2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <net/xfrm.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/module.h>
108 #include <linux/netpoll.h>
109 #include <linux/rcupdate.h>
110 #include <linux/delay.h>
111 #include <net/iw_handler.h>
112 #include <asm/current.h>
113 #include <linux/audit.h>
114 #include <linux/dmaengine.h>
115 #include <linux/err.h>
116 #include <linux/ctype.h>
117 #include <linux/if_arp.h>
118 #include <linux/if_vlan.h>
119 #include <linux/ip.h>
121 #include <net/mpls.h>
122 #include <linux/ipv6.h>
123 #include <linux/in.h>
124 #include <linux/jhash.h>
125 #include <linux/random.h>
126 #include <trace/events/napi.h>
127 #include <trace/events/net.h>
128 #include <trace/events/skb.h>
129 #include <linux/pci.h>
130 #include <linux/inetdevice.h>
131 #include <linux/cpu_rmap.h>
132 #include <linux/static_key.h>
133 #include <linux/hashtable.h>
134 #include <linux/vmalloc.h>
135 #include <linux/if_macvlan.h>
136 #include <linux/errqueue.h>
137 #include <linux/hrtimer.h>
138 #include <linux/netfilter_ingress.h>
140 #include "net-sysfs.h"
142 /* Instead of increasing this, you should create a hash table. */
143 #define MAX_GRO_SKBS 8
145 /* This should be increased if a protocol with a bigger head is added. */
146 #define GRO_MAX_HEAD (MAX_HEADER + 128)
148 static DEFINE_SPINLOCK(ptype_lock);
149 static DEFINE_SPINLOCK(offload_lock);
150 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
151 struct list_head ptype_all __read_mostly; /* Taps */
152 static struct list_head offload_base __read_mostly;
154 static int netif_rx_internal(struct sk_buff *skb);
155 static int call_netdevice_notifiers_info(unsigned long val,
156 struct net_device *dev,
157 struct netdev_notifier_info *info);
160 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
163 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
165 * Writers must hold the rtnl semaphore while they loop through the
166 * dev_base_head list, and hold dev_base_lock for writing when they do the
167 * actual updates. This allows pure readers to access the list even
168 * while a writer is preparing to update it.
170 * To put it another way, dev_base_lock is held for writing only to
171 * protect against pure readers; the rtnl semaphore provides the
172 * protection against other writers.
174 * See, for example usages, register_netdevice() and
175 * unregister_netdevice(), which must be called with the rtnl
178 DEFINE_RWLOCK(dev_base_lock);
179 EXPORT_SYMBOL(dev_base_lock);
181 /* protects napi_hash addition/deletion and napi_gen_id */
182 static DEFINE_SPINLOCK(napi_hash_lock);
184 static unsigned int napi_gen_id;
185 static DEFINE_HASHTABLE(napi_hash, 8);
187 static seqcount_t devnet_rename_seq;
189 static inline void dev_base_seq_inc(struct net *net)
191 while (++net->dev_base_seq == 0);
194 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
196 unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
198 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
201 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
203 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
206 static inline void rps_lock(struct softnet_data *sd)
209 spin_lock(&sd->input_pkt_queue.lock);
213 static inline void rps_unlock(struct softnet_data *sd)
216 spin_unlock(&sd->input_pkt_queue.lock);
220 /* Device list insertion */
221 static void list_netdevice(struct net_device *dev)
223 struct net *net = dev_net(dev);
227 write_lock_bh(&dev_base_lock);
228 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
229 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
230 hlist_add_head_rcu(&dev->index_hlist,
231 dev_index_hash(net, dev->ifindex));
232 write_unlock_bh(&dev_base_lock);
234 dev_base_seq_inc(net);
237 /* Device list removal
238 * caller must respect a RCU grace period before freeing/reusing dev
240 static void unlist_netdevice(struct net_device *dev)
244 /* Unlink dev from the device chain */
245 write_lock_bh(&dev_base_lock);
246 list_del_rcu(&dev->dev_list);
247 hlist_del_rcu(&dev->name_hlist);
248 hlist_del_rcu(&dev->index_hlist);
249 write_unlock_bh(&dev_base_lock);
251 dev_base_seq_inc(dev_net(dev));
258 static RAW_NOTIFIER_HEAD(netdev_chain);
261 * Device drivers call our routines to queue packets here. We empty the
262 * queue in the local softnet handler.
265 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
266 EXPORT_PER_CPU_SYMBOL(softnet_data);
268 #ifdef CONFIG_LOCKDEP
270 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
271 * according to dev->type
273 static const unsigned short netdev_lock_type[] =
274 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
275 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
276 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
277 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
278 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
279 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
280 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
281 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
282 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
283 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
284 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
285 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
286 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
287 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
288 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
290 static const char *const netdev_lock_name[] =
291 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
292 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
293 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
294 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
295 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
296 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
297 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
298 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
299 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
300 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
301 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
302 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
303 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
304 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
305 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
307 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
308 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
310 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
314 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
315 if (netdev_lock_type[i] == dev_type)
317 /* the last key is used by default */
318 return ARRAY_SIZE(netdev_lock_type) - 1;
321 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
322 unsigned short dev_type)
326 i = netdev_lock_pos(dev_type);
327 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
328 netdev_lock_name[i]);
331 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
335 i = netdev_lock_pos(dev->type);
336 lockdep_set_class_and_name(&dev->addr_list_lock,
337 &netdev_addr_lock_key[i],
338 netdev_lock_name[i]);
341 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
342 unsigned short dev_type)
345 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
350 /*******************************************************************************
352 Protocol management and registration routines
354 *******************************************************************************/
357 * Add a protocol ID to the list. Now that the input handler is
358 * smarter we can dispense with all the messy stuff that used to be
361 * BEWARE!!! Protocol handlers, mangling input packets,
362 * MUST BE last in hash buckets and checking protocol handlers
363 * MUST start from promiscuous ptype_all chain in net_bh.
364 * It is true now, do not change it.
365 * Explanation follows: if protocol handler, mangling packet, will
366 * be the first on list, it is not able to sense, that packet
367 * is cloned and should be copied-on-write, so that it will
368 * change it and subsequent readers will get broken packet.
372 static inline struct list_head *ptype_head(const struct packet_type *pt)
374 if (pt->type == htons(ETH_P_ALL))
375 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
377 return pt->dev ? &pt->dev->ptype_specific :
378 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
382 * dev_add_pack - add packet handler
383 * @pt: packet type declaration
385 * Add a protocol handler to the networking stack. The passed &packet_type
386 * is linked into kernel lists and may not be freed until it has been
387 * removed from the kernel lists.
389 * This call does not sleep therefore it can not
390 * guarantee all CPU's that are in middle of receiving packets
391 * will see the new packet type (until the next received packet).
394 void dev_add_pack(struct packet_type *pt)
396 struct list_head *head = ptype_head(pt);
398 spin_lock(&ptype_lock);
399 list_add_rcu(&pt->list, head);
400 spin_unlock(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head = ptype_head(pt);
420 struct packet_type *pt1;
422 spin_lock(&ptype_lock);
424 list_for_each_entry(pt1, head, list) {
426 list_del_rcu(&pt->list);
431 pr_warn("dev_remove_pack: %p not found\n", pt);
433 spin_unlock(&ptype_lock);
435 EXPORT_SYMBOL(__dev_remove_pack);
438 * dev_remove_pack - remove packet handler
439 * @pt: packet type declaration
441 * Remove a protocol handler that was previously added to the kernel
442 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
443 * from the kernel lists and can be freed or reused once this function
446 * This call sleeps to guarantee that no CPU is looking at the packet
449 void dev_remove_pack(struct packet_type *pt)
451 __dev_remove_pack(pt);
455 EXPORT_SYMBOL(dev_remove_pack);
459 * dev_add_offload - register offload handlers
460 * @po: protocol offload declaration
462 * Add protocol offload handlers to the networking stack. The passed
463 * &proto_offload is linked into kernel lists and may not be freed until
464 * it has been removed from the kernel lists.
466 * This call does not sleep therefore it can not
467 * guarantee all CPU's that are in middle of receiving packets
468 * will see the new offload handlers (until the next received packet).
470 void dev_add_offload(struct packet_offload *po)
472 struct packet_offload *elem;
474 spin_lock(&offload_lock);
475 list_for_each_entry(elem, &offload_base, list) {
476 if (po->priority < elem->priority)
479 list_add_rcu(&po->list, elem->list.prev);
480 spin_unlock(&offload_lock);
482 EXPORT_SYMBOL(dev_add_offload);
485 * __dev_remove_offload - remove offload handler
486 * @po: packet offload declaration
488 * Remove a protocol offload handler that was previously added to the
489 * kernel offload handlers by dev_add_offload(). The passed &offload_type
490 * is removed from the kernel lists and can be freed or reused once this
493 * The packet type might still be in use by receivers
494 * and must not be freed until after all the CPU's have gone
495 * through a quiescent state.
