 | } | |
351638e7 | 1968 | |
9309f97a PM |
1969 | /** |
1970 | * call_netdevice_notifiers_info_robust - call per-netns notifier blocks | |
1971 | * for and rollback on error | |
1972 | * @val_up: value passed unmodified to notifier function | |
1973 | * @val_down: value passed unmodified to the notifier function when | |
1974 | * recovering from an error on @val_up | |
1975 | * @info: notifier information data | |
1976 | * | |
1977 | * Call all per-netns network notifier blocks, but not notifier blocks on | |
1978 | * the global notifier chain. Parameters and return value are as for | |
1979 | * raw_notifier_call_chain_robust(). | |
1980 | */ | |
1981 | ||
1982 | static int | |
1983 | call_netdevice_notifiers_info_robust(unsigned long val_up, | |
1984 | unsigned long val_down, | |
1985 | struct netdev_notifier_info *info) | |
1986 | { | |
1987 | struct net *net = dev_net(info->dev); | |
1988 | ||
1989 | ASSERT_RTNL(); | |
1990 | ||
1991 | return raw_notifier_call_chain_robust(&net->netdev_chain, | |
1992 | val_up, val_down, info); | |
1993 | } | |
1994 | ||
26372605 PM |
1995 | static int call_netdevice_notifiers_extack(unsigned long val, |
1996 | struct net_device *dev, | |
1997 | struct netlink_ext_ack *extack) | |
1998 | { | |
1999 | struct netdev_notifier_info info = { | |
2000 | .dev = dev, | |
2001 | .extack = extack, | |
2002 | }; | |
2003 | ||
2004 | return call_netdevice_notifiers_info(val, &info); | |
2005 | } | |
2006 | ||
1da177e4 LT |
2007 | /** |
2008 | * call_netdevice_notifiers - call all network notifier blocks | |
2009 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 2010 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
2011 | * |
2012 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 2013 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
2014 | */ |
2015 | ||
ad7379d4 | 2016 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 2017 | { |
26372605 | 2018 | return call_netdevice_notifiers_extack(val, dev, NULL); |
1da177e4 | 2019 | } |
edf947f1 | 2020 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 2021 | |
af7d6cce SD |
2022 | /** |
2023 | * call_netdevice_notifiers_mtu - call all network notifier blocks | |
2024 | * @val: value passed unmodified to notifier function | |
2025 | * @dev: net_device pointer passed unmodified to notifier function | |
2026 | * @arg: additional u32 argument passed to the notifier function | |
2027 | * | |
2028 | * Call all network notifier blocks. Parameters and return value | |
2029 | * are as for raw_notifier_call_chain(). | |
2030 | */ | |
2031 | static int call_netdevice_notifiers_mtu(unsigned long val, | |
2032 | struct net_device *dev, u32 arg) | |
2033 | { | |
2034 | struct netdev_notifier_info_ext info = { | |
2035 | .info.dev = dev, | |
2036 | .ext.mtu = arg, | |
2037 | }; | |
2038 | ||
2039 | BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0); | |
2040 | ||
2041 | return call_netdevice_notifiers_info(val, &info.info); | |
2042 | } | |
2043 | ||
1cf51900 | 2044 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 2045 | static DEFINE_STATIC_KEY_FALSE(ingress_needed_key); |
4577139b DB |
2046 | |
2047 | void net_inc_ingress_queue(void) | |
2048 | { | |
aabf6772 | 2049 | static_branch_inc(&ingress_needed_key); |
4577139b DB |
2050 | } |
2051 | EXPORT_SYMBOL_GPL(net_inc_ingress_queue); | |
2052 | ||
2053 | void net_dec_ingress_queue(void) | |
2054 | { | |
aabf6772 | 2055 | static_branch_dec(&ingress_needed_key); |
4577139b DB |
2056 | } |
2057 | EXPORT_SYMBOL_GPL(net_dec_ingress_queue); | |
2058 | #endif | |
2059 | ||
1f211a1b | 2060 | #ifdef CONFIG_NET_EGRESS |
aabf6772 | 2061 | static DEFINE_STATIC_KEY_FALSE(egress_needed_key); |
1f211a1b DB |
2062 | |
2063 | void net_inc_egress_queue(void) | |
2064 | { | |
aabf6772 | 2065 | static_branch_inc(&egress_needed_key); |
1f211a1b DB |
2066 | } |
2067 | EXPORT_SYMBOL_GPL(net_inc_egress_queue); | |
2068 | ||
2069 | void net_dec_egress_queue(void) | |
2070 | { | |
aabf6772 | 2071 | static_branch_dec(&egress_needed_key); |
1f211a1b DB |
2072 | } |
2073 | EXPORT_SYMBOL_GPL(net_dec_egress_queue); | |
2074 | #endif | |
2075 | ||
27942a15 MKL |
2076 | DEFINE_STATIC_KEY_FALSE(netstamp_needed_key); |
2077 | EXPORT_SYMBOL(netstamp_needed_key); | |
e9666d10 | 2078 | #ifdef CONFIG_JUMP_LABEL |
b90e5794 | 2079 | static atomic_t netstamp_needed_deferred; |
13baa00a | 2080 | static atomic_t netstamp_wanted; |
5fa8bbda | 2081 | static void netstamp_clear(struct work_struct *work) |
1da177e4 | 2082 | { |
b90e5794 | 2083 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
13baa00a | 2084 | int wanted; |
b90e5794 | 2085 | |
13baa00a ED |
2086 | wanted = atomic_add_return(deferred, &netstamp_wanted); |
2087 | if (wanted > 0) | |
39e83922 | 2088 | static_branch_enable(&netstamp_needed_key); |
13baa00a | 2089 | else |
39e83922 | 2090 | static_branch_disable(&netstamp_needed_key); |
5fa8bbda ED |
2091 | } |
2092 | static DECLARE_WORK(netstamp_work, netstamp_clear); | |
b90e5794 | 2093 | #endif |
5fa8bbda ED |
2094 | |
2095 | void net_enable_timestamp(void) | |
2096 | { | |
e9666d10 | 2097 | #ifdef CONFIG_JUMP_LABEL |
6af645a5 | 2098 | int wanted = atomic_read(&netstamp_wanted); |
13baa00a | 2099 | |
6af645a5 ED |
2100 | while (wanted > 0) { |
2101 | if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted + 1)) | |
13baa00a ED |
2102 | return; |
2103 | } | |
2104 | atomic_inc(&netstamp_needed_deferred); | |
2105 | schedule_work(&netstamp_work); | |
2106 | #else | |
39e83922 | 2107 | static_branch_inc(&netstamp_needed_key); |
13baa00a | 2108 | #endif |
1da177e4 | 2109 | } |
d1b19dff | 2110 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
2111 | |
2112 | void net_disable_timestamp(void) | |
2113 | { | |
e9666d10 | 2114 | #ifdef CONFIG_JUMP_LABEL |
6af645a5 | 2115 | int wanted = atomic_read(&netstamp_wanted); |
13baa00a | 2116 | |
6af645a5 ED |
2117 | while (wanted > 1) { |
2118 | if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted - 1)) | |
13baa00a ED |
2119 | return; |
2120 | } | |
2121 | atomic_dec(&netstamp_needed_deferred); | |
5fa8bbda ED |
2122 | schedule_work(&netstamp_work); |
2123 | #else | |
39e83922 | 2124 | static_branch_dec(&netstamp_needed_key); |
5fa8bbda | 2125 | #endif |
1da177e4 | 2126 | } |
d1b19dff | 2127 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 2128 | |
3b098e2d | 2129 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 2130 | { |
2456e855 | 2131 | skb->tstamp = 0; |
27942a15 | 2132 | skb->mono_delivery_time = 0; |
39e83922 | 2133 | if (static_branch_unlikely(&netstamp_needed_key)) |
d93376f5 | 2134 | skb->tstamp = ktime_get_real(); |
1da177e4 LT |
2135 | } |
2136 | ||
39e83922 DB |
2137 | #define net_timestamp_check(COND, SKB) \ |
2138 | if (static_branch_unlikely(&netstamp_needed_key)) { \ | |
2139 | if ((COND) && !(SKB)->tstamp) \ | |
d93376f5 | 2140 | (SKB)->tstamp = ktime_get_real(); \ |
39e83922 | 2141 | } \ |
3b098e2d | 2142 | |
f4b05d27 | 2143 | bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
79b569f0 | 2144 | { |
5f7d5728 | 2145 | return __is_skb_forwardable(dev, skb, true); |
79b569f0 | 2146 | } |
1ee481fb | 2147 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 2148 | |
5f7d5728 JDB |
2149 | static int __dev_forward_skb2(struct net_device *dev, struct sk_buff *skb, |
2150 | bool check_mtu) | |
a0265d28 | 2151 | { |
5f7d5728 | 2152 | int ret = ____dev_forward_skb(dev, skb, check_mtu); |
a0265d28 | 2153 | |
4e3264d2 MKL |
2154 | if (likely(!ret)) { |
2155 | skb->protocol = eth_type_trans(skb, dev); | |
2156 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
2157 | } | |
a0265d28 | 2158 | |
4e3264d2 | 2159 | return ret; |
a0265d28 | 2160 | } |
5f7d5728 JDB |
2161 | |
2162 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
2163 | { | |
2164 | return __dev_forward_skb2(dev, skb, true); | |
2165 | } | |
a0265d28 HX |
2166 | EXPORT_SYMBOL_GPL(__dev_forward_skb); |
2167 | ||
44540960 AB |
2168 | /** |
2169 | * dev_forward_skb - loopback an skb to another netif | |
2170 | * | |
2171 | * @dev: destination network device | |
2172 | * @skb: buffer to forward | |
2173 | * | |
2174 | * return values: | |
2175 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 2176 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
2177 | * |
2178 | * dev_forward_skb can be used for injecting an skb from the | |
2179 | * start_xmit function of one device into the receive queue | |
2180 | * of another device. | |
2181 | * | |
2182 | * The receiving device may be in another namespace, so | |
2183 | * we have to clear all information in the skb that could | |
2184 | * impact namespace isolation. | |
2185 | */ | |
2186 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
2187 | { | |
a0265d28 | 2188 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
2189 | } |
2190 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
2191 | ||
5f7d5728 JDB |
2192 | int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb) |
2193 | { | |
2194 | return __dev_forward_skb2(dev, skb, false) ?: netif_rx_internal(skb); | |
2195 | } | |
2196 | ||
71d9dec2 CG |
2197 | static inline int deliver_skb(struct sk_buff *skb, |
2198 | struct packet_type *pt_prev, | |
2199 | struct net_device *orig_dev) | |
2200 | { | |
1f8b977a | 2201 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
1080e512 | 2202 | return -ENOMEM; |
63354797 | 2203 | refcount_inc(&skb->users); |
71d9dec2 CG |
2204 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
2205 | } | |
2206 | ||
7866a621 SN |
2207 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
2208 | struct packet_type **pt, | |
fbcb2170 JP |
2209 | struct net_device *orig_dev, |
2210 | __be16 type, | |
7866a621 SN |
2211 | struct list_head *ptype_list) |
2212 | { | |
2213 | struct packet_type *ptype, *pt_prev = *pt; | |
2214 | ||
2215 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
2216 | if (ptype->type != type) | |
2217 | continue; | |
2218 | if (pt_prev) | |
fbcb2170 | 2219 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
2220 | pt_prev = ptype; |
2221 | } | |
2222 | *pt = pt_prev; | |
2223 | } | |
2224 | ||
c0de08d0 EL |
2225 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
2226 | { | |
a3d744e9 | 2227 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
2228 | return false; |
2229 | ||
2230 | if (ptype->id_match) | |
2231 | return ptype->id_match(ptype, skb->sk); | |
2232 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
2233 | return true; | |
2234 | ||
2235 | return false; | |
2236 | } | |
2237 | ||
9f9a742d MR |
2238 | /** |
2239 | * dev_nit_active - return true if any network interface taps are in use | |
2240 | * | |
2241 | * @dev: network device to check for the presence of taps | |
2242 | */ | |
2243 | bool dev_nit_active(struct net_device *dev) | |
2244 | { | |
2245 | return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all); | |
2246 | } | |
2247 | EXPORT_SYMBOL_GPL(dev_nit_active); | |
2248 | ||
1da177e4 LT |
2249 | /* |
2250 | * Support routine. Sends outgoing frames to any network | |
2251 | * taps currently in use. | |
2252 | */ | |
2253 | ||
74b20582 | 2254 | void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
2255 | { |
2256 | struct packet_type *ptype; | |
71d9dec2 CG |
2257 | struct sk_buff *skb2 = NULL; |
2258 | struct packet_type *pt_prev = NULL; | |
7866a621 | 2259 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 2260 | |
1da177e4 | 2261 | rcu_read_lock(); |
7866a621 SN |
2262 | again: |
2263 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
fa788d98 VW |
2264 | if (ptype->ignore_outgoing) |
2265 | continue; | |
2266 | ||
1da177e4 LT |
2267 | /* Never send packets back to the socket |
2268 | * they originated from - MvS (miquels@drinkel.ow.org) | |
2269 | */ | |
7866a621 SN |
2270 | if (skb_loop_sk(ptype, skb)) |
2271 | continue; | |
71d9dec2 | 2272 | |
7866a621 SN |
2273 | if (pt_prev) { |
2274 | deliver_skb(skb2, pt_prev, skb->dev); | |
2275 | pt_prev = ptype; | |
2276 | continue; | |
2277 | } | |
1da177e4 | 2278 | |
7866a621 SN |
2279 | /* need to clone skb, done only once */ |
2280 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2281 | if (!skb2) | |
2282 | goto out_unlock; | |
70978182 | 2283 | |
7866a621 | 2284 | net_timestamp_set(skb2); |
1da177e4 | 2285 | |
7866a621 SN |
2286 | /* skb->nh should be correctly |
2287 | * set by sender, so that the second statement is | |
2288 | * just protection against buggy protocols. | |
2289 | */ | |
2290 | skb_reset_mac_header(skb2); | |
2291 | ||
2292 | if (skb_network_header(skb2) < skb2->data || | |
2293 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
2294 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
2295 | ntohs(skb2->protocol), | |
2296 | dev->name); | |
2297 | skb_reset_network_header(skb2); | |
1da177e4 | 2298 | } |
7866a621 SN |
2299 | |
2300 | skb2->transport_header = skb2->network_header; | |
2301 | skb2->pkt_type = PACKET_OUTGOING; | |
2302 | pt_prev = ptype; | |
2303 | } | |
2304 | ||
2305 | if (ptype_list == &ptype_all) { | |
2306 | ptype_list = &dev->ptype_all; | |
2307 | goto again; | |
1da177e4 | 2308 | } |
7866a621 | 2309 | out_unlock: |
581fe0ea WB |
2310 | if (pt_prev) { |
2311 | if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) | |
2312 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
2313 | else | |
2314 | kfree_skb(skb2); | |
2315 | } | |
1da177e4 LT |
2316 | rcu_read_unlock(); |
2317 | } | |
74b20582 | 2318 | EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
1da177e4 | 2319 | |
2c53040f BH |
2320 | /** |
2321 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
2322 | * @dev: Network device |
2323 | * @txq: number of queues available | |
2324 | * | |
2325 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
2326 | * valid. To resolve this verify the tc mapping remains valid and if | |
2327 | * not NULL the mapping. With no priorities mapping to this | |
2328 | * offset/count pair it will no longer be used. In the worst case TC0 | |
2329 | * is invalid nothing can be done so disable priority mappings. If is | |
2330 | * expected that drivers will fix this mapping if they can before | |
2331 | * calling netif_set_real_num_tx_queues. | |
2332 | */ | |
bb134d22 | 2333 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
2334 | { |
2335 | int i; | |
2336 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2337 | ||
2338 | /* If TC0 is invalidated disable TC mapping */ | |
2339 | if (tc->offset + tc->count > txq) { | |
5b92be64 | 2340 | netdev_warn(dev, "Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
2341 | dev->num_tc = 0; |
2342 | return; | |
2343 | } | |
2344 | ||
2345 | /* Invalidated prio to tc mappings set to TC0 */ | |
2346 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
2347 | int q = netdev_get_prio_tc_map(dev, i); | |
2348 | ||
2349 | tc = &dev->tc_to_txq[q]; | |
2350 | if (tc->offset + tc->count > txq) { | |
5b92be64 JB |
2351 | netdev_warn(dev, "Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
2352 | i, q); | |
4f57c087 JF |
2353 | netdev_set_prio_tc_map(dev, i, 0); |
2354 | } | |
2355 | } | |
2356 | } | |
2357 | ||
8d059b0f AD |
2358 | int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
2359 | { | |
2360 | if (dev->num_tc) { | |
2361 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2362 | int i; | |
2363 | ||
ffcfe25b | 2364 | /* walk through the TCs and see if it falls into any of them */ |
8d059b0f AD |
2365 | for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { |
2366 | if ((txq - tc->offset) < tc->count) | |
2367 | return i; | |
2368 | } | |
2369 | ||
ffcfe25b | 2370 | /* didn't find it, just return -1 to indicate no match */ |
8d059b0f AD |
2371 | return -1; |
2372 | } | |
2373 | ||
2374 | return 0; | |
2375 | } | |
8a5f2166 | 2376 | EXPORT_SYMBOL(netdev_txq_to_tc); |
8d059b0f | 2377 | |
537c00de | 2378 | #ifdef CONFIG_XPS |
5da9ace3 VO |
2379 | static struct static_key xps_needed __read_mostly; |
2380 | static struct static_key xps_rxqs_needed __read_mostly; | |
537c00de AD |
2381 | static DEFINE_MUTEX(xps_map_mutex); |
2382 | #define xmap_dereference(P) \ | |
2383 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
2384 | ||
6234f874 | 2385 | static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
2d05bf01 | 2386 | struct xps_dev_maps *old_maps, int tci, u16 index) |
537c00de | 2387 | { |
10cdc3f3 AD |
2388 | struct xps_map *map = NULL; |
2389 | int pos; | |
537c00de | 2390 | |
f080864a | 2391 | map = xmap_dereference(dev_maps->attr_map[tci]); |
6234f874 AD |
2392 | if (!map) |
2393 | return false; | |
537c00de | 2394 | |
6234f874 AD |
2395 | for (pos = map->len; pos--;) { |
2396 | if (map->queues[pos] != index) | |
2397 | continue; | |
2398 | ||
2399 | if (map->len > 1) { | |
2400 | map->queues[pos] = map->queues[--map->len]; | |
10cdc3f3 | 2401 | break; |
537c00de | 2402 | } |
6234f874 | 2403 | |
2d05bf01 AT |
2404 | if (old_maps) |
2405 | RCU_INIT_POINTER(old_maps->attr_map[tci], NULL); | |
80d19669 | 2406 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
6234f874 AD |
2407 | kfree_rcu(map, rcu); |
2408 | return false; | |
537c00de AD |
2409 | } |
2410 | ||
6234f874 | 2411 | return true; |
10cdc3f3 AD |
2412 | } |
2413 | ||
6234f874 AD |
2414 | static bool remove_xps_queue_cpu(struct net_device *dev, |
2415 | struct xps_dev_maps *dev_maps, | |
2416 | int cpu, u16 offset, u16 count) | |
2417 | { | |
255c04a8 | 2418 | int num_tc = dev_maps->num_tc; |
184c449f AD |
2419 | bool active = false; |
2420 | int tci; | |
6234f874 | 2421 | |
184c449f AD |
2422 | for (tci = cpu * num_tc; num_tc--; tci++) { |
2423 | int i, j; | |
2424 | ||
2425 | for (i = count, j = offset; i--; j++) { | |
2d05bf01 | 2426 | if (!remove_xps_queue(dev_maps, NULL, tci, j)) |
184c449f AD |
2427 | break; |
2428 | } | |
2429 | ||
2430 | active |= i < 0; | |
6234f874 AD |
2431 | } |
2432 | ||
184c449f | 2433 | return active; |
6234f874 AD |
2434 | } |
2435 | ||
867d0ad4 SD |
2436 | static void reset_xps_maps(struct net_device *dev, |
2437 | struct xps_dev_maps *dev_maps, | |
044ab86d | 2438 | enum xps_map_type type) |
867d0ad4 | 2439 | { |
867d0ad4 | 2440 | static_key_slow_dec_cpuslocked(&xps_needed); |
044ab86d AT |
2441 | if (type == XPS_RXQS) |
2442 | static_key_slow_dec_cpuslocked(&xps_rxqs_needed); | |
2443 | ||
2444 | RCU_INIT_POINTER(dev->xps_maps[type], NULL); | |
2445 | ||
867d0ad4 SD |
2446 | kfree_rcu(dev_maps, rcu); |
2447 | } | |
2448 | ||
044ab86d AT |
2449 | static void clean_xps_maps(struct net_device *dev, enum xps_map_type type, |
2450 | u16 offset, u16 count) | |
80d19669 | 2451 | { |
044ab86d | 2452 | struct xps_dev_maps *dev_maps; |
80d19669 AN |
2453 | bool active = false; |
2454 | int i, j; | |
2455 | ||
044ab86d AT |
2456 | dev_maps = xmap_dereference(dev->xps_maps[type]); |
2457 | if (!dev_maps) | |
2458 | return; | |
2459 | ||
6f36158e AT |
2460 | for (j = 0; j < dev_maps->nr_ids; j++) |
2461 | active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, count); | |
867d0ad4 | 2462 | if (!active) |
044ab86d | 2463 | reset_xps_maps(dev, dev_maps, type); |
80d19669 | 2464 | |
044ab86d | 2465 | if (type == XPS_CPUS) { |
6f36158e | 2466 | for (i = offset + (count - 1); count--; i--) |
f28c020f | 2467 | netdev_queue_numa_node_write( |
6f36158e | 2468 | netdev_get_tx_queue(dev, i), NUMA_NO_NODE); |
80d19669 AN |
2469 | } |
2470 | } | |
2471 | ||
6234f874 AD |
2472 | static void netif_reset_xps_queues(struct net_device *dev, u16 offset, |
2473 | u16 count) | |
10cdc3f3 | 2474 | { |
04157469 AN |
2475 | if (!static_key_false(&xps_needed)) |
2476 | return; | |
10cdc3f3 | 2477 | |
4d99f660 | 2478 | cpus_read_lock(); |
04157469 | 2479 | mutex_lock(&xps_map_mutex); |
10cdc3f3 | 2480 | |
044ab86d AT |
2481 | if (static_key_false(&xps_rxqs_needed)) |
2482 | clean_xps_maps(dev, XPS_RXQS, offset, count); | |
80d19669 | 2483 | |
044ab86d | 2484 | clean_xps_maps(dev, XPS_CPUS, offset, count); |
024e9679 | 2485 | |
537c00de | 2486 | mutex_unlock(&xps_map_mutex); |
4d99f660 | 2487 | cpus_read_unlock(); |
537c00de AD |
2488 | } |
2489 | ||
6234f874 AD |
2490 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
2491 | { | |
2492 | netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); | |
2493 | } | |
2494 | ||
80d19669 AN |
2495 | static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, |
2496 | u16 index, bool is_rxqs_map) | |
01c5f864 AD |
2497 | { |
2498 | struct xps_map *new_map; | |
2499 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
2500 | int i, pos; | |
2501 | ||
2502 | for (pos = 0; map && pos < map->len; pos++) { | |
2503 | if (map->queues[pos] != index) | |
2504 | continue; | |
2505 | return map; | |
2506 | } | |
2507 | ||
80d19669 | 2508 | /* Need to add tx-queue to this CPU's/rx-queue's existing map */ |
01c5f864 AD |
2509 | if (map) { |
2510 | if (pos < map->alloc_len) | |
2511 | return map; | |
2512 | ||
2513 | alloc_len = map->alloc_len * 2; | |
2514 | } | |
2515 | ||
80d19669 AN |
2516 | /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's |
2517 | * map | |
2518 | */ | |
2519 | if (is_rxqs_map) | |
2520 | new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); | |
2521 | else | |
2522 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
2523 | cpu_to_node(attr_index)); | |
01c5f864 AD |
2524 | if (!new_map) |
2525 | return NULL; | |
2526 | ||
2527 | for (i = 0; i < pos; i++) | |
2528 | new_map->queues[i] = map->queues[i]; | |
2529 | new_map->alloc_len = alloc_len; | |
2530 | new_map->len = pos; | |
2531 | ||
2532 | return new_map; | |
2533 | } | |
2534 | ||
402fbb99 AT |
2535 | /* Copy xps maps at a given index */ |
2536 | static void xps_copy_dev_maps(struct xps_dev_maps *dev_maps, | |
2537 | struct xps_dev_maps *new_dev_maps, int index, | |
2538 | int tc, bool skip_tc) | |
2539 | { | |
2540 | int i, tci = index * dev_maps->num_tc; | |
2541 | struct xps_map *map; | |
2542 | ||
2543 | /* copy maps belonging to foreign traffic classes */ | |
2544 | for (i = 0; i < dev_maps->num_tc; i++, tci++) { | |
2545 | if (i == tc && skip_tc) | |
2546 | continue; | |
2547 | ||
2548 | /* fill in the new device map from the old device map */ | |
2549 | map = xmap_dereference(dev_maps->attr_map[tci]); | |
2550 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
2551 | } | |
2552 | } | |
2553 | ||
4d99f660 | 2554 | /* Must be called under cpus_read_lock */ |
80d19669 | 2555 | int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, |
044ab86d | 2556 | u16 index, enum xps_map_type type) |
537c00de | 2557 | { |
2d05bf01 | 2558 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL, *old_dev_maps = NULL; |
6f36158e | 2559 | const unsigned long *online_mask = NULL; |
255c04a8 | 2560 | bool active = false, copy = false; |
80d19669 | 2561 | int i, j, tci, numa_node_id = -2; |
184c449f | 2562 | int maps_sz, num_tc = 1, tc = 0; |
537c00de | 2563 | struct xps_map *map, *new_map; |
80d19669 | 2564 | unsigned int nr_ids; |
537c00de | 2565 | |
5dd0dfd5 NC |
2566 | WARN_ON_ONCE(index >= dev->num_tx_queues); |
2567 | ||
184c449f | 2568 | if (dev->num_tc) { |
ffcfe25b | 2569 | /* Do not allow XPS on subordinate device directly */ |
184c449f | 2570 | num_tc = dev->num_tc; |
ffcfe25b AD |
2571 | if (num_tc < 0) |
2572 | return -EINVAL; | |
2573 | ||
2574 | /* If queue belongs to subordinate dev use its map */ | |
2575 | dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; | |
2576 | ||
184c449f AD |
2577 | tc = netdev_txq_to_tc(dev, index); |
2578 | if (tc < 0) | |
2579 | return -EINVAL; | |
2580 | } | |
2581 | ||
537c00de | 2582 | mutex_lock(&xps_map_mutex); |
044ab86d AT |
2583 | |
2584 | dev_maps = xmap_dereference(dev->xps_maps[type]); | |
2585 | if (type == XPS_RXQS) { | |
80d19669 | 2586 | maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); |
80d19669 AN |
2587 | nr_ids = dev->num_rx_queues; |
2588 | } else { | |
2589 | maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); | |
6f36158e | 2590 | if (num_possible_cpus() > 1) |
80d19669 | 2591 | online_mask = cpumask_bits(cpu_online_mask); |
80d19669 AN |
2592 | nr_ids = nr_cpu_ids; |
2593 | } | |
537c00de | 2594 | |
80d19669 AN |
2595 | if (maps_sz < L1_CACHE_BYTES) |
2596 | maps_sz = L1_CACHE_BYTES; | |
537c00de | 2597 | |
255c04a8 | 2598 | /* The old dev_maps could be larger or smaller than the one we're |
5478fcd0 AT |
2599 | * setting up now, as dev->num_tc or nr_ids could have been updated in |
2600 | * between. We could try to be smart, but let's be safe instead and only | |
2601 | * copy foreign traffic classes if the two map sizes match. | |
255c04a8 | 2602 | */ |
5478fcd0 AT |
2603 | if (dev_maps && |
2604 | dev_maps->num_tc == num_tc && dev_maps->nr_ids == nr_ids) | |
255c04a8 AT |
2605 | copy = true; |
2606 | ||
01c5f864 | 2607 | /* allocate memory for queue storage */ |
80d19669 AN |
2608 | for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), |
2609 | j < nr_ids;) { | |
2bb60cb9 | 2610 | if (!new_dev_maps) { |
255c04a8 AT |
2611 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); |
2612 | if (!new_dev_maps) { | |
2613 | mutex_unlock(&xps_map_mutex); | |
2614 | return -ENOMEM; | |
2615 | } | |
2616 | ||
5478fcd0 | 2617 | new_dev_maps->nr_ids = nr_ids; |
255c04a8 | 2618 | new_dev_maps->num_tc = num_tc; |
2bb60cb9 | 2619 | } |
01c5f864 | 2620 | |
80d19669 | 2621 | tci = j * num_tc + tc; |
255c04a8 | 2622 | map = copy ? xmap_dereference(dev_maps->attr_map[tci]) : NULL; |
01c5f864 | 2623 | |
044ab86d | 2624 | map = expand_xps_map(map, j, index, type == XPS_RXQS); |
01c5f864 AD |
2625 | if (!map) |
2626 | goto error; | |
2627 | ||
80d19669 | 2628 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
01c5f864 AD |
2629 | } |
2630 | ||
2631 | if (!new_dev_maps) | |
2632 | goto out_no_new_maps; | |
2633 | ||
867d0ad4 SD |
2634 | if (!dev_maps) { |
2635 | /* Increment static keys at most once per type */ | |
2636 | static_key_slow_inc_cpuslocked(&xps_needed); | |
044ab86d | 2637 | if (type == XPS_RXQS) |
867d0ad4 SD |
2638 | static_key_slow_inc_cpuslocked(&xps_rxqs_needed); |
2639 | } | |
04157469 | 2640 | |
6f36158e | 2641 | for (j = 0; j < nr_ids; j++) { |
402fbb99 | 2642 | bool skip_tc = false; |
184c449f | 2643 | |
80d19669 | 2644 | tci = j * num_tc + tc; |
80d19669 AN |
2645 | if (netif_attr_test_mask(j, mask, nr_ids) && |
2646 | netif_attr_test_online(j, online_mask, nr_ids)) { | |
2647 | /* add tx-queue to CPU/rx-queue maps */ | |
01c5f864 AD |
2648 | int pos = 0; |
2649 | ||
402fbb99 AT |
2650 | skip_tc = true; |
2651 | ||
80d19669 | 2652 | map = xmap_dereference(new_dev_maps->attr_map[tci]); |
01c5f864 AD |
2653 | while ((pos < map->len) && (map->queues[pos] != index)) |
2654 | pos++; | |
2655 | ||
2656 | if (pos == map->len) | |
2657 | map->queues[map->len++] = index; | |
537c00de | 2658 | #ifdef CONFIG_NUMA |
044ab86d | 2659 | if (type == XPS_CPUS) { |
80d19669 AN |
2660 | if (numa_node_id == -2) |
2661 | numa_node_id = cpu_to_node(j); | |
2662 | else if (numa_node_id != cpu_to_node(j)) | |
2663 | numa_node_id = -1; | |
2664 | } | |
537c00de | 2665 | #endif |
537c00de | 2666 | } |
01c5f864 | 2667 | |
402fbb99 AT |
2668 | if (copy) |
2669 | xps_copy_dev_maps(dev_maps, new_dev_maps, j, tc, | |
2670 | skip_tc); | |
537c00de AD |
2671 | } |
2672 | ||
044ab86d | 2673 | rcu_assign_pointer(dev->xps_maps[type], new_dev_maps); |
01c5f864 | 2674 | |
537c00de | 2675 | /* Cleanup old maps */ |
184c449f AD |
2676 | if (!dev_maps) |
2677 | goto out_no_old_maps; | |
2678 | ||
6f36158e | 2679 | for (j = 0; j < dev_maps->nr_ids; j++) { |
255c04a8 | 2680 | for (i = num_tc, tci = j * dev_maps->num_tc; i--; tci++) { |
80d19669 | 2681 | map = xmap_dereference(dev_maps->attr_map[tci]); |
255c04a8 AT |
2682 | if (!map) |
2683 | continue; | |
2684 | ||
2685 | if (copy) { | |
2686 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
2687 | if (map == new_map) | |
2688 | continue; | |
2689 | } | |
2690 | ||
75b2758a | 2691 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
255c04a8 | 2692 | kfree_rcu(map, rcu); |
01c5f864 | 2693 | } |
537c00de AD |
2694 | } |
2695 | ||
2d05bf01 | 2696 | old_dev_maps = dev_maps; |
184c449f AD |
2697 | |
2698 | out_no_old_maps: | |
01c5f864 AD |
2699 | dev_maps = new_dev_maps; |
2700 | active = true; | |
537c00de | 2701 | |
01c5f864 | 2702 | out_no_new_maps: |
044ab86d | 2703 | if (type == XPS_CPUS) |
80d19669 AN |
2704 | /* update Tx queue numa node */ |
2705 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), | |
2706 | (numa_node_id >= 0) ? | |
2707 | numa_node_id : NUMA_NO_NODE); | |
537c00de | 2708 | |
01c5f864 AD |
2709 | if (!dev_maps) |
2710 | goto out_no_maps; | |
2711 | ||
80d19669 | 2712 | /* removes tx-queue from unused CPUs/rx-queues */ |
6f36158e | 2713 | for (j = 0; j < dev_maps->nr_ids; j++) { |
132f743b AT |
2714 | tci = j * dev_maps->num_tc; |
2715 | ||
2716 | for (i = 0; i < dev_maps->num_tc; i++, tci++) { | |
2717 | if (i == tc && | |
2718 | netif_attr_test_mask(j, mask, dev_maps->nr_ids) && | |
2719 | netif_attr_test_online(j, online_mask, dev_maps->nr_ids)) | |
2720 | continue; | |
2721 | ||
2d05bf01 AT |
2722 | active |= remove_xps_queue(dev_maps, |
2723 | copy ? old_dev_maps : NULL, | |
2724 | tci, index); | |
132f743b | 2725 | } |
01c5f864 AD |
2726 | } |
2727 | ||
2d05bf01 AT |
2728 | if (old_dev_maps) |
2729 | kfree_rcu(old_dev_maps, rcu); | |
2730 | ||
01c5f864 | 2731 | /* free map if not active */ |
867d0ad4 | 2732 | if (!active) |
044ab86d | 2733 | reset_xps_maps(dev, dev_maps, type); |
01c5f864 AD |
2734 | |
2735 | out_no_maps: | |
537c00de AD |
2736 | mutex_unlock(&xps_map_mutex); |
2737 | ||
2738 | return 0; | |
2739 | error: | |
01c5f864 | 2740 | /* remove any maps that we added */ |
6f36158e | 2741 | for (j = 0; j < nr_ids; j++) { |
80d19669 AN |
2742 | for (i = num_tc, tci = j * num_tc; i--; tci++) { |
2743 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
255c04a8 | 2744 | map = copy ? |
80d19669 | 2745 | xmap_dereference(dev_maps->attr_map[tci]) : |
184c449f AD |
2746 | NULL; |
2747 | if (new_map && new_map != map) | |
2748 | kfree(new_map); | |
2749 | } | |
01c5f864 AD |
2750 | } |
2751 | ||
537c00de AD |
2752 | mutex_unlock(&xps_map_mutex); |
2753 | ||
537c00de AD |
2754 | kfree(new_dev_maps); |
2755 | return -ENOMEM; | |
2756 | } | |
4d99f660 | 2757 | EXPORT_SYMBOL_GPL(__netif_set_xps_queue); |
80d19669 AN |
2758 | |
2759 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, | |
2760 | u16 index) | |
2761 | { | |
4d99f660 AV |
2762 | int ret; |
2763 | ||
2764 | cpus_read_lock(); | |
044ab86d | 2765 | ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, XPS_CPUS); |
4d99f660 AV |
2766 | cpus_read_unlock(); |
2767 | ||
2768 | return ret; | |
80d19669 | 2769 | } |
537c00de AD |
2770 | EXPORT_SYMBOL(netif_set_xps_queue); |
2771 | ||
2772 | #endif | |
ffcfe25b AD |
2773 | static void netdev_unbind_all_sb_channels(struct net_device *dev) |
2774 | { | |
2775 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2776 | ||
2777 | /* Unbind any subordinate channels */ | |
2778 | while (txq-- != &dev->_tx[0]) { | |
2779 | if (txq->sb_dev) | |
2780 | netdev_unbind_sb_channel(dev, txq->sb_dev); | |
2781 | } | |
2782 | } | |
2783 | ||
9cf1f6a8 AD |
2784 | void netdev_reset_tc(struct net_device *dev) |
2785 | { | |
6234f874 AD |
2786 | #ifdef CONFIG_XPS |
2787 | netif_reset_xps_queues_gt(dev, 0); | |
2788 | #endif | |
ffcfe25b AD |
2789 | netdev_unbind_all_sb_channels(dev); |
2790 | ||
2791 | /* Reset TC configuration of device */ | |
9cf1f6a8 AD |
2792 | dev->num_tc = 0; |
2793 | memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); | |
2794 | memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); | |
2795 | } | |
2796 | EXPORT_SYMBOL(netdev_reset_tc); | |
2797 | ||
2798 | int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) | |
2799 | { | |
2800 | if (tc >= dev->num_tc) | |
2801 | return -EINVAL; | |
2802 | ||
6234f874 AD |
2803 | #ifdef CONFIG_XPS |
2804 | netif_reset_xps_queues(dev, offset, count); | |
2805 | #endif | |
9cf1f6a8 AD |
2806 | dev->tc_to_txq[tc].count = count; |
2807 | dev->tc_to_txq[tc].offset = offset; | |
2808 | return 0; | |
2809 | } | |
2810 | EXPORT_SYMBOL(netdev_set_tc_queue); | |
2811 | ||
2812 | int netdev_set_num_tc(struct net_device *dev, u8 num_tc) | |
2813 | { | |
2814 | if (num_tc > TC_MAX_QUEUE) | |
2815 | return -EINVAL; | |
2816 | ||
6234f874 AD |
2817 | #ifdef CONFIG_XPS |
2818 | netif_reset_xps_queues_gt(dev, 0); | |
2819 | #endif | |
ffcfe25b AD |
2820 | netdev_unbind_all_sb_channels(dev); |
2821 | ||
9cf1f6a8 AD |
2822 | dev->num_tc = num_tc; |
2823 | return 0; | |
2824 | } | |
2825 | EXPORT_SYMBOL(netdev_set_num_tc); | |
2826 | ||
ffcfe25b AD |
2827 | void netdev_unbind_sb_channel(struct net_device *dev, |
2828 | struct net_device *sb_dev) | |
2829 | { | |
2830 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2831 | ||
2832 | #ifdef CONFIG_XPS | |
2833 | netif_reset_xps_queues_gt(sb_dev, 0); | |
2834 | #endif | |
2835 | memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq)); | |
2836 | memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map)); | |
2837 | ||
2838 | while (txq-- != &dev->_tx[0]) { | |
2839 | if (txq->sb_dev == sb_dev) | |
2840 | txq->sb_dev = NULL; | |
2841 | } | |
2842 | } | |
2843 | EXPORT_SYMBOL(netdev_unbind_sb_channel); | |
2844 | ||
2845 | int netdev_bind_sb_channel_queue(struct net_device *dev, | |
2846 | struct net_device *sb_dev, | |
2847 | u8 tc, u16 count, u16 offset) | |
2848 | { | |
2849 | /* Make certain the sb_dev and dev are already configured */ | |
2850 | if (sb_dev->num_tc >= 0 || tc >= dev->num_tc) | |
2851 | return -EINVAL; | |
2852 | ||
2853 | /* We cannot hand out queues we don't have */ | |
2854 | if ((offset + count) > dev->real_num_tx_queues) | |
2855 | return -EINVAL; | |
2856 | ||
2857 | /* Record the mapping */ | |
2858 | sb_dev->tc_to_txq[tc].count = count; | |
2859 | sb_dev->tc_to_txq[tc].offset = offset; | |
2860 | ||
2861 | /* Provide a way for Tx queue to find the tc_to_txq map or | |
2862 | * XPS map for itself. | |
2863 | */ | |
2864 | while (count--) | |
2865 | netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev; | |
2866 | ||
2867 | return 0; | |
2868 | } | |
2869 | EXPORT_SYMBOL(netdev_bind_sb_channel_queue); | |
2870 | ||
2871 | int netdev_set_sb_channel(struct net_device *dev, u16 channel) | |
2872 | { | |
2873 | /* Do not use a multiqueue device to represent a subordinate channel */ | |
2874 | if (netif_is_multiqueue(dev)) | |
2875 | return -ENODEV; | |
2876 | ||
2877 | /* We allow channels 1 - 32767 to be used for subordinate channels. | |
2878 | * Channel 0 is meant to be "native" mode and used only to represent | |
2879 | * the main root device. We allow writing 0 to reset the device back | |
2880 | * to normal mode after being used as a subordinate channel. | |
2881 | */ | |
2882 | if (channel > S16_MAX) | |
2883 | return -EINVAL; | |
2884 | ||
2885 | dev->num_tc = -channel; | |
2886 | ||
2887 | return 0; | |
2888 | } | |
2889 | EXPORT_SYMBOL(netdev_set_sb_channel); | |
2890 | ||
f0796d5c JF |
2891 | /* |
2892 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
3a053b1a | 2893 | * greater than real_num_tx_queues stale skbs on the qdisc must be flushed. |
f0796d5c | 2894 | */ |
e6484930 | 2895 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2896 | { |
ac5b7019 | 2897 | bool disabling; |
1d24eb48 TH |
2898 | int rc; |
2899 | ||
ac5b7019 JK |
2900 | disabling = txq < dev->real_num_tx_queues; |
2901 | ||
e6484930 TH |
2902 | if (txq < 1 || txq > dev->num_tx_queues) |
2903 | return -EINVAL; | |
f0796d5c | 2904 | |
5c56580b BH |
2905 | if (dev->reg_state == NETREG_REGISTERED || |
2906 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2907 | ASSERT_RTNL(); |
2908 | ||
1d24eb48 TH |
2909 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2910 | txq); | |
bf264145 TH |
2911 | if (rc) |
2912 | return rc; | |
2913 | ||
4f57c087 JF |
2914 | if (dev->num_tc) |
2915 | netif_setup_tc(dev, txq); | |
2916 | ||
1e080f17 JK |
2917 | dev_qdisc_change_real_num_tx(dev, txq); |
2918 | ||
ac5b7019 JK |
2919 | dev->real_num_tx_queues = txq; |
2920 | ||
2921 | if (disabling) { | |
2922 | synchronize_net(); | |
e6484930 | 2923 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2924 | #ifdef CONFIG_XPS |
2925 | netif_reset_xps_queues_gt(dev, txq); | |
2926 | #endif | |
2927 | } | |
ac5b7019 JK |
2928 | } else { |
2929 | dev->real_num_tx_queues = txq; | |
f0796d5c | 2930 | } |
e6484930 | 2931 | |
e6484930 | 2932 | return 0; |
f0796d5c JF |
2933 | } |
2934 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2935 | |
a953be53 | 2936 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2937 | /** |
2938 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2939 | * @dev: Network device | |
2940 | * @rxq: Actual number of RX queues | |
2941 | * | |
2942 | * This must be called either with the rtnl_lock held or before | |
2943 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2944 | * negative error code. If called before registration, it always |
2945 | * succeeds. | |
62fe0b40 BH |
2946 | */ |
2947 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2948 | { | |
2949 | int rc; | |
2950 | ||
bd25fa7b TH |
2951 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2952 | return -EINVAL; | |
2953 | ||
62fe0b40 BH |
2954 | if (dev->reg_state == NETREG_REGISTERED) { |
2955 | ASSERT_RTNL(); | |
2956 | ||
62fe0b40 BH |
2957 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2958 | rxq); | |
2959 | if (rc) | |
2960 | return rc; | |
62fe0b40 BH |
2961 | } |
2962 | ||
2963 | dev->real_num_rx_queues = rxq; | |
2964 | return 0; | |
2965 | } | |
2966 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2967 | #endif | |
2968 | ||
271e5b7d JK |
2969 | /** |
2970 | * netif_set_real_num_queues - set actual number of RX and TX queues used | |
2971 | * @dev: Network device | |
2972 | * @txq: Actual number of TX queues | |
2973 | * @rxq: Actual number of RX queues | |
2974 | * | |
2975 | * Set the real number of both TX and RX queues. | |
2976 | * Does nothing if the number of queues is already correct. | |
2977 | */ | |
2978 | int netif_set_real_num_queues(struct net_device *dev, | |
2979 | unsigned int txq, unsigned int rxq) | |
2980 | { | |
2981 | unsigned int old_rxq = dev->real_num_rx_queues; | |
2982 | int err; | |
2983 | ||
2984 | if (txq < 1 || txq > dev->num_tx_queues || | |
2985 | rxq < 1 || rxq > dev->num_rx_queues) | |
2986 | return -EINVAL; | |
2987 | ||
2988 | /* Start from increases, so the error path only does decreases - | |
2989 | * decreases can't fail. | |
2990 | */ | |
2991 | if (rxq > dev->real_num_rx_queues) { | |
2992 | err = netif_set_real_num_rx_queues(dev, rxq); | |
2993 | if (err) | |
2994 | return err; | |
2995 | } | |
2996 | if (txq > dev->real_num_tx_queues) { | |
2997 | err = netif_set_real_num_tx_queues(dev, txq); | |
2998 | if (err) | |
2999 | goto undo_rx; | |
3000 | } | |
3001 | if (rxq < dev->real_num_rx_queues) | |
3002 | WARN_ON(netif_set_real_num_rx_queues(dev, rxq)); | |
3003 | if (txq < dev->real_num_tx_queues) | |
3004 | WARN_ON(netif_set_real_num_tx_queues(dev, txq)); | |
3005 | ||
3006 | return 0; | |
3007 | undo_rx: | |
3008 | WARN_ON(netif_set_real_num_rx_queues(dev, old_rxq)); | |
3009 | return err; | |
3010 | } | |
3011 | EXPORT_SYMBOL(netif_set_real_num_queues); | |
3012 | ||
14d7b812 JK |
3013 | /** |
3014 | * netif_set_tso_max_size() - set the max size of TSO frames supported | |
3015 | * @dev: netdev to update | |
3016 | * @size: max skb->len of a TSO frame | |
3017 | * | |
3018 | * Set the limit on the size of TSO super-frames the device can handle. | |
7c4e983c AD |
3019 | * Unless explicitly set the stack will assume the value of |
3020 | * %GSO_LEGACY_MAX_SIZE. | |
14d7b812 JK |
3021 | */ |
3022 | void netif_set_tso_max_size(struct net_device *dev, unsigned int size) | |
3023 | { | |
7c4e983c | 3024 | dev->tso_max_size = min(GSO_MAX_SIZE, size); |
14d7b812 JK |
3025 | if (size < READ_ONCE(dev->gso_max_size)) |
3026 | netif_set_gso_max_size(dev, size); | |
9eefedd5 XL |
3027 | if (size < READ_ONCE(dev->gso_ipv4_max_size)) |
3028 | netif_set_gso_ipv4_max_size(dev, size); | |
14d7b812 JK |
3029 | } |
3030 | EXPORT_SYMBOL(netif_set_tso_max_size); | |
3031 | ||
3032 | /** | |
3033 | * netif_set_tso_max_segs() - set the max number of segs supported for TSO | |
3034 | * @dev: netdev to update | |
3035 | * @segs: max number of TCP segments | |
3036 | * | |
3037 | * Set the limit on the number of TCP segments the device can generate from | |
3038 | * a single TSO super-frame. | |
3039 | * Unless explicitly set the stack will assume the value of %GSO_MAX_SEGS. | |
3040 | */ | |
3041 | void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs) | |
3042 | { | |
3043 | dev->tso_max_segs = segs; | |
3044 | if (segs < READ_ONCE(dev->gso_max_segs)) | |
3045 | netif_set_gso_max_segs(dev, segs); | |
3046 | } | |
3047 | EXPORT_SYMBOL(netif_set_tso_max_segs); | |
3048 | ||
6df6398f JK |
3049 | /** |
3050 | * netif_inherit_tso_max() - copy all TSO limits from a lower device to an upper | |
3051 | * @to: netdev to update | |
3052 | * @from: netdev from which to copy the limits | |
3053 | */ | |
3054 | void netif_inherit_tso_max(struct net_device *to, const struct net_device *from) | |
3055 | { | |
ee8b7a11 JK |
3056 | netif_set_tso_max_size(to, from->tso_max_size); |
3057 | netif_set_tso_max_segs(to, from->tso_max_segs); | |
6df6398f JK |
3058 | } |
3059 | EXPORT_SYMBOL(netif_inherit_tso_max); | |
3060 | ||
2c53040f BH |
3061 | /** |
3062 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 | 3063 | * |
046e1537 ÍH |
3064 | * Default value is the number of physical cores if there are only 1 or 2, or |
3065 | * divided by 2 if there are more. | |
16917b87 | 3066 | */ |
a55b138b | 3067 | int netif_get_num_default_rss_queues(void) |
16917b87 | 3068 | { |
046e1537 ÍH |
3069 | cpumask_var_t cpus; |
3070 | int cpu, count = 0; | |
3071 | ||
3072 | if (unlikely(is_kdump_kernel() || !zalloc_cpumask_var(&cpus, GFP_KERNEL))) | |
3073 | return 1; | |
3074 | ||
3075 | cpumask_copy(cpus, cpu_online_mask); | |
3076 | for_each_cpu(cpu, cpus) { | |
3077 | ++count; | |
3078 | cpumask_andnot(cpus, cpus, topology_sibling_cpumask(cpu)); | |
3079 | } | |
3080 | free_cpumask_var(cpus); | |
3081 | ||
3082 | return count > 2 ? DIV_ROUND_UP(count, 2) : count; | |
16917b87 YM |
3083 | } |
3084 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
3085 | ||
3bcb846c | 3086 | static void __netif_reschedule(struct Qdisc *q) |
56079431 | 3087 | { |
def82a1d JP |
3088 | struct softnet_data *sd; |
3089 | unsigned long flags; | |
56079431 | 3090 | |
def82a1d | 3091 | local_irq_save(flags); |
903ceff7 | 3092 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
3093 | q->next_sched = NULL; |
3094 | *sd->output_queue_tailp = q; | |
3095 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
3096 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
3097 | local_irq_restore(flags); | |
3098 | } | |
3099 | ||
3100 | void __netif_schedule(struct Qdisc *q) | |
3101 | { | |
3102 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
3103 | __netif_reschedule(q); | |
56079431 DV |
3104 | } |
3105 | EXPORT_SYMBOL(__netif_schedule); | |
3106 | ||
e6247027 | 3107 | struct dev_kfree_skb_cb { |
40bbae58 | 3108 | enum skb_drop_reason reason; |
e6247027 ED |
3109 | }; |
3110 | ||
3111 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 3112 | { |
e6247027 ED |
3113 | return (struct dev_kfree_skb_cb *)skb->cb; |
3114 | } | |
3115 | ||
46e5da40 JF |
3116 | void netif_schedule_queue(struct netdev_queue *txq) |
3117 | { | |
3118 | rcu_read_lock(); | |
5be5515a | 3119 | if (!netif_xmit_stopped(txq)) { |
46e5da40 JF |
3120 | struct Qdisc *q = rcu_dereference(txq->qdisc); |
3121 | ||
3122 | __netif_schedule(q); | |
3123 | } | |
3124 | rcu_read_unlock(); | |
3125 | } | |
3126 | EXPORT_SYMBOL(netif_schedule_queue); | |
3127 | ||
46e5da40 JF |
3128 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
3129 | { | |
3130 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
3131 | struct Qdisc *q; | |
3132 | ||
3133 | rcu_read_lock(); | |
3134 | q = rcu_dereference(dev_queue->qdisc); | |
3135 | __netif_schedule(q); | |
3136 | rcu_read_unlock(); | |
3137 | } | |
3138 | } | |
3139 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
3140 | ||
40bbae58 | 3141 | void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason) |
56079431 | 3142 | { |
e6247027 | 3143 | unsigned long flags; |
56079431 | 3144 | |
9899886d MJ |
3145 | if (unlikely(!skb)) |
3146 | return; | |
3147 | ||
63354797 | 3148 | if (likely(refcount_read(&skb->users) == 1)) { |
e6247027 | 3149 | smp_rmb(); |
63354797 RE |
3150 | refcount_set(&skb->users, 0); |
3151 | } else if (likely(!refcount_dec_and_test(&skb->users))) { | |
e6247027 | 3152 | return; |
bea3348e | 3153 | } |
e6247027 ED |
3154 | get_kfree_skb_cb(skb)->reason = reason; |
3155 | local_irq_save(flags); | |
3156 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
3157 | __this_cpu_write(softnet_data.completion_queue, skb); | |
3158 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
3159 | local_irq_restore(flags); | |
56079431 | 3160 | } |
40bbae58 | 3161 | EXPORT_SYMBOL(dev_kfree_skb_irq_reason); |
56079431 | 3162 | |
40bbae58 | 3163 | void dev_kfree_skb_any_reason(struct sk_buff *skb, enum skb_drop_reason reason) |
56079431 | 3164 | { |
afa79d08 | 3165 | if (in_hardirq() || irqs_disabled()) |
40bbae58 | 3166 | dev_kfree_skb_irq_reason(skb, reason); |
56079431 | 3167 | else |
40bbae58 | 3168 | kfree_skb_reason(skb, reason); |
56079431 | 3169 | } |
40bbae58 | 3170 | EXPORT_SYMBOL(dev_kfree_skb_any_reason); |
56079431 DV |
3171 | |
3172 | ||
bea3348e SH |
3173 | /** |
3174 | * netif_device_detach - mark device as removed | |
3175 | * @dev: network device | |
3176 | * | |
3177 | * Mark device as removed from system and therefore no longer available. | |
3178 | */ | |
56079431 DV |
3179 | void netif_device_detach(struct net_device *dev) |
3180 | { | |
3181 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
3182 | netif_running(dev)) { | |
d543103a | 3183 | netif_tx_stop_all_queues(dev); |
56079431 DV |
3184 | } |
3185 | } | |
3186 | EXPORT_SYMBOL(netif_device_detach); | |
3187 | ||
bea3348e SH |
3188 | /** |
3189 | * netif_device_attach - mark device as attached | |
3190 | * @dev: network device | |
3191 | * | |
3192 | * Mark device as attached from system and restart if needed. | |
3193 | */ | |
56079431 DV |
3194 | void netif_device_attach(struct net_device *dev) |
3195 | { | |
3196 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
3197 | netif_running(dev)) { | |
d543103a | 3198 | netif_tx_wake_all_queues(dev); |
4ec93edb | 3199 | __netdev_watchdog_up(dev); |
56079431 DV |
3200 | } |
3201 | } | |
3202 | EXPORT_SYMBOL(netif_device_attach); | |
3203 | ||
5605c762 JP |
3204 | /* |
3205 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
3206 | * to be used as a distribution range. | |
3207 | */ | |
eadec877 AD |
