1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * NET3 Protocol independent device support routines.
5 * Derived from the non IP parts of dev.c 1.0.19
7 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
8 * Mark Evans, <evansmp@uhura.aston.ac.uk>
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>
19 * D.J. Barrow : Fixed bug where dev->refcnt gets set
20 * to 2 if register_netdev gets called
21 * before net_dev_init & also removed a
22 * few lines of code in the process.
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
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.
35 * Alan Cox : Fix ETH_P_ALL echoback lengths.
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
41 * Alan Cox : Hashed net_bh()
42 * Richard Kooijman: Timestamp fixes.
43 * Alan Cox : Wrong field in SIOCGIFDSTADDR
44 * Alan Cox : Device lock protection.
45 * Alan Cox : Fixed nasty side effect of device close
47 * Rudi Cilibrasi : Pass the right thing to
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
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
63 * Paul Rusty Russell : SIOCSIFNAME
64 * Pekka Riikonen : Netdev boot-time settings code
65 * Andrew Morton : Make unregister_netdevice wait
66 * indefinitely on dev->refcnt
67 * J Hadi Salim : - Backlog queue sampling
68 * - netif_rx() feedback
71 #include <linux/uaccess.h>
72 #include <linux/bitmap.h>
73 #include <linux/capability.h>
74 #include <linux/cpu.h>
75 #include <linux/types.h>
76 #include <linux/kernel.h>
77 #include <linux/hash.h>
78 #include <linux/slab.h>
79 #include <linux/sched.h>
80 #include <linux/sched/mm.h>
81 #include <linux/mutex.h>
82 #include <linux/rwsem.h>
83 #include <linux/string.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>
92 #include <linux/ethtool.h>
93 #include <linux/skbuff.h>
94 #include <linux/kthread.h>
95 #include <linux/bpf.h>
96 #include <linux/bpf_trace.h>
97 #include <net/net_namespace.h>
99 #include <net/busy_poll.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/stat.h>
104 #include <net/dst_metadata.h>
106 #include <net/pkt_sched.h>
107 #include <net/pkt_cls.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
111 #include <linux/highmem.h>
112 #include <linux/init.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/iw_handler.h>
118 #include <asm/current.h>
119 #include <linux/audit.h>
120 #include <linux/dmaengine.h>
121 #include <linux/err.h>
122 #include <linux/ctype.h>
123 #include <linux/if_arp.h>
124 #include <linux/if_vlan.h>
125 #include <linux/ip.h>
127 #include <net/mpls.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <trace/events/net.h>
134 #include <trace/events/skb.h>
135 #include <trace/events/qdisc.h>
136 #include <trace/events/xdp.h>
137 #include <linux/inetdevice.h>
138 #include <linux/cpu_rmap.h>
139 #include <linux/static_key.h>
140 #include <linux/hashtable.h>
141 #include <linux/vmalloc.h>
142 #include <linux/if_macvlan.h>
143 #include <linux/errqueue.h>
144 #include <linux/hrtimer.h>
145 #include <linux/netfilter_netdev.h>
146 #include <linux/crash_dump.h>
147 #include <linux/sctp.h>
148 #include <net/udp_tunnel.h>
149 #include <linux/net_namespace.h>
150 #include <linux/indirect_call_wrapper.h>
151 #include <net/devlink.h>
152 #include <linux/pm_runtime.h>
153 #include <linux/prandom.h>
154 #include <linux/once_lite.h>
155 #include <net/netdev_rx_queue.h>
158 #include "net-sysfs.h"
160 static DEFINE_SPINLOCK(ptype_lock);
161 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
162 struct list_head ptype_all __read_mostly; /* Taps */
164 static int netif_rx_internal(struct sk_buff *skb);
165 static int call_netdevice_notifiers_extack(unsigned long val,
166 struct net_device *dev,
167 struct netlink_ext_ack *extack);
170 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
173 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
175 * Writers must hold the rtnl semaphore while they loop through the
176 * dev_base_head list, and hold dev_base_lock for writing when they do the
177 * actual updates. This allows pure readers to access the list even
178 * while a writer is preparing to update it.
180 * To put it another way, dev_base_lock is held for writing only to
181 * protect against pure readers; the rtnl semaphore provides the
182 * protection against other writers.
184 * See, for example usages, register_netdevice() and
185 * unregister_netdevice(), which must be called with the rtnl
188 DEFINE_RWLOCK(dev_base_lock);
189 EXPORT_SYMBOL(dev_base_lock);
191 static DEFINE_MUTEX(ifalias_mutex);
193 /* protects napi_hash addition/deletion and napi_gen_id */
194 static DEFINE_SPINLOCK(napi_hash_lock);
196 static unsigned int napi_gen_id = NR_CPUS;
197 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
199 static DECLARE_RWSEM(devnet_rename_sem);
201 static inline void dev_base_seq_inc(struct net *net)
203 while (++net->dev_base_seq == 0)
207 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
209 unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ));
211 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
214 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
216 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
219 static inline void rps_lock_irqsave(struct softnet_data *sd,
220 unsigned long *flags)
222 if (IS_ENABLED(CONFIG_RPS))
223 spin_lock_irqsave(&sd->input_pkt_queue.lock, *flags);
224 else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
225 local_irq_save(*flags);
228 static inline void rps_lock_irq_disable(struct softnet_data *sd)
230 if (IS_ENABLED(CONFIG_RPS))
231 spin_lock_irq(&sd->input_pkt_queue.lock);
232 else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
236 static inline void rps_unlock_irq_restore(struct softnet_data *sd,
237 unsigned long *flags)
239 if (IS_ENABLED(CONFIG_RPS))
240 spin_unlock_irqrestore(&sd->input_pkt_queue.lock, *flags);
241 else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
242 local_irq_restore(*flags);
245 static inline void rps_unlock_irq_enable(struct softnet_data *sd)
247 if (IS_ENABLED(CONFIG_RPS))
248 spin_unlock_irq(&sd->input_pkt_queue.lock);
249 else if (!IS_ENABLED(CONFIG_PREEMPT_RT))
253 static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev,
256 struct netdev_name_node *name_node;
258 name_node = kmalloc(sizeof(*name_node), GFP_KERNEL);
261 INIT_HLIST_NODE(&name_node->hlist);
262 name_node->dev = dev;
263 name_node->name = name;
267 static struct netdev_name_node *
268 netdev_name_node_head_alloc(struct net_device *dev)
270 struct netdev_name_node *name_node;
272 name_node = netdev_name_node_alloc(dev, dev->name);
275 INIT_LIST_HEAD(&name_node->list);
279 static void netdev_name_node_free(struct netdev_name_node *name_node)
284 static void netdev_name_node_add(struct net *net,
285 struct netdev_name_node *name_node)
287 hlist_add_head_rcu(&name_node->hlist,
288 dev_name_hash(net, name_node->name));
291 static void netdev_name_node_del(struct netdev_name_node *name_node)
293 hlist_del_rcu(&name_node->hlist);
296 static struct netdev_name_node *netdev_name_node_lookup(struct net *net,
299 struct hlist_head *head = dev_name_hash(net, name);
300 struct netdev_name_node *name_node;
302 hlist_for_each_entry(name_node, head, hlist)
303 if (!strcmp(name_node->name, name))
308 static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net,
311 struct hlist_head *head = dev_name_hash(net, name);
312 struct netdev_name_node *name_node;
314 hlist_for_each_entry_rcu(name_node, head, hlist)
315 if (!strcmp(name_node->name, name))
320 bool netdev_name_in_use(struct net *net, const char *name)
322 return netdev_name_node_lookup(net, name);
324 EXPORT_SYMBOL(netdev_name_in_use);
326 int netdev_name_node_alt_create(struct net_device *dev, const char *name)
328 struct netdev_name_node *name_node;
329 struct net *net = dev_net(dev);
331 name_node = netdev_name_node_lookup(net, name);
334 name_node = netdev_name_node_alloc(dev, name);
337 netdev_name_node_add(net, name_node);
338 /* The node that holds dev->name acts as a head of per-device list. */
339 list_add_tail_rcu(&name_node->list, &dev->name_node->list);
344 static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node)
346 list_del(&name_node->list);
347 kfree(name_node->name);
348 netdev_name_node_free(name_node);
351 int netdev_name_node_alt_destroy(struct net_device *dev, const char *name)
353 struct netdev_name_node *name_node;
354 struct net *net = dev_net(dev);
356 name_node = netdev_name_node_lookup(net, name);
359 /* lookup might have found our primary name or a name belonging
362 if (name_node == dev->name_node || name_node->dev != dev)
365 netdev_name_node_del(name_node);
367 __netdev_name_node_alt_destroy(name_node);
372 static void netdev_name_node_alt_flush(struct net_device *dev)
374 struct netdev_name_node *name_node, *tmp;
376 list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list)
377 __netdev_name_node_alt_destroy(name_node);
380 /* Device list insertion */
381 static void list_netdevice(struct net_device *dev)
383 struct netdev_name_node *name_node;
384 struct net *net = dev_net(dev);
388 write_lock(&dev_base_lock);
389 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
390 netdev_name_node_add(net, dev->name_node);
391 hlist_add_head_rcu(&dev->index_hlist,
392 dev_index_hash(net, dev->ifindex));
393 write_unlock(&dev_base_lock);
395 netdev_for_each_altname(dev, name_node)
396 netdev_name_node_add(net, name_node);
398 /* We reserved the ifindex, this can't fail */
399 WARN_ON(xa_store(&net->dev_by_index, dev->ifindex, dev, GFP_KERNEL));
401 dev_base_seq_inc(net);
404 /* Device list removal
405 * caller must respect a RCU grace period before freeing/reusing dev
407 static void unlist_netdevice(struct net_device *dev, bool lock)
409 struct netdev_name_node *name_node;
410 struct net *net = dev_net(dev);
414 xa_erase(&net->dev_by_index, dev->ifindex);
416 netdev_for_each_altname(dev, name_node)
417 netdev_name_node_del(name_node);
419 /* Unlink dev from the device chain */
421 write_lock(&dev_base_lock);
422 list_del_rcu(&dev->dev_list);
423 netdev_name_node_del(dev->name_node);
424 hlist_del_rcu(&dev->index_hlist);
426 write_unlock(&dev_base_lock);
428 dev_base_seq_inc(dev_net(dev));
435 static RAW_NOTIFIER_HEAD(netdev_chain);
438 * Device drivers call our routines to queue packets here. We empty the
439 * queue in the local softnet handler.
442 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
443 EXPORT_PER_CPU_SYMBOL(softnet_data);
445 #ifdef CONFIG_LOCKDEP
447 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
448 * according to dev->type
450 static const unsigned short netdev_lock_type[] = {
451 ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
452 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
453 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
454 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
455 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
456 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
457 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
458 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
459 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
460 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
461 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
462 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
463 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
464 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
465 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
467 static const char *const netdev_lock_name[] = {
468 "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
469 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
470 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
471 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
472 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
473 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
474 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
475 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
476 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
477 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
478 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
479 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
480 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
481 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
482 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
484 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
485 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
487 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
491 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
492 if (netdev_lock_type[i] == dev_type)
494 /* the last key is used by default */
495 return ARRAY_SIZE(netdev_lock_type) - 1;
498 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
499 unsigned short dev_type)
503 i = netdev_lock_pos(dev_type);
504 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
505 netdev_lock_name[i]);
508 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
512 i = netdev_lock_pos(dev->type);
513 lockdep_set_class_and_name(&dev->addr_list_lock,
514 &netdev_addr_lock_key[i],
515 netdev_lock_name[i]);
518 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
519 unsigned short dev_type)
523 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
528 /*******************************************************************************
530 * Protocol management and registration routines
532 *******************************************************************************/
536 * Add a protocol ID to the list. Now that the input handler is
537 * smarter we can dispense with all the messy stuff that used to be
540 * BEWARE!!! Protocol handlers, mangling input packets,
541 * MUST BE last in hash buckets and checking protocol handlers
542 * MUST start from promiscuous ptype_all chain in net_bh.
543 * It is true now, do not change it.
544 * Explanation follows: if protocol handler, mangling packet, will
545 * be the first on list, it is not able to sense, that packet
546 * is cloned and should be copied-on-write, so that it will
547 * change it and subsequent readers will get broken packet.
551 static inline struct list_head *ptype_head(const struct packet_type *pt)
553 if (pt->type == htons(ETH_P_ALL))
554 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
556 return pt->dev ? &pt->dev->ptype_specific :
557 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
561 * dev_add_pack - add packet handler
562 * @pt: packet type declaration
564 * Add a protocol handler to the networking stack. The passed &packet_type
565 * is linked into kernel lists and may not be freed until it has been
566 * removed from the kernel lists.
568 * This call does not sleep therefore it can not
569 * guarantee all CPU's that are in middle of receiving packets
570 * will see the new packet type (until the next received packet).
573 void dev_add_pack(struct packet_type *pt)
575 struct list_head *head = ptype_head(pt);
577 spin_lock(&ptype_lock);
578 list_add_rcu(&pt->list, head);
579 spin_unlock(&ptype_lock);
581 EXPORT_SYMBOL(dev_add_pack);
584 * __dev_remove_pack - remove packet handler
585 * @pt: packet type declaration
587 * Remove a protocol handler that was previously added to the kernel
588 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
589 * from the kernel lists and can be freed or reused once this function
592 * The packet type might still be in use by receivers
593 * and must not be freed until after all the CPU's have gone
594 * through a quiescent state.
596 void __dev_remove_pack(struct packet_type *pt)
598 struct list_head *head = ptype_head(pt);
599 struct packet_type *pt1;
601 spin_lock(&ptype_lock);
603 list_for_each_entry(pt1, head, list) {
605 list_del_rcu(&pt->list);
610 pr_warn("dev_remove_pack: %p not found\n", pt);
612 spin_unlock(&ptype_lock);
614 EXPORT_SYMBOL(__dev_remove_pack);
617 * dev_remove_pack - remove packet handler
618 * @pt: packet type declaration
620 * Remove a protocol handler that was previously added to the kernel
621 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
622 * from the kernel lists and can be freed or reused once this function
625 * This call sleeps to guarantee that no CPU is looking at the packet
628 void dev_remove_pack(struct packet_type *pt)
630 __dev_remove_pack(pt);
634 EXPORT_SYMBOL(dev_remove_pack);
637 /*******************************************************************************
639 * Device Interface Subroutines
641 *******************************************************************************/
644 * dev_get_iflink - get 'iflink' value of a interface
645 * @dev: targeted interface
647 * Indicates the ifindex the interface is linked to.
648 * Physical interfaces have the same 'ifindex' and 'iflink' values.
651 int dev_get_iflink(const struct net_device *dev)
653 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
654 return dev->netdev_ops->ndo_get_iflink(dev);
658 EXPORT_SYMBOL(dev_get_iflink);
661 * dev_fill_metadata_dst - Retrieve tunnel egress information.
662 * @dev: targeted interface
665 * For better visibility of tunnel traffic OVS needs to retrieve
666 * egress tunnel information for a packet. Following API allows
667 * user to get this info.
669 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
671 struct ip_tunnel_info *info;
673 if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst)
676 info = skb_tunnel_info_unclone(skb);
679 if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
682 return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
684 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
686 static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack)
688 int k = stack->num_paths++;
690 if (WARN_ON_ONCE(k >= NET_DEVICE_PATH_STACK_MAX))
693 return &stack->path[k];
696 int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
697 struct net_device_path_stack *stack)
699 const struct net_device *last_dev;
700 struct net_device_path_ctx ctx = {
703 struct net_device_path *path;
706 memcpy(ctx.daddr, daddr, sizeof(ctx.daddr));
707 stack->num_paths = 0;
708 while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) {
710 path = dev_fwd_path(stack);
714 memset(path, 0, sizeof(struct net_device_path));
715 ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path);
719 if (WARN_ON_ONCE(last_dev == ctx.dev))
726 path = dev_fwd_path(stack);
729 path->type = DEV_PATH_ETHERNET;
734 EXPORT_SYMBOL_GPL(dev_fill_forward_path);
737 * __dev_get_by_name - find a device by its name
738 * @net: the applicable net namespace
739 * @name: name to find
741 * Find an interface by name. Must be called under RTNL semaphore
742 * or @dev_base_lock. If the name is found a pointer to the device
743 * is returned. If the name is not found then %NULL is returned. The
744 * reference counters are not incremented so the caller must be
745 * careful with locks.
748 struct net_device *__dev_get_by_name(struct net *net, const char *name)
750 struct netdev_name_node *node_name;
752 node_name = netdev_name_node_lookup(net, name);
753 return node_name ? node_name->dev : NULL;
755 EXPORT_SYMBOL(__dev_get_by_name);
758 * dev_get_by_name_rcu - find a device by its name
759 * @net: the applicable net namespace
760 * @name: name to find
762 * Find an interface by name.
763 * If the name is found a pointer to the device is returned.
764 * If the name is not found then %NULL is returned.
765 * The reference counters are not incremented so the caller must be
766 * careful with locks. The caller must hold RCU lock.
769 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
771 struct netdev_name_node *node_name;
773 node_name = netdev_name_node_lookup_rcu(net, name);
774 return node_name ? node_name->dev : NULL;
776 EXPORT_SYMBOL(dev_get_by_name_rcu);
778 /* Deprecated for new users, call netdev_get_by_name() instead */
779 struct net_device *dev_get_by_name(struct net *net, const char *name)
781 struct net_device *dev;
784 dev = dev_get_by_name_rcu(net, name);
789 EXPORT_SYMBOL(dev_get_by_name);
792 * netdev_get_by_name() - find a device by its name
793 * @net: the applicable net namespace
794 * @name: name to find
795 * @tracker: tracking object for the acquired reference
796 * @gfp: allocation flags for the tracker
798 * Find an interface by name. This can be called from any
799 * context and does its own locking. The returned handle has
800 * the usage count incremented and the caller must use netdev_put() to
801 * release it when it is no longer needed. %NULL is returned if no
802 * matching device is found.
804 struct net_device *netdev_get_by_name(struct net *net, const char *name,
805 netdevice_tracker *tracker, gfp_t gfp)
807 struct net_device *dev;
809 dev = dev_get_by_name(net, name);
811 netdev_tracker_alloc(dev, tracker, gfp);
814 EXPORT_SYMBOL(netdev_get_by_name);
817 * __dev_get_by_index - find a device by its ifindex
818 * @net: the applicable net namespace
819 * @ifindex: index of device
821 * Search for an interface by index. Returns %NULL if the device
822 * is not found or a pointer to the device. The device has not
823 * had its reference counter increased so the caller must be careful
824 * about locking. The caller must hold either the RTNL semaphore
828 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
830 struct net_device *dev;
831 struct hlist_head *head = dev_index_hash(net, ifindex);
833 hlist_for_each_entry(dev, head, index_hlist)
834 if (dev->ifindex == ifindex)
839 EXPORT_SYMBOL(__dev_get_by_index);
842 * dev_get_by_index_rcu - find a device by its ifindex
843 * @net: the applicable net namespace
844 * @ifindex: index of device
846 * Search for an interface by index. Returns %NULL if the device
847 * is not found or a pointer to the device. The device has not
848 * had its reference counter increased so the caller must be careful
849 * about locking. The caller must hold RCU lock.
852 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
854 struct net_device *dev;
855 struct hlist_head *head = dev_index_hash(net, ifindex);
857 hlist_for_each_entry_rcu(dev, head, index_hlist)
858 if (dev->ifindex == ifindex)
863 EXPORT_SYMBOL(dev_get_by_index_rcu);
865 /* Deprecated for new users, call netdev_get_by_index() instead */
866 struct net_device *dev_get_by_index(struct net *net, int ifindex)
868 struct net_device *dev;
871 dev = dev_get_by_index_rcu(net, ifindex);
876 EXPORT_SYMBOL(dev_get_by_index);
879 * netdev_get_by_index() - find a device by its ifindex
880 * @net: the applicable net namespace
881 * @ifindex: index of device
882 * @tracker: tracking object for the acquired reference
883 * @gfp: allocation flags for the tracker
885 * Search for an interface by index. Returns NULL if the device
886 * is not found or a pointer to the device. The device returned has
887 * had a reference added and the pointer is safe until the user calls
888 * netdev_put() to indicate they have finished with it.
890 struct net_device *netdev_get_by_index(struct net *net, int ifindex,
891 netdevice_tracker *tracker, gfp_t gfp)
893 struct net_device *dev;
895 dev = dev_get_by_index(net, ifindex);
897 netdev_tracker_alloc(dev, tracker, gfp);
900 EXPORT_SYMBOL(netdev_get_by_index);
903 * dev_get_by_napi_id - find a device by napi_id
904 * @napi_id: ID of the NAPI struct
906 * Search for an interface by NAPI ID. Returns %NULL if the device
907 * is not found or a pointer to the device. The device has not had
908 * its reference counter increased so the caller must be careful
909 * about locking. The caller must hold RCU lock.
912 struct net_device *dev_get_by_napi_id(unsigned int napi_id)
914 struct napi_struct *napi;
916 WARN_ON_ONCE(!rcu_read_lock_held());
918 if (napi_id < MIN_NAPI_ID)
921 napi = napi_by_id(napi_id);
923 return napi ? napi->dev : NULL;
925 EXPORT_SYMBOL(dev_get_by_napi_id);
928 * netdev_get_name - get a netdevice name, knowing its ifindex.
929 * @net: network namespace
930 * @name: a pointer to the buffer where the name will be stored.
931 * @ifindex: the ifindex of the interface to get the name from.
933 int netdev_get_name(struct net *net, char *name, int ifindex)
935 struct net_device *dev;
938 down_read(&devnet_rename_sem);
941 dev = dev_get_by_index_rcu(net, ifindex);
947 strcpy(name, dev->name);
952 up_read(&devnet_rename_sem);
957 * dev_getbyhwaddr_rcu - find a device by its hardware address
958 * @net: the applicable net namespace
959 * @type: media type of device
960 * @ha: hardware address
962 * Search for an interface by MAC address. Returns NULL if the device
963 * is not found or a pointer to the device.
964 * The caller must hold RCU or RTNL.
965 * The returned device has not had its ref count increased
966 * and the caller must therefore be careful about locking
970 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
973 struct net_device *dev;
975 for_each_netdev_rcu(net, dev)
976 if (dev->type == type &&
977 !memcmp(dev->dev_addr, ha, dev->addr_len))
982 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
984 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
986 struct net_device *dev, *ret = NULL;
989 for_each_netdev_rcu(net, dev)
990 if (dev->type == type) {
998 EXPORT_SYMBOL(dev_getfirstbyhwtype);
1001 * __dev_get_by_flags - find any device with given flags
1002 * @net: the applicable net namespace
1003 * @if_flags: IFF_* values
1004 * @mask: bitmask of bits in if_flags to check
1006 * Search for any interface with the given flags. Returns NULL if a device
1007 * is not found or a pointer to the device. Must be called inside
1008 * rtnl_lock(), and result refcount is unchanged.
1011 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
1012 unsigned short mask)
1014 struct net_device *dev, *ret;
1019 for_each_netdev(net, dev) {
1020 if (((dev->flags ^ if_flags) & mask) == 0) {
1027 EXPORT_SYMBOL(__dev_get_by_flags);
1030 * dev_valid_name - check if name is okay for network device
1031 * @name: name string
1033 * Network device names need to be valid file names to
1034 * allow sysfs to work. We also disallow any kind of
1037 bool dev_valid_name(const char *name)
1041 if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
1043 if (!strcmp(name, ".") || !strcmp(name, ".."))
1047 if (*name == '/' || *name == ':' || isspace(*name))
1053 EXPORT_SYMBOL(dev_valid_name);
1056 * __dev_alloc_name - allocate a name for a device
1057 * @net: network namespace to allocate the device name in
1058 * @name: name format string
1059 * @res: result name string
1061 * Passed a format string - eg "lt%d" it will try and find a suitable
1062 * id. It scans list of devices to build up a free map, then chooses
1063 * the first empty slot. The caller must hold the dev_base or rtnl lock
1064 * while allocating the name and adding the device in order to avoid
1066 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1067 * Returns the number of the unit assigned or a negative errno code.
1070 static int __dev_alloc_name(struct net *net, const char *name, char *res)
1074 const int max_netdevices = 8*PAGE_SIZE;
1075 unsigned long *inuse;
1076 struct net_device *d;
1079 /* Verify the string as this thing may have come from the user.
1080 * There must be one "%d" and no other "%" characters.
1082 p = strchr(name, '%');
1083 if (!p || p[1] != 'd' || strchr(p + 2, '%'))
1086 /* Use one page as a bit array of possible slots */
1087 inuse = bitmap_zalloc(max_netdevices, GFP_ATOMIC);
1091 for_each_netdev(net, d) {
1092 struct netdev_name_node *name_node;
1094 netdev_for_each_altname(d, name_node) {
1095 if (!sscanf(name_node->name, name, &i))
1097 if (i < 0 || i >= max_netdevices)
1100 /* avoid cases where sscanf is not exact inverse of printf */
1101 snprintf(buf, IFNAMSIZ, name, i);
1102 if (!strncmp(buf, name_node->name, IFNAMSIZ))
1103 __set_bit(i, inuse);
1105 if (!sscanf(d->name, name, &i))
1107 if (i < 0 || i >= max_netdevices)
1110 /* avoid cases where sscanf is not exact inverse of printf */
1111 snprintf(buf, IFNAMSIZ, name, i);
1112 if (!strncmp(buf, d->name, IFNAMSIZ))
1113 __set_bit(i, inuse);
1116 i = find_first_zero_bit(inuse, max_netdevices);
1118 if (i == max_netdevices)
1121 /* 'res' and 'name' could overlap, use 'buf' as an intermediate buffer */
1122 strscpy(buf, name, IFNAMSIZ);
1123 snprintf(res, IFNAMSIZ, buf, i);
1127 /* Returns negative errno or allocated unit id (see __dev_alloc_name()) */
1128 static int dev_prep_valid_name(struct net *net, struct net_device *dev,
1129 const char *want_name, char *out_name,
1132 if (!dev_valid_name(want_name))
1135 if (strchr(want_name, '%'))
1136 return __dev_alloc_name(net, want_name, out_name);
1138 if (netdev_name_in_use(net, want_name))
1140 if (out_name != want_name)
1141 strscpy(out_name, want_name, IFNAMSIZ);
1146 * dev_alloc_name - allocate a name for a device
1148 * @name: name format string
1150 * Passed a format string - eg "lt%d" it will try and find a suitable
1151 * id. It scans list of devices to build up a free map, then chooses
1152 * the first empty slot. The caller must hold the dev_base or rtnl lock
1153 * while allocating the name and adding the device in order to avoid
1155 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1156 * Returns the number of the unit assigned or a negative errno code.
1159 int dev_alloc_name(struct net_device *dev, const char *name)
1161 return dev_prep_valid_name(dev_net(dev), dev, name, dev->name, ENFILE);
1163 EXPORT_SYMBOL(dev_alloc_name);
1165 static int dev_get_valid_name(struct net *net, struct net_device *dev,
1170 ret = dev_prep_valid_name(net, dev, name, dev->name, EEXIST);
1171 return ret < 0 ? ret : 0;
1175 * dev_change_name - change name of a device
1177 * @newname: name (or format string) must be at least IFNAMSIZ
1179 * Change name of a device, can pass format strings "eth%d".
1182 int dev_change_name(struct net_device *dev, const char *newname)
1184 unsigned char old_assign_type;
1185 char oldname[IFNAMSIZ];
1191 BUG_ON(!dev_net(dev));
1195 down_write(&devnet_rename_sem);
1197 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1198 up_write(&devnet_rename_sem);
1202 memcpy(oldname, dev->name, IFNAMSIZ);
1204 err = dev_get_valid_name(net, dev, newname);
1206 up_write(&devnet_rename_sem);
1210 if (oldname[0] && !strchr(oldname, '%'))
1211 netdev_info(dev, "renamed from %s%s\n", oldname,
1212 dev->flags & IFF_UP ? " (while UP)" : "");
1214 old_assign_type = dev->name_assign_type;
1215 dev->name_assign_type = NET_NAME_RENAMED;
1218 ret = device_rename(&dev->dev, dev->name);
1220 memcpy(dev->name, oldname, IFNAMSIZ);
1221 dev->name_assign_type = old_assign_type;
1222 up_write(&devnet_rename_sem);
1226 up_write(&devnet_rename_sem);
1228 netdev_adjacent_rename_links(dev, oldname);
1230 write_lock(&dev_base_lock);
1231 netdev_name_node_del(dev->name_node);
1232 write_unlock(&dev_base_lock);
1236 write_lock(&dev_base_lock);
1237 netdev_name_node_add(net, dev->name_node);
1238 write_unlock(&dev_base_lock);
1240 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1241 ret = notifier_to_errno(ret);
1244 /* err >= 0 after dev_alloc_name() or stores the first errno */
1247 down_write(&devnet_rename_sem);
1248 memcpy(dev->name, oldname, IFNAMSIZ);
1249 memcpy(oldname, newname, IFNAMSIZ);
1250 dev->name_assign_type = old_assign_type;
1251 old_assign_type = NET_NAME_RENAMED;
1254 netdev_err(dev, "name change rollback failed: %d\n",
1263 * dev_set_alias - change ifalias of a device
1265 * @alias: name up to IFALIASZ
1266 * @len: limit of bytes to copy from info
1268 * Set ifalias for a device,
1270 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1272 struct dev_ifalias *new_alias = NULL;
1274 if (len >= IFALIASZ)
1278 new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL);
1282 memcpy(new_alias->ifalias, alias, len);
1283 new_alias->ifalias[len] = 0;
1286 mutex_lock(&ifalias_mutex);
1287 new_alias = rcu_replace_pointer(dev->ifalias, new_alias,
1288 mutex_is_locked(&ifalias_mutex));
1289 mutex_unlock(&ifalias_mutex);
1292 kfree_rcu(new_alias, rcuhead);
1296 EXPORT_SYMBOL(dev_set_alias);
1299 * dev_get_alias - get ifalias of a device
1301 * @name: buffer to store name of ifalias
1302 * @len: size of buffer
1304 * get ifalias for a device. Caller must make sure dev cannot go
1305 * away, e.g. rcu read lock or own a reference count to device.
1307 int dev_get_alias(const struct net_device *dev, char *name, size_t len)
1309 const struct dev_ifalias *alias;
1313 alias = rcu_dereference(dev->ifalias);
1315 ret = snprintf(name, len, "%s", alias->ifalias);
1322 * netdev_features_change - device changes features
1323 * @dev: device to cause notification
1325 * Called to indicate a device has changed features.
1327 void netdev_features_change(struct net_device *dev)
1329 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1331 EXPORT_SYMBOL(netdev_features_change);
1334 * netdev_state_change - device changes state
1335 * @dev: device to cause notification
1337 * Called to indicate a device has changed state. This function calls
1338 * the notifier chains for netdev_chain and sends a NEWLINK message
1339 * to the routing socket.
1341 void netdev_state_change(struct net_device *dev)
1343 if (dev->flags & IFF_UP) {
1344 struct netdev_notifier_change_info change_info = {
1348 call_netdevice_notifiers_info(NETDEV_CHANGE,
1350 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL, 0, NULL);
1353 EXPORT_SYMBOL(netdev_state_change);
1356 * __netdev_notify_peers - notify network peers about existence of @dev,
1357 * to be called when rtnl lock is already held.
1358 * @dev: network device
1360 * Generate traffic such that interested network peers are aware of
1361 * @dev, such as by generating a gratuitous ARP. This may be used when
1362 * a device wants to inform the rest of the network about some sort of
1363 * reconfiguration such as a failover event or virtual machine
1366 void __netdev_notify_peers(struct net_device *dev)
1369 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1370 call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev);
1372 EXPORT_SYMBOL(__netdev_notify_peers);
1375 * netdev_notify_peers - notify network peers about existence of @dev
1376 * @dev: network device
1378 * Generate traffic such that interested network peers are aware of
1379 * @dev, such as by generating a gratuitous ARP. This may be used when
1380 * a device wants to inform the rest of the network about some sort of
1381 * reconfiguration such as a failover event or virtual machine
1384 void netdev_notify_peers(struct net_device *dev)
1387 __netdev_notify_peers(dev);
1390 EXPORT_SYMBOL(netdev_notify_peers);
1392 static int napi_threaded_poll(void *data);
1394 static int napi_kthread_create(struct napi_struct *n)
1398 /* Create and wake up the kthread once to put it in
1399 * TASK_INTERRUPTIBLE mode to avoid the blocked task
1400 * warning and work with loadavg.
1402 n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d",
1403 n->dev->name, n->napi_id);
1404 if (IS_ERR(n->thread)) {
1405 err = PTR_ERR(n->thread);
1406 pr_err("kthread_run failed with err %d\n", err);
1413 static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
1415 const struct net_device_ops *ops = dev->netdev_ops;
1419 dev_addr_check(dev);
1421 if (!netif_device_present(dev)) {
1422 /* may be detached because parent is runtime-suspended */
1423 if (dev->dev.parent)
1424 pm_runtime_resume(dev->dev.parent);
1425 if (!netif_device_present(dev))
1429 /* Block netpoll from trying to do any rx path servicing.
1430 * If we don't do this there is a chance ndo_poll_controller
1431 * or ndo_poll may be running while we open the device
1433 netpoll_poll_disable(dev);
1435 ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack);
1436 ret = notifier_to_errno(ret);
1440 set_bit(__LINK_STATE_START, &dev->state);
1442 if (ops->ndo_validate_addr)
1443 ret = ops->ndo_validate_addr(dev);
1445 if (!ret && ops->ndo_open)
1446 ret = ops->ndo_open(dev);
1448 netpoll_poll_enable(dev);
1451 clear_bit(__LINK_STATE_START, &dev->state);
1453 dev->flags |= IFF_UP;
1454 dev_set_rx_mode(dev);
1456 add_device_randomness(dev->dev_addr, dev->addr_len);
1463 * dev_open - prepare an interface for use.
1464 * @dev: device to open
1465 * @extack: netlink extended ack
1467 * Takes a device from down to up state. The device's private open
1468 * function is invoked and then the multicast lists are loaded. Finally
1469 * the device is moved into the up state and a %NETDEV_UP message is
1470 * sent to the netdev notifier chain.
1472 * Calling this function on an active interface is a nop. On a failure
1473 * a negative errno code is returned.
1475 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
1479 if (dev->flags & IFF_UP)
1482 ret = __dev_open(dev, extack);
1486 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP | IFF_RUNNING, GFP_KERNEL, 0, NULL);
1487 call_netdevice_notifiers(NETDEV_UP, dev);
1491 EXPORT_SYMBOL(dev_open);
1493 static void __dev_close_many(struct list_head *head)
1495 struct net_device *dev;
1500 list_for_each_entry(dev, head, close_list) {
1501 /* Temporarily disable netpoll until the interface is down */
1502 netpoll_poll_disable(dev);
1504 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1506 clear_bit(__LINK_STATE_START, &dev->state);
1508 /* Synchronize to scheduled poll. We cannot touch poll list, it
1509 * can be even on different cpu. So just clear netif_running().
1511 * dev->stop() will invoke napi_disable() on all of it's
1512 * napi_struct instances on this device.
1514 smp_mb__after_atomic(); /* Commit netif_running(). */
1517 dev_deactivate_many(head);
1519 list_for_each_entry(dev, head, close_list) {
1520 const struct net_device_ops *ops = dev->netdev_ops;
1523 * Call the device specific close. This cannot fail.
