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> |
1da177e4 | 72 | #include <linux/bitops.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> |
1da177e4 LT |
110 | #include <linux/highmem.h> |
111 | #include <linux/init.h> | |
1da177e4 | 112 | #include <linux/module.h> |
1da177e4 LT |
113 | #include <linux/netpoll.h> |
114 | #include <linux/rcupdate.h> | |
115 | #include <linux/delay.h> | |
1da177e4 | 116 | #include <net/iw_handler.h> |
1da177e4 | 117 | #include <asm/current.h> |
5bdb9886 | 118 | #include <linux/audit.h> |
db217334 | 119 | #include <linux/dmaengine.h> |
f6a78bfc | 120 | #include <linux/err.h> |
c7fa9d18 | 121 | #include <linux/ctype.h> |
723e98b7 | 122 | #include <linux/if_arp.h> |
6de329e2 | 123 | #include <linux/if_vlan.h> |
8f0f2223 | 124 | #include <linux/ip.h> |
ad55dcaf | 125 | #include <net/ip.h> |
25cd9ba0 | 126 | #include <net/mpls.h> |
8f0f2223 DM |
127 | #include <linux/ipv6.h> |
128 | #include <linux/in.h> | |
b6b2fed1 DM |
129 | #include <linux/jhash.h> |
130 | #include <linux/random.h> | |
9cbc1cb8 | 131 | #include <trace/events/napi.h> |
cf66ba58 | 132 | #include <trace/events/net.h> |
07dc22e7 | 133 | #include <trace/events/skb.h> |
70713ddd | 134 | #include <trace/events/qdisc.h> |
caeda9b9 | 135 | #include <linux/inetdevice.h> |
c445477d | 136 | #include <linux/cpu_rmap.h> |
c5905afb | 137 | #include <linux/static_key.h> |
af12fa6e | 138 | #include <linux/hashtable.h> |
60877a32 | 139 | #include <linux/vmalloc.h> |
529d0489 | 140 | #include <linux/if_macvlan.h> |
e7fd2885 | 141 | #include <linux/errqueue.h> |
3b47d303 | 142 | #include <linux/hrtimer.h> |
357b6cc5 | 143 | #include <linux/netfilter_ingress.h> |
40e4e713 | 144 | #include <linux/crash_dump.h> |
b72b5bf6 | 145 | #include <linux/sctp.h> |
ae847f40 | 146 | #include <net/udp_tunnel.h> |
6621dd29 | 147 | #include <linux/net_namespace.h> |
aaa5d90b | 148 | #include <linux/indirect_call_wrapper.h> |
af3836df | 149 | #include <net/devlink.h> |
bd869245 | 150 | #include <linux/pm_runtime.h> |
3744741a | 151 | #include <linux/prandom.h> |
127d7355 | 152 | #include <linux/once_lite.h> |
1da177e4 | 153 | |
342709ef PE |
154 | #include "net-sysfs.h" |
155 | ||
d565b0a1 HX |
156 | #define MAX_GRO_SKBS 8 |
157 | ||
5d38a079 HX |
158 | /* This should be increased if a protocol with a bigger head is added. */ |
159 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
160 | ||
1da177e4 | 161 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 162 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
163 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
164 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 165 | static struct list_head offload_base __read_mostly; |
1da177e4 | 166 | |
ae78dbfa | 167 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 | 168 | static int call_netdevice_notifiers_info(unsigned long val, |
54951194 | 169 | struct netdev_notifier_info *info); |
26372605 PM |
170 | static int call_netdevice_notifiers_extack(unsigned long val, |
171 | struct net_device *dev, | |
172 | struct netlink_ext_ack *extack); | |
90b602f8 | 173 | static struct napi_struct *napi_by_id(unsigned int napi_id); |
ae78dbfa | 174 | |
1da177e4 | 175 | /* |
7562f876 | 176 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
177 | * semaphore. |
178 | * | |
c6d14c84 | 179 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
180 | * |
181 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 182 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
183 | * actual updates. This allows pure readers to access the list even |
184 | * while a writer is preparing to update it. | |
185 | * | |
186 | * To put it another way, dev_base_lock is held for writing only to | |
187 | * protect against pure readers; the rtnl semaphore provides the | |
188 | * protection against other writers. | |
189 | * | |
190 | * See, for example usages, register_netdevice() and | |
191 | * unregister_netdevice(), which must be called with the rtnl | |
192 | * semaphore held. | |
193 | */ | |
1da177e4 | 194 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
195 | EXPORT_SYMBOL(dev_base_lock); |
196 | ||
6c557001 FW |
197 | static DEFINE_MUTEX(ifalias_mutex); |
198 | ||
af12fa6e ET |
199 | /* protects napi_hash addition/deletion and napi_gen_id */ |
200 | static DEFINE_SPINLOCK(napi_hash_lock); | |
201 | ||
52bd2d62 | 202 | static unsigned int napi_gen_id = NR_CPUS; |
6180d9de | 203 | static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
af12fa6e | 204 | |
11d6011c | 205 | static DECLARE_RWSEM(devnet_rename_sem); |
c91f6df2 | 206 | |
4e985ada TG |
207 | static inline void dev_base_seq_inc(struct net *net) |
208 | { | |
643aa9cb | 209 | while (++net->dev_base_seq == 0) |
210 | ; | |
4e985ada TG |
211 | } |
212 | ||
881d966b | 213 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 214 | { |
8387ff25 | 215 | unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
95c96174 | 216 | |
08e9897d | 217 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
218 | } |
219 | ||
881d966b | 220 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 221 | { |
7c28bd0b | 222 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
223 | } |
224 | ||
e36fa2f7 | 225 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
226 | { |
227 | #ifdef CONFIG_RPS | |
e36fa2f7 | 228 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
229 | #endif |
230 | } | |
231 | ||
e36fa2f7 | 232 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
233 | { |
234 | #ifdef CONFIG_RPS | |
e36fa2f7 | 235 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
236 | #endif |
237 | } | |
238 | ||
ff927412 JP |
239 | static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev, |
240 | const char *name) | |
241 | { | |
242 | struct netdev_name_node *name_node; | |
243 | ||
244 | name_node = kmalloc(sizeof(*name_node), GFP_KERNEL); | |
245 | if (!name_node) | |
246 | return NULL; | |
247 | INIT_HLIST_NODE(&name_node->hlist); | |
248 | name_node->dev = dev; | |
249 | name_node->name = name; | |
250 | return name_node; | |
251 | } | |
252 | ||
253 | static struct netdev_name_node * | |
254 | netdev_name_node_head_alloc(struct net_device *dev) | |
255 | { | |
36fbf1e5 JP |
256 | struct netdev_name_node *name_node; |
257 | ||
258 | name_node = netdev_name_node_alloc(dev, dev->name); | |
259 | if (!name_node) | |
260 | return NULL; | |
261 | INIT_LIST_HEAD(&name_node->list); | |
262 | return name_node; | |
ff927412 JP |
263 | } |
264 | ||
265 | static void netdev_name_node_free(struct netdev_name_node *name_node) | |
266 | { | |
267 | kfree(name_node); | |
268 | } | |
269 | ||
270 | static void netdev_name_node_add(struct net *net, | |
271 | struct netdev_name_node *name_node) | |
272 | { | |
273 | hlist_add_head_rcu(&name_node->hlist, | |
274 | dev_name_hash(net, name_node->name)); | |
275 | } | |
276 | ||
277 | static void netdev_name_node_del(struct netdev_name_node *name_node) | |
278 | { | |
279 | hlist_del_rcu(&name_node->hlist); | |
280 | } | |
281 | ||
282 | static struct netdev_name_node *netdev_name_node_lookup(struct net *net, | |
283 | const char *name) | |
284 | { | |
285 | struct hlist_head *head = dev_name_hash(net, name); | |
286 | struct netdev_name_node *name_node; | |
287 | ||
288 | hlist_for_each_entry(name_node, head, hlist) | |
289 | if (!strcmp(name_node->name, name)) | |
290 | return name_node; | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net, | |
295 | const char *name) | |
296 | { | |
297 | struct hlist_head *head = dev_name_hash(net, name); | |
298 | struct netdev_name_node *name_node; | |
299 | ||
300 | hlist_for_each_entry_rcu(name_node, head, hlist) | |
301 | if (!strcmp(name_node->name, name)) | |
302 | return name_node; | |
303 | return NULL; | |
304 | } | |
305 | ||
36fbf1e5 JP |
306 | int netdev_name_node_alt_create(struct net_device *dev, const char *name) |
307 | { | |
308 | struct netdev_name_node *name_node; | |
309 | struct net *net = dev_net(dev); | |
310 | ||
311 | name_node = netdev_name_node_lookup(net, name); | |
312 | if (name_node) | |
313 | return -EEXIST; | |
314 | name_node = netdev_name_node_alloc(dev, name); | |
315 | if (!name_node) | |
316 | return -ENOMEM; | |
317 | netdev_name_node_add(net, name_node); | |
318 | /* The node that holds dev->name acts as a head of per-device list. */ | |
319 | list_add_tail(&name_node->list, &dev->name_node->list); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | EXPORT_SYMBOL(netdev_name_node_alt_create); | |
324 | ||
325 | static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node) | |
326 | { | |
327 | list_del(&name_node->list); | |
328 | netdev_name_node_del(name_node); | |
329 | kfree(name_node->name); | |
330 | netdev_name_node_free(name_node); | |
331 | } | |
332 | ||
333 | int netdev_name_node_alt_destroy(struct net_device *dev, const char *name) | |
334 | { | |
335 | struct netdev_name_node *name_node; | |
336 | struct net *net = dev_net(dev); | |
337 | ||
338 | name_node = netdev_name_node_lookup(net, name); | |
339 | if (!name_node) | |
340 | return -ENOENT; | |
e08ad805 ED |
341 | /* lookup might have found our primary name or a name belonging |
342 | * to another device. | |
343 | */ | |
344 | if (name_node == dev->name_node || name_node->dev != dev) | |
345 | return -EINVAL; | |
346 | ||
36fbf1e5 JP |
347 | __netdev_name_node_alt_destroy(name_node); |
348 | ||
349 | return 0; | |
350 | } | |
351 | EXPORT_SYMBOL(netdev_name_node_alt_destroy); | |
352 | ||
353 | static void netdev_name_node_alt_flush(struct net_device *dev) | |
354 | { | |
355 | struct netdev_name_node *name_node, *tmp; | |
356 | ||
357 | list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list) | |
358 | __netdev_name_node_alt_destroy(name_node); | |
359 | } | |
360 | ||
ce286d32 | 361 | /* Device list insertion */ |
53759be9 | 362 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 363 | { |
c346dca1 | 364 | struct net *net = dev_net(dev); |
ce286d32 EB |
365 | |
366 | ASSERT_RTNL(); | |
367 | ||
368 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 369 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
ff927412 | 370 | netdev_name_node_add(net, dev->name_node); |
fb699dfd ED |
371 | hlist_add_head_rcu(&dev->index_hlist, |
372 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 373 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
374 | |
375 | dev_base_seq_inc(net); | |
ce286d32 EB |
376 | } |
377 | ||
fb699dfd ED |
378 | /* Device list removal |
379 | * caller must respect a RCU grace period before freeing/reusing dev | |
380 | */ | |
ce286d32 EB |
381 | static void unlist_netdevice(struct net_device *dev) |
382 | { | |
383 | ASSERT_RTNL(); | |
384 | ||
385 | /* Unlink dev from the device chain */ | |
386 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 387 | list_del_rcu(&dev->dev_list); |
ff927412 | 388 | netdev_name_node_del(dev->name_node); |
fb699dfd | 389 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 390 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
391 | |
392 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
393 | } |
394 | ||
1da177e4 LT |
395 | /* |
396 | * Our notifier list | |
397 | */ | |
398 | ||
f07d5b94 | 399 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
400 | |
401 | /* | |
402 | * Device drivers call our routines to queue packets here. We empty the | |
403 | * queue in the local softnet handler. | |
404 | */ | |
bea3348e | 405 | |
9958da05 | 406 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 407 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 408 | |
1a33e10e CW |
409 | #ifdef CONFIG_LOCKDEP |
410 | /* | |
411 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class | |
412 | * according to dev->type | |
413 | */ | |
414 | static const unsigned short netdev_lock_type[] = { | |
415 | ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
416 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
417 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
418 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
419 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
420 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
421 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
422 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
423 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
424 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
425 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
426 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
427 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, | |
428 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
429 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
430 | ||
431 | static const char *const netdev_lock_name[] = { | |
432 | "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
433 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
434 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
435 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
436 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
437 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
438 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
439 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
440 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
441 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
442 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
443 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
444 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", | |
445 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
446 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
447 | ||
448 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
845e0ebb | 449 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
1a33e10e CW |
450 | |
451 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
452 | { | |
453 | int i; | |
454 | ||
455 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
456 | if (netdev_lock_type[i] == dev_type) | |
457 | return i; | |
458 | /* the last key is used by default */ | |
459 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
460 | } | |
461 | ||
462 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, | |
463 | unsigned short dev_type) | |
464 | { | |
465 | int i; | |
466 | ||
467 | i = netdev_lock_pos(dev_type); | |
468 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
469 | netdev_lock_name[i]); | |
470 | } | |
845e0ebb CW |
471 | |
472 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
473 | { | |
474 | int i; | |
475 | ||
476 | i = netdev_lock_pos(dev->type); | |
477 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
478 | &netdev_addr_lock_key[i], | |
479 | netdev_lock_name[i]); | |
480 | } | |
1a33e10e CW |
481 | #else |
482 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, | |
483 | unsigned short dev_type) | |
484 | { | |
485 | } | |
845e0ebb CW |
486 | |
487 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
488 | { | |
489 | } | |
1a33e10e CW |
490 | #endif |
491 | ||
1da177e4 | 492 | /******************************************************************************* |
eb13da1a | 493 | * |
494 | * Protocol management and registration routines | |
495 | * | |
496 | *******************************************************************************/ | |
1da177e4 | 497 | |
1da177e4 | 498 | |
1da177e4 LT |
499 | /* |
500 | * Add a protocol ID to the list. Now that the input handler is | |
501 | * smarter we can dispense with all the messy stuff that used to be | |
502 | * here. | |
503 | * | |
504 | * BEWARE!!! Protocol handlers, mangling input packets, | |
505 | * MUST BE last in hash buckets and checking protocol handlers | |
506 | * MUST start from promiscuous ptype_all chain in net_bh. | |
507 | * It is true now, do not change it. | |
508 | * Explanation follows: if protocol handler, mangling packet, will | |
509 | * be the first on list, it is not able to sense, that packet | |
510 | * is cloned and should be copied-on-write, so that it will | |
511 | * change it and subsequent readers will get broken packet. | |
512 | * --ANK (980803) | |
513 | */ | |
514 | ||
c07b68e8 ED |
515 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
516 | { | |
517 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 518 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 519 | else |
7866a621 SN |
520 | return pt->dev ? &pt->dev->ptype_specific : |
521 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
522 | } |
523 | ||
1da177e4 LT |
524 | /** |
525 | * dev_add_pack - add packet handler | |
526 | * @pt: packet type declaration | |
527 | * | |
528 | * Add a protocol handler to the networking stack. The passed &packet_type | |
529 | * is linked into kernel lists and may not be freed until it has been | |
530 | * removed from the kernel lists. | |
531 | * | |
4ec93edb | 532 | * This call does not sleep therefore it can not |
1da177e4 LT |
533 | * guarantee all CPU's that are in middle of receiving packets |
534 | * will see the new packet type (until the next received packet). | |
535 | */ | |
536 | ||
537 | void dev_add_pack(struct packet_type *pt) | |
538 | { | |
c07b68e8 | 539 | struct list_head *head = ptype_head(pt); |
1da177e4 | 540 | |
c07b68e8 ED |
541 | spin_lock(&ptype_lock); |
542 | list_add_rcu(&pt->list, head); | |
543 | spin_unlock(&ptype_lock); | |
1da177e4 | 544 | } |
d1b19dff | 545 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 546 | |
1da177e4 LT |
547 | /** |
548 | * __dev_remove_pack - remove packet handler | |
549 | * @pt: packet type declaration | |
550 | * | |
551 | * Remove a protocol handler that was previously added to the kernel | |
552 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
553 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 554 | * returns. |
1da177e4 LT |
555 | * |
556 | * The packet type might still be in use by receivers | |
557 | * and must not be freed until after all the CPU's have gone | |
558 | * through a quiescent state. | |
559 | */ | |
560 | void __dev_remove_pack(struct packet_type *pt) | |
561 | { | |
c07b68e8 | 562 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
563 | struct packet_type *pt1; |
564 | ||
c07b68e8 | 565 | spin_lock(&ptype_lock); |
1da177e4 LT |
566 | |
567 | list_for_each_entry(pt1, head, list) { | |
568 | if (pt == pt1) { | |
569 | list_del_rcu(&pt->list); | |
570 | goto out; | |
571 | } | |
572 | } | |
573 | ||
7b6cd1ce | 574 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 575 | out: |
c07b68e8 | 576 | spin_unlock(&ptype_lock); |
1da177e4 | 577 | } |
d1b19dff ED |
578 | EXPORT_SYMBOL(__dev_remove_pack); |
579 | ||
1da177e4 LT |
580 | /** |
581 | * dev_remove_pack - remove packet handler | |
582 | * @pt: packet type declaration | |
583 | * | |
584 | * Remove a protocol handler that was previously added to the kernel | |
585 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
586 | * from the kernel lists and can be freed or reused once this function | |
587 | * returns. | |
588 | * | |
589 | * This call sleeps to guarantee that no CPU is looking at the packet | |
590 | * type after return. | |
591 | */ | |
592 | void dev_remove_pack(struct packet_type *pt) | |
593 | { | |
594 | __dev_remove_pack(pt); | |
4ec93edb | 595 | |
1da177e4 LT |
596 | synchronize_net(); |
597 | } | |
d1b19dff | 598 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 599 | |
62532da9 VY |
600 | |
601 | /** | |
602 | * dev_add_offload - register offload handlers | |
603 | * @po: protocol offload declaration | |
604 | * | |
605 | * Add protocol offload handlers to the networking stack. The passed | |
606 | * &proto_offload is linked into kernel lists and may not be freed until | |
607 | * it has been removed from the kernel lists. | |
608 | * | |
609 | * This call does not sleep therefore it can not | |
610 | * guarantee all CPU's that are in middle of receiving packets | |
611 | * will see the new offload handlers (until the next received packet). | |
612 | */ | |
613 | void dev_add_offload(struct packet_offload *po) | |
614 | { | |
bdef7de4 | 615 | struct packet_offload *elem; |
62532da9 VY |
616 | |
617 | spin_lock(&offload_lock); | |
bdef7de4 DM |
618 | list_for_each_entry(elem, &offload_base, list) { |
619 | if (po->priority < elem->priority) | |
620 | break; | |
621 | } | |
622 | list_add_rcu(&po->list, elem->list.prev); | |
62532da9 VY |
623 | spin_unlock(&offload_lock); |
624 | } | |
625 | EXPORT_SYMBOL(dev_add_offload); | |
626 | ||
627 | /** | |
628 | * __dev_remove_offload - remove offload handler | |
629 | * @po: packet offload declaration | |
630 | * | |
631 | * Remove a protocol offload handler that was previously added to the | |
632 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
633 | * is removed from the kernel lists and can be freed or reused once this | |
634 | * function returns. | |
635 | * | |
636 | * The packet type might still be in use by receivers | |
637 | * and must not be freed until after all the CPU's have gone | |
638 | * through a quiescent state. | |
639 | */ | |
1d143d9f | 640 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
641 | { |
642 | struct list_head *head = &offload_base; | |
643 | struct packet_offload *po1; | |
644 | ||
c53aa505 | 645 | spin_lock(&offload_lock); |
62532da9 VY |
646 | |
647 | list_for_each_entry(po1, head, list) { | |
648 | if (po == po1) { | |
649 | list_del_rcu(&po->list); | |
650 | goto out; | |
651 | } | |
652 | } | |
653 | ||
654 | pr_warn("dev_remove_offload: %p not found\n", po); | |
655 | out: | |
c53aa505 | 656 | spin_unlock(&offload_lock); |
62532da9 | 657 | } |
62532da9 VY |
658 | |
659 | /** | |
660 | * dev_remove_offload - remove packet offload handler | |
661 | * @po: packet offload declaration | |
662 | * | |
663 | * Remove a packet offload handler that was previously added to the kernel | |
664 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
665 | * removed from the kernel lists and can be freed or reused once this | |
666 | * function returns. | |
667 | * | |
668 | * This call sleeps to guarantee that no CPU is looking at the packet | |
669 | * type after return. | |
670 | */ | |
671 | void dev_remove_offload(struct packet_offload *po) | |
672 | { | |
673 | __dev_remove_offload(po); | |
674 | ||
675 | synchronize_net(); | |
676 | } | |
677 | EXPORT_SYMBOL(dev_remove_offload); | |
678 | ||
1da177e4 | 679 | /****************************************************************************** |
eb13da1a | 680 | * |
681 | * Device Boot-time Settings Routines | |
682 | * | |
683 | ******************************************************************************/ | |
1da177e4 LT |
684 | |
685 | /* Boot time configuration table */ | |
686 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
687 | ||
688 | /** | |
689 | * netdev_boot_setup_add - add new setup entry | |
690 | * @name: name of the device | |
691 | * @map: configured settings for the device | |
692 | * | |
693 | * Adds new setup entry to the dev_boot_setup list. The function | |
694 | * returns 0 on error and 1 on success. This is a generic routine to | |
695 | * all netdevices. | |
696 | */ | |
697 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
698 | { | |
699 | struct netdev_boot_setup *s; | |
700 | int i; | |
701 | ||
702 | s = dev_boot_setup; | |
703 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
704 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
705 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 706 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
707 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
708 | break; | |
709 | } | |
710 | } | |
711 | ||
712 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
713 | } | |
714 | ||
715 | /** | |
722c9a0c | 716 | * netdev_boot_setup_check - check boot time settings |
717 | * @dev: the netdevice | |
1da177e4 | 718 | * |
722c9a0c | 719 | * Check boot time settings for the device. |
720 | * The found settings are set for the device to be used | |
721 | * later in the device probing. | |
722 | * Returns 0 if no settings found, 1 if they are. | |
1da177e4 LT |
723 | */ |
724 | int netdev_boot_setup_check(struct net_device *dev) | |
725 | { | |
726 | struct netdev_boot_setup *s = dev_boot_setup; | |
727 | int i; | |
728 | ||
729 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
730 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 731 | !strcmp(dev->name, s[i].name)) { |
722c9a0c | 732 | dev->irq = s[i].map.irq; |
733 | dev->base_addr = s[i].map.base_addr; | |
734 | dev->mem_start = s[i].map.mem_start; | |
735 | dev->mem_end = s[i].map.mem_end; | |
1da177e4 LT |
736 | return 1; |
737 | } | |
738 | } | |
739 | return 0; | |
740 | } | |
d1b19dff | 741 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
742 | |
743 | ||
744 | /** | |
722c9a0c | 745 | * netdev_boot_base - get address from boot time settings |
746 | * @prefix: prefix for network device | |
747 | * @unit: id for network device | |
748 | * | |
749 | * Check boot time settings for the base address of device. | |
750 | * The found settings are set for the device to be used | |
751 | * later in the device probing. | |
752 | * Returns 0 if no settings found. | |
1da177e4 LT |
753 | */ |
754 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
755 | { | |
756 | const struct netdev_boot_setup *s = dev_boot_setup; | |
757 | char name[IFNAMSIZ]; | |
758 | int i; | |
759 | ||
760 | sprintf(name, "%s%d", prefix, unit); | |
761 | ||
762 | /* | |
763 | * If device already registered then return base of 1 | |
764 | * to indicate not to probe for this interface | |
765 | */ | |
881d966b | 766 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
767 | return 1; |
768 | ||
769 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
770 | if (!strcmp(name, s[i].name)) | |
771 | return s[i].map.base_addr; | |
772 | return 0; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Saves at boot time configured settings for any netdevice. | |
777 | */ | |
778 | int __init netdev_boot_setup(char *str) | |
779 | { | |
780 | int ints[5]; | |
781 | struct ifmap map; | |
782 | ||
783 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
784 | if (!str || !*str) | |
785 | return 0; | |
786 | ||
787 | /* Save settings */ | |
788 | memset(&map, 0, sizeof(map)); | |
789 | if (ints[0] > 0) | |
790 | map.irq = ints[1]; | |
791 | if (ints[0] > 1) | |
792 | map.base_addr = ints[2]; | |
793 | if (ints[0] > 2) | |
794 | map.mem_start = ints[3]; | |
795 | if (ints[0] > 3) | |
796 | map.mem_end = ints[4]; | |
797 | ||
798 | /* Add new entry to the list */ | |
799 | return netdev_boot_setup_add(str, &map); | |
800 | } | |
801 | ||
802 | __setup("netdev=", netdev_boot_setup); | |
803 | ||
804 | /******************************************************************************* | |
eb13da1a | 805 | * |
806 | * Device Interface Subroutines | |
807 | * | |
808 | *******************************************************************************/ | |
1da177e4 | 809 | |
a54acb3a ND |
810 | /** |
811 | * dev_get_iflink - get 'iflink' value of a interface | |
812 | * @dev: targeted interface | |
813 | * | |
814 | * Indicates the ifindex the interface is linked to. | |
815 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
816 | */ | |
817 | ||
818 | int dev_get_iflink(const struct net_device *dev) | |
819 | { | |
820 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
821 | return dev->netdev_ops->ndo_get_iflink(dev); | |
822 | ||
7a66bbc9 | 823 | return dev->ifindex; |
a54acb3a ND |
824 | } |
825 | EXPORT_SYMBOL(dev_get_iflink); | |
826 | ||
fc4099f1 PS |
827 | /** |
828 | * dev_fill_metadata_dst - Retrieve tunnel egress information. | |
829 | * @dev: targeted interface | |
830 | * @skb: The packet. | |
831 | * | |
832 | * For better visibility of tunnel traffic OVS needs to retrieve | |
833 | * egress tunnel information for a packet. Following API allows | |
834 | * user to get this info. | |
835 | */ | |
836 | int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
837 | { | |
838 | struct ip_tunnel_info *info; | |
839 | ||
840 | if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) | |
841 | return -EINVAL; | |
842 | ||
843 | info = skb_tunnel_info_unclone(skb); | |
844 | if (!info) | |
845 | return -ENOMEM; | |
846 | if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) | |
847 | return -EINVAL; | |
848 | ||
849 | return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); | |
852 | ||
ddb94eaf PNA |
853 | static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack) |
854 | { | |
855 | int k = stack->num_paths++; | |
856 | ||
857 | if (WARN_ON_ONCE(k >= NET_DEVICE_PATH_STACK_MAX)) | |
858 | return NULL; | |
859 | ||
860 | return &stack->path[k]; | |
861 | } | |
862 | ||
863 | int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, | |
864 | struct net_device_path_stack *stack) | |
865 | { | |
866 | const struct net_device *last_dev; | |
867 | struct net_device_path_ctx ctx = { | |
868 | .dev = dev, | |
869 | .daddr = daddr, | |
870 | }; | |
871 | struct net_device_path *path; | |
872 | int ret = 0; | |
873 | ||
874 | stack->num_paths = 0; | |
875 | while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) { | |
876 | last_dev = ctx.dev; | |
877 | path = dev_fwd_path(stack); | |
878 | if (!path) | |
879 | return -1; | |
880 | ||
881 | memset(path, 0, sizeof(struct net_device_path)); | |
882 | ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path); | |
883 | if (ret < 0) | |
884 | return -1; | |
885 | ||
886 | if (WARN_ON_ONCE(last_dev == ctx.dev)) | |
887 | return -1; | |
888 | } | |
889 | path = dev_fwd_path(stack); | |
890 | if (!path) | |
891 | return -1; | |
892 | path->type = DEV_PATH_ETHERNET; | |
893 | path->dev = ctx.dev; | |
894 | ||
895 | return ret; | |
896 | } | |
897 | EXPORT_SYMBOL_GPL(dev_fill_forward_path); | |
898 | ||
1da177e4 LT |
899 | /** |
900 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 901 | * @net: the applicable net namespace |
1da177e4 LT |
902 | * @name: name to find |
903 | * | |
904 | * Find an interface by name. Must be called under RTNL semaphore | |
905 | * or @dev_base_lock. If the name is found a pointer to the device | |
906 | * is returned. If the name is not found then %NULL is returned. The | |
907 | * reference counters are not incremented so the caller must be | |
908 | * careful with locks. | |
909 | */ | |
910 | ||
881d966b | 911 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 912 | { |
ff927412 | 913 | struct netdev_name_node *node_name; |
1da177e4 | 914 | |
ff927412 JP |
915 | node_name = netdev_name_node_lookup(net, name); |
916 | return node_name ? node_name->dev : NULL; | |
1da177e4 | 917 | } |
d1b19dff | 918 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 919 | |
72c9528b | 920 | /** |
722c9a0c | 921 | * dev_get_by_name_rcu - find a device by its name |
922 | * @net: the applicable net namespace | |
923 | * @name: name to find | |
924 | * | |
925 | * Find an interface by name. | |
926 | * If the name is found a pointer to the device is returned. | |
927 | * If the name is not found then %NULL is returned. | |
928 | * The reference counters are not incremented so the caller must be | |
929 | * careful with locks. The caller must hold RCU lock. | |
72c9528b ED |
930 | */ |
931 | ||
932 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
933 | { | |
ff927412 | 934 | struct netdev_name_node *node_name; |
72c9528b | 935 | |
ff927412 JP |
936 | node_name = netdev_name_node_lookup_rcu(net, name); |
937 | return node_name ? node_name->dev : NULL; | |
72c9528b ED |
938 | } |
939 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
940 | ||
1da177e4 LT |
941 | /** |
942 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 943 | * @net: the applicable net namespace |
1da177e4 LT |
944 | * @name: name to find |
945 | * | |
946 | * Find an interface by name. This can be called from any | |
947 | * context and does its own locking. The returned handle has | |
948 | * the usage count incremented and the caller must use dev_put() to | |
949 | * release it when it is no longer needed. %NULL is returned if no | |
950 | * matching device is found. | |
951 | */ | |
952 | ||
881d966b | 953 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
954 | { |
955 | struct net_device *dev; | |
956 | ||
72c9528b ED |
957 | rcu_read_lock(); |
958 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
959 | if (dev) |
960 | dev_hold(dev); | |
72c9528b | 961 | rcu_read_unlock(); |
1da177e4 LT |
962 | return dev; |
963 | } | |
d1b19dff | 964 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
965 | |
966 | /** | |
967 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 968 | * @net: the applicable net namespace |
1da177e4 LT |
969 | * @ifindex: index of device |
970 | * | |
971 | * Search for an interface by index. Returns %NULL if the device | |
972 | * is not found or a pointer to the device. The device has not | |
973 | * had its reference counter increased so the caller must be careful | |
974 | * about locking. The caller must hold either the RTNL semaphore | |
975 | * or @dev_base_lock. | |
976 | */ | |
977 | ||
881d966b | 978 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 979 | { |
0bd8d536 ED |
980 | struct net_device *dev; |
981 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 982 | |
b67bfe0d | 983 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
984 | if (dev->ifindex == ifindex) |
985 | return dev; | |
0bd8d536 | 986 | |
1da177e4 LT |
987 | return NULL; |
988 | } | |
d1b19dff | 989 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 990 | |
fb699dfd ED |
991 | /** |
992 | * dev_get_by_index_rcu - find a device by its ifindex | |
993 | * @net: the applicable net namespace | |
994 | * @ifindex: index of device | |
995 | * | |
996 | * Search for an interface by index. Returns %NULL if the device | |
997 | * is not found or a pointer to the device. The device has not | |
998 | * had its reference counter increased so the caller must be careful | |
999 | * about locking. The caller must hold RCU lock. | |
1000 | */ | |
1001 | ||
1002 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
1003 | { | |
fb699dfd ED |
1004 | struct net_device *dev; |
1005 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1006 | ||
b67bfe0d | 1007 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
1008 | if (dev->ifindex == ifindex) |
1009 | return dev; | |
1010 | ||
1011 | return NULL; | |
1012 | } | |
1013 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
1014 | ||
1da177e4 LT |
1015 | |
1016 | /** | |
1017 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 1018 | * @net: the applicable net namespace |
1da177e4 LT |
1019 | * @ifindex: index of device |
1020 | * | |
1021 | * Search for an interface by index. Returns NULL if the device | |
1022 | * is not found or a pointer to the device. The device returned has | |
1023 | * had a reference added and the pointer is safe until the user calls | |
1024 | * dev_put to indicate they have finished with it. | |
1025 | */ | |
1026 | ||
881d966b | 1027 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
1028 | { |
1029 | struct net_device *dev; | |
1030 | ||
fb699dfd ED |
1031 | rcu_read_lock(); |
1032 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
1033 | if (dev) |
1034 | dev_hold(dev); | |
fb699dfd | 1035 | rcu_read_unlock(); |
1da177e4 LT |
1036 | return dev; |
1037 | } | |
d1b19dff | 1038 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 1039 | |
90b602f8 ML |
1040 | /** |
1041 | * dev_get_by_napi_id - find a device by napi_id | |
1042 | * @napi_id: ID of the NAPI struct | |
1043 | * | |
1044 | * Search for an interface by NAPI ID. Returns %NULL if the device | |
1045 | * is not found or a pointer to the device. The device has not had | |
1046 | * its reference counter increased so the caller must be careful | |
1047 | * about locking. The caller must hold RCU lock. | |
1048 | */ | |
1049 | ||
1050 | struct net_device *dev_get_by_napi_id(unsigned int napi_id) | |
1051 | { | |
1052 | struct napi_struct *napi; | |
1053 | ||
1054 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1055 | ||
1056 | if (napi_id < MIN_NAPI_ID) | |
1057 | return NULL; | |
1058 | ||
1059 | napi = napi_by_id(napi_id); | |
1060 | ||
1061 | return napi ? napi->dev : NULL; | |
1062 | } | |
1063 | EXPORT_SYMBOL(dev_get_by_napi_id); | |
1064 | ||
5dbe7c17 NS |
1065 | /** |
1066 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
1067 | * @net: network namespace | |
1068 | * @name: a pointer to the buffer where the name will be stored. | |
1069 | * @ifindex: the ifindex of the interface to get the name from. | |
5dbe7c17 NS |
1070 | */ |
1071 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
1072 | { | |
1073 | struct net_device *dev; | |
11d6011c | 1074 | int ret; |
5dbe7c17 | 1075 | |
11d6011c | 1076 | down_read(&devnet_rename_sem); |
5dbe7c17 | 1077 | rcu_read_lock(); |
11d6011c | 1078 | |
5dbe7c17 NS |
1079 | dev = dev_get_by_index_rcu(net, ifindex); |
1080 | if (!dev) { | |
11d6011c AD |
1081 | ret = -ENODEV; |
1082 | goto out; | |
5dbe7c17 NS |
1083 | } |
1084 | ||
1085 | strcpy(name, dev->name); | |
5dbe7c17 | 1086 | |
11d6011c AD |
1087 | ret = 0; |
1088 | out: | |
1089 | rcu_read_unlock(); | |
1090 | up_read(&devnet_rename_sem); | |
1091 | return ret; | |
5dbe7c17 NS |
1092 | } |
1093 | ||
1da177e4 | 1094 | /** |
941666c2 | 1095 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 1096 | * @net: the applicable net namespace |
1da177e4 LT |
1097 | * @type: media type of device |
1098 | * @ha: hardware address | |
1099 | * | |
1100 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
1101 | * is not found or a pointer to the device. |
1102 | * The caller must hold RCU or RTNL. | |
941666c2 | 1103 | * The returned device has not had its ref count increased |
1da177e4 LT |
1104 | * and the caller must therefore be careful about locking |
1105 | * | |
1da177e4 LT |
1106 | */ |
1107 | ||
941666c2 ED |
1108 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
1109 | const char *ha) | |
1da177e4 LT |
1110 | { |
1111 | struct net_device *dev; | |
1112 | ||
941666c2 | 1113 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
1114 | if (dev->type == type && |
1115 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
1116 | return dev; |
1117 | ||
1118 | return NULL; | |
1da177e4 | 1119 | } |
941666c2 | 1120 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 1121 | |
881d966b | 1122 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 1123 | { |
99fe3c39 | 1124 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 1125 | |
99fe3c39 ED |
1126 | rcu_read_lock(); |
1127 | for_each_netdev_rcu(net, dev) | |
1128 | if (dev->type == type) { | |
1129 | dev_hold(dev); | |
1130 | ret = dev; | |
1131 | break; | |
1132 | } | |
1133 | rcu_read_unlock(); | |
1134 | return ret; | |
1da177e4 | 1135 | } |
1da177e4 LT |
1136 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
1137 | ||
1138 | /** | |
6c555490 | 1139 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 1140 | * @net: the applicable net namespace |
1da177e4 LT |
1141 | * @if_flags: IFF_* values |
1142 | * @mask: bitmask of bits in if_flags to check | |
1143 | * | |
1144 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 1145 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 1146 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
1147 | */ |
1148 | ||
6c555490 WC |
1149 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
1150 | unsigned short mask) | |
1da177e4 | 1151 | { |
7562f876 | 1152 | struct net_device *dev, *ret; |
1da177e4 | 1153 | |
6c555490 WC |
1154 | ASSERT_RTNL(); |
1155 | ||
7562f876 | 1156 | ret = NULL; |
6c555490 | 1157 | for_each_netdev(net, dev) { |
1da177e4 | 1158 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 1159 | ret = dev; |
1da177e4 LT |
1160 | break; |
1161 | } | |
1162 | } | |
7562f876 | 1163 | return ret; |
1da177e4 | 1164 | } |
6c555490 | 1165 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
1166 | |
1167 | /** | |
1168 | * dev_valid_name - check if name is okay for network device | |
1169 | * @name: name string | |
1170 | * | |
1171 | * Network device names need to be valid file names to | |
4250b75b | 1172 | * allow sysfs to work. We also disallow any kind of |
c7fa9d18 | 1173 | * whitespace. |
1da177e4 | 1174 | */ |
95f050bf | 1175 | bool dev_valid_name(const char *name) |
1da177e4 | 1176 | { |
c7fa9d18 | 1177 | if (*name == '\0') |
95f050bf | 1178 | return false; |
a9d48205 | 1179 | if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) |
95f050bf | 1180 | return false; |
c7fa9d18 | 1181 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 1182 | return false; |
c7fa9d18 DM |
1183 | |
1184 | while (*name) { | |
a4176a93 | 1185 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 1186 | return false; |
c7fa9d18 DM |
1187 | name++; |
1188 | } | |
95f050bf | 1189 | return true; |
1da177e4 | 1190 | } |
d1b19dff | 1191 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
1192 | |
1193 | /** | |
b267b179 EB |
1194 | * __dev_alloc_name - allocate a name for a device |
1195 | * @net: network namespace to allocate the device name in | |
1da177e4 | 1196 | * @name: name format string |
b267b179 | 1197 | * @buf: scratch buffer and result name string |
1da177e4 LT |
1198 | * |
1199 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
1200 | * id. It scans list of devices to build up a free map, then chooses |
1201 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1202 | * while allocating the name and adding the device in order to avoid | |
1203 | * duplicates. | |
1204 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1205 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
1206 | */ |
1207 | ||
b267b179 | 1208 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
1209 | { |
1210 | int i = 0; | |
1da177e4 LT |
1211 | const char *p; |
1212 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 1213 | unsigned long *inuse; |
1da177e4 LT |
1214 | struct net_device *d; |
1215 | ||
93809105 RV |
1216 | if (!dev_valid_name(name)) |
1217 | return -EINVAL; | |
1218 | ||
51f299dd | 1219 | p = strchr(name, '%'); |
1da177e4 LT |
1220 | if (p) { |
1221 | /* | |
1222 | * Verify the string as this thing may have come from | |
1223 | * the user. There must be either one "%d" and no other "%" | |
1224 | * characters. | |
1225 | */ | |
1226 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1227 | return -EINVAL; | |
1228 | ||
1229 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 1230 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
1231 | if (!inuse) |
1232 | return -ENOMEM; | |
1233 | ||
881d966b | 1234 | for_each_netdev(net, d) { |
6c015a22 JB |
1235 | struct netdev_name_node *name_node; |
1236 | list_for_each_entry(name_node, &d->name_node->list, list) { | |
1237 | if (!sscanf(name_node->name, name, &i)) | |
1238 | continue; | |
1239 | if (i < 0 || i >= max_netdevices) | |
1240 | continue; | |
1241 | ||
1242 | /* avoid cases where sscanf is not exact inverse of printf */ | |
1243 | snprintf(buf, IFNAMSIZ, name, i); | |
1244 | if (!strncmp(buf, name_node->name, IFNAMSIZ)) | |
1245 | set_bit(i, inuse); | |
1246 | } | |
1da177e4 LT |
1247 | if (!sscanf(d->name, name, &i)) |
1248 | continue; | |
1249 | if (i < 0 || i >= max_netdevices) | |
1250 | continue; | |
1251 | ||
1252 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1253 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1254 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1255 | set_bit(i, inuse); | |
1256 | } | |
1257 | ||
1258 | i = find_first_zero_bit(inuse, max_netdevices); | |
1259 | free_page((unsigned long) inuse); | |
1260 | } | |
1261 | ||
6224abda | 1262 | snprintf(buf, IFNAMSIZ, name, i); |
b267b179 | 1263 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1264 | return i; |
1da177e4 LT |
1265 | |
1266 | /* It is possible to run out of possible slots | |
1267 | * when the name is long and there isn't enough space left | |
1268 | * for the digits, or if all bits are used. | |
1269 | */ | |
029b6d14 | 1270 | return -ENFILE; |
1da177e4 LT |
1271 | } |
1272 | ||
2c88b855 RV |
1273 | static int dev_alloc_name_ns(struct net *net, |
1274 | struct net_device *dev, | |
1275 | const char *name) | |
1276 | { | |
1277 | char buf[IFNAMSIZ]; | |
1278 | int ret; | |
1279 | ||
c46d7642 | 1280 | BUG_ON(!net); |
2c88b855 RV |
1281 | ret = __dev_alloc_name(net, name, buf); |
1282 | if (ret >= 0) | |
1283 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1284 | return ret; | |
1da177e4 LT |
1285 | } |
1286 | ||
b267b179 EB |
1287 | /** |
1288 | * dev_alloc_name - allocate a name for a device | |
1289 | * @dev: device | |
1290 | * @name: name format string | |
1291 | * | |
1292 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1293 | * id. It scans list of devices to build up a free map, then chooses | |
1294 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1295 | * while allocating the name and adding the device in order to avoid | |
1296 | * duplicates. | |
1297 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1298 | * Returns the number of the unit assigned or a negative errno code. | |
1299 | */ | |
1300 | ||
1301 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1302 | { | |
c46d7642 | 1303 | return dev_alloc_name_ns(dev_net(dev), dev, name); |
b267b179 | 1304 | } |
d1b19dff | 1305 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1306 | |
bacb7e18 ED |
1307 | static int dev_get_valid_name(struct net *net, struct net_device *dev, |
1308 | const char *name) | |
828de4f6 | 1309 | { |
55a5ec9b DM |
1310 | BUG_ON(!net); |
1311 | ||
1312 | if (!dev_valid_name(name)) | |
1313 | return -EINVAL; | |
1314 | ||
1315 | if (strchr(name, '%')) | |
1316 | return dev_alloc_name_ns(net, dev, name); | |
1317 | else if (__dev_get_by_name(net, name)) | |
1318 | return -EEXIST; | |
1319 | else if (dev->name != name) | |
1320 | strlcpy(dev->name, name, IFNAMSIZ); | |
1321 | ||
1322 | return 0; | |
d9031024 | 1323 | } |
1da177e4 LT |
1324 | |
1325 | /** | |
1326 | * dev_change_name - change name of a device | |
1327 | * @dev: device | |
1328 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1329 | * | |
1330 | * Change name of a device, can pass format strings "eth%d". | |
1331 | * for wildcarding. | |
1332 | */ | |
cf04a4c7 | 1333 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1334 | { |
238fa362 | 1335 | unsigned char old_assign_type; |
fcc5a03a | 1336 | char oldname[IFNAMSIZ]; |
1da177e4 | 1337 | int err = 0; |
fcc5a03a | 1338 | int ret; |
881d966b | 1339 | struct net *net; |
1da177e4 LT |
1340 | |
1341 | ASSERT_RTNL(); | |
c346dca1 | 1342 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1343 | |
c346dca1 | 1344 | net = dev_net(dev); |
8065a779 SWL |
1345 | |
1346 | /* Some auto-enslaved devices e.g. failover slaves are | |
1347 | * special, as userspace might rename the device after | |
1348 | * the interface had been brought up and running since | |
1349 | * the point kernel initiated auto-enslavement. Allow | |
1350 | * live name change even when these slave devices are | |
1351 | * up and running. | |
1352 | * | |
1353 | * Typically, users of these auto-enslaving devices | |
1354 | * don't actually care about slave name change, as | |
1355 | * they are supposed to operate on master interface | |
1356 | * directly. | |
1357 | */ | |
1358 | if (dev->flags & IFF_UP && | |
1359 | likely(!(dev->priv_flags & IFF_LIVE_RENAME_OK))) | |
1da177e4 LT |
1360 | return -EBUSY; |
1361 | ||
11d6011c | 1362 | down_write(&devnet_rename_sem); |
c91f6df2 BH |
1363 | |
1364 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
11d6011c | 1365 | up_write(&devnet_rename_sem); |
c8d90dca | 1366 | return 0; |
c91f6df2 | 1367 | } |
c8d90dca | 1368 | |
fcc5a03a HX |
1369 | memcpy(oldname, dev->name, IFNAMSIZ); |
1370 | ||
828de4f6 | 1371 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1372 | if (err < 0) { |
11d6011c | 1373 | up_write(&devnet_rename_sem); |
d9031024 | 1374 | return err; |
c91f6df2 | 1375 | } |
1da177e4 | 1376 | |
6fe82a39 VF |
1377 | if (oldname[0] && !strchr(oldname, '%')) |
1378 | netdev_info(dev, "renamed from %s\n", oldname); | |
1379 | ||
238fa362 TG |
1380 | old_assign_type = dev->name_assign_type; |
1381 | dev->name_assign_type = NET_NAME_RENAMED; | |
1382 | ||
fcc5a03a | 1383 | rollback: |
a1b3f594 EB |
1384 | ret = device_rename(&dev->dev, dev->name); |
1385 | if (ret) { | |
1386 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1387 | dev->name_assign_type = old_assign_type; |
11d6011c | 1388 | up_write(&devnet_rename_sem); |
a1b3f594 | 1389 | return ret; |
dcc99773 | 1390 | } |
7f988eab | 1391 | |
11d6011c | 1392 | up_write(&devnet_rename_sem); |
c91f6df2 | 1393 | |
5bb025fa VF |
1394 | netdev_adjacent_rename_links(dev, oldname); |
1395 | ||
7f988eab | 1396 | write_lock_bh(&dev_base_lock); |
ff927412 | 1397 | netdev_name_node_del(dev->name_node); |
72c9528b ED |
1398 | write_unlock_bh(&dev_base_lock); |
1399 | ||
1400 | synchronize_rcu(); | |
1401 | ||
1402 | write_lock_bh(&dev_base_lock); | |
ff927412 | 1403 | netdev_name_node_add(net, dev->name_node); |
7f988eab HX |
1404 | write_unlock_bh(&dev_base_lock); |
1405 | ||
056925ab | 1406 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1407 | ret = notifier_to_errno(ret); |
1408 | ||
1409 | if (ret) { | |
91e9c07b ED |
1410 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1411 | if (err >= 0) { | |
fcc5a03a | 1412 | err = ret; |
11d6011c | 1413 | down_write(&devnet_rename_sem); |
fcc5a03a | 1414 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1415 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1416 | dev->name_assign_type = old_assign_type; |
1417 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1418 | goto rollback; |
91e9c07b | 1419 | } else { |
7b6cd1ce | 1420 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1421 | dev->name, ret); |
fcc5a03a HX |
1422 | } |
1423 | } | |
1da177e4 LT |
1424 | |
1425 | return err; | |
1426 | } | |
1427 | ||
0b815a1a SH |
1428 | /** |
1429 | * dev_set_alias - change ifalias of a device | |
1430 | * @dev: device | |
1431 | * @alias: name up to IFALIASZ | |
f0db275a | 1432 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1433 | * |
1434 | * Set ifalias for a device, | |
1435 | */ | |
1436 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1437 | { | |
6c557001 | 1438 | struct dev_ifalias *new_alias = NULL; |
0b815a1a SH |
1439 | |
1440 | if (len >= IFALIASZ) | |
1441 | return -EINVAL; | |
1442 | ||
6c557001 FW |
1443 | if (len) { |
1444 | new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); | |
1445 | if (!new_alias) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | memcpy(new_alias->ifalias, alias, len); | |
1449 | new_alias->ifalias[len] = 0; | |
96ca4a2c OH |
1450 | } |
1451 | ||
6c557001 | 1452 | mutex_lock(&ifalias_mutex); |
e3f0d761 PM |
1453 | new_alias = rcu_replace_pointer(dev->ifalias, new_alias, |
1454 | mutex_is_locked(&ifalias_mutex)); | |
6c557001 FW |
1455 | mutex_unlock(&ifalias_mutex); |
1456 | ||
1457 | if (new_alias) | |
1458 | kfree_rcu(new_alias, rcuhead); | |
0b815a1a | 1459 | |
0b815a1a SH |
1460 | return len; |
1461 | } | |
0fe554a4 | 1462 | EXPORT_SYMBOL(dev_set_alias); |
0b815a1a | 1463 | |
6c557001 FW |
1464 | /** |
1465 | * dev_get_alias - get ifalias of a device | |
1466 | * @dev: device | |
20e88320 | 1467 | * @name: buffer to store name of ifalias |
6c557001 FW |
1468 | * @len: size of buffer |
1469 | * | |
1470 | * get ifalias for a device. Caller must make sure dev cannot go | |
1471 | * away, e.g. rcu read lock or own a reference count to device. | |
1472 | */ | |
1473 | int dev_get_alias(const struct net_device *dev, char *name, size_t len) | |
1474 | { | |
1475 | const struct dev_ifalias *alias; | |
1476 | int ret = 0; | |
1477 | ||
1478 | rcu_read_lock(); | |
1479 | alias = rcu_dereference(dev->ifalias); | |
1480 | if (alias) | |
1481 | ret = snprintf(name, len, "%s", alias->ifalias); | |
1482 | rcu_read_unlock(); | |
1483 | ||
1484 | return ret; | |
1485 | } | |
0b815a1a | 1486 | |
d8a33ac4 | 1487 | /** |
3041a069 | 1488 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1489 | * @dev: device to cause notification |
1490 | * | |
1491 | * Called to indicate a device has changed features. | |
1492 | */ | |
1493 | void netdev_features_change(struct net_device *dev) | |
1494 | { | |
056925ab | 1495 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1496 | } |
1497 | EXPORT_SYMBOL(netdev_features_change); | |
1498 | ||
1da177e4 LT |
1499 | /** |
1500 | * netdev_state_change - device changes state | |
1501 | * @dev: device to cause notification | |
1502 | * | |
1503 | * Called to indicate a device has changed state. This function calls | |
1504 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1505 | * to the routing socket. | |
1506 | */ | |
1507 | void netdev_state_change(struct net_device *dev) | |
1508 | { | |
1509 | if (dev->flags & IFF_UP) { | |
51d0c047 DA |
1510 | struct netdev_notifier_change_info change_info = { |
1511 | .info.dev = dev, | |
1512 | }; | |
54951194 | 1513 | |
51d0c047 | 1514 | call_netdevice_notifiers_info(NETDEV_CHANGE, |
54951194 | 1515 | &change_info.info); |
7f294054 | 1516 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1517 | } |
1518 | } | |
d1b19dff | 1519 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1520 | |
7061eb8c LP |
1521 | /** |
1522 | * __netdev_notify_peers - notify network peers about existence of @dev, | |
1523 | * to be called when rtnl lock is already held. | |
1524 | * @dev: network device | |
1525 | * | |
1526 | * Generate traffic such that interested network peers are aware of | |
1527 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1528 | * a device wants to inform the rest of the network about some sort of | |
1529 | * reconfiguration such as a failover event or virtual machine | |
1530 | * migration. | |
1531 | */ | |
1532 | void __netdev_notify_peers(struct net_device *dev) | |
1533 | { | |
1534 | ASSERT_RTNL(); | |
1535 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
1536 | call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); | |
1537 | } | |
1538 | EXPORT_SYMBOL(__netdev_notify_peers); | |
1539 | ||
ee89bab1 | 1540 | /** |
722c9a0c | 1541 | * netdev_notify_peers - notify network peers about existence of @dev |
1542 | * @dev: network device | |
ee89bab1 AW |
1543 | * |
1544 | * Generate traffic such that interested network peers are aware of | |
1545 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1546 | * a device wants to inform the rest of the network about some sort of | |
1547 | * reconfiguration such as a failover event or virtual machine | |
1548 | * migration. | |
1549 | */ | |
1550 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1551 | { |
ee89bab1 | 1552 | rtnl_lock(); |
7061eb8c | 1553 | __netdev_notify_peers(dev); |
ee89bab1 | 1554 | rtnl_unlock(); |
c1da4ac7 | 1555 | } |