497 static void __dev_remove_offload(struct packet_offload *po)
499 struct list_head *head = &offload_base;
500 struct packet_offload *po1;
502 spin_lock(&offload_lock);
504 list_for_each_entry(po1, head, list) {
506 list_del_rcu(&po->list);
511 pr_warn("dev_remove_offload: %p not found\n", po);
513 spin_unlock(&offload_lock);
517 * dev_remove_offload - remove packet offload handler
518 * @po: packet offload declaration
520 * Remove a packet offload handler that was previously added to the kernel
521 * offload handlers by dev_add_offload(). The passed &offload_type is
522 * removed from the kernel lists and can be freed or reused once this
525 * This call sleeps to guarantee that no CPU is looking at the packet
528 void dev_remove_offload(struct packet_offload *po)
530 __dev_remove_offload(po);
534 EXPORT_SYMBOL(dev_remove_offload);
536 /******************************************************************************
538 Device Boot-time Settings Routines
540 *******************************************************************************/
542 /* Boot time configuration table */
543 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
546 * netdev_boot_setup_add - add new setup entry
547 * @name: name of the device
548 * @map: configured settings for the device
550 * Adds new setup entry to the dev_boot_setup list. The function
551 * returns 0 on error and 1 on success. This is a generic routine to
554 static int netdev_boot_setup_add(char *name, struct ifmap *map)
556 struct netdev_boot_setup *s;
560 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
561 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
562 memset(s[i].name, 0, sizeof(s[i].name));
563 strlcpy(s[i].name, name, IFNAMSIZ);
564 memcpy(&s[i].map, map, sizeof(s[i].map));
569 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
573 * netdev_boot_setup_check - check boot time settings
574 * @dev: the netdevice
576 * Check boot time settings for the device.
577 * The found settings are set for the device to be used
578 * later in the device probing.
579 * Returns 0 if no settings found, 1 if they are.
581 int netdev_boot_setup_check(struct net_device *dev)
583 struct netdev_boot_setup *s = dev_boot_setup;
586 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
587 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
588 !strcmp(dev->name, s[i].name)) {
589 dev->irq = s[i].map.irq;
590 dev->base_addr = s[i].map.base_addr;
591 dev->mem_start = s[i].map.mem_start;
592 dev->mem_end = s[i].map.mem_end;
598 EXPORT_SYMBOL(netdev_boot_setup_check);
602 * netdev_boot_base - get address from boot time settings
603 * @prefix: prefix for network device
604 * @unit: id for network device
606 * Check boot time settings for the base address of device.
607 * The found settings are set for the device to be used
608 * later in the device probing.
609 * Returns 0 if no settings found.
611 unsigned long netdev_boot_base(const char *prefix, int unit)
613 const struct netdev_boot_setup *s = dev_boot_setup;
617 sprintf(name, "%s%d", prefix, unit);
620 * If device already registered then return base of 1
621 * to indicate not to probe for this interface
623 if (__dev_get_by_name(&init_net, name))
626 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
627 if (!strcmp(name, s[i].name))
628 return s[i].map.base_addr;
633 * Saves at boot time configured settings for any netdevice.
635 int __init netdev_boot_setup(char *str)
640 str = get_options(str, ARRAY_SIZE(ints), ints);
645 memset(&map, 0, sizeof(map));
649 map.base_addr = ints[2];
651 map.mem_start = ints[3];
653 map.mem_end = ints[4];
655 /* Add new entry to the list */
656 return netdev_boot_setup_add(str, &map);
659 __setup("netdev=", netdev_boot_setup);
661 /*******************************************************************************
663 Device Interface Subroutines
665 *******************************************************************************/
668 * dev_get_iflink - get 'iflink' value of a interface
669 * @dev: targeted interface
671 * Indicates the ifindex the interface is linked to.
672 * Physical interfaces have the same 'ifindex' and 'iflink' values.
675 int dev_get_iflink(const struct net_device *dev)
677 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
678 return dev->netdev_ops->ndo_get_iflink(dev);
682 EXPORT_SYMBOL(dev_get_iflink);
685 * __dev_get_by_name - find a device by its name
686 * @net: the applicable net namespace
687 * @name: name to find
689 * Find an interface by name. Must be called under RTNL semaphore
690 * or @dev_base_lock. If the name is found a pointer to the device
691 * is returned. If the name is not found then %NULL is returned. The
692 * reference counters are not incremented so the caller must be
693 * careful with locks.
696 struct net_device *__dev_get_by_name(struct net *net, const char *name)
698 struct net_device *dev;
699 struct hlist_head *head = dev_name_hash(net, name);
701 hlist_for_each_entry(dev, head, name_hlist)
702 if (!strncmp(dev->name, name, IFNAMSIZ))
707 EXPORT_SYMBOL(__dev_get_by_name);
710 * dev_get_by_name_rcu - find a device by its name
711 * @net: the applicable net namespace
712 * @name: name to find
714 * Find an interface by name.
715 * If the name is found a pointer to the device is returned.
716 * If the name is not found then %NULL is returned.
717 * The reference counters are not incremented so the caller must be
718 * careful with locks. The caller must hold RCU lock.
721 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
723 struct net_device *dev;
724 struct hlist_head *head = dev_name_hash(net, name);
726 hlist_for_each_entry_rcu(dev, head, name_hlist)
727 if (!strncmp(dev->name, name, IFNAMSIZ))
732 EXPORT_SYMBOL(dev_get_by_name_rcu);
735 * dev_get_by_name - find a device by its name
736 * @net: the applicable net namespace
737 * @name: name to find
739 * Find an interface by name. This can be called from any
740 * context and does its own locking. The returned handle has
741 * the usage count incremented and the caller must use dev_put() to
742 * release it when it is no longer needed. %NULL is returned if no
743 * matching device is found.
746 struct net_device *dev_get_by_name(struct net *net, const char *name)
748 struct net_device *dev;
751 dev = dev_get_by_name_rcu(net, name);
757 EXPORT_SYMBOL(dev_get_by_name);
760 * __dev_get_by_index - find a device by its ifindex
761 * @net: the applicable net namespace
762 * @ifindex: index of device
764 * Search for an interface by index. Returns %NULL if the device
765 * is not found or a pointer to the device. The device has not
766 * had its reference counter increased so the caller must be careful
767 * about locking. The caller must hold either the RTNL semaphore
771 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
773 struct net_device *dev;
774 struct hlist_head *head = dev_index_hash(net, ifindex);
776 hlist_for_each_entry(dev, head, index_hlist)
777 if (dev->ifindex == ifindex)
782 EXPORT_SYMBOL(__dev_get_by_index);
785 * dev_get_by_index_rcu - find a device by its ifindex
786 * @net: the applicable net namespace
787 * @ifindex: index of device
789 * Search for an interface by index. Returns %NULL if the device
790 * is not found or a pointer to the device. The device has not
791 * had its reference counter increased so the caller must be careful
792 * about locking. The caller must hold RCU lock.
795 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
797 struct net_device *dev;
798 struct hlist_head *head = dev_index_hash(net, ifindex);
800 hlist_for_each_entry_rcu(dev, head, index_hlist)
801 if (dev->ifindex == ifindex)
806 EXPORT_SYMBOL(dev_get_by_index_rcu);
810 * dev_get_by_index - find a device by its ifindex
811 * @net: the applicable net namespace
812 * @ifindex: index of device
814 * Search for an interface by index. Returns NULL if the device
815 * is not found or a pointer to the device. The device returned has
816 * had a reference added and the pointer is safe until the user calls
817 * dev_put to indicate they have finished with it.
820 struct net_device *dev_get_by_index(struct net *net, int ifindex)
822 struct net_device *dev;
825 dev = dev_get_by_index_rcu(net, ifindex);
831 EXPORT_SYMBOL(dev_get_by_index);
834 * netdev_get_name - get a netdevice name, knowing its ifindex.
835 * @net: network namespace
836 * @name: a pointer to the buffer where the name will be stored.
837 * @ifindex: the ifindex of the interface to get the name from.
839 * The use of raw_seqcount_begin() and cond_resched() before
840 * retrying is required as we want to give the writers a chance
841 * to complete when CONFIG_PREEMPT is not set.
843 int netdev_get_name(struct net *net, char *name, int ifindex)
845 struct net_device *dev;
849 seq = raw_seqcount_begin(&devnet_rename_seq);
851 dev = dev_get_by_index_rcu(net, ifindex);
857 strcpy(name, dev->name);
859 if (read_seqcount_retry(&devnet_rename_seq, seq)) {
868 * dev_getbyhwaddr_rcu - find a device by its hardware address
869 * @net: the applicable net namespace
870 * @type: media type of device
871 * @ha: hardware address
873 * Search for an interface by MAC address. Returns NULL if the device
874 * is not found or a pointer to the device.
875 * The caller must hold RCU or RTNL.
876 * The returned device has not had its ref count increased
877 * and the caller must therefore be careful about locking
881 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
884 struct net_device *dev;
886 for_each_netdev_rcu(net, dev)
887 if (dev->type == type &&
888 !memcmp(dev->dev_addr, ha, dev->addr_len))
893 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
895 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
897 struct net_device *dev;
900 for_each_netdev(net, dev)
901 if (dev->type == type)
906 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
908 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
910 struct net_device *dev, *ret = NULL;
913 for_each_netdev_rcu(net, dev)
914 if (dev->type == type) {
922 EXPORT_SYMBOL(dev_getfirstbyhwtype);
925 * __dev_get_by_flags - find any device with given flags
926 * @net: the applicable net namespace
927 * @if_flags: IFF_* values
928 * @mask: bitmask of bits in if_flags to check
930 * Search for any interface with the given flags. Returns NULL if a device
931 * is not found or a pointer to the device. Must be called inside
932 * rtnl_lock(), and result refcount is unchanged.
935 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
938 struct net_device *dev, *ret;
943 for_each_netdev(net, dev) {
944 if (((dev->flags ^ if_flags) & mask) == 0) {
951 EXPORT_SYMBOL(__dev_get_by_flags);
954 * dev_valid_name - check if name is okay for network device
957 * Network device names need to be valid file names to
958 * to allow sysfs to work. We also disallow any kind of
961 bool dev_valid_name(const char *name)
965 if (strlen(name) >= IFNAMSIZ)
967 if (!strcmp(name, ".") || !strcmp(name, ".."))