1524 * Only if device is UP
1526 * We allow it to be called even after a DETACH hot-plug
1532 dev->flags &= ~IFF_UP;
1533 netpoll_poll_enable(dev);
1537 static void __dev_close(struct net_device *dev)
1541 list_add(&dev->close_list, &single);
1542 __dev_close_many(&single);
1546 void dev_close_many(struct list_head *head, bool unlink)
1548 struct net_device *dev, *tmp;
1550 /* Remove the devices that don't need to be closed */
1551 list_for_each_entry_safe(dev, tmp, head, close_list)
1552 if (!(dev->flags & IFF_UP))
1553 list_del_init(&dev->close_list);
1555 __dev_close_many(head);
1557 list_for_each_entry_safe(dev, tmp, head, close_list) {
1558 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP | IFF_RUNNING, GFP_KERNEL, 0, NULL);
1559 call_netdevice_notifiers(NETDEV_DOWN, dev);
1561 list_del_init(&dev->close_list);
1564 EXPORT_SYMBOL(dev_close_many);
1567 * dev_close - shutdown an interface.
1568 * @dev: device to shutdown
1570 * This function moves an active device into down state. A
1571 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1572 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1575 void dev_close(struct net_device *dev)
1577 if (dev->flags & IFF_UP) {
1580 list_add(&dev->close_list, &single);
1581 dev_close_many(&single, true);
1585 EXPORT_SYMBOL(dev_close);
1589 * dev_disable_lro - disable Large Receive Offload on a device
1592 * Disable Large Receive Offload (LRO) on a net device. Must be
1593 * called under RTNL. This is needed if received packets may be
1594 * forwarded to another interface.
1596 void dev_disable_lro(struct net_device *dev)
1598 struct net_device *lower_dev;
1599 struct list_head *iter;
1601 dev->wanted_features &= ~NETIF_F_LRO;
1602 netdev_update_features(dev);
1604 if (unlikely(dev->features & NETIF_F_LRO))
1605 netdev_WARN(dev, "failed to disable LRO!\n");
1607 netdev_for_each_lower_dev(dev, lower_dev, iter)
1608 dev_disable_lro(lower_dev);
1610 EXPORT_SYMBOL(dev_disable_lro);
1613 * dev_disable_gro_hw - disable HW Generic Receive Offload on a device
1616 * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be
1617 * called under RTNL. This is needed if Generic XDP is installed on
1620 static void dev_disable_gro_hw(struct net_device *dev)
1622 dev->wanted_features &= ~NETIF_F_GRO_HW;
1623 netdev_update_features(dev);
1625 if (unlikely(dev->features & NETIF_F_GRO_HW))
1626 netdev_WARN(dev, "failed to disable GRO_HW!\n");
1629 const char *netdev_cmd_to_name(enum netdev_cmd cmd)
1632 case NETDEV_##val: \
1633 return "NETDEV_" __stringify(val);
1635 N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER)
1636 N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE)
1637 N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE)
1638 N(POST_INIT) N(PRE_UNINIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN)
1639 N(CHANGEUPPER) N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA)
1640 N(BONDING_INFO) N(PRECHANGEUPPER) N(CHANGELOWERSTATE)
1641 N(UDP_TUNNEL_PUSH_INFO) N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
1642 N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO)
1643 N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO)
1644 N(PRE_CHANGEADDR) N(OFFLOAD_XSTATS_ENABLE) N(OFFLOAD_XSTATS_DISABLE)
1645 N(OFFLOAD_XSTATS_REPORT_USED) N(OFFLOAD_XSTATS_REPORT_DELTA)
1649 return "UNKNOWN_NETDEV_EVENT";
1651 EXPORT_SYMBOL_GPL(netdev_cmd_to_name);
1653 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1654 struct net_device *dev)
1656 struct netdev_notifier_info info = {
1660 return nb->notifier_call(nb, val, &info);
1663 static int call_netdevice_register_notifiers(struct notifier_block *nb,
1664 struct net_device *dev)
1668 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1669 err = notifier_to_errno(err);
1673 if (!(dev->flags & IFF_UP))
1676 call_netdevice_notifier(nb, NETDEV_UP, dev);
1680 static void call_netdevice_unregister_notifiers(struct notifier_block *nb,
1681 struct net_device *dev)
1683 if (dev->flags & IFF_UP) {
1684 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1686 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1688 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1691 static int call_netdevice_register_net_notifiers(struct notifier_block *nb,
1694 struct net_device *dev;
1697 for_each_netdev(net, dev) {
1698 err = call_netdevice_register_notifiers(nb, dev);
1705 for_each_netdev_continue_reverse(net, dev)
1706 call_netdevice_unregister_notifiers(nb, dev);
1710 static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb,
1713 struct net_device *dev;
1715 for_each_netdev(net, dev)
1716 call_netdevice_unregister_notifiers(nb, dev);
1719 static int dev_boot_phase = 1;
1722 * register_netdevice_notifier - register a network notifier block
1725 * Register a notifier to be called when network device events occur.
1726 * The notifier passed is linked into the kernel structures and must
1727 * not be reused until it has been unregistered. A negative errno code
1728 * is returned on a failure.
1730 * When registered all registration and up events are replayed
1731 * to the new notifier to allow device to have a race free
1732 * view of the network device list.
1735 int register_netdevice_notifier(struct notifier_block *nb)
1740 /* Close race with setup_net() and cleanup_net() */
1741 down_write(&pernet_ops_rwsem);
1743 err = raw_notifier_chain_register(&netdev_chain, nb);
1749 err = call_netdevice_register_net_notifiers(nb, net);
1756 up_write(&pernet_ops_rwsem);
1760 for_each_net_continue_reverse(net)
1761 call_netdevice_unregister_net_notifiers(nb, net);
1763 raw_notifier_chain_unregister(&netdev_chain, nb);
1766 EXPORT_SYMBOL(register_netdevice_notifier);
1769 * unregister_netdevice_notifier - unregister a network notifier block
1772 * Unregister a notifier previously registered by
1773 * register_netdevice_notifier(). The notifier is unlinked into the
1774 * kernel structures and may then be reused. A negative errno code
1775 * is returned on a failure.
1777 * After unregistering unregister and down device events are synthesized
1778 * for all devices on the device list to the removed notifier to remove
1779 * the need for special case cleanup code.
1782 int unregister_netdevice_notifier(struct notifier_block *nb)
1787 /* Close race with setup_net() and cleanup_net() */
1788 down_write(&pernet_ops_rwsem);
1790 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1795 call_netdevice_unregister_net_notifiers(nb, net);
1799 up_write(&pernet_ops_rwsem);
1802 EXPORT_SYMBOL(unregister_netdevice_notifier);
1804 static int __register_netdevice_notifier_net(struct net *net,
1805 struct notifier_block *nb,
1806 bool ignore_call_fail)
1810 err = raw_notifier_chain_register(&net->netdev_chain, nb);
1816 err = call_netdevice_register_net_notifiers(nb, net);
1817 if (err && !ignore_call_fail)
1818 goto chain_unregister;
1823 raw_notifier_chain_unregister(&net->netdev_chain, nb);
1827 static int __unregister_netdevice_notifier_net(struct net *net,
1828 struct notifier_block *nb)
1832 err = raw_notifier_chain_unregister(&net->netdev_chain, nb);
1836 call_netdevice_unregister_net_notifiers(nb, net);
1841 * register_netdevice_notifier_net - register a per-netns network notifier block
1842 * @net: network namespace
1845 * Register a notifier to be called when network device events occur.
1846 * The notifier passed is linked into the kernel structures and must
1847 * not be reused until it has been unregistered. A negative errno code
1848 * is returned on a failure.
1850 * When registered all registration and up events are replayed
1851 * to the new notifier to allow device to have a race free
1852 * view of the network device list.
1855 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb)
1860 err = __register_netdevice_notifier_net(net, nb, false);
1864 EXPORT_SYMBOL(register_netdevice_notifier_net);
1867 * unregister_netdevice_notifier_net - unregister a per-netns
1868 * network notifier block
1869 * @net: network namespace
1872 * Unregister a notifier previously registered by
1873 * register_netdevice_notifier_net(). The notifier is unlinked from the
1874 * kernel structures and may then be reused. A negative errno code
1875 * is returned on a failure.
1877 * After unregistering unregister and down device events are synthesized
1878 * for all devices on the device list to the removed notifier to remove
1879 * the need for special case cleanup code.
1882 int unregister_netdevice_notifier_net(struct net *net,
1883 struct notifier_block *nb)
1888 err = __unregister_netdevice_notifier_net(net, nb);
1892 EXPORT_SYMBOL(unregister_netdevice_notifier_net);
1894 static void __move_netdevice_notifier_net(struct net *src_net,
1895 struct net *dst_net,
1896 struct notifier_block *nb)
1898 __unregister_netdevice_notifier_net(src_net, nb);
1899 __register_netdevice_notifier_net(dst_net, nb, true);
1902 int register_netdevice_notifier_dev_net(struct net_device *dev,
1903 struct notifier_block *nb,
1904 struct netdev_net_notifier *nn)
1909 err = __register_netdevice_notifier_net(dev_net(dev), nb, false);
1912 list_add(&nn->list, &dev->net_notifier_list);
1917 EXPORT_SYMBOL(register_netdevice_notifier_dev_net);
1919 int unregister_netdevice_notifier_dev_net(struct net_device *dev,
1920 struct notifier_block *nb,
1921 struct netdev_net_notifier *nn)
1926 list_del(&nn->list);
1927 err = __unregister_netdevice_notifier_net(dev_net(dev), nb);
1931 EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net);
1933 static void move_netdevice_notifiers_dev_net(struct net_device *dev,
1936 struct netdev_net_notifier *nn;
1938 list_for_each_entry(nn, &dev->net_notifier_list, list)
1939 __move_netdevice_notifier_net(dev_net(dev), net, nn->nb);
1943 * call_netdevice_notifiers_info - call all network notifier blocks
1944 * @val: value passed unmodified to notifier function
1945 * @info: notifier information data
1947 * Call all network notifier blocks. Parameters and return value
1948 * are as for raw_notifier_call_chain().
1951 int call_netdevice_notifiers_info(unsigned long val,
1952 struct netdev_notifier_info *info)
1954 struct net *net = dev_net(info->dev);
1959 /* Run per-netns notifier block chain first, then run the global one.
1960 * Hopefully, one day, the global one is going to be removed after
1961 * all notifier block registrators get converted to be per-netns.
1963 ret = raw_notifier_call_chain(&net->netdev_chain, val, info);
1964 if (ret & NOTIFY_STOP_MASK)
1966 return raw_notifier_call_chain(&netdev_chain, val, info);
1970 * call_netdevice_notifiers_info_robust - call per-netns notifier blocks
1971 * for and rollback on error
1972 * @val_up: value passed unmodified to notifier function
1973 * @val_down: value passed unmodified to the notifier function when
1974 * recovering from an error on @val_up
1975 * @info: notifier information data
1977 * Call all per-netns network notifier blocks, but not notifier blocks on
1978 * the global notifier chain. Parameters and return value are as for
1979 * raw_notifier_call_chain_robust().
1983 call_netdevice_notifiers_info_robust(unsigned long val_up,
1984 unsigned long val_down,
1985 struct netdev_notifier_info *info)
1987 struct net *net = dev_net(info->dev);
1991 return raw_notifier_call_chain_robust(&net->netdev_chain,
1992 val_up, val_down, info);
1995 static int call_netdevice_notifiers_extack(unsigned long val,
1996 struct net_device *dev,
1997 struct netlink_ext_ack *extack)
1999 struct netdev_notifier_info info = {
2004 return call_netdevice_notifiers_info(val, &info);
2008 * call_netdevice_notifiers - call all network notifier blocks
2009 * @val: value passed unmodified to notifier function
2010 * @dev: net_device pointer passed unmodified to notifier function
2012 * Call all network notifier blocks. Parameters and return value
2013 * are as for raw_notifier_call_chain().
2016 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
2018 return call_netdevice_notifiers_extack(val, dev, NULL);
2020 EXPORT_SYMBOL(call_netdevice_notifiers);
2023 * call_netdevice_notifiers_mtu - call all network notifier blocks
2024 * @val: value passed unmodified to notifier function
2025 * @dev: net_device pointer passed unmodified to notifier function
2026 * @arg: additional u32 argument passed to the notifier function
2028 * Call all network notifier blocks. Parameters and return value
2029 * are as for raw_notifier_call_chain().
2031 static int call_netdevice_notifiers_mtu(unsigned long val,
2032 struct net_device *dev, u32 arg)
2034 struct netdev_notifier_info_ext info = {
2039 BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0);
2041 return call_netdevice_notifiers_info(val, &info.info);
2044 #ifdef CONFIG_NET_INGRESS
2045 static DEFINE_STATIC_KEY_FALSE(ingress_needed_key);
2047 void net_inc_ingress_queue(void)
2049 static_branch_inc(&ingress_needed_key);
2051 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
2053 void net_dec_ingress_queue(void)
2055 static_branch_dec(&ingress_needed_key);
2057 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
2060 #ifdef CONFIG_NET_EGRESS
2061 static DEFINE_STATIC_KEY_FALSE(egress_needed_key);
2063 void net_inc_egress_queue(void)
2065 static_branch_inc(&egress_needed_key);
2067 EXPORT_SYMBOL_GPL(net_inc_egress_queue);
2069 void net_dec_egress_queue(void)
2071 static_branch_dec(&egress_needed_key);
2073 EXPORT_SYMBOL_GPL(net_dec_egress_queue);
2076 DEFINE_STATIC_KEY_FALSE(netstamp_needed_key);
2077 EXPORT_SYMBOL(netstamp_needed_key);
2078 #ifdef CONFIG_JUMP_LABEL
2079 static atomic_t netstamp_needed_deferred;
2080 static atomic_t netstamp_wanted;
2081 static void netstamp_clear(struct work_struct *work)
2083 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
2086 wanted = atomic_add_return(deferred, &netstamp_wanted);
2088 static_branch_enable(&netstamp_needed_key);
2090 static_branch_disable(&netstamp_needed_key);
2092 static DECLARE_WORK(netstamp_work, netstamp_clear);
2095 void net_enable_timestamp(void)
2097 #ifdef CONFIG_JUMP_LABEL
2098 int wanted = atomic_read(&netstamp_wanted);
2100 while (wanted > 0) {
2101 if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted + 1))
2104 atomic_inc(&netstamp_needed_deferred);
2105 schedule_work(&netstamp_work);
2107 static_branch_inc(&netstamp_needed_key);
2110 EXPORT_SYMBOL(net_enable_timestamp);
2112 void net_disable_timestamp(void)
2114 #ifdef CONFIG_JUMP_LABEL
2115 int wanted = atomic_read(&netstamp_wanted);
2117 while (wanted > 1) {
2118 if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted - 1))
2121 atomic_dec(&netstamp_needed_deferred);
2122 schedule_work(&netstamp_work);
2124 static_branch_dec(&netstamp_needed_key);
2127 EXPORT_SYMBOL(net_disable_timestamp);
2129 static inline void net_timestamp_set(struct sk_buff *skb)
2132 skb->mono_delivery_time = 0;
2133 if (static_branch_unlikely(&netstamp_needed_key))
2134 skb->tstamp = ktime_get_real();
2137 #define net_timestamp_check(COND, SKB) \
2138 if (static_branch_unlikely(&netstamp_needed_key)) { \
2139 if ((COND) && !(SKB)->tstamp) \
2140 (SKB)->tstamp = ktime_get_real(); \
2143 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
2145 return __is_skb_forwardable(dev, skb, true);
2147 EXPORT_SYMBOL_GPL(is_skb_forwardable);
2149 static int __dev_forward_skb2(struct net_device *dev, struct sk_buff *skb,
2152 int ret = ____dev_forward_skb(dev, skb, check_mtu);
2155 skb->protocol = eth_type_trans(skb, dev);
2156 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
2162 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
2164 return __dev_forward_skb2(dev, skb, true);
2166 EXPORT_SYMBOL_GPL(__dev_forward_skb);
2169 * dev_forward_skb - loopback an skb to another netif
2171 * @dev: destination network device
2172 * @skb: buffer to forward
2175 * NET_RX_SUCCESS (no congestion)
2176 * NET_RX_DROP (packet was dropped, but freed)
2178 * dev_forward_skb can be used for injecting an skb from the
2179 * start_xmit function of one device into the receive queue
2180 * of another device.
2182 * The receiving device may be in another namespace, so
2183 * we have to clear all information in the skb that could
2184 * impact namespace isolation.
2186 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
2188 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
2190 EXPORT_SYMBOL_GPL(dev_forward_skb);
2192 int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb)
2194 return __dev_forward_skb2(dev, skb, false) ?: netif_rx_internal(skb);
2197 static inline int deliver_skb(struct sk_buff *skb,
2198 struct packet_type *pt_prev,
2199 struct net_device *orig_dev)
2201 if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
2203 refcount_inc(&skb->users);
2204 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2207 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
2208 struct packet_type **pt,
2209 struct net_device *orig_dev,
2211 struct list_head *ptype_list)
2213 struct packet_type *ptype, *pt_prev = *pt;
2215 list_for_each_entry_rcu(ptype, ptype_list, list) {
2216 if (ptype->type != type)
2219 deliver_skb(skb, pt_prev, orig_dev);
2225 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
2227 if (!ptype->af_packet_priv || !skb->sk)
2230 if (ptype->id_match)
2231 return ptype->id_match(ptype, skb->sk);
2232 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
2239 * dev_nit_active - return true if any network interface taps are in use
2241 * @dev: network device to check for the presence of taps
2243 bool dev_nit_active(struct net_device *dev)
2245 return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all);
2247 EXPORT_SYMBOL_GPL(dev_nit_active);
2250 * Support routine. Sends outgoing frames to any network
2251 * taps currently in use.
2254 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
2256 struct packet_type *ptype;
2257 struct sk_buff *skb2 = NULL;
2258 struct packet_type *pt_prev = NULL;
2259 struct list_head *ptype_list = &ptype_all;
2263 list_for_each_entry_rcu(ptype, ptype_list, list) {
2264 if (ptype->ignore_outgoing)
2267 /* Never send packets back to the socket
2268 * they originated from - MvS (miquels@drinkel.ow.org)
2270 if (skb_loop_sk(ptype, skb))
2274 deliver_skb(skb2, pt_prev, skb->dev);
2279 /* need to clone skb, done only once */
2280 skb2 = skb_clone(skb, GFP_ATOMIC);
2284 net_timestamp_set(skb2);
2286 /* skb->nh should be correctly
2287 * set by sender, so that the second statement is
2288 * just protection against buggy protocols.
2290 skb_reset_mac_header(skb2);
2292 if (skb_network_header(skb2) < skb2->data ||
2293 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
2294 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
2295 ntohs(skb2->protocol),
2297 skb_reset_network_header(skb2);
2300 skb2->transport_header = skb2->network_header;
2301 skb2->pkt_type = PACKET_OUTGOING;
2305 if (ptype_list == &ptype_all) {
2306 ptype_list = &dev->ptype_all;
2311 if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC))
2312 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
2318 EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);
2321 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
2322 * @dev: Network device
2323 * @txq: number of queues available
2325 * If real_num_tx_queues is changed the tc mappings may no longer be
2326 * valid. To resolve this verify the tc mapping remains valid and if
2327 * not NULL the mapping. With no priorities mapping to this
2328 * offset/count pair it will no longer be used. In the worst case TC0
2329 * is invalid nothing can be done so disable priority mappings. If is
2330 * expected that drivers will fix this mapping if they can before
2331 * calling netif_set_real_num_tx_queues.
2333 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
2336 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
2338 /* If TC0 is invalidated disable TC mapping */
2339 if (tc->offset + tc->count > txq) {
2340 netdev_warn(dev, "Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
2345 /* Invalidated prio to tc mappings set to TC0 */
2346 for (i = 1; i < TC_BITMASK + 1; i++) {
2347 int q = netdev_get_prio_tc_map(dev, i);
2349 tc = &dev->tc_to_txq[q];
2350 if (tc->offset + tc->count > txq) {
2351 netdev_warn(dev, "Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
2353 netdev_set_prio_tc_map(dev, i, 0);
2358 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq)
2361 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
2364 /* walk through the TCs and see if it falls into any of them */
2365 for (i = 0; i < TC_MAX_QUEUE; i++, tc++) {
2366 if ((txq - tc->offset) < tc->count)
2370 /* didn't find it, just return -1 to indicate no match */
2376 EXPORT_SYMBOL(netdev_txq_to_tc);
2379 static struct static_key xps_needed __read_mostly;
2380 static struct static_key xps_rxqs_needed __read_mostly;
2381 static DEFINE_MUTEX(xps_map_mutex);
2382 #define xmap_dereference(P) \
2383 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
2385 static bool remove_xps_queue(struct xps_dev_maps *dev_maps,
2386 struct xps_dev_maps *old_maps, int tci, u16 index)
2388 struct xps_map *map = NULL;
2391 map = xmap_dereference(dev_maps->attr_map[tci]);
2395 for (pos = map->len; pos--;) {
2396 if (map->queues[pos] != index)
2400 map->queues[pos] = map->queues[--map->len];
2405 RCU_INIT_POINTER(old_maps->attr_map[tci], NULL);
2406 RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL);
2407 kfree_rcu(map, rcu);
2414 static bool remove_xps_queue_cpu(struct net_device *dev,
2415 struct xps_dev_maps *dev_maps,
2416 int cpu, u16 offset, u16 count)
2418 int num_tc = dev_maps->num_tc;
2419 bool active = false;
2422 for (tci = cpu * num_tc; num_tc--; tci++) {
2425 for (i = count, j = offset; i--; j++) {
2426 if (!remove_xps_queue(dev_maps, NULL, tci, j))
2436 static void reset_xps_maps(struct net_device *dev,
2437 struct xps_dev_maps *dev_maps,
2438 enum xps_map_type type)
2440 static_key_slow_dec_cpuslocked(&xps_needed);
2441 if (type == XPS_RXQS)
2442 static_key_slow_dec_cpuslocked(&xps_rxqs_needed);
2444 RCU_INIT_POINTER(dev->xps_maps[type], NULL);
2446 kfree_rcu(dev_maps, rcu);
2449 static void clean_xps_maps(struct net_device *dev, enum xps_map_type type,
2450 u16 offset, u16 count)
2452 struct xps_dev_maps *dev_maps;
2453 bool active = false;
2456 dev_maps = xmap_dereference(dev->xps_maps[type]);
2460 for (j = 0; j < dev_maps->nr_ids; j++)
2461 active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, count);
2463 reset_xps_maps(dev, dev_maps, type);
2465 if (type == XPS_CPUS) {
2466 for (i = offset + (count - 1); count--; i--)
2467 netdev_queue_numa_node_write(
2468 netdev_get_tx_queue(dev, i), NUMA_NO_NODE);
2472 static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
2475 if (!static_key_false(&xps_needed))
2479 mutex_lock(&xps_map_mutex);
2481 if (static_key_false(&xps_rxqs_needed))
2482 clean_xps_maps(dev, XPS_RXQS, offset, count);
2484 clean_xps_maps(dev, XPS_CPUS, offset, count);
2486 mutex_unlock(&xps_map_mutex);
2490 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
2492 netif_reset_xps_queues(dev, index, dev->num_tx_queues - index);
2495 static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index,
2496 u16 index, bool is_rxqs_map)
2498 struct xps_map *new_map;
2499 int alloc_len = XPS_MIN_MAP_ALLOC;
2502 for (pos = 0; map && pos < map->len; pos++) {
2503 if (map->queues[pos] != index)
2508 /* Need to add tx-queue to this CPU's/rx-queue's existing map */
2510 if (pos < map->alloc_len)
2513 alloc_len = map->alloc_len * 2;
2516 /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's
2520 new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL);
2522 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
2523 cpu_to_node(attr_index));
2527 for (i = 0; i < pos; i++)
2528 new_map->queues[i] = map->queues[i];
2529 new_map->alloc_len = alloc_len;
2535 /* Copy xps maps at a given index */
2536 static void xps_copy_dev_maps(struct xps_dev_maps *dev_maps,
2537 struct xps_dev_maps *new_dev_maps, int index,
2538 int tc, bool skip_tc)
2540 int i, tci = index * dev_maps->num_tc;
2541 struct xps_map *map;
2543 /* copy maps belonging to foreign traffic classes */
2544 for (i = 0; i < dev_maps->num_tc; i++, tci++) {
2545 if (i == tc && skip_tc)
2548 /* fill in the new device map from the old device map */
2549 map = xmap_dereference(dev_maps->attr_map[tci]);
2550 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2554 /* Must be called under cpus_read_lock */
2555 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
2556 u16 index, enum xps_map_type type)
2558 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL, *old_dev_maps = NULL;
2559 const unsigned long *online_mask = NULL;
2560 bool active = false, copy = false;
2561 int i, j, tci, numa_node_id = -2;
2562 int maps_sz, num_tc = 1, tc = 0;
2563 struct xps_map *map, *new_map;
2564 unsigned int nr_ids;
2566 WARN_ON_ONCE(index >= dev->num_tx_queues);
2569 /* Do not allow XPS on subordinate device directly */
2570 num_tc = dev->num_tc;
2574 /* If queue belongs to subordinate dev use its map */
2575 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
2577 tc = netdev_txq_to_tc(dev, index);
2582 mutex_lock(&xps_map_mutex);
2584 dev_maps = xmap_dereference(dev->xps_maps[type]);
2585 if (type == XPS_RXQS) {
2586 maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues);
2587 nr_ids = dev->num_rx_queues;
2589 maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc);
2590 if (num_possible_cpus() > 1)
2591 online_mask = cpumask_bits(cpu_online_mask);
2592 nr_ids = nr_cpu_ids;
2595 if (maps_sz < L1_CACHE_BYTES)
2596 maps_sz = L1_CACHE_BYTES;
2598 /* The old dev_maps could be larger or smaller than the one we're
2599 * setting up now, as dev->num_tc or nr_ids could have been updated in
2600 * between. We could try to be smart, but let's be safe instead and only
2601 * copy foreign traffic classes if the two map sizes match.
2604 dev_maps->num_tc == num_tc && dev_maps->nr_ids == nr_ids)
2607 /* allocate memory for queue storage */
2608 for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids),
2610 if (!new_dev_maps) {
2611 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2612 if (!new_dev_maps) {
2613 mutex_unlock(&xps_map_mutex);
2617 new_dev_maps->nr_ids = nr_ids;
2618 new_dev_maps->num_tc = num_tc;
2621 tci = j * num_tc + tc;
2622 map = copy ? xmap_dereference(dev_maps->attr_map[tci]) : NULL;
2624 map = expand_xps_map(map, j, index, type == XPS_RXQS);
2628 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2632 goto out_no_new_maps;
2635 /* Increment static keys at most once per type */
2636 static_key_slow_inc_cpuslocked(&xps_needed);
2637 if (type == XPS_RXQS)
2638 static_key_slow_inc_cpuslocked(&xps_rxqs_needed);
2641 for (j = 0; j < nr_ids; j++) {
2642 bool skip_tc = false;
2644 tci = j * num_tc + tc;
2645 if (netif_attr_test_mask(j, mask, nr_ids) &&
2646 netif_attr_test_online(j, online_mask, nr_ids)) {
2647 /* add tx-queue to CPU/rx-queue maps */
2652 map = xmap_dereference(new_dev_maps->attr_map[tci]);
2653 while ((pos < map->len) && (map->queues[pos] != index))
2656 if (pos == map->len)
2657 map->queues[map->len++] = index;
2659 if (type == XPS_CPUS) {
2660 if (numa_node_id == -2)
2661 numa_node_id = cpu_to_node(j);
2662 else if (numa_node_id != cpu_to_node(j))
2669 xps_copy_dev_maps(dev_maps, new_dev_maps, j, tc,
2673 rcu_assign_pointer(dev->xps_maps[type], new_dev_maps);
2675 /* Cleanup old maps */
2677 goto out_no_old_maps;
2679 for (j = 0; j < dev_maps->nr_ids; j++) {
2680 for (i = num_tc, tci = j * dev_maps->num_tc; i--; tci++) {
2681 map = xmap_dereference(dev_maps->attr_map[tci]);
2686 new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
2691 RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL);
2692 kfree_rcu(map, rcu);
2696 old_dev_maps = dev_maps;
2699 dev_maps = new_dev_maps;
2703 if (type == XPS_CPUS)
2704 /* update Tx queue numa node */
2705 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2706 (numa_node_id >= 0) ?
2707 numa_node_id : NUMA_NO_NODE);
2712 /* removes tx-queue from unused CPUs/rx-queues */
2713 for (j = 0; j < dev_maps->nr_ids; j++) {
2714 tci = j * dev_maps->num_tc;
2716 for (i = 0; i < dev_maps->num_tc; i++, tci++) {
2718 netif_attr_test_mask(j, mask, dev_maps->nr_ids) &&
2719 netif_attr_test_online(j, online_mask, dev_maps->nr_ids))
2722 active |= remove_xps_queue(dev_maps,
2723 copy ? old_dev_maps : NULL,
2729 kfree_rcu(old_dev_maps, rcu);
2731 /* free map if not active */
2733 reset_xps_maps(dev, dev_maps, type);
2736 mutex_unlock(&xps_map_mutex);
2740 /* remove any maps that we added */
2741 for (j = 0; j < nr_ids; j++) {
2742 for (i = num_tc, tci = j * num_tc; i--; tci++) {
2743 new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
2745 xmap_dereference(dev_maps->attr_map[tci]) :
2747 if (new_map && new_map != map)
2752 mutex_unlock(&xps_map_mutex);
2754 kfree(new_dev_maps);
2757 EXPORT_SYMBOL_GPL(__netif_set_xps_queue);
2759 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2765 ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, XPS_CPUS);
2770 EXPORT_SYMBOL(netif_set_xps_queue);
2773 static void netdev_unbind_all_sb_channels(struct net_device *dev)
2775 struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
2777 /* Unbind any subordinate channels */
2778 while (txq-- != &dev->_tx[0]) {
2780 netdev_unbind_sb_channel(dev, txq->sb_dev);
2784 void netdev_reset_tc(struct net_device *dev)
2787 netif_reset_xps_queues_gt(dev, 0);
2789 netdev_unbind_all_sb_channels(dev);
2791 /* Reset TC configuration of device */
2793 memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
2794 memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
2796 EXPORT_SYMBOL(netdev_reset_tc);
2798 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
2800 if (tc >= dev->num_tc)
2804 netif_reset_xps_queues(dev, offset, count);
2806 dev->tc_to_txq[tc].count = count;
2807 dev->tc_to_txq[tc].offset = offset;
2810 EXPORT_SYMBOL(netdev_set_tc_queue);
2812 int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
2814 if (num_tc > TC_MAX_QUEUE)
2818 netif_reset_xps_queues_gt(dev, 0);
2820 netdev_unbind_all_sb_channels(dev);
2822 dev->num_tc = num_tc;
2825 EXPORT_SYMBOL(netdev_set_num_tc);
2827 void netdev_unbind_sb_channel(struct net_device *dev,
2828 struct net_device *sb_dev)
2830 struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
2833 netif_reset_xps_queues_gt(sb_dev, 0);
2835 memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq));
2836 memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map));
2838 while (txq-- != &dev->_tx[0]) {
2839 if (txq->sb_dev == sb_dev)
2843 EXPORT_SYMBOL(netdev_unbind_sb_channel);
2845 int netdev_bind_sb_channel_queue(struct net_device *dev,
2846 struct net_device *sb_dev,
2847 u8 tc, u16 count, u16 offset)
2849 /* Make certain the sb_dev and dev are already configured */
2850 if (sb_dev->num_tc >= 0 || tc >= dev->num_tc)
2853 /* We cannot hand out queues we don't have */
2854 if ((offset + count) > dev->real_num_tx_queues)
2857 /* Record the mapping */
2858 sb_dev->tc_to_txq[tc].count = count;
2859 sb_dev->tc_to_txq[tc].offset = offset;
2861 /* Provide a way for Tx queue to find the tc_to_txq map or
2862 * XPS map for itself.
2865 netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev;
2869 EXPORT_SYMBOL(netdev_bind_sb_channel_queue);
2871 int netdev_set_sb_channel(struct net_device *dev, u16 channel)
2873 /* Do not use a multiqueue device to represent a subordinate channel */
2874 if (netif_is_multiqueue(dev))
2877 /* We allow channels 1 - 32767 to be used for subordinate channels.
2878 * Channel 0 is meant to be "native" mode and used only to represent
2879 * the main root device. We allow writing 0 to reset the device back
2880 * to normal mode after being used as a subordinate channel.
2882 if (channel > S16_MAX)
2885 dev->num_tc = -channel;
2889 EXPORT_SYMBOL(netdev_set_sb_channel);
2892 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2893 * greater than real_num_tx_queues stale skbs on the qdisc must be flushed.
2895 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2900 disabling = txq < dev->real_num_tx_queues;
2902 if (txq < 1 || txq > dev->num_tx_queues)
2905 if (dev->reg_state == NETREG_REGISTERED ||
2906 dev->reg_state == NETREG_UNREGISTERING) {
2909 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2915 netif_setup_tc(dev, txq);
2917 dev_qdisc_change_real_num_tx(dev, txq);
2919 dev->real_num_tx_queues = txq;
2923 qdisc_reset_all_tx_gt(dev, txq);
2925 netif_reset_xps_queues_gt(dev, txq);
2929 dev->real_num_tx_queues = txq;
2934 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2938 * netif_set_real_num_rx_queues - set actual number of RX queues used
2939 * @dev: Network device
2940 * @rxq: Actual number of RX queues
2942 * This must be called either with the rtnl_lock held or before
2943 * registration of the net device. Returns 0 on success, or a
2944 * negative error code. If called before registration, it always
2947 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2951 if (rxq < 1 || rxq > dev->num_rx_queues)
2954 if (dev->reg_state == NETREG_REGISTERED) {
2957 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2963 dev->real_num_rx_queues = rxq;
2966 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2970 * netif_set_real_num_queues - set actual number of RX and TX queues used
2971 * @dev: Network device
2972 * @txq: Actual number of TX queues
2973 * @rxq: Actual number of RX queues
2975 * Set the real number of both TX and RX queues.
2976 * Does nothing if the number of queues is already correct.
2978 int netif_set_real_num_queues(struct net_device *dev,
2979 unsigned int txq, unsigned int rxq)
2981 unsigned int old_rxq = dev->real_num_rx_queues;
2984 if (txq < 1 || txq > dev->num_tx_queues ||
2985 rxq < 1 || rxq > dev->num_rx_queues)
2988 /* Start from increases, so the error path only does decreases -
2989 * decreases can't fail.
2991 if (rxq > dev->real_num_rx_queues) {
2992 err = netif_set_real_num_rx_queues(dev, rxq);
2996 if (txq > dev->real_num_tx_queues) {
2997 err = netif_set_real_num_tx_queues(dev, txq);
3001 if (rxq < dev->real_num_rx_queues)
3002 WARN_ON(netif_set_real_num_rx_queues(dev, rxq));
3003 if (txq < dev->real_num_tx_queues)
3004 WARN_ON(netif_set_real_num_tx_queues(dev, txq));
3008 WARN_ON(netif_set_real_num_rx_queues(dev, old_rxq));
3011 EXPORT_SYMBOL(netif_set_real_num_queues);
3014 * netif_set_tso_max_size() - set the max size of TSO frames supported
3015 * @dev: netdev to update
3016 * @size: max skb->len of a TSO frame
3018 * Set the limit on the size of TSO super-frames the device can handle.
3019 * Unless explicitly set the stack will assume the value of
3020 * %GSO_LEGACY_MAX_SIZE.
3022 void netif_set_tso_max_size(struct net_device *dev, unsigned int size)
3024 dev->tso_max_size = min(GSO_MAX_SIZE, size);
3025 if (size < READ_ONCE(dev->gso_max_size))
3026 netif_set_gso_max_size(dev, size);
3027 if (size < READ_ONCE(dev->gso_ipv4_max_size))
3028 netif_set_gso_ipv4_max_size(dev, size);
3030 EXPORT_SYMBOL(netif_set_tso_max_size);
3033 * netif_set_tso_max_segs() - set the max number of segs supported for TSO
3034 * @dev: netdev to update
3035 * @segs: max number of TCP segments
3037 * Set the limit on the number of TCP segments the device can generate from
3038 * a single TSO super-frame.