ee89bab1 | 1556 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1557 | |
29863d41 WW |
1558 | static int napi_threaded_poll(void *data); |
1559 | ||
1560 | static int napi_kthread_create(struct napi_struct *n) | |
1561 | { | |
1562 | int err = 0; | |
1563 | ||
1564 | /* Create and wake up the kthread once to put it in | |
1565 | * TASK_INTERRUPTIBLE mode to avoid the blocked task | |
1566 | * warning and work with loadavg. | |
1567 | */ | |
1568 | n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d", | |
1569 | n->dev->name, n->napi_id); | |
1570 | if (IS_ERR(n->thread)) { | |
1571 | err = PTR_ERR(n->thread); | |
1572 | pr_err("kthread_run failed with err %d\n", err); | |
1573 | n->thread = NULL; | |
1574 | } | |
1575 | ||
1576 | return err; | |
1577 | } | |
1578 | ||
40c900aa | 1579 | static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
1da177e4 | 1580 | { |
d314774c | 1581 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1582 | int ret; |
1da177e4 | 1583 | |
e46b66bc BH |
1584 | ASSERT_RTNL(); |
1585 | ||
bd869245 HK |
1586 | if (!netif_device_present(dev)) { |
1587 | /* may be detached because parent is runtime-suspended */ | |
1588 | if (dev->dev.parent) | |
1589 | pm_runtime_resume(dev->dev.parent); | |
1590 | if (!netif_device_present(dev)) | |
1591 | return -ENODEV; | |
1592 | } | |
1da177e4 | 1593 | |
ca99ca14 NH |
1594 | /* Block netpoll from trying to do any rx path servicing. |
1595 | * If we don't do this there is a chance ndo_poll_controller | |
1596 | * or ndo_poll may be running while we open the device | |
1597 | */ | |
66b5552f | 1598 | netpoll_poll_disable(dev); |
ca99ca14 | 1599 | |
40c900aa | 1600 | ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack); |
3b8bcfd5 JB |
1601 | ret = notifier_to_errno(ret); |
1602 | if (ret) | |
1603 | return ret; | |
1604 | ||
1da177e4 | 1605 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1606 | |
d314774c SH |
1607 | if (ops->ndo_validate_addr) |
1608 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1609 | |
d314774c SH |
1610 | if (!ret && ops->ndo_open) |
1611 | ret = ops->ndo_open(dev); | |
1da177e4 | 1612 | |
66b5552f | 1613 | netpoll_poll_enable(dev); |
ca99ca14 | 1614 | |
bada339b JG |
1615 | if (ret) |
1616 | clear_bit(__LINK_STATE_START, &dev->state); | |
1617 | else { | |
1da177e4 | 1618 | dev->flags |= IFF_UP; |
4417da66 | 1619 | dev_set_rx_mode(dev); |
1da177e4 | 1620 | dev_activate(dev); |
7bf23575 | 1621 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1622 | } |
bada339b | 1623 | |
1da177e4 LT |
1624 | return ret; |
1625 | } | |
1626 | ||
1627 | /** | |
bd380811 | 1628 | * dev_open - prepare an interface for use. |
00f54e68 PM |
1629 | * @dev: device to open |
1630 | * @extack: netlink extended ack | |
1da177e4 | 1631 | * |
bd380811 PM |
1632 | * Takes a device from down to up state. The device's private open |
1633 | * function is invoked and then the multicast lists are loaded. Finally | |
1634 | * the device is moved into the up state and a %NETDEV_UP message is | |
1635 | * sent to the netdev notifier chain. | |
1636 | * | |
1637 | * Calling this function on an active interface is a nop. On a failure | |
1638 | * a negative errno code is returned. | |
1da177e4 | 1639 | */ |
00f54e68 | 1640 | int dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
bd380811 PM |
1641 | { |
1642 | int ret; | |
1643 | ||
bd380811 PM |
1644 | if (dev->flags & IFF_UP) |
1645 | return 0; | |
1646 | ||
40c900aa | 1647 | ret = __dev_open(dev, extack); |
bd380811 PM |
1648 | if (ret < 0) |
1649 | return ret; | |
1650 | ||
7f294054 | 1651 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1652 | call_netdevice_notifiers(NETDEV_UP, dev); |
1653 | ||
1654 | return ret; | |
1655 | } | |
1656 | EXPORT_SYMBOL(dev_open); | |
1657 | ||
7051b88a | 1658 | static void __dev_close_many(struct list_head *head) |
1da177e4 | 1659 | { |
44345724 | 1660 | struct net_device *dev; |
e46b66bc | 1661 | |
bd380811 | 1662 | ASSERT_RTNL(); |
9d5010db DM |
1663 | might_sleep(); |
1664 | ||
5cde2829 | 1665 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1666 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1667 | netpoll_poll_disable(dev); |
3f4df206 | 1668 | |
44345724 | 1669 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1670 | |
44345724 | 1671 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1672 | |
44345724 OP |
1673 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1674 | * can be even on different cpu. So just clear netif_running(). | |
1675 | * | |
1676 | * dev->stop() will invoke napi_disable() on all of it's | |
1677 | * napi_struct instances on this device. | |
1678 | */ | |
4e857c58 | 1679 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1680 | } |
1da177e4 | 1681 | |
44345724 | 1682 | dev_deactivate_many(head); |
d8b2a4d2 | 1683 | |
5cde2829 | 1684 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1685 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1686 | |
44345724 OP |
1687 | /* |
1688 | * Call the device specific close. This cannot fail. | |
1689 | * Only if device is UP | |
1690 | * | |
1691 | * We allow it to be called even after a DETACH hot-plug | |
1692 | * event. | |
1693 | */ | |
1694 | if (ops->ndo_stop) | |
1695 | ops->ndo_stop(dev); | |
1696 | ||
44345724 | 1697 | dev->flags &= ~IFF_UP; |
66b5552f | 1698 | netpoll_poll_enable(dev); |
44345724 | 1699 | } |
44345724 OP |
1700 | } |
1701 | ||
7051b88a | 1702 | static void __dev_close(struct net_device *dev) |
44345724 OP |
1703 | { |
1704 | LIST_HEAD(single); | |
1705 | ||
5cde2829 | 1706 | list_add(&dev->close_list, &single); |
7051b88a | 1707 | __dev_close_many(&single); |
f87e6f47 | 1708 | list_del(&single); |
44345724 OP |
1709 | } |
1710 | ||
7051b88a | 1711 | void dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1712 | { |
1713 | struct net_device *dev, *tmp; | |
1da177e4 | 1714 | |
5cde2829 EB |
1715 | /* Remove the devices that don't need to be closed */ |
1716 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1717 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1718 | list_del_init(&dev->close_list); |
44345724 OP |
1719 | |
1720 | __dev_close_many(head); | |
1da177e4 | 1721 | |
5cde2829 | 1722 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1723 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1724 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1725 | if (unlink) |
1726 | list_del_init(&dev->close_list); | |
44345724 | 1727 | } |
bd380811 | 1728 | } |
99c4a26a | 1729 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1730 | |
1731 | /** | |
1732 | * dev_close - shutdown an interface. | |
1733 | * @dev: device to shutdown | |
1734 | * | |
1735 | * This function moves an active device into down state. A | |
1736 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1737 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1738 | * chain. | |
1739 | */ | |
7051b88a | 1740 | void dev_close(struct net_device *dev) |
bd380811 | 1741 | { |
e14a5993 ED |
1742 | if (dev->flags & IFF_UP) { |
1743 | LIST_HEAD(single); | |
1da177e4 | 1744 | |
5cde2829 | 1745 | list_add(&dev->close_list, &single); |
99c4a26a | 1746 | dev_close_many(&single, true); |
e14a5993 ED |
1747 | list_del(&single); |
1748 | } | |
1da177e4 | 1749 | } |
d1b19dff | 1750 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1751 | |
1752 | ||
0187bdfb BH |
1753 | /** |
1754 | * dev_disable_lro - disable Large Receive Offload on a device | |
1755 | * @dev: device | |
1756 | * | |
1757 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1758 | * called under RTNL. This is needed if received packets may be | |
1759 | * forwarded to another interface. | |
1760 | */ | |
1761 | void dev_disable_lro(struct net_device *dev) | |
1762 | { | |
fbe168ba MK |
1763 | struct net_device *lower_dev; |
1764 | struct list_head *iter; | |
529d0489 | 1765 | |
bc5787c6 MM |
1766 | dev->wanted_features &= ~NETIF_F_LRO; |
1767 | netdev_update_features(dev); | |
27660515 | 1768 | |
22d5969f MM |
1769 | if (unlikely(dev->features & NETIF_F_LRO)) |
1770 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1771 | |
1772 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1773 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1774 | } |
1775 | EXPORT_SYMBOL(dev_disable_lro); | |
1776 | ||
56f5aa77 MC |
1777 | /** |
1778 | * dev_disable_gro_hw - disable HW Generic Receive Offload on a device | |
1779 | * @dev: device | |
1780 | * | |
1781 | * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be | |
1782 | * called under RTNL. This is needed if Generic XDP is installed on | |
1783 | * the device. | |
1784 | */ | |
1785 | static void dev_disable_gro_hw(struct net_device *dev) | |
1786 | { | |
1787 | dev->wanted_features &= ~NETIF_F_GRO_HW; | |
1788 | netdev_update_features(dev); | |
1789 | ||
1790 | if (unlikely(dev->features & NETIF_F_GRO_HW)) | |
1791 | netdev_WARN(dev, "failed to disable GRO_HW!\n"); | |
1792 | } | |
1793 | ||
ede2762d KT |
1794 | const char *netdev_cmd_to_name(enum netdev_cmd cmd) |
1795 | { | |
1796 | #define N(val) \ | |
1797 | case NETDEV_##val: \ | |
1798 | return "NETDEV_" __stringify(val); | |
1799 | switch (cmd) { | |
1800 | N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) | |
1801 | N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) | |
1802 | N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) | |
1803 | N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) | |
1804 | N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) | |
1805 | N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) | |
1806 | N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) | |
9daae9bd GP |
1807 | N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) |
1808 | N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) | |
1570415f | 1809 | N(PRE_CHANGEADDR) |
3f5ecd8a | 1810 | } |
ede2762d KT |
1811 | #undef N |
1812 | return "UNKNOWN_NETDEV_EVENT"; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(netdev_cmd_to_name); | |
1815 | ||
351638e7 JP |
1816 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1817 | struct net_device *dev) | |
1818 | { | |
51d0c047 DA |
1819 | struct netdev_notifier_info info = { |
1820 | .dev = dev, | |
1821 | }; | |
351638e7 | 1822 | |
351638e7 JP |
1823 | return nb->notifier_call(nb, val, &info); |
1824 | } | |
0187bdfb | 1825 | |
afa0df59 JP |
1826 | static int call_netdevice_register_notifiers(struct notifier_block *nb, |
1827 | struct net_device *dev) | |
1828 | { | |
1829 | int err; | |
1830 | ||
1831 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); | |
1832 | err = notifier_to_errno(err); | |
1833 | if (err) | |
1834 | return err; | |
1835 | ||
1836 | if (!(dev->flags & IFF_UP)) | |
1837 | return 0; | |
1838 | ||
1839 | call_netdevice_notifier(nb, NETDEV_UP, dev); | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | static void call_netdevice_unregister_notifiers(struct notifier_block *nb, | |
1844 | struct net_device *dev) | |
1845 | { | |
1846 | if (dev->flags & IFF_UP) { | |
1847 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, | |
1848 | dev); | |
1849 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
1850 | } | |
1851 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); | |
1852 | } | |
1853 | ||
1854 | static int call_netdevice_register_net_notifiers(struct notifier_block *nb, | |
1855 | struct net *net) | |
1856 | { | |
1857 | struct net_device *dev; | |
1858 | int err; | |
1859 | ||
1860 | for_each_netdev(net, dev) { | |
1861 | err = call_netdevice_register_notifiers(nb, dev); | |
1862 | if (err) | |
1863 | goto rollback; | |
1864 | } | |
1865 | return 0; | |
1866 | ||
1867 | rollback: | |
1868 | for_each_netdev_continue_reverse(net, dev) | |
1869 | call_netdevice_unregister_notifiers(nb, dev); | |
1870 | return err; | |
1871 | } | |
1872 | ||
1873 | static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb, | |
1874 | struct net *net) | |
1875 | { | |
1876 | struct net_device *dev; | |
1877 | ||
1878 | for_each_netdev(net, dev) | |
1879 | call_netdevice_unregister_notifiers(nb, dev); | |
1880 | } | |
1881 | ||
881d966b EB |
1882 | static int dev_boot_phase = 1; |
1883 | ||
1da177e4 | 1884 | /** |
722c9a0c | 1885 | * register_netdevice_notifier - register a network notifier block |
1886 | * @nb: notifier | |
1da177e4 | 1887 | * |
722c9a0c | 1888 | * Register a notifier to be called when network device events occur. |
1889 | * The notifier passed is linked into the kernel structures and must | |
1890 | * not be reused until it has been unregistered. A negative errno code | |
1891 | * is returned on a failure. | |
1da177e4 | 1892 | * |
722c9a0c | 1893 | * When registered all registration and up events are replayed |
1894 | * to the new notifier to allow device to have a race free | |
1895 | * view of the network device list. | |
1da177e4 LT |
1896 | */ |
1897 | ||
1898 | int register_netdevice_notifier(struct notifier_block *nb) | |
1899 | { | |
881d966b | 1900 | struct net *net; |
1da177e4 LT |
1901 | int err; |
1902 | ||
328fbe74 KT |
1903 | /* Close race with setup_net() and cleanup_net() */ |
1904 | down_write(&pernet_ops_rwsem); | |
1da177e4 | 1905 | rtnl_lock(); |
f07d5b94 | 1906 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1907 | if (err) |
1908 | goto unlock; | |
881d966b EB |
1909 | if (dev_boot_phase) |
1910 | goto unlock; | |
1911 | for_each_net(net) { | |
afa0df59 JP |
1912 | err = call_netdevice_register_net_notifiers(nb, net); |
1913 | if (err) | |
1914 | goto rollback; | |
1da177e4 | 1915 | } |
fcc5a03a HX |
1916 | |
1917 | unlock: | |
1da177e4 | 1918 | rtnl_unlock(); |
328fbe74 | 1919 | up_write(&pernet_ops_rwsem); |
1da177e4 | 1920 | return err; |
fcc5a03a HX |
1921 | |
1922 | rollback: | |
afa0df59 JP |
1923 | for_each_net_continue_reverse(net) |
1924 | call_netdevice_unregister_net_notifiers(nb, net); | |
c67625a1 PE |
1925 | |
1926 | raw_notifier_chain_unregister(&netdev_chain, nb); | |
fcc5a03a | 1927 | goto unlock; |
1da177e4 | 1928 | } |
d1b19dff | 1929 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1930 | |
1931 | /** | |
722c9a0c | 1932 | * unregister_netdevice_notifier - unregister a network notifier block |
1933 | * @nb: notifier | |
1da177e4 | 1934 | * |
722c9a0c | 1935 | * Unregister a notifier previously registered by |
1936 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1937 | * kernel structures and may then be reused. A negative errno code | |
1938 | * is returned on a failure. | |
7d3d43da | 1939 | * |
722c9a0c | 1940 | * After unregistering unregister and down device events are synthesized |
1941 | * for all devices on the device list to the removed notifier to remove | |
1942 | * the need for special case cleanup code. | |
1da177e4 LT |
1943 | */ |
1944 | ||
1945 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1946 | { | |
7d3d43da | 1947 | struct net *net; |
9f514950 HX |
1948 | int err; |
1949 | ||
328fbe74 KT |
1950 | /* Close race with setup_net() and cleanup_net() */ |
1951 | down_write(&pernet_ops_rwsem); | |
9f514950 | 1952 | rtnl_lock(); |
f07d5b94 | 1953 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1954 | if (err) |
1955 | goto unlock; | |
1956 | ||
48b3a137 JP |
1957 | for_each_net(net) |
1958 | call_netdevice_unregister_net_notifiers(nb, net); | |
1959 | ||
7d3d43da | 1960 | unlock: |
9f514950 | 1961 | rtnl_unlock(); |
328fbe74 | 1962 | up_write(&pernet_ops_rwsem); |
9f514950 | 1963 | return err; |
1da177e4 | 1964 | } |
d1b19dff | 1965 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1966 | |
1f637703 JP |
1967 | static int __register_netdevice_notifier_net(struct net *net, |
1968 | struct notifier_block *nb, | |
1969 | bool ignore_call_fail) | |
1970 | { | |
1971 | int err; | |
1972 | ||
1973 | err = raw_notifier_chain_register(&net->netdev_chain, nb); | |
1974 | if (err) | |
1975 | return err; | |
1976 | if (dev_boot_phase) | |
1977 | return 0; | |
1978 | ||
1979 | err = call_netdevice_register_net_notifiers(nb, net); | |
1980 | if (err && !ignore_call_fail) | |
1981 | goto chain_unregister; | |
1982 | ||
1983 | return 0; | |
1984 | ||
1985 | chain_unregister: | |
1986 | raw_notifier_chain_unregister(&net->netdev_chain, nb); | |
1987 | return err; | |
1988 | } | |
1989 | ||
1990 | static int __unregister_netdevice_notifier_net(struct net *net, | |
1991 | struct notifier_block *nb) | |
1992 | { | |
1993 | int err; | |
1994 | ||
1995 | err = raw_notifier_chain_unregister(&net->netdev_chain, nb); | |
1996 | if (err) | |
1997 | return err; | |
1998 | ||
1999 | call_netdevice_unregister_net_notifiers(nb, net); | |
2000 | return 0; | |
2001 | } | |
2002 | ||
a30c7b42 JP |
2003 | /** |
2004 | * register_netdevice_notifier_net - register a per-netns network notifier block | |
2005 | * @net: network namespace | |
2006 | * @nb: notifier | |
2007 | * | |
2008 | * Register a notifier to be called when network device events occur. | |
2009 | * The notifier passed is linked into the kernel structures and must | |
2010 | * not be reused until it has been unregistered. A negative errno code | |
2011 | * is returned on a failure. | |
2012 | * | |
2013 | * When registered all registration and up events are replayed | |
2014 | * to the new notifier to allow device to have a race free | |
2015 | * view of the network device list. | |
2016 | */ | |
2017 | ||
2018 | int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb) | |
2019 | { | |
2020 | int err; | |
2021 | ||
2022 | rtnl_lock(); | |
1f637703 | 2023 | err = __register_netdevice_notifier_net(net, nb, false); |
a30c7b42 JP |
2024 | rtnl_unlock(); |
2025 | return err; | |
a30c7b42 JP |
2026 | } |
2027 | EXPORT_SYMBOL(register_netdevice_notifier_net); | |
2028 | ||
2029 | /** | |
2030 | * unregister_netdevice_notifier_net - unregister a per-netns | |
2031 | * network notifier block | |
2032 | * @net: network namespace | |
2033 | * @nb: notifier | |
2034 | * | |
2035 | * Unregister a notifier previously registered by | |
2036 | * register_netdevice_notifier(). The notifier is unlinked into the | |
2037 | * kernel structures and may then be reused. A negative errno code | |
2038 | * is returned on a failure. | |
2039 | * | |
2040 | * After unregistering unregister and down device events are synthesized | |
2041 | * for all devices on the device list to the removed notifier to remove | |
2042 | * the need for special case cleanup code. | |
2043 | */ | |
2044 | ||
2045 | int unregister_netdevice_notifier_net(struct net *net, | |
2046 | struct notifier_block *nb) | |
2047 | { | |
2048 | int err; | |
2049 | ||
2050 | rtnl_lock(); | |
1f637703 | 2051 | err = __unregister_netdevice_notifier_net(net, nb); |
a30c7b42 JP |
2052 | rtnl_unlock(); |
2053 | return err; | |
2054 | } | |
2055 | EXPORT_SYMBOL(unregister_netdevice_notifier_net); | |
a30c7b42 | 2056 | |
93642e14 JP |
2057 | int register_netdevice_notifier_dev_net(struct net_device *dev, |
2058 | struct notifier_block *nb, | |
2059 | struct netdev_net_notifier *nn) | |
2060 | { | |
2061 | int err; | |
a30c7b42 | 2062 | |
93642e14 JP |
2063 | rtnl_lock(); |
2064 | err = __register_netdevice_notifier_net(dev_net(dev), nb, false); | |
2065 | if (!err) { | |
2066 | nn->nb = nb; | |
2067 | list_add(&nn->list, &dev->net_notifier_list); | |
2068 | } | |
a30c7b42 JP |
2069 | rtnl_unlock(); |
2070 | return err; | |
2071 | } | |
93642e14 JP |
2072 | EXPORT_SYMBOL(register_netdevice_notifier_dev_net); |
2073 | ||
2074 | int unregister_netdevice_notifier_dev_net(struct net_device *dev, | |
2075 | struct notifier_block *nb, | |
2076 | struct netdev_net_notifier *nn) | |
2077 | { | |
2078 | int err; | |
2079 | ||
2080 | rtnl_lock(); | |
2081 | list_del(&nn->list); | |
2082 | err = __unregister_netdevice_notifier_net(dev_net(dev), nb); | |
2083 | rtnl_unlock(); | |
2084 | return err; | |
2085 | } | |
2086 | EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net); | |
2087 | ||
2088 | static void move_netdevice_notifiers_dev_net(struct net_device *dev, | |
2089 | struct net *net) | |
2090 | { | |
2091 | struct netdev_net_notifier *nn; | |
2092 | ||
2093 | list_for_each_entry(nn, &dev->net_notifier_list, list) { | |
2094 | __unregister_netdevice_notifier_net(dev_net(dev), nn->nb); | |
2095 | __register_netdevice_notifier_net(net, nn->nb, true); | |
2096 | } | |
2097 | } | |
a30c7b42 | 2098 | |
351638e7 JP |
2099 | /** |
2100 | * call_netdevice_notifiers_info - call all network notifier blocks | |
2101 | * @val: value passed unmodified to notifier function | |
351638e7 JP |
2102 | * @info: notifier information data |
2103 | * | |
2104 | * Call all network notifier blocks. Parameters and return value | |
2105 | * are as for raw_notifier_call_chain(). | |
2106 | */ | |
2107 | ||
1d143d9f | 2108 | static int call_netdevice_notifiers_info(unsigned long val, |
1d143d9f | 2109 | struct netdev_notifier_info *info) |
351638e7 | 2110 | { |
a30c7b42 JP |
2111 | struct net *net = dev_net(info->dev); |
2112 | int ret; | |
2113 | ||
351638e7 | 2114 | ASSERT_RTNL(); |
a30c7b42 JP |
2115 | |
2116 | /* Run per-netns notifier block chain first, then run the global one. | |
2117 | * Hopefully, one day, the global one is going to be removed after | |
2118 | * all notifier block registrators get converted to be per-netns. | |
2119 | */ | |
2120 | ret = raw_notifier_call_chain(&net->netdev_chain, val, info); | |
2121 | if (ret & NOTIFY_STOP_MASK) | |
2122 | return ret; | |
351638e7 JP |
2123 | return raw_notifier_call_chain(&netdev_chain, val, info); |
2124 | } | |
351638e7 | 2125 | |
26372605 PM |
2126 | static int call_netdevice_notifiers_extack(unsigned long val, |
2127 | struct net_device *dev, | |
2128 | struct netlink_ext_ack *extack) | |
2129 | { | |
2130 | struct netdev_notifier_info info = { | |
2131 | .dev = dev, | |
2132 | .extack = extack, | |
2133 | }; | |
2134 | ||
2135 | return call_netdevice_notifiers_info(val, &info); | |
2136 | } | |
2137 | ||
1da177e4 LT |
2138 | /** |
2139 | * call_netdevice_notifiers - call all network notifier blocks | |
2140 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 2141 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
2142 | * |
2143 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 2144 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
2145 | */ |
2146 | ||
ad7379d4 | 2147 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 2148 | { |
26372605 | 2149 | return call_netdevice_notifiers_extack(val, dev, NULL); |
1da177e4 | 2150 | } |
edf947f1 | 2151 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 2152 | |
af7d6cce SD |
2153 | /** |
2154 | * call_netdevice_notifiers_mtu - call all network notifier blocks | |
2155 | * @val: value passed unmodified to notifier function | |
2156 | * @dev: net_device pointer passed unmodified to notifier function | |
2157 | * @arg: additional u32 argument passed to the notifier function | |
2158 | * | |
2159 | * Call all network notifier blocks. Parameters and return value | |
2160 | * are as for raw_notifier_call_chain(). | |
2161 | */ | |
2162 | static int call_netdevice_notifiers_mtu(unsigned long val, | |
2163 | struct net_device *dev, u32 arg) | |
2164 | { | |
2165 | struct netdev_notifier_info_ext info = { | |
2166 | .info.dev = dev, | |
2167 | .ext.mtu = arg, | |
2168 | }; | |
2169 | ||
2170 | BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0); | |
2171 | ||
2172 | return call_netdevice_notifiers_info(val, &info.info); | |
2173 | } | |
2174 | ||
1cf51900 | 2175 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 2176 | static DEFINE_STATIC_KEY_FALSE(ingress_needed_key); |
4577139b DB |
2177 | |
2178 | void net_inc_ingress_queue(void) | |
2179 | { | |
aabf6772 | 2180 | static_branch_inc(&ingress_needed_key); |
4577139b DB |
2181 | } |
2182 | EXPORT_SYMBOL_GPL(net_inc_ingress_queue); | |
2183 | ||
2184 | void net_dec_ingress_queue(void) | |
2185 | { | |
aabf6772 | 2186 | static_branch_dec(&ingress_needed_key); |
4577139b DB |
2187 | } |
2188 | EXPORT_SYMBOL_GPL(net_dec_ingress_queue); | |
2189 | #endif | |
2190 | ||
1f211a1b | 2191 | #ifdef CONFIG_NET_EGRESS |
aabf6772 | 2192 | static DEFINE_STATIC_KEY_FALSE(egress_needed_key); |
1f211a1b DB |
2193 | |
2194 | void net_inc_egress_queue(void) | |
2195 | { | |
aabf6772 | 2196 | static_branch_inc(&egress_needed_key); |
1f211a1b DB |
2197 | } |
2198 | EXPORT_SYMBOL_GPL(net_inc_egress_queue); | |
2199 | ||
2200 | void net_dec_egress_queue(void) | |
2201 | { | |
aabf6772 | 2202 | static_branch_dec(&egress_needed_key); |
1f211a1b DB |
2203 | } |
2204 | EXPORT_SYMBOL_GPL(net_dec_egress_queue); | |
2205 | #endif | |
2206 | ||
39e83922 | 2207 | static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key); |
e9666d10 | 2208 | #ifdef CONFIG_JUMP_LABEL |
b90e5794 | 2209 | static atomic_t netstamp_needed_deferred; |
13baa00a | 2210 | static atomic_t netstamp_wanted; |
5fa8bbda | 2211 | static void netstamp_clear(struct work_struct *work) |
1da177e4 | 2212 | { |
b90e5794 | 2213 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
13baa00a | 2214 | int wanted; |
b90e5794 | 2215 | |
13baa00a ED |
2216 | wanted = atomic_add_return(deferred, &netstamp_wanted); |
2217 | if (wanted > 0) | |
39e83922 | 2218 | static_branch_enable(&netstamp_needed_key); |
13baa00a | 2219 | else |
39e83922 | 2220 | static_branch_disable(&netstamp_needed_key); |
5fa8bbda ED |
2221 | } |
2222 | static DECLARE_WORK(netstamp_work, netstamp_clear); | |
b90e5794 | 2223 | #endif |
5fa8bbda ED |
2224 | |
2225 | void net_enable_timestamp(void) | |
2226 | { | |
e9666d10 | 2227 | #ifdef CONFIG_JUMP_LABEL |
13baa00a ED |
2228 | int wanted; |
2229 | ||
2230 | while (1) { | |
2231 | wanted = atomic_read(&netstamp_wanted); | |
2232 | if (wanted <= 0) | |
2233 | break; | |
2234 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted) | |
2235 | return; | |
2236 | } | |
2237 | atomic_inc(&netstamp_needed_deferred); | |
2238 | schedule_work(&netstamp_work); | |
2239 | #else | |
39e83922 | 2240 | static_branch_inc(&netstamp_needed_key); |
13baa00a | 2241 | #endif |
1da177e4 | 2242 | } |
d1b19dff | 2243 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
2244 | |
2245 | void net_disable_timestamp(void) | |
2246 | { | |
e9666d10 | 2247 | #ifdef CONFIG_JUMP_LABEL |
13baa00a ED |
2248 | int wanted; |
2249 | ||
2250 | while (1) { | |
2251 | wanted = atomic_read(&netstamp_wanted); | |
2252 | if (wanted <= 1) | |
2253 | break; | |
2254 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted) | |
2255 | return; | |
2256 | } | |
2257 | atomic_dec(&netstamp_needed_deferred); | |
5fa8bbda ED |
2258 | schedule_work(&netstamp_work); |
2259 | #else | |
39e83922 | 2260 | static_branch_dec(&netstamp_needed_key); |
5fa8bbda | 2261 | #endif |
1da177e4 | 2262 | } |
d1b19dff | 2263 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 2264 | |
3b098e2d | 2265 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 2266 | { |
2456e855 | 2267 | skb->tstamp = 0; |
39e83922 | 2268 | if (static_branch_unlikely(&netstamp_needed_key)) |
a61bbcf2 | 2269 | __net_timestamp(skb); |
1da177e4 LT |
2270 | } |
2271 | ||
39e83922 DB |
2272 | #define net_timestamp_check(COND, SKB) \ |
2273 | if (static_branch_unlikely(&netstamp_needed_key)) { \ | |
2274 | if ((COND) && !(SKB)->tstamp) \ | |
2275 | __net_timestamp(SKB); \ | |
2276 | } \ | |
3b098e2d | 2277 | |
f4b05d27 | 2278 | bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
79b569f0 | 2279 | { |
5f7d5728 | 2280 | return __is_skb_forwardable(dev, skb, true); |
79b569f0 | 2281 | } |
1ee481fb | 2282 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 2283 | |
5f7d5728 JDB |
2284 | static int __dev_forward_skb2(struct net_device *dev, struct sk_buff *skb, |
2285 | bool check_mtu) | |
a0265d28 | 2286 | { |
5f7d5728 | 2287 | int ret = ____dev_forward_skb(dev, skb, check_mtu); |
a0265d28 | 2288 | |
4e3264d2 MKL |
2289 | if (likely(!ret)) { |
2290 | skb->protocol = eth_type_trans(skb, dev); | |
2291 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
2292 | } | |
a0265d28 | 2293 | |
4e3264d2 | 2294 | return ret; |
a0265d28 | 2295 | } |
5f7d5728 JDB |
2296 | |
2297 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
2298 | { | |
2299 | return __dev_forward_skb2(dev, skb, true); | |
2300 | } | |
a0265d28 HX |
2301 | EXPORT_SYMBOL_GPL(__dev_forward_skb); |
2302 | ||
44540960 AB |
2303 | /** |
2304 | * dev_forward_skb - loopback an skb to another netif | |
2305 | * | |
2306 | * @dev: destination network device | |
2307 | * @skb: buffer to forward | |
2308 | * | |
2309 | * return values: | |
2310 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 2311 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
2312 | * |
2313 | * dev_forward_skb can be used for injecting an skb from the | |
2314 | * start_xmit function of one device into the receive queue | |
2315 | * of another device. | |
2316 | * | |
2317 | * The receiving device may be in another namespace, so | |
2318 | * we have to clear all information in the skb that could | |
2319 | * impact namespace isolation. | |
2320 | */ | |
2321 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
2322 | { | |
a0265d28 | 2323 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
2324 | } |
2325 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
2326 | ||
5f7d5728 JDB |
2327 | int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb) |
2328 | { | |
2329 | return __dev_forward_skb2(dev, skb, false) ?: netif_rx_internal(skb); | |
2330 | } | |
2331 | ||
71d9dec2 CG |
2332 | static inline int deliver_skb(struct sk_buff *skb, |
2333 | struct packet_type *pt_prev, | |
2334 | struct net_device *orig_dev) | |
2335 | { | |
1f8b977a | 2336 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
1080e512 | 2337 | return -ENOMEM; |
63354797 | 2338 | refcount_inc(&skb->users); |
71d9dec2 CG |
2339 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
2340 | } | |
2341 | ||
7866a621 SN |
2342 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
2343 | struct packet_type **pt, | |
fbcb2170 JP |
2344 | struct net_device *orig_dev, |
2345 | __be16 type, | |
7866a621 SN |
2346 | struct list_head *ptype_list) |
2347 | { | |
2348 | struct packet_type *ptype, *pt_prev = *pt; | |
2349 | ||
2350 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
2351 | if (ptype->type != type) | |
2352 | continue; | |
2353 | if (pt_prev) | |
fbcb2170 | 2354 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
2355 | pt_prev = ptype; |
2356 | } | |
2357 | *pt = pt_prev; | |
2358 | } | |
2359 | ||
c0de08d0 EL |
2360 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
2361 | { | |
a3d744e9 | 2362 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
2363 | return false; |
2364 | ||
2365 | if (ptype->id_match) | |
2366 | return ptype->id_match(ptype, skb->sk); | |
2367 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
2368 | return true; | |
2369 | ||
2370 | return false; | |
2371 | } | |
2372 | ||
9f9a742d MR |
2373 | /** |
2374 | * dev_nit_active - return true if any network interface taps are in use | |
2375 | * | |
2376 | * @dev: network device to check for the presence of taps | |
2377 | */ | |
2378 | bool dev_nit_active(struct net_device *dev) | |
2379 | { | |
2380 | return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all); | |
2381 | } | |
2382 | EXPORT_SYMBOL_GPL(dev_nit_active); | |
2383 | ||
1da177e4 LT |
2384 | /* |
2385 | * Support routine. Sends outgoing frames to any network | |
2386 | * taps currently in use. | |
2387 | */ | |
2388 | ||
74b20582 | 2389 | void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
2390 | { |
2391 | struct packet_type *ptype; | |
71d9dec2 CG |
2392 | struct sk_buff *skb2 = NULL; |
2393 | struct packet_type *pt_prev = NULL; | |
7866a621 | 2394 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 2395 | |
1da177e4 | 2396 | rcu_read_lock(); |
7866a621 SN |
2397 | again: |
2398 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
fa788d98 VW |
2399 | if (ptype->ignore_outgoing) |
2400 | continue; | |
2401 | ||
1da177e4 LT |
2402 | /* Never send packets back to the socket |
2403 | * they originated from - MvS (miquels@drinkel.ow.org) | |
2404 | */ | |
7866a621 SN |
2405 | if (skb_loop_sk(ptype, skb)) |
2406 | continue; | |
71d9dec2 | 2407 | |
7866a621 SN |
2408 | if (pt_prev) { |
2409 | deliver_skb(skb2, pt_prev, skb->dev); | |
2410 | pt_prev = ptype; | |
2411 | continue; | |
2412 | } | |
1da177e4 | 2413 | |
7866a621 SN |
2414 | /* need to clone skb, done only once */ |
2415 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2416 | if (!skb2) | |
2417 | goto out_unlock; | |
70978182 | 2418 | |
7866a621 | 2419 | net_timestamp_set(skb2); |
1da177e4 | 2420 | |
7866a621 SN |
2421 | /* skb->nh should be correctly |
2422 | * set by sender, so that the second statement is | |
2423 | * just protection against buggy protocols. | |
2424 | */ | |
2425 | skb_reset_mac_header(skb2); | |
2426 | ||
2427 | if (skb_network_header(skb2) < skb2->data || | |
2428 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
2429 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
2430 | ntohs(skb2->protocol), | |
2431 | dev->name); | |
2432 | skb_reset_network_header(skb2); | |
1da177e4 | 2433 | } |
7866a621 SN |
2434 | |
2435 | skb2->transport_header = skb2->network_header; | |
2436 | skb2->pkt_type = PACKET_OUTGOING; | |
2437 | pt_prev = ptype; | |
2438 | } | |
2439 | ||
2440 | if (ptype_list == &ptype_all) { | |
2441 | ptype_list = &dev->ptype_all; | |
2442 | goto again; | |
1da177e4 | 2443 | } |
7866a621 | 2444 | out_unlock: |
581fe0ea WB |
2445 | if (pt_prev) { |
2446 | if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) | |
2447 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
2448 | else | |
2449 | kfree_skb(skb2); | |
2450 | } | |
1da177e4 LT |
2451 | rcu_read_unlock(); |
2452 | } | |
74b20582 | 2453 | EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
1da177e4 | 2454 | |
2c53040f BH |
2455 | /** |
2456 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
2457 | * @dev: Network device |
2458 | * @txq: number of queues available | |
2459 | * | |
2460 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
2461 | * valid. To resolve this verify the tc mapping remains valid and if | |
2462 | * not NULL the mapping. With no priorities mapping to this | |
2463 | * offset/count pair it will no longer be used. In the worst case TC0 | |
2464 | * is invalid nothing can be done so disable priority mappings. If is | |
2465 | * expected that drivers will fix this mapping if they can before | |
2466 | * calling netif_set_real_num_tx_queues. | |
2467 | */ | |
bb134d22 | 2468 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
2469 | { |
2470 | int i; | |
2471 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2472 | ||
2473 | /* If TC0 is invalidated disable TC mapping */ | |
2474 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 2475 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
2476 | dev->num_tc = 0; |
2477 | return; | |
2478 | } | |
2479 | ||
2480 | /* Invalidated prio to tc mappings set to TC0 */ | |
2481 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
2482 | int q = netdev_get_prio_tc_map(dev, i); | |
2483 | ||
2484 | tc = &dev->tc_to_txq[q]; | |
2485 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
2486 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
2487 | i, q); | |
4f57c087 JF |
2488 | netdev_set_prio_tc_map(dev, i, 0); |
2489 | } | |
2490 | } | |
2491 | } | |
2492 | ||
8d059b0f AD |
2493 | int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
2494 | { | |
2495 | if (dev->num_tc) { | |
2496 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2497 | int i; | |
2498 | ||
ffcfe25b | 2499 | /* walk through the TCs and see if it falls into any of them */ |
8d059b0f AD |
2500 | for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { |
2501 | if ((txq - tc->offset) < tc->count) | |
2502 | return i; | |
2503 | } | |
2504 | ||
ffcfe25b | 2505 | /* didn't find it, just return -1 to indicate no match */ |
8d059b0f AD |
2506 | return -1; |
2507 | } | |
2508 | ||
2509 | return 0; | |
2510 | } | |
8a5f2166 | 2511 | EXPORT_SYMBOL(netdev_txq_to_tc); |
8d059b0f | 2512 | |
537c00de | 2513 | #ifdef CONFIG_XPS |
5da9ace3 VO |
2514 | static struct static_key xps_needed __read_mostly; |
2515 | static struct static_key xps_rxqs_needed __read_mostly; | |
537c00de AD |
2516 | static DEFINE_MUTEX(xps_map_mutex); |
2517 | #define xmap_dereference(P) \ | |
2518 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
2519 | ||
6234f874 | 2520 | static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
2d05bf01 | 2521 | struct xps_dev_maps *old_maps, int tci, u16 index) |
537c00de | 2522 | { |
10cdc3f3 AD |
2523 | struct xps_map *map = NULL; |
2524 | int pos; | |
537c00de | 2525 | |
10cdc3f3 | 2526 | if (dev_maps) |
80d19669 | 2527 | map = xmap_dereference(dev_maps->attr_map[tci]); |
6234f874 AD |
2528 | if (!map) |
2529 | return false; | |
537c00de | 2530 | |
6234f874 AD |
2531 | for (pos = map->len; pos--;) { |
2532 | if (map->queues[pos] != index) | |
2533 | continue; | |
2534 | ||
2535 | if (map->len > 1) { | |
2536 | map->queues[pos] = map->queues[--map->len]; | |
10cdc3f3 | 2537 | break; |
537c00de | 2538 | } |
6234f874 | 2539 | |
2d05bf01 AT |
2540 | if (old_maps) |
2541 | RCU_INIT_POINTER(old_maps->attr_map[tci], NULL); | |
80d19669 | 2542 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
6234f874 AD |
2543 | kfree_rcu(map, rcu); |
2544 | return false; | |
537c00de AD |
2545 | } |
2546 | ||
6234f874 | 2547 | return true; |
10cdc3f3 AD |
2548 | } |
2549 | ||
6234f874 AD |
2550 | static bool remove_xps_queue_cpu(struct net_device *dev, |
2551 | struct xps_dev_maps *dev_maps, | |
2552 | int cpu, u16 offset, u16 count) | |
2553 | { | |
255c04a8 | 2554 | int num_tc = dev_maps->num_tc; |
184c449f AD |
2555 | bool active = false; |
2556 | int tci; | |
6234f874 | 2557 | |
184c449f AD |
2558 | for (tci = cpu * num_tc; num_tc--; tci++) { |
2559 | int i, j; | |
2560 | ||
2561 | for (i = count, j = offset; i--; j++) { | |
2d05bf01 | 2562 | if (!remove_xps_queue(dev_maps, NULL, tci, j)) |
184c449f AD |
2563 | break; |
2564 | } | |
2565 | ||
2566 | active |= i < 0; | |
6234f874 AD |
2567 | } |
2568 | ||
184c449f | 2569 | return active; |
6234f874 AD |
2570 | } |
2571 | ||
867d0ad4 SD |
2572 | static void reset_xps_maps(struct net_device *dev, |
2573 | struct xps_dev_maps *dev_maps, | |
044ab86d | 2574 | enum xps_map_type type) |
867d0ad4 | 2575 | { |
867d0ad4 | 2576 | static_key_slow_dec_cpuslocked(&xps_needed); |
044ab86d AT |
2577 | if (type == XPS_RXQS) |
2578 | static_key_slow_dec_cpuslocked(&xps_rxqs_needed); | |
2579 | ||
2580 | RCU_INIT_POINTER(dev->xps_maps[type], NULL); | |
2581 | ||
867d0ad4 SD |
2582 | kfree_rcu(dev_maps, rcu); |
2583 | } | |
2584 | ||
044ab86d AT |
2585 | static void clean_xps_maps(struct net_device *dev, enum xps_map_type type, |
2586 | u16 offset, u16 count) | |
80d19669 | 2587 | { |
044ab86d | 2588 | struct xps_dev_maps *dev_maps; |
80d19669 AN |
2589 | bool active = false; |
2590 | int i, j; | |
2591 | ||
044ab86d AT |
2592 | dev_maps = xmap_dereference(dev->xps_maps[type]); |
2593 | if (!dev_maps) | |
2594 | return; | |
2595 | ||
6f36158e AT |
2596 | for (j = 0; j < dev_maps->nr_ids; j++) |
2597 | active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, count); | |
867d0ad4 | 2598 | if (!active) |
044ab86d | 2599 | reset_xps_maps(dev, dev_maps, type); |
80d19669 | 2600 | |
044ab86d | 2601 | if (type == XPS_CPUS) { |
6f36158e | 2602 | for (i = offset + (count - 1); count--; i--) |
f28c020f | 2603 | netdev_queue_numa_node_write( |
6f36158e | 2604 | netdev_get_tx_queue(dev, i), NUMA_NO_NODE); |
80d19669 AN |
2605 | } |
2606 | } | |
2607 | ||
6234f874 AD |
2608 | static void netif_reset_xps_queues(struct net_device *dev, u16 offset, |
2609 | u16 count) | |
10cdc3f3 | 2610 | { |
04157469 AN |
2611 | if (!static_key_false(&xps_needed)) |
2612 | return; | |
10cdc3f3 | 2613 | |
4d99f660 | 2614 | cpus_read_lock(); |
04157469 | 2615 | mutex_lock(&xps_map_mutex); |
10cdc3f3 | 2616 | |
044ab86d AT |
2617 | if (static_key_false(&xps_rxqs_needed)) |
2618 | clean_xps_maps(dev, XPS_RXQS, offset, count); | |
80d19669 | 2619 | |
044ab86d | 2620 | clean_xps_maps(dev, XPS_CPUS, offset, count); |
024e9679 | 2621 | |
537c00de | 2622 | mutex_unlock(&xps_map_mutex); |
4d99f660 | 2623 | cpus_read_unlock(); |
537c00de AD |
2624 | } |
2625 | ||
6234f874 AD |
2626 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
2627 | { | |
2628 | netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); | |
2629 | } | |
2630 | ||
80d19669 AN |
2631 | static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, |
2632 | u16 index, bool is_rxqs_map) | |
01c5f864 AD |
2633 | { |
2634 | struct xps_map *new_map; | |
2635 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
2636 | int i, pos; | |
2637 | ||
2638 | for (pos = 0; map && pos < map->len; pos++) { | |
2639 | if (map->queues[pos] != index) | |
2640 | continue; | |
2641 | return map; | |
2642 | } | |
2643 | ||
80d19669 | 2644 | /* Need to add tx-queue to this CPU's/rx-queue's existing map */ |
01c5f864 AD |
2645 | if (map) { |
2646 | if (pos < map->alloc_len) | |
2647 | return map; | |
2648 | ||
2649 | alloc_len = map->alloc_len * 2; | |
2650 | } | |
2651 | ||
80d19669 AN |
2652 | /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's |
2653 | * map | |
2654 | */ | |
2655 | if (is_rxqs_map) | |
2656 | new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); | |
2657 | else | |
2658 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
2659 | cpu_to_node(attr_index)); | |
01c5f864 AD |
2660 | if (!new_map) |
2661 | return NULL; | |
2662 | ||
2663 | for (i = 0; i < pos; i++) | |
2664 | new_map->queues[i] = map->queues[i]; | |
2665 | new_map->alloc_len = alloc_len; | |
2666 | new_map->len = pos; | |
2667 | ||
2668 | return new_map; | |
2669 | } | |
2670 | ||
402fbb99 AT |
2671 | /* Copy xps maps at a given index */ |
2672 | static void xps_copy_dev_maps(struct xps_dev_maps *dev_maps, | |
2673 | struct xps_dev_maps *new_dev_maps, int index, | |
2674 | int tc, bool skip_tc) | |
2675 | { | |
2676 | int i, tci = index * dev_maps->num_tc; | |
2677 | struct xps_map *map; | |
2678 | ||
2679 | /* copy maps belonging to foreign traffic classes */ | |
2680 | for (i = 0; i < dev_maps->num_tc; i++, tci++) { | |
2681 | if (i == tc && skip_tc) | |
2682 | continue; | |
2683 | ||
2684 | /* fill in the new device map from the old device map */ | |
2685 | map = xmap_dereference(dev_maps->attr_map[tci]); | |
2686 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
2687 | } | |
2688 | } | |
2689 | ||
4d99f660 | 2690 | /* Must be called under cpus_read_lock */ |
80d19669 | 2691 | int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, |
044ab86d | 2692 | u16 index, enum xps_map_type type) |
537c00de | 2693 | { |
2d05bf01 | 2694 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL, *old_dev_maps = NULL; |
6f36158e | 2695 | const unsigned long *online_mask = NULL; |
255c04a8 | 2696 | bool active = false, copy = false; |
80d19669 | 2697 | int i, j, tci, numa_node_id = -2; |
184c449f | 2698 | int maps_sz, num_tc = 1, tc = 0; |
537c00de | 2699 | struct xps_map *map, *new_map; |
80d19669 | 2700 | unsigned int nr_ids; |
537c00de | 2701 | |
184c449f | 2702 | if (dev->num_tc) { |
ffcfe25b | 2703 | /* Do not allow XPS on subordinate device directly */ |
184c449f | 2704 | num_tc = dev->num_tc; |
ffcfe25b AD |
2705 | if (num_tc < 0) |
2706 | return -EINVAL; | |
2707 | ||
2708 | /* If queue belongs to subordinate dev use its map */ | |
2709 | dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; | |
2710 | ||
184c449f AD |
2711 | tc = netdev_txq_to_tc(dev, index); |
2712 | if (tc < 0) | |
2713 | return -EINVAL; | |
2714 | } | |
2715 | ||
537c00de | 2716 | mutex_lock(&xps_map_mutex); |
044ab86d AT |
2717 | |
2718 | dev_maps = xmap_dereference(dev->xps_maps[type]); | |
2719 | if (type == XPS_RXQS) { | |
80d19669 | 2720 | maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); |
80d19669 AN |
2721 | nr_ids = dev->num_rx_queues; |
2722 | } else { | |
2723 | maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); | |
6f36158e | 2724 | if (num_possible_cpus() > 1) |
80d19669 | 2725 | online_mask = cpumask_bits(cpu_online_mask); |
80d19669 AN |
2726 | nr_ids = nr_cpu_ids; |
2727 | } | |
537c00de | 2728 | |
80d19669 AN |
2729 | if (maps_sz < L1_CACHE_BYTES) |
2730 | maps_sz = L1_CACHE_BYTES; | |
537c00de | 2731 | |
255c04a8 | 2732 | /* The old dev_maps could be larger or smaller than the one we're |
5478fcd0 AT |
2733 | * setting up now, as dev->num_tc or nr_ids could have been updated in |
2734 | * between. We could try to be smart, but let's be safe instead and only | |
2735 | * copy foreign traffic classes if the two map sizes match. | |
255c04a8 | 2736 | */ |
5478fcd0 AT |
2737 | if (dev_maps && |
2738 | dev_maps->num_tc == num_tc && dev_maps->nr_ids == nr_ids) | |
255c04a8 AT |
2739 | copy = true; |
2740 | ||
01c5f864 | 2741 | /* allocate memory for queue storage */ |
80d19669 AN |
2742 | for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), |
2743 | j < nr_ids;) { | |
2bb60cb9 | 2744 | if (!new_dev_maps) { |
255c04a8 AT |
2745 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); |
2746 | if (!new_dev_maps) { | |
2747 | mutex_unlock(&xps_map_mutex); | |
2748 | return -ENOMEM; | |
2749 | } | |
2750 | ||
5478fcd0 | 2751 | new_dev_maps->nr_ids = nr_ids; |
255c04a8 | 2752 | new_dev_maps->num_tc = num_tc; |
2bb60cb9 | 2753 | } |
01c5f864 | 2754 | |
80d19669 | 2755 | tci = j * num_tc + tc; |
255c04a8 | 2756 | map = copy ? xmap_dereference(dev_maps->attr_map[tci]) : NULL; |
01c5f864 | 2757 | |
044ab86d | 2758 | map = expand_xps_map(map, j, index, type == XPS_RXQS); |
01c5f864 AD |
2759 | if (!map) |
2760 | goto error; | |
2761 | ||
80d19669 | 2762 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
01c5f864 AD |
2763 | } |
2764 | ||
2765 | if (!new_dev_maps) | |
2766 | goto out_no_new_maps; | |
2767 | ||
867d0ad4 SD |
2768 | if (!dev_maps) { |
2769 | /* Increment static keys at most once per type */ | |
2770 | static_key_slow_inc_cpuslocked(&xps_needed); | |
044ab86d | 2771 | if (type == XPS_RXQS) |
867d0ad4 SD |
2772 | static_key_slow_inc_cpuslocked(&xps_rxqs_needed); |
2773 | } | |
04157469 | 2774 | |
6f36158e | 2775 | for (j = 0; j < nr_ids; j++) { |
402fbb99 | 2776 | bool skip_tc = false; |
184c449f | 2777 | |
80d19669 | 2778 | tci = j * num_tc + tc; |
80d19669 AN |
2779 | if (netif_attr_test_mask(j, mask, nr_ids) && |
2780 | netif_attr_test_online(j, online_mask, nr_ids)) { | |
2781 | /* add tx-queue to CPU/rx-queue maps */ | |
01c5f864 AD |
2782 | int pos = 0; |
2783 | ||
402fbb99 AT |
2784 | skip_tc = true; |
2785 | ||
80d19669 | 2786 | map = xmap_dereference(new_dev_maps->attr_map[tci]); |
01c5f864 AD |
2787 | while ((pos < map->len) && (map->queues[pos] != index)) |
2788 | pos++; | |
2789 | ||
2790 | if (pos == map->len) | |
2791 | map->queues[map->len++] = index; | |
537c00de | 2792 | #ifdef CONFIG_NUMA |
044ab86d | 2793 | if (type == XPS_CPUS) { |
80d19669 AN |
2794 | if (numa_node_id == -2) |
2795 | numa_node_id = cpu_to_node(j); | |
2796 | else if (numa_node_id != cpu_to_node(j)) | |
2797 | numa_node_id = -1; | |
2798 | } | |
537c00de | 2799 | #endif |
537c00de | 2800 | } |
01c5f864 | 2801 | |
402fbb99 AT |
2802 | if (copy) |
2803 | xps_copy_dev_maps(dev_maps, new_dev_maps, j, tc, | |
2804 | skip_tc); | |
537c00de AD |
2805 | } |
2806 | ||
044ab86d | 2807 | rcu_assign_pointer(dev->xps_maps[type], new_dev_maps); |
01c5f864 | 2808 | |
537c00de | 2809 | /* Cleanup old maps */ |
184c449f AD |
2810 | if (!dev_maps) |
2811 | goto out_no_old_maps; | |
2812 | ||
6f36158e | 2813 | for (j = 0; j < dev_maps->nr_ids; j++) { |
255c04a8 | 2814 | for (i = num_tc, tci = j * dev_maps->num_tc; i--; tci++) { |
80d19669 | 2815 | map = xmap_dereference(dev_maps->attr_map[tci]); |
255c04a8 AT |
2816 | if (!map) |
2817 | continue; | |
2818 | ||
2819 | if (copy) { | |
2820 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
2821 | if (map == new_map) | |
2822 | continue; | |
2823 | } | |
2824 | ||
75b2758a | 2825 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
255c04a8 | 2826 | kfree_rcu(map, rcu); |
01c5f864 | 2827 | } |
537c00de AD |
2828 | } |
2829 | ||
2d05bf01 | 2830 | old_dev_maps = dev_maps; |
184c449f AD |
2831 | |
2832 | out_no_old_maps: | |
01c5f864 AD |
2833 | dev_maps = new_dev_maps; |
2834 | active = true; | |
537c00de | 2835 | |
01c5f864 | 2836 | out_no_new_maps: |
044ab86d | 2837 | if (type == XPS_CPUS) |
80d19669 AN |
2838 | /* update Tx queue numa node */ |
2839 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), | |
2840 | (numa_node_id >= 0) ? | |
2841 | numa_node_id : NUMA_NO_NODE); | |
537c00de | 2842 | |
01c5f864 AD |
2843 | if (!dev_maps) |
2844 | goto out_no_maps; | |
2845 | ||
80d19669 | 2846 | /* removes tx-queue from unused CPUs/rx-queues */ |
6f36158e | 2847 | for (j = 0; j < dev_maps->nr_ids; j++) { |
132f743b AT |
2848 | tci = j * dev_maps->num_tc; |
2849 | ||
2850 | for (i = 0; i < dev_maps->num_tc; i++, tci++) { | |
2851 | if (i == tc && | |
2852 | netif_attr_test_mask(j, mask, dev_maps->nr_ids) && | |
2853 | netif_attr_test_online(j, online_mask, dev_maps->nr_ids)) | |
2854 | continue; | |
2855 | ||
2d05bf01 AT |
2856 | active |= remove_xps_queue(dev_maps, |
2857 | copy ? old_dev_maps : NULL, | |
2858 | tci, index); | |
132f743b | 2859 | } |
01c5f864 AD |
2860 | } |
2861 | ||
2d05bf01 AT |
2862 | if (old_dev_maps) |
2863 | kfree_rcu(old_dev_maps, rcu); | |
2864 | ||
01c5f864 | 2865 | /* free map if not active */ |
867d0ad4 | 2866 | if (!active) |
044ab86d | 2867 | reset_xps_maps(dev, dev_maps, type); |
01c5f864 AD |
2868 | |
2869 | out_no_maps: | |
537c00de AD |
2870 | mutex_unlock(&xps_map_mutex); |
2871 | ||
2872 | return 0; | |
2873 | error: | |
01c5f864 | 2874 | /* remove any maps that we added */ |
6f36158e | 2875 | for (j = 0; j < nr_ids; j++) { |
80d19669 AN |
2876 | for (i = num_tc, tci = j * num_tc; i--; tci++) { |
2877 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
255c04a8 | 2878 | map = copy ? |
80d19669 | 2879 | xmap_dereference(dev_maps->attr_map[tci]) : |
184c449f AD |
2880 | NULL; |
2881 | if (new_map && new_map != map) | |
2882 | kfree(new_map); | |
2883 | } | |
01c5f864 AD |
2884 | } |
2885 | ||
537c00de AD |
2886 | mutex_unlock(&xps_map_mutex); |
2887 | ||
537c00de AD |
2888 | kfree(new_dev_maps); |
2889 | return -ENOMEM; | |
2890 | } | |
4d99f660 | 2891 | EXPORT_SYMBOL_GPL(__netif_set_xps_queue); |
80d19669 AN |
2892 | |
2893 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, | |
2894 | u16 index) | |
2895 | { | |
4d99f660 AV |
2896 | int ret; |
2897 | ||
2898 | cpus_read_lock(); | |
044ab86d | 2899 | ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, XPS_CPUS); |
4d99f660 AV |
2900 | cpus_read_unlock(); |
2901 | ||
2902 | return ret; | |
80d19669 | 2903 | } |
537c00de AD |
2904 | EXPORT_SYMBOL(netif_set_xps_queue); |
2905 | ||
2906 | #endif | |
ffcfe25b AD |
2907 | static void netdev_unbind_all_sb_channels(struct net_device *dev) |
2908 | { | |
2909 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2910 | ||
2911 | /* Unbind any subordinate channels */ | |
2912 | while (txq-- != &dev->_tx[0]) { | |
2913 | if (txq->sb_dev) | |
2914 | netdev_unbind_sb_channel(dev, txq->sb_dev); | |
2915 | } | |
2916 | } | |
2917 | ||
9cf1f6a8 AD |
2918 | void netdev_reset_tc(struct net_device *dev) |
2919 | { | |
6234f874 AD |
2920 | #ifdef CONFIG_XPS |
2921 | netif_reset_xps_queues_gt(dev, 0); | |
2922 | #endif | |
ffcfe25b AD |
2923 | netdev_unbind_all_sb_channels(dev); |
2924 | ||
2925 | /* Reset TC configuration of device */ | |
9cf1f6a8 AD |
2926 | dev->num_tc = 0; |
2927 | memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); | |
2928 | memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); | |
2929 | } | |
2930 | EXPORT_SYMBOL(netdev_reset_tc); | |
2931 | ||
2932 | int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) | |
2933 | { | |
2934 | if (tc >= dev->num_tc) | |
2935 | return -EINVAL; | |
2936 | ||
6234f874 AD |
2937 | #ifdef CONFIG_XPS |
2938 | netif_reset_xps_queues(dev, offset, count); | |
2939 | #endif | |
9cf1f6a8 AD |
2940 | dev->tc_to_txq[tc].count = count; |
2941 | dev->tc_to_txq[tc].offset = offset; | |
2942 | return 0; | |
2943 | } | |
2944 | EXPORT_SYMBOL(netdev_set_tc_queue); | |
2945 | ||
2946 | int netdev_set_num_tc(struct net_device *dev, u8 num_tc) | |
2947 | { | |
2948 | if (num_tc > TC_MAX_QUEUE) | |
2949 | return -EINVAL; | |
2950 | ||
6234f874 AD |
2951 | #ifdef CONFIG_XPS |
2952 | netif_reset_xps_queues_gt(dev, 0); | |
2953 | #endif | |
ffcfe25b AD |
2954 | netdev_unbind_all_sb_channels(dev); |
2955 | ||
9cf1f6a8 AD |
2956 | dev->num_tc = num_tc; |
2957 | return 0; | |
2958 | } | |
2959 | EXPORT_SYMBOL(netdev_set_num_tc); | |
2960 | ||
ffcfe25b AD |
2961 | void netdev_unbind_sb_channel(struct net_device *dev, |
2962 | struct net_device *sb_dev) | |
2963 | { | |
2964 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2965 | ||
2966 | #ifdef CONFIG_XPS | |
2967 | netif_reset_xps_queues_gt(sb_dev, 0); | |
2968 | #endif | |
2969 | memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq)); | |
2970 | memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map)); | |
2971 | ||
2972 | while (txq-- != &dev->_tx[0]) { | |
2973 | if (txq->sb_dev == sb_dev) | |
2974 | txq->sb_dev = NULL; | |
2975 | } | |
2976 | } | |
2977 | EXPORT_SYMBOL(netdev_unbind_sb_channel); | |
2978 | ||
2979 | int netdev_bind_sb_channel_queue(struct net_device *dev, | |
2980 | struct net_device *sb_dev, | |
2981 | u8 tc, u16 count, u16 offset) | |
2982 | { | |
2983 | /* Make certain the sb_dev and dev are already configured */ | |
2984 | if (sb_dev->num_tc >= 0 || tc >= dev->num_tc) | |
2985 | return -EINVAL; | |
2986 | ||
2987 | /* We cannot hand out queues we don't have */ | |
2988 | if ((offset + count) > dev->real_num_tx_queues) | |
2989 | return -EINVAL; | |
2990 | ||
2991 | /* Record the mapping */ | |
2992 | sb_dev->tc_to_txq[tc].count = count; | |
2993 | sb_dev->tc_to_txq[tc].offset = offset; | |
2994 | ||
2995 | /* Provide a way for Tx queue to find the tc_to_txq map or | |
2996 | * XPS map for itself. | |
2997 | */ | |
2998 | while (count--) | |
2999 | netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev; | |
3000 | ||
3001 | return 0; | |
3002 | } | |
3003 | EXPORT_SYMBOL(netdev_bind_sb_channel_queue); | |
3004 | ||
3005 | int netdev_set_sb_channel(struct net_device *dev, u16 channel) | |
3006 | { | |
3007 | /* Do not use a multiqueue device to represent a subordinate channel */ | |
3008 | if (netif_is_multiqueue(dev)) | |
3009 | return -ENODEV; | |
3010 | ||
3011 | /* We allow channels 1 - 32767 to be used for subordinate channels. | |
3012 | * Channel 0 is meant to be "native" mode and used only to represent | |
3013 | * the main root device. We allow writing 0 to reset the device back | |
3014 | * to normal mode after being used as a subordinate channel. | |