3208 | static u16 skb_tx_hash(const struct net_device *dev, |
3209 | const struct net_device *sb_dev, | |
3210 | struct sk_buff *skb) | |
5605c762 JP |
3211 | { |
3212 | u32 hash; | |
3213 | u16 qoffset = 0; | |
1b837d48 | 3214 | u16 qcount = dev->real_num_tx_queues; |
5605c762 | 3215 | |
eadec877 AD |
3216 | if (dev->num_tc) { |
3217 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
3218 | ||
3219 | qoffset = sb_dev->tc_to_txq[tc].offset; | |
3220 | qcount = sb_dev->tc_to_txq[tc].count; | |
0c57eeec MC |
3221 | if (unlikely(!qcount)) { |
3222 | net_warn_ratelimited("%s: invalid qcount, qoffset %u for tc %u\n", | |
3223 | sb_dev->name, qoffset, tc); | |
3224 | qoffset = 0; | |
3225 | qcount = dev->real_num_tx_queues; | |
3226 | } | |
eadec877 AD |
3227 | } |
3228 | ||
5605c762 | 3229 | if (skb_rx_queue_recorded(skb)) { |
066b8678 | 3230 | DEBUG_NET_WARN_ON_ONCE(qcount == 0); |
5605c762 | 3231 | hash = skb_get_rx_queue(skb); |
6e11d157 AN |
3232 | if (hash >= qoffset) |
3233 | hash -= qoffset; | |
1b837d48 AD |
3234 | while (unlikely(hash >= qcount)) |
3235 | hash -= qcount; | |
eadec877 | 3236 | return hash + qoffset; |
5605c762 JP |
3237 | } |
3238 | ||
3239 | return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; | |
3240 | } | |
5605c762 | 3241 | |
d457a0e3 | 3242 | void skb_warn_bad_offload(const struct sk_buff *skb) |
36c92474 | 3243 | { |
84d15ae5 | 3244 | static const netdev_features_t null_features; |
36c92474 | 3245 | struct net_device *dev = skb->dev; |
88ad4175 | 3246 | const char *name = ""; |
36c92474 | 3247 | |
c846ad9b BG |
3248 | if (!net_ratelimit()) |
3249 | return; | |
3250 | ||
88ad4175 BM |
3251 | if (dev) { |
3252 | if (dev->dev.parent) | |
3253 | name = dev_driver_string(dev->dev.parent); | |
3254 | else | |
3255 | name = netdev_name(dev); | |
3256 | } | |
6413139d WB |
3257 | skb_dump(KERN_WARNING, skb, false); |
3258 | WARN(1, "%s: caps=(%pNF, %pNF)\n", | |
88ad4175 | 3259 | name, dev ? &dev->features : &null_features, |
6413139d | 3260 | skb->sk ? &skb->sk->sk_route_caps : &null_features); |
36c92474 BH |
3261 | } |
3262 | ||
1da177e4 LT |
3263 | /* |
3264 | * Invalidate hardware checksum when packet is to be mangled, and | |
3265 | * complete checksum manually on outgoing path. | |
3266 | */ | |
84fa7933 | 3267 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 3268 | { |
d3bc23e7 | 3269 | __wsum csum; |
663ead3b | 3270 | int ret = 0, offset; |
1da177e4 | 3271 | |
84fa7933 | 3272 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
3273 | goto out_set_summed; |
3274 | ||
3aefd7d6 | 3275 | if (unlikely(skb_is_gso(skb))) { |
36c92474 BH |
3276 | skb_warn_bad_offload(skb); |
3277 | return -EINVAL; | |
1da177e4 LT |
3278 | } |
3279 | ||
cef401de ED |
3280 | /* Before computing a checksum, we should make sure no frag could |
3281 | * be modified by an external entity : checksum could be wrong. | |
3282 | */ | |
3283 | if (skb_has_shared_frag(skb)) { | |
3284 | ret = __skb_linearize(skb); | |
3285 | if (ret) | |
3286 | goto out; | |
3287 | } | |
3288 | ||
55508d60 | 3289 | offset = skb_checksum_start_offset(skb); |
d7ea0d9d | 3290 | ret = -EINVAL; |
26c29961 | 3291 | if (unlikely(offset >= skb_headlen(skb))) { |
eeee4b77 | 3292 | DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); |
26c29961 ED |
3293 | WARN_ONCE(true, "offset (%d) >= skb_headlen() (%u)\n", |
3294 | offset, skb_headlen(skb)); | |
d7ea0d9d | 3295 | goto out; |
eeee4b77 | 3296 | } |
a030847e HX |
3297 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
3298 | ||
3299 | offset += skb->csum_offset; | |
26c29961 | 3300 | if (unlikely(offset + sizeof(__sum16) > skb_headlen(skb))) { |
eeee4b77 | 3301 | DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); |
26c29961 ED |
3302 | WARN_ONCE(true, "offset+2 (%zu) > skb_headlen() (%u)\n", |
3303 | offset + sizeof(__sum16), skb_headlen(skb)); | |
d7ea0d9d | 3304 | goto out; |
eeee4b77 | 3305 | } |
8211fbfa HK |
3306 | ret = skb_ensure_writable(skb, offset + sizeof(__sum16)); |
3307 | if (ret) | |
3308 | goto out; | |
1da177e4 | 3309 | |
4f2e4ad5 | 3310 | *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
a430a43d | 3311 | out_set_summed: |
1da177e4 | 3312 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 3313 | out: |
1da177e4 LT |
3314 | return ret; |
3315 | } | |
d1b19dff | 3316 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 3317 | |
b72b5bf6 DC |
3318 | int skb_crc32c_csum_help(struct sk_buff *skb) |
3319 | { | |
3320 | __le32 crc32c_csum; | |
3321 | int ret = 0, offset, start; | |
3322 | ||
3323 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
3324 | goto out; | |
3325 | ||
3326 | if (unlikely(skb_is_gso(skb))) | |
3327 | goto out; | |
3328 | ||
3329 | /* Before computing a checksum, we should make sure no frag could | |
3330 | * be modified by an external entity : checksum could be wrong. | |
3331 | */ | |
3332 | if (unlikely(skb_has_shared_frag(skb))) { | |
3333 | ret = __skb_linearize(skb); | |
3334 | if (ret) | |
3335 | goto out; | |
3336 | } | |
3337 | start = skb_checksum_start_offset(skb); | |
3338 | offset = start + offsetof(struct sctphdr, checksum); | |
3339 | if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { | |
3340 | ret = -EINVAL; | |
3341 | goto out; | |
3342 | } | |
8211fbfa HK |
3343 | |
3344 | ret = skb_ensure_writable(skb, offset + sizeof(__le32)); | |
3345 | if (ret) | |
3346 | goto out; | |
3347 | ||
b72b5bf6 DC |
3348 | crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start, |
3349 | skb->len - start, ~(__u32)0, | |
3350 | crc32c_csum_stub)); | |
3351 | *(__le32 *)(skb->data + offset) = crc32c_csum; | |
c24831a1 | 3352 | skb_reset_csum_not_inet(skb); |
b72b5bf6 DC |
3353 | out: |
3354 | return ret; | |
3355 | } | |
3356 | ||
53d6471c | 3357 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 3358 | { |
252e3346 | 3359 | __be16 type = skb->protocol; |
f6a78bfc | 3360 | |
19acc327 PS |
3361 | /* Tunnel gso handlers can set protocol to ethernet. */ |
3362 | if (type == htons(ETH_P_TEB)) { | |
3363 | struct ethhdr *eth; | |
3364 | ||
3365 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
3366 | return 0; | |
3367 | ||
1dfe82eb | 3368 | eth = (struct ethhdr *)skb->data; |
19acc327 PS |
3369 | type = eth->h_proto; |
3370 | } | |
3371 | ||
4063384e | 3372 | return vlan_get_protocol_and_depth(skb, type, depth); |
ec5f0615 PS |
3373 | } |
3374 | ||
f6a78bfc | 3375 | |
fb286bb2 HX |
3376 | /* Take action when hardware reception checksum errors are detected. */ |
3377 | #ifdef CONFIG_BUG | |
127d7355 TL |
3378 | static void do_netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
3379 | { | |
5b92be64 | 3380 | netdev_err(dev, "hw csum failure\n"); |
127d7355 TL |
3381 | skb_dump(KERN_ERR, skb, true); |
3382 | dump_stack(); | |
3383 | } | |
3384 | ||
7fe50ac8 | 3385 | void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
fb286bb2 | 3386 | { |
127d7355 | 3387 | DO_ONCE_LITE(do_netdev_rx_csum_fault, dev, skb); |
fb286bb2 HX |
3388 | } |
3389 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
3390 | #endif | |
3391 | ||
ab74cfeb | 3392 | /* XXX: check that highmem exists at all on the given machine. */ |
c1e756bf | 3393 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 3394 | { |
3d3a8533 | 3395 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 3396 | int i; |
f4563a75 | 3397 | |
5acbbd42 | 3398 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
3399 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
3400 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
f4563a75 | 3401 | |
ea2ab693 | 3402 | if (PageHighMem(skb_frag_page(frag))) |
5acbbd42 | 3403 | return 1; |
ea2ab693 | 3404 | } |
5acbbd42 | 3405 | } |
3d3a8533 | 3406 | #endif |
1da177e4 LT |
3407 | return 0; |
3408 | } | |
1da177e4 | 3409 | |
3b392ddb SH |
3410 | /* If MPLS offload request, verify we are testing hardware MPLS features |
3411 | * instead of standard features for the netdev. | |
3412 | */ | |
d0edc7bf | 3413 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
3414 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
3415 | netdev_features_t features, | |
3416 | __be16 type) | |
3417 | { | |
25cd9ba0 | 3418 | if (eth_p_mpls(type)) |
3b392ddb SH |
3419 | features &= skb->dev->mpls_features; |
3420 | ||
3421 | return features; | |
3422 | } | |
3423 | #else | |
3424 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
3425 | netdev_features_t features, | |
3426 | __be16 type) | |
3427 | { | |
3428 | return features; | |
3429 | } | |
3430 | #endif | |
3431 | ||
c8f44aff | 3432 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 3433 | netdev_features_t features) |
f01a5236 | 3434 | { |
3b392ddb SH |
3435 | __be16 type; |
3436 | ||
9fc95f50 | 3437 | type = skb_network_protocol(skb, NULL); |
3b392ddb | 3438 | features = net_mpls_features(skb, features, type); |
53d6471c | 3439 | |
c0d680e5 | 3440 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 3441 | !can_checksum_protocol(features, type)) { |
996e8021 | 3442 | features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
f01a5236 | 3443 | } |
7be2c82c ED |
3444 | if (illegal_highdma(skb->dev, skb)) |
3445 | features &= ~NETIF_F_SG; | |
f01a5236 JG |
3446 | |
3447 | return features; | |
3448 | } | |
3449 | ||
e38f3025 TM |
3450 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
3451 | struct net_device *dev, | |
3452 | netdev_features_t features) | |
3453 | { | |
3454 | return features; | |
3455 | } | |
3456 | EXPORT_SYMBOL(passthru_features_check); | |
3457 | ||
7ce23672 | 3458 | static netdev_features_t dflt_features_check(struct sk_buff *skb, |
8cb65d00 TM |
3459 | struct net_device *dev, |
3460 | netdev_features_t features) | |
3461 | { | |
3462 | return vlan_features_check(skb, features); | |
3463 | } | |
3464 | ||
cbc53e08 AD |
3465 | static netdev_features_t gso_features_check(const struct sk_buff *skb, |
3466 | struct net_device *dev, | |
3467 | netdev_features_t features) | |
3468 | { | |
3469 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
3470 | ||
6d872df3 | 3471 | if (gso_segs > READ_ONCE(dev->gso_max_segs)) |
cbc53e08 AD |
3472 | return features & ~NETIF_F_GSO_MASK; |
3473 | ||
24ab059d ED |
3474 | if (unlikely(skb->len >= READ_ONCE(dev->gso_max_size))) |
3475 | return features & ~NETIF_F_GSO_MASK; | |
3476 | ||
1d155dfd HK |
3477 | if (!skb_shinfo(skb)->gso_type) { |
3478 | skb_warn_bad_offload(skb); | |
3479 | return features & ~NETIF_F_GSO_MASK; | |
3480 | } | |
3481 | ||
802ab55a AD |
3482 | /* Support for GSO partial features requires software |
3483 | * intervention before we can actually process the packets | |
3484 | * so we need to strip support for any partial features now | |
3485 | * and we can pull them back in after we have partially | |
3486 | * segmented the frame. | |
3487 | */ | |
3488 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) | |
3489 | features &= ~dev->gso_partial_features; | |
3490 | ||
3491 | /* Make sure to clear the IPv4 ID mangling feature if the | |
3492 | * IPv4 header has the potential to be fragmented. | |
cbc53e08 AD |
3493 | */ |
3494 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
3495 | struct iphdr *iph = skb->encapsulation ? | |
3496 | inner_ip_hdr(skb) : ip_hdr(skb); | |
3497 | ||
3498 | if (!(iph->frag_off & htons(IP_DF))) | |
3499 | features &= ~NETIF_F_TSO_MANGLEID; | |
3500 | } | |
3501 | ||
3502 | return features; | |
3503 | } | |
3504 | ||
c1e756bf | 3505 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 3506 | { |
5f35227e | 3507 | struct net_device *dev = skb->dev; |
fcbeb976 | 3508 | netdev_features_t features = dev->features; |
58e998c6 | 3509 | |
cbc53e08 AD |
3510 | if (skb_is_gso(skb)) |
3511 | features = gso_features_check(skb, dev, features); | |
30b678d8 | 3512 | |
5f35227e JG |
3513 | /* If encapsulation offload request, verify we are testing |
3514 | * hardware encapsulation features instead of standard | |
3515 | * features for the netdev | |
3516 | */ | |
3517 | if (skb->encapsulation) | |
3518 | features &= dev->hw_enc_features; | |
3519 | ||
f5a7fb88 TM |
3520 | if (skb_vlan_tagged(skb)) |
3521 | features = netdev_intersect_features(features, | |
3522 | dev->vlan_features | | |
3523 | NETIF_F_HW_VLAN_CTAG_TX | | |
3524 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 3525 | |
5f35227e JG |
3526 | if (dev->netdev_ops->ndo_features_check) |
3527 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
3528 | features); | |
8cb65d00 TM |
3529 | else |
3530 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 3531 | |
c1e756bf | 3532 | return harmonize_features(skb, features); |
58e998c6 | 3533 | } |
c1e756bf | 3534 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 3535 | |
2ea25513 | 3536 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 3537 | struct netdev_queue *txq, bool more) |
f6a78bfc | 3538 | { |
2ea25513 DM |
3539 | unsigned int len; |
3540 | int rc; | |
00829823 | 3541 | |
9f9a742d | 3542 | if (dev_nit_active(dev)) |
2ea25513 | 3543 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 3544 | |
2ea25513 DM |
3545 | len = skb->len; |
3546 | trace_net_dev_start_xmit(skb, dev); | |
95f6b3dd | 3547 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 3548 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 3549 | |
2ea25513 DM |
3550 | return rc; |
3551 | } | |
7b9c6090 | 3552 | |
8dcda22a DM |
3553 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
3554 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
3555 | { |
3556 | struct sk_buff *skb = first; | |
3557 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 3558 | |
7f2e870f DM |
3559 | while (skb) { |
3560 | struct sk_buff *next = skb->next; | |
fc70fb64 | 3561 | |
a8305bff | 3562 | skb_mark_not_on_list(skb); |
95f6b3dd | 3563 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
3564 | if (unlikely(!dev_xmit_complete(rc))) { |
3565 | skb->next = next; | |
3566 | goto out; | |
3567 | } | |
6afff0ca | 3568 | |
7f2e870f | 3569 | skb = next; |
fe60faa5 | 3570 | if (netif_tx_queue_stopped(txq) && skb) { |
7f2e870f DM |
3571 | rc = NETDEV_TX_BUSY; |
3572 | break; | |
9ccb8975 | 3573 | } |
7f2e870f | 3574 | } |
9ccb8975 | 3575 | |
7f2e870f DM |
3576 | out: |
3577 | *ret = rc; | |
3578 | return skb; | |
3579 | } | |
b40863c6 | 3580 | |
1ff0dc94 ED |
3581 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
3582 | netdev_features_t features) | |
f6a78bfc | 3583 | { |
df8a39de | 3584 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
3585 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
3586 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
3587 | return skb; |
3588 | } | |
f6a78bfc | 3589 | |
43c26a1a DC |
3590 | int skb_csum_hwoffload_help(struct sk_buff *skb, |
3591 | const netdev_features_t features) | |
3592 | { | |
fa821170 | 3593 | if (unlikely(skb_csum_is_sctp(skb))) |
43c26a1a DC |
3594 | return !!(features & NETIF_F_SCTP_CRC) ? 0 : |
3595 | skb_crc32c_csum_help(skb); | |
3596 | ||
62fafcd6 XL |
3597 | if (features & NETIF_F_HW_CSUM) |
3598 | return 0; | |
3599 | ||
3600 | if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { | |
3601 | switch (skb->csum_offset) { | |
3602 | case offsetof(struct tcphdr, check): | |
3603 | case offsetof(struct udphdr, check): | |
3604 | return 0; | |
3605 | } | |
3606 | } | |
3607 | ||
3608 | return skb_checksum_help(skb); | |
43c26a1a DC |
3609 | } |
3610 | EXPORT_SYMBOL(skb_csum_hwoffload_help); | |
3611 | ||
f53c7239 | 3612 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again) |
eae3f88e DM |
3613 | { |
3614 | netdev_features_t features; | |
f6a78bfc | 3615 | |
eae3f88e DM |
3616 | features = netif_skb_features(skb); |
3617 | skb = validate_xmit_vlan(skb, features); | |
3618 | if (unlikely(!skb)) | |
3619 | goto out_null; | |
7b9c6090 | 3620 | |
ebf4e808 IL |
3621 | skb = sk_validate_xmit_skb(skb, dev); |
3622 | if (unlikely(!skb)) | |
3623 | goto out_null; | |
3624 | ||
8b86a61d | 3625 | if (netif_needs_gso(skb, features)) { |
ce93718f DM |
3626 | struct sk_buff *segs; |
3627 | ||
3628 | segs = skb_gso_segment(skb, features); | |
cecda693 | 3629 | if (IS_ERR(segs)) { |
af6dabc9 | 3630 | goto out_kfree_skb; |
cecda693 JW |
3631 | } else if (segs) { |
3632 | consume_skb(skb); | |
3633 | skb = segs; | |
f6a78bfc | 3634 | } |
eae3f88e DM |
3635 | } else { |
3636 | if (skb_needs_linearize(skb, features) && | |
3637 | __skb_linearize(skb)) | |
3638 | goto out_kfree_skb; | |
4ec93edb | 3639 | |
eae3f88e DM |
3640 | /* If packet is not checksummed and device does not |
3641 | * support checksumming for this protocol, complete | |
3642 | * checksumming here. | |
3643 | */ | |
3644 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
3645 | if (skb->encapsulation) | |
3646 | skb_set_inner_transport_header(skb, | |
3647 | skb_checksum_start_offset(skb)); | |
3648 | else | |
3649 | skb_set_transport_header(skb, | |
3650 | skb_checksum_start_offset(skb)); | |
43c26a1a | 3651 | if (skb_csum_hwoffload_help(skb, features)) |
eae3f88e | 3652 | goto out_kfree_skb; |
7b9c6090 | 3653 | } |
0c772159 | 3654 | } |
7b9c6090 | 3655 | |
f53c7239 | 3656 | skb = validate_xmit_xfrm(skb, features, again); |
3dca3f38 | 3657 | |
eae3f88e | 3658 | return skb; |
fc70fb64 | 3659 | |
f6a78bfc HX |
3660 | out_kfree_skb: |
3661 | kfree_skb(skb); | |
eae3f88e | 3662 | out_null: |
625788b5 | 3663 | dev_core_stats_tx_dropped_inc(dev); |
eae3f88e DM |
3664 | return NULL; |
3665 | } | |
6afff0ca | 3666 | |
f53c7239 | 3667 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again) |
55a93b3e ED |
3668 | { |
3669 | struct sk_buff *next, *head = NULL, *tail; | |
3670 | ||
bec3cfdc | 3671 | for (; skb != NULL; skb = next) { |
55a93b3e | 3672 | next = skb->next; |
a8305bff | 3673 | skb_mark_not_on_list(skb); |
bec3cfdc ED |
3674 | |
3675 | /* in case skb wont be segmented, point to itself */ | |
3676 | skb->prev = skb; | |
3677 | ||
f53c7239 | 3678 | skb = validate_xmit_skb(skb, dev, again); |
bec3cfdc ED |
3679 | if (!skb) |
3680 | continue; | |
55a93b3e | 3681 | |
bec3cfdc ED |
3682 | if (!head) |
3683 | head = skb; | |
3684 | else | |
3685 | tail->next = skb; | |
3686 | /* If skb was segmented, skb->prev points to | |
3687 | * the last segment. If not, it still contains skb. | |
3688 | */ | |
3689 | tail = skb->prev; | |
55a93b3e ED |
3690 | } |
3691 | return head; | |
f6a78bfc | 3692 | } |
104ba78c | 3693 | EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
f6a78bfc | 3694 | |
1def9238 ED |
3695 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
3696 | { | |
3697 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
3698 | ||
3699 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
3700 | ||
3701 | /* To get more precise estimation of bytes sent on wire, | |
3702 | * we add to pkt_len the headers size of all segments | |
3703 | */ | |
a0dce875 | 3704 | if (shinfo->gso_size && skb_transport_header_was_set(skb)) { |
15e5a030 | 3705 | u16 gso_segs = shinfo->gso_segs; |
f5fca219 | 3706 | unsigned int hdr_len; |
1def9238 | 3707 | |
757b8b1d | 3708 | /* mac layer + network layer */ |
f5fca219 | 3709 | hdr_len = skb_transport_offset(skb); |
757b8b1d ED |
3710 | |
3711 | /* + transport layer */ | |
7c68d1a6 ED |
3712 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { |
3713 | const struct tcphdr *th; | |
3714 | struct tcphdr _tcphdr; | |
3715 | ||
f5fca219 | 3716 | th = skb_header_pointer(skb, hdr_len, |
7c68d1a6 ED |
3717 | sizeof(_tcphdr), &_tcphdr); |
3718 | if (likely(th)) | |
3719 | hdr_len += __tcp_hdrlen(th); | |
3720 | } else { | |
3721 | struct udphdr _udphdr; | |
3722 | ||
f5fca219 | 3723 | if (skb_header_pointer(skb, hdr_len, |
7c68d1a6 ED |
3724 | sizeof(_udphdr), &_udphdr)) |
3725 | hdr_len += sizeof(struct udphdr); | |
3726 | } | |
15e5a030 JW |
3727 | |
3728 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
3729 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
3730 | shinfo->gso_size); | |
3731 | ||
3732 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
3733 | } |
3734 | } | |
3735 | ||
70713ddd QX |
3736 | static int dev_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *q, |
3737 | struct sk_buff **to_free, | |
3738 | struct netdev_queue *txq) | |
3739 | { | |
3740 | int rc; | |
3741 | ||
3742 | rc = q->enqueue(skb, q, to_free) & NET_XMIT_MASK; | |
3743 | if (rc == NET_XMIT_SUCCESS) | |
3744 | trace_qdisc_enqueue(q, txq, skb); | |
3745 | return rc; | |
3746 | } | |
3747 | ||
bbd8a0d3 KK |
3748 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
3749 | struct net_device *dev, | |
3750 | struct netdev_queue *txq) | |
3751 | { | |
3752 | spinlock_t *root_lock = qdisc_lock(q); | |
520ac30f | 3753 | struct sk_buff *to_free = NULL; |
a2da570d | 3754 | bool contended; |
bbd8a0d3 KK |
3755 | int rc; |
3756 | ||
a2da570d | 3757 | qdisc_calculate_pkt_len(skb, q); |
6b3ba914 | 3758 | |
b6a3c606 VN |
3759 | tcf_set_drop_reason(skb, SKB_DROP_REASON_QDISC_DROP); |
3760 | ||
6b3ba914 | 3761 | if (q->flags & TCQ_F_NOLOCK) { |
c4fef01b YL |
3762 | if (q->flags & TCQ_F_CAN_BYPASS && nolock_qdisc_is_empty(q) && |
3763 | qdisc_run_begin(q)) { | |
3764 | /* Retest nolock_qdisc_is_empty() within the protection | |
3765 | * of q->seqlock to protect from racing with requeuing. | |
3766 | */ | |
3767 | if (unlikely(!nolock_qdisc_is_empty(q))) { | |
70713ddd | 3768 | rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
c4fef01b YL |
3769 | __qdisc_run(q); |
3770 | qdisc_run_end(q); | |
3771 | ||
3772 | goto no_lock_out; | |
3773 | } | |
3774 | ||
3775 | qdisc_bstats_cpu_update(q, skb); | |
3776 | if (sch_direct_xmit(skb, q, dev, txq, NULL, true) && | |
3777 | !nolock_qdisc_is_empty(q)) | |
3778 | __qdisc_run(q); | |
3779 | ||
3780 | qdisc_run_end(q); | |
3781 | return NET_XMIT_SUCCESS; | |
3782 | } | |
3783 | ||
70713ddd | 3784 | rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
c4fef01b | 3785 | qdisc_run(q); |
6b3ba914 | 3786 | |
c4fef01b | 3787 | no_lock_out: |
6b3ba914 | 3788 | if (unlikely(to_free)) |
7faef054 | 3789 | kfree_skb_list_reason(to_free, |
b6a3c606 | 3790 | tcf_get_drop_reason(to_free)); |
6b3ba914 JF |
3791 | return rc; |
3792 | } | |
3793 | ||
79640a4c ED |
3794 | /* |
3795 | * Heuristic to force contended enqueues to serialize on a | |
3796 | * separate lock before trying to get qdisc main lock. | |
f9eb8aea | 3797 | * This permits qdisc->running owner to get the lock more |
9bf2b8c2 | 3798 | * often and dequeue packets faster. |
64445dda SAS |
3799 | * On PREEMPT_RT it is possible to preempt the qdisc owner during xmit |
3800 | * and then other tasks will only enqueue packets. The packets will be | |
3801 | * sent after the qdisc owner is scheduled again. To prevent this | |
3802 | * scenario the task always serialize on the lock. | |
79640a4c | 3803 | */ |
a9aa5e33 | 3804 | contended = qdisc_is_running(q) || IS_ENABLED(CONFIG_PREEMPT_RT); |
79640a4c ED |
3805 | if (unlikely(contended)) |
3806 | spin_lock(&q->busylock); | |
3807 | ||
bbd8a0d3 KK |
3808 | spin_lock(root_lock); |
3809 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
520ac30f | 3810 | __qdisc_drop(skb, &to_free); |
bbd8a0d3 KK |
3811 | rc = NET_XMIT_DROP; |
3812 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 3813 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
3814 | /* |
3815 | * This is a work-conserving queue; there are no old skbs | |
3816 | * waiting to be sent out; and the qdisc is not running - | |
3817 | * xmit the skb directly. | |
3818 | */ | |
bfe0d029 | 3819 | |
bfe0d029 ED |
3820 | qdisc_bstats_update(q, skb); |
3821 | ||
55a93b3e | 3822 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
3823 | if (unlikely(contended)) { |
3824 | spin_unlock(&q->busylock); | |
3825 | contended = false; | |
3826 | } | |
bbd8a0d3 | 3827 | __qdisc_run(q); |
6c148184 | 3828 | } |
bbd8a0d3 | 3829 | |
6c148184 | 3830 | qdisc_run_end(q); |
bbd8a0d3 KK |
3831 | rc = NET_XMIT_SUCCESS; |
3832 | } else { | |
70713ddd | 3833 | rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
79640a4c ED |
3834 | if (qdisc_run_begin(q)) { |
3835 | if (unlikely(contended)) { | |
3836 | spin_unlock(&q->busylock); | |
3837 | contended = false; | |
3838 | } | |
3839 | __qdisc_run(q); | |
6c148184 | 3840 | qdisc_run_end(q); |
79640a4c | 3841 | } |
bbd8a0d3 KK |
3842 | } |
3843 | spin_unlock(root_lock); | |
520ac30f | 3844 | if (unlikely(to_free)) |
b6a3c606 VN |
3845 | kfree_skb_list_reason(to_free, |
3846 | tcf_get_drop_reason(to_free)); | |
79640a4c ED |
3847 | if (unlikely(contended)) |
3848 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
3849 | return rc; |
3850 | } | |
3851 | ||
86f8515f | 3852 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
3853 | static void skb_update_prio(struct sk_buff *skb) |
3854 | { | |
4dcb31d4 ED |
3855 | const struct netprio_map *map; |
3856 | const struct sock *sk; | |
3857 | unsigned int prioidx; | |
5bc1421e | 3858 | |
4dcb31d4 ED |
3859 | if (skb->priority) |
3860 | return; | |
3861 | map = rcu_dereference_bh(skb->dev->priomap); | |
3862 | if (!map) | |
3863 | return; | |
3864 | sk = skb_to_full_sk(skb); | |
3865 | if (!sk) | |
3866 | return; | |
91c68ce2 | 3867 | |
4dcb31d4 ED |
3868 | prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data); |
3869 | ||
3870 | if (prioidx < map->priomap_len) | |
3871 | skb->priority = map->priomap[prioidx]; | |
5bc1421e NH |
3872 | } |
3873 | #else | |
3874 | #define skb_update_prio(skb) | |
3875 | #endif | |
3876 | ||
95603e22 MM |
3877 | /** |
3878 | * dev_loopback_xmit - loop back @skb | |
0c4b51f0 EB |
3879 | * @net: network namespace this loopback is happening in |
3880 | * @sk: sk needed to be a netfilter okfn | |
95603e22 MM |
3881 | * @skb: buffer to transmit |
3882 | */ | |
0c4b51f0 | 3883 | int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
3884 | { |
3885 | skb_reset_mac_header(skb); | |
3886 | __skb_pull(skb, skb_network_offset(skb)); | |
3887 | skb->pkt_type = PACKET_LOOPBACK; | |
9122a70a CS |
3888 | if (skb->ip_summed == CHECKSUM_NONE) |
3889 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
76458fae | 3890 | DEBUG_NET_WARN_ON_ONCE(!skb_dst(skb)); |
95603e22 | 3891 | skb_dst_force(skb); |
ad0a043f | 3892 | netif_rx(skb); |
95603e22 MM |
3893 | return 0; |
3894 | } | |
3895 | EXPORT_SYMBOL(dev_loopback_xmit); | |
3896 | ||
1f211a1b | 3897 | #ifdef CONFIG_NET_EGRESS |
e420bed0 DB |
3898 | static struct netdev_queue * |
3899 | netdev_tx_queue_mapping(struct net_device *dev, struct sk_buff *skb) | |
3900 | { | |
3901 | int qm = skb_get_queue_mapping(skb); | |
3902 | ||
3903 | return netdev_get_tx_queue(dev, netdev_cap_txqueue(dev, qm)); | |
3904 | } | |
3905 | ||
3906 | static bool netdev_xmit_txqueue_skipped(void) | |
1f211a1b | 3907 | { |
e420bed0 DB |
3908 | return __this_cpu_read(softnet_data.xmit.skip_txqueue); |
3909 | } | |
3910 | ||
3911 | void netdev_xmit_skip_txqueue(bool skip) | |
3912 | { | |
3913 | __this_cpu_write(softnet_data.xmit.skip_txqueue, skip); | |
3914 | } | |
3915 | EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue); | |
3916 | #endif /* CONFIG_NET_EGRESS */ | |
3917 | ||
3918 | #ifdef CONFIG_NET_XGRESS | |
54a59aed DB |
3919 | static int tc_run(struct tcx_entry *entry, struct sk_buff *skb, |
3920 | enum skb_drop_reason *drop_reason) | |
e420bed0 DB |
3921 | { |
3922 | int ret = TC_ACT_UNSPEC; | |
42df6e1d | 3923 | #ifdef CONFIG_NET_CLS_ACT |
e420bed0 DB |
3924 | struct mini_Qdisc *miniq = rcu_dereference_bh(entry->miniq); |
3925 | struct tcf_result res; | |
1f211a1b | 3926 | |
46209401 | 3927 | if (!miniq) |
e420bed0 | 3928 | return ret; |
1f211a1b | 3929 | |
ec624fe7 PB |
3930 | tc_skb_cb(skb)->mru = 0; |
3931 | tc_skb_cb(skb)->post_ct = false; | |
fb278072 | 3932 | tcf_set_drop_reason(skb, *drop_reason); |
1f211a1b | 3933 | |
e420bed0 DB |
3934 | mini_qdisc_bstats_cpu_update(miniq, skb); |
3935 | ret = tcf_classify(skb, miniq->block, miniq->filter_list, &res, false); | |
3936 | /* Only tcf related quirks below. */ | |
3937 | switch (ret) { | |
3938 | case TC_ACT_SHOT: | |
fb278072 | 3939 | *drop_reason = tcf_get_drop_reason(skb); |
e420bed0 DB |
3940 | mini_qdisc_qstats_cpu_drop(miniq); |
3941 | break; | |
1f211a1b DB |
3942 | case TC_ACT_OK: |
3943 | case TC_ACT_RECLASSIFY: | |
e420bed0 | 3944 | skb->tc_index = TC_H_MIN(res.classid); |
1f211a1b | 3945 | break; |
e420bed0 DB |
3946 | } |
3947 | #endif /* CONFIG_NET_CLS_ACT */ | |
3948 | return ret; | |
3949 | } | |
3950 | ||
3951 | static DEFINE_STATIC_KEY_FALSE(tcx_needed_key); | |
3952 | ||
3953 | void tcx_inc(void) | |
3954 | { | |
3955 | static_branch_inc(&tcx_needed_key); | |
3956 | } | |
3957 | ||
3958 | void tcx_dec(void) | |
3959 | { | |
3960 | static_branch_dec(&tcx_needed_key); | |
3961 | } | |
3962 | ||
3963 | static __always_inline enum tcx_action_base | |
3964 | tcx_run(const struct bpf_mprog_entry *entry, struct sk_buff *skb, | |
3965 | const bool needs_mac) | |
3966 | { | |
3967 | const struct bpf_mprog_fp *fp; | |
3968 | const struct bpf_prog *prog; | |
3969 | int ret = TCX_NEXT; | |
3970 | ||
3971 | if (needs_mac) | |
3972 | __skb_push(skb, skb->mac_len); | |
3973 | bpf_mprog_foreach_prog(entry, fp, prog) { | |
3974 | bpf_compute_data_pointers(skb); | |
3975 | ret = bpf_prog_run(prog, skb); | |
3976 | if (ret != TCX_NEXT) | |
3977 | break; | |
3978 | } | |
3979 | if (needs_mac) | |
3980 | __skb_pull(skb, skb->mac_len); | |
3981 | return tcx_action_code(skb, ret); | |
3982 | } | |
3983 | ||
3984 | static __always_inline struct sk_buff * | |
3985 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
3986 | struct net_device *orig_dev, bool *another) | |
3987 | { | |
3988 | struct bpf_mprog_entry *entry = rcu_dereference_bh(skb->dev->tcx_ingress); | |
54a59aed | 3989 | enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_INGRESS; |
e420bed0 DB |
3990 | int sch_ret; |
3991 | ||
3992 | if (!entry) | |
3993 | return skb; | |
3994 | if (*pt_prev) { | |
3995 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3996 | *pt_prev = NULL; | |
3997 | } | |
3998 | ||
3999 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
4000 | tcx_set_ingress(skb, true); | |
4001 | ||
4002 | if (static_branch_unlikely(&tcx_needed_key)) { | |
4003 | sch_ret = tcx_run(entry, skb, true); | |
4004 | if (sch_ret != TC_ACT_UNSPEC) | |
4005 | goto ingress_verdict; | |
4006 | } | |
54a59aed | 4007 | sch_ret = tc_run(tcx_entry(entry), skb, &drop_reason); |
e420bed0 DB |
4008 | ingress_verdict: |
4009 | switch (sch_ret) { | |
4010 | case TC_ACT_REDIRECT: | |
4011 | /* skb_mac_header check was done by BPF, so we can safely | |
4012 | * push the L2 header back before redirecting to another | |
4013 | * netdev. | |
4014 | */ | |
4015 | __skb_push(skb, skb->mac_len); | |
4016 | if (skb_do_redirect(skb) == -EAGAIN) { | |
4017 | __skb_pull(skb, skb->mac_len); | |
4018 | *another = true; | |
4019 | break; | |
4020 | } | |
4021 | *ret = NET_RX_SUCCESS; | |
4022 | return NULL; | |
1f211a1b | 4023 | case TC_ACT_SHOT: |
54a59aed | 4024 | kfree_skb_reason(skb, drop_reason); |
e420bed0 | 4025 | *ret = NET_RX_DROP; |
7e2c3aea | 4026 | return NULL; |
e420bed0 | 4027 | /* used by tc_run */ |
1f211a1b DB |
4028 | case TC_ACT_STOLEN: |
4029 | case TC_ACT_QUEUED: | |
e25ea21f | 4030 | case TC_ACT_TRAP: |
7e2c3aea | 4031 | consume_skb(skb); |
e420bed0 DB |
4032 | fallthrough; |
4033 | case TC_ACT_CONSUMED: | |
4034 | *ret = NET_RX_SUCCESS; | |
1f211a1b | 4035 | return NULL; |
e420bed0 DB |
4036 | } |
4037 | ||
4038 | return skb; | |
4039 | } | |
4040 | ||
4041 | static __always_inline struct sk_buff * | |
4042 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
4043 | { | |
4044 | struct bpf_mprog_entry *entry = rcu_dereference_bh(dev->tcx_egress); | |
54a59aed | 4045 | enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_EGRESS; |
e420bed0 DB |
4046 | int sch_ret; |
4047 | ||
4048 | if (!entry) | |
4049 | return skb; | |
4050 | ||
4051 | /* qdisc_skb_cb(skb)->pkt_len & tcx_set_ingress() was | |
4052 | * already set by the caller. | |
4053 | */ | |
4054 | if (static_branch_unlikely(&tcx_needed_key)) { | |
4055 | sch_ret = tcx_run(entry, skb, false); | |
4056 | if (sch_ret != TC_ACT_UNSPEC) | |
4057 | goto egress_verdict; | |
4058 | } | |
54a59aed | 4059 | sch_ret = tc_run(tcx_entry(entry), skb, &drop_reason); |
e420bed0 DB |
4060 | egress_verdict: |
4061 | switch (sch_ret) { | |
1f211a1b DB |
4062 | case TC_ACT_REDIRECT: |
4063 | /* No need to push/pop skb's mac_header here on egress! */ | |
4064 | skb_do_redirect(skb); | |
4065 | *ret = NET_XMIT_SUCCESS; | |
4066 | return NULL; | |
e420bed0 | 4067 | case TC_ACT_SHOT: |
54a59aed | 4068 | kfree_skb_reason(skb, drop_reason); |
e420bed0 DB |
4069 | *ret = NET_XMIT_DROP; |
4070 | return NULL; | |
4071 | /* used by tc_run */ | |
4072 | case TC_ACT_STOLEN: | |
4073 | case TC_ACT_QUEUED: | |
4074 | case TC_ACT_TRAP: | |
28d18b67 | 4075 | consume_skb(skb); |
3a1e2f43 DB |
4076 | fallthrough; |
4077 | case TC_ACT_CONSUMED: | |
e420bed0 DB |
4078 | *ret = NET_XMIT_SUCCESS; |
4079 | return NULL; | |
1f211a1b | 4080 | } |
357b6cc5 | 4081 | |
1f211a1b DB |
4082 | return skb; |
4083 | } | |
e420bed0 DB |
4084 | #else |
4085 | static __always_inline struct sk_buff * | |
4086 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
4087 | struct net_device *orig_dev, bool *another) | |
2f1e85b1 | 4088 | { |
e420bed0 | 4089 | return skb; |
2f1e85b1 TZ |
4090 | } |
4091 | ||
e420bed0 DB |
4092 | static __always_inline struct sk_buff * |
4093 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
2f1e85b1 | 4094 | { |
e420bed0 | 4095 | return skb; |
2f1e85b1 | 4096 | } |
e420bed0 | 4097 | #endif /* CONFIG_NET_XGRESS */ |
1f211a1b | 4098 | |
fc9bab24 AN |
4099 | #ifdef CONFIG_XPS |
4100 | static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, | |
4101 | struct xps_dev_maps *dev_maps, unsigned int tci) | |
4102 | { | |
255c04a8 | 4103 | int tc = netdev_get_prio_tc_map(dev, skb->priority); |
fc9bab24 AN |
4104 | struct xps_map *map; |
4105 | int queue_index = -1; | |
4106 | ||
5478fcd0 | 4107 | if (tc >= dev_maps->num_tc || tci >= dev_maps->nr_ids) |
255c04a8 AT |
4108 | return queue_index; |
4109 | ||
4110 | tci *= dev_maps->num_tc; | |
4111 | tci += tc; | |
fc9bab24 AN |
4112 | |
4113 | map = rcu_dereference(dev_maps->attr_map[tci]); | |
4114 | if (map) { | |
4115 | if (map->len == 1) | |
4116 | queue_index = map->queues[0]; | |
4117 | else | |
4118 | queue_index = map->queues[reciprocal_scale( | |
4119 | skb_get_hash(skb), map->len)]; | |
4120 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
4121 | queue_index = -1; | |
4122 | } | |
4123 | return queue_index; | |
4124 | } | |
4125 | #endif | |
4126 | ||
eadec877 AD |
4127 | static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev, |
4128 | struct sk_buff *skb) | |
638b2a69 JP |
4129 | { |
4130 | #ifdef CONFIG_XPS | |
4131 | struct xps_dev_maps *dev_maps; | |
fc9bab24 | 4132 | struct sock *sk = skb->sk; |
638b2a69 JP |
4133 | int queue_index = -1; |
4134 | ||
04157469 AN |
4135 | if (!static_key_false(&xps_needed)) |
4136 | return -1; | |
4137 | ||
638b2a69 | 4138 | rcu_read_lock(); |
fc9bab24 AN |
4139 | if (!static_key_false(&xps_rxqs_needed)) |
4140 | goto get_cpus_map; | |
4141 | ||
044ab86d | 4142 | dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_RXQS]); |
638b2a69 | 4143 | if (dev_maps) { |
fc9bab24 | 4144 | int tci = sk_rx_queue_get(sk); |
184c449f | 4145 | |
5478fcd0 | 4146 | if (tci >= 0) |
fc9bab24 AN |
4147 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, |
4148 | tci); | |
4149 | } | |
184c449f | 4150 | |
fc9bab24 AN |
4151 | get_cpus_map: |
4152 | if (queue_index < 0) { | |
044ab86d | 4153 | dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_CPUS]); |
fc9bab24 AN |
4154 | if (dev_maps) { |
4155 | unsigned int tci = skb->sender_cpu - 1; | |
4156 | ||
4157 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
4158 | tci); | |
638b2a69 JP |
4159 | } |
4160 | } | |
4161 | rcu_read_unlock(); | |
4162 | ||
4163 | return queue_index; | |
4164 | #else | |
4165 | return -1; | |
4166 | #endif | |
4167 | } | |
4168 | ||
a4ea8a3d | 4169 | u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, |
a350ecce | 4170 | struct net_device *sb_dev) |
a4ea8a3d AD |
4171 | { |
4172 | return 0; | |
4173 | } | |
4174 | EXPORT_SYMBOL(dev_pick_tx_zero); | |
4175 | ||
4176 | u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, | |
a350ecce | 4177 | struct net_device *sb_dev) |
a4ea8a3d AD |
4178 | { |
4179 | return (u16)raw_smp_processor_id() % dev->real_num_tx_queues; | |
4180 | } | |
4181 | EXPORT_SYMBOL(dev_pick_tx_cpu_id); | |
4182 | ||
b71b5837 PA |
4183 | u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, |
4184 | struct net_device *sb_dev) | |
638b2a69 JP |
4185 | { |
4186 | struct sock *sk = skb->sk; | |
4187 | int queue_index = sk_tx_queue_get(sk); | |
4188 | ||
eadec877 AD |
4189 | sb_dev = sb_dev ? : dev; |
4190 | ||
638b2a69 JP |
4191 | if (queue_index < 0 || skb->ooo_okay || |
4192 | queue_index >= dev->real_num_tx_queues) { | |
eadec877 | 4193 | int new_index = get_xps_queue(dev, sb_dev, skb); |
f4563a75 | 4194 | |
638b2a69 | 4195 | if (new_index < 0) |
eadec877 | 4196 | new_index = skb_tx_hash(dev, sb_dev, skb); |
638b2a69 JP |
4197 | |
4198 | if (queue_index != new_index && sk && | |
004a5d01 | 4199 | sk_fullsock(sk) && |
638b2a69 JP |
4200 | rcu_access_pointer(sk->sk_dst_cache)) |
4201 | sk_tx_queue_set(sk, new_index); | |
4202 | ||
4203 | queue_index = new_index; | |
4204 | } | |
4205 | ||
4206 | return queue_index; | |
4207 | } | |
b71b5837 | 4208 | EXPORT_SYMBOL(netdev_pick_tx); |
638b2a69 | 4209 | |
4bd97d51 PA |
4210 | struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, |
4211 | struct sk_buff *skb, | |
4212 | struct net_device *sb_dev) | |
638b2a69 JP |
4213 | { |
4214 | int queue_index = 0; | |
4215 | ||
4216 | #ifdef CONFIG_XPS | |
52bd2d62 ED |
4217 | u32 sender_cpu = skb->sender_cpu - 1; |
4218 | ||
4219 | if (sender_cpu >= (u32)NR_CPUS) | |
638b2a69 JP |
4220 | skb->sender_cpu = raw_smp_processor_id() + 1; |
4221 | #endif | |
4222 | ||
4223 | if (dev->real_num_tx_queues != 1) { | |
4224 | const struct net_device_ops *ops = dev->netdev_ops; | |
f4563a75 | 4225 | |
638b2a69 | 4226 | if (ops->ndo_select_queue) |
a350ecce | 4227 | queue_index = ops->ndo_select_queue(dev, skb, sb_dev); |
638b2a69 | 4228 | else |
4bd97d51 | 4229 | queue_index = netdev_pick_tx(dev, skb, sb_dev); |
638b2a69 | 4230 | |
d584527c | 4231 | queue_index = netdev_cap_txqueue(dev, queue_index); |
638b2a69 JP |
4232 | } |
4233 | ||
4234 | skb_set_queue_mapping(skb, queue_index); | |
4235 | return netdev_get_tx_queue(dev, queue_index); | |
4236 | } | |
4237 | ||
d29f749e | 4238 | /** |
be76955d JK |
4239 | * __dev_queue_xmit() - transmit a buffer |
4240 | * @skb: buffer to transmit | |
4241 | * @sb_dev: suboordinate device used for L2 forwarding offload | |
d29f749e | 4242 | * |
be76955d JK |
4243 | * Queue a buffer for transmission to a network device. The caller must |
4244 | * have set the device and priority and built the buffer before calling | |
4245 | * this function. The function can be called from an interrupt. | |
d29f749e | 4246 | * |
be76955d JK |
4247 | * When calling this method, interrupts MUST be enabled. This is because |
4248 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
d29f749e | 4249 | * |
be76955d JK |
4250 | * Regardless of the return value, the skb is consumed, so it is currently |
4251 | * difficult to retry a send to this method. (You can bump the ref count | |
4252 | * before sending to hold a reference for retry if you are careful.) | |
d29f749e | 4253 | * |
be76955d JK |
4254 | * Return: |
4255 | * * 0 - buffer successfully transmitted | |
4256 | * * positive qdisc return code - NET_XMIT_DROP etc. | |
4257 | * * negative errno - other errors | |
d29f749e | 4258 | */ |
c526fd8f | 4259 | int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev) |
1da177e4 LT |
4260 | { |
4261 | struct net_device *dev = skb->dev; | |
2f1e85b1 | 4262 | struct netdev_queue *txq = NULL; |
1da177e4 LT |
4263 | struct Qdisc *q; |
4264 | int rc = -ENOMEM; | |
f53c7239 | 4265 | bool again = false; |
1da177e4 | 4266 | |
6d1ccff6 | 4267 | skb_reset_mac_header(skb); |
fd189422 | 4268 | skb_assert_len(skb); |
6d1ccff6 | 4269 | |
e7fd2885 | 4270 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
e7ed11ee | 4271 | __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED); |
e7fd2885 | 4272 | |
4ec93edb YH |
4273 | /* Disable soft irqs for various locks below. Also |
4274 | * stops preemption for RCU. | |
1da177e4 | 4275 | */ |
4ec93edb | 4276 | rcu_read_lock_bh(); |
1da177e4 | 4277 | |
5bc1421e NH |
4278 | skb_update_prio(skb); |
4279 | ||
1f211a1b | 4280 | qdisc_pkt_len_init(skb); |
e420bed0 | 4281 | tcx_set_ingress(skb, false); |
42df6e1d | 4282 | #ifdef CONFIG_NET_EGRESS |
aabf6772 | 4283 | if (static_branch_unlikely(&egress_needed_key)) { |
42df6e1d LW |
4284 | if (nf_hook_egress_active()) { |
4285 | skb = nf_hook_egress(skb, &rc, dev); | |
4286 | if (!skb) | |
4287 | goto out; | |
4288 | } | |
2f1e85b1 TZ |
4289 | |
4290 | netdev_xmit_skip_txqueue(false); | |
4291 | ||
42df6e1d | 4292 | nf_skip_egress(skb, true); |
1f211a1b DB |
4293 | skb = sch_handle_egress(skb, &rc, dev); |
4294 | if (!skb) | |
4295 | goto out; | |
42df6e1d | 4296 | nf_skip_egress(skb, false); |
2f1e85b1 TZ |
4297 | |
4298 | if (netdev_xmit_txqueue_skipped()) | |
4299 | txq = netdev_tx_queue_mapping(dev, skb); | |
1f211a1b | 4300 | } |
1f211a1b | 4301 | #endif |
02875878 ED |
4302 | /* If device/qdisc don't need skb->dst, release it right now while |
4303 | * its hot in this cpu cache. | |
4304 | */ | |
4305 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
4306 | skb_dst_drop(skb); | |
4307 | else | |
4308 | skb_dst_force(skb); | |
4309 | ||
2f1e85b1 TZ |
4310 | if (!txq) |
4311 | txq = netdev_core_pick_tx(dev, skb, sb_dev); | |
4312 | ||
a898def2 | 4313 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 4314 | |
cf66ba58 | 4315 | trace_net_dev_queue(skb); |
1da177e4 | 4316 | if (q->enqueue) { |
bbd8a0d3 | 4317 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 4318 | goto out; |
1da177e4 LT |
4319 | } |
4320 | ||
4321 | /* The device has no queue. Common case for software devices: | |
eb13da1a | 4322 | * loopback, all the sorts of tunnels... |
1da177e4 | 4323 | |
eb13da1a | 4324 | * Really, it is unlikely that netif_tx_lock protection is necessary |
4325 | * here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
4326 | * counters.) | |
4327 | * However, it is possible, that they rely on protection | |
4328 | * made by us here. | |
1da177e4 | 4329 | |
eb13da1a | 4330 | * Check this and shot the lock. It is not prone from deadlocks. |
4331 | *Either shot noqueue qdisc, it is even simpler 8) | |
1da177e4 LT |
4332 | */ |
4333 | if (dev->flags & IFF_UP) { | |
4334 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
4335 | ||
7a10d8c8 ED |
4336 | /* Other cpus might concurrently change txq->xmit_lock_owner |
4337 | * to -1 or to their cpu id, but not to our id. | |
4338 | */ | |
4339 | if (READ_ONCE(txq->xmit_lock_owner) != cpu) { | |
97cdcf37 | 4340 | if (dev_xmit_recursion()) |
745e20f1 ED |
4341 | goto recursion_alert; |
4342 | ||
f53c7239 | 4343 | skb = validate_xmit_skb(skb, dev, &again); |
1f59533f | 4344 | if (!skb) |
d21fd63e | 4345 | goto out; |
1f59533f | 4346 | |
c773e847 | 4347 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 4348 | |
73466498 | 4349 | if (!netif_xmit_stopped(txq)) { |
97cdcf37 | 4350 | dev_xmit_recursion_inc(); |
ce93718f | 4351 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
97cdcf37 | 4352 | dev_xmit_recursion_dec(); |
572a9d7b | 4353 | if (dev_xmit_complete(rc)) { |
c773e847 | 4354 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
4355 | goto out; |
4356 | } | |
4357 | } | |
c773e847 | 4358 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
4359 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
4360 | dev->name); | |
1da177e4 LT |
4361 | } else { |
4362 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
4363 | * unfortunately |
4364 | */ | |
4365 | recursion_alert: | |
e87cc472 JP |
4366 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
4367 | dev->name); | |
1da177e4 LT |
4368 | } |
4369 | } | |
4370 | ||
4371 | rc = -ENETDOWN; | |
d4828d85 | 4372 | rcu_read_unlock_bh(); |
1da177e4 | 4373 | |
625788b5 | 4374 | dev_core_stats_tx_dropped_inc(dev); |
1f59533f | 4375 | kfree_skb_list(skb); |
1da177e4 LT |
4376 | return rc; |
4377 | out: | |
d4828d85 | 4378 | rcu_read_unlock_bh(); |
1da177e4 LT |
4379 | return rc; |
4380 | } | |
c526fd8f | 4381 | EXPORT_SYMBOL(__dev_queue_xmit); |
f663dd9a | 4382 | |
36ccdf85 | 4383 | int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id) |
865b03f2 MK |
4384 | { |
4385 | struct net_device *dev = skb->dev; | |
4386 | struct sk_buff *orig_skb = skb; | |
4387 | struct netdev_queue *txq; | |
4388 | int ret = NETDEV_TX_BUSY; | |
4389 | bool again = false; | |
4390 | ||
4391 | if (unlikely(!netif_running(dev) || | |
4392 | !netif_carrier_ok(dev))) | |
4393 | goto drop; | |
4394 | ||
4395 | skb = validate_xmit_skb_list(skb, dev, &again); | |
4396 | if (skb != orig_skb) | |
4397 | goto drop; | |
4398 | ||
4399 | skb_set_queue_mapping(skb, queue_id); | |
4400 | txq = skb_get_tx_queue(dev, skb); | |
4401 | ||
4402 | local_bh_disable(); | |
4403 | ||
0ad6f6e7 | 4404 | dev_xmit_recursion_inc(); |
865b03f2 MK |
4405 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
4406 | if (!netif_xmit_frozen_or_drv_stopped(txq)) | |
4407 | ret = netdev_start_xmit(skb, dev, txq, false); | |
4408 | HARD_TX_UNLOCK(dev, txq); | |
0ad6f6e7 | 4409 | dev_xmit_recursion_dec(); |
865b03f2 MK |
4410 | |
4411 | local_bh_enable(); | |
865b03f2 MK |
4412 | return ret; |
4413 | drop: | |
625788b5 | 4414 | dev_core_stats_tx_dropped_inc(dev); |
865b03f2 MK |
4415 | kfree_skb_list(skb); |
4416 | return NET_XMIT_DROP; | |
4417 | } | |
36ccdf85 | 4418 | EXPORT_SYMBOL(__dev_direct_xmit); |
1da177e4 | 4419 | |
eb13da1a | 4420 | /************************************************************************* |
4421 | * Receiver routines | |
4422 | *************************************************************************/ | |
1da177e4 | 4423 | |
6b2bedc3 | 4424 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
4425 | EXPORT_SYMBOL(netdev_max_backlog); |
4426 | ||
3b098e2d | 4427 | int netdev_tstamp_prequeue __read_mostly = 1; |
39564c3f | 4428 | unsigned int sysctl_skb_defer_max __read_mostly = 64; |
6b2bedc3 | 4429 | int netdev_budget __read_mostly = 300; |
a4837980 KK |
4430 | /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */ |
4431 | unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ; | |
3d48b53f MT |
4432 | int weight_p __read_mostly = 64; /* old backlog weight */ |
4433 | int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ | |
4434 | int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ | |
4435 | int dev_rx_weight __read_mostly = 64; | |
4436 | int dev_tx_weight __read_mostly = 64; | |