971 if (*name == '/' || *name == ':' || isspace(*name))
977 EXPORT_SYMBOL(dev_valid_name);
980 * __dev_alloc_name - allocate a name for a device
981 * @net: network namespace to allocate the device name in
982 * @name: name format string
983 * @buf: scratch buffer and result name string
985 * Passed a format string - eg "lt%d" it will try and find a suitable
986 * id. It scans list of devices to build up a free map, then chooses
987 * the first empty slot. The caller must hold the dev_base or rtnl lock
988 * while allocating the name and adding the device in order to avoid
990 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
991 * Returns the number of the unit assigned or a negative errno code.
994 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
998 const int max_netdevices = 8*PAGE_SIZE;
999 unsigned long *inuse;
1000 struct net_device *d;
1002 p = strnchr(name, IFNAMSIZ-1, '%');
1005 * Verify the string as this thing may have come from
1006 * the user. There must be either one "%d" and no other "%"
1009 if (p[1] != 'd' || strchr(p + 2, '%'))
1012 /* Use one page as a bit array of possible slots */
1013 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
1017 for_each_netdev(net, d) {
1018 if (!sscanf(d->name, name, &i))
1020 if (i < 0 || i >= max_netdevices)
1023 /* avoid cases where sscanf is not exact inverse of printf */
1024 snprintf(buf, IFNAMSIZ, name, i);
1025 if (!strncmp(buf, d->name, IFNAMSIZ))
1029 i = find_first_zero_bit(inuse, max_netdevices);
1030 free_page((unsigned long) inuse);
1034 snprintf(buf, IFNAMSIZ, name, i);
1035 if (!__dev_get_by_name(net, buf))
1038 /* It is possible to run out of possible slots
1039 * when the name is long and there isn't enough space left
1040 * for the digits, or if all bits are used.
1046 * dev_alloc_name - allocate a name for a device
1048 * @name: name format string
1050 * Passed a format string - eg "lt%d" it will try and find a suitable
1051 * id. It scans list of devices to build up a free map, then chooses
1052 * the first empty slot. The caller must hold the dev_base or rtnl lock
1053 * while allocating the name and adding the device in order to avoid
1055 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1056 * Returns the number of the unit assigned or a negative errno code.
1059 int dev_alloc_name(struct net_device *dev, const char *name)
1065 BUG_ON(!dev_net(dev));
1067 ret = __dev_alloc_name(net, name, buf);
1069 strlcpy(dev->name, buf, IFNAMSIZ);
1072 EXPORT_SYMBOL(dev_alloc_name);
1074 static int dev_alloc_name_ns(struct net *net,
1075 struct net_device *dev,
1081 ret = __dev_alloc_name(net, name, buf);
1083 strlcpy(dev->name, buf, IFNAMSIZ);
1087 static int dev_get_valid_name(struct net *net,
1088 struct net_device *dev,
1093 if (!dev_valid_name(name))
1096 if (strchr(name, '%'))
1097 return dev_alloc_name_ns(net, dev, name);
1098 else if (__dev_get_by_name(net, name))
1100 else if (dev->name != name)
1101 strlcpy(dev->name, name, IFNAMSIZ);
1107 * dev_change_name - change name of a device
1109 * @newname: name (or format string) must be at least IFNAMSIZ
1111 * Change name of a device, can pass format strings "eth%d".
1114 int dev_change_name(struct net_device *dev, const char *newname)
1116 unsigned char old_assign_type;
1117 char oldname[IFNAMSIZ];
1123 BUG_ON(!dev_net(dev));
1126 if (dev->flags & IFF_UP)
1129 write_seqcount_begin(&devnet_rename_seq);
1131 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1132 write_seqcount_end(&devnet_rename_seq);
1136 memcpy(oldname, dev->name, IFNAMSIZ);
1138 err = dev_get_valid_name(net, dev, newname);
1140 write_seqcount_end(&devnet_rename_seq);
1144 if (oldname[0] && !strchr(oldname, '%'))
1145 netdev_info(dev, "renamed from %s\n", oldname);
1147 old_assign_type = dev->name_assign_type;
1148 dev->name_assign_type = NET_NAME_RENAMED;
1151 ret = device_rename(&dev->dev, dev->name);
1153 memcpy(dev->name, oldname, IFNAMSIZ);
1154 dev->name_assign_type = old_assign_type;
1155 write_seqcount_end(&devnet_rename_seq);
1159 write_seqcount_end(&devnet_rename_seq);
1161 netdev_adjacent_rename_links(dev, oldname);
1163 write_lock_bh(&dev_base_lock);
1164 hlist_del_rcu(&dev->name_hlist);
1165 write_unlock_bh(&dev_base_lock);
1169 write_lock_bh(&dev_base_lock);
1170 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1171 write_unlock_bh(&dev_base_lock);
1173 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1174 ret = notifier_to_errno(ret);
1177 /* err >= 0 after dev_alloc_name() or stores the first errno */
1180 write_seqcount_begin(&devnet_rename_seq);
1181 memcpy(dev->name, oldname, IFNAMSIZ);
1182 memcpy(oldname, newname, IFNAMSIZ);
1183 dev->name_assign_type = old_assign_type;
1184 old_assign_type = NET_NAME_RENAMED;
1187 pr_err("%s: name change rollback failed: %d\n",
1196 * dev_set_alias - change ifalias of a device
1198 * @alias: name up to IFALIASZ
1199 * @len: limit of bytes to copy from info
1201 * Set ifalias for a device,
1203 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1209 if (len >= IFALIASZ)
1213 kfree(dev->ifalias);
1214 dev->ifalias = NULL;
1218 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1221 dev->ifalias = new_ifalias;
1223 strlcpy(dev->ifalias, alias, len+1);
1229 * netdev_features_change - device changes features
1230 * @dev: device to cause notification
1232 * Called to indicate a device has changed features.
1234 void netdev_features_change(struct net_device *dev)
1236 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1238 EXPORT_SYMBOL(netdev_features_change);
1241 * netdev_state_change - device changes state
1242 * @dev: device to cause notification
1244 * Called to indicate a device has changed state. This function calls
1245 * the notifier chains for netdev_chain and sends a NEWLINK message
1246 * to the routing socket.
1248 void netdev_state_change(struct net_device *dev)
1250 if (dev->flags & IFF_UP) {
1251 struct netdev_notifier_change_info change_info;
1253 change_info.flags_changed = 0;
1254 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
1256 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1259 EXPORT_SYMBOL(netdev_state_change);
1262 * netdev_notify_peers - notify network peers about existence of @dev
1263 * @dev: network device
1265 * Generate traffic such that interested network peers are aware of
1266 * @dev, such as by generating a gratuitous ARP. This may be used when
1267 * a device wants to inform the rest of the network about some sort of
1268 * reconfiguration such as a failover event or virtual machine
1271 void netdev_notify_peers(struct net_device *dev)
1274 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1277 EXPORT_SYMBOL(netdev_notify_peers);
1279 static int __dev_open(struct net_device *dev)
1281 const struct net_device_ops *ops = dev->netdev_ops;
1286 if (!netif_device_present(dev))
1289 /* Block netpoll from trying to do any rx path servicing.
1290 * If we don't do this there is a chance ndo_poll_controller
1291 * or ndo_poll may be running while we open the device
1293 netpoll_poll_disable(dev);
1295 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1296 ret = notifier_to_errno(ret);
1300 set_bit(__LINK_STATE_START, &dev->state);
1302 if (ops->ndo_validate_addr)
1303 ret = ops->ndo_validate_addr(dev);
1305 if (!ret && ops->ndo_open)
1306 ret = ops->ndo_open(dev);
1308 netpoll_poll_enable(dev);
1311 clear_bit(__LINK_STATE_START, &dev->state);
1313 dev->flags |= IFF_UP;
1314 dev_set_rx_mode(dev);
1316 add_device_randomness(dev->dev_addr, dev->addr_len);
1323 * dev_open - prepare an interface for use.
1324 * @dev: device to open
1326 * Takes a device from down to up state. The device's private open
1327 * function is invoked and then the multicast lists are loaded. Finally
1328 * the device is moved into the up state and a %NETDEV_UP message is
1329 * sent to the netdev notifier chain.
1331 * Calling this function on an active interface is a nop. On a failure
1332 * a negative errno code is returned.
1334 int dev_open(struct net_device *dev)
1338 if (dev->flags & IFF_UP)
1341 ret = __dev_open(dev);
1345 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1346 call_netdevice_notifiers(NETDEV_UP, dev);
1350 EXPORT_SYMBOL(dev_open);
1352 static int __dev_close_many(struct list_head *head)
1354 struct net_device *dev;
1359 list_for_each_entry(dev, head, close_list) {
1360 /* Temporarily disable netpoll until the interface is down */
1361 netpoll_poll_disable(dev);
1363 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1365 clear_bit(__LINK_STATE_START, &dev->state);
1367 /* Synchronize to scheduled poll. We cannot touch poll list, it
1368 * can be even on different cpu. So just clear netif_running().
1370 * dev->stop() will invoke napi_disable() on all of it's
1371 * napi_struct instances on this device.
1373 smp_mb__after_atomic(); /* Commit netif_running(). */
1376 dev_deactivate_many(head);
1378 list_for_each_entry(dev, head, close_list) {
1379 const struct net_device_ops *ops = dev->netdev_ops;
1382 * Call the device specific close. This cannot fail.