3039 * Unless explicitly set the stack will assume the value of %GSO_MAX_SEGS.
3041 void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs)
3043 dev->tso_max_segs = segs;
3044 if (segs < READ_ONCE(dev->gso_max_segs))
3045 netif_set_gso_max_segs(dev, segs);
3047 EXPORT_SYMBOL(netif_set_tso_max_segs);
3050 * netif_inherit_tso_max() - copy all TSO limits from a lower device to an upper
3051 * @to: netdev to update
3052 * @from: netdev from which to copy the limits
3054 void netif_inherit_tso_max(struct net_device *to, const struct net_device *from)
3056 netif_set_tso_max_size(to, from->tso_max_size);
3057 netif_set_tso_max_segs(to, from->tso_max_segs);
3059 EXPORT_SYMBOL(netif_inherit_tso_max);
3062 * netif_get_num_default_rss_queues - default number of RSS queues
3064 * Default value is the number of physical cores if there are only 1 or 2, or
3065 * divided by 2 if there are more.
3067 int netif_get_num_default_rss_queues(void)
3072 if (unlikely(is_kdump_kernel() || !zalloc_cpumask_var(&cpus, GFP_KERNEL)))
3075 cpumask_copy(cpus, cpu_online_mask);
3076 for_each_cpu(cpu, cpus) {
3078 cpumask_andnot(cpus, cpus, topology_sibling_cpumask(cpu));
3080 free_cpumask_var(cpus);
3082 return count > 2 ? DIV_ROUND_UP(count, 2) : count;
3084 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
3086 static void __netif_reschedule(struct Qdisc *q)
3088 struct softnet_data *sd;
3089 unsigned long flags;
3091 local_irq_save(flags);
3092 sd = this_cpu_ptr(&softnet_data);
3093 q->next_sched = NULL;
3094 *sd->output_queue_tailp = q;
3095 sd->output_queue_tailp = &q->next_sched;
3096 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3097 local_irq_restore(flags);
3100 void __netif_schedule(struct Qdisc *q)
3102 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
3103 __netif_reschedule(q);
3105 EXPORT_SYMBOL(__netif_schedule);
3107 struct dev_kfree_skb_cb {
3108 enum skb_drop_reason reason;
3111 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
3113 return (struct dev_kfree_skb_cb *)skb->cb;
3116 void netif_schedule_queue(struct netdev_queue *txq)
3119 if (!netif_xmit_stopped(txq)) {
3120 struct Qdisc *q = rcu_dereference(txq->qdisc);
3122 __netif_schedule(q);
3126 EXPORT_SYMBOL(netif_schedule_queue);
3128 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
3130 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
3134 q = rcu_dereference(dev_queue->qdisc);
3135 __netif_schedule(q);
3139 EXPORT_SYMBOL(netif_tx_wake_queue);
3141 void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason)
3143 unsigned long flags;
3148 if (likely(refcount_read(&skb->users) == 1)) {
3150 refcount_set(&skb->users, 0);
3151 } else if (likely(!refcount_dec_and_test(&skb->users))) {
3154 get_kfree_skb_cb(skb)->reason = reason;
3155 local_irq_save(flags);
3156 skb->next = __this_cpu_read(softnet_data.completion_queue);
3157 __this_cpu_write(softnet_data.completion_queue, skb);
3158 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3159 local_irq_restore(flags);
3161 EXPORT_SYMBOL(dev_kfree_skb_irq_reason);
3163 void dev_kfree_skb_any_reason(struct sk_buff *skb, enum skb_drop_reason reason)
3165 if (in_hardirq() || irqs_disabled())
3166 dev_kfree_skb_irq_reason(skb, reason);
3168 kfree_skb_reason(skb, reason);
3170 EXPORT_SYMBOL(dev_kfree_skb_any_reason);
3174 * netif_device_detach - mark device as removed
3175 * @dev: network device
3177 * Mark device as removed from system and therefore no longer available.
3179 void netif_device_detach(struct net_device *dev)
3181 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
3182 netif_running(dev)) {
3183 netif_tx_stop_all_queues(dev);
3186 EXPORT_SYMBOL(netif_device_detach);
3189 * netif_device_attach - mark device as attached
3190 * @dev: network device
3192 * Mark device as attached from system and restart if needed.
3194 void netif_device_attach(struct net_device *dev)
3196 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
3197 netif_running(dev)) {
3198 netif_tx_wake_all_queues(dev);
3199 __netdev_watchdog_up(dev);
3202 EXPORT_SYMBOL(netif_device_attach);
3205 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
3206 * to be used as a distribution range.
3208 static u16 skb_tx_hash(const struct net_device *dev,
3209 const struct net_device *sb_dev,
3210 struct sk_buff *skb)
3214 u16 qcount = dev->real_num_tx_queues;
3217 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
3219 qoffset = sb_dev->tc_to_txq[tc].offset;
3220 qcount = sb_dev->tc_to_txq[tc].count;
3221 if (unlikely(!qcount)) {
3222 net_warn_ratelimited("%s: invalid qcount, qoffset %u for tc %u\n",
3223 sb_dev->name, qoffset, tc);
3225 qcount = dev->real_num_tx_queues;
3229 if (skb_rx_queue_recorded(skb)) {
3230 DEBUG_NET_WARN_ON_ONCE(qcount == 0);
3231 hash = skb_get_rx_queue(skb);
3232 if (hash >= qoffset)
3234 while (unlikely(hash >= qcount))
3236 return hash + qoffset;
3239 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
3242 void skb_warn_bad_offload(const struct sk_buff *skb)
3244 static const netdev_features_t null_features;
3245 struct net_device *dev = skb->dev;
3246 const char *name = "";
3248 if (!net_ratelimit())
3252 if (dev->dev.parent)
3253 name = dev_driver_string(dev->dev.parent);
3255 name = netdev_name(dev);
3257 skb_dump(KERN_WARNING, skb, false);
3258 WARN(1, "%s: caps=(%pNF, %pNF)\n",
3259 name, dev ? &dev->features : &null_features,
3260 skb->sk ? &skb->sk->sk_route_caps : &null_features);
3264 * Invalidate hardware checksum when packet is to be mangled, and
3265 * complete checksum manually on outgoing path.
3267 int skb_checksum_help(struct sk_buff *skb)
3270 int ret = 0, offset;
3272 if (skb->ip_summed == CHECKSUM_COMPLETE)
3273 goto out_set_summed;
3275 if (unlikely(skb_is_gso(skb))) {
3276 skb_warn_bad_offload(skb);
3280 /* Before computing a checksum, we should make sure no frag could
3281 * be modified by an external entity : checksum could be wrong.
3283 if (skb_has_shared_frag(skb)) {
3284 ret = __skb_linearize(skb);
3289 offset = skb_checksum_start_offset(skb);
3291 if (unlikely(offset >= skb_headlen(skb))) {
3292 DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
3293 WARN_ONCE(true, "offset (%d) >= skb_headlen() (%u)\n",
3294 offset, skb_headlen(skb));
3297 csum = skb_checksum(skb, offset, skb->len - offset, 0);
3299 offset += skb->csum_offset;
3300 if (unlikely(offset + sizeof(__sum16) > skb_headlen(skb))) {
3301 DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
3302 WARN_ONCE(true, "offset+2 (%zu) > skb_headlen() (%u)\n",
3303 offset + sizeof(__sum16), skb_headlen(skb));
3306 ret = skb_ensure_writable(skb, offset + sizeof(__sum16));
3310 *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;
3312 skb->ip_summed = CHECKSUM_NONE;
3316 EXPORT_SYMBOL(skb_checksum_help);
3318 int skb_crc32c_csum_help(struct sk_buff *skb)
3321 int ret = 0, offset, start;
3323 if (skb->ip_summed != CHECKSUM_PARTIAL)
3326 if (unlikely(skb_is_gso(skb)))
3329 /* Before computing a checksum, we should make sure no frag could
3330 * be modified by an external entity : checksum could be wrong.
3332 if (unlikely(skb_has_shared_frag(skb))) {
3333 ret = __skb_linearize(skb);
3337 start = skb_checksum_start_offset(skb);
3338 offset = start + offsetof(struct sctphdr, checksum);
3339 if (WARN_ON_ONCE(offset >= skb_headlen(skb))) {
3344 ret = skb_ensure_writable(skb, offset + sizeof(__le32));
3348 crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start,
3349 skb->len - start, ~(__u32)0,
3351 *(__le32 *)(skb->data + offset) = crc32c_csum;
3352 skb_reset_csum_not_inet(skb);
3357 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
3359 __be16 type = skb->protocol;
3361 /* Tunnel gso handlers can set protocol to ethernet. */
3362 if (type == htons(ETH_P_TEB)) {
3365 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
3368 eth = (struct ethhdr *)skb->data;
3369 type = eth->h_proto;
3372 return vlan_get_protocol_and_depth(skb, type, depth);
3376 /* Take action when hardware reception checksum errors are detected. */
3378 static void do_netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
3380 netdev_err(dev, "hw csum failure\n");
3381 skb_dump(KERN_ERR, skb, true);
3385 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
3387 DO_ONCE_LITE(do_netdev_rx_csum_fault, dev, skb);
3389 EXPORT_SYMBOL(netdev_rx_csum_fault);
3392 /* XXX: check that highmem exists at all on the given machine. */
3393 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
3395 #ifdef CONFIG_HIGHMEM
3398 if (!(dev->features & NETIF_F_HIGHDMA)) {
3399 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
3400 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
3402 if (PageHighMem(skb_frag_page(frag)))
3410 /* If MPLS offload request, verify we are testing hardware MPLS features
3411 * instead of standard features for the netdev.
3413 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
3414 static netdev_features_t net_mpls_features(struct sk_buff *skb,
3415 netdev_features_t features,
3418 if (eth_p_mpls(type))
3419 features &= skb->dev->mpls_features;
3424 static netdev_features_t net_mpls_features(struct sk_buff *skb,
3425 netdev_features_t features,
3432 static netdev_features_t harmonize_features(struct sk_buff *skb,
3433 netdev_features_t features)
3437 type = skb_network_protocol(skb, NULL);
3438 features = net_mpls_features(skb, features, type);
3440 if (skb->ip_summed != CHECKSUM_NONE &&
3441 !can_checksum_protocol(features, type)) {
3442 features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
3444 if (illegal_highdma(skb->dev, skb))
3445 features &= ~NETIF_F_SG;
3450 netdev_features_t passthru_features_check(struct sk_buff *skb,
3451 struct net_device *dev,
3452 netdev_features_t features)
3456 EXPORT_SYMBOL(passthru_features_check);
3458 static netdev_features_t dflt_features_check(struct sk_buff *skb,
3459 struct net_device *dev,
3460 netdev_features_t features)
3462 return vlan_features_check(skb, features);
3465 static netdev_features_t gso_features_check(const struct sk_buff *skb,
3466 struct net_device *dev,
3467 netdev_features_t features)
3469 u16 gso_segs = skb_shinfo(skb)->gso_segs;
3471 if (gso_segs > READ_ONCE(dev->gso_max_segs))
3472 return features & ~NETIF_F_GSO_MASK;
3474 if (unlikely(skb->len >= READ_ONCE(dev->gso_max_size)))
3475 return features & ~NETIF_F_GSO_MASK;
3477 if (!skb_shinfo(skb)->gso_type) {
3478 skb_warn_bad_offload(skb);
3479 return features & ~NETIF_F_GSO_MASK;
3482 /* Support for GSO partial features requires software
3483 * intervention before we can actually process the packets
3484 * so we need to strip support for any partial features now
3485 * and we can pull them back in after we have partially
3486 * segmented the frame.
3488 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
3489 features &= ~dev->gso_partial_features;
3491 /* Make sure to clear the IPv4 ID mangling feature if the
3492 * IPv4 header has the potential to be fragmented.
3494 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
3495 struct iphdr *iph = skb->encapsulation ?
3496 inner_ip_hdr(skb) : ip_hdr(skb);
3498 if (!(iph->frag_off & htons(IP_DF)))
3499 features &= ~NETIF_F_TSO_MANGLEID;
3505 netdev_features_t netif_skb_features(struct sk_buff *skb)
3507 struct net_device *dev = skb->dev;
3508 netdev_features_t features = dev->features;
3510 if (skb_is_gso(skb))
3511 features = gso_features_check(skb, dev, features);
3513 /* If encapsulation offload request, verify we are testing
3514 * hardware encapsulation features instead of standard
3515 * features for the netdev
3517 if (skb->encapsulation)
3518 features &= dev->hw_enc_features;
3520 if (skb_vlan_tagged(skb))
3521 features = netdev_intersect_features(features,
3522 dev->vlan_features |
3523 NETIF_F_HW_VLAN_CTAG_TX |
3524 NETIF_F_HW_VLAN_STAG_TX);
3526 if (dev->netdev_ops->ndo_features_check)
3527 features &= dev->netdev_ops->ndo_features_check(skb, dev,
3530 features &= dflt_features_check(skb, dev, features);
3532 return harmonize_features(skb, features);
3534 EXPORT_SYMBOL(netif_skb_features);
3536 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
3537 struct netdev_queue *txq, bool more)
3542 if (dev_nit_active(dev))
3543 dev_queue_xmit_nit(skb, dev);
3546 trace_net_dev_start_xmit(skb, dev);
3547 rc = netdev_start_xmit(skb, dev, txq, more);
3548 trace_net_dev_xmit(skb, rc, dev, len);
3553 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
3554 struct netdev_queue *txq, int *ret)
3556 struct sk_buff *skb = first;
3557 int rc = NETDEV_TX_OK;
3560 struct sk_buff *next = skb->next;
3562 skb_mark_not_on_list(skb);
3563 rc = xmit_one(skb, dev, txq, next != NULL);
3564 if (unlikely(!dev_xmit_complete(rc))) {
3570 if (netif_tx_queue_stopped(txq) && skb) {
3571 rc = NETDEV_TX_BUSY;
3581 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
3582 netdev_features_t features)
3584 if (skb_vlan_tag_present(skb) &&
3585 !vlan_hw_offload_capable(features, skb->vlan_proto))
3586 skb = __vlan_hwaccel_push_inside(skb);
3590 int skb_csum_hwoffload_help(struct sk_buff *skb,
3591 const netdev_features_t features)
3593 if (unlikely(skb_csum_is_sctp(skb)))
3594 return !!(features & NETIF_F_SCTP_CRC) ? 0 :
3595 skb_crc32c_csum_help(skb);
3597 if (features & NETIF_F_HW_CSUM)
3600 if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) {
3601 switch (skb->csum_offset) {
3602 case offsetof(struct tcphdr, check):
3603 case offsetof(struct udphdr, check):
3608 return skb_checksum_help(skb);
3610 EXPORT_SYMBOL(skb_csum_hwoffload_help);
3612 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again)
3614 netdev_features_t features;
3616 features = netif_skb_features(skb);
3617 skb = validate_xmit_vlan(skb, features);
3621 skb = sk_validate_xmit_skb(skb, dev);
3625 if (netif_needs_gso(skb, features)) {
3626 struct sk_buff *segs;
3628 segs = skb_gso_segment(skb, features);
3636 if (skb_needs_linearize(skb, features) &&
3637 __skb_linearize(skb))
3640 /* If packet is not checksummed and device does not
3641 * support checksumming for this protocol, complete
3642 * checksumming here.
3644 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3645 if (skb->encapsulation)
3646 skb_set_inner_transport_header(skb,
3647 skb_checksum_start_offset(skb));
3649 skb_set_transport_header(skb,
3650 skb_checksum_start_offset(skb));
3651 if (skb_csum_hwoffload_help(skb, features))
3656 skb = validate_xmit_xfrm(skb, features, again);
3663 dev_core_stats_tx_dropped_inc(dev);
3667 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again)
3669 struct sk_buff *next, *head = NULL, *tail;
3671 for (; skb != NULL; skb = next) {
3673 skb_mark_not_on_list(skb);
3675 /* in case skb wont be segmented, point to itself */
3678 skb = validate_xmit_skb(skb, dev, again);
3686 /* If skb was segmented, skb->prev points to
3687 * the last segment. If not, it still contains skb.
3693 EXPORT_SYMBOL_GPL(validate_xmit_skb_list);
3695 static void qdisc_pkt_len_init(struct sk_buff *skb)
3697 const struct skb_shared_info *shinfo = skb_shinfo(skb);
3699 qdisc_skb_cb(skb)->pkt_len = skb->len;
3701 /* To get more precise estimation of bytes sent on wire,
3702 * we add to pkt_len the headers size of all segments
3704 if (shinfo->gso_size && skb_transport_header_was_set(skb)) {
3705 u16 gso_segs = shinfo->gso_segs;
3706 unsigned int hdr_len;
3708 /* mac layer + network layer */
3709 hdr_len = skb_transport_offset(skb);
3711 /* + transport layer */
3712 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) {
3713 const struct tcphdr *th;
3714 struct tcphdr _tcphdr;
3716 th = skb_header_pointer(skb, hdr_len,
3717 sizeof(_tcphdr), &_tcphdr);
3719 hdr_len += __tcp_hdrlen(th);
3721 struct udphdr _udphdr;
3723 if (skb_header_pointer(skb, hdr_len,
3724 sizeof(_udphdr), &_udphdr))
3725 hdr_len += sizeof(struct udphdr);
3728 if (shinfo->gso_type & SKB_GSO_DODGY)
3729 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
3732 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
3736 static int dev_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *q,
3737 struct sk_buff **to_free,
3738 struct netdev_queue *txq)
3742 rc = q->enqueue(skb, q, to_free) & NET_XMIT_MASK;
3743 if (rc == NET_XMIT_SUCCESS)
3744 trace_qdisc_enqueue(q, txq, skb);
3748 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
3749 struct net_device *dev,
3750 struct netdev_queue *txq)
3752 spinlock_t *root_lock = qdisc_lock(q);
3753 struct sk_buff *to_free = NULL;
3757 qdisc_calculate_pkt_len(skb, q);
3759 tcf_set_drop_reason(skb, SKB_DROP_REASON_QDISC_DROP);
3761 if (q->flags & TCQ_F_NOLOCK) {
3762 if (q->flags & TCQ_F_CAN_BYPASS && nolock_qdisc_is_empty(q) &&
3763 qdisc_run_begin(q)) {
3764 /* Retest nolock_qdisc_is_empty() within the protection
3765 * of q->seqlock to protect from racing with requeuing.
3767 if (unlikely(!nolock_qdisc_is_empty(q))) {
3768 rc = dev_qdisc_enqueue(skb, q, &to_free, txq);
3775 qdisc_bstats_cpu_update(q, skb);
3776 if (sch_direct_xmit(skb, q, dev, txq, NULL, true) &&
3777 !nolock_qdisc_is_empty(q))
3781 return NET_XMIT_SUCCESS;
3784 rc = dev_qdisc_enqueue(skb, q, &to_free, txq);
3788 if (unlikely(to_free))
3789 kfree_skb_list_reason(to_free,
3790 tcf_get_drop_reason(to_free));
3795 * Heuristic to force contended enqueues to serialize on a
3796 * separate lock before trying to get qdisc main lock.
3797 * This permits qdisc->running owner to get the lock more
3798 * often and dequeue packets faster.
3799 * On PREEMPT_RT it is possible to preempt the qdisc owner during xmit
3800 * and then other tasks will only enqueue packets. The packets will be
3801 * sent after the qdisc owner is scheduled again. To prevent this
3802 * scenario the task always serialize on the lock.
3804 contended = qdisc_is_running(q) || IS_ENABLED(CONFIG_PREEMPT_RT);
3805 if (unlikely(contended))
3806 spin_lock(&q->busylock);
3808 spin_lock(root_lock);
3809 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
3810 __qdisc_drop(skb, &to_free);
3812 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
3813 qdisc_run_begin(q)) {
3815 * This is a work-conserving queue; there are no old skbs
3816 * waiting to be sent out; and the qdisc is not running -
3817 * xmit the skb directly.
3820 qdisc_bstats_update(q, skb);
3822 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
3823 if (unlikely(contended)) {
3824 spin_unlock(&q->busylock);
3831 rc = NET_XMIT_SUCCESS;
3833 rc = dev_qdisc_enqueue(skb, q, &to_free, txq);
3834 if (qdisc_run_begin(q)) {
3835 if (unlikely(contended)) {
3836 spin_unlock(&q->busylock);
3843 spin_unlock(root_lock);
3844 if (unlikely(to_free))
3845 kfree_skb_list_reason(to_free,
3846 tcf_get_drop_reason(to_free));
3847 if (unlikely(contended))
3848 spin_unlock(&q->busylock);
3852 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3853 static void skb_update_prio(struct sk_buff *skb)
3855 const struct netprio_map *map;
3856 const struct sock *sk;
3857 unsigned int prioidx;
3861 map = rcu_dereference_bh(skb->dev->priomap);
3864 sk = skb_to_full_sk(skb);
3868 prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data);
3870 if (prioidx < map->priomap_len)
3871 skb->priority = map->priomap[prioidx];
3874 #define skb_update_prio(skb)
3878 * dev_loopback_xmit - loop back @skb
3879 * @net: network namespace this loopback is happening in
3880 * @sk: sk needed to be a netfilter okfn
3881 * @skb: buffer to transmit
3883 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
3885 skb_reset_mac_header(skb);
3886 __skb_pull(skb, skb_network_offset(skb));
3887 skb->pkt_type = PACKET_LOOPBACK;
3888 if (skb->ip_summed == CHECKSUM_NONE)
3889 skb->ip_summed = CHECKSUM_UNNECESSARY;
3890 DEBUG_NET_WARN_ON_ONCE(!skb_dst(skb));
3895 EXPORT_SYMBOL(dev_loopback_xmit);
3897 #ifdef CONFIG_NET_EGRESS
3898 static struct netdev_queue *
3899 netdev_tx_queue_mapping(struct net_device *dev, struct sk_buff *skb)
3901 int qm = skb_get_queue_mapping(skb);
3903 return netdev_get_tx_queue(dev, netdev_cap_txqueue(dev, qm));
3906 static bool netdev_xmit_txqueue_skipped(void)
3908 return __this_cpu_read(softnet_data.xmit.skip_txqueue);
3911 void netdev_xmit_skip_txqueue(bool skip)
3913 __this_cpu_write(softnet_data.xmit.skip_txqueue, skip);
3915 EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);
3916 #endif /* CONFIG_NET_EGRESS */
3918 #ifdef CONFIG_NET_XGRESS
3919 static int tc_run(struct tcx_entry *entry, struct sk_buff *skb,
3920 enum skb_drop_reason *drop_reason)
3922 int ret = TC_ACT_UNSPEC;
3923 #ifdef CONFIG_NET_CLS_ACT
3924 struct mini_Qdisc *miniq = rcu_dereference_bh(entry->miniq);
3925 struct tcf_result res;
3930 tc_skb_cb(skb)->mru = 0;
3931 tc_skb_cb(skb)->post_ct = false;
3932 tcf_set_drop_reason(skb, *drop_reason);
3934 mini_qdisc_bstats_cpu_update(miniq, skb);
3935 ret = tcf_classify(skb, miniq->block, miniq->filter_list, &res, false);
3936 /* Only tcf related quirks below. */
3939 *drop_reason = tcf_get_drop_reason(skb);
3940 mini_qdisc_qstats_cpu_drop(miniq);
3943 case TC_ACT_RECLASSIFY:
3944 skb->tc_index = TC_H_MIN(res.classid);
3947 #endif /* CONFIG_NET_CLS_ACT */
3951 static DEFINE_STATIC_KEY_FALSE(tcx_needed_key);
3955 static_branch_inc(&tcx_needed_key);
3960 static_branch_dec(&tcx_needed_key);
3963 static __always_inline enum tcx_action_base
3964 tcx_run(const struct bpf_mprog_entry *entry, struct sk_buff *skb,
3965 const bool needs_mac)
3967 const struct bpf_mprog_fp *fp;
3968 const struct bpf_prog *prog;
3972 __skb_push(skb, skb->mac_len);
3973 bpf_mprog_foreach_prog(entry, fp, prog) {
3974 bpf_compute_data_pointers(skb);
3975 ret = bpf_prog_run(prog, skb);
3976 if (ret != TCX_NEXT)
3980 __skb_pull(skb, skb->mac_len);
3981 return tcx_action_code(skb, ret);
3984 static __always_inline struct sk_buff *
3985 sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
3986 struct net_device *orig_dev, bool *another)
3988 struct bpf_mprog_entry *entry = rcu_dereference_bh(skb->dev->tcx_ingress);
3989 enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_INGRESS;
3995 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3999 qdisc_skb_cb(skb)->pkt_len = skb->len;
4000 tcx_set_ingress(skb, true);
4002 if (static_branch_unlikely(&tcx_needed_key)) {
4003 sch_ret = tcx_run(entry, skb, true);
4004 if (sch_ret != TC_ACT_UNSPEC)
4005 goto ingress_verdict;
4007 sch_ret = tc_run(tcx_entry(entry), skb, &drop_reason);
4010 case TC_ACT_REDIRECT:
4011 /* skb_mac_header check was done by BPF, so we can safely
4012 * push the L2 header back before redirecting to another
4015 __skb_push(skb, skb->mac_len);
4016 if (skb_do_redirect(skb) == -EAGAIN) {
4017 __skb_pull(skb, skb->mac_len);
4021 *ret = NET_RX_SUCCESS;
4024 kfree_skb_reason(skb, drop_reason);
4027 /* used by tc_run */
4033 case TC_ACT_CONSUMED:
4034 *ret = NET_RX_SUCCESS;
4041 static __always_inline struct sk_buff *
4042 sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
4044 struct bpf_mprog_entry *entry = rcu_dereference_bh(dev->tcx_egress);
4045 enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_EGRESS;
4051 /* qdisc_skb_cb(skb)->pkt_len & tcx_set_ingress() was
4052 * already set by the caller.
4054 if (static_branch_unlikely(&tcx_needed_key)) {
4055 sch_ret = tcx_run(entry, skb, false);
4056 if (sch_ret != TC_ACT_UNSPEC)
4057 goto egress_verdict;
4059 sch_ret = tc_run(tcx_entry(entry), skb, &drop_reason);
4062 case TC_ACT_REDIRECT:
4063 /* No need to push/pop skb's mac_header here on egress! */
4064 skb_do_redirect(skb);
4065 *ret = NET_XMIT_SUCCESS;
4068 kfree_skb_reason(skb, drop_reason);
4069 *ret = NET_XMIT_DROP;
4071 /* used by tc_run */
4077 case TC_ACT_CONSUMED:
4078 *ret = NET_XMIT_SUCCESS;
4085 static __always_inline struct sk_buff *
4086 sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
4087 struct net_device *orig_dev, bool *another)
4092 static __always_inline struct sk_buff *
4093 sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
4097 #endif /* CONFIG_NET_XGRESS */
4100 static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb,
4101 struct xps_dev_maps *dev_maps, unsigned int tci)
4103 int tc = netdev_get_prio_tc_map(dev, skb->priority);
4104 struct xps_map *map;
4105 int queue_index = -1;
4107 if (tc >= dev_maps->num_tc || tci >= dev_maps->nr_ids)
4110 tci *= dev_maps->num_tc;
4113 map = rcu_dereference(dev_maps->attr_map[tci]);
4116 queue_index = map->queues[0];
4118 queue_index = map->queues[reciprocal_scale(
4119 skb_get_hash(skb), map->len)];
4120 if (unlikely(queue_index >= dev->real_num_tx_queues))
4127 static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev,
4128 struct sk_buff *skb)
4131 struct xps_dev_maps *dev_maps;
4132 struct sock *sk = skb->sk;
4133 int queue_index = -1;
4135 if (!static_key_false(&xps_needed))
4139 if (!static_key_false(&xps_rxqs_needed))
4142 dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_RXQS]);
4144 int tci = sk_rx_queue_get(sk);
4147 queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
4152 if (queue_index < 0) {
4153 dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_CPUS]);
4155 unsigned int tci = skb->sender_cpu - 1;
4157 queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
4169 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb,
4170 struct net_device *sb_dev)
4174 EXPORT_SYMBOL(dev_pick_tx_zero);
4176 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb,
4177 struct net_device *sb_dev)
4179 return (u16)raw_smp_processor_id() % dev->real_num_tx_queues;
4181 EXPORT_SYMBOL(dev_pick_tx_cpu_id);
4183 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
4184 struct net_device *sb_dev)
4186 struct sock *sk = skb->sk;
4187 int queue_index = sk_tx_queue_get(sk);
4189 sb_dev = sb_dev ? : dev;
4191 if (queue_index < 0 || skb->ooo_okay ||
4192 queue_index >= dev->real_num_tx_queues) {
4193 int new_index = get_xps_queue(dev, sb_dev, skb);
4196 new_index = skb_tx_hash(dev, sb_dev, skb);
4198 if (queue_index != new_index && sk &&
4200 rcu_access_pointer(sk->sk_dst_cache))
4201 sk_tx_queue_set(sk, new_index);
4203 queue_index = new_index;
4208 EXPORT_SYMBOL(netdev_pick_tx);
4210 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev,
4211 struct sk_buff *skb,
4212 struct net_device *sb_dev)
4214 int queue_index = 0;
4217 u32 sender_cpu = skb->sender_cpu - 1;
4219 if (sender_cpu >= (u32)NR_CPUS)
4220 skb->sender_cpu = raw_smp_processor_id() + 1;
4223 if (dev->real_num_tx_queues != 1) {
4224 const struct net_device_ops *ops = dev->netdev_ops;
4226 if (ops->ndo_select_queue)
4227 queue_index = ops->ndo_select_queue(dev, skb, sb_dev);
4229 queue_index = netdev_pick_tx(dev, skb, sb_dev);
4231 queue_index = netdev_cap_txqueue(dev, queue_index);
4234 skb_set_queue_mapping(skb, queue_index);
4235 return netdev_get_tx_queue(dev, queue_index);
4239 * __dev_queue_xmit() - transmit a buffer
4240 * @skb: buffer to transmit
4241 * @sb_dev: suboordinate device used for L2 forwarding offload
4243 * Queue a buffer for transmission to a network device. The caller must
4244 * have set the device and priority and built the buffer before calling
4245 * this function. The function can be called from an interrupt.
4247 * When calling this method, interrupts MUST be enabled. This is because
4248 * the BH enable code must have IRQs enabled so that it will not deadlock.
4250 * Regardless of the return value, the skb is consumed, so it is currently
4251 * difficult to retry a send to this method. (You can bump the ref count
4252 * before sending to hold a reference for retry if you are careful.)
4255 * * 0 - buffer successfully transmitted
4256 * * positive qdisc return code - NET_XMIT_DROP etc.
4257 * * negative errno - other errors
4259 int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev)
4261 struct net_device *dev = skb->dev;
4262 struct netdev_queue *txq = NULL;
4267 skb_reset_mac_header(skb);
4268 skb_assert_len(skb);
4270 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
4271 __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED);
4273 /* Disable soft irqs for various locks below. Also
4274 * stops preemption for RCU.
4278 skb_update_prio(skb);
4280 qdisc_pkt_len_init(skb);
4281 tcx_set_ingress(skb, false);
4282 #ifdef CONFIG_NET_EGRESS
4283 if (static_branch_unlikely(&egress_needed_key)) {
4284 if (nf_hook_egress_active()) {
4285 skb = nf_hook_egress(skb, &rc, dev);
4290 netdev_xmit_skip_txqueue(false);
4292 nf_skip_egress(skb, true);
4293 skb = sch_handle_egress(skb, &rc, dev);
4296 nf_skip_egress(skb, false);
4298 if (netdev_xmit_txqueue_skipped())
4299 txq = netdev_tx_queue_mapping(dev, skb);
4302 /* If device/qdisc don't need skb->dst, release it right now while
4303 * its hot in this cpu cache.
4305 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
4311 txq = netdev_core_pick_tx(dev, skb, sb_dev);
4313 q = rcu_dereference_bh(txq->qdisc);
4315 trace_net_dev_queue(skb);
4317 rc = __dev_xmit_skb(skb, q, dev, txq);
4321 /* The device has no queue. Common case for software devices:
4322 * loopback, all the sorts of tunnels...
4324 * Really, it is unlikely that netif_tx_lock protection is necessary
4325 * here. (f.e. loopback and IP tunnels are clean ignoring statistics
4327 * However, it is possible, that they rely on protection
4330 * Check this and shot the lock. It is not prone from deadlocks.
4331 *Either shot noqueue qdisc, it is even simpler 8)
4333 if (dev->flags & IFF_UP) {
4334 int cpu = smp_processor_id(); /* ok because BHs are off */
4336 /* Other cpus might concurrently change txq->xmit_lock_owner
4337 * to -1 or to their cpu id, but not to our id.
4339 if (READ_ONCE(txq->xmit_lock_owner) != cpu) {
4340 if (dev_xmit_recursion())
4341 goto recursion_alert;
4343 skb = validate_xmit_skb(skb, dev, &again);
4347 HARD_TX_LOCK(dev, txq, cpu);
4349 if (!netif_xmit_stopped(txq)) {
4350 dev_xmit_recursion_inc();
4351 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
4352 dev_xmit_recursion_dec();
4353 if (dev_xmit_complete(rc)) {
4354 HARD_TX_UNLOCK(dev, txq);
4358 HARD_TX_UNLOCK(dev, txq);
4359 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
4362 /* Recursion is detected! It is possible,
4366 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
4372 rcu_read_unlock_bh();
4374 dev_core_stats_tx_dropped_inc(dev);
4375 kfree_skb_list(skb);
4378 rcu_read_unlock_bh();
4381 EXPORT_SYMBOL(__dev_queue_xmit);
4383 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id)
4385 struct net_device *dev = skb->dev;
4386 struct sk_buff *orig_skb = skb;
4387 struct netdev_queue *txq;
4388 int ret = NETDEV_TX_BUSY;
4391 if (unlikely(!netif_running(dev) ||
4392 !netif_carrier_ok(dev)))
4395 skb = validate_xmit_skb_list(skb, dev, &again);
4396 if (skb != orig_skb)
4399 skb_set_queue_mapping(skb, queue_id);
4400 txq = skb_get_tx_queue(dev, skb);
4404 dev_xmit_recursion_inc();
4405 HARD_TX_LOCK(dev, txq, smp_processor_id());
4406 if (!netif_xmit_frozen_or_drv_stopped(txq))
4407 ret = netdev_start_xmit(skb, dev, txq, false);
4408 HARD_TX_UNLOCK(dev, txq);
4409 dev_xmit_recursion_dec();
4414 dev_core_stats_tx_dropped_inc(dev);
4415 kfree_skb_list(skb);
4416 return NET_XMIT_DROP;
4418 EXPORT_SYMBOL(__dev_direct_xmit);
4420 /*************************************************************************
4422 *************************************************************************/
4424 int netdev_max_backlog __read_mostly = 1000;
4425 EXPORT_SYMBOL(netdev_max_backlog);
4427 int netdev_tstamp_prequeue __read_mostly = 1;
4428 unsigned int sysctl_skb_defer_max __read_mostly = 64;
4429 int netdev_budget __read_mostly = 300;
4430 /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */
4431 unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ;
4432 int weight_p __read_mostly = 64; /* old backlog weight */
4433 int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */
4434 int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */
4435 int dev_rx_weight __read_mostly = 64;
4436 int dev_tx_weight __read_mostly = 64;
4438 /* Called with irq disabled */
4439 static inline void ____napi_schedule(struct softnet_data *sd,
4440 struct napi_struct *napi)
4442 struct task_struct *thread;
4444 lockdep_assert_irqs_disabled();
4446 if (test_bit(NAPI_STATE_THREADED, &napi->state)) {
4447 /* Paired with smp_mb__before_atomic() in
4448 * napi_enable()/dev_set_threaded().