1da177e4 | 4437 | |
eecfd7c4 ED |
4438 | /* Called with irq disabled */ |
4439 | static inline void ____napi_schedule(struct softnet_data *sd, | |
4440 | struct napi_struct *napi) | |
4441 | { | |
29863d41 WW |
4442 | struct task_struct *thread; |
4443 | ||
fbd9a2ce SAS |
4444 | lockdep_assert_irqs_disabled(); |
4445 | ||
29863d41 WW |
4446 | if (test_bit(NAPI_STATE_THREADED, &napi->state)) { |
4447 | /* Paired with smp_mb__before_atomic() in | |
5fdd2f0e WW |
4448 | * napi_enable()/dev_set_threaded(). |
4449 | * Use READ_ONCE() to guarantee a complete | |
4450 | * read on napi->thread. Only call | |
29863d41 WW |
4451 | * wake_up_process() when it's not NULL. |
4452 | */ | |
4453 | thread = READ_ONCE(napi->thread); | |
4454 | if (thread) { | |
cb038357 WW |
4455 | /* Avoid doing set_bit() if the thread is in |
4456 | * INTERRUPTIBLE state, cause napi_thread_wait() | |
4457 | * makes sure to proceed with napi polling | |
4458 | * if the thread is explicitly woken from here. | |
4459 | */ | |
2f064a59 | 4460 | if (READ_ONCE(thread->__state) != TASK_INTERRUPTIBLE) |
cb038357 | 4461 | set_bit(NAPI_STATE_SCHED_THREADED, &napi->state); |
29863d41 WW |
4462 | wake_up_process(thread); |
4463 | return; | |
4464 | } | |
4465 | } | |
4466 | ||
eecfd7c4 | 4467 | list_add_tail(&napi->poll_list, &sd->poll_list); |
8c48eea3 | 4468 | WRITE_ONCE(napi->list_owner, smp_processor_id()); |
8b43fd3d ED |
4469 | /* If not called from net_rx_action() |
4470 | * we have to raise NET_RX_SOFTIRQ. | |
4471 | */ | |
4472 | if (!sd->in_net_rx_action) | |
4473 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
eecfd7c4 ED |
4474 | } |
4475 | ||
bfb564e7 KK |
4476 | #ifdef CONFIG_RPS |
4477 | ||
4478 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 4479 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 4480 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
4481 | u32 rps_cpu_mask __read_mostly; |
4482 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 4483 | |
dc05360f | 4484 | struct static_key_false rps_needed __read_mostly; |
3df97ba8 | 4485 | EXPORT_SYMBOL(rps_needed); |
dc05360f | 4486 | struct static_key_false rfs_needed __read_mostly; |
13bfff25 | 4487 | EXPORT_SYMBOL(rfs_needed); |
adc9300e | 4488 | |
c445477d BH |
4489 | static struct rps_dev_flow * |
4490 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
4491 | struct rps_dev_flow *rflow, u16 next_cpu) | |
4492 | { | |
a31196b0 | 4493 | if (next_cpu < nr_cpu_ids) { |
c445477d BH |
4494 | #ifdef CONFIG_RFS_ACCEL |
4495 | struct netdev_rx_queue *rxqueue; | |
4496 | struct rps_dev_flow_table *flow_table; | |
4497 | struct rps_dev_flow *old_rflow; | |
4498 | u32 flow_id; | |
4499 | u16 rxq_index; | |
4500 | int rc; | |
4501 | ||
4502 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
4503 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
4504 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
4505 | goto out; |
4506 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
4507 | if (rxq_index == skb_get_rx_queue(skb)) | |
4508 | goto out; | |
4509 | ||
4510 | rxqueue = dev->_rx + rxq_index; | |
4511 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4512 | if (!flow_table) | |
4513 | goto out; | |
61b905da | 4514 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
4515 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
4516 | rxq_index, flow_id); | |
4517 | if (rc < 0) | |
4518 | goto out; | |
4519 | old_rflow = rflow; | |
4520 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
4521 | rflow->filter = rc; |
4522 | if (old_rflow->filter == rflow->filter) | |
4523 | old_rflow->filter = RPS_NO_FILTER; | |
4524 | out: | |
4525 | #endif | |
4526 | rflow->last_qtail = | |
09994d1b | 4527 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
4528 | } |
4529 | ||
09994d1b | 4530 | rflow->cpu = next_cpu; |
c445477d BH |
4531 | return rflow; |
4532 | } | |
4533 | ||
bfb564e7 KK |
4534 | /* |
4535 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
4536 | * CPU from the RPS map of the receiving queue for a given skb. | |
4537 | * rcu_read_lock must be held on entry. | |
4538 | */ | |
4539 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
4540 | struct rps_dev_flow **rflowp) | |
4541 | { | |
567e4b79 ED |
4542 | const struct rps_sock_flow_table *sock_flow_table; |
4543 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 4544 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 4545 | struct rps_map *map; |
bfb564e7 | 4546 | int cpu = -1; |
567e4b79 | 4547 | u32 tcpu; |
61b905da | 4548 | u32 hash; |
bfb564e7 KK |
4549 | |
4550 | if (skb_rx_queue_recorded(skb)) { | |
4551 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 4552 | |
62fe0b40 BH |
4553 | if (unlikely(index >= dev->real_num_rx_queues)) { |
4554 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4555 | "%s received packet on queue %u, but number " | |
4556 | "of RX queues is %u\n", | |
4557 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
4558 | goto done; |
4559 | } | |
567e4b79 ED |
4560 | rxqueue += index; |
4561 | } | |
bfb564e7 | 4562 | |
567e4b79 ED |
4563 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
4564 | ||
4565 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 4566 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 4567 | if (!flow_table && !map) |
bfb564e7 KK |
4568 | goto done; |
4569 | ||
2d47b459 | 4570 | skb_reset_network_header(skb); |
61b905da TH |
4571 | hash = skb_get_hash(skb); |
4572 | if (!hash) | |
bfb564e7 KK |
4573 | goto done; |
4574 | ||
fec5e652 TH |
4575 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
4576 | if (flow_table && sock_flow_table) { | |
fec5e652 | 4577 | struct rps_dev_flow *rflow; |
567e4b79 ED |
4578 | u32 next_cpu; |
4579 | u32 ident; | |
4580 | ||
5c3b74a9 ED |
4581 | /* First check into global flow table if there is a match. |
4582 | * This READ_ONCE() pairs with WRITE_ONCE() from rps_record_sock_flow(). | |
4583 | */ | |
4584 | ident = READ_ONCE(sock_flow_table->ents[hash & sock_flow_table->mask]); | |
567e4b79 ED |
4585 | if ((ident ^ hash) & ~rps_cpu_mask) |
4586 | goto try_rps; | |
fec5e652 | 4587 | |
567e4b79 ED |
4588 | next_cpu = ident & rps_cpu_mask; |
4589 | ||
4590 | /* OK, now we know there is a match, | |
4591 | * we can look at the local (per receive queue) flow table | |
4592 | */ | |
61b905da | 4593 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
4594 | tcpu = rflow->cpu; |
4595 | ||
fec5e652 TH |
4596 | /* |
4597 | * If the desired CPU (where last recvmsg was done) is | |
4598 | * different from current CPU (one in the rx-queue flow | |
4599 | * table entry), switch if one of the following holds: | |
a31196b0 | 4600 | * - Current CPU is unset (>= nr_cpu_ids). |
fec5e652 TH |
4601 | * - Current CPU is offline. |
4602 | * - The current CPU's queue tail has advanced beyond the | |
4603 | * last packet that was enqueued using this table entry. | |
4604 | * This guarantees that all previous packets for the flow | |
4605 | * have been dequeued, thus preserving in order delivery. | |
4606 | */ | |
4607 | if (unlikely(tcpu != next_cpu) && | |
a31196b0 | 4608 | (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
fec5e652 | 4609 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
baefa31d TH |
4610 | rflow->last_qtail)) >= 0)) { |
4611 | tcpu = next_cpu; | |
c445477d | 4612 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 4613 | } |
c445477d | 4614 | |
a31196b0 | 4615 | if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
fec5e652 TH |
4616 | *rflowp = rflow; |
4617 | cpu = tcpu; | |
4618 | goto done; | |
4619 | } | |
4620 | } | |
4621 | ||
567e4b79 ED |
4622 | try_rps: |
4623 | ||
0a9627f2 | 4624 | if (map) { |
8fc54f68 | 4625 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
4626 | if (cpu_online(tcpu)) { |
4627 | cpu = tcpu; | |
4628 | goto done; | |
4629 | } | |
4630 | } | |
4631 | ||
4632 | done: | |
0a9627f2 TH |
4633 | return cpu; |
4634 | } | |
4635 | ||
c445477d BH |
4636 | #ifdef CONFIG_RFS_ACCEL |
4637 | ||
4638 | /** | |
4639 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
4640 | * @dev: Device on which the filter was set | |
4641 | * @rxq_index: RX queue index | |
4642 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
4643 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
4644 | * | |
4645 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
4646 | * this function for each installed filter and remove the filters for | |
4647 | * which it returns %true. | |
4648 | */ | |
4649 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
4650 | u32 flow_id, u16 filter_id) | |
4651 | { | |
4652 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
4653 | struct rps_dev_flow_table *flow_table; | |
4654 | struct rps_dev_flow *rflow; | |
4655 | bool expire = true; | |
a31196b0 | 4656 | unsigned int cpu; |
c445477d BH |
4657 | |
4658 | rcu_read_lock(); | |
4659 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4660 | if (flow_table && flow_id <= flow_table->mask) { | |
4661 | rflow = &flow_table->flows[flow_id]; | |
6aa7de05 | 4662 | cpu = READ_ONCE(rflow->cpu); |
a31196b0 | 4663 | if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
c445477d BH |
4664 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
4665 | rflow->last_qtail) < | |
4666 | (int)(10 * flow_table->mask))) | |
4667 | expire = false; | |
4668 | } | |
4669 | rcu_read_unlock(); | |
4670 | return expire; | |
4671 | } | |
4672 | EXPORT_SYMBOL(rps_may_expire_flow); | |
4673 | ||
4674 | #endif /* CONFIG_RFS_ACCEL */ | |
4675 | ||
0a9627f2 | 4676 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 4677 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 4678 | { |
e36fa2f7 ED |
4679 | struct softnet_data *sd = data; |
4680 | ||
eecfd7c4 | 4681 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 4682 | sd->received_rps++; |
0a9627f2 | 4683 | } |
e36fa2f7 | 4684 | |
fec5e652 | 4685 | #endif /* CONFIG_RPS */ |
0a9627f2 | 4686 | |
68822bdf | 4687 | /* Called from hardirq (IPI) context */ |
97e719a8 | 4688 | static void trigger_rx_softirq(void *data) |
68822bdf | 4689 | { |
97e719a8 ED |
4690 | struct softnet_data *sd = data; |
4691 | ||
68822bdf | 4692 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
97e719a8 | 4693 | smp_store_release(&sd->defer_ipi_scheduled, 0); |
68822bdf ED |
4694 | } |
4695 | ||
e36fa2f7 | 4696 | /* |
8fcb76b9 ED |
4697 | * After we queued a packet into sd->input_pkt_queue, |
4698 | * we need to make sure this queue is serviced soon. | |
4699 | * | |
4700 | * - If this is another cpu queue, link it to our rps_ipi_list, | |
4701 | * and make sure we will process rps_ipi_list from net_rx_action(). | |
8fcb76b9 ED |
4702 | * |
4703 | * - If this is our own queue, NAPI schedule our backlog. | |
4704 | * Note that this also raises NET_RX_SOFTIRQ. | |
e36fa2f7 | 4705 | */ |
8fcb76b9 | 4706 | static void napi_schedule_rps(struct softnet_data *sd) |
e36fa2f7 | 4707 | { |
903ceff7 | 4708 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 | 4709 | |
e722db8d | 4710 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
4711 | if (sd != mysd) { |
4712 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
4713 | mysd->rps_ipi_list = sd; | |
4714 | ||
87eff2ec | 4715 | /* If not called from net_rx_action() or napi_threaded_poll() |
821eba96 ED |
4716 | * we have to raise NET_RX_SOFTIRQ. |
4717 | */ | |
87eff2ec | 4718 | if (!mysd->in_net_rx_action && !mysd->in_napi_threaded_poll) |
821eba96 | 4719 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
8fcb76b9 | 4720 | return; |
e36fa2f7 ED |
4721 | } |
4722 | #endif /* CONFIG_RPS */ | |
e722db8d | 4723 | __napi_schedule_irqoff(&mysd->backlog); |
e36fa2f7 ED |
4724 | } |
4725 | ||
99bbc707 WB |
4726 | #ifdef CONFIG_NET_FLOW_LIMIT |
4727 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
4728 | #endif | |
4729 | ||
4730 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
4731 | { | |
4732 | #ifdef CONFIG_NET_FLOW_LIMIT | |
4733 | struct sd_flow_limit *fl; | |
4734 | struct softnet_data *sd; | |
4735 | unsigned int old_flow, new_flow; | |
4736 | ||
5dcd08cd | 4737 | if (qlen < (READ_ONCE(netdev_max_backlog) >> 1)) |
99bbc707 WB |
4738 | return false; |
4739 | ||
903ceff7 | 4740 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
4741 | |
4742 | rcu_read_lock(); | |
4743 | fl = rcu_dereference(sd->flow_limit); | |
4744 | if (fl) { | |
3958afa1 | 4745 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
4746 | old_flow = fl->history[fl->history_head]; |
4747 | fl->history[fl->history_head] = new_flow; | |
4748 | ||
4749 | fl->history_head++; | |
4750 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
4751 | ||
4752 | if (likely(fl->buckets[old_flow])) | |
4753 | fl->buckets[old_flow]--; | |
4754 | ||
4755 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
4756 | fl->count++; | |
4757 | rcu_read_unlock(); | |
4758 | return true; | |
4759 | } | |
4760 | } | |
4761 | rcu_read_unlock(); | |
4762 | #endif | |
4763 | return false; | |
4764 | } | |
4765 | ||
0a9627f2 TH |
4766 | /* |
4767 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
4768 | * queue (may be a remote CPU queue). | |
4769 | */ | |
fec5e652 TH |
4770 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
4771 | unsigned int *qtail) | |
0a9627f2 | 4772 | { |
44f0bd40 | 4773 | enum skb_drop_reason reason; |
e36fa2f7 | 4774 | struct softnet_data *sd; |
0a9627f2 | 4775 | unsigned long flags; |
99bbc707 | 4776 | unsigned int qlen; |
0a9627f2 | 4777 | |
44f0bd40 | 4778 | reason = SKB_DROP_REASON_NOT_SPECIFIED; |
e36fa2f7 | 4779 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 | 4780 | |
e722db8d | 4781 | rps_lock_irqsave(sd, &flags); |
e9e4dd32 JA |
4782 | if (!netif_running(skb->dev)) |
4783 | goto drop; | |
99bbc707 | 4784 | qlen = skb_queue_len(&sd->input_pkt_queue); |
5dcd08cd | 4785 | if (qlen <= READ_ONCE(netdev_max_backlog) && !skb_flow_limit(skb, qlen)) { |
e008f3f0 | 4786 | if (qlen) { |
0a9627f2 | 4787 | enqueue: |
e36fa2f7 | 4788 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 4789 | input_queue_tail_incr_save(sd, qtail); |
e722db8d | 4790 | rps_unlock_irq_restore(sd, &flags); |
0a9627f2 TH |
4791 | return NET_RX_SUCCESS; |
4792 | } | |
4793 | ||
ebda37c2 ED |
4794 | /* Schedule NAPI for backlog device |
4795 | * We can use non atomic operation since we own the queue lock | |
4796 | */ | |
e722db8d SAS |
4797 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) |
4798 | napi_schedule_rps(sd); | |
0a9627f2 TH |
4799 | goto enqueue; |
4800 | } | |
44f0bd40 | 4801 | reason = SKB_DROP_REASON_CPU_BACKLOG; |
0a9627f2 | 4802 | |
e9e4dd32 | 4803 | drop: |
dee42870 | 4804 | sd->dropped++; |
e722db8d | 4805 | rps_unlock_irq_restore(sd, &flags); |
0a9627f2 | 4806 | |
625788b5 | 4807 | dev_core_stats_rx_dropped_inc(skb->dev); |
44f0bd40 | 4808 | kfree_skb_reason(skb, reason); |
0a9627f2 TH |
4809 | return NET_RX_DROP; |
4810 | } | |
1da177e4 | 4811 | |
e817f856 JDB |
4812 | static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) |
4813 | { | |
4814 | struct net_device *dev = skb->dev; | |
4815 | struct netdev_rx_queue *rxqueue; | |
4816 | ||
4817 | rxqueue = dev->_rx; | |
4818 | ||
4819 | if (skb_rx_queue_recorded(skb)) { | |
4820 | u16 index = skb_get_rx_queue(skb); | |
4821 | ||
4822 | if (unlikely(index >= dev->real_num_rx_queues)) { | |
4823 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4824 | "%s received packet on queue %u, but number " | |
4825 | "of RX queues is %u\n", | |
4826 | dev->name, index, dev->real_num_rx_queues); | |
4827 | ||
4828 | return rxqueue; /* Return first rxqueue */ | |
4829 | } | |
4830 | rxqueue += index; | |
4831 | } | |
4832 | return rxqueue; | |
4833 | } | |
4834 | ||
fe21cb91 KKD |
4835 | u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, |
4836 | struct bpf_prog *xdp_prog) | |
d4455169 | 4837 | { |
be9df4af | 4838 | void *orig_data, *orig_data_end, *hard_start; |
e817f856 | 4839 | struct netdev_rx_queue *rxqueue; |
22b60343 | 4840 | bool orig_bcast, orig_host; |
43b5169d | 4841 | u32 mac_len, frame_sz; |
29724956 JDB |
4842 | __be16 orig_eth_type; |
4843 | struct ethhdr *eth; | |
fe21cb91 | 4844 | u32 metalen, act; |
be9df4af | 4845 | int off; |
d4455169 | 4846 | |
d4455169 JF |
4847 | /* The XDP program wants to see the packet starting at the MAC |
4848 | * header. | |
4849 | */ | |
4850 | mac_len = skb->data - skb_mac_header(skb); | |
be9df4af | 4851 | hard_start = skb->data - skb_headroom(skb); |
a075767b JDB |
4852 | |
4853 | /* SKB "head" area always have tailroom for skb_shared_info */ | |
be9df4af | 4854 | frame_sz = (void *)skb_end_pointer(skb) - hard_start; |
43b5169d | 4855 | frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
a075767b | 4856 | |
be9df4af LB |
4857 | rxqueue = netif_get_rxqueue(skb); |
4858 | xdp_init_buff(xdp, frame_sz, &rxqueue->xdp_rxq); | |
4859 | xdp_prepare_buff(xdp, hard_start, skb_headroom(skb) - mac_len, | |
4860 | skb_headlen(skb) + mac_len, true); | |
a075767b | 4861 | |
02671e23 BT |
4862 | orig_data_end = xdp->data_end; |
4863 | orig_data = xdp->data; | |
29724956 | 4864 | eth = (struct ethhdr *)xdp->data; |
22b60343 | 4865 | orig_host = ether_addr_equal_64bits(eth->h_dest, skb->dev->dev_addr); |
29724956 JDB |
4866 | orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest); |
4867 | orig_eth_type = eth->h_proto; | |
d4455169 | 4868 | |
02671e23 | 4869 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
d4455169 | 4870 | |
065af355 | 4871 | /* check if bpf_xdp_adjust_head was used */ |
02671e23 | 4872 | off = xdp->data - orig_data; |
065af355 JDB |
4873 | if (off) { |
4874 | if (off > 0) | |
4875 | __skb_pull(skb, off); | |
4876 | else if (off < 0) | |
4877 | __skb_push(skb, -off); | |
4878 | ||
4879 | skb->mac_header += off; | |
4880 | skb_reset_network_header(skb); | |
4881 | } | |
d4455169 | 4882 | |
a075767b JDB |
4883 | /* check if bpf_xdp_adjust_tail was used */ |
4884 | off = xdp->data_end - orig_data_end; | |
f7613120 | 4885 | if (off != 0) { |
02671e23 | 4886 | skb_set_tail_pointer(skb, xdp->data_end - xdp->data); |
a075767b | 4887 | skb->len += off; /* positive on grow, negative on shrink */ |
f7613120 | 4888 | } |
198d83bb | 4889 | |
29724956 JDB |
4890 | /* check if XDP changed eth hdr such SKB needs update */ |
4891 | eth = (struct ethhdr *)xdp->data; | |
4892 | if ((orig_eth_type != eth->h_proto) || | |
22b60343 MW |
4893 | (orig_host != ether_addr_equal_64bits(eth->h_dest, |
4894 | skb->dev->dev_addr)) || | |
29724956 JDB |
4895 | (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) { |
4896 | __skb_push(skb, ETH_HLEN); | |
22b60343 | 4897 | skb->pkt_type = PACKET_HOST; |
29724956 JDB |
4898 | skb->protocol = eth_type_trans(skb, skb->dev); |
4899 | } | |
4900 | ||
fe21cb91 KKD |
4901 | /* Redirect/Tx gives L2 packet, code that will reuse skb must __skb_pull |
4902 | * before calling us again on redirect path. We do not call do_redirect | |
4903 | * as we leave that up to the caller. | |
4904 | * | |
4905 | * Caller is responsible for managing lifetime of skb (i.e. calling | |
4906 | * kfree_skb in response to actions it cannot handle/XDP_DROP). | |
4907 | */ | |
d4455169 | 4908 | switch (act) { |
6103aa96 | 4909 | case XDP_REDIRECT: |
d4455169 JF |
4910 | case XDP_TX: |
4911 | __skb_push(skb, mac_len); | |
de8f3a83 | 4912 | break; |
d4455169 | 4913 | case XDP_PASS: |
02671e23 | 4914 | metalen = xdp->data - xdp->data_meta; |
de8f3a83 DB |
4915 | if (metalen) |
4916 | skb_metadata_set(skb, metalen); | |
d4455169 | 4917 | break; |
fe21cb91 KKD |
4918 | } |
4919 | ||
4920 | return act; | |
4921 | } | |
4922 | ||
4923 | static u32 netif_receive_generic_xdp(struct sk_buff *skb, | |
4924 | struct xdp_buff *xdp, | |
4925 | struct bpf_prog *xdp_prog) | |
4926 | { | |
4927 | u32 act = XDP_DROP; | |
4928 | ||
4929 | /* Reinjected packets coming from act_mirred or similar should | |
4930 | * not get XDP generic processing. | |
4931 | */ | |
4932 | if (skb_is_redirected(skb)) | |
4933 | return XDP_PASS; | |
4934 | ||
4935 | /* XDP packets must be linear and must have sufficient headroom | |
4936 | * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also | |
4937 | * native XDP provides, thus we need to do it here as well. | |
4938 | */ | |
4939 | if (skb_cloned(skb) || skb_is_nonlinear(skb) || | |
4940 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { | |
4941 | int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); | |
4942 | int troom = skb->tail + skb->data_len - skb->end; | |
4943 | ||
4944 | /* In case we have to go down the path and also linearize, | |
4945 | * then lets do the pskb_expand_head() work just once here. | |
4946 | */ | |
4947 | if (pskb_expand_head(skb, | |
4948 | hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, | |
4949 | troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) | |
4950 | goto do_drop; | |
4951 | if (skb_linearize(skb)) | |
4952 | goto do_drop; | |
4953 | } | |
4954 | ||
4955 | act = bpf_prog_run_generic_xdp(skb, xdp, xdp_prog); | |
4956 | switch (act) { | |
4957 | case XDP_REDIRECT: | |
4958 | case XDP_TX: | |
4959 | case XDP_PASS: | |
4960 | break; | |
d4455169 | 4961 | default: |
c8064e5b | 4962 | bpf_warn_invalid_xdp_action(skb->dev, xdp_prog, act); |
df561f66 | 4963 | fallthrough; |
d4455169 JF |
4964 | case XDP_ABORTED: |
4965 | trace_xdp_exception(skb->dev, xdp_prog, act); | |
df561f66 | 4966 | fallthrough; |
d4455169 JF |
4967 | case XDP_DROP: |
4968 | do_drop: | |
4969 | kfree_skb(skb); | |
4970 | break; | |
4971 | } | |
4972 | ||
4973 | return act; | |
4974 | } | |
4975 | ||
4976 | /* When doing generic XDP we have to bypass the qdisc layer and the | |
1fd6e567 JA |
4977 | * network taps in order to match in-driver-XDP behavior. This also means |
4978 | * that XDP packets are able to starve other packets going through a qdisc, | |
4979 | * and DDOS attacks will be more effective. In-driver-XDP use dedicated TX | |
4980 | * queues, so they do not have this starvation issue. | |
d4455169 | 4981 | */ |
7c497478 | 4982 | void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) |
d4455169 JF |
4983 | { |
4984 | struct net_device *dev = skb->dev; | |
4985 | struct netdev_queue *txq; | |
4986 | bool free_skb = true; | |
4987 | int cpu, rc; | |
4988 | ||
4bd97d51 | 4989 | txq = netdev_core_pick_tx(dev, skb, NULL); |
d4455169 JF |
4990 | cpu = smp_processor_id(); |
4991 | HARD_TX_LOCK(dev, txq, cpu); | |
1fd6e567 | 4992 | if (!netif_xmit_frozen_or_drv_stopped(txq)) { |
d4455169 JF |
4993 | rc = netdev_start_xmit(skb, dev, txq, 0); |
4994 | if (dev_xmit_complete(rc)) | |
4995 | free_skb = false; | |
4996 | } | |
4997 | HARD_TX_UNLOCK(dev, txq); | |
4998 | if (free_skb) { | |
4999 | trace_xdp_exception(dev, xdp_prog, XDP_TX); | |
1fd6e567 | 5000 | dev_core_stats_tx_dropped_inc(dev); |
d4455169 JF |
5001 | kfree_skb(skb); |
5002 | } | |
5003 | } | |
5004 | ||
02786475 | 5005 | static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key); |
d4455169 | 5006 | |
7c497478 | 5007 | int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb) |
d4455169 | 5008 | { |
d4455169 | 5009 | if (xdp_prog) { |
02671e23 BT |
5010 | struct xdp_buff xdp; |
5011 | u32 act; | |
6103aa96 | 5012 | int err; |
d4455169 | 5013 | |
02671e23 | 5014 | act = netif_receive_generic_xdp(skb, &xdp, xdp_prog); |
d4455169 | 5015 | if (act != XDP_PASS) { |
6103aa96 JF |
5016 | switch (act) { |
5017 | case XDP_REDIRECT: | |
2facaad6 | 5018 | err = xdp_do_generic_redirect(skb->dev, skb, |
02671e23 | 5019 | &xdp, xdp_prog); |
6103aa96 JF |
5020 | if (err) |
5021 | goto out_redir; | |
02671e23 | 5022 | break; |
6103aa96 | 5023 | case XDP_TX: |
d4455169 | 5024 | generic_xdp_tx(skb, xdp_prog); |
6103aa96 JF |
5025 | break; |
5026 | } | |
d4455169 JF |
5027 | return XDP_DROP; |
5028 | } | |
5029 | } | |
5030 | return XDP_PASS; | |
6103aa96 | 5031 | out_redir: |
7e726ed8 | 5032 | kfree_skb_reason(skb, SKB_DROP_REASON_XDP); |
6103aa96 | 5033 | return XDP_DROP; |
d4455169 | 5034 | } |
7c497478 | 5035 | EXPORT_SYMBOL_GPL(do_xdp_generic); |
d4455169 | 5036 | |
ae78dbfa | 5037 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 5038 | { |
b0e28f1e | 5039 | int ret; |
1da177e4 | 5040 | |
61adf447 | 5041 | net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); |
1da177e4 | 5042 | |
cf66ba58 | 5043 | trace_netif_rx(skb); |
d4455169 | 5044 | |
df334545 | 5045 | #ifdef CONFIG_RPS |
dc05360f | 5046 | if (static_branch_unlikely(&rps_needed)) { |
fec5e652 | 5047 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
5048 | int cpu; |
5049 | ||
5050 | rcu_read_lock(); | |
fec5e652 TH |
5051 | |
5052 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
5053 | if (cpu < 0) |
5054 | cpu = smp_processor_id(); | |
fec5e652 TH |
5055 | |
5056 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
5057 | ||
b0e28f1e | 5058 | rcu_read_unlock(); |
adc9300e ED |
5059 | } else |
5060 | #endif | |
fec5e652 TH |
5061 | { |
5062 | unsigned int qtail; | |
f4563a75 | 5063 | |
f234ae29 | 5064 | ret = enqueue_to_backlog(skb, smp_processor_id(), &qtail); |
fec5e652 | 5065 | } |
b0e28f1e | 5066 | return ret; |
1da177e4 | 5067 | } |
ae78dbfa | 5068 | |
baebdf48 SAS |
5069 | /** |
5070 | * __netif_rx - Slightly optimized version of netif_rx | |
5071 | * @skb: buffer to post | |
5072 | * | |
5073 | * This behaves as netif_rx except that it does not disable bottom halves. | |
5074 | * As a result this function may only be invoked from the interrupt context | |
5075 | * (either hard or soft interrupt). | |
5076 | */ | |
5077 | int __netif_rx(struct sk_buff *skb) | |
5078 | { | |
5079 | int ret; | |
5080 | ||
351bdbb6 | 5081 | lockdep_assert_once(hardirq_count() | softirq_count()); |
baebdf48 SAS |
5082 | |
5083 | trace_netif_rx_entry(skb); | |
5084 | ret = netif_rx_internal(skb); | |
5085 | trace_netif_rx_exit(ret); | |
5086 | return ret; | |
5087 | } | |
5088 | EXPORT_SYMBOL(__netif_rx); | |
5089 | ||
ae78dbfa BH |
5090 | /** |
5091 | * netif_rx - post buffer to the network code | |
5092 | * @skb: buffer to post | |
5093 | * | |
5094 | * This function receives a packet from a device driver and queues it for | |
baebdf48 SAS |
5095 | * the upper (protocol) levels to process via the backlog NAPI device. It |
5096 | * always succeeds. The buffer may be dropped during processing for | |
5097 | * congestion control or by the protocol layers. | |
5098 | * The network buffer is passed via the backlog NAPI device. Modern NIC | |
5099 | * driver should use NAPI and GRO. | |
167053f8 SAS |
5100 | * This function can used from interrupt and from process context. The |
5101 | * caller from process context must not disable interrupts before invoking | |
5102 | * this function. | |
ae78dbfa BH |
5103 | * |
5104 | * return values: | |
5105 | * NET_RX_SUCCESS (no congestion) | |
5106 | * NET_RX_DROP (packet was dropped) | |
5107 | * | |
5108 | */ | |
ae78dbfa BH |
5109 | int netif_rx(struct sk_buff *skb) |
5110 | { | |
167053f8 | 5111 | bool need_bh_off = !(hardirq_count() | softirq_count()); |
b0e3f1bd GB |
5112 | int ret; |
5113 | ||
167053f8 SAS |
5114 | if (need_bh_off) |
5115 | local_bh_disable(); | |
ae78dbfa | 5116 | trace_netif_rx_entry(skb); |
b0e3f1bd GB |
5117 | ret = netif_rx_internal(skb); |
5118 | trace_netif_rx_exit(ret); | |
167053f8 SAS |
5119 | if (need_bh_off) |
5120 | local_bh_enable(); | |
b0e3f1bd | 5121 | return ret; |
ae78dbfa | 5122 | } |
d1b19dff | 5123 | EXPORT_SYMBOL(netif_rx); |
1da177e4 | 5124 | |
0766f788 | 5125 | static __latent_entropy void net_tx_action(struct softirq_action *h) |
1da177e4 | 5126 | { |
903ceff7 | 5127 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
5128 | |
5129 | if (sd->completion_queue) { | |
5130 | struct sk_buff *clist; | |
5131 | ||
5132 | local_irq_disable(); | |
5133 | clist = sd->completion_queue; | |
5134 | sd->completion_queue = NULL; | |
5135 | local_irq_enable(); | |
5136 | ||
5137 | while (clist) { | |
5138 | struct sk_buff *skb = clist; | |
f4563a75 | 5139 | |
1da177e4 LT |
5140 | clist = clist->next; |
5141 | ||
63354797 | 5142 | WARN_ON(refcount_read(&skb->users)); |
40bbae58 | 5143 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_CONSUMED)) |
dd1b5278 | 5144 | trace_consume_skb(skb, net_tx_action); |
e6247027 | 5145 | else |
c504e5c2 | 5146 | trace_kfree_skb(skb, net_tx_action, |
40bbae58 | 5147 | get_kfree_skb_cb(skb)->reason); |
15fad714 JDB |
5148 | |
5149 | if (skb->fclone != SKB_FCLONE_UNAVAILABLE) | |
5150 | __kfree_skb(skb); | |
5151 | else | |
8fa66e4a JK |
5152 | __napi_kfree_skb(skb, |
5153 | get_kfree_skb_cb(skb)->reason); | |
1da177e4 LT |
5154 | } |
5155 | } | |
5156 | ||
5157 | if (sd->output_queue) { | |
37437bb2 | 5158 | struct Qdisc *head; |
1da177e4 LT |
5159 | |
5160 | local_irq_disable(); | |
5161 | head = sd->output_queue; | |
5162 | sd->output_queue = NULL; | |
a9cbd588 | 5163 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
5164 | local_irq_enable(); |
5165 | ||
102b55ee YL |
5166 | rcu_read_lock(); |
5167 | ||
1da177e4 | 5168 | while (head) { |
37437bb2 | 5169 | struct Qdisc *q = head; |
6b3ba914 | 5170 | spinlock_t *root_lock = NULL; |
37437bb2 | 5171 | |
1da177e4 LT |
5172 | head = head->next_sched; |
5173 | ||
3bcb846c ED |
5174 | /* We need to make sure head->next_sched is read |
5175 | * before clearing __QDISC_STATE_SCHED | |
5176 | */ | |
5177 | smp_mb__before_atomic(); | |
102b55ee YL |
5178 | |
5179 | if (!(q->flags & TCQ_F_NOLOCK)) { | |
5180 | root_lock = qdisc_lock(q); | |
5181 | spin_lock(root_lock); | |
5182 | } else if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, | |
5183 | &q->state))) { | |
5184 | /* There is a synchronize_net() between | |
5185 | * STATE_DEACTIVATED flag being set and | |
5186 | * qdisc_reset()/some_qdisc_is_busy() in | |
5187 | * dev_deactivate(), so we can safely bail out | |
5188 | * early here to avoid data race between | |
5189 | * qdisc_deactivate() and some_qdisc_is_busy() | |
5190 | * for lockless qdisc. | |
5191 | */ | |
5192 | clear_bit(__QDISC_STATE_SCHED, &q->state); | |
5193 | continue; | |
5194 | } | |
5195 | ||
3bcb846c ED |
5196 | clear_bit(__QDISC_STATE_SCHED, &q->state); |
5197 | qdisc_run(q); | |
6b3ba914 JF |
5198 | if (root_lock) |
5199 | spin_unlock(root_lock); | |
1da177e4 | 5200 | } |
102b55ee YL |
5201 | |
5202 | rcu_read_unlock(); | |
1da177e4 | 5203 | } |
f53c7239 SK |
5204 | |
5205 | xfrm_dev_backlog(sd); | |
1da177e4 LT |
5206 | } |
5207 | ||
181402a5 | 5208 | #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
5209 | /* This hook is defined here for ATM LANE */ |
5210 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
5211 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 5212 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 5213 | #endif |
1da177e4 | 5214 | |
24b27fc4 MB |
5215 | /** |
5216 | * netdev_is_rx_handler_busy - check if receive handler is registered | |
5217 | * @dev: device to check | |
5218 | * | |
5219 | * Check if a receive handler is already registered for a given device. | |
5220 | * Return true if there one. | |
5221 | * | |
5222 | * The caller must hold the rtnl_mutex. | |
5223 | */ | |
5224 | bool netdev_is_rx_handler_busy(struct net_device *dev) | |
5225 | { | |
5226 | ASSERT_RTNL(); | |
5227 | return dev && rtnl_dereference(dev->rx_handler); | |
5228 | } | |
5229 | EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); | |
5230 | ||
ab95bfe0 JP |
5231 | /** |
5232 | * netdev_rx_handler_register - register receive handler | |
5233 | * @dev: device to register a handler for | |
5234 | * @rx_handler: receive handler to register | |
93e2c32b | 5235 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 5236 | * |
e227867f | 5237 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
5238 | * called from __netif_receive_skb. A negative errno code is returned |
5239 | * on a failure. | |
5240 | * | |
5241 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
5242 | * |
5243 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
5244 | */ |
5245 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
5246 | rx_handler_func_t *rx_handler, |
5247 | void *rx_handler_data) | |
ab95bfe0 | 5248 | { |
1b7cd004 | 5249 | if (netdev_is_rx_handler_busy(dev)) |
ab95bfe0 JP |
5250 | return -EBUSY; |
5251 | ||
f5426250 PA |
5252 | if (dev->priv_flags & IFF_NO_RX_HANDLER) |
5253 | return -EINVAL; | |
5254 | ||
00cfec37 | 5255 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 5256 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
5257 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
5258 | ||
5259 | return 0; | |
5260 | } | |
5261 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
5262 | ||
5263 | /** | |
5264 | * netdev_rx_handler_unregister - unregister receive handler | |
5265 | * @dev: device to unregister a handler from | |
5266 | * | |
166ec369 | 5267 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
5268 | * |
5269 | * The caller must hold the rtnl_mutex. | |
5270 | */ | |
5271 | void netdev_rx_handler_unregister(struct net_device *dev) | |
5272 | { | |
5273 | ||
5274 | ASSERT_RTNL(); | |
a9b3cd7f | 5275 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
5276 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
5277 | * section has a guarantee to see a non NULL rx_handler_data | |
5278 | * as well. | |
5279 | */ | |
5280 | synchronize_net(); | |
a9b3cd7f | 5281 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
5282 | } |
5283 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
5284 | ||
b4b9e355 MG |
5285 | /* |
5286 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
5287 | * the special handling of PFMEMALLOC skbs. | |
5288 | */ | |
5289 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
5290 | { | |
5291 | switch (skb->protocol) { | |
2b8837ae JP |
5292 | case htons(ETH_P_ARP): |
5293 | case htons(ETH_P_IP): | |
5294 | case htons(ETH_P_IPV6): | |
5295 | case htons(ETH_P_8021Q): | |
5296 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
5297 | return true; |
5298 | default: | |
5299 | return false; | |
5300 | } | |
5301 | } | |
5302 | ||
e687ad60 PN |
5303 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
5304 | int *ret, struct net_device *orig_dev) | |
5305 | { | |
5306 | if (nf_hook_ingress_active(skb)) { | |
2c1e2703 AC |
5307 | int ingress_retval; |
5308 | ||
e687ad60 PN |
5309 | if (*pt_prev) { |
5310 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
5311 | *pt_prev = NULL; | |
5312 | } | |
5313 | ||
2c1e2703 AC |
5314 | rcu_read_lock(); |
5315 | ingress_retval = nf_hook_ingress(skb); | |
5316 | rcu_read_unlock(); | |
5317 | return ingress_retval; | |
e687ad60 PN |
5318 | } |
5319 | return 0; | |
5320 | } | |
e687ad60 | 5321 | |
c0bbbdc3 | 5322 | static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, |
88eb1944 | 5323 | struct packet_type **ppt_prev) |
1da177e4 LT |
5324 | { |
5325 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 5326 | rx_handler_func_t *rx_handler; |
c0bbbdc3 | 5327 | struct sk_buff *skb = *pskb; |
f2ccd8fa | 5328 | struct net_device *orig_dev; |
8a4eb573 | 5329 | bool deliver_exact = false; |
1da177e4 | 5330 | int ret = NET_RX_DROP; |
252e3346 | 5331 | __be16 type; |
1da177e4 | 5332 | |
61adf447 | 5333 | net_timestamp_check(!READ_ONCE(netdev_tstamp_prequeue), skb); |
81bbb3d4 | 5334 | |
cf66ba58 | 5335 | trace_netif_receive_skb(skb); |
9b22ea56 | 5336 | |
cc9bd5ce | 5337 | orig_dev = skb->dev; |
8f903c70 | 5338 | |
c1d2bbe1 | 5339 | skb_reset_network_header(skb); |
fda55eca ED |
5340 | if (!skb_transport_header_was_set(skb)) |
5341 | skb_reset_transport_header(skb); | |
0b5c9db1 | 5342 | skb_reset_mac_len(skb); |
1da177e4 LT |
5343 | |
5344 | pt_prev = NULL; | |
5345 | ||
63d8ea7f | 5346 | another_round: |
b6858177 | 5347 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
5348 | |
5349 | __this_cpu_inc(softnet_data.processed); | |
5350 | ||
458bf2f2 SH |
5351 | if (static_branch_unlikely(&generic_xdp_needed_key)) { |
5352 | int ret2; | |
5353 | ||
2b4cd14f | 5354 | migrate_disable(); |
458bf2f2 | 5355 | ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); |
2b4cd14f | 5356 | migrate_enable(); |
458bf2f2 | 5357 | |
c0bbbdc3 BS |
5358 | if (ret2 != XDP_PASS) { |
5359 | ret = NET_RX_DROP; | |
5360 | goto out; | |
5361 | } | |
458bf2f2 SH |
5362 | } |
5363 | ||
324cefaf | 5364 | if (eth_type_vlan(skb->protocol)) { |
0d5501c1 | 5365 | skb = skb_vlan_untag(skb); |
bcc6d479 | 5366 | if (unlikely(!skb)) |
2c17d27c | 5367 | goto out; |
bcc6d479 JP |
5368 | } |
5369 | ||
cd14e9b7 | 5370 | if (skb_skip_tc_classify(skb)) |
e7246e12 | 5371 | goto skip_classify; |
1da177e4 | 5372 | |
9754e293 | 5373 | if (pfmemalloc) |
b4b9e355 MG |
5374 | goto skip_taps; |
5375 | ||
1da177e4 | 5376 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
5377 | if (pt_prev) |
5378 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5379 | pt_prev = ptype; | |
5380 | } | |
5381 | ||
5382 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
5383 | if (pt_prev) | |
5384 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5385 | pt_prev = ptype; | |
1da177e4 LT |
5386 | } |
5387 | ||
b4b9e355 | 5388 | skip_taps: |
1cf51900 | 5389 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 5390 | if (static_branch_unlikely(&ingress_needed_key)) { |
9aa1206e DB |
5391 | bool another = false; |
5392 | ||
42df6e1d | 5393 | nf_skip_egress(skb, true); |
9aa1206e DB |
5394 | skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev, |
5395 | &another); | |
5396 | if (another) | |
5397 | goto another_round; | |
4577139b | 5398 | if (!skb) |
2c17d27c | 5399 | goto out; |
e687ad60 | 5400 | |
42df6e1d | 5401 | nf_skip_egress(skb, false); |
e687ad60 | 5402 | if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) |
2c17d27c | 5403 | goto out; |
cd14e9b7 | 5404 | } |
1cf51900 | 5405 | #endif |
2c64605b | 5406 | skb_reset_redirect(skb); |
e7246e12 | 5407 | skip_classify: |
9754e293 | 5408 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
5409 | goto drop; |
5410 | ||
df8a39de | 5411 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
5412 | if (pt_prev) { |
5413 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5414 | pt_prev = NULL; | |
5415 | } | |
48cc32d3 | 5416 | if (vlan_do_receive(&skb)) |
2425717b JF |
5417 | goto another_round; |
5418 | else if (unlikely(!skb)) | |
2c17d27c | 5419 | goto out; |
2425717b JF |
5420 | } |
5421 | ||
48cc32d3 | 5422 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
5423 | if (rx_handler) { |
5424 | if (pt_prev) { | |
5425 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5426 | pt_prev = NULL; | |
5427 | } | |
8a4eb573 JP |
5428 | switch (rx_handler(&skb)) { |
5429 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 5430 | ret = NET_RX_SUCCESS; |
2c17d27c | 5431 | goto out; |
8a4eb573 | 5432 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 5433 | goto another_round; |
8a4eb573 JP |
5434 | case RX_HANDLER_EXACT: |
5435 | deliver_exact = true; | |
b1866bff | 5436 | break; |
8a4eb573 JP |
5437 | case RX_HANDLER_PASS: |
5438 | break; | |
5439 | default: | |
5440 | BUG(); | |
5441 | } | |
ab95bfe0 | 5442 | } |
1da177e4 | 5443 | |
b14a9fc4 | 5444 | if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) { |
36b2f61a GV |
5445 | check_vlan_id: |
5446 | if (skb_vlan_tag_get_id(skb)) { | |
5447 | /* Vlan id is non 0 and vlan_do_receive() above couldn't | |
5448 | * find vlan device. | |
5449 | */ | |
d4b812de | 5450 | skb->pkt_type = PACKET_OTHERHOST; |
324cefaf | 5451 | } else if (eth_type_vlan(skb->protocol)) { |
36b2f61a GV |
5452 | /* Outer header is 802.1P with vlan 0, inner header is |
5453 | * 802.1Q or 802.1AD and vlan_do_receive() above could | |
5454 | * not find vlan dev for vlan id 0. | |
5455 | */ | |
5456 | __vlan_hwaccel_clear_tag(skb); | |
5457 | skb = skb_vlan_untag(skb); | |
5458 | if (unlikely(!skb)) | |
5459 | goto out; | |
5460 | if (vlan_do_receive(&skb)) | |
5461 | /* After stripping off 802.1P header with vlan 0 | |
5462 | * vlan dev is found for inner header. | |
5463 | */ | |
5464 | goto another_round; | |
5465 | else if (unlikely(!skb)) | |
5466 | goto out; | |
5467 | else | |
5468 | /* We have stripped outer 802.1P vlan 0 header. | |
5469 | * But could not find vlan dev. | |
5470 | * check again for vlan id to set OTHERHOST. | |
5471 | */ | |
5472 | goto check_vlan_id; | |
5473 | } | |
d4b812de ED |
5474 | /* Note: we might in the future use prio bits |
5475 | * and set skb->priority like in vlan_do_receive() | |
5476 | * For the time being, just ignore Priority Code Point | |
5477 | */ | |
b1817524 | 5478 | __vlan_hwaccel_clear_tag(skb); |
d4b812de | 5479 | } |
48cc32d3 | 5480 | |
7866a621 SN |
5481 | type = skb->protocol; |
5482 | ||
63d8ea7f | 5483 | /* deliver only exact match when indicated */ |
7866a621 SN |
5484 | if (likely(!deliver_exact)) { |
5485 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
5486 | &ptype_base[ntohs(type) & | |
5487 | PTYPE_HASH_MASK]); | |
5488 | } | |
1f3c8804 | 5489 | |
7866a621 SN |
5490 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
5491 | &orig_dev->ptype_specific); | |
5492 | ||
5493 | if (unlikely(skb->dev != orig_dev)) { | |
5494 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
5495 | &skb->dev->ptype_specific); | |
1da177e4 LT |
5496 | } |
5497 | ||
5498 | if (pt_prev) { | |
1f8b977a | 5499 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
0e698bf6 | 5500 | goto drop; |
88eb1944 | 5501 | *ppt_prev = pt_prev; |
1da177e4 | 5502 | } else { |
b4b9e355 | 5503 | drop: |
9f8ed577 | 5504 | if (!deliver_exact) |
625788b5 | 5505 | dev_core_stats_rx_dropped_inc(skb->dev); |
9f8ed577 | 5506 | else |
625788b5 | 5507 | dev_core_stats_rx_nohandler_inc(skb->dev); |
9f8ed577 | 5508 | kfree_skb_reason(skb, SKB_DROP_REASON_UNHANDLED_PROTO); |
1da177e4 LT |
5509 | /* Jamal, now you will not able to escape explaining |
5510 | * me how you were going to use this. :-) | |
5511 | */ | |
5512 | ret = NET_RX_DROP; | |
5513 | } | |
5514 | ||
2c17d27c | 5515 | out: |
c0bbbdc3 BS |
5516 | /* The invariant here is that if *ppt_prev is not NULL |
5517 | * then skb should also be non-NULL. | |
5518 | * | |
5519 | * Apparently *ppt_prev assignment above holds this invariant due to | |
5520 | * skb dereferencing near it. | |
5521 | */ | |
5522 | *pskb = skb; | |
9754e293 DM |
5523 | return ret; |
5524 | } | |
5525 | ||
88eb1944 EC |
5526 | static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc) |
5527 | { | |
5528 | struct net_device *orig_dev = skb->dev; | |
5529 | struct packet_type *pt_prev = NULL; | |
5530 | int ret; | |
5531 | ||
c0bbbdc3 | 5532 | ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
88eb1944 | 5533 | if (pt_prev) |
f5737cba PA |
5534 | ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb, |
5535 | skb->dev, pt_prev, orig_dev); | |
88eb1944 EC |
5536 | return ret; |
5537 | } | |
5538 | ||
1c601d82 JDB |
5539 | /** |
5540 | * netif_receive_skb_core - special purpose version of netif_receive_skb | |
5541 | * @skb: buffer to process | |
5542 | * | |
5543 | * More direct receive version of netif_receive_skb(). It should | |
5544 | * only be used by callers that have a need to skip RPS and Generic XDP. | |
2de9780f | 5545 | * Caller must also take care of handling if ``(page_is_)pfmemalloc``. |
1c601d82 JDB |
5546 | * |
5547 | * This function may only be called from softirq context and interrupts | |
5548 | * should be enabled. | |
5549 | * | |
5550 | * Return values (usually ignored): | |
5551 | * NET_RX_SUCCESS: no congestion | |
5552 | * NET_RX_DROP: packet was dropped | |
5553 | */ | |
5554 | int netif_receive_skb_core(struct sk_buff *skb) | |
5555 | { | |
5556 | int ret; | |
5557 | ||
5558 | rcu_read_lock(); | |
88eb1944 | 5559 | ret = __netif_receive_skb_one_core(skb, false); |
1c601d82 JDB |
5560 | rcu_read_unlock(); |
5561 | ||
5562 | return ret; | |
5563 | } | |
5564 | EXPORT_SYMBOL(netif_receive_skb_core); | |
5565 | ||
88eb1944 EC |
5566 | static inline void __netif_receive_skb_list_ptype(struct list_head *head, |
5567 | struct packet_type *pt_prev, | |
5568 | struct net_device *orig_dev) | |
4ce0017a EC |
5569 | { |
5570 | struct sk_buff *skb, *next; | |
5571 | ||
88eb1944 EC |
5572 | if (!pt_prev) |
5573 | return; | |
5574 | if (list_empty(head)) | |
5575 | return; | |
17266ee9 | 5576 | if (pt_prev->list_func != NULL) |
fdf71426 PA |
5577 | INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv, |
5578 | ip_list_rcv, head, pt_prev, orig_dev); | |
17266ee9 | 5579 | else |
9a5a90d1 AL |
5580 | list_for_each_entry_safe(skb, next, head, list) { |
5581 | skb_list_del_init(skb); | |
fdf71426 | 5582 | pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
9a5a90d1 | 5583 | } |
88eb1944 EC |
5584 | } |
5585 | ||
5586 | static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc) | |
5587 | { | |
5588 | /* Fast-path assumptions: | |
5589 | * - There is no RX handler. | |
5590 | * - Only one packet_type matches. | |
5591 | * If either of these fails, we will end up doing some per-packet | |
5592 | * processing in-line, then handling the 'last ptype' for the whole | |
5593 | * sublist. This can't cause out-of-order delivery to any single ptype, | |
5594 | * because the 'last ptype' must be constant across the sublist, and all | |
5595 | * other ptypes are handled per-packet. | |
5596 | */ | |
5597 | /* Current (common) ptype of sublist */ | |
5598 | struct packet_type *pt_curr = NULL; | |
5599 | /* Current (common) orig_dev of sublist */ | |
5600 | struct net_device *od_curr = NULL; | |
5601 | struct list_head sublist; | |
5602 | struct sk_buff *skb, *next; | |
5603 | ||
9af86f93 | 5604 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5605 | list_for_each_entry_safe(skb, next, head, list) { |
5606 | struct net_device *orig_dev = skb->dev; | |
5607 | struct packet_type *pt_prev = NULL; | |
5608 | ||
22f6bbb7 | 5609 | skb_list_del_init(skb); |
c0bbbdc3 | 5610 | __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
9af86f93 EC |
5611 | if (!pt_prev) |
5612 | continue; | |
88eb1944 EC |
5613 | if (pt_curr != pt_prev || od_curr != orig_dev) { |
5614 | /* dispatch old sublist */ | |
88eb1944 EC |
5615 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
5616 | /* start new sublist */ | |
9af86f93 | 5617 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5618 | pt_curr = pt_prev; |
5619 | od_curr = orig_dev; | |
5620 | } | |
9af86f93 | 5621 | list_add_tail(&skb->list, &sublist); |
88eb1944 EC |
5622 | } |
5623 | ||
5624 | /* dispatch final sublist */ | |
9af86f93 | 5625 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
4ce0017a EC |
5626 | } |
5627 | ||
9754e293 DM |
5628 | static int __netif_receive_skb(struct sk_buff *skb) |
5629 | { | |
5630 | int ret; | |
5631 | ||
5632 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
f1083048 | 5633 | unsigned int noreclaim_flag; |
9754e293 DM |
5634 | |
5635 | /* | |
5636 | * PFMEMALLOC skbs are special, they should | |
5637 | * - be delivered to SOCK_MEMALLOC sockets only | |
5638 | * - stay away from userspace | |