3015 | */ | |
3016 | if (channel > S16_MAX) | |
3017 | return -EINVAL; | |
3018 | ||
3019 | dev->num_tc = -channel; | |
3020 | ||
3021 | return 0; | |
3022 | } | |
3023 | EXPORT_SYMBOL(netdev_set_sb_channel); | |
3024 | ||
f0796d5c JF |
3025 | /* |
3026 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
3a053b1a | 3027 | * greater than real_num_tx_queues stale skbs on the qdisc must be flushed. |
f0796d5c | 3028 | */ |
e6484930 | 3029 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 3030 | { |
ac5b7019 | 3031 | bool disabling; |
1d24eb48 TH |
3032 | int rc; |
3033 | ||
ac5b7019 JK |
3034 | disabling = txq < dev->real_num_tx_queues; |
3035 | ||
e6484930 TH |
3036 | if (txq < 1 || txq > dev->num_tx_queues) |
3037 | return -EINVAL; | |
f0796d5c | 3038 | |
5c56580b BH |
3039 | if (dev->reg_state == NETREG_REGISTERED || |
3040 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
3041 | ASSERT_RTNL(); |
3042 | ||
1d24eb48 TH |
3043 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
3044 | txq); | |
bf264145 TH |
3045 | if (rc) |
3046 | return rc; | |
3047 | ||
4f57c087 JF |
3048 | if (dev->num_tc) |
3049 | netif_setup_tc(dev, txq); | |
3050 | ||
ac5b7019 JK |
3051 | dev->real_num_tx_queues = txq; |
3052 | ||
3053 | if (disabling) { | |
3054 | synchronize_net(); | |
e6484930 | 3055 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
3056 | #ifdef CONFIG_XPS |
3057 | netif_reset_xps_queues_gt(dev, txq); | |
3058 | #endif | |
3059 | } | |
ac5b7019 JK |
3060 | } else { |
3061 | dev->real_num_tx_queues = txq; | |
f0796d5c | 3062 | } |
e6484930 | 3063 | |
e6484930 | 3064 | return 0; |
f0796d5c JF |
3065 | } |
3066 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 3067 | |
a953be53 | 3068 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
3069 | /** |
3070 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
3071 | * @dev: Network device | |
3072 | * @rxq: Actual number of RX queues | |
3073 | * | |
3074 | * This must be called either with the rtnl_lock held or before | |
3075 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
3076 | * negative error code. If called before registration, it always |
3077 | * succeeds. | |
62fe0b40 BH |
3078 | */ |
3079 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
3080 | { | |
3081 | int rc; | |
3082 | ||
bd25fa7b TH |
3083 | if (rxq < 1 || rxq > dev->num_rx_queues) |
3084 | return -EINVAL; | |
3085 | ||
62fe0b40 BH |
3086 | if (dev->reg_state == NETREG_REGISTERED) { |
3087 | ASSERT_RTNL(); | |
3088 | ||
62fe0b40 BH |
3089 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
3090 | rxq); | |
3091 | if (rc) | |
3092 | return rc; | |
62fe0b40 BH |
3093 | } |
3094 | ||
3095 | dev->real_num_rx_queues = rxq; | |
3096 | return 0; | |
3097 | } | |
3098 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
3099 | #endif | |
3100 | ||
2c53040f BH |
3101 | /** |
3102 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
3103 | * |
3104 | * This routine should set an upper limit on the number of RSS queues | |
3105 | * used by default by multiqueue devices. | |
3106 | */ | |
a55b138b | 3107 | int netif_get_num_default_rss_queues(void) |
16917b87 | 3108 | { |
40e4e713 HS |
3109 | return is_kdump_kernel() ? |
3110 | 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
16917b87 YM |
3111 | } |
3112 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
3113 | ||
3bcb846c | 3114 | static void __netif_reschedule(struct Qdisc *q) |
56079431 | 3115 | { |
def82a1d JP |
3116 | struct softnet_data *sd; |
3117 | unsigned long flags; | |
56079431 | 3118 | |
def82a1d | 3119 | local_irq_save(flags); |
903ceff7 | 3120 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
3121 | q->next_sched = NULL; |
3122 | *sd->output_queue_tailp = q; | |
3123 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
3124 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
3125 | local_irq_restore(flags); | |
3126 | } | |
3127 | ||
3128 | void __netif_schedule(struct Qdisc *q) | |
3129 | { | |
3130 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
3131 | __netif_reschedule(q); | |
56079431 DV |
3132 | } |
3133 | EXPORT_SYMBOL(__netif_schedule); | |
3134 | ||
e6247027 ED |
3135 | struct dev_kfree_skb_cb { |
3136 | enum skb_free_reason reason; | |
3137 | }; | |
3138 | ||
3139 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 3140 | { |
e6247027 ED |
3141 | return (struct dev_kfree_skb_cb *)skb->cb; |
3142 | } | |
3143 | ||
46e5da40 JF |
3144 | void netif_schedule_queue(struct netdev_queue *txq) |
3145 | { | |
3146 | rcu_read_lock(); | |
5be5515a | 3147 | if (!netif_xmit_stopped(txq)) { |
46e5da40 JF |
3148 | struct Qdisc *q = rcu_dereference(txq->qdisc); |
3149 | ||
3150 | __netif_schedule(q); | |
3151 | } | |
3152 | rcu_read_unlock(); | |
3153 | } | |
3154 | EXPORT_SYMBOL(netif_schedule_queue); | |
3155 | ||
46e5da40 JF |
3156 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
3157 | { | |
3158 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
3159 | struct Qdisc *q; | |
3160 | ||
3161 | rcu_read_lock(); | |
3162 | q = rcu_dereference(dev_queue->qdisc); | |
3163 | __netif_schedule(q); | |
3164 | rcu_read_unlock(); | |
3165 | } | |
3166 | } | |
3167 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
3168 | ||
e6247027 | 3169 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 3170 | { |
e6247027 | 3171 | unsigned long flags; |
56079431 | 3172 | |
9899886d MJ |
3173 | if (unlikely(!skb)) |
3174 | return; | |
3175 | ||
63354797 | 3176 | if (likely(refcount_read(&skb->users) == 1)) { |
e6247027 | 3177 | smp_rmb(); |
63354797 RE |
3178 | refcount_set(&skb->users, 0); |
3179 | } else if (likely(!refcount_dec_and_test(&skb->users))) { | |
e6247027 | 3180 | return; |
bea3348e | 3181 | } |
e6247027 ED |
3182 | get_kfree_skb_cb(skb)->reason = reason; |
3183 | local_irq_save(flags); | |
3184 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
3185 | __this_cpu_write(softnet_data.completion_queue, skb); | |
3186 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
3187 | local_irq_restore(flags); | |
56079431 | 3188 | } |
e6247027 | 3189 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 3190 | |
e6247027 | 3191 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
3192 | { |
3193 | if (in_irq() || irqs_disabled()) | |
e6247027 | 3194 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
3195 | else |
3196 | dev_kfree_skb(skb); | |
3197 | } | |
e6247027 | 3198 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
3199 | |
3200 | ||
bea3348e SH |
3201 | /** |
3202 | * netif_device_detach - mark device as removed | |
3203 | * @dev: network device | |
3204 | * | |
3205 | * Mark device as removed from system and therefore no longer available. | |
3206 | */ | |
56079431 DV |
3207 | void netif_device_detach(struct net_device *dev) |
3208 | { | |
3209 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
3210 | netif_running(dev)) { | |
d543103a | 3211 | netif_tx_stop_all_queues(dev); |
56079431 DV |
3212 | } |
3213 | } | |
3214 | EXPORT_SYMBOL(netif_device_detach); | |
3215 | ||
bea3348e SH |
3216 | /** |
3217 | * netif_device_attach - mark device as attached | |
3218 | * @dev: network device | |
3219 | * | |
3220 | * Mark device as attached from system and restart if needed. | |
3221 | */ | |
56079431 DV |
3222 | void netif_device_attach(struct net_device *dev) |
3223 | { | |
3224 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
3225 | netif_running(dev)) { | |
d543103a | 3226 | netif_tx_wake_all_queues(dev); |
4ec93edb | 3227 | __netdev_watchdog_up(dev); |
56079431 DV |
3228 | } |
3229 | } | |
3230 | EXPORT_SYMBOL(netif_device_attach); | |
3231 | ||
5605c762 JP |
3232 | /* |
3233 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
3234 | * to be used as a distribution range. | |
3235 | */ | |
eadec877 AD |
3236 | static u16 skb_tx_hash(const struct net_device *dev, |
3237 | const struct net_device *sb_dev, | |
3238 | struct sk_buff *skb) | |
5605c762 JP |
3239 | { |
3240 | u32 hash; | |
3241 | u16 qoffset = 0; | |
1b837d48 | 3242 | u16 qcount = dev->real_num_tx_queues; |
5605c762 | 3243 | |
eadec877 AD |
3244 | if (dev->num_tc) { |
3245 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
3246 | ||
3247 | qoffset = sb_dev->tc_to_txq[tc].offset; | |
3248 | qcount = sb_dev->tc_to_txq[tc].count; | |
3249 | } | |
3250 | ||
5605c762 JP |
3251 | if (skb_rx_queue_recorded(skb)) { |
3252 | hash = skb_get_rx_queue(skb); | |
6e11d157 AN |
3253 | if (hash >= qoffset) |
3254 | hash -= qoffset; | |
1b837d48 AD |
3255 | while (unlikely(hash >= qcount)) |
3256 | hash -= qcount; | |
eadec877 | 3257 | return hash + qoffset; |
5605c762 JP |
3258 | } |
3259 | ||
3260 | return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; | |
3261 | } | |
5605c762 | 3262 | |
36c92474 BH |
3263 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
3264 | { | |
84d15ae5 | 3265 | static const netdev_features_t null_features; |
36c92474 | 3266 | struct net_device *dev = skb->dev; |
88ad4175 | 3267 | const char *name = ""; |
36c92474 | 3268 | |
c846ad9b BG |
3269 | if (!net_ratelimit()) |
3270 | return; | |
3271 | ||
88ad4175 BM |
3272 | if (dev) { |
3273 | if (dev->dev.parent) | |
3274 | name = dev_driver_string(dev->dev.parent); | |
3275 | else | |
3276 | name = netdev_name(dev); | |
3277 | } | |
6413139d WB |
3278 | skb_dump(KERN_WARNING, skb, false); |
3279 | WARN(1, "%s: caps=(%pNF, %pNF)\n", | |
88ad4175 | 3280 | name, dev ? &dev->features : &null_features, |
6413139d | 3281 | skb->sk ? &skb->sk->sk_route_caps : &null_features); |
36c92474 BH |
3282 | } |
3283 | ||
1da177e4 LT |
3284 | /* |
3285 | * Invalidate hardware checksum when packet is to be mangled, and | |
3286 | * complete checksum manually on outgoing path. | |
3287 | */ | |
84fa7933 | 3288 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 3289 | { |
d3bc23e7 | 3290 | __wsum csum; |
663ead3b | 3291 | int ret = 0, offset; |
1da177e4 | 3292 | |
84fa7933 | 3293 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
3294 | goto out_set_summed; |
3295 | ||
3aefd7d6 | 3296 | if (unlikely(skb_is_gso(skb))) { |
36c92474 BH |
3297 | skb_warn_bad_offload(skb); |
3298 | return -EINVAL; | |
1da177e4 LT |
3299 | } |
3300 | ||
cef401de ED |
3301 | /* Before computing a checksum, we should make sure no frag could |
3302 | * be modified by an external entity : checksum could be wrong. | |
3303 | */ | |
3304 | if (skb_has_shared_frag(skb)) { | |
3305 | ret = __skb_linearize(skb); | |
3306 | if (ret) | |
3307 | goto out; | |
3308 | } | |
3309 | ||
55508d60 | 3310 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
3311 | BUG_ON(offset >= skb_headlen(skb)); |
3312 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
3313 | ||
3314 | offset += skb->csum_offset; | |
3315 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
3316 | ||
8211fbfa HK |
3317 | ret = skb_ensure_writable(skb, offset + sizeof(__sum16)); |
3318 | if (ret) | |
3319 | goto out; | |
1da177e4 | 3320 | |
4f2e4ad5 | 3321 | *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
a430a43d | 3322 | out_set_summed: |
1da177e4 | 3323 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 3324 | out: |
1da177e4 LT |
3325 | return ret; |
3326 | } | |
d1b19dff | 3327 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 3328 | |
b72b5bf6 DC |
3329 | int skb_crc32c_csum_help(struct sk_buff *skb) |
3330 | { | |
3331 | __le32 crc32c_csum; | |
3332 | int ret = 0, offset, start; | |
3333 | ||
3334 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
3335 | goto out; | |
3336 | ||
3337 | if (unlikely(skb_is_gso(skb))) | |
3338 | goto out; | |
3339 | ||
3340 | /* Before computing a checksum, we should make sure no frag could | |
3341 | * be modified by an external entity : checksum could be wrong. | |
3342 | */ | |
3343 | if (unlikely(skb_has_shared_frag(skb))) { | |
3344 | ret = __skb_linearize(skb); | |
3345 | if (ret) | |
3346 | goto out; | |
3347 | } | |
3348 | start = skb_checksum_start_offset(skb); | |
3349 | offset = start + offsetof(struct sctphdr, checksum); | |
3350 | if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { | |
3351 | ret = -EINVAL; | |
3352 | goto out; | |
3353 | } | |
8211fbfa HK |
3354 | |
3355 | ret = skb_ensure_writable(skb, offset + sizeof(__le32)); | |
3356 | if (ret) | |
3357 | goto out; | |
3358 | ||
b72b5bf6 DC |
3359 | crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start, |
3360 | skb->len - start, ~(__u32)0, | |
3361 | crc32c_csum_stub)); | |
3362 | *(__le32 *)(skb->data + offset) = crc32c_csum; | |
3363 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 3364 | skb->csum_not_inet = 0; |
b72b5bf6 DC |
3365 | out: |
3366 | return ret; | |
3367 | } | |
3368 | ||
53d6471c | 3369 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 3370 | { |
252e3346 | 3371 | __be16 type = skb->protocol; |
f6a78bfc | 3372 | |
19acc327 PS |
3373 | /* Tunnel gso handlers can set protocol to ethernet. */ |
3374 | if (type == htons(ETH_P_TEB)) { | |
3375 | struct ethhdr *eth; | |
3376 | ||
3377 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
3378 | return 0; | |
3379 | ||
1dfe82eb | 3380 | eth = (struct ethhdr *)skb->data; |
19acc327 PS |
3381 | type = eth->h_proto; |
3382 | } | |
3383 | ||
d4bcef3f | 3384 | return __vlan_get_protocol(skb, type, depth); |
ec5f0615 PS |
3385 | } |
3386 | ||
3387 | /** | |
3388 | * skb_mac_gso_segment - mac layer segmentation handler. | |
3389 | * @skb: buffer to segment | |
3390 | * @features: features for the output path (see dev->features) | |
3391 | */ | |
3392 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
3393 | netdev_features_t features) | |
3394 | { | |
3395 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
3396 | struct packet_offload *ptype; | |
53d6471c VY |
3397 | int vlan_depth = skb->mac_len; |
3398 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
3399 | |
3400 | if (unlikely(!type)) | |
3401 | return ERR_PTR(-EINVAL); | |
3402 | ||
53d6471c | 3403 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
3404 | |
3405 | rcu_read_lock(); | |
22061d80 | 3406 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 3407 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 3408 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
3409 | break; |
3410 | } | |
3411 | } | |
3412 | rcu_read_unlock(); | |
3413 | ||
98e399f8 | 3414 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 3415 | |
f6a78bfc HX |
3416 | return segs; |
3417 | } | |
05e8ef4a PS |
3418 | EXPORT_SYMBOL(skb_mac_gso_segment); |
3419 | ||
3420 | ||
3421 | /* openvswitch calls this on rx path, so we need a different check. | |
3422 | */ | |
3423 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
3424 | { | |
3425 | if (tx_path) | |
0c19f846 WB |
3426 | return skb->ip_summed != CHECKSUM_PARTIAL && |
3427 | skb->ip_summed != CHECKSUM_UNNECESSARY; | |
6e7bc478 ED |
3428 | |
3429 | return skb->ip_summed == CHECKSUM_NONE; | |
05e8ef4a PS |
3430 | } |
3431 | ||
3432 | /** | |
3433 | * __skb_gso_segment - Perform segmentation on skb. | |
3434 | * @skb: buffer to segment | |
3435 | * @features: features for the output path (see dev->features) | |
3436 | * @tx_path: whether it is called in TX path | |
3437 | * | |
3438 | * This function segments the given skb and returns a list of segments. | |
3439 | * | |
3440 | * It may return NULL if the skb requires no segmentation. This is | |
3441 | * only possible when GSO is used for verifying header integrity. | |
9207f9d4 | 3442 | * |
a08e7fd9 | 3443 | * Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb. |
05e8ef4a PS |
3444 | */ |
3445 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
3446 | netdev_features_t features, bool tx_path) | |
3447 | { | |
b2504a5d ED |
3448 | struct sk_buff *segs; |
3449 | ||
05e8ef4a PS |
3450 | if (unlikely(skb_needs_check(skb, tx_path))) { |
3451 | int err; | |
3452 | ||
b2504a5d | 3453 | /* We're going to init ->check field in TCP or UDP header */ |
a40e0a66 | 3454 | err = skb_cow_head(skb, 0); |
3455 | if (err < 0) | |
05e8ef4a PS |
3456 | return ERR_PTR(err); |
3457 | } | |
3458 | ||
802ab55a AD |
3459 | /* Only report GSO partial support if it will enable us to |
3460 | * support segmentation on this frame without needing additional | |
3461 | * work. | |
3462 | */ | |
3463 | if (features & NETIF_F_GSO_PARTIAL) { | |
3464 | netdev_features_t partial_features = NETIF_F_GSO_ROBUST; | |
3465 | struct net_device *dev = skb->dev; | |
3466 | ||
3467 | partial_features |= dev->features & dev->gso_partial_features; | |
3468 | if (!skb_gso_ok(skb, features | partial_features)) | |
3469 | features &= ~NETIF_F_GSO_PARTIAL; | |
3470 | } | |
3471 | ||
a08e7fd9 | 3472 | BUILD_BUG_ON(SKB_GSO_CB_OFFSET + |
9207f9d4 KK |
3473 | sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb)); |
3474 | ||
68c33163 | 3475 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
3476 | SKB_GSO_CB(skb)->encap_level = 0; |
3477 | ||
05e8ef4a PS |
3478 | skb_reset_mac_header(skb); |
3479 | skb_reset_mac_len(skb); | |
3480 | ||
b2504a5d ED |
3481 | segs = skb_mac_gso_segment(skb, features); |
3482 | ||
3a1296a3 | 3483 | if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs))) |
b2504a5d ED |
3484 | skb_warn_bad_offload(skb); |
3485 | ||
3486 | return segs; | |
05e8ef4a | 3487 | } |
12b0004d | 3488 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 3489 | |
fb286bb2 HX |
3490 | /* Take action when hardware reception checksum errors are detected. */ |
3491 | #ifdef CONFIG_BUG | |
127d7355 TL |
3492 | static void do_netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
3493 | { | |
3494 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); | |
3495 | skb_dump(KERN_ERR, skb, true); | |
3496 | dump_stack(); | |
3497 | } | |
3498 | ||
7fe50ac8 | 3499 | void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
fb286bb2 | 3500 | { |
127d7355 | 3501 | DO_ONCE_LITE(do_netdev_rx_csum_fault, dev, skb); |
fb286bb2 HX |
3502 | } |
3503 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
3504 | #endif | |
3505 | ||
ab74cfeb | 3506 | /* XXX: check that highmem exists at all on the given machine. */ |
c1e756bf | 3507 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 3508 | { |
3d3a8533 | 3509 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 3510 | int i; |
f4563a75 | 3511 | |
5acbbd42 | 3512 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
3513 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
3514 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
f4563a75 | 3515 | |
ea2ab693 | 3516 | if (PageHighMem(skb_frag_page(frag))) |
5acbbd42 | 3517 | return 1; |
ea2ab693 | 3518 | } |
5acbbd42 | 3519 | } |
3d3a8533 | 3520 | #endif |
1da177e4 LT |
3521 | return 0; |
3522 | } | |
1da177e4 | 3523 | |
3b392ddb SH |
3524 | /* If MPLS offload request, verify we are testing hardware MPLS features |
3525 | * instead of standard features for the netdev. | |
3526 | */ | |
d0edc7bf | 3527 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
3528 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
3529 | netdev_features_t features, | |
3530 | __be16 type) | |
3531 | { | |
25cd9ba0 | 3532 | if (eth_p_mpls(type)) |
3b392ddb SH |
3533 | features &= skb->dev->mpls_features; |
3534 | ||
3535 | return features; | |
3536 | } | |
3537 | #else | |
3538 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
3539 | netdev_features_t features, | |
3540 | __be16 type) | |
3541 | { | |
3542 | return features; | |
3543 | } | |
3544 | #endif | |
3545 | ||
c8f44aff | 3546 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 3547 | netdev_features_t features) |
f01a5236 | 3548 | { |
3b392ddb SH |
3549 | __be16 type; |
3550 | ||
9fc95f50 | 3551 | type = skb_network_protocol(skb, NULL); |
3b392ddb | 3552 | features = net_mpls_features(skb, features, type); |
53d6471c | 3553 | |
c0d680e5 | 3554 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 3555 | !can_checksum_protocol(features, type)) { |
996e8021 | 3556 | features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
f01a5236 | 3557 | } |
7be2c82c ED |
3558 | if (illegal_highdma(skb->dev, skb)) |
3559 | features &= ~NETIF_F_SG; | |
f01a5236 JG |
3560 | |
3561 | return features; | |
3562 | } | |
3563 | ||
e38f3025 TM |
3564 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
3565 | struct net_device *dev, | |
3566 | netdev_features_t features) | |
3567 | { | |
3568 | return features; | |
3569 | } | |
3570 | EXPORT_SYMBOL(passthru_features_check); | |
3571 | ||
7ce23672 | 3572 | static netdev_features_t dflt_features_check(struct sk_buff *skb, |
8cb65d00 TM |
3573 | struct net_device *dev, |
3574 | netdev_features_t features) | |
3575 | { | |
3576 | return vlan_features_check(skb, features); | |
3577 | } | |
3578 | ||
cbc53e08 AD |
3579 | static netdev_features_t gso_features_check(const struct sk_buff *skb, |
3580 | struct net_device *dev, | |
3581 | netdev_features_t features) | |
3582 | { | |
3583 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
3584 | ||
3585 | if (gso_segs > dev->gso_max_segs) | |
3586 | return features & ~NETIF_F_GSO_MASK; | |
3587 | ||
1d155dfd HK |
3588 | if (!skb_shinfo(skb)->gso_type) { |
3589 | skb_warn_bad_offload(skb); | |
3590 | return features & ~NETIF_F_GSO_MASK; | |
3591 | } | |
3592 | ||
802ab55a AD |
3593 | /* Support for GSO partial features requires software |
3594 | * intervention before we can actually process the packets | |
3595 | * so we need to strip support for any partial features now | |
3596 | * and we can pull them back in after we have partially | |
3597 | * segmented the frame. | |
3598 | */ | |
3599 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) | |
3600 | features &= ~dev->gso_partial_features; | |
3601 | ||
3602 | /* Make sure to clear the IPv4 ID mangling feature if the | |
3603 | * IPv4 header has the potential to be fragmented. | |
cbc53e08 AD |
3604 | */ |
3605 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
3606 | struct iphdr *iph = skb->encapsulation ? | |
3607 | inner_ip_hdr(skb) : ip_hdr(skb); | |
3608 | ||
3609 | if (!(iph->frag_off & htons(IP_DF))) | |
3610 | features &= ~NETIF_F_TSO_MANGLEID; | |
3611 | } | |
3612 | ||
3613 | return features; | |
3614 | } | |
3615 | ||
c1e756bf | 3616 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 3617 | { |
5f35227e | 3618 | struct net_device *dev = skb->dev; |
fcbeb976 | 3619 | netdev_features_t features = dev->features; |
58e998c6 | 3620 | |
cbc53e08 AD |
3621 | if (skb_is_gso(skb)) |
3622 | features = gso_features_check(skb, dev, features); | |
30b678d8 | 3623 | |
5f35227e JG |
3624 | /* If encapsulation offload request, verify we are testing |
3625 | * hardware encapsulation features instead of standard | |
3626 | * features for the netdev | |
3627 | */ | |
3628 | if (skb->encapsulation) | |
3629 | features &= dev->hw_enc_features; | |
3630 | ||
f5a7fb88 TM |
3631 | if (skb_vlan_tagged(skb)) |
3632 | features = netdev_intersect_features(features, | |
3633 | dev->vlan_features | | |
3634 | NETIF_F_HW_VLAN_CTAG_TX | | |
3635 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 3636 | |
5f35227e JG |
3637 | if (dev->netdev_ops->ndo_features_check) |
3638 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
3639 | features); | |
8cb65d00 TM |
3640 | else |
3641 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 3642 | |
c1e756bf | 3643 | return harmonize_features(skb, features); |
58e998c6 | 3644 | } |
c1e756bf | 3645 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 3646 | |
2ea25513 | 3647 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 3648 | struct netdev_queue *txq, bool more) |
f6a78bfc | 3649 | { |
2ea25513 DM |
3650 | unsigned int len; |
3651 | int rc; | |
00829823 | 3652 | |
9f9a742d | 3653 | if (dev_nit_active(dev)) |
2ea25513 | 3654 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 3655 | |
2ea25513 | 3656 | len = skb->len; |
3744741a | 3657 | PRANDOM_ADD_NOISE(skb, dev, txq, len + jiffies); |
2ea25513 | 3658 | trace_net_dev_start_xmit(skb, dev); |
95f6b3dd | 3659 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 3660 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 3661 | |
2ea25513 DM |
3662 | return rc; |
3663 | } | |
7b9c6090 | 3664 | |
8dcda22a DM |
3665 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
3666 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
3667 | { |
3668 | struct sk_buff *skb = first; | |
3669 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 3670 | |
7f2e870f DM |
3671 | while (skb) { |
3672 | struct sk_buff *next = skb->next; | |
fc70fb64 | 3673 | |
a8305bff | 3674 | skb_mark_not_on_list(skb); |
95f6b3dd | 3675 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
3676 | if (unlikely(!dev_xmit_complete(rc))) { |
3677 | skb->next = next; | |
3678 | goto out; | |
3679 | } | |
6afff0ca | 3680 | |
7f2e870f | 3681 | skb = next; |
fe60faa5 | 3682 | if (netif_tx_queue_stopped(txq) && skb) { |
7f2e870f DM |
3683 | rc = NETDEV_TX_BUSY; |
3684 | break; | |
9ccb8975 | 3685 | } |
7f2e870f | 3686 | } |
9ccb8975 | 3687 | |
7f2e870f DM |
3688 | out: |
3689 | *ret = rc; | |
3690 | return skb; | |
3691 | } | |
b40863c6 | 3692 | |
1ff0dc94 ED |
3693 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
3694 | netdev_features_t features) | |
f6a78bfc | 3695 | { |
df8a39de | 3696 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
3697 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
3698 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
3699 | return skb; |
3700 | } | |
f6a78bfc | 3701 | |
43c26a1a DC |
3702 | int skb_csum_hwoffload_help(struct sk_buff *skb, |
3703 | const netdev_features_t features) | |
3704 | { | |
fa821170 | 3705 | if (unlikely(skb_csum_is_sctp(skb))) |
43c26a1a DC |
3706 | return !!(features & NETIF_F_SCTP_CRC) ? 0 : |
3707 | skb_crc32c_csum_help(skb); | |
3708 | ||
62fafcd6 XL |
3709 | if (features & NETIF_F_HW_CSUM) |
3710 | return 0; | |
3711 | ||
3712 | if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { | |
3713 | switch (skb->csum_offset) { | |
3714 | case offsetof(struct tcphdr, check): | |
3715 | case offsetof(struct udphdr, check): | |
3716 | return 0; | |
3717 | } | |
3718 | } | |
3719 | ||
3720 | return skb_checksum_help(skb); | |
43c26a1a DC |
3721 | } |
3722 | EXPORT_SYMBOL(skb_csum_hwoffload_help); | |
3723 | ||
f53c7239 | 3724 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again) |
eae3f88e DM |
3725 | { |
3726 | netdev_features_t features; | |
f6a78bfc | 3727 | |
eae3f88e DM |
3728 | features = netif_skb_features(skb); |
3729 | skb = validate_xmit_vlan(skb, features); | |
3730 | if (unlikely(!skb)) | |
3731 | goto out_null; | |
7b9c6090 | 3732 | |
ebf4e808 IL |
3733 | skb = sk_validate_xmit_skb(skb, dev); |
3734 | if (unlikely(!skb)) | |
3735 | goto out_null; | |
3736 | ||
8b86a61d | 3737 | if (netif_needs_gso(skb, features)) { |
ce93718f DM |
3738 | struct sk_buff *segs; |
3739 | ||
3740 | segs = skb_gso_segment(skb, features); | |
cecda693 | 3741 | if (IS_ERR(segs)) { |
af6dabc9 | 3742 | goto out_kfree_skb; |
cecda693 JW |
3743 | } else if (segs) { |
3744 | consume_skb(skb); | |
3745 | skb = segs; | |
f6a78bfc | 3746 | } |
eae3f88e DM |
3747 | } else { |
3748 | if (skb_needs_linearize(skb, features) && | |
3749 | __skb_linearize(skb)) | |
3750 | goto out_kfree_skb; | |
4ec93edb | 3751 | |
eae3f88e DM |
3752 | /* If packet is not checksummed and device does not |
3753 | * support checksumming for this protocol, complete | |
3754 | * checksumming here. | |
3755 | */ | |
3756 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
3757 | if (skb->encapsulation) | |
3758 | skb_set_inner_transport_header(skb, | |
3759 | skb_checksum_start_offset(skb)); | |
3760 | else | |
3761 | skb_set_transport_header(skb, | |
3762 | skb_checksum_start_offset(skb)); | |
43c26a1a | 3763 | if (skb_csum_hwoffload_help(skb, features)) |
eae3f88e | 3764 | goto out_kfree_skb; |
7b9c6090 | 3765 | } |
0c772159 | 3766 | } |
7b9c6090 | 3767 | |
f53c7239 | 3768 | skb = validate_xmit_xfrm(skb, features, again); |
3dca3f38 | 3769 | |
eae3f88e | 3770 | return skb; |
fc70fb64 | 3771 | |
f6a78bfc HX |
3772 | out_kfree_skb: |
3773 | kfree_skb(skb); | |
eae3f88e | 3774 | out_null: |
d21fd63e | 3775 | atomic_long_inc(&dev->tx_dropped); |
eae3f88e DM |
3776 | return NULL; |
3777 | } | |
6afff0ca | 3778 | |
f53c7239 | 3779 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again) |
55a93b3e ED |
3780 | { |
3781 | struct sk_buff *next, *head = NULL, *tail; | |
3782 | ||
bec3cfdc | 3783 | for (; skb != NULL; skb = next) { |
55a93b3e | 3784 | next = skb->next; |
a8305bff | 3785 | skb_mark_not_on_list(skb); |
bec3cfdc ED |
3786 | |
3787 | /* in case skb wont be segmented, point to itself */ | |
3788 | skb->prev = skb; | |
3789 | ||
f53c7239 | 3790 | skb = validate_xmit_skb(skb, dev, again); |
bec3cfdc ED |
3791 | if (!skb) |
3792 | continue; | |
55a93b3e | 3793 | |
bec3cfdc ED |
3794 | if (!head) |
3795 | head = skb; | |
3796 | else | |
3797 | tail->next = skb; | |
3798 | /* If skb was segmented, skb->prev points to | |
3799 | * the last segment. If not, it still contains skb. | |
3800 | */ | |
3801 | tail = skb->prev; | |
55a93b3e ED |
3802 | } |
3803 | return head; | |
f6a78bfc | 3804 | } |
104ba78c | 3805 | EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
f6a78bfc | 3806 | |
1def9238 ED |
3807 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
3808 | { | |
3809 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
3810 | ||
3811 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
3812 | ||
3813 | /* To get more precise estimation of bytes sent on wire, | |
3814 | * we add to pkt_len the headers size of all segments | |
3815 | */ | |
a0dce875 | 3816 | if (shinfo->gso_size && skb_transport_header_was_set(skb)) { |
757b8b1d | 3817 | unsigned int hdr_len; |
15e5a030 | 3818 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 3819 | |
757b8b1d ED |
3820 | /* mac layer + network layer */ |
3821 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
3822 | ||
3823 | /* + transport layer */ | |
7c68d1a6 ED |
3824 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { |
3825 | const struct tcphdr *th; | |
3826 | struct tcphdr _tcphdr; | |
3827 | ||
3828 | th = skb_header_pointer(skb, skb_transport_offset(skb), | |
3829 | sizeof(_tcphdr), &_tcphdr); | |
3830 | if (likely(th)) | |
3831 | hdr_len += __tcp_hdrlen(th); | |
3832 | } else { | |
3833 | struct udphdr _udphdr; | |
3834 | ||
3835 | if (skb_header_pointer(skb, skb_transport_offset(skb), | |
3836 | sizeof(_udphdr), &_udphdr)) | |
3837 | hdr_len += sizeof(struct udphdr); | |
3838 | } | |
15e5a030 JW |
3839 | |
3840 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
3841 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
3842 | shinfo->gso_size); | |
3843 | ||
3844 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
3845 | } |
3846 | } | |
3847 | ||
70713ddd QX |
3848 | static int dev_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *q, |
3849 | struct sk_buff **to_free, | |
3850 | struct netdev_queue *txq) | |
3851 | { | |
3852 | int rc; | |
3853 | ||
3854 | rc = q->enqueue(skb, q, to_free) & NET_XMIT_MASK; | |
3855 | if (rc == NET_XMIT_SUCCESS) | |
3856 | trace_qdisc_enqueue(q, txq, skb); | |
3857 | return rc; | |
3858 | } | |
3859 | ||
bbd8a0d3 KK |
3860 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
3861 | struct net_device *dev, | |
3862 | struct netdev_queue *txq) | |
3863 | { | |
3864 | spinlock_t *root_lock = qdisc_lock(q); | |
520ac30f | 3865 | struct sk_buff *to_free = NULL; |
a2da570d | 3866 | bool contended; |
bbd8a0d3 KK |
3867 | int rc; |
3868 | ||
a2da570d | 3869 | qdisc_calculate_pkt_len(skb, q); |
6b3ba914 JF |
3870 | |
3871 | if (q->flags & TCQ_F_NOLOCK) { | |
c4fef01b YL |
3872 | if (q->flags & TCQ_F_CAN_BYPASS && nolock_qdisc_is_empty(q) && |
3873 | qdisc_run_begin(q)) { | |
3874 | /* Retest nolock_qdisc_is_empty() within the protection | |
3875 | * of q->seqlock to protect from racing with requeuing. | |
3876 | */ | |
3877 | if (unlikely(!nolock_qdisc_is_empty(q))) { | |
70713ddd | 3878 | rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
c4fef01b YL |
3879 | __qdisc_run(q); |
3880 | qdisc_run_end(q); | |
3881 | ||
3882 | goto no_lock_out; | |
3883 | } | |
3884 | ||
3885 | qdisc_bstats_cpu_update(q, skb); | |
3886 | if (sch_direct_xmit(skb, q, dev, txq, NULL, true) && | |
3887 | !nolock_qdisc_is_empty(q)) | |
3888 | __qdisc_run(q); | |
3889 | ||
3890 | qdisc_run_end(q); | |
3891 | return NET_XMIT_SUCCESS; | |
3892 | } | |
3893 | ||
70713ddd | 3894 | rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
c4fef01b | 3895 | qdisc_run(q); |
6b3ba914 | 3896 | |
c4fef01b | 3897 | no_lock_out: |
6b3ba914 JF |
3898 | if (unlikely(to_free)) |
3899 | kfree_skb_list(to_free); | |
3900 | return rc; | |
3901 | } | |
3902 | ||
79640a4c ED |
3903 | /* |
3904 | * Heuristic to force contended enqueues to serialize on a | |
3905 | * separate lock before trying to get qdisc main lock. | |
f9eb8aea | 3906 | * This permits qdisc->running owner to get the lock more |
9bf2b8c2 | 3907 | * often and dequeue packets faster. |
79640a4c | 3908 | */ |
a2da570d | 3909 | contended = qdisc_is_running(q); |
79640a4c ED |
3910 | if (unlikely(contended)) |
3911 | spin_lock(&q->busylock); | |
3912 | ||
bbd8a0d3 KK |
3913 | spin_lock(root_lock); |
3914 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
520ac30f | 3915 | __qdisc_drop(skb, &to_free); |
bbd8a0d3 KK |
3916 | rc = NET_XMIT_DROP; |
3917 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 3918 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
3919 | /* |
3920 | * This is a work-conserving queue; there are no old skbs | |
3921 | * waiting to be sent out; and the qdisc is not running - | |
3922 | * xmit the skb directly. | |
3923 | */ | |
bfe0d029 | 3924 | |
bfe0d029 ED |
3925 | qdisc_bstats_update(q, skb); |
3926 | ||
55a93b3e | 3927 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
3928 | if (unlikely(contended)) { |
3929 | spin_unlock(&q->busylock); | |
3930 | contended = false; | |
3931 | } | |
bbd8a0d3 | 3932 | __qdisc_run(q); |
6c148184 | 3933 | } |
bbd8a0d3 | 3934 | |
6c148184 | 3935 | qdisc_run_end(q); |
bbd8a0d3 KK |
3936 | rc = NET_XMIT_SUCCESS; |
3937 | } else { | |
70713ddd | 3938 | rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
79640a4c ED |
3939 | if (qdisc_run_begin(q)) { |
3940 | if (unlikely(contended)) { | |
3941 | spin_unlock(&q->busylock); | |
3942 | contended = false; | |
3943 | } | |
3944 | __qdisc_run(q); | |
6c148184 | 3945 | qdisc_run_end(q); |
79640a4c | 3946 | } |
bbd8a0d3 KK |
3947 | } |
3948 | spin_unlock(root_lock); | |
520ac30f ED |
3949 | if (unlikely(to_free)) |
3950 | kfree_skb_list(to_free); | |
79640a4c ED |
3951 | if (unlikely(contended)) |
3952 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
3953 | return rc; |
3954 | } | |
3955 | ||
86f8515f | 3956 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
3957 | static void skb_update_prio(struct sk_buff *skb) |
3958 | { | |
4dcb31d4 ED |
3959 | const struct netprio_map *map; |
3960 | const struct sock *sk; | |
3961 | unsigned int prioidx; | |
5bc1421e | 3962 | |
4dcb31d4 ED |
3963 | if (skb->priority) |
3964 | return; | |
3965 | map = rcu_dereference_bh(skb->dev->priomap); | |
3966 | if (!map) | |
3967 | return; | |
3968 | sk = skb_to_full_sk(skb); | |
3969 | if (!sk) | |
3970 | return; | |
91c68ce2 | 3971 | |
4dcb31d4 ED |
3972 | prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data); |
3973 | ||
3974 | if (prioidx < map->priomap_len) | |
3975 | skb->priority = map->priomap[prioidx]; | |
5bc1421e NH |
3976 | } |
3977 | #else | |
3978 | #define skb_update_prio(skb) | |
3979 | #endif | |
3980 | ||
95603e22 MM |
3981 | /** |
3982 | * dev_loopback_xmit - loop back @skb | |
0c4b51f0 EB |
3983 | * @net: network namespace this loopback is happening in |
3984 | * @sk: sk needed to be a netfilter okfn | |
95603e22 MM |
3985 | * @skb: buffer to transmit |
3986 | */ | |
0c4b51f0 | 3987 | int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
3988 | { |
3989 | skb_reset_mac_header(skb); | |
3990 | __skb_pull(skb, skb_network_offset(skb)); | |
3991 | skb->pkt_type = PACKET_LOOPBACK; | |
3992 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
3993 | WARN_ON(!skb_dst(skb)); | |
3994 | skb_dst_force(skb); | |
3995 | netif_rx_ni(skb); | |
3996 | return 0; | |
3997 | } | |
3998 | EXPORT_SYMBOL(dev_loopback_xmit); | |
3999 | ||
1f211a1b DB |
4000 | #ifdef CONFIG_NET_EGRESS |
4001 | static struct sk_buff * | |
4002 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
4003 | { | |
46209401 | 4004 | struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress); |
1f211a1b DB |
4005 | struct tcf_result cl_res; |
4006 | ||
46209401 | 4007 | if (!miniq) |
1f211a1b DB |
4008 | return skb; |
4009 | ||
8dc07fdb | 4010 | /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */ |
aadaca9e | 4011 | qdisc_skb_cb(skb)->mru = 0; |
7baf2429 | 4012 | qdisc_skb_cb(skb)->post_ct = false; |
46209401 | 4013 | mini_qdisc_bstats_cpu_update(miniq, skb); |
1f211a1b | 4014 | |
46209401 | 4015 | switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) { |
1f211a1b DB |
4016 | case TC_ACT_OK: |
4017 | case TC_ACT_RECLASSIFY: | |
4018 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
4019 | break; | |
4020 | case TC_ACT_SHOT: | |
46209401 | 4021 | mini_qdisc_qstats_cpu_drop(miniq); |
1f211a1b | 4022 | *ret = NET_XMIT_DROP; |
7e2c3aea DB |
4023 | kfree_skb(skb); |
4024 | return NULL; | |
1f211a1b DB |
4025 | case TC_ACT_STOLEN: |
4026 | case TC_ACT_QUEUED: | |
e25ea21f | 4027 | case TC_ACT_TRAP: |
1f211a1b | 4028 | *ret = NET_XMIT_SUCCESS; |
7e2c3aea | 4029 | consume_skb(skb); |
1f211a1b DB |
4030 | return NULL; |
4031 | case TC_ACT_REDIRECT: | |
4032 | /* No need to push/pop skb's mac_header here on egress! */ | |
4033 | skb_do_redirect(skb); | |
4034 | *ret = NET_XMIT_SUCCESS; | |
4035 | return NULL; | |
4036 | default: | |
4037 | break; | |
4038 | } | |
357b6cc5 | 4039 | |
1f211a1b DB |
4040 | return skb; |
4041 | } | |
4042 | #endif /* CONFIG_NET_EGRESS */ | |
4043 | ||
fc9bab24 AN |
4044 | #ifdef CONFIG_XPS |
4045 | static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, | |
4046 | struct xps_dev_maps *dev_maps, unsigned int tci) | |
4047 | { | |
255c04a8 | 4048 | int tc = netdev_get_prio_tc_map(dev, skb->priority); |
fc9bab24 AN |
4049 | struct xps_map *map; |
4050 | int queue_index = -1; | |
4051 | ||
5478fcd0 | 4052 | if (tc >= dev_maps->num_tc || tci >= dev_maps->nr_ids) |
255c04a8 AT |
4053 | return queue_index; |
4054 | ||
4055 | tci *= dev_maps->num_tc; | |
4056 | tci += tc; | |
fc9bab24 AN |
4057 | |
4058 | map = rcu_dereference(dev_maps->attr_map[tci]); | |
4059 | if (map) { | |
4060 | if (map->len == 1) | |
4061 | queue_index = map->queues[0]; | |
4062 | else | |
4063 | queue_index = map->queues[reciprocal_scale( | |
4064 | skb_get_hash(skb), map->len)]; | |
4065 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
4066 | queue_index = -1; | |
4067 | } | |
4068 | return queue_index; | |
4069 | } | |
4070 | #endif | |
4071 | ||
eadec877 AD |
4072 | static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev, |
4073 | struct sk_buff *skb) | |
638b2a69 JP |
4074 | { |
4075 | #ifdef CONFIG_XPS | |
4076 | struct xps_dev_maps *dev_maps; | |
fc9bab24 | 4077 | struct sock *sk = skb->sk; |
638b2a69 JP |
4078 | int queue_index = -1; |
4079 | ||
04157469 AN |
4080 | if (!static_key_false(&xps_needed)) |
4081 | return -1; | |
4082 | ||
638b2a69 | 4083 | rcu_read_lock(); |
fc9bab24 AN |
4084 | if (!static_key_false(&xps_rxqs_needed)) |
4085 | goto get_cpus_map; | |
4086 | ||
044ab86d | 4087 | dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_RXQS]); |
638b2a69 | 4088 | if (dev_maps) { |
fc9bab24 | 4089 | int tci = sk_rx_queue_get(sk); |
184c449f | 4090 | |
5478fcd0 | 4091 | if (tci >= 0) |
fc9bab24 AN |
4092 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, |
4093 | tci); | |
4094 | } | |
184c449f | 4095 | |
fc9bab24 AN |
4096 | get_cpus_map: |
4097 | if (queue_index < 0) { | |
044ab86d | 4098 | dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_CPUS]); |
fc9bab24 AN |
4099 | if (dev_maps) { |
4100 | unsigned int tci = skb->sender_cpu - 1; | |
4101 | ||
4102 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
4103 | tci); | |
638b2a69 JP |
4104 | } |
4105 | } | |
4106 | rcu_read_unlock(); | |
4107 | ||
4108 | return queue_index; | |
4109 | #else | |
4110 | return -1; | |
4111 | #endif | |
4112 | } | |
4113 | ||
a4ea8a3d | 4114 | u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, |
a350ecce | 4115 | struct net_device *sb_dev) |
a4ea8a3d AD |
4116 | { |
4117 | return 0; | |
4118 | } | |
4119 | EXPORT_SYMBOL(dev_pick_tx_zero); | |
4120 | ||
4121 | u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, | |
a350ecce | 4122 | struct net_device *sb_dev) |
a4ea8a3d AD |
4123 | { |
4124 | return (u16)raw_smp_processor_id() % dev->real_num_tx_queues; | |
4125 | } | |
4126 | EXPORT_SYMBOL(dev_pick_tx_cpu_id); | |
4127 | ||
b71b5837 PA |
4128 | u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, |
4129 | struct net_device *sb_dev) | |
638b2a69 JP |
4130 | { |
4131 | struct sock *sk = skb->sk; | |
4132 | int queue_index = sk_tx_queue_get(sk); | |
4133 | ||
eadec877 AD |
4134 | sb_dev = sb_dev ? : dev; |
4135 | ||
638b2a69 JP |
4136 | if (queue_index < 0 || skb->ooo_okay || |
4137 | queue_index >= dev->real_num_tx_queues) { | |
eadec877 | 4138 | int new_index = get_xps_queue(dev, sb_dev, skb); |
f4563a75 | 4139 | |
638b2a69 | 4140 | if (new_index < 0) |
eadec877 | 4141 | new_index = skb_tx_hash(dev, sb_dev, skb); |
638b2a69 JP |
4142 | |
4143 | if (queue_index != new_index && sk && | |
004a5d01 | 4144 | sk_fullsock(sk) && |
638b2a69 JP |
4145 | rcu_access_pointer(sk->sk_dst_cache)) |
4146 | sk_tx_queue_set(sk, new_index); | |
4147 | ||
4148 | queue_index = new_index; | |
4149 | } | |
4150 | ||
4151 | return queue_index; | |
4152 | } | |
b71b5837 | 4153 | EXPORT_SYMBOL(netdev_pick_tx); |
638b2a69 | 4154 | |
4bd97d51 PA |
4155 | struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, |
4156 | struct sk_buff *skb, | |
4157 | struct net_device *sb_dev) | |
638b2a69 JP |
4158 | { |
4159 | int queue_index = 0; | |
4160 | ||
4161 | #ifdef CONFIG_XPS | |
52bd2d62 ED |
4162 | u32 sender_cpu = skb->sender_cpu - 1; |
4163 | ||
4164 | if (sender_cpu >= (u32)NR_CPUS) | |
638b2a69 JP |
4165 | skb->sender_cpu = raw_smp_processor_id() + 1; |
4166 | #endif | |
4167 | ||
4168 | if (dev->real_num_tx_queues != 1) { | |
4169 | const struct net_device_ops *ops = dev->netdev_ops; | |
f4563a75 | 4170 | |
638b2a69 | 4171 | if (ops->ndo_select_queue) |
a350ecce | 4172 | queue_index = ops->ndo_select_queue(dev, skb, sb_dev); |
638b2a69 | 4173 | else |
4bd97d51 | 4174 | queue_index = netdev_pick_tx(dev, skb, sb_dev); |
638b2a69 | 4175 | |
d584527c | 4176 | queue_index = netdev_cap_txqueue(dev, queue_index); |
638b2a69 JP |
4177 | } |
4178 | ||
4179 | skb_set_queue_mapping(skb, queue_index); | |
4180 | return netdev_get_tx_queue(dev, queue_index); | |
4181 | } | |
4182 | ||
d29f749e | 4183 | /** |
9d08dd3d | 4184 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 4185 | * @skb: buffer to transmit |
eadec877 | 4186 | * @sb_dev: suboordinate device used for L2 forwarding offload |
d29f749e DJ |
4187 | * |
4188 | * Queue a buffer for transmission to a network device. The caller must | |
4189 | * have set the device and priority and built the buffer before calling | |
4190 | * this function. The function can be called from an interrupt. | |
4191 | * | |
4192 | * A negative errno code is returned on a failure. A success does not | |
4193 | * guarantee the frame will be transmitted as it may be dropped due | |
4194 | * to congestion or traffic shaping. | |
4195 | * | |
4196 | * ----------------------------------------------------------------------------------- | |
4197 | * I notice this method can also return errors from the queue disciplines, | |
4198 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
4199 | * be positive. | |
4200 | * | |
4201 | * Regardless of the return value, the skb is consumed, so it is currently | |
4202 | * difficult to retry a send to this method. (You can bump the ref count | |
4203 | * before sending to hold a reference for retry if you are careful.) | |
4204 | * | |
4205 | * When calling this method, interrupts MUST be enabled. This is because | |
4206 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
4207 | * --BLG | |
4208 | */ | |
eadec877 | 4209 | static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev) |
1da177e4 LT |
4210 | { |
4211 | struct net_device *dev = skb->dev; | |
dc2b4847 | 4212 | struct netdev_queue *txq; |
1da177e4 LT |
4213 | struct Qdisc *q; |
4214 | int rc = -ENOMEM; | |
f53c7239 | 4215 | bool again = false; |
1da177e4 | 4216 | |
6d1ccff6 ED |
4217 | skb_reset_mac_header(skb); |
4218 | ||
e7fd2885 | 4219 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
e7ed11ee | 4220 | __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED); |
e7fd2885 | 4221 | |
4ec93edb YH |
4222 | /* Disable soft irqs for various locks below. Also |
4223 | * stops preemption for RCU. | |
1da177e4 | 4224 | */ |
4ec93edb | 4225 | rcu_read_lock_bh(); |
1da177e4 | 4226 | |
5bc1421e NH |
4227 | skb_update_prio(skb); |
4228 | ||
1f211a1b DB |
4229 | qdisc_pkt_len_init(skb); |
4230 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 4231 | skb->tc_at_ingress = 0; |
357b6cc5 | 4232 | # ifdef CONFIG_NET_EGRESS |
aabf6772 | 4233 | if (static_branch_unlikely(&egress_needed_key)) { |
1f211a1b DB |
4234 | skb = sch_handle_egress(skb, &rc, dev); |
4235 | if (!skb) | |
4236 | goto out; | |
4237 | } | |
357b6cc5 | 4238 | # endif |
1f211a1b | 4239 | #endif |
02875878 ED |
4240 | /* If device/qdisc don't need skb->dst, release it right now while |
4241 | * its hot in this cpu cache. | |
4242 | */ | |
4243 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
4244 | skb_dst_drop(skb); | |
4245 | else | |
4246 | skb_dst_force(skb); | |
4247 | ||
4bd97d51 | 4248 | txq = netdev_core_pick_tx(dev, skb, sb_dev); |
a898def2 | 4249 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 4250 | |
cf66ba58 | 4251 | trace_net_dev_queue(skb); |
1da177e4 | 4252 | if (q->enqueue) { |
bbd8a0d3 | 4253 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 4254 | goto out; |
1da177e4 LT |
4255 | } |
4256 | ||
4257 | /* The device has no queue. Common case for software devices: | |
eb13da1a | 4258 | * loopback, all the sorts of tunnels... |
1da177e4 | 4259 | |
eb13da1a | 4260 | * Really, it is unlikely that netif_tx_lock protection is necessary |
4261 | * here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
4262 | * counters.) | |
4263 | * However, it is possible, that they rely on protection | |
4264 | * made by us here. | |
1da177e4 | 4265 | |
eb13da1a | 4266 | * Check this and shot the lock. It is not prone from deadlocks. |
4267 | *Either shot noqueue qdisc, it is even simpler 8) | |
1da177e4 LT |
4268 | */ |
4269 | if (dev->flags & IFF_UP) { | |
4270 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
4271 | ||
c773e847 | 4272 | if (txq->xmit_lock_owner != cpu) { |
97cdcf37 | 4273 | if (dev_xmit_recursion()) |
745e20f1 ED |
4274 | goto recursion_alert; |
4275 | ||
f53c7239 | 4276 | skb = validate_xmit_skb(skb, dev, &again); |
1f59533f | 4277 | if (!skb) |
d21fd63e | 4278 | goto out; |
1f59533f | 4279 | |
3744741a | 4280 | PRANDOM_ADD_NOISE(skb, dev, txq, jiffies); |
c773e847 | 4281 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 4282 | |
73466498 | 4283 | if (!netif_xmit_stopped(txq)) { |
97cdcf37 | 4284 | dev_xmit_recursion_inc(); |
ce93718f | 4285 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
97cdcf37 | 4286 | dev_xmit_recursion_dec(); |
572a9d7b | 4287 | if (dev_xmit_complete(rc)) { |
c773e847 | 4288 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
4289 | goto out; |
4290 | } | |
4291 | } | |
c773e847 | 4292 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
4293 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
4294 | dev->name); | |
1da177e4 LT |
4295 | } else { |
4296 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
4297 | * unfortunately |
4298 | */ | |
4299 | recursion_alert: | |
e87cc472 JP |
4300 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
4301 | dev->name); | |
1da177e4 LT |
4302 | } |
4303 | } | |
4304 | ||
4305 | rc = -ENETDOWN; | |
d4828d85 | 4306 | rcu_read_unlock_bh(); |
1da177e4 | 4307 | |
015f0688 | 4308 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 4309 | kfree_skb_list(skb); |
1da177e4 LT |
4310 | return rc; |
4311 | out: | |
d4828d85 | 4312 | rcu_read_unlock_bh(); |
1da177e4 LT |
4313 | return rc; |
4314 | } | |
f663dd9a | 4315 | |
2b4aa3ce | 4316 | int dev_queue_xmit(struct sk_buff *skb) |
f663dd9a JW |
4317 | { |
4318 | return __dev_queue_xmit(skb, NULL); | |
4319 | } | |
2b4aa3ce | 4320 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 4321 | |
eadec877 | 4322 | int dev_queue_xmit_accel(struct sk_buff *skb, struct net_device *sb_dev) |
f663dd9a | 4323 | { |
eadec877 | 4324 | return __dev_queue_xmit(skb, sb_dev); |
f663dd9a JW |
4325 | } |
4326 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
4327 | ||
36ccdf85 | 4328 | int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id) |
865b03f2 MK |
4329 | { |
4330 | struct net_device *dev = skb->dev; | |
4331 | struct sk_buff *orig_skb = skb; | |
4332 | struct netdev_queue *txq; | |
4333 | int ret = NETDEV_TX_BUSY; | |
4334 | bool again = false; | |
4335 | ||
4336 | if (unlikely(!netif_running(dev) || | |
4337 | !netif_carrier_ok(dev))) | |
4338 | goto drop; | |
4339 | ||
4340 | skb = validate_xmit_skb_list(skb, dev, &again); | |
4341 | if (skb != orig_skb) | |
4342 | goto drop; | |
4343 | ||
4344 | skb_set_queue_mapping(skb, queue_id); | |
4345 | txq = skb_get_tx_queue(dev, skb); | |
3744741a | 4346 | PRANDOM_ADD_NOISE(skb, dev, txq, jiffies); |
865b03f2 MK |
4347 | |
4348 | local_bh_disable(); | |
4349 | ||
0ad6f6e7 | 4350 | dev_xmit_recursion_inc(); |
865b03f2 MK |
4351 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
4352 | if (!netif_xmit_frozen_or_drv_stopped(txq)) | |
4353 | ret = netdev_start_xmit(skb, dev, txq, false); | |
4354 | HARD_TX_UNLOCK(dev, txq); | |
0ad6f6e7 | 4355 | dev_xmit_recursion_dec(); |
865b03f2 MK |
4356 | |
4357 | local_bh_enable(); | |
865b03f2 MK |
4358 | return ret; |
4359 | drop: | |
4360 | atomic_long_inc(&dev->tx_dropped); | |
4361 | kfree_skb_list(skb); | |
4362 | return NET_XMIT_DROP; | |
4363 | } | |
36ccdf85 | 4364 | EXPORT_SYMBOL(__dev_direct_xmit); |
1da177e4 | 4365 | |
eb13da1a | 4366 | /************************************************************************* |
4367 | * Receiver routines | |
4368 | *************************************************************************/ | |
1da177e4 | 4369 | |
6b2bedc3 | 4370 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
4371 | EXPORT_SYMBOL(netdev_max_backlog); |
4372 | ||
3b098e2d | 4373 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 | 4374 | int netdev_budget __read_mostly = 300; |
a4837980 KK |
4375 | /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */ |
4376 | unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ; | |
3d48b53f MT |
4377 | int weight_p __read_mostly = 64; /* old backlog weight */ |
4378 | int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ | |
4379 | int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ | |
4380 | int dev_rx_weight __read_mostly = 64; | |
4381 | int dev_tx_weight __read_mostly = 64; | |
323ebb61 EC |
4382 | /* Maximum number of GRO_NORMAL skbs to batch up for list-RX */ |
4383 | int gro_normal_batch __read_mostly = 8; | |
1da177e4 | 4384 | |
eecfd7c4 ED |
4385 | /* Called with irq disabled */ |
4386 | static inline void ____napi_schedule(struct softnet_data *sd, | |
4387 | struct napi_struct *napi) | |
4388 | { | |
29863d41 WW |
4389 | struct task_struct *thread; |
4390 | ||
4391 | if (test_bit(NAPI_STATE_THREADED, &napi->state)) { | |
4392 | /* Paired with smp_mb__before_atomic() in | |
5fdd2f0e WW |
4393 | * napi_enable()/dev_set_threaded(). |
4394 | * Use READ_ONCE() to guarantee a complete | |
4395 | * read on napi->thread. Only call | |
29863d41 WW |
4396 | * wake_up_process() when it's not NULL. |
4397 | */ | |
4398 | thread = READ_ONCE(napi->thread); | |
4399 | if (thread) { | |
cb038357 WW |
4400 | /* Avoid doing set_bit() if the thread is in |
4401 | * INTERRUPTIBLE state, cause napi_thread_wait() | |
4402 | * makes sure to proceed with napi polling | |
4403 | * if the thread is explicitly woken from here. | |
4404 | */ | |
2f064a59 | 4405 | if (READ_ONCE(thread->__state) != TASK_INTERRUPTIBLE) |
cb038357 | 4406 | set_bit(NAPI_STATE_SCHED_THREADED, &napi->state); |
29863d41 WW |
4407 | wake_up_process(thread); |
4408 | return; | |
4409 | } | |
4410 | } | |
4411 | ||
eecfd7c4 ED |
4412 | list_add_tail(&napi->poll_list, &sd->poll_list); |
4413 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4414 | } | |
4415 | ||
bfb564e7 KK |
4416 | #ifdef CONFIG_RPS |
4417 | ||
4418 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 4419 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 4420 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
4421 | u32 rps_cpu_mask __read_mostly; |
4422 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 4423 | |
dc05360f | 4424 | struct static_key_false rps_needed __read_mostly; |
3df97ba8 | 4425 | EXPORT_SYMBOL(rps_needed); |
dc05360f | 4426 | struct static_key_false rfs_needed __read_mostly; |
13bfff25 | 4427 | EXPORT_SYMBOL(rfs_needed); |
adc9300e | 4428 | |
c445477d BH |
4429 | static struct rps_dev_flow * |
4430 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
4431 | struct rps_dev_flow *rflow, u16 next_cpu) | |
4432 | { | |
a31196b0 | 4433 | if (next_cpu < nr_cpu_ids) { |
c445477d BH |
4434 | #ifdef CONFIG_RFS_ACCEL |
4435 | struct netdev_rx_queue *rxqueue; | |
4436 | struct rps_dev_flow_table *flow_table; | |
4437 | struct rps_dev_flow *old_rflow; | |
4438 | u32 flow_id; | |
4439 | u16 rxq_index; | |
4440 | int rc; | |
4441 | ||
4442 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
4443 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
4444 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
4445 | goto out; |
4446 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
4447 | if (rxq_index == skb_get_rx_queue(skb)) | |
4448 | goto out; | |
4449 | ||
4450 | rxqueue = dev->_rx + rxq_index; | |
4451 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4452 | if (!flow_table) | |
4453 | goto out; | |
61b905da | 4454 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
4455 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
4456 | rxq_index, flow_id); | |
4457 | if (rc < 0) | |
4458 | goto out; | |
4459 | old_rflow = rflow; | |
4460 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
4461 | rflow->filter = rc; |
4462 | if (old_rflow->filter == rflow->filter) | |
4463 | old_rflow->filter = RPS_NO_FILTER; | |