4449 * Use READ_ONCE() to guarantee a complete
4450 * read on napi->thread. Only call
4451 * wake_up_process() when it's not NULL.
4453 thread = READ_ONCE(napi->thread);
4455 /* Avoid doing set_bit() if the thread is in
4456 * INTERRUPTIBLE state, cause napi_thread_wait()
4457 * makes sure to proceed with napi polling
4458 * if the thread is explicitly woken from here.
4460 if (READ_ONCE(thread->__state) != TASK_INTERRUPTIBLE)
4461 set_bit(NAPI_STATE_SCHED_THREADED, &napi->state);
4462 wake_up_process(thread);
4467 list_add_tail(&napi->poll_list, &sd->poll_list);
4468 WRITE_ONCE(napi->list_owner, smp_processor_id());
4469 /* If not called from net_rx_action()
4470 * we have to raise NET_RX_SOFTIRQ.
4472 if (!sd->in_net_rx_action)
4473 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4478 /* One global table that all flow-based protocols share. */
4479 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
4480 EXPORT_SYMBOL(rps_sock_flow_table);
4481 u32 rps_cpu_mask __read_mostly;
4482 EXPORT_SYMBOL(rps_cpu_mask);
4484 struct static_key_false rps_needed __read_mostly;
4485 EXPORT_SYMBOL(rps_needed);
4486 struct static_key_false rfs_needed __read_mostly;
4487 EXPORT_SYMBOL(rfs_needed);
4489 static struct rps_dev_flow *
4490 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
4491 struct rps_dev_flow *rflow, u16 next_cpu)
4493 if (next_cpu < nr_cpu_ids) {
4494 #ifdef CONFIG_RFS_ACCEL
4495 struct netdev_rx_queue *rxqueue;
4496 struct rps_dev_flow_table *flow_table;
4497 struct rps_dev_flow *old_rflow;
4502 /* Should we steer this flow to a different hardware queue? */
4503 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
4504 !(dev->features & NETIF_F_NTUPLE))
4506 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
4507 if (rxq_index == skb_get_rx_queue(skb))
4510 rxqueue = dev->_rx + rxq_index;
4511 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4514 flow_id = skb_get_hash(skb) & flow_table->mask;
4515 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
4516 rxq_index, flow_id);
4520 rflow = &flow_table->flows[flow_id];
4522 if (old_rflow->filter == rflow->filter)
4523 old_rflow->filter = RPS_NO_FILTER;
4527 per_cpu(softnet_data, next_cpu).input_queue_head;
4530 rflow->cpu = next_cpu;
4535 * get_rps_cpu is called from netif_receive_skb and returns the target
4536 * CPU from the RPS map of the receiving queue for a given skb.
4537 * rcu_read_lock must be held on entry.
4539 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
4540 struct rps_dev_flow **rflowp)
4542 const struct rps_sock_flow_table *sock_flow_table;
4543 struct netdev_rx_queue *rxqueue = dev->_rx;
4544 struct rps_dev_flow_table *flow_table;
4545 struct rps_map *map;
4550 if (skb_rx_queue_recorded(skb)) {
4551 u16 index = skb_get_rx_queue(skb);
4553 if (unlikely(index >= dev->real_num_rx_queues)) {
4554 WARN_ONCE(dev->real_num_rx_queues > 1,
4555 "%s received packet on queue %u, but number "
4556 "of RX queues is %u\n",
4557 dev->name, index, dev->real_num_rx_queues);
4563 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
4565 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4566 map = rcu_dereference(rxqueue->rps_map);
4567 if (!flow_table && !map)
4570 skb_reset_network_header(skb);
4571 hash = skb_get_hash(skb);
4575 sock_flow_table = rcu_dereference(rps_sock_flow_table);
4576 if (flow_table && sock_flow_table) {
4577 struct rps_dev_flow *rflow;
4581 /* First check into global flow table if there is a match.
4582 * This READ_ONCE() pairs with WRITE_ONCE() from rps_record_sock_flow().
4584 ident = READ_ONCE(sock_flow_table->ents[hash & sock_flow_table->mask]);
4585 if ((ident ^ hash) & ~rps_cpu_mask)
4588 next_cpu = ident & rps_cpu_mask;
4590 /* OK, now we know there is a match,
4591 * we can look at the local (per receive queue) flow table
4593 rflow = &flow_table->flows[hash & flow_table->mask];
4597 * If the desired CPU (where last recvmsg was done) is
4598 * different from current CPU (one in the rx-queue flow
4599 * table entry), switch if one of the following holds:
4600 * - Current CPU is unset (>= nr_cpu_ids).
4601 * - Current CPU is offline.
4602 * - The current CPU's queue tail has advanced beyond the
4603 * last packet that was enqueued using this table entry.
4604 * This guarantees that all previous packets for the flow
4605 * have been dequeued, thus preserving in order delivery.
4607 if (unlikely(tcpu != next_cpu) &&
4608 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
4609 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
4610 rflow->last_qtail)) >= 0)) {
4612 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
4615 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
4625 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
4626 if (cpu_online(tcpu)) {
4636 #ifdef CONFIG_RFS_ACCEL
4639 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
4640 * @dev: Device on which the filter was set
4641 * @rxq_index: RX queue index
4642 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
4643 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
4645 * Drivers that implement ndo_rx_flow_steer() should periodically call
4646 * this function for each installed filter and remove the filters for
4647 * which it returns %true.
4649 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
4650 u32 flow_id, u16 filter_id)
4652 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
4653 struct rps_dev_flow_table *flow_table;
4654 struct rps_dev_flow *rflow;
4659 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4660 if (flow_table && flow_id <= flow_table->mask) {
4661 rflow = &flow_table->flows[flow_id];
4662 cpu = READ_ONCE(rflow->cpu);
4663 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
4664 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
4665 rflow->last_qtail) <
4666 (int)(10 * flow_table->mask)))
4672 EXPORT_SYMBOL(rps_may_expire_flow);
4674 #endif /* CONFIG_RFS_ACCEL */
4676 /* Called from hardirq (IPI) context */
4677 static void rps_trigger_softirq(void *data)
4679 struct softnet_data *sd = data;
4681 ____napi_schedule(sd, &sd->backlog);
4685 #endif /* CONFIG_RPS */
4687 /* Called from hardirq (IPI) context */
4688 static void trigger_rx_softirq(void *data)
4690 struct softnet_data *sd = data;
4692 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4693 smp_store_release(&sd->defer_ipi_scheduled, 0);
4697 * After we queued a packet into sd->input_pkt_queue,
4698 * we need to make sure this queue is serviced soon.
4700 * - If this is another cpu queue, link it to our rps_ipi_list,
4701 * and make sure we will process rps_ipi_list from net_rx_action().
4703 * - If this is our own queue, NAPI schedule our backlog.
4704 * Note that this also raises NET_RX_SOFTIRQ.
4706 static void napi_schedule_rps(struct softnet_data *sd)
4708 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
4712 sd->rps_ipi_next = mysd->rps_ipi_list;
4713 mysd->rps_ipi_list = sd;
4715 /* If not called from net_rx_action() or napi_threaded_poll()
4716 * we have to raise NET_RX_SOFTIRQ.
4718 if (!mysd->in_net_rx_action && !mysd->in_napi_threaded_poll)
4719 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4722 #endif /* CONFIG_RPS */
4723 __napi_schedule_irqoff(&mysd->backlog);
4726 #ifdef CONFIG_NET_FLOW_LIMIT
4727 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
4730 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
4732 #ifdef CONFIG_NET_FLOW_LIMIT
4733 struct sd_flow_limit *fl;
4734 struct softnet_data *sd;
4735 unsigned int old_flow, new_flow;
4737 if (qlen < (READ_ONCE(netdev_max_backlog) >> 1))
4740 sd = this_cpu_ptr(&softnet_data);
4743 fl = rcu_dereference(sd->flow_limit);
4745 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
4746 old_flow = fl->history[fl->history_head];
4747 fl->history[fl->history_head] = new_flow;
4750 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
4752 if (likely(fl->buckets[old_flow]))
4753 fl->buckets[old_flow]--;
4755 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
4767 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
4768 * queue (may be a remote CPU queue).
4770 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
4771 unsigned int *qtail)
4773 enum skb_drop_reason reason;
4774 struct softnet_data *sd;
4775 unsigned long flags;
4778 reason = SKB_DROP_REASON_NOT_SPECIFIED;
4779 sd = &per_cpu(softnet_data, cpu);
4781 rps_lock_irqsave(sd, &flags);
4782 if (!netif_running(skb->dev))
4784 qlen = skb_queue_len(&sd->input_pkt_queue);
4785 if (qlen <= READ_ONCE(netdev_max_backlog) && !skb_flow_limit(skb, qlen)) {
4788 __skb_queue_tail(&sd->input_pkt_queue, skb);
4789 input_queue_tail_incr_save(sd, qtail);
4790 rps_unlock_irq_restore(sd, &flags);
4791 return NET_RX_SUCCESS;
4794 /* Schedule NAPI for backlog device
4795 * We can use non atomic operation since we own the queue lock
4797 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state))
4798 napi_schedule_rps(sd);
4801 reason = SKB_DROP_REASON_CPU_BACKLOG;
4805 rps_unlock_irq_restore(sd, &flags);
4807 dev_core_stats_rx_dropped_inc(skb->dev);
4808 kfree_skb_reason(skb, reason);
4812 static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb)
4814 struct net_device *dev = skb->dev;
4815 struct netdev_rx_queue *rxqueue;
4819 if (skb_rx_queue_recorded(skb)) {
4820 u16 index = skb_get_rx_queue(skb);
4822 if (unlikely(index >= dev->real_num_rx_queues)) {
4823 WARN_ONCE(dev->real_num_rx_queues > 1,
4824 "%s received packet on queue %u, but number "
4825 "of RX queues is %u\n",
4826 dev->name, index, dev->real_num_rx_queues);
4828 return rxqueue; /* Return first rxqueue */
4835 u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp,
4836 struct bpf_prog *xdp_prog)
4838 void *orig_data, *orig_data_end, *hard_start;
4839 struct netdev_rx_queue *rxqueue;
4840 bool orig_bcast, orig_host;
4841 u32 mac_len, frame_sz;
4842 __be16 orig_eth_type;
4847 /* The XDP program wants to see the packet starting at the MAC
4850 mac_len = skb->data - skb_mac_header(skb);
4851 hard_start = skb->data - skb_headroom(skb);
4853 /* SKB "head" area always have tailroom for skb_shared_info */
4854 frame_sz = (void *)skb_end_pointer(skb) - hard_start;
4855 frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
4857 rxqueue = netif_get_rxqueue(skb);
4858 xdp_init_buff(xdp, frame_sz, &rxqueue->xdp_rxq);
4859 xdp_prepare_buff(xdp, hard_start, skb_headroom(skb) - mac_len,
4860 skb_headlen(skb) + mac_len, true);
4862 orig_data_end = xdp->data_end;
4863 orig_data = xdp->data;
4864 eth = (struct ethhdr *)xdp->data;
4865 orig_host = ether_addr_equal_64bits(eth->h_dest, skb->dev->dev_addr);
4866 orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest);
4867 orig_eth_type = eth->h_proto;
4869 act = bpf_prog_run_xdp(xdp_prog, xdp);
4871 /* check if bpf_xdp_adjust_head was used */
4872 off = xdp->data - orig_data;
4875 __skb_pull(skb, off);
4877 __skb_push(skb, -off);
4879 skb->mac_header += off;
4880 skb_reset_network_header(skb);
4883 /* check if bpf_xdp_adjust_tail was used */
4884 off = xdp->data_end - orig_data_end;
4886 skb_set_tail_pointer(skb, xdp->data_end - xdp->data);
4887 skb->len += off; /* positive on grow, negative on shrink */
4890 /* check if XDP changed eth hdr such SKB needs update */
4891 eth = (struct ethhdr *)xdp->data;
4892 if ((orig_eth_type != eth->h_proto) ||
4893 (orig_host != ether_addr_equal_64bits(eth->h_dest,
4894 skb->dev->dev_addr)) ||
4895 (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) {
4896 __skb_push(skb, ETH_HLEN);
4897 skb->pkt_type = PACKET_HOST;
4898 skb->protocol = eth_type_trans(skb, skb->dev);
4901 /* Redirect/Tx gives L2 packet, code that will reuse skb must __skb_pull
4902 * before calling us again on redirect path. We do not call do_redirect
4903 * as we leave that up to the caller.
4905 * Caller is responsible for managing lifetime of skb (i.e. calling
4906 * kfree_skb in response to actions it cannot handle/XDP_DROP).
4911 __skb_push(skb, mac_len);
4914 metalen = xdp->data - xdp->data_meta;
4916 skb_metadata_set(skb, metalen);
4923 static u32 netif_receive_generic_xdp(struct sk_buff *skb,
4924 struct xdp_buff *xdp,
4925 struct bpf_prog *xdp_prog)
4929 /* Reinjected packets coming from act_mirred or similar should
4930 * not get XDP generic processing.
4932 if (skb_is_redirected(skb))
4935 /* XDP packets must be linear and must have sufficient headroom
4936 * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also
4937 * native XDP provides, thus we need to do it here as well.
4939 if (skb_cloned(skb) || skb_is_nonlinear(skb) ||
4940 skb_headroom(skb) < XDP_PACKET_HEADROOM) {
4941 int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb);
4942 int troom = skb->tail + skb->data_len - skb->end;
4944 /* In case we have to go down the path and also linearize,
4945 * then lets do the pskb_expand_head() work just once here.
4947 if (pskb_expand_head(skb,
4948 hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0,
4949 troom > 0 ? troom + 128 : 0, GFP_ATOMIC))
4951 if (skb_linearize(skb))
4955 act = bpf_prog_run_generic_xdp(skb, xdp, xdp_prog);
4962 bpf_warn_invalid_xdp_action(skb->dev, xdp_prog, act);
4965 trace_xdp_exception(skb->dev, xdp_prog, act);
4976 /* When doing generic XDP we have to bypass the qdisc layer and the
4977 * network taps in order to match in-driver-XDP behavior. This also means
4978 * that XDP packets are able to starve other packets going through a qdisc,
4979 * and DDOS attacks will be more effective. In-driver-XDP use dedicated TX
4980 * queues, so they do not have this starvation issue.
4982 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog)
4984 struct net_device *dev = skb->dev;
4985 struct netdev_queue *txq;
4986 bool free_skb = true;
4989 txq = netdev_core_pick_tx(dev, skb, NULL);
4990 cpu = smp_processor_id();
4991 HARD_TX_LOCK(dev, txq, cpu);
4992 if (!netif_xmit_frozen_or_drv_stopped(txq)) {
4993 rc = netdev_start_xmit(skb, dev, txq, 0);
4994 if (dev_xmit_complete(rc))
4997 HARD_TX_UNLOCK(dev, txq);
4999 trace_xdp_exception(dev, xdp_prog, XDP_TX);
5000 dev_core_stats_tx_dropped_inc(dev);
5005 static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key);
5007 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb)
5010 struct xdp_buff xdp;
5014 act = netif_receive_generic_xdp(skb, &xdp, xdp_prog);
5015 if (act != XDP_PASS) {
5018 err = xdp_do_generic_redirect(skb->dev, skb,
5024 generic_xdp_tx(skb, xdp_prog);
5032 kfree_skb_reason(skb, SKB_DROP_REASON_XDP);
5035 EXPORT_SYMBOL_GPL(do_xdp_generic);
5037 static int netif_rx_internal(struct sk_buff *skb)
5041 net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb);
5043 trace_netif_rx(skb);
5046 if (static_branch_unlikely(&rps_needed)) {
5047 struct rps_dev_flow voidflow, *rflow = &voidflow;
5052 cpu = get_rps_cpu(skb->dev, skb, &rflow);
5054 cpu = smp_processor_id();
5056 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5064 ret = enqueue_to_backlog(skb, smp_processor_id(), &qtail);
5070 * __netif_rx - Slightly optimized version of netif_rx
5071 * @skb: buffer to post
5073 * This behaves as netif_rx except that it does not disable bottom halves.
5074 * As a result this function may only be invoked from the interrupt context
5075 * (either hard or soft interrupt).
5077 int __netif_rx(struct sk_buff *skb)
5081 lockdep_assert_once(hardirq_count() | softirq_count());
5083 trace_netif_rx_entry(skb);
5084 ret = netif_rx_internal(skb);
5085 trace_netif_rx_exit(ret);
5088 EXPORT_SYMBOL(__netif_rx);
5091 * netif_rx - post buffer to the network code
5092 * @skb: buffer to post
5094 * This function receives a packet from a device driver and queues it for
5095 * the upper (protocol) levels to process via the backlog NAPI device. It
5096 * always succeeds. The buffer may be dropped during processing for
5097 * congestion control or by the protocol layers.
5098 * The network buffer is passed via the backlog NAPI device. Modern NIC
5099 * driver should use NAPI and GRO.
5100 * This function can used from interrupt and from process context. The
5101 * caller from process context must not disable interrupts before invoking
5105 * NET_RX_SUCCESS (no congestion)
5106 * NET_RX_DROP (packet was dropped)
5109 int netif_rx(struct sk_buff *skb)
5111 bool need_bh_off = !(hardirq_count() | softirq_count());
5116 trace_netif_rx_entry(skb);
5117 ret = netif_rx_internal(skb);
5118 trace_netif_rx_exit(ret);
5123 EXPORT_SYMBOL(netif_rx);
5125 static __latent_entropy void net_tx_action(struct softirq_action *h)
5127 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
5129 if (sd->completion_queue) {
5130 struct sk_buff *clist;
5132 local_irq_disable();
5133 clist = sd->completion_queue;
5134 sd->completion_queue = NULL;
5138 struct sk_buff *skb = clist;
5140 clist = clist->next;
5142 WARN_ON(refcount_read(&skb->users));
5143 if (likely(get_kfree_skb_cb(skb)->reason == SKB_CONSUMED))
5144 trace_consume_skb(skb, net_tx_action);
5146 trace_kfree_skb(skb, net_tx_action,
5147 get_kfree_skb_cb(skb)->reason);
5149 if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
5152 __napi_kfree_skb(skb,
5153 get_kfree_skb_cb(skb)->reason);
5157 if (sd->output_queue) {
5160 local_irq_disable();
5161 head = sd->output_queue;
5162 sd->output_queue = NULL;
5163 sd->output_queue_tailp = &sd->output_queue;
5169 struct Qdisc *q = head;
5170 spinlock_t *root_lock = NULL;
5172 head = head->next_sched;
5174 /* We need to make sure head->next_sched is read
5175 * before clearing __QDISC_STATE_SCHED
5177 smp_mb__before_atomic();
5179 if (!(q->flags & TCQ_F_NOLOCK)) {
5180 root_lock = qdisc_lock(q);
5181 spin_lock(root_lock);
5182 } else if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED,
5184 /* There is a synchronize_net() between
5185 * STATE_DEACTIVATED flag being set and
5186 * qdisc_reset()/some_qdisc_is_busy() in
5187 * dev_deactivate(), so we can safely bail out
5188 * early here to avoid data race between
5189 * qdisc_deactivate() and some_qdisc_is_busy()
5190 * for lockless qdisc.
5192 clear_bit(__QDISC_STATE_SCHED, &q->state);
5196 clear_bit(__QDISC_STATE_SCHED, &q->state);
5199 spin_unlock(root_lock);
5205 xfrm_dev_backlog(sd);
5208 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE)
5209 /* This hook is defined here for ATM LANE */
5210 int (*br_fdb_test_addr_hook)(struct net_device *dev,
5211 unsigned char *addr) __read_mostly;
5212 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
5216 * netdev_is_rx_handler_busy - check if receive handler is registered
5217 * @dev: device to check
5219 * Check if a receive handler is already registered for a given device.
5220 * Return true if there one.
5222 * The caller must hold the rtnl_mutex.
5224 bool netdev_is_rx_handler_busy(struct net_device *dev)
5227 return dev && rtnl_dereference(dev->rx_handler);
5229 EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);
5232 * netdev_rx_handler_register - register receive handler
5233 * @dev: device to register a handler for
5234 * @rx_handler: receive handler to register
5235 * @rx_handler_data: data pointer that is used by rx handler
5237 * Register a receive handler for a device. This handler will then be
5238 * called from __netif_receive_skb. A negative errno code is returned
5241 * The caller must hold the rtnl_mutex.
5243 * For a general description of rx_handler, see enum rx_handler_result.
5245 int netdev_rx_handler_register(struct net_device *dev,
5246 rx_handler_func_t *rx_handler,
5247 void *rx_handler_data)
5249 if (netdev_is_rx_handler_busy(dev))
5252 if (dev->priv_flags & IFF_NO_RX_HANDLER)
5255 /* Note: rx_handler_data must be set before rx_handler */
5256 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
5257 rcu_assign_pointer(dev->rx_handler, rx_handler);
5261 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
5264 * netdev_rx_handler_unregister - unregister receive handler
5265 * @dev: device to unregister a handler from
5267 * Unregister a receive handler from a device.
5269 * The caller must hold the rtnl_mutex.
5271 void netdev_rx_handler_unregister(struct net_device *dev)
5275 RCU_INIT_POINTER(dev->rx_handler, NULL);
5276 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
5277 * section has a guarantee to see a non NULL rx_handler_data
5281 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
5283 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
5286 * Limit the use of PFMEMALLOC reserves to those protocols that implement
5287 * the special handling of PFMEMALLOC skbs.
5289 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
5291 switch (skb->protocol) {
5292 case htons(ETH_P_ARP):
5293 case htons(ETH_P_IP):
5294 case htons(ETH_P_IPV6):
5295 case htons(ETH_P_8021Q):
5296 case htons(ETH_P_8021AD):
5303 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
5304 int *ret, struct net_device *orig_dev)
5306 if (nf_hook_ingress_active(skb)) {
5310 *ret = deliver_skb(skb, *pt_prev, orig_dev);
5315 ingress_retval = nf_hook_ingress(skb);
5317 return ingress_retval;
5322 static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
5323 struct packet_type **ppt_prev)
5325 struct packet_type *ptype, *pt_prev;
5326 rx_handler_func_t *rx_handler;
5327 struct sk_buff *skb = *pskb;
5328 struct net_device *orig_dev;
5329 bool deliver_exact = false;
5330 int ret = NET_RX_DROP;
5333 net_timestamp_check(!READ_ONCE(netdev_tstamp_prequeue), skb);
5335 trace_netif_receive_skb(skb);
5337 orig_dev = skb->dev;
5339 skb_reset_network_header(skb);
5340 if (!skb_transport_header_was_set(skb))
5341 skb_reset_transport_header(skb);
5342 skb_reset_mac_len(skb);
5347 skb->skb_iif = skb->dev->ifindex;
5349 __this_cpu_inc(softnet_data.processed);
5351 if (static_branch_unlikely(&generic_xdp_needed_key)) {
5355 ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
5358 if (ret2 != XDP_PASS) {
5364 if (eth_type_vlan(skb->protocol)) {
5365 skb = skb_vlan_untag(skb);
5370 if (skb_skip_tc_classify(skb))
5376 list_for_each_entry_rcu(ptype, &ptype_all, list) {
5378 ret = deliver_skb(skb, pt_prev, orig_dev);
5382 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
5384 ret = deliver_skb(skb, pt_prev, orig_dev);
5389 #ifdef CONFIG_NET_INGRESS
5390 if (static_branch_unlikely(&ingress_needed_key)) {
5391 bool another = false;
5393 nf_skip_egress(skb, true);
5394 skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev,
5401 nf_skip_egress(skb, false);
5402 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
5406 skb_reset_redirect(skb);
5408 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
5411 if (skb_vlan_tag_present(skb)) {
5413 ret = deliver_skb(skb, pt_prev, orig_dev);
5416 if (vlan_do_receive(&skb))
5418 else if (unlikely(!skb))
5422 rx_handler = rcu_dereference(skb->dev->rx_handler);
5425 ret = deliver_skb(skb, pt_prev, orig_dev);
5428 switch (rx_handler(&skb)) {
5429 case RX_HANDLER_CONSUMED:
5430 ret = NET_RX_SUCCESS;
5432 case RX_HANDLER_ANOTHER:
5434 case RX_HANDLER_EXACT:
5435 deliver_exact = true;
5437 case RX_HANDLER_PASS:
5444 if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) {
5446 if (skb_vlan_tag_get_id(skb)) {
5447 /* Vlan id is non 0 and vlan_do_receive() above couldn't
5450 skb->pkt_type = PACKET_OTHERHOST;
5451 } else if (eth_type_vlan(skb->protocol)) {
5452 /* Outer header is 802.1P with vlan 0, inner header is
5453 * 802.1Q or 802.1AD and vlan_do_receive() above could
5454 * not find vlan dev for vlan id 0.
5456 __vlan_hwaccel_clear_tag(skb);
5457 skb = skb_vlan_untag(skb);
5460 if (vlan_do_receive(&skb))
5461 /* After stripping off 802.1P header with vlan 0
5462 * vlan dev is found for inner header.
5465 else if (unlikely(!skb))
5468 /* We have stripped outer 802.1P vlan 0 header.
5469 * But could not find vlan dev.
5470 * check again for vlan id to set OTHERHOST.
5474 /* Note: we might in the future use prio bits
5475 * and set skb->priority like in vlan_do_receive()
5476 * For the time being, just ignore Priority Code Point
5478 __vlan_hwaccel_clear_tag(skb);
5481 type = skb->protocol;
5483 /* deliver only exact match when indicated */
5484 if (likely(!deliver_exact)) {
5485 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
5486 &ptype_base[ntohs(type) &
5490 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
5491 &orig_dev->ptype_specific);
5493 if (unlikely(skb->dev != orig_dev)) {
5494 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
5495 &skb->dev->ptype_specific);
5499 if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
5501 *ppt_prev = pt_prev;
5505 dev_core_stats_rx_dropped_inc(skb->dev);
5507 dev_core_stats_rx_nohandler_inc(skb->dev);
5508 kfree_skb_reason(skb, SKB_DROP_REASON_UNHANDLED_PROTO);
5509 /* Jamal, now you will not able to escape explaining
5510 * me how you were going to use this. :-)
5516 /* The invariant here is that if *ppt_prev is not NULL
5517 * then skb should also be non-NULL.
5519 * Apparently *ppt_prev assignment above holds this invariant due to
5520 * skb dereferencing near it.
5526 static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc)
5528 struct net_device *orig_dev = skb->dev;
5529 struct packet_type *pt_prev = NULL;
5532 ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev);
5534 ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb,
5535 skb->dev, pt_prev, orig_dev);
5540 * netif_receive_skb_core - special purpose version of netif_receive_skb
5541 * @skb: buffer to process
5543 * More direct receive version of netif_receive_skb(). It should
5544 * only be used by callers that have a need to skip RPS and Generic XDP.
5545 * Caller must also take care of handling if ``(page_is_)pfmemalloc``.
5547 * This function may only be called from softirq context and interrupts
5548 * should be enabled.
5550 * Return values (usually ignored):
5551 * NET_RX_SUCCESS: no congestion
5552 * NET_RX_DROP: packet was dropped
5554 int netif_receive_skb_core(struct sk_buff *skb)
5559 ret = __netif_receive_skb_one_core(skb, false);
5564 EXPORT_SYMBOL(netif_receive_skb_core);
5566 static inline void __netif_receive_skb_list_ptype(struct list_head *head,
5567 struct packet_type *pt_prev,
5568 struct net_device *orig_dev)
5570 struct sk_buff *skb, *next;
5574 if (list_empty(head))
5576 if (pt_prev->list_func != NULL)
5577 INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv,
5578 ip_list_rcv, head, pt_prev, orig_dev);
5580 list_for_each_entry_safe(skb, next, head, list) {
5581 skb_list_del_init(skb);
5582 pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
5586 static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc)
5588 /* Fast-path assumptions:
5589 * - There is no RX handler.
5590 * - Only one packet_type matches.
5591 * If either of these fails, we will end up doing some per-packet
5592 * processing in-line, then handling the 'last ptype' for the whole
5593 * sublist. This can't cause out-of-order delivery to any single ptype,
5594 * because the 'last ptype' must be constant across the sublist, and all
5595 * other ptypes are handled per-packet.
5597 /* Current (common) ptype of sublist */
5598 struct packet_type *pt_curr = NULL;
5599 /* Current (common) orig_dev of sublist */
5600 struct net_device *od_curr = NULL;
5601 struct list_head sublist;
5602 struct sk_buff *skb, *next;
5604 INIT_LIST_HEAD(&sublist);
5605 list_for_each_entry_safe(skb, next, head, list) {
5606 struct net_device *orig_dev = skb->dev;
5607 struct packet_type *pt_prev = NULL;
5609 skb_list_del_init(skb);
5610 __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev);
5613 if (pt_curr != pt_prev || od_curr != orig_dev) {
5614 /* dispatch old sublist */
5615 __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);
5616 /* start new sublist */
5617 INIT_LIST_HEAD(&sublist);
5621 list_add_tail(&skb->list, &sublist);
5624 /* dispatch final sublist */
5625 __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);
5628 static int __netif_receive_skb(struct sk_buff *skb)
5632 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
5633 unsigned int noreclaim_flag;
5636 * PFMEMALLOC skbs are special, they should
5637 * - be delivered to SOCK_MEMALLOC sockets only
5638 * - stay away from userspace
5639 * - have bounded memory usage
5641 * Use PF_MEMALLOC as this saves us from propagating the allocation
5642 * context down to all allocation sites.
5644 noreclaim_flag = memalloc_noreclaim_save();
5645 ret = __netif_receive_skb_one_core(skb, true);
5646 memalloc_noreclaim_restore(noreclaim_flag);
5648 ret = __netif_receive_skb_one_core(skb, false);
5653 static void __netif_receive_skb_list(struct list_head *head)
5655 unsigned long noreclaim_flag = 0;
5656 struct sk_buff *skb, *next;
5657 bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */
5659 list_for_each_entry_safe(skb, next, head, list) {
5660 if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) {
5661 struct list_head sublist;
5663 /* Handle the previous sublist */
5664 list_cut_before(&sublist, head, &skb->list);
5665 if (!list_empty(&sublist))
5666 __netif_receive_skb_list_core(&sublist, pfmemalloc);
5667 pfmemalloc = !pfmemalloc;
5668 /* See comments in __netif_receive_skb */
5670 noreclaim_flag = memalloc_noreclaim_save();
5672 memalloc_noreclaim_restore(noreclaim_flag);
5675 /* Handle the remaining sublist */
5676 if (!list_empty(head))
5677 __netif_receive_skb_list_core(head, pfmemalloc);
5678 /* Restore pflags */
5680 memalloc_noreclaim_restore(noreclaim_flag);
5683 static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
5685 struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
5686 struct bpf_prog *new = xdp->prog;
5689 switch (xdp->command) {
5690 case XDP_SETUP_PROG:
5691 rcu_assign_pointer(dev->xdp_prog, new);
5696 static_branch_dec(&generic_xdp_needed_key);
5697 } else if (new && !old) {
5698 static_branch_inc(&generic_xdp_needed_key);
5699 dev_disable_lro(dev);
5700 dev_disable_gro_hw(dev);
5712 static int netif_receive_skb_internal(struct sk_buff *skb)
5716 net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb);
5718 if (skb_defer_rx_timestamp(skb))
5719 return NET_RX_SUCCESS;
5723 if (static_branch_unlikely(&rps_needed)) {
5724 struct rps_dev_flow voidflow, *rflow = &voidflow;
5725 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
5728 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5734 ret = __netif_receive_skb(skb);
5739 void netif_receive_skb_list_internal(struct list_head *head)
5741 struct sk_buff *skb, *next;
5742 struct list_head sublist;
5744 INIT_LIST_HEAD(&sublist);
5745 list_for_each_entry_safe(skb, next, head, list) {
5746 net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb);
5747 skb_list_del_init(skb);
5748 if (!skb_defer_rx_timestamp(skb))
5749 list_add_tail(&skb->list, &sublist);
5751 list_splice_init(&sublist, head);
5755 if (static_branch_unlikely(&rps_needed)) {
5756 list_for_each_entry_safe(skb, next, head, list) {
5757 struct rps_dev_flow voidflow, *rflow = &voidflow;
5758 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
5761 /* Will be handled, remove from list */
5762 skb_list_del_init(skb);
5763 enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5768 __netif_receive_skb_list(head);
5773 * netif_receive_skb - process receive buffer from network
5774 * @skb: buffer to process
5776 * netif_receive_skb() is the main receive data processing function.
5777 * It always succeeds. The buffer may be dropped during processing
5778 * for congestion control or by the protocol layers.
5780 * This function may only be called from softirq context and interrupts
5781 * should be enabled.
5783 * Return values (usually ignored):
5784 * NET_RX_SUCCESS: no congestion
5785 * NET_RX_DROP: packet was dropped
5787 int netif_receive_skb(struct sk_buff *skb)
5791 trace_netif_receive_skb_entry(skb);
5793 ret = netif_receive_skb_internal(skb);
5794 trace_netif_receive_skb_exit(ret);
5798 EXPORT_SYMBOL(netif_receive_skb);
5801 * netif_receive_skb_list - process many receive buffers from network
5802 * @head: list of skbs to process.
5804 * Since return value of netif_receive_skb() is normally ignored, and
5805 * wouldn't be meaningful for a list, this function returns void.
5807 * This function may only be called from softirq context and interrupts
5808 * should be enabled.
5810 void netif_receive_skb_list(struct list_head *head)
5812 struct sk_buff *skb;
5814 if (list_empty(head))
5816 if (trace_netif_receive_skb_list_entry_enabled()) {
5817 list_for_each_entry(skb, head, list)
5818 trace_netif_receive_skb_list_entry(skb);
5820 netif_receive_skb_list_internal(head);
5821 trace_netif_receive_skb_list_exit(0);
5823 EXPORT_SYMBOL(netif_receive_skb_list);
5825 static DEFINE_PER_CPU(struct work_struct, flush_works);
5827 /* Network device is going away, flush any packets still pending */
5828 static void flush_backlog(struct work_struct *work)
5830 struct sk_buff *skb, *tmp;
5831 struct softnet_data *sd;
5834 sd = this_cpu_ptr(&softnet_data);
5836 rps_lock_irq_disable(sd);
5837 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
5838 if (skb->dev->reg_state == NETREG_UNREGISTERING) {
5839 __skb_unlink(skb, &sd->input_pkt_queue);
5840 dev_kfree_skb_irq(skb);
5841 input_queue_head_incr(sd);
5844 rps_unlock_irq_enable(sd);
5846 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
5847 if (skb->dev->reg_state == NETREG_UNREGISTERING) {
5848 __skb_unlink(skb, &sd->process_queue);
5850 input_queue_head_incr(sd);
5856 static bool flush_required(int cpu)
5858 #if IS_ENABLED(CONFIG_RPS)
5859 struct softnet_data *sd = &per_cpu(softnet_data, cpu);
5862 rps_lock_irq_disable(sd);
5864 /* as insertion into process_queue happens with the rps lock held,
5865 * process_queue access may race only with dequeue
5867 do_flush = !skb_queue_empty(&sd->input_pkt_queue) ||
5868 !skb_queue_empty_lockless(&sd->process_queue);
5869 rps_unlock_irq_enable(sd);
5873 /* without RPS we can't safely check input_pkt_queue: during a
5874 * concurrent remote skb_queue_splice() we can detect as empty both
5875 * input_pkt_queue and process_queue even if the latter could end-up
5876 * containing a lot of packets.