5639 | * - have bounded memory usage | |
5640 | * | |
5641 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
5642 | * context down to all allocation sites. | |
5643 | */ | |
f1083048 | 5644 | noreclaim_flag = memalloc_noreclaim_save(); |
88eb1944 | 5645 | ret = __netif_receive_skb_one_core(skb, true); |
f1083048 | 5646 | memalloc_noreclaim_restore(noreclaim_flag); |
9754e293 | 5647 | } else |
88eb1944 | 5648 | ret = __netif_receive_skb_one_core(skb, false); |
9754e293 | 5649 | |
1da177e4 LT |
5650 | return ret; |
5651 | } | |
0a9627f2 | 5652 | |
4ce0017a EC |
5653 | static void __netif_receive_skb_list(struct list_head *head) |
5654 | { | |
5655 | unsigned long noreclaim_flag = 0; | |
5656 | struct sk_buff *skb, *next; | |
5657 | bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */ | |
5658 | ||
5659 | list_for_each_entry_safe(skb, next, head, list) { | |
5660 | if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { | |
5661 | struct list_head sublist; | |
5662 | ||
5663 | /* Handle the previous sublist */ | |
5664 | list_cut_before(&sublist, head, &skb->list); | |
b9f463d6 EC |
5665 | if (!list_empty(&sublist)) |
5666 | __netif_receive_skb_list_core(&sublist, pfmemalloc); | |
4ce0017a EC |
5667 | pfmemalloc = !pfmemalloc; |
5668 | /* See comments in __netif_receive_skb */ | |
5669 | if (pfmemalloc) | |
5670 | noreclaim_flag = memalloc_noreclaim_save(); | |
5671 | else | |
5672 | memalloc_noreclaim_restore(noreclaim_flag); | |
5673 | } | |
5674 | } | |
5675 | /* Handle the remaining sublist */ | |
b9f463d6 EC |
5676 | if (!list_empty(head)) |
5677 | __netif_receive_skb_list_core(head, pfmemalloc); | |
4ce0017a EC |
5678 | /* Restore pflags */ |
5679 | if (pfmemalloc) | |
5680 | memalloc_noreclaim_restore(noreclaim_flag); | |
5681 | } | |
5682 | ||
f4e63525 | 5683 | static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) |
b5cdae32 | 5684 | { |
58038695 | 5685 | struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); |
b5cdae32 DM |
5686 | struct bpf_prog *new = xdp->prog; |
5687 | int ret = 0; | |
5688 | ||
5689 | switch (xdp->command) { | |
58038695 | 5690 | case XDP_SETUP_PROG: |
b5cdae32 DM |
5691 | rcu_assign_pointer(dev->xdp_prog, new); |
5692 | if (old) | |
5693 | bpf_prog_put(old); | |
5694 | ||
5695 | if (old && !new) { | |
02786475 | 5696 | static_branch_dec(&generic_xdp_needed_key); |
b5cdae32 | 5697 | } else if (new && !old) { |
02786475 | 5698 | static_branch_inc(&generic_xdp_needed_key); |
b5cdae32 | 5699 | dev_disable_lro(dev); |
56f5aa77 | 5700 | dev_disable_gro_hw(dev); |
b5cdae32 DM |
5701 | } |
5702 | break; | |
b5cdae32 | 5703 | |
b5cdae32 DM |
5704 | default: |
5705 | ret = -EINVAL; | |
5706 | break; | |
5707 | } | |
5708 | ||
5709 | return ret; | |
5710 | } | |
5711 | ||
ae78dbfa | 5712 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 5713 | { |
2c17d27c JA |
5714 | int ret; |
5715 | ||
61adf447 | 5716 | net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); |
3b098e2d | 5717 | |
c1f19b51 RC |
5718 | if (skb_defer_rx_timestamp(skb)) |
5719 | return NET_RX_SUCCESS; | |
5720 | ||
bbbe211c | 5721 | rcu_read_lock(); |
df334545 | 5722 | #ifdef CONFIG_RPS |
dc05360f | 5723 | if (static_branch_unlikely(&rps_needed)) { |
3b098e2d | 5724 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2c17d27c | 5725 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
0a9627f2 | 5726 | |
3b098e2d ED |
5727 | if (cpu >= 0) { |
5728 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
5729 | rcu_read_unlock(); | |
adc9300e | 5730 | return ret; |
3b098e2d | 5731 | } |
fec5e652 | 5732 | } |
1e94d72f | 5733 | #endif |
2c17d27c JA |
5734 | ret = __netif_receive_skb(skb); |
5735 | rcu_read_unlock(); | |
5736 | return ret; | |
0a9627f2 | 5737 | } |
ae78dbfa | 5738 | |
587652bb | 5739 | void netif_receive_skb_list_internal(struct list_head *head) |
7da517a3 | 5740 | { |
7da517a3 | 5741 | struct sk_buff *skb, *next; |
8c057efa | 5742 | struct list_head sublist; |
7da517a3 | 5743 | |
8c057efa | 5744 | INIT_LIST_HEAD(&sublist); |
7da517a3 | 5745 | list_for_each_entry_safe(skb, next, head, list) { |
61adf447 | 5746 | net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); |
22f6bbb7 | 5747 | skb_list_del_init(skb); |
8c057efa EC |
5748 | if (!skb_defer_rx_timestamp(skb)) |
5749 | list_add_tail(&skb->list, &sublist); | |
7da517a3 | 5750 | } |
8c057efa | 5751 | list_splice_init(&sublist, head); |
7da517a3 | 5752 | |
7da517a3 EC |
5753 | rcu_read_lock(); |
5754 | #ifdef CONFIG_RPS | |
dc05360f | 5755 | if (static_branch_unlikely(&rps_needed)) { |
7da517a3 EC |
5756 | list_for_each_entry_safe(skb, next, head, list) { |
5757 | struct rps_dev_flow voidflow, *rflow = &voidflow; | |
5758 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
5759 | ||
5760 | if (cpu >= 0) { | |
8c057efa | 5761 | /* Will be handled, remove from list */ |
22f6bbb7 | 5762 | skb_list_del_init(skb); |
8c057efa | 5763 | enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
7da517a3 EC |
5764 | } |
5765 | } | |
5766 | } | |
5767 | #endif | |
5768 | __netif_receive_skb_list(head); | |
5769 | rcu_read_unlock(); | |
5770 | } | |
5771 | ||
ae78dbfa BH |
5772 | /** |
5773 | * netif_receive_skb - process receive buffer from network | |
5774 | * @skb: buffer to process | |
5775 | * | |
5776 | * netif_receive_skb() is the main receive data processing function. | |
5777 | * It always succeeds. The buffer may be dropped during processing | |
5778 | * for congestion control or by the protocol layers. | |
5779 | * | |
5780 | * This function may only be called from softirq context and interrupts | |
5781 | * should be enabled. | |
5782 | * | |
5783 | * Return values (usually ignored): | |
5784 | * NET_RX_SUCCESS: no congestion | |
5785 | * NET_RX_DROP: packet was dropped | |
5786 | */ | |
04eb4489 | 5787 | int netif_receive_skb(struct sk_buff *skb) |
ae78dbfa | 5788 | { |
b0e3f1bd GB |
5789 | int ret; |
5790 | ||
ae78dbfa BH |
5791 | trace_netif_receive_skb_entry(skb); |
5792 | ||
b0e3f1bd GB |
5793 | ret = netif_receive_skb_internal(skb); |
5794 | trace_netif_receive_skb_exit(ret); | |
5795 | ||
5796 | return ret; | |
ae78dbfa | 5797 | } |
04eb4489 | 5798 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 5799 | |
f6ad8c1b EC |
5800 | /** |
5801 | * netif_receive_skb_list - process many receive buffers from network | |
5802 | * @head: list of skbs to process. | |
5803 | * | |
7da517a3 EC |
5804 | * Since return value of netif_receive_skb() is normally ignored, and |
5805 | * wouldn't be meaningful for a list, this function returns void. | |
f6ad8c1b EC |
5806 | * |
5807 | * This function may only be called from softirq context and interrupts | |
5808 | * should be enabled. | |
5809 | */ | |
5810 | void netif_receive_skb_list(struct list_head *head) | |
5811 | { | |
7da517a3 | 5812 | struct sk_buff *skb; |
f6ad8c1b | 5813 | |
b9f463d6 EC |
5814 | if (list_empty(head)) |
5815 | return; | |
b0e3f1bd GB |
5816 | if (trace_netif_receive_skb_list_entry_enabled()) { |
5817 | list_for_each_entry(skb, head, list) | |
5818 | trace_netif_receive_skb_list_entry(skb); | |
5819 | } | |
7da517a3 | 5820 | netif_receive_skb_list_internal(head); |
b0e3f1bd | 5821 | trace_netif_receive_skb_list_exit(0); |
f6ad8c1b EC |
5822 | } |
5823 | EXPORT_SYMBOL(netif_receive_skb_list); | |
5824 | ||
ce1e2a77 | 5825 | static DEFINE_PER_CPU(struct work_struct, flush_works); |
145dd5f9 PA |
5826 | |
5827 | /* Network device is going away, flush any packets still pending */ | |
5828 | static void flush_backlog(struct work_struct *work) | |
6e583ce5 | 5829 | { |
6e583ce5 | 5830 | struct sk_buff *skb, *tmp; |
145dd5f9 PA |
5831 | struct softnet_data *sd; |
5832 | ||
5833 | local_bh_disable(); | |
5834 | sd = this_cpu_ptr(&softnet_data); | |
6e583ce5 | 5835 | |
e722db8d | 5836 | rps_lock_irq_disable(sd); |
6e7676c1 | 5837 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
41852497 | 5838 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
e36fa2f7 | 5839 | __skb_unlink(skb, &sd->input_pkt_queue); |
7df5cb75 | 5840 | dev_kfree_skb_irq(skb); |
76cc8b13 | 5841 | input_queue_head_incr(sd); |
6e583ce5 | 5842 | } |
6e7676c1 | 5843 | } |
e722db8d | 5844 | rps_unlock_irq_enable(sd); |
6e7676c1 CG |
5845 | |
5846 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
41852497 | 5847 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
6e7676c1 CG |
5848 | __skb_unlink(skb, &sd->process_queue); |
5849 | kfree_skb(skb); | |
76cc8b13 | 5850 | input_queue_head_incr(sd); |
6e7676c1 CG |
5851 | } |
5852 | } | |
145dd5f9 PA |
5853 | local_bh_enable(); |
5854 | } | |
5855 | ||
2de79ee2 PA |
5856 | static bool flush_required(int cpu) |
5857 | { | |
5858 | #if IS_ENABLED(CONFIG_RPS) | |
5859 | struct softnet_data *sd = &per_cpu(softnet_data, cpu); | |
5860 | bool do_flush; | |
5861 | ||
e722db8d | 5862 | rps_lock_irq_disable(sd); |
2de79ee2 PA |
5863 | |
5864 | /* as insertion into process_queue happens with the rps lock held, | |
5865 | * process_queue access may race only with dequeue | |
5866 | */ | |
5867 | do_flush = !skb_queue_empty(&sd->input_pkt_queue) || | |
5868 | !skb_queue_empty_lockless(&sd->process_queue); | |
e722db8d | 5869 | rps_unlock_irq_enable(sd); |
2de79ee2 PA |
5870 | |
5871 | return do_flush; | |
5872 | #endif | |
5873 | /* without RPS we can't safely check input_pkt_queue: during a | |
5874 | * concurrent remote skb_queue_splice() we can detect as empty both | |
5875 | * input_pkt_queue and process_queue even if the latter could end-up | |
5876 | * containing a lot of packets. | |
5877 | */ | |
5878 | return true; | |
5879 | } | |
5880 | ||
41852497 | 5881 | static void flush_all_backlogs(void) |
145dd5f9 | 5882 | { |
2de79ee2 | 5883 | static cpumask_t flush_cpus; |
145dd5f9 PA |
5884 | unsigned int cpu; |
5885 | ||
2de79ee2 PA |
5886 | /* since we are under rtnl lock protection we can use static data |
5887 | * for the cpumask and avoid allocating on stack the possibly | |
5888 | * large mask | |
5889 | */ | |
5890 | ASSERT_RTNL(); | |
5891 | ||
372bbdd5 | 5892 | cpus_read_lock(); |
145dd5f9 | 5893 | |
2de79ee2 PA |
5894 | cpumask_clear(&flush_cpus); |
5895 | for_each_online_cpu(cpu) { | |
5896 | if (flush_required(cpu)) { | |
5897 | queue_work_on(cpu, system_highpri_wq, | |
5898 | per_cpu_ptr(&flush_works, cpu)); | |
5899 | cpumask_set_cpu(cpu, &flush_cpus); | |
5900 | } | |
5901 | } | |
145dd5f9 | 5902 | |
2de79ee2 | 5903 | /* we can have in flight packet[s] on the cpus we are not flushing, |
0cbe1e57 | 5904 | * synchronize_net() in unregister_netdevice_many() will take care of |
2de79ee2 PA |
5905 | * them |
5906 | */ | |
5907 | for_each_cpu(cpu, &flush_cpus) | |
41852497 | 5908 | flush_work(per_cpu_ptr(&flush_works, cpu)); |
145dd5f9 | 5909 | |
372bbdd5 | 5910 | cpus_read_unlock(); |
6e583ce5 SH |
5911 | } |
5912 | ||
773fc8f6 | 5913 | static void net_rps_send_ipi(struct softnet_data *remsd) |
5914 | { | |
5915 | #ifdef CONFIG_RPS | |
5916 | while (remsd) { | |
5917 | struct softnet_data *next = remsd->rps_ipi_next; | |
5918 | ||
5919 | if (cpu_online(remsd->cpu)) | |
5920 | smp_call_function_single_async(remsd->cpu, &remsd->csd); | |
5921 | remsd = next; | |
5922 | } | |
5923 | #endif | |
5924 | } | |
5925 | ||
e326bed2 | 5926 | /* |
855abcf0 | 5927 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
5928 | * Note: called with local irq disabled, but exits with local irq enabled. |
5929 | */ | |
5930 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
5931 | { | |
5932 | #ifdef CONFIG_RPS | |
5933 | struct softnet_data *remsd = sd->rps_ipi_list; | |
5934 | ||
5935 | if (remsd) { | |
5936 | sd->rps_ipi_list = NULL; | |
5937 | ||
5938 | local_irq_enable(); | |
5939 | ||
5940 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
773fc8f6 | 5941 | net_rps_send_ipi(remsd); |
e326bed2 ED |
5942 | } else |
5943 | #endif | |
5944 | local_irq_enable(); | |
5945 | } | |
5946 | ||
d75b1ade ED |
5947 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
5948 | { | |
5949 | #ifdef CONFIG_RPS | |
5950 | return sd->rps_ipi_list != NULL; | |
5951 | #else | |
5952 | return false; | |
5953 | #endif | |
5954 | } | |
5955 | ||
bea3348e | 5956 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 | 5957 | { |
eecfd7c4 | 5958 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
145dd5f9 PA |
5959 | bool again = true; |
5960 | int work = 0; | |
1da177e4 | 5961 | |
e326bed2 ED |
5962 | /* Check if we have pending ipi, its better to send them now, |
5963 | * not waiting net_rx_action() end. | |
5964 | */ | |
d75b1ade | 5965 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
5966 | local_irq_disable(); |
5967 | net_rps_action_and_irq_enable(sd); | |
5968 | } | |
d75b1ade | 5969 | |
bf955b5a | 5970 | napi->weight = READ_ONCE(dev_rx_weight); |
145dd5f9 | 5971 | while (again) { |
1da177e4 | 5972 | struct sk_buff *skb; |
6e7676c1 CG |
5973 | |
5974 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
2c17d27c | 5975 | rcu_read_lock(); |
6e7676c1 | 5976 | __netif_receive_skb(skb); |
2c17d27c | 5977 | rcu_read_unlock(); |
76cc8b13 | 5978 | input_queue_head_incr(sd); |
145dd5f9 | 5979 | if (++work >= quota) |
76cc8b13 | 5980 | return work; |
145dd5f9 | 5981 | |
6e7676c1 | 5982 | } |
1da177e4 | 5983 | |
e722db8d | 5984 | rps_lock_irq_disable(sd); |
11ef7a89 | 5985 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
5986 | /* |
5987 | * Inline a custom version of __napi_complete(). | |
5988 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
5989 | * and NAPI_STATE_SCHED is the only possible flag set |
5990 | * on backlog. | |
5991 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
5992 | * and we dont need an smp_mb() memory barrier. |
5993 | */ | |
eecfd7c4 | 5994 | napi->state = 0; |
145dd5f9 PA |
5995 | again = false; |
5996 | } else { | |
5997 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
5998 | &sd->process_queue); | |
bea3348e | 5999 | } |
e722db8d | 6000 | rps_unlock_irq_enable(sd); |
6e7676c1 | 6001 | } |
1da177e4 | 6002 | |
bea3348e SH |
6003 | return work; |
6004 | } | |
1da177e4 | 6005 | |
bea3348e SH |
6006 | /** |
6007 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 6008 | * @n: entry to schedule |
bea3348e | 6009 | * |
bc9ad166 ED |
6010 | * The entry's receive function will be scheduled to run. |
6011 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 6012 | */ |
b5606c2d | 6013 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
6014 | { |
6015 | unsigned long flags; | |
1da177e4 | 6016 | |
bea3348e | 6017 | local_irq_save(flags); |
903ceff7 | 6018 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 6019 | local_irq_restore(flags); |
1da177e4 | 6020 | } |
bea3348e SH |
6021 | EXPORT_SYMBOL(__napi_schedule); |
6022 | ||
39e6c820 ED |
6023 | /** |
6024 | * napi_schedule_prep - check if napi can be scheduled | |
6025 | * @n: napi context | |
6026 | * | |
6027 | * Test if NAPI routine is already running, and if not mark | |
ee1a4c84 | 6028 | * it as running. This is used as a condition variable to |
39e6c820 ED |
6029 | * insure only one NAPI poll instance runs. We also make |
6030 | * sure there is no pending NAPI disable. | |
6031 | */ | |
6032 | bool napi_schedule_prep(struct napi_struct *n) | |
6033 | { | |
1462160c | 6034 | unsigned long new, val = READ_ONCE(n->state); |
39e6c820 ED |
6035 | |
6036 | do { | |
39e6c820 ED |
6037 | if (unlikely(val & NAPIF_STATE_DISABLE)) |
6038 | return false; | |
6039 | new = val | NAPIF_STATE_SCHED; | |
6040 | ||
6041 | /* Sets STATE_MISSED bit if STATE_SCHED was already set | |
6042 | * This was suggested by Alexander Duyck, as compiler | |
6043 | * emits better code than : | |
6044 | * if (val & NAPIF_STATE_SCHED) | |
6045 | * new |= NAPIF_STATE_MISSED; | |
6046 | */ | |
6047 | new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * | |
6048 | NAPIF_STATE_MISSED; | |
1462160c | 6049 | } while (!try_cmpxchg(&n->state, &val, new)); |
39e6c820 ED |
6050 | |
6051 | return !(val & NAPIF_STATE_SCHED); | |
6052 | } | |
6053 | EXPORT_SYMBOL(napi_schedule_prep); | |
6054 | ||
bc9ad166 ED |
6055 | /** |
6056 | * __napi_schedule_irqoff - schedule for receive | |
6057 | * @n: entry to schedule | |
6058 | * | |
8380c81d SAS |
6059 | * Variant of __napi_schedule() assuming hard irqs are masked. |
6060 | * | |
6061 | * On PREEMPT_RT enabled kernels this maps to __napi_schedule() | |
6062 | * because the interrupt disabled assumption might not be true | |
6063 | * due to force-threaded interrupts and spinlock substitution. | |
bc9ad166 ED |
6064 | */ |
6065 | void __napi_schedule_irqoff(struct napi_struct *n) | |
6066 | { | |
8380c81d SAS |
6067 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
6068 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
6069 | else | |
6070 | __napi_schedule(n); | |
bc9ad166 ED |
6071 | } |
6072 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
6073 | ||
364b6055 | 6074 | bool napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 | 6075 | { |
6f8b12d6 ED |
6076 | unsigned long flags, val, new, timeout = 0; |
6077 | bool ret = true; | |
d565b0a1 HX |
6078 | |
6079 | /* | |
217f6974 ED |
6080 | * 1) Don't let napi dequeue from the cpu poll list |
6081 | * just in case its running on a different cpu. | |
6082 | * 2) If we are busy polling, do nothing here, we have | |
6083 | * the guarantee we will be called later. | |
d565b0a1 | 6084 | */ |
217f6974 ED |
6085 | if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
6086 | NAPIF_STATE_IN_BUSY_POLL))) | |
364b6055 | 6087 | return false; |
d565b0a1 | 6088 | |
6f8b12d6 ED |
6089 | if (work_done) { |
6090 | if (n->gro_bitmask) | |
7e417a66 ED |
6091 | timeout = READ_ONCE(n->dev->gro_flush_timeout); |
6092 | n->defer_hard_irqs_count = READ_ONCE(n->dev->napi_defer_hard_irqs); | |
6f8b12d6 ED |
6093 | } |
6094 | if (n->defer_hard_irqs_count > 0) { | |
6095 | n->defer_hard_irqs_count--; | |
7e417a66 | 6096 | timeout = READ_ONCE(n->dev->gro_flush_timeout); |
6f8b12d6 ED |
6097 | if (timeout) |
6098 | ret = false; | |
6099 | } | |
6100 | if (n->gro_bitmask) { | |
605108ac PA |
6101 | /* When the NAPI instance uses a timeout and keeps postponing |
6102 | * it, we need to bound somehow the time packets are kept in | |
6103 | * the GRO layer | |
6104 | */ | |
6105 | napi_gro_flush(n, !!timeout); | |
3b47d303 | 6106 | } |
c8079432 MM |
6107 | |
6108 | gro_normal_list(n); | |
6109 | ||
02c1602e | 6110 | if (unlikely(!list_empty(&n->poll_list))) { |
d75b1ade ED |
6111 | /* If n->poll_list is not empty, we need to mask irqs */ |
6112 | local_irq_save(flags); | |
02c1602e | 6113 | list_del_init(&n->poll_list); |
d75b1ade ED |
6114 | local_irq_restore(flags); |
6115 | } | |
8c48eea3 | 6116 | WRITE_ONCE(n->list_owner, -1); |
39e6c820 | 6117 | |
1462160c | 6118 | val = READ_ONCE(n->state); |
39e6c820 | 6119 | do { |
39e6c820 ED |
6120 | WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); |
6121 | ||
7fd3253a | 6122 | new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED | |
cb038357 | 6123 | NAPIF_STATE_SCHED_THREADED | |
7fd3253a | 6124 | NAPIF_STATE_PREFER_BUSY_POLL); |
39e6c820 ED |
6125 | |
6126 | /* If STATE_MISSED was set, leave STATE_SCHED set, | |
6127 | * because we will call napi->poll() one more time. | |
6128 | * This C code was suggested by Alexander Duyck to help gcc. | |
6129 | */ | |
6130 | new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * | |
6131 | NAPIF_STATE_SCHED; | |
1462160c | 6132 | } while (!try_cmpxchg(&n->state, &val, new)); |
39e6c820 ED |
6133 | |
6134 | if (unlikely(val & NAPIF_STATE_MISSED)) { | |
6135 | __napi_schedule(n); | |
6136 | return false; | |
6137 | } | |
6138 | ||
6f8b12d6 ED |
6139 | if (timeout) |
6140 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
6141 | HRTIMER_MODE_REL_PINNED); | |
6142 | return ret; | |
d565b0a1 | 6143 | } |
3b47d303 | 6144 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 6145 | |
af12fa6e | 6146 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
27f91aaf | 6147 | struct napi_struct *napi_by_id(unsigned int napi_id) |
af12fa6e ET |
6148 | { |
6149 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
6150 | struct napi_struct *napi; | |
6151 | ||
6152 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
6153 | if (napi->napi_id == napi_id) | |
6154 | return napi; | |
6155 | ||
6156 | return NULL; | |
6157 | } | |
02d62e86 ED |
6158 | |
6159 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
217f6974 | 6160 | |
7fd3253a | 6161 | static void __busy_poll_stop(struct napi_struct *napi, bool skip_schedule) |
217f6974 | 6162 | { |
7fd3253a BT |
6163 | if (!skip_schedule) { |
6164 | gro_normal_list(napi); | |
6165 | __napi_schedule(napi); | |
6166 | return; | |
6167 | } | |
217f6974 | 6168 | |
7fd3253a BT |
6169 | if (napi->gro_bitmask) { |
6170 | /* flush too old packets | |
6171 | * If HZ < 1000, flush all packets. | |
6172 | */ | |
6173 | napi_gro_flush(napi, HZ >= 1000); | |
6174 | } | |
217f6974 | 6175 | |
7fd3253a BT |
6176 | gro_normal_list(napi); |
6177 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
6178 | } | |
6179 | ||
7c951caf BT |
6180 | static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock, bool prefer_busy_poll, |
6181 | u16 budget) | |
217f6974 | 6182 | { |
7fd3253a BT |
6183 | bool skip_schedule = false; |
6184 | unsigned long timeout; | |
217f6974 ED |
6185 | int rc; |
6186 | ||
39e6c820 ED |
6187 | /* Busy polling means there is a high chance device driver hard irq |
6188 | * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was | |
6189 | * set in napi_schedule_prep(). | |
6190 | * Since we are about to call napi->poll() once more, we can safely | |
6191 | * clear NAPI_STATE_MISSED. | |
6192 | * | |
6193 | * Note: x86 could use a single "lock and ..." instruction | |
6194 | * to perform these two clear_bit() | |
6195 | */ | |
6196 | clear_bit(NAPI_STATE_MISSED, &napi->state); | |
217f6974 ED |
6197 | clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
6198 | ||
6199 | local_bh_disable(); | |
6200 | ||
7fd3253a BT |
6201 | if (prefer_busy_poll) { |
6202 | napi->defer_hard_irqs_count = READ_ONCE(napi->dev->napi_defer_hard_irqs); | |
6203 | timeout = READ_ONCE(napi->dev->gro_flush_timeout); | |
6204 | if (napi->defer_hard_irqs_count && timeout) { | |
6205 | hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); | |
6206 | skip_schedule = true; | |
6207 | } | |
6208 | } | |
6209 | ||
217f6974 ED |
6210 | /* All we really want here is to re-enable device interrupts. |
6211 | * Ideally, a new ndo_busy_poll_stop() could avoid another round. | |
6212 | */ | |
7c951caf | 6213 | rc = napi->poll(napi, budget); |
323ebb61 EC |
6214 | /* We can't gro_normal_list() here, because napi->poll() might have |
6215 | * rearmed the napi (napi_complete_done()) in which case it could | |
6216 | * already be running on another CPU. | |
6217 | */ | |
7c951caf | 6218 | trace_napi_poll(napi, rc, budget); |
217f6974 | 6219 | netpoll_poll_unlock(have_poll_lock); |
7c951caf | 6220 | if (rc == budget) |
7fd3253a | 6221 | __busy_poll_stop(napi, skip_schedule); |
217f6974 | 6222 | local_bh_enable(); |
217f6974 ED |
6223 | } |
6224 | ||
7db6b048 SS |
6225 | void napi_busy_loop(unsigned int napi_id, |
6226 | bool (*loop_end)(void *, unsigned long), | |
7c951caf | 6227 | void *loop_end_arg, bool prefer_busy_poll, u16 budget) |
02d62e86 | 6228 | { |
7db6b048 | 6229 | unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
217f6974 | 6230 | int (*napi_poll)(struct napi_struct *napi, int budget); |
217f6974 | 6231 | void *have_poll_lock = NULL; |
02d62e86 | 6232 | struct napi_struct *napi; |
217f6974 ED |
6233 | |
6234 | restart: | |
217f6974 | 6235 | napi_poll = NULL; |
02d62e86 | 6236 | |
2a028ecb | 6237 | rcu_read_lock(); |
02d62e86 | 6238 | |
545cd5e5 | 6239 | napi = napi_by_id(napi_id); |
02d62e86 ED |
6240 | if (!napi) |
6241 | goto out; | |
6242 | ||
c857946a KK |
6243 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
6244 | preempt_disable(); | |
217f6974 | 6245 | for (;;) { |
2b5cd0df AD |
6246 | int work = 0; |
6247 | ||
2a028ecb | 6248 | local_bh_disable(); |
217f6974 ED |
6249 | if (!napi_poll) { |
6250 | unsigned long val = READ_ONCE(napi->state); | |
6251 | ||
6252 | /* If multiple threads are competing for this napi, | |
6253 | * we avoid dirtying napi->state as much as we can. | |
6254 | */ | |
6255 | if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | | |
7fd3253a BT |
6256 | NAPIF_STATE_IN_BUSY_POLL)) { |
6257 | if (prefer_busy_poll) | |
6258 | set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
217f6974 | 6259 | goto count; |
7fd3253a | 6260 | } |
217f6974 ED |
6261 | if (cmpxchg(&napi->state, val, |
6262 | val | NAPIF_STATE_IN_BUSY_POLL | | |
7fd3253a BT |
6263 | NAPIF_STATE_SCHED) != val) { |
6264 | if (prefer_busy_poll) | |
6265 | set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
217f6974 | 6266 | goto count; |
7fd3253a | 6267 | } |
217f6974 ED |
6268 | have_poll_lock = netpoll_poll_lock(napi); |
6269 | napi_poll = napi->poll; | |
6270 | } | |
7c951caf BT |
6271 | work = napi_poll(napi, budget); |
6272 | trace_napi_poll(napi, work, budget); | |
323ebb61 | 6273 | gro_normal_list(napi); |
217f6974 | 6274 | count: |
2b5cd0df | 6275 | if (work > 0) |
7db6b048 | 6276 | __NET_ADD_STATS(dev_net(napi->dev), |
2b5cd0df | 6277 | LINUX_MIB_BUSYPOLLRXPACKETS, work); |
2a028ecb | 6278 | local_bh_enable(); |
02d62e86 | 6279 | |
7db6b048 | 6280 | if (!loop_end || loop_end(loop_end_arg, start_time)) |
217f6974 | 6281 | break; |
02d62e86 | 6282 | |
217f6974 ED |
6283 | if (unlikely(need_resched())) { |
6284 | if (napi_poll) | |
7c951caf | 6285 | busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
c857946a KK |
6286 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
6287 | preempt_enable(); | |
217f6974 ED |
6288 | rcu_read_unlock(); |
6289 | cond_resched(); | |
7db6b048 | 6290 | if (loop_end(loop_end_arg, start_time)) |
2b5cd0df | 6291 | return; |
217f6974 ED |
6292 | goto restart; |
6293 | } | |
6cdf89b1 | 6294 | cpu_relax(); |
217f6974 ED |
6295 | } |
6296 | if (napi_poll) | |
7c951caf | 6297 | busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
c857946a KK |
6298 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
6299 | preempt_enable(); | |
02d62e86 | 6300 | out: |
2a028ecb | 6301 | rcu_read_unlock(); |
02d62e86 | 6302 | } |
7db6b048 | 6303 | EXPORT_SYMBOL(napi_busy_loop); |
02d62e86 ED |
6304 | |
6305 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
af12fa6e | 6306 | |
149d6ad8 | 6307 | static void napi_hash_add(struct napi_struct *napi) |
af12fa6e | 6308 | { |
4d092dd2 | 6309 | if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state)) |
52bd2d62 | 6310 | return; |
af12fa6e | 6311 | |
52bd2d62 | 6312 | spin_lock(&napi_hash_lock); |
af12fa6e | 6313 | |
545cd5e5 | 6314 | /* 0..NR_CPUS range is reserved for sender_cpu use */ |
52bd2d62 | 6315 | do { |
545cd5e5 AD |
6316 | if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
6317 | napi_gen_id = MIN_NAPI_ID; | |
52bd2d62 ED |
6318 | } while (napi_by_id(napi_gen_id)); |
6319 | napi->napi_id = napi_gen_id; | |
af12fa6e | 6320 | |
52bd2d62 ED |
6321 | hlist_add_head_rcu(&napi->napi_hash_node, |
6322 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
af12fa6e | 6323 | |
52bd2d62 | 6324 | spin_unlock(&napi_hash_lock); |
af12fa6e | 6325 | } |
af12fa6e ET |
6326 | |
6327 | /* Warning : caller is responsible to make sure rcu grace period | |
6328 | * is respected before freeing memory containing @napi | |
6329 | */ | |
5198d545 | 6330 | static void napi_hash_del(struct napi_struct *napi) |
af12fa6e ET |
6331 | { |
6332 | spin_lock(&napi_hash_lock); | |
6333 | ||
4d092dd2 | 6334 | hlist_del_init_rcu(&napi->napi_hash_node); |
5198d545 | 6335 | |
af12fa6e ET |
6336 | spin_unlock(&napi_hash_lock); |
6337 | } | |
af12fa6e | 6338 | |
3b47d303 ED |
6339 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
6340 | { | |
6341 | struct napi_struct *napi; | |
6342 | ||
6343 | napi = container_of(timer, struct napi_struct, timer); | |
39e6c820 ED |
6344 | |
6345 | /* Note : we use a relaxed variant of napi_schedule_prep() not setting | |
6346 | * NAPI_STATE_MISSED, since we do not react to a device IRQ. | |
6347 | */ | |
6f8b12d6 | 6348 | if (!napi_disable_pending(napi) && |
7fd3253a BT |
6349 | !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) { |
6350 | clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
39e6c820 | 6351 | __napi_schedule_irqoff(napi); |
7fd3253a | 6352 | } |
3b47d303 ED |
6353 | |
6354 | return HRTIMER_NORESTART; | |
6355 | } | |
6356 | ||
7c4ec749 | 6357 | static void init_gro_hash(struct napi_struct *napi) |
d565b0a1 | 6358 | { |
07d78363 DM |
6359 | int i; |
6360 | ||
6312fe77 LR |
6361 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6362 | INIT_LIST_HEAD(&napi->gro_hash[i].list); | |
6363 | napi->gro_hash[i].count = 0; | |
6364 | } | |
7c4ec749 DM |
6365 | napi->gro_bitmask = 0; |
6366 | } | |
6367 | ||
5fdd2f0e WW |
6368 | int dev_set_threaded(struct net_device *dev, bool threaded) |
6369 | { | |
6370 | struct napi_struct *napi; | |
6371 | int err = 0; | |
6372 | ||
6373 | if (dev->threaded == threaded) | |
6374 | return 0; | |
6375 | ||
6376 | if (threaded) { | |
6377 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
6378 | if (!napi->thread) { | |
6379 | err = napi_kthread_create(napi); | |
6380 | if (err) { | |
6381 | threaded = false; | |
6382 | break; | |
6383 | } | |
6384 | } | |
6385 | } | |
6386 | } | |
6387 | ||
6388 | dev->threaded = threaded; | |
6389 | ||
6390 | /* Make sure kthread is created before THREADED bit | |
6391 | * is set. | |
6392 | */ | |
6393 | smp_mb__before_atomic(); | |
6394 | ||
6395 | /* Setting/unsetting threaded mode on a napi might not immediately | |
6396 | * take effect, if the current napi instance is actively being | |
6397 | * polled. In this case, the switch between threaded mode and | |
6398 | * softirq mode will happen in the next round of napi_schedule(). | |
6399 | * This should not cause hiccups/stalls to the live traffic. | |
6400 | */ | |
274c4a6d AS |
6401 | list_for_each_entry(napi, &dev->napi_list, dev_list) |
6402 | assign_bit(NAPI_STATE_THREADED, &napi->state, threaded); | |
5fdd2f0e WW |
6403 | |
6404 | return err; | |
6405 | } | |
8f64860f | 6406 | EXPORT_SYMBOL(dev_set_threaded); |
5fdd2f0e | 6407 | |
2a502ff0 AN |
6408 | /** |
6409 | * netif_queue_set_napi - Associate queue with the napi | |
6410 | * @dev: device to which NAPI and queue belong | |
6411 | * @queue_index: Index of queue | |
6412 | * @type: queue type as RX or TX | |
6413 | * @napi: NAPI context, pass NULL to clear previously set NAPI | |
6414 | * | |
6415 | * Set queue with its corresponding napi context. This should be done after | |
6416 | * registering the NAPI handler for the queue-vector and the queues have been | |
6417 | * mapped to the corresponding interrupt vector. | |
6418 | */ | |
6419 | void netif_queue_set_napi(struct net_device *dev, unsigned int queue_index, | |
6420 | enum netdev_queue_type type, struct napi_struct *napi) | |
6421 | { | |
6422 | struct netdev_rx_queue *rxq; | |
6423 | struct netdev_queue *txq; | |
6424 | ||
6425 | if (WARN_ON_ONCE(napi && !napi->dev)) | |
6426 | return; | |
6427 | if (dev->reg_state >= NETREG_REGISTERED) | |
6428 | ASSERT_RTNL(); | |
6429 | ||
6430 | switch (type) { | |
6431 | case NETDEV_QUEUE_TYPE_RX: | |
6432 | rxq = __netif_get_rx_queue(dev, queue_index); | |
6433 | rxq->napi = napi; | |
6434 | return; | |
6435 | case NETDEV_QUEUE_TYPE_TX: | |
6436 | txq = netdev_get_tx_queue(dev, queue_index); | |
6437 | txq->napi = napi; | |
6438 | return; | |
6439 | default: | |
6440 | return; | |
6441 | } | |
6442 | } | |
6443 | EXPORT_SYMBOL(netif_queue_set_napi); | |
6444 | ||
58caed3d JK |
6445 | void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi, |
6446 | int (*poll)(struct napi_struct *, int), int weight) | |
7c4ec749 | 6447 | { |
4d092dd2 JK |
6448 | if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state))) |
6449 | return; | |
6450 | ||
7c4ec749 | 6451 | INIT_LIST_HEAD(&napi->poll_list); |
4d092dd2 | 6452 | INIT_HLIST_NODE(&napi->napi_hash_node); |
7c4ec749 DM |
6453 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
6454 | napi->timer.function = napi_watchdog; | |
6455 | init_gro_hash(napi); | |
5d38a079 | 6456 | napi->skb = NULL; |
323ebb61 EC |
6457 | INIT_LIST_HEAD(&napi->rx_list); |
6458 | napi->rx_count = 0; | |
d565b0a1 | 6459 | napi->poll = poll; |
82dc3c63 | 6460 | if (weight > NAPI_POLL_WEIGHT) |
bf29e9e9 QC |
6461 | netdev_err_once(dev, "%s() called with weight %d\n", __func__, |
6462 | weight); | |
d565b0a1 | 6463 | napi->weight = weight; |
d565b0a1 | 6464 | napi->dev = dev; |
5d38a079 | 6465 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
6466 | napi->poll_owner = -1; |
6467 | #endif | |
8c48eea3 | 6468 | napi->list_owner = -1; |
d565b0a1 | 6469 | set_bit(NAPI_STATE_SCHED, &napi->state); |
96e97bc0 JK |
6470 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
6471 | list_add_rcu(&napi->dev_list, &dev->napi_list); | |
93d05d4a | 6472 | napi_hash_add(napi); |
fd9ea57f | 6473 | napi_get_frags_check(napi); |
29863d41 WW |
6474 | /* Create kthread for this napi if dev->threaded is set. |
6475 | * Clear dev->threaded if kthread creation failed so that | |
6476 | * threaded mode will not be enabled in napi_enable(). | |
6477 | */ | |
6478 | if (dev->threaded && napi_kthread_create(napi)) | |
6479 | dev->threaded = 0; | |
26793bfb | 6480 | netif_napi_set_irq(napi, -1); |
d565b0a1 | 6481 | } |
58caed3d | 6482 | EXPORT_SYMBOL(netif_napi_add_weight); |
d565b0a1 | 6483 | |
3b47d303 ED |
6484 | void napi_disable(struct napi_struct *n) |
6485 | { | |
719c5719 JK |
6486 | unsigned long val, new; |
6487 | ||
3b47d303 ED |
6488 | might_sleep(); |
6489 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
6490 | ||
4ffa1d1c ED |
6491 | val = READ_ONCE(n->state); |
6492 | do { | |
fd896e38 | 6493 | while (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) { |
719c5719 | 6494 | usleep_range(20, 200); |
fd896e38 | 6495 | val = READ_ONCE(n->state); |
719c5719 JK |
6496 | } |
6497 | ||
6498 | new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC; | |
6499 | new &= ~(NAPIF_STATE_THREADED | NAPIF_STATE_PREFER_BUSY_POLL); | |
4ffa1d1c | 6500 | } while (!try_cmpxchg(&n->state, &val, new)); |
3b47d303 ED |
6501 | |
6502 | hrtimer_cancel(&n->timer); | |
6503 | ||
6504 | clear_bit(NAPI_STATE_DISABLE, &n->state); | |
6505 | } | |
6506 | EXPORT_SYMBOL(napi_disable); | |
6507 | ||
29863d41 WW |
6508 | /** |
6509 | * napi_enable - enable NAPI scheduling | |
6510 | * @n: NAPI context | |
6511 | * | |
6512 | * Resume NAPI from being scheduled on this context. | |
6513 | * Must be paired with napi_disable. | |
6514 | */ | |
6515 | void napi_enable(struct napi_struct *n) | |
6516 | { | |
4ffa1d1c | 6517 | unsigned long new, val = READ_ONCE(n->state); |
3765996e XZ |
6518 | |
6519 | do { | |
3765996e XZ |
6520 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &val)); |
6521 | ||
6522 | new = val & ~(NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC); | |
6523 | if (n->dev->threaded && n->thread) | |
6524 | new |= NAPIF_STATE_THREADED; | |
4ffa1d1c | 6525 | } while (!try_cmpxchg(&n->state, &val, new)); |
29863d41 WW |
6526 | } |
6527 | EXPORT_SYMBOL(napi_enable); | |
6528 | ||
07d78363 | 6529 | static void flush_gro_hash(struct napi_struct *napi) |
d4546c25 | 6530 | { |
07d78363 | 6531 | int i; |
d4546c25 | 6532 | |
07d78363 DM |
6533 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6534 | struct sk_buff *skb, *n; | |
6535 | ||
6312fe77 | 6536 | list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list) |
07d78363 | 6537 | kfree_skb(skb); |
6312fe77 | 6538 | napi->gro_hash[i].count = 0; |
07d78363 | 6539 | } |
d4546c25 DM |
6540 | } |
6541 | ||
93d05d4a | 6542 | /* Must be called in process context */ |
5198d545 | 6543 | void __netif_napi_del(struct napi_struct *napi) |
d565b0a1 | 6544 | { |
4d092dd2 JK |
6545 | if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state)) |
6546 | return; | |
6547 | ||
5198d545 | 6548 | napi_hash_del(napi); |
5251ef82 | 6549 | list_del_rcu(&napi->dev_list); |
76620aaf | 6550 | napi_free_frags(napi); |
d565b0a1 | 6551 | |
07d78363 | 6552 | flush_gro_hash(napi); |
d9f37d01 | 6553 | napi->gro_bitmask = 0; |
29863d41 WW |
6554 | |
6555 | if (napi->thread) { | |
6556 | kthread_stop(napi->thread); | |
6557 | napi->thread = NULL; | |
6558 | } | |
d565b0a1 | 6559 | } |
5198d545 | 6560 | EXPORT_SYMBOL(__netif_napi_del); |
d565b0a1 | 6561 | |
898f8015 | 6562 | static int __napi_poll(struct napi_struct *n, bool *repoll) |
726ce70e | 6563 | { |
726ce70e HX |
6564 | int work, weight; |
6565 | ||
726ce70e HX |
6566 | weight = n->weight; |
6567 | ||
6568 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
6569 | * with netpoll's poll_napi(). Only the entity which | |
6570 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
6571 | * actually make the ->poll() call. Therefore we avoid | |
6572 | * accidentally calling ->poll() when NAPI is not scheduled. | |
6573 | */ | |
6574 | work = 0; | |
7f3eb217 | 6575 | if (napi_is_scheduled(n)) { |
726ce70e | 6576 | work = n->poll(n, weight); |
1db19db7 | 6577 | trace_napi_poll(n, work, weight); |
9a675ba5 SAS |
6578 | |
6579 | xdp_do_check_flushed(n); | |
726ce70e HX |
6580 | } |
6581 | ||
427d5838 | 6582 | if (unlikely(work > weight)) |
5b92be64 JB |
6583 | netdev_err_once(n->dev, "NAPI poll function %pS returned %d, exceeding its budget of %d.\n", |
6584 | n->poll, work, weight); | |
726ce70e HX |
6585 | |
6586 | if (likely(work < weight)) | |
898f8015 | 6587 | return work; |
726ce70e HX |
6588 | |
6589 | /* Drivers must not modify the NAPI state if they | |
6590 | * consume the entire weight. In such cases this code | |
6591 | * still "owns" the NAPI instance and therefore can | |
6592 | * move the instance around on the list at-will. | |
6593 | */ | |
6594 | if (unlikely(napi_disable_pending(n))) { | |
6595 | napi_complete(n); | |
898f8015 | 6596 | return work; |
726ce70e HX |
6597 | } |
6598 | ||
7fd3253a BT |
6599 | /* The NAPI context has more processing work, but busy-polling |
6600 | * is preferred. Exit early. | |
6601 | */ | |
6602 | if (napi_prefer_busy_poll(n)) { | |
6603 | if (napi_complete_done(n, work)) { | |
6604 | /* If timeout is not set, we need to make sure | |
6605 | * that the NAPI is re-scheduled. | |
6606 | */ | |
6607 | napi_schedule(n); | |
6608 | } | |
898f8015 | 6609 | return work; |
7fd3253a BT |
6610 | } |
6611 | ||
d9f37d01 | 6612 | if (n->gro_bitmask) { |
726ce70e HX |
6613 | /* flush too old packets |
6614 | * If HZ < 1000, flush all packets. | |
6615 | */ | |
6616 | napi_gro_flush(n, HZ >= 1000); | |
6617 | } | |
6618 | ||
c8079432 MM |
6619 | gro_normal_list(n); |
6620 | ||
001ce546 HX |
6621 | /* Some drivers may have called napi_schedule |
6622 | * prior to exhausting their budget. | |
6623 | */ | |
6624 | if (unlikely(!list_empty(&n->poll_list))) { | |
6625 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
6626 | n->dev ? n->dev->name : "backlog"); | |
898f8015 | 6627 | return work; |
001ce546 HX |
6628 | } |
6629 | ||
898f8015 FF |
6630 | *repoll = true; |
6631 | ||
6632 | return work; | |
6633 | } | |
6634 | ||
6635 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) | |
6636 | { | |
6637 | bool do_repoll = false; | |
6638 | void *have; | |
6639 | int work; | |
6640 | ||
6641 | list_del_init(&n->poll_list); | |
6642 | ||
6643 | have = netpoll_poll_lock(n); | |
6644 | ||
6645 | work = __napi_poll(n, &do_repoll); | |
6646 | ||
6647 | if (do_repoll) | |
6648 | list_add_tail(&n->poll_list, repoll); | |
726ce70e | 6649 | |
726ce70e HX |
6650 | netpoll_poll_unlock(have); |
6651 | ||
6652 | return work; | |
6653 | } | |
6654 | ||
29863d41 WW |
6655 | static int napi_thread_wait(struct napi_struct *napi) |
6656 | { | |
cb038357 WW |
6657 | bool woken = false; |
6658 | ||
29863d41 WW |
6659 | set_current_state(TASK_INTERRUPTIBLE); |
6660 | ||
27f0ad71 | 6661 | while (!kthread_should_stop()) { |
cb038357 WW |
6662 | /* Testing SCHED_THREADED bit here to make sure the current |
6663 | * kthread owns this napi and could poll on this napi. | |
6664 | * Testing SCHED bit is not enough because SCHED bit might be | |
6665 | * set by some other busy poll thread or by napi_disable(). | |
6666 | */ | |
6667 | if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state) || woken) { | |
29863d41 WW |
6668 | WARN_ON(!list_empty(&napi->poll_list)); |
6669 | __set_current_state(TASK_RUNNING); | |
6670 | return 0; | |
6671 | } | |
6672 | ||
6673 | schedule(); | |
cb038357 WW |
6674 | /* woken being true indicates this thread owns this napi. */ |
6675 | woken = true; | |
29863d41 WW |
6676 | set_current_state(TASK_INTERRUPTIBLE); |
6677 | } | |
6678 | __set_current_state(TASK_RUNNING); | |
27f0ad71 | 6679 | |
29863d41 WW |
6680 | return -1; |
6681 | } | |
6682 | ||
e6f50edf ED |
6683 | static void skb_defer_free_flush(struct softnet_data *sd) |
6684 | { | |
6685 | struct sk_buff *skb, *next; | |
6686 | ||
6687 | /* Paired with WRITE_ONCE() in skb_attempt_defer_free() */ | |
6688 | if (!READ_ONCE(sd->defer_list)) | |
6689 | return; | |
6690 | ||
6691 | spin_lock(&sd->defer_lock); | |
6692 | skb = sd->defer_list; | |
6693 | sd->defer_list = NULL; | |
6694 | sd->defer_count = 0; | |
6695 | spin_unlock(&sd->defer_lock); | |
6696 | ||
6697 | while (skb != NULL) { | |
6698 | next = skb->next; | |
6699 | napi_consume_skb(skb, 1); | |
6700 | skb = next; | |
6701 | } | |
6702 | } | |
6703 | ||
29863d41 WW |
6704 | static int napi_threaded_poll(void *data) |
6705 | { | |
6706 | struct napi_struct *napi = data; | |
a1aaee7f | 6707 | struct softnet_data *sd; |
29863d41 WW |
6708 | void *have; |
6709 | ||
6710 | while (!napi_thread_wait(napi)) { | |
6711 | for (;;) { | |
6712 | bool repoll = false; | |
6713 | ||
6714 | local_bh_disable(); | |
a1aaee7f | 6715 | sd = this_cpu_ptr(&softnet_data); |
87eff2ec | 6716 | sd->in_napi_threaded_poll = true; |
29863d41 WW |
6717 | |
6718 | have = netpoll_poll_lock(napi); | |
6719 | __napi_poll(napi, &repoll); | |
6720 | netpoll_poll_unlock(have); | |
6721 | ||
87eff2ec ED |
6722 | sd->in_napi_threaded_poll = false; |
6723 | barrier(); | |
6724 | ||
6725 | if (sd_has_rps_ipi_waiting(sd)) { | |
6726 | local_irq_disable(); | |
6727 | net_rps_action_and_irq_enable(sd); | |
6728 | } | |
a1aaee7f | 6729 | skb_defer_free_flush(sd); |
29863d41 WW |
6730 | local_bh_enable(); |
6731 | ||
6732 | if (!repoll) | |
6733 | break; | |
6734 | ||
6735 | cond_resched(); | |
6736 | } | |
6737 | } | |
6738 | return 0; | |
6739 | } | |
6740 | ||
0766f788 | 6741 | static __latent_entropy void net_rx_action(struct softirq_action *h) |
1da177e4 | 6742 | { |
903ceff7 | 6743 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
7acf8a1e | 6744 | unsigned long time_limit = jiffies + |
fa45d484 | 6745 | usecs_to_jiffies(READ_ONCE(netdev_budget_usecs)); |
2e0c4237 | 6746 | int budget = READ_ONCE(netdev_budget); |
d75b1ade ED |
6747 | LIST_HEAD(list); |
6748 | LIST_HEAD(repoll); | |
53fb95d3 | 6749 | |
8b43fd3d | 6750 | start: |
c59647c0 | 6751 | sd->in_net_rx_action = true; |
1da177e4 | 6752 | local_irq_disable(); |
d75b1ade ED |
6753 | list_splice_init(&sd->poll_list, &list); |
6754 | local_irq_enable(); | |
1da177e4 | 6755 | |
ceb8d5bf | 6756 | for (;;) { |
bea3348e | 6757 | struct napi_struct *n; |
1da177e4 | 6758 | |
90987650 ED |
6759 | skb_defer_free_flush(sd); |
6760 | ||
ceb8d5bf | 6761 | if (list_empty(&list)) { |
8b43fd3d ED |
6762 | if (list_empty(&repoll)) { |
6763 | sd->in_net_rx_action = false; | |
6764 | barrier(); | |
6765 | /* We need to check if ____napi_schedule() | |
6766 | * had refilled poll_list while | |
6767 | * sd->in_net_rx_action was true. | |
6768 | */ | |
6769 | if (!list_empty(&sd->poll_list)) | |
6770 | goto start; | |
6771 | if (!sd_has_rps_ipi_waiting(sd)) | |
6772 | goto end; | |
6773 | } | |
ceb8d5bf HX |
6774 | break; |
6775 | } | |
6776 | ||
6bd373eb HX |
6777 | n = list_first_entry(&list, struct napi_struct, poll_list); |
6778 | budget -= napi_poll(n, &repoll); | |
6779 | ||
d75b1ade | 6780 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
6781 | * Allow this to run for 2 jiffies since which will allow |
6782 | * an average latency of 1.5/HZ. | |
bea3348e | 6783 | */ |
ceb8d5bf HX |
6784 | if (unlikely(budget <= 0 || |
6785 | time_after_eq(jiffies, time_limit))) { | |
6786 | sd->time_squeeze++; | |
6787 | break; | |
6788 | } | |
1da177e4 | 6789 | } |
d75b1ade | 6790 | |
d75b1ade ED |
6791 | local_irq_disable(); |
6792 | ||
6793 | list_splice_tail_init(&sd->poll_list, &list); | |
6794 | list_splice_tail(&repoll, &list); | |
6795 | list_splice(&list, &sd->poll_list); | |
6796 | if (!list_empty(&sd->poll_list)) | |
6797 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
c59647c0 ED |
6798 | else |
6799 | sd->in_net_rx_action = false; | |
d75b1ade | 6800 | |
e326bed2 | 6801 | net_rps_action_and_irq_enable(sd); |
90987650 | 6802 | end:; |
1da177e4 LT |
6803 | } |
6804 | ||
aa9d8560 | 6805 | struct netdev_adjacent { |
9ff162a8 | 6806 | struct net_device *dev; |
f77159a3 | 6807 | netdevice_tracker dev_tracker; |
5d261913 VF |
6808 | |
6809 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 6810 | bool master; |
5d261913 | 6811 | |
32b6d34f TY |
6812 | /* lookup ignore flag */ |
6813 | bool ignore; | |
6814 | ||
5d261913 VF |
6815 | /* counter for the number of times this device was added to us */ |
6816 | u16 ref_nr; | |
6817 | ||
402dae96 VF |
6818 | /* private field for the users */ |
6819 | void *private; | |
6820 | ||
9ff162a8 JP |
6821 | struct list_head list; |
6822 | struct rcu_head rcu; | |
9ff162a8 JP |
6823 | }; |
6824 | ||
6ea29da1 | 6825 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
2f268f12 | 6826 | struct list_head *adj_list) |
9ff162a8 | 6827 | { |
5d261913 | 6828 | struct netdev_adjacent *adj; |
5d261913 | 6829 | |
2f268f12 | 6830 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
6831 | if (adj->dev == adj_dev) |
6832 | return adj; | |
9ff162a8 JP |
6833 | } |
6834 | return NULL; | |
6835 | } | |
6836 | ||
eff74233 TY |
6837 | static int ____netdev_has_upper_dev(struct net_device *upper_dev, |
6838 | struct netdev_nested_priv *priv) | |
f1170fd4 | 6839 | { |
eff74233 | 6840 | struct net_device *dev = (struct net_device *)priv->data; |
f1170fd4 DA |
6841 | |
6842 | return upper_dev == dev; | |
6843 | } | |
6844 | ||
9ff162a8 JP |
6845 | /** |
6846 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
6847 | * @dev: device | |
6848 | * @upper_dev: upper device to check | |
6849 | * | |
6850 | * Find out if a device is linked to specified upper device and return true | |
6851 | * in case it is. Note that this checks only immediate upper device, | |
6852 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
6853 | */ | |
6854 | bool netdev_has_upper_dev(struct net_device *dev, | |
6855 | struct net_device *upper_dev) | |