4464 | out: | |
4465 | #endif | |
4466 | rflow->last_qtail = | |
09994d1b | 4467 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
4468 | } |
4469 | ||
09994d1b | 4470 | rflow->cpu = next_cpu; |
c445477d BH |
4471 | return rflow; |
4472 | } | |
4473 | ||
bfb564e7 KK |
4474 | /* |
4475 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
4476 | * CPU from the RPS map of the receiving queue for a given skb. | |
4477 | * rcu_read_lock must be held on entry. | |
4478 | */ | |
4479 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
4480 | struct rps_dev_flow **rflowp) | |
4481 | { | |
567e4b79 ED |
4482 | const struct rps_sock_flow_table *sock_flow_table; |
4483 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 4484 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 4485 | struct rps_map *map; |
bfb564e7 | 4486 | int cpu = -1; |
567e4b79 | 4487 | u32 tcpu; |
61b905da | 4488 | u32 hash; |
bfb564e7 KK |
4489 | |
4490 | if (skb_rx_queue_recorded(skb)) { | |
4491 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 4492 | |
62fe0b40 BH |
4493 | if (unlikely(index >= dev->real_num_rx_queues)) { |
4494 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4495 | "%s received packet on queue %u, but number " | |
4496 | "of RX queues is %u\n", | |
4497 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
4498 | goto done; |
4499 | } | |
567e4b79 ED |
4500 | rxqueue += index; |
4501 | } | |
bfb564e7 | 4502 | |
567e4b79 ED |
4503 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
4504 | ||
4505 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 4506 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 4507 | if (!flow_table && !map) |
bfb564e7 KK |
4508 | goto done; |
4509 | ||
2d47b459 | 4510 | skb_reset_network_header(skb); |
61b905da TH |
4511 | hash = skb_get_hash(skb); |
4512 | if (!hash) | |
bfb564e7 KK |
4513 | goto done; |
4514 | ||
fec5e652 TH |
4515 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
4516 | if (flow_table && sock_flow_table) { | |
fec5e652 | 4517 | struct rps_dev_flow *rflow; |
567e4b79 ED |
4518 | u32 next_cpu; |
4519 | u32 ident; | |
4520 | ||
4521 | /* First check into global flow table if there is a match */ | |
4522 | ident = sock_flow_table->ents[hash & sock_flow_table->mask]; | |
4523 | if ((ident ^ hash) & ~rps_cpu_mask) | |
4524 | goto try_rps; | |
fec5e652 | 4525 | |
567e4b79 ED |
4526 | next_cpu = ident & rps_cpu_mask; |
4527 | ||
4528 | /* OK, now we know there is a match, | |
4529 | * we can look at the local (per receive queue) flow table | |
4530 | */ | |
61b905da | 4531 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
4532 | tcpu = rflow->cpu; |
4533 | ||
fec5e652 TH |
4534 | /* |
4535 | * If the desired CPU (where last recvmsg was done) is | |
4536 | * different from current CPU (one in the rx-queue flow | |
4537 | * table entry), switch if one of the following holds: | |
a31196b0 | 4538 | * - Current CPU is unset (>= nr_cpu_ids). |
fec5e652 TH |
4539 | * - Current CPU is offline. |
4540 | * - The current CPU's queue tail has advanced beyond the | |
4541 | * last packet that was enqueued using this table entry. | |
4542 | * This guarantees that all previous packets for the flow | |
4543 | * have been dequeued, thus preserving in order delivery. | |
4544 | */ | |
4545 | if (unlikely(tcpu != next_cpu) && | |
a31196b0 | 4546 | (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
fec5e652 | 4547 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
baefa31d TH |
4548 | rflow->last_qtail)) >= 0)) { |
4549 | tcpu = next_cpu; | |
c445477d | 4550 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 4551 | } |
c445477d | 4552 | |
a31196b0 | 4553 | if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
fec5e652 TH |
4554 | *rflowp = rflow; |
4555 | cpu = tcpu; | |
4556 | goto done; | |
4557 | } | |
4558 | } | |
4559 | ||
567e4b79 ED |
4560 | try_rps: |
4561 | ||
0a9627f2 | 4562 | if (map) { |
8fc54f68 | 4563 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
4564 | if (cpu_online(tcpu)) { |
4565 | cpu = tcpu; | |
4566 | goto done; | |
4567 | } | |
4568 | } | |
4569 | ||
4570 | done: | |
0a9627f2 TH |
4571 | return cpu; |
4572 | } | |
4573 | ||
c445477d BH |
4574 | #ifdef CONFIG_RFS_ACCEL |
4575 | ||
4576 | /** | |
4577 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
4578 | * @dev: Device on which the filter was set | |
4579 | * @rxq_index: RX queue index | |
4580 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
4581 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
4582 | * | |
4583 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
4584 | * this function for each installed filter and remove the filters for | |
4585 | * which it returns %true. | |
4586 | */ | |
4587 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
4588 | u32 flow_id, u16 filter_id) | |
4589 | { | |
4590 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
4591 | struct rps_dev_flow_table *flow_table; | |
4592 | struct rps_dev_flow *rflow; | |
4593 | bool expire = true; | |
a31196b0 | 4594 | unsigned int cpu; |
c445477d BH |
4595 | |
4596 | rcu_read_lock(); | |
4597 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4598 | if (flow_table && flow_id <= flow_table->mask) { | |
4599 | rflow = &flow_table->flows[flow_id]; | |
6aa7de05 | 4600 | cpu = READ_ONCE(rflow->cpu); |
a31196b0 | 4601 | if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
c445477d BH |
4602 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
4603 | rflow->last_qtail) < | |
4604 | (int)(10 * flow_table->mask))) | |
4605 | expire = false; | |
4606 | } | |
4607 | rcu_read_unlock(); | |
4608 | return expire; | |
4609 | } | |
4610 | EXPORT_SYMBOL(rps_may_expire_flow); | |
4611 | ||
4612 | #endif /* CONFIG_RFS_ACCEL */ | |
4613 | ||
0a9627f2 | 4614 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 4615 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 4616 | { |
e36fa2f7 ED |
4617 | struct softnet_data *sd = data; |
4618 | ||
eecfd7c4 | 4619 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 4620 | sd->received_rps++; |
0a9627f2 | 4621 | } |
e36fa2f7 | 4622 | |
fec5e652 | 4623 | #endif /* CONFIG_RPS */ |
0a9627f2 | 4624 | |
e36fa2f7 ED |
4625 | /* |
4626 | * Check if this softnet_data structure is another cpu one | |
4627 | * If yes, queue it to our IPI list and return 1 | |
4628 | * If no, return 0 | |
4629 | */ | |
4630 | static int rps_ipi_queued(struct softnet_data *sd) | |
4631 | { | |
4632 | #ifdef CONFIG_RPS | |
903ceff7 | 4633 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
4634 | |
4635 | if (sd != mysd) { | |
4636 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
4637 | mysd->rps_ipi_list = sd; | |
4638 | ||
4639 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4640 | return 1; | |
4641 | } | |
4642 | #endif /* CONFIG_RPS */ | |
4643 | return 0; | |
4644 | } | |
4645 | ||
99bbc707 WB |
4646 | #ifdef CONFIG_NET_FLOW_LIMIT |
4647 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
4648 | #endif | |
4649 | ||
4650 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
4651 | { | |
4652 | #ifdef CONFIG_NET_FLOW_LIMIT | |
4653 | struct sd_flow_limit *fl; | |
4654 | struct softnet_data *sd; | |
4655 | unsigned int old_flow, new_flow; | |
4656 | ||
4657 | if (qlen < (netdev_max_backlog >> 1)) | |
4658 | return false; | |
4659 | ||
903ceff7 | 4660 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
4661 | |
4662 | rcu_read_lock(); | |
4663 | fl = rcu_dereference(sd->flow_limit); | |
4664 | if (fl) { | |
3958afa1 | 4665 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
4666 | old_flow = fl->history[fl->history_head]; |
4667 | fl->history[fl->history_head] = new_flow; | |
4668 | ||
4669 | fl->history_head++; | |
4670 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
4671 | ||
4672 | if (likely(fl->buckets[old_flow])) | |
4673 | fl->buckets[old_flow]--; | |
4674 | ||
4675 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
4676 | fl->count++; | |
4677 | rcu_read_unlock(); | |
4678 | return true; | |
4679 | } | |
4680 | } | |
4681 | rcu_read_unlock(); | |
4682 | #endif | |
4683 | return false; | |
4684 | } | |
4685 | ||
0a9627f2 TH |
4686 | /* |
4687 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
4688 | * queue (may be a remote CPU queue). | |
4689 | */ | |
fec5e652 TH |
4690 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
4691 | unsigned int *qtail) | |
0a9627f2 | 4692 | { |
e36fa2f7 | 4693 | struct softnet_data *sd; |
0a9627f2 | 4694 | unsigned long flags; |
99bbc707 | 4695 | unsigned int qlen; |
0a9627f2 | 4696 | |
e36fa2f7 | 4697 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
4698 | |
4699 | local_irq_save(flags); | |
0a9627f2 | 4700 | |
e36fa2f7 | 4701 | rps_lock(sd); |
e9e4dd32 JA |
4702 | if (!netif_running(skb->dev)) |
4703 | goto drop; | |
99bbc707 WB |
4704 | qlen = skb_queue_len(&sd->input_pkt_queue); |
4705 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
e008f3f0 | 4706 | if (qlen) { |
0a9627f2 | 4707 | enqueue: |
e36fa2f7 | 4708 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 4709 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 4710 | rps_unlock(sd); |
152102c7 | 4711 | local_irq_restore(flags); |
0a9627f2 TH |
4712 | return NET_RX_SUCCESS; |
4713 | } | |
4714 | ||
ebda37c2 ED |
4715 | /* Schedule NAPI for backlog device |
4716 | * We can use non atomic operation since we own the queue lock | |
4717 | */ | |
4718 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 4719 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 4720 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
4721 | } |
4722 | goto enqueue; | |
4723 | } | |
4724 | ||
e9e4dd32 | 4725 | drop: |
dee42870 | 4726 | sd->dropped++; |
e36fa2f7 | 4727 | rps_unlock(sd); |
0a9627f2 | 4728 | |
0a9627f2 TH |
4729 | local_irq_restore(flags); |
4730 | ||
caf586e5 | 4731 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
4732 | kfree_skb(skb); |
4733 | return NET_RX_DROP; | |
4734 | } | |
1da177e4 | 4735 | |
e817f856 JDB |
4736 | static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) |
4737 | { | |
4738 | struct net_device *dev = skb->dev; | |
4739 | struct netdev_rx_queue *rxqueue; | |
4740 | ||
4741 | rxqueue = dev->_rx; | |
4742 | ||
4743 | if (skb_rx_queue_recorded(skb)) { | |
4744 | u16 index = skb_get_rx_queue(skb); | |
4745 | ||
4746 | if (unlikely(index >= dev->real_num_rx_queues)) { | |
4747 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4748 | "%s received packet on queue %u, but number " | |
4749 | "of RX queues is %u\n", | |
4750 | dev->name, index, dev->real_num_rx_queues); | |
4751 | ||
4752 | return rxqueue; /* Return first rxqueue */ | |
4753 | } | |
4754 | rxqueue += index; | |
4755 | } | |
4756 | return rxqueue; | |
4757 | } | |
4758 | ||
fe21cb91 KKD |
4759 | u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, |
4760 | struct bpf_prog *xdp_prog) | |
d4455169 | 4761 | { |
be9df4af | 4762 | void *orig_data, *orig_data_end, *hard_start; |
e817f856 | 4763 | struct netdev_rx_queue *rxqueue; |
22b60343 | 4764 | bool orig_bcast, orig_host; |
43b5169d | 4765 | u32 mac_len, frame_sz; |
29724956 JDB |
4766 | __be16 orig_eth_type; |
4767 | struct ethhdr *eth; | |
fe21cb91 | 4768 | u32 metalen, act; |
be9df4af | 4769 | int off; |
d4455169 | 4770 | |
d4455169 JF |
4771 | /* The XDP program wants to see the packet starting at the MAC |
4772 | * header. | |
4773 | */ | |
4774 | mac_len = skb->data - skb_mac_header(skb); | |
be9df4af | 4775 | hard_start = skb->data - skb_headroom(skb); |
a075767b JDB |
4776 | |
4777 | /* SKB "head" area always have tailroom for skb_shared_info */ | |
be9df4af | 4778 | frame_sz = (void *)skb_end_pointer(skb) - hard_start; |
43b5169d | 4779 | frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
a075767b | 4780 | |
be9df4af LB |
4781 | rxqueue = netif_get_rxqueue(skb); |
4782 | xdp_init_buff(xdp, frame_sz, &rxqueue->xdp_rxq); | |
4783 | xdp_prepare_buff(xdp, hard_start, skb_headroom(skb) - mac_len, | |
4784 | skb_headlen(skb) + mac_len, true); | |
a075767b | 4785 | |
02671e23 BT |
4786 | orig_data_end = xdp->data_end; |
4787 | orig_data = xdp->data; | |
29724956 | 4788 | eth = (struct ethhdr *)xdp->data; |
22b60343 | 4789 | orig_host = ether_addr_equal_64bits(eth->h_dest, skb->dev->dev_addr); |
29724956 JDB |
4790 | orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest); |
4791 | orig_eth_type = eth->h_proto; | |
d4455169 | 4792 | |
02671e23 | 4793 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
d4455169 | 4794 | |
065af355 | 4795 | /* check if bpf_xdp_adjust_head was used */ |
02671e23 | 4796 | off = xdp->data - orig_data; |
065af355 JDB |
4797 | if (off) { |
4798 | if (off > 0) | |
4799 | __skb_pull(skb, off); | |
4800 | else if (off < 0) | |
4801 | __skb_push(skb, -off); | |
4802 | ||
4803 | skb->mac_header += off; | |
4804 | skb_reset_network_header(skb); | |
4805 | } | |
d4455169 | 4806 | |
a075767b JDB |
4807 | /* check if bpf_xdp_adjust_tail was used */ |
4808 | off = xdp->data_end - orig_data_end; | |
f7613120 | 4809 | if (off != 0) { |
02671e23 | 4810 | skb_set_tail_pointer(skb, xdp->data_end - xdp->data); |
a075767b | 4811 | skb->len += off; /* positive on grow, negative on shrink */ |
f7613120 | 4812 | } |
198d83bb | 4813 | |
29724956 JDB |
4814 | /* check if XDP changed eth hdr such SKB needs update */ |
4815 | eth = (struct ethhdr *)xdp->data; | |
4816 | if ((orig_eth_type != eth->h_proto) || | |
22b60343 MW |
4817 | (orig_host != ether_addr_equal_64bits(eth->h_dest, |
4818 | skb->dev->dev_addr)) || | |
29724956 JDB |
4819 | (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) { |
4820 | __skb_push(skb, ETH_HLEN); | |
22b60343 | 4821 | skb->pkt_type = PACKET_HOST; |
29724956 JDB |
4822 | skb->protocol = eth_type_trans(skb, skb->dev); |
4823 | } | |
4824 | ||
fe21cb91 KKD |
4825 | /* Redirect/Tx gives L2 packet, code that will reuse skb must __skb_pull |
4826 | * before calling us again on redirect path. We do not call do_redirect | |
4827 | * as we leave that up to the caller. | |
4828 | * | |
4829 | * Caller is responsible for managing lifetime of skb (i.e. calling | |
4830 | * kfree_skb in response to actions it cannot handle/XDP_DROP). | |
4831 | */ | |
d4455169 | 4832 | switch (act) { |
6103aa96 | 4833 | case XDP_REDIRECT: |
d4455169 JF |
4834 | case XDP_TX: |
4835 | __skb_push(skb, mac_len); | |
de8f3a83 | 4836 | break; |
d4455169 | 4837 | case XDP_PASS: |
02671e23 | 4838 | metalen = xdp->data - xdp->data_meta; |
de8f3a83 DB |
4839 | if (metalen) |
4840 | skb_metadata_set(skb, metalen); | |
d4455169 | 4841 | break; |
fe21cb91 KKD |
4842 | } |
4843 | ||
4844 | return act; | |
4845 | } | |
4846 | ||
4847 | static u32 netif_receive_generic_xdp(struct sk_buff *skb, | |
4848 | struct xdp_buff *xdp, | |
4849 | struct bpf_prog *xdp_prog) | |
4850 | { | |
4851 | u32 act = XDP_DROP; | |
4852 | ||
4853 | /* Reinjected packets coming from act_mirred or similar should | |
4854 | * not get XDP generic processing. | |
4855 | */ | |
4856 | if (skb_is_redirected(skb)) | |
4857 | return XDP_PASS; | |
4858 | ||
4859 | /* XDP packets must be linear and must have sufficient headroom | |
4860 | * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also | |
4861 | * native XDP provides, thus we need to do it here as well. | |
4862 | */ | |
4863 | if (skb_cloned(skb) || skb_is_nonlinear(skb) || | |
4864 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { | |
4865 | int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); | |
4866 | int troom = skb->tail + skb->data_len - skb->end; | |
4867 | ||
4868 | /* In case we have to go down the path and also linearize, | |
4869 | * then lets do the pskb_expand_head() work just once here. | |
4870 | */ | |
4871 | if (pskb_expand_head(skb, | |
4872 | hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, | |
4873 | troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) | |
4874 | goto do_drop; | |
4875 | if (skb_linearize(skb)) | |
4876 | goto do_drop; | |
4877 | } | |
4878 | ||
4879 | act = bpf_prog_run_generic_xdp(skb, xdp, xdp_prog); | |
4880 | switch (act) { | |
4881 | case XDP_REDIRECT: | |
4882 | case XDP_TX: | |
4883 | case XDP_PASS: | |
4884 | break; | |
d4455169 JF |
4885 | default: |
4886 | bpf_warn_invalid_xdp_action(act); | |
df561f66 | 4887 | fallthrough; |
d4455169 JF |
4888 | case XDP_ABORTED: |
4889 | trace_xdp_exception(skb->dev, xdp_prog, act); | |
df561f66 | 4890 | fallthrough; |
d4455169 JF |
4891 | case XDP_DROP: |
4892 | do_drop: | |
4893 | kfree_skb(skb); | |
4894 | break; | |
4895 | } | |
4896 | ||
4897 | return act; | |
4898 | } | |
4899 | ||
4900 | /* When doing generic XDP we have to bypass the qdisc layer and the | |
4901 | * network taps in order to match in-driver-XDP behavior. | |
4902 | */ | |
7c497478 | 4903 | void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) |
d4455169 JF |
4904 | { |
4905 | struct net_device *dev = skb->dev; | |
4906 | struct netdev_queue *txq; | |
4907 | bool free_skb = true; | |
4908 | int cpu, rc; | |
4909 | ||
4bd97d51 | 4910 | txq = netdev_core_pick_tx(dev, skb, NULL); |
d4455169 JF |
4911 | cpu = smp_processor_id(); |
4912 | HARD_TX_LOCK(dev, txq, cpu); | |
4913 | if (!netif_xmit_stopped(txq)) { | |
4914 | rc = netdev_start_xmit(skb, dev, txq, 0); | |
4915 | if (dev_xmit_complete(rc)) | |
4916 | free_skb = false; | |
4917 | } | |
4918 | HARD_TX_UNLOCK(dev, txq); | |
4919 | if (free_skb) { | |
4920 | trace_xdp_exception(dev, xdp_prog, XDP_TX); | |
4921 | kfree_skb(skb); | |
4922 | } | |
4923 | } | |
4924 | ||
02786475 | 4925 | static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key); |
d4455169 | 4926 | |
7c497478 | 4927 | int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb) |
d4455169 | 4928 | { |
d4455169 | 4929 | if (xdp_prog) { |
02671e23 BT |
4930 | struct xdp_buff xdp; |
4931 | u32 act; | |
6103aa96 | 4932 | int err; |
d4455169 | 4933 | |
02671e23 | 4934 | act = netif_receive_generic_xdp(skb, &xdp, xdp_prog); |
d4455169 | 4935 | if (act != XDP_PASS) { |
6103aa96 JF |
4936 | switch (act) { |
4937 | case XDP_REDIRECT: | |
2facaad6 | 4938 | err = xdp_do_generic_redirect(skb->dev, skb, |
02671e23 | 4939 | &xdp, xdp_prog); |
6103aa96 JF |
4940 | if (err) |
4941 | goto out_redir; | |
02671e23 | 4942 | break; |
6103aa96 | 4943 | case XDP_TX: |
d4455169 | 4944 | generic_xdp_tx(skb, xdp_prog); |
6103aa96 JF |
4945 | break; |
4946 | } | |
d4455169 JF |
4947 | return XDP_DROP; |
4948 | } | |
4949 | } | |
4950 | return XDP_PASS; | |
6103aa96 | 4951 | out_redir: |
6103aa96 JF |
4952 | kfree_skb(skb); |
4953 | return XDP_DROP; | |
d4455169 | 4954 | } |
7c497478 | 4955 | EXPORT_SYMBOL_GPL(do_xdp_generic); |
d4455169 | 4956 | |
ae78dbfa | 4957 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 4958 | { |
b0e28f1e | 4959 | int ret; |
1da177e4 | 4960 | |
588f0330 | 4961 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 4962 | |
cf66ba58 | 4963 | trace_netif_rx(skb); |
d4455169 | 4964 | |
df334545 | 4965 | #ifdef CONFIG_RPS |
dc05360f | 4966 | if (static_branch_unlikely(&rps_needed)) { |
fec5e652 | 4967 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
4968 | int cpu; |
4969 | ||
cece1945 | 4970 | preempt_disable(); |
b0e28f1e | 4971 | rcu_read_lock(); |
fec5e652 TH |
4972 | |
4973 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
4974 | if (cpu < 0) |
4975 | cpu = smp_processor_id(); | |
fec5e652 TH |
4976 | |
4977 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
4978 | ||
b0e28f1e | 4979 | rcu_read_unlock(); |
cece1945 | 4980 | preempt_enable(); |
adc9300e ED |
4981 | } else |
4982 | #endif | |
fec5e652 TH |
4983 | { |
4984 | unsigned int qtail; | |
f4563a75 | 4985 | |
fec5e652 TH |
4986 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
4987 | put_cpu(); | |
4988 | } | |
b0e28f1e | 4989 | return ret; |
1da177e4 | 4990 | } |
ae78dbfa BH |
4991 | |
4992 | /** | |
4993 | * netif_rx - post buffer to the network code | |
4994 | * @skb: buffer to post | |
4995 | * | |
4996 | * This function receives a packet from a device driver and queues it for | |
4997 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
4998 | * may be dropped during processing for congestion control or by the | |
4999 | * protocol layers. | |
5000 | * | |
5001 | * return values: | |
5002 | * NET_RX_SUCCESS (no congestion) | |
5003 | * NET_RX_DROP (packet was dropped) | |
5004 | * | |
5005 | */ | |
5006 | ||
5007 | int netif_rx(struct sk_buff *skb) | |
5008 | { | |
b0e3f1bd GB |
5009 | int ret; |
5010 | ||
ae78dbfa BH |
5011 | trace_netif_rx_entry(skb); |
5012 | ||
b0e3f1bd GB |
5013 | ret = netif_rx_internal(skb); |
5014 | trace_netif_rx_exit(ret); | |
5015 | ||
5016 | return ret; | |
ae78dbfa | 5017 | } |
d1b19dff | 5018 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
5019 | |
5020 | int netif_rx_ni(struct sk_buff *skb) | |
5021 | { | |
5022 | int err; | |
5023 | ||
ae78dbfa BH |
5024 | trace_netif_rx_ni_entry(skb); |
5025 | ||
1da177e4 | 5026 | preempt_disable(); |
ae78dbfa | 5027 | err = netif_rx_internal(skb); |
1da177e4 LT |
5028 | if (local_softirq_pending()) |
5029 | do_softirq(); | |
5030 | preempt_enable(); | |
b0e3f1bd | 5031 | trace_netif_rx_ni_exit(err); |
1da177e4 LT |
5032 | |
5033 | return err; | |
5034 | } | |
1da177e4 LT |
5035 | EXPORT_SYMBOL(netif_rx_ni); |
5036 | ||
c11171a4 SAS |
5037 | int netif_rx_any_context(struct sk_buff *skb) |
5038 | { | |
5039 | /* | |
5040 | * If invoked from contexts which do not invoke bottom half | |
5041 | * processing either at return from interrupt or when softrqs are | |
5042 | * reenabled, use netif_rx_ni() which invokes bottomhalf processing | |
5043 | * directly. | |
5044 | */ | |
5045 | if (in_interrupt()) | |
5046 | return netif_rx(skb); | |
5047 | else | |
5048 | return netif_rx_ni(skb); | |
5049 | } | |
5050 | EXPORT_SYMBOL(netif_rx_any_context); | |
5051 | ||
0766f788 | 5052 | static __latent_entropy void net_tx_action(struct softirq_action *h) |
1da177e4 | 5053 | { |
903ceff7 | 5054 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
5055 | |
5056 | if (sd->completion_queue) { | |
5057 | struct sk_buff *clist; | |
5058 | ||
5059 | local_irq_disable(); | |
5060 | clist = sd->completion_queue; | |
5061 | sd->completion_queue = NULL; | |
5062 | local_irq_enable(); | |
5063 | ||
5064 | while (clist) { | |
5065 | struct sk_buff *skb = clist; | |
f4563a75 | 5066 | |
1da177e4 LT |
5067 | clist = clist->next; |
5068 | ||
63354797 | 5069 | WARN_ON(refcount_read(&skb->users)); |
e6247027 ED |
5070 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
5071 | trace_consume_skb(skb); | |
5072 | else | |
5073 | trace_kfree_skb(skb, net_tx_action); | |
15fad714 JDB |
5074 | |
5075 | if (skb->fclone != SKB_FCLONE_UNAVAILABLE) | |
5076 | __kfree_skb(skb); | |
5077 | else | |
5078 | __kfree_skb_defer(skb); | |
1da177e4 LT |
5079 | } |
5080 | } | |
5081 | ||
5082 | if (sd->output_queue) { | |
37437bb2 | 5083 | struct Qdisc *head; |
1da177e4 LT |
5084 | |
5085 | local_irq_disable(); | |
5086 | head = sd->output_queue; | |
5087 | sd->output_queue = NULL; | |
a9cbd588 | 5088 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
5089 | local_irq_enable(); |
5090 | ||
102b55ee YL |
5091 | rcu_read_lock(); |
5092 | ||
1da177e4 | 5093 | while (head) { |
37437bb2 | 5094 | struct Qdisc *q = head; |
6b3ba914 | 5095 | spinlock_t *root_lock = NULL; |
37437bb2 | 5096 | |
1da177e4 LT |
5097 | head = head->next_sched; |
5098 | ||
3bcb846c ED |
5099 | /* We need to make sure head->next_sched is read |
5100 | * before clearing __QDISC_STATE_SCHED | |
5101 | */ | |
5102 | smp_mb__before_atomic(); | |
102b55ee YL |
5103 | |
5104 | if (!(q->flags & TCQ_F_NOLOCK)) { | |
5105 | root_lock = qdisc_lock(q); | |
5106 | spin_lock(root_lock); | |
5107 | } else if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, | |
5108 | &q->state))) { | |
5109 | /* There is a synchronize_net() between | |
5110 | * STATE_DEACTIVATED flag being set and | |
5111 | * qdisc_reset()/some_qdisc_is_busy() in | |
5112 | * dev_deactivate(), so we can safely bail out | |
5113 | * early here to avoid data race between | |
5114 | * qdisc_deactivate() and some_qdisc_is_busy() | |
5115 | * for lockless qdisc. | |
5116 | */ | |
5117 | clear_bit(__QDISC_STATE_SCHED, &q->state); | |
5118 | continue; | |
5119 | } | |
5120 | ||
3bcb846c ED |
5121 | clear_bit(__QDISC_STATE_SCHED, &q->state); |
5122 | qdisc_run(q); | |
6b3ba914 JF |
5123 | if (root_lock) |
5124 | spin_unlock(root_lock); | |
1da177e4 | 5125 | } |
102b55ee YL |
5126 | |
5127 | rcu_read_unlock(); | |
1da177e4 | 5128 | } |
f53c7239 SK |
5129 | |
5130 | xfrm_dev_backlog(sd); | |
1da177e4 LT |
5131 | } |
5132 | ||
181402a5 | 5133 | #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
5134 | /* This hook is defined here for ATM LANE */ |
5135 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
5136 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 5137 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 5138 | #endif |
1da177e4 | 5139 | |
1f211a1b DB |
5140 | static inline struct sk_buff * |
5141 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
9aa1206e | 5142 | struct net_device *orig_dev, bool *another) |
f697c3e8 | 5143 | { |
e7582bab | 5144 | #ifdef CONFIG_NET_CLS_ACT |
46209401 | 5145 | struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress); |
d2788d34 | 5146 | struct tcf_result cl_res; |
24824a09 | 5147 | |
c9e99fd0 DB |
5148 | /* If there's at least one ingress present somewhere (so |
5149 | * we get here via enabled static key), remaining devices | |
5150 | * that are not configured with an ingress qdisc will bail | |
d2788d34 | 5151 | * out here. |
c9e99fd0 | 5152 | */ |
46209401 | 5153 | if (!miniq) |
4577139b | 5154 | return skb; |
46209401 | 5155 | |
f697c3e8 HX |
5156 | if (*pt_prev) { |
5157 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
5158 | *pt_prev = NULL; | |
1da177e4 LT |
5159 | } |
5160 | ||
3365495c | 5161 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
aadaca9e | 5162 | qdisc_skb_cb(skb)->mru = 0; |
7baf2429 | 5163 | qdisc_skb_cb(skb)->post_ct = false; |
8dc07fdb | 5164 | skb->tc_at_ingress = 1; |
46209401 | 5165 | mini_qdisc_bstats_cpu_update(miniq, skb); |
c9e99fd0 | 5166 | |
7d17c544 PB |
5167 | switch (tcf_classify_ingress(skb, miniq->block, miniq->filter_list, |
5168 | &cl_res, false)) { | |
d2788d34 DB |
5169 | case TC_ACT_OK: |
5170 | case TC_ACT_RECLASSIFY: | |
5171 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
5172 | break; | |
5173 | case TC_ACT_SHOT: | |
46209401 | 5174 | mini_qdisc_qstats_cpu_drop(miniq); |
8a3a4c6e ED |
5175 | kfree_skb(skb); |
5176 | return NULL; | |
d2788d34 DB |
5177 | case TC_ACT_STOLEN: |
5178 | case TC_ACT_QUEUED: | |
e25ea21f | 5179 | case TC_ACT_TRAP: |
8a3a4c6e | 5180 | consume_skb(skb); |
d2788d34 | 5181 | return NULL; |
27b29f63 AS |
5182 | case TC_ACT_REDIRECT: |
5183 | /* skb_mac_header check was done by cls/act_bpf, so | |
5184 | * we can safely push the L2 header back before | |
5185 | * redirecting to another netdev | |
5186 | */ | |
5187 | __skb_push(skb, skb->mac_len); | |
9aa1206e DB |
5188 | if (skb_do_redirect(skb) == -EAGAIN) { |
5189 | __skb_pull(skb, skb->mac_len); | |
5190 | *another = true; | |
5191 | break; | |
5192 | } | |
27b29f63 | 5193 | return NULL; |
720f22fe | 5194 | case TC_ACT_CONSUMED: |
cd11b164 | 5195 | return NULL; |
d2788d34 DB |
5196 | default: |
5197 | break; | |
f697c3e8 | 5198 | } |
e7582bab | 5199 | #endif /* CONFIG_NET_CLS_ACT */ |
e687ad60 PN |
5200 | return skb; |
5201 | } | |
1da177e4 | 5202 | |
24b27fc4 MB |
5203 | /** |
5204 | * netdev_is_rx_handler_busy - check if receive handler is registered | |
5205 | * @dev: device to check | |
5206 | * | |
5207 | * Check if a receive handler is already registered for a given device. | |
5208 | * Return true if there one. | |
5209 | * | |
5210 | * The caller must hold the rtnl_mutex. | |
5211 | */ | |
5212 | bool netdev_is_rx_handler_busy(struct net_device *dev) | |
5213 | { | |
5214 | ASSERT_RTNL(); | |
5215 | return dev && rtnl_dereference(dev->rx_handler); | |
5216 | } | |
5217 | EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); | |
5218 | ||
ab95bfe0 JP |
5219 | /** |
5220 | * netdev_rx_handler_register - register receive handler | |
5221 | * @dev: device to register a handler for | |
5222 | * @rx_handler: receive handler to register | |
93e2c32b | 5223 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 5224 | * |
e227867f | 5225 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
5226 | * called from __netif_receive_skb. A negative errno code is returned |
5227 | * on a failure. | |
5228 | * | |
5229 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
5230 | * |
5231 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
5232 | */ |
5233 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
5234 | rx_handler_func_t *rx_handler, |
5235 | void *rx_handler_data) | |
ab95bfe0 | 5236 | { |
1b7cd004 | 5237 | if (netdev_is_rx_handler_busy(dev)) |
ab95bfe0 JP |
5238 | return -EBUSY; |
5239 | ||
f5426250 PA |
5240 | if (dev->priv_flags & IFF_NO_RX_HANDLER) |
5241 | return -EINVAL; | |
5242 | ||
00cfec37 | 5243 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 5244 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
5245 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
5246 | ||
5247 | return 0; | |
5248 | } | |
5249 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
5250 | ||
5251 | /** | |
5252 | * netdev_rx_handler_unregister - unregister receive handler | |
5253 | * @dev: device to unregister a handler from | |
5254 | * | |
166ec369 | 5255 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
5256 | * |
5257 | * The caller must hold the rtnl_mutex. | |
5258 | */ | |
5259 | void netdev_rx_handler_unregister(struct net_device *dev) | |
5260 | { | |
5261 | ||
5262 | ASSERT_RTNL(); | |
a9b3cd7f | 5263 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
5264 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
5265 | * section has a guarantee to see a non NULL rx_handler_data | |
5266 | * as well. | |
5267 | */ | |
5268 | synchronize_net(); | |
a9b3cd7f | 5269 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
5270 | } |
5271 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
5272 | ||
b4b9e355 MG |
5273 | /* |
5274 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
5275 | * the special handling of PFMEMALLOC skbs. | |
5276 | */ | |
5277 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
5278 | { | |
5279 | switch (skb->protocol) { | |
2b8837ae JP |
5280 | case htons(ETH_P_ARP): |
5281 | case htons(ETH_P_IP): | |
5282 | case htons(ETH_P_IPV6): | |
5283 | case htons(ETH_P_8021Q): | |
5284 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
5285 | return true; |
5286 | default: | |
5287 | return false; | |
5288 | } | |
5289 | } | |
5290 | ||
e687ad60 PN |
5291 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
5292 | int *ret, struct net_device *orig_dev) | |
5293 | { | |
5294 | if (nf_hook_ingress_active(skb)) { | |
2c1e2703 AC |
5295 | int ingress_retval; |
5296 | ||
e687ad60 PN |
5297 | if (*pt_prev) { |
5298 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
5299 | *pt_prev = NULL; | |
5300 | } | |
5301 | ||
2c1e2703 AC |
5302 | rcu_read_lock(); |
5303 | ingress_retval = nf_hook_ingress(skb); | |
5304 | rcu_read_unlock(); | |
5305 | return ingress_retval; | |
e687ad60 PN |
5306 | } |
5307 | return 0; | |
5308 | } | |
e687ad60 | 5309 | |
c0bbbdc3 | 5310 | static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, |
88eb1944 | 5311 | struct packet_type **ppt_prev) |
1da177e4 LT |
5312 | { |
5313 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 5314 | rx_handler_func_t *rx_handler; |
c0bbbdc3 | 5315 | struct sk_buff *skb = *pskb; |
f2ccd8fa | 5316 | struct net_device *orig_dev; |
8a4eb573 | 5317 | bool deliver_exact = false; |
1da177e4 | 5318 | int ret = NET_RX_DROP; |
252e3346 | 5319 | __be16 type; |
1da177e4 | 5320 | |
588f0330 | 5321 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 5322 | |
cf66ba58 | 5323 | trace_netif_receive_skb(skb); |
9b22ea56 | 5324 | |
cc9bd5ce | 5325 | orig_dev = skb->dev; |
8f903c70 | 5326 | |
c1d2bbe1 | 5327 | skb_reset_network_header(skb); |
fda55eca ED |
5328 | if (!skb_transport_header_was_set(skb)) |
5329 | skb_reset_transport_header(skb); | |
0b5c9db1 | 5330 | skb_reset_mac_len(skb); |
1da177e4 LT |
5331 | |
5332 | pt_prev = NULL; | |
5333 | ||
63d8ea7f | 5334 | another_round: |
b6858177 | 5335 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
5336 | |
5337 | __this_cpu_inc(softnet_data.processed); | |
5338 | ||
458bf2f2 SH |
5339 | if (static_branch_unlikely(&generic_xdp_needed_key)) { |
5340 | int ret2; | |
5341 | ||
2b4cd14f | 5342 | migrate_disable(); |
458bf2f2 | 5343 | ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); |
2b4cd14f | 5344 | migrate_enable(); |
458bf2f2 | 5345 | |
c0bbbdc3 BS |
5346 | if (ret2 != XDP_PASS) { |
5347 | ret = NET_RX_DROP; | |
5348 | goto out; | |
5349 | } | |
458bf2f2 SH |
5350 | } |
5351 | ||
324cefaf | 5352 | if (eth_type_vlan(skb->protocol)) { |
0d5501c1 | 5353 | skb = skb_vlan_untag(skb); |
bcc6d479 | 5354 | if (unlikely(!skb)) |
2c17d27c | 5355 | goto out; |
bcc6d479 JP |
5356 | } |
5357 | ||
e7246e12 WB |
5358 | if (skb_skip_tc_classify(skb)) |
5359 | goto skip_classify; | |
1da177e4 | 5360 | |
9754e293 | 5361 | if (pfmemalloc) |
b4b9e355 MG |
5362 | goto skip_taps; |
5363 | ||
1da177e4 | 5364 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
5365 | if (pt_prev) |
5366 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5367 | pt_prev = ptype; | |
5368 | } | |
5369 | ||
5370 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
5371 | if (pt_prev) | |
5372 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5373 | pt_prev = ptype; | |
1da177e4 LT |
5374 | } |
5375 | ||
b4b9e355 | 5376 | skip_taps: |
1cf51900 | 5377 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 5378 | if (static_branch_unlikely(&ingress_needed_key)) { |
9aa1206e DB |
5379 | bool another = false; |
5380 | ||
5381 | skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev, | |
5382 | &another); | |
5383 | if (another) | |
5384 | goto another_round; | |
4577139b | 5385 | if (!skb) |
2c17d27c | 5386 | goto out; |
e687ad60 PN |
5387 | |
5388 | if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) | |
2c17d27c | 5389 | goto out; |
4577139b | 5390 | } |
1cf51900 | 5391 | #endif |
2c64605b | 5392 | skb_reset_redirect(skb); |
e7246e12 | 5393 | skip_classify: |
9754e293 | 5394 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
5395 | goto drop; |
5396 | ||
df8a39de | 5397 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
5398 | if (pt_prev) { |
5399 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5400 | pt_prev = NULL; | |
5401 | } | |
48cc32d3 | 5402 | if (vlan_do_receive(&skb)) |
2425717b JF |
5403 | goto another_round; |
5404 | else if (unlikely(!skb)) | |
2c17d27c | 5405 | goto out; |
2425717b JF |
5406 | } |
5407 | ||
48cc32d3 | 5408 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
5409 | if (rx_handler) { |
5410 | if (pt_prev) { | |
5411 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5412 | pt_prev = NULL; | |
5413 | } | |
8a4eb573 JP |
5414 | switch (rx_handler(&skb)) { |
5415 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 5416 | ret = NET_RX_SUCCESS; |
2c17d27c | 5417 | goto out; |
8a4eb573 | 5418 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 5419 | goto another_round; |
8a4eb573 JP |
5420 | case RX_HANDLER_EXACT: |
5421 | deliver_exact = true; | |
b1866bff | 5422 | break; |
8a4eb573 JP |
5423 | case RX_HANDLER_PASS: |
5424 | break; | |
5425 | default: | |
5426 | BUG(); | |
5427 | } | |
ab95bfe0 | 5428 | } |
1da177e4 | 5429 | |
b14a9fc4 | 5430 | if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) { |
36b2f61a GV |
5431 | check_vlan_id: |
5432 | if (skb_vlan_tag_get_id(skb)) { | |
5433 | /* Vlan id is non 0 and vlan_do_receive() above couldn't | |
5434 | * find vlan device. | |
5435 | */ | |
d4b812de | 5436 | skb->pkt_type = PACKET_OTHERHOST; |
324cefaf | 5437 | } else if (eth_type_vlan(skb->protocol)) { |
36b2f61a GV |
5438 | /* Outer header is 802.1P with vlan 0, inner header is |
5439 | * 802.1Q or 802.1AD and vlan_do_receive() above could | |
5440 | * not find vlan dev for vlan id 0. | |
5441 | */ | |
5442 | __vlan_hwaccel_clear_tag(skb); | |
5443 | skb = skb_vlan_untag(skb); | |
5444 | if (unlikely(!skb)) | |
5445 | goto out; | |
5446 | if (vlan_do_receive(&skb)) | |
5447 | /* After stripping off 802.1P header with vlan 0 | |
5448 | * vlan dev is found for inner header. | |
5449 | */ | |
5450 | goto another_round; | |
5451 | else if (unlikely(!skb)) | |
5452 | goto out; | |
5453 | else | |
5454 | /* We have stripped outer 802.1P vlan 0 header. | |
5455 | * But could not find vlan dev. | |
5456 | * check again for vlan id to set OTHERHOST. | |
5457 | */ | |
5458 | goto check_vlan_id; | |
5459 | } | |
d4b812de ED |
5460 | /* Note: we might in the future use prio bits |
5461 | * and set skb->priority like in vlan_do_receive() | |
5462 | * For the time being, just ignore Priority Code Point | |
5463 | */ | |
b1817524 | 5464 | __vlan_hwaccel_clear_tag(skb); |
d4b812de | 5465 | } |
48cc32d3 | 5466 | |
7866a621 SN |
5467 | type = skb->protocol; |
5468 | ||
63d8ea7f | 5469 | /* deliver only exact match when indicated */ |
7866a621 SN |
5470 | if (likely(!deliver_exact)) { |
5471 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
5472 | &ptype_base[ntohs(type) & | |
5473 | PTYPE_HASH_MASK]); | |
5474 | } | |
1f3c8804 | 5475 | |
7866a621 SN |
5476 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
5477 | &orig_dev->ptype_specific); | |
5478 | ||
5479 | if (unlikely(skb->dev != orig_dev)) { | |
5480 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
5481 | &skb->dev->ptype_specific); | |
1da177e4 LT |
5482 | } |
5483 | ||
5484 | if (pt_prev) { | |
1f8b977a | 5485 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
0e698bf6 | 5486 | goto drop; |
88eb1944 | 5487 | *ppt_prev = pt_prev; |
1da177e4 | 5488 | } else { |
b4b9e355 | 5489 | drop: |
6e7333d3 JW |
5490 | if (!deliver_exact) |
5491 | atomic_long_inc(&skb->dev->rx_dropped); | |
5492 | else | |
5493 | atomic_long_inc(&skb->dev->rx_nohandler); | |
1da177e4 LT |
5494 | kfree_skb(skb); |
5495 | /* Jamal, now you will not able to escape explaining | |
5496 | * me how you were going to use this. :-) | |
5497 | */ | |
5498 | ret = NET_RX_DROP; | |
5499 | } | |
5500 | ||
2c17d27c | 5501 | out: |
c0bbbdc3 BS |
5502 | /* The invariant here is that if *ppt_prev is not NULL |
5503 | * then skb should also be non-NULL. | |
5504 | * | |
5505 | * Apparently *ppt_prev assignment above holds this invariant due to | |
5506 | * skb dereferencing near it. | |
5507 | */ | |
5508 | *pskb = skb; | |
9754e293 DM |
5509 | return ret; |
5510 | } | |
5511 | ||
88eb1944 EC |
5512 | static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc) |
5513 | { | |
5514 | struct net_device *orig_dev = skb->dev; | |
5515 | struct packet_type *pt_prev = NULL; | |
5516 | int ret; | |
5517 | ||
c0bbbdc3 | 5518 | ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
88eb1944 | 5519 | if (pt_prev) |
f5737cba PA |
5520 | ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb, |
5521 | skb->dev, pt_prev, orig_dev); | |
88eb1944 EC |
5522 | return ret; |
5523 | } | |
5524 | ||
1c601d82 JDB |
5525 | /** |
5526 | * netif_receive_skb_core - special purpose version of netif_receive_skb | |
5527 | * @skb: buffer to process | |
5528 | * | |
5529 | * More direct receive version of netif_receive_skb(). It should | |
5530 | * only be used by callers that have a need to skip RPS and Generic XDP. | |
2de9780f | 5531 | * Caller must also take care of handling if ``(page_is_)pfmemalloc``. |
1c601d82 JDB |
5532 | * |
5533 | * This function may only be called from softirq context and interrupts | |
5534 | * should be enabled. | |
5535 | * | |
5536 | * Return values (usually ignored): | |
5537 | * NET_RX_SUCCESS: no congestion | |
5538 | * NET_RX_DROP: packet was dropped | |
5539 | */ | |
5540 | int netif_receive_skb_core(struct sk_buff *skb) | |
5541 | { | |
5542 | int ret; | |
5543 | ||
5544 | rcu_read_lock(); | |
88eb1944 | 5545 | ret = __netif_receive_skb_one_core(skb, false); |
1c601d82 JDB |
5546 | rcu_read_unlock(); |
5547 | ||
5548 | return ret; | |
5549 | } | |
5550 | EXPORT_SYMBOL(netif_receive_skb_core); | |
5551 | ||
88eb1944 EC |
5552 | static inline void __netif_receive_skb_list_ptype(struct list_head *head, |
5553 | struct packet_type *pt_prev, | |
5554 | struct net_device *orig_dev) | |
4ce0017a EC |
5555 | { |
5556 | struct sk_buff *skb, *next; | |
5557 | ||
88eb1944 EC |
5558 | if (!pt_prev) |
5559 | return; | |
5560 | if (list_empty(head)) | |
5561 | return; | |
17266ee9 | 5562 | if (pt_prev->list_func != NULL) |
fdf71426 PA |
5563 | INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv, |
5564 | ip_list_rcv, head, pt_prev, orig_dev); | |
17266ee9 | 5565 | else |
9a5a90d1 AL |
5566 | list_for_each_entry_safe(skb, next, head, list) { |
5567 | skb_list_del_init(skb); | |
fdf71426 | 5568 | pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
9a5a90d1 | 5569 | } |
88eb1944 EC |
5570 | } |
5571 | ||
5572 | static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc) | |
5573 | { | |
5574 | /* Fast-path assumptions: | |
5575 | * - There is no RX handler. | |
5576 | * - Only one packet_type matches. | |
5577 | * If either of these fails, we will end up doing some per-packet | |
5578 | * processing in-line, then handling the 'last ptype' for the whole | |
5579 | * sublist. This can't cause out-of-order delivery to any single ptype, | |
5580 | * because the 'last ptype' must be constant across the sublist, and all | |
5581 | * other ptypes are handled per-packet. | |
5582 | */ | |
5583 | /* Current (common) ptype of sublist */ | |
5584 | struct packet_type *pt_curr = NULL; | |
5585 | /* Current (common) orig_dev of sublist */ | |
5586 | struct net_device *od_curr = NULL; | |
5587 | struct list_head sublist; | |
5588 | struct sk_buff *skb, *next; | |
5589 | ||
9af86f93 | 5590 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5591 | list_for_each_entry_safe(skb, next, head, list) { |
5592 | struct net_device *orig_dev = skb->dev; | |
5593 | struct packet_type *pt_prev = NULL; | |
5594 | ||
22f6bbb7 | 5595 | skb_list_del_init(skb); |
c0bbbdc3 | 5596 | __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
9af86f93 EC |
5597 | if (!pt_prev) |
5598 | continue; | |
88eb1944 EC |
5599 | if (pt_curr != pt_prev || od_curr != orig_dev) { |
5600 | /* dispatch old sublist */ | |
88eb1944 EC |
5601 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
5602 | /* start new sublist */ | |
9af86f93 | 5603 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5604 | pt_curr = pt_prev; |
5605 | od_curr = orig_dev; | |
5606 | } | |
9af86f93 | 5607 | list_add_tail(&skb->list, &sublist); |
88eb1944 EC |
5608 | } |
5609 | ||
5610 | /* dispatch final sublist */ | |
9af86f93 | 5611 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
4ce0017a EC |
5612 | } |
5613 | ||
9754e293 DM |
5614 | static int __netif_receive_skb(struct sk_buff *skb) |
5615 | { | |
5616 | int ret; | |
5617 | ||
5618 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
f1083048 | 5619 | unsigned int noreclaim_flag; |
9754e293 DM |
5620 | |
5621 | /* | |
5622 | * PFMEMALLOC skbs are special, they should | |
5623 | * - be delivered to SOCK_MEMALLOC sockets only | |
5624 | * - stay away from userspace | |
5625 | * - have bounded memory usage | |
5626 | * | |
5627 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
5628 | * context down to all allocation sites. | |
5629 | */ | |
f1083048 | 5630 | noreclaim_flag = memalloc_noreclaim_save(); |
88eb1944 | 5631 | ret = __netif_receive_skb_one_core(skb, true); |
f1083048 | 5632 | memalloc_noreclaim_restore(noreclaim_flag); |
9754e293 | 5633 | } else |
88eb1944 | 5634 | ret = __netif_receive_skb_one_core(skb, false); |
9754e293 | 5635 | |
1da177e4 LT |
5636 | return ret; |
5637 | } | |
0a9627f2 | 5638 | |
4ce0017a EC |
5639 | static void __netif_receive_skb_list(struct list_head *head) |
5640 | { | |
5641 | unsigned long noreclaim_flag = 0; | |
5642 | struct sk_buff *skb, *next; | |
5643 | bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */ | |
5644 | ||
5645 | list_for_each_entry_safe(skb, next, head, list) { | |
5646 | if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { | |
5647 | struct list_head sublist; | |
5648 | ||
5649 | /* Handle the previous sublist */ | |
5650 | list_cut_before(&sublist, head, &skb->list); | |
b9f463d6 EC |
5651 | if (!list_empty(&sublist)) |
5652 | __netif_receive_skb_list_core(&sublist, pfmemalloc); | |
4ce0017a EC |
5653 | pfmemalloc = !pfmemalloc; |
5654 | /* See comments in __netif_receive_skb */ | |
5655 | if (pfmemalloc) | |
5656 | noreclaim_flag = memalloc_noreclaim_save(); | |
5657 | else | |
5658 | memalloc_noreclaim_restore(noreclaim_flag); | |
5659 | } | |
5660 | } | |
5661 | /* Handle the remaining sublist */ | |
b9f463d6 EC |
5662 | if (!list_empty(head)) |
5663 | __netif_receive_skb_list_core(head, pfmemalloc); | |
4ce0017a EC |
5664 | /* Restore pflags */ |
5665 | if (pfmemalloc) | |
5666 | memalloc_noreclaim_restore(noreclaim_flag); | |
5667 | } | |
5668 | ||
f4e63525 | 5669 | static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) |
b5cdae32 | 5670 | { |
58038695 | 5671 | struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); |
b5cdae32 DM |
5672 | struct bpf_prog *new = xdp->prog; |
5673 | int ret = 0; | |
5674 | ||
5675 | switch (xdp->command) { | |
58038695 | 5676 | case XDP_SETUP_PROG: |
b5cdae32 DM |
5677 | rcu_assign_pointer(dev->xdp_prog, new); |
5678 | if (old) | |
5679 | bpf_prog_put(old); | |
5680 | ||
5681 | if (old && !new) { | |
02786475 | 5682 | static_branch_dec(&generic_xdp_needed_key); |
b5cdae32 | 5683 | } else if (new && !old) { |
02786475 | 5684 | static_branch_inc(&generic_xdp_needed_key); |
b5cdae32 | 5685 | dev_disable_lro(dev); |
56f5aa77 | 5686 | dev_disable_gro_hw(dev); |
b5cdae32 DM |
5687 | } |
5688 | break; | |
b5cdae32 | 5689 | |
b5cdae32 DM |
5690 | default: |
5691 | ret = -EINVAL; | |
5692 | break; | |
5693 | } | |
5694 | ||
5695 | return ret; | |
5696 | } | |
5697 | ||
ae78dbfa | 5698 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 5699 | { |
2c17d27c JA |
5700 | int ret; |
5701 | ||
588f0330 | 5702 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 5703 | |
c1f19b51 RC |
5704 | if (skb_defer_rx_timestamp(skb)) |
5705 | return NET_RX_SUCCESS; | |
5706 | ||
bbbe211c | 5707 | rcu_read_lock(); |
df334545 | 5708 | #ifdef CONFIG_RPS |
dc05360f | 5709 | if (static_branch_unlikely(&rps_needed)) { |
3b098e2d | 5710 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2c17d27c | 5711 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
0a9627f2 | 5712 | |
3b098e2d ED |
5713 | if (cpu >= 0) { |
5714 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
5715 | rcu_read_unlock(); | |
adc9300e | 5716 | return ret; |
3b098e2d | 5717 | } |
fec5e652 | 5718 | } |
1e94d72f | 5719 | #endif |
2c17d27c JA |
5720 | ret = __netif_receive_skb(skb); |
5721 | rcu_read_unlock(); | |
5722 | return ret; | |
0a9627f2 | 5723 | } |
ae78dbfa | 5724 | |
7da517a3 EC |
5725 | static void netif_receive_skb_list_internal(struct list_head *head) |
5726 | { | |
7da517a3 | 5727 | struct sk_buff *skb, *next; |
8c057efa | 5728 | struct list_head sublist; |
7da517a3 | 5729 | |
8c057efa | 5730 | INIT_LIST_HEAD(&sublist); |
7da517a3 EC |
5731 | list_for_each_entry_safe(skb, next, head, list) { |
5732 | net_timestamp_check(netdev_tstamp_prequeue, skb); | |
22f6bbb7 | 5733 | skb_list_del_init(skb); |
8c057efa EC |
5734 | if (!skb_defer_rx_timestamp(skb)) |
5735 | list_add_tail(&skb->list, &sublist); | |
7da517a3 | 5736 | } |
8c057efa | 5737 | list_splice_init(&sublist, head); |
7da517a3 | 5738 | |
7da517a3 EC |
5739 | rcu_read_lock(); |
5740 | #ifdef CONFIG_RPS | |
dc05360f | 5741 | if (static_branch_unlikely(&rps_needed)) { |
7da517a3 EC |
5742 | list_for_each_entry_safe(skb, next, head, list) { |
5743 | struct rps_dev_flow voidflow, *rflow = &voidflow; | |
5744 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
5745 | ||
5746 | if (cpu >= 0) { | |
8c057efa | 5747 | /* Will be handled, remove from list */ |
22f6bbb7 | 5748 | skb_list_del_init(skb); |
8c057efa | 5749 | enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
7da517a3 EC |
5750 | } |
5751 | } | |
5752 | } | |
5753 | #endif | |
5754 | __netif_receive_skb_list(head); | |
5755 | rcu_read_unlock(); | |
5756 | } | |
5757 | ||
ae78dbfa BH |
5758 | /** |
5759 | * netif_receive_skb - process receive buffer from network | |
5760 | * @skb: buffer to process | |
5761 | * | |
5762 | * netif_receive_skb() is the main receive data processing function. | |
5763 | * It always succeeds. The buffer may be dropped during processing | |
5764 | * for congestion control or by the protocol layers. | |
5765 | * | |
5766 | * This function may only be called from softirq context and interrupts | |
5767 | * should be enabled. | |
5768 | * | |
5769 | * Return values (usually ignored): | |
5770 | * NET_RX_SUCCESS: no congestion | |
5771 | * NET_RX_DROP: packet was dropped | |
5772 | */ | |
04eb4489 | 5773 | int netif_receive_skb(struct sk_buff *skb) |
ae78dbfa | 5774 | { |
b0e3f1bd GB |
5775 | int ret; |
5776 | ||
ae78dbfa BH |
5777 | trace_netif_receive_skb_entry(skb); |
5778 | ||
b0e3f1bd GB |
5779 | ret = netif_receive_skb_internal(skb); |
5780 | trace_netif_receive_skb_exit(ret); | |
5781 | ||
5782 | return ret; | |
ae78dbfa | 5783 | } |
04eb4489 | 5784 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 5785 | |
f6ad8c1b EC |
5786 | /** |
5787 | * netif_receive_skb_list - process many receive buffers from network | |
5788 | * @head: list of skbs to process. | |
5789 | * | |
7da517a3 EC |
5790 | * Since return value of netif_receive_skb() is normally ignored, and |
5791 | * wouldn't be meaningful for a list, this function returns void. | |
f6ad8c1b EC |
5792 | * |
5793 | * This function may only be called from softirq context and interrupts | |
5794 | * should be enabled. | |
5795 | */ | |
5796 | void netif_receive_skb_list(struct list_head *head) | |
5797 | { | |
7da517a3 | 5798 | struct sk_buff *skb; |
f6ad8c1b | 5799 | |
b9f463d6 EC |
5800 | if (list_empty(head)) |
5801 | return; | |
b0e3f1bd GB |
5802 | if (trace_netif_receive_skb_list_entry_enabled()) { |
5803 | list_for_each_entry(skb, head, list) | |
5804 | trace_netif_receive_skb_list_entry(skb); | |
5805 | } | |
7da517a3 | 5806 | netif_receive_skb_list_internal(head); |
b0e3f1bd | 5807 | trace_netif_receive_skb_list_exit(0); |
f6ad8c1b EC |
5808 | } |
5809 | EXPORT_SYMBOL(netif_receive_skb_list); | |
5810 | ||
ce1e2a77 | 5811 | static DEFINE_PER_CPU(struct work_struct, flush_works); |
145dd5f9 PA |
5812 | |
5813 | /* Network device is going away, flush any packets still pending */ | |
5814 | static void flush_backlog(struct work_struct *work) | |
6e583ce5 | 5815 | { |
6e583ce5 | 5816 | struct sk_buff *skb, *tmp; |
145dd5f9 PA |
5817 | struct softnet_data *sd; |
5818 | ||
5819 | local_bh_disable(); | |
5820 | sd = this_cpu_ptr(&softnet_data); | |
6e583ce5 | 5821 | |
145dd5f9 | 5822 | local_irq_disable(); |
e36fa2f7 | 5823 | rps_lock(sd); |
6e7676c1 | 5824 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
41852497 | 5825 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
e36fa2f7 | 5826 | __skb_unlink(skb, &sd->input_pkt_queue); |
7df5cb75 | 5827 | dev_kfree_skb_irq(skb); |
76cc8b13 | 5828 | input_queue_head_incr(sd); |
6e583ce5 | 5829 | } |
6e7676c1 | 5830 | } |
e36fa2f7 | 5831 | rps_unlock(sd); |
145dd5f9 | 5832 | local_irq_enable(); |
6e7676c1 CG |
5833 | |
5834 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
41852497 | 5835 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
6e7676c1 CG |
5836 | __skb_unlink(skb, &sd->process_queue); |
5837 | kfree_skb(skb); | |
76cc8b13 | 5838 | input_queue_head_incr(sd); |
6e7676c1 CG |
5839 | } |
5840 | } | |
145dd5f9 PA |
5841 | local_bh_enable(); |
5842 | } | |
5843 | ||
2de79ee2 PA |
5844 | static bool flush_required(int cpu) |
5845 | { | |
5846 | #if IS_ENABLED(CONFIG_RPS) | |
5847 | struct softnet_data *sd = &per_cpu(softnet_data, cpu); | |
5848 | bool do_flush; | |
5849 | ||
5850 | local_irq_disable(); | |
5851 | rps_lock(sd); | |
5852 | ||
5853 | /* as insertion into process_queue happens with the rps lock held, | |
5854 | * process_queue access may race only with dequeue | |
5855 | */ | |
5856 | do_flush = !skb_queue_empty(&sd->input_pkt_queue) || | |
5857 | !skb_queue_empty_lockless(&sd->process_queue); | |
5858 | rps_unlock(sd); | |
5859 | local_irq_enable(); | |
5860 | ||
5861 | return do_flush; | |
5862 | #endif | |
5863 | /* without RPS we can't safely check input_pkt_queue: during a | |
5864 | * concurrent remote skb_queue_splice() we can detect as empty both | |
5865 | * input_pkt_queue and process_queue even if the latter could end-up | |
5866 | * containing a lot of packets. | |
5867 | */ | |
5868 | return true; | |
5869 | } | |
5870 | ||
41852497 | 5871 | static void flush_all_backlogs(void) |
145dd5f9 | 5872 | { |
2de79ee2 | 5873 | static cpumask_t flush_cpus; |
145dd5f9 PA |
5874 | unsigned int cpu; |
5875 | ||
2de79ee2 PA |
5876 | /* since we are under rtnl lock protection we can use static data |
5877 | * for the cpumask and avoid allocating on stack the possibly | |
5878 | * large mask | |
5879 | */ | |
5880 | ASSERT_RTNL(); | |
5881 | ||
145dd5f9 PA |
5882 | get_online_cpus(); |
5883 | ||
2de79ee2 PA |
5884 | cpumask_clear(&flush_cpus); |
5885 | for_each_online_cpu(cpu) { | |
5886 | if (flush_required(cpu)) { | |
5887 | queue_work_on(cpu, system_highpri_wq, | |
5888 | per_cpu_ptr(&flush_works, cpu)); | |
5889 | cpumask_set_cpu(cpu, &flush_cpus); | |
5890 | } | |
5891 | } | |
145dd5f9 | 5892 | |
2de79ee2 | 5893 | /* we can have in flight packet[s] on the cpus we are not flushing, |
0cbe1e57 | 5894 | * synchronize_net() in unregister_netdevice_many() will take care of |
2de79ee2 PA |
5895 | * them |
5896 | */ | |
5897 | for_each_cpu(cpu, &flush_cpus) | |
41852497 | 5898 | flush_work(per_cpu_ptr(&flush_works, cpu)); |
145dd5f9 PA |
5899 | |
5900 | put_online_cpus(); | |
6e583ce5 SH |
5901 | } |
5902 | ||
c8079432 MM |
5903 | /* Pass the currently batched GRO_NORMAL SKBs up to the stack. */ |
5904 | static void gro_normal_list(struct napi_struct *napi) | |
5905 | { | |
5906 | if (!napi->rx_count) | |
5907 | return; | |
5908 | netif_receive_skb_list_internal(&napi->rx_list); | |
5909 | INIT_LIST_HEAD(&napi->rx_list); | |
5910 | napi->rx_count = 0; | |
5911 | } | |
5912 | ||
5913 | /* Queue one GRO_NORMAL SKB up for list processing. If batch size exceeded, | |
5914 | * pass the whole batch up to the stack. | |
5915 | */ | |
8dc1c444 | 5916 | static void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb, int segs) |
c8079432 MM |
5917 | { |