1383 * Only if device is UP
1385 * We allow it to be called even after a DETACH hot-plug
1391 dev->flags &= ~IFF_UP;
1392 netpoll_poll_enable(dev);
1398 static int __dev_close(struct net_device *dev)
1403 list_add(&dev->close_list, &single);
1404 retval = __dev_close_many(&single);
1410 int dev_close_many(struct list_head *head, bool unlink)
1412 struct net_device *dev, *tmp;
1414 /* Remove the devices that don't need to be closed */
1415 list_for_each_entry_safe(dev, tmp, head, close_list)
1416 if (!(dev->flags & IFF_UP))
1417 list_del_init(&dev->close_list);
1419 __dev_close_many(head);
1421 list_for_each_entry_safe(dev, tmp, head, close_list) {
1422 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1423 call_netdevice_notifiers(NETDEV_DOWN, dev);
1425 list_del_init(&dev->close_list);
1430 EXPORT_SYMBOL(dev_close_many);
1433 * dev_close - shutdown an interface.
1434 * @dev: device to shutdown
1436 * This function moves an active device into down state. A
1437 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1438 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1441 int dev_close(struct net_device *dev)
1443 if (dev->flags & IFF_UP) {
1446 list_add(&dev->close_list, &single);
1447 dev_close_many(&single, true);
1452 EXPORT_SYMBOL(dev_close);
1456 * dev_disable_lro - disable Large Receive Offload on a device
1459 * Disable Large Receive Offload (LRO) on a net device. Must be
1460 * called under RTNL. This is needed if received packets may be
1461 * forwarded to another interface.
1463 void dev_disable_lro(struct net_device *dev)
1465 struct net_device *lower_dev;
1466 struct list_head *iter;
1468 dev->wanted_features &= ~NETIF_F_LRO;
1469 netdev_update_features(dev);
1471 if (unlikely(dev->features & NETIF_F_LRO))
1472 netdev_WARN(dev, "failed to disable LRO!\n");
1474 netdev_for_each_lower_dev(dev, lower_dev, iter)
1475 dev_disable_lro(lower_dev);
1477 EXPORT_SYMBOL(dev_disable_lro);
1479 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1480 struct net_device *dev)
1482 struct netdev_notifier_info info;
1484 netdev_notifier_info_init(&info, dev);
1485 return nb->notifier_call(nb, val, &info);
1488 static int dev_boot_phase = 1;
1491 * register_netdevice_notifier - register a network notifier block
1494 * Register a notifier to be called when network device events occur.
1495 * The notifier passed is linked into the kernel structures and must
1496 * not be reused until it has been unregistered. A negative errno code
1497 * is returned on a failure.
1499 * When registered all registration and up events are replayed
1500 * to the new notifier to allow device to have a race free
1501 * view of the network device list.
1504 int register_netdevice_notifier(struct notifier_block *nb)
1506 struct net_device *dev;
1507 struct net_device *last;
1512 err = raw_notifier_chain_register(&netdev_chain, nb);
1518 for_each_netdev(net, dev) {
1519 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1520 err = notifier_to_errno(err);
1524 if (!(dev->flags & IFF_UP))
1527 call_netdevice_notifier(nb, NETDEV_UP, dev);
1538 for_each_netdev(net, dev) {
1542 if (dev->flags & IFF_UP) {
1543 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1545 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1547 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1552 raw_notifier_chain_unregister(&netdev_chain, nb);
1555 EXPORT_SYMBOL(register_netdevice_notifier);
1558 * unregister_netdevice_notifier - unregister a network notifier block
1561 * Unregister a notifier previously registered by
1562 * register_netdevice_notifier(). The notifier is unlinked into the
1563 * kernel structures and may then be reused. A negative errno code
1564 * is returned on a failure.
1566 * After unregistering unregister and down device events are synthesized
1567 * for all devices on the device list to the removed notifier to remove
1568 * the need for special case cleanup code.
1571 int unregister_netdevice_notifier(struct notifier_block *nb)
1573 struct net_device *dev;
1578 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1583 for_each_netdev(net, dev) {
1584 if (dev->flags & IFF_UP) {
1585 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1587 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1589 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1596 EXPORT_SYMBOL(unregister_netdevice_notifier);
1599 * call_netdevice_notifiers_info - call all network notifier blocks
1600 * @val: value passed unmodified to notifier function
1601 * @dev: net_device pointer passed unmodified to notifier function
1602 * @info: notifier information data
1604 * Call all network notifier blocks. Parameters and return value
1605 * are as for raw_notifier_call_chain().
1608 static int call_netdevice_notifiers_info(unsigned long val,
1609 struct net_device *dev,
1610 struct netdev_notifier_info *info)
1613 netdev_notifier_info_init(info, dev);
1614 return raw_notifier_call_chain(&netdev_chain, val, info);
1618 * call_netdevice_notifiers - call all network notifier blocks
1619 * @val: value passed unmodified to notifier function
1620 * @dev: net_device pointer passed unmodified to notifier function
1622 * Call all network notifier blocks. Parameters and return value
1623 * are as for raw_notifier_call_chain().
1626 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1628 struct netdev_notifier_info info;
1630 return call_netdevice_notifiers_info(val, dev, &info);
1632 EXPORT_SYMBOL(call_netdevice_notifiers);
1634 #ifdef CONFIG_NET_INGRESS
1635 static struct static_key ingress_needed __read_mostly;
1637 void net_inc_ingress_queue(void)
1639 static_key_slow_inc(&ingress_needed);
1641 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
1643 void net_dec_ingress_queue(void)
1645 static_key_slow_dec(&ingress_needed);
1647 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
1650 static struct static_key netstamp_needed __read_mostly;
1651 #ifdef HAVE_JUMP_LABEL
1652 /* We are not allowed to call static_key_slow_dec() from irq context
1653 * If net_disable_timestamp() is called from irq context, defer the
1654 * static_key_slow_dec() calls.
1656 static atomic_t netstamp_needed_deferred;
1659 void net_enable_timestamp(void)
1661 #ifdef HAVE_JUMP_LABEL
1662 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1666 static_key_slow_dec(&netstamp_needed);
1670 static_key_slow_inc(&netstamp_needed);
1672 EXPORT_SYMBOL(net_enable_timestamp);
1674 void net_disable_timestamp(void)
1676 #ifdef HAVE_JUMP_LABEL
1677 if (in_interrupt()) {
1678 atomic_inc(&netstamp_needed_deferred);
1682 static_key_slow_dec(&netstamp_needed);
1684 EXPORT_SYMBOL(net_disable_timestamp);
1686 static inline void net_timestamp_set(struct sk_buff *skb)
1688 skb->tstamp.tv64 = 0;
1689 if (static_key_false(&netstamp_needed))
1690 __net_timestamp(skb);
1693 #define net_timestamp_check(COND, SKB) \
1694 if (static_key_false(&netstamp_needed)) { \
1695 if ((COND) && !(SKB)->tstamp.tv64) \
1696 __net_timestamp(SKB); \
1699 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1703 if (!(dev->flags & IFF_UP))
1706 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1707 if (skb->len <= len)
1710 /* if TSO is enabled, we don't care about the length as the packet
1711 * could be forwarded without being segmented before
1713 if (skb_is_gso(skb))
1718 EXPORT_SYMBOL_GPL(is_skb_forwardable);
1720 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1722 if (skb_orphan_frags(skb, GFP_ATOMIC) ||
1723 unlikely(!is_skb_forwardable(dev, skb))) {
1724 atomic_long_inc(&dev->rx_dropped);
1729 skb_scrub_packet(skb, true);
1731 skb->protocol = eth_type_trans(skb, dev);
1732 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1736 EXPORT_SYMBOL_GPL(__dev_forward_skb);
1739 * dev_forward_skb - loopback an skb to another netif
1741 * @dev: destination network device
1742 * @skb: buffer to forward
1745 * NET_RX_SUCCESS (no congestion)
1746 * NET_RX_DROP (packet was dropped, but freed)
1748 * dev_forward_skb can be used for injecting an skb from the
1749 * start_xmit function of one device into the receive queue
1750 * of another device.
1752 * The receiving device may be in another namespace, so
1753 * we have to clear all information in the skb that could
1754 * impact namespace isolation.
1756 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1758 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
1760 EXPORT_SYMBOL_GPL(dev_forward_skb);
1762 static inline int deliver_skb(struct sk_buff *skb,
1763 struct packet_type *pt_prev,
1764 struct net_device *orig_dev)
1766 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1768 atomic_inc(&skb->users);
1769 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1772 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
1773 struct packet_type **pt,
1774 struct net_device *orig_dev,
1776 struct list_head *ptype_list)
1778 struct packet_type *ptype, *pt_prev = *pt;
1780 list_for_each_entry_rcu(ptype, ptype_list, list) {
1781 if (ptype->type != type)
1784 deliver_skb(skb, pt_prev, orig_dev);
1790 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1792 if (!ptype->af_packet_priv || !skb->sk)
1795 if (ptype->id_match)
1796 return ptype->id_match(ptype, skb->sk);
1797 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1804 * Support routine. Sends outgoing frames to any network
1805 * taps currently in use.
1808 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1810 struct packet_type *ptype;
1811 struct sk_buff *skb2 = NULL;
1812 struct packet_type *pt_prev = NULL;
1813 struct list_head *ptype_list = &ptype_all;
1817 list_for_each_entry_rcu(ptype, ptype_list, list) {
1818 /* Never send packets back to the socket
1819 * they originated from - MvS (miquels@drinkel.ow.org)
1821 if (skb_loop_sk(ptype, skb))
1825 deliver_skb(skb2, pt_prev, skb->dev);
1830 /* need to clone skb, done only once */
1831 skb2 = skb_clone(skb, GFP_ATOMIC);
1835 net_timestamp_set(skb2);
1837 /* skb->nh should be correctly
1838 * set by sender, so that the second statement is
1839 * just protection against buggy protocols.