6856 | { | |
eff74233 TY |
6857 | struct netdev_nested_priv priv = { |
6858 | .data = (void *)upper_dev, | |
6859 | }; | |
6860 | ||
9ff162a8 JP |
6861 | ASSERT_RTNL(); |
6862 | ||
32b6d34f | 6863 | return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
eff74233 | 6864 | &priv); |
9ff162a8 JP |
6865 | } |
6866 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
6867 | ||
1a3f060c | 6868 | /** |
c1639be9 | 6869 | * netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device |
1a3f060c DA |
6870 | * @dev: device |
6871 | * @upper_dev: upper device to check | |
6872 | * | |
6873 | * Find out if a device is linked to specified upper device and return true | |
6874 | * in case it is. Note that this checks the entire upper device chain. | |
6875 | * The caller must hold rcu lock. | |
6876 | */ | |
6877 | ||
1a3f060c DA |
6878 | bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
6879 | struct net_device *upper_dev) | |
6880 | { | |
eff74233 TY |
6881 | struct netdev_nested_priv priv = { |
6882 | .data = (void *)upper_dev, | |
6883 | }; | |
6884 | ||
32b6d34f | 6885 | return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
eff74233 | 6886 | &priv); |
1a3f060c DA |
6887 | } |
6888 | EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); | |
6889 | ||
9ff162a8 JP |
6890 | /** |
6891 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
6892 | * @dev: device | |
6893 | * | |
6894 | * Find out if a device is linked to an upper device and return true in case | |
6895 | * it is. The caller must hold the RTNL lock. | |
6896 | */ | |
25cc72a3 | 6897 | bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
6898 | { |
6899 | ASSERT_RTNL(); | |
6900 | ||
f1170fd4 | 6901 | return !list_empty(&dev->adj_list.upper); |
9ff162a8 | 6902 | } |
25cc72a3 | 6903 | EXPORT_SYMBOL(netdev_has_any_upper_dev); |
9ff162a8 JP |
6904 | |
6905 | /** | |
6906 | * netdev_master_upper_dev_get - Get master upper device | |
6907 | * @dev: device | |
6908 | * | |
6909 | * Find a master upper device and return pointer to it or NULL in case | |
6910 | * it's not there. The caller must hold the RTNL lock. | |
6911 | */ | |
6912 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
6913 | { | |
aa9d8560 | 6914 | struct netdev_adjacent *upper; |
9ff162a8 JP |
6915 | |
6916 | ASSERT_RTNL(); | |
6917 | ||
2f268f12 | 6918 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
6919 | return NULL; |
6920 | ||
2f268f12 | 6921 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 6922 | struct netdev_adjacent, list); |
9ff162a8 JP |
6923 | if (likely(upper->master)) |
6924 | return upper->dev; | |
6925 | return NULL; | |
6926 | } | |
6927 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
6928 | ||
32b6d34f TY |
6929 | static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev) |
6930 | { | |
6931 | struct netdev_adjacent *upper; | |
6932 | ||
6933 | ASSERT_RTNL(); | |
6934 | ||
6935 | if (list_empty(&dev->adj_list.upper)) | |
6936 | return NULL; | |
6937 | ||
6938 | upper = list_first_entry(&dev->adj_list.upper, | |
6939 | struct netdev_adjacent, list); | |
6940 | if (likely(upper->master) && !upper->ignore) | |
6941 | return upper->dev; | |
6942 | return NULL; | |
6943 | } | |
6944 | ||
0f524a80 DA |
6945 | /** |
6946 | * netdev_has_any_lower_dev - Check if device is linked to some device | |
6947 | * @dev: device | |
6948 | * | |
6949 | * Find out if a device is linked to a lower device and return true in case | |
6950 | * it is. The caller must hold the RTNL lock. | |
6951 | */ | |
6952 | static bool netdev_has_any_lower_dev(struct net_device *dev) | |
6953 | { | |
6954 | ASSERT_RTNL(); | |
6955 | ||
6956 | return !list_empty(&dev->adj_list.lower); | |
6957 | } | |
6958 | ||
b6ccba4c VF |
6959 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
6960 | { | |
6961 | struct netdev_adjacent *adj; | |
6962 | ||
6963 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
6964 | ||
6965 | return adj->private; | |
6966 | } | |
6967 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
6968 | ||
44a40855 VY |
6969 | /** |
6970 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
6971 | * @dev: device | |
6972 | * @iter: list_head ** of the current position | |
6973 | * | |
6974 | * Gets the next device from the dev's upper list, starting from iter | |
6975 | * position. The caller must hold RCU read lock. | |
6976 | */ | |
6977 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
6978 | struct list_head **iter) | |
6979 | { | |
6980 | struct netdev_adjacent *upper; | |
6981 | ||
6982 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
6983 | ||
6984 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6985 | ||
6986 | if (&upper->list == &dev->adj_list.upper) | |
6987 | return NULL; | |
6988 | ||
6989 | *iter = &upper->list; | |
6990 | ||
6991 | return upper->dev; | |
6992 | } | |
6993 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
6994 | ||
32b6d34f TY |
6995 | static struct net_device *__netdev_next_upper_dev(struct net_device *dev, |
6996 | struct list_head **iter, | |
6997 | bool *ignore) | |
5343da4c TY |
6998 | { |
6999 | struct netdev_adjacent *upper; | |
7000 | ||
7001 | upper = list_entry((*iter)->next, struct netdev_adjacent, list); | |
7002 | ||
7003 | if (&upper->list == &dev->adj_list.upper) | |
7004 | return NULL; | |
7005 | ||
7006 | *iter = &upper->list; | |
32b6d34f | 7007 | *ignore = upper->ignore; |
5343da4c TY |
7008 | |
7009 | return upper->dev; | |
7010 | } | |
7011 | ||
1a3f060c DA |
7012 | static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
7013 | struct list_head **iter) | |
7014 | { | |
7015 | struct netdev_adjacent *upper; | |
7016 | ||
7017 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
7018 | ||
7019 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7020 | ||
7021 | if (&upper->list == &dev->adj_list.upper) | |
7022 | return NULL; | |
7023 | ||
7024 | *iter = &upper->list; | |
7025 | ||
7026 | return upper->dev; | |
7027 | } | |
7028 | ||
32b6d34f TY |
7029 | static int __netdev_walk_all_upper_dev(struct net_device *dev, |
7030 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7031 | struct netdev_nested_priv *priv), |
7032 | struct netdev_nested_priv *priv) | |
5343da4c TY |
7033 | { |
7034 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7035 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7036 | int ret, cur = 0; | |
32b6d34f | 7037 | bool ignore; |
5343da4c TY |
7038 | |
7039 | now = dev; | |
7040 | iter = &dev->adj_list.upper; | |
7041 | ||
7042 | while (1) { | |
7043 | if (now != dev) { | |
eff74233 | 7044 | ret = fn(now, priv); |
5343da4c TY |
7045 | if (ret) |
7046 | return ret; | |
7047 | } | |
7048 | ||
7049 | next = NULL; | |
7050 | while (1) { | |
32b6d34f | 7051 | udev = __netdev_next_upper_dev(now, &iter, &ignore); |
5343da4c TY |
7052 | if (!udev) |
7053 | break; | |
32b6d34f TY |
7054 | if (ignore) |
7055 | continue; | |
5343da4c TY |
7056 | |
7057 | next = udev; | |
7058 | niter = &udev->adj_list.upper; | |
7059 | dev_stack[cur] = now; | |
7060 | iter_stack[cur++] = iter; | |
7061 | break; | |
7062 | } | |
7063 | ||
7064 | if (!next) { | |
7065 | if (!cur) | |
7066 | return 0; | |
7067 | next = dev_stack[--cur]; | |
7068 | niter = iter_stack[cur]; | |
7069 | } | |
7070 | ||
7071 | now = next; | |
7072 | iter = niter; | |
7073 | } | |
7074 | ||
7075 | return 0; | |
7076 | } | |
7077 | ||
1a3f060c DA |
7078 | int netdev_walk_all_upper_dev_rcu(struct net_device *dev, |
7079 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7080 | struct netdev_nested_priv *priv), |
7081 | struct netdev_nested_priv *priv) | |
1a3f060c | 7082 | { |
5343da4c TY |
7083 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
7084 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7085 | int ret, cur = 0; | |
1a3f060c | 7086 | |
5343da4c TY |
7087 | now = dev; |
7088 | iter = &dev->adj_list.upper; | |
1a3f060c | 7089 | |
5343da4c TY |
7090 | while (1) { |
7091 | if (now != dev) { | |
eff74233 | 7092 | ret = fn(now, priv); |
5343da4c TY |
7093 | if (ret) |
7094 | return ret; | |
7095 | } | |
7096 | ||
7097 | next = NULL; | |
7098 | while (1) { | |
7099 | udev = netdev_next_upper_dev_rcu(now, &iter); | |
7100 | if (!udev) | |
7101 | break; | |
7102 | ||
7103 | next = udev; | |
7104 | niter = &udev->adj_list.upper; | |
7105 | dev_stack[cur] = now; | |
7106 | iter_stack[cur++] = iter; | |
7107 | break; | |
7108 | } | |
7109 | ||
7110 | if (!next) { | |
7111 | if (!cur) | |
7112 | return 0; | |
7113 | next = dev_stack[--cur]; | |
7114 | niter = iter_stack[cur]; | |
7115 | } | |
7116 | ||
7117 | now = next; | |
7118 | iter = niter; | |
1a3f060c DA |
7119 | } |
7120 | ||
7121 | return 0; | |
7122 | } | |
7123 | EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); | |
7124 | ||
32b6d34f TY |
7125 | static bool __netdev_has_upper_dev(struct net_device *dev, |
7126 | struct net_device *upper_dev) | |
7127 | { | |
eff74233 | 7128 | struct netdev_nested_priv priv = { |
1fc70edb | 7129 | .flags = 0, |
eff74233 TY |
7130 | .data = (void *)upper_dev, |
7131 | }; | |
7132 | ||
32b6d34f TY |
7133 | ASSERT_RTNL(); |
7134 | ||
7135 | return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev, | |
eff74233 | 7136 | &priv); |
32b6d34f TY |
7137 | } |
7138 | ||
31088a11 VF |
7139 | /** |
7140 | * netdev_lower_get_next_private - Get the next ->private from the | |
7141 | * lower neighbour list | |
7142 | * @dev: device | |
7143 | * @iter: list_head ** of the current position | |
7144 | * | |
7145 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
7146 | * list, starting from iter position. The caller must hold either hold the | |
7147 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
b469139e | 7148 | * list will remain unchanged. |
31088a11 VF |
7149 | */ |
7150 | void *netdev_lower_get_next_private(struct net_device *dev, | |
7151 | struct list_head **iter) | |
7152 | { | |
7153 | struct netdev_adjacent *lower; | |
7154 | ||
7155 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
7156 | ||
7157 | if (&lower->list == &dev->adj_list.lower) | |
7158 | return NULL; | |
7159 | ||
6859e7df | 7160 | *iter = lower->list.next; |
31088a11 VF |
7161 | |
7162 | return lower->private; | |
7163 | } | |
7164 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
7165 | ||
7166 | /** | |
7167 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
7168 | * lower neighbour list, RCU | |
7169 | * variant | |
7170 | * @dev: device | |
7171 | * @iter: list_head ** of the current position | |
7172 | * | |
7173 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
7174 | * list, starting from iter position. The caller must hold RCU read lock. | |
7175 | */ | |
7176 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
7177 | struct list_head **iter) | |
7178 | { | |
7179 | struct netdev_adjacent *lower; | |
7180 | ||
68918669 | 7181 | WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held()); |
31088a11 VF |
7182 | |
7183 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7184 | ||
7185 | if (&lower->list == &dev->adj_list.lower) | |
7186 | return NULL; | |
7187 | ||
6859e7df | 7188 | *iter = &lower->list; |
31088a11 VF |
7189 | |
7190 | return lower->private; | |
7191 | } | |
7192 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
7193 | ||
4085ebe8 VY |
7194 | /** |
7195 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
7196 | * list | |
7197 | * @dev: device | |
7198 | * @iter: list_head ** of the current position | |
7199 | * | |
7200 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
7201 | * list, starting from iter position. The caller must hold RTNL lock or | |
7202 | * its own locking that guarantees that the neighbour lower | |
b469139e | 7203 | * list will remain unchanged. |
4085ebe8 VY |
7204 | */ |
7205 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
7206 | { | |
7207 | struct netdev_adjacent *lower; | |
7208 | ||
cfdd28be | 7209 | lower = list_entry(*iter, struct netdev_adjacent, list); |
4085ebe8 VY |
7210 | |
7211 | if (&lower->list == &dev->adj_list.lower) | |
7212 | return NULL; | |
7213 | ||
cfdd28be | 7214 | *iter = lower->list.next; |
4085ebe8 VY |
7215 | |
7216 | return lower->dev; | |
7217 | } | |
7218 | EXPORT_SYMBOL(netdev_lower_get_next); | |
7219 | ||
1a3f060c DA |
7220 | static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
7221 | struct list_head **iter) | |
7222 | { | |
7223 | struct netdev_adjacent *lower; | |
7224 | ||
46b5ab1a | 7225 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
1a3f060c DA |
7226 | |
7227 | if (&lower->list == &dev->adj_list.lower) | |
7228 | return NULL; | |
7229 | ||
46b5ab1a | 7230 | *iter = &lower->list; |
1a3f060c DA |
7231 | |
7232 | return lower->dev; | |
7233 | } | |
7234 | ||
32b6d34f TY |
7235 | static struct net_device *__netdev_next_lower_dev(struct net_device *dev, |
7236 | struct list_head **iter, | |
7237 | bool *ignore) | |
7238 | { | |
7239 | struct netdev_adjacent *lower; | |
7240 | ||
7241 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
7242 | ||
7243 | if (&lower->list == &dev->adj_list.lower) | |
7244 | return NULL; | |
7245 | ||
7246 | *iter = &lower->list; | |
7247 | *ignore = lower->ignore; | |
7248 | ||
7249 | return lower->dev; | |
7250 | } | |
7251 | ||
1a3f060c DA |
7252 | int netdev_walk_all_lower_dev(struct net_device *dev, |
7253 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7254 | struct netdev_nested_priv *priv), |
7255 | struct netdev_nested_priv *priv) | |
1a3f060c | 7256 | { |
5343da4c TY |
7257 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
7258 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7259 | int ret, cur = 0; | |
1a3f060c | 7260 | |
5343da4c TY |
7261 | now = dev; |
7262 | iter = &dev->adj_list.lower; | |
1a3f060c | 7263 | |
5343da4c TY |
7264 | while (1) { |
7265 | if (now != dev) { | |
eff74233 | 7266 | ret = fn(now, priv); |
5343da4c TY |
7267 | if (ret) |
7268 | return ret; | |
7269 | } | |
7270 | ||
7271 | next = NULL; | |
7272 | while (1) { | |
7273 | ldev = netdev_next_lower_dev(now, &iter); | |
7274 | if (!ldev) | |
7275 | break; | |
7276 | ||
7277 | next = ldev; | |
7278 | niter = &ldev->adj_list.lower; | |
7279 | dev_stack[cur] = now; | |
7280 | iter_stack[cur++] = iter; | |
7281 | break; | |
7282 | } | |
7283 | ||
7284 | if (!next) { | |
7285 | if (!cur) | |
7286 | return 0; | |
7287 | next = dev_stack[--cur]; | |
7288 | niter = iter_stack[cur]; | |
7289 | } | |
7290 | ||
7291 | now = next; | |
7292 | iter = niter; | |
1a3f060c DA |
7293 | } |
7294 | ||
7295 | return 0; | |
7296 | } | |
7297 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); | |
7298 | ||
32b6d34f TY |
7299 | static int __netdev_walk_all_lower_dev(struct net_device *dev, |
7300 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7301 | struct netdev_nested_priv *priv), |
7302 | struct netdev_nested_priv *priv) | |
32b6d34f TY |
7303 | { |
7304 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7305 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7306 | int ret, cur = 0; | |
7307 | bool ignore; | |
7308 | ||
7309 | now = dev; | |
7310 | iter = &dev->adj_list.lower; | |
7311 | ||
7312 | while (1) { | |
7313 | if (now != dev) { | |
eff74233 | 7314 | ret = fn(now, priv); |
32b6d34f TY |
7315 | if (ret) |
7316 | return ret; | |
7317 | } | |
7318 | ||
7319 | next = NULL; | |
7320 | while (1) { | |
7321 | ldev = __netdev_next_lower_dev(now, &iter, &ignore); | |
7322 | if (!ldev) | |
7323 | break; | |
7324 | if (ignore) | |
7325 | continue; | |
7326 | ||
7327 | next = ldev; | |
7328 | niter = &ldev->adj_list.lower; | |
7329 | dev_stack[cur] = now; | |
7330 | iter_stack[cur++] = iter; | |
7331 | break; | |
7332 | } | |
7333 | ||
7334 | if (!next) { | |
7335 | if (!cur) | |
7336 | return 0; | |
7337 | next = dev_stack[--cur]; | |
7338 | niter = iter_stack[cur]; | |
7339 | } | |
7340 | ||
7341 | now = next; | |
7342 | iter = niter; | |
7343 | } | |
7344 | ||
7345 | return 0; | |
7346 | } | |
7347 | ||
7151affe TY |
7348 | struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
7349 | struct list_head **iter) | |
1a3f060c DA |
7350 | { |
7351 | struct netdev_adjacent *lower; | |
7352 | ||
7353 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7354 | if (&lower->list == &dev->adj_list.lower) | |
7355 | return NULL; | |
7356 | ||
7357 | *iter = &lower->list; | |
7358 | ||
7359 | return lower->dev; | |
7360 | } | |
7151affe | 7361 | EXPORT_SYMBOL(netdev_next_lower_dev_rcu); |
1a3f060c | 7362 | |
5343da4c TY |
7363 | static u8 __netdev_upper_depth(struct net_device *dev) |
7364 | { | |
7365 | struct net_device *udev; | |
7366 | struct list_head *iter; | |
7367 | u8 max_depth = 0; | |
32b6d34f | 7368 | bool ignore; |
5343da4c TY |
7369 | |
7370 | for (iter = &dev->adj_list.upper, | |
32b6d34f | 7371 | udev = __netdev_next_upper_dev(dev, &iter, &ignore); |
5343da4c | 7372 | udev; |
32b6d34f TY |
7373 | udev = __netdev_next_upper_dev(dev, &iter, &ignore)) { |
7374 | if (ignore) | |
7375 | continue; | |
5343da4c TY |
7376 | if (max_depth < udev->upper_level) |
7377 | max_depth = udev->upper_level; | |
7378 | } | |
7379 | ||
7380 | return max_depth; | |
7381 | } | |
7382 | ||
7383 | static u8 __netdev_lower_depth(struct net_device *dev) | |
1a3f060c DA |
7384 | { |
7385 | struct net_device *ldev; | |
7386 | struct list_head *iter; | |
5343da4c | 7387 | u8 max_depth = 0; |
32b6d34f | 7388 | bool ignore; |
1a3f060c DA |
7389 | |
7390 | for (iter = &dev->adj_list.lower, | |
32b6d34f | 7391 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore); |
1a3f060c | 7392 | ldev; |
32b6d34f TY |
7393 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) { |
7394 | if (ignore) | |
7395 | continue; | |
5343da4c TY |
7396 | if (max_depth < ldev->lower_level) |
7397 | max_depth = ldev->lower_level; | |
7398 | } | |
1a3f060c | 7399 | |
5343da4c TY |
7400 | return max_depth; |
7401 | } | |
7402 | ||
eff74233 TY |
7403 | static int __netdev_update_upper_level(struct net_device *dev, |
7404 | struct netdev_nested_priv *__unused) | |
5343da4c TY |
7405 | { |
7406 | dev->upper_level = __netdev_upper_depth(dev) + 1; | |
7407 | return 0; | |
7408 | } | |
7409 | ||
f32404ae JB |
7410 | #ifdef CONFIG_LOCKDEP |
7411 | static LIST_HEAD(net_unlink_list); | |
7412 | ||
7413 | static void net_unlink_todo(struct net_device *dev) | |
7414 | { | |
7415 | if (list_empty(&dev->unlink_list)) | |
7416 | list_add_tail(&dev->unlink_list, &net_unlink_list); | |
7417 | } | |
7418 | #endif | |
7419 | ||
eff74233 | 7420 | static int __netdev_update_lower_level(struct net_device *dev, |
1fc70edb | 7421 | struct netdev_nested_priv *priv) |
5343da4c TY |
7422 | { |
7423 | dev->lower_level = __netdev_lower_depth(dev) + 1; | |
1fc70edb TY |
7424 | |
7425 | #ifdef CONFIG_LOCKDEP | |
7426 | if (!priv) | |
7427 | return 0; | |
7428 | ||
7429 | if (priv->flags & NESTED_SYNC_IMM) | |
7430 | dev->nested_level = dev->lower_level - 1; | |
7431 | if (priv->flags & NESTED_SYNC_TODO) | |
7432 | net_unlink_todo(dev); | |
7433 | #endif | |
5343da4c TY |
7434 | return 0; |
7435 | } | |
7436 | ||
7437 | int netdev_walk_all_lower_dev_rcu(struct net_device *dev, | |
7438 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7439 | struct netdev_nested_priv *priv), |
7440 | struct netdev_nested_priv *priv) | |
5343da4c TY |
7441 | { |
7442 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7443 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7444 | int ret, cur = 0; | |
7445 | ||
7446 | now = dev; | |
7447 | iter = &dev->adj_list.lower; | |
7448 | ||
7449 | while (1) { | |
7450 | if (now != dev) { | |
eff74233 | 7451 | ret = fn(now, priv); |
5343da4c TY |
7452 | if (ret) |
7453 | return ret; | |
7454 | } | |
7455 | ||
7456 | next = NULL; | |
7457 | while (1) { | |
7458 | ldev = netdev_next_lower_dev_rcu(now, &iter); | |
7459 | if (!ldev) | |
7460 | break; | |
7461 | ||
7462 | next = ldev; | |
7463 | niter = &ldev->adj_list.lower; | |
7464 | dev_stack[cur] = now; | |
7465 | iter_stack[cur++] = iter; | |
7466 | break; | |
7467 | } | |
7468 | ||
7469 | if (!next) { | |
7470 | if (!cur) | |
7471 | return 0; | |
7472 | next = dev_stack[--cur]; | |
7473 | niter = iter_stack[cur]; | |
7474 | } | |
7475 | ||
7476 | now = next; | |
7477 | iter = niter; | |
1a3f060c DA |
7478 | } |
7479 | ||
7480 | return 0; | |
7481 | } | |
7482 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); | |
7483 | ||
e001bfad | 7484 | /** |
7485 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
7486 | * lower neighbour list, RCU | |
7487 | * variant | |
7488 | * @dev: device | |
7489 | * | |
7490 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
7491 | * list. The caller must hold RCU read lock. | |
7492 | */ | |
7493 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
7494 | { | |
7495 | struct netdev_adjacent *lower; | |
7496 | ||
7497 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
7498 | struct netdev_adjacent, list); | |
7499 | if (lower) | |
7500 | return lower->private; | |
7501 | return NULL; | |
7502 | } | |
7503 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
7504 | ||
9ff162a8 JP |
7505 | /** |
7506 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
7507 | * @dev: device | |
7508 | * | |
7509 | * Find a master upper device and return pointer to it or NULL in case | |
7510 | * it's not there. The caller must hold the RCU read lock. | |
7511 | */ | |
7512 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
7513 | { | |
aa9d8560 | 7514 | struct netdev_adjacent *upper; |
9ff162a8 | 7515 | |
2f268f12 | 7516 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 7517 | struct netdev_adjacent, list); |
9ff162a8 JP |
7518 | if (upper && likely(upper->master)) |
7519 | return upper->dev; | |
7520 | return NULL; | |
7521 | } | |
7522 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
7523 | ||
0a59f3a9 | 7524 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
7525 | struct net_device *adj_dev, |
7526 | struct list_head *dev_list) | |
7527 | { | |
7528 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7529 | |
3ee32707 VF |
7530 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7531 | "upper_%s" : "lower_%s", adj_dev->name); | |
7532 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
7533 | linkname); | |
7534 | } | |
0a59f3a9 | 7535 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
7536 | char *name, |
7537 | struct list_head *dev_list) | |
7538 | { | |
7539 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7540 | |
3ee32707 VF |
7541 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7542 | "upper_%s" : "lower_%s", name); | |
7543 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
7544 | } | |
7545 | ||
7ce64c79 AF |
7546 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
7547 | struct net_device *adj_dev, | |
7548 | struct list_head *dev_list) | |
7549 | { | |
7550 | return (dev_list == &dev->adj_list.upper || | |
7551 | dev_list == &dev->adj_list.lower) && | |
7552 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
7553 | } | |
3ee32707 | 7554 | |
5d261913 VF |
7555 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
7556 | struct net_device *adj_dev, | |
7863c054 | 7557 | struct list_head *dev_list, |
402dae96 | 7558 | void *private, bool master) |
5d261913 VF |
7559 | { |
7560 | struct netdev_adjacent *adj; | |
842d67a7 | 7561 | int ret; |
5d261913 | 7562 | |
6ea29da1 | 7563 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 VF |
7564 | |
7565 | if (adj) { | |
790510d9 | 7566 | adj->ref_nr += 1; |
67b62f98 DA |
7567 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
7568 | dev->name, adj_dev->name, adj->ref_nr); | |
7569 | ||
5d261913 VF |
7570 | return 0; |
7571 | } | |
7572 | ||
7573 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
7574 | if (!adj) | |
7575 | return -ENOMEM; | |
7576 | ||
7577 | adj->dev = adj_dev; | |
7578 | adj->master = master; | |
790510d9 | 7579 | adj->ref_nr = 1; |
402dae96 | 7580 | adj->private = private; |
32b6d34f | 7581 | adj->ignore = false; |
d62607c3 | 7582 | netdev_hold(adj_dev, &adj->dev_tracker, GFP_KERNEL); |
2f268f12 | 7583 | |
67b62f98 DA |
7584 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
7585 | dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); | |
5d261913 | 7586 | |
7ce64c79 | 7587 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 7588 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
7589 | if (ret) |
7590 | goto free_adj; | |
7591 | } | |
7592 | ||
7863c054 | 7593 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
7594 | if (master) { |
7595 | ret = sysfs_create_link(&(dev->dev.kobj), | |
7596 | &(adj_dev->dev.kobj), "master"); | |
7597 | if (ret) | |
5831d66e | 7598 | goto remove_symlinks; |
842d67a7 | 7599 | |
7863c054 | 7600 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 7601 | } else { |
7863c054 | 7602 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 7603 | } |
5d261913 VF |
7604 | |
7605 | return 0; | |
842d67a7 | 7606 | |
5831d66e | 7607 | remove_symlinks: |
7ce64c79 | 7608 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 7609 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 | 7610 | free_adj: |
d62607c3 | 7611 | netdev_put(adj_dev, &adj->dev_tracker); |
842d67a7 VF |
7612 | kfree(adj); |
7613 | ||
7614 | return ret; | |
5d261913 VF |
7615 | } |
7616 | ||
1d143d9f | 7617 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
7618 | struct net_device *adj_dev, | |
93409033 | 7619 | u16 ref_nr, |
1d143d9f | 7620 | struct list_head *dev_list) |
5d261913 VF |
7621 | { |
7622 | struct netdev_adjacent *adj; | |
7623 | ||
67b62f98 DA |
7624 | pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
7625 | dev->name, adj_dev->name, ref_nr); | |
7626 | ||
6ea29da1 | 7627 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 | 7628 | |
2f268f12 | 7629 | if (!adj) { |
67b62f98 | 7630 | pr_err("Adjacency does not exist for device %s from %s\n", |
2f268f12 | 7631 | dev->name, adj_dev->name); |
67b62f98 DA |
7632 | WARN_ON(1); |
7633 | return; | |
2f268f12 | 7634 | } |
5d261913 | 7635 | |
93409033 | 7636 | if (adj->ref_nr > ref_nr) { |
67b62f98 DA |
7637 | pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
7638 | dev->name, adj_dev->name, ref_nr, | |
7639 | adj->ref_nr - ref_nr); | |
93409033 | 7640 | adj->ref_nr -= ref_nr; |
5d261913 VF |
7641 | return; |
7642 | } | |
7643 | ||
842d67a7 VF |
7644 | if (adj->master) |
7645 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
7646 | ||
7ce64c79 | 7647 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 7648 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 7649 | |
5d261913 | 7650 | list_del_rcu(&adj->list); |
67b62f98 | 7651 | pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
2f268f12 | 7652 | adj_dev->name, dev->name, adj_dev->name); |
d62607c3 | 7653 | netdev_put(adj_dev, &adj->dev_tracker); |
5d261913 VF |
7654 | kfree_rcu(adj, rcu); |
7655 | } | |
7656 | ||
1d143d9f | 7657 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
7658 | struct net_device *upper_dev, | |
7659 | struct list_head *up_list, | |
7660 | struct list_head *down_list, | |
7661 | void *private, bool master) | |
5d261913 VF |
7662 | { |
7663 | int ret; | |
7664 | ||
790510d9 | 7665 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
93409033 | 7666 | private, master); |
5d261913 VF |
7667 | if (ret) |
7668 | return ret; | |
7669 | ||
790510d9 | 7670 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
93409033 | 7671 | private, false); |
5d261913 | 7672 | if (ret) { |
790510d9 | 7673 | __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
5d261913 VF |
7674 | return ret; |
7675 | } | |
7676 | ||
7677 | return 0; | |
7678 | } | |
7679 | ||
1d143d9f | 7680 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
7681 | struct net_device *upper_dev, | |
93409033 | 7682 | u16 ref_nr, |
1d143d9f | 7683 | struct list_head *up_list, |
7684 | struct list_head *down_list) | |
5d261913 | 7685 | { |
93409033 AC |
7686 | __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
7687 | __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); | |
5d261913 VF |
7688 | } |
7689 | ||
1d143d9f | 7690 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
7691 | struct net_device *upper_dev, | |
7692 | void *private, bool master) | |
2f268f12 | 7693 | { |
f1170fd4 DA |
7694 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
7695 | &dev->adj_list.upper, | |
7696 | &upper_dev->adj_list.lower, | |
7697 | private, master); | |
5d261913 VF |
7698 | } |
7699 | ||
1d143d9f | 7700 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
7701 | struct net_device *upper_dev) | |
2f268f12 | 7702 | { |
93409033 | 7703 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
2f268f12 VF |
7704 | &dev->adj_list.upper, |
7705 | &upper_dev->adj_list.lower); | |
7706 | } | |
5d261913 | 7707 | |
9ff162a8 | 7708 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 | 7709 | struct net_device *upper_dev, bool master, |
42ab19ee | 7710 | void *upper_priv, void *upper_info, |
1fc70edb | 7711 | struct netdev_nested_priv *priv, |
42ab19ee | 7712 | struct netlink_ext_ack *extack) |
9ff162a8 | 7713 | { |
51d0c047 DA |
7714 | struct netdev_notifier_changeupper_info changeupper_info = { |
7715 | .info = { | |
7716 | .dev = dev, | |
42ab19ee | 7717 | .extack = extack, |
51d0c047 DA |
7718 | }, |
7719 | .upper_dev = upper_dev, | |
7720 | .master = master, | |
7721 | .linking = true, | |
7722 | .upper_info = upper_info, | |
7723 | }; | |
50d629e7 | 7724 | struct net_device *master_dev; |
5d261913 | 7725 | int ret = 0; |
9ff162a8 JP |
7726 | |
7727 | ASSERT_RTNL(); | |
7728 | ||
7729 | if (dev == upper_dev) | |
7730 | return -EBUSY; | |
7731 | ||
7732 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
32b6d34f | 7733 | if (__netdev_has_upper_dev(upper_dev, dev)) |
9ff162a8 JP |
7734 | return -EBUSY; |
7735 | ||
5343da4c TY |
7736 | if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV) |
7737 | return -EMLINK; | |
7738 | ||
50d629e7 | 7739 | if (!master) { |
32b6d34f | 7740 | if (__netdev_has_upper_dev(dev, upper_dev)) |
50d629e7 MM |
7741 | return -EEXIST; |
7742 | } else { | |
32b6d34f | 7743 | master_dev = __netdev_master_upper_dev_get(dev); |
50d629e7 MM |
7744 | if (master_dev) |
7745 | return master_dev == upper_dev ? -EEXIST : -EBUSY; | |
7746 | } | |
9ff162a8 | 7747 | |
51d0c047 | 7748 | ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
7749 | &changeupper_info.info); |
7750 | ret = notifier_to_errno(ret); | |
7751 | if (ret) | |
7752 | return ret; | |
7753 | ||
6dffb044 | 7754 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
402dae96 | 7755 | master); |
5d261913 VF |
7756 | if (ret) |
7757 | return ret; | |
9ff162a8 | 7758 | |
51d0c047 | 7759 | ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
b03804e7 IS |
7760 | &changeupper_info.info); |
7761 | ret = notifier_to_errno(ret); | |
7762 | if (ret) | |
f1170fd4 | 7763 | goto rollback; |
b03804e7 | 7764 | |
5343da4c | 7765 | __netdev_update_upper_level(dev, NULL); |
32b6d34f | 7766 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c | 7767 | |
1fc70edb | 7768 | __netdev_update_lower_level(upper_dev, priv); |
32b6d34f | 7769 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
1fc70edb | 7770 | priv); |
5343da4c | 7771 | |
9ff162a8 | 7772 | return 0; |
5d261913 | 7773 | |
f1170fd4 | 7774 | rollback: |
2f268f12 | 7775 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
7776 | |
7777 | return ret; | |
9ff162a8 JP |
7778 | } |
7779 | ||
7780 | /** | |
7781 | * netdev_upper_dev_link - Add a link to the upper device | |
7782 | * @dev: device | |
7783 | * @upper_dev: new upper device | |
7a006d59 | 7784 | * @extack: netlink extended ack |
9ff162a8 JP |
7785 | * |
7786 | * Adds a link to device which is upper to this one. The caller must hold | |
7787 | * the RTNL lock. On a failure a negative errno code is returned. | |
7788 | * On success the reference counts are adjusted and the function | |
7789 | * returns zero. | |
7790 | */ | |
7791 | int netdev_upper_dev_link(struct net_device *dev, | |
42ab19ee DA |
7792 | struct net_device *upper_dev, |
7793 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7794 | { |
1fc70edb TY |
7795 | struct netdev_nested_priv priv = { |
7796 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
7797 | .data = NULL, | |
7798 | }; | |
7799 | ||
42ab19ee | 7800 | return __netdev_upper_dev_link(dev, upper_dev, false, |
1fc70edb | 7801 | NULL, NULL, &priv, extack); |
9ff162a8 JP |
7802 | } |
7803 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
7804 | ||
7805 | /** | |
7806 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
7807 | * @dev: device | |
7808 | * @upper_dev: new upper device | |
6dffb044 | 7809 | * @upper_priv: upper device private |
29bf24af | 7810 | * @upper_info: upper info to be passed down via notifier |
7a006d59 | 7811 | * @extack: netlink extended ack |
9ff162a8 JP |
7812 | * |
7813 | * Adds a link to device which is upper to this one. In this case, only | |
7814 | * one master upper device can be linked, although other non-master devices | |
7815 | * might be linked as well. The caller must hold the RTNL lock. | |
7816 | * On a failure a negative errno code is returned. On success the reference | |
7817 | * counts are adjusted and the function returns zero. | |
7818 | */ | |
7819 | int netdev_master_upper_dev_link(struct net_device *dev, | |
6dffb044 | 7820 | struct net_device *upper_dev, |
42ab19ee DA |
7821 | void *upper_priv, void *upper_info, |
7822 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7823 | { |
1fc70edb TY |
7824 | struct netdev_nested_priv priv = { |
7825 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
7826 | .data = NULL, | |
7827 | }; | |
7828 | ||
29bf24af | 7829 | return __netdev_upper_dev_link(dev, upper_dev, true, |
1fc70edb | 7830 | upper_priv, upper_info, &priv, extack); |
9ff162a8 JP |
7831 | } |
7832 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
7833 | ||
fe8300fd | 7834 | static void __netdev_upper_dev_unlink(struct net_device *dev, |
1fc70edb TY |
7835 | struct net_device *upper_dev, |
7836 | struct netdev_nested_priv *priv) | |
9ff162a8 | 7837 | { |
51d0c047 DA |
7838 | struct netdev_notifier_changeupper_info changeupper_info = { |
7839 | .info = { | |
7840 | .dev = dev, | |
7841 | }, | |
7842 | .upper_dev = upper_dev, | |
7843 | .linking = false, | |
7844 | }; | |
f4563a75 | 7845 | |
9ff162a8 JP |
7846 | ASSERT_RTNL(); |
7847 | ||
0e4ead9d | 7848 | changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; |
0e4ead9d | 7849 | |
51d0c047 | 7850 | call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
7851 | &changeupper_info.info); |
7852 | ||
2f268f12 | 7853 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 | 7854 | |
51d0c047 | 7855 | call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
0e4ead9d | 7856 | &changeupper_info.info); |
5343da4c TY |
7857 | |
7858 | __netdev_update_upper_level(dev, NULL); | |
32b6d34f | 7859 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c | 7860 | |
1fc70edb | 7861 | __netdev_update_lower_level(upper_dev, priv); |
32b6d34f | 7862 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
1fc70edb | 7863 | priv); |
9ff162a8 | 7864 | } |
fe8300fd TY |
7865 | |
7866 | /** | |
7867 | * netdev_upper_dev_unlink - Removes a link to upper device | |
7868 | * @dev: device | |
7869 | * @upper_dev: new upper device | |
7870 | * | |
7871 | * Removes a link to device which is upper to this one. The caller must hold | |
7872 | * the RTNL lock. | |
7873 | */ | |
7874 | void netdev_upper_dev_unlink(struct net_device *dev, | |
7875 | struct net_device *upper_dev) | |
7876 | { | |
1fc70edb TY |
7877 | struct netdev_nested_priv priv = { |
7878 | .flags = NESTED_SYNC_TODO, | |
7879 | .data = NULL, | |
7880 | }; | |
7881 | ||
7882 | __netdev_upper_dev_unlink(dev, upper_dev, &priv); | |
9ff162a8 JP |
7883 | } |
7884 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
7885 | ||
32b6d34f TY |
7886 | static void __netdev_adjacent_dev_set(struct net_device *upper_dev, |
7887 | struct net_device *lower_dev, | |
7888 | bool val) | |
7889 | { | |
7890 | struct netdev_adjacent *adj; | |
7891 | ||
7892 | adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower); | |
7893 | if (adj) | |
7894 | adj->ignore = val; | |
7895 | ||
7896 | adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper); | |
7897 | if (adj) | |
7898 | adj->ignore = val; | |
7899 | } | |
7900 | ||
7901 | static void netdev_adjacent_dev_disable(struct net_device *upper_dev, | |
7902 | struct net_device *lower_dev) | |
7903 | { | |
7904 | __netdev_adjacent_dev_set(upper_dev, lower_dev, true); | |
7905 | } | |
7906 | ||
7907 | static void netdev_adjacent_dev_enable(struct net_device *upper_dev, | |
7908 | struct net_device *lower_dev) | |
7909 | { | |
7910 | __netdev_adjacent_dev_set(upper_dev, lower_dev, false); | |
7911 | } | |
7912 | ||
7913 | int netdev_adjacent_change_prepare(struct net_device *old_dev, | |
7914 | struct net_device *new_dev, | |
7915 | struct net_device *dev, | |
7916 | struct netlink_ext_ack *extack) | |
7917 | { | |
1fc70edb TY |
7918 | struct netdev_nested_priv priv = { |
7919 | .flags = 0, | |
7920 | .data = NULL, | |
7921 | }; | |
32b6d34f TY |
7922 | int err; |
7923 | ||
7924 | if (!new_dev) | |
7925 | return 0; | |
7926 | ||
7927 | if (old_dev && new_dev != old_dev) | |
7928 | netdev_adjacent_dev_disable(dev, old_dev); | |
1fc70edb TY |
7929 | err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv, |
7930 | extack); | |
32b6d34f TY |
7931 | if (err) { |
7932 | if (old_dev && new_dev != old_dev) | |
7933 | netdev_adjacent_dev_enable(dev, old_dev); | |
7934 | return err; | |
7935 | } | |
7936 | ||
7937 | return 0; | |
7938 | } | |
7939 | EXPORT_SYMBOL(netdev_adjacent_change_prepare); | |
7940 | ||
7941 | void netdev_adjacent_change_commit(struct net_device *old_dev, | |
7942 | struct net_device *new_dev, | |
7943 | struct net_device *dev) | |
7944 | { | |
1fc70edb TY |
7945 | struct netdev_nested_priv priv = { |
7946 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
7947 | .data = NULL, | |
7948 | }; | |
7949 | ||
32b6d34f TY |
7950 | if (!new_dev || !old_dev) |
7951 | return; | |
7952 | ||
7953 | if (new_dev == old_dev) | |
7954 | return; | |
7955 | ||
7956 | netdev_adjacent_dev_enable(dev, old_dev); | |
1fc70edb | 7957 | __netdev_upper_dev_unlink(old_dev, dev, &priv); |
32b6d34f TY |
7958 | } |
7959 | EXPORT_SYMBOL(netdev_adjacent_change_commit); | |
7960 | ||
7961 | void netdev_adjacent_change_abort(struct net_device *old_dev, | |
7962 | struct net_device *new_dev, | |
7963 | struct net_device *dev) | |
7964 | { | |
1fc70edb TY |
7965 | struct netdev_nested_priv priv = { |
7966 | .flags = 0, | |
7967 | .data = NULL, | |
7968 | }; | |
7969 | ||
32b6d34f TY |
7970 | if (!new_dev) |
7971 | return; | |
7972 | ||
7973 | if (old_dev && new_dev != old_dev) | |
7974 | netdev_adjacent_dev_enable(dev, old_dev); | |
7975 | ||
1fc70edb | 7976 | __netdev_upper_dev_unlink(new_dev, dev, &priv); |
32b6d34f TY |
7977 | } |
7978 | EXPORT_SYMBOL(netdev_adjacent_change_abort); | |
7979 | ||
61bd3857 MS |
7980 | /** |
7981 | * netdev_bonding_info_change - Dispatch event about slave change | |
7982 | * @dev: device | |
4a26e453 | 7983 | * @bonding_info: info to dispatch |
61bd3857 MS |
7984 | * |
7985 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
7986 | * The caller must hold the RTNL lock. | |
7987 | */ | |
7988 | void netdev_bonding_info_change(struct net_device *dev, | |
7989 | struct netdev_bonding_info *bonding_info) | |
7990 | { | |
51d0c047 DA |
7991 | struct netdev_notifier_bonding_info info = { |
7992 | .info.dev = dev, | |
7993 | }; | |
61bd3857 MS |
7994 | |
7995 | memcpy(&info.bonding_info, bonding_info, | |
7996 | sizeof(struct netdev_bonding_info)); | |
51d0c047 | 7997 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, |
61bd3857 MS |
7998 | &info.info); |
7999 | } | |
8000 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
8001 | ||
9309f97a PM |
8002 | static int netdev_offload_xstats_enable_l3(struct net_device *dev, |
8003 | struct netlink_ext_ack *extack) | |
8004 | { | |
8005 | struct netdev_notifier_offload_xstats_info info = { | |
8006 | .info.dev = dev, | |
8007 | .info.extack = extack, | |
8008 | .type = NETDEV_OFFLOAD_XSTATS_TYPE_L3, | |
8009 | }; | |
8010 | int err; | |
8011 | int rc; | |
8012 | ||
8013 | dev->offload_xstats_l3 = kzalloc(sizeof(*dev->offload_xstats_l3), | |
8014 | GFP_KERNEL); | |
8015 | if (!dev->offload_xstats_l3) | |
8016 | return -ENOMEM; | |
8017 | ||
8018 | rc = call_netdevice_notifiers_info_robust(NETDEV_OFFLOAD_XSTATS_ENABLE, | |
8019 | NETDEV_OFFLOAD_XSTATS_DISABLE, | |
8020 | &info.info); | |
8021 | err = notifier_to_errno(rc); | |
8022 | if (err) | |
8023 | goto free_stats; | |
8024 | ||
8025 | return 0; | |
8026 | ||
8027 | free_stats: | |
8028 | kfree(dev->offload_xstats_l3); | |
8029 | dev->offload_xstats_l3 = NULL; | |
8030 | return err; | |
8031 | } | |
8032 | ||
8033 | int netdev_offload_xstats_enable(struct net_device *dev, | |
8034 | enum netdev_offload_xstats_type type, | |
8035 | struct netlink_ext_ack *extack) | |
8036 | { | |
8037 | ASSERT_RTNL(); | |
8038 | ||
8039 | if (netdev_offload_xstats_enabled(dev, type)) | |
8040 | return -EALREADY; | |
8041 | ||
8042 | switch (type) { | |
8043 | case NETDEV_OFFLOAD_XSTATS_TYPE_L3: | |
8044 | return netdev_offload_xstats_enable_l3(dev, extack); | |
8045 | } | |
8046 | ||
8047 | WARN_ON(1); | |
8048 | return -EINVAL; | |
8049 | } | |
8050 | EXPORT_SYMBOL(netdev_offload_xstats_enable); | |
8051 | ||
8052 | static void netdev_offload_xstats_disable_l3(struct net_device *dev) | |
8053 | { | |
8054 | struct netdev_notifier_offload_xstats_info info = { | |
8055 | .info.dev = dev, | |
8056 | .type = NETDEV_OFFLOAD_XSTATS_TYPE_L3, | |
8057 | }; | |
8058 | ||
8059 | call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_DISABLE, | |
8060 | &info.info); | |
8061 | kfree(dev->offload_xstats_l3); | |
8062 | dev->offload_xstats_l3 = NULL; | |
8063 | } | |
8064 | ||
8065 | int netdev_offload_xstats_disable(struct net_device *dev, | |
8066 | enum netdev_offload_xstats_type type) | |
8067 | { | |
8068 | ASSERT_RTNL(); | |
8069 | ||
8070 | if (!netdev_offload_xstats_enabled(dev, type)) | |
8071 | return -EALREADY; | |
8072 | ||
8073 | switch (type) { | |
8074 | case NETDEV_OFFLOAD_XSTATS_TYPE_L3: | |
8075 | netdev_offload_xstats_disable_l3(dev); | |
8076 | return 0; | |
8077 | } | |
8078 | ||
8079 | WARN_ON(1); | |
8080 | return -EINVAL; | |
8081 | } | |
8082 | EXPORT_SYMBOL(netdev_offload_xstats_disable); | |
8083 | ||
8084 | static void netdev_offload_xstats_disable_all(struct net_device *dev) | |
8085 | { | |
8086 | netdev_offload_xstats_disable(dev, NETDEV_OFFLOAD_XSTATS_TYPE_L3); | |
8087 | } | |
8088 | ||
8089 | static struct rtnl_hw_stats64 * | |
8090 | netdev_offload_xstats_get_ptr(const struct net_device *dev, | |
8091 | enum netdev_offload_xstats_type type) | |
8092 | { | |
8093 | switch (type) { | |
8094 | case NETDEV_OFFLOAD_XSTATS_TYPE_L3: | |
8095 | return dev->offload_xstats_l3; | |
8096 | } | |
8097 | ||
8098 | WARN_ON(1); | |
8099 | return NULL; | |
8100 | } | |
8101 | ||
8102 | bool netdev_offload_xstats_enabled(const struct net_device *dev, | |
8103 | enum netdev_offload_xstats_type type) | |
8104 | { | |
8105 | ASSERT_RTNL(); | |
8106 | ||
8107 | return netdev_offload_xstats_get_ptr(dev, type); | |
8108 | } | |
8109 | EXPORT_SYMBOL(netdev_offload_xstats_enabled); | |
8110 | ||
8111 | struct netdev_notifier_offload_xstats_ru { | |
8112 | bool used; | |
8113 | }; | |
8114 | ||
8115 | struct netdev_notifier_offload_xstats_rd { | |
8116 | struct rtnl_hw_stats64 stats; | |
8117 | bool used; | |
8118 | }; | |
8119 | ||
8120 | static void netdev_hw_stats64_add(struct rtnl_hw_stats64 *dest, | |
8121 | const struct rtnl_hw_stats64 *src) | |
8122 | { | |
8123 | dest->rx_packets += src->rx_packets; | |
8124 | dest->tx_packets += src->tx_packets; | |
8125 | dest->rx_bytes += src->rx_bytes; | |
8126 | dest->tx_bytes += src->tx_bytes; | |
8127 | dest->rx_errors += src->rx_errors; | |
8128 | dest->tx_errors += src->tx_errors; | |
8129 | dest->rx_dropped += src->rx_dropped; | |
8130 | dest->tx_dropped += src->tx_dropped; | |
8131 | dest->multicast += src->multicast; | |
8132 | } | |
8133 | ||
8134 | static int netdev_offload_xstats_get_used(struct net_device *dev, | |
8135 | enum netdev_offload_xstats_type type, | |
8136 | bool *p_used, | |
8137 | struct netlink_ext_ack *extack) | |
8138 | { | |
8139 | struct netdev_notifier_offload_xstats_ru report_used = {}; | |
8140 | struct netdev_notifier_offload_xstats_info info = { | |
8141 | .info.dev = dev, | |
8142 | .info.extack = extack, | |
8143 | .type = type, | |
8144 | .report_used = &report_used, | |
8145 | }; | |
8146 | int rc; | |
8147 | ||
8148 | WARN_ON(!netdev_offload_xstats_enabled(dev, type)); | |
8149 | rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_USED, | |
8150 | &info.info); | |
8151 | *p_used = report_used.used; | |
8152 | return notifier_to_errno(rc); | |
8153 | } | |
8154 | ||
8155 | static int netdev_offload_xstats_get_stats(struct net_device *dev, | |
8156 | enum netdev_offload_xstats_type type, | |
8157 | struct rtnl_hw_stats64 *p_stats, | |
8158 | bool *p_used, | |
8159 | struct netlink_ext_ack *extack) | |
8160 | { | |
8161 | struct netdev_notifier_offload_xstats_rd report_delta = {}; | |
8162 | struct netdev_notifier_offload_xstats_info info = { | |
8163 | .info.dev = dev, | |
8164 | .info.extack = extack, | |
8165 | .type = type, | |
8166 | .report_delta = &report_delta, | |
8167 | }; | |
8168 | struct rtnl_hw_stats64 *stats; | |
8169 | int rc; | |
8170 | ||
8171 | stats = netdev_offload_xstats_get_ptr(dev, type); | |
8172 | if (WARN_ON(!stats)) | |
8173 | return -EINVAL; | |
8174 | ||
8175 | rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_DELTA, | |
8176 | &info.info); | |
8177 | ||
8178 | /* Cache whatever we got, even if there was an error, otherwise the | |
8179 | * successful stats retrievals would get lost. | |
8180 | */ | |
8181 | netdev_hw_stats64_add(stats, &report_delta.stats); | |
8182 | ||
8183 | if (p_stats) | |
8184 | *p_stats = *stats; | |
8185 | *p_used = report_delta.used; | |
8186 | ||
8187 | return notifier_to_errno(rc); | |
8188 | } | |
8189 | ||
8190 | int netdev_offload_xstats_get(struct net_device *dev, | |
8191 | enum netdev_offload_xstats_type type, | |
8192 | struct rtnl_hw_stats64 *p_stats, bool *p_used, | |
8193 | struct netlink_ext_ack *extack) | |
8194 | { | |
8195 | ASSERT_RTNL(); | |
8196 | ||
8197 | if (p_stats) | |
8198 | return netdev_offload_xstats_get_stats(dev, type, p_stats, | |
8199 | p_used, extack); | |
8200 | else | |
8201 | return netdev_offload_xstats_get_used(dev, type, p_used, | |
8202 | extack); | |
8203 | } | |
8204 | EXPORT_SYMBOL(netdev_offload_xstats_get); | |
8205 | ||
8206 | void | |
8207 | netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *report_delta, | |