5881 static void flush_all_backlogs(void)
5883 static cpumask_t flush_cpus;
5886 /* since we are under rtnl lock protection we can use static data
5887 * for the cpumask and avoid allocating on stack the possibly
5894 cpumask_clear(&flush_cpus);
5895 for_each_online_cpu(cpu) {
5896 if (flush_required(cpu)) {
5897 queue_work_on(cpu, system_highpri_wq,
5898 per_cpu_ptr(&flush_works, cpu));
5899 cpumask_set_cpu(cpu, &flush_cpus);
5903 /* we can have in flight packet[s] on the cpus we are not flushing,
5904 * synchronize_net() in unregister_netdevice_many() will take care of
5907 for_each_cpu(cpu, &flush_cpus)
5908 flush_work(per_cpu_ptr(&flush_works, cpu));
5913 static void net_rps_send_ipi(struct softnet_data *remsd)
5917 struct softnet_data *next = remsd->rps_ipi_next;
5919 if (cpu_online(remsd->cpu))
5920 smp_call_function_single_async(remsd->cpu, &remsd->csd);
5927 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
5928 * Note: called with local irq disabled, but exits with local irq enabled.
5930 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
5933 struct softnet_data *remsd = sd->rps_ipi_list;
5936 sd->rps_ipi_list = NULL;
5940 /* Send pending IPI's to kick RPS processing on remote cpus. */
5941 net_rps_send_ipi(remsd);
5947 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
5950 return sd->rps_ipi_list != NULL;
5956 static int process_backlog(struct napi_struct *napi, int quota)
5958 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
5962 /* Check if we have pending ipi, its better to send them now,
5963 * not waiting net_rx_action() end.
5965 if (sd_has_rps_ipi_waiting(sd)) {
5966 local_irq_disable();
5967 net_rps_action_and_irq_enable(sd);
5970 napi->weight = READ_ONCE(dev_rx_weight);
5972 struct sk_buff *skb;
5974 while ((skb = __skb_dequeue(&sd->process_queue))) {
5976 __netif_receive_skb(skb);
5978 input_queue_head_incr(sd);
5979 if (++work >= quota)
5984 rps_lock_irq_disable(sd);
5985 if (skb_queue_empty(&sd->input_pkt_queue)) {
5987 * Inline a custom version of __napi_complete().
5988 * only current cpu owns and manipulates this napi,
5989 * and NAPI_STATE_SCHED is the only possible flag set
5991 * We can use a plain write instead of clear_bit(),
5992 * and we dont need an smp_mb() memory barrier.
5997 skb_queue_splice_tail_init(&sd->input_pkt_queue,
5998 &sd->process_queue);
6000 rps_unlock_irq_enable(sd);
6007 * __napi_schedule - schedule for receive
6008 * @n: entry to schedule
6010 * The entry's receive function will be scheduled to run.
6011 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
6013 void __napi_schedule(struct napi_struct *n)
6015 unsigned long flags;
6017 local_irq_save(flags);
6018 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
6019 local_irq_restore(flags);
6021 EXPORT_SYMBOL(__napi_schedule);
6024 * napi_schedule_prep - check if napi can be scheduled
6027 * Test if NAPI routine is already running, and if not mark
6028 * it as running. This is used as a condition variable to
6029 * insure only one NAPI poll instance runs. We also make
6030 * sure there is no pending NAPI disable.
6032 bool napi_schedule_prep(struct napi_struct *n)
6034 unsigned long new, val = READ_ONCE(n->state);
6037 if (unlikely(val & NAPIF_STATE_DISABLE))
6039 new = val | NAPIF_STATE_SCHED;
6041 /* Sets STATE_MISSED bit if STATE_SCHED was already set
6042 * This was suggested by Alexander Duyck, as compiler
6043 * emits better code than :
6044 * if (val & NAPIF_STATE_SCHED)
6045 * new |= NAPIF_STATE_MISSED;
6047 new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED *
6049 } while (!try_cmpxchg(&n->state, &val, new));
6051 return !(val & NAPIF_STATE_SCHED);
6053 EXPORT_SYMBOL(napi_schedule_prep);
6056 * __napi_schedule_irqoff - schedule for receive
6057 * @n: entry to schedule
6059 * Variant of __napi_schedule() assuming hard irqs are masked.
6061 * On PREEMPT_RT enabled kernels this maps to __napi_schedule()
6062 * because the interrupt disabled assumption might not be true
6063 * due to force-threaded interrupts and spinlock substitution.
6065 void __napi_schedule_irqoff(struct napi_struct *n)
6067 if (!IS_ENABLED(CONFIG_PREEMPT_RT))
6068 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
6072 EXPORT_SYMBOL(__napi_schedule_irqoff);
6074 bool napi_complete_done(struct napi_struct *n, int work_done)
6076 unsigned long flags, val, new, timeout = 0;
6080 * 1) Don't let napi dequeue from the cpu poll list
6081 * just in case its running on a different cpu.
6082 * 2) If we are busy polling, do nothing here, we have
6083 * the guarantee we will be called later.
6085 if (unlikely(n->state & (NAPIF_STATE_NPSVC |
6086 NAPIF_STATE_IN_BUSY_POLL)))
6091 timeout = READ_ONCE(n->dev->gro_flush_timeout);
6092 n->defer_hard_irqs_count = READ_ONCE(n->dev->napi_defer_hard_irqs);
6094 if (n->defer_hard_irqs_count > 0) {
6095 n->defer_hard_irqs_count--;
6096 timeout = READ_ONCE(n->dev->gro_flush_timeout);
6100 if (n->gro_bitmask) {
6101 /* When the NAPI instance uses a timeout and keeps postponing
6102 * it, we need to bound somehow the time packets are kept in
6105 napi_gro_flush(n, !!timeout);
6110 if (unlikely(!list_empty(&n->poll_list))) {
6111 /* If n->poll_list is not empty, we need to mask irqs */
6112 local_irq_save(flags);
6113 list_del_init(&n->poll_list);
6114 local_irq_restore(flags);
6116 WRITE_ONCE(n->list_owner, -1);
6118 val = READ_ONCE(n->state);
6120 WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED));
6122 new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED |
6123 NAPIF_STATE_SCHED_THREADED |
6124 NAPIF_STATE_PREFER_BUSY_POLL);
6126 /* If STATE_MISSED was set, leave STATE_SCHED set,
6127 * because we will call napi->poll() one more time.
6128 * This C code was suggested by Alexander Duyck to help gcc.
6130 new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED *
6132 } while (!try_cmpxchg(&n->state, &val, new));
6134 if (unlikely(val & NAPIF_STATE_MISSED)) {
6140 hrtimer_start(&n->timer, ns_to_ktime(timeout),
6141 HRTIMER_MODE_REL_PINNED);
6144 EXPORT_SYMBOL(napi_complete_done);
6146 /* must be called under rcu_read_lock(), as we dont take a reference */
6147 struct napi_struct *napi_by_id(unsigned int napi_id)
6149 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
6150 struct napi_struct *napi;
6152 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
6153 if (napi->napi_id == napi_id)
6159 #if defined(CONFIG_NET_RX_BUSY_POLL)
6161 static void __busy_poll_stop(struct napi_struct *napi, bool skip_schedule)
6163 if (!skip_schedule) {
6164 gro_normal_list(napi);
6165 __napi_schedule(napi);
6169 if (napi->gro_bitmask) {
6170 /* flush too old packets
6171 * If HZ < 1000, flush all packets.
6173 napi_gro_flush(napi, HZ >= 1000);
6176 gro_normal_list(napi);
6177 clear_bit(NAPI_STATE_SCHED, &napi->state);
6181 NAPI_F_PREFER_BUSY_POLL = 1,
6182 NAPI_F_END_ON_RESCHED = 2,
6185 static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock,
6186 unsigned flags, u16 budget)
6188 bool skip_schedule = false;
6189 unsigned long timeout;
6192 /* Busy polling means there is a high chance device driver hard irq
6193 * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was
6194 * set in napi_schedule_prep().
6195 * Since we are about to call napi->poll() once more, we can safely
6196 * clear NAPI_STATE_MISSED.
6198 * Note: x86 could use a single "lock and ..." instruction
6199 * to perform these two clear_bit()
6201 clear_bit(NAPI_STATE_MISSED, &napi->state);
6202 clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state);
6206 if (flags & NAPI_F_PREFER_BUSY_POLL) {
6207 napi->defer_hard_irqs_count = READ_ONCE(napi->dev->napi_defer_hard_irqs);
6208 timeout = READ_ONCE(napi->dev->gro_flush_timeout);
6209 if (napi->defer_hard_irqs_count && timeout) {
6210 hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED);
6211 skip_schedule = true;
6215 /* All we really want here is to re-enable device interrupts.
6216 * Ideally, a new ndo_busy_poll_stop() could avoid another round.
6218 rc = napi->poll(napi, budget);
6219 /* We can't gro_normal_list() here, because napi->poll() might have
6220 * rearmed the napi (napi_complete_done()) in which case it could
6221 * already be running on another CPU.
6223 trace_napi_poll(napi, rc, budget);
6224 netpoll_poll_unlock(have_poll_lock);
6226 __busy_poll_stop(napi, skip_schedule);
6230 static void __napi_busy_loop(unsigned int napi_id,
6231 bool (*loop_end)(void *, unsigned long),
6232 void *loop_end_arg, unsigned flags, u16 budget)
6234 unsigned long start_time = loop_end ? busy_loop_current_time() : 0;
6235 int (*napi_poll)(struct napi_struct *napi, int budget);
6236 void *have_poll_lock = NULL;
6237 struct napi_struct *napi;
6239 WARN_ON_ONCE(!rcu_read_lock_held());
6244 napi = napi_by_id(napi_id);
6248 if (!IS_ENABLED(CONFIG_PREEMPT_RT))
6255 unsigned long val = READ_ONCE(napi->state);
6257 /* If multiple threads are competing for this napi,
6258 * we avoid dirtying napi->state as much as we can.
6260 if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED |
6261 NAPIF_STATE_IN_BUSY_POLL)) {
6262 if (flags & NAPI_F_PREFER_BUSY_POLL)
6263 set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state);
6266 if (cmpxchg(&napi->state, val,
6267 val | NAPIF_STATE_IN_BUSY_POLL |
6268 NAPIF_STATE_SCHED) != val) {
6269 if (flags & NAPI_F_PREFER_BUSY_POLL)
6270 set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state);
6273 have_poll_lock = netpoll_poll_lock(napi);
6274 napi_poll = napi->poll;
6276 work = napi_poll(napi, budget);
6277 trace_napi_poll(napi, work, budget);
6278 gro_normal_list(napi);
6281 __NET_ADD_STATS(dev_net(napi->dev),
6282 LINUX_MIB_BUSYPOLLRXPACKETS, work);
6285 if (!loop_end || loop_end(loop_end_arg, start_time))
6288 if (unlikely(need_resched())) {
6289 if (flags & NAPI_F_END_ON_RESCHED)
6292 busy_poll_stop(napi, have_poll_lock, flags, budget);
6293 if (!IS_ENABLED(CONFIG_PREEMPT_RT))
6298 if (loop_end(loop_end_arg, start_time))
6305 busy_poll_stop(napi, have_poll_lock, flags, budget);
6306 if (!IS_ENABLED(CONFIG_PREEMPT_RT))
6310 void napi_busy_loop_rcu(unsigned int napi_id,
6311 bool (*loop_end)(void *, unsigned long),
6312 void *loop_end_arg, bool prefer_busy_poll, u16 budget)
6314 unsigned flags = NAPI_F_END_ON_RESCHED;
6316 if (prefer_busy_poll)
6317 flags |= NAPI_F_PREFER_BUSY_POLL;
6319 __napi_busy_loop(napi_id, loop_end, loop_end_arg, flags, budget);
6322 void napi_busy_loop(unsigned int napi_id,
6323 bool (*loop_end)(void *, unsigned long),
6324 void *loop_end_arg, bool prefer_busy_poll, u16 budget)
6326 unsigned flags = prefer_busy_poll ? NAPI_F_PREFER_BUSY_POLL : 0;
6329 __napi_busy_loop(napi_id, loop_end, loop_end_arg, flags, budget);
6332 EXPORT_SYMBOL(napi_busy_loop);
6334 #endif /* CONFIG_NET_RX_BUSY_POLL */
6336 static void napi_hash_add(struct napi_struct *napi)
6338 if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state))
6341 spin_lock(&napi_hash_lock);
6343 /* 0..NR_CPUS range is reserved for sender_cpu use */
6345 if (unlikely(++napi_gen_id < MIN_NAPI_ID))
6346 napi_gen_id = MIN_NAPI_ID;
6347 } while (napi_by_id(napi_gen_id));
6348 napi->napi_id = napi_gen_id;
6350 hlist_add_head_rcu(&napi->napi_hash_node,
6351 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
6353 spin_unlock(&napi_hash_lock);
6356 /* Warning : caller is responsible to make sure rcu grace period
6357 * is respected before freeing memory containing @napi
6359 static void napi_hash_del(struct napi_struct *napi)
6361 spin_lock(&napi_hash_lock);
6363 hlist_del_init_rcu(&napi->napi_hash_node);
6365 spin_unlock(&napi_hash_lock);
6368 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
6370 struct napi_struct *napi;
6372 napi = container_of(timer, struct napi_struct, timer);
6374 /* Note : we use a relaxed variant of napi_schedule_prep() not setting
6375 * NAPI_STATE_MISSED, since we do not react to a device IRQ.
6377 if (!napi_disable_pending(napi) &&
6378 !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) {
6379 clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state);
6380 __napi_schedule_irqoff(napi);
6383 return HRTIMER_NORESTART;
6386 static void init_gro_hash(struct napi_struct *napi)
6390 for (i = 0; i < GRO_HASH_BUCKETS; i++) {
6391 INIT_LIST_HEAD(&napi->gro_hash[i].list);
6392 napi->gro_hash[i].count = 0;
6394 napi->gro_bitmask = 0;
6397 int dev_set_threaded(struct net_device *dev, bool threaded)
6399 struct napi_struct *napi;
6402 if (dev->threaded == threaded)
6406 list_for_each_entry(napi, &dev->napi_list, dev_list) {
6407 if (!napi->thread) {
6408 err = napi_kthread_create(napi);
6417 dev->threaded = threaded;
6419 /* Make sure kthread is created before THREADED bit
6422 smp_mb__before_atomic();
6424 /* Setting/unsetting threaded mode on a napi might not immediately
6425 * take effect, if the current napi instance is actively being
6426 * polled. In this case, the switch between threaded mode and
6427 * softirq mode will happen in the next round of napi_schedule().
6428 * This should not cause hiccups/stalls to the live traffic.
6430 list_for_each_entry(napi, &dev->napi_list, dev_list)
6431 assign_bit(NAPI_STATE_THREADED, &napi->state, threaded);
6435 EXPORT_SYMBOL(dev_set_threaded);
6438 * netif_queue_set_napi - Associate queue with the napi
6439 * @dev: device to which NAPI and queue belong
6440 * @queue_index: Index of queue
6441 * @type: queue type as RX or TX
6442 * @napi: NAPI context, pass NULL to clear previously set NAPI
6444 * Set queue with its corresponding napi context. This should be done after
6445 * registering the NAPI handler for the queue-vector and the queues have been
6446 * mapped to the corresponding interrupt vector.
6448 void netif_queue_set_napi(struct net_device *dev, unsigned int queue_index,
6449 enum netdev_queue_type type, struct napi_struct *napi)
6451 struct netdev_rx_queue *rxq;
6452 struct netdev_queue *txq;
6454 if (WARN_ON_ONCE(napi && !napi->dev))
6456 if (dev->reg_state >= NETREG_REGISTERED)
6460 case NETDEV_QUEUE_TYPE_RX:
6461 rxq = __netif_get_rx_queue(dev, queue_index);
6464 case NETDEV_QUEUE_TYPE_TX:
6465 txq = netdev_get_tx_queue(dev, queue_index);
6472 EXPORT_SYMBOL(netif_queue_set_napi);
6474 void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
6475 int (*poll)(struct napi_struct *, int), int weight)
6477 if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state)))
6480 INIT_LIST_HEAD(&napi->poll_list);
6481 INIT_HLIST_NODE(&napi->napi_hash_node);
6482 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
6483 napi->timer.function = napi_watchdog;
6484 init_gro_hash(napi);
6486 INIT_LIST_HEAD(&napi->rx_list);
6489 if (weight > NAPI_POLL_WEIGHT)
6490 netdev_err_once(dev, "%s() called with weight %d\n", __func__,
6492 napi->weight = weight;
6494 #ifdef CONFIG_NETPOLL
6495 napi->poll_owner = -1;
6497 napi->list_owner = -1;
6498 set_bit(NAPI_STATE_SCHED, &napi->state);
6499 set_bit(NAPI_STATE_NPSVC, &napi->state);
6500 list_add_rcu(&napi->dev_list, &dev->napi_list);
6501 napi_hash_add(napi);
6502 napi_get_frags_check(napi);
6503 /* Create kthread for this napi if dev->threaded is set.
6504 * Clear dev->threaded if kthread creation failed so that
6505 * threaded mode will not be enabled in napi_enable().
6507 if (dev->threaded && napi_kthread_create(napi))
6509 netif_napi_set_irq(napi, -1);
6511 EXPORT_SYMBOL(netif_napi_add_weight);
6513 void napi_disable(struct napi_struct *n)
6515 unsigned long val, new;
6518 set_bit(NAPI_STATE_DISABLE, &n->state);
6520 val = READ_ONCE(n->state);
6522 while (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) {
6523 usleep_range(20, 200);
6524 val = READ_ONCE(n->state);
6527 new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC;
6528 new &= ~(NAPIF_STATE_THREADED | NAPIF_STATE_PREFER_BUSY_POLL);
6529 } while (!try_cmpxchg(&n->state, &val, new));
6531 hrtimer_cancel(&n->timer);
6533 clear_bit(NAPI_STATE_DISABLE, &n->state);
6535 EXPORT_SYMBOL(napi_disable);
6538 * napi_enable - enable NAPI scheduling
6541 * Resume NAPI from being scheduled on this context.
6542 * Must be paired with napi_disable.
6544 void napi_enable(struct napi_struct *n)
6546 unsigned long new, val = READ_ONCE(n->state);
6549 BUG_ON(!test_bit(NAPI_STATE_SCHED, &val));
6551 new = val & ~(NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC);
6552 if (n->dev->threaded && n->thread)
6553 new |= NAPIF_STATE_THREADED;
6554 } while (!try_cmpxchg(&n->state, &val, new));
6556 EXPORT_SYMBOL(napi_enable);
6558 static void flush_gro_hash(struct napi_struct *napi)
6562 for (i = 0; i < GRO_HASH_BUCKETS; i++) {
6563 struct sk_buff *skb, *n;
6565 list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list)
6567 napi->gro_hash[i].count = 0;
6571 /* Must be called in process context */
6572 void __netif_napi_del(struct napi_struct *napi)
6574 if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state))
6577 napi_hash_del(napi);
6578 list_del_rcu(&napi->dev_list);
6579 napi_free_frags(napi);
6581 flush_gro_hash(napi);
6582 napi->gro_bitmask = 0;
6585 kthread_stop(napi->thread);
6586 napi->thread = NULL;
6589 EXPORT_SYMBOL(__netif_napi_del);
6591 static int __napi_poll(struct napi_struct *n, bool *repoll)
6597 /* This NAPI_STATE_SCHED test is for avoiding a race
6598 * with netpoll's poll_napi(). Only the entity which
6599 * obtains the lock and sees NAPI_STATE_SCHED set will
6600 * actually make the ->poll() call. Therefore we avoid
6601 * accidentally calling ->poll() when NAPI is not scheduled.
6604 if (napi_is_scheduled(n)) {
6605 work = n->poll(n, weight);
6606 trace_napi_poll(n, work, weight);
6608 xdp_do_check_flushed(n);
6611 if (unlikely(work > weight))
6612 netdev_err_once(n->dev, "NAPI poll function %pS returned %d, exceeding its budget of %d.\n",
6613 n->poll, work, weight);
6615 if (likely(work < weight))
6618 /* Drivers must not modify the NAPI state if they
6619 * consume the entire weight. In such cases this code
6620 * still "owns" the NAPI instance and therefore can
6621 * move the instance around on the list at-will.
6623 if (unlikely(napi_disable_pending(n))) {
6628 /* The NAPI context has more processing work, but busy-polling
6629 * is preferred. Exit early.
6631 if (napi_prefer_busy_poll(n)) {
6632 if (napi_complete_done(n, work)) {
6633 /* If timeout is not set, we need to make sure
6634 * that the NAPI is re-scheduled.
6641 if (n->gro_bitmask) {
6642 /* flush too old packets
6643 * If HZ < 1000, flush all packets.
6645 napi_gro_flush(n, HZ >= 1000);
6650 /* Some drivers may have called napi_schedule
6651 * prior to exhausting their budget.
6653 if (unlikely(!list_empty(&n->poll_list))) {
6654 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
6655 n->dev ? n->dev->name : "backlog");
6664 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
6666 bool do_repoll = false;
6670 list_del_init(&n->poll_list);
6672 have = netpoll_poll_lock(n);
6674 work = __napi_poll(n, &do_repoll);
6677 list_add_tail(&n->poll_list, repoll);
6679 netpoll_poll_unlock(have);
6684 static int napi_thread_wait(struct napi_struct *napi)
6688 set_current_state(TASK_INTERRUPTIBLE);
6690 while (!kthread_should_stop()) {
6691 /* Testing SCHED_THREADED bit here to make sure the current
6692 * kthread owns this napi and could poll on this napi.
6693 * Testing SCHED bit is not enough because SCHED bit might be
6694 * set by some other busy poll thread or by napi_disable().
6696 if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state) || woken) {
6697 WARN_ON(!list_empty(&napi->poll_list));
6698 __set_current_state(TASK_RUNNING);
6703 /* woken being true indicates this thread owns this napi. */
6705 set_current_state(TASK_INTERRUPTIBLE);
6707 __set_current_state(TASK_RUNNING);
6712 static void skb_defer_free_flush(struct softnet_data *sd)
6714 struct sk_buff *skb, *next;
6716 /* Paired with WRITE_ONCE() in skb_attempt_defer_free() */
6717 if (!READ_ONCE(sd->defer_list))
6720 spin_lock(&sd->defer_lock);
6721 skb = sd->defer_list;
6722 sd->defer_list = NULL;
6723 sd->defer_count = 0;
6724 spin_unlock(&sd->defer_lock);
6726 while (skb != NULL) {
6728 napi_consume_skb(skb, 1);
6733 static int napi_threaded_poll(void *data)
6735 struct napi_struct *napi = data;
6736 struct softnet_data *sd;
6739 while (!napi_thread_wait(napi)) {
6741 bool repoll = false;
6744 sd = this_cpu_ptr(&softnet_data);
6745 sd->in_napi_threaded_poll = true;
6747 have = netpoll_poll_lock(napi);
6748 __napi_poll(napi, &repoll);
6749 netpoll_poll_unlock(have);
6751 sd->in_napi_threaded_poll = false;
6754 if (sd_has_rps_ipi_waiting(sd)) {
6755 local_irq_disable();
6756 net_rps_action_and_irq_enable(sd);
6758 skb_defer_free_flush(sd);
6770 static __latent_entropy void net_rx_action(struct softirq_action *h)
6772 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
6773 unsigned long time_limit = jiffies +
6774 usecs_to_jiffies(READ_ONCE(netdev_budget_usecs));
6775 int budget = READ_ONCE(netdev_budget);
6780 sd->in_net_rx_action = true;
6781 local_irq_disable();
6782 list_splice_init(&sd->poll_list, &list);
6786 struct napi_struct *n;
6788 skb_defer_free_flush(sd);
6790 if (list_empty(&list)) {
6791 if (list_empty(&repoll)) {
6792 sd->in_net_rx_action = false;
6794 /* We need to check if ____napi_schedule()
6795 * had refilled poll_list while
6796 * sd->in_net_rx_action was true.
6798 if (!list_empty(&sd->poll_list))
6800 if (!sd_has_rps_ipi_waiting(sd))
6806 n = list_first_entry(&list, struct napi_struct, poll_list);
6807 budget -= napi_poll(n, &repoll);
6809 /* If softirq window is exhausted then punt.
6810 * Allow this to run for 2 jiffies since which will allow
6811 * an average latency of 1.5/HZ.
6813 if (unlikely(budget <= 0 ||
6814 time_after_eq(jiffies, time_limit))) {
6820 local_irq_disable();
6822 list_splice_tail_init(&sd->poll_list, &list);
6823 list_splice_tail(&repoll, &list);
6824 list_splice(&list, &sd->poll_list);
6825 if (!list_empty(&sd->poll_list))
6826 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
6828 sd->in_net_rx_action = false;
6830 net_rps_action_and_irq_enable(sd);
6834 struct netdev_adjacent {
6835 struct net_device *dev;
6836 netdevice_tracker dev_tracker;
6838 /* upper master flag, there can only be one master device per list */
6841 /* lookup ignore flag */
6844 /* counter for the number of times this device was added to us */
6847 /* private field for the users */
6850 struct list_head list;
6851 struct rcu_head rcu;
6854 static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
6855 struct list_head *adj_list)
6857 struct netdev_adjacent *adj;
6859 list_for_each_entry(adj, adj_list, list) {
6860 if (adj->dev == adj_dev)
6866 static int ____netdev_has_upper_dev(struct net_device *upper_dev,
6867 struct netdev_nested_priv *priv)
6869 struct net_device *dev = (struct net_device *)priv->data;
6871 return upper_dev == dev;
6875 * netdev_has_upper_dev - Check if device is linked to an upper device
6877 * @upper_dev: upper device to check
6879 * Find out if a device is linked to specified upper device and return true
6880 * in case it is. Note that this checks only immediate upper device,
6881 * not through a complete stack of devices. The caller must hold the RTNL lock.
6883 bool netdev_has_upper_dev(struct net_device *dev,
6884 struct net_device *upper_dev)
6886 struct netdev_nested_priv priv = {
6887 .data = (void *)upper_dev,
6892 return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev,
6895 EXPORT_SYMBOL(netdev_has_upper_dev);
6898 * netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device
6900 * @upper_dev: upper device to check
6902 * Find out if a device is linked to specified upper device and return true
6903 * in case it is. Note that this checks the entire upper device chain.
6904 * The caller must hold rcu lock.
6907 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
6908 struct net_device *upper_dev)
6910 struct netdev_nested_priv priv = {
6911 .data = (void *)upper_dev,
6914 return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev,
6917 EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);
6920 * netdev_has_any_upper_dev - Check if device is linked to some device
6923 * Find out if a device is linked to an upper device and return true in case
6924 * it is. The caller must hold the RTNL lock.
6926 bool netdev_has_any_upper_dev(struct net_device *dev)
6930 return !list_empty(&dev->adj_list.upper);
6932 EXPORT_SYMBOL(netdev_has_any_upper_dev);
6935 * netdev_master_upper_dev_get - Get master upper device
6938 * Find a master upper device and return pointer to it or NULL in case
6939 * it's not there. The caller must hold the RTNL lock.
6941 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
6943 struct netdev_adjacent *upper;
6947 if (list_empty(&dev->adj_list.upper))
6950 upper = list_first_entry(&dev->adj_list.upper,
6951 struct netdev_adjacent, list);
6952 if (likely(upper->master))
6956 EXPORT_SYMBOL(netdev_master_upper_dev_get);
6958 static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev)
6960 struct netdev_adjacent *upper;
6964 if (list_empty(&dev->adj_list.upper))
6967 upper = list_first_entry(&dev->adj_list.upper,
6968 struct netdev_adjacent, list);
6969 if (likely(upper->master) && !upper->ignore)
6975 * netdev_has_any_lower_dev - Check if device is linked to some device
6978 * Find out if a device is linked to a lower device and return true in case
6979 * it is. The caller must hold the RTNL lock.
6981 static bool netdev_has_any_lower_dev(struct net_device *dev)
6985 return !list_empty(&dev->adj_list.lower);
6988 void *netdev_adjacent_get_private(struct list_head *adj_list)
6990 struct netdev_adjacent *adj;
6992 adj = list_entry(adj_list, struct netdev_adjacent, list);
6994 return adj->private;
6996 EXPORT_SYMBOL(netdev_adjacent_get_private);
6999 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
7001 * @iter: list_head ** of the current position
7003 * Gets the next device from the dev's upper list, starting from iter
7004 * position. The caller must hold RCU read lock.
7006 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
7007 struct list_head **iter)
7009 struct netdev_adjacent *upper;
7011 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
7013 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7015 if (&upper->list == &dev->adj_list.upper)
7018 *iter = &upper->list;
7022 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
7024 static struct net_device *__netdev_next_upper_dev(struct net_device *dev,
7025 struct list_head **iter,
7028 struct netdev_adjacent *upper;
7030 upper = list_entry((*iter)->next, struct netdev_adjacent, list);
7032 if (&upper->list == &dev->adj_list.upper)
7035 *iter = &upper->list;
7036 *ignore = upper->ignore;
7041 static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev,
7042 struct list_head **iter)
7044 struct netdev_adjacent *upper;
7046 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
7048 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7050 if (&upper->list == &dev->adj_list.upper)
7053 *iter = &upper->list;
7058 static int __netdev_walk_all_upper_dev(struct net_device *dev,
7059 int (*fn)(struct net_device *dev,
7060 struct netdev_nested_priv *priv),
7061 struct netdev_nested_priv *priv)
7063 struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7064 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7069 iter = &dev->adj_list.upper;
7073 ret = fn(now, priv);
7080 udev = __netdev_next_upper_dev(now, &iter, &ignore);
7087 niter = &udev->adj_list.upper;
7088 dev_stack[cur] = now;
7089 iter_stack[cur++] = iter;
7096 next = dev_stack[--cur];
7097 niter = iter_stack[cur];
7107 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
7108 int (*fn)(struct net_device *dev,
7109 struct netdev_nested_priv *priv),
7110 struct netdev_nested_priv *priv)
7112 struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7113 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7117 iter = &dev->adj_list.upper;
7121 ret = fn(now, priv);
7128 udev = netdev_next_upper_dev_rcu(now, &iter);
7133 niter = &udev->adj_list.upper;
7134 dev_stack[cur] = now;
7135 iter_stack[cur++] = iter;
7142 next = dev_stack[--cur];
7143 niter = iter_stack[cur];
7152 EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu);
7154 static bool __netdev_has_upper_dev(struct net_device *dev,
7155 struct net_device *upper_dev)
7157 struct netdev_nested_priv priv = {
7159 .data = (void *)upper_dev,
7164 return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev,
7169 * netdev_lower_get_next_private - Get the next ->private from the
7170 * lower neighbour list
7172 * @iter: list_head ** of the current position
7174 * Gets the next netdev_adjacent->private from the dev's lower neighbour
7175 * list, starting from iter position. The caller must hold either hold the
7176 * RTNL lock or its own locking that guarantees that the neighbour lower
7177 * list will remain unchanged.
7179 void *netdev_lower_get_next_private(struct net_device *dev,
7180 struct list_head **iter)
7182 struct netdev_adjacent *lower;
7184 lower = list_entry(*iter, struct netdev_adjacent, list);
7186 if (&lower->list == &dev->adj_list.lower)
7189 *iter = lower->list.next;
7191 return lower->private;
7193 EXPORT_SYMBOL(netdev_lower_get_next_private);
7196 * netdev_lower_get_next_private_rcu - Get the next ->private from the
7197 * lower neighbour list, RCU
7200 * @iter: list_head ** of the current position
7202 * Gets the next netdev_adjacent->private from the dev's lower neighbour
7203 * list, starting from iter position. The caller must hold RCU read lock.
7205 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
7206 struct list_head **iter)
7208 struct netdev_adjacent *lower;
7210 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
7212 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7214 if (&lower->list == &dev->adj_list.lower)
7217 *iter = &lower->list;
7219 return lower->private;
7221 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
7224 * netdev_lower_get_next - Get the next device from the lower neighbour
7227 * @iter: list_head ** of the current position
7229 * Gets the next netdev_adjacent from the dev's lower neighbour
7230 * list, starting from iter position. The caller must hold RTNL lock or
7231 * its own locking that guarantees that the neighbour lower
7232 * list will remain unchanged.
7234 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
7236 struct netdev_adjacent *lower;
7238 lower = list_entry(*iter, struct netdev_adjacent, list);
7240 if (&lower->list == &dev->adj_list.lower)
7243 *iter = lower->list.next;
7247 EXPORT_SYMBOL(netdev_lower_get_next);
7249 static struct net_device *netdev_next_lower_dev(struct net_device *dev,
7250 struct list_head **iter)
7252 struct netdev_adjacent *lower;
7254 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
7256 if (&lower->list == &dev->adj_list.lower)
7259 *iter = &lower->list;
7264 static struct net_device *__netdev_next_lower_dev(struct net_device *dev,
7265 struct list_head **iter,
7268 struct netdev_adjacent *lower;
7270 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
7272 if (&lower->list == &dev->adj_list.lower)
7275 *iter = &lower->list;
7276 *ignore = lower->ignore;
7281 int netdev_walk_all_lower_dev(struct net_device *dev,
7282 int (*fn)(struct net_device *dev,
7283 struct netdev_nested_priv *priv),
7284 struct netdev_nested_priv *priv)
7286 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7287 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7291 iter = &dev->adj_list.lower;
7295 ret = fn(now, priv);
7302 ldev = netdev_next_lower_dev(now, &iter);
7307 niter = &ldev->adj_list.lower;
7308 dev_stack[cur] = now;
7309 iter_stack[cur++] = iter;
7316 next = dev_stack[--cur];
7317 niter = iter_stack[cur];
7326 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev);
7328 static int __netdev_walk_all_lower_dev(struct net_device *dev,
7329 int (*fn)(struct net_device *dev,
7330 struct netdev_nested_priv *priv),
7331 struct netdev_nested_priv *priv)
7333 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7334 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7339 iter = &dev->adj_list.lower;
7343 ret = fn(now, priv);
7350 ldev = __netdev_next_lower_dev(now, &iter, &ignore);
7357 niter = &ldev->adj_list.lower;
7358 dev_stack[cur] = now;
7359 iter_stack[cur++] = iter;
7366 next = dev_stack[--cur];
7367 niter = iter_stack[cur];
7377 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev,
7378 struct list_head **iter)
7380 struct netdev_adjacent *lower;
7382 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7383 if (&lower->list == &dev->adj_list.lower)
7386 *iter = &lower->list;
7390 EXPORT_SYMBOL(netdev_next_lower_dev_rcu);
7392 static u8 __netdev_upper_depth(struct net_device *dev)
7394 struct net_device *udev;
7395 struct list_head *iter;
7399 for (iter = &dev->adj_list.upper,
7400 udev = __netdev_next_upper_dev(dev, &iter, &ignore);
7402 udev = __netdev_next_upper_dev(dev, &iter, &ignore)) {
7405 if (max_depth < udev->upper_level)
7406 max_depth = udev->upper_level;
7412 static u8 __netdev_lower_depth(struct net_device *dev)
7414 struct net_device *ldev;
7415 struct list_head *iter;
7419 for (iter = &dev->adj_list.lower,
7420 ldev = __netdev_next_lower_dev(dev, &iter, &ignore);
7422 ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) {
7425 if (max_depth < ldev->lower_level)
7426 max_depth = ldev->lower_level;
7432 static int __netdev_update_upper_level(struct net_device *dev,
7433 struct netdev_nested_priv *__unused)
7435 dev->upper_level = __netdev_upper_depth(dev) + 1;
7439 #ifdef CONFIG_LOCKDEP
7440 static LIST_HEAD(net_unlink_list);
7442 static void net_unlink_todo(struct net_device *dev)
7444 if (list_empty(&dev->unlink_list))
7445 list_add_tail(&dev->unlink_list, &net_unlink_list);
7449 static int __netdev_update_lower_level(struct net_device *dev,
7450 struct netdev_nested_priv *priv)
7452 dev->lower_level = __netdev_lower_depth(dev) + 1;
7454 #ifdef CONFIG_LOCKDEP
7458 if (priv->flags & NESTED_SYNC_IMM)
7459 dev->nested_level = dev->lower_level - 1;
7460 if (priv->flags & NESTED_SYNC_TODO)
7461 net_unlink_todo(dev);
7466 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
7467 int (*fn)(struct net_device *dev,
7468 struct netdev_nested_priv *priv),
7469 struct netdev_nested_priv *priv)
7471 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7472 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7476 iter = &dev->adj_list.lower;
7480 ret = fn(now, priv);
7487 ldev = netdev_next_lower_dev_rcu(now, &iter);
7492 niter = &ldev->adj_list.lower;
7493 dev_stack[cur] = now;
7494 iter_stack[cur++] = iter;
7501 next = dev_stack[--cur];
7502 niter = iter_stack[cur];
7511 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu);
7514 * netdev_lower_get_first_private_rcu - Get the first ->private from the
7515 * lower neighbour list, RCU
7519 * Gets the first netdev_adjacent->private from the dev's lower neighbour
7520 * list. The caller must hold RCU read lock.