1841 skb_reset_mac_header(skb2);
1843 if (skb_network_header(skb2) < skb2->data ||
1844 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
1845 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1846 ntohs(skb2->protocol),
1848 skb_reset_network_header(skb2);
1851 skb2->transport_header = skb2->network_header;
1852 skb2->pkt_type = PACKET_OUTGOING;
1856 if (ptype_list == &ptype_all) {
1857 ptype_list = &dev->ptype_all;
1862 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1867 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1868 * @dev: Network device
1869 * @txq: number of queues available
1871 * If real_num_tx_queues is changed the tc mappings may no longer be
1872 * valid. To resolve this verify the tc mapping remains valid and if
1873 * not NULL the mapping. With no priorities mapping to this
1874 * offset/count pair it will no longer be used. In the worst case TC0
1875 * is invalid nothing can be done so disable priority mappings. If is
1876 * expected that drivers will fix this mapping if they can before
1877 * calling netif_set_real_num_tx_queues.
1879 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1882 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1884 /* If TC0 is invalidated disable TC mapping */
1885 if (tc->offset + tc->count > txq) {
1886 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1891 /* Invalidated prio to tc mappings set to TC0 */
1892 for (i = 1; i < TC_BITMASK + 1; i++) {
1893 int q = netdev_get_prio_tc_map(dev, i);
1895 tc = &dev->tc_to_txq[q];
1896 if (tc->offset + tc->count > txq) {
1897 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1899 netdev_set_prio_tc_map(dev, i, 0);
1905 static DEFINE_MUTEX(xps_map_mutex);
1906 #define xmap_dereference(P) \
1907 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1909 static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
1912 struct xps_map *map = NULL;
1916 map = xmap_dereference(dev_maps->cpu_map[cpu]);
1918 for (pos = 0; map && pos < map->len; pos++) {
1919 if (map->queues[pos] == index) {
1921 map->queues[pos] = map->queues[--map->len];
1923 RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL);
1924 kfree_rcu(map, rcu);
1934 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
1936 struct xps_dev_maps *dev_maps;
1938 bool active = false;
1940 mutex_lock(&xps_map_mutex);
1941 dev_maps = xmap_dereference(dev->xps_maps);
1946 for_each_possible_cpu(cpu) {
1947 for (i = index; i < dev->num_tx_queues; i++) {
1948 if (!remove_xps_queue(dev_maps, cpu, i))
1951 if (i == dev->num_tx_queues)
1956 RCU_INIT_POINTER(dev->xps_maps, NULL);
1957 kfree_rcu(dev_maps, rcu);
1960 for (i = index; i < dev->num_tx_queues; i++)
1961 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
1965 mutex_unlock(&xps_map_mutex);
1968 static struct xps_map *expand_xps_map(struct xps_map *map,
1971 struct xps_map *new_map;
1972 int alloc_len = XPS_MIN_MAP_ALLOC;
1975 for (pos = 0; map && pos < map->len; pos++) {
1976 if (map->queues[pos] != index)
1981 /* Need to add queue to this CPU's existing map */
1983 if (pos < map->alloc_len)
1986 alloc_len = map->alloc_len * 2;
1989 /* Need to allocate new map to store queue on this CPU's map */
1990 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
1995 for (i = 0; i < pos; i++)
1996 new_map->queues[i] = map->queues[i];
1997 new_map->alloc_len = alloc_len;
2003 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2006 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
2007 struct xps_map *map, *new_map;
2008 int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES);
2009 int cpu, numa_node_id = -2;
2010 bool active = false;
2012 mutex_lock(&xps_map_mutex);
2014 dev_maps = xmap_dereference(dev->xps_maps);
2016 /* allocate memory for queue storage */
2017 for_each_online_cpu(cpu) {
2018 if (!cpumask_test_cpu(cpu, mask))
2022 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2023 if (!new_dev_maps) {
2024 mutex_unlock(&xps_map_mutex);
2028 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2031 map = expand_xps_map(map, cpu, index);
2035 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2039 goto out_no_new_maps;
2041 for_each_possible_cpu(cpu) {
2042 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
2043 /* add queue to CPU maps */
2046 map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2047 while ((pos < map->len) && (map->queues[pos] != index))
2050 if (pos == map->len)
2051 map->queues[map->len++] = index;
2053 if (numa_node_id == -2)
2054 numa_node_id = cpu_to_node(cpu);
2055 else if (numa_node_id != cpu_to_node(cpu))
2058 } else if (dev_maps) {
2059 /* fill in the new device map from the old device map */
2060 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2061 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2066 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
2068 /* Cleanup old maps */
2070 for_each_possible_cpu(cpu) {
2071 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2072 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2073 if (map && map != new_map)
2074 kfree_rcu(map, rcu);
2077 kfree_rcu(dev_maps, rcu);
2080 dev_maps = new_dev_maps;
2084 /* update Tx queue numa node */
2085 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2086 (numa_node_id >= 0) ? numa_node_id :
2092 /* removes queue from unused CPUs */
2093 for_each_possible_cpu(cpu) {
2094 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu))
2097 if (remove_xps_queue(dev_maps, cpu, index))
2101 /* free map if not active */
2103 RCU_INIT_POINTER(dev->xps_maps, NULL);
2104 kfree_rcu(dev_maps, rcu);
2108 mutex_unlock(&xps_map_mutex);
2112 /* remove any maps that we added */
2113 for_each_possible_cpu(cpu) {
2114 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2115 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2117 if (new_map && new_map != map)
2121 mutex_unlock(&xps_map_mutex);
2123 kfree(new_dev_maps);
2126 EXPORT_SYMBOL(netif_set_xps_queue);
2130 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2131 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2133 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2137 if (txq < 1 || txq > dev->num_tx_queues)
2140 if (dev->reg_state == NETREG_REGISTERED ||
2141 dev->reg_state == NETREG_UNREGISTERING) {
2144 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2150 netif_setup_tc(dev, txq);
2152 if (txq < dev->real_num_tx_queues) {
2153 qdisc_reset_all_tx_gt(dev, txq);
2155 netif_reset_xps_queues_gt(dev, txq);
2160 dev->real_num_tx_queues = txq;
2163 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2167 * netif_set_real_num_rx_queues - set actual number of RX queues used
2168 * @dev: Network device
2169 * @rxq: Actual number of RX queues
2171 * This must be called either with the rtnl_lock held or before
2172 * registration of the net device. Returns 0 on success, or a
2173 * negative error code. If called before registration, it always
2176 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2180 if (rxq < 1 || rxq > dev->num_rx_queues)
2183 if (dev->reg_state == NETREG_REGISTERED) {
2186 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2192 dev->real_num_rx_queues = rxq;
2195 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2199 * netif_get_num_default_rss_queues - default number of RSS queues
2201 * This routine should set an upper limit on the number of RSS queues
2202 * used by default by multiqueue devices.
2204 int netif_get_num_default_rss_queues(void)
2206 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
2208 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
2210 static inline void __netif_reschedule(struct Qdisc *q)
2212 struct softnet_data *sd;
2213 unsigned long flags;
2215 local_irq_save(flags);
2216 sd = this_cpu_ptr(&softnet_data);
2217 q->next_sched = NULL;
2218 *sd->output_queue_tailp = q;
2219 sd->output_queue_tailp = &q->next_sched;
2220 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2221 local_irq_restore(flags);
2224 void __netif_schedule(struct Qdisc *q)
2226 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
2227 __netif_reschedule(q);
2229 EXPORT_SYMBOL(__netif_schedule);
2231 struct dev_kfree_skb_cb {
2232 enum skb_free_reason reason;
2235 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
2237 return (struct dev_kfree_skb_cb *)skb->cb;
2240 void netif_schedule_queue(struct netdev_queue *txq)
2243 if (!(txq->state & QUEUE_STATE_ANY_XOFF)) {
2244 struct Qdisc *q = rcu_dereference(txq->qdisc);
2246 __netif_schedule(q);
2250 EXPORT_SYMBOL(netif_schedule_queue);
2253 * netif_wake_subqueue - allow sending packets on subqueue
2254 * @dev: network device
2255 * @queue_index: sub queue index
2257 * Resume individual transmit queue of a device with multiple transmit queues.
2259 void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2261 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2263 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state)) {
2267 q = rcu_dereference(txq->qdisc);
2268 __netif_schedule(q);
2272 EXPORT_SYMBOL(netif_wake_subqueue);
2274 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
2276 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
2280 q = rcu_dereference(dev_queue->qdisc);
2281 __netif_schedule(q);
2285 EXPORT_SYMBOL(netif_tx_wake_queue);
2287 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
2289 unsigned long flags;
2291 if (likely(atomic_read(&skb->users) == 1)) {
2293 atomic_set(&skb->users, 0);
2294 } else if (likely(!atomic_dec_and_test(&skb->users))) {
2297 get_kfree_skb_cb(skb)->reason = reason;
2298 local_irq_save(flags);
2299 skb->next = __this_cpu_read(softnet_data.completion_queue);
2300 __this_cpu_write(softnet_data.completion_queue, skb);
2301 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2302 local_irq_restore(flags);
2304 EXPORT_SYMBOL(__dev_kfree_skb_irq);
2306 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
2308 if (in_irq() || irqs_disabled())
2309 __dev_kfree_skb_irq(skb, reason);
2313 EXPORT_SYMBOL(__dev_kfree_skb_any);
2317 * netif_device_detach - mark device as removed
2318 * @dev: network device
2320 * Mark device as removed from system and therefore no longer available.
2322 void netif_device_detach(struct net_device *dev)
2324 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
2325 netif_running(dev)) {
2326 netif_tx_stop_all_queues(dev);
2329 EXPORT_SYMBOL(netif_device_detach);
2332 * netif_device_attach - mark device as attached
2333 * @dev: network device
2335 * Mark device as attached from system and restart if needed.