8208 | const struct rtnl_hw_stats64 *stats) | |
8209 | { | |
8210 | report_delta->used = true; | |
8211 | netdev_hw_stats64_add(&report_delta->stats, stats); | |
8212 | } | |
8213 | EXPORT_SYMBOL(netdev_offload_xstats_report_delta); | |
8214 | ||
8215 | void | |
8216 | netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *report_used) | |
8217 | { | |
8218 | report_used->used = true; | |
8219 | } | |
8220 | EXPORT_SYMBOL(netdev_offload_xstats_report_used); | |
8221 | ||
8222 | void netdev_offload_xstats_push_delta(struct net_device *dev, | |
8223 | enum netdev_offload_xstats_type type, | |
8224 | const struct rtnl_hw_stats64 *p_stats) | |
8225 | { | |
8226 | struct rtnl_hw_stats64 *stats; | |
8227 | ||
8228 | ASSERT_RTNL(); | |
8229 | ||
8230 | stats = netdev_offload_xstats_get_ptr(dev, type); | |
8231 | if (WARN_ON(!stats)) | |
8232 | return; | |
8233 | ||
8234 | netdev_hw_stats64_add(stats, p_stats); | |
8235 | } | |
8236 | EXPORT_SYMBOL(netdev_offload_xstats_push_delta); | |
8237 | ||
cff9f12b MG |
8238 | /** |
8239 | * netdev_get_xmit_slave - Get the xmit slave of master device | |
8842500d | 8240 | * @dev: device |
cff9f12b MG |
8241 | * @skb: The packet |
8242 | * @all_slaves: assume all the slaves are active | |
8243 | * | |
8244 | * The reference counters are not incremented so the caller must be | |
8245 | * careful with locks. The caller must hold RCU lock. | |
8246 | * %NULL is returned if no slave is found. | |
8247 | */ | |
8248 | ||
8249 | struct net_device *netdev_get_xmit_slave(struct net_device *dev, | |
8250 | struct sk_buff *skb, | |
8251 | bool all_slaves) | |
8252 | { | |
8253 | const struct net_device_ops *ops = dev->netdev_ops; | |
8254 | ||
8255 | if (!ops->ndo_get_xmit_slave) | |
8256 | return NULL; | |
8257 | return ops->ndo_get_xmit_slave(dev, skb, all_slaves); | |
8258 | } | |
8259 | EXPORT_SYMBOL(netdev_get_xmit_slave); | |
8260 | ||
719a402c TT |
8261 | static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev, |
8262 | struct sock *sk) | |
8263 | { | |
8264 | const struct net_device_ops *ops = dev->netdev_ops; | |
8265 | ||
8266 | if (!ops->ndo_sk_get_lower_dev) | |
8267 | return NULL; | |
8268 | return ops->ndo_sk_get_lower_dev(dev, sk); | |
8269 | } | |
8270 | ||
8271 | /** | |
8272 | * netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket | |
8273 | * @dev: device | |
8274 | * @sk: the socket | |
8275 | * | |
8276 | * %NULL is returned if no lower device is found. | |
8277 | */ | |
8278 | ||
8279 | struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, | |
8280 | struct sock *sk) | |
8281 | { | |
8282 | struct net_device *lower; | |
8283 | ||
8284 | lower = netdev_sk_get_lower_dev(dev, sk); | |
8285 | while (lower) { | |
8286 | dev = lower; | |
8287 | lower = netdev_sk_get_lower_dev(dev, sk); | |
8288 | } | |
8289 | ||
8290 | return dev; | |
8291 | } | |
8292 | EXPORT_SYMBOL(netdev_sk_get_lowest_dev); | |
8293 | ||
2ce1ee17 | 8294 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
8295 | { |
8296 | struct netdev_adjacent *iter; | |
8297 | ||
8298 | struct net *net = dev_net(dev); | |
8299 | ||
8300 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 8301 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8302 | continue; |
8303 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8304 | &iter->dev->adj_list.lower); | |
8305 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
8306 | &dev->adj_list.upper); | |
8307 | } | |
8308 | ||
8309 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 8310 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8311 | continue; |
8312 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8313 | &iter->dev->adj_list.upper); | |
8314 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
8315 | &dev->adj_list.lower); | |
8316 | } | |
8317 | } | |
8318 | ||
2ce1ee17 | 8319 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
8320 | { |
8321 | struct netdev_adjacent *iter; | |
8322 | ||
8323 | struct net *net = dev_net(dev); | |
8324 | ||
8325 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 8326 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8327 | continue; |
8328 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
8329 | &iter->dev->adj_list.lower); | |
8330 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
8331 | &dev->adj_list.upper); | |
8332 | } | |
8333 | ||
8334 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 8335 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8336 | continue; |
8337 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
8338 | &iter->dev->adj_list.upper); | |
8339 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
8340 | &dev->adj_list.lower); | |
8341 | } | |
8342 | } | |
8343 | ||
5bb025fa | 8344 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 8345 | { |
5bb025fa | 8346 | struct netdev_adjacent *iter; |
402dae96 | 8347 | |
4c75431a AF |
8348 | struct net *net = dev_net(dev); |
8349 | ||
5bb025fa | 8350 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
be4da0e3 | 8351 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 8352 | continue; |
5bb025fa VF |
8353 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
8354 | &iter->dev->adj_list.lower); | |
8355 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8356 | &iter->dev->adj_list.lower); | |
8357 | } | |
402dae96 | 8358 | |
5bb025fa | 8359 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
be4da0e3 | 8360 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 8361 | continue; |
5bb025fa VF |
8362 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
8363 | &iter->dev->adj_list.upper); | |
8364 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8365 | &iter->dev->adj_list.upper); | |
8366 | } | |
402dae96 | 8367 | } |
402dae96 VF |
8368 | |
8369 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
8370 | struct net_device *lower_dev) | |
8371 | { | |
8372 | struct netdev_adjacent *lower; | |
8373 | ||
8374 | if (!lower_dev) | |
8375 | return NULL; | |
6ea29da1 | 8376 | lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
402dae96 VF |
8377 | if (!lower) |
8378 | return NULL; | |
8379 | ||
8380 | return lower->private; | |
8381 | } | |
8382 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
8383 | ||
4085ebe8 | 8384 | |
04d48266 | 8385 | /** |
c1639be9 | 8386 | * netdev_lower_state_changed - Dispatch event about lower device state change |
04d48266 JP |
8387 | * @lower_dev: device |
8388 | * @lower_state_info: state to dispatch | |
8389 | * | |
8390 | * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. | |
8391 | * The caller must hold the RTNL lock. | |
8392 | */ | |
8393 | void netdev_lower_state_changed(struct net_device *lower_dev, | |
8394 | void *lower_state_info) | |
8395 | { | |
51d0c047 DA |
8396 | struct netdev_notifier_changelowerstate_info changelowerstate_info = { |
8397 | .info.dev = lower_dev, | |
8398 | }; | |
04d48266 JP |
8399 | |
8400 | ASSERT_RTNL(); | |
8401 | changelowerstate_info.lower_state_info = lower_state_info; | |
51d0c047 | 8402 | call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, |
04d48266 JP |
8403 | &changelowerstate_info.info); |
8404 | } | |
8405 | EXPORT_SYMBOL(netdev_lower_state_changed); | |
8406 | ||
b6c40d68 PM |
8407 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
8408 | { | |
d314774c SH |
8409 | const struct net_device_ops *ops = dev->netdev_ops; |
8410 | ||
d2615bf4 | 8411 | if (ops->ndo_change_rx_flags) |
d314774c | 8412 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
8413 | } |
8414 | ||
991fb3f7 | 8415 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 8416 | { |
b536db93 | 8417 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
8418 | kuid_t uid; |
8419 | kgid_t gid; | |
1da177e4 | 8420 | |
24023451 PM |
8421 | ASSERT_RTNL(); |
8422 | ||
dad9b335 WC |
8423 | dev->flags |= IFF_PROMISC; |
8424 | dev->promiscuity += inc; | |
8425 | if (dev->promiscuity == 0) { | |
8426 | /* | |
8427 | * Avoid overflow. | |
8428 | * If inc causes overflow, untouch promisc and return error. | |
8429 | */ | |
8430 | if (inc < 0) | |
8431 | dev->flags &= ~IFF_PROMISC; | |
8432 | else { | |
8433 | dev->promiscuity -= inc; | |
5b92be64 | 8434 | netdev_warn(dev, "promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n"); |
dad9b335 WC |
8435 | return -EOVERFLOW; |
8436 | } | |
8437 | } | |
52609c0b | 8438 | if (dev->flags != old_flags) { |
3ba0bf47 JB |
8439 | netdev_info(dev, "%s promiscuous mode\n", |
8440 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
8441 | if (audit_enabled) { |
8442 | current_uid_gid(&uid, &gid); | |
cdfb6b34 RGB |
8443 | audit_log(audit_context(), GFP_ATOMIC, |
8444 | AUDIT_ANOM_PROMISCUOUS, | |
8445 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
8446 | dev->name, (dev->flags & IFF_PROMISC), | |
8447 | (old_flags & IFF_PROMISC), | |
8448 | from_kuid(&init_user_ns, audit_get_loginuid(current)), | |
8449 | from_kuid(&init_user_ns, uid), | |
8450 | from_kgid(&init_user_ns, gid), | |
8451 | audit_get_sessionid(current)); | |
8192b0c4 | 8452 | } |
24023451 | 8453 | |
b6c40d68 | 8454 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 8455 | } |
991fb3f7 | 8456 | if (notify) |
1d997f10 | 8457 | __dev_notify_flags(dev, old_flags, IFF_PROMISC, 0, NULL); |
dad9b335 | 8458 | return 0; |
1da177e4 LT |
8459 | } |
8460 | ||
4417da66 PM |
8461 | /** |
8462 | * dev_set_promiscuity - update promiscuity count on a device | |
8463 | * @dev: device | |
8464 | * @inc: modifier | |
8465 | * | |
8466 | * Add or remove promiscuity from a device. While the count in the device | |
8467 | * remains above zero the interface remains promiscuous. Once it hits zero | |
8468 | * the device reverts back to normal filtering operation. A negative inc | |
8469 | * value is used to drop promiscuity on the device. | |
dad9b335 | 8470 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 8471 | */ |
dad9b335 | 8472 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 8473 | { |
b536db93 | 8474 | unsigned int old_flags = dev->flags; |
dad9b335 | 8475 | int err; |
4417da66 | 8476 | |
991fb3f7 | 8477 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 8478 | if (err < 0) |
dad9b335 | 8479 | return err; |
4417da66 PM |
8480 | if (dev->flags != old_flags) |
8481 | dev_set_rx_mode(dev); | |
dad9b335 | 8482 | return err; |
4417da66 | 8483 | } |
d1b19dff | 8484 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 8485 | |
991fb3f7 | 8486 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 8487 | { |
991fb3f7 | 8488 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 8489 | |
24023451 PM |
8490 | ASSERT_RTNL(); |
8491 | ||
1da177e4 | 8492 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
8493 | dev->allmulti += inc; |
8494 | if (dev->allmulti == 0) { | |
8495 | /* | |
8496 | * Avoid overflow. | |
8497 | * If inc causes overflow, untouch allmulti and return error. | |
8498 | */ | |
8499 | if (inc < 0) | |
8500 | dev->flags &= ~IFF_ALLMULTI; | |
8501 | else { | |
8502 | dev->allmulti -= inc; | |
5b92be64 | 8503 | netdev_warn(dev, "allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n"); |
dad9b335 WC |
8504 | return -EOVERFLOW; |
8505 | } | |
8506 | } | |
24023451 | 8507 | if (dev->flags ^ old_flags) { |
802dcbd6 JB |
8508 | netdev_info(dev, "%s allmulticast mode\n", |
8509 | dev->flags & IFF_ALLMULTI ? "entered" : "left"); | |
b6c40d68 | 8510 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 8511 | dev_set_rx_mode(dev); |
991fb3f7 ND |
8512 | if (notify) |
8513 | __dev_notify_flags(dev, old_flags, | |
1d997f10 | 8514 | dev->gflags ^ old_gflags, 0, NULL); |
24023451 | 8515 | } |
dad9b335 | 8516 | return 0; |
4417da66 | 8517 | } |
991fb3f7 ND |
8518 | |
8519 | /** | |
8520 | * dev_set_allmulti - update allmulti count on a device | |
8521 | * @dev: device | |
8522 | * @inc: modifier | |
8523 | * | |
8524 | * Add or remove reception of all multicast frames to a device. While the | |
8525 | * count in the device remains above zero the interface remains listening | |
8526 | * to all interfaces. Once it hits zero the device reverts back to normal | |
8527 | * filtering operation. A negative @inc value is used to drop the counter | |
8528 | * when releasing a resource needing all multicasts. | |
8529 | * Return 0 if successful or a negative errno code on error. | |
8530 | */ | |
8531 | ||
8532 | int dev_set_allmulti(struct net_device *dev, int inc) | |
8533 | { | |
8534 | return __dev_set_allmulti(dev, inc, true); | |
8535 | } | |
d1b19dff | 8536 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
8537 | |
8538 | /* | |
8539 | * Upload unicast and multicast address lists to device and | |
8540 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 8541 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
8542 | * are present. |
8543 | */ | |
8544 | void __dev_set_rx_mode(struct net_device *dev) | |
8545 | { | |
d314774c SH |
8546 | const struct net_device_ops *ops = dev->netdev_ops; |
8547 | ||
4417da66 PM |
8548 | /* dev_open will call this function so the list will stay sane. */ |
8549 | if (!(dev->flags&IFF_UP)) | |
8550 | return; | |
8551 | ||
8552 | if (!netif_device_present(dev)) | |
40b77c94 | 8553 | return; |
4417da66 | 8554 | |
01789349 | 8555 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
8556 | /* Unicast addresses changes may only happen under the rtnl, |
8557 | * therefore calling __dev_set_promiscuity here is safe. | |
8558 | */ | |
32e7bfc4 | 8559 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 8560 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 8561 | dev->uc_promisc = true; |
32e7bfc4 | 8562 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 8563 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 8564 | dev->uc_promisc = false; |
4417da66 | 8565 | } |
4417da66 | 8566 | } |
01789349 JP |
8567 | |
8568 | if (ops->ndo_set_rx_mode) | |
8569 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
8570 | } |
8571 | ||
8572 | void dev_set_rx_mode(struct net_device *dev) | |
8573 | { | |
b9e40857 | 8574 | netif_addr_lock_bh(dev); |
4417da66 | 8575 | __dev_set_rx_mode(dev); |
b9e40857 | 8576 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
8577 | } |
8578 | ||
f0db275a SH |
8579 | /** |
8580 | * dev_get_flags - get flags reported to userspace | |
8581 | * @dev: device | |
8582 | * | |
8583 | * Get the combination of flag bits exported through APIs to userspace. | |
8584 | */ | |
95c96174 | 8585 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 8586 | { |
95c96174 | 8587 | unsigned int flags; |
1da177e4 LT |
8588 | |
8589 | flags = (dev->flags & ~(IFF_PROMISC | | |
8590 | IFF_ALLMULTI | | |
b00055aa SR |
8591 | IFF_RUNNING | |
8592 | IFF_LOWER_UP | | |
8593 | IFF_DORMANT)) | | |
1da177e4 LT |
8594 | (dev->gflags & (IFF_PROMISC | |
8595 | IFF_ALLMULTI)); | |
8596 | ||
b00055aa SR |
8597 | if (netif_running(dev)) { |
8598 | if (netif_oper_up(dev)) | |
8599 | flags |= IFF_RUNNING; | |
8600 | if (netif_carrier_ok(dev)) | |
8601 | flags |= IFF_LOWER_UP; | |
8602 | if (netif_dormant(dev)) | |
8603 | flags |= IFF_DORMANT; | |
8604 | } | |
1da177e4 LT |
8605 | |
8606 | return flags; | |
8607 | } | |
d1b19dff | 8608 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 8609 | |
6d040321 PM |
8610 | int __dev_change_flags(struct net_device *dev, unsigned int flags, |
8611 | struct netlink_ext_ack *extack) | |
1da177e4 | 8612 | { |
b536db93 | 8613 | unsigned int old_flags = dev->flags; |
bd380811 | 8614 | int ret; |
1da177e4 | 8615 | |
24023451 PM |
8616 | ASSERT_RTNL(); |
8617 | ||
1da177e4 LT |
8618 | /* |
8619 | * Set the flags on our device. | |
8620 | */ | |
8621 | ||
8622 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
8623 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
8624 | IFF_AUTOMEDIA)) | | |
8625 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
8626 | IFF_ALLMULTI)); | |
8627 | ||
8628 | /* | |
8629 | * Load in the correct multicast list now the flags have changed. | |
8630 | */ | |
8631 | ||
b6c40d68 PM |
8632 | if ((old_flags ^ flags) & IFF_MULTICAST) |
8633 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 8634 | |
4417da66 | 8635 | dev_set_rx_mode(dev); |
1da177e4 LT |
8636 | |
8637 | /* | |
8638 | * Have we downed the interface. We handle IFF_UP ourselves | |
8639 | * according to user attempts to set it, rather than blindly | |
8640 | * setting it. | |
8641 | */ | |
8642 | ||
8643 | ret = 0; | |
7051b88a | 8644 | if ((old_flags ^ flags) & IFF_UP) { |
8645 | if (old_flags & IFF_UP) | |
8646 | __dev_close(dev); | |
8647 | else | |
40c900aa | 8648 | ret = __dev_open(dev, extack); |
7051b88a | 8649 | } |
1da177e4 | 8650 | |
1da177e4 | 8651 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 8652 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 8653 | unsigned int old_flags = dev->flags; |
d1b19dff | 8654 | |
1da177e4 | 8655 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
8656 | |
8657 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
8658 | if (dev->flags != old_flags) | |
8659 | dev_set_rx_mode(dev); | |
1da177e4 LT |
8660 | } |
8661 | ||
8662 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
eb13da1a | 8663 | * is important. Some (broken) drivers set IFF_PROMISC, when |
8664 | * IFF_ALLMULTI is requested not asking us and not reporting. | |
1da177e4 LT |
8665 | */ |
8666 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
8667 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
8668 | ||
1da177e4 | 8669 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 8670 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
8671 | } |
8672 | ||
bd380811 PM |
8673 | return ret; |
8674 | } | |
8675 | ||
a528c219 | 8676 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
1d997f10 HL |
8677 | unsigned int gchanges, u32 portid, |
8678 | const struct nlmsghdr *nlh) | |
bd380811 PM |
8679 | { |
8680 | unsigned int changes = dev->flags ^ old_flags; | |
8681 | ||
a528c219 | 8682 | if (gchanges) |
1d997f10 | 8683 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC, portid, nlh); |
a528c219 | 8684 | |
bd380811 PM |
8685 | if (changes & IFF_UP) { |
8686 | if (dev->flags & IFF_UP) | |
8687 | call_netdevice_notifiers(NETDEV_UP, dev); | |
8688 | else | |
8689 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
8690 | } | |
8691 | ||
8692 | if (dev->flags & IFF_UP && | |
be9efd36 | 8693 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
51d0c047 DA |
8694 | struct netdev_notifier_change_info change_info = { |
8695 | .info = { | |
8696 | .dev = dev, | |
8697 | }, | |
8698 | .flags_changed = changes, | |
8699 | }; | |
be9efd36 | 8700 | |
51d0c047 | 8701 | call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); |
be9efd36 | 8702 | } |
bd380811 PM |
8703 | } |
8704 | ||
8705 | /** | |
8706 | * dev_change_flags - change device settings | |
8707 | * @dev: device | |
8708 | * @flags: device state flags | |
567c5e13 | 8709 | * @extack: netlink extended ack |
bd380811 PM |
8710 | * |
8711 | * Change settings on device based state flags. The flags are | |
8712 | * in the userspace exported format. | |
8713 | */ | |
567c5e13 PM |
8714 | int dev_change_flags(struct net_device *dev, unsigned int flags, |
8715 | struct netlink_ext_ack *extack) | |
bd380811 | 8716 | { |
b536db93 | 8717 | int ret; |
991fb3f7 | 8718 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 | 8719 | |
6d040321 | 8720 | ret = __dev_change_flags(dev, flags, extack); |
bd380811 PM |
8721 | if (ret < 0) |
8722 | return ret; | |
8723 | ||
991fb3f7 | 8724 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
1d997f10 | 8725 | __dev_notify_flags(dev, old_flags, changes, 0, NULL); |
1da177e4 LT |
8726 | return ret; |
8727 | } | |
d1b19dff | 8728 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 8729 | |
f51048c3 | 8730 | int __dev_set_mtu(struct net_device *dev, int new_mtu) |
2315dc91 VF |
8731 | { |
8732 | const struct net_device_ops *ops = dev->netdev_ops; | |
8733 | ||
8734 | if (ops->ndo_change_mtu) | |
8735 | return ops->ndo_change_mtu(dev, new_mtu); | |
8736 | ||
501a90c9 ED |
8737 | /* Pairs with all the lockless reads of dev->mtu in the stack */ |
8738 | WRITE_ONCE(dev->mtu, new_mtu); | |
2315dc91 VF |
8739 | return 0; |
8740 | } | |
f51048c3 | 8741 | EXPORT_SYMBOL(__dev_set_mtu); |
2315dc91 | 8742 | |
d836f5c6 ED |
8743 | int dev_validate_mtu(struct net_device *dev, int new_mtu, |
8744 | struct netlink_ext_ack *extack) | |
8745 | { | |
8746 | /* MTU must be positive, and in range */ | |
8747 | if (new_mtu < 0 || new_mtu < dev->min_mtu) { | |
8748 | NL_SET_ERR_MSG(extack, "mtu less than device minimum"); | |
8749 | return -EINVAL; | |
8750 | } | |
8751 | ||
8752 | if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { | |
8753 | NL_SET_ERR_MSG(extack, "mtu greater than device maximum"); | |
8754 | return -EINVAL; | |
8755 | } | |
8756 | return 0; | |
8757 | } | |
8758 | ||
f0db275a | 8759 | /** |
7a4c53be | 8760 | * dev_set_mtu_ext - Change maximum transfer unit |
f0db275a SH |
8761 | * @dev: device |
8762 | * @new_mtu: new transfer unit | |
7a4c53be | 8763 | * @extack: netlink extended ack |
f0db275a SH |
8764 | * |
8765 | * Change the maximum transfer size of the network device. | |
8766 | */ | |
7a4c53be SH |
8767 | int dev_set_mtu_ext(struct net_device *dev, int new_mtu, |
8768 | struct netlink_ext_ack *extack) | |
1da177e4 | 8769 | { |
2315dc91 | 8770 | int err, orig_mtu; |
1da177e4 LT |
8771 | |
8772 | if (new_mtu == dev->mtu) | |
8773 | return 0; | |
8774 | ||
d836f5c6 ED |
8775 | err = dev_validate_mtu(dev, new_mtu, extack); |
8776 | if (err) | |
8777 | return err; | |
1da177e4 LT |
8778 | |
8779 | if (!netif_device_present(dev)) | |
8780 | return -ENODEV; | |
8781 | ||
1d486bfb VF |
8782 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
8783 | err = notifier_to_errno(err); | |
8784 | if (err) | |
8785 | return err; | |
d314774c | 8786 | |
2315dc91 VF |
8787 | orig_mtu = dev->mtu; |
8788 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 8789 | |
2315dc91 | 8790 | if (!err) { |
af7d6cce SD |
8791 | err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8792 | orig_mtu); | |
2315dc91 VF |
8793 | err = notifier_to_errno(err); |
8794 | if (err) { | |
8795 | /* setting mtu back and notifying everyone again, | |
8796 | * so that they have a chance to revert changes. | |
8797 | */ | |
8798 | __dev_set_mtu(dev, orig_mtu); | |
af7d6cce SD |
8799 | call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8800 | new_mtu); | |
2315dc91 VF |
8801 | } |
8802 | } | |
1da177e4 LT |
8803 | return err; |
8804 | } | |
7a4c53be SH |
8805 | |
8806 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
8807 | { | |
8808 | struct netlink_ext_ack extack; | |
8809 | int err; | |
8810 | ||
a6bcfc89 | 8811 | memset(&extack, 0, sizeof(extack)); |
7a4c53be | 8812 | err = dev_set_mtu_ext(dev, new_mtu, &extack); |
a6bcfc89 | 8813 | if (err && extack._msg) |
7a4c53be SH |
8814 | net_err_ratelimited("%s: %s\n", dev->name, extack._msg); |
8815 | return err; | |
8816 | } | |
d1b19dff | 8817 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 8818 | |
6a643ddb CW |
8819 | /** |
8820 | * dev_change_tx_queue_len - Change TX queue length of a netdevice | |
8821 | * @dev: device | |
8822 | * @new_len: new tx queue length | |
8823 | */ | |
8824 | int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len) | |
8825 | { | |
8826 | unsigned int orig_len = dev->tx_queue_len; | |
8827 | int res; | |
8828 | ||
8829 | if (new_len != (unsigned int)new_len) | |
8830 | return -ERANGE; | |
8831 | ||
8832 | if (new_len != orig_len) { | |
8833 | dev->tx_queue_len = new_len; | |
8834 | res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); | |
8835 | res = notifier_to_errno(res); | |
7effaf06 TT |
8836 | if (res) |
8837 | goto err_rollback; | |
8838 | res = dev_qdisc_change_tx_queue_len(dev); | |
8839 | if (res) | |
8840 | goto err_rollback; | |
6a643ddb CW |
8841 | } |
8842 | ||
8843 | return 0; | |
7effaf06 TT |
8844 | |
8845 | err_rollback: | |
8846 | netdev_err(dev, "refused to change device tx_queue_len\n"); | |
8847 | dev->tx_queue_len = orig_len; | |
8848 | return res; | |
6a643ddb CW |
8849 | } |
8850 | ||
cbda10fa VD |
8851 | /** |
8852 | * dev_set_group - Change group this device belongs to | |
8853 | * @dev: device | |
8854 | * @new_group: group this device should belong to | |
8855 | */ | |
8856 | void dev_set_group(struct net_device *dev, int new_group) | |
8857 | { | |
8858 | dev->group = new_group; | |
8859 | } | |
cbda10fa | 8860 | |
d59cdf94 PM |
8861 | /** |
8862 | * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR. | |
8863 | * @dev: device | |
8864 | * @addr: new address | |
8865 | * @extack: netlink extended ack | |
8866 | */ | |
8867 | int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, | |
8868 | struct netlink_ext_ack *extack) | |
8869 | { | |
8870 | struct netdev_notifier_pre_changeaddr_info info = { | |
8871 | .info.dev = dev, | |
8872 | .info.extack = extack, | |
8873 | .dev_addr = addr, | |
8874 | }; | |
8875 | int rc; | |
8876 | ||
8877 | rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info); | |
8878 | return notifier_to_errno(rc); | |
8879 | } | |
8880 | EXPORT_SYMBOL(dev_pre_changeaddr_notify); | |
8881 | ||
f0db275a SH |
8882 | /** |
8883 | * dev_set_mac_address - Change Media Access Control Address | |
8884 | * @dev: device | |
8885 | * @sa: new address | |
3a37a963 | 8886 | * @extack: netlink extended ack |
f0db275a SH |
8887 | * |
8888 | * Change the hardware (MAC) address of the device | |
8889 | */ | |
3a37a963 PM |
8890 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, |
8891 | struct netlink_ext_ack *extack) | |
1da177e4 | 8892 | { |
d314774c | 8893 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
8894 | int err; |
8895 | ||
d314774c | 8896 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
8897 | return -EOPNOTSUPP; |
8898 | if (sa->sa_family != dev->type) | |
8899 | return -EINVAL; | |
8900 | if (!netif_device_present(dev)) | |
8901 | return -ENODEV; | |
d59cdf94 PM |
8902 | err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack); |
8903 | if (err) | |
8904 | return err; | |
0ec92a8f PG |
8905 | if (memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) { |
8906 | err = ops->ndo_set_mac_address(dev, sa); | |
8907 | if (err) | |
8908 | return err; | |
8909 | } | |
fbdeca2d | 8910 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 8911 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 8912 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 8913 | return 0; |
1da177e4 | 8914 | } |
d1b19dff | 8915 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 8916 | |
3b23a32a CW |
8917 | static DECLARE_RWSEM(dev_addr_sem); |
8918 | ||
8919 | int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, | |
8920 | struct netlink_ext_ack *extack) | |
8921 | { | |
8922 | int ret; | |
8923 | ||
8924 | down_write(&dev_addr_sem); | |
8925 | ret = dev_set_mac_address(dev, sa, extack); | |
8926 | up_write(&dev_addr_sem); | |
8927 | return ret; | |
8928 | } | |
8929 | EXPORT_SYMBOL(dev_set_mac_address_user); | |
8930 | ||
8931 | int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name) | |
8932 | { | |
b5f0de6d | 8933 | size_t size = sizeof(sa->sa_data_min); |
3b23a32a CW |
8934 | struct net_device *dev; |
8935 | int ret = 0; | |
8936 | ||
8937 | down_read(&dev_addr_sem); | |
8938 | rcu_read_lock(); | |
8939 | ||
8940 | dev = dev_get_by_name_rcu(net, dev_name); | |
8941 | if (!dev) { | |
8942 | ret = -ENODEV; | |
8943 | goto unlock; | |
8944 | } | |
8945 | if (!dev->addr_len) | |
8946 | memset(sa->sa_data, 0, size); | |
8947 | else | |
8948 | memcpy(sa->sa_data, dev->dev_addr, | |
8949 | min_t(size_t, size, dev->addr_len)); | |
8950 | sa->sa_family = dev->type; | |
8951 | ||
8952 | unlock: | |
8953 | rcu_read_unlock(); | |
8954 | up_read(&dev_addr_sem); | |
8955 | return ret; | |
8956 | } | |
8957 | EXPORT_SYMBOL(dev_get_mac_address); | |
8958 | ||
4bf84c35 JP |
8959 | /** |
8960 | * dev_change_carrier - Change device carrier | |
8961 | * @dev: device | |
691b3b7e | 8962 | * @new_carrier: new value |
4bf84c35 JP |
8963 | * |
8964 | * Change device carrier | |
8965 | */ | |
8966 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
8967 | { | |
8968 | const struct net_device_ops *ops = dev->netdev_ops; | |
8969 | ||
8970 | if (!ops->ndo_change_carrier) | |
8971 | return -EOPNOTSUPP; | |
8972 | if (!netif_device_present(dev)) | |
8973 | return -ENODEV; | |
8974 | return ops->ndo_change_carrier(dev, new_carrier); | |
8975 | } | |
4bf84c35 | 8976 | |
66b52b0d JP |
8977 | /** |
8978 | * dev_get_phys_port_id - Get device physical port ID | |
8979 | * @dev: device | |
8980 | * @ppid: port ID | |
8981 | * | |
8982 | * Get device physical port ID | |
8983 | */ | |
8984 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 8985 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
8986 | { |
8987 | const struct net_device_ops *ops = dev->netdev_ops; | |
8988 | ||
8989 | if (!ops->ndo_get_phys_port_id) | |
8990 | return -EOPNOTSUPP; | |
8991 | return ops->ndo_get_phys_port_id(dev, ppid); | |
8992 | } | |
66b52b0d | 8993 | |
db24a904 DA |
8994 | /** |
8995 | * dev_get_phys_port_name - Get device physical port name | |
8996 | * @dev: device | |
8997 | * @name: port name | |
ed49e650 | 8998 | * @len: limit of bytes to copy to name |
db24a904 DA |
8999 | * |
9000 | * Get device physical port name | |
9001 | */ | |
9002 | int dev_get_phys_port_name(struct net_device *dev, | |
9003 | char *name, size_t len) | |
9004 | { | |
9005 | const struct net_device_ops *ops = dev->netdev_ops; | |
af3836df | 9006 | int err; |
db24a904 | 9007 | |
af3836df JP |
9008 | if (ops->ndo_get_phys_port_name) { |
9009 | err = ops->ndo_get_phys_port_name(dev, name, len); | |
9010 | if (err != -EOPNOTSUPP) | |
9011 | return err; | |
9012 | } | |
9013 | return devlink_compat_phys_port_name_get(dev, name, len); | |
db24a904 | 9014 | } |
db24a904 | 9015 | |
d6abc596 FF |
9016 | /** |
9017 | * dev_get_port_parent_id - Get the device's port parent identifier | |
9018 | * @dev: network device | |
9019 | * @ppid: pointer to a storage for the port's parent identifier | |
9020 | * @recurse: allow/disallow recursion to lower devices | |
9021 | * | |
9022 | * Get the devices's port parent identifier | |
9023 | */ | |
9024 | int dev_get_port_parent_id(struct net_device *dev, | |
9025 | struct netdev_phys_item_id *ppid, | |
9026 | bool recurse) | |
9027 | { | |
9028 | const struct net_device_ops *ops = dev->netdev_ops; | |
9029 | struct netdev_phys_item_id first = { }; | |
9030 | struct net_device *lower_dev; | |
9031 | struct list_head *iter; | |
7e1146e8 JP |
9032 | int err; |
9033 | ||
9034 | if (ops->ndo_get_port_parent_id) { | |
9035 | err = ops->ndo_get_port_parent_id(dev, ppid); | |
9036 | if (err != -EOPNOTSUPP) | |
9037 | return err; | |
9038 | } | |
d6abc596 | 9039 | |
7e1146e8 | 9040 | err = devlink_compat_switch_id_get(dev, ppid); |
c0288ae8 | 9041 | if (!recurse || err != -EOPNOTSUPP) |
7e1146e8 | 9042 | return err; |
d6abc596 | 9043 | |
d6abc596 | 9044 | netdev_for_each_lower_dev(dev, lower_dev, iter) { |
c0288ae8 | 9045 | err = dev_get_port_parent_id(lower_dev, ppid, true); |
d6abc596 FF |
9046 | if (err) |
9047 | break; | |
9048 | if (!first.id_len) | |
9049 | first = *ppid; | |
9050 | else if (memcmp(&first, ppid, sizeof(*ppid))) | |
e1b9efe6 | 9051 | return -EOPNOTSUPP; |
d6abc596 FF |
9052 | } |
9053 | ||
9054 | return err; | |
9055 | } | |
9056 | EXPORT_SYMBOL(dev_get_port_parent_id); | |
9057 | ||
9058 | /** | |
9059 | * netdev_port_same_parent_id - Indicate if two network devices have | |
9060 | * the same port parent identifier | |
9061 | * @a: first network device | |
9062 | * @b: second network device | |
9063 | */ | |
9064 | bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b) | |
9065 | { | |
9066 | struct netdev_phys_item_id a_id = { }; | |
9067 | struct netdev_phys_item_id b_id = { }; | |
9068 | ||
9069 | if (dev_get_port_parent_id(a, &a_id, true) || | |
9070 | dev_get_port_parent_id(b, &b_id, true)) | |
9071 | return false; | |
9072 | ||
9073 | return netdev_phys_item_id_same(&a_id, &b_id); | |
9074 | } | |
9075 | EXPORT_SYMBOL(netdev_port_same_parent_id); | |
9076 | ||
5f184269 JP |
9077 | static void netdev_dpll_pin_assign(struct net_device *dev, struct dpll_pin *dpll_pin) |
9078 | { | |
9079 | #if IS_ENABLED(CONFIG_DPLL) | |
9080 | rtnl_lock(); | |
0d60d8df | 9081 | rcu_assign_pointer(dev->dpll_pin, dpll_pin); |
5f184269 JP |
9082 | rtnl_unlock(); |
9083 | #endif | |
9084 | } | |
9085 | ||
9086 | void netdev_dpll_pin_set(struct net_device *dev, struct dpll_pin *dpll_pin) | |
9087 | { | |
9088 | WARN_ON(!dpll_pin); | |
9089 | netdev_dpll_pin_assign(dev, dpll_pin); | |
9090 | } | |
9091 | EXPORT_SYMBOL(netdev_dpll_pin_set); | |
9092 | ||
9093 | void netdev_dpll_pin_clear(struct net_device *dev) | |
9094 | { | |
9095 | netdev_dpll_pin_assign(dev, NULL); | |
9096 | } | |
9097 | EXPORT_SYMBOL(netdev_dpll_pin_clear); | |
9098 | ||
d746d707 | 9099 | /** |
2106efda JK |
9100 | * dev_change_proto_down - set carrier according to proto_down. |
9101 | * | |
d746d707 AK |
9102 | * @dev: device |
9103 | * @proto_down: new value | |
d746d707 AK |
9104 | */ |
9105 | int dev_change_proto_down(struct net_device *dev, bool proto_down) | |
9106 | { | |
2106efda | 9107 | if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) |
d746d707 AK |
9108 | return -EOPNOTSUPP; |
9109 | if (!netif_device_present(dev)) | |
9110 | return -ENODEV; | |
b5899679 AR |
9111 | if (proto_down) |
9112 | netif_carrier_off(dev); | |
9113 | else | |
9114 | netif_carrier_on(dev); | |
9115 | dev->proto_down = proto_down; | |
9116 | return 0; | |
9117 | } | |
b5899679 | 9118 | |
829eb208 RP |
9119 | /** |
9120 | * dev_change_proto_down_reason - proto down reason | |
9121 | * | |
9122 | * @dev: device | |
9123 | * @mask: proto down mask | |
9124 | * @value: proto down value | |
9125 | */ | |
9126 | void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask, | |
9127 | u32 value) | |
9128 | { | |
9129 | int b; | |
9130 | ||
9131 | if (!mask) { | |
9132 | dev->proto_down_reason = value; | |
9133 | } else { | |
9134 | for_each_set_bit(b, &mask, 32) { | |
9135 | if (value & (1 << b)) | |
9136 | dev->proto_down_reason |= BIT(b); | |
9137 | else | |
9138 | dev->proto_down_reason &= ~BIT(b); | |
9139 | } | |
9140 | } | |
9141 | } | |
829eb208 | 9142 | |
aa8d3a71 AN |
9143 | struct bpf_xdp_link { |
9144 | struct bpf_link link; | |
9145 | struct net_device *dev; /* protected by rtnl_lock, no refcnt held */ | |
9146 | int flags; | |
9147 | }; | |
9148 | ||
c8a36f19 | 9149 | static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags) |
d67b9cd2 | 9150 | { |
7f0a8382 AN |
9151 | if (flags & XDP_FLAGS_HW_MODE) |
9152 | return XDP_MODE_HW; | |
9153 | if (flags & XDP_FLAGS_DRV_MODE) | |
9154 | return XDP_MODE_DRV; | |
c8a36f19 AN |
9155 | if (flags & XDP_FLAGS_SKB_MODE) |
9156 | return XDP_MODE_SKB; | |
9157 | return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB; | |
7f0a8382 | 9158 | } |
d67b9cd2 | 9159 | |
7f0a8382 AN |
9160 | static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode) |
9161 | { | |
9162 | switch (mode) { | |
9163 | case XDP_MODE_SKB: | |
9164 | return generic_xdp_install; | |
9165 | case XDP_MODE_DRV: | |
9166 | case XDP_MODE_HW: | |
9167 | return dev->netdev_ops->ndo_bpf; | |
9168 | default: | |
9169 | return NULL; | |
5d867245 | 9170 | } |
7f0a8382 | 9171 | } |
118b4aa2 | 9172 | |
aa8d3a71 AN |
9173 | static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev, |
9174 | enum bpf_xdp_mode mode) | |
9175 | { | |
9176 | return dev->xdp_state[mode].link; | |
9177 | } | |
9178 | ||
7f0a8382 AN |
9179 | static struct bpf_prog *dev_xdp_prog(struct net_device *dev, |
9180 | enum bpf_xdp_mode mode) | |
9181 | { | |
aa8d3a71 AN |
9182 | struct bpf_xdp_link *link = dev_xdp_link(dev, mode); |
9183 | ||
9184 | if (link) | |
9185 | return link->link.prog; | |
7f0a8382 AN |
9186 | return dev->xdp_state[mode].prog; |
9187 | } | |
9188 | ||
879af96f | 9189 | u8 dev_xdp_prog_count(struct net_device *dev) |
998f1729 THJ |
9190 | { |
9191 | u8 count = 0; | |
9192 | int i; | |
9193 | ||
9194 | for (i = 0; i < __MAX_XDP_MODE; i++) | |
9195 | if (dev->xdp_state[i].prog || dev->xdp_state[i].link) | |
9196 | count++; | |
9197 | return count; | |
9198 | } | |
879af96f | 9199 | EXPORT_SYMBOL_GPL(dev_xdp_prog_count); |
998f1729 | 9200 | |
7f0a8382 AN |
9201 | u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode) |
9202 | { | |
9203 | struct bpf_prog *prog = dev_xdp_prog(dev, mode); | |
118b4aa2 | 9204 | |
7f0a8382 AN |
9205 | return prog ? prog->aux->id : 0; |
9206 | } | |
58038695 | 9207 | |
aa8d3a71 AN |
9208 | static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode, |
9209 | struct bpf_xdp_link *link) | |
9210 | { | |
9211 | dev->xdp_state[mode].link = link; | |
9212 | dev->xdp_state[mode].prog = NULL; | |
d67b9cd2 DB |
9213 | } |
9214 | ||
7f0a8382 AN |
9215 | static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode, |
9216 | struct bpf_prog *prog) | |
9217 | { | |
aa8d3a71 | 9218 | dev->xdp_state[mode].link = NULL; |
7f0a8382 | 9219 | dev->xdp_state[mode].prog = prog; |
d67b9cd2 DB |
9220 | } |
9221 | ||
7f0a8382 AN |
9222 | static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode, |
9223 | bpf_op_t bpf_op, struct netlink_ext_ack *extack, | |
9224 | u32 flags, struct bpf_prog *prog) | |
d67b9cd2 | 9225 | { |
f4e63525 | 9226 | struct netdev_bpf xdp; |
7e6897f9 BT |
9227 | int err; |
9228 | ||
d67b9cd2 | 9229 | memset(&xdp, 0, sizeof(xdp)); |
7f0a8382 | 9230 | xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG; |
d67b9cd2 | 9231 | xdp.extack = extack; |
32d60277 | 9232 | xdp.flags = flags; |
d67b9cd2 DB |
9233 | xdp.prog = prog; |
9234 | ||
7f0a8382 AN |
9235 | /* Drivers assume refcnt is already incremented (i.e, prog pointer is |
9236 | * "moved" into driver), so they don't increment it on their own, but | |
9237 | * they do decrement refcnt when program is detached or replaced. | |
9238 | * Given net_device also owns link/prog, we need to bump refcnt here | |
9239 | * to prevent drivers from underflowing it. | |
9240 | */ | |
9241 | if (prog) | |
9242 | bpf_prog_inc(prog); | |
7e6897f9 | 9243 | err = bpf_op(dev, &xdp); |
7f0a8382 AN |
9244 | if (err) { |
9245 | if (prog) | |
9246 | bpf_prog_put(prog); | |
9247 | return err; | |
9248 | } | |
7e6897f9 | 9249 | |
7f0a8382 AN |
9250 | if (mode != XDP_MODE_HW) |
9251 | bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog); | |
7e6897f9 | 9252 | |
7f0a8382 | 9253 | return 0; |
d67b9cd2 DB |
9254 | } |
9255 | ||
bd0b2e7f JK |
9256 | static void dev_xdp_uninstall(struct net_device *dev) |
9257 | { | |
aa8d3a71 | 9258 | struct bpf_xdp_link *link; |
7f0a8382 AN |
9259 | struct bpf_prog *prog; |
9260 | enum bpf_xdp_mode mode; | |
9261 | bpf_op_t bpf_op; | |
bd0b2e7f | 9262 | |
7f0a8382 | 9263 | ASSERT_RTNL(); |
bd0b2e7f | 9264 | |
7f0a8382 AN |
9265 | for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) { |
9266 | prog = dev_xdp_prog(dev, mode); | |
9267 | if (!prog) | |
9268 | continue; | |
bd0b2e7f | 9269 | |
7f0a8382 AN |
9270 | bpf_op = dev_xdp_bpf_op(dev, mode); |
9271 | if (!bpf_op) | |
9272 | continue; | |
bd0b2e7f | 9273 | |
7f0a8382 AN |
9274 | WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); |
9275 | ||
aa8d3a71 AN |
9276 | /* auto-detach link from net device */ |
9277 | link = dev_xdp_link(dev, mode); | |
9278 | if (link) | |
9279 | link->dev = NULL; | |
9280 | else | |
9281 | bpf_prog_put(prog); | |
9282 | ||
9283 | dev_xdp_set_link(dev, mode, NULL); | |
7f0a8382 | 9284 | } |
bd0b2e7f JK |
9285 | } |
9286 | ||
d4baa936 | 9287 | static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack, |
aa8d3a71 AN |
9288 | struct bpf_xdp_link *link, struct bpf_prog *new_prog, |
9289 | struct bpf_prog *old_prog, u32 flags) | |
a7862b45 | 9290 | { |
998f1729 | 9291 | unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES); |
d4baa936 | 9292 | struct bpf_prog *cur_prog; |
879af96f JM |
9293 | struct net_device *upper; |
9294 | struct list_head *iter; | |
d4baa936 | 9295 | enum bpf_xdp_mode mode; |
7f0a8382 | 9296 | bpf_op_t bpf_op; |
a7862b45 BB |
9297 | int err; |
9298 | ||
85de8576 DB |
9299 | ASSERT_RTNL(); |
9300 | ||
aa8d3a71 AN |
9301 | /* either link or prog attachment, never both */ |
9302 | if (link && (new_prog || old_prog)) | |
9303 | return -EINVAL; | |
9304 | /* link supports only XDP mode flags */ | |
9305 | if (link && (flags & ~XDP_FLAGS_MODES)) { | |
9306 | NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment"); | |
9307 | return -EINVAL; | |
9308 | } | |
998f1729 THJ |
9309 | /* just one XDP mode bit should be set, zero defaults to drv/skb mode */ |
9310 | if (num_modes > 1) { | |
d4baa936 AN |
9311 | NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set"); |
9312 | return -EINVAL; | |
9313 | } | |
998f1729 THJ |
9314 | /* avoid ambiguity if offload + drv/skb mode progs are both loaded */ |
9315 | if (!num_modes && dev_xdp_prog_count(dev) > 1) { | |
9316 | NL_SET_ERR_MSG(extack, | |
9317 | "More than one program loaded, unset mode is ambiguous"); | |
9318 | return -EINVAL; | |
9319 | } | |
d4baa936 AN |
9320 | /* old_prog != NULL implies XDP_FLAGS_REPLACE is set */ |
9321 | if (old_prog && !(flags & XDP_FLAGS_REPLACE)) { | |
9322 | NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified"); | |
9323 | return -EINVAL; | |
01dde20c | 9324 | } |
a25717d2 | 9325 | |
c8a36f19 | 9326 | mode = dev_xdp_mode(dev, flags); |
aa8d3a71 AN |
9327 | /* can't replace attached link */ |
9328 | if (dev_xdp_link(dev, mode)) { | |
9329 | NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link"); | |
9330 | return -EBUSY; | |
01dde20c | 9331 | } |
c14a9f63 | 9332 | |
879af96f JM |
9333 | /* don't allow if an upper device already has a program */ |
9334 | netdev_for_each_upper_dev_rcu(dev, upper, iter) { | |
9335 | if (dev_xdp_prog_count(upper) > 0) { | |
9336 | NL_SET_ERR_MSG(extack, "Cannot attach when an upper device already has a program"); | |
9337 | return -EEXIST; | |
9338 | } | |
9339 | } | |
9340 | ||
d4baa936 | 9341 | cur_prog = dev_xdp_prog(dev, mode); |
aa8d3a71 AN |
9342 | /* can't replace attached prog with link */ |
9343 | if (link && cur_prog) { | |
9344 | NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link"); | |
9345 | return -EBUSY; | |
9346 | } | |
d4baa936 AN |
9347 | if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) { |
9348 | NL_SET_ERR_MSG(extack, "Active program does not match expected"); | |
9349 | return -EEXIST; | |
92234c8f | 9350 | } |
c14a9f63 | 9351 | |
aa8d3a71 AN |
9352 | /* put effective new program into new_prog */ |
9353 | if (link) | |
9354 | new_prog = link->link.prog; | |
85de8576 | 9355 | |
d4baa936 AN |
9356 | if (new_prog) { |
9357 | bool offload = mode == XDP_MODE_HW; | |
7f0a8382 AN |
9358 | enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB |
9359 | ? XDP_MODE_DRV : XDP_MODE_SKB; | |
441a3303 | 9360 | |
068d9d1e AN |
9361 | if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) { |
9362 | NL_SET_ERR_MSG(extack, "XDP program already attached"); | |
9363 | return -EBUSY; | |
9364 | } | |
d4baa936 | 9365 | if (!offload && dev_xdp_prog(dev, other_mode)) { |
7f0a8382 | 9366 | NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time"); |
d67b9cd2 | 9367 | return -EEXIST; |
01dde20c | 9368 | } |
9d03ebc7 SF |
9369 | if (!offload && bpf_prog_is_offloaded(new_prog->aux)) { |
9370 | NL_SET_ERR_MSG(extack, "Using offloaded program without HW_MODE flag is not supported"); | |
441a3303 JK |
9371 | return -EINVAL; |
9372 | } | |
2b3486bc SF |
9373 | if (bpf_prog_is_dev_bound(new_prog->aux) && !bpf_offload_dev_match(new_prog, dev)) { |
9374 | NL_SET_ERR_MSG(extack, "Program bound to different device"); | |
441a3303 JK |
9375 | return -EINVAL; |
9376 | } | |
d4baa936 | 9377 | if (new_prog->expected_attach_type == BPF_XDP_DEVMAP) { |
fbee97fe | 9378 | NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device"); |
fbee97fe DA |
9379 | return -EINVAL; |
9380 | } | |
d4baa936 AN |
9381 | if (new_prog->expected_attach_type == BPF_XDP_CPUMAP) { |
9382 | NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device"); | |
92164774 LB |
9383 | return -EINVAL; |
9384 | } | |
d4baa936 | 9385 | } |
92164774 | 9386 | |
d4baa936 AN |
9387 | /* don't call drivers if the effective program didn't change */ |
9388 | if (new_prog != cur_prog) { | |
9389 | bpf_op = dev_xdp_bpf_op(dev, mode); | |
9390 | if (!bpf_op) { | |
9391 | NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode"); | |
9392 | return -EOPNOTSUPP; | |
c14a9f63 | 9393 | } |
a7862b45 | 9394 | |
d4baa936 AN |
9395 | err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog); |
9396 | if (err) | |
9397 | return err; | |
7f0a8382 | 9398 | } |
d4baa936 | 9399 | |
aa8d3a71 AN |
9400 | if (link) |
9401 | dev_xdp_set_link(dev, mode, link); | |
9402 | else | |
9403 | dev_xdp_set_prog(dev, mode, new_prog); | |
d4baa936 AN |
9404 | if (cur_prog) |
9405 | bpf_prog_put(cur_prog); | |
a7862b45 | 9406 | |
7f0a8382 | 9407 | return 0; |
a7862b45 | 9408 | } |
a7862b45 | 9409 | |
aa8d3a71 AN |
9410 | static int dev_xdp_attach_link(struct net_device *dev, |
9411 | struct netlink_ext_ack *extack, | |
9412 | struct bpf_xdp_link *link) | |
9413 | { | |
9414 | return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags); | |
9415 | } | |
9416 | ||
9417 | static int dev_xdp_detach_link(struct net_device *dev, | |
9418 | struct netlink_ext_ack *extack, | |
9419 | struct bpf_xdp_link *link) | |
9420 | { | |
9421 | enum bpf_xdp_mode mode; | |
9422 | bpf_op_t bpf_op; | |
9423 | ||
9424 | ASSERT_RTNL(); | |
9425 | ||
c8a36f19 | 9426 | mode = dev_xdp_mode(dev, link->flags); |
aa8d3a71 AN |
9427 | if (dev_xdp_link(dev, mode) != link) |
9428 | return -EINVAL; | |
9429 | ||
9430 | bpf_op = dev_xdp_bpf_op(dev, mode); | |
9431 | WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); | |
9432 | dev_xdp_set_link(dev, mode, NULL); | |
9433 | return 0; | |
9434 | } | |
9435 | ||
9436 | static void bpf_xdp_link_release(struct bpf_link *link) | |
9437 | { | |
9438 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9439 | ||
9440 | rtnl_lock(); | |
9441 | ||
9442 | /* if racing with net_device's tear down, xdp_link->dev might be | |
9443 | * already NULL, in which case link was already auto-detached | |
9444 | */ | |
73b11c2a | 9445 | if (xdp_link->dev) { |
aa8d3a71 | 9446 | WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link)); |
73b11c2a AN |
9447 | xdp_link->dev = NULL; |
9448 | } | |
aa8d3a71 AN |
9449 | |
9450 | rtnl_unlock(); | |
9451 | } | |
9452 | ||
73b11c2a AN |
9453 | static int bpf_xdp_link_detach(struct bpf_link *link) |
9454 | { | |
9455 | bpf_xdp_link_release(link); | |
9456 | return 0; | |
9457 | } | |
9458 | ||
aa8d3a71 AN |
9459 | static void bpf_xdp_link_dealloc(struct bpf_link *link) |
9460 | { | |