7522 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
7524 struct netdev_adjacent *lower;
7526 lower = list_first_or_null_rcu(&dev->adj_list.lower,
7527 struct netdev_adjacent, list);
7529 return lower->private;
7532 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
7535 * netdev_master_upper_dev_get_rcu - Get master upper device
7538 * Find a master upper device and return pointer to it or NULL in case
7539 * it's not there. The caller must hold the RCU read lock.
7541 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
7543 struct netdev_adjacent *upper;
7545 upper = list_first_or_null_rcu(&dev->adj_list.upper,
7546 struct netdev_adjacent, list);
7547 if (upper && likely(upper->master))
7551 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
7553 static int netdev_adjacent_sysfs_add(struct net_device *dev,
7554 struct net_device *adj_dev,
7555 struct list_head *dev_list)
7557 char linkname[IFNAMSIZ+7];
7559 sprintf(linkname, dev_list == &dev->adj_list.upper ?
7560 "upper_%s" : "lower_%s", adj_dev->name);
7561 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
7564 static void netdev_adjacent_sysfs_del(struct net_device *dev,
7566 struct list_head *dev_list)
7568 char linkname[IFNAMSIZ+7];
7570 sprintf(linkname, dev_list == &dev->adj_list.upper ?
7571 "upper_%s" : "lower_%s", name);
7572 sysfs_remove_link(&(dev->dev.kobj), linkname);
7575 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
7576 struct net_device *adj_dev,
7577 struct list_head *dev_list)
7579 return (dev_list == &dev->adj_list.upper ||
7580 dev_list == &dev->adj_list.lower) &&
7581 net_eq(dev_net(dev), dev_net(adj_dev));
7584 static int __netdev_adjacent_dev_insert(struct net_device *dev,
7585 struct net_device *adj_dev,
7586 struct list_head *dev_list,
7587 void *private, bool master)
7589 struct netdev_adjacent *adj;
7592 adj = __netdev_find_adj(adj_dev, dev_list);
7596 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n",
7597 dev->name, adj_dev->name, adj->ref_nr);
7602 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
7607 adj->master = master;
7609 adj->private = private;
7610 adj->ignore = false;
7611 netdev_hold(adj_dev, &adj->dev_tracker, GFP_KERNEL);
7613 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n",
7614 dev->name, adj_dev->name, adj->ref_nr, adj_dev->name);
7616 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
7617 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
7622 /* Ensure that master link is always the first item in list. */
7624 ret = sysfs_create_link(&(dev->dev.kobj),
7625 &(adj_dev->dev.kobj), "master");
7627 goto remove_symlinks;
7629 list_add_rcu(&adj->list, dev_list);
7631 list_add_tail_rcu(&adj->list, dev_list);
7637 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
7638 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
7640 netdev_put(adj_dev, &adj->dev_tracker);
7646 static void __netdev_adjacent_dev_remove(struct net_device *dev,
7647 struct net_device *adj_dev,
7649 struct list_head *dev_list)
7651 struct netdev_adjacent *adj;
7653 pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n",
7654 dev->name, adj_dev->name, ref_nr);
7656 adj = __netdev_find_adj(adj_dev, dev_list);
7659 pr_err("Adjacency does not exist for device %s from %s\n",
7660 dev->name, adj_dev->name);
7665 if (adj->ref_nr > ref_nr) {
7666 pr_debug("adjacency: %s to %s ref_nr - %d = %d\n",
7667 dev->name, adj_dev->name, ref_nr,
7668 adj->ref_nr - ref_nr);
7669 adj->ref_nr -= ref_nr;
7674 sysfs_remove_link(&(dev->dev.kobj), "master");
7676 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
7677 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
7679 list_del_rcu(&adj->list);
7680 pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n",
7681 adj_dev->name, dev->name, adj_dev->name);
7682 netdev_put(adj_dev, &adj->dev_tracker);
7683 kfree_rcu(adj, rcu);
7686 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
7687 struct net_device *upper_dev,
7688 struct list_head *up_list,
7689 struct list_head *down_list,
7690 void *private, bool master)
7694 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list,
7699 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list,
7702 __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list);
7709 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
7710 struct net_device *upper_dev,
7712 struct list_head *up_list,
7713 struct list_head *down_list)
7715 __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list);
7716 __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list);
7719 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
7720 struct net_device *upper_dev,
7721 void *private, bool master)
7723 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
7724 &dev->adj_list.upper,
7725 &upper_dev->adj_list.lower,
7729 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
7730 struct net_device *upper_dev)
7732 __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1,
7733 &dev->adj_list.upper,
7734 &upper_dev->adj_list.lower);
7737 static int __netdev_upper_dev_link(struct net_device *dev,
7738 struct net_device *upper_dev, bool master,
7739 void *upper_priv, void *upper_info,
7740 struct netdev_nested_priv *priv,
7741 struct netlink_ext_ack *extack)
7743 struct netdev_notifier_changeupper_info changeupper_info = {
7748 .upper_dev = upper_dev,
7751 .upper_info = upper_info,
7753 struct net_device *master_dev;
7758 if (dev == upper_dev)
7761 /* To prevent loops, check if dev is not upper device to upper_dev. */
7762 if (__netdev_has_upper_dev(upper_dev, dev))
7765 if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV)
7769 if (__netdev_has_upper_dev(dev, upper_dev))
7772 master_dev = __netdev_master_upper_dev_get(dev);
7774 return master_dev == upper_dev ? -EEXIST : -EBUSY;
7777 ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER,
7778 &changeupper_info.info);
7779 ret = notifier_to_errno(ret);
7783 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv,
7788 ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER,
7789 &changeupper_info.info);
7790 ret = notifier_to_errno(ret);
7794 __netdev_update_upper_level(dev, NULL);
7795 __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL);
7797 __netdev_update_lower_level(upper_dev, priv);
7798 __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level,
7804 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
7810 * netdev_upper_dev_link - Add a link to the upper device
7812 * @upper_dev: new upper device
7813 * @extack: netlink extended ack
7815 * Adds a link to device which is upper to this one. The caller must hold
7816 * the RTNL lock. On a failure a negative errno code is returned.
7817 * On success the reference counts are adjusted and the function
7820 int netdev_upper_dev_link(struct net_device *dev,
7821 struct net_device *upper_dev,
7822 struct netlink_ext_ack *extack)
7824 struct netdev_nested_priv priv = {
7825 .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO,
7829 return __netdev_upper_dev_link(dev, upper_dev, false,
7830 NULL, NULL, &priv, extack);
7832 EXPORT_SYMBOL(netdev_upper_dev_link);
7835 * netdev_master_upper_dev_link - Add a master link to the upper device
7837 * @upper_dev: new upper device
7838 * @upper_priv: upper device private
7839 * @upper_info: upper info to be passed down via notifier
7840 * @extack: netlink extended ack
7842 * Adds a link to device which is upper to this one. In this case, only
7843 * one master upper device can be linked, although other non-master devices
7844 * might be linked as well. The caller must hold the RTNL lock.
7845 * On a failure a negative errno code is returned. On success the reference
7846 * counts are adjusted and the function returns zero.
7848 int netdev_master_upper_dev_link(struct net_device *dev,
7849 struct net_device *upper_dev,
7850 void *upper_priv, void *upper_info,
7851 struct netlink_ext_ack *extack)
7853 struct netdev_nested_priv priv = {
7854 .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO,
7858 return __netdev_upper_dev_link(dev, upper_dev, true,
7859 upper_priv, upper_info, &priv, extack);
7861 EXPORT_SYMBOL(netdev_master_upper_dev_link);
7863 static void __netdev_upper_dev_unlink(struct net_device *dev,
7864 struct net_device *upper_dev,
7865 struct netdev_nested_priv *priv)
7867 struct netdev_notifier_changeupper_info changeupper_info = {
7871 .upper_dev = upper_dev,
7877 changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
7879 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER,
7880 &changeupper_info.info);
7882 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
7884 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER,
7885 &changeupper_info.info);
7887 __netdev_update_upper_level(dev, NULL);
7888 __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL);
7890 __netdev_update_lower_level(upper_dev, priv);
7891 __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level,
7896 * netdev_upper_dev_unlink - Removes a link to upper device
7898 * @upper_dev: new upper device
7900 * Removes a link to device which is upper to this one. The caller must hold
7903 void netdev_upper_dev_unlink(struct net_device *dev,
7904 struct net_device *upper_dev)
7906 struct netdev_nested_priv priv = {
7907 .flags = NESTED_SYNC_TODO,
7911 __netdev_upper_dev_unlink(dev, upper_dev, &priv);
7913 EXPORT_SYMBOL(netdev_upper_dev_unlink);
7915 static void __netdev_adjacent_dev_set(struct net_device *upper_dev,
7916 struct net_device *lower_dev,
7919 struct netdev_adjacent *adj;
7921 adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower);
7925 adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper);
7930 static void netdev_adjacent_dev_disable(struct net_device *upper_dev,
7931 struct net_device *lower_dev)
7933 __netdev_adjacent_dev_set(upper_dev, lower_dev, true);
7936 static void netdev_adjacent_dev_enable(struct net_device *upper_dev,
7937 struct net_device *lower_dev)
7939 __netdev_adjacent_dev_set(upper_dev, lower_dev, false);
7942 int netdev_adjacent_change_prepare(struct net_device *old_dev,
7943 struct net_device *new_dev,
7944 struct net_device *dev,
7945 struct netlink_ext_ack *extack)
7947 struct netdev_nested_priv priv = {
7956 if (old_dev && new_dev != old_dev)
7957 netdev_adjacent_dev_disable(dev, old_dev);
7958 err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv,
7961 if (old_dev && new_dev != old_dev)
7962 netdev_adjacent_dev_enable(dev, old_dev);
7968 EXPORT_SYMBOL(netdev_adjacent_change_prepare);
7970 void netdev_adjacent_change_commit(struct net_device *old_dev,
7971 struct net_device *new_dev,
7972 struct net_device *dev)
7974 struct netdev_nested_priv priv = {
7975 .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO,
7979 if (!new_dev || !old_dev)
7982 if (new_dev == old_dev)
7985 netdev_adjacent_dev_enable(dev, old_dev);
7986 __netdev_upper_dev_unlink(old_dev, dev, &priv);
7988 EXPORT_SYMBOL(netdev_adjacent_change_commit);
7990 void netdev_adjacent_change_abort(struct net_device *old_dev,
7991 struct net_device *new_dev,
7992 struct net_device *dev)
7994 struct netdev_nested_priv priv = {
8002 if (old_dev && new_dev != old_dev)
8003 netdev_adjacent_dev_enable(dev, old_dev);
8005 __netdev_upper_dev_unlink(new_dev, dev, &priv);
8007 EXPORT_SYMBOL(netdev_adjacent_change_abort);
8010 * netdev_bonding_info_change - Dispatch event about slave change
8012 * @bonding_info: info to dispatch
8014 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
8015 * The caller must hold the RTNL lock.
8017 void netdev_bonding_info_change(struct net_device *dev,
8018 struct netdev_bonding_info *bonding_info)
8020 struct netdev_notifier_bonding_info info = {
8024 memcpy(&info.bonding_info, bonding_info,
8025 sizeof(struct netdev_bonding_info));
8026 call_netdevice_notifiers_info(NETDEV_BONDING_INFO,
8029 EXPORT_SYMBOL(netdev_bonding_info_change);
8031 static int netdev_offload_xstats_enable_l3(struct net_device *dev,
8032 struct netlink_ext_ack *extack)
8034 struct netdev_notifier_offload_xstats_info info = {
8036 .info.extack = extack,
8037 .type = NETDEV_OFFLOAD_XSTATS_TYPE_L3,
8042 dev->offload_xstats_l3 = kzalloc(sizeof(*dev->offload_xstats_l3),
8044 if (!dev->offload_xstats_l3)
8047 rc = call_netdevice_notifiers_info_robust(NETDEV_OFFLOAD_XSTATS_ENABLE,
8048 NETDEV_OFFLOAD_XSTATS_DISABLE,
8050 err = notifier_to_errno(rc);
8057 kfree(dev->offload_xstats_l3);
8058 dev->offload_xstats_l3 = NULL;
8062 int netdev_offload_xstats_enable(struct net_device *dev,
8063 enum netdev_offload_xstats_type type,
8064 struct netlink_ext_ack *extack)
8068 if (netdev_offload_xstats_enabled(dev, type))
8072 case NETDEV_OFFLOAD_XSTATS_TYPE_L3:
8073 return netdev_offload_xstats_enable_l3(dev, extack);
8079 EXPORT_SYMBOL(netdev_offload_xstats_enable);
8081 static void netdev_offload_xstats_disable_l3(struct net_device *dev)
8083 struct netdev_notifier_offload_xstats_info info = {
8085 .type = NETDEV_OFFLOAD_XSTATS_TYPE_L3,
8088 call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_DISABLE,
8090 kfree(dev->offload_xstats_l3);
8091 dev->offload_xstats_l3 = NULL;
8094 int netdev_offload_xstats_disable(struct net_device *dev,
8095 enum netdev_offload_xstats_type type)
8099 if (!netdev_offload_xstats_enabled(dev, type))
8103 case NETDEV_OFFLOAD_XSTATS_TYPE_L3:
8104 netdev_offload_xstats_disable_l3(dev);
8111 EXPORT_SYMBOL(netdev_offload_xstats_disable);
8113 static void netdev_offload_xstats_disable_all(struct net_device *dev)
8115 netdev_offload_xstats_disable(dev, NETDEV_OFFLOAD_XSTATS_TYPE_L3);
8118 static struct rtnl_hw_stats64 *
8119 netdev_offload_xstats_get_ptr(const struct net_device *dev,
8120 enum netdev_offload_xstats_type type)
8123 case NETDEV_OFFLOAD_XSTATS_TYPE_L3:
8124 return dev->offload_xstats_l3;
8131 bool netdev_offload_xstats_enabled(const struct net_device *dev,
8132 enum netdev_offload_xstats_type type)
8136 return netdev_offload_xstats_get_ptr(dev, type);
8138 EXPORT_SYMBOL(netdev_offload_xstats_enabled);
8140 struct netdev_notifier_offload_xstats_ru {
8144 struct netdev_notifier_offload_xstats_rd {
8145 struct rtnl_hw_stats64 stats;
8149 static void netdev_hw_stats64_add(struct rtnl_hw_stats64 *dest,
8150 const struct rtnl_hw_stats64 *src)
8152 dest->rx_packets += src->rx_packets;
8153 dest->tx_packets += src->tx_packets;
8154 dest->rx_bytes += src->rx_bytes;
8155 dest->tx_bytes += src->tx_bytes;
8156 dest->rx_errors += src->rx_errors;
8157 dest->tx_errors += src->tx_errors;
8158 dest->rx_dropped += src->rx_dropped;
8159 dest->tx_dropped += src->tx_dropped;
8160 dest->multicast += src->multicast;
8163 static int netdev_offload_xstats_get_used(struct net_device *dev,
8164 enum netdev_offload_xstats_type type,
8166 struct netlink_ext_ack *extack)
8168 struct netdev_notifier_offload_xstats_ru report_used = {};
8169 struct netdev_notifier_offload_xstats_info info = {
8171 .info.extack = extack,
8173 .report_used = &report_used,
8177 WARN_ON(!netdev_offload_xstats_enabled(dev, type));
8178 rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_USED,
8180 *p_used = report_used.used;
8181 return notifier_to_errno(rc);
8184 static int netdev_offload_xstats_get_stats(struct net_device *dev,
8185 enum netdev_offload_xstats_type type,
8186 struct rtnl_hw_stats64 *p_stats,
8188 struct netlink_ext_ack *extack)
8190 struct netdev_notifier_offload_xstats_rd report_delta = {};
8191 struct netdev_notifier_offload_xstats_info info = {
8193 .info.extack = extack,
8195 .report_delta = &report_delta,
8197 struct rtnl_hw_stats64 *stats;
8200 stats = netdev_offload_xstats_get_ptr(dev, type);
8201 if (WARN_ON(!stats))
8204 rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_DELTA,
8207 /* Cache whatever we got, even if there was an error, otherwise the
8208 * successful stats retrievals would get lost.
8210 netdev_hw_stats64_add(stats, &report_delta.stats);
8214 *p_used = report_delta.used;
8216 return notifier_to_errno(rc);
8219 int netdev_offload_xstats_get(struct net_device *dev,
8220 enum netdev_offload_xstats_type type,
8221 struct rtnl_hw_stats64 *p_stats, bool *p_used,
8222 struct netlink_ext_ack *extack)
8227 return netdev_offload_xstats_get_stats(dev, type, p_stats,
8230 return netdev_offload_xstats_get_used(dev, type, p_used,
8233 EXPORT_SYMBOL(netdev_offload_xstats_get);
8236 netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *report_delta,
8237 const struct rtnl_hw_stats64 *stats)
8239 report_delta->used = true;
8240 netdev_hw_stats64_add(&report_delta->stats, stats);
8242 EXPORT_SYMBOL(netdev_offload_xstats_report_delta);
8245 netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *report_used)
8247 report_used->used = true;
8249 EXPORT_SYMBOL(netdev_offload_xstats_report_used);
8251 void netdev_offload_xstats_push_delta(struct net_device *dev,
8252 enum netdev_offload_xstats_type type,
8253 const struct rtnl_hw_stats64 *p_stats)
8255 struct rtnl_hw_stats64 *stats;
8259 stats = netdev_offload_xstats_get_ptr(dev, type);
8260 if (WARN_ON(!stats))
8263 netdev_hw_stats64_add(stats, p_stats);
8265 EXPORT_SYMBOL(netdev_offload_xstats_push_delta);
8268 * netdev_get_xmit_slave - Get the xmit slave of master device
8271 * @all_slaves: assume all the slaves are active
8273 * The reference counters are not incremented so the caller must be
8274 * careful with locks. The caller must hold RCU lock.
8275 * %NULL is returned if no slave is found.
8278 struct net_device *netdev_get_xmit_slave(struct net_device *dev,
8279 struct sk_buff *skb,
8282 const struct net_device_ops *ops = dev->netdev_ops;
8284 if (!ops->ndo_get_xmit_slave)
8286 return ops->ndo_get_xmit_slave(dev, skb, all_slaves);
8288 EXPORT_SYMBOL(netdev_get_xmit_slave);
8290 static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev,
8293 const struct net_device_ops *ops = dev->netdev_ops;
8295 if (!ops->ndo_sk_get_lower_dev)
8297 return ops->ndo_sk_get_lower_dev(dev, sk);
8301 * netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket
8305 * %NULL is returned if no lower device is found.
8308 struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,
8311 struct net_device *lower;
8313 lower = netdev_sk_get_lower_dev(dev, sk);
8316 lower = netdev_sk_get_lower_dev(dev, sk);
8321 EXPORT_SYMBOL(netdev_sk_get_lowest_dev);
8323 static void netdev_adjacent_add_links(struct net_device *dev)
8325 struct netdev_adjacent *iter;
8327 struct net *net = dev_net(dev);
8329 list_for_each_entry(iter, &dev->adj_list.upper, list) {
8330 if (!net_eq(net, dev_net(iter->dev)))
8332 netdev_adjacent_sysfs_add(iter->dev, dev,
8333 &iter->dev->adj_list.lower);
8334 netdev_adjacent_sysfs_add(dev, iter->dev,
8335 &dev->adj_list.upper);
8338 list_for_each_entry(iter, &dev->adj_list.lower, list) {
8339 if (!net_eq(net, dev_net(iter->dev)))
8341 netdev_adjacent_sysfs_add(iter->dev, dev,
8342 &iter->dev->adj_list.upper);
8343 netdev_adjacent_sysfs_add(dev, iter->dev,
8344 &dev->adj_list.lower);
8348 static void netdev_adjacent_del_links(struct net_device *dev)
8350 struct netdev_adjacent *iter;
8352 struct net *net = dev_net(dev);
8354 list_for_each_entry(iter, &dev->adj_list.upper, list) {
8355 if (!net_eq(net, dev_net(iter->dev)))
8357 netdev_adjacent_sysfs_del(iter->dev, dev->name,
8358 &iter->dev->adj_list.lower);
8359 netdev_adjacent_sysfs_del(dev, iter->dev->name,
8360 &dev->adj_list.upper);
8363 list_for_each_entry(iter, &dev->adj_list.lower, list) {
8364 if (!net_eq(net, dev_net(iter->dev)))
8366 netdev_adjacent_sysfs_del(iter->dev, dev->name,
8367 &iter->dev->adj_list.upper);
8368 netdev_adjacent_sysfs_del(dev, iter->dev->name,
8369 &dev->adj_list.lower);
8373 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
8375 struct netdev_adjacent *iter;
8377 struct net *net = dev_net(dev);
8379 list_for_each_entry(iter, &dev->adj_list.upper, list) {
8380 if (!net_eq(net, dev_net(iter->dev)))
8382 netdev_adjacent_sysfs_del(iter->dev, oldname,
8383 &iter->dev->adj_list.lower);
8384 netdev_adjacent_sysfs_add(iter->dev, dev,
8385 &iter->dev->adj_list.lower);
8388 list_for_each_entry(iter, &dev->adj_list.lower, list) {
8389 if (!net_eq(net, dev_net(iter->dev)))
8391 netdev_adjacent_sysfs_del(iter->dev, oldname,
8392 &iter->dev->adj_list.upper);
8393 netdev_adjacent_sysfs_add(iter->dev, dev,
8394 &iter->dev->adj_list.upper);
8398 void *netdev_lower_dev_get_private(struct net_device *dev,
8399 struct net_device *lower_dev)
8401 struct netdev_adjacent *lower;
8405 lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
8409 return lower->private;
8411 EXPORT_SYMBOL(netdev_lower_dev_get_private);
8415 * netdev_lower_state_changed - Dispatch event about lower device state change
8416 * @lower_dev: device
8417 * @lower_state_info: state to dispatch
8419 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
8420 * The caller must hold the RTNL lock.
8422 void netdev_lower_state_changed(struct net_device *lower_dev,
8423 void *lower_state_info)
8425 struct netdev_notifier_changelowerstate_info changelowerstate_info = {
8426 .info.dev = lower_dev,
8430 changelowerstate_info.lower_state_info = lower_state_info;
8431 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE,
8432 &changelowerstate_info.info);
8434 EXPORT_SYMBOL(netdev_lower_state_changed);
8436 static void dev_change_rx_flags(struct net_device *dev, int flags)
8438 const struct net_device_ops *ops = dev->netdev_ops;
8440 if (ops->ndo_change_rx_flags)
8441 ops->ndo_change_rx_flags(dev, flags);
8444 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
8446 unsigned int old_flags = dev->flags;
8452 dev->flags |= IFF_PROMISC;
8453 dev->promiscuity += inc;
8454 if (dev->promiscuity == 0) {
8457 * If inc causes overflow, untouch promisc and return error.
8460 dev->flags &= ~IFF_PROMISC;
8462 dev->promiscuity -= inc;
8463 netdev_warn(dev, "promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n");
8467 if (dev->flags != old_flags) {
8468 netdev_info(dev, "%s promiscuous mode\n",
8469 dev->flags & IFF_PROMISC ? "entered" : "left");
8470 if (audit_enabled) {
8471 current_uid_gid(&uid, &gid);
8472 audit_log(audit_context(), GFP_ATOMIC,
8473 AUDIT_ANOM_PROMISCUOUS,
8474 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
8475 dev->name, (dev->flags & IFF_PROMISC),
8476 (old_flags & IFF_PROMISC),
8477 from_kuid(&init_user_ns, audit_get_loginuid(current)),
8478 from_kuid(&init_user_ns, uid),
8479 from_kgid(&init_user_ns, gid),
8480 audit_get_sessionid(current));
8483 dev_change_rx_flags(dev, IFF_PROMISC);
8486 __dev_notify_flags(dev, old_flags, IFF_PROMISC, 0, NULL);
8491 * dev_set_promiscuity - update promiscuity count on a device
8495 * Add or remove promiscuity from a device. While the count in the device
8496 * remains above zero the interface remains promiscuous. Once it hits zero
8497 * the device reverts back to normal filtering operation. A negative inc
8498 * value is used to drop promiscuity on the device.
8499 * Return 0 if successful or a negative errno code on error.
8501 int dev_set_promiscuity(struct net_device *dev, int inc)
8503 unsigned int old_flags = dev->flags;
8506 err = __dev_set_promiscuity(dev, inc, true);
8509 if (dev->flags != old_flags)
8510 dev_set_rx_mode(dev);
8513 EXPORT_SYMBOL(dev_set_promiscuity);
8515 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
8517 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
8521 dev->flags |= IFF_ALLMULTI;
8522 dev->allmulti += inc;
8523 if (dev->allmulti == 0) {
8526 * If inc causes overflow, untouch allmulti and return error.
8529 dev->flags &= ~IFF_ALLMULTI;
8531 dev->allmulti -= inc;
8532 netdev_warn(dev, "allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n");
8536 if (dev->flags ^ old_flags) {
8537 netdev_info(dev, "%s allmulticast mode\n",
8538 dev->flags & IFF_ALLMULTI ? "entered" : "left");
8539 dev_change_rx_flags(dev, IFF_ALLMULTI);
8540 dev_set_rx_mode(dev);
8542 __dev_notify_flags(dev, old_flags,
8543 dev->gflags ^ old_gflags, 0, NULL);
8549 * dev_set_allmulti - update allmulti count on a device
8553 * Add or remove reception of all multicast frames to a device. While the
8554 * count in the device remains above zero the interface remains listening
8555 * to all interfaces. Once it hits zero the device reverts back to normal
8556 * filtering operation. A negative @inc value is used to drop the counter
8557 * when releasing a resource needing all multicasts.
8558 * Return 0 if successful or a negative errno code on error.
8561 int dev_set_allmulti(struct net_device *dev, int inc)
8563 return __dev_set_allmulti(dev, inc, true);
8565 EXPORT_SYMBOL(dev_set_allmulti);
8568 * Upload unicast and multicast address lists to device and
8569 * configure RX filtering. When the device doesn't support unicast
8570 * filtering it is put in promiscuous mode while unicast addresses
8573 void __dev_set_rx_mode(struct net_device *dev)
8575 const struct net_device_ops *ops = dev->netdev_ops;
8577 /* dev_open will call this function so the list will stay sane. */
8578 if (!(dev->flags&IFF_UP))
8581 if (!netif_device_present(dev))
8584 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
8585 /* Unicast addresses changes may only happen under the rtnl,
8586 * therefore calling __dev_set_promiscuity here is safe.
8588 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
8589 __dev_set_promiscuity(dev, 1, false);
8590 dev->uc_promisc = true;
8591 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
8592 __dev_set_promiscuity(dev, -1, false);
8593 dev->uc_promisc = false;
8597 if (ops->ndo_set_rx_mode)
8598 ops->ndo_set_rx_mode(dev);
8601 void dev_set_rx_mode(struct net_device *dev)
8603 netif_addr_lock_bh(dev);
8604 __dev_set_rx_mode(dev);
8605 netif_addr_unlock_bh(dev);
8609 * dev_get_flags - get flags reported to userspace
8612 * Get the combination of flag bits exported through APIs to userspace.
8614 unsigned int dev_get_flags(const struct net_device *dev)
8618 flags = (dev->flags & ~(IFF_PROMISC |
8623 (dev->gflags & (IFF_PROMISC |
8626 if (netif_running(dev)) {
8627 if (netif_oper_up(dev))
8628 flags |= IFF_RUNNING;
8629 if (netif_carrier_ok(dev))
8630 flags |= IFF_LOWER_UP;
8631 if (netif_dormant(dev))
8632 flags |= IFF_DORMANT;
8637 EXPORT_SYMBOL(dev_get_flags);
8639 int __dev_change_flags(struct net_device *dev, unsigned int flags,
8640 struct netlink_ext_ack *extack)
8642 unsigned int old_flags = dev->flags;
8648 * Set the flags on our device.
8651 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
8652 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
8654 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
8658 * Load in the correct multicast list now the flags have changed.
8661 if ((old_flags ^ flags) & IFF_MULTICAST)
8662 dev_change_rx_flags(dev, IFF_MULTICAST);
8664 dev_set_rx_mode(dev);
8667 * Have we downed the interface. We handle IFF_UP ourselves
8668 * according to user attempts to set it, rather than blindly
8673 if ((old_flags ^ flags) & IFF_UP) {
8674 if (old_flags & IFF_UP)
8677 ret = __dev_open(dev, extack);
8680 if ((flags ^ dev->gflags) & IFF_PROMISC) {
8681 int inc = (flags & IFF_PROMISC) ? 1 : -1;
8682 unsigned int old_flags = dev->flags;
8684 dev->gflags ^= IFF_PROMISC;
8686 if (__dev_set_promiscuity(dev, inc, false) >= 0)
8687 if (dev->flags != old_flags)
8688 dev_set_rx_mode(dev);
8691 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
8692 * is important. Some (broken) drivers set IFF_PROMISC, when
8693 * IFF_ALLMULTI is requested not asking us and not reporting.
8695 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
8696 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
8698 dev->gflags ^= IFF_ALLMULTI;
8699 __dev_set_allmulti(dev, inc, false);
8705 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
8706 unsigned int gchanges, u32 portid,
8707 const struct nlmsghdr *nlh)
8709 unsigned int changes = dev->flags ^ old_flags;
8712 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC, portid, nlh);
8714 if (changes & IFF_UP) {
8715 if (dev->flags & IFF_UP)
8716 call_netdevice_notifiers(NETDEV_UP, dev);
8718 call_netdevice_notifiers(NETDEV_DOWN, dev);
8721 if (dev->flags & IFF_UP &&
8722 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
8723 struct netdev_notifier_change_info change_info = {
8727 .flags_changed = changes,
8730 call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info);
8735 * dev_change_flags - change device settings
8737 * @flags: device state flags
8738 * @extack: netlink extended ack
8740 * Change settings on device based state flags. The flags are
8741 * in the userspace exported format.
8743 int dev_change_flags(struct net_device *dev, unsigned int flags,
8744 struct netlink_ext_ack *extack)
8747 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
8749 ret = __dev_change_flags(dev, flags, extack);
8753 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
8754 __dev_notify_flags(dev, old_flags, changes, 0, NULL);
8757 EXPORT_SYMBOL(dev_change_flags);
8759 int __dev_set_mtu(struct net_device *dev, int new_mtu)
8761 const struct net_device_ops *ops = dev->netdev_ops;
8763 if (ops->ndo_change_mtu)
8764 return ops->ndo_change_mtu(dev, new_mtu);
8766 /* Pairs with all the lockless reads of dev->mtu in the stack */
8767 WRITE_ONCE(dev->mtu, new_mtu);
8770 EXPORT_SYMBOL(__dev_set_mtu);
8772 int dev_validate_mtu(struct net_device *dev, int new_mtu,
8773 struct netlink_ext_ack *extack)
8775 /* MTU must be positive, and in range */
8776 if (new_mtu < 0 || new_mtu < dev->min_mtu) {
8777 NL_SET_ERR_MSG(extack, "mtu less than device minimum");
8781 if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) {
8782 NL_SET_ERR_MSG(extack, "mtu greater than device maximum");
8789 * dev_set_mtu_ext - Change maximum transfer unit
8791 * @new_mtu: new transfer unit
8792 * @extack: netlink extended ack
8794 * Change the maximum transfer size of the network device.
8796 int dev_set_mtu_ext(struct net_device *dev, int new_mtu,
8797 struct netlink_ext_ack *extack)
8801 if (new_mtu == dev->mtu)
8804 err = dev_validate_mtu(dev, new_mtu, extack);
8808 if (!netif_device_present(dev))
8811 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
8812 err = notifier_to_errno(err);
8816 orig_mtu = dev->mtu;
8817 err = __dev_set_mtu(dev, new_mtu);
8820 err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
8822 err = notifier_to_errno(err);
8824 /* setting mtu back and notifying everyone again,
8825 * so that they have a chance to revert changes.
8827 __dev_set_mtu(dev, orig_mtu);
8828 call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
8835 int dev_set_mtu(struct net_device *dev, int new_mtu)
8837 struct netlink_ext_ack extack;
8840 memset(&extack, 0, sizeof(extack));
8841 err = dev_set_mtu_ext(dev, new_mtu, &extack);
8842 if (err && extack._msg)
8843 net_err_ratelimited("%s: %s\n", dev->name, extack._msg);
8846 EXPORT_SYMBOL(dev_set_mtu);
8849 * dev_change_tx_queue_len - Change TX queue length of a netdevice
8851 * @new_len: new tx queue length
8853 int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len)
8855 unsigned int orig_len = dev->tx_queue_len;
8858 if (new_len != (unsigned int)new_len)
8861 if (new_len != orig_len) {
8862 dev->tx_queue_len = new_len;
8863 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
8864 res = notifier_to_errno(res);
8867 res = dev_qdisc_change_tx_queue_len(dev);
8875 netdev_err(dev, "refused to change device tx_queue_len\n");
8876 dev->tx_queue_len = orig_len;
8881 * dev_set_group - Change group this device belongs to
8883 * @new_group: group this device should belong to
8885 void dev_set_group(struct net_device *dev, int new_group)
8887 dev->group = new_group;
8891 * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR.