5918 | list_add_tail(&skb->list, &napi->rx_list); | |
8dc1c444 ED |
5919 | napi->rx_count += segs; |
5920 | if (napi->rx_count >= gro_normal_batch) | |
c8079432 MM |
5921 | gro_normal_list(napi); |
5922 | } | |
5923 | ||
c8079432 | 5924 | static int napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 5925 | { |
22061d80 | 5926 | struct packet_offload *ptype; |
d565b0a1 | 5927 | __be16 type = skb->protocol; |
22061d80 | 5928 | struct list_head *head = &offload_base; |
d565b0a1 HX |
5929 | int err = -ENOENT; |
5930 | ||
c3c7c254 ED |
5931 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
5932 | ||
fc59f9a3 HX |
5933 | if (NAPI_GRO_CB(skb)->count == 1) { |
5934 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 5935 | goto out; |
fc59f9a3 | 5936 | } |
d565b0a1 HX |
5937 | |
5938 | rcu_read_lock(); | |
5939 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5940 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
5941 | continue; |
5942 | ||
aaa5d90b PA |
5943 | err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, |
5944 | ipv6_gro_complete, inet_gro_complete, | |
5945 | skb, 0); | |
d565b0a1 HX |
5946 | break; |
5947 | } | |
5948 | rcu_read_unlock(); | |
5949 | ||
5950 | if (err) { | |
5951 | WARN_ON(&ptype->list == head); | |
5952 | kfree_skb(skb); | |
5953 | return NET_RX_SUCCESS; | |
5954 | } | |
5955 | ||
5956 | out: | |
8dc1c444 | 5957 | gro_normal_one(napi, skb, NAPI_GRO_CB(skb)->count); |
c8079432 | 5958 | return NET_RX_SUCCESS; |
d565b0a1 HX |
5959 | } |
5960 | ||
6312fe77 | 5961 | static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index, |
07d78363 | 5962 | bool flush_old) |
d565b0a1 | 5963 | { |
6312fe77 | 5964 | struct list_head *head = &napi->gro_hash[index].list; |
d4546c25 | 5965 | struct sk_buff *skb, *p; |
2e71a6f8 | 5966 | |
07d78363 | 5967 | list_for_each_entry_safe_reverse(skb, p, head, list) { |
2e71a6f8 ED |
5968 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) |
5969 | return; | |
992cba7e | 5970 | skb_list_del_init(skb); |
c8079432 | 5971 | napi_gro_complete(napi, skb); |
6312fe77 | 5972 | napi->gro_hash[index].count--; |
d565b0a1 | 5973 | } |
d9f37d01 LR |
5974 | |
5975 | if (!napi->gro_hash[index].count) | |
5976 | __clear_bit(index, &napi->gro_bitmask); | |
d565b0a1 | 5977 | } |
07d78363 | 5978 | |
6312fe77 | 5979 | /* napi->gro_hash[].list contains packets ordered by age. |
07d78363 DM |
5980 | * youngest packets at the head of it. |
5981 | * Complete skbs in reverse order to reduce latencies. | |
5982 | */ | |
5983 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
5984 | { | |
42519ede ED |
5985 | unsigned long bitmask = napi->gro_bitmask; |
5986 | unsigned int i, base = ~0U; | |
07d78363 | 5987 | |
42519ede ED |
5988 | while ((i = ffs(bitmask)) != 0) { |
5989 | bitmask >>= i; | |
5990 | base += i; | |
5991 | __napi_gro_flush_chain(napi, base, flush_old); | |
d9f37d01 | 5992 | } |
07d78363 | 5993 | } |
86cac58b | 5994 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 5995 | |
0ccf4d50 AL |
5996 | static void gro_list_prepare(const struct list_head *head, |
5997 | const struct sk_buff *skb) | |
89c5fa33 | 5998 | { |
89c5fa33 | 5999 | unsigned int maclen = skb->dev->hard_header_len; |
0b4cec8c | 6000 | u32 hash = skb_get_hash_raw(skb); |
d4546c25 | 6001 | struct sk_buff *p; |
89c5fa33 | 6002 | |
07d78363 | 6003 | list_for_each_entry(p, head, list) { |
89c5fa33 ED |
6004 | unsigned long diffs; |
6005 | ||
0b4cec8c TH |
6006 | NAPI_GRO_CB(p)->flush = 0; |
6007 | ||
6008 | if (hash != skb_get_hash_raw(p)) { | |
6009 | NAPI_GRO_CB(p)->same_flow = 0; | |
6010 | continue; | |
6011 | } | |
6012 | ||
89c5fa33 | 6013 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
b1817524 MM |
6014 | diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb); |
6015 | if (skb_vlan_tag_present(p)) | |
fc5141cb | 6016 | diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb); |
de8f3a83 | 6017 | diffs |= skb_metadata_differs(p, skb); |
89c5fa33 ED |
6018 | if (maclen == ETH_HLEN) |
6019 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 6020 | skb_mac_header(skb)); |
89c5fa33 ED |
6021 | else if (!diffs) |
6022 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 6023 | skb_mac_header(skb), |
89c5fa33 | 6024 | maclen); |
8550ff8d | 6025 | |
9efb4b5b PA |
6026 | /* in most common scenarions _state is 0 |
6027 | * otherwise we are already on some slower paths | |
6028 | * either skip all the infrequent tests altogether or | |
6029 | * avoid trying too hard to skip each of them individually | |
6030 | */ | |
6031 | if (!diffs && unlikely(skb->slow_gro | p->slow_gro)) { | |
6032 | #if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT) | |
6033 | struct tc_skb_ext *skb_ext; | |
6034 | struct tc_skb_ext *p_ext; | |
6035 | #endif | |
6036 | ||
5e10da53 | 6037 | diffs |= p->sk != skb->sk; |
9efb4b5b PA |
6038 | diffs |= skb_metadata_dst_cmp(p, skb); |
6039 | diffs |= skb_get_nfct(p) ^ skb_get_nfct(skb); | |
6040 | ||
9615fe36 | 6041 | #if IS_ENABLED(CONFIG_SKB_EXTENSIONS) && IS_ENABLED(CONFIG_NET_TC_SKB_EXT) |
9efb4b5b PA |
6042 | skb_ext = skb_ext_find(skb, TC_SKB_EXT); |
6043 | p_ext = skb_ext_find(p, TC_SKB_EXT); | |
8550ff8d PB |
6044 | |
6045 | diffs |= (!!p_ext) ^ (!!skb_ext); | |
6046 | if (!diffs && unlikely(skb_ext)) | |
6047 | diffs |= p_ext->chain ^ skb_ext->chain; | |
9615fe36 | 6048 | #endif |
9efb4b5b | 6049 | } |
8550ff8d | 6050 | |
89c5fa33 | 6051 | NAPI_GRO_CB(p)->same_flow = !diffs; |
89c5fa33 ED |
6052 | } |
6053 | } | |
6054 | ||
7ad18ff6 | 6055 | static inline void skb_gro_reset_offset(struct sk_buff *skb, u32 nhoff) |
299603e8 JC |
6056 | { |
6057 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
6058 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
6059 | ||
6060 | NAPI_GRO_CB(skb)->data_offset = 0; | |
6061 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
6062 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
6063 | ||
8aef998d | 6064 | if (!skb_headlen(skb) && pinfo->nr_frags && |
38ec4944 | 6065 | !PageHighMem(skb_frag_page(frag0)) && |
7ad18ff6 | 6066 | (!NET_IP_ALIGN || !((skb_frag_off(frag0) + nhoff) & 3))) { |
299603e8 | 6067 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); |
7cfd5fd5 ED |
6068 | NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int, |
6069 | skb_frag_size(frag0), | |
6070 | skb->end - skb->tail); | |
89c5fa33 ED |
6071 | } |
6072 | } | |
6073 | ||
a50e233c ED |
6074 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
6075 | { | |
6076 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
6077 | ||
6078 | BUG_ON(skb->end - skb->tail < grow); | |
6079 | ||
6080 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
6081 | ||
6082 | skb->data_len -= grow; | |
6083 | skb->tail += grow; | |
6084 | ||
b54c9d5b | 6085 | skb_frag_off_add(&pinfo->frags[0], grow); |
a50e233c ED |
6086 | skb_frag_size_sub(&pinfo->frags[0], grow); |
6087 | ||
6088 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
6089 | skb_frag_unref(skb, 0); | |
6090 | memmove(pinfo->frags, pinfo->frags + 1, | |
6091 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
6092 | } | |
6093 | } | |
6094 | ||
c8079432 | 6095 | static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head) |
07d78363 | 6096 | { |
6312fe77 | 6097 | struct sk_buff *oldest; |
07d78363 | 6098 | |
6312fe77 | 6099 | oldest = list_last_entry(head, struct sk_buff, list); |
07d78363 | 6100 | |
6312fe77 | 6101 | /* We are called with head length >= MAX_GRO_SKBS, so this is |
07d78363 DM |
6102 | * impossible. |
6103 | */ | |
6104 | if (WARN_ON_ONCE(!oldest)) | |
6105 | return; | |
6106 | ||
d9f37d01 LR |
6107 | /* Do not adjust napi->gro_hash[].count, caller is adding a new |
6108 | * SKB to the chain. | |
07d78363 | 6109 | */ |
ece23711 | 6110 | skb_list_del_init(oldest); |
c8079432 | 6111 | napi_gro_complete(napi, oldest); |
07d78363 DM |
6112 | } |
6113 | ||
bb728820 | 6114 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 6115 | { |
d0eed5c3 AL |
6116 | u32 bucket = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1); |
6117 | struct gro_list *gro_list = &napi->gro_hash[bucket]; | |
d4546c25 | 6118 | struct list_head *head = &offload_base; |
22061d80 | 6119 | struct packet_offload *ptype; |
d565b0a1 | 6120 | __be16 type = skb->protocol; |
d4546c25 | 6121 | struct sk_buff *pp = NULL; |
5b252f0c | 6122 | enum gro_result ret; |
d4546c25 | 6123 | int same_flow; |
a50e233c | 6124 | int grow; |
d565b0a1 | 6125 | |
b5cdae32 | 6126 | if (netif_elide_gro(skb->dev)) |
d565b0a1 HX |
6127 | goto normal; |
6128 | ||
9dc2c313 | 6129 | gro_list_prepare(&gro_list->list, skb); |
89c5fa33 | 6130 | |
d565b0a1 HX |
6131 | rcu_read_lock(); |
6132 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 6133 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
6134 | continue; |
6135 | ||
86911732 | 6136 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 6137 | skb_reset_mac_len(skb); |
d565b0a1 | 6138 | NAPI_GRO_CB(skb)->same_flow = 0; |
d61d072e | 6139 | NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb); |
5d38a079 | 6140 | NAPI_GRO_CB(skb)->free = 0; |
fac8e0f5 | 6141 | NAPI_GRO_CB(skb)->encap_mark = 0; |
fcd91dd4 | 6142 | NAPI_GRO_CB(skb)->recursion_counter = 0; |
a0ca153f | 6143 | NAPI_GRO_CB(skb)->is_fou = 0; |
1530545e | 6144 | NAPI_GRO_CB(skb)->is_atomic = 1; |
15e2396d | 6145 | NAPI_GRO_CB(skb)->gro_remcsum_start = 0; |
d565b0a1 | 6146 | |
662880f4 TH |
6147 | /* Setup for GRO checksum validation */ |
6148 | switch (skb->ip_summed) { | |
6149 | case CHECKSUM_COMPLETE: | |
6150 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
6151 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
6152 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
6153 | break; | |
6154 | case CHECKSUM_UNNECESSARY: | |
6155 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
6156 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
6157 | break; | |
6158 | default: | |
6159 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
6160 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
6161 | } | |
d565b0a1 | 6162 | |
aaa5d90b PA |
6163 | pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive, |
6164 | ipv6_gro_receive, inet_gro_receive, | |
9dc2c313 | 6165 | &gro_list->list, skb); |
d565b0a1 HX |
6166 | break; |
6167 | } | |
6168 | rcu_read_unlock(); | |
6169 | ||
6170 | if (&ptype->list == head) | |
6171 | goto normal; | |
6172 | ||
45586c70 | 6173 | if (PTR_ERR(pp) == -EINPROGRESS) { |
25393d3f SK |
6174 | ret = GRO_CONSUMED; |
6175 | goto ok; | |
6176 | } | |
6177 | ||
0da2afd5 | 6178 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 6179 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 6180 | |
d565b0a1 | 6181 | if (pp) { |
992cba7e | 6182 | skb_list_del_init(pp); |
c8079432 | 6183 | napi_gro_complete(napi, pp); |
9dc2c313 | 6184 | gro_list->count--; |
d565b0a1 HX |
6185 | } |
6186 | ||
0da2afd5 | 6187 | if (same_flow) |
d565b0a1 HX |
6188 | goto ok; |
6189 | ||
600adc18 | 6190 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 6191 | goto normal; |
d565b0a1 | 6192 | |
9dc2c313 AL |
6193 | if (unlikely(gro_list->count >= MAX_GRO_SKBS)) |
6194 | gro_flush_oldest(napi, &gro_list->list); | |
6195 | else | |
6196 | gro_list->count++; | |
6197 | ||
d565b0a1 | 6198 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 6199 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 6200 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 6201 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
9dc2c313 | 6202 | list_add(&skb->list, &gro_list->list); |
5d0d9be8 | 6203 | ret = GRO_HELD; |
d565b0a1 | 6204 | |
ad0f9904 | 6205 | pull: |
a50e233c ED |
6206 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
6207 | if (grow > 0) | |
6208 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 6209 | ok: |
9dc2c313 | 6210 | if (gro_list->count) { |
d0eed5c3 AL |
6211 | if (!test_bit(bucket, &napi->gro_bitmask)) |
6212 | __set_bit(bucket, &napi->gro_bitmask); | |
6213 | } else if (test_bit(bucket, &napi->gro_bitmask)) { | |
6214 | __clear_bit(bucket, &napi->gro_bitmask); | |
d9f37d01 LR |
6215 | } |
6216 | ||
5d0d9be8 | 6217 | return ret; |
d565b0a1 HX |
6218 | |
6219 | normal: | |
ad0f9904 HX |
6220 | ret = GRO_NORMAL; |
6221 | goto pull; | |
5d38a079 | 6222 | } |
96e93eab | 6223 | |
bf5a755f JC |
6224 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
6225 | { | |
6226 | struct list_head *offload_head = &offload_base; | |
6227 | struct packet_offload *ptype; | |
6228 | ||
6229 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
6230 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
6231 | continue; | |
6232 | return ptype; | |
6233 | } | |
6234 | return NULL; | |
6235 | } | |
e27a2f83 | 6236 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
6237 | |
6238 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
6239 | { | |
6240 | struct list_head *offload_head = &offload_base; | |
6241 | struct packet_offload *ptype; | |
6242 | ||
6243 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
6244 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
6245 | continue; | |
6246 | return ptype; | |
6247 | } | |
6248 | return NULL; | |
6249 | } | |
e27a2f83 | 6250 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 6251 | |
6570bc79 AL |
6252 | static gro_result_t napi_skb_finish(struct napi_struct *napi, |
6253 | struct sk_buff *skb, | |
6254 | gro_result_t ret) | |
5d38a079 | 6255 | { |
5d0d9be8 HX |
6256 | switch (ret) { |
6257 | case GRO_NORMAL: | |
8dc1c444 | 6258 | gro_normal_one(napi, skb, 1); |
c7c4b3b6 | 6259 | break; |
5d38a079 | 6260 | |
daa86548 | 6261 | case GRO_MERGED_FREE: |
e44699d2 MK |
6262 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
6263 | napi_skb_free_stolen_head(skb); | |
28b34f01 AT |
6264 | else if (skb->fclone != SKB_FCLONE_UNAVAILABLE) |
6265 | __kfree_skb(skb); | |
e44699d2 | 6266 | else |
9243adfc | 6267 | __kfree_skb_defer(skb); |
daa86548 ED |
6268 | break; |
6269 | ||
5b252f0c BH |
6270 | case GRO_HELD: |
6271 | case GRO_MERGED: | |
25393d3f | 6272 | case GRO_CONSUMED: |
5b252f0c | 6273 | break; |
5d38a079 HX |
6274 | } |
6275 | ||
c7c4b3b6 | 6276 | return ret; |
5d0d9be8 | 6277 | } |
5d0d9be8 | 6278 | |
c7c4b3b6 | 6279 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 6280 | { |
b0e3f1bd GB |
6281 | gro_result_t ret; |
6282 | ||
93f93a44 | 6283 | skb_mark_napi_id(skb, napi); |
ae78dbfa | 6284 | trace_napi_gro_receive_entry(skb); |
86911732 | 6285 | |
7ad18ff6 | 6286 | skb_gro_reset_offset(skb, 0); |
a50e233c | 6287 | |
6570bc79 | 6288 | ret = napi_skb_finish(napi, skb, dev_gro_receive(napi, skb)); |
b0e3f1bd GB |
6289 | trace_napi_gro_receive_exit(ret); |
6290 | ||
6291 | return ret; | |
d565b0a1 HX |
6292 | } |
6293 | EXPORT_SYMBOL(napi_gro_receive); | |
6294 | ||
d0c2b0d2 | 6295 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 6296 | { |
93a35f59 ED |
6297 | if (unlikely(skb->pfmemalloc)) { |
6298 | consume_skb(skb); | |
6299 | return; | |
6300 | } | |
96e93eab | 6301 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
6302 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
6303 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
b1817524 | 6304 | __vlan_hwaccel_clear_tag(skb); |
66c46d74 | 6305 | skb->dev = napi->dev; |
6d152e23 | 6306 | skb->skb_iif = 0; |
33d9a2c7 ED |
6307 | |
6308 | /* eth_type_trans() assumes pkt_type is PACKET_HOST */ | |
6309 | skb->pkt_type = PACKET_HOST; | |
6310 | ||
c3caf119 JC |
6311 | skb->encapsulation = 0; |
6312 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 6313 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
9efb4b5b | 6314 | if (unlikely(skb->slow_gro)) { |
5e10da53 | 6315 | skb_orphan(skb); |
9efb4b5b PA |
6316 | skb_ext_reset(skb); |
6317 | nf_reset_ct(skb); | |
6318 | skb->slow_gro = 0; | |
6319 | } | |
96e93eab HX |
6320 | |
6321 | napi->skb = skb; | |
6322 | } | |
96e93eab | 6323 | |
76620aaf | 6324 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 6325 | { |
5d38a079 | 6326 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
6327 | |
6328 | if (!skb) { | |
fd11a83d | 6329 | skb = napi_alloc_skb(napi, GRO_MAX_HEAD); |
e2f9dc3b ED |
6330 | if (skb) { |
6331 | napi->skb = skb; | |
6332 | skb_mark_napi_id(skb, napi); | |
6333 | } | |
80595d59 | 6334 | } |
96e93eab HX |
6335 | return skb; |
6336 | } | |
76620aaf | 6337 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 6338 | |
a50e233c ED |
6339 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
6340 | struct sk_buff *skb, | |
6341 | gro_result_t ret) | |
96e93eab | 6342 | { |
5d0d9be8 HX |
6343 | switch (ret) { |
6344 | case GRO_NORMAL: | |
a50e233c ED |
6345 | case GRO_HELD: |
6346 | __skb_push(skb, ETH_HLEN); | |
6347 | skb->protocol = eth_type_trans(skb, skb->dev); | |
323ebb61 | 6348 | if (ret == GRO_NORMAL) |
8dc1c444 | 6349 | gro_normal_one(napi, skb, 1); |
86911732 | 6350 | break; |
5d38a079 | 6351 | |
e44699d2 MK |
6352 | case GRO_MERGED_FREE: |
6353 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) | |
6354 | napi_skb_free_stolen_head(skb); | |
6355 | else | |
6356 | napi_reuse_skb(napi, skb); | |
6357 | break; | |
6358 | ||
5b252f0c | 6359 | case GRO_MERGED: |
25393d3f | 6360 | case GRO_CONSUMED: |
5b252f0c | 6361 | break; |
5d0d9be8 | 6362 | } |
5d38a079 | 6363 | |
c7c4b3b6 | 6364 | return ret; |
5d38a079 | 6365 | } |
5d0d9be8 | 6366 | |
a50e233c ED |
6367 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
6368 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
6369 | * We copy ethernet header into skb->data to have a common layout. | |
6370 | */ | |
4adb9c4a | 6371 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
6372 | { |
6373 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
6374 | const struct ethhdr *eth; |
6375 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
6376 | |
6377 | napi->skb = NULL; | |
6378 | ||
a50e233c | 6379 | skb_reset_mac_header(skb); |
7ad18ff6 | 6380 | skb_gro_reset_offset(skb, hlen); |
a50e233c | 6381 | |
a50e233c ED |
6382 | if (unlikely(skb_gro_header_hard(skb, hlen))) { |
6383 | eth = skb_gro_header_slow(skb, hlen, 0); | |
6384 | if (unlikely(!eth)) { | |
4da46ceb AC |
6385 | net_warn_ratelimited("%s: dropping impossible skb from %s\n", |
6386 | __func__, napi->dev->name); | |
a50e233c ED |
6387 | napi_reuse_skb(napi, skb); |
6388 | return NULL; | |
6389 | } | |
6390 | } else { | |
a4270d67 | 6391 | eth = (const struct ethhdr *)skb->data; |
a50e233c ED |
6392 | gro_pull_from_frag0(skb, hlen); |
6393 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
6394 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 6395 | } |
a50e233c ED |
6396 | __skb_pull(skb, hlen); |
6397 | ||
6398 | /* | |
6399 | * This works because the only protocols we care about don't require | |
6400 | * special handling. | |
6401 | * We'll fix it up properly in napi_frags_finish() | |
6402 | */ | |
6403 | skb->protocol = eth->h_proto; | |
76620aaf | 6404 | |
76620aaf HX |
6405 | return skb; |
6406 | } | |
76620aaf | 6407 | |
c7c4b3b6 | 6408 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 6409 | { |
b0e3f1bd | 6410 | gro_result_t ret; |
76620aaf | 6411 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 | 6412 | |
ae78dbfa BH |
6413 | trace_napi_gro_frags_entry(skb); |
6414 | ||
b0e3f1bd GB |
6415 | ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
6416 | trace_napi_gro_frags_exit(ret); | |
6417 | ||
6418 | return ret; | |
5d0d9be8 | 6419 | } |
5d38a079 HX |
6420 | EXPORT_SYMBOL(napi_gro_frags); |
6421 | ||
573e8fca TH |
6422 | /* Compute the checksum from gro_offset and return the folded value |
6423 | * after adding in any pseudo checksum. | |
6424 | */ | |
6425 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
6426 | { | |
6427 | __wsum wsum; | |
6428 | __sum16 sum; | |
6429 | ||
6430 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
6431 | ||
6432 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
6433 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
14641931 | 6434 | /* See comments in __skb_checksum_complete(). */ |
573e8fca TH |
6435 | if (likely(!sum)) { |
6436 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
6437 | !skb->csum_complete_sw) | |
7fe50ac8 | 6438 | netdev_rx_csum_fault(skb->dev, skb); |
573e8fca TH |
6439 | } |
6440 | ||
6441 | NAPI_GRO_CB(skb)->csum = wsum; | |
6442 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
6443 | ||
6444 | return sum; | |
6445 | } | |
6446 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
6447 | ||
773fc8f6 | 6448 | static void net_rps_send_ipi(struct softnet_data *remsd) |
6449 | { | |
6450 | #ifdef CONFIG_RPS | |
6451 | while (remsd) { | |
6452 | struct softnet_data *next = remsd->rps_ipi_next; | |
6453 | ||
6454 | if (cpu_online(remsd->cpu)) | |
6455 | smp_call_function_single_async(remsd->cpu, &remsd->csd); | |
6456 | remsd = next; | |
6457 | } | |
6458 | #endif | |
6459 | } | |
6460 | ||
e326bed2 | 6461 | /* |
855abcf0 | 6462 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
6463 | * Note: called with local irq disabled, but exits with local irq enabled. |
6464 | */ | |
6465 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
6466 | { | |
6467 | #ifdef CONFIG_RPS | |
6468 | struct softnet_data *remsd = sd->rps_ipi_list; | |
6469 | ||
6470 | if (remsd) { | |
6471 | sd->rps_ipi_list = NULL; | |
6472 | ||
6473 | local_irq_enable(); | |
6474 | ||
6475 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
773fc8f6 | 6476 | net_rps_send_ipi(remsd); |
e326bed2 ED |
6477 | } else |
6478 | #endif | |
6479 | local_irq_enable(); | |
6480 | } | |
6481 | ||
d75b1ade ED |
6482 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
6483 | { | |
6484 | #ifdef CONFIG_RPS | |
6485 | return sd->rps_ipi_list != NULL; | |
6486 | #else | |
6487 | return false; | |
6488 | #endif | |
6489 | } | |
6490 | ||
bea3348e | 6491 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 | 6492 | { |
eecfd7c4 | 6493 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
145dd5f9 PA |
6494 | bool again = true; |
6495 | int work = 0; | |
1da177e4 | 6496 | |
e326bed2 ED |
6497 | /* Check if we have pending ipi, its better to send them now, |
6498 | * not waiting net_rx_action() end. | |
6499 | */ | |
d75b1ade | 6500 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
6501 | local_irq_disable(); |
6502 | net_rps_action_and_irq_enable(sd); | |
6503 | } | |
d75b1ade | 6504 | |
3d48b53f | 6505 | napi->weight = dev_rx_weight; |
145dd5f9 | 6506 | while (again) { |
1da177e4 | 6507 | struct sk_buff *skb; |
6e7676c1 CG |
6508 | |
6509 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
2c17d27c | 6510 | rcu_read_lock(); |
6e7676c1 | 6511 | __netif_receive_skb(skb); |
2c17d27c | 6512 | rcu_read_unlock(); |
76cc8b13 | 6513 | input_queue_head_incr(sd); |
145dd5f9 | 6514 | if (++work >= quota) |
76cc8b13 | 6515 | return work; |
145dd5f9 | 6516 | |
6e7676c1 | 6517 | } |
1da177e4 | 6518 | |
145dd5f9 | 6519 | local_irq_disable(); |
e36fa2f7 | 6520 | rps_lock(sd); |
11ef7a89 | 6521 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
6522 | /* |
6523 | * Inline a custom version of __napi_complete(). | |
6524 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
6525 | * and NAPI_STATE_SCHED is the only possible flag set |
6526 | * on backlog. | |
6527 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
6528 | * and we dont need an smp_mb() memory barrier. |
6529 | */ | |
eecfd7c4 | 6530 | napi->state = 0; |
145dd5f9 PA |
6531 | again = false; |
6532 | } else { | |
6533 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
6534 | &sd->process_queue); | |
bea3348e | 6535 | } |
e36fa2f7 | 6536 | rps_unlock(sd); |
145dd5f9 | 6537 | local_irq_enable(); |
6e7676c1 | 6538 | } |
1da177e4 | 6539 | |
bea3348e SH |
6540 | return work; |
6541 | } | |
1da177e4 | 6542 | |
bea3348e SH |
6543 | /** |
6544 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 6545 | * @n: entry to schedule |
bea3348e | 6546 | * |
bc9ad166 ED |
6547 | * The entry's receive function will be scheduled to run. |
6548 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 6549 | */ |
b5606c2d | 6550 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
6551 | { |
6552 | unsigned long flags; | |
1da177e4 | 6553 | |
bea3348e | 6554 | local_irq_save(flags); |
903ceff7 | 6555 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 6556 | local_irq_restore(flags); |
1da177e4 | 6557 | } |
bea3348e SH |
6558 | EXPORT_SYMBOL(__napi_schedule); |
6559 | ||
39e6c820 ED |
6560 | /** |
6561 | * napi_schedule_prep - check if napi can be scheduled | |
6562 | * @n: napi context | |
6563 | * | |
6564 | * Test if NAPI routine is already running, and if not mark | |
ee1a4c84 | 6565 | * it as running. This is used as a condition variable to |
39e6c820 ED |
6566 | * insure only one NAPI poll instance runs. We also make |
6567 | * sure there is no pending NAPI disable. | |
6568 | */ | |
6569 | bool napi_schedule_prep(struct napi_struct *n) | |
6570 | { | |
6571 | unsigned long val, new; | |
6572 | ||
6573 | do { | |
6574 | val = READ_ONCE(n->state); | |
6575 | if (unlikely(val & NAPIF_STATE_DISABLE)) | |
6576 | return false; | |
6577 | new = val | NAPIF_STATE_SCHED; | |
6578 | ||
6579 | /* Sets STATE_MISSED bit if STATE_SCHED was already set | |
6580 | * This was suggested by Alexander Duyck, as compiler | |
6581 | * emits better code than : | |
6582 | * if (val & NAPIF_STATE_SCHED) | |
6583 | * new |= NAPIF_STATE_MISSED; | |
6584 | */ | |
6585 | new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * | |
6586 | NAPIF_STATE_MISSED; | |
6587 | } while (cmpxchg(&n->state, val, new) != val); | |
6588 | ||
6589 | return !(val & NAPIF_STATE_SCHED); | |
6590 | } | |
6591 | EXPORT_SYMBOL(napi_schedule_prep); | |
6592 | ||
bc9ad166 ED |
6593 | /** |
6594 | * __napi_schedule_irqoff - schedule for receive | |
6595 | * @n: entry to schedule | |
6596 | * | |
8380c81d SAS |
6597 | * Variant of __napi_schedule() assuming hard irqs are masked. |
6598 | * | |
6599 | * On PREEMPT_RT enabled kernels this maps to __napi_schedule() | |
6600 | * because the interrupt disabled assumption might not be true | |
6601 | * due to force-threaded interrupts and spinlock substitution. | |
bc9ad166 ED |
6602 | */ |
6603 | void __napi_schedule_irqoff(struct napi_struct *n) | |
6604 | { | |
8380c81d SAS |
6605 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
6606 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
6607 | else | |
6608 | __napi_schedule(n); | |
bc9ad166 ED |
6609 | } |
6610 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
6611 | ||
364b6055 | 6612 | bool napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 | 6613 | { |
6f8b12d6 ED |
6614 | unsigned long flags, val, new, timeout = 0; |
6615 | bool ret = true; | |
d565b0a1 HX |
6616 | |
6617 | /* | |
217f6974 ED |
6618 | * 1) Don't let napi dequeue from the cpu poll list |
6619 | * just in case its running on a different cpu. | |
6620 | * 2) If we are busy polling, do nothing here, we have | |
6621 | * the guarantee we will be called later. | |
d565b0a1 | 6622 | */ |
217f6974 ED |
6623 | if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
6624 | NAPIF_STATE_IN_BUSY_POLL))) | |
364b6055 | 6625 | return false; |
d565b0a1 | 6626 | |
6f8b12d6 ED |
6627 | if (work_done) { |
6628 | if (n->gro_bitmask) | |
7e417a66 ED |
6629 | timeout = READ_ONCE(n->dev->gro_flush_timeout); |
6630 | n->defer_hard_irqs_count = READ_ONCE(n->dev->napi_defer_hard_irqs); | |
6f8b12d6 ED |
6631 | } |
6632 | if (n->defer_hard_irqs_count > 0) { | |
6633 | n->defer_hard_irqs_count--; | |
7e417a66 | 6634 | timeout = READ_ONCE(n->dev->gro_flush_timeout); |
6f8b12d6 ED |
6635 | if (timeout) |
6636 | ret = false; | |
6637 | } | |
6638 | if (n->gro_bitmask) { | |
605108ac PA |
6639 | /* When the NAPI instance uses a timeout and keeps postponing |
6640 | * it, we need to bound somehow the time packets are kept in | |
6641 | * the GRO layer | |
6642 | */ | |
6643 | napi_gro_flush(n, !!timeout); | |
3b47d303 | 6644 | } |
c8079432 MM |
6645 | |
6646 | gro_normal_list(n); | |
6647 | ||
02c1602e | 6648 | if (unlikely(!list_empty(&n->poll_list))) { |
d75b1ade ED |
6649 | /* If n->poll_list is not empty, we need to mask irqs */ |
6650 | local_irq_save(flags); | |
02c1602e | 6651 | list_del_init(&n->poll_list); |
d75b1ade ED |
6652 | local_irq_restore(flags); |
6653 | } | |
39e6c820 ED |
6654 | |
6655 | do { | |
6656 | val = READ_ONCE(n->state); | |
6657 | ||
6658 | WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); | |
6659 | ||
7fd3253a | 6660 | new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED | |
cb038357 | 6661 | NAPIF_STATE_SCHED_THREADED | |
7fd3253a | 6662 | NAPIF_STATE_PREFER_BUSY_POLL); |
39e6c820 ED |
6663 | |
6664 | /* If STATE_MISSED was set, leave STATE_SCHED set, | |
6665 | * because we will call napi->poll() one more time. | |
6666 | * This C code was suggested by Alexander Duyck to help gcc. | |
6667 | */ | |
6668 | new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * | |
6669 | NAPIF_STATE_SCHED; | |
6670 | } while (cmpxchg(&n->state, val, new) != val); | |
6671 | ||
6672 | if (unlikely(val & NAPIF_STATE_MISSED)) { | |
6673 | __napi_schedule(n); | |
6674 | return false; | |
6675 | } | |
6676 | ||
6f8b12d6 ED |
6677 | if (timeout) |
6678 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
6679 | HRTIMER_MODE_REL_PINNED); | |
6680 | return ret; | |
d565b0a1 | 6681 | } |
3b47d303 | 6682 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 6683 | |
af12fa6e | 6684 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
02d62e86 | 6685 | static struct napi_struct *napi_by_id(unsigned int napi_id) |
af12fa6e ET |
6686 | { |
6687 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
6688 | struct napi_struct *napi; | |
6689 | ||
6690 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
6691 | if (napi->napi_id == napi_id) | |
6692 | return napi; | |
6693 | ||
6694 | return NULL; | |
6695 | } | |
02d62e86 ED |
6696 | |
6697 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
217f6974 | 6698 | |
7fd3253a | 6699 | static void __busy_poll_stop(struct napi_struct *napi, bool skip_schedule) |
217f6974 | 6700 | { |
7fd3253a BT |
6701 | if (!skip_schedule) { |
6702 | gro_normal_list(napi); | |
6703 | __napi_schedule(napi); | |
6704 | return; | |
6705 | } | |
217f6974 | 6706 | |
7fd3253a BT |
6707 | if (napi->gro_bitmask) { |
6708 | /* flush too old packets | |
6709 | * If HZ < 1000, flush all packets. | |
6710 | */ | |
6711 | napi_gro_flush(napi, HZ >= 1000); | |
6712 | } | |
217f6974 | 6713 | |
7fd3253a BT |
6714 | gro_normal_list(napi); |
6715 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
6716 | } | |
6717 | ||
7c951caf BT |
6718 | static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock, bool prefer_busy_poll, |
6719 | u16 budget) | |
217f6974 | 6720 | { |
7fd3253a BT |
6721 | bool skip_schedule = false; |
6722 | unsigned long timeout; | |
217f6974 ED |
6723 | int rc; |
6724 | ||
39e6c820 ED |
6725 | /* Busy polling means there is a high chance device driver hard irq |
6726 | * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was | |
6727 | * set in napi_schedule_prep(). | |
6728 | * Since we are about to call napi->poll() once more, we can safely | |
6729 | * clear NAPI_STATE_MISSED. | |
6730 | * | |
6731 | * Note: x86 could use a single "lock and ..." instruction | |
6732 | * to perform these two clear_bit() | |
6733 | */ | |
6734 | clear_bit(NAPI_STATE_MISSED, &napi->state); | |
217f6974 ED |
6735 | clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
6736 | ||
6737 | local_bh_disable(); | |
6738 | ||
7fd3253a BT |
6739 | if (prefer_busy_poll) { |
6740 | napi->defer_hard_irqs_count = READ_ONCE(napi->dev->napi_defer_hard_irqs); | |
6741 | timeout = READ_ONCE(napi->dev->gro_flush_timeout); | |
6742 | if (napi->defer_hard_irqs_count && timeout) { | |
6743 | hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); | |
6744 | skip_schedule = true; | |
6745 | } | |
6746 | } | |
6747 | ||
217f6974 ED |
6748 | /* All we really want here is to re-enable device interrupts. |
6749 | * Ideally, a new ndo_busy_poll_stop() could avoid another round. | |
6750 | */ | |
7c951caf | 6751 | rc = napi->poll(napi, budget); |
323ebb61 EC |
6752 | /* We can't gro_normal_list() here, because napi->poll() might have |
6753 | * rearmed the napi (napi_complete_done()) in which case it could | |
6754 | * already be running on another CPU. | |
6755 | */ | |
7c951caf | 6756 | trace_napi_poll(napi, rc, budget); |
217f6974 | 6757 | netpoll_poll_unlock(have_poll_lock); |
7c951caf | 6758 | if (rc == budget) |
7fd3253a | 6759 | __busy_poll_stop(napi, skip_schedule); |
217f6974 | 6760 | local_bh_enable(); |
217f6974 ED |
6761 | } |
6762 | ||
7db6b048 SS |
6763 | void napi_busy_loop(unsigned int napi_id, |
6764 | bool (*loop_end)(void *, unsigned long), | |
7c951caf | 6765 | void *loop_end_arg, bool prefer_busy_poll, u16 budget) |
02d62e86 | 6766 | { |
7db6b048 | 6767 | unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
217f6974 | 6768 | int (*napi_poll)(struct napi_struct *napi, int budget); |
217f6974 | 6769 | void *have_poll_lock = NULL; |
02d62e86 | 6770 | struct napi_struct *napi; |
217f6974 ED |
6771 | |
6772 | restart: | |
217f6974 | 6773 | napi_poll = NULL; |
02d62e86 | 6774 | |
2a028ecb | 6775 | rcu_read_lock(); |
02d62e86 | 6776 | |
545cd5e5 | 6777 | napi = napi_by_id(napi_id); |
02d62e86 ED |
6778 | if (!napi) |
6779 | goto out; | |
6780 | ||
217f6974 ED |
6781 | preempt_disable(); |
6782 | for (;;) { | |
2b5cd0df AD |
6783 | int work = 0; |
6784 | ||
2a028ecb | 6785 | local_bh_disable(); |
217f6974 ED |
6786 | if (!napi_poll) { |
6787 | unsigned long val = READ_ONCE(napi->state); | |
6788 | ||
6789 | /* If multiple threads are competing for this napi, | |
6790 | * we avoid dirtying napi->state as much as we can. | |
6791 | */ | |
6792 | if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | | |
7fd3253a BT |
6793 | NAPIF_STATE_IN_BUSY_POLL)) { |
6794 | if (prefer_busy_poll) | |
6795 | set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
217f6974 | 6796 | goto count; |
7fd3253a | 6797 | } |
217f6974 ED |
6798 | if (cmpxchg(&napi->state, val, |
6799 | val | NAPIF_STATE_IN_BUSY_POLL | | |
7fd3253a BT |
6800 | NAPIF_STATE_SCHED) != val) { |
6801 | if (prefer_busy_poll) | |
6802 | set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
217f6974 | 6803 | goto count; |
7fd3253a | 6804 | } |
217f6974 ED |
6805 | have_poll_lock = netpoll_poll_lock(napi); |
6806 | napi_poll = napi->poll; | |
6807 | } | |
7c951caf BT |
6808 | work = napi_poll(napi, budget); |
6809 | trace_napi_poll(napi, work, budget); | |
323ebb61 | 6810 | gro_normal_list(napi); |
217f6974 | 6811 | count: |
2b5cd0df | 6812 | if (work > 0) |
7db6b048 | 6813 | __NET_ADD_STATS(dev_net(napi->dev), |
2b5cd0df | 6814 | LINUX_MIB_BUSYPOLLRXPACKETS, work); |
2a028ecb | 6815 | local_bh_enable(); |
02d62e86 | 6816 | |
7db6b048 | 6817 | if (!loop_end || loop_end(loop_end_arg, start_time)) |
217f6974 | 6818 | break; |
02d62e86 | 6819 | |
217f6974 ED |
6820 | if (unlikely(need_resched())) { |
6821 | if (napi_poll) | |
7c951caf | 6822 | busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
217f6974 ED |
6823 | preempt_enable(); |
6824 | rcu_read_unlock(); | |
6825 | cond_resched(); | |
7db6b048 | 6826 | if (loop_end(loop_end_arg, start_time)) |
2b5cd0df | 6827 | return; |
217f6974 ED |
6828 | goto restart; |
6829 | } | |
6cdf89b1 | 6830 | cpu_relax(); |
217f6974 ED |
6831 | } |
6832 | if (napi_poll) | |
7c951caf | 6833 | busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
217f6974 | 6834 | preempt_enable(); |
02d62e86 | 6835 | out: |
2a028ecb | 6836 | rcu_read_unlock(); |
02d62e86 | 6837 | } |
7db6b048 | 6838 | EXPORT_SYMBOL(napi_busy_loop); |
02d62e86 ED |
6839 | |
6840 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
af12fa6e | 6841 | |
149d6ad8 | 6842 | static void napi_hash_add(struct napi_struct *napi) |
af12fa6e | 6843 | { |
4d092dd2 | 6844 | if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state)) |
52bd2d62 | 6845 | return; |
af12fa6e | 6846 | |
52bd2d62 | 6847 | spin_lock(&napi_hash_lock); |
af12fa6e | 6848 | |
545cd5e5 | 6849 | /* 0..NR_CPUS range is reserved for sender_cpu use */ |
52bd2d62 | 6850 | do { |
545cd5e5 AD |
6851 | if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
6852 | napi_gen_id = MIN_NAPI_ID; | |
52bd2d62 ED |
6853 | } while (napi_by_id(napi_gen_id)); |
6854 | napi->napi_id = napi_gen_id; | |
af12fa6e | 6855 | |
52bd2d62 ED |
6856 | hlist_add_head_rcu(&napi->napi_hash_node, |
6857 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
af12fa6e | 6858 | |
52bd2d62 | 6859 | spin_unlock(&napi_hash_lock); |
af12fa6e | 6860 | } |
af12fa6e ET |
6861 | |
6862 | /* Warning : caller is responsible to make sure rcu grace period | |
6863 | * is respected before freeing memory containing @napi | |
6864 | */ | |
5198d545 | 6865 | static void napi_hash_del(struct napi_struct *napi) |
af12fa6e ET |
6866 | { |
6867 | spin_lock(&napi_hash_lock); | |
6868 | ||
4d092dd2 | 6869 | hlist_del_init_rcu(&napi->napi_hash_node); |
5198d545 | 6870 | |
af12fa6e ET |
6871 | spin_unlock(&napi_hash_lock); |
6872 | } | |
af12fa6e | 6873 | |
3b47d303 ED |
6874 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
6875 | { | |
6876 | struct napi_struct *napi; | |
6877 | ||
6878 | napi = container_of(timer, struct napi_struct, timer); | |
39e6c820 ED |
6879 | |
6880 | /* Note : we use a relaxed variant of napi_schedule_prep() not setting | |
6881 | * NAPI_STATE_MISSED, since we do not react to a device IRQ. | |
6882 | */ | |
6f8b12d6 | 6883 | if (!napi_disable_pending(napi) && |
7fd3253a BT |
6884 | !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) { |
6885 | clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
39e6c820 | 6886 | __napi_schedule_irqoff(napi); |
7fd3253a | 6887 | } |
3b47d303 ED |
6888 | |
6889 | return HRTIMER_NORESTART; | |
6890 | } | |
6891 | ||
7c4ec749 | 6892 | static void init_gro_hash(struct napi_struct *napi) |
d565b0a1 | 6893 | { |
07d78363 DM |
6894 | int i; |
6895 | ||
6312fe77 LR |
6896 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6897 | INIT_LIST_HEAD(&napi->gro_hash[i].list); | |
6898 | napi->gro_hash[i].count = 0; | |
6899 | } | |
7c4ec749 DM |
6900 | napi->gro_bitmask = 0; |
6901 | } | |
6902 | ||
5fdd2f0e WW |
6903 | int dev_set_threaded(struct net_device *dev, bool threaded) |
6904 | { | |
6905 | struct napi_struct *napi; | |
6906 | int err = 0; | |
6907 | ||
6908 | if (dev->threaded == threaded) | |
6909 | return 0; | |
6910 | ||
6911 | if (threaded) { | |
6912 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
6913 | if (!napi->thread) { | |
6914 | err = napi_kthread_create(napi); | |
6915 | if (err) { | |
6916 | threaded = false; | |
6917 | break; | |
6918 | } | |
6919 | } | |
6920 | } | |
6921 | } | |
6922 | ||
6923 | dev->threaded = threaded; | |
6924 | ||
6925 | /* Make sure kthread is created before THREADED bit | |
6926 | * is set. | |
6927 | */ | |
6928 | smp_mb__before_atomic(); | |
6929 | ||
6930 | /* Setting/unsetting threaded mode on a napi might not immediately | |
6931 | * take effect, if the current napi instance is actively being | |
6932 | * polled. In this case, the switch between threaded mode and | |
6933 | * softirq mode will happen in the next round of napi_schedule(). | |
6934 | * This should not cause hiccups/stalls to the live traffic. | |
6935 | */ | |
6936 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
6937 | if (threaded) | |
6938 | set_bit(NAPI_STATE_THREADED, &napi->state); | |
6939 | else | |
6940 | clear_bit(NAPI_STATE_THREADED, &napi->state); | |
6941 | } | |
6942 | ||
6943 | return err; | |
6944 | } | |
8f64860f | 6945 | EXPORT_SYMBOL(dev_set_threaded); |
5fdd2f0e | 6946 | |
7c4ec749 DM |
6947 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
6948 | int (*poll)(struct napi_struct *, int), int weight) | |
6949 | { | |
4d092dd2 JK |
6950 | if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state))) |
6951 | return; | |
6952 | ||
7c4ec749 | 6953 | INIT_LIST_HEAD(&napi->poll_list); |
4d092dd2 | 6954 | INIT_HLIST_NODE(&napi->napi_hash_node); |
7c4ec749 DM |
6955 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
6956 | napi->timer.function = napi_watchdog; | |
6957 | init_gro_hash(napi); | |
5d38a079 | 6958 | napi->skb = NULL; |
323ebb61 EC |
6959 | INIT_LIST_HEAD(&napi->rx_list); |
6960 | napi->rx_count = 0; | |
d565b0a1 | 6961 | napi->poll = poll; |
82dc3c63 | 6962 | if (weight > NAPI_POLL_WEIGHT) |
bf29e9e9 QC |
6963 | netdev_err_once(dev, "%s() called with weight %d\n", __func__, |
6964 | weight); | |
d565b0a1 | 6965 | napi->weight = weight; |
d565b0a1 | 6966 | napi->dev = dev; |
5d38a079 | 6967 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
6968 | napi->poll_owner = -1; |
6969 | #endif | |
6970 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
96e97bc0 JK |
6971 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
6972 | list_add_rcu(&napi->dev_list, &dev->napi_list); | |
93d05d4a | 6973 | napi_hash_add(napi); |
29863d41 WW |
6974 | /* Create kthread for this napi if dev->threaded is set. |
6975 | * Clear dev->threaded if kthread creation failed so that | |
6976 | * threaded mode will not be enabled in napi_enable(). | |
6977 | */ | |
6978 | if (dev->threaded && napi_kthread_create(napi)) | |
6979 | dev->threaded = 0; | |
d565b0a1 HX |
6980 | } |
6981 | EXPORT_SYMBOL(netif_napi_add); | |
6982 | ||
3b47d303 ED |
6983 | void napi_disable(struct napi_struct *n) |
6984 | { | |
6985 | might_sleep(); | |
6986 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
6987 | ||
6988 | while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) | |
6989 | msleep(1); | |
2d8bff12 NH |
6990 | while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state)) |
6991 | msleep(1); | |
3b47d303 ED |
6992 | |
6993 | hrtimer_cancel(&n->timer); | |
6994 | ||
7fd3253a | 6995 | clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state); |
3b47d303 | 6996 | clear_bit(NAPI_STATE_DISABLE, &n->state); |
29863d41 | 6997 | clear_bit(NAPI_STATE_THREADED, &n->state); |
3b47d303 ED |
6998 | } |
6999 | EXPORT_SYMBOL(napi_disable); | |
7000 | ||
29863d41 WW |
7001 | /** |
7002 | * napi_enable - enable NAPI scheduling | |
7003 | * @n: NAPI context | |
7004 | * | |
7005 | * Resume NAPI from being scheduled on this context. | |
7006 | * Must be paired with napi_disable. | |
7007 | */ | |
7008 | void napi_enable(struct napi_struct *n) | |
7009 | { | |
7010 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
7011 | smp_mb__before_atomic(); | |
7012 | clear_bit(NAPI_STATE_SCHED, &n->state); | |
7013 | clear_bit(NAPI_STATE_NPSVC, &n->state); | |
7014 | if (n->dev->threaded && n->thread) | |
7015 | set_bit(NAPI_STATE_THREADED, &n->state); | |
7016 | } | |
7017 | EXPORT_SYMBOL(napi_enable); | |
7018 | ||
07d78363 | 7019 | static void flush_gro_hash(struct napi_struct *napi) |
d4546c25 | 7020 | { |
07d78363 | 7021 | int i; |
d4546c25 | 7022 | |
07d78363 DM |
7023 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
7024 | struct sk_buff *skb, *n; | |
7025 | ||
6312fe77 | 7026 | list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list) |
07d78363 | 7027 | kfree_skb(skb); |
6312fe77 | 7028 | napi->gro_hash[i].count = 0; |
07d78363 | 7029 | } |
d4546c25 DM |
7030 | } |
7031 | ||
93d05d4a | 7032 | /* Must be called in process context */ |
5198d545 | 7033 | void __netif_napi_del(struct napi_struct *napi) |
d565b0a1 | 7034 | { |
4d092dd2 JK |
7035 | if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state)) |
7036 | return; | |
7037 | ||
5198d545 | 7038 | napi_hash_del(napi); |
5251ef82 | 7039 | list_del_rcu(&napi->dev_list); |
76620aaf | 7040 | napi_free_frags(napi); |
d565b0a1 | 7041 | |
07d78363 | 7042 | flush_gro_hash(napi); |
d9f37d01 | 7043 | napi->gro_bitmask = 0; |
29863d41 WW |
7044 | |
7045 | if (napi->thread) { | |
7046 | kthread_stop(napi->thread); | |
7047 | napi->thread = NULL; | |
7048 | } | |
d565b0a1 | 7049 | } |
5198d545 | 7050 | EXPORT_SYMBOL(__netif_napi_del); |
d565b0a1 | 7051 | |
898f8015 | 7052 | static int __napi_poll(struct napi_struct *n, bool *repoll) |
726ce70e | 7053 | { |
726ce70e HX |
7054 | int work, weight; |
7055 | ||
726ce70e HX |
7056 | weight = n->weight; |
7057 | ||
7058 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
7059 | * with netpoll's poll_napi(). Only the entity which | |
7060 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
7061 | * actually make the ->poll() call. Therefore we avoid | |
7062 | * accidentally calling ->poll() when NAPI is not scheduled. | |
7063 | */ | |
7064 | work = 0; | |
7065 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { | |
7066 | work = n->poll(n, weight); | |
1db19db7 | 7067 | trace_napi_poll(n, work, weight); |
726ce70e HX |
7068 | } |
7069 | ||
427d5838 ED |
7070 | if (unlikely(work > weight)) |
7071 | pr_err_once("NAPI poll function %pS returned %d, exceeding its budget of %d.\n", | |
7072 | n->poll, work, weight); | |
726ce70e HX |
7073 | |
7074 | if (likely(work < weight)) | |
898f8015 | 7075 | return work; |
726ce70e HX |
7076 | |
7077 | /* Drivers must not modify the NAPI state if they | |
7078 | * consume the entire weight. In such cases this code | |
7079 | * still "owns" the NAPI instance and therefore can | |
7080 | * move the instance around on the list at-will. | |
7081 | */ | |
7082 | if (unlikely(napi_disable_pending(n))) { | |
7083 | napi_complete(n); | |
898f8015 | 7084 | return work; |
726ce70e HX |
7085 | } |
7086 | ||
7fd3253a BT |
7087 | /* The NAPI context has more processing work, but busy-polling |
7088 | * is preferred. Exit early. | |
7089 | */ | |
7090 | if (napi_prefer_busy_poll(n)) { | |
7091 | if (napi_complete_done(n, work)) { | |
7092 | /* If timeout is not set, we need to make sure | |
7093 | * that the NAPI is re-scheduled. | |
7094 | */ | |
7095 | napi_schedule(n); | |
7096 | } | |
898f8015 | 7097 | return work; |
7fd3253a BT |
7098 | } |
7099 | ||
d9f37d01 | 7100 | if (n->gro_bitmask) { |
726ce70e HX |
7101 | /* flush too old packets |
7102 | * If HZ < 1000, flush all packets. | |
7103 | */ | |
7104 | napi_gro_flush(n, HZ >= 1000); | |
7105 | } | |
7106 | ||
c8079432 MM |
7107 | gro_normal_list(n); |
7108 | ||
001ce546 HX |
7109 | /* Some drivers may have called napi_schedule |
7110 | * prior to exhausting their budget. | |
7111 | */ | |
7112 | if (unlikely(!list_empty(&n->poll_list))) { | |
7113 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
7114 | n->dev ? n->dev->name : "backlog"); | |
898f8015 | 7115 | return work; |
001ce546 HX |
7116 | } |
7117 | ||
898f8015 FF |
7118 | *repoll = true; |
7119 | ||
7120 | return work; | |
7121 | } | |
7122 | ||
7123 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) | |
7124 | { | |
7125 | bool do_repoll = false; | |
7126 | void *have; | |
7127 | int work; | |
7128 | ||
7129 | list_del_init(&n->poll_list); | |
7130 | ||
7131 | have = netpoll_poll_lock(n); | |
7132 | ||
7133 | work = __napi_poll(n, &do_repoll); | |
7134 | ||
7135 | if (do_repoll) | |
7136 | list_add_tail(&n->poll_list, repoll); | |
726ce70e | 7137 | |
726ce70e HX |
7138 | netpoll_poll_unlock(have); |
7139 | ||
7140 | return work; | |
7141 | } | |
7142 | ||
29863d41 WW |
7143 | static int napi_thread_wait(struct napi_struct *napi) |
7144 | { | |
cb038357 WW |
7145 | bool woken = false; |
7146 | ||
29863d41 WW |
7147 | set_current_state(TASK_INTERRUPTIBLE); |
7148 | ||
27f0ad71 | 7149 | while (!kthread_should_stop()) { |
cb038357 WW |
7150 | /* Testing SCHED_THREADED bit here to make sure the current |
7151 | * kthread owns this napi and could poll on this napi. | |
7152 | * Testing SCHED bit is not enough because SCHED bit might be | |
7153 | * set by some other busy poll thread or by napi_disable(). | |
7154 | */ | |
7155 | if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state) || woken) { | |
29863d41 WW |
7156 | WARN_ON(!list_empty(&napi->poll_list)); |
7157 | __set_current_state(TASK_RUNNING); | |
7158 | return 0; | |
7159 | } | |
7160 | ||
7161 | schedule(); | |
cb038357 WW |
7162 | /* woken being true indicates this thread owns this napi. */ |
7163 | woken = true; | |
29863d41 WW |
7164 | set_current_state(TASK_INTERRUPTIBLE); |
7165 | } | |
7166 | __set_current_state(TASK_RUNNING); | |
27f0ad71 | 7167 | |
29863d41 WW |
7168 | return -1; |
7169 | } | |
7170 | ||
7171 | static int napi_threaded_poll(void *data) | |
7172 | { | |
7173 | struct napi_struct *napi = data; | |
7174 | void *have; | |
7175 | ||
7176 | while (!napi_thread_wait(napi)) { | |
7177 | for (;;) { | |
7178 | bool repoll = false; | |
7179 | ||
7180 | local_bh_disable(); | |
7181 | ||
7182 | have = netpoll_poll_lock(napi); | |
7183 | __napi_poll(napi, &repoll); | |
7184 | netpoll_poll_unlock(have); | |
7185 | ||
29863d41 WW |
7186 | local_bh_enable(); |
7187 | ||
7188 | if (!repoll) | |
7189 | break; | |
7190 | ||
7191 | cond_resched(); | |
7192 | } | |
7193 | } | |
7194 | return 0; | |
7195 | } | |
7196 | ||
0766f788 | 7197 | static __latent_entropy void net_rx_action(struct softirq_action *h) |
1da177e4 | 7198 | { |
903ceff7 | 7199 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
7acf8a1e MW |
7200 | unsigned long time_limit = jiffies + |
7201 | usecs_to_jiffies(netdev_budget_usecs); | |
51b0bded | 7202 | int budget = netdev_budget; |
d75b1ade ED |
7203 | LIST_HEAD(list); |
7204 | LIST_HEAD(repoll); | |
53fb95d3 | 7205 | |
1da177e4 | 7206 | local_irq_disable(); |
d75b1ade ED |
7207 | list_splice_init(&sd->poll_list, &list); |
7208 | local_irq_enable(); | |
1da177e4 | 7209 | |
ceb8d5bf | 7210 | for (;;) { |
bea3348e | 7211 | struct napi_struct *n; |
1da177e4 | 7212 | |
ceb8d5bf HX |
7213 | if (list_empty(&list)) { |
7214 | if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) | |
fec6e49b | 7215 | return; |
ceb8d5bf HX |
7216 | break; |
7217 | } | |
7218 | ||
6bd373eb HX |
7219 | n = list_first_entry(&list, struct napi_struct, poll_list); |
7220 | budget -= napi_poll(n, &repoll); | |
7221 | ||
d75b1ade | 7222 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
7223 | * Allow this to run for 2 jiffies since which will allow |
7224 | * an average latency of 1.5/HZ. | |
bea3348e | 7225 | */ |
ceb8d5bf HX |
7226 | if (unlikely(budget <= 0 || |
7227 | time_after_eq(jiffies, time_limit))) { | |
7228 | sd->time_squeeze++; | |
7229 | break; | |
7230 | } | |
1da177e4 | 7231 | } |
d75b1ade | 7232 | |
d75b1ade ED |
7233 | local_irq_disable(); |
7234 | ||
7235 | list_splice_tail_init(&sd->poll_list, &list); | |
7236 | list_splice_tail(&repoll, &list); | |
7237 | list_splice(&list, &sd->poll_list); | |
7238 | if (!list_empty(&sd->poll_list)) | |
7239 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
7240 | ||
e326bed2 | 7241 | net_rps_action_and_irq_enable(sd); |
1da177e4 LT |
7242 | } |
7243 | ||
aa9d8560 | 7244 | struct netdev_adjacent { |
9ff162a8 | 7245 | struct net_device *dev; |
5d261913 VF |
7246 | |
7247 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 7248 | bool master; |
5d261913 | 7249 | |
32b6d34f TY |
7250 | /* lookup ignore flag */ |
7251 | bool ignore; | |
7252 | ||
5d261913 VF |
7253 | /* counter for the number of times this device was added to us */ |
7254 | u16 ref_nr; | |
7255 | ||
402dae96 VF |
7256 | /* private field for the users */ |
7257 | void *private; | |
7258 | ||
9ff162a8 JP |
7259 | struct list_head list; |
7260 | struct rcu_head rcu; | |
9ff162a8 JP |
7261 | }; |
7262 | ||
6ea29da1 | 7263 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
2f268f12 | 7264 | struct list_head *adj_list) |
9ff162a8 | 7265 | { |
5d261913 | 7266 | struct netdev_adjacent *adj; |
5d261913 | 7267 | |
2f268f12 | 7268 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
7269 | if (adj->dev == adj_dev) |
7270 | return adj; | |
9ff162a8 JP |
7271 | } |
7272 | return NULL; | |
7273 | } | |
7274 | ||
eff74233 TY |
7275 | static int ____netdev_has_upper_dev(struct net_device *upper_dev, |
7276 | struct netdev_nested_priv *priv) | |
f1170fd4 | 7277 | { |
eff74233 | 7278 | struct net_device *dev = (struct net_device *)priv->data; |
f1170fd4 DA |
7279 | |
7280 | return upper_dev == dev; | |
7281 | } | |
7282 | ||
9ff162a8 JP |
7283 | /** |
7284 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
7285 | * @dev: device | |
7286 | * @upper_dev: upper device to check | |
7287 | * | |
7288 | * Find out if a device is linked to specified upper device and return true | |
7289 | * in case it is. Note that this checks only immediate upper device, | |
7290 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
7291 | */ | |
7292 | bool netdev_has_upper_dev(struct net_device *dev, | |
7293 | struct net_device *upper_dev) | |
7294 | { | |
eff74233 TY |
7295 | struct netdev_nested_priv priv = { |
7296 | .data = (void *)upper_dev, | |
7297 | }; | |
7298 | ||
9ff162a8 JP |
7299 | ASSERT_RTNL(); |
7300 | ||
32b6d34f | 7301 | return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
eff74233 | 7302 | &priv); |
9ff162a8 JP |
7303 | } |
7304 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
7305 | ||
1a3f060c | 7306 | /** |
c1639be9 | 7307 | * netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device |
1a3f060c DA |
7308 | * @dev: device |
7309 | * @upper_dev: upper device to check | |
7310 | * | |
7311 | * Find out if a device is linked to specified upper device and return true | |
7312 | * in case it is. Note that this checks the entire upper device chain. | |
7313 | * The caller must hold rcu lock. | |
7314 | */ | |
7315 | ||
1a3f060c DA |
7316 | bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
7317 | struct net_device *upper_dev) | |
7318 | { | |
eff74233 TY |
7319 | struct netdev_nested_priv priv = { |
7320 | .data = (void *)upper_dev, | |
7321 | }; | |
7322 | ||
32b6d34f | 7323 | return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
eff74233 | 7324 | &priv); |
1a3f060c DA |
7325 | } |
7326 | EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); | |
7327 | ||
9ff162a8 JP |
7328 | /** |
7329 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
7330 | * @dev: device | |
7331 | * | |
7332 | * Find out if a device is linked to an upper device and return true in case | |
7333 | * it is. The caller must hold the RTNL lock. | |
7334 | */ | |
25cc72a3 | 7335 | bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
7336 | { |
7337 | ASSERT_RTNL(); | |
7338 | ||
f1170fd4 | 7339 | return !list_empty(&dev->adj_list.upper); |
9ff162a8 | 7340 | } |
25cc72a3 | 7341 | EXPORT_SYMBOL(netdev_has_any_upper_dev); |
9ff162a8 JP |
7342 | |
7343 | /** | |
7344 | * netdev_master_upper_dev_get - Get master upper device | |
7345 | * @dev: device | |
7346 | * | |
7347 | * Find a master upper device and return pointer to it or NULL in case | |
7348 | * it's not there. The caller must hold the RTNL lock. | |
7349 | */ | |
7350 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
7351 | { | |
aa9d8560 | 7352 | struct netdev_adjacent *upper; |
9ff162a8 JP |
7353 | |