9461 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9462 | ||
9463 | kfree(xdp_link); | |
9464 | } | |
9465 | ||
c1931c97 AN |
9466 | static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link, |
9467 | struct seq_file *seq) | |
9468 | { | |
9469 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9470 | u32 ifindex = 0; | |
9471 | ||
9472 | rtnl_lock(); | |
9473 | if (xdp_link->dev) | |
9474 | ifindex = xdp_link->dev->ifindex; | |
9475 | rtnl_unlock(); | |
9476 | ||
9477 | seq_printf(seq, "ifindex:\t%u\n", ifindex); | |
9478 | } | |
9479 | ||
9480 | static int bpf_xdp_link_fill_link_info(const struct bpf_link *link, | |
9481 | struct bpf_link_info *info) | |
9482 | { | |
9483 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9484 | u32 ifindex = 0; | |
9485 | ||
9486 | rtnl_lock(); | |
9487 | if (xdp_link->dev) | |
9488 | ifindex = xdp_link->dev->ifindex; | |
9489 | rtnl_unlock(); | |
9490 | ||
9491 | info->xdp.ifindex = ifindex; | |
9492 | return 0; | |
9493 | } | |
9494 | ||
026a4c28 AN |
9495 | static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, |
9496 | struct bpf_prog *old_prog) | |
9497 | { | |
9498 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9499 | enum bpf_xdp_mode mode; | |
9500 | bpf_op_t bpf_op; | |
9501 | int err = 0; | |
9502 | ||
9503 | rtnl_lock(); | |
9504 | ||
9505 | /* link might have been auto-released already, so fail */ | |
9506 | if (!xdp_link->dev) { | |
9507 | err = -ENOLINK; | |
9508 | goto out_unlock; | |
9509 | } | |
9510 | ||
9511 | if (old_prog && link->prog != old_prog) { | |
9512 | err = -EPERM; | |
9513 | goto out_unlock; | |
9514 | } | |
9515 | old_prog = link->prog; | |
382778ed THJ |
9516 | if (old_prog->type != new_prog->type || |
9517 | old_prog->expected_attach_type != new_prog->expected_attach_type) { | |
9518 | err = -EINVAL; | |
9519 | goto out_unlock; | |
9520 | } | |
9521 | ||
026a4c28 AN |
9522 | if (old_prog == new_prog) { |
9523 | /* no-op, don't disturb drivers */ | |
9524 | bpf_prog_put(new_prog); | |
9525 | goto out_unlock; | |
9526 | } | |
9527 | ||
c8a36f19 | 9528 | mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags); |
026a4c28 AN |
9529 | bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode); |
9530 | err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL, | |
9531 | xdp_link->flags, new_prog); | |
9532 | if (err) | |
9533 | goto out_unlock; | |
9534 | ||
9535 | old_prog = xchg(&link->prog, new_prog); | |
9536 | bpf_prog_put(old_prog); | |
9537 | ||
9538 | out_unlock: | |
9539 | rtnl_unlock(); | |
9540 | return err; | |
9541 | } | |
9542 | ||
aa8d3a71 AN |
9543 | static const struct bpf_link_ops bpf_xdp_link_lops = { |
9544 | .release = bpf_xdp_link_release, | |
9545 | .dealloc = bpf_xdp_link_dealloc, | |
73b11c2a | 9546 | .detach = bpf_xdp_link_detach, |
c1931c97 AN |
9547 | .show_fdinfo = bpf_xdp_link_show_fdinfo, |
9548 | .fill_link_info = bpf_xdp_link_fill_link_info, | |
026a4c28 | 9549 | .update_prog = bpf_xdp_link_update, |
aa8d3a71 AN |
9550 | }; |
9551 | ||
9552 | int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
9553 | { | |
9554 | struct net *net = current->nsproxy->net_ns; | |
9555 | struct bpf_link_primer link_primer; | |
bf4ea1d0 | 9556 | struct netlink_ext_ack extack = {}; |
aa8d3a71 AN |
9557 | struct bpf_xdp_link *link; |
9558 | struct net_device *dev; | |
9559 | int err, fd; | |
9560 | ||
5acc7d3e | 9561 | rtnl_lock(); |
aa8d3a71 | 9562 | dev = dev_get_by_index(net, attr->link_create.target_ifindex); |
5acc7d3e XZ |
9563 | if (!dev) { |
9564 | rtnl_unlock(); | |
aa8d3a71 | 9565 | return -EINVAL; |
5acc7d3e | 9566 | } |
aa8d3a71 AN |
9567 | |
9568 | link = kzalloc(sizeof(*link), GFP_USER); | |
9569 | if (!link) { | |
9570 | err = -ENOMEM; | |
5acc7d3e | 9571 | goto unlock; |
aa8d3a71 AN |
9572 | } |
9573 | ||
9574 | bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog); | |
9575 | link->dev = dev; | |
9576 | link->flags = attr->link_create.flags; | |
9577 | ||
9578 | err = bpf_link_prime(&link->link, &link_primer); | |
9579 | if (err) { | |
9580 | kfree(link); | |
5acc7d3e | 9581 | goto unlock; |
aa8d3a71 AN |
9582 | } |
9583 | ||
bf4ea1d0 | 9584 | err = dev_xdp_attach_link(dev, &extack, link); |
aa8d3a71 AN |
9585 | rtnl_unlock(); |
9586 | ||
9587 | if (err) { | |
5acc7d3e | 9588 | link->dev = NULL; |
aa8d3a71 | 9589 | bpf_link_cleanup(&link_primer); |
bf4ea1d0 | 9590 | trace_bpf_xdp_link_attach_failed(extack._msg); |
aa8d3a71 AN |
9591 | goto out_put_dev; |
9592 | } | |
9593 | ||
9594 | fd = bpf_link_settle(&link_primer); | |
9595 | /* link itself doesn't hold dev's refcnt to not complicate shutdown */ | |
9596 | dev_put(dev); | |
9597 | return fd; | |
9598 | ||
5acc7d3e XZ |
9599 | unlock: |
9600 | rtnl_unlock(); | |
9601 | ||
aa8d3a71 AN |
9602 | out_put_dev: |
9603 | dev_put(dev); | |
9604 | return err; | |
9605 | } | |
9606 | ||
d4baa936 AN |
9607 | /** |
9608 | * dev_change_xdp_fd - set or clear a bpf program for a device rx path | |
9609 | * @dev: device | |
9610 | * @extack: netlink extended ack | |
9611 | * @fd: new program fd or negative value to clear | |
9612 | * @expected_fd: old program fd that userspace expects to replace or clear | |
9613 | * @flags: xdp-related flags | |
9614 | * | |
9615 | * Set or clear a bpf program for a device | |
9616 | */ | |
9617 | int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, | |
9618 | int fd, int expected_fd, u32 flags) | |
9619 | { | |
c8a36f19 | 9620 | enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags); |
d4baa936 AN |
9621 | struct bpf_prog *new_prog = NULL, *old_prog = NULL; |
9622 | int err; | |
9623 | ||
9624 | ASSERT_RTNL(); | |
9625 | ||
9626 | if (fd >= 0) { | |
9627 | new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, | |
9628 | mode != XDP_MODE_SKB); | |
9629 | if (IS_ERR(new_prog)) | |
9630 | return PTR_ERR(new_prog); | |
9631 | } | |
9632 | ||
9633 | if (expected_fd >= 0) { | |
9634 | old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP, | |
9635 | mode != XDP_MODE_SKB); | |
9636 | if (IS_ERR(old_prog)) { | |
9637 | err = PTR_ERR(old_prog); | |
9638 | old_prog = NULL; | |
9639 | goto err_out; | |
c14a9f63 | 9640 | } |
a7862b45 BB |
9641 | } |
9642 | ||
aa8d3a71 | 9643 | err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags); |
a7862b45 | 9644 | |
d4baa936 AN |
9645 | err_out: |
9646 | if (err && new_prog) | |
9647 | bpf_prog_put(new_prog); | |
9648 | if (old_prog) | |
9649 | bpf_prog_put(old_prog); | |
a7862b45 BB |
9650 | return err; |
9651 | } | |
a7862b45 | 9652 | |
1da177e4 | 9653 | /** |
759ab1ed JK |
9654 | * dev_index_reserve() - allocate an ifindex in a namespace |
9655 | * @net: the applicable net namespace | |
9656 | * @ifindex: requested ifindex, pass %0 to get one allocated | |
9657 | * | |
9658 | * Allocate a ifindex for a new device. Caller must either use the ifindex | |
9659 | * to store the device (via list_netdevice()) or call dev_index_release() | |
9660 | * to give the index up. | |
1da177e4 | 9661 | * |
759ab1ed | 9662 | * Return: a suitable unique value for a new device interface number or -errno. |
1da177e4 | 9663 | */ |
759ab1ed | 9664 | static int dev_index_reserve(struct net *net, u32 ifindex) |
1da177e4 | 9665 | { |
759ab1ed | 9666 | int err; |
f4563a75 | 9667 | |
956db0a1 JK |
9668 | if (ifindex > INT_MAX) { |
9669 | DEBUG_NET_WARN_ON_ONCE(1); | |
9670 | return -EINVAL; | |
9671 | } | |
9672 | ||
759ab1ed JK |
9673 | if (!ifindex) |
9674 | err = xa_alloc_cyclic(&net->dev_by_index, &ifindex, NULL, | |
9675 | xa_limit_31b, &net->ifindex, GFP_KERNEL); | |
9676 | else | |
9677 | err = xa_insert(&net->dev_by_index, ifindex, NULL, GFP_KERNEL); | |
9678 | if (err < 0) | |
9679 | return err; | |
9680 | ||
9681 | return ifindex; | |
9682 | } | |
9683 | ||
9684 | static void dev_index_release(struct net *net, int ifindex) | |
9685 | { | |
9686 | /* Expect only unused indexes, unlist_netdevice() removes the used */ | |
9687 | WARN_ON(xa_erase(&net->dev_by_index, ifindex)); | |
1da177e4 LT |
9688 | } |
9689 | ||
1da177e4 | 9690 | /* Delayed registration/unregisteration */ |
0b5c21bb | 9691 | LIST_HEAD(net_todo_list); |
200b916f | 9692 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 9693 | |
6f05f629 | 9694 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 9695 | { |
1da177e4 | 9696 | list_add_tail(&dev->todo_list, &net_todo_list); |
ede6c39c | 9697 | atomic_inc(&dev_net(dev)->dev_unreg_count); |
1da177e4 LT |
9698 | } |
9699 | ||
fd867d51 JW |
9700 | static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
9701 | struct net_device *upper, netdev_features_t features) | |
9702 | { | |
9703 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
9704 | netdev_features_t feature; | |
5ba3f7d6 | 9705 | int feature_bit; |
fd867d51 | 9706 | |
3b89ea9c | 9707 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 9708 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
9709 | if (!(upper->wanted_features & feature) |
9710 | && (features & feature)) { | |
9711 | netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", | |
9712 | &feature, upper->name); | |
9713 | features &= ~feature; | |
9714 | } | |
9715 | } | |
9716 | ||
9717 | return features; | |
9718 | } | |
9719 | ||
9720 | static void netdev_sync_lower_features(struct net_device *upper, | |
9721 | struct net_device *lower, netdev_features_t features) | |
9722 | { | |
9723 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
9724 | netdev_features_t feature; | |
5ba3f7d6 | 9725 | int feature_bit; |
fd867d51 | 9726 | |
3b89ea9c | 9727 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 9728 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
9729 | if (!(features & feature) && (lower->features & feature)) { |
9730 | netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", | |
9731 | &feature, lower->name); | |
9732 | lower->wanted_features &= ~feature; | |
dd912306 | 9733 | __netdev_update_features(lower); |
fd867d51 JW |
9734 | |
9735 | if (unlikely(lower->features & feature)) | |
9736 | netdev_WARN(upper, "failed to disable %pNF on %s!\n", | |
9737 | &feature, lower->name); | |
dd912306 CW |
9738 | else |
9739 | netdev_features_change(lower); | |
fd867d51 JW |
9740 | } |
9741 | } | |
9742 | } | |
9743 | ||
c8f44aff MM |
9744 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
9745 | netdev_features_t features) | |
b63365a2 | 9746 | { |
57422dc5 MM |
9747 | /* Fix illegal checksum combinations */ |
9748 | if ((features & NETIF_F_HW_CSUM) && | |
9749 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 9750 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
9751 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
9752 | } | |
9753 | ||
b63365a2 | 9754 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 9755 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 9756 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 9757 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
9758 | } |
9759 | ||
ec5f0615 PS |
9760 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
9761 | !(features & NETIF_F_IP_CSUM)) { | |
9762 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
9763 | features &= ~NETIF_F_TSO; | |
9764 | features &= ~NETIF_F_TSO_ECN; | |
9765 | } | |
9766 | ||
9767 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
9768 | !(features & NETIF_F_IPV6_CSUM)) { | |
9769 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
9770 | features &= ~NETIF_F_TSO6; | |
9771 | } | |
9772 | ||
b1dc497b AD |
9773 | /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
9774 | if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) | |
9775 | features &= ~NETIF_F_TSO_MANGLEID; | |
9776 | ||
31d8b9e0 BH |
9777 | /* TSO ECN requires that TSO is present as well. */ |
9778 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
9779 | features &= ~NETIF_F_TSO_ECN; | |
9780 | ||
212b573f MM |
9781 | /* Software GSO depends on SG. */ |
9782 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 9783 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
9784 | features &= ~NETIF_F_GSO; |
9785 | } | |
9786 | ||
802ab55a AD |
9787 | /* GSO partial features require GSO partial be set */ |
9788 | if ((features & dev->gso_partial_features) && | |
9789 | !(features & NETIF_F_GSO_PARTIAL)) { | |
9790 | netdev_dbg(dev, | |
9791 | "Dropping partially supported GSO features since no GSO partial.\n"); | |
9792 | features &= ~dev->gso_partial_features; | |
9793 | } | |
9794 | ||
fb1f5f79 MC |
9795 | if (!(features & NETIF_F_RXCSUM)) { |
9796 | /* NETIF_F_GRO_HW implies doing RXCSUM since every packet | |
9797 | * successfully merged by hardware must also have the | |
9798 | * checksum verified by hardware. If the user does not | |
9799 | * want to enable RXCSUM, logically, we should disable GRO_HW. | |
9800 | */ | |
9801 | if (features & NETIF_F_GRO_HW) { | |
9802 | netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); | |
9803 | features &= ~NETIF_F_GRO_HW; | |
9804 | } | |
9805 | } | |
9806 | ||
de8d5ab2 GP |
9807 | /* LRO/HW-GRO features cannot be combined with RX-FCS */ |
9808 | if (features & NETIF_F_RXFCS) { | |
9809 | if (features & NETIF_F_LRO) { | |
9810 | netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); | |
9811 | features &= ~NETIF_F_LRO; | |
9812 | } | |
9813 | ||
9814 | if (features & NETIF_F_GRO_HW) { | |
9815 | netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); | |
9816 | features &= ~NETIF_F_GRO_HW; | |
9817 | } | |
e6c6a929 GP |
9818 | } |
9819 | ||
54b2b3ec BB |
9820 | if ((features & NETIF_F_GRO_HW) && (features & NETIF_F_LRO)) { |
9821 | netdev_dbg(dev, "Dropping LRO feature since HW-GRO is requested.\n"); | |
9822 | features &= ~NETIF_F_LRO; | |
9823 | } | |
9824 | ||
25537d71 TT |
9825 | if (features & NETIF_F_HW_TLS_TX) { |
9826 | bool ip_csum = (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) == | |
9827 | (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); | |
9828 | bool hw_csum = features & NETIF_F_HW_CSUM; | |
9829 | ||
9830 | if (!ip_csum && !hw_csum) { | |
9831 | netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n"); | |
9832 | features &= ~NETIF_F_HW_TLS_TX; | |
9833 | } | |
ae0b04b2 TT |
9834 | } |
9835 | ||
a3eb4e9d TT |
9836 | if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) { |
9837 | netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n"); | |
9838 | features &= ~NETIF_F_HW_TLS_RX; | |
9839 | } | |
9840 | ||
b63365a2 HX |
9841 | return features; |
9842 | } | |
b63365a2 | 9843 | |
6cb6a27c | 9844 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 9845 | { |
fd867d51 | 9846 | struct net_device *upper, *lower; |
c8f44aff | 9847 | netdev_features_t features; |
fd867d51 | 9848 | struct list_head *iter; |
e7868a85 | 9849 | int err = -1; |
5455c699 | 9850 | |
87267485 MM |
9851 | ASSERT_RTNL(); |
9852 | ||
5455c699 MM |
9853 | features = netdev_get_wanted_features(dev); |
9854 | ||
9855 | if (dev->netdev_ops->ndo_fix_features) | |
9856 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
9857 | ||
9858 | /* driver might be less strict about feature dependencies */ | |
9859 | features = netdev_fix_features(dev, features); | |
9860 | ||
4250b75b | 9861 | /* some features can't be enabled if they're off on an upper device */ |
fd867d51 JW |
9862 | netdev_for_each_upper_dev_rcu(dev, upper, iter) |
9863 | features = netdev_sync_upper_features(dev, upper, features); | |
9864 | ||
5455c699 | 9865 | if (dev->features == features) |
e7868a85 | 9866 | goto sync_lower; |
5455c699 | 9867 | |
c8f44aff MM |
9868 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
9869 | &dev->features, &features); | |
5455c699 MM |
9870 | |
9871 | if (dev->netdev_ops->ndo_set_features) | |
9872 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5f8dc33e NA |
9873 | else |
9874 | err = 0; | |
5455c699 | 9875 | |
6cb6a27c | 9876 | if (unlikely(err < 0)) { |
5455c699 | 9877 | netdev_err(dev, |
c8f44aff MM |
9878 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
9879 | err, &features, &dev->features); | |
17b85d29 NA |
9880 | /* return non-0 since some features might have changed and |
9881 | * it's better to fire a spurious notification than miss it | |
9882 | */ | |
9883 | return -1; | |
6cb6a27c MM |
9884 | } |
9885 | ||
e7868a85 | 9886 | sync_lower: |
fd867d51 JW |
9887 | /* some features must be disabled on lower devices when disabled |
9888 | * on an upper device (think: bonding master or bridge) | |
9889 | */ | |
9890 | netdev_for_each_lower_dev(dev, lower, iter) | |
9891 | netdev_sync_lower_features(dev, lower, features); | |
9892 | ||
ae847f40 SD |
9893 | if (!err) { |
9894 | netdev_features_t diff = features ^ dev->features; | |
9895 | ||
9896 | if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
9897 | /* udp_tunnel_{get,drop}_rx_info both need | |
9898 | * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the | |
9899 | * device, or they won't do anything. | |
9900 | * Thus we need to update dev->features | |
9901 | * *before* calling udp_tunnel_get_rx_info, | |
9902 | * but *after* calling udp_tunnel_drop_rx_info. | |
9903 | */ | |
9904 | if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
9905 | dev->features = features; | |
9906 | udp_tunnel_get_rx_info(dev); | |
9907 | } else { | |
9908 | udp_tunnel_drop_rx_info(dev); | |
9909 | } | |
9910 | } | |
9911 | ||
9daae9bd GP |
9912 | if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { |
9913 | if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
9914 | dev->features = features; | |
9915 | err |= vlan_get_rx_ctag_filter_info(dev); | |
9916 | } else { | |
9917 | vlan_drop_rx_ctag_filter_info(dev); | |
9918 | } | |
9919 | } | |
9920 | ||
9921 | if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { | |
9922 | if (features & NETIF_F_HW_VLAN_STAG_FILTER) { | |
9923 | dev->features = features; | |
9924 | err |= vlan_get_rx_stag_filter_info(dev); | |
9925 | } else { | |
9926 | vlan_drop_rx_stag_filter_info(dev); | |
9927 | } | |
9928 | } | |
9929 | ||
6cb6a27c | 9930 | dev->features = features; |
ae847f40 | 9931 | } |
6cb6a27c | 9932 | |
e7868a85 | 9933 | return err < 0 ? 0 : 1; |
6cb6a27c MM |
9934 | } |
9935 | ||
afe12cc8 MM |
9936 | /** |
9937 | * netdev_update_features - recalculate device features | |
9938 | * @dev: the device to check | |
9939 | * | |
9940 | * Recalculate dev->features set and send notifications if it | |
9941 | * has changed. Should be called after driver or hardware dependent | |
9942 | * conditions might have changed that influence the features. | |
9943 | */ | |
6cb6a27c MM |
9944 | void netdev_update_features(struct net_device *dev) |
9945 | { | |
9946 | if (__netdev_update_features(dev)) | |
9947 | netdev_features_change(dev); | |
5455c699 MM |
9948 | } |
9949 | EXPORT_SYMBOL(netdev_update_features); | |
9950 | ||
afe12cc8 MM |
9951 | /** |
9952 | * netdev_change_features - recalculate device features | |
9953 | * @dev: the device to check | |
9954 | * | |
9955 | * Recalculate dev->features set and send notifications even | |
9956 | * if they have not changed. Should be called instead of | |
9957 | * netdev_update_features() if also dev->vlan_features might | |
9958 | * have changed to allow the changes to be propagated to stacked | |
9959 | * VLAN devices. | |
9960 | */ | |
9961 | void netdev_change_features(struct net_device *dev) | |
9962 | { | |
9963 | __netdev_update_features(dev); | |
9964 | netdev_features_change(dev); | |
9965 | } | |
9966 | EXPORT_SYMBOL(netdev_change_features); | |
9967 | ||
fc4a7489 PM |
9968 | /** |
9969 | * netif_stacked_transfer_operstate - transfer operstate | |
9970 | * @rootdev: the root or lower level device to transfer state from | |
9971 | * @dev: the device to transfer operstate to | |
9972 | * | |
9973 | * Transfer operational state from root to device. This is normally | |
9974 | * called when a stacking relationship exists between the root | |
9975 | * device and the device(a leaf device). | |
9976 | */ | |
9977 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
9978 | struct net_device *dev) | |
9979 | { | |
9980 | if (rootdev->operstate == IF_OPER_DORMANT) | |
9981 | netif_dormant_on(dev); | |
9982 | else | |
9983 | netif_dormant_off(dev); | |
9984 | ||
eec517cd AL |
9985 | if (rootdev->operstate == IF_OPER_TESTING) |
9986 | netif_testing_on(dev); | |
9987 | else | |
9988 | netif_testing_off(dev); | |
9989 | ||
0575c86b ZS |
9990 | if (netif_carrier_ok(rootdev)) |
9991 | netif_carrier_on(dev); | |
9992 | else | |
9993 | netif_carrier_off(dev); | |
fc4a7489 PM |
9994 | } |
9995 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
9996 | ||
1b4bf461 ED |
9997 | static int netif_alloc_rx_queues(struct net_device *dev) |
9998 | { | |
1b4bf461 | 9999 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 10000 | struct netdev_rx_queue *rx; |
10595902 | 10001 | size_t sz = count * sizeof(*rx); |
e817f856 | 10002 | int err = 0; |
1b4bf461 | 10003 | |
bd25fa7b | 10004 | BUG_ON(count < 1); |
1b4bf461 | 10005 | |
c948f51c | 10006 | rx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
10007 | if (!rx) |
10008 | return -ENOMEM; | |
10009 | ||
bd25fa7b TH |
10010 | dev->_rx = rx; |
10011 | ||
e817f856 | 10012 | for (i = 0; i < count; i++) { |
fe822240 | 10013 | rx[i].dev = dev; |
e817f856 JDB |
10014 | |
10015 | /* XDP RX-queue setup */ | |
b02e5a0e | 10016 | err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0); |
e817f856 JDB |
10017 | if (err < 0) |
10018 | goto err_rxq_info; | |
10019 | } | |
1b4bf461 | 10020 | return 0; |
e817f856 JDB |
10021 | |
10022 | err_rxq_info: | |
10023 | /* Rollback successful reg's and free other resources */ | |
10024 | while (i--) | |
10025 | xdp_rxq_info_unreg(&rx[i].xdp_rxq); | |
141b52a9 | 10026 | kvfree(dev->_rx); |
e817f856 JDB |
10027 | dev->_rx = NULL; |
10028 | return err; | |
10029 | } | |
10030 | ||
10031 | static void netif_free_rx_queues(struct net_device *dev) | |
10032 | { | |
10033 | unsigned int i, count = dev->num_rx_queues; | |
e817f856 JDB |
10034 | |
10035 | /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ | |
10036 | if (!dev->_rx) | |
10037 | return; | |
10038 | ||
e817f856 | 10039 | for (i = 0; i < count; i++) |
82aaff2f JK |
10040 | xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq); |
10041 | ||
10042 | kvfree(dev->_rx); | |
1b4bf461 ED |
10043 | } |
10044 | ||
aa942104 CG |
10045 | static void netdev_init_one_queue(struct net_device *dev, |
10046 | struct netdev_queue *queue, void *_unused) | |
10047 | { | |
10048 | /* Initialize queue lock */ | |
10049 | spin_lock_init(&queue->_xmit_lock); | |
1a33e10e | 10050 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); |
aa942104 | 10051 | queue->xmit_lock_owner = -1; |
b236da69 | 10052 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 10053 | queue->dev = dev; |
114cf580 TH |
10054 | #ifdef CONFIG_BQL |
10055 | dql_init(&queue->dql, HZ); | |
10056 | #endif | |
aa942104 CG |
10057 | } |
10058 | ||
60877a32 ED |
10059 | static void netif_free_tx_queues(struct net_device *dev) |
10060 | { | |
4cb28970 | 10061 | kvfree(dev->_tx); |
60877a32 ED |
10062 | } |
10063 | ||
e6484930 TH |
10064 | static int netif_alloc_netdev_queues(struct net_device *dev) |
10065 | { | |
10066 | unsigned int count = dev->num_tx_queues; | |
10067 | struct netdev_queue *tx; | |
60877a32 | 10068 | size_t sz = count * sizeof(*tx); |
e6484930 | 10069 | |
d339727c ED |
10070 | if (count < 1 || count > 0xffff) |
10071 | return -EINVAL; | |
62b5942a | 10072 | |
c948f51c | 10073 | tx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
10074 | if (!tx) |
10075 | return -ENOMEM; | |
10076 | ||
e6484930 | 10077 | dev->_tx = tx; |
1d24eb48 | 10078 | |
e6484930 TH |
10079 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
10080 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
10081 | |
10082 | return 0; | |
e6484930 TH |
10083 | } |
10084 | ||
a2029240 DV |
10085 | void netif_tx_stop_all_queues(struct net_device *dev) |
10086 | { | |
10087 | unsigned int i; | |
10088 | ||
10089 | for (i = 0; i < dev->num_tx_queues; i++) { | |
10090 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f4563a75 | 10091 | |
a2029240 DV |
10092 | netif_tx_stop_queue(txq); |
10093 | } | |
10094 | } | |
10095 | EXPORT_SYMBOL(netif_tx_stop_all_queues); | |
10096 | ||
34d21de9 DB |
10097 | static int netdev_do_alloc_pcpu_stats(struct net_device *dev) |
10098 | { | |
10099 | void __percpu *v; | |
10100 | ||
024ee930 PY |
10101 | /* Drivers implementing ndo_get_peer_dev must support tstat |
10102 | * accounting, so that skb_do_redirect() can bump the dev's | |
10103 | * RX stats upon network namespace switch. | |
10104 | */ | |
10105 | if (dev->netdev_ops->ndo_get_peer_dev && | |
10106 | dev->pcpu_stat_type != NETDEV_PCPU_STAT_TSTATS) | |
10107 | return -EOPNOTSUPP; | |
10108 | ||
34d21de9 DB |
10109 | switch (dev->pcpu_stat_type) { |
10110 | case NETDEV_PCPU_STAT_NONE: | |
10111 | return 0; | |
10112 | case NETDEV_PCPU_STAT_LSTATS: | |
10113 | v = dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); | |
10114 | break; | |
10115 | case NETDEV_PCPU_STAT_TSTATS: | |
10116 | v = dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
10117 | break; | |
10118 | case NETDEV_PCPU_STAT_DSTATS: | |
10119 | v = dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats); | |
10120 | break; | |
10121 | default: | |
10122 | return -EINVAL; | |
10123 | } | |
10124 | ||
10125 | return v ? 0 : -ENOMEM; | |
10126 | } | |
10127 | ||
10128 | static void netdev_do_free_pcpu_stats(struct net_device *dev) | |
10129 | { | |
10130 | switch (dev->pcpu_stat_type) { | |
10131 | case NETDEV_PCPU_STAT_NONE: | |
10132 | return; | |
10133 | case NETDEV_PCPU_STAT_LSTATS: | |
10134 | free_percpu(dev->lstats); | |
10135 | break; | |
10136 | case NETDEV_PCPU_STAT_TSTATS: | |
10137 | free_percpu(dev->tstats); | |
10138 | break; | |
10139 | case NETDEV_PCPU_STAT_DSTATS: | |
10140 | free_percpu(dev->dstats); | |
10141 | break; | |
10142 | } | |
10143 | } | |
10144 | ||
1da177e4 | 10145 | /** |
fa926bb3 JK |
10146 | * register_netdevice() - register a network device |
10147 | * @dev: device to register | |
1da177e4 | 10148 | * |
fa926bb3 JK |
10149 | * Take a prepared network device structure and make it externally accessible. |
10150 | * A %NETDEV_REGISTER message is sent to the netdev notifier chain. | |
10151 | * Callers must hold the rtnl lock - you may want register_netdev() | |
10152 | * instead of this. | |
1da177e4 | 10153 | */ |
1da177e4 LT |
10154 | int register_netdevice(struct net_device *dev) |
10155 | { | |
1da177e4 | 10156 | int ret; |
d314774c | 10157 | struct net *net = dev_net(dev); |
1da177e4 | 10158 | |
e283de3a FF |
10159 | BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < |
10160 | NETDEV_FEATURE_COUNT); | |
1da177e4 LT |
10161 | BUG_ON(dev_boot_phase); |
10162 | ASSERT_RTNL(); | |
10163 | ||
b17a7c17 SH |
10164 | might_sleep(); |
10165 | ||
1da177e4 LT |
10166 | /* When net_device's are persistent, this will be fatal. */ |
10167 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 10168 | BUG_ON(!net); |
1da177e4 | 10169 | |
9000edb7 JK |
10170 | ret = ethtool_check_ops(dev->ethtool_ops); |
10171 | if (ret) | |
10172 | return ret; | |
10173 | ||
f1f28aa3 | 10174 | spin_lock_init(&dev->addr_list_lock); |
845e0ebb | 10175 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 10176 | |
828de4f6 | 10177 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
10178 | if (ret < 0) |
10179 | goto out; | |
10180 | ||
9077f052 | 10181 | ret = -ENOMEM; |
ff927412 JP |
10182 | dev->name_node = netdev_name_node_head_alloc(dev); |
10183 | if (!dev->name_node) | |
10184 | goto out; | |
10185 | ||
1da177e4 | 10186 | /* Init, if this function is available */ |
d314774c SH |
10187 | if (dev->netdev_ops->ndo_init) { |
10188 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
10189 | if (ret) { |
10190 | if (ret > 0) | |
10191 | ret = -EIO; | |
42c17fa6 | 10192 | goto err_free_name; |
1da177e4 LT |
10193 | } |
10194 | } | |
4ec93edb | 10195 | |
f646968f PM |
10196 | if (((dev->hw_features | dev->features) & |
10197 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
10198 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
10199 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
10200 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
10201 | ret = -EINVAL; | |
10202 | goto err_uninit; | |
10203 | } | |
10204 | ||
34d21de9 DB |
10205 | ret = netdev_do_alloc_pcpu_stats(dev); |
10206 | if (ret) | |
10207 | goto err_uninit; | |
10208 | ||
759ab1ed JK |
10209 | ret = dev_index_reserve(net, dev->ifindex); |
10210 | if (ret < 0) | |
34d21de9 | 10211 | goto err_free_pcpu; |
759ab1ed | 10212 | dev->ifindex = ret; |
9c7dafbf | 10213 | |
5455c699 MM |
10214 | /* Transfer changeable features to wanted_features and enable |
10215 | * software offloads (GSO and GRO). | |
10216 | */ | |
1a3c998f | 10217 | dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF); |
14d1232f | 10218 | dev->features |= NETIF_F_SOFT_FEATURES; |
d764a122 | 10219 | |
876c4384 | 10220 | if (dev->udp_tunnel_nic_info) { |
d764a122 SD |
10221 | dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; |
10222 | dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
10223 | } | |
10224 | ||
14d1232f | 10225 | dev->wanted_features = dev->features & dev->hw_features; |
1da177e4 | 10226 | |
cbc53e08 | 10227 | if (!(dev->flags & IFF_LOOPBACK)) |
34324dc2 | 10228 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
cbc53e08 | 10229 | |
7f348a60 AD |
10230 | /* If IPv4 TCP segmentation offload is supported we should also |
10231 | * allow the device to enable segmenting the frame with the option | |
10232 | * of ignoring a static IP ID value. This doesn't enable the | |
10233 | * feature itself but allows the user to enable it later. | |
10234 | */ | |
cbc53e08 AD |
10235 | if (dev->hw_features & NETIF_F_TSO) |
10236 | dev->hw_features |= NETIF_F_TSO_MANGLEID; | |
7f348a60 AD |
10237 | if (dev->vlan_features & NETIF_F_TSO) |
10238 | dev->vlan_features |= NETIF_F_TSO_MANGLEID; | |
10239 | if (dev->mpls_features & NETIF_F_TSO) | |
10240 | dev->mpls_features |= NETIF_F_TSO_MANGLEID; | |
10241 | if (dev->hw_enc_features & NETIF_F_TSO) | |
10242 | dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; | |
c6e1a0d1 | 10243 | |
1180e7d6 | 10244 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 10245 | */ |
1180e7d6 | 10246 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 10247 | |
ee579677 PS |
10248 | /* Make NETIF_F_SG inheritable to tunnel devices. |
10249 | */ | |
802ab55a | 10250 | dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
ee579677 | 10251 | |
0d89d203 SH |
10252 | /* Make NETIF_F_SG inheritable to MPLS. |
10253 | */ | |
10254 | dev->mpls_features |= NETIF_F_SG; | |
10255 | ||
7ffbe3fd JB |
10256 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
10257 | ret = notifier_to_errno(ret); | |
10258 | if (ret) | |
759ab1ed | 10259 | goto err_ifindex_release; |
7ffbe3fd | 10260 | |
8b41d188 | 10261 | ret = netdev_register_kobject(dev); |
cc26c266 ED |
10262 | write_lock(&dev_base_lock); |
10263 | dev->reg_state = ret ? NETREG_UNREGISTERED : NETREG_REGISTERED; | |
10264 | write_unlock(&dev_base_lock); | |
10265 | if (ret) | |
02a68a47 | 10266 | goto err_uninit_notify; |
b17a7c17 | 10267 | |
6cb6a27c | 10268 | __netdev_update_features(dev); |
8e9b59b2 | 10269 | |
1da177e4 LT |
10270 | /* |
10271 | * Default initial state at registry is that the | |
10272 | * device is present. | |
10273 | */ | |
10274 | ||
10275 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
10276 | ||
8f4cccbb BH |
10277 | linkwatch_init_dev(dev); |
10278 | ||
1da177e4 | 10279 | dev_init_scheduler(dev); |
b2309a71 | 10280 | |
d62607c3 | 10281 | netdev_hold(dev, &dev->dev_registered_tracker, GFP_KERNEL); |
ce286d32 | 10282 | list_netdevice(dev); |
b2309a71 | 10283 | |
7bf23575 | 10284 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 10285 | |
948b337e JP |
10286 | /* If the device has permanent device address, driver should |
10287 | * set dev_addr and also addr_assign_type should be set to | |
10288 | * NET_ADDR_PERM (default value). | |
10289 | */ | |
10290 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
10291 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
10292 | ||
1da177e4 | 10293 | /* Notify protocols, that a new device appeared. */ |
056925ab | 10294 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 10295 | ret = notifier_to_errno(ret); |
93ee31f1 | 10296 | if (ret) { |
766b0515 JK |
10297 | /* Expect explicit free_netdev() on failure */ |
10298 | dev->needs_free_netdev = false; | |
037e56bd | 10299 | unregister_netdevice_queue(dev, NULL); |
766b0515 | 10300 | goto out; |
93ee31f1 | 10301 | } |
d90a909e EB |
10302 | /* |
10303 | * Prevent userspace races by waiting until the network | |
10304 | * device is fully setup before sending notifications. | |
10305 | */ | |
a2835763 PM |
10306 | if (!dev->rtnl_link_ops || |
10307 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
1d997f10 | 10308 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL); |
1da177e4 LT |
10309 | |
10310 | out: | |
10311 | return ret; | |
7ce1b0ed | 10312 | |
02a68a47 JP |
10313 | err_uninit_notify: |
10314 | call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev); | |
759ab1ed JK |
10315 | err_ifindex_release: |
10316 | dev_index_release(net, dev->ifindex); | |
34d21de9 DB |
10317 | err_free_pcpu: |
10318 | netdev_do_free_pcpu_stats(dev); | |
7ce1b0ed | 10319 | err_uninit: |
d314774c SH |
10320 | if (dev->netdev_ops->ndo_uninit) |
10321 | dev->netdev_ops->ndo_uninit(dev); | |
cf124db5 DM |
10322 | if (dev->priv_destructor) |
10323 | dev->priv_destructor(dev); | |
42c17fa6 DC |
10324 | err_free_name: |
10325 | netdev_name_node_free(dev->name_node); | |
7ce1b0ed | 10326 | goto out; |
1da177e4 | 10327 | } |
d1b19dff | 10328 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 10329 | |
937f1ba5 BH |
10330 | /** |
10331 | * init_dummy_netdev - init a dummy network device for NAPI | |
10332 | * @dev: device to init | |
10333 | * | |
10334 | * This takes a network device structure and initialize the minimum | |
10335 | * amount of fields so it can be used to schedule NAPI polls without | |
10336 | * registering a full blown interface. This is to be used by drivers | |
10337 | * that need to tie several hardware interfaces to a single NAPI | |
10338 | * poll scheduler due to HW limitations. | |
10339 | */ | |
10340 | int init_dummy_netdev(struct net_device *dev) | |
10341 | { | |
10342 | /* Clear everything. Note we don't initialize spinlocks | |
10343 | * are they aren't supposed to be taken by any of the | |
10344 | * NAPI code and this dummy netdev is supposed to be | |
10345 | * only ever used for NAPI polls | |
10346 | */ | |
10347 | memset(dev, 0, sizeof(struct net_device)); | |
10348 | ||
10349 | /* make sure we BUG if trying to hit standard | |
10350 | * register/unregister code path | |
10351 | */ | |
10352 | dev->reg_state = NETREG_DUMMY; | |
10353 | ||
937f1ba5 BH |
10354 | /* NAPI wants this */ |
10355 | INIT_LIST_HEAD(&dev->napi_list); | |
10356 | ||
10357 | /* a dummy interface is started by default */ | |
10358 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
10359 | set_bit(__LINK_STATE_START, &dev->state); | |
10360 | ||
35edfdc7 JE |
10361 | /* napi_busy_loop stats accounting wants this */ |
10362 | dev_net_set(dev, &init_net); | |
10363 | ||
29b4433d ED |
10364 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
10365 | * because users of this 'device' dont need to change | |
10366 | * its refcount. | |
10367 | */ | |
10368 | ||
937f1ba5 BH |
10369 | return 0; |
10370 | } | |
10371 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
10372 | ||
10373 | ||
1da177e4 LT |
10374 | /** |
10375 | * register_netdev - register a network device | |
10376 | * @dev: device to register | |
10377 | * | |
10378 | * Take a completed network device structure and add it to the kernel | |
10379 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
10380 | * chain. 0 is returned on success. A negative errno code is returned | |
10381 | * on a failure to set up the device, or if the name is a duplicate. | |
10382 | * | |
38b4da38 | 10383 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
10384 | * and expands the device name if you passed a format string to |
10385 | * alloc_netdev. | |
10386 | */ | |
10387 | int register_netdev(struct net_device *dev) | |
10388 | { | |
10389 | int err; | |
10390 | ||
b0f3debc KT |
10391 | if (rtnl_lock_killable()) |
10392 | return -EINTR; | |
1da177e4 | 10393 | err = register_netdevice(dev); |
1da177e4 LT |
10394 | rtnl_unlock(); |
10395 | return err; | |
10396 | } | |
10397 | EXPORT_SYMBOL(register_netdev); | |
10398 | ||
29b4433d ED |
10399 | int netdev_refcnt_read(const struct net_device *dev) |
10400 | { | |
919067cc | 10401 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d ED |
10402 | int i, refcnt = 0; |
10403 | ||
10404 | for_each_possible_cpu(i) | |
10405 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
10406 | return refcnt; | |
919067cc ED |
10407 | #else |
10408 | return refcount_read(&dev->dev_refcnt); | |
10409 | #endif | |
29b4433d ED |
10410 | } |
10411 | EXPORT_SYMBOL(netdev_refcnt_read); | |
10412 | ||
5aa3afe1 DV |
10413 | int netdev_unregister_timeout_secs __read_mostly = 10; |
10414 | ||
de2b541b MCC |
10415 | #define WAIT_REFS_MIN_MSECS 1 |
10416 | #define WAIT_REFS_MAX_MSECS 250 | |
2c53040f | 10417 | /** |
faab39f6 JK |
10418 | * netdev_wait_allrefs_any - wait until all references are gone. |
10419 | * @list: list of net_devices to wait on | |
1da177e4 LT |
10420 | * |
10421 | * This is called when unregistering network devices. | |
10422 | * | |
10423 | * Any protocol or device that holds a reference should register | |
10424 | * for netdevice notification, and cleanup and put back the | |
10425 | * reference if they receive an UNREGISTER event. | |
10426 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 10427 | * call dev_put. |
1da177e4 | 10428 | */ |
faab39f6 | 10429 | static struct net_device *netdev_wait_allrefs_any(struct list_head *list) |
1da177e4 LT |
10430 | { |
10431 | unsigned long rebroadcast_time, warning_time; | |
faab39f6 JK |
10432 | struct net_device *dev; |
10433 | int wait = 0; | |
1da177e4 LT |
10434 | |
10435 | rebroadcast_time = warning_time = jiffies; | |
29b4433d | 10436 | |
faab39f6 JK |
10437 | list_for_each_entry(dev, list, todo_list) |
10438 | if (netdev_refcnt_read(dev) == 1) | |
10439 | return dev; | |
10440 | ||
10441 | while (true) { | |
1da177e4 | 10442 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 10443 | rtnl_lock(); |
1da177e4 LT |
10444 | |
10445 | /* Rebroadcast unregister notification */ | |
faab39f6 JK |
10446 | list_for_each_entry(dev, list, todo_list) |
10447 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
1da177e4 | 10448 | |
748e2d93 | 10449 | __rtnl_unlock(); |
0115e8e3 | 10450 | rcu_barrier(); |
748e2d93 ED |
10451 | rtnl_lock(); |
10452 | ||
faab39f6 JK |
10453 | list_for_each_entry(dev, list, todo_list) |
10454 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
10455 | &dev->state)) { | |
10456 | /* We must not have linkwatch events | |
10457 | * pending on unregister. If this | |
10458 | * happens, we simply run the queue | |
10459 | * unscheduled, resulting in a noop | |
10460 | * for this device. | |
10461 | */ | |
10462 | linkwatch_run_queue(); | |
10463 | break; | |
10464 | } | |
1da177e4 | 10465 | |
6756ae4b | 10466 | __rtnl_unlock(); |
1da177e4 LT |
10467 | |
10468 | rebroadcast_time = jiffies; | |
10469 | } | |
10470 | ||
0e4be9e5 FR |
10471 | if (!wait) { |
10472 | rcu_barrier(); | |
10473 | wait = WAIT_REFS_MIN_MSECS; | |
10474 | } else { | |
10475 | msleep(wait); | |
10476 | wait = min(wait << 1, WAIT_REFS_MAX_MSECS); | |
10477 | } | |
1da177e4 | 10478 | |
faab39f6 JK |
10479 | list_for_each_entry(dev, list, todo_list) |
10480 | if (netdev_refcnt_read(dev) == 1) | |
10481 | return dev; | |
29b4433d | 10482 | |
faab39f6 | 10483 | if (time_after(jiffies, warning_time + |
05e49cfc | 10484 | READ_ONCE(netdev_unregister_timeout_secs) * HZ)) { |
faab39f6 JK |
10485 | list_for_each_entry(dev, list, todo_list) { |
10486 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", | |
10487 | dev->name, netdev_refcnt_read(dev)); | |
10488 | ref_tracker_dir_print(&dev->refcnt_tracker, 10); | |
10489 | } | |
10490 | ||
1da177e4 LT |
10491 | warning_time = jiffies; |
10492 | } | |
10493 | } | |
10494 | } | |
10495 | ||
10496 | /* The sequence is: | |
10497 | * | |
10498 | * rtnl_lock(); | |
10499 | * ... | |
10500 | * register_netdevice(x1); | |
10501 | * register_netdevice(x2); | |
10502 | * ... | |
10503 | * unregister_netdevice(y1); | |
10504 | * unregister_netdevice(y2); | |
10505 | * ... | |
10506 | * rtnl_unlock(); | |
10507 | * free_netdev(y1); | |
10508 | * free_netdev(y2); | |
10509 | * | |
58ec3b4d | 10510 | * We are invoked by rtnl_unlock(). |
1da177e4 | 10511 | * This allows us to deal with problems: |
b17a7c17 | 10512 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
10513 | * without deadlocking with linkwatch via keventd. |
10514 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
10515 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
10516 | * |
10517 | * We must not return until all unregister events added during | |
10518 | * the interval the lock was held have been completed. | |
1da177e4 | 10519 | */ |
1da177e4 LT |
10520 | void netdev_run_todo(void) |
10521 | { | |
ae68db14 | 10522 | struct net_device *dev, *tmp; |
626ab0e6 | 10523 | struct list_head list; |
1fc70edb TY |
10524 | #ifdef CONFIG_LOCKDEP |
10525 | struct list_head unlink_list; | |
10526 | ||
10527 | list_replace_init(&net_unlink_list, &unlink_list); | |
10528 | ||
10529 | while (!list_empty(&unlink_list)) { | |
10530 | struct net_device *dev = list_first_entry(&unlink_list, | |
10531 | struct net_device, | |
10532 | unlink_list); | |
0e8b8d6a | 10533 | list_del_init(&dev->unlink_list); |
1fc70edb TY |
10534 | dev->nested_level = dev->lower_level - 1; |
10535 | } | |
10536 | #endif | |
1da177e4 | 10537 | |
1da177e4 | 10538 | /* Snapshot list, allow later requests */ |
626ab0e6 | 10539 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
10540 | |
10541 | __rtnl_unlock(); | |
626ab0e6 | 10542 | |
0115e8e3 | 10543 | /* Wait for rcu callbacks to finish before next phase */ |
850a545b EB |
10544 | if (!list_empty(&list)) |
10545 | rcu_barrier(); | |
10546 | ||
ae68db14 | 10547 | list_for_each_entry_safe(dev, tmp, &list, todo_list) { |
b17a7c17 | 10548 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
ae68db14 JK |
10549 | netdev_WARN(dev, "run_todo but not unregistering\n"); |
10550 | list_del(&dev->todo_list); | |
b17a7c17 SH |
10551 | continue; |
10552 | } | |
1da177e4 | 10553 | |
cc26c266 | 10554 | write_lock(&dev_base_lock); |
b17a7c17 | 10555 | dev->reg_state = NETREG_UNREGISTERED; |
cc26c266 | 10556 | write_unlock(&dev_base_lock); |
facd15df | 10557 | linkwatch_sync_dev(dev); |
ae68db14 JK |
10558 | } |
10559 | ||
10560 | while (!list_empty(&list)) { | |
faab39f6 | 10561 | dev = netdev_wait_allrefs_any(&list); |
ae68db14 | 10562 | list_del(&dev->todo_list); |
1da177e4 | 10563 | |
b17a7c17 | 10564 | /* paranoia */ |
add2d736 | 10565 | BUG_ON(netdev_refcnt_read(dev) != 1); |
7866a621 SN |
10566 | BUG_ON(!list_empty(&dev->ptype_all)); |
10567 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
10568 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
10569 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
1202cdd6 | 10570 | |
34d21de9 | 10571 | netdev_do_free_pcpu_stats(dev); |
cf124db5 DM |
10572 | if (dev->priv_destructor) |
10573 | dev->priv_destructor(dev); | |
10574 | if (dev->needs_free_netdev) | |
10575 | free_netdev(dev); | |
9093bbb2 | 10576 | |
ede6c39c ED |
10577 | if (atomic_dec_and_test(&dev_net(dev)->dev_unreg_count)) |
10578 | wake_up(&netdev_unregistering_wq); | |
50624c93 | 10579 | |
9093bbb2 SH |
10580 | /* Free network device */ |
10581 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 10582 | } |
1da177e4 LT |
10583 | } |
10584 | ||
9256645a JW |
10585 | /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
10586 | * all the same fields in the same order as net_device_stats, with only | |
10587 | * the type differing, but rtnl_link_stats64 may have additional fields | |
10588 | * at the end for newer counters. | |
3cfde79c | 10589 | */ |
77a1abf5 ED |
10590 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
10591 | const struct net_device_stats *netdev_stats) | |
3cfde79c | 10592 | { |
6c1c5097 ED |
10593 | size_t i, n = sizeof(*netdev_stats) / sizeof(atomic_long_t); |
10594 | const atomic_long_t *src = (atomic_long_t *)netdev_stats; | |
3cfde79c BH |
10595 | u64 *dst = (u64 *)stats64; |
10596 | ||
9256645a | 10597 | BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
3cfde79c | 10598 | for (i = 0; i < n; i++) |
9b55d3f0 | 10599 | dst[i] = (unsigned long)atomic_long_read(&src[i]); |
9256645a JW |
10600 | /* zero out counters that only exist in rtnl_link_stats64 */ |
10601 | memset((char *)stats64 + n * sizeof(u64), 0, | |
10602 | sizeof(*stats64) - n * sizeof(u64)); | |
3cfde79c | 10603 | } |
77a1abf5 | 10604 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 10605 | |
5247dbf1 YD |
10606 | static __cold struct net_device_core_stats __percpu *netdev_core_stats_alloc( |
10607 | struct net_device *dev) | |
625788b5 ED |
10608 | { |
10609 | struct net_device_core_stats __percpu *p; | |
10610 | ||
10611 | p = alloc_percpu_gfp(struct net_device_core_stats, | |
10612 | GFP_ATOMIC | __GFP_NOWARN); | |
10613 | ||
10614 | if (p && cmpxchg(&dev->core_stats, NULL, p)) | |
10615 | free_percpu(p); | |
10616 | ||
10617 | /* This READ_ONCE() pairs with the cmpxchg() above */ | |
6510ea97 | 10618 | return READ_ONCE(dev->core_stats); |
625788b5 | 10619 | } |
5247dbf1 YD |
10620 | |
10621 | noinline void netdev_core_stats_inc(struct net_device *dev, u32 offset) | |
10622 | { | |
10623 | /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */ | |
10624 | struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats); | |
10625 | unsigned long __percpu *field; | |
10626 | ||
10627 | if (unlikely(!p)) { | |
10628 | p = netdev_core_stats_alloc(dev); | |
10629 | if (!p) | |
10630 | return; | |
10631 | } | |
10632 | ||
10633 | field = (__force unsigned long __percpu *)((__force void *)p + offset); | |
10634 | this_cpu_inc(*field); | |
10635 | } | |
10636 | EXPORT_SYMBOL_GPL(netdev_core_stats_inc); | |
625788b5 | 10637 | |
eeda3fd6 SH |
10638 | /** |
10639 | * dev_get_stats - get network device statistics | |
10640 | * @dev: device to get statistics from | |
28172739 | 10641 | * @storage: place to store stats |
eeda3fd6 | 10642 | * |
d7753516 BH |
10643 | * Get network statistics from device. Return @storage. |
10644 | * The device driver may provide its own method by setting | |
10645 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