2337 void netif_device_attach(struct net_device *dev)
2339 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2340 netif_running(dev)) {
2341 netif_tx_wake_all_queues(dev);
2342 __netdev_watchdog_up(dev);
2345 EXPORT_SYMBOL(netif_device_attach);
2348 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2349 * to be used as a distribution range.
2351 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
2352 unsigned int num_tx_queues)
2356 u16 qcount = num_tx_queues;
2358 if (skb_rx_queue_recorded(skb)) {
2359 hash = skb_get_rx_queue(skb);
2360 while (unlikely(hash >= num_tx_queues))
2361 hash -= num_tx_queues;
2366 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2367 qoffset = dev->tc_to_txq[tc].offset;
2368 qcount = dev->tc_to_txq[tc].count;
2371 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
2373 EXPORT_SYMBOL(__skb_tx_hash);
2375 static void skb_warn_bad_offload(const struct sk_buff *skb)
2377 static const netdev_features_t null_features = 0;
2378 struct net_device *dev = skb->dev;
2379 const char *driver = "";
2381 if (!net_ratelimit())
2384 if (dev && dev->dev.parent)
2385 driver = dev_driver_string(dev->dev.parent);
2387 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2388 "gso_type=%d ip_summed=%d\n",
2389 driver, dev ? &dev->features : &null_features,
2390 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2391 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2392 skb_shinfo(skb)->gso_type, skb->ip_summed);
2396 * Invalidate hardware checksum when packet is to be mangled, and
2397 * complete checksum manually on outgoing path.
2399 int skb_checksum_help(struct sk_buff *skb)
2402 int ret = 0, offset;
2404 if (skb->ip_summed == CHECKSUM_COMPLETE)
2405 goto out_set_summed;
2407 if (unlikely(skb_shinfo(skb)->gso_size)) {
2408 skb_warn_bad_offload(skb);
2412 /* Before computing a checksum, we should make sure no frag could
2413 * be modified by an external entity : checksum could be wrong.
2415 if (skb_has_shared_frag(skb)) {
2416 ret = __skb_linearize(skb);
2421 offset = skb_checksum_start_offset(skb);
2422 BUG_ON(offset >= skb_headlen(skb));
2423 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2425 offset += skb->csum_offset;
2426 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2428 if (skb_cloned(skb) &&
2429 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2430 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2435 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
2437 skb->ip_summed = CHECKSUM_NONE;
2441 EXPORT_SYMBOL(skb_checksum_help);
2443 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
2445 __be16 type = skb->protocol;
2447 /* Tunnel gso handlers can set protocol to ethernet. */
2448 if (type == htons(ETH_P_TEB)) {
2451 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
2454 eth = (struct ethhdr *)skb_mac_header(skb);
2455 type = eth->h_proto;
2458 return __vlan_get_protocol(skb, type, depth);
2462 * skb_mac_gso_segment - mac layer segmentation handler.
2463 * @skb: buffer to segment
2464 * @features: features for the output path (see dev->features)
2466 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
2467 netdev_features_t features)
2469 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
2470 struct packet_offload *ptype;
2471 int vlan_depth = skb->mac_len;
2472 __be16 type = skb_network_protocol(skb, &vlan_depth);
2474 if (unlikely(!type))
2475 return ERR_PTR(-EINVAL);
2477 __skb_pull(skb, vlan_depth);
2480 list_for_each_entry_rcu(ptype, &offload_base, list) {
2481 if (ptype->type == type && ptype->callbacks.gso_segment) {
2482 segs = ptype->callbacks.gso_segment(skb, features);
2488 __skb_push(skb, skb->data - skb_mac_header(skb));
2492 EXPORT_SYMBOL(skb_mac_gso_segment);
2495 /* openvswitch calls this on rx path, so we need a different check.
2497 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
2500 return skb->ip_summed != CHECKSUM_PARTIAL;
2502 return skb->ip_summed == CHECKSUM_NONE;
2506 * __skb_gso_segment - Perform segmentation on skb.
2507 * @skb: buffer to segment
2508 * @features: features for the output path (see dev->features)
2509 * @tx_path: whether it is called in TX path
2511 * This function segments the given skb and returns a list of segments.
2513 * It may return NULL if the skb requires no segmentation. This is
2514 * only possible when GSO is used for verifying header integrity.
2516 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
2517 netdev_features_t features, bool tx_path)
2519 if (unlikely(skb_needs_check(skb, tx_path))) {
2522 skb_warn_bad_offload(skb);
2524 err = skb_cow_head(skb, 0);
2526 return ERR_PTR(err);
2529 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
2530 SKB_GSO_CB(skb)->encap_level = 0;
2532 skb_reset_mac_header(skb);
2533 skb_reset_mac_len(skb);
2535 return skb_mac_gso_segment(skb, features);
2537 EXPORT_SYMBOL(__skb_gso_segment);
2539 /* Take action when hardware reception checksum errors are detected. */
2541 void netdev_rx_csum_fault(struct net_device *dev)
2543 if (net_ratelimit()) {
2544 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2548 EXPORT_SYMBOL(netdev_rx_csum_fault);
2551 /* Actually, we should eliminate this check as soon as we know, that:
2552 * 1. IOMMU is present and allows to map all the memory.
2553 * 2. No high memory really exists on this machine.
2556 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2558 #ifdef CONFIG_HIGHMEM
2560 if (!(dev->features & NETIF_F_HIGHDMA)) {
2561 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2562 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2563 if (PageHighMem(skb_frag_page(frag)))
2568 if (PCI_DMA_BUS_IS_PHYS) {
2569 struct device *pdev = dev->dev.parent;
2573 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2574 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2575 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2576 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2584 /* If MPLS offload request, verify we are testing hardware MPLS features
2585 * instead of standard features for the netdev.
2587 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2588 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2589 netdev_features_t features,
2592 if (eth_p_mpls(type))
2593 features &= skb->dev->mpls_features;
2598 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2599 netdev_features_t features,
2606 static netdev_features_t harmonize_features(struct sk_buff *skb,
2607 netdev_features_t features)
2612 type = skb_network_protocol(skb, &tmp);
2613 features = net_mpls_features(skb, features, type);
2615 if (skb->ip_summed != CHECKSUM_NONE &&
2616 !can_checksum_protocol(features, type)) {
2617 features &= ~NETIF_F_ALL_CSUM;
2618 } else if (illegal_highdma(skb->dev, skb)) {
2619 features &= ~NETIF_F_SG;
2625 netdev_features_t passthru_features_check(struct sk_buff *skb,
2626 struct net_device *dev,
2627 netdev_features_t features)
2631 EXPORT_SYMBOL(passthru_features_check);
2633 static netdev_features_t dflt_features_check(const struct sk_buff *skb,
2634 struct net_device *dev,
2635 netdev_features_t features)
2637 return vlan_features_check(skb, features);
2640 netdev_features_t netif_skb_features(struct sk_buff *skb)
2642 struct net_device *dev = skb->dev;
2643 netdev_features_t features = dev->features;
2644 u16 gso_segs = skb_shinfo(skb)->gso_segs;
2646 if (gso_segs > dev->gso_max_segs || gso_segs < dev->gso_min_segs)
2647 features &= ~NETIF_F_GSO_MASK;
2649 /* If encapsulation offload request, verify we are testing
2650 * hardware encapsulation features instead of standard
2651 * features for the netdev
2653 if (skb->encapsulation)
2654 features &= dev->hw_enc_features;
2656 if (skb_vlan_tagged(skb))
2657 features = netdev_intersect_features(features,
2658 dev->vlan_features |
2659 NETIF_F_HW_VLAN_CTAG_TX |
2660 NETIF_F_HW_VLAN_STAG_TX);
2662 if (dev->netdev_ops->ndo_features_check)
2663 features &= dev->netdev_ops->ndo_features_check(skb, dev,
2666 features &= dflt_features_check(skb, dev, features);
2668 return harmonize_features(skb, features);
2670 EXPORT_SYMBOL(netif_skb_features);
2672 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
2673 struct netdev_queue *txq, bool more)
2678 if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
2679 dev_queue_xmit_nit(skb, dev);
2682 trace_net_dev_start_xmit(skb, dev);
2683 rc = netdev_start_xmit(skb, dev, txq, more);
2684 trace_net_dev_xmit(skb, rc, dev, len);
2689 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
2690 struct netdev_queue *txq, int *ret)
2692 struct sk_buff *skb = first;
2693 int rc = NETDEV_TX_OK;
2696 struct sk_buff *next = skb->next;
2699 rc = xmit_one(skb, dev, txq, next != NULL);
2700 if (unlikely(!dev_xmit_complete(rc))) {
2706 if (netif_xmit_stopped(txq) && skb) {
2707 rc = NETDEV_TX_BUSY;
2717 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
2718 netdev_features_t features)
2720 if (skb_vlan_tag_present(skb) &&
2721 !vlan_hw_offload_capable(features, skb->vlan_proto))
2722 skb = __vlan_hwaccel_push_inside(skb);
2726 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
2728 netdev_features_t features;
2733 features = netif_skb_features(skb);
2734 skb = validate_xmit_vlan(skb, features);
2738 if (netif_needs_gso(skb, features)) {
2739 struct sk_buff *segs;
2741 segs = skb_gso_segment(skb, features);
2749 if (skb_needs_linearize(skb, features) &&
2750 __skb_linearize(skb))
2753 /* If packet is not checksummed and device does not
2754 * support checksumming for this protocol, complete
2755 * checksumming here.