7354 | ASSERT_RTNL(); | |
7355 | ||
2f268f12 | 7356 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
7357 | return NULL; |
7358 | ||
2f268f12 | 7359 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 7360 | struct netdev_adjacent, list); |
9ff162a8 JP |
7361 | if (likely(upper->master)) |
7362 | return upper->dev; | |
7363 | return NULL; | |
7364 | } | |
7365 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
7366 | ||
32b6d34f TY |
7367 | static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev) |
7368 | { | |
7369 | struct netdev_adjacent *upper; | |
7370 | ||
7371 | ASSERT_RTNL(); | |
7372 | ||
7373 | if (list_empty(&dev->adj_list.upper)) | |
7374 | return NULL; | |
7375 | ||
7376 | upper = list_first_entry(&dev->adj_list.upper, | |
7377 | struct netdev_adjacent, list); | |
7378 | if (likely(upper->master) && !upper->ignore) | |
7379 | return upper->dev; | |
7380 | return NULL; | |
7381 | } | |
7382 | ||
0f524a80 DA |
7383 | /** |
7384 | * netdev_has_any_lower_dev - Check if device is linked to some device | |
7385 | * @dev: device | |
7386 | * | |
7387 | * Find out if a device is linked to a lower device and return true in case | |
7388 | * it is. The caller must hold the RTNL lock. | |
7389 | */ | |
7390 | static bool netdev_has_any_lower_dev(struct net_device *dev) | |
7391 | { | |
7392 | ASSERT_RTNL(); | |
7393 | ||
7394 | return !list_empty(&dev->adj_list.lower); | |
7395 | } | |
7396 | ||
b6ccba4c VF |
7397 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
7398 | { | |
7399 | struct netdev_adjacent *adj; | |
7400 | ||
7401 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
7402 | ||
7403 | return adj->private; | |
7404 | } | |
7405 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
7406 | ||
44a40855 VY |
7407 | /** |
7408 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
7409 | * @dev: device | |
7410 | * @iter: list_head ** of the current position | |
7411 | * | |
7412 | * Gets the next device from the dev's upper list, starting from iter | |
7413 | * position. The caller must hold RCU read lock. | |
7414 | */ | |
7415 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
7416 | struct list_head **iter) | |
7417 | { | |
7418 | struct netdev_adjacent *upper; | |
7419 | ||
7420 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
7421 | ||
7422 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7423 | ||
7424 | if (&upper->list == &dev->adj_list.upper) | |
7425 | return NULL; | |
7426 | ||
7427 | *iter = &upper->list; | |
7428 | ||
7429 | return upper->dev; | |
7430 | } | |
7431 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
7432 | ||
32b6d34f TY |
7433 | static struct net_device *__netdev_next_upper_dev(struct net_device *dev, |
7434 | struct list_head **iter, | |
7435 | bool *ignore) | |
5343da4c TY |
7436 | { |
7437 | struct netdev_adjacent *upper; | |
7438 | ||
7439 | upper = list_entry((*iter)->next, struct netdev_adjacent, list); | |
7440 | ||
7441 | if (&upper->list == &dev->adj_list.upper) | |
7442 | return NULL; | |
7443 | ||
7444 | *iter = &upper->list; | |
32b6d34f | 7445 | *ignore = upper->ignore; |
5343da4c TY |
7446 | |
7447 | return upper->dev; | |
7448 | } | |
7449 | ||
1a3f060c DA |
7450 | static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
7451 | struct list_head **iter) | |
7452 | { | |
7453 | struct netdev_adjacent *upper; | |
7454 | ||
7455 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
7456 | ||
7457 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7458 | ||
7459 | if (&upper->list == &dev->adj_list.upper) | |
7460 | return NULL; | |
7461 | ||
7462 | *iter = &upper->list; | |
7463 | ||
7464 | return upper->dev; | |
7465 | } | |
7466 | ||
32b6d34f TY |
7467 | static int __netdev_walk_all_upper_dev(struct net_device *dev, |
7468 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7469 | struct netdev_nested_priv *priv), |
7470 | struct netdev_nested_priv *priv) | |
5343da4c TY |
7471 | { |
7472 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7473 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7474 | int ret, cur = 0; | |
32b6d34f | 7475 | bool ignore; |
5343da4c TY |
7476 | |
7477 | now = dev; | |
7478 | iter = &dev->adj_list.upper; | |
7479 | ||
7480 | while (1) { | |
7481 | if (now != dev) { | |
eff74233 | 7482 | ret = fn(now, priv); |
5343da4c TY |
7483 | if (ret) |
7484 | return ret; | |
7485 | } | |
7486 | ||
7487 | next = NULL; | |
7488 | while (1) { | |
32b6d34f | 7489 | udev = __netdev_next_upper_dev(now, &iter, &ignore); |
5343da4c TY |
7490 | if (!udev) |
7491 | break; | |
32b6d34f TY |
7492 | if (ignore) |
7493 | continue; | |
5343da4c TY |
7494 | |
7495 | next = udev; | |
7496 | niter = &udev->adj_list.upper; | |
7497 | dev_stack[cur] = now; | |
7498 | iter_stack[cur++] = iter; | |
7499 | break; | |
7500 | } | |
7501 | ||
7502 | if (!next) { | |
7503 | if (!cur) | |
7504 | return 0; | |
7505 | next = dev_stack[--cur]; | |
7506 | niter = iter_stack[cur]; | |
7507 | } | |
7508 | ||
7509 | now = next; | |
7510 | iter = niter; | |
7511 | } | |
7512 | ||
7513 | return 0; | |
7514 | } | |
7515 | ||
1a3f060c DA |
7516 | int netdev_walk_all_upper_dev_rcu(struct net_device *dev, |
7517 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7518 | struct netdev_nested_priv *priv), |
7519 | struct netdev_nested_priv *priv) | |
1a3f060c | 7520 | { |
5343da4c TY |
7521 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
7522 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7523 | int ret, cur = 0; | |
1a3f060c | 7524 | |
5343da4c TY |
7525 | now = dev; |
7526 | iter = &dev->adj_list.upper; | |
1a3f060c | 7527 | |
5343da4c TY |
7528 | while (1) { |
7529 | if (now != dev) { | |
eff74233 | 7530 | ret = fn(now, priv); |
5343da4c TY |
7531 | if (ret) |
7532 | return ret; | |
7533 | } | |
7534 | ||
7535 | next = NULL; | |
7536 | while (1) { | |
7537 | udev = netdev_next_upper_dev_rcu(now, &iter); | |
7538 | if (!udev) | |
7539 | break; | |
7540 | ||
7541 | next = udev; | |
7542 | niter = &udev->adj_list.upper; | |
7543 | dev_stack[cur] = now; | |
7544 | iter_stack[cur++] = iter; | |
7545 | break; | |
7546 | } | |
7547 | ||
7548 | if (!next) { | |
7549 | if (!cur) | |
7550 | return 0; | |
7551 | next = dev_stack[--cur]; | |
7552 | niter = iter_stack[cur]; | |
7553 | } | |
7554 | ||
7555 | now = next; | |
7556 | iter = niter; | |
1a3f060c DA |
7557 | } |
7558 | ||
7559 | return 0; | |
7560 | } | |
7561 | EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); | |
7562 | ||
32b6d34f TY |
7563 | static bool __netdev_has_upper_dev(struct net_device *dev, |
7564 | struct net_device *upper_dev) | |
7565 | { | |
eff74233 | 7566 | struct netdev_nested_priv priv = { |
1fc70edb | 7567 | .flags = 0, |
eff74233 TY |
7568 | .data = (void *)upper_dev, |
7569 | }; | |
7570 | ||
32b6d34f TY |
7571 | ASSERT_RTNL(); |
7572 | ||
7573 | return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev, | |
eff74233 | 7574 | &priv); |
32b6d34f TY |
7575 | } |
7576 | ||
31088a11 VF |
7577 | /** |
7578 | * netdev_lower_get_next_private - Get the next ->private from the | |
7579 | * lower neighbour list | |
7580 | * @dev: device | |
7581 | * @iter: list_head ** of the current position | |
7582 | * | |
7583 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
7584 | * list, starting from iter position. The caller must hold either hold the | |
7585 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
b469139e | 7586 | * list will remain unchanged. |
31088a11 VF |
7587 | */ |
7588 | void *netdev_lower_get_next_private(struct net_device *dev, | |
7589 | struct list_head **iter) | |
7590 | { | |
7591 | struct netdev_adjacent *lower; | |
7592 | ||
7593 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
7594 | ||
7595 | if (&lower->list == &dev->adj_list.lower) | |
7596 | return NULL; | |
7597 | ||
6859e7df | 7598 | *iter = lower->list.next; |
31088a11 VF |
7599 | |
7600 | return lower->private; | |
7601 | } | |
7602 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
7603 | ||
7604 | /** | |
7605 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
7606 | * lower neighbour list, RCU | |
7607 | * variant | |
7608 | * @dev: device | |
7609 | * @iter: list_head ** of the current position | |
7610 | * | |
7611 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
7612 | * list, starting from iter position. The caller must hold RCU read lock. | |
7613 | */ | |
7614 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
7615 | struct list_head **iter) | |
7616 | { | |
7617 | struct netdev_adjacent *lower; | |
7618 | ||
7619 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
7620 | ||
7621 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7622 | ||
7623 | if (&lower->list == &dev->adj_list.lower) | |
7624 | return NULL; | |
7625 | ||
6859e7df | 7626 | *iter = &lower->list; |
31088a11 VF |
7627 | |
7628 | return lower->private; | |
7629 | } | |
7630 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
7631 | ||
4085ebe8 VY |
7632 | /** |
7633 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
7634 | * list | |
7635 | * @dev: device | |
7636 | * @iter: list_head ** of the current position | |
7637 | * | |
7638 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
7639 | * list, starting from iter position. The caller must hold RTNL lock or | |
7640 | * its own locking that guarantees that the neighbour lower | |
b469139e | 7641 | * list will remain unchanged. |
4085ebe8 VY |
7642 | */ |
7643 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
7644 | { | |
7645 | struct netdev_adjacent *lower; | |
7646 | ||
cfdd28be | 7647 | lower = list_entry(*iter, struct netdev_adjacent, list); |
4085ebe8 VY |
7648 | |
7649 | if (&lower->list == &dev->adj_list.lower) | |
7650 | return NULL; | |
7651 | ||
cfdd28be | 7652 | *iter = lower->list.next; |
4085ebe8 VY |
7653 | |
7654 | return lower->dev; | |
7655 | } | |
7656 | EXPORT_SYMBOL(netdev_lower_get_next); | |
7657 | ||
1a3f060c DA |
7658 | static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
7659 | struct list_head **iter) | |
7660 | { | |
7661 | struct netdev_adjacent *lower; | |
7662 | ||
46b5ab1a | 7663 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
1a3f060c DA |
7664 | |
7665 | if (&lower->list == &dev->adj_list.lower) | |
7666 | return NULL; | |
7667 | ||
46b5ab1a | 7668 | *iter = &lower->list; |
1a3f060c DA |
7669 | |
7670 | return lower->dev; | |
7671 | } | |
7672 | ||
32b6d34f TY |
7673 | static struct net_device *__netdev_next_lower_dev(struct net_device *dev, |
7674 | struct list_head **iter, | |
7675 | bool *ignore) | |
7676 | { | |
7677 | struct netdev_adjacent *lower; | |
7678 | ||
7679 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
7680 | ||
7681 | if (&lower->list == &dev->adj_list.lower) | |
7682 | return NULL; | |
7683 | ||
7684 | *iter = &lower->list; | |
7685 | *ignore = lower->ignore; | |
7686 | ||
7687 | return lower->dev; | |
7688 | } | |
7689 | ||
1a3f060c DA |
7690 | int netdev_walk_all_lower_dev(struct net_device *dev, |
7691 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7692 | struct netdev_nested_priv *priv), |
7693 | struct netdev_nested_priv *priv) | |
1a3f060c | 7694 | { |
5343da4c TY |
7695 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
7696 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7697 | int ret, cur = 0; | |
1a3f060c | 7698 | |
5343da4c TY |
7699 | now = dev; |
7700 | iter = &dev->adj_list.lower; | |
1a3f060c | 7701 | |
5343da4c TY |
7702 | while (1) { |
7703 | if (now != dev) { | |
eff74233 | 7704 | ret = fn(now, priv); |
5343da4c TY |
7705 | if (ret) |
7706 | return ret; | |
7707 | } | |
7708 | ||
7709 | next = NULL; | |
7710 | while (1) { | |
7711 | ldev = netdev_next_lower_dev(now, &iter); | |
7712 | if (!ldev) | |
7713 | break; | |
7714 | ||
7715 | next = ldev; | |
7716 | niter = &ldev->adj_list.lower; | |
7717 | dev_stack[cur] = now; | |
7718 | iter_stack[cur++] = iter; | |
7719 | break; | |
7720 | } | |
7721 | ||
7722 | if (!next) { | |
7723 | if (!cur) | |
7724 | return 0; | |
7725 | next = dev_stack[--cur]; | |
7726 | niter = iter_stack[cur]; | |
7727 | } | |
7728 | ||
7729 | now = next; | |
7730 | iter = niter; | |
1a3f060c DA |
7731 | } |
7732 | ||
7733 | return 0; | |
7734 | } | |
7735 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); | |
7736 | ||
32b6d34f TY |
7737 | static int __netdev_walk_all_lower_dev(struct net_device *dev, |
7738 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7739 | struct netdev_nested_priv *priv), |
7740 | struct netdev_nested_priv *priv) | |
32b6d34f TY |
7741 | { |
7742 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7743 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7744 | int ret, cur = 0; | |
7745 | bool ignore; | |
7746 | ||
7747 | now = dev; | |
7748 | iter = &dev->adj_list.lower; | |
7749 | ||
7750 | while (1) { | |
7751 | if (now != dev) { | |
eff74233 | 7752 | ret = fn(now, priv); |
32b6d34f TY |
7753 | if (ret) |
7754 | return ret; | |
7755 | } | |
7756 | ||
7757 | next = NULL; | |
7758 | while (1) { | |
7759 | ldev = __netdev_next_lower_dev(now, &iter, &ignore); | |
7760 | if (!ldev) | |
7761 | break; | |
7762 | if (ignore) | |
7763 | continue; | |
7764 | ||
7765 | next = ldev; | |
7766 | niter = &ldev->adj_list.lower; | |
7767 | dev_stack[cur] = now; | |
7768 | iter_stack[cur++] = iter; | |
7769 | break; | |
7770 | } | |
7771 | ||
7772 | if (!next) { | |
7773 | if (!cur) | |
7774 | return 0; | |
7775 | next = dev_stack[--cur]; | |
7776 | niter = iter_stack[cur]; | |
7777 | } | |
7778 | ||
7779 | now = next; | |
7780 | iter = niter; | |
7781 | } | |
7782 | ||
7783 | return 0; | |
7784 | } | |
7785 | ||
7151affe TY |
7786 | struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
7787 | struct list_head **iter) | |
1a3f060c DA |
7788 | { |
7789 | struct netdev_adjacent *lower; | |
7790 | ||
7791 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7792 | if (&lower->list == &dev->adj_list.lower) | |
7793 | return NULL; | |
7794 | ||
7795 | *iter = &lower->list; | |
7796 | ||
7797 | return lower->dev; | |
7798 | } | |
7151affe | 7799 | EXPORT_SYMBOL(netdev_next_lower_dev_rcu); |
1a3f060c | 7800 | |
5343da4c TY |
7801 | static u8 __netdev_upper_depth(struct net_device *dev) |
7802 | { | |
7803 | struct net_device *udev; | |
7804 | struct list_head *iter; | |
7805 | u8 max_depth = 0; | |
32b6d34f | 7806 | bool ignore; |
5343da4c TY |
7807 | |
7808 | for (iter = &dev->adj_list.upper, | |
32b6d34f | 7809 | udev = __netdev_next_upper_dev(dev, &iter, &ignore); |
5343da4c | 7810 | udev; |
32b6d34f TY |
7811 | udev = __netdev_next_upper_dev(dev, &iter, &ignore)) { |
7812 | if (ignore) | |
7813 | continue; | |
5343da4c TY |
7814 | if (max_depth < udev->upper_level) |
7815 | max_depth = udev->upper_level; | |
7816 | } | |
7817 | ||
7818 | return max_depth; | |
7819 | } | |
7820 | ||
7821 | static u8 __netdev_lower_depth(struct net_device *dev) | |
1a3f060c DA |
7822 | { |
7823 | struct net_device *ldev; | |
7824 | struct list_head *iter; | |
5343da4c | 7825 | u8 max_depth = 0; |
32b6d34f | 7826 | bool ignore; |
1a3f060c DA |
7827 | |
7828 | for (iter = &dev->adj_list.lower, | |
32b6d34f | 7829 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore); |
1a3f060c | 7830 | ldev; |
32b6d34f TY |
7831 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) { |
7832 | if (ignore) | |
7833 | continue; | |
5343da4c TY |
7834 | if (max_depth < ldev->lower_level) |
7835 | max_depth = ldev->lower_level; | |
7836 | } | |
1a3f060c | 7837 | |
5343da4c TY |
7838 | return max_depth; |
7839 | } | |
7840 | ||
eff74233 TY |
7841 | static int __netdev_update_upper_level(struct net_device *dev, |
7842 | struct netdev_nested_priv *__unused) | |
5343da4c TY |
7843 | { |
7844 | dev->upper_level = __netdev_upper_depth(dev) + 1; | |
7845 | return 0; | |
7846 | } | |
7847 | ||
eff74233 | 7848 | static int __netdev_update_lower_level(struct net_device *dev, |
1fc70edb | 7849 | struct netdev_nested_priv *priv) |
5343da4c TY |
7850 | { |
7851 | dev->lower_level = __netdev_lower_depth(dev) + 1; | |
1fc70edb TY |
7852 | |
7853 | #ifdef CONFIG_LOCKDEP | |
7854 | if (!priv) | |
7855 | return 0; | |
7856 | ||
7857 | if (priv->flags & NESTED_SYNC_IMM) | |
7858 | dev->nested_level = dev->lower_level - 1; | |
7859 | if (priv->flags & NESTED_SYNC_TODO) | |
7860 | net_unlink_todo(dev); | |
7861 | #endif | |
5343da4c TY |
7862 | return 0; |
7863 | } | |
7864 | ||
7865 | int netdev_walk_all_lower_dev_rcu(struct net_device *dev, | |
7866 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7867 | struct netdev_nested_priv *priv), |
7868 | struct netdev_nested_priv *priv) | |
5343da4c TY |
7869 | { |
7870 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7871 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7872 | int ret, cur = 0; | |
7873 | ||
7874 | now = dev; | |
7875 | iter = &dev->adj_list.lower; | |
7876 | ||
7877 | while (1) { | |
7878 | if (now != dev) { | |
eff74233 | 7879 | ret = fn(now, priv); |
5343da4c TY |
7880 | if (ret) |
7881 | return ret; | |
7882 | } | |
7883 | ||
7884 | next = NULL; | |
7885 | while (1) { | |
7886 | ldev = netdev_next_lower_dev_rcu(now, &iter); | |
7887 | if (!ldev) | |
7888 | break; | |
7889 | ||
7890 | next = ldev; | |
7891 | niter = &ldev->adj_list.lower; | |
7892 | dev_stack[cur] = now; | |
7893 | iter_stack[cur++] = iter; | |
7894 | break; | |
7895 | } | |
7896 | ||
7897 | if (!next) { | |
7898 | if (!cur) | |
7899 | return 0; | |
7900 | next = dev_stack[--cur]; | |
7901 | niter = iter_stack[cur]; | |
7902 | } | |
7903 | ||
7904 | now = next; | |
7905 | iter = niter; | |
1a3f060c DA |
7906 | } |
7907 | ||
7908 | return 0; | |
7909 | } | |
7910 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); | |
7911 | ||
e001bfad | 7912 | /** |
7913 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
7914 | * lower neighbour list, RCU | |
7915 | * variant | |
7916 | * @dev: device | |
7917 | * | |
7918 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
7919 | * list. The caller must hold RCU read lock. | |
7920 | */ | |
7921 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
7922 | { | |
7923 | struct netdev_adjacent *lower; | |
7924 | ||
7925 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
7926 | struct netdev_adjacent, list); | |
7927 | if (lower) | |
7928 | return lower->private; | |
7929 | return NULL; | |
7930 | } | |
7931 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
7932 | ||
9ff162a8 JP |
7933 | /** |
7934 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
7935 | * @dev: device | |
7936 | * | |
7937 | * Find a master upper device and return pointer to it or NULL in case | |
7938 | * it's not there. The caller must hold the RCU read lock. | |
7939 | */ | |
7940 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
7941 | { | |
aa9d8560 | 7942 | struct netdev_adjacent *upper; |
9ff162a8 | 7943 | |
2f268f12 | 7944 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 7945 | struct netdev_adjacent, list); |
9ff162a8 JP |
7946 | if (upper && likely(upper->master)) |
7947 | return upper->dev; | |
7948 | return NULL; | |
7949 | } | |
7950 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
7951 | ||
0a59f3a9 | 7952 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
7953 | struct net_device *adj_dev, |
7954 | struct list_head *dev_list) | |
7955 | { | |
7956 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7957 | |
3ee32707 VF |
7958 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7959 | "upper_%s" : "lower_%s", adj_dev->name); | |
7960 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
7961 | linkname); | |
7962 | } | |
0a59f3a9 | 7963 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
7964 | char *name, |
7965 | struct list_head *dev_list) | |
7966 | { | |
7967 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7968 | |
3ee32707 VF |
7969 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7970 | "upper_%s" : "lower_%s", name); | |
7971 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
7972 | } | |
7973 | ||
7ce64c79 AF |
7974 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
7975 | struct net_device *adj_dev, | |
7976 | struct list_head *dev_list) | |
7977 | { | |
7978 | return (dev_list == &dev->adj_list.upper || | |
7979 | dev_list == &dev->adj_list.lower) && | |
7980 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
7981 | } | |
3ee32707 | 7982 | |
5d261913 VF |
7983 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
7984 | struct net_device *adj_dev, | |
7863c054 | 7985 | struct list_head *dev_list, |
402dae96 | 7986 | void *private, bool master) |
5d261913 VF |
7987 | { |
7988 | struct netdev_adjacent *adj; | |
842d67a7 | 7989 | int ret; |
5d261913 | 7990 | |
6ea29da1 | 7991 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 VF |
7992 | |
7993 | if (adj) { | |
790510d9 | 7994 | adj->ref_nr += 1; |
67b62f98 DA |
7995 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
7996 | dev->name, adj_dev->name, adj->ref_nr); | |
7997 | ||
5d261913 VF |
7998 | return 0; |
7999 | } | |
8000 | ||
8001 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
8002 | if (!adj) | |
8003 | return -ENOMEM; | |
8004 | ||
8005 | adj->dev = adj_dev; | |
8006 | adj->master = master; | |
790510d9 | 8007 | adj->ref_nr = 1; |
402dae96 | 8008 | adj->private = private; |
32b6d34f | 8009 | adj->ignore = false; |
5d261913 | 8010 | dev_hold(adj_dev); |
2f268f12 | 8011 | |
67b62f98 DA |
8012 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
8013 | dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); | |
5d261913 | 8014 | |
7ce64c79 | 8015 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 8016 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
8017 | if (ret) |
8018 | goto free_adj; | |
8019 | } | |
8020 | ||
7863c054 | 8021 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
8022 | if (master) { |
8023 | ret = sysfs_create_link(&(dev->dev.kobj), | |
8024 | &(adj_dev->dev.kobj), "master"); | |
8025 | if (ret) | |
5831d66e | 8026 | goto remove_symlinks; |
842d67a7 | 8027 | |
7863c054 | 8028 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 8029 | } else { |
7863c054 | 8030 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 8031 | } |
5d261913 VF |
8032 | |
8033 | return 0; | |
842d67a7 | 8034 | |
5831d66e | 8035 | remove_symlinks: |
7ce64c79 | 8036 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 8037 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
8038 | free_adj: |
8039 | kfree(adj); | |
974daef7 | 8040 | dev_put(adj_dev); |
842d67a7 VF |
8041 | |
8042 | return ret; | |
5d261913 VF |
8043 | } |
8044 | ||
1d143d9f | 8045 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
8046 | struct net_device *adj_dev, | |
93409033 | 8047 | u16 ref_nr, |
1d143d9f | 8048 | struct list_head *dev_list) |
5d261913 VF |
8049 | { |
8050 | struct netdev_adjacent *adj; | |
8051 | ||
67b62f98 DA |
8052 | pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
8053 | dev->name, adj_dev->name, ref_nr); | |
8054 | ||
6ea29da1 | 8055 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 | 8056 | |
2f268f12 | 8057 | if (!adj) { |
67b62f98 | 8058 | pr_err("Adjacency does not exist for device %s from %s\n", |
2f268f12 | 8059 | dev->name, adj_dev->name); |
67b62f98 DA |
8060 | WARN_ON(1); |
8061 | return; | |
2f268f12 | 8062 | } |
5d261913 | 8063 | |
93409033 | 8064 | if (adj->ref_nr > ref_nr) { |
67b62f98 DA |
8065 | pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
8066 | dev->name, adj_dev->name, ref_nr, | |
8067 | adj->ref_nr - ref_nr); | |
93409033 | 8068 | adj->ref_nr -= ref_nr; |
5d261913 VF |
8069 | return; |
8070 | } | |
8071 | ||
842d67a7 VF |
8072 | if (adj->master) |
8073 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
8074 | ||
7ce64c79 | 8075 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 8076 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 8077 | |
5d261913 | 8078 | list_del_rcu(&adj->list); |
67b62f98 | 8079 | pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
2f268f12 | 8080 | adj_dev->name, dev->name, adj_dev->name); |
5d261913 VF |
8081 | dev_put(adj_dev); |
8082 | kfree_rcu(adj, rcu); | |
8083 | } | |
8084 | ||
1d143d9f | 8085 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
8086 | struct net_device *upper_dev, | |
8087 | struct list_head *up_list, | |
8088 | struct list_head *down_list, | |
8089 | void *private, bool master) | |
5d261913 VF |
8090 | { |
8091 | int ret; | |
8092 | ||
790510d9 | 8093 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
93409033 | 8094 | private, master); |
5d261913 VF |
8095 | if (ret) |
8096 | return ret; | |
8097 | ||
790510d9 | 8098 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
93409033 | 8099 | private, false); |
5d261913 | 8100 | if (ret) { |
790510d9 | 8101 | __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
5d261913 VF |
8102 | return ret; |
8103 | } | |
8104 | ||
8105 | return 0; | |
8106 | } | |
8107 | ||
1d143d9f | 8108 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
8109 | struct net_device *upper_dev, | |
93409033 | 8110 | u16 ref_nr, |
1d143d9f | 8111 | struct list_head *up_list, |
8112 | struct list_head *down_list) | |
5d261913 | 8113 | { |
93409033 AC |
8114 | __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
8115 | __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); | |
5d261913 VF |
8116 | } |
8117 | ||
1d143d9f | 8118 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
8119 | struct net_device *upper_dev, | |
8120 | void *private, bool master) | |
2f268f12 | 8121 | { |
f1170fd4 DA |
8122 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
8123 | &dev->adj_list.upper, | |
8124 | &upper_dev->adj_list.lower, | |
8125 | private, master); | |
5d261913 VF |
8126 | } |
8127 | ||
1d143d9f | 8128 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
8129 | struct net_device *upper_dev) | |
2f268f12 | 8130 | { |
93409033 | 8131 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
2f268f12 VF |
8132 | &dev->adj_list.upper, |
8133 | &upper_dev->adj_list.lower); | |
8134 | } | |
5d261913 | 8135 | |
9ff162a8 | 8136 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 | 8137 | struct net_device *upper_dev, bool master, |
42ab19ee | 8138 | void *upper_priv, void *upper_info, |
1fc70edb | 8139 | struct netdev_nested_priv *priv, |
42ab19ee | 8140 | struct netlink_ext_ack *extack) |
9ff162a8 | 8141 | { |
51d0c047 DA |
8142 | struct netdev_notifier_changeupper_info changeupper_info = { |
8143 | .info = { | |
8144 | .dev = dev, | |
42ab19ee | 8145 | .extack = extack, |
51d0c047 DA |
8146 | }, |
8147 | .upper_dev = upper_dev, | |
8148 | .master = master, | |
8149 | .linking = true, | |
8150 | .upper_info = upper_info, | |
8151 | }; | |
50d629e7 | 8152 | struct net_device *master_dev; |
5d261913 | 8153 | int ret = 0; |
9ff162a8 JP |
8154 | |
8155 | ASSERT_RTNL(); | |
8156 | ||
8157 | if (dev == upper_dev) | |
8158 | return -EBUSY; | |
8159 | ||
8160 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
32b6d34f | 8161 | if (__netdev_has_upper_dev(upper_dev, dev)) |
9ff162a8 JP |
8162 | return -EBUSY; |
8163 | ||
5343da4c TY |
8164 | if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV) |
8165 | return -EMLINK; | |
8166 | ||
50d629e7 | 8167 | if (!master) { |
32b6d34f | 8168 | if (__netdev_has_upper_dev(dev, upper_dev)) |
50d629e7 MM |
8169 | return -EEXIST; |
8170 | } else { | |
32b6d34f | 8171 | master_dev = __netdev_master_upper_dev_get(dev); |
50d629e7 MM |
8172 | if (master_dev) |
8173 | return master_dev == upper_dev ? -EEXIST : -EBUSY; | |
8174 | } | |
9ff162a8 | 8175 | |
51d0c047 | 8176 | ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
8177 | &changeupper_info.info); |
8178 | ret = notifier_to_errno(ret); | |
8179 | if (ret) | |
8180 | return ret; | |
8181 | ||
6dffb044 | 8182 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
402dae96 | 8183 | master); |
5d261913 VF |
8184 | if (ret) |
8185 | return ret; | |
9ff162a8 | 8186 | |
51d0c047 | 8187 | ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
b03804e7 IS |
8188 | &changeupper_info.info); |
8189 | ret = notifier_to_errno(ret); | |
8190 | if (ret) | |
f1170fd4 | 8191 | goto rollback; |
b03804e7 | 8192 | |
5343da4c | 8193 | __netdev_update_upper_level(dev, NULL); |
32b6d34f | 8194 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c | 8195 | |
1fc70edb | 8196 | __netdev_update_lower_level(upper_dev, priv); |
32b6d34f | 8197 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
1fc70edb | 8198 | priv); |
5343da4c | 8199 | |
9ff162a8 | 8200 | return 0; |
5d261913 | 8201 | |
f1170fd4 | 8202 | rollback: |
2f268f12 | 8203 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
8204 | |
8205 | return ret; | |
9ff162a8 JP |
8206 | } |
8207 | ||
8208 | /** | |
8209 | * netdev_upper_dev_link - Add a link to the upper device | |
8210 | * @dev: device | |
8211 | * @upper_dev: new upper device | |
7a006d59 | 8212 | * @extack: netlink extended ack |
9ff162a8 JP |
8213 | * |
8214 | * Adds a link to device which is upper to this one. The caller must hold | |
8215 | * the RTNL lock. On a failure a negative errno code is returned. | |
8216 | * On success the reference counts are adjusted and the function | |
8217 | * returns zero. | |
8218 | */ | |
8219 | int netdev_upper_dev_link(struct net_device *dev, | |
42ab19ee DA |
8220 | struct net_device *upper_dev, |
8221 | struct netlink_ext_ack *extack) | |
9ff162a8 | 8222 | { |
1fc70edb TY |
8223 | struct netdev_nested_priv priv = { |
8224 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
8225 | .data = NULL, | |
8226 | }; | |
8227 | ||
42ab19ee | 8228 | return __netdev_upper_dev_link(dev, upper_dev, false, |
1fc70edb | 8229 | NULL, NULL, &priv, extack); |
9ff162a8 JP |
8230 | } |
8231 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
8232 | ||
8233 | /** | |
8234 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
8235 | * @dev: device | |
8236 | * @upper_dev: new upper device | |
6dffb044 | 8237 | * @upper_priv: upper device private |
29bf24af | 8238 | * @upper_info: upper info to be passed down via notifier |
7a006d59 | 8239 | * @extack: netlink extended ack |
9ff162a8 JP |
8240 | * |
8241 | * Adds a link to device which is upper to this one. In this case, only | |
8242 | * one master upper device can be linked, although other non-master devices | |
8243 | * might be linked as well. The caller must hold the RTNL lock. | |
8244 | * On a failure a negative errno code is returned. On success the reference | |
8245 | * counts are adjusted and the function returns zero. | |
8246 | */ | |
8247 | int netdev_master_upper_dev_link(struct net_device *dev, | |
6dffb044 | 8248 | struct net_device *upper_dev, |
42ab19ee DA |
8249 | void *upper_priv, void *upper_info, |
8250 | struct netlink_ext_ack *extack) | |
9ff162a8 | 8251 | { |
1fc70edb TY |
8252 | struct netdev_nested_priv priv = { |
8253 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
8254 | .data = NULL, | |
8255 | }; | |
8256 | ||
29bf24af | 8257 | return __netdev_upper_dev_link(dev, upper_dev, true, |
1fc70edb | 8258 | upper_priv, upper_info, &priv, extack); |
9ff162a8 JP |
8259 | } |
8260 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
8261 | ||
fe8300fd | 8262 | static void __netdev_upper_dev_unlink(struct net_device *dev, |
1fc70edb TY |
8263 | struct net_device *upper_dev, |
8264 | struct netdev_nested_priv *priv) | |
9ff162a8 | 8265 | { |
51d0c047 DA |
8266 | struct netdev_notifier_changeupper_info changeupper_info = { |
8267 | .info = { | |
8268 | .dev = dev, | |
8269 | }, | |
8270 | .upper_dev = upper_dev, | |
8271 | .linking = false, | |
8272 | }; | |
f4563a75 | 8273 | |
9ff162a8 JP |
8274 | ASSERT_RTNL(); |
8275 | ||
0e4ead9d | 8276 | changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; |
0e4ead9d | 8277 | |
51d0c047 | 8278 | call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
8279 | &changeupper_info.info); |
8280 | ||
2f268f12 | 8281 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 | 8282 | |
51d0c047 | 8283 | call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
0e4ead9d | 8284 | &changeupper_info.info); |
5343da4c TY |
8285 | |
8286 | __netdev_update_upper_level(dev, NULL); | |
32b6d34f | 8287 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c | 8288 | |
1fc70edb | 8289 | __netdev_update_lower_level(upper_dev, priv); |
32b6d34f | 8290 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
1fc70edb | 8291 | priv); |
9ff162a8 | 8292 | } |
fe8300fd TY |
8293 | |
8294 | /** | |
8295 | * netdev_upper_dev_unlink - Removes a link to upper device | |
8296 | * @dev: device | |
8297 | * @upper_dev: new upper device | |
8298 | * | |
8299 | * Removes a link to device which is upper to this one. The caller must hold | |
8300 | * the RTNL lock. | |
8301 | */ | |
8302 | void netdev_upper_dev_unlink(struct net_device *dev, | |
8303 | struct net_device *upper_dev) | |
8304 | { | |
1fc70edb TY |
8305 | struct netdev_nested_priv priv = { |
8306 | .flags = NESTED_SYNC_TODO, | |
8307 | .data = NULL, | |
8308 | }; | |
8309 | ||
8310 | __netdev_upper_dev_unlink(dev, upper_dev, &priv); | |
9ff162a8 JP |
8311 | } |
8312 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
8313 | ||
32b6d34f TY |
8314 | static void __netdev_adjacent_dev_set(struct net_device *upper_dev, |
8315 | struct net_device *lower_dev, | |
8316 | bool val) | |
8317 | { | |
8318 | struct netdev_adjacent *adj; | |
8319 | ||
8320 | adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower); | |
8321 | if (adj) | |
8322 | adj->ignore = val; | |
8323 | ||
8324 | adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper); | |
8325 | if (adj) | |
8326 | adj->ignore = val; | |
8327 | } | |
8328 | ||
8329 | static void netdev_adjacent_dev_disable(struct net_device *upper_dev, | |
8330 | struct net_device *lower_dev) | |
8331 | { | |
8332 | __netdev_adjacent_dev_set(upper_dev, lower_dev, true); | |
8333 | } | |
8334 | ||
8335 | static void netdev_adjacent_dev_enable(struct net_device *upper_dev, | |
8336 | struct net_device *lower_dev) | |
8337 | { | |
8338 | __netdev_adjacent_dev_set(upper_dev, lower_dev, false); | |
8339 | } | |
8340 | ||
8341 | int netdev_adjacent_change_prepare(struct net_device *old_dev, | |
8342 | struct net_device *new_dev, | |
8343 | struct net_device *dev, | |
8344 | struct netlink_ext_ack *extack) | |
8345 | { | |
1fc70edb TY |
8346 | struct netdev_nested_priv priv = { |
8347 | .flags = 0, | |
8348 | .data = NULL, | |
8349 | }; | |
32b6d34f TY |
8350 | int err; |
8351 | ||
8352 | if (!new_dev) | |
8353 | return 0; | |
8354 | ||
8355 | if (old_dev && new_dev != old_dev) | |
8356 | netdev_adjacent_dev_disable(dev, old_dev); | |
1fc70edb TY |
8357 | err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv, |
8358 | extack); | |
32b6d34f TY |
8359 | if (err) { |
8360 | if (old_dev && new_dev != old_dev) | |
8361 | netdev_adjacent_dev_enable(dev, old_dev); | |
8362 | return err; | |
8363 | } | |
8364 | ||
8365 | return 0; | |
8366 | } | |
8367 | EXPORT_SYMBOL(netdev_adjacent_change_prepare); | |
8368 | ||
8369 | void netdev_adjacent_change_commit(struct net_device *old_dev, | |
8370 | struct net_device *new_dev, | |
8371 | struct net_device *dev) | |
8372 | { | |
1fc70edb TY |
8373 | struct netdev_nested_priv priv = { |
8374 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
8375 | .data = NULL, | |
8376 | }; | |
8377 | ||
32b6d34f TY |
8378 | if (!new_dev || !old_dev) |
8379 | return; | |
8380 | ||
8381 | if (new_dev == old_dev) | |
8382 | return; | |
8383 | ||
8384 | netdev_adjacent_dev_enable(dev, old_dev); | |
1fc70edb | 8385 | __netdev_upper_dev_unlink(old_dev, dev, &priv); |
32b6d34f TY |
8386 | } |
8387 | EXPORT_SYMBOL(netdev_adjacent_change_commit); | |
8388 | ||
8389 | void netdev_adjacent_change_abort(struct net_device *old_dev, | |
8390 | struct net_device *new_dev, | |
8391 | struct net_device *dev) | |
8392 | { | |
1fc70edb TY |
8393 | struct netdev_nested_priv priv = { |
8394 | .flags = 0, | |
8395 | .data = NULL, | |
8396 | }; | |
8397 | ||
32b6d34f TY |
8398 | if (!new_dev) |
8399 | return; | |
8400 | ||
8401 | if (old_dev && new_dev != old_dev) | |
8402 | netdev_adjacent_dev_enable(dev, old_dev); | |
8403 | ||
1fc70edb | 8404 | __netdev_upper_dev_unlink(new_dev, dev, &priv); |
32b6d34f TY |
8405 | } |
8406 | EXPORT_SYMBOL(netdev_adjacent_change_abort); | |
8407 | ||
61bd3857 MS |
8408 | /** |
8409 | * netdev_bonding_info_change - Dispatch event about slave change | |
8410 | * @dev: device | |
4a26e453 | 8411 | * @bonding_info: info to dispatch |
61bd3857 MS |
8412 | * |
8413 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
8414 | * The caller must hold the RTNL lock. | |
8415 | */ | |
8416 | void netdev_bonding_info_change(struct net_device *dev, | |
8417 | struct netdev_bonding_info *bonding_info) | |
8418 | { | |
51d0c047 DA |
8419 | struct netdev_notifier_bonding_info info = { |
8420 | .info.dev = dev, | |
8421 | }; | |
61bd3857 MS |
8422 | |
8423 | memcpy(&info.bonding_info, bonding_info, | |
8424 | sizeof(struct netdev_bonding_info)); | |
51d0c047 | 8425 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, |
61bd3857 MS |
8426 | &info.info); |
8427 | } | |
8428 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
8429 | ||
cff9f12b MG |
8430 | /** |
8431 | * netdev_get_xmit_slave - Get the xmit slave of master device | |
8842500d | 8432 | * @dev: device |
cff9f12b MG |
8433 | * @skb: The packet |
8434 | * @all_slaves: assume all the slaves are active | |
8435 | * | |
8436 | * The reference counters are not incremented so the caller must be | |
8437 | * careful with locks. The caller must hold RCU lock. | |
8438 | * %NULL is returned if no slave is found. | |
8439 | */ | |
8440 | ||
8441 | struct net_device *netdev_get_xmit_slave(struct net_device *dev, | |
8442 | struct sk_buff *skb, | |
8443 | bool all_slaves) | |
8444 | { | |
8445 | const struct net_device_ops *ops = dev->netdev_ops; | |
8446 | ||
8447 | if (!ops->ndo_get_xmit_slave) | |
8448 | return NULL; | |
8449 | return ops->ndo_get_xmit_slave(dev, skb, all_slaves); | |
8450 | } | |
8451 | EXPORT_SYMBOL(netdev_get_xmit_slave); | |
8452 | ||
719a402c TT |
8453 | static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev, |
8454 | struct sock *sk) | |
8455 | { | |
8456 | const struct net_device_ops *ops = dev->netdev_ops; | |
8457 | ||
8458 | if (!ops->ndo_sk_get_lower_dev) | |
8459 | return NULL; | |
8460 | return ops->ndo_sk_get_lower_dev(dev, sk); | |
8461 | } | |
8462 | ||
8463 | /** | |
8464 | * netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket | |
8465 | * @dev: device | |
8466 | * @sk: the socket | |
8467 | * | |
8468 | * %NULL is returned if no lower device is found. | |
8469 | */ | |
8470 | ||
8471 | struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, | |
8472 | struct sock *sk) | |
8473 | { | |
8474 | struct net_device *lower; | |
8475 | ||
8476 | lower = netdev_sk_get_lower_dev(dev, sk); | |
8477 | while (lower) { | |
8478 | dev = lower; | |
8479 | lower = netdev_sk_get_lower_dev(dev, sk); | |
8480 | } | |
8481 | ||
8482 | return dev; | |
8483 | } | |
8484 | EXPORT_SYMBOL(netdev_sk_get_lowest_dev); | |
8485 | ||
2ce1ee17 | 8486 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
8487 | { |
8488 | struct netdev_adjacent *iter; | |
8489 | ||
8490 | struct net *net = dev_net(dev); | |
8491 | ||
8492 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 8493 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8494 | continue; |
8495 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8496 | &iter->dev->adj_list.lower); | |
8497 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
8498 | &dev->adj_list.upper); | |
8499 | } | |
8500 | ||
8501 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 8502 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8503 | continue; |
8504 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8505 | &iter->dev->adj_list.upper); | |
8506 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
8507 | &dev->adj_list.lower); | |
8508 | } | |
8509 | } | |
8510 | ||
2ce1ee17 | 8511 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
8512 | { |
8513 | struct netdev_adjacent *iter; | |
8514 | ||
8515 | struct net *net = dev_net(dev); | |
8516 | ||
8517 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 8518 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8519 | continue; |
8520 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
8521 | &iter->dev->adj_list.lower); | |
8522 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
8523 | &dev->adj_list.upper); | |
8524 | } | |
8525 | ||
8526 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 8527 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8528 | continue; |
8529 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
8530 | &iter->dev->adj_list.upper); | |
8531 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
8532 | &dev->adj_list.lower); | |
8533 | } | |
8534 | } | |
8535 | ||
5bb025fa | 8536 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 8537 | { |
5bb025fa | 8538 | struct netdev_adjacent *iter; |
402dae96 | 8539 | |
4c75431a AF |
8540 | struct net *net = dev_net(dev); |
8541 | ||
5bb025fa | 8542 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
be4da0e3 | 8543 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 8544 | continue; |
5bb025fa VF |
8545 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
8546 | &iter->dev->adj_list.lower); | |
8547 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8548 | &iter->dev->adj_list.lower); | |
8549 | } | |
402dae96 | 8550 | |
5bb025fa | 8551 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
be4da0e3 | 8552 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 8553 | continue; |
5bb025fa VF |
8554 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
8555 | &iter->dev->adj_list.upper); | |
8556 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8557 | &iter->dev->adj_list.upper); | |
8558 | } | |
402dae96 | 8559 | } |
402dae96 VF |
8560 | |
8561 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
8562 | struct net_device *lower_dev) | |
8563 | { | |
8564 | struct netdev_adjacent *lower; | |
8565 | ||
8566 | if (!lower_dev) | |
8567 | return NULL; | |
6ea29da1 | 8568 | lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
402dae96 VF |
8569 | if (!lower) |
8570 | return NULL; | |
8571 | ||
8572 | return lower->private; | |
8573 | } | |
8574 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
8575 | ||
4085ebe8 | 8576 | |
04d48266 | 8577 | /** |
c1639be9 | 8578 | * netdev_lower_state_changed - Dispatch event about lower device state change |
04d48266 JP |
8579 | * @lower_dev: device |
8580 | * @lower_state_info: state to dispatch | |
8581 | * | |
8582 | * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. | |
8583 | * The caller must hold the RTNL lock. | |
8584 | */ | |
8585 | void netdev_lower_state_changed(struct net_device *lower_dev, | |
8586 | void *lower_state_info) | |
8587 | { | |
51d0c047 DA |
8588 | struct netdev_notifier_changelowerstate_info changelowerstate_info = { |
8589 | .info.dev = lower_dev, | |
8590 | }; | |
04d48266 JP |
8591 | |
8592 | ASSERT_RTNL(); | |
8593 | changelowerstate_info.lower_state_info = lower_state_info; | |
51d0c047 | 8594 | call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, |
04d48266 JP |
8595 | &changelowerstate_info.info); |
8596 | } | |
8597 | EXPORT_SYMBOL(netdev_lower_state_changed); | |
8598 | ||
b6c40d68 PM |
8599 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
8600 | { | |
d314774c SH |
8601 | const struct net_device_ops *ops = dev->netdev_ops; |
8602 | ||
d2615bf4 | 8603 | if (ops->ndo_change_rx_flags) |
d314774c | 8604 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
8605 | } |
8606 | ||
991fb3f7 | 8607 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 8608 | { |
b536db93 | 8609 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
8610 | kuid_t uid; |
8611 | kgid_t gid; | |
1da177e4 | 8612 | |
24023451 PM |
8613 | ASSERT_RTNL(); |
8614 | ||
dad9b335 WC |
8615 | dev->flags |= IFF_PROMISC; |
8616 | dev->promiscuity += inc; | |
8617 | if (dev->promiscuity == 0) { | |
8618 | /* | |
8619 | * Avoid overflow. | |
8620 | * If inc causes overflow, untouch promisc and return error. | |
8621 | */ | |
8622 | if (inc < 0) | |
8623 | dev->flags &= ~IFF_PROMISC; | |
8624 | else { | |
8625 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
8626 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
8627 | dev->name); | |
dad9b335 WC |
8628 | return -EOVERFLOW; |
8629 | } | |
8630 | } | |
52609c0b | 8631 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
8632 | pr_info("device %s %s promiscuous mode\n", |
8633 | dev->name, | |
8634 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
8635 | if (audit_enabled) { |
8636 | current_uid_gid(&uid, &gid); | |
cdfb6b34 RGB |
8637 | audit_log(audit_context(), GFP_ATOMIC, |
8638 | AUDIT_ANOM_PROMISCUOUS, | |
8639 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
8640 | dev->name, (dev->flags & IFF_PROMISC), | |
8641 | (old_flags & IFF_PROMISC), | |
8642 | from_kuid(&init_user_ns, audit_get_loginuid(current)), | |
8643 | from_kuid(&init_user_ns, uid), | |
8644 | from_kgid(&init_user_ns, gid), | |
8645 | audit_get_sessionid(current)); | |
8192b0c4 | 8646 | } |
24023451 | 8647 | |
b6c40d68 | 8648 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 8649 | } |
991fb3f7 ND |
8650 | if (notify) |
8651 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 8652 | return 0; |
1da177e4 LT |
8653 | } |
8654 | ||
4417da66 PM |
8655 | /** |
8656 | * dev_set_promiscuity - update promiscuity count on a device | |
8657 | * @dev: device | |
8658 | * @inc: modifier | |
8659 | * | |
8660 | * Add or remove promiscuity from a device. While the count in the device | |
8661 | * remains above zero the interface remains promiscuous. Once it hits zero | |
8662 | * the device reverts back to normal filtering operation. A negative inc | |
8663 | * value is used to drop promiscuity on the device. | |
dad9b335 | 8664 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 8665 | */ |
dad9b335 | 8666 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 8667 | { |
b536db93 | 8668 | unsigned int old_flags = dev->flags; |
dad9b335 | 8669 | int err; |
4417da66 | 8670 | |
991fb3f7 | 8671 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 8672 | if (err < 0) |
dad9b335 | 8673 | return err; |
4417da66 PM |
8674 | if (dev->flags != old_flags) |
8675 | dev_set_rx_mode(dev); | |
dad9b335 | 8676 | return err; |
4417da66 | 8677 | } |
d1b19dff | 8678 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 8679 | |
991fb3f7 | 8680 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 8681 | { |
991fb3f7 | 8682 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 8683 | |
24023451 PM |
8684 | ASSERT_RTNL(); |
8685 | ||
1da177e4 | 8686 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
8687 | dev->allmulti += inc; |
8688 | if (dev->allmulti == 0) { | |
8689 | /* | |
8690 | * Avoid overflow. | |
8691 | * If inc causes overflow, untouch allmulti and return error. | |
8692 | */ | |
8693 | if (inc < 0) | |
8694 | dev->flags &= ~IFF_ALLMULTI; | |
8695 | else { | |
8696 | dev->allmulti -= inc; | |
7b6cd1ce JP |
8697 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
8698 | dev->name); | |
dad9b335 WC |
8699 | return -EOVERFLOW; |
8700 | } | |
8701 | } | |
24023451 | 8702 | if (dev->flags ^ old_flags) { |
b6c40d68 | 8703 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 8704 | dev_set_rx_mode(dev); |
991fb3f7 ND |
8705 | if (notify) |
8706 | __dev_notify_flags(dev, old_flags, | |
8707 | dev->gflags ^ old_gflags); | |
24023451 | 8708 | } |
dad9b335 | 8709 | return 0; |
4417da66 | 8710 | } |
991fb3f7 ND |
8711 | |
8712 | /** | |
8713 | * dev_set_allmulti - update allmulti count on a device | |
8714 | * @dev: device | |
8715 | * @inc: modifier | |
8716 | * | |
8717 | * Add or remove reception of all multicast frames to a device. While the | |
8718 | * count in the device remains above zero the interface remains listening | |
8719 | * to all interfaces. Once it hits zero the device reverts back to normal | |
8720 | * filtering operation. A negative @inc value is used to drop the counter | |
8721 | * when releasing a resource needing all multicasts. | |
8722 | * Return 0 if successful or a negative errno code on error. | |
8723 | */ | |
8724 | ||
8725 | int dev_set_allmulti(struct net_device *dev, int inc) | |
8726 | { | |
8727 | return __dev_set_allmulti(dev, inc, true); | |
8728 | } | |
d1b19dff | 8729 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
8730 | |
8731 | /* | |
8732 | * Upload unicast and multicast address lists to device and | |
8733 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 8734 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
8735 | * are present. |
8736 | */ | |
8737 | void __dev_set_rx_mode(struct net_device *dev) | |
8738 | { | |
d314774c SH |
8739 | const struct net_device_ops *ops = dev->netdev_ops; |
8740 | ||
4417da66 PM |
8741 | /* dev_open will call this function so the list will stay sane. */ |
8742 | if (!(dev->flags&IFF_UP)) | |
8743 | return; | |
8744 | ||
8745 | if (!netif_device_present(dev)) | |
40b77c94 | 8746 | return; |
4417da66 | 8747 | |
01789349 | 8748 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
8749 | /* Unicast addresses changes may only happen under the rtnl, |
8750 | * therefore calling __dev_set_promiscuity here is safe. | |
8751 | */ | |
32e7bfc4 | 8752 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 8753 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 8754 | dev->uc_promisc = true; |
32e7bfc4 | 8755 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 8756 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 8757 | dev->uc_promisc = false; |
4417da66 | 8758 | } |
4417da66 | 8759 | } |
01789349 JP |
8760 | |
8761 | if (ops->ndo_set_rx_mode) | |
8762 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
8763 | } |
8764 | ||
8765 | void dev_set_rx_mode(struct net_device *dev) | |
8766 | { | |
b9e40857 | 8767 | netif_addr_lock_bh(dev); |
4417da66 | 8768 | __dev_set_rx_mode(dev); |
b9e40857 | 8769 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
8770 | } |
8771 | ||
f0db275a SH |
8772 | /** |
8773 | * dev_get_flags - get flags reported to userspace | |
8774 | * @dev: device | |
8775 | * | |
8776 | * Get the combination of flag bits exported through APIs to userspace. | |
8777 | */ | |
95c96174 | 8778 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 8779 | { |
95c96174 | 8780 | unsigned int flags; |
1da177e4 LT |
8781 | |
8782 | flags = (dev->flags & ~(IFF_PROMISC | | |
8783 | IFF_ALLMULTI | | |
b00055aa SR |
8784 | IFF_RUNNING | |
8785 | IFF_LOWER_UP | | |
8786 | IFF_DORMANT)) | | |
1da177e4 LT |
8787 | (dev->gflags & (IFF_PROMISC | |
8788 | IFF_ALLMULTI)); | |
8789 | ||
b00055aa SR |
8790 | if (netif_running(dev)) { |
8791 | if (netif_oper_up(dev)) | |
8792 | flags |= IFF_RUNNING; | |
8793 | if (netif_carrier_ok(dev)) | |
8794 | flags |= IFF_LOWER_UP; | |
8795 | if (netif_dormant(dev)) | |
8796 | flags |= IFF_DORMANT; | |
8797 | } | |
1da177e4 LT |
8798 | |
8799 | return flags; | |
8800 | } | |
d1b19dff | 8801 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 8802 | |
6d040321 PM |
8803 | int __dev_change_flags(struct net_device *dev, unsigned int flags, |
8804 | struct netlink_ext_ack *extack) | |
1da177e4 | 8805 | { |
b536db93 | 8806 | unsigned int old_flags = dev->flags; |
bd380811 | 8807 | int ret; |
1da177e4 | 8808 | |
24023451 PM |
8809 | ASSERT_RTNL(); |
8810 | ||
1da177e4 LT |
8811 | /* |
8812 | * Set the flags on our device. | |
8813 | */ | |
8814 | ||
8815 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
8816 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
8817 | IFF_AUTOMEDIA)) | | |
8818 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
8819 | IFF_ALLMULTI)); | |
8820 | ||
8821 | /* | |
8822 | * Load in the correct multicast list now the flags have changed. | |
8823 | */ | |
8824 | ||
b6c40d68 PM |
8825 | if ((old_flags ^ flags) & IFF_MULTICAST) |
8826 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 8827 | |
4417da66 | 8828 | dev_set_rx_mode(dev); |
1da177e4 LT |
8829 | |
8830 | /* | |
8831 | * Have we downed the interface. We handle IFF_UP ourselves | |
8832 | * according to user attempts to set it, rather than blindly | |
8833 | * setting it. | |
8834 | */ | |
8835 | ||
8836 | ret = 0; | |
7051b88a | 8837 | if ((old_flags ^ flags) & IFF_UP) { |
8838 | if (old_flags & IFF_UP) | |
8839 | __dev_close(dev); | |
8840 | else | |
40c900aa | 8841 | ret = __dev_open(dev, extack); |
7051b88a | 8842 | } |
1da177e4 | 8843 | |
1da177e4 | 8844 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 8845 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 8846 | unsigned int old_flags = dev->flags; |
d1b19dff | 8847 | |
1da177e4 | 8848 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
8849 | |
8850 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
8851 | if (dev->flags != old_flags) | |
8852 | dev_set_rx_mode(dev); | |
1da177e4 LT |
8853 | } |
8854 | ||
8855 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
eb13da1a | 8856 | * is important. Some (broken) drivers set IFF_PROMISC, when |
8857 | * IFF_ALLMULTI is requested not asking us and not reporting. | |
1da177e4 LT |
8858 | */ |
8859 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
8860 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
8861 | ||
1da177e4 | 8862 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 8863 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
8864 | } |
8865 | ||
bd380811 PM |
8866 | return ret; |
8867 | } | |
8868 | ||
a528c219 ND |
8869 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
8870 | unsigned int gchanges) | |
bd380811 PM |
8871 | { |
8872 | unsigned int changes = dev->flags ^ old_flags; | |
8873 | ||
a528c219 | 8874 | if (gchanges) |
7f294054 | 8875 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 8876 | |
bd380811 PM |
8877 | if (changes & IFF_UP) { |
8878 | if (dev->flags & IFF_UP) | |
8879 | call_netdevice_notifiers(NETDEV_UP, dev); | |
8880 | else | |
8881 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
8882 | } | |
8883 | ||
8884 | if (dev->flags & IFF_UP && | |
be9efd36 | 8885 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
51d0c047 DA |
8886 | struct netdev_notifier_change_info change_info = { |
8887 | .info = { | |
8888 | .dev = dev, | |
8889 | }, | |
8890 | .flags_changed = changes, | |
8891 | }; | |
be9efd36 | 8892 | |
51d0c047 | 8893 | call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); |
be9efd36 | 8894 | } |
bd380811 PM |
8895 | } |
8896 | ||
8897 | /** | |
8898 | * dev_change_flags - change device settings | |
8899 | * @dev: device | |
8900 | * @flags: device state flags | |
567c5e13 | 8901 | * @extack: netlink extended ack |
bd380811 PM |
8902 | * |
8903 | * Change settings on device based state flags. The flags are | |