10646 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 10647 | */ |
d7753516 BH |
10648 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
10649 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 10650 | { |
eeda3fd6 | 10651 | const struct net_device_ops *ops = dev->netdev_ops; |
625788b5 | 10652 | const struct net_device_core_stats __percpu *p; |
eeda3fd6 | 10653 | |
28172739 ED |
10654 | if (ops->ndo_get_stats64) { |
10655 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
10656 | ops->ndo_get_stats64(dev, storage); |
10657 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 10658 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
10659 | } else { |
10660 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 10661 | } |
625788b5 ED |
10662 | |
10663 | /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */ | |
10664 | p = READ_ONCE(dev->core_stats); | |
10665 | if (p) { | |
10666 | const struct net_device_core_stats *core_stats; | |
10667 | int i; | |
10668 | ||
10669 | for_each_possible_cpu(i) { | |
10670 | core_stats = per_cpu_ptr(p, i); | |
6510ea97 SAS |
10671 | storage->rx_dropped += READ_ONCE(core_stats->rx_dropped); |
10672 | storage->tx_dropped += READ_ONCE(core_stats->tx_dropped); | |
10673 | storage->rx_nohandler += READ_ONCE(core_stats->rx_nohandler); | |
0e55546b | 10674 | storage->rx_otherhost_dropped += READ_ONCE(core_stats->rx_otherhost_dropped); |
625788b5 ED |
10675 | } |
10676 | } | |
28172739 | 10677 | return storage; |
c45d286e | 10678 | } |
eeda3fd6 | 10679 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 10680 | |
44fa32f0 HK |
10681 | /** |
10682 | * dev_fetch_sw_netstats - get per-cpu network device statistics | |
10683 | * @s: place to store stats | |
10684 | * @netstats: per-cpu network stats to read from | |
10685 | * | |
10686 | * Read per-cpu network statistics and populate the related fields in @s. | |
10687 | */ | |
10688 | void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, | |
10689 | const struct pcpu_sw_netstats __percpu *netstats) | |
10690 | { | |
10691 | int cpu; | |
10692 | ||
10693 | for_each_possible_cpu(cpu) { | |
9962acef | 10694 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
44fa32f0 | 10695 | const struct pcpu_sw_netstats *stats; |
44fa32f0 HK |
10696 | unsigned int start; |
10697 | ||
10698 | stats = per_cpu_ptr(netstats, cpu); | |
10699 | do { | |
d120d1a6 | 10700 | start = u64_stats_fetch_begin(&stats->syncp); |
9962acef ED |
10701 | rx_packets = u64_stats_read(&stats->rx_packets); |
10702 | rx_bytes = u64_stats_read(&stats->rx_bytes); | |
10703 | tx_packets = u64_stats_read(&stats->tx_packets); | |
10704 | tx_bytes = u64_stats_read(&stats->tx_bytes); | |
d120d1a6 | 10705 | } while (u64_stats_fetch_retry(&stats->syncp, start)); |
44fa32f0 | 10706 | |
9962acef ED |
10707 | s->rx_packets += rx_packets; |
10708 | s->rx_bytes += rx_bytes; | |
10709 | s->tx_packets += tx_packets; | |
10710 | s->tx_bytes += tx_bytes; | |
44fa32f0 HK |
10711 | } |
10712 | } | |
10713 | EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats); | |
10714 | ||
a1839426 HK |
10715 | /** |
10716 | * dev_get_tstats64 - ndo_get_stats64 implementation | |
10717 | * @dev: device to get statistics from | |
10718 | * @s: place to store stats | |
10719 | * | |
10720 | * Populate @s from dev->stats and dev->tstats. Can be used as | |
10721 | * ndo_get_stats64() callback. | |
10722 | */ | |
10723 | void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s) | |
10724 | { | |
10725 | netdev_stats_to_stats64(s, &dev->stats); | |
10726 | dev_fetch_sw_netstats(s, dev->tstats); | |
10727 | } | |
10728 | EXPORT_SYMBOL_GPL(dev_get_tstats64); | |
10729 | ||
24824a09 | 10730 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 10731 | { |
24824a09 | 10732 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 10733 | |
24824a09 ED |
10734 | #ifdef CONFIG_NET_CLS_ACT |
10735 | if (queue) | |
10736 | return queue; | |
10737 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
10738 | if (!queue) | |
10739 | return NULL; | |
10740 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 10741 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
d636fc5d | 10742 | RCU_INIT_POINTER(queue->qdisc_sleeping, &noop_qdisc); |
24824a09 ED |
10743 | rcu_assign_pointer(dev->ingress_queue, queue); |
10744 | #endif | |
10745 | return queue; | |
bb949fbd DM |
10746 | } |
10747 | ||
2c60db03 ED |
10748 | static const struct ethtool_ops default_ethtool_ops; |
10749 | ||
d07d7507 SG |
10750 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
10751 | const struct ethtool_ops *ops) | |
10752 | { | |
10753 | if (dev->ethtool_ops == &default_ethtool_ops) | |
10754 | dev->ethtool_ops = ops; | |
10755 | } | |
10756 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
10757 | ||
d9360708 HK |
10758 | /** |
10759 | * netdev_sw_irq_coalesce_default_on() - enable SW IRQ coalescing by default | |
10760 | * @dev: netdev to enable the IRQ coalescing on | |
10761 | * | |
10762 | * Sets a conservative default for SW IRQ coalescing. Users can use | |
10763 | * sysfs attributes to override the default values. | |
10764 | */ | |
10765 | void netdev_sw_irq_coalesce_default_on(struct net_device *dev) | |
10766 | { | |
10767 | WARN_ON(dev->reg_state == NETREG_REGISTERED); | |
10768 | ||
748b4428 HK |
10769 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) { |
10770 | dev->gro_flush_timeout = 20000; | |
10771 | dev->napi_defer_hard_irqs = 1; | |
10772 | } | |
d9360708 HK |
10773 | } |
10774 | EXPORT_SYMBOL_GPL(netdev_sw_irq_coalesce_default_on); | |
10775 | ||
74d332c1 ED |
10776 | void netdev_freemem(struct net_device *dev) |
10777 | { | |
10778 | char *addr = (char *)dev - dev->padded; | |
10779 | ||
4cb28970 | 10780 | kvfree(addr); |
74d332c1 ED |
10781 | } |
10782 | ||
1da177e4 | 10783 | /** |
722c9a0c | 10784 | * alloc_netdev_mqs - allocate network device |
10785 | * @sizeof_priv: size of private data to allocate space for | |
10786 | * @name: device name format string | |
10787 | * @name_assign_type: origin of device name | |
10788 | * @setup: callback to initialize device | |
10789 | * @txqs: the number of TX subqueues to allocate | |
10790 | * @rxqs: the number of RX subqueues to allocate | |
10791 | * | |
10792 | * Allocates a struct net_device with private data area for driver use | |
10793 | * and performs basic initialization. Also allocates subqueue structs | |
10794 | * for each queue on the device. | |
1da177e4 | 10795 | */ |
36909ea4 | 10796 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 10797 | unsigned char name_assign_type, |
36909ea4 TH |
10798 | void (*setup)(struct net_device *), |
10799 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 10800 | { |
1da177e4 | 10801 | struct net_device *dev; |
52a59bd5 | 10802 | unsigned int alloc_size; |
1ce8e7b5 | 10803 | struct net_device *p; |
1da177e4 | 10804 | |
b6fe17d6 SH |
10805 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
10806 | ||
36909ea4 | 10807 | if (txqs < 1) { |
7b6cd1ce | 10808 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
10809 | return NULL; |
10810 | } | |
10811 | ||
36909ea4 | 10812 | if (rxqs < 1) { |
7b6cd1ce | 10813 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
10814 | return NULL; |
10815 | } | |
36909ea4 | 10816 | |
fd2ea0a7 | 10817 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
10818 | if (sizeof_priv) { |
10819 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 10820 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
10821 | alloc_size += sizeof_priv; |
10822 | } | |
10823 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 10824 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 10825 | |
c948f51c | 10826 | p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
62b5942a | 10827 | if (!p) |
1da177e4 | 10828 | return NULL; |
1da177e4 | 10829 | |
1ce8e7b5 | 10830 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 10831 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 10832 | |
b6d7c0eb | 10833 | ref_tracker_dir_init(&dev->refcnt_tracker, 128, name); |
919067cc | 10834 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d ED |
10835 | dev->pcpu_refcnt = alloc_percpu(int); |
10836 | if (!dev->pcpu_refcnt) | |
74d332c1 | 10837 | goto free_dev; |
4c6c11ea | 10838 | __dev_hold(dev); |
add2d736 ED |
10839 | #else |
10840 | refcount_set(&dev->dev_refcnt, 1); | |
919067cc | 10841 | #endif |
ab9c73cc | 10842 | |
ab9c73cc | 10843 | if (dev_addr_init(dev)) |
29b4433d | 10844 | goto free_pcpu; |
ab9c73cc | 10845 | |
22bedad3 | 10846 | dev_mc_init(dev); |
a748ee24 | 10847 | dev_uc_init(dev); |
ccffad25 | 10848 | |
c346dca1 | 10849 | dev_net_set(dev, &init_net); |
1da177e4 | 10850 | |
7c4e983c | 10851 | dev->gso_max_size = GSO_LEGACY_MAX_SIZE; |
13ce2daa | 10852 | dev->xdp_zc_max_segs = 1; |
30b678d8 | 10853 | dev->gso_max_segs = GSO_MAX_SEGS; |
0fe79f28 | 10854 | dev->gro_max_size = GRO_LEGACY_MAX_SIZE; |
9eefedd5 XL |
10855 | dev->gso_ipv4_max_size = GSO_LEGACY_MAX_SIZE; |
10856 | dev->gro_ipv4_max_size = GRO_LEGACY_MAX_SIZE; | |
14d7b812 JK |
10857 | dev->tso_max_size = TSO_LEGACY_MAX_SIZE; |
10858 | dev->tso_max_segs = TSO_MAX_SEGS; | |
5343da4c TY |
10859 | dev->upper_level = 1; |
10860 | dev->lower_level = 1; | |
1fc70edb TY |
10861 | #ifdef CONFIG_LOCKDEP |
10862 | dev->nested_level = 0; | |
10863 | INIT_LIST_HEAD(&dev->unlink_list); | |
10864 | #endif | |
8d3bdbd5 | 10865 | |
8d3bdbd5 DM |
10866 | INIT_LIST_HEAD(&dev->napi_list); |
10867 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 10868 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 10869 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
10870 | INIT_LIST_HEAD(&dev->adj_list.upper); |
10871 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
7866a621 SN |
10872 | INIT_LIST_HEAD(&dev->ptype_all); |
10873 | INIT_LIST_HEAD(&dev->ptype_specific); | |
93642e14 | 10874 | INIT_LIST_HEAD(&dev->net_notifier_list); |
59cc1f61 JK |
10875 | #ifdef CONFIG_NET_SCHED |
10876 | hash_init(dev->qdisc_hash); | |
10877 | #endif | |
02875878 | 10878 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
10879 | setup(dev); |
10880 | ||
a813104d | 10881 | if (!dev->tx_queue_len) { |
f84bb1ea | 10882 | dev->priv_flags |= IFF_NO_QUEUE; |
11597084 | 10883 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
a813104d | 10884 | } |
906470c1 | 10885 | |
36909ea4 TH |
10886 | dev->num_tx_queues = txqs; |
10887 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 10888 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 10889 | goto free_all; |
e8a0464c | 10890 | |
36909ea4 TH |
10891 | dev->num_rx_queues = rxqs; |
10892 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 10893 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 10894 | goto free_all; |
0a9627f2 | 10895 | |
1da177e4 | 10896 | strcpy(dev->name, name); |
c835a677 | 10897 | dev->name_assign_type = name_assign_type; |
cbda10fa | 10898 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
10899 | if (!dev->ethtool_ops) |
10900 | dev->ethtool_ops = &default_ethtool_ops; | |
e687ad60 | 10901 | |
17d20784 | 10902 | nf_hook_netdev_init(dev); |
e687ad60 | 10903 | |
1da177e4 | 10904 | return dev; |
ab9c73cc | 10905 | |
8d3bdbd5 DM |
10906 | free_all: |
10907 | free_netdev(dev); | |
10908 | return NULL; | |
10909 | ||
29b4433d | 10910 | free_pcpu: |
919067cc | 10911 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d | 10912 | free_percpu(dev->pcpu_refcnt); |
74d332c1 | 10913 | free_dev: |
919067cc | 10914 | #endif |
74d332c1 | 10915 | netdev_freemem(dev); |
ab9c73cc | 10916 | return NULL; |
1da177e4 | 10917 | } |
36909ea4 | 10918 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
10919 | |
10920 | /** | |
722c9a0c | 10921 | * free_netdev - free network device |
10922 | * @dev: device | |
1da177e4 | 10923 | * |
722c9a0c | 10924 | * This function does the last stage of destroying an allocated device |
10925 | * interface. The reference to the device object is released. If this | |
10926 | * is the last reference then it will be freed.Must be called in process | |
10927 | * context. | |
1da177e4 LT |
10928 | */ |
10929 | void free_netdev(struct net_device *dev) | |
10930 | { | |
d565b0a1 HX |
10931 | struct napi_struct *p, *n; |
10932 | ||
93d05d4a | 10933 | might_sleep(); |
c269a24c JK |
10934 | |
10935 | /* When called immediately after register_netdevice() failed the unwind | |
10936 | * handling may still be dismantling the device. Handle that case by | |
10937 | * deferring the free. | |
10938 | */ | |
10939 | if (dev->reg_state == NETREG_UNREGISTERING) { | |
10940 | ASSERT_RTNL(); | |
10941 | dev->needs_free_netdev = true; | |
10942 | return; | |
10943 | } | |
10944 | ||
60877a32 | 10945 | netif_free_tx_queues(dev); |
e817f856 | 10946 | netif_free_rx_queues(dev); |
e8a0464c | 10947 | |
33d480ce | 10948 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 10949 | |
f001fde5 JP |
10950 | /* Flush device addresses */ |
10951 | dev_addr_flush(dev); | |
10952 | ||
d565b0a1 HX |
10953 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
10954 | netif_napi_del(p); | |
10955 | ||
4d92b95f | 10956 | ref_tracker_dir_exit(&dev->refcnt_tracker); |
919067cc | 10957 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d ED |
10958 | free_percpu(dev->pcpu_refcnt); |
10959 | dev->pcpu_refcnt = NULL; | |
919067cc | 10960 | #endif |
625788b5 ED |
10961 | free_percpu(dev->core_stats); |
10962 | dev->core_stats = NULL; | |
75ccae62 THJ |
10963 | free_percpu(dev->xdp_bulkq); |
10964 | dev->xdp_bulkq = NULL; | |
29b4433d | 10965 | |
3041a069 | 10966 | /* Compatibility with error handling in drivers */ |
1da177e4 | 10967 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 10968 | netdev_freemem(dev); |
1da177e4 LT |
10969 | return; |
10970 | } | |
10971 | ||
10972 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
10973 | dev->reg_state = NETREG_RELEASED; | |
10974 | ||
43cb76d9 GKH |
10975 | /* will free via device release */ |
10976 | put_device(&dev->dev); | |
1da177e4 | 10977 | } |
d1b19dff | 10978 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 10979 | |
f0db275a SH |
10980 | /** |
10981 | * synchronize_net - Synchronize with packet receive processing | |
10982 | * | |
10983 | * Wait for packets currently being received to be done. | |
10984 | * Does not block later packets from starting. | |
10985 | */ | |
4ec93edb | 10986 | void synchronize_net(void) |
1da177e4 LT |
10987 | { |
10988 | might_sleep(); | |
be3fc413 ED |
10989 | if (rtnl_is_locked()) |
10990 | synchronize_rcu_expedited(); | |
10991 | else | |
10992 | synchronize_rcu(); | |
1da177e4 | 10993 | } |
d1b19dff | 10994 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
10995 | |
10996 | /** | |
44a0873d | 10997 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 10998 | * @dev: device |
44a0873d | 10999 | * @head: list |
6ebfbc06 | 11000 | * |
1da177e4 | 11001 | * This function shuts down a device interface and removes it |
d59b54b1 | 11002 | * from the kernel tables. |
44a0873d | 11003 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
11004 | * |
11005 | * Callers must hold the rtnl semaphore. You may want | |
11006 | * unregister_netdev() instead of this. | |
11007 | */ | |
11008 | ||
44a0873d | 11009 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 11010 | { |
a6620712 HX |
11011 | ASSERT_RTNL(); |
11012 | ||
44a0873d | 11013 | if (head) { |
9fdce099 | 11014 | list_move_tail(&dev->unreg_list, head); |
44a0873d | 11015 | } else { |
037e56bd JK |
11016 | LIST_HEAD(single); |
11017 | ||
11018 | list_add(&dev->unreg_list, &single); | |
0cbe1e57 | 11019 | unregister_netdevice_many(&single); |
44a0873d | 11020 | } |
1da177e4 | 11021 | } |
44a0873d | 11022 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 11023 | |
77f4aa9a HL |
11024 | void unregister_netdevice_many_notify(struct list_head *head, |
11025 | u32 portid, const struct nlmsghdr *nlh) | |
bcfe2f1a JK |
11026 | { |
11027 | struct net_device *dev, *tmp; | |
11028 | LIST_HEAD(close_head); | |
11029 | ||
11030 | BUG_ON(dev_boot_phase); | |
11031 | ASSERT_RTNL(); | |
11032 | ||
0cbe1e57 JK |
11033 | if (list_empty(head)) |
11034 | return; | |
11035 | ||
bcfe2f1a JK |
11036 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
11037 | /* Some devices call without registering | |
11038 | * for initialization unwind. Remove those | |
11039 | * devices and proceed with the remaining. | |
11040 | */ | |
11041 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
11042 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", | |
11043 | dev->name, dev); | |
11044 | ||
11045 | WARN_ON(1); | |
11046 | list_del(&dev->unreg_list); | |
11047 | continue; | |
11048 | } | |
11049 | dev->dismantle = true; | |
11050 | BUG_ON(dev->reg_state != NETREG_REGISTERED); | |
11051 | } | |
11052 | ||
11053 | /* If device is running, close it first. */ | |
11054 | list_for_each_entry(dev, head, unreg_list) | |
11055 | list_add_tail(&dev->close_list, &close_head); | |
11056 | dev_close_many(&close_head, true); | |
11057 | ||
11058 | list_for_each_entry(dev, head, unreg_list) { | |
11059 | /* And unlink it from device chain. */ | |
cc26c266 ED |
11060 | write_lock(&dev_base_lock); |
11061 | unlist_netdevice(dev, false); | |
bcfe2f1a | 11062 | dev->reg_state = NETREG_UNREGISTERING; |
cc26c266 | 11063 | write_unlock(&dev_base_lock); |
bcfe2f1a JK |
11064 | } |
11065 | flush_all_backlogs(); | |
11066 | ||
11067 | synchronize_net(); | |
11068 | ||
11069 | list_for_each_entry(dev, head, unreg_list) { | |
11070 | struct sk_buff *skb = NULL; | |
11071 | ||
11072 | /* Shutdown queueing discipline. */ | |
11073 | dev_shutdown(dev); | |
e420bed0 | 11074 | dev_tcx_uninstall(dev); |
bcfe2f1a | 11075 | dev_xdp_uninstall(dev); |
2b3486bc | 11076 | bpf_dev_bound_netdev_unregister(dev); |
bcfe2f1a | 11077 | |
9309f97a PM |
11078 | netdev_offload_xstats_disable_all(dev); |
11079 | ||
bcfe2f1a JK |
11080 | /* Notify protocols, that we are about to destroy |
11081 | * this device. They should clean all the things. | |
11082 | */ | |
11083 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
11084 | ||
11085 | if (!dev->rtnl_link_ops || | |
11086 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
11087 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, | |
77f4aa9a | 11088 | GFP_KERNEL, NULL, 0, |
59d3efd2 | 11089 | portid, nlh); |
bcfe2f1a JK |
11090 | |
11091 | /* | |
11092 | * Flush the unicast and multicast chains | |
11093 | */ | |
11094 | dev_uc_flush(dev); | |
11095 | dev_mc_flush(dev); | |
11096 | ||
11097 | netdev_name_node_alt_flush(dev); | |
11098 | netdev_name_node_free(dev->name_node); | |
11099 | ||
02a68a47 JP |
11100 | call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev); |
11101 | ||
bcfe2f1a JK |
11102 | if (dev->netdev_ops->ndo_uninit) |
11103 | dev->netdev_ops->ndo_uninit(dev); | |
11104 | ||
11105 | if (skb) | |
77f4aa9a | 11106 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL, portid, nlh); |
bcfe2f1a JK |
11107 | |
11108 | /* Notifier chain MUST detach us all upper devices. */ | |
11109 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
11110 | WARN_ON(netdev_has_any_lower_dev(dev)); | |
11111 | ||
11112 | /* Remove entries from kobject tree */ | |
11113 | netdev_unregister_kobject(dev); | |
11114 | #ifdef CONFIG_XPS | |
11115 | /* Remove XPS queueing entries */ | |
11116 | netif_reset_xps_queues_gt(dev, 0); | |
11117 | #endif | |
11118 | } | |
11119 | ||
11120 | synchronize_net(); | |
11121 | ||
11122 | list_for_each_entry(dev, head, unreg_list) { | |
d62607c3 | 11123 | netdev_put(dev, &dev->dev_registered_tracker); |
bcfe2f1a JK |
11124 | net_set_todo(dev); |
11125 | } | |
0cbe1e57 JK |
11126 | |
11127 | list_del(head); | |
bcfe2f1a | 11128 | } |
77f4aa9a HL |
11129 | |
11130 | /** | |
11131 | * unregister_netdevice_many - unregister many devices | |
11132 | * @head: list of devices | |
11133 | * | |
11134 | * Note: As most callers use a stack allocated list_head, | |
11135 | * we force a list_del() to make sure stack wont be corrupted later. | |
11136 | */ | |
11137 | void unregister_netdevice_many(struct list_head *head) | |
11138 | { | |
11139 | unregister_netdevice_many_notify(head, 0, NULL); | |
11140 | } | |
0cbe1e57 | 11141 | EXPORT_SYMBOL(unregister_netdevice_many); |
bcfe2f1a | 11142 | |
1da177e4 LT |
11143 | /** |
11144 | * unregister_netdev - remove device from the kernel | |
11145 | * @dev: device | |
11146 | * | |
11147 | * This function shuts down a device interface and removes it | |
d59b54b1 | 11148 | * from the kernel tables. |
1da177e4 LT |
11149 | * |
11150 | * This is just a wrapper for unregister_netdevice that takes | |
11151 | * the rtnl semaphore. In general you want to use this and not | |
11152 | * unregister_netdevice. | |
11153 | */ | |
11154 | void unregister_netdev(struct net_device *dev) | |
11155 | { | |
11156 | rtnl_lock(); | |
11157 | unregister_netdevice(dev); | |
11158 | rtnl_unlock(); | |
11159 | } | |
1da177e4 LT |
11160 | EXPORT_SYMBOL(unregister_netdev); |
11161 | ||
ce286d32 | 11162 | /** |
0854fa82 | 11163 | * __dev_change_net_namespace - move device to different nethost namespace |
ce286d32 EB |
11164 | * @dev: device |
11165 | * @net: network namespace | |
11166 | * @pat: If not NULL name pattern to try if the current device name | |
11167 | * is already taken in the destination network namespace. | |
eeb85a14 AV |
11168 | * @new_ifindex: If not zero, specifies device index in the target |
11169 | * namespace. | |
ce286d32 EB |
11170 | * |
11171 | * This function shuts down a device interface and moves it | |
11172 | * to a new network namespace. On success 0 is returned, on | |
11173 | * a failure a netagive errno code is returned. | |
11174 | * | |
11175 | * Callers must hold the rtnl semaphore. | |
11176 | */ | |
11177 | ||
0854fa82 AV |
11178 | int __dev_change_net_namespace(struct net_device *dev, struct net *net, |
11179 | const char *pat, int new_ifindex) | |
ce286d32 | 11180 | { |
7663d522 | 11181 | struct netdev_name_node *name_node; |
ef6a4c88 | 11182 | struct net *net_old = dev_net(dev); |
311cca40 | 11183 | char new_name[IFNAMSIZ] = {}; |
eeb85a14 | 11184 | int err, new_nsid; |
ce286d32 EB |
11185 | |
11186 | ASSERT_RTNL(); | |
11187 | ||
11188 | /* Don't allow namespace local devices to be moved. */ | |
11189 | err = -EINVAL; | |
11190 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
11191 | goto out; | |
11192 | ||
11193 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
11194 | if (dev->reg_state != NETREG_REGISTERED) |
11195 | goto out; | |
11196 | ||
11197 | /* Get out if there is nothing todo */ | |
11198 | err = 0; | |
ef6a4c88 | 11199 | if (net_eq(net_old, net)) |
ce286d32 EB |
11200 | goto out; |
11201 | ||
11202 | /* Pick the destination device name, and ensure | |
11203 | * we can use it in the destination network namespace. | |
11204 | */ | |
11205 | err = -EEXIST; | |
75ea27d0 | 11206 | if (netdev_name_in_use(net, dev->name)) { |
ce286d32 EB |
11207 | /* We get here if we can't use the current device name */ |
11208 | if (!pat) | |
11209 | goto out; | |
556c755a | 11210 | err = dev_prep_valid_name(net, dev, pat, new_name, EEXIST); |
7892bd08 | 11211 | if (err < 0) |
ce286d32 EB |
11212 | goto out; |
11213 | } | |
7663d522 JK |
11214 | /* Check that none of the altnames conflicts. */ |
11215 | err = -EEXIST; | |
11216 | netdev_for_each_altname(dev, name_node) | |
11217 | if (netdev_name_in_use(net, name_node->name)) | |
11218 | goto out; | |
ce286d32 | 11219 | |
eeb85a14 | 11220 | /* Check that new_ifindex isn't used yet. */ |
759ab1ed JK |
11221 | if (new_ifindex) { |
11222 | err = dev_index_reserve(net, new_ifindex); | |
11223 | if (err < 0) | |
11224 | goto out; | |
11225 | } else { | |
11226 | /* If there is an ifindex conflict assign a new one */ | |
11227 | err = dev_index_reserve(net, dev->ifindex); | |
11228 | if (err == -EBUSY) | |
11229 | err = dev_index_reserve(net, 0); | |
11230 | if (err < 0) | |
11231 | goto out; | |
11232 | new_ifindex = err; | |
11233 | } | |
eeb85a14 | 11234 | |
ce286d32 EB |
11235 | /* |
11236 | * And now a mini version of register_netdevice unregister_netdevice. | |
11237 | */ | |
11238 | ||
11239 | /* If device is running close it first. */ | |
9b772652 | 11240 | dev_close(dev); |
ce286d32 EB |
11241 | |
11242 | /* And unlink it from device chain */ | |
cc26c266 | 11243 | unlist_netdevice(dev, true); |
ce286d32 EB |
11244 | |
11245 | synchronize_net(); | |
11246 | ||
11247 | /* Shutdown queueing discipline. */ | |
11248 | dev_shutdown(dev); | |
11249 | ||
11250 | /* Notify protocols, that we are about to destroy | |
eb13da1a | 11251 | * this device. They should clean all the things. |
11252 | * | |
11253 | * Note that dev->reg_state stays at NETREG_REGISTERED. | |
11254 | * This is wanted because this way 8021q and macvlan know | |
11255 | * the device is just moving and can keep their slaves up. | |
11256 | */ | |
ce286d32 | 11257 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
6549dd43 | 11258 | rcu_barrier(); |
38e01b30 | 11259 | |
d4e4fdf9 | 11260 | new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL); |
38e01b30 ND |
11261 | |
11262 | rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, | |
11263 | new_ifindex); | |
ce286d32 EB |
11264 | |
11265 | /* | |
11266 | * Flush the unicast and multicast chains | |
11267 | */ | |
a748ee24 | 11268 | dev_uc_flush(dev); |
22bedad3 | 11269 | dev_mc_flush(dev); |
ce286d32 | 11270 | |
4e66ae2e SH |
11271 | /* Send a netdev-removed uevent to the old namespace */ |
11272 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 11273 | netdev_adjacent_del_links(dev); |
4e66ae2e | 11274 | |
93642e14 JP |
11275 | /* Move per-net netdevice notifiers that are following the netdevice */ |
11276 | move_netdevice_notifiers_dev_net(dev, net); | |
11277 | ||
ce286d32 | 11278 | /* Actually switch the network namespace */ |
c346dca1 | 11279 | dev_net_set(dev, net); |
38e01b30 | 11280 | dev->ifindex = new_ifindex; |
ce286d32 | 11281 | |
311cca40 JK |
11282 | if (new_name[0]) /* Rename the netdev to prepared name */ |
11283 | strscpy(dev->name, new_name, IFNAMSIZ); | |
11284 | ||
8b41d188 | 11285 | /* Fixup kobjects */ |
dd891b5b | 11286 | dev_set_uevent_suppress(&dev->dev, 1); |
a1b3f594 | 11287 | err = device_rename(&dev->dev, dev->name); |
dd891b5b | 11288 | dev_set_uevent_suppress(&dev->dev, 0); |
8b41d188 | 11289 | WARN_ON(err); |
ce286d32 | 11290 | |
dd891b5b JK |
11291 | /* Send a netdev-add uevent to the new namespace */ |
11292 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
11293 | netdev_adjacent_add_links(dev); | |
11294 | ||
ef6a4c88 CB |
11295 | /* Adapt owner in case owning user namespace of target network |
11296 | * namespace is different from the original one. | |
11297 | */ | |
11298 | err = netdev_change_owner(dev, net_old, net); | |
11299 | WARN_ON(err); | |
11300 | ||
ce286d32 EB |
11301 | /* Add the device back in the hashes */ |
11302 | list_netdevice(dev); | |
11303 | ||
11304 | /* Notify protocols, that a new device appeared. */ | |
11305 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
11306 | ||
d90a909e EB |
11307 | /* |
11308 | * Prevent userspace races by waiting until the network | |
11309 | * device is fully setup before sending notifications. | |
11310 | */ | |
1d997f10 | 11311 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL); |
d90a909e | 11312 | |
ce286d32 EB |
11313 | synchronize_net(); |
11314 | err = 0; | |
11315 | out: | |
11316 | return err; | |
11317 | } | |
0854fa82 | 11318 | EXPORT_SYMBOL_GPL(__dev_change_net_namespace); |
ce286d32 | 11319 | |
f0bf90de | 11320 | static int dev_cpu_dead(unsigned int oldcpu) |
1da177e4 LT |
11321 | { |
11322 | struct sk_buff **list_skb; | |
1da177e4 | 11323 | struct sk_buff *skb; |
f0bf90de | 11324 | unsigned int cpu; |
97d8b6e3 | 11325 | struct softnet_data *sd, *oldsd, *remsd = NULL; |
1da177e4 | 11326 | |
1da177e4 LT |
11327 | local_irq_disable(); |
11328 | cpu = smp_processor_id(); | |
11329 | sd = &per_cpu(softnet_data, cpu); | |
11330 | oldsd = &per_cpu(softnet_data, oldcpu); | |
11331 | ||
11332 | /* Find end of our completion_queue. */ | |
11333 | list_skb = &sd->completion_queue; | |
11334 | while (*list_skb) | |
11335 | list_skb = &(*list_skb)->next; | |
11336 | /* Append completion queue from offline CPU. */ | |
11337 | *list_skb = oldsd->completion_queue; | |
11338 | oldsd->completion_queue = NULL; | |
11339 | ||
1da177e4 | 11340 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
11341 | if (oldsd->output_queue) { |
11342 | *sd->output_queue_tailp = oldsd->output_queue; | |
11343 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
11344 | oldsd->output_queue = NULL; | |
11345 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
11346 | } | |
ac64da0b ED |
11347 | /* Append NAPI poll list from offline CPU, with one exception : |
11348 | * process_backlog() must be called by cpu owning percpu backlog. | |
11349 | * We properly handle process_queue & input_pkt_queue later. | |
11350 | */ | |
11351 | while (!list_empty(&oldsd->poll_list)) { | |
11352 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
11353 | struct napi_struct, | |
11354 | poll_list); | |
11355 | ||
11356 | list_del_init(&napi->poll_list); | |
11357 | if (napi->poll == process_backlog) | |
11358 | napi->state = 0; | |
11359 | else | |
11360 | ____napi_schedule(sd, napi); | |
264524d5 | 11361 | } |
1da177e4 LT |
11362 | |
11363 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
11364 | local_irq_enable(); | |
11365 | ||
773fc8f6 | 11366 | #ifdef CONFIG_RPS |
11367 | remsd = oldsd->rps_ipi_list; | |
11368 | oldsd->rps_ipi_list = NULL; | |
11369 | #endif | |
11370 | /* send out pending IPI's on offline CPU */ | |
11371 | net_rps_send_ipi(remsd); | |
11372 | ||
1da177e4 | 11373 | /* Process offline CPU's input_pkt_queue */ |
76cc8b13 | 11374 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
ad0a043f | 11375 | netif_rx(skb); |
76cc8b13 | 11376 | input_queue_head_incr(oldsd); |
fec5e652 | 11377 | } |
ac64da0b | 11378 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
ad0a043f | 11379 | netif_rx(skb); |
76cc8b13 TH |
11380 | input_queue_head_incr(oldsd); |
11381 | } | |
1da177e4 | 11382 | |
f0bf90de | 11383 | return 0; |
1da177e4 | 11384 | } |
1da177e4 | 11385 | |
7f353bf2 | 11386 | /** |
b63365a2 HX |
11387 | * netdev_increment_features - increment feature set by one |
11388 | * @all: current feature set | |
11389 | * @one: new feature set | |
11390 | * @mask: mask feature set | |
7f353bf2 HX |
11391 | * |
11392 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
11393 | * @one to the master device with current feature set @all. Will not |
11394 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 11395 | */ |
c8f44aff MM |
11396 | netdev_features_t netdev_increment_features(netdev_features_t all, |
11397 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 11398 | { |
c8cd0989 | 11399 | if (mask & NETIF_F_HW_CSUM) |
a188222b | 11400 | mask |= NETIF_F_CSUM_MASK; |
1742f183 | 11401 | mask |= NETIF_F_VLAN_CHALLENGED; |
7f353bf2 | 11402 | |
a188222b | 11403 | all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
1742f183 | 11404 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
c6e1a0d1 | 11405 | |
1742f183 | 11406 | /* If one device supports hw checksumming, set for all. */ |
c8cd0989 TH |
11407 | if (all & NETIF_F_HW_CSUM) |
11408 | all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); | |
7f353bf2 HX |
11409 | |
11410 | return all; | |
11411 | } | |
b63365a2 | 11412 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 11413 | |
430f03cd | 11414 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
11415 | { |
11416 | int i; | |
11417 | struct hlist_head *hash; | |
11418 | ||
6da2ec56 | 11419 | hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL); |
30d97d35 PE |
11420 | if (hash != NULL) |
11421 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
11422 | INIT_HLIST_HEAD(&hash[i]); | |
11423 | ||
11424 | return hash; | |
11425 | } | |
11426 | ||
881d966b | 11427 | /* Initialize per network namespace state */ |
4665079c | 11428 | static int __net_init netdev_init(struct net *net) |
881d966b | 11429 | { |
d9f37d01 | 11430 | BUILD_BUG_ON(GRO_HASH_BUCKETS > |
c593642c | 11431 | 8 * sizeof_field(struct napi_struct, gro_bitmask)); |
d9f37d01 | 11432 | |
9c1be193 | 11433 | INIT_LIST_HEAD(&net->dev_base_head); |
881d966b | 11434 | |
30d97d35 PE |
11435 | net->dev_name_head = netdev_create_hash(); |
11436 | if (net->dev_name_head == NULL) | |
11437 | goto err_name; | |
881d966b | 11438 | |
30d97d35 PE |
11439 | net->dev_index_head = netdev_create_hash(); |
11440 | if (net->dev_index_head == NULL) | |
11441 | goto err_idx; | |
881d966b | 11442 | |
ceaac91d | 11443 | xa_init_flags(&net->dev_by_index, XA_FLAGS_ALLOC1); |
759ab1ed | 11444 | |
a30c7b42 JP |
11445 | RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain); |
11446 | ||
881d966b | 11447 | return 0; |
30d97d35 PE |
11448 | |
11449 | err_idx: | |
11450 | kfree(net->dev_name_head); | |
11451 | err_name: | |
11452 | return -ENOMEM; | |
881d966b EB |
11453 | } |
11454 | ||
f0db275a SH |
11455 | /** |
11456 | * netdev_drivername - network driver for the device | |
11457 | * @dev: network device | |
f0db275a SH |
11458 | * |
11459 | * Determine network driver for device. | |
11460 | */ | |
3019de12 | 11461 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 11462 | { |
cf04a4c7 SH |
11463 | const struct device_driver *driver; |
11464 | const struct device *parent; | |
3019de12 | 11465 | const char *empty = ""; |
6579e57b AV |
11466 | |
11467 | parent = dev->dev.parent; | |
6579e57b | 11468 | if (!parent) |
3019de12 | 11469 | return empty; |
6579e57b AV |
11470 | |
11471 | driver = parent->driver; | |
11472 | if (driver && driver->name) | |
3019de12 DM |
11473 | return driver->name; |
11474 | return empty; | |
6579e57b AV |
11475 | } |
11476 | ||
6ea754eb JP |
11477 | static void __netdev_printk(const char *level, const struct net_device *dev, |
11478 | struct va_format *vaf) | |
256df2f3 | 11479 | { |
b004ff49 | 11480 | if (dev && dev->dev.parent) { |
6ea754eb JP |
11481 | dev_printk_emit(level[1] - '0', |
11482 | dev->dev.parent, | |
11483 | "%s %s %s%s: %pV", | |
11484 | dev_driver_string(dev->dev.parent), | |
11485 | dev_name(dev->dev.parent), | |
11486 | netdev_name(dev), netdev_reg_state(dev), | |
11487 | vaf); | |
b004ff49 | 11488 | } else if (dev) { |
6ea754eb JP |
11489 | printk("%s%s%s: %pV", |
11490 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 11491 | } else { |
6ea754eb | 11492 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 11493 | } |
256df2f3 JP |
11494 | } |
11495 | ||
6ea754eb JP |
11496 | void netdev_printk(const char *level, const struct net_device *dev, |
11497 | const char *format, ...) | |
256df2f3 JP |
11498 | { |
11499 | struct va_format vaf; | |
11500 | va_list args; | |
256df2f3 JP |
11501 | |
11502 | va_start(args, format); | |
11503 | ||
11504 | vaf.fmt = format; | |
11505 | vaf.va = &args; | |
11506 | ||
6ea754eb | 11507 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 11508 | |
256df2f3 | 11509 | va_end(args); |
256df2f3 JP |
11510 | } |
11511 | EXPORT_SYMBOL(netdev_printk); | |
11512 | ||
11513 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 11514 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 11515 | { \ |
256df2f3 JP |
11516 | struct va_format vaf; \ |
11517 | va_list args; \ | |
11518 | \ | |
11519 | va_start(args, fmt); \ | |
11520 | \ | |
11521 | vaf.fmt = fmt; \ | |
11522 | vaf.va = &args; \ | |
11523 | \ | |
6ea754eb | 11524 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 11525 | \ |
256df2f3 | 11526 | va_end(args); \ |
256df2f3 JP |
11527 | } \ |
11528 | EXPORT_SYMBOL(func); | |
11529 | ||
11530 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
11531 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
11532 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
11533 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
11534 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
11535 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
11536 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
11537 | ||
4665079c | 11538 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
11539 | { |
11540 | kfree(net->dev_name_head); | |
11541 | kfree(net->dev_index_head); | |
759ab1ed | 11542 | xa_destroy(&net->dev_by_index); |
ee21b18b VA |
11543 | if (net != &init_net) |
11544 | WARN_ON_ONCE(!list_empty(&net->dev_base_head)); | |
881d966b EB |
11545 | } |
11546 | ||
022cbae6 | 11547 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
11548 | .init = netdev_init, |
11549 | .exit = netdev_exit, | |
11550 | }; | |
11551 | ||
ee403248 | 11552 | static void __net_exit default_device_exit_net(struct net *net) |
ce286d32 | 11553 | { |
d09486a0 | 11554 | struct netdev_name_node *name_node, *tmp; |
e008b5fc | 11555 | struct net_device *dev, *aux; |
ce286d32 | 11556 | /* |
e008b5fc | 11557 | * Push all migratable network devices back to the |
ce286d32 EB |
11558 | * initial network namespace |
11559 | */ | |
ee403248 | 11560 | ASSERT_RTNL(); |
e008b5fc | 11561 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 11562 | int err; |
aca51397 | 11563 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
11564 | |
11565 | /* Ignore unmoveable devices (i.e. loopback) */ | |
11566 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
11567 | continue; | |
11568 | ||
e008b5fc | 11569 | /* Leave virtual devices for the generic cleanup */ |
3a5ca857 | 11570 | if (dev->rtnl_link_ops && !dev->rtnl_link_ops->netns_refund) |
e008b5fc | 11571 | continue; |
d0c082ce | 11572 | |
25985edc | 11573 | /* Push remaining network devices to init_net */ |
aca51397 | 11574 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
75ea27d0 | 11575 | if (netdev_name_in_use(&init_net, fb_name)) |
55b40dbf | 11576 | snprintf(fb_name, IFNAMSIZ, "dev%%d"); |
d09486a0 JK |
11577 | |
11578 | netdev_for_each_altname_safe(dev, name_node, tmp) | |
11579 | if (netdev_name_in_use(&init_net, name_node->name)) { | |
11580 | netdev_name_node_del(name_node); | |
11581 | synchronize_rcu(); | |
11582 | __netdev_name_node_alt_destroy(name_node); | |
11583 | } | |
11584 | ||
0854fa82 | 11585 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
ce286d32 | 11586 | if (err) { |
7b6cd1ce JP |
11587 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
11588 | __func__, dev->name, err); | |
aca51397 | 11589 | BUG(); |
ce286d32 EB |
11590 | } |
11591 | } | |
ce286d32 EB |
11592 | } |
11593 | ||
04dc7f6b EB |
11594 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
11595 | { | |
11596 | /* At exit all network devices most be removed from a network | |
b595076a | 11597 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
11598 | * Do this across as many network namespaces as possible to |
11599 | * improve batching efficiency. | |
11600 | */ | |
11601 | struct net_device *dev; | |
11602 | struct net *net; | |
11603 | LIST_HEAD(dev_kill_list); | |
11604 | ||
ee403248 ED |
11605 | rtnl_lock(); |
11606 | list_for_each_entry(net, net_list, exit_list) { | |
11607 | default_device_exit_net(net); | |
11608 | cond_resched(); | |
11609 | } | |
ee403248 | 11610 | |
04dc7f6b EB |
11611 | list_for_each_entry(net, net_list, exit_list) { |
11612 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 11613 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
11614 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
11615 | else | |
11616 | unregister_netdevice_queue(dev, &dev_kill_list); | |
11617 | } | |
11618 | } | |
11619 | unregister_netdevice_many(&dev_kill_list); | |
11620 | rtnl_unlock(); | |
11621 | } | |
11622 | ||
022cbae6 | 11623 | static struct pernet_operations __net_initdata default_device_ops = { |
04dc7f6b | 11624 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
11625 | }; |
11626 | ||
43a71cd6 CL |
11627 | static void __init net_dev_struct_check(void) |
11628 | { | |
11629 | /* TX read-mostly hotpath */ | |
11630 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, priv_flags); | |
11631 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, netdev_ops); | |
11632 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, header_ops); | |
11633 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, _tx); | |
11634 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, real_num_tx_queues); | |
11635 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size); | |
11636 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size); | |
11637 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs); | |
993498e5 | 11638 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_partial_features); |
43a71cd6 CL |
11639 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc); |
11640 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu); | |
11641 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom); | |
11642 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tc_to_txq); | |
11643 | #ifdef CONFIG_XPS | |
11644 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, xps_maps); | |
11645 | #endif | |
11646 | #ifdef CONFIG_NETFILTER_EGRESS | |
11647 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, nf_hooks_egress); | |
11648 | #endif | |
11649 | #ifdef CONFIG_NET_XGRESS | |
11650 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress); | |
11651 | #endif | |
993498e5 | 11652 | CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 160); |
43a71cd6 CL |
11653 | |
11654 | /* TXRX read-mostly hotpath */ | |
c353c7b7 | 11655 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, lstats); |
43a71cd6 CL |
11656 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags); |
11657 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len); | |
11658 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features); | |
11659 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr); | |
c353c7b7 | 11660 | CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 38); |
43a71cd6 CL |
11661 | |
11662 | /* RX read-mostly hotpath */ | |
11663 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific); | |
11664 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ifindex); | |
11665 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, real_num_rx_queues); | |
11666 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, _rx); | |
11667 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_flush_timeout); | |
11668 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, napi_defer_hard_irqs); | |
11669 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_max_size); | |
11670 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_ipv4_max_size); | |
11671 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler); | |
11672 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler_data); | |
11673 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, nd_net); | |
11674 | #ifdef CONFIG_NETPOLL | |
11675 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, npinfo); | |
11676 | #endif | |
11677 | #ifdef CONFIG_NET_XGRESS | |
11678 | CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, tcx_ingress); | |
11679 | #endif | |
d3d344a1 | 11680 | CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_rx, 104); |
43a71cd6 CL |
11681 | } |
11682 | ||
1da177e4 LT |
11683 | /* |
11684 | * Initialize the DEV module. At boot time this walks the device list and | |
11685 | * unhooks any devices that fail to initialise (normally hardware not | |
11686 | * present) and leaves us with a valid list of present and active devices. | |
11687 | * | |
11688 | */ | |
11689 | ||
11690 | /* | |
11691 | * This is called single threaded during boot, so no need | |
11692 | * to take the rtnl semaphore. | |
11693 | */ | |
11694 | static int __init net_dev_init(void) | |
11695 | { | |
11696 | int i, rc = -ENOMEM; | |
11697 | ||
11698 | BUG_ON(!dev_boot_phase); | |
11699 | ||
43a71cd6 CL |
11700 | net_dev_struct_check(); |
11701 | ||
1da177e4 LT |
11702 | if (dev_proc_init()) |
11703 | goto out; | |
11704 | ||
8b41d188 | 11705 | if (netdev_kobject_init()) |
1da177e4 LT |
11706 | goto out; |
11707 | ||
11708 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 11709 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
11710 | INIT_LIST_HEAD(&ptype_base[i]); |
11711 | ||
881d966b EB |
11712 | if (register_pernet_subsys(&netdev_net_ops)) |
11713 | goto out; | |
1da177e4 LT |
11714 | |
11715 | /* | |
11716 | * Initialise the packet receive queues. | |
11717 | */ | |
11718 | ||
6f912042 | 11719 | for_each_possible_cpu(i) { |
41852497 | 11720 | struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
e36fa2f7 | 11721 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 11722 | |
41852497 ED |
11723 | INIT_WORK(flush, flush_backlog); |
11724 | ||
e36fa2f7 | 11725 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 11726 | skb_queue_head_init(&sd->process_queue); |
f53c7239 SK |
11727 | #ifdef CONFIG_XFRM_OFFLOAD |
11728 | skb_queue_head_init(&sd->xfrm_backlog); | |
11729 | #endif | |
e36fa2f7 | 11730 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 11731 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 11732 | #ifdef CONFIG_RPS |
545b8c8d | 11733 | INIT_CSD(&sd->csd, rps_trigger_softirq, sd); |
e36fa2f7 | 11734 | sd->cpu = i; |
1e94d72f | 11735 | #endif |
97e719a8 | 11736 | INIT_CSD(&sd->defer_csd, trigger_rx_softirq, sd); |
68822bdf | 11737 | spin_lock_init(&sd->defer_lock); |
0a9627f2 | 11738 | |
7c4ec749 | 11739 | init_gro_hash(&sd->backlog); |
e36fa2f7 ED |
11740 | sd->backlog.poll = process_backlog; |
11741 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
11742 | } |
11743 | ||
1da177e4 LT |
11744 | dev_boot_phase = 0; |
11745 | ||
505d4f73 EB |
11746 | /* The loopback device is special if any other network devices |
11747 | * is present in a network namespace the loopback device must | |
11748 | * be present. Since we now dynamically allocate and free the | |
11749 | * loopback device ensure this invariant is maintained by | |
11750 | * keeping the loopback device as the first device on the | |
11751 | * list of network devices. Ensuring the loopback devices | |
11752 | * is the first device that appears and the last network device | |
11753 | * that disappears. | |
11754 | */ | |
11755 | if (register_pernet_device(&loopback_net_ops)) | |
11756 | goto out; | |
11757 | ||
11758 | if (register_pernet_device(&default_device_ops)) | |
11759 | goto out; | |
11760 | ||
962cf36c CM |
11761 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
11762 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 | 11763 | |
f0bf90de SAS |
11764 | rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
11765 | NULL, dev_cpu_dead); | |
11766 | WARN_ON(rc < 0); | |
1da177e4 LT |
11767 | rc = 0; |
11768 | out: | |
11769 | return rc; | |
11770 | } | |
11771 | ||
11772 | subsys_initcall(net_dev_init); |