8893 * @addr: new address
8894 * @extack: netlink extended ack
8896 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
8897 struct netlink_ext_ack *extack)
8899 struct netdev_notifier_pre_changeaddr_info info = {
8901 .info.extack = extack,
8906 rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info);
8907 return notifier_to_errno(rc);
8909 EXPORT_SYMBOL(dev_pre_changeaddr_notify);
8912 * dev_set_mac_address - Change Media Access Control Address
8915 * @extack: netlink extended ack
8917 * Change the hardware (MAC) address of the device
8919 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
8920 struct netlink_ext_ack *extack)
8922 const struct net_device_ops *ops = dev->netdev_ops;
8925 if (!ops->ndo_set_mac_address)
8927 if (sa->sa_family != dev->type)
8929 if (!netif_device_present(dev))
8931 err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack);
8934 if (memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) {
8935 err = ops->ndo_set_mac_address(dev, sa);
8939 dev->addr_assign_type = NET_ADDR_SET;
8940 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
8941 add_device_randomness(dev->dev_addr, dev->addr_len);
8944 EXPORT_SYMBOL(dev_set_mac_address);
8946 static DECLARE_RWSEM(dev_addr_sem);
8948 int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
8949 struct netlink_ext_ack *extack)
8953 down_write(&dev_addr_sem);
8954 ret = dev_set_mac_address(dev, sa, extack);
8955 up_write(&dev_addr_sem);
8958 EXPORT_SYMBOL(dev_set_mac_address_user);
8960 int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name)
8962 size_t size = sizeof(sa->sa_data_min);
8963 struct net_device *dev;
8966 down_read(&dev_addr_sem);
8969 dev = dev_get_by_name_rcu(net, dev_name);
8975 memset(sa->sa_data, 0, size);
8977 memcpy(sa->sa_data, dev->dev_addr,
8978 min_t(size_t, size, dev->addr_len));
8979 sa->sa_family = dev->type;
8983 up_read(&dev_addr_sem);
8986 EXPORT_SYMBOL(dev_get_mac_address);
8989 * dev_change_carrier - Change device carrier
8991 * @new_carrier: new value
8993 * Change device carrier
8995 int dev_change_carrier(struct net_device *dev, bool new_carrier)
8997 const struct net_device_ops *ops = dev->netdev_ops;
8999 if (!ops->ndo_change_carrier)
9001 if (!netif_device_present(dev))
9003 return ops->ndo_change_carrier(dev, new_carrier);
9007 * dev_get_phys_port_id - Get device physical port ID
9011 * Get device physical port ID
9013 int dev_get_phys_port_id(struct net_device *dev,
9014 struct netdev_phys_item_id *ppid)
9016 const struct net_device_ops *ops = dev->netdev_ops;
9018 if (!ops->ndo_get_phys_port_id)
9020 return ops->ndo_get_phys_port_id(dev, ppid);
9024 * dev_get_phys_port_name - Get device physical port name
9027 * @len: limit of bytes to copy to name
9029 * Get device physical port name
9031 int dev_get_phys_port_name(struct net_device *dev,
9032 char *name, size_t len)
9034 const struct net_device_ops *ops = dev->netdev_ops;
9037 if (ops->ndo_get_phys_port_name) {
9038 err = ops->ndo_get_phys_port_name(dev, name, len);
9039 if (err != -EOPNOTSUPP)
9042 return devlink_compat_phys_port_name_get(dev, name, len);
9046 * dev_get_port_parent_id - Get the device's port parent identifier
9047 * @dev: network device
9048 * @ppid: pointer to a storage for the port's parent identifier
9049 * @recurse: allow/disallow recursion to lower devices
9051 * Get the devices's port parent identifier
9053 int dev_get_port_parent_id(struct net_device *dev,
9054 struct netdev_phys_item_id *ppid,
9057 const struct net_device_ops *ops = dev->netdev_ops;
9058 struct netdev_phys_item_id first = { };
9059 struct net_device *lower_dev;
9060 struct list_head *iter;
9063 if (ops->ndo_get_port_parent_id) {
9064 err = ops->ndo_get_port_parent_id(dev, ppid);
9065 if (err != -EOPNOTSUPP)
9069 err = devlink_compat_switch_id_get(dev, ppid);
9070 if (!recurse || err != -EOPNOTSUPP)
9073 netdev_for_each_lower_dev(dev, lower_dev, iter) {
9074 err = dev_get_port_parent_id(lower_dev, ppid, true);
9079 else if (memcmp(&first, ppid, sizeof(*ppid)))
9085 EXPORT_SYMBOL(dev_get_port_parent_id);
9088 * netdev_port_same_parent_id - Indicate if two network devices have
9089 * the same port parent identifier
9090 * @a: first network device
9091 * @b: second network device
9093 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b)
9095 struct netdev_phys_item_id a_id = { };
9096 struct netdev_phys_item_id b_id = { };
9098 if (dev_get_port_parent_id(a, &a_id, true) ||
9099 dev_get_port_parent_id(b, &b_id, true))
9102 return netdev_phys_item_id_same(&a_id, &b_id);
9104 EXPORT_SYMBOL(netdev_port_same_parent_id);
9107 * dev_change_proto_down - set carrier according to proto_down.
9110 * @proto_down: new value
9112 int dev_change_proto_down(struct net_device *dev, bool proto_down)
9114 if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN))
9116 if (!netif_device_present(dev))
9119 netif_carrier_off(dev);
9121 netif_carrier_on(dev);
9122 dev->proto_down = proto_down;
9127 * dev_change_proto_down_reason - proto down reason
9130 * @mask: proto down mask
9131 * @value: proto down value
9133 void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
9139 dev->proto_down_reason = value;
9141 for_each_set_bit(b, &mask, 32) {
9142 if (value & (1 << b))
9143 dev->proto_down_reason |= BIT(b);
9145 dev->proto_down_reason &= ~BIT(b);
9150 struct bpf_xdp_link {
9151 struct bpf_link link;
9152 struct net_device *dev; /* protected by rtnl_lock, no refcnt held */
9156 static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags)
9158 if (flags & XDP_FLAGS_HW_MODE)
9160 if (flags & XDP_FLAGS_DRV_MODE)
9161 return XDP_MODE_DRV;
9162 if (flags & XDP_FLAGS_SKB_MODE)
9163 return XDP_MODE_SKB;
9164 return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB;
9167 static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode)
9171 return generic_xdp_install;
9174 return dev->netdev_ops->ndo_bpf;
9180 static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev,
9181 enum bpf_xdp_mode mode)
9183 return dev->xdp_state[mode].link;
9186 static struct bpf_prog *dev_xdp_prog(struct net_device *dev,
9187 enum bpf_xdp_mode mode)
9189 struct bpf_xdp_link *link = dev_xdp_link(dev, mode);
9192 return link->link.prog;
9193 return dev->xdp_state[mode].prog;
9196 u8 dev_xdp_prog_count(struct net_device *dev)
9201 for (i = 0; i < __MAX_XDP_MODE; i++)
9202 if (dev->xdp_state[i].prog || dev->xdp_state[i].link)
9206 EXPORT_SYMBOL_GPL(dev_xdp_prog_count);
9208 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode)
9210 struct bpf_prog *prog = dev_xdp_prog(dev, mode);
9212 return prog ? prog->aux->id : 0;
9215 static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode,
9216 struct bpf_xdp_link *link)
9218 dev->xdp_state[mode].link = link;
9219 dev->xdp_state[mode].prog = NULL;
9222 static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode,
9223 struct bpf_prog *prog)
9225 dev->xdp_state[mode].link = NULL;
9226 dev->xdp_state[mode].prog = prog;
9229 static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode,
9230 bpf_op_t bpf_op, struct netlink_ext_ack *extack,
9231 u32 flags, struct bpf_prog *prog)
9233 struct netdev_bpf xdp;
9236 memset(&xdp, 0, sizeof(xdp));
9237 xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG;
9238 xdp.extack = extack;
9242 /* Drivers assume refcnt is already incremented (i.e, prog pointer is
9243 * "moved" into driver), so they don't increment it on their own, but
9244 * they do decrement refcnt when program is detached or replaced.
9245 * Given net_device also owns link/prog, we need to bump refcnt here
9246 * to prevent drivers from underflowing it.
9250 err = bpf_op(dev, &xdp);
9257 if (mode != XDP_MODE_HW)
9258 bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog);
9263 static void dev_xdp_uninstall(struct net_device *dev)
9265 struct bpf_xdp_link *link;
9266 struct bpf_prog *prog;
9267 enum bpf_xdp_mode mode;
9272 for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) {
9273 prog = dev_xdp_prog(dev, mode);
9277 bpf_op = dev_xdp_bpf_op(dev, mode);
9281 WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL));
9283 /* auto-detach link from net device */
9284 link = dev_xdp_link(dev, mode);
9290 dev_xdp_set_link(dev, mode, NULL);
9294 static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack,
9295 struct bpf_xdp_link *link, struct bpf_prog *new_prog,
9296 struct bpf_prog *old_prog, u32 flags)
9298 unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES);
9299 struct bpf_prog *cur_prog;
9300 struct net_device *upper;
9301 struct list_head *iter;
9302 enum bpf_xdp_mode mode;
9308 /* either link or prog attachment, never both */
9309 if (link && (new_prog || old_prog))
9311 /* link supports only XDP mode flags */
9312 if (link && (flags & ~XDP_FLAGS_MODES)) {
9313 NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment");
9316 /* just one XDP mode bit should be set, zero defaults to drv/skb mode */
9317 if (num_modes > 1) {
9318 NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set");
9321 /* avoid ambiguity if offload + drv/skb mode progs are both loaded */
9322 if (!num_modes && dev_xdp_prog_count(dev) > 1) {
9323 NL_SET_ERR_MSG(extack,
9324 "More than one program loaded, unset mode is ambiguous");
9327 /* old_prog != NULL implies XDP_FLAGS_REPLACE is set */
9328 if (old_prog && !(flags & XDP_FLAGS_REPLACE)) {
9329 NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified");
9333 mode = dev_xdp_mode(dev, flags);
9334 /* can't replace attached link */
9335 if (dev_xdp_link(dev, mode)) {
9336 NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link");
9340 /* don't allow if an upper device already has a program */
9341 netdev_for_each_upper_dev_rcu(dev, upper, iter) {
9342 if (dev_xdp_prog_count(upper) > 0) {
9343 NL_SET_ERR_MSG(extack, "Cannot attach when an upper device already has a program");
9348 cur_prog = dev_xdp_prog(dev, mode);
9349 /* can't replace attached prog with link */
9350 if (link && cur_prog) {
9351 NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link");
9354 if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) {
9355 NL_SET_ERR_MSG(extack, "Active program does not match expected");
9359 /* put effective new program into new_prog */
9361 new_prog = link->link.prog;
9364 bool offload = mode == XDP_MODE_HW;
9365 enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB
9366 ? XDP_MODE_DRV : XDP_MODE_SKB;
9368 if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) {
9369 NL_SET_ERR_MSG(extack, "XDP program already attached");
9372 if (!offload && dev_xdp_prog(dev, other_mode)) {
9373 NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time");
9376 if (!offload && bpf_prog_is_offloaded(new_prog->aux)) {
9377 NL_SET_ERR_MSG(extack, "Using offloaded program without HW_MODE flag is not supported");
9380 if (bpf_prog_is_dev_bound(new_prog->aux) && !bpf_offload_dev_match(new_prog, dev)) {
9381 NL_SET_ERR_MSG(extack, "Program bound to different device");
9384 if (new_prog->expected_attach_type == BPF_XDP_DEVMAP) {
9385 NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device");
9388 if (new_prog->expected_attach_type == BPF_XDP_CPUMAP) {
9389 NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device");
9394 /* don't call drivers if the effective program didn't change */
9395 if (new_prog != cur_prog) {
9396 bpf_op = dev_xdp_bpf_op(dev, mode);
9398 NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode");
9402 err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog);
9408 dev_xdp_set_link(dev, mode, link);
9410 dev_xdp_set_prog(dev, mode, new_prog);
9412 bpf_prog_put(cur_prog);
9417 static int dev_xdp_attach_link(struct net_device *dev,
9418 struct netlink_ext_ack *extack,
9419 struct bpf_xdp_link *link)
9421 return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags);
9424 static int dev_xdp_detach_link(struct net_device *dev,
9425 struct netlink_ext_ack *extack,
9426 struct bpf_xdp_link *link)
9428 enum bpf_xdp_mode mode;
9433 mode = dev_xdp_mode(dev, link->flags);
9434 if (dev_xdp_link(dev, mode) != link)
9437 bpf_op = dev_xdp_bpf_op(dev, mode);
9438 WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL));
9439 dev_xdp_set_link(dev, mode, NULL);
9443 static void bpf_xdp_link_release(struct bpf_link *link)
9445 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9449 /* if racing with net_device's tear down, xdp_link->dev might be
9450 * already NULL, in which case link was already auto-detached
9452 if (xdp_link->dev) {
9453 WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link));
9454 xdp_link->dev = NULL;
9460 static int bpf_xdp_link_detach(struct bpf_link *link)
9462 bpf_xdp_link_release(link);
9466 static void bpf_xdp_link_dealloc(struct bpf_link *link)
9468 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9473 static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link,
9474 struct seq_file *seq)
9476 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9481 ifindex = xdp_link->dev->ifindex;
9484 seq_printf(seq, "ifindex:\t%u\n", ifindex);
9487 static int bpf_xdp_link_fill_link_info(const struct bpf_link *link,
9488 struct bpf_link_info *info)
9490 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9495 ifindex = xdp_link->dev->ifindex;
9498 info->xdp.ifindex = ifindex;
9502 static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog,
9503 struct bpf_prog *old_prog)
9505 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9506 enum bpf_xdp_mode mode;
9512 /* link might have been auto-released already, so fail */
9513 if (!xdp_link->dev) {
9518 if (old_prog && link->prog != old_prog) {
9522 old_prog = link->prog;
9523 if (old_prog->type != new_prog->type ||
9524 old_prog->expected_attach_type != new_prog->expected_attach_type) {
9529 if (old_prog == new_prog) {
9530 /* no-op, don't disturb drivers */
9531 bpf_prog_put(new_prog);
9535 mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags);
9536 bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode);
9537 err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL,
9538 xdp_link->flags, new_prog);
9542 old_prog = xchg(&link->prog, new_prog);
9543 bpf_prog_put(old_prog);
9550 static const struct bpf_link_ops bpf_xdp_link_lops = {
9551 .release = bpf_xdp_link_release,
9552 .dealloc = bpf_xdp_link_dealloc,
9553 .detach = bpf_xdp_link_detach,
9554 .show_fdinfo = bpf_xdp_link_show_fdinfo,
9555 .fill_link_info = bpf_xdp_link_fill_link_info,
9556 .update_prog = bpf_xdp_link_update,
9559 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
9561 struct net *net = current->nsproxy->net_ns;
9562 struct bpf_link_primer link_primer;
9563 struct netlink_ext_ack extack = {};
9564 struct bpf_xdp_link *link;
9565 struct net_device *dev;
9569 dev = dev_get_by_index(net, attr->link_create.target_ifindex);
9575 link = kzalloc(sizeof(*link), GFP_USER);
9581 bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog);
9583 link->flags = attr->link_create.flags;
9585 err = bpf_link_prime(&link->link, &link_primer);
9591 err = dev_xdp_attach_link(dev, &extack, link);
9596 bpf_link_cleanup(&link_primer);
9597 trace_bpf_xdp_link_attach_failed(extack._msg);
9601 fd = bpf_link_settle(&link_primer);
9602 /* link itself doesn't hold dev's refcnt to not complicate shutdown */
9615 * dev_change_xdp_fd - set or clear a bpf program for a device rx path
9617 * @extack: netlink extended ack
9618 * @fd: new program fd or negative value to clear
9619 * @expected_fd: old program fd that userspace expects to replace or clear
9620 * @flags: xdp-related flags
9622 * Set or clear a bpf program for a device
9624 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
9625 int fd, int expected_fd, u32 flags)
9627 enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags);
9628 struct bpf_prog *new_prog = NULL, *old_prog = NULL;
9634 new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,
9635 mode != XDP_MODE_SKB);
9636 if (IS_ERR(new_prog))
9637 return PTR_ERR(new_prog);
9640 if (expected_fd >= 0) {
9641 old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP,
9642 mode != XDP_MODE_SKB);
9643 if (IS_ERR(old_prog)) {
9644 err = PTR_ERR(old_prog);
9650 err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags);
9653 if (err && new_prog)
9654 bpf_prog_put(new_prog);
9656 bpf_prog_put(old_prog);
9661 * dev_index_reserve() - allocate an ifindex in a namespace
9662 * @net: the applicable net namespace
9663 * @ifindex: requested ifindex, pass %0 to get one allocated
9665 * Allocate a ifindex for a new device. Caller must either use the ifindex
9666 * to store the device (via list_netdevice()) or call dev_index_release()
9667 * to give the index up.
9669 * Return: a suitable unique value for a new device interface number or -errno.
9671 static int dev_index_reserve(struct net *net, u32 ifindex)
9675 if (ifindex > INT_MAX) {
9676 DEBUG_NET_WARN_ON_ONCE(1);
9681 err = xa_alloc_cyclic(&net->dev_by_index, &ifindex, NULL,
9682 xa_limit_31b, &net->ifindex, GFP_KERNEL);
9684 err = xa_insert(&net->dev_by_index, ifindex, NULL, GFP_KERNEL);
9691 static void dev_index_release(struct net *net, int ifindex)
9693 /* Expect only unused indexes, unlist_netdevice() removes the used */
9694 WARN_ON(xa_erase(&net->dev_by_index, ifindex));
9697 /* Delayed registration/unregisteration */
9698 LIST_HEAD(net_todo_list);
9699 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
9701 static void net_set_todo(struct net_device *dev)
9703 list_add_tail(&dev->todo_list, &net_todo_list);
9704 atomic_inc(&dev_net(dev)->dev_unreg_count);
9707 static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
9708 struct net_device *upper, netdev_features_t features)
9710 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
9711 netdev_features_t feature;
9714 for_each_netdev_feature(upper_disables, feature_bit) {
9715 feature = __NETIF_F_BIT(feature_bit);
9716 if (!(upper->wanted_features & feature)
9717 && (features & feature)) {
9718 netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
9719 &feature, upper->name);
9720 features &= ~feature;
9727 static void netdev_sync_lower_features(struct net_device *upper,
9728 struct net_device *lower, netdev_features_t features)
9730 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
9731 netdev_features_t feature;
9734 for_each_netdev_feature(upper_disables, feature_bit) {
9735 feature = __NETIF_F_BIT(feature_bit);
9736 if (!(features & feature) && (lower->features & feature)) {
9737 netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
9738 &feature, lower->name);
9739 lower->wanted_features &= ~feature;
9740 __netdev_update_features(lower);
9742 if (unlikely(lower->features & feature))
9743 netdev_WARN(upper, "failed to disable %pNF on %s!\n",
9744 &feature, lower->name);
9746 netdev_features_change(lower);
9751 static netdev_features_t netdev_fix_features(struct net_device *dev,
9752 netdev_features_t features)
9754 /* Fix illegal checksum combinations */
9755 if ((features & NETIF_F_HW_CSUM) &&
9756 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
9757 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
9758 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
9761 /* TSO requires that SG is present as well. */
9762 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
9763 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
9764 features &= ~NETIF_F_ALL_TSO;
9767 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
9768 !(features & NETIF_F_IP_CSUM)) {
9769 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
9770 features &= ~NETIF_F_TSO;
9771 features &= ~NETIF_F_TSO_ECN;
9774 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
9775 !(features & NETIF_F_IPV6_CSUM)) {
9776 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
9777 features &= ~NETIF_F_TSO6;
9780 /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
9781 if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO))
9782 features &= ~NETIF_F_TSO_MANGLEID;
9784 /* TSO ECN requires that TSO is present as well. */
9785 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
9786 features &= ~NETIF_F_TSO_ECN;
9788 /* Software GSO depends on SG. */
9789 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
9790 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
9791 features &= ~NETIF_F_GSO;
9794 /* GSO partial features require GSO partial be set */
9795 if ((features & dev->gso_partial_features) &&
9796 !(features & NETIF_F_GSO_PARTIAL)) {
9798 "Dropping partially supported GSO features since no GSO partial.\n");
9799 features &= ~dev->gso_partial_features;
9802 if (!(features & NETIF_F_RXCSUM)) {
9803 /* NETIF_F_GRO_HW implies doing RXCSUM since every packet
9804 * successfully merged by hardware must also have the
9805 * checksum verified by hardware. If the user does not
9806 * want to enable RXCSUM, logically, we should disable GRO_HW.
9808 if (features & NETIF_F_GRO_HW) {
9809 netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n");
9810 features &= ~NETIF_F_GRO_HW;
9814 /* LRO/HW-GRO features cannot be combined with RX-FCS */
9815 if (features & NETIF_F_RXFCS) {
9816 if (features & NETIF_F_LRO) {
9817 netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n");
9818 features &= ~NETIF_F_LRO;
9821 if (features & NETIF_F_GRO_HW) {
9822 netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n");
9823 features &= ~NETIF_F_GRO_HW;
9827 if ((features & NETIF_F_GRO_HW) && (features & NETIF_F_LRO)) {
9828 netdev_dbg(dev, "Dropping LRO feature since HW-GRO is requested.\n");
9829 features &= ~NETIF_F_LRO;
9832 if (features & NETIF_F_HW_TLS_TX) {
9833 bool ip_csum = (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) ==
9834 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
9835 bool hw_csum = features & NETIF_F_HW_CSUM;
9837 if (!ip_csum && !hw_csum) {
9838 netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n");
9839 features &= ~NETIF_F_HW_TLS_TX;
9843 if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) {
9844 netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n");
9845 features &= ~NETIF_F_HW_TLS_RX;
9851 int __netdev_update_features(struct net_device *dev)
9853 struct net_device *upper, *lower;
9854 netdev_features_t features;
9855 struct list_head *iter;
9860 features = netdev_get_wanted_features(dev);
9862 if (dev->netdev_ops->ndo_fix_features)
9863 features = dev->netdev_ops->ndo_fix_features(dev, features);
9865 /* driver might be less strict about feature dependencies */
9866 features = netdev_fix_features(dev, features);
9868 /* some features can't be enabled if they're off on an upper device */
9869 netdev_for_each_upper_dev_rcu(dev, upper, iter)
9870 features = netdev_sync_upper_features(dev, upper, features);
9872 if (dev->features == features)
9875 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
9876 &dev->features, &features);
9878 if (dev->netdev_ops->ndo_set_features)
9879 err = dev->netdev_ops->ndo_set_features(dev, features);
9883 if (unlikely(err < 0)) {
9885 "set_features() failed (%d); wanted %pNF, left %pNF\n",
9886 err, &features, &dev->features);
9887 /* return non-0 since some features might have changed and
9888 * it's better to fire a spurious notification than miss it
9894 /* some features must be disabled on lower devices when disabled
9895 * on an upper device (think: bonding master or bridge)
9897 netdev_for_each_lower_dev(dev, lower, iter)
9898 netdev_sync_lower_features(dev, lower, features);
9901 netdev_features_t diff = features ^ dev->features;
9903 if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) {
9904 /* udp_tunnel_{get,drop}_rx_info both need
9905 * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the
9906 * device, or they won't do anything.
9907 * Thus we need to update dev->features
9908 * *before* calling udp_tunnel_get_rx_info,
9909 * but *after* calling udp_tunnel_drop_rx_info.
9911 if (features & NETIF_F_RX_UDP_TUNNEL_PORT) {
9912 dev->features = features;
9913 udp_tunnel_get_rx_info(dev);
9915 udp_tunnel_drop_rx_info(dev);
9919 if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) {
9920 if (features & NETIF_F_HW_VLAN_CTAG_FILTER) {
9921 dev->features = features;
9922 err |= vlan_get_rx_ctag_filter_info(dev);
9924 vlan_drop_rx_ctag_filter_info(dev);
9928 if (diff & NETIF_F_HW_VLAN_STAG_FILTER) {
9929 if (features & NETIF_F_HW_VLAN_STAG_FILTER) {
9930 dev->features = features;
9931 err |= vlan_get_rx_stag_filter_info(dev);
9933 vlan_drop_rx_stag_filter_info(dev);
9937 dev->features = features;
9940 return err < 0 ? 0 : 1;
9944 * netdev_update_features - recalculate device features
9945 * @dev: the device to check
9947 * Recalculate dev->features set and send notifications if it
9948 * has changed. Should be called after driver or hardware dependent
9949 * conditions might have changed that influence the features.
9951 void netdev_update_features(struct net_device *dev)
9953 if (__netdev_update_features(dev))
9954 netdev_features_change(dev);
9956 EXPORT_SYMBOL(netdev_update_features);
9959 * netdev_change_features - recalculate device features
9960 * @dev: the device to check
9962 * Recalculate dev->features set and send notifications even
9963 * if they have not changed. Should be called instead of
9964 * netdev_update_features() if also dev->vlan_features might
9965 * have changed to allow the changes to be propagated to stacked
9968 void netdev_change_features(struct net_device *dev)
9970 __netdev_update_features(dev);
9971 netdev_features_change(dev);
9973 EXPORT_SYMBOL(netdev_change_features);
9976 * netif_stacked_transfer_operstate - transfer operstate
9977 * @rootdev: the root or lower level device to transfer state from
9978 * @dev: the device to transfer operstate to
9980 * Transfer operational state from root to device. This is normally
9981 * called when a stacking relationship exists between the root
9982 * device and the device(a leaf device).
9984 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
9985 struct net_device *dev)
9987 if (rootdev->operstate == IF_OPER_DORMANT)
9988 netif_dormant_on(dev);
9990 netif_dormant_off(dev);
9992 if (rootdev->operstate == IF_OPER_TESTING)
9993 netif_testing_on(dev);
9995 netif_testing_off(dev);
9997 if (netif_carrier_ok(rootdev))
9998 netif_carrier_on(dev);
10000 netif_carrier_off(dev);
10002 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
10004 static int netif_alloc_rx_queues(struct net_device *dev)
10006 unsigned int i, count = dev->num_rx_queues;
10007 struct netdev_rx_queue *rx;
10008 size_t sz = count * sizeof(*rx);
10013 rx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
10019 for (i = 0; i < count; i++) {
10022 /* XDP RX-queue setup */
10023 err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0);
10030 /* Rollback successful reg's and free other resources */
10032 xdp_rxq_info_unreg(&rx[i].xdp_rxq);
10038 static void netif_free_rx_queues(struct net_device *dev)
10040 unsigned int i, count = dev->num_rx_queues;
10042 /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */
10046 for (i = 0; i < count; i++)
10047 xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq);
10052 static void netdev_init_one_queue(struct net_device *dev,
10053 struct netdev_queue *queue, void *_unused)
10055 /* Initialize queue lock */
10056 spin_lock_init(&queue->_xmit_lock);
10057 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
10058 queue->xmit_lock_owner = -1;
10059 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
10062 dql_init(&queue->dql, HZ);
10066 static void netif_free_tx_queues(struct net_device *dev)
10071 static int netif_alloc_netdev_queues(struct net_device *dev)
10073 unsigned int count = dev->num_tx_queues;
10074 struct netdev_queue *tx;
10075 size_t sz = count * sizeof(*tx);
10077 if (count < 1 || count > 0xffff)
10080 tx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
10086 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
10087 spin_lock_init(&dev->tx_global_lock);
10092 void netif_tx_stop_all_queues(struct net_device *dev)
10096 for (i = 0; i < dev->num_tx_queues; i++) {
10097 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
10099 netif_tx_stop_queue(txq);
10102 EXPORT_SYMBOL(netif_tx_stop_all_queues);
10104 static int netdev_do_alloc_pcpu_stats(struct net_device *dev)
10108 /* Drivers implementing ndo_get_peer_dev must support tstat
10109 * accounting, so that skb_do_redirect() can bump the dev's
10110 * RX stats upon network namespace switch.
10112 if (dev->netdev_ops->ndo_get_peer_dev &&
10113 dev->pcpu_stat_type != NETDEV_PCPU_STAT_TSTATS)
10114 return -EOPNOTSUPP;
10116 switch (dev->pcpu_stat_type) {
10117 case NETDEV_PCPU_STAT_NONE:
10119 case NETDEV_PCPU_STAT_LSTATS:
10120 v = dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
10122 case NETDEV_PCPU_STAT_TSTATS:
10123 v = dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
10125 case NETDEV_PCPU_STAT_DSTATS:
10126 v = dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
10132 return v ? 0 : -ENOMEM;
10135 static void netdev_do_free_pcpu_stats(struct net_device *dev)
10137 switch (dev->pcpu_stat_type) {
10138 case NETDEV_PCPU_STAT_NONE:
10140 case NETDEV_PCPU_STAT_LSTATS:
10141 free_percpu(dev->lstats);
10143 case NETDEV_PCPU_STAT_TSTATS:
10144 free_percpu(dev->tstats);
10146 case NETDEV_PCPU_STAT_DSTATS:
10147 free_percpu(dev->dstats);
10153 * register_netdevice() - register a network device
10154 * @dev: device to register
10156 * Take a prepared network device structure and make it externally accessible.
10157 * A %NETDEV_REGISTER message is sent to the netdev notifier chain.
10158 * Callers must hold the rtnl lock - you may want register_netdev()
10161 int register_netdevice(struct net_device *dev)
10164 struct net *net = dev_net(dev);
10166 BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE <
10167 NETDEV_FEATURE_COUNT);
10168 BUG_ON(dev_boot_phase);
10173 /* When net_device's are persistent, this will be fatal. */
10174 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
10177 ret = ethtool_check_ops(dev->ethtool_ops);
10181 spin_lock_init(&dev->addr_list_lock);
10182 netdev_set_addr_lockdep_class(dev);
10184 ret = dev_get_valid_name(net, dev, dev->name);
10189 dev->name_node = netdev_name_node_head_alloc(dev);
10190 if (!dev->name_node)
10193 /* Init, if this function is available */
10194 if (dev->netdev_ops->ndo_init) {
10195 ret = dev->netdev_ops->ndo_init(dev);
10199 goto err_free_name;
10203 if (((dev->hw_features | dev->features) &
10204 NETIF_F_HW_VLAN_CTAG_FILTER) &&
10205 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
10206 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
10207 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
10212 ret = netdev_do_alloc_pcpu_stats(dev);
10216 ret = dev_index_reserve(net, dev->ifindex);
10218 goto err_free_pcpu;
10219 dev->ifindex = ret;
10221 /* Transfer changeable features to wanted_features and enable
10222 * software offloads (GSO and GRO).
10224 dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF);
10225 dev->features |= NETIF_F_SOFT_FEATURES;
10227 if (dev->udp_tunnel_nic_info) {
10228 dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT;
10229 dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT;
10232 dev->wanted_features = dev->features & dev->hw_features;
10234 if (!(dev->flags & IFF_LOOPBACK))
10235 dev->hw_features |= NETIF_F_NOCACHE_COPY;
10237 /* If IPv4 TCP segmentation offload is supported we should also
10238 * allow the device to enable segmenting the frame with the option
10239 * of ignoring a static IP ID value. This doesn't enable the
10240 * feature itself but allows the user to enable it later.
10242 if (dev->hw_features & NETIF_F_TSO)
10243 dev->hw_features |= NETIF_F_TSO_MANGLEID;
10244 if (dev->vlan_features & NETIF_F_TSO)
10245 dev->vlan_features |= NETIF_F_TSO_MANGLEID;
10246 if (dev->mpls_features & NETIF_F_TSO)
10247 dev->mpls_features |= NETIF_F_TSO_MANGLEID;
10248 if (dev->hw_enc_features & NETIF_F_TSO)
10249 dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
10251 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
10253 dev->vlan_features |= NETIF_F_HIGHDMA;
10255 /* Make NETIF_F_SG inheritable to tunnel devices.
10257 dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
10259 /* Make NETIF_F_SG inheritable to MPLS.
10261 dev->mpls_features |= NETIF_F_SG;
10263 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
10264 ret = notifier_to_errno(ret);
10266 goto err_ifindex_release;
10268 ret = netdev_register_kobject(dev);
10269 write_lock(&dev_base_lock);
10270 dev->reg_state = ret ? NETREG_UNREGISTERED : NETREG_REGISTERED;
10271 write_unlock(&dev_base_lock);
10273 goto err_uninit_notify;
10275 __netdev_update_features(dev);
10278 * Default initial state at registry is that the
10279 * device is present.
10282 set_bit(__LINK_STATE_PRESENT, &dev->state);
10284 linkwatch_init_dev(dev);
10286 dev_init_scheduler(dev);
10288 netdev_hold(dev, &dev->dev_registered_tracker, GFP_KERNEL);
10289 list_netdevice(dev);
10291 add_device_randomness(dev->dev_addr, dev->addr_len);
10293 /* If the device has permanent device address, driver should
10294 * set dev_addr and also addr_assign_type should be set to
10295 * NET_ADDR_PERM (default value).
10297 if (dev->addr_assign_type == NET_ADDR_PERM)
10298 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
10300 /* Notify protocols, that a new device appeared. */
10301 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
10302 ret = notifier_to_errno(ret);
10304 /* Expect explicit free_netdev() on failure */
10305 dev->needs_free_netdev = false;
10306 unregister_netdevice_queue(dev, NULL);
10310 * Prevent userspace races by waiting until the network
10311 * device is fully setup before sending notifications.
10313 if (!dev->rtnl_link_ops ||
10314 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
10315 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL);
10321 call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);
10322 err_ifindex_release:
10323 dev_index_release(net, dev->ifindex);
10325 netdev_do_free_pcpu_stats(dev);
10327 if (dev->netdev_ops->ndo_uninit)
10328 dev->netdev_ops->ndo_uninit(dev);
10329 if (dev->priv_destructor)
10330 dev->priv_destructor(dev);
10332 netdev_name_node_free(dev->name_node);
10335 EXPORT_SYMBOL(register_netdevice);
10338 * init_dummy_netdev - init a dummy network device for NAPI
10339 * @dev: device to init
10341 * This takes a network device structure and initialize the minimum
10342 * amount of fields so it can be used to schedule NAPI polls without
10343 * registering a full blown interface. This is to be used by drivers
10344 * that need to tie several hardware interfaces to a single NAPI
10345 * poll scheduler due to HW limitations.
10347 int init_dummy_netdev(struct net_device *dev)
10349 /* Clear everything. Note we don't initialize spinlocks
10350 * are they aren't supposed to be taken by any of the
10351 * NAPI code and this dummy netdev is supposed to be
10352 * only ever used for NAPI polls
10354 memset(dev, 0, sizeof(struct net_device));
10356 /* make sure we BUG if trying to hit standard
10357 * register/unregister code path
10359 dev->reg_state = NETREG_DUMMY;
10361 /* NAPI wants this */
10362 INIT_LIST_HEAD(&dev->napi_list);
10364 /* a dummy interface is started by default */
10365 set_bit(__LINK_STATE_PRESENT, &dev->state);
10366 set_bit(__LINK_STATE_START, &dev->state);
10368 /* napi_busy_loop stats accounting wants this */
10369 dev_net_set(dev, &init_net);
10371 /* Note : We dont allocate pcpu_refcnt for dummy devices,
10372 * because users of this 'device' dont need to change
10378 EXPORT_SYMBOL_GPL(init_dummy_netdev);
10382 * register_netdev - register a network device
10383 * @dev: device to register
10385 * Take a completed network device structure and add it to the kernel
10386 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
10387 * chain. 0 is returned on success. A negative errno code is returned
10388 * on a failure to set up the device, or if the name is a duplicate.
10390 * This is a wrapper around register_netdevice that takes the rtnl semaphore
10391 * and expands the device name if you passed a format string to
10394 int register_netdev(struct net_device *dev)
10398 if (rtnl_lock_killable())
10400 err = register_netdevice(dev);
10404 EXPORT_SYMBOL(register_netdev);
10406 int netdev_refcnt_read(const struct net_device *dev)
10408 #ifdef CONFIG_PCPU_DEV_REFCNT
10411 for_each_possible_cpu(i)
10412 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
10415 return refcount_read(&dev->dev_refcnt);
10418 EXPORT_SYMBOL(netdev_refcnt_read);
10420 int netdev_unregister_timeout_secs __read_mostly = 10;
10422 #define WAIT_REFS_MIN_MSECS 1
10423 #define WAIT_REFS_MAX_MSECS 250
10425 * netdev_wait_allrefs_any - wait until all references are gone.
10426 * @list: list of net_devices to wait on
10428 * This is called when unregistering network devices.
10430 * Any protocol or device that holds a reference should register
10431 * for netdevice notification, and cleanup and put back the
10432 * reference if they receive an UNREGISTER event.