8904 | * in the userspace exported format. | |
8905 | */ | |
567c5e13 PM |
8906 | int dev_change_flags(struct net_device *dev, unsigned int flags, |
8907 | struct netlink_ext_ack *extack) | |
bd380811 | 8908 | { |
b536db93 | 8909 | int ret; |
991fb3f7 | 8910 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 | 8911 | |
6d040321 | 8912 | ret = __dev_change_flags(dev, flags, extack); |
bd380811 PM |
8913 | if (ret < 0) |
8914 | return ret; | |
8915 | ||
991fb3f7 | 8916 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 8917 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
8918 | return ret; |
8919 | } | |
d1b19dff | 8920 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 8921 | |
f51048c3 | 8922 | int __dev_set_mtu(struct net_device *dev, int new_mtu) |
2315dc91 VF |
8923 | { |
8924 | const struct net_device_ops *ops = dev->netdev_ops; | |
8925 | ||
8926 | if (ops->ndo_change_mtu) | |
8927 | return ops->ndo_change_mtu(dev, new_mtu); | |
8928 | ||
501a90c9 ED |
8929 | /* Pairs with all the lockless reads of dev->mtu in the stack */ |
8930 | WRITE_ONCE(dev->mtu, new_mtu); | |
2315dc91 VF |
8931 | return 0; |
8932 | } | |
f51048c3 | 8933 | EXPORT_SYMBOL(__dev_set_mtu); |
2315dc91 | 8934 | |
d836f5c6 ED |
8935 | int dev_validate_mtu(struct net_device *dev, int new_mtu, |
8936 | struct netlink_ext_ack *extack) | |
8937 | { | |
8938 | /* MTU must be positive, and in range */ | |
8939 | if (new_mtu < 0 || new_mtu < dev->min_mtu) { | |
8940 | NL_SET_ERR_MSG(extack, "mtu less than device minimum"); | |
8941 | return -EINVAL; | |
8942 | } | |
8943 | ||
8944 | if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { | |
8945 | NL_SET_ERR_MSG(extack, "mtu greater than device maximum"); | |
8946 | return -EINVAL; | |
8947 | } | |
8948 | return 0; | |
8949 | } | |
8950 | ||
f0db275a | 8951 | /** |
7a4c53be | 8952 | * dev_set_mtu_ext - Change maximum transfer unit |
f0db275a SH |
8953 | * @dev: device |
8954 | * @new_mtu: new transfer unit | |
7a4c53be | 8955 | * @extack: netlink extended ack |
f0db275a SH |
8956 | * |
8957 | * Change the maximum transfer size of the network device. | |
8958 | */ | |
7a4c53be SH |
8959 | int dev_set_mtu_ext(struct net_device *dev, int new_mtu, |
8960 | struct netlink_ext_ack *extack) | |
1da177e4 | 8961 | { |
2315dc91 | 8962 | int err, orig_mtu; |
1da177e4 LT |
8963 | |
8964 | if (new_mtu == dev->mtu) | |
8965 | return 0; | |
8966 | ||
d836f5c6 ED |
8967 | err = dev_validate_mtu(dev, new_mtu, extack); |
8968 | if (err) | |
8969 | return err; | |
1da177e4 LT |
8970 | |
8971 | if (!netif_device_present(dev)) | |
8972 | return -ENODEV; | |
8973 | ||
1d486bfb VF |
8974 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
8975 | err = notifier_to_errno(err); | |
8976 | if (err) | |
8977 | return err; | |
d314774c | 8978 | |
2315dc91 VF |
8979 | orig_mtu = dev->mtu; |
8980 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 8981 | |
2315dc91 | 8982 | if (!err) { |
af7d6cce SD |
8983 | err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8984 | orig_mtu); | |
2315dc91 VF |
8985 | err = notifier_to_errno(err); |
8986 | if (err) { | |
8987 | /* setting mtu back and notifying everyone again, | |
8988 | * so that they have a chance to revert changes. | |
8989 | */ | |
8990 | __dev_set_mtu(dev, orig_mtu); | |
af7d6cce SD |
8991 | call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8992 | new_mtu); | |
2315dc91 VF |
8993 | } |
8994 | } | |
1da177e4 LT |
8995 | return err; |
8996 | } | |
7a4c53be SH |
8997 | |
8998 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
8999 | { | |
9000 | struct netlink_ext_ack extack; | |
9001 | int err; | |
9002 | ||
a6bcfc89 | 9003 | memset(&extack, 0, sizeof(extack)); |
7a4c53be | 9004 | err = dev_set_mtu_ext(dev, new_mtu, &extack); |
a6bcfc89 | 9005 | if (err && extack._msg) |
7a4c53be SH |
9006 | net_err_ratelimited("%s: %s\n", dev->name, extack._msg); |
9007 | return err; | |
9008 | } | |
d1b19dff | 9009 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 9010 | |
6a643ddb CW |
9011 | /** |
9012 | * dev_change_tx_queue_len - Change TX queue length of a netdevice | |
9013 | * @dev: device | |
9014 | * @new_len: new tx queue length | |
9015 | */ | |
9016 | int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len) | |
9017 | { | |
9018 | unsigned int orig_len = dev->tx_queue_len; | |
9019 | int res; | |
9020 | ||
9021 | if (new_len != (unsigned int)new_len) | |
9022 | return -ERANGE; | |
9023 | ||
9024 | if (new_len != orig_len) { | |
9025 | dev->tx_queue_len = new_len; | |
9026 | res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); | |
9027 | res = notifier_to_errno(res); | |
7effaf06 TT |
9028 | if (res) |
9029 | goto err_rollback; | |
9030 | res = dev_qdisc_change_tx_queue_len(dev); | |
9031 | if (res) | |
9032 | goto err_rollback; | |
6a643ddb CW |
9033 | } |
9034 | ||
9035 | return 0; | |
7effaf06 TT |
9036 | |
9037 | err_rollback: | |
9038 | netdev_err(dev, "refused to change device tx_queue_len\n"); | |
9039 | dev->tx_queue_len = orig_len; | |
9040 | return res; | |
6a643ddb CW |
9041 | } |
9042 | ||
cbda10fa VD |
9043 | /** |
9044 | * dev_set_group - Change group this device belongs to | |
9045 | * @dev: device | |
9046 | * @new_group: group this device should belong to | |
9047 | */ | |
9048 | void dev_set_group(struct net_device *dev, int new_group) | |
9049 | { | |
9050 | dev->group = new_group; | |
9051 | } | |
9052 | EXPORT_SYMBOL(dev_set_group); | |
9053 | ||
d59cdf94 PM |
9054 | /** |
9055 | * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR. | |
9056 | * @dev: device | |
9057 | * @addr: new address | |
9058 | * @extack: netlink extended ack | |
9059 | */ | |
9060 | int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, | |
9061 | struct netlink_ext_ack *extack) | |
9062 | { | |
9063 | struct netdev_notifier_pre_changeaddr_info info = { | |
9064 | .info.dev = dev, | |
9065 | .info.extack = extack, | |
9066 | .dev_addr = addr, | |
9067 | }; | |
9068 | int rc; | |
9069 | ||
9070 | rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info); | |
9071 | return notifier_to_errno(rc); | |
9072 | } | |
9073 | EXPORT_SYMBOL(dev_pre_changeaddr_notify); | |
9074 | ||
f0db275a SH |
9075 | /** |
9076 | * dev_set_mac_address - Change Media Access Control Address | |
9077 | * @dev: device | |
9078 | * @sa: new address | |
3a37a963 | 9079 | * @extack: netlink extended ack |
f0db275a SH |
9080 | * |
9081 | * Change the hardware (MAC) address of the device | |
9082 | */ | |
3a37a963 PM |
9083 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, |
9084 | struct netlink_ext_ack *extack) | |
1da177e4 | 9085 | { |
d314774c | 9086 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
9087 | int err; |
9088 | ||
d314774c | 9089 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
9090 | return -EOPNOTSUPP; |
9091 | if (sa->sa_family != dev->type) | |
9092 | return -EINVAL; | |
9093 | if (!netif_device_present(dev)) | |
9094 | return -ENODEV; | |
d59cdf94 PM |
9095 | err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack); |
9096 | if (err) | |
9097 | return err; | |
d314774c | 9098 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
9099 | if (err) |
9100 | return err; | |
fbdeca2d | 9101 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 9102 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 9103 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 9104 | return 0; |
1da177e4 | 9105 | } |
d1b19dff | 9106 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 9107 | |
3b23a32a CW |
9108 | static DECLARE_RWSEM(dev_addr_sem); |
9109 | ||
9110 | int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, | |
9111 | struct netlink_ext_ack *extack) | |
9112 | { | |
9113 | int ret; | |
9114 | ||
9115 | down_write(&dev_addr_sem); | |
9116 | ret = dev_set_mac_address(dev, sa, extack); | |
9117 | up_write(&dev_addr_sem); | |
9118 | return ret; | |
9119 | } | |
9120 | EXPORT_SYMBOL(dev_set_mac_address_user); | |
9121 | ||
9122 | int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name) | |
9123 | { | |
9124 | size_t size = sizeof(sa->sa_data); | |
9125 | struct net_device *dev; | |
9126 | int ret = 0; | |
9127 | ||
9128 | down_read(&dev_addr_sem); | |
9129 | rcu_read_lock(); | |
9130 | ||
9131 | dev = dev_get_by_name_rcu(net, dev_name); | |
9132 | if (!dev) { | |
9133 | ret = -ENODEV; | |
9134 | goto unlock; | |
9135 | } | |
9136 | if (!dev->addr_len) | |
9137 | memset(sa->sa_data, 0, size); | |
9138 | else | |
9139 | memcpy(sa->sa_data, dev->dev_addr, | |
9140 | min_t(size_t, size, dev->addr_len)); | |
9141 | sa->sa_family = dev->type; | |
9142 | ||
9143 | unlock: | |
9144 | rcu_read_unlock(); | |
9145 | up_read(&dev_addr_sem); | |
9146 | return ret; | |
9147 | } | |
9148 | EXPORT_SYMBOL(dev_get_mac_address); | |
9149 | ||
4bf84c35 JP |
9150 | /** |
9151 | * dev_change_carrier - Change device carrier | |
9152 | * @dev: device | |
691b3b7e | 9153 | * @new_carrier: new value |
4bf84c35 JP |
9154 | * |
9155 | * Change device carrier | |
9156 | */ | |
9157 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
9158 | { | |
9159 | const struct net_device_ops *ops = dev->netdev_ops; | |
9160 | ||
9161 | if (!ops->ndo_change_carrier) | |
9162 | return -EOPNOTSUPP; | |
9163 | if (!netif_device_present(dev)) | |
9164 | return -ENODEV; | |
9165 | return ops->ndo_change_carrier(dev, new_carrier); | |
9166 | } | |
9167 | EXPORT_SYMBOL(dev_change_carrier); | |
9168 | ||
66b52b0d JP |
9169 | /** |
9170 | * dev_get_phys_port_id - Get device physical port ID | |
9171 | * @dev: device | |
9172 | * @ppid: port ID | |
9173 | * | |
9174 | * Get device physical port ID | |
9175 | */ | |
9176 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 9177 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
9178 | { |
9179 | const struct net_device_ops *ops = dev->netdev_ops; | |
9180 | ||
9181 | if (!ops->ndo_get_phys_port_id) | |
9182 | return -EOPNOTSUPP; | |
9183 | return ops->ndo_get_phys_port_id(dev, ppid); | |
9184 | } | |
9185 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
9186 | ||
db24a904 DA |
9187 | /** |
9188 | * dev_get_phys_port_name - Get device physical port name | |
9189 | * @dev: device | |
9190 | * @name: port name | |
ed49e650 | 9191 | * @len: limit of bytes to copy to name |
db24a904 DA |
9192 | * |
9193 | * Get device physical port name | |
9194 | */ | |
9195 | int dev_get_phys_port_name(struct net_device *dev, | |
9196 | char *name, size_t len) | |
9197 | { | |
9198 | const struct net_device_ops *ops = dev->netdev_ops; | |
af3836df | 9199 | int err; |
db24a904 | 9200 | |
af3836df JP |
9201 | if (ops->ndo_get_phys_port_name) { |
9202 | err = ops->ndo_get_phys_port_name(dev, name, len); | |
9203 | if (err != -EOPNOTSUPP) | |
9204 | return err; | |
9205 | } | |
9206 | return devlink_compat_phys_port_name_get(dev, name, len); | |
db24a904 DA |
9207 | } |
9208 | EXPORT_SYMBOL(dev_get_phys_port_name); | |
9209 | ||
d6abc596 FF |
9210 | /** |
9211 | * dev_get_port_parent_id - Get the device's port parent identifier | |
9212 | * @dev: network device | |
9213 | * @ppid: pointer to a storage for the port's parent identifier | |
9214 | * @recurse: allow/disallow recursion to lower devices | |
9215 | * | |
9216 | * Get the devices's port parent identifier | |
9217 | */ | |
9218 | int dev_get_port_parent_id(struct net_device *dev, | |
9219 | struct netdev_phys_item_id *ppid, | |
9220 | bool recurse) | |
9221 | { | |
9222 | const struct net_device_ops *ops = dev->netdev_ops; | |
9223 | struct netdev_phys_item_id first = { }; | |
9224 | struct net_device *lower_dev; | |
9225 | struct list_head *iter; | |
7e1146e8 JP |
9226 | int err; |
9227 | ||
9228 | if (ops->ndo_get_port_parent_id) { | |
9229 | err = ops->ndo_get_port_parent_id(dev, ppid); | |
9230 | if (err != -EOPNOTSUPP) | |
9231 | return err; | |
9232 | } | |
d6abc596 | 9233 | |
7e1146e8 JP |
9234 | err = devlink_compat_switch_id_get(dev, ppid); |
9235 | if (!err || err != -EOPNOTSUPP) | |
9236 | return err; | |
d6abc596 FF |
9237 | |
9238 | if (!recurse) | |
7e1146e8 | 9239 | return -EOPNOTSUPP; |
d6abc596 FF |
9240 | |
9241 | netdev_for_each_lower_dev(dev, lower_dev, iter) { | |
9242 | err = dev_get_port_parent_id(lower_dev, ppid, recurse); | |
9243 | if (err) | |
9244 | break; | |
9245 | if (!first.id_len) | |
9246 | first = *ppid; | |
9247 | else if (memcmp(&first, ppid, sizeof(*ppid))) | |
e1b9efe6 | 9248 | return -EOPNOTSUPP; |
d6abc596 FF |
9249 | } |
9250 | ||
9251 | return err; | |
9252 | } | |
9253 | EXPORT_SYMBOL(dev_get_port_parent_id); | |
9254 | ||
9255 | /** | |
9256 | * netdev_port_same_parent_id - Indicate if two network devices have | |
9257 | * the same port parent identifier | |
9258 | * @a: first network device | |
9259 | * @b: second network device | |
9260 | */ | |
9261 | bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b) | |
9262 | { | |
9263 | struct netdev_phys_item_id a_id = { }; | |
9264 | struct netdev_phys_item_id b_id = { }; | |
9265 | ||
9266 | if (dev_get_port_parent_id(a, &a_id, true) || | |
9267 | dev_get_port_parent_id(b, &b_id, true)) | |
9268 | return false; | |
9269 | ||
9270 | return netdev_phys_item_id_same(&a_id, &b_id); | |
9271 | } | |
9272 | EXPORT_SYMBOL(netdev_port_same_parent_id); | |
9273 | ||
d746d707 AK |
9274 | /** |
9275 | * dev_change_proto_down - update protocol port state information | |
9276 | * @dev: device | |
9277 | * @proto_down: new value | |
9278 | * | |
9279 | * This info can be used by switch drivers to set the phys state of the | |
9280 | * port. | |
9281 | */ | |
9282 | int dev_change_proto_down(struct net_device *dev, bool proto_down) | |
9283 | { | |
9284 | const struct net_device_ops *ops = dev->netdev_ops; | |
9285 | ||
9286 | if (!ops->ndo_change_proto_down) | |
9287 | return -EOPNOTSUPP; | |
9288 | if (!netif_device_present(dev)) | |
9289 | return -ENODEV; | |
9290 | return ops->ndo_change_proto_down(dev, proto_down); | |
9291 | } | |
9292 | EXPORT_SYMBOL(dev_change_proto_down); | |
9293 | ||
b5899679 AR |
9294 | /** |
9295 | * dev_change_proto_down_generic - generic implementation for | |
9296 | * ndo_change_proto_down that sets carrier according to | |
9297 | * proto_down. | |
9298 | * | |
9299 | * @dev: device | |
9300 | * @proto_down: new value | |
9301 | */ | |
9302 | int dev_change_proto_down_generic(struct net_device *dev, bool proto_down) | |
9303 | { | |
9304 | if (proto_down) | |
9305 | netif_carrier_off(dev); | |
9306 | else | |
9307 | netif_carrier_on(dev); | |
9308 | dev->proto_down = proto_down; | |
9309 | return 0; | |
9310 | } | |
9311 | EXPORT_SYMBOL(dev_change_proto_down_generic); | |
9312 | ||
829eb208 RP |
9313 | /** |
9314 | * dev_change_proto_down_reason - proto down reason | |
9315 | * | |
9316 | * @dev: device | |
9317 | * @mask: proto down mask | |
9318 | * @value: proto down value | |
9319 | */ | |
9320 | void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask, | |
9321 | u32 value) | |
9322 | { | |
9323 | int b; | |
9324 | ||
9325 | if (!mask) { | |
9326 | dev->proto_down_reason = value; | |
9327 | } else { | |
9328 | for_each_set_bit(b, &mask, 32) { | |
9329 | if (value & (1 << b)) | |
9330 | dev->proto_down_reason |= BIT(b); | |
9331 | else | |
9332 | dev->proto_down_reason &= ~BIT(b); | |
9333 | } | |
9334 | } | |
9335 | } | |
9336 | EXPORT_SYMBOL(dev_change_proto_down_reason); | |
9337 | ||
aa8d3a71 AN |
9338 | struct bpf_xdp_link { |
9339 | struct bpf_link link; | |
9340 | struct net_device *dev; /* protected by rtnl_lock, no refcnt held */ | |
9341 | int flags; | |
9342 | }; | |
9343 | ||
c8a36f19 | 9344 | static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags) |
d67b9cd2 | 9345 | { |
7f0a8382 AN |
9346 | if (flags & XDP_FLAGS_HW_MODE) |
9347 | return XDP_MODE_HW; | |
9348 | if (flags & XDP_FLAGS_DRV_MODE) | |
9349 | return XDP_MODE_DRV; | |
c8a36f19 AN |
9350 | if (flags & XDP_FLAGS_SKB_MODE) |
9351 | return XDP_MODE_SKB; | |
9352 | return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB; | |
7f0a8382 | 9353 | } |
d67b9cd2 | 9354 | |
7f0a8382 AN |
9355 | static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode) |
9356 | { | |
9357 | switch (mode) { | |
9358 | case XDP_MODE_SKB: | |
9359 | return generic_xdp_install; | |
9360 | case XDP_MODE_DRV: | |
9361 | case XDP_MODE_HW: | |
9362 | return dev->netdev_ops->ndo_bpf; | |
9363 | default: | |
9364 | return NULL; | |
5d867245 | 9365 | } |
7f0a8382 | 9366 | } |
118b4aa2 | 9367 | |
aa8d3a71 AN |
9368 | static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev, |
9369 | enum bpf_xdp_mode mode) | |
9370 | { | |
9371 | return dev->xdp_state[mode].link; | |
9372 | } | |
9373 | ||
7f0a8382 AN |
9374 | static struct bpf_prog *dev_xdp_prog(struct net_device *dev, |
9375 | enum bpf_xdp_mode mode) | |
9376 | { | |
aa8d3a71 AN |
9377 | struct bpf_xdp_link *link = dev_xdp_link(dev, mode); |
9378 | ||
9379 | if (link) | |
9380 | return link->link.prog; | |
7f0a8382 AN |
9381 | return dev->xdp_state[mode].prog; |
9382 | } | |
9383 | ||
998f1729 THJ |
9384 | static u8 dev_xdp_prog_count(struct net_device *dev) |
9385 | { | |
9386 | u8 count = 0; | |
9387 | int i; | |
9388 | ||
9389 | for (i = 0; i < __MAX_XDP_MODE; i++) | |
9390 | if (dev->xdp_state[i].prog || dev->xdp_state[i].link) | |
9391 | count++; | |
9392 | return count; | |
9393 | } | |
9394 | ||
7f0a8382 AN |
9395 | u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode) |
9396 | { | |
9397 | struct bpf_prog *prog = dev_xdp_prog(dev, mode); | |
118b4aa2 | 9398 | |
7f0a8382 AN |
9399 | return prog ? prog->aux->id : 0; |
9400 | } | |
58038695 | 9401 | |
aa8d3a71 AN |
9402 | static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode, |
9403 | struct bpf_xdp_link *link) | |
9404 | { | |
9405 | dev->xdp_state[mode].link = link; | |
9406 | dev->xdp_state[mode].prog = NULL; | |
d67b9cd2 DB |
9407 | } |
9408 | ||
7f0a8382 AN |
9409 | static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode, |
9410 | struct bpf_prog *prog) | |
9411 | { | |
aa8d3a71 | 9412 | dev->xdp_state[mode].link = NULL; |
7f0a8382 | 9413 | dev->xdp_state[mode].prog = prog; |
d67b9cd2 DB |
9414 | } |
9415 | ||
7f0a8382 AN |
9416 | static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode, |
9417 | bpf_op_t bpf_op, struct netlink_ext_ack *extack, | |
9418 | u32 flags, struct bpf_prog *prog) | |
d67b9cd2 | 9419 | { |
f4e63525 | 9420 | struct netdev_bpf xdp; |
7e6897f9 BT |
9421 | int err; |
9422 | ||
d67b9cd2 | 9423 | memset(&xdp, 0, sizeof(xdp)); |
7f0a8382 | 9424 | xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG; |
d67b9cd2 | 9425 | xdp.extack = extack; |
32d60277 | 9426 | xdp.flags = flags; |
d67b9cd2 DB |
9427 | xdp.prog = prog; |
9428 | ||
7f0a8382 AN |
9429 | /* Drivers assume refcnt is already incremented (i.e, prog pointer is |
9430 | * "moved" into driver), so they don't increment it on their own, but | |
9431 | * they do decrement refcnt when program is detached or replaced. | |
9432 | * Given net_device also owns link/prog, we need to bump refcnt here | |
9433 | * to prevent drivers from underflowing it. | |
9434 | */ | |
9435 | if (prog) | |
9436 | bpf_prog_inc(prog); | |
7e6897f9 | 9437 | err = bpf_op(dev, &xdp); |
7f0a8382 AN |
9438 | if (err) { |
9439 | if (prog) | |
9440 | bpf_prog_put(prog); | |
9441 | return err; | |
9442 | } | |
7e6897f9 | 9443 | |
7f0a8382 AN |
9444 | if (mode != XDP_MODE_HW) |
9445 | bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog); | |
7e6897f9 | 9446 | |
7f0a8382 | 9447 | return 0; |
d67b9cd2 DB |
9448 | } |
9449 | ||
bd0b2e7f JK |
9450 | static void dev_xdp_uninstall(struct net_device *dev) |
9451 | { | |
aa8d3a71 | 9452 | struct bpf_xdp_link *link; |
7f0a8382 AN |
9453 | struct bpf_prog *prog; |
9454 | enum bpf_xdp_mode mode; | |
9455 | bpf_op_t bpf_op; | |
bd0b2e7f | 9456 | |
7f0a8382 | 9457 | ASSERT_RTNL(); |
bd0b2e7f | 9458 | |
7f0a8382 AN |
9459 | for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) { |
9460 | prog = dev_xdp_prog(dev, mode); | |
9461 | if (!prog) | |
9462 | continue; | |
bd0b2e7f | 9463 | |
7f0a8382 AN |
9464 | bpf_op = dev_xdp_bpf_op(dev, mode); |
9465 | if (!bpf_op) | |
9466 | continue; | |
bd0b2e7f | 9467 | |
7f0a8382 AN |
9468 | WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); |
9469 | ||
aa8d3a71 AN |
9470 | /* auto-detach link from net device */ |
9471 | link = dev_xdp_link(dev, mode); | |
9472 | if (link) | |
9473 | link->dev = NULL; | |
9474 | else | |
9475 | bpf_prog_put(prog); | |
9476 | ||
9477 | dev_xdp_set_link(dev, mode, NULL); | |
7f0a8382 | 9478 | } |
bd0b2e7f JK |
9479 | } |
9480 | ||
d4baa936 | 9481 | static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack, |
aa8d3a71 AN |
9482 | struct bpf_xdp_link *link, struct bpf_prog *new_prog, |
9483 | struct bpf_prog *old_prog, u32 flags) | |
a7862b45 | 9484 | { |
998f1729 | 9485 | unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES); |
d4baa936 AN |
9486 | struct bpf_prog *cur_prog; |
9487 | enum bpf_xdp_mode mode; | |
7f0a8382 | 9488 | bpf_op_t bpf_op; |
a7862b45 BB |
9489 | int err; |
9490 | ||
85de8576 DB |
9491 | ASSERT_RTNL(); |
9492 | ||
aa8d3a71 AN |
9493 | /* either link or prog attachment, never both */ |
9494 | if (link && (new_prog || old_prog)) | |
9495 | return -EINVAL; | |
9496 | /* link supports only XDP mode flags */ | |
9497 | if (link && (flags & ~XDP_FLAGS_MODES)) { | |
9498 | NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment"); | |
9499 | return -EINVAL; | |
9500 | } | |
998f1729 THJ |
9501 | /* just one XDP mode bit should be set, zero defaults to drv/skb mode */ |
9502 | if (num_modes > 1) { | |
d4baa936 AN |
9503 | NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set"); |
9504 | return -EINVAL; | |
9505 | } | |
998f1729 THJ |
9506 | /* avoid ambiguity if offload + drv/skb mode progs are both loaded */ |
9507 | if (!num_modes && dev_xdp_prog_count(dev) > 1) { | |
9508 | NL_SET_ERR_MSG(extack, | |
9509 | "More than one program loaded, unset mode is ambiguous"); | |
9510 | return -EINVAL; | |
9511 | } | |
d4baa936 AN |
9512 | /* old_prog != NULL implies XDP_FLAGS_REPLACE is set */ |
9513 | if (old_prog && !(flags & XDP_FLAGS_REPLACE)) { | |
9514 | NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified"); | |
9515 | return -EINVAL; | |
01dde20c | 9516 | } |
a25717d2 | 9517 | |
c8a36f19 | 9518 | mode = dev_xdp_mode(dev, flags); |
aa8d3a71 AN |
9519 | /* can't replace attached link */ |
9520 | if (dev_xdp_link(dev, mode)) { | |
9521 | NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link"); | |
9522 | return -EBUSY; | |
01dde20c | 9523 | } |
c14a9f63 | 9524 | |
d4baa936 | 9525 | cur_prog = dev_xdp_prog(dev, mode); |
aa8d3a71 AN |
9526 | /* can't replace attached prog with link */ |
9527 | if (link && cur_prog) { | |
9528 | NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link"); | |
9529 | return -EBUSY; | |
9530 | } | |
d4baa936 AN |
9531 | if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) { |
9532 | NL_SET_ERR_MSG(extack, "Active program does not match expected"); | |
9533 | return -EEXIST; | |
92234c8f | 9534 | } |
c14a9f63 | 9535 | |
aa8d3a71 AN |
9536 | /* put effective new program into new_prog */ |
9537 | if (link) | |
9538 | new_prog = link->link.prog; | |
85de8576 | 9539 | |
d4baa936 AN |
9540 | if (new_prog) { |
9541 | bool offload = mode == XDP_MODE_HW; | |
7f0a8382 AN |
9542 | enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB |
9543 | ? XDP_MODE_DRV : XDP_MODE_SKB; | |
441a3303 | 9544 | |
068d9d1e AN |
9545 | if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) { |
9546 | NL_SET_ERR_MSG(extack, "XDP program already attached"); | |
9547 | return -EBUSY; | |
9548 | } | |
d4baa936 | 9549 | if (!offload && dev_xdp_prog(dev, other_mode)) { |
7f0a8382 | 9550 | NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time"); |
d67b9cd2 | 9551 | return -EEXIST; |
01dde20c | 9552 | } |
d4baa936 | 9553 | if (!offload && bpf_prog_is_dev_bound(new_prog->aux)) { |
7f0a8382 | 9554 | NL_SET_ERR_MSG(extack, "Using device-bound program without HW_MODE flag is not supported"); |
441a3303 JK |
9555 | return -EINVAL; |
9556 | } | |
d4baa936 | 9557 | if (new_prog->expected_attach_type == BPF_XDP_DEVMAP) { |
fbee97fe | 9558 | NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device"); |
fbee97fe DA |
9559 | return -EINVAL; |
9560 | } | |
d4baa936 AN |
9561 | if (new_prog->expected_attach_type == BPF_XDP_CPUMAP) { |
9562 | NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device"); | |
92164774 LB |
9563 | return -EINVAL; |
9564 | } | |
d4baa936 | 9565 | } |
92164774 | 9566 | |
d4baa936 AN |
9567 | /* don't call drivers if the effective program didn't change */ |
9568 | if (new_prog != cur_prog) { | |
9569 | bpf_op = dev_xdp_bpf_op(dev, mode); | |
9570 | if (!bpf_op) { | |
9571 | NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode"); | |
9572 | return -EOPNOTSUPP; | |
c14a9f63 | 9573 | } |
a7862b45 | 9574 | |
d4baa936 AN |
9575 | err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog); |
9576 | if (err) | |
9577 | return err; | |
7f0a8382 | 9578 | } |
d4baa936 | 9579 | |
aa8d3a71 AN |
9580 | if (link) |
9581 | dev_xdp_set_link(dev, mode, link); | |
9582 | else | |
9583 | dev_xdp_set_prog(dev, mode, new_prog); | |
d4baa936 AN |
9584 | if (cur_prog) |
9585 | bpf_prog_put(cur_prog); | |
a7862b45 | 9586 | |
7f0a8382 | 9587 | return 0; |
a7862b45 | 9588 | } |
a7862b45 | 9589 | |
aa8d3a71 AN |
9590 | static int dev_xdp_attach_link(struct net_device *dev, |
9591 | struct netlink_ext_ack *extack, | |
9592 | struct bpf_xdp_link *link) | |
9593 | { | |
9594 | return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags); | |
9595 | } | |
9596 | ||
9597 | static int dev_xdp_detach_link(struct net_device *dev, | |
9598 | struct netlink_ext_ack *extack, | |
9599 | struct bpf_xdp_link *link) | |
9600 | { | |
9601 | enum bpf_xdp_mode mode; | |
9602 | bpf_op_t bpf_op; | |
9603 | ||
9604 | ASSERT_RTNL(); | |
9605 | ||
c8a36f19 | 9606 | mode = dev_xdp_mode(dev, link->flags); |
aa8d3a71 AN |
9607 | if (dev_xdp_link(dev, mode) != link) |
9608 | return -EINVAL; | |
9609 | ||
9610 | bpf_op = dev_xdp_bpf_op(dev, mode); | |
9611 | WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); | |
9612 | dev_xdp_set_link(dev, mode, NULL); | |
9613 | return 0; | |
9614 | } | |
9615 | ||
9616 | static void bpf_xdp_link_release(struct bpf_link *link) | |
9617 | { | |
9618 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9619 | ||
9620 | rtnl_lock(); | |
9621 | ||
9622 | /* if racing with net_device's tear down, xdp_link->dev might be | |
9623 | * already NULL, in which case link was already auto-detached | |
9624 | */ | |
73b11c2a | 9625 | if (xdp_link->dev) { |
aa8d3a71 | 9626 | WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link)); |
73b11c2a AN |
9627 | xdp_link->dev = NULL; |
9628 | } | |
aa8d3a71 AN |
9629 | |
9630 | rtnl_unlock(); | |
9631 | } | |
9632 | ||
73b11c2a AN |
9633 | static int bpf_xdp_link_detach(struct bpf_link *link) |
9634 | { | |
9635 | bpf_xdp_link_release(link); | |
9636 | return 0; | |
9637 | } | |
9638 | ||
aa8d3a71 AN |
9639 | static void bpf_xdp_link_dealloc(struct bpf_link *link) |
9640 | { | |
9641 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9642 | ||
9643 | kfree(xdp_link); | |
9644 | } | |
9645 | ||
c1931c97 AN |
9646 | static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link, |
9647 | struct seq_file *seq) | |
9648 | { | |
9649 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9650 | u32 ifindex = 0; | |
9651 | ||
9652 | rtnl_lock(); | |
9653 | if (xdp_link->dev) | |
9654 | ifindex = xdp_link->dev->ifindex; | |
9655 | rtnl_unlock(); | |
9656 | ||
9657 | seq_printf(seq, "ifindex:\t%u\n", ifindex); | |
9658 | } | |
9659 | ||
9660 | static int bpf_xdp_link_fill_link_info(const struct bpf_link *link, | |
9661 | struct bpf_link_info *info) | |
9662 | { | |
9663 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9664 | u32 ifindex = 0; | |
9665 | ||
9666 | rtnl_lock(); | |
9667 | if (xdp_link->dev) | |
9668 | ifindex = xdp_link->dev->ifindex; | |
9669 | rtnl_unlock(); | |
9670 | ||
9671 | info->xdp.ifindex = ifindex; | |
9672 | return 0; | |
9673 | } | |
9674 | ||
026a4c28 AN |
9675 | static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, |
9676 | struct bpf_prog *old_prog) | |
9677 | { | |
9678 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9679 | enum bpf_xdp_mode mode; | |
9680 | bpf_op_t bpf_op; | |
9681 | int err = 0; | |
9682 | ||
9683 | rtnl_lock(); | |
9684 | ||
9685 | /* link might have been auto-released already, so fail */ | |
9686 | if (!xdp_link->dev) { | |
9687 | err = -ENOLINK; | |
9688 | goto out_unlock; | |
9689 | } | |
9690 | ||
9691 | if (old_prog && link->prog != old_prog) { | |
9692 | err = -EPERM; | |
9693 | goto out_unlock; | |
9694 | } | |
9695 | old_prog = link->prog; | |
9696 | if (old_prog == new_prog) { | |
9697 | /* no-op, don't disturb drivers */ | |
9698 | bpf_prog_put(new_prog); | |
9699 | goto out_unlock; | |
9700 | } | |
9701 | ||
c8a36f19 | 9702 | mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags); |
026a4c28 AN |
9703 | bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode); |
9704 | err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL, | |
9705 | xdp_link->flags, new_prog); | |
9706 | if (err) | |
9707 | goto out_unlock; | |
9708 | ||
9709 | old_prog = xchg(&link->prog, new_prog); | |
9710 | bpf_prog_put(old_prog); | |
9711 | ||
9712 | out_unlock: | |
9713 | rtnl_unlock(); | |
9714 | return err; | |
9715 | } | |
9716 | ||
aa8d3a71 AN |
9717 | static const struct bpf_link_ops bpf_xdp_link_lops = { |
9718 | .release = bpf_xdp_link_release, | |
9719 | .dealloc = bpf_xdp_link_dealloc, | |
73b11c2a | 9720 | .detach = bpf_xdp_link_detach, |
c1931c97 AN |
9721 | .show_fdinfo = bpf_xdp_link_show_fdinfo, |
9722 | .fill_link_info = bpf_xdp_link_fill_link_info, | |
026a4c28 | 9723 | .update_prog = bpf_xdp_link_update, |
aa8d3a71 AN |
9724 | }; |
9725 | ||
9726 | int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
9727 | { | |
9728 | struct net *net = current->nsproxy->net_ns; | |
9729 | struct bpf_link_primer link_primer; | |
9730 | struct bpf_xdp_link *link; | |
9731 | struct net_device *dev; | |
9732 | int err, fd; | |
9733 | ||
5acc7d3e | 9734 | rtnl_lock(); |
aa8d3a71 | 9735 | dev = dev_get_by_index(net, attr->link_create.target_ifindex); |
5acc7d3e XZ |
9736 | if (!dev) { |
9737 | rtnl_unlock(); | |
aa8d3a71 | 9738 | return -EINVAL; |
5acc7d3e | 9739 | } |
aa8d3a71 AN |
9740 | |
9741 | link = kzalloc(sizeof(*link), GFP_USER); | |
9742 | if (!link) { | |
9743 | err = -ENOMEM; | |
5acc7d3e | 9744 | goto unlock; |
aa8d3a71 AN |
9745 | } |
9746 | ||
9747 | bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog); | |
9748 | link->dev = dev; | |
9749 | link->flags = attr->link_create.flags; | |
9750 | ||
9751 | err = bpf_link_prime(&link->link, &link_primer); | |
9752 | if (err) { | |
9753 | kfree(link); | |
5acc7d3e | 9754 | goto unlock; |
aa8d3a71 AN |
9755 | } |
9756 | ||
aa8d3a71 AN |
9757 | err = dev_xdp_attach_link(dev, NULL, link); |
9758 | rtnl_unlock(); | |
9759 | ||
9760 | if (err) { | |
5acc7d3e | 9761 | link->dev = NULL; |
aa8d3a71 AN |
9762 | bpf_link_cleanup(&link_primer); |
9763 | goto out_put_dev; | |
9764 | } | |
9765 | ||
9766 | fd = bpf_link_settle(&link_primer); | |
9767 | /* link itself doesn't hold dev's refcnt to not complicate shutdown */ | |
9768 | dev_put(dev); | |
9769 | return fd; | |
9770 | ||
5acc7d3e XZ |
9771 | unlock: |
9772 | rtnl_unlock(); | |
9773 | ||
aa8d3a71 AN |
9774 | out_put_dev: |
9775 | dev_put(dev); | |
9776 | return err; | |
9777 | } | |
9778 | ||
d4baa936 AN |
9779 | /** |
9780 | * dev_change_xdp_fd - set or clear a bpf program for a device rx path | |
9781 | * @dev: device | |
9782 | * @extack: netlink extended ack | |
9783 | * @fd: new program fd or negative value to clear | |
9784 | * @expected_fd: old program fd that userspace expects to replace or clear | |
9785 | * @flags: xdp-related flags | |
9786 | * | |
9787 | * Set or clear a bpf program for a device | |
9788 | */ | |
9789 | int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, | |
9790 | int fd, int expected_fd, u32 flags) | |
9791 | { | |
c8a36f19 | 9792 | enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags); |
d4baa936 AN |
9793 | struct bpf_prog *new_prog = NULL, *old_prog = NULL; |
9794 | int err; | |
9795 | ||
9796 | ASSERT_RTNL(); | |
9797 | ||
9798 | if (fd >= 0) { | |
9799 | new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, | |
9800 | mode != XDP_MODE_SKB); | |
9801 | if (IS_ERR(new_prog)) | |
9802 | return PTR_ERR(new_prog); | |
9803 | } | |
9804 | ||
9805 | if (expected_fd >= 0) { | |
9806 | old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP, | |
9807 | mode != XDP_MODE_SKB); | |
9808 | if (IS_ERR(old_prog)) { | |
9809 | err = PTR_ERR(old_prog); | |
9810 | old_prog = NULL; | |
9811 | goto err_out; | |
c14a9f63 | 9812 | } |
a7862b45 BB |
9813 | } |
9814 | ||
aa8d3a71 | 9815 | err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags); |
a7862b45 | 9816 | |
d4baa936 AN |
9817 | err_out: |
9818 | if (err && new_prog) | |
9819 | bpf_prog_put(new_prog); | |
9820 | if (old_prog) | |
9821 | bpf_prog_put(old_prog); | |
a7862b45 BB |
9822 | return err; |
9823 | } | |
a7862b45 | 9824 | |
1da177e4 LT |
9825 | /** |
9826 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 9827 | * @net: the applicable net namespace |
1da177e4 LT |
9828 | * |
9829 | * Returns a suitable unique value for a new device interface | |
9830 | * number. The caller must hold the rtnl semaphore or the | |
9831 | * dev_base_lock to be sure it remains unique. | |
9832 | */ | |
881d966b | 9833 | static int dev_new_index(struct net *net) |
1da177e4 | 9834 | { |
aa79e66e | 9835 | int ifindex = net->ifindex; |
f4563a75 | 9836 | |
1da177e4 LT |
9837 | for (;;) { |
9838 | if (++ifindex <= 0) | |
9839 | ifindex = 1; | |
881d966b | 9840 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 9841 | return net->ifindex = ifindex; |
1da177e4 LT |
9842 | } |
9843 | } | |
9844 | ||
1da177e4 | 9845 | /* Delayed registration/unregisteration */ |
3b5b34fd | 9846 | static LIST_HEAD(net_todo_list); |
200b916f | 9847 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 9848 | |
6f05f629 | 9849 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 9850 | { |
1da177e4 | 9851 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 9852 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
9853 | } |
9854 | ||
fd867d51 JW |
9855 | static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
9856 | struct net_device *upper, netdev_features_t features) | |
9857 | { | |
9858 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
9859 | netdev_features_t feature; | |
5ba3f7d6 | 9860 | int feature_bit; |
fd867d51 | 9861 | |
3b89ea9c | 9862 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 9863 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
9864 | if (!(upper->wanted_features & feature) |
9865 | && (features & feature)) { | |
9866 | netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", | |
9867 | &feature, upper->name); | |
9868 | features &= ~feature; | |
9869 | } | |
9870 | } | |
9871 | ||
9872 | return features; | |
9873 | } | |
9874 | ||
9875 | static void netdev_sync_lower_features(struct net_device *upper, | |
9876 | struct net_device *lower, netdev_features_t features) | |
9877 | { | |
9878 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
9879 | netdev_features_t feature; | |
5ba3f7d6 | 9880 | int feature_bit; |
fd867d51 | 9881 | |
3b89ea9c | 9882 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 9883 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
9884 | if (!(features & feature) && (lower->features & feature)) { |
9885 | netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", | |
9886 | &feature, lower->name); | |
9887 | lower->wanted_features &= ~feature; | |
dd912306 | 9888 | __netdev_update_features(lower); |
fd867d51 JW |
9889 | |
9890 | if (unlikely(lower->features & feature)) | |
9891 | netdev_WARN(upper, "failed to disable %pNF on %s!\n", | |
9892 | &feature, lower->name); | |
dd912306 CW |
9893 | else |
9894 | netdev_features_change(lower); | |
fd867d51 JW |
9895 | } |
9896 | } | |
9897 | } | |
9898 | ||
c8f44aff MM |
9899 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
9900 | netdev_features_t features) | |
b63365a2 | 9901 | { |
57422dc5 MM |
9902 | /* Fix illegal checksum combinations */ |
9903 | if ((features & NETIF_F_HW_CSUM) && | |
9904 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 9905 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
9906 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
9907 | } | |
9908 | ||
b63365a2 | 9909 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 9910 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 9911 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 9912 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
9913 | } |
9914 | ||
ec5f0615 PS |
9915 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
9916 | !(features & NETIF_F_IP_CSUM)) { | |
9917 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
9918 | features &= ~NETIF_F_TSO; | |
9919 | features &= ~NETIF_F_TSO_ECN; | |
9920 | } | |
9921 | ||
9922 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
9923 | !(features & NETIF_F_IPV6_CSUM)) { | |
9924 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
9925 | features &= ~NETIF_F_TSO6; | |
9926 | } | |
9927 | ||
b1dc497b AD |
9928 | /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
9929 | if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) | |
9930 | features &= ~NETIF_F_TSO_MANGLEID; | |
9931 | ||
31d8b9e0 BH |
9932 | /* TSO ECN requires that TSO is present as well. */ |
9933 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
9934 | features &= ~NETIF_F_TSO_ECN; | |
9935 | ||
212b573f MM |
9936 | /* Software GSO depends on SG. */ |
9937 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 9938 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
9939 | features &= ~NETIF_F_GSO; |
9940 | } | |
9941 | ||
802ab55a AD |
9942 | /* GSO partial features require GSO partial be set */ |
9943 | if ((features & dev->gso_partial_features) && | |
9944 | !(features & NETIF_F_GSO_PARTIAL)) { | |
9945 | netdev_dbg(dev, | |
9946 | "Dropping partially supported GSO features since no GSO partial.\n"); | |
9947 | features &= ~dev->gso_partial_features; | |
9948 | } | |
9949 | ||
fb1f5f79 MC |
9950 | if (!(features & NETIF_F_RXCSUM)) { |
9951 | /* NETIF_F_GRO_HW implies doing RXCSUM since every packet | |
9952 | * successfully merged by hardware must also have the | |
9953 | * checksum verified by hardware. If the user does not | |
9954 | * want to enable RXCSUM, logically, we should disable GRO_HW. | |
9955 | */ | |
9956 | if (features & NETIF_F_GRO_HW) { | |
9957 | netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); | |
9958 | features &= ~NETIF_F_GRO_HW; | |
9959 | } | |
9960 | } | |
9961 | ||
de8d5ab2 GP |
9962 | /* LRO/HW-GRO features cannot be combined with RX-FCS */ |
9963 | if (features & NETIF_F_RXFCS) { | |
9964 | if (features & NETIF_F_LRO) { | |
9965 | netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); | |
9966 | features &= ~NETIF_F_LRO; | |
9967 | } | |
9968 | ||
9969 | if (features & NETIF_F_GRO_HW) { | |
9970 | netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); | |
9971 | features &= ~NETIF_F_GRO_HW; | |
9972 | } | |
e6c6a929 GP |
9973 | } |
9974 | ||
25537d71 TT |
9975 | if (features & NETIF_F_HW_TLS_TX) { |
9976 | bool ip_csum = (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) == | |
9977 | (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); | |
9978 | bool hw_csum = features & NETIF_F_HW_CSUM; | |
9979 | ||
9980 | if (!ip_csum && !hw_csum) { | |
9981 | netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n"); | |
9982 | features &= ~NETIF_F_HW_TLS_TX; | |
9983 | } | |
ae0b04b2 TT |
9984 | } |
9985 | ||
a3eb4e9d TT |
9986 | if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) { |
9987 | netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n"); | |
9988 | features &= ~NETIF_F_HW_TLS_RX; | |
9989 | } | |
9990 | ||
b63365a2 HX |
9991 | return features; |
9992 | } | |
b63365a2 | 9993 | |
6cb6a27c | 9994 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 9995 | { |
fd867d51 | 9996 | struct net_device *upper, *lower; |
c8f44aff | 9997 | netdev_features_t features; |
fd867d51 | 9998 | struct list_head *iter; |
e7868a85 | 9999 | int err = -1; |
5455c699 | 10000 | |
87267485 MM |
10001 | ASSERT_RTNL(); |
10002 | ||
5455c699 MM |
10003 | features = netdev_get_wanted_features(dev); |
10004 | ||
10005 | if (dev->netdev_ops->ndo_fix_features) | |
10006 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
10007 | ||
10008 | /* driver might be less strict about feature dependencies */ | |
10009 | features = netdev_fix_features(dev, features); | |
10010 | ||
4250b75b | 10011 | /* some features can't be enabled if they're off on an upper device */ |
fd867d51 JW |
10012 | netdev_for_each_upper_dev_rcu(dev, upper, iter) |
10013 | features = netdev_sync_upper_features(dev, upper, features); | |
10014 | ||
5455c699 | 10015 | if (dev->features == features) |
e7868a85 | 10016 | goto sync_lower; |
5455c699 | 10017 | |
c8f44aff MM |
10018 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
10019 | &dev->features, &features); | |
5455c699 MM |
10020 | |
10021 | if (dev->netdev_ops->ndo_set_features) | |
10022 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5f8dc33e NA |
10023 | else |
10024 | err = 0; | |
5455c699 | 10025 | |
6cb6a27c | 10026 | if (unlikely(err < 0)) { |
5455c699 | 10027 | netdev_err(dev, |
c8f44aff MM |
10028 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
10029 | err, &features, &dev->features); | |
17b85d29 NA |
10030 | /* return non-0 since some features might have changed and |
10031 | * it's better to fire a spurious notification than miss it | |
10032 | */ | |
10033 | return -1; | |
6cb6a27c MM |
10034 | } |
10035 | ||
e7868a85 | 10036 | sync_lower: |
fd867d51 JW |
10037 | /* some features must be disabled on lower devices when disabled |
10038 | * on an upper device (think: bonding master or bridge) | |
10039 | */ | |
10040 | netdev_for_each_lower_dev(dev, lower, iter) | |
10041 | netdev_sync_lower_features(dev, lower, features); | |
10042 | ||
ae847f40 SD |
10043 | if (!err) { |
10044 | netdev_features_t diff = features ^ dev->features; | |
10045 | ||
10046 | if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
10047 | /* udp_tunnel_{get,drop}_rx_info both need | |
10048 | * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the | |
10049 | * device, or they won't do anything. | |
10050 | * Thus we need to update dev->features | |
10051 | * *before* calling udp_tunnel_get_rx_info, | |
10052 | * but *after* calling udp_tunnel_drop_rx_info. | |
10053 | */ | |
10054 | if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
10055 | dev->features = features; | |
10056 | udp_tunnel_get_rx_info(dev); | |
10057 | } else { | |
10058 | udp_tunnel_drop_rx_info(dev); | |
10059 | } | |
10060 | } | |
10061 | ||
9daae9bd GP |
10062 | if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { |
10063 | if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
10064 | dev->features = features; | |
10065 | err |= vlan_get_rx_ctag_filter_info(dev); | |
10066 | } else { | |
10067 | vlan_drop_rx_ctag_filter_info(dev); | |
10068 | } | |
10069 | } | |
10070 | ||
10071 | if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { | |
10072 | if (features & NETIF_F_HW_VLAN_STAG_FILTER) { | |
10073 | dev->features = features; | |
10074 | err |= vlan_get_rx_stag_filter_info(dev); | |
10075 | } else { | |
10076 | vlan_drop_rx_stag_filter_info(dev); | |
10077 | } | |
10078 | } | |
10079 | ||
6cb6a27c | 10080 | dev->features = features; |
ae847f40 | 10081 | } |
6cb6a27c | 10082 | |
e7868a85 | 10083 | return err < 0 ? 0 : 1; |
6cb6a27c MM |
10084 | } |
10085 | ||
afe12cc8 MM |
10086 | /** |
10087 | * netdev_update_features - recalculate device features | |
10088 | * @dev: the device to check | |
10089 | * | |
10090 | * Recalculate dev->features set and send notifications if it | |
10091 | * has changed. Should be called after driver or hardware dependent | |
10092 | * conditions might have changed that influence the features. | |
10093 | */ | |
6cb6a27c MM |
10094 | void netdev_update_features(struct net_device *dev) |
10095 | { | |
10096 | if (__netdev_update_features(dev)) | |
10097 | netdev_features_change(dev); | |
5455c699 MM |
10098 | } |
10099 | EXPORT_SYMBOL(netdev_update_features); | |
10100 | ||
afe12cc8 MM |
10101 | /** |
10102 | * netdev_change_features - recalculate device features | |
10103 | * @dev: the device to check | |
10104 | * | |
10105 | * Recalculate dev->features set and send notifications even | |
10106 | * if they have not changed. Should be called instead of | |
10107 | * netdev_update_features() if also dev->vlan_features might | |
10108 | * have changed to allow the changes to be propagated to stacked | |
10109 | * VLAN devices. | |
10110 | */ | |
10111 | void netdev_change_features(struct net_device *dev) | |
10112 | { | |
10113 | __netdev_update_features(dev); | |
10114 | netdev_features_change(dev); | |
10115 | } | |
10116 | EXPORT_SYMBOL(netdev_change_features); | |
10117 | ||
fc4a7489 PM |
10118 | /** |
10119 | * netif_stacked_transfer_operstate - transfer operstate | |
10120 | * @rootdev: the root or lower level device to transfer state from | |
10121 | * @dev: the device to transfer operstate to | |
10122 | * | |
10123 | * Transfer operational state from root to device. This is normally | |
10124 | * called when a stacking relationship exists between the root | |
10125 | * device and the device(a leaf device). | |
10126 | */ | |
10127 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
10128 | struct net_device *dev) | |
10129 | { | |
10130 | if (rootdev->operstate == IF_OPER_DORMANT) | |
10131 | netif_dormant_on(dev); | |
10132 | else | |
10133 | netif_dormant_off(dev); | |
10134 | ||
eec517cd AL |
10135 | if (rootdev->operstate == IF_OPER_TESTING) |
10136 | netif_testing_on(dev); | |
10137 | else | |
10138 | netif_testing_off(dev); | |
10139 | ||
0575c86b ZS |
10140 | if (netif_carrier_ok(rootdev)) |
10141 | netif_carrier_on(dev); | |
10142 | else | |
10143 | netif_carrier_off(dev); | |
fc4a7489 PM |
10144 | } |
10145 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
10146 | ||
1b4bf461 ED |
10147 | static int netif_alloc_rx_queues(struct net_device *dev) |
10148 | { | |
1b4bf461 | 10149 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 10150 | struct netdev_rx_queue *rx; |
10595902 | 10151 | size_t sz = count * sizeof(*rx); |
e817f856 | 10152 | int err = 0; |
1b4bf461 | 10153 | |
bd25fa7b | 10154 | BUG_ON(count < 1); |
1b4bf461 | 10155 | |
c948f51c | 10156 | rx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
10157 | if (!rx) |
10158 | return -ENOMEM; | |
10159 | ||
bd25fa7b TH |
10160 | dev->_rx = rx; |
10161 | ||
e817f856 | 10162 | for (i = 0; i < count; i++) { |
fe822240 | 10163 | rx[i].dev = dev; |
e817f856 JDB |
10164 | |
10165 | /* XDP RX-queue setup */ | |
b02e5a0e | 10166 | err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0); |
e817f856 JDB |
10167 | if (err < 0) |
10168 | goto err_rxq_info; | |
10169 | } | |
1b4bf461 | 10170 | return 0; |
e817f856 JDB |
10171 | |
10172 | err_rxq_info: | |
10173 | /* Rollback successful reg's and free other resources */ | |
10174 | while (i--) | |
10175 | xdp_rxq_info_unreg(&rx[i].xdp_rxq); | |
141b52a9 | 10176 | kvfree(dev->_rx); |
e817f856 JDB |
10177 | dev->_rx = NULL; |
10178 | return err; | |
10179 | } | |
10180 | ||
10181 | static void netif_free_rx_queues(struct net_device *dev) | |
10182 | { | |
10183 | unsigned int i, count = dev->num_rx_queues; | |
e817f856 JDB |
10184 | |
10185 | /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ | |
10186 | if (!dev->_rx) | |
10187 | return; | |
10188 | ||
e817f856 | 10189 | for (i = 0; i < count; i++) |
82aaff2f JK |
10190 | xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq); |
10191 | ||
10192 | kvfree(dev->_rx); | |
1b4bf461 ED |
10193 | } |
10194 | ||
aa942104 CG |
10195 | static void netdev_init_one_queue(struct net_device *dev, |
10196 | struct netdev_queue *queue, void *_unused) | |
10197 | { | |
10198 | /* Initialize queue lock */ | |
10199 | spin_lock_init(&queue->_xmit_lock); | |
1a33e10e | 10200 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); |
aa942104 | 10201 | queue->xmit_lock_owner = -1; |
b236da69 | 10202 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 10203 | queue->dev = dev; |
114cf580 TH |
10204 | #ifdef CONFIG_BQL |
10205 | dql_init(&queue->dql, HZ); | |
10206 | #endif | |
aa942104 CG |
10207 | } |
10208 | ||
60877a32 ED |
10209 | static void netif_free_tx_queues(struct net_device *dev) |
10210 | { | |
4cb28970 | 10211 | kvfree(dev->_tx); |
60877a32 ED |
10212 | } |
10213 | ||
e6484930 TH |
10214 | static int netif_alloc_netdev_queues(struct net_device *dev) |
10215 | { | |
10216 | unsigned int count = dev->num_tx_queues; | |
10217 | struct netdev_queue *tx; | |
60877a32 | 10218 | size_t sz = count * sizeof(*tx); |
e6484930 | 10219 | |
d339727c ED |
10220 | if (count < 1 || count > 0xffff) |
10221 | return -EINVAL; | |
62b5942a | 10222 | |
c948f51c | 10223 | tx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
10224 | if (!tx) |
10225 | return -ENOMEM; | |
10226 | ||
e6484930 | 10227 | dev->_tx = tx; |
1d24eb48 | 10228 | |
e6484930 TH |
10229 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
10230 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
10231 | |
10232 | return 0; | |
e6484930 TH |
10233 | } |
10234 | ||
a2029240 DV |
10235 | void netif_tx_stop_all_queues(struct net_device *dev) |
10236 | { | |
10237 | unsigned int i; | |
10238 | ||
10239 | for (i = 0; i < dev->num_tx_queues; i++) { | |
10240 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f4563a75 | 10241 | |
a2029240 DV |
10242 | netif_tx_stop_queue(txq); |
10243 | } | |
10244 | } | |
10245 | EXPORT_SYMBOL(netif_tx_stop_all_queues); | |
10246 | ||
1da177e4 LT |
10247 | /** |
10248 | * register_netdevice - register a network device | |
10249 | * @dev: device to register | |
10250 | * | |
10251 | * Take a completed network device structure and add it to the kernel | |
10252 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
10253 | * chain. 0 is returned on success. A negative errno code is returned | |
10254 | * on a failure to set up the device, or if the name is a duplicate. | |
10255 | * | |
10256 | * Callers must hold the rtnl semaphore. You may want | |
10257 | * register_netdev() instead of this. | |
10258 | * | |
10259 | * BUGS: | |
10260 | * The locking appears insufficient to guarantee two parallel registers | |
10261 | * will not get the same name. | |
10262 | */ | |
10263 | ||
10264 | int register_netdevice(struct net_device *dev) | |
10265 | { | |
1da177e4 | 10266 | int ret; |
d314774c | 10267 | struct net *net = dev_net(dev); |
1da177e4 | 10268 | |
e283de3a FF |
10269 | BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < |
10270 | NETDEV_FEATURE_COUNT); | |
1da177e4 LT |
10271 | BUG_ON(dev_boot_phase); |
10272 | ASSERT_RTNL(); | |
10273 | ||
b17a7c17 SH |
10274 | might_sleep(); |
10275 | ||
1da177e4 LT |
10276 | /* When net_device's are persistent, this will be fatal. */ |
10277 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 10278 | BUG_ON(!net); |
1da177e4 | 10279 | |
9000edb7 JK |
10280 | ret = ethtool_check_ops(dev->ethtool_ops); |
10281 | if (ret) | |
10282 | return ret; | |
10283 | ||
f1f28aa3 | 10284 | spin_lock_init(&dev->addr_list_lock); |
845e0ebb | 10285 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 10286 | |
828de4f6 | 10287 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
10288 | if (ret < 0) |
10289 | goto out; | |
10290 | ||
9077f052 | 10291 | ret = -ENOMEM; |
ff927412 JP |
10292 | dev->name_node = netdev_name_node_head_alloc(dev); |
10293 | if (!dev->name_node) | |
10294 | goto out; | |
10295 | ||
1da177e4 | 10296 | /* Init, if this function is available */ |
d314774c SH |
10297 | if (dev->netdev_ops->ndo_init) { |
10298 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
10299 | if (ret) { |
10300 | if (ret > 0) | |
10301 | ret = -EIO; | |
42c17fa6 | 10302 | goto err_free_name; |
1da177e4 LT |
10303 | } |
10304 | } | |
4ec93edb | 10305 | |
f646968f PM |
10306 | if (((dev->hw_features | dev->features) & |
10307 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
10308 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
10309 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
10310 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
10311 | ret = -EINVAL; | |
10312 | goto err_uninit; | |
10313 | } | |
10314 | ||
9c7dafbf PE |
10315 | ret = -EBUSY; |
10316 | if (!dev->ifindex) | |
10317 | dev->ifindex = dev_new_index(net); | |
10318 | else if (__dev_get_by_index(net, dev->ifindex)) | |
10319 | goto err_uninit; | |
10320 | ||
5455c699 MM |
10321 | /* Transfer changeable features to wanted_features and enable |
10322 | * software offloads (GSO and GRO). | |
10323 | */ | |
1a3c998f | 10324 | dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF); |
14d1232f | 10325 | dev->features |= NETIF_F_SOFT_FEATURES; |
d764a122 | 10326 | |
876c4384 | 10327 | if (dev->udp_tunnel_nic_info) { |
d764a122 SD |
10328 | dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; |
10329 | dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
10330 | } | |
10331 | ||
14d1232f | 10332 | dev->wanted_features = dev->features & dev->hw_features; |
1da177e4 | 10333 | |
cbc53e08 | 10334 | if (!(dev->flags & IFF_LOOPBACK)) |
34324dc2 | 10335 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
cbc53e08 | 10336 | |
7f348a60 AD |
10337 | /* If IPv4 TCP segmentation offload is supported we should also |
10338 | * allow the device to enable segmenting the frame with the option | |
10339 | * of ignoring a static IP ID value. This doesn't enable the | |
10340 | * feature itself but allows the user to enable it later. | |
10341 | */ | |
cbc53e08 AD |
10342 | if (dev->hw_features & NETIF_F_TSO) |
10343 | dev->hw_features |= NETIF_F_TSO_MANGLEID; | |
7f348a60 AD |
10344 | if (dev->vlan_features & NETIF_F_TSO) |
10345 | dev->vlan_features |= NETIF_F_TSO_MANGLEID; | |
10346 | if (dev->mpls_features & NETIF_F_TSO) | |
10347 | dev->mpls_features |= NETIF_F_TSO_MANGLEID; | |
10348 | if (dev->hw_enc_features & NETIF_F_TSO) | |
10349 | dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; | |
c6e1a0d1 | 10350 | |
1180e7d6 | 10351 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 10352 | */ |
1180e7d6 | 10353 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 10354 | |
ee579677 PS |
10355 | /* Make NETIF_F_SG inheritable to tunnel devices. |
10356 | */ | |