2757 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2758 if (skb->encapsulation)
2759 skb_set_inner_transport_header(skb,
2760 skb_checksum_start_offset(skb));
2762 skb_set_transport_header(skb,
2763 skb_checksum_start_offset(skb));
2764 if (!(features & NETIF_F_ALL_CSUM) &&
2765 skb_checksum_help(skb))
2778 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev)
2780 struct sk_buff *next, *head = NULL, *tail;
2782 for (; skb != NULL; skb = next) {
2786 /* in case skb wont be segmented, point to itself */
2789 skb = validate_xmit_skb(skb, dev);
2797 /* If skb was segmented, skb->prev points to
2798 * the last segment. If not, it still contains skb.
2805 static void qdisc_pkt_len_init(struct sk_buff *skb)
2807 const struct skb_shared_info *shinfo = skb_shinfo(skb);
2809 qdisc_skb_cb(skb)->pkt_len = skb->len;
2811 /* To get more precise estimation of bytes sent on wire,
2812 * we add to pkt_len the headers size of all segments
2814 if (shinfo->gso_size) {
2815 unsigned int hdr_len;
2816 u16 gso_segs = shinfo->gso_segs;
2818 /* mac layer + network layer */
2819 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
2821 /* + transport layer */
2822 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
2823 hdr_len += tcp_hdrlen(skb);
2825 hdr_len += sizeof(struct udphdr);
2827 if (shinfo->gso_type & SKB_GSO_DODGY)
2828 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
2831 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
2835 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2836 struct net_device *dev,
2837 struct netdev_queue *txq)
2839 spinlock_t *root_lock = qdisc_lock(q);
2843 qdisc_pkt_len_init(skb);
2844 qdisc_calculate_pkt_len(skb, q);
2846 * Heuristic to force contended enqueues to serialize on a
2847 * separate lock before trying to get qdisc main lock.
2848 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2849 * often and dequeue packets faster.
2851 contended = qdisc_is_running(q);
2852 if (unlikely(contended))
2853 spin_lock(&q->busylock);
2855 spin_lock(root_lock);
2856 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2859 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2860 qdisc_run_begin(q)) {
2862 * This is a work-conserving queue; there are no old skbs
2863 * waiting to be sent out; and the qdisc is not running -
2864 * xmit the skb directly.
2867 qdisc_bstats_update(q, skb);
2869 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
2870 if (unlikely(contended)) {
2871 spin_unlock(&q->busylock);
2878 rc = NET_XMIT_SUCCESS;
2880 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2881 if (qdisc_run_begin(q)) {
2882 if (unlikely(contended)) {
2883 spin_unlock(&q->busylock);
2889 spin_unlock(root_lock);
2890 if (unlikely(contended))
2891 spin_unlock(&q->busylock);
2895 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2896 static void skb_update_prio(struct sk_buff *skb)
2898 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2900 if (!skb->priority && skb->sk && map) {
2901 unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
2903 if (prioidx < map->priomap_len)
2904 skb->priority = map->priomap[prioidx];
2908 #define skb_update_prio(skb)
2911 DEFINE_PER_CPU(int, xmit_recursion);
2912 EXPORT_SYMBOL(xmit_recursion);
2914 #define RECURSION_LIMIT 10
2917 * dev_loopback_xmit - loop back @skb
2918 * @skb: buffer to transmit
2920 int dev_loopback_xmit(struct sock *sk, struct sk_buff *skb)
2922 skb_reset_mac_header(skb);
2923 __skb_pull(skb, skb_network_offset(skb));
2924 skb->pkt_type = PACKET_LOOPBACK;
2925 skb->ip_summed = CHECKSUM_UNNECESSARY;
2926 WARN_ON(!skb_dst(skb));
2931 EXPORT_SYMBOL(dev_loopback_xmit);
2933 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2936 struct xps_dev_maps *dev_maps;
2937 struct xps_map *map;
2938 int queue_index = -1;
2941 dev_maps = rcu_dereference(dev->xps_maps);
2943 map = rcu_dereference(
2944 dev_maps->cpu_map[skb->sender_cpu - 1]);
2947 queue_index = map->queues[0];
2949 queue_index = map->queues[reciprocal_scale(skb_get_hash(skb),
2951 if (unlikely(queue_index >= dev->real_num_tx_queues))
2963 static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
2965 struct sock *sk = skb->sk;
2966 int queue_index = sk_tx_queue_get(sk);
2968 if (queue_index < 0 || skb->ooo_okay ||
2969 queue_index >= dev->real_num_tx_queues) {
2970 int new_index = get_xps_queue(dev, skb);
2972 new_index = skb_tx_hash(dev, skb);
2974 if (queue_index != new_index && sk &&
2975 rcu_access_pointer(sk->sk_dst_cache))
2976 sk_tx_queue_set(sk, new_index);
2978 queue_index = new_index;
2984 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
2985 struct sk_buff *skb,
2988 int queue_index = 0;
2991 if (skb->sender_cpu == 0)
2992 skb->sender_cpu = raw_smp_processor_id() + 1;
2995 if (dev->real_num_tx_queues != 1) {
2996 const struct net_device_ops *ops = dev->netdev_ops;
2997 if (ops->ndo_select_queue)
2998 queue_index = ops->ndo_select_queue(dev, skb, accel_priv,
3001 queue_index = __netdev_pick_tx(dev, skb);
3004 queue_index = netdev_cap_txqueue(dev, queue_index);
3007 skb_set_queue_mapping(skb, queue_index);
3008 return netdev_get_tx_queue(dev, queue_index);
3012 * __dev_queue_xmit - transmit a buffer
3013 * @skb: buffer to transmit
3014 * @accel_priv: private data used for L2 forwarding offload
3016 * Queue a buffer for transmission to a network device. The caller must
3017 * have set the device and priority and built the buffer before calling
3018 * this function. The function can be called from an interrupt.
3020 * A negative errno code is returned on a failure. A success does not
3021 * guarantee the frame will be transmitted as it may be dropped due
3022 * to congestion or traffic shaping.
3024 * -----------------------------------------------------------------------------------
3025 * I notice this method can also return errors from the queue disciplines,
3026 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3029 * Regardless of the return value, the skb is consumed, so it is currently
3030 * difficult to retry a send to this method. (You can bump the ref count
3031 * before sending to hold a reference for retry if you are careful.)
3033 * When calling this method, interrupts MUST be enabled. This is because
3034 * the BH enable code must have IRQs enabled so that it will not deadlock.
3037 static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
3039 struct net_device *dev = skb->dev;
3040 struct netdev_queue *txq;
3044 skb_reset_mac_header(skb);
3046 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
3047 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
3049 /* Disable soft irqs for various locks below. Also
3050 * stops preemption for RCU.
3054 skb_update_prio(skb);
3056 /* If device/qdisc don't need skb->dst, release it right now while
3057 * its hot in this cpu cache.
3059 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
3064 txq = netdev_pick_tx(dev, skb, accel_priv);
3065 q = rcu_dereference_bh(txq->qdisc);
3067 #ifdef CONFIG_NET_CLS_ACT
3068 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
3070 trace_net_dev_queue(skb);
3072 rc = __dev_xmit_skb(skb, q, dev, txq);
3076 /* The device has no queue. Common case for software devices:
3077 loopback, all the sorts of tunnels...
3079 Really, it is unlikely that netif_tx_lock protection is necessary
3080 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3082 However, it is possible, that they rely on protection
3085 Check this and shot the lock. It is not prone from deadlocks.
3086 Either shot noqueue qdisc, it is even simpler 8)
3088 if (dev->flags & IFF_UP) {
3089 int cpu = smp_processor_id(); /* ok because BHs are off */
3091 if (txq->xmit_lock_owner != cpu) {
3093 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
3094 goto recursion_alert;
3096 skb = validate_xmit_skb(skb, dev);
3100 HARD_TX_LOCK(dev, txq, cpu);
3102 if (!netif_xmit_stopped(txq)) {
3103 __this_cpu_inc(xmit_recursion);
3104 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
3105 __this_cpu_dec(xmit_recursion);
3106 if (dev_xmit_complete(rc)) {
3107 HARD_TX_UNLOCK(dev, txq);
3111 HARD_TX_UNLOCK(dev, txq);
3112 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3115 /* Recursion is detected! It is possible,
3119 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3126 rcu_read_unlock_bh();
3128 atomic_long_inc(&dev->tx_dropped);
3129 kfree_skb_list(skb);
3132 rcu_read_unlock_bh();
3136 int dev_queue_xmit_sk(struct sock *sk, struct sk_buff *skb)
3138 return __dev_queue_xmit(skb, NULL);
3140 EXPORT_SYMBOL(dev_queue_xmit_sk);
3142 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
3144 return __dev_queue_xmit(skb, accel_priv);
3146 EXPORT_SYMBOL(dev_queue_xmit_accel);
3149 /*=======================================================================
3151 =======================================================================*/
3153 int netdev_max_backlog __read_mostly = 1000;
3154 EXPORT_SYMBOL(netdev_max_backlog);
3156 int netdev_tstamp_prequeue __read_mostly = 1;
3157 int netdev_budget __read_mostly = 300;
3158 int weight_p __read_mostly = 64; /* old backlog weight */
3160 /* Called with irq disabled */
3161 static inline void ____napi_schedule(struct softnet_data *sd,
3162 struct napi_struct *napi)
3164 list_add_tail(&napi->poll_list, &sd->poll_list);
3165 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3170 /* One global table that all flow-based protocols share. */
3171 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
3172 EXPORT_SYMBOL(rps_sock_flow_table);
3173 u32 rps_cpu_mask __read_mostly;
3174 EXPORT_SYMBOL(rps_cpu_mask);
3176 struct static_key rps_needed __read_mostly;
3178 static struct rps_dev_flow *
3179 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3180 struct rps_dev_flow *rflow, u16 next_cpu)
3182 if (next_cpu < nr_cpu_ids) {
3183 #ifdef CONFIG_RFS_ACCEL
3184 struct netdev_rx_queue *rxqueue;
3185 struct rps_dev_flow_table *flow_table;
3186 struct rps_dev_flow *old_rflow;
3191 /* Should we steer this flow to a different hardware queue? */
3192 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
3193 !(dev->features & NETIF_F_NTUPLE))
3195 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
3196 if (rxq_index == skb_get_rx_queue(skb))
3199 rxqueue = dev->_rx + rxq_index;
3200 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3203 flow_id = skb_get_hash(skb) & flow_table->mask;
3204 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
3205 rxq_index, flow_id);
3209 rflow = &flow_table->flows[flow_id];
3211 if (old_rflow->filter == rflow->filter)
3212 old_rflow->filter = RPS_NO_FILTER;
3216 per_cpu(softnet_data, next_cpu).input_queue_head;
3219 rflow->cpu = next_cpu;
3224 * get_rps_cpu is called from netif_receive_skb and returns the target
3225 * CPU from the RPS map of the receiving queue for a given skb.