10433 * We can get stuck here if buggy protocols don't correctly
10436 static struct net_device *netdev_wait_allrefs_any(struct list_head *list)
10438 unsigned long rebroadcast_time, warning_time;
10439 struct net_device *dev;
10442 rebroadcast_time = warning_time = jiffies;
10444 list_for_each_entry(dev, list, todo_list)
10445 if (netdev_refcnt_read(dev) == 1)
10449 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
10452 /* Rebroadcast unregister notification */
10453 list_for_each_entry(dev, list, todo_list)
10454 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
10460 list_for_each_entry(dev, list, todo_list)
10461 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
10463 /* We must not have linkwatch events
10464 * pending on unregister. If this
10465 * happens, we simply run the queue
10466 * unscheduled, resulting in a noop
10469 linkwatch_run_queue();
10475 rebroadcast_time = jiffies;
10480 wait = WAIT_REFS_MIN_MSECS;
10483 wait = min(wait << 1, WAIT_REFS_MAX_MSECS);
10486 list_for_each_entry(dev, list, todo_list)
10487 if (netdev_refcnt_read(dev) == 1)
10490 if (time_after(jiffies, warning_time +
10491 READ_ONCE(netdev_unregister_timeout_secs) * HZ)) {
10492 list_for_each_entry(dev, list, todo_list) {
10493 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
10494 dev->name, netdev_refcnt_read(dev));
10495 ref_tracker_dir_print(&dev->refcnt_tracker, 10);
10498 warning_time = jiffies;
10503 /* The sequence is:
10507 * register_netdevice(x1);
10508 * register_netdevice(x2);
10510 * unregister_netdevice(y1);
10511 * unregister_netdevice(y2);
10517 * We are invoked by rtnl_unlock().
10518 * This allows us to deal with problems:
10519 * 1) We can delete sysfs objects which invoke hotplug
10520 * without deadlocking with linkwatch via keventd.
10521 * 2) Since we run with the RTNL semaphore not held, we can sleep
10522 * safely in order to wait for the netdev refcnt to drop to zero.
10524 * We must not return until all unregister events added during
10525 * the interval the lock was held have been completed.
10527 void netdev_run_todo(void)
10529 struct net_device *dev, *tmp;
10530 struct list_head list;
10531 #ifdef CONFIG_LOCKDEP
10532 struct list_head unlink_list;
10534 list_replace_init(&net_unlink_list, &unlink_list);
10536 while (!list_empty(&unlink_list)) {
10537 struct net_device *dev = list_first_entry(&unlink_list,
10540 list_del_init(&dev->unlink_list);
10541 dev->nested_level = dev->lower_level - 1;
10545 /* Snapshot list, allow later requests */
10546 list_replace_init(&net_todo_list, &list);
10550 /* Wait for rcu callbacks to finish before next phase */
10551 if (!list_empty(&list))
10554 list_for_each_entry_safe(dev, tmp, &list, todo_list) {
10555 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
10556 netdev_WARN(dev, "run_todo but not unregistering\n");
10557 list_del(&dev->todo_list);
10561 write_lock(&dev_base_lock);
10562 dev->reg_state = NETREG_UNREGISTERED;
10563 write_unlock(&dev_base_lock);
10564 linkwatch_sync_dev(dev);
10567 while (!list_empty(&list)) {
10568 dev = netdev_wait_allrefs_any(&list);
10569 list_del(&dev->todo_list);
10572 BUG_ON(netdev_refcnt_read(dev) != 1);
10573 BUG_ON(!list_empty(&dev->ptype_all));
10574 BUG_ON(!list_empty(&dev->ptype_specific));
10575 WARN_ON(rcu_access_pointer(dev->ip_ptr));
10576 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
10578 netdev_do_free_pcpu_stats(dev);
10579 if (dev->priv_destructor)
10580 dev->priv_destructor(dev);
10581 if (dev->needs_free_netdev)
10584 if (atomic_dec_and_test(&dev_net(dev)->dev_unreg_count))
10585 wake_up(&netdev_unregistering_wq);
10587 /* Free network device */
10588 kobject_put(&dev->dev.kobj);
10592 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
10593 * all the same fields in the same order as net_device_stats, with only
10594 * the type differing, but rtnl_link_stats64 may have additional fields
10595 * at the end for newer counters.
10597 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
10598 const struct net_device_stats *netdev_stats)
10600 size_t i, n = sizeof(*netdev_stats) / sizeof(atomic_long_t);
10601 const atomic_long_t *src = (atomic_long_t *)netdev_stats;
10602 u64 *dst = (u64 *)stats64;
10604 BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
10605 for (i = 0; i < n; i++)
10606 dst[i] = (unsigned long)atomic_long_read(&src[i]);
10607 /* zero out counters that only exist in rtnl_link_stats64 */
10608 memset((char *)stats64 + n * sizeof(u64), 0,
10609 sizeof(*stats64) - n * sizeof(u64));
10611 EXPORT_SYMBOL(netdev_stats_to_stats64);
10613 static __cold struct net_device_core_stats __percpu *netdev_core_stats_alloc(
10614 struct net_device *dev)
10616 struct net_device_core_stats __percpu *p;
10618 p = alloc_percpu_gfp(struct net_device_core_stats,
10619 GFP_ATOMIC | __GFP_NOWARN);
10621 if (p && cmpxchg(&dev->core_stats, NULL, p))
10624 /* This READ_ONCE() pairs with the cmpxchg() above */
10625 return READ_ONCE(dev->core_stats);
10628 noinline void netdev_core_stats_inc(struct net_device *dev, u32 offset)
10630 /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */
10631 struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats);
10632 unsigned long __percpu *field;
10634 if (unlikely(!p)) {
10635 p = netdev_core_stats_alloc(dev);
10640 field = (__force unsigned long __percpu *)((__force void *)p + offset);
10641 this_cpu_inc(*field);
10643 EXPORT_SYMBOL_GPL(netdev_core_stats_inc);
10646 * dev_get_stats - get network device statistics
10647 * @dev: device to get statistics from
10648 * @storage: place to store stats
10650 * Get network statistics from device. Return @storage.
10651 * The device driver may provide its own method by setting
10652 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
10653 * otherwise the internal statistics structure is used.
10655 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
10656 struct rtnl_link_stats64 *storage)
10658 const struct net_device_ops *ops = dev->netdev_ops;
10659 const struct net_device_core_stats __percpu *p;
10661 if (ops->ndo_get_stats64) {
10662 memset(storage, 0, sizeof(*storage));
10663 ops->ndo_get_stats64(dev, storage);
10664 } else if (ops->ndo_get_stats) {
10665 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
10667 netdev_stats_to_stats64(storage, &dev->stats);
10670 /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */
10671 p = READ_ONCE(dev->core_stats);
10673 const struct net_device_core_stats *core_stats;
10676 for_each_possible_cpu(i) {
10677 core_stats = per_cpu_ptr(p, i);
10678 storage->rx_dropped += READ_ONCE(core_stats->rx_dropped);
10679 storage->tx_dropped += READ_ONCE(core_stats->tx_dropped);
10680 storage->rx_nohandler += READ_ONCE(core_stats->rx_nohandler);
10681 storage->rx_otherhost_dropped += READ_ONCE(core_stats->rx_otherhost_dropped);
10686 EXPORT_SYMBOL(dev_get_stats);
10689 * dev_fetch_sw_netstats - get per-cpu network device statistics
10690 * @s: place to store stats
10691 * @netstats: per-cpu network stats to read from
10693 * Read per-cpu network statistics and populate the related fields in @s.
10695 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
10696 const struct pcpu_sw_netstats __percpu *netstats)
10700 for_each_possible_cpu(cpu) {
10701 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
10702 const struct pcpu_sw_netstats *stats;
10703 unsigned int start;
10705 stats = per_cpu_ptr(netstats, cpu);
10707 start = u64_stats_fetch_begin(&stats->syncp);
10708 rx_packets = u64_stats_read(&stats->rx_packets);
10709 rx_bytes = u64_stats_read(&stats->rx_bytes);
10710 tx_packets = u64_stats_read(&stats->tx_packets);
10711 tx_bytes = u64_stats_read(&stats->tx_bytes);
10712 } while (u64_stats_fetch_retry(&stats->syncp, start));
10714 s->rx_packets += rx_packets;
10715 s->rx_bytes += rx_bytes;
10716 s->tx_packets += tx_packets;
10717 s->tx_bytes += tx_bytes;
10720 EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats);
10723 * dev_get_tstats64 - ndo_get_stats64 implementation
10724 * @dev: device to get statistics from
10725 * @s: place to store stats
10727 * Populate @s from dev->stats and dev->tstats. Can be used as
10728 * ndo_get_stats64() callback.
10730 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s)
10732 netdev_stats_to_stats64(s, &dev->stats);
10733 dev_fetch_sw_netstats(s, dev->tstats);
10735 EXPORT_SYMBOL_GPL(dev_get_tstats64);
10737 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
10739 struct netdev_queue *queue = dev_ingress_queue(dev);
10741 #ifdef CONFIG_NET_CLS_ACT
10744 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
10747 netdev_init_one_queue(dev, queue, NULL);
10748 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
10749 RCU_INIT_POINTER(queue->qdisc_sleeping, &noop_qdisc);
10750 rcu_assign_pointer(dev->ingress_queue, queue);
10755 static const struct ethtool_ops default_ethtool_ops;
10757 void netdev_set_default_ethtool_ops(struct net_device *dev,
10758 const struct ethtool_ops *ops)
10760 if (dev->ethtool_ops == &default_ethtool_ops)
10761 dev->ethtool_ops = ops;
10763 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
10766 * netdev_sw_irq_coalesce_default_on() - enable SW IRQ coalescing by default
10767 * @dev: netdev to enable the IRQ coalescing on
10769 * Sets a conservative default for SW IRQ coalescing. Users can use
10770 * sysfs attributes to override the default values.
10772 void netdev_sw_irq_coalesce_default_on(struct net_device *dev)
10774 WARN_ON(dev->reg_state == NETREG_REGISTERED);
10776 if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
10777 dev->gro_flush_timeout = 20000;
10778 dev->napi_defer_hard_irqs = 1;
10781 EXPORT_SYMBOL_GPL(netdev_sw_irq_coalesce_default_on);
10783 void netdev_freemem(struct net_device *dev)
10785 char *addr = (char *)dev - dev->padded;
10791 * alloc_netdev_mqs - allocate network device
10792 * @sizeof_priv: size of private data to allocate space for
10793 * @name: device name format string
10794 * @name_assign_type: origin of device name
10795 * @setup: callback to initialize device
10796 * @txqs: the number of TX subqueues to allocate
10797 * @rxqs: the number of RX subqueues to allocate
10799 * Allocates a struct net_device with private data area for driver use
10800 * and performs basic initialization. Also allocates subqueue structs
10801 * for each queue on the device.
10803 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
10804 unsigned char name_assign_type,
10805 void (*setup)(struct net_device *),
10806 unsigned int txqs, unsigned int rxqs)
10808 struct net_device *dev;
10809 unsigned int alloc_size;
10810 struct net_device *p;
10812 BUG_ON(strlen(name) >= sizeof(dev->name));
10815 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
10820 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
10824 alloc_size = sizeof(struct net_device);
10826 /* ensure 32-byte alignment of private area */
10827 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
10828 alloc_size += sizeof_priv;
10830 /* ensure 32-byte alignment of whole construct */
10831 alloc_size += NETDEV_ALIGN - 1;
10833 p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
10837 dev = PTR_ALIGN(p, NETDEV_ALIGN);
10838 dev->padded = (char *)dev - (char *)p;
10840 ref_tracker_dir_init(&dev->refcnt_tracker, 128, name);
10841 #ifdef CONFIG_PCPU_DEV_REFCNT
10842 dev->pcpu_refcnt = alloc_percpu(int);
10843 if (!dev->pcpu_refcnt)
10847 refcount_set(&dev->dev_refcnt, 1);
10850 if (dev_addr_init(dev))
10856 dev_net_set(dev, &init_net);
10858 dev->gso_max_size = GSO_LEGACY_MAX_SIZE;
10859 dev->xdp_zc_max_segs = 1;
10860 dev->gso_max_segs = GSO_MAX_SEGS;
10861 dev->gro_max_size = GRO_LEGACY_MAX_SIZE;
10862 dev->gso_ipv4_max_size = GSO_LEGACY_MAX_SIZE;
10863 dev->gro_ipv4_max_size = GRO_LEGACY_MAX_SIZE;
10864 dev->tso_max_size = TSO_LEGACY_MAX_SIZE;
10865 dev->tso_max_segs = TSO_MAX_SEGS;
10866 dev->upper_level = 1;
10867 dev->lower_level = 1;
10868 #ifdef CONFIG_LOCKDEP
10869 dev->nested_level = 0;
10870 INIT_LIST_HEAD(&dev->unlink_list);
10873 INIT_LIST_HEAD(&dev->napi_list);
10874 INIT_LIST_HEAD(&dev->unreg_list);
10875 INIT_LIST_HEAD(&dev->close_list);
10876 INIT_LIST_HEAD(&dev->link_watch_list);
10877 INIT_LIST_HEAD(&dev->adj_list.upper);
10878 INIT_LIST_HEAD(&dev->adj_list.lower);
10879 INIT_LIST_HEAD(&dev->ptype_all);
10880 INIT_LIST_HEAD(&dev->ptype_specific);
10881 INIT_LIST_HEAD(&dev->net_notifier_list);
10882 #ifdef CONFIG_NET_SCHED
10883 hash_init(dev->qdisc_hash);
10885 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
10888 if (!dev->tx_queue_len) {
10889 dev->priv_flags |= IFF_NO_QUEUE;
10890 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
10893 dev->num_tx_queues = txqs;
10894 dev->real_num_tx_queues = txqs;
10895 if (netif_alloc_netdev_queues(dev))
10898 dev->num_rx_queues = rxqs;
10899 dev->real_num_rx_queues = rxqs;
10900 if (netif_alloc_rx_queues(dev))
10903 strcpy(dev->name, name);
10904 dev->name_assign_type = name_assign_type;
10905 dev->group = INIT_NETDEV_GROUP;
10906 if (!dev->ethtool_ops)
10907 dev->ethtool_ops = &default_ethtool_ops;
10909 nf_hook_netdev_init(dev);
10918 #ifdef CONFIG_PCPU_DEV_REFCNT
10919 free_percpu(dev->pcpu_refcnt);
10922 netdev_freemem(dev);
10925 EXPORT_SYMBOL(alloc_netdev_mqs);
10928 * free_netdev - free network device
10931 * This function does the last stage of destroying an allocated device
10932 * interface. The reference to the device object is released. If this
10933 * is the last reference then it will be freed.Must be called in process
10936 void free_netdev(struct net_device *dev)
10938 struct napi_struct *p, *n;
10942 /* When called immediately after register_netdevice() failed the unwind
10943 * handling may still be dismantling the device. Handle that case by
10944 * deferring the free.
10946 if (dev->reg_state == NETREG_UNREGISTERING) {
10948 dev->needs_free_netdev = true;
10952 netif_free_tx_queues(dev);
10953 netif_free_rx_queues(dev);
10955 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
10957 /* Flush device addresses */
10958 dev_addr_flush(dev);
10960 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
10963 ref_tracker_dir_exit(&dev->refcnt_tracker);
10964 #ifdef CONFIG_PCPU_DEV_REFCNT
10965 free_percpu(dev->pcpu_refcnt);
10966 dev->pcpu_refcnt = NULL;
10968 free_percpu(dev->core_stats);
10969 dev->core_stats = NULL;
10970 free_percpu(dev->xdp_bulkq);
10971 dev->xdp_bulkq = NULL;
10973 /* Compatibility with error handling in drivers */
10974 if (dev->reg_state == NETREG_UNINITIALIZED) {
10975 netdev_freemem(dev);
10979 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
10980 dev->reg_state = NETREG_RELEASED;
10982 /* will free via device release */
10983 put_device(&dev->dev);
10985 EXPORT_SYMBOL(free_netdev);
10988 * synchronize_net - Synchronize with packet receive processing
10990 * Wait for packets currently being received to be done.
10991 * Does not block later packets from starting.
10993 void synchronize_net(void)
10996 if (rtnl_is_locked())
10997 synchronize_rcu_expedited();
11001 EXPORT_SYMBOL(synchronize_net);
11004 * unregister_netdevice_queue - remove device from the kernel
11008 * This function shuts down a device interface and removes it
11009 * from the kernel tables.
11010 * If head not NULL, device is queued to be unregistered later.
11012 * Callers must hold the rtnl semaphore. You may want
11013 * unregister_netdev() instead of this.
11016 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
11021 list_move_tail(&dev->unreg_list, head);
11025 list_add(&dev->unreg_list, &single);
11026 unregister_netdevice_many(&single);
11029 EXPORT_SYMBOL(unregister_netdevice_queue);
11031 void unregister_netdevice_many_notify(struct list_head *head,
11032 u32 portid, const struct nlmsghdr *nlh)
11034 struct net_device *dev, *tmp;
11035 LIST_HEAD(close_head);
11037 BUG_ON(dev_boot_phase);
11040 if (list_empty(head))
11043 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
11044 /* Some devices call without registering
11045 * for initialization unwind. Remove those
11046 * devices and proceed with the remaining.
11048 if (dev->reg_state == NETREG_UNINITIALIZED) {
11049 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
11053 list_del(&dev->unreg_list);
11056 dev->dismantle = true;
11057 BUG_ON(dev->reg_state != NETREG_REGISTERED);
11060 /* If device is running, close it first. */
11061 list_for_each_entry(dev, head, unreg_list)
11062 list_add_tail(&dev->close_list, &close_head);
11063 dev_close_many(&close_head, true);
11065 list_for_each_entry(dev, head, unreg_list) {
11066 /* And unlink it from device chain. */
11067 write_lock(&dev_base_lock);
11068 unlist_netdevice(dev, false);
11069 dev->reg_state = NETREG_UNREGISTERING;
11070 write_unlock(&dev_base_lock);
11072 flush_all_backlogs();
11076 list_for_each_entry(dev, head, unreg_list) {
11077 struct sk_buff *skb = NULL;
11079 /* Shutdown queueing discipline. */
11081 dev_tcx_uninstall(dev);
11082 dev_xdp_uninstall(dev);
11083 bpf_dev_bound_netdev_unregister(dev);
11085 netdev_offload_xstats_disable_all(dev);
11087 /* Notify protocols, that we are about to destroy
11088 * this device. They should clean all the things.
11090 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
11092 if (!dev->rtnl_link_ops ||
11093 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
11094 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0,
11095 GFP_KERNEL, NULL, 0,
11099 * Flush the unicast and multicast chains
11104 netdev_name_node_alt_flush(dev);
11105 netdev_name_node_free(dev->name_node);
11107 call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);
11109 if (dev->netdev_ops->ndo_uninit)
11110 dev->netdev_ops->ndo_uninit(dev);
11113 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL, portid, nlh);
11115 /* Notifier chain MUST detach us all upper devices. */
11116 WARN_ON(netdev_has_any_upper_dev(dev));
11117 WARN_ON(netdev_has_any_lower_dev(dev));
11119 /* Remove entries from kobject tree */
11120 netdev_unregister_kobject(dev);
11122 /* Remove XPS queueing entries */
11123 netif_reset_xps_queues_gt(dev, 0);
11129 list_for_each_entry(dev, head, unreg_list) {
11130 netdev_put(dev, &dev->dev_registered_tracker);
11138 * unregister_netdevice_many - unregister many devices
11139 * @head: list of devices
11141 * Note: As most callers use a stack allocated list_head,
11142 * we force a list_del() to make sure stack wont be corrupted later.
11144 void unregister_netdevice_many(struct list_head *head)
11146 unregister_netdevice_many_notify(head, 0, NULL);
11148 EXPORT_SYMBOL(unregister_netdevice_many);
11151 * unregister_netdev - remove device from the kernel
11154 * This function shuts down a device interface and removes it
11155 * from the kernel tables.
11157 * This is just a wrapper for unregister_netdevice that takes
11158 * the rtnl semaphore. In general you want to use this and not
11159 * unregister_netdevice.
11161 void unregister_netdev(struct net_device *dev)
11164 unregister_netdevice(dev);
11167 EXPORT_SYMBOL(unregister_netdev);
11170 * __dev_change_net_namespace - move device to different nethost namespace
11172 * @net: network namespace
11173 * @pat: If not NULL name pattern to try if the current device name
11174 * is already taken in the destination network namespace.
11175 * @new_ifindex: If not zero, specifies device index in the target
11178 * This function shuts down a device interface and moves it
11179 * to a new network namespace. On success 0 is returned, on
11180 * a failure a netagive errno code is returned.
11182 * Callers must hold the rtnl semaphore.
11185 int __dev_change_net_namespace(struct net_device *dev, struct net *net,
11186 const char *pat, int new_ifindex)
11188 struct netdev_name_node *name_node;
11189 struct net *net_old = dev_net(dev);
11190 char new_name[IFNAMSIZ] = {};
11195 /* Don't allow namespace local devices to be moved. */
11197 if (dev->features & NETIF_F_NETNS_LOCAL)
11200 /* Ensure the device has been registrered */
11201 if (dev->reg_state != NETREG_REGISTERED)
11204 /* Get out if there is nothing todo */
11206 if (net_eq(net_old, net))
11209 /* Pick the destination device name, and ensure
11210 * we can use it in the destination network namespace.
11213 if (netdev_name_in_use(net, dev->name)) {
11214 /* We get here if we can't use the current device name */
11217 err = dev_prep_valid_name(net, dev, pat, new_name, EEXIST);
11221 /* Check that none of the altnames conflicts. */
11223 netdev_for_each_altname(dev, name_node)
11224 if (netdev_name_in_use(net, name_node->name))
11227 /* Check that new_ifindex isn't used yet. */
11229 err = dev_index_reserve(net, new_ifindex);
11233 /* If there is an ifindex conflict assign a new one */
11234 err = dev_index_reserve(net, dev->ifindex);
11236 err = dev_index_reserve(net, 0);
11243 * And now a mini version of register_netdevice unregister_netdevice.
11246 /* If device is running close it first. */
11249 /* And unlink it from device chain */
11250 unlist_netdevice(dev, true);
11254 /* Shutdown queueing discipline. */
11257 /* Notify protocols, that we are about to destroy
11258 * this device. They should clean all the things.
11260 * Note that dev->reg_state stays at NETREG_REGISTERED.
11261 * This is wanted because this way 8021q and macvlan know
11262 * the device is just moving and can keep their slaves up.
11264 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
11267 new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL);
11269 rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid,
11273 * Flush the unicast and multicast chains
11278 /* Send a netdev-removed uevent to the old namespace */
11279 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
11280 netdev_adjacent_del_links(dev);
11282 /* Move per-net netdevice notifiers that are following the netdevice */
11283 move_netdevice_notifiers_dev_net(dev, net);
11285 /* Actually switch the network namespace */
11286 dev_net_set(dev, net);
11287 dev->ifindex = new_ifindex;
11289 if (new_name[0]) /* Rename the netdev to prepared name */
11290 strscpy(dev->name, new_name, IFNAMSIZ);
11292 /* Fixup kobjects */
11293 dev_set_uevent_suppress(&dev->dev, 1);
11294 err = device_rename(&dev->dev, dev->name);
11295 dev_set_uevent_suppress(&dev->dev, 0);
11298 /* Send a netdev-add uevent to the new namespace */
11299 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
11300 netdev_adjacent_add_links(dev);
11302 /* Adapt owner in case owning user namespace of target network
11303 * namespace is different from the original one.
11305 err = netdev_change_owner(dev, net_old, net);
11308 /* Add the device back in the hashes */
11309 list_netdevice(dev);
11311 /* Notify protocols, that a new device appeared. */
11312 call_netdevice_notifiers(NETDEV_REGISTER, dev);
11315 * Prevent userspace races by waiting until the network
11316 * device is fully setup before sending notifications.
11318 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL);
11325 EXPORT_SYMBOL_GPL(__dev_change_net_namespace);
11327 static int dev_cpu_dead(unsigned int oldcpu)
11329 struct sk_buff **list_skb;
11330 struct sk_buff *skb;
11332 struct softnet_data *sd, *oldsd, *remsd = NULL;
11334 local_irq_disable();
11335 cpu = smp_processor_id();
11336 sd = &per_cpu(softnet_data, cpu);
11337 oldsd = &per_cpu(softnet_data, oldcpu);
11339 /* Find end of our completion_queue. */
11340 list_skb = &sd->completion_queue;
11342 list_skb = &(*list_skb)->next;
11343 /* Append completion queue from offline CPU. */
11344 *list_skb = oldsd->completion_queue;
11345 oldsd->completion_queue = NULL;
11347 /* Append output queue from offline CPU. */
11348 if (oldsd->output_queue) {
11349 *sd->output_queue_tailp = oldsd->output_queue;
11350 sd->output_queue_tailp = oldsd->output_queue_tailp;
11351 oldsd->output_queue = NULL;
11352 oldsd->output_queue_tailp = &oldsd->output_queue;
11354 /* Append NAPI poll list from offline CPU, with one exception :
11355 * process_backlog() must be called by cpu owning percpu backlog.
11356 * We properly handle process_queue & input_pkt_queue later.
11358 while (!list_empty(&oldsd->poll_list)) {
11359 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
11360 struct napi_struct,
11363 list_del_init(&napi->poll_list);
11364 if (napi->poll == process_backlog)
11367 ____napi_schedule(sd, napi);
11370 raise_softirq_irqoff(NET_TX_SOFTIRQ);
11371 local_irq_enable();
11374 remsd = oldsd->rps_ipi_list;
11375 oldsd->rps_ipi_list = NULL;
11377 /* send out pending IPI's on offline CPU */
11378 net_rps_send_ipi(remsd);
11380 /* Process offline CPU's input_pkt_queue */
11381 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
11383 input_queue_head_incr(oldsd);
11385 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
11387 input_queue_head_incr(oldsd);
11394 * netdev_increment_features - increment feature set by one
11395 * @all: current feature set
11396 * @one: new feature set
11397 * @mask: mask feature set
11399 * Computes a new feature set after adding a device with feature set
11400 * @one to the master device with current feature set @all. Will not
11401 * enable anything that is off in @mask. Returns the new feature set.
11403 netdev_features_t netdev_increment_features(netdev_features_t all,
11404 netdev_features_t one, netdev_features_t mask)
11406 if (mask & NETIF_F_HW_CSUM)
11407 mask |= NETIF_F_CSUM_MASK;
11408 mask |= NETIF_F_VLAN_CHALLENGED;
11410 all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask;
11411 all &= one | ~NETIF_F_ALL_FOR_ALL;
11413 /* If one device supports hw checksumming, set for all. */
11414 if (all & NETIF_F_HW_CSUM)
11415 all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);
11419 EXPORT_SYMBOL(netdev_increment_features);
11421 static struct hlist_head * __net_init netdev_create_hash(void)
11424 struct hlist_head *hash;
11426 hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL);
11428 for (i = 0; i < NETDEV_HASHENTRIES; i++)
11429 INIT_HLIST_HEAD(&hash[i]);
11434 /* Initialize per network namespace state */
11435 static int __net_init netdev_init(struct net *net)
11437 BUILD_BUG_ON(GRO_HASH_BUCKETS >
11438 8 * sizeof_field(struct napi_struct, gro_bitmask));
11440 INIT_LIST_HEAD(&net->dev_base_head);
11442 net->dev_name_head = netdev_create_hash();
11443 if (net->dev_name_head == NULL)
11446 net->dev_index_head = netdev_create_hash();
11447 if (net->dev_index_head == NULL)
11450 xa_init_flags(&net->dev_by_index, XA_FLAGS_ALLOC1);
11452 RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain);
11457 kfree(net->dev_name_head);
11463 * netdev_drivername - network driver for the device
11464 * @dev: network device
11466 * Determine network driver for device.
11468 const char *netdev_drivername(const struct net_device *dev)
11470 const struct device_driver *driver;
11471 const struct device *parent;
11472 const char *empty = "";
11474 parent = dev->dev.parent;
11478 driver = parent->driver;
11479 if (driver && driver->name)
11480 return driver->name;
11484 static void __netdev_printk(const char *level, const struct net_device *dev,
11485 struct va_format *vaf)
11487 if (dev && dev->dev.parent) {
11488 dev_printk_emit(level[1] - '0',
11491 dev_driver_string(dev->dev.parent),
11492 dev_name(dev->dev.parent),
11493 netdev_name(dev), netdev_reg_state(dev),
11496 printk("%s%s%s: %pV",
11497 level, netdev_name(dev), netdev_reg_state(dev), vaf);
11499 printk("%s(NULL net_device): %pV", level, vaf);
11503 void netdev_printk(const char *level, const struct net_device *dev,
11504 const char *format, ...)
11506 struct va_format vaf;
11509 va_start(args, format);
11514 __netdev_printk(level, dev, &vaf);
11518 EXPORT_SYMBOL(netdev_printk);
11520 #define define_netdev_printk_level(func, level) \
11521 void func(const struct net_device *dev, const char *fmt, ...) \
11523 struct va_format vaf; \
11526 va_start(args, fmt); \
11531 __netdev_printk(level, dev, &vaf); \
11535 EXPORT_SYMBOL(func);
11537 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
11538 define_netdev_printk_level(netdev_alert, KERN_ALERT);
11539 define_netdev_printk_level(netdev_crit, KERN_CRIT);
11540 define_netdev_printk_level(netdev_err, KERN_ERR);
11541 define_netdev_printk_level(netdev_warn, KERN_WARNING);
11542 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
11543 define_netdev_printk_level(netdev_info, KERN_INFO);
11545 static void __net_exit netdev_exit(struct net *net)
11547 kfree(net->dev_name_head);
11548 kfree(net->dev_index_head);
11549 xa_destroy(&net->dev_by_index);
11550 if (net != &init_net)
11551 WARN_ON_ONCE(!list_empty(&net->dev_base_head));
11554 static struct pernet_operations __net_initdata netdev_net_ops = {
11555 .init = netdev_init,
11556 .exit = netdev_exit,
11559 static void __net_exit default_device_exit_net(struct net *net)
11561 struct netdev_name_node *name_node, *tmp;
11562 struct net_device *dev, *aux;
11564 * Push all migratable network devices back to the
11565 * initial network namespace
11568 for_each_netdev_safe(net, dev, aux) {
11570 char fb_name[IFNAMSIZ];
11572 /* Ignore unmoveable devices (i.e. loopback) */
11573 if (dev->features & NETIF_F_NETNS_LOCAL)
11576 /* Leave virtual devices for the generic cleanup */
11577 if (dev->rtnl_link_ops && !dev->rtnl_link_ops->netns_refund)
11580 /* Push remaining network devices to init_net */
11581 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
11582 if (netdev_name_in_use(&init_net, fb_name))
11583 snprintf(fb_name, IFNAMSIZ, "dev%%d");
11585 netdev_for_each_altname_safe(dev, name_node, tmp)
11586 if (netdev_name_in_use(&init_net, name_node->name)) {
11587 netdev_name_node_del(name_node);
11589 __netdev_name_node_alt_destroy(name_node);
11592 err = dev_change_net_namespace(dev, &init_net, fb_name);
11594 pr_emerg("%s: failed to move %s to init_net: %d\n",
11595 __func__, dev->name, err);
11601 static void __net_exit default_device_exit_batch(struct list_head *net_list)
11603 /* At exit all network devices most be removed from a network
11604 * namespace. Do this in the reverse order of registration.
11605 * Do this across as many network namespaces as possible to
11606 * improve batching efficiency.
11608 struct net_device *dev;
11610 LIST_HEAD(dev_kill_list);
11613 list_for_each_entry(net, net_list, exit_list) {
11614 default_device_exit_net(net);
11618 list_for_each_entry(net, net_list, exit_list) {
11619 for_each_netdev_reverse(net, dev) {
11620 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
11621 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
11623 unregister_netdevice_queue(dev, &dev_kill_list);
11626 unregister_netdevice_many(&dev_kill_list);
11630 static struct pernet_operations __net_initdata default_device_ops = {
11631 .exit_batch = default_device_exit_batch,
11634 static void __init net_dev_struct_check(void)
11636 /* TX read-mostly hotpath */
11637 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, priv_flags);
11638 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, netdev_ops);
11639 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, header_ops);
11640 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, _tx);
11641 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, real_num_tx_queues);
11642 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size);
11643 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size);
11644 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs);
11645 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_partial_features);
11646 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc);
11647 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu);
11648 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom);
11649 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tc_to_txq);
11651 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, xps_maps);
11653 #ifdef CONFIG_NETFILTER_EGRESS
11654 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, nf_hooks_egress);
11656 #ifdef CONFIG_NET_XGRESS
11657 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress);
11659 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 160);
11661 /* TXRX read-mostly hotpath */
11662 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, lstats);
11663 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags);
11664 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len);
11665 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features);
11666 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr);
11667 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 38);
11669 /* RX read-mostly hotpath */
11670 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific);
11671 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ifindex);
11672 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, real_num_rx_queues);
11673 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, _rx);
11674 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_flush_timeout);
11675 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, napi_defer_hard_irqs);
11676 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_max_size);
11677 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_ipv4_max_size);
11678 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler);
11679 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler_data);
11680 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, nd_net);
11681 #ifdef CONFIG_NETPOLL
11682 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, npinfo);
11684 #ifdef CONFIG_NET_XGRESS
11685 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, tcx_ingress);
11687 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_rx, 104);
11691 * Initialize the DEV module. At boot time this walks the device list and
11692 * unhooks any devices that fail to initialise (normally hardware not
11693 * present) and leaves us with a valid list of present and active devices.
11698 * This is called single threaded during boot, so no need
11699 * to take the rtnl semaphore.
11701 static int __init net_dev_init(void)
11703 int i, rc = -ENOMEM;
11705 BUG_ON(!dev_boot_phase);
11707 net_dev_struct_check();
11709 if (dev_proc_init())
11712 if (netdev_kobject_init())
11715 INIT_LIST_HEAD(&ptype_all);
11716 for (i = 0; i < PTYPE_HASH_SIZE; i++)
11717 INIT_LIST_HEAD(&ptype_base[i]);
11719 if (register_pernet_subsys(&netdev_net_ops))
11723 * Initialise the packet receive queues.
11726 for_each_possible_cpu(i) {
11727 struct work_struct *flush = per_cpu_ptr(&flush_works, i);
11728 struct softnet_data *sd = &per_cpu(softnet_data, i);
11730 INIT_WORK(flush, flush_backlog);
11732 skb_queue_head_init(&sd->input_pkt_queue);
11733 skb_queue_head_init(&sd->process_queue);
11734 #ifdef CONFIG_XFRM_OFFLOAD
11735 skb_queue_head_init(&sd->xfrm_backlog);
11737 INIT_LIST_HEAD(&sd->poll_list);
11738 sd->output_queue_tailp = &sd->output_queue;
11740 INIT_CSD(&sd->csd, rps_trigger_softirq, sd);
11743 INIT_CSD(&sd->defer_csd, trigger_rx_softirq, sd);
11744 spin_lock_init(&sd->defer_lock);
11746 init_gro_hash(&sd->backlog);
11747 sd->backlog.poll = process_backlog;
11748 sd->backlog.weight = weight_p;
11751 dev_boot_phase = 0;
11753 /* The loopback device is special if any other network devices
11754 * is present in a network namespace the loopback device must
11755 * be present. Since we now dynamically allocate and free the
11756 * loopback device ensure this invariant is maintained by
11757 * keeping the loopback device as the first device on the
11758 * list of network devices. Ensuring the loopback devices
11759 * is the first device that appears and the last network device
11762 if (register_pernet_device(&loopback_net_ops))
11765 if (register_pernet_device(&default_device_ops))
11768 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
11769 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
11771 rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead",
11772 NULL, dev_cpu_dead);
11779 subsys_initcall(net_dev_init);