802ab55a | 10357 | dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
ee579677 | 10358 | |
0d89d203 SH |
10359 | /* Make NETIF_F_SG inheritable to MPLS. |
10360 | */ | |
10361 | dev->mpls_features |= NETIF_F_SG; | |
10362 | ||
7ffbe3fd JB |
10363 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
10364 | ret = notifier_to_errno(ret); | |
10365 | if (ret) | |
10366 | goto err_uninit; | |
10367 | ||
8b41d188 | 10368 | ret = netdev_register_kobject(dev); |
cb626bf5 JH |
10369 | if (ret) { |
10370 | dev->reg_state = NETREG_UNREGISTERED; | |
7ce1b0ed | 10371 | goto err_uninit; |
cb626bf5 | 10372 | } |
b17a7c17 SH |
10373 | dev->reg_state = NETREG_REGISTERED; |
10374 | ||
6cb6a27c | 10375 | __netdev_update_features(dev); |
8e9b59b2 | 10376 | |
1da177e4 LT |
10377 | /* |
10378 | * Default initial state at registry is that the | |
10379 | * device is present. | |
10380 | */ | |
10381 | ||
10382 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
10383 | ||
8f4cccbb BH |
10384 | linkwatch_init_dev(dev); |
10385 | ||
1da177e4 | 10386 | dev_init_scheduler(dev); |
1da177e4 | 10387 | dev_hold(dev); |
ce286d32 | 10388 | list_netdevice(dev); |
7bf23575 | 10389 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 10390 | |
948b337e JP |
10391 | /* If the device has permanent device address, driver should |
10392 | * set dev_addr and also addr_assign_type should be set to | |
10393 | * NET_ADDR_PERM (default value). | |
10394 | */ | |
10395 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
10396 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
10397 | ||
1da177e4 | 10398 | /* Notify protocols, that a new device appeared. */ |
056925ab | 10399 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 10400 | ret = notifier_to_errno(ret); |
93ee31f1 | 10401 | if (ret) { |
766b0515 JK |
10402 | /* Expect explicit free_netdev() on failure */ |
10403 | dev->needs_free_netdev = false; | |
037e56bd | 10404 | unregister_netdevice_queue(dev, NULL); |
766b0515 | 10405 | goto out; |
93ee31f1 | 10406 | } |
d90a909e EB |
10407 | /* |
10408 | * Prevent userspace races by waiting until the network | |
10409 | * device is fully setup before sending notifications. | |
10410 | */ | |
a2835763 PM |
10411 | if (!dev->rtnl_link_ops || |
10412 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 10413 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
10414 | |
10415 | out: | |
10416 | return ret; | |
7ce1b0ed HX |
10417 | |
10418 | err_uninit: | |
d314774c SH |
10419 | if (dev->netdev_ops->ndo_uninit) |
10420 | dev->netdev_ops->ndo_uninit(dev); | |
cf124db5 DM |
10421 | if (dev->priv_destructor) |
10422 | dev->priv_destructor(dev); | |
42c17fa6 DC |
10423 | err_free_name: |
10424 | netdev_name_node_free(dev->name_node); | |
7ce1b0ed | 10425 | goto out; |
1da177e4 | 10426 | } |
d1b19dff | 10427 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 10428 | |
937f1ba5 BH |
10429 | /** |
10430 | * init_dummy_netdev - init a dummy network device for NAPI | |
10431 | * @dev: device to init | |
10432 | * | |
10433 | * This takes a network device structure and initialize the minimum | |
10434 | * amount of fields so it can be used to schedule NAPI polls without | |
10435 | * registering a full blown interface. This is to be used by drivers | |
10436 | * that need to tie several hardware interfaces to a single NAPI | |
10437 | * poll scheduler due to HW limitations. | |
10438 | */ | |
10439 | int init_dummy_netdev(struct net_device *dev) | |
10440 | { | |
10441 | /* Clear everything. Note we don't initialize spinlocks | |
10442 | * are they aren't supposed to be taken by any of the | |
10443 | * NAPI code and this dummy netdev is supposed to be | |
10444 | * only ever used for NAPI polls | |
10445 | */ | |
10446 | memset(dev, 0, sizeof(struct net_device)); | |
10447 | ||
10448 | /* make sure we BUG if trying to hit standard | |
10449 | * register/unregister code path | |
10450 | */ | |
10451 | dev->reg_state = NETREG_DUMMY; | |
10452 | ||
937f1ba5 BH |
10453 | /* NAPI wants this */ |
10454 | INIT_LIST_HEAD(&dev->napi_list); | |
10455 | ||
10456 | /* a dummy interface is started by default */ | |
10457 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
10458 | set_bit(__LINK_STATE_START, &dev->state); | |
10459 | ||
35edfdc7 JE |
10460 | /* napi_busy_loop stats accounting wants this */ |
10461 | dev_net_set(dev, &init_net); | |
10462 | ||
29b4433d ED |
10463 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
10464 | * because users of this 'device' dont need to change | |
10465 | * its refcount. | |
10466 | */ | |
10467 | ||
937f1ba5 BH |
10468 | return 0; |
10469 | } | |
10470 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
10471 | ||
10472 | ||
1da177e4 LT |
10473 | /** |
10474 | * register_netdev - register a network device | |
10475 | * @dev: device to register | |
10476 | * | |
10477 | * Take a completed network device structure and add it to the kernel | |
10478 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
10479 | * chain. 0 is returned on success. A negative errno code is returned | |
10480 | * on a failure to set up the device, or if the name is a duplicate. | |
10481 | * | |
38b4da38 | 10482 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
10483 | * and expands the device name if you passed a format string to |
10484 | * alloc_netdev. | |
10485 | */ | |
10486 | int register_netdev(struct net_device *dev) | |
10487 | { | |
10488 | int err; | |
10489 | ||
b0f3debc KT |
10490 | if (rtnl_lock_killable()) |
10491 | return -EINTR; | |
1da177e4 | 10492 | err = register_netdevice(dev); |
1da177e4 LT |
10493 | rtnl_unlock(); |
10494 | return err; | |
10495 | } | |
10496 | EXPORT_SYMBOL(register_netdev); | |
10497 | ||
29b4433d ED |
10498 | int netdev_refcnt_read(const struct net_device *dev) |
10499 | { | |
919067cc | 10500 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d ED |
10501 | int i, refcnt = 0; |
10502 | ||
10503 | for_each_possible_cpu(i) | |
10504 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
10505 | return refcnt; | |
919067cc ED |
10506 | #else |
10507 | return refcount_read(&dev->dev_refcnt); | |
10508 | #endif | |
29b4433d ED |
10509 | } |
10510 | EXPORT_SYMBOL(netdev_refcnt_read); | |
10511 | ||
5aa3afe1 DV |
10512 | int netdev_unregister_timeout_secs __read_mostly = 10; |
10513 | ||
de2b541b MCC |
10514 | #define WAIT_REFS_MIN_MSECS 1 |
10515 | #define WAIT_REFS_MAX_MSECS 250 | |
2c53040f | 10516 | /** |
1da177e4 | 10517 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 10518 | * @dev: target net_device |
1da177e4 LT |
10519 | * |
10520 | * This is called when unregistering network devices. | |
10521 | * | |
10522 | * Any protocol or device that holds a reference should register | |
10523 | * for netdevice notification, and cleanup and put back the | |
10524 | * reference if they receive an UNREGISTER event. | |
10525 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 10526 | * call dev_put. |
1da177e4 LT |
10527 | */ |
10528 | static void netdev_wait_allrefs(struct net_device *dev) | |
10529 | { | |
10530 | unsigned long rebroadcast_time, warning_time; | |
0e4be9e5 | 10531 | int wait = 0, refcnt; |
1da177e4 | 10532 | |
e014debe ED |
10533 | linkwatch_forget_dev(dev); |
10534 | ||
1da177e4 | 10535 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
10536 | refcnt = netdev_refcnt_read(dev); |
10537 | ||
add2d736 | 10538 | while (refcnt != 1) { |
1da177e4 | 10539 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 10540 | rtnl_lock(); |
1da177e4 LT |
10541 | |
10542 | /* Rebroadcast unregister notification */ | |
056925ab | 10543 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 10544 | |
748e2d93 | 10545 | __rtnl_unlock(); |
0115e8e3 | 10546 | rcu_barrier(); |
748e2d93 ED |
10547 | rtnl_lock(); |
10548 | ||
1da177e4 LT |
10549 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
10550 | &dev->state)) { | |
10551 | /* We must not have linkwatch events | |
10552 | * pending on unregister. If this | |
10553 | * happens, we simply run the queue | |
10554 | * unscheduled, resulting in a noop | |
10555 | * for this device. | |
10556 | */ | |
10557 | linkwatch_run_queue(); | |
10558 | } | |
10559 | ||
6756ae4b | 10560 | __rtnl_unlock(); |
1da177e4 LT |
10561 | |
10562 | rebroadcast_time = jiffies; | |
10563 | } | |
10564 | ||
0e4be9e5 FR |
10565 | if (!wait) { |
10566 | rcu_barrier(); | |
10567 | wait = WAIT_REFS_MIN_MSECS; | |
10568 | } else { | |
10569 | msleep(wait); | |
10570 | wait = min(wait << 1, WAIT_REFS_MAX_MSECS); | |
10571 | } | |
1da177e4 | 10572 | |
29b4433d ED |
10573 | refcnt = netdev_refcnt_read(dev); |
10574 | ||
6c996e19 | 10575 | if (refcnt != 1 && |
5aa3afe1 DV |
10576 | time_after(jiffies, warning_time + |
10577 | netdev_unregister_timeout_secs * HZ)) { | |
7b6cd1ce JP |
10578 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
10579 | dev->name, refcnt); | |
1da177e4 LT |
10580 | warning_time = jiffies; |
10581 | } | |
10582 | } | |
10583 | } | |
10584 | ||
10585 | /* The sequence is: | |
10586 | * | |
10587 | * rtnl_lock(); | |
10588 | * ... | |
10589 | * register_netdevice(x1); | |
10590 | * register_netdevice(x2); | |
10591 | * ... | |
10592 | * unregister_netdevice(y1); | |
10593 | * unregister_netdevice(y2); | |
10594 | * ... | |
10595 | * rtnl_unlock(); | |
10596 | * free_netdev(y1); | |
10597 | * free_netdev(y2); | |
10598 | * | |
58ec3b4d | 10599 | * We are invoked by rtnl_unlock(). |
1da177e4 | 10600 | * This allows us to deal with problems: |
b17a7c17 | 10601 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
10602 | * without deadlocking with linkwatch via keventd. |
10603 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
10604 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
10605 | * |
10606 | * We must not return until all unregister events added during | |
10607 | * the interval the lock was held have been completed. | |
1da177e4 | 10608 | */ |
1da177e4 LT |
10609 | void netdev_run_todo(void) |
10610 | { | |
626ab0e6 | 10611 | struct list_head list; |
1fc70edb TY |
10612 | #ifdef CONFIG_LOCKDEP |
10613 | struct list_head unlink_list; | |
10614 | ||
10615 | list_replace_init(&net_unlink_list, &unlink_list); | |
10616 | ||
10617 | while (!list_empty(&unlink_list)) { | |
10618 | struct net_device *dev = list_first_entry(&unlink_list, | |
10619 | struct net_device, | |
10620 | unlink_list); | |
0e8b8d6a | 10621 | list_del_init(&dev->unlink_list); |
1fc70edb TY |
10622 | dev->nested_level = dev->lower_level - 1; |
10623 | } | |
10624 | #endif | |
1da177e4 | 10625 | |
1da177e4 | 10626 | /* Snapshot list, allow later requests */ |
626ab0e6 | 10627 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
10628 | |
10629 | __rtnl_unlock(); | |
626ab0e6 | 10630 | |
0115e8e3 ED |
10631 | |
10632 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
10633 | if (!list_empty(&list)) |
10634 | rcu_barrier(); | |
10635 | ||
1da177e4 LT |
10636 | while (!list_empty(&list)) { |
10637 | struct net_device *dev | |
e5e26d75 | 10638 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
10639 | list_del(&dev->todo_list); |
10640 | ||
b17a7c17 | 10641 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 10642 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
10643 | dev->name, dev->reg_state); |
10644 | dump_stack(); | |
10645 | continue; | |
10646 | } | |
1da177e4 | 10647 | |
b17a7c17 | 10648 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 10649 | |
b17a7c17 | 10650 | netdev_wait_allrefs(dev); |
1da177e4 | 10651 | |
b17a7c17 | 10652 | /* paranoia */ |
add2d736 | 10653 | BUG_ON(netdev_refcnt_read(dev) != 1); |
7866a621 SN |
10654 | BUG_ON(!list_empty(&dev->ptype_all)); |
10655 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
10656 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
10657 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
330c7272 | 10658 | #if IS_ENABLED(CONFIG_DECNET) |
547b792c | 10659 | WARN_ON(dev->dn_ptr); |
330c7272 | 10660 | #endif |
cf124db5 DM |
10661 | if (dev->priv_destructor) |
10662 | dev->priv_destructor(dev); | |
10663 | if (dev->needs_free_netdev) | |
10664 | free_netdev(dev); | |
9093bbb2 | 10665 | |
50624c93 EB |
10666 | /* Report a network device has been unregistered */ |
10667 | rtnl_lock(); | |
10668 | dev_net(dev)->dev_unreg_count--; | |
10669 | __rtnl_unlock(); | |
10670 | wake_up(&netdev_unregistering_wq); | |
10671 | ||
9093bbb2 SH |
10672 | /* Free network device */ |
10673 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 10674 | } |
1da177e4 LT |
10675 | } |
10676 | ||
9256645a JW |
10677 | /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
10678 | * all the same fields in the same order as net_device_stats, with only | |
10679 | * the type differing, but rtnl_link_stats64 may have additional fields | |
10680 | * at the end for newer counters. | |
3cfde79c | 10681 | */ |
77a1abf5 ED |
10682 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
10683 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
10684 | { |
10685 | #if BITS_PER_LONG == 64 | |
9256645a | 10686 | BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats)); |
9af9959e | 10687 | memcpy(stats64, netdev_stats, sizeof(*netdev_stats)); |
9256645a JW |
10688 | /* zero out counters that only exist in rtnl_link_stats64 */ |
10689 | memset((char *)stats64 + sizeof(*netdev_stats), 0, | |
10690 | sizeof(*stats64) - sizeof(*netdev_stats)); | |
3cfde79c | 10691 | #else |
9256645a | 10692 | size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long); |
3cfde79c BH |
10693 | const unsigned long *src = (const unsigned long *)netdev_stats; |
10694 | u64 *dst = (u64 *)stats64; | |
10695 | ||
9256645a | 10696 | BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
3cfde79c BH |
10697 | for (i = 0; i < n; i++) |
10698 | dst[i] = src[i]; | |
9256645a JW |
10699 | /* zero out counters that only exist in rtnl_link_stats64 */ |
10700 | memset((char *)stats64 + n * sizeof(u64), 0, | |
10701 | sizeof(*stats64) - n * sizeof(u64)); | |
3cfde79c BH |
10702 | #endif |
10703 | } | |
77a1abf5 | 10704 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 10705 | |
eeda3fd6 SH |
10706 | /** |
10707 | * dev_get_stats - get network device statistics | |
10708 | * @dev: device to get statistics from | |
28172739 | 10709 | * @storage: place to store stats |
eeda3fd6 | 10710 | * |
d7753516 BH |
10711 | * Get network statistics from device. Return @storage. |
10712 | * The device driver may provide its own method by setting | |
10713 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
10714 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 10715 | */ |
d7753516 BH |
10716 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
10717 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 10718 | { |
eeda3fd6 SH |
10719 | const struct net_device_ops *ops = dev->netdev_ops; |
10720 | ||
28172739 ED |
10721 | if (ops->ndo_get_stats64) { |
10722 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
10723 | ops->ndo_get_stats64(dev, storage); |
10724 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 10725 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
10726 | } else { |
10727 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 10728 | } |
6f64ec74 ED |
10729 | storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped); |
10730 | storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped); | |
10731 | storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler); | |
28172739 | 10732 | return storage; |
c45d286e | 10733 | } |
eeda3fd6 | 10734 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 10735 | |
44fa32f0 HK |
10736 | /** |
10737 | * dev_fetch_sw_netstats - get per-cpu network device statistics | |
10738 | * @s: place to store stats | |
10739 | * @netstats: per-cpu network stats to read from | |
10740 | * | |
10741 | * Read per-cpu network statistics and populate the related fields in @s. | |
10742 | */ | |
10743 | void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, | |
10744 | const struct pcpu_sw_netstats __percpu *netstats) | |
10745 | { | |
10746 | int cpu; | |
10747 | ||
10748 | for_each_possible_cpu(cpu) { | |
10749 | const struct pcpu_sw_netstats *stats; | |
10750 | struct pcpu_sw_netstats tmp; | |
10751 | unsigned int start; | |
10752 | ||
10753 | stats = per_cpu_ptr(netstats, cpu); | |
10754 | do { | |
10755 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
10756 | tmp.rx_packets = stats->rx_packets; | |
10757 | tmp.rx_bytes = stats->rx_bytes; | |
10758 | tmp.tx_packets = stats->tx_packets; | |
10759 | tmp.tx_bytes = stats->tx_bytes; | |
10760 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
10761 | ||
10762 | s->rx_packets += tmp.rx_packets; | |
10763 | s->rx_bytes += tmp.rx_bytes; | |
10764 | s->tx_packets += tmp.tx_packets; | |
10765 | s->tx_bytes += tmp.tx_bytes; | |
10766 | } | |
10767 | } | |
10768 | EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats); | |
10769 | ||
a1839426 HK |
10770 | /** |
10771 | * dev_get_tstats64 - ndo_get_stats64 implementation | |
10772 | * @dev: device to get statistics from | |
10773 | * @s: place to store stats | |
10774 | * | |
10775 | * Populate @s from dev->stats and dev->tstats. Can be used as | |
10776 | * ndo_get_stats64() callback. | |
10777 | */ | |
10778 | void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s) | |
10779 | { | |
10780 | netdev_stats_to_stats64(s, &dev->stats); | |
10781 | dev_fetch_sw_netstats(s, dev->tstats); | |
10782 | } | |
10783 | EXPORT_SYMBOL_GPL(dev_get_tstats64); | |
10784 | ||
24824a09 | 10785 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 10786 | { |
24824a09 | 10787 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 10788 | |
24824a09 ED |
10789 | #ifdef CONFIG_NET_CLS_ACT |
10790 | if (queue) | |
10791 | return queue; | |
10792 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
10793 | if (!queue) | |
10794 | return NULL; | |
10795 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 10796 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
24824a09 ED |
10797 | queue->qdisc_sleeping = &noop_qdisc; |
10798 | rcu_assign_pointer(dev->ingress_queue, queue); | |
10799 | #endif | |
10800 | return queue; | |
bb949fbd DM |
10801 | } |
10802 | ||
2c60db03 ED |
10803 | static const struct ethtool_ops default_ethtool_ops; |
10804 | ||
d07d7507 SG |
10805 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
10806 | const struct ethtool_ops *ops) | |
10807 | { | |
10808 | if (dev->ethtool_ops == &default_ethtool_ops) | |
10809 | dev->ethtool_ops = ops; | |
10810 | } | |
10811 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
10812 | ||
74d332c1 ED |
10813 | void netdev_freemem(struct net_device *dev) |
10814 | { | |
10815 | char *addr = (char *)dev - dev->padded; | |
10816 | ||
4cb28970 | 10817 | kvfree(addr); |
74d332c1 ED |
10818 | } |
10819 | ||
1da177e4 | 10820 | /** |
722c9a0c | 10821 | * alloc_netdev_mqs - allocate network device |
10822 | * @sizeof_priv: size of private data to allocate space for | |
10823 | * @name: device name format string | |
10824 | * @name_assign_type: origin of device name | |
10825 | * @setup: callback to initialize device | |
10826 | * @txqs: the number of TX subqueues to allocate | |
10827 | * @rxqs: the number of RX subqueues to allocate | |
10828 | * | |
10829 | * Allocates a struct net_device with private data area for driver use | |
10830 | * and performs basic initialization. Also allocates subqueue structs | |
10831 | * for each queue on the device. | |
1da177e4 | 10832 | */ |
36909ea4 | 10833 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 10834 | unsigned char name_assign_type, |
36909ea4 TH |
10835 | void (*setup)(struct net_device *), |
10836 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 10837 | { |
1da177e4 | 10838 | struct net_device *dev; |
52a59bd5 | 10839 | unsigned int alloc_size; |
1ce8e7b5 | 10840 | struct net_device *p; |
1da177e4 | 10841 | |
b6fe17d6 SH |
10842 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
10843 | ||
36909ea4 | 10844 | if (txqs < 1) { |
7b6cd1ce | 10845 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
10846 | return NULL; |
10847 | } | |
10848 | ||
36909ea4 | 10849 | if (rxqs < 1) { |
7b6cd1ce | 10850 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
10851 | return NULL; |
10852 | } | |
36909ea4 | 10853 | |
fd2ea0a7 | 10854 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
10855 | if (sizeof_priv) { |
10856 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 10857 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
10858 | alloc_size += sizeof_priv; |
10859 | } | |
10860 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 10861 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 10862 | |
c948f51c | 10863 | p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
62b5942a | 10864 | if (!p) |
1da177e4 | 10865 | return NULL; |
1da177e4 | 10866 | |
1ce8e7b5 | 10867 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 10868 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 10869 | |
919067cc | 10870 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d ED |
10871 | dev->pcpu_refcnt = alloc_percpu(int); |
10872 | if (!dev->pcpu_refcnt) | |
74d332c1 | 10873 | goto free_dev; |
add2d736 ED |
10874 | dev_hold(dev); |
10875 | #else | |
10876 | refcount_set(&dev->dev_refcnt, 1); | |
919067cc | 10877 | #endif |
ab9c73cc | 10878 | |
ab9c73cc | 10879 | if (dev_addr_init(dev)) |
29b4433d | 10880 | goto free_pcpu; |
ab9c73cc | 10881 | |
22bedad3 | 10882 | dev_mc_init(dev); |
a748ee24 | 10883 | dev_uc_init(dev); |
ccffad25 | 10884 | |
c346dca1 | 10885 | dev_net_set(dev, &init_net); |
1da177e4 | 10886 | |
8d3bdbd5 | 10887 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 10888 | dev->gso_max_segs = GSO_MAX_SEGS; |
5343da4c TY |
10889 | dev->upper_level = 1; |
10890 | dev->lower_level = 1; | |
1fc70edb TY |
10891 | #ifdef CONFIG_LOCKDEP |
10892 | dev->nested_level = 0; | |
10893 | INIT_LIST_HEAD(&dev->unlink_list); | |
10894 | #endif | |
8d3bdbd5 | 10895 | |
8d3bdbd5 DM |
10896 | INIT_LIST_HEAD(&dev->napi_list); |
10897 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 10898 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 10899 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
10900 | INIT_LIST_HEAD(&dev->adj_list.upper); |
10901 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
7866a621 SN |
10902 | INIT_LIST_HEAD(&dev->ptype_all); |
10903 | INIT_LIST_HEAD(&dev->ptype_specific); | |
93642e14 | 10904 | INIT_LIST_HEAD(&dev->net_notifier_list); |
59cc1f61 JK |
10905 | #ifdef CONFIG_NET_SCHED |
10906 | hash_init(dev->qdisc_hash); | |
10907 | #endif | |
02875878 | 10908 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
10909 | setup(dev); |
10910 | ||
a813104d | 10911 | if (!dev->tx_queue_len) { |
f84bb1ea | 10912 | dev->priv_flags |= IFF_NO_QUEUE; |
11597084 | 10913 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
a813104d | 10914 | } |
906470c1 | 10915 | |
36909ea4 TH |
10916 | dev->num_tx_queues = txqs; |
10917 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 10918 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 10919 | goto free_all; |
e8a0464c | 10920 | |
36909ea4 TH |
10921 | dev->num_rx_queues = rxqs; |
10922 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 10923 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 10924 | goto free_all; |
0a9627f2 | 10925 | |
1da177e4 | 10926 | strcpy(dev->name, name); |
c835a677 | 10927 | dev->name_assign_type = name_assign_type; |
cbda10fa | 10928 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
10929 | if (!dev->ethtool_ops) |
10930 | dev->ethtool_ops = &default_ethtool_ops; | |
e687ad60 | 10931 | |
357b6cc5 | 10932 | nf_hook_ingress_init(dev); |
e687ad60 | 10933 | |
1da177e4 | 10934 | return dev; |
ab9c73cc | 10935 | |
8d3bdbd5 DM |
10936 | free_all: |
10937 | free_netdev(dev); | |
10938 | return NULL; | |
10939 | ||
29b4433d | 10940 | free_pcpu: |
919067cc | 10941 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d | 10942 | free_percpu(dev->pcpu_refcnt); |
74d332c1 | 10943 | free_dev: |
919067cc | 10944 | #endif |
74d332c1 | 10945 | netdev_freemem(dev); |
ab9c73cc | 10946 | return NULL; |
1da177e4 | 10947 | } |
36909ea4 | 10948 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
10949 | |
10950 | /** | |
722c9a0c | 10951 | * free_netdev - free network device |
10952 | * @dev: device | |
1da177e4 | 10953 | * |
722c9a0c | 10954 | * This function does the last stage of destroying an allocated device |
10955 | * interface. The reference to the device object is released. If this | |
10956 | * is the last reference then it will be freed.Must be called in process | |
10957 | * context. | |
1da177e4 LT |
10958 | */ |
10959 | void free_netdev(struct net_device *dev) | |
10960 | { | |
d565b0a1 HX |
10961 | struct napi_struct *p, *n; |
10962 | ||
93d05d4a | 10963 | might_sleep(); |
c269a24c JK |
10964 | |
10965 | /* When called immediately after register_netdevice() failed the unwind | |
10966 | * handling may still be dismantling the device. Handle that case by | |
10967 | * deferring the free. | |
10968 | */ | |
10969 | if (dev->reg_state == NETREG_UNREGISTERING) { | |
10970 | ASSERT_RTNL(); | |
10971 | dev->needs_free_netdev = true; | |
10972 | return; | |
10973 | } | |
10974 | ||
60877a32 | 10975 | netif_free_tx_queues(dev); |
e817f856 | 10976 | netif_free_rx_queues(dev); |
e8a0464c | 10977 | |
33d480ce | 10978 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 10979 | |
f001fde5 JP |
10980 | /* Flush device addresses */ |
10981 | dev_addr_flush(dev); | |
10982 | ||
d565b0a1 HX |
10983 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
10984 | netif_napi_del(p); | |
10985 | ||
919067cc | 10986 | #ifdef CONFIG_PCPU_DEV_REFCNT |
29b4433d ED |
10987 | free_percpu(dev->pcpu_refcnt); |
10988 | dev->pcpu_refcnt = NULL; | |
919067cc | 10989 | #endif |
75ccae62 THJ |
10990 | free_percpu(dev->xdp_bulkq); |
10991 | dev->xdp_bulkq = NULL; | |
29b4433d | 10992 | |
3041a069 | 10993 | /* Compatibility with error handling in drivers */ |
1da177e4 | 10994 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 10995 | netdev_freemem(dev); |
1da177e4 LT |
10996 | return; |
10997 | } | |
10998 | ||
10999 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
11000 | dev->reg_state = NETREG_RELEASED; | |
11001 | ||
43cb76d9 GKH |
11002 | /* will free via device release */ |
11003 | put_device(&dev->dev); | |
1da177e4 | 11004 | } |
d1b19dff | 11005 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 11006 | |
f0db275a SH |
11007 | /** |
11008 | * synchronize_net - Synchronize with packet receive processing | |
11009 | * | |
11010 | * Wait for packets currently being received to be done. | |
11011 | * Does not block later packets from starting. | |
11012 | */ | |
4ec93edb | 11013 | void synchronize_net(void) |
1da177e4 LT |
11014 | { |
11015 | might_sleep(); | |
be3fc413 ED |
11016 | if (rtnl_is_locked()) |
11017 | synchronize_rcu_expedited(); | |
11018 | else | |
11019 | synchronize_rcu(); | |
1da177e4 | 11020 | } |
d1b19dff | 11021 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
11022 | |
11023 | /** | |
44a0873d | 11024 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 11025 | * @dev: device |
44a0873d | 11026 | * @head: list |
6ebfbc06 | 11027 | * |
1da177e4 | 11028 | * This function shuts down a device interface and removes it |
d59b54b1 | 11029 | * from the kernel tables. |
44a0873d | 11030 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
11031 | * |
11032 | * Callers must hold the rtnl semaphore. You may want | |
11033 | * unregister_netdev() instead of this. | |
11034 | */ | |
11035 | ||
44a0873d | 11036 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 11037 | { |
a6620712 HX |
11038 | ASSERT_RTNL(); |
11039 | ||
44a0873d | 11040 | if (head) { |
9fdce099 | 11041 | list_move_tail(&dev->unreg_list, head); |
44a0873d | 11042 | } else { |
037e56bd JK |
11043 | LIST_HEAD(single); |
11044 | ||
11045 | list_add(&dev->unreg_list, &single); | |
0cbe1e57 | 11046 | unregister_netdevice_many(&single); |
44a0873d | 11047 | } |
1da177e4 | 11048 | } |
44a0873d | 11049 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 11050 | |
9b5e383c ED |
11051 | /** |
11052 | * unregister_netdevice_many - unregister many devices | |
11053 | * @head: list of devices | |
87757a91 ED |
11054 | * |
11055 | * Note: As most callers use a stack allocated list_head, | |
11056 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
11057 | */ |
11058 | void unregister_netdevice_many(struct list_head *head) | |
bcfe2f1a JK |
11059 | { |
11060 | struct net_device *dev, *tmp; | |
11061 | LIST_HEAD(close_head); | |
11062 | ||
11063 | BUG_ON(dev_boot_phase); | |
11064 | ASSERT_RTNL(); | |
11065 | ||
0cbe1e57 JK |
11066 | if (list_empty(head)) |
11067 | return; | |
11068 | ||
bcfe2f1a JK |
11069 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
11070 | /* Some devices call without registering | |
11071 | * for initialization unwind. Remove those | |
11072 | * devices and proceed with the remaining. | |
11073 | */ | |
11074 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
11075 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", | |
11076 | dev->name, dev); | |
11077 | ||
11078 | WARN_ON(1); | |
11079 | list_del(&dev->unreg_list); | |
11080 | continue; | |
11081 | } | |
11082 | dev->dismantle = true; | |
11083 | BUG_ON(dev->reg_state != NETREG_REGISTERED); | |
11084 | } | |
11085 | ||
11086 | /* If device is running, close it first. */ | |
11087 | list_for_each_entry(dev, head, unreg_list) | |
11088 | list_add_tail(&dev->close_list, &close_head); | |
11089 | dev_close_many(&close_head, true); | |
11090 | ||
11091 | list_for_each_entry(dev, head, unreg_list) { | |
11092 | /* And unlink it from device chain. */ | |
11093 | unlist_netdevice(dev); | |
11094 | ||
11095 | dev->reg_state = NETREG_UNREGISTERING; | |
11096 | } | |
11097 | flush_all_backlogs(); | |
11098 | ||
11099 | synchronize_net(); | |
11100 | ||
11101 | list_for_each_entry(dev, head, unreg_list) { | |
11102 | struct sk_buff *skb = NULL; | |
11103 | ||
11104 | /* Shutdown queueing discipline. */ | |
11105 | dev_shutdown(dev); | |
11106 | ||
11107 | dev_xdp_uninstall(dev); | |
11108 | ||
11109 | /* Notify protocols, that we are about to destroy | |
11110 | * this device. They should clean all the things. | |
11111 | */ | |
11112 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
11113 | ||
11114 | if (!dev->rtnl_link_ops || | |
11115 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
11116 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, | |
11117 | GFP_KERNEL, NULL, 0); | |
11118 | ||
11119 | /* | |
11120 | * Flush the unicast and multicast chains | |
11121 | */ | |
11122 | dev_uc_flush(dev); | |
11123 | dev_mc_flush(dev); | |
11124 | ||
11125 | netdev_name_node_alt_flush(dev); | |
11126 | netdev_name_node_free(dev->name_node); | |
11127 | ||
11128 | if (dev->netdev_ops->ndo_uninit) | |
11129 | dev->netdev_ops->ndo_uninit(dev); | |
11130 | ||
11131 | if (skb) | |
11132 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); | |
11133 | ||
11134 | /* Notifier chain MUST detach us all upper devices. */ | |
11135 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
11136 | WARN_ON(netdev_has_any_lower_dev(dev)); | |
11137 | ||
11138 | /* Remove entries from kobject tree */ | |
11139 | netdev_unregister_kobject(dev); | |
11140 | #ifdef CONFIG_XPS | |
11141 | /* Remove XPS queueing entries */ | |
11142 | netif_reset_xps_queues_gt(dev, 0); | |
11143 | #endif | |
11144 | } | |
11145 | ||
11146 | synchronize_net(); | |
11147 | ||
11148 | list_for_each_entry(dev, head, unreg_list) { | |
11149 | dev_put(dev); | |
11150 | net_set_todo(dev); | |
11151 | } | |
0cbe1e57 JK |
11152 | |
11153 | list_del(head); | |
bcfe2f1a | 11154 | } |
0cbe1e57 | 11155 | EXPORT_SYMBOL(unregister_netdevice_many); |
bcfe2f1a | 11156 | |
1da177e4 LT |
11157 | /** |
11158 | * unregister_netdev - remove device from the kernel | |
11159 | * @dev: device | |
11160 | * | |
11161 | * This function shuts down a device interface and removes it | |
d59b54b1 | 11162 | * from the kernel tables. |
1da177e4 LT |
11163 | * |
11164 | * This is just a wrapper for unregister_netdevice that takes | |
11165 | * the rtnl semaphore. In general you want to use this and not | |
11166 | * unregister_netdevice. | |
11167 | */ | |
11168 | void unregister_netdev(struct net_device *dev) | |
11169 | { | |
11170 | rtnl_lock(); | |
11171 | unregister_netdevice(dev); | |
11172 | rtnl_unlock(); | |
11173 | } | |
1da177e4 LT |
11174 | EXPORT_SYMBOL(unregister_netdev); |
11175 | ||
ce286d32 | 11176 | /** |
0854fa82 | 11177 | * __dev_change_net_namespace - move device to different nethost namespace |
ce286d32 EB |
11178 | * @dev: device |
11179 | * @net: network namespace | |
11180 | * @pat: If not NULL name pattern to try if the current device name | |
11181 | * is already taken in the destination network namespace. | |
eeb85a14 AV |
11182 | * @new_ifindex: If not zero, specifies device index in the target |
11183 | * namespace. | |
ce286d32 EB |
11184 | * |
11185 | * This function shuts down a device interface and moves it | |
11186 | * to a new network namespace. On success 0 is returned, on | |
11187 | * a failure a netagive errno code is returned. | |
11188 | * | |
11189 | * Callers must hold the rtnl semaphore. | |
11190 | */ | |
11191 | ||
0854fa82 AV |
11192 | int __dev_change_net_namespace(struct net_device *dev, struct net *net, |
11193 | const char *pat, int new_ifindex) | |
ce286d32 | 11194 | { |
ef6a4c88 | 11195 | struct net *net_old = dev_net(dev); |
eeb85a14 | 11196 | int err, new_nsid; |
ce286d32 EB |
11197 | |
11198 | ASSERT_RTNL(); | |
11199 | ||
11200 | /* Don't allow namespace local devices to be moved. */ | |
11201 | err = -EINVAL; | |
11202 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
11203 | goto out; | |
11204 | ||
11205 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
11206 | if (dev->reg_state != NETREG_REGISTERED) |
11207 | goto out; | |
11208 | ||
11209 | /* Get out if there is nothing todo */ | |
11210 | err = 0; | |
ef6a4c88 | 11211 | if (net_eq(net_old, net)) |
ce286d32 EB |
11212 | goto out; |
11213 | ||
11214 | /* Pick the destination device name, and ensure | |
11215 | * we can use it in the destination network namespace. | |
11216 | */ | |
11217 | err = -EEXIST; | |
d9031024 | 11218 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
11219 | /* We get here if we can't use the current device name */ |
11220 | if (!pat) | |
11221 | goto out; | |
7892bd08 LR |
11222 | err = dev_get_valid_name(net, dev, pat); |
11223 | if (err < 0) | |
ce286d32 EB |
11224 | goto out; |
11225 | } | |
11226 | ||
eeb85a14 AV |
11227 | /* Check that new_ifindex isn't used yet. */ |
11228 | err = -EBUSY; | |
11229 | if (new_ifindex && __dev_get_by_index(net, new_ifindex)) | |
11230 | goto out; | |
11231 | ||
ce286d32 EB |
11232 | /* |
11233 | * And now a mini version of register_netdevice unregister_netdevice. | |
11234 | */ | |
11235 | ||
11236 | /* If device is running close it first. */ | |
9b772652 | 11237 | dev_close(dev); |
ce286d32 EB |
11238 | |
11239 | /* And unlink it from device chain */ | |
ce286d32 EB |
11240 | unlist_netdevice(dev); |
11241 | ||
11242 | synchronize_net(); | |
11243 | ||
11244 | /* Shutdown queueing discipline. */ | |
11245 | dev_shutdown(dev); | |
11246 | ||
11247 | /* Notify protocols, that we are about to destroy | |
eb13da1a | 11248 | * this device. They should clean all the things. |
11249 | * | |
11250 | * Note that dev->reg_state stays at NETREG_REGISTERED. | |
11251 | * This is wanted because this way 8021q and macvlan know | |
11252 | * the device is just moving and can keep their slaves up. | |
11253 | */ | |
ce286d32 | 11254 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
6549dd43 | 11255 | rcu_barrier(); |
38e01b30 | 11256 | |
d4e4fdf9 | 11257 | new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL); |
38e01b30 | 11258 | /* If there is an ifindex conflict assign a new one */ |
eeb85a14 AV |
11259 | if (!new_ifindex) { |
11260 | if (__dev_get_by_index(net, dev->ifindex)) | |
11261 | new_ifindex = dev_new_index(net); | |
11262 | else | |
11263 | new_ifindex = dev->ifindex; | |
11264 | } | |
38e01b30 ND |
11265 | |
11266 | rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, | |
11267 | new_ifindex); | |
ce286d32 EB |
11268 | |
11269 | /* | |
11270 | * Flush the unicast and multicast chains | |
11271 | */ | |
a748ee24 | 11272 | dev_uc_flush(dev); |
22bedad3 | 11273 | dev_mc_flush(dev); |
ce286d32 | 11274 | |
4e66ae2e SH |
11275 | /* Send a netdev-removed uevent to the old namespace */ |
11276 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 11277 | netdev_adjacent_del_links(dev); |
4e66ae2e | 11278 | |
93642e14 JP |
11279 | /* Move per-net netdevice notifiers that are following the netdevice */ |
11280 | move_netdevice_notifiers_dev_net(dev, net); | |
11281 | ||
ce286d32 | 11282 | /* Actually switch the network namespace */ |
c346dca1 | 11283 | dev_net_set(dev, net); |
38e01b30 | 11284 | dev->ifindex = new_ifindex; |
ce286d32 | 11285 | |
4e66ae2e SH |
11286 | /* Send a netdev-add uevent to the new namespace */ |
11287 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 11288 | netdev_adjacent_add_links(dev); |
4e66ae2e | 11289 | |
8b41d188 | 11290 | /* Fixup kobjects */ |
a1b3f594 | 11291 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 11292 | WARN_ON(err); |
ce286d32 | 11293 | |
ef6a4c88 CB |
11294 | /* Adapt owner in case owning user namespace of target network |
11295 | * namespace is different from the original one. | |
11296 | */ | |
11297 | err = netdev_change_owner(dev, net_old, net); | |
11298 | WARN_ON(err); | |
11299 | ||
ce286d32 EB |
11300 | /* Add the device back in the hashes */ |
11301 | list_netdevice(dev); | |
11302 | ||
11303 | /* Notify protocols, that a new device appeared. */ | |
11304 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
11305 | ||
d90a909e EB |
11306 | /* |
11307 | * Prevent userspace races by waiting until the network | |
11308 | * device is fully setup before sending notifications. | |
11309 | */ | |
7f294054 | 11310 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 11311 | |
ce286d32 EB |
11312 | synchronize_net(); |
11313 | err = 0; | |
11314 | out: | |
11315 | return err; | |
11316 | } | |
0854fa82 | 11317 | EXPORT_SYMBOL_GPL(__dev_change_net_namespace); |
ce286d32 | 11318 | |
f0bf90de | 11319 | static int dev_cpu_dead(unsigned int oldcpu) |
1da177e4 LT |
11320 | { |
11321 | struct sk_buff **list_skb; | |
1da177e4 | 11322 | struct sk_buff *skb; |
f0bf90de | 11323 | unsigned int cpu; |
97d8b6e3 | 11324 | struct softnet_data *sd, *oldsd, *remsd = NULL; |
1da177e4 | 11325 | |
1da177e4 LT |
11326 | local_irq_disable(); |
11327 | cpu = smp_processor_id(); | |
11328 | sd = &per_cpu(softnet_data, cpu); | |
11329 | oldsd = &per_cpu(softnet_data, oldcpu); | |
11330 | ||
11331 | /* Find end of our completion_queue. */ | |
11332 | list_skb = &sd->completion_queue; | |
11333 | while (*list_skb) | |
11334 | list_skb = &(*list_skb)->next; | |
11335 | /* Append completion queue from offline CPU. */ | |
11336 | *list_skb = oldsd->completion_queue; | |
11337 | oldsd->completion_queue = NULL; | |
11338 | ||
1da177e4 | 11339 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
11340 | if (oldsd->output_queue) { |
11341 | *sd->output_queue_tailp = oldsd->output_queue; | |
11342 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
11343 | oldsd->output_queue = NULL; | |
11344 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
11345 | } | |
ac64da0b ED |
11346 | /* Append NAPI poll list from offline CPU, with one exception : |
11347 | * process_backlog() must be called by cpu owning percpu backlog. | |
11348 | * We properly handle process_queue & input_pkt_queue later. | |
11349 | */ | |
11350 | while (!list_empty(&oldsd->poll_list)) { | |
11351 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
11352 | struct napi_struct, | |
11353 | poll_list); | |
11354 | ||
11355 | list_del_init(&napi->poll_list); | |
11356 | if (napi->poll == process_backlog) | |
11357 | napi->state = 0; | |
11358 | else | |
11359 | ____napi_schedule(sd, napi); | |
264524d5 | 11360 | } |
1da177e4 LT |
11361 | |
11362 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
11363 | local_irq_enable(); | |
11364 | ||
773fc8f6 | 11365 | #ifdef CONFIG_RPS |
11366 | remsd = oldsd->rps_ipi_list; | |
11367 | oldsd->rps_ipi_list = NULL; | |
11368 | #endif | |
11369 | /* send out pending IPI's on offline CPU */ | |
11370 | net_rps_send_ipi(remsd); | |
11371 | ||
1da177e4 | 11372 | /* Process offline CPU's input_pkt_queue */ |
76cc8b13 | 11373 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
91e83133 | 11374 | netif_rx_ni(skb); |
76cc8b13 | 11375 | input_queue_head_incr(oldsd); |
fec5e652 | 11376 | } |
ac64da0b | 11377 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
91e83133 | 11378 | netif_rx_ni(skb); |
76cc8b13 TH |
11379 | input_queue_head_incr(oldsd); |
11380 | } | |
1da177e4 | 11381 | |
f0bf90de | 11382 | return 0; |
1da177e4 | 11383 | } |
1da177e4 | 11384 | |
7f353bf2 | 11385 | /** |
b63365a2 HX |
11386 | * netdev_increment_features - increment feature set by one |
11387 | * @all: current feature set | |
11388 | * @one: new feature set | |
11389 | * @mask: mask feature set | |
7f353bf2 HX |
11390 | * |
11391 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
11392 | * @one to the master device with current feature set @all. Will not |
11393 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 11394 | */ |
c8f44aff MM |
11395 | netdev_features_t netdev_increment_features(netdev_features_t all, |
11396 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 11397 | { |
c8cd0989 | 11398 | if (mask & NETIF_F_HW_CSUM) |
a188222b | 11399 | mask |= NETIF_F_CSUM_MASK; |
1742f183 | 11400 | mask |= NETIF_F_VLAN_CHALLENGED; |
7f353bf2 | 11401 | |
a188222b | 11402 | all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
1742f183 | 11403 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
c6e1a0d1 | 11404 | |
1742f183 | 11405 | /* If one device supports hw checksumming, set for all. */ |
c8cd0989 TH |
11406 | if (all & NETIF_F_HW_CSUM) |
11407 | all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); | |
7f353bf2 HX |
11408 | |
11409 | return all; | |
11410 | } | |
b63365a2 | 11411 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 11412 | |
430f03cd | 11413 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
11414 | { |
11415 | int i; | |
11416 | struct hlist_head *hash; | |
11417 | ||
6da2ec56 | 11418 | hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL); |
30d97d35 PE |
11419 | if (hash != NULL) |
11420 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
11421 | INIT_HLIST_HEAD(&hash[i]); | |
11422 | ||
11423 | return hash; | |
11424 | } | |
11425 | ||
881d966b | 11426 | /* Initialize per network namespace state */ |
4665079c | 11427 | static int __net_init netdev_init(struct net *net) |
881d966b | 11428 | { |
d9f37d01 | 11429 | BUILD_BUG_ON(GRO_HASH_BUCKETS > |
c593642c | 11430 | 8 * sizeof_field(struct napi_struct, gro_bitmask)); |
d9f37d01 | 11431 | |
734b6541 RM |
11432 | if (net != &init_net) |
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 | |
a30c7b42 JP |
11443 | RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain); |
11444 | ||
881d966b | 11445 | return 0; |
30d97d35 PE |
11446 | |
11447 | err_idx: | |
11448 | kfree(net->dev_name_head); | |
11449 | err_name: | |
11450 | return -ENOMEM; | |
881d966b EB |
11451 | } |
11452 | ||
f0db275a SH |
11453 | /** |
11454 | * netdev_drivername - network driver for the device | |
11455 | * @dev: network device | |
f0db275a SH |
11456 | * |
11457 | * Determine network driver for device. | |
11458 | */ | |
3019de12 | 11459 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 11460 | { |
cf04a4c7 SH |
11461 | const struct device_driver *driver; |
11462 | const struct device *parent; | |
3019de12 | 11463 | const char *empty = ""; |
6579e57b AV |
11464 | |
11465 | parent = dev->dev.parent; | |
6579e57b | 11466 | if (!parent) |
3019de12 | 11467 | return empty; |
6579e57b AV |
11468 | |
11469 | driver = parent->driver; | |
11470 | if (driver && driver->name) | |
3019de12 DM |
11471 | return driver->name; |
11472 | return empty; | |
6579e57b AV |
11473 | } |
11474 | ||
6ea754eb JP |
11475 | static void __netdev_printk(const char *level, const struct net_device *dev, |
11476 | struct va_format *vaf) | |
256df2f3 | 11477 | { |
b004ff49 | 11478 | if (dev && dev->dev.parent) { |
6ea754eb JP |
11479 | dev_printk_emit(level[1] - '0', |
11480 | dev->dev.parent, | |
11481 | "%s %s %s%s: %pV", | |
11482 | dev_driver_string(dev->dev.parent), | |
11483 | dev_name(dev->dev.parent), | |
11484 | netdev_name(dev), netdev_reg_state(dev), | |
11485 | vaf); | |
b004ff49 | 11486 | } else if (dev) { |
6ea754eb JP |
11487 | printk("%s%s%s: %pV", |
11488 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 11489 | } else { |
6ea754eb | 11490 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 11491 | } |
256df2f3 JP |
11492 | } |
11493 | ||
6ea754eb JP |
11494 | void netdev_printk(const char *level, const struct net_device *dev, |
11495 | const char *format, ...) | |
256df2f3 JP |
11496 | { |
11497 | struct va_format vaf; | |
11498 | va_list args; | |
256df2f3 JP |
11499 | |
11500 | va_start(args, format); | |
11501 | ||
11502 | vaf.fmt = format; | |
11503 | vaf.va = &args; | |
11504 | ||
6ea754eb | 11505 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 11506 | |
256df2f3 | 11507 | va_end(args); |
256df2f3 JP |
11508 | } |
11509 | EXPORT_SYMBOL(netdev_printk); | |
11510 | ||
11511 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 11512 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 11513 | { \ |
256df2f3 JP |
11514 | struct va_format vaf; \ |
11515 | va_list args; \ | |
11516 | \ | |
11517 | va_start(args, fmt); \ | |
11518 | \ | |
11519 | vaf.fmt = fmt; \ | |
11520 | vaf.va = &args; \ | |
11521 | \ | |
6ea754eb | 11522 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 11523 | \ |
256df2f3 | 11524 | va_end(args); \ |
256df2f3 JP |
11525 | } \ |
11526 | EXPORT_SYMBOL(func); | |
11527 | ||
11528 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
11529 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
11530 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
11531 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
11532 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
11533 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
11534 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
11535 | ||
4665079c | 11536 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
11537 | { |
11538 | kfree(net->dev_name_head); | |
11539 | kfree(net->dev_index_head); | |
ee21b18b VA |
11540 | if (net != &init_net) |
11541 | WARN_ON_ONCE(!list_empty(&net->dev_base_head)); | |
881d966b EB |
11542 | } |
11543 | ||
022cbae6 | 11544 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
11545 | .init = netdev_init, |
11546 | .exit = netdev_exit, | |
11547 | }; | |
11548 | ||
4665079c | 11549 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 11550 | { |
e008b5fc | 11551 | struct net_device *dev, *aux; |
ce286d32 | 11552 | /* |
e008b5fc | 11553 | * Push all migratable network devices back to the |
ce286d32 EB |
11554 | * initial network namespace |
11555 | */ | |
11556 | rtnl_lock(); | |
e008b5fc | 11557 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 11558 | int err; |
aca51397 | 11559 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
11560 | |
11561 | /* Ignore unmoveable devices (i.e. loopback) */ | |
11562 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
11563 | continue; | |
11564 | ||
e008b5fc | 11565 | /* Leave virtual devices for the generic cleanup */ |
3a5ca857 | 11566 | if (dev->rtnl_link_ops && !dev->rtnl_link_ops->netns_refund) |
e008b5fc | 11567 | continue; |
d0c082ce | 11568 | |
25985edc | 11569 | /* Push remaining network devices to init_net */ |
aca51397 | 11570 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
55b40dbf JP |
11571 | if (__dev_get_by_name(&init_net, fb_name)) |
11572 | snprintf(fb_name, IFNAMSIZ, "dev%%d"); | |
0854fa82 | 11573 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
ce286d32 | 11574 | if (err) { |
7b6cd1ce JP |
11575 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
11576 | __func__, dev->name, err); | |
aca51397 | 11577 | BUG(); |
ce286d32 EB |
11578 | } |
11579 | } | |
11580 | rtnl_unlock(); | |
11581 | } | |
11582 | ||
50624c93 EB |
11583 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
11584 | { | |
11585 | /* Return with the rtnl_lock held when there are no network | |
11586 | * devices unregistering in any network namespace in net_list. | |
11587 | */ | |
11588 | struct net *net; | |
11589 | bool unregistering; | |
ff960a73 | 11590 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
50624c93 | 11591 | |
ff960a73 | 11592 | add_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 | 11593 | for (;;) { |
50624c93 EB |
11594 | unregistering = false; |
11595 | rtnl_lock(); | |
11596 | list_for_each_entry(net, net_list, exit_list) { | |
11597 | if (net->dev_unreg_count > 0) { | |
11598 | unregistering = true; | |
11599 | break; | |
11600 | } | |
11601 | } | |
11602 | if (!unregistering) | |
11603 | break; | |
11604 | __rtnl_unlock(); | |
ff960a73 PZ |
11605 | |
11606 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
50624c93 | 11607 | } |
ff960a73 | 11608 | remove_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 EB |
11609 | } |
11610 | ||
04dc7f6b EB |
11611 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
11612 | { | |
11613 | /* At exit all network devices most be removed from a network | |
b595076a | 11614 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
11615 | * Do this across as many network namespaces as possible to |
11616 | * improve batching efficiency. | |
11617 | */ | |
11618 | struct net_device *dev; | |
11619 | struct net *net; | |
11620 | LIST_HEAD(dev_kill_list); | |
11621 | ||
50624c93 EB |
11622 | /* To prevent network device cleanup code from dereferencing |
11623 | * loopback devices or network devices that have been freed | |
11624 | * wait here for all pending unregistrations to complete, | |
11625 | * before unregistring the loopback device and allowing the | |
11626 | * network namespace be freed. | |
11627 | * | |
11628 | * The netdev todo list containing all network devices | |
11629 | * unregistrations that happen in default_device_exit_batch | |
11630 | * will run in the rtnl_unlock() at the end of | |
11631 | * default_device_exit_batch. | |
11632 | */ | |
11633 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
11634 | list_for_each_entry(net, net_list, exit_list) { |
11635 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 11636 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
11637 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
11638 | else | |
11639 | unregister_netdevice_queue(dev, &dev_kill_list); | |
11640 | } | |
11641 | } | |
11642 | unregister_netdevice_many(&dev_kill_list); | |
11643 | rtnl_unlock(); | |
11644 | } | |
11645 | ||
022cbae6 | 11646 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 11647 | .exit = default_device_exit, |
04dc7f6b | 11648 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
11649 | }; |
11650 | ||
1da177e4 LT |
11651 | /* |
11652 | * Initialize the DEV module. At boot time this walks the device list and | |
11653 | * unhooks any devices that fail to initialise (normally hardware not | |
11654 | * present) and leaves us with a valid list of present and active devices. | |
11655 | * | |
11656 | */ | |
11657 | ||
11658 | /* | |
11659 | * This is called single threaded during boot, so no need | |
11660 | * to take the rtnl semaphore. | |
11661 | */ | |
11662 | static int __init net_dev_init(void) | |
11663 | { | |
11664 | int i, rc = -ENOMEM; | |
11665 | ||
11666 | BUG_ON(!dev_boot_phase); | |
11667 | ||
1da177e4 LT |
11668 | if (dev_proc_init()) |
11669 | goto out; | |
11670 | ||
8b41d188 | 11671 | if (netdev_kobject_init()) |
1da177e4 LT |
11672 | goto out; |
11673 | ||
11674 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 11675 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
11676 | INIT_LIST_HEAD(&ptype_base[i]); |
11677 | ||
62532da9 VY |
11678 | INIT_LIST_HEAD(&offload_base); |
11679 | ||
881d966b EB |
11680 | if (register_pernet_subsys(&netdev_net_ops)) |
11681 | goto out; | |
1da177e4 LT |
11682 | |
11683 | /* | |
11684 | * Initialise the packet receive queues. | |
11685 | */ | |
11686 | ||
6f912042 | 11687 | for_each_possible_cpu(i) { |
41852497 | 11688 | struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
e36fa2f7 | 11689 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 11690 | |
41852497 ED |
11691 | INIT_WORK(flush, flush_backlog); |
11692 | ||
e36fa2f7 | 11693 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 11694 | skb_queue_head_init(&sd->process_queue); |
f53c7239 SK |
11695 | #ifdef CONFIG_XFRM_OFFLOAD |
11696 | skb_queue_head_init(&sd->xfrm_backlog); | |
11697 | #endif | |
e36fa2f7 | 11698 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 11699 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 11700 | #ifdef CONFIG_RPS |
545b8c8d | 11701 | INIT_CSD(&sd->csd, rps_trigger_softirq, sd); |
e36fa2f7 | 11702 | sd->cpu = i; |
1e94d72f | 11703 | #endif |
0a9627f2 | 11704 | |
7c4ec749 | 11705 | init_gro_hash(&sd->backlog); |
e36fa2f7 ED |
11706 | sd->backlog.poll = process_backlog; |
11707 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
11708 | } |
11709 | ||
1da177e4 LT |
11710 | dev_boot_phase = 0; |
11711 | ||
505d4f73 EB |
11712 | /* The loopback device is special if any other network devices |
11713 | * is present in a network namespace the loopback device must | |
11714 | * be present. Since we now dynamically allocate and free the | |
11715 | * loopback device ensure this invariant is maintained by | |
11716 | * keeping the loopback device as the first device on the | |
11717 | * list of network devices. Ensuring the loopback devices | |
11718 | * is the first device that appears and the last network device | |
11719 | * that disappears. | |
11720 | */ | |
11721 | if (register_pernet_device(&loopback_net_ops)) | |
11722 | goto out; | |
11723 | ||
11724 | if (register_pernet_device(&default_device_ops)) | |
11725 | goto out; | |
11726 | ||
962cf36c CM |
11727 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
11728 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 | 11729 | |
f0bf90de SAS |
11730 | rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
11731 | NULL, dev_cpu_dead); | |
11732 | WARN_ON(rc < 0); | |
1da177e4 LT |
11733 | rc = 0; |
11734 | out: | |
11735 | return rc; | |
11736 | } | |
11737 | ||
11738 | subsys_initcall(net_dev_init); |