3226 * rcu_read_lock must be held on entry.
3228 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3229 struct rps_dev_flow **rflowp)
3231 const struct rps_sock_flow_table *sock_flow_table;
3232 struct netdev_rx_queue *rxqueue = dev->_rx;
3233 struct rps_dev_flow_table *flow_table;
3234 struct rps_map *map;
3239 if (skb_rx_queue_recorded(skb)) {
3240 u16 index = skb_get_rx_queue(skb);
3242 if (unlikely(index >= dev->real_num_rx_queues)) {
3243 WARN_ONCE(dev->real_num_rx_queues > 1,
3244 "%s received packet on queue %u, but number "
3245 "of RX queues is %u\n",
3246 dev->name, index, dev->real_num_rx_queues);
3252 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3254 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3255 map = rcu_dereference(rxqueue->rps_map);
3256 if (!flow_table && !map)
3259 skb_reset_network_header(skb);
3260 hash = skb_get_hash(skb);
3264 sock_flow_table = rcu_dereference(rps_sock_flow_table);
3265 if (flow_table && sock_flow_table) {
3266 struct rps_dev_flow *rflow;
3270 /* First check into global flow table if there is a match */
3271 ident = sock_flow_table->ents[hash & sock_flow_table->mask];
3272 if ((ident ^ hash) & ~rps_cpu_mask)
3275 next_cpu = ident & rps_cpu_mask;
3277 /* OK, now we know there is a match,
3278 * we can look at the local (per receive queue) flow table
3280 rflow = &flow_table->flows[hash & flow_table->mask];
3284 * If the desired CPU (where last recvmsg was done) is
3285 * different from current CPU (one in the rx-queue flow
3286 * table entry), switch if one of the following holds:
3287 * - Current CPU is unset (>= nr_cpu_ids).
3288 * - Current CPU is offline.
3289 * - The current CPU's queue tail has advanced beyond the
3290 * last packet that was enqueued using this table entry.
3291 * This guarantees that all previous packets for the flow
3292 * have been dequeued, thus preserving in order delivery.
3294 if (unlikely(tcpu != next_cpu) &&
3295 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
3296 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
3297 rflow->last_qtail)) >= 0)) {
3299 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
3302 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
3312 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
3313 if (cpu_online(tcpu)) {
3323 #ifdef CONFIG_RFS_ACCEL
3326 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3327 * @dev: Device on which the filter was set
3328 * @rxq_index: RX queue index
3329 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3330 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3332 * Drivers that implement ndo_rx_flow_steer() should periodically call
3333 * this function for each installed filter and remove the filters for
3334 * which it returns %true.
3336 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
3337 u32 flow_id, u16 filter_id)
3339 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
3340 struct rps_dev_flow_table *flow_table;
3341 struct rps_dev_flow *rflow;
3346 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3347 if (flow_table && flow_id <= flow_table->mask) {
3348 rflow = &flow_table->flows[flow_id];
3349 cpu = ACCESS_ONCE(rflow->cpu);
3350 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
3351 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
3352 rflow->last_qtail) <
3353 (int)(10 * flow_table->mask)))
3359 EXPORT_SYMBOL(rps_may_expire_flow);
3361 #endif /* CONFIG_RFS_ACCEL */
3363 /* Called from hardirq (IPI) context */
3364 static void rps_trigger_softirq(void *data)
3366 struct softnet_data *sd = data;
3368 ____napi_schedule(sd, &sd->backlog);
3372 #endif /* CONFIG_RPS */
3375 * Check if this softnet_data structure is another cpu one
3376 * If yes, queue it to our IPI list and return 1
3379 static int rps_ipi_queued(struct softnet_data *sd)
3382 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
3385 sd->rps_ipi_next = mysd->rps_ipi_list;
3386 mysd->rps_ipi_list = sd;
3388 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3391 #endif /* CONFIG_RPS */
3395 #ifdef CONFIG_NET_FLOW_LIMIT
3396 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
3399 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
3401 #ifdef CONFIG_NET_FLOW_LIMIT
3402 struct sd_flow_limit *fl;
3403 struct softnet_data *sd;
3404 unsigned int old_flow, new_flow;
3406 if (qlen < (netdev_max_backlog >> 1))
3409 sd = this_cpu_ptr(&softnet_data);
3412 fl = rcu_dereference(sd->flow_limit);
3414 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
3415 old_flow = fl->history[fl->history_head];
3416 fl->history[fl->history_head] = new_flow;
3419 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
3421 if (likely(fl->buckets[old_flow]))
3422 fl->buckets[old_flow]--;
3424 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
3436 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3437 * queue (may be a remote CPU queue).
3439 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
3440 unsigned int *qtail)
3442 struct softnet_data *sd;
3443 unsigned long flags;
3446 sd = &per_cpu(softnet_data, cpu);
3448 local_irq_save(flags);
3451 if (!netif_running(skb->dev))
3453 qlen = skb_queue_len(&sd->input_pkt_queue);
3454 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
3457 __skb_queue_tail(&sd->input_pkt_queue, skb);
3458 input_queue_tail_incr_save(sd, qtail);
3460 local_irq_restore(flags);
3461 return NET_RX_SUCCESS;
3464 /* Schedule NAPI for backlog device
3465 * We can use non atomic operation since we own the queue lock
3467 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
3468 if (!rps_ipi_queued(sd))
3469 ____napi_schedule(sd, &sd->backlog);
3478 local_irq_restore(flags);
3480 atomic_long_inc(&skb->dev->rx_dropped);
3485 static int netif_rx_internal(struct sk_buff *skb)
3489 net_timestamp_check(netdev_tstamp_prequeue, skb);
3491 trace_netif_rx(skb);
3493 if (static_key_false(&rps_needed)) {
3494 struct rps_dev_flow voidflow, *rflow = &voidflow;
3500 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3502 cpu = smp_processor_id();
3504 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3512 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3519 * netif_rx - post buffer to the network code
3520 * @skb: buffer to post
3522 * This function receives a packet from a device driver and queues it for
3523 * the upper (protocol) levels to process. It always succeeds. The buffer
3524 * may be dropped during processing for congestion control or by the
3528 * NET_RX_SUCCESS (no congestion)
3529 * NET_RX_DROP (packet was dropped)
3533 int netif_rx(struct sk_buff *skb)
3535 trace_netif_rx_entry(skb);
3537 return netif_rx_internal(skb);
3539 EXPORT_SYMBOL(netif_rx);
3541 int netif_rx_ni(struct sk_buff *skb)
3545 trace_netif_rx_ni_entry(skb);
3548 err = netif_rx_internal(skb);
3549 if (local_softirq_pending())
3555 EXPORT_SYMBOL(netif_rx_ni);
3557 static void net_tx_action(struct softirq_action *h)
3559 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
3561 if (sd->completion_queue) {
3562 struct sk_buff *clist;
3564 local_irq_disable();
3565 clist = sd->completion_queue;
3566 sd->completion_queue = NULL;
3570 struct sk_buff *skb = clist;
3571 clist = clist->next;
3573 WARN_ON(atomic_read(&skb->users));
3574 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
3575 trace_consume_skb(skb);
3577 trace_kfree_skb(skb, net_tx_action);
3582 if (sd->output_queue) {
3585 local_irq_disable();
3586 head = sd->output_queue;
3587 sd->output_queue = NULL;
3588 sd->output_queue_tailp = &sd->output_queue;
3592 struct Qdisc *q = head;
3593 spinlock_t *root_lock;
3595 head = head->next_sched;
3597 root_lock = qdisc_lock(q);
3598 if (spin_trylock(root_lock)) {
3599 smp_mb__before_atomic();
3600 clear_bit(__QDISC_STATE_SCHED,
3603 spin_unlock(root_lock);
3605 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3607 __netif_reschedule(q);
3609 smp_mb__before_atomic();
3610 clear_bit(__QDISC_STATE_SCHED,
3618 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3619 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3620 /* This hook is defined here for ATM LANE */
3621 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3622 unsigned char *addr) __read_mostly;
3623 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3626 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3627 struct packet_type **pt_prev,
3628 int *ret, struct net_device *orig_dev)
3630 #ifdef CONFIG_NET_CLS_ACT
3631 struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list);
3632 struct tcf_result cl_res;
3634 /* If there's at least one ingress present somewhere (so
3635 * we get here via enabled static key), remaining devices
3636 * that are not configured with an ingress qdisc will bail
3642 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3646 qdisc_skb_cb(skb)->pkt_len = skb->len;
3647 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3648 qdisc_bstats_update_cpu(cl->q, skb);
3650 switch (tc_classify(skb, cl, &cl_res)) {
3652 case TC_ACT_RECLASSIFY:
3653 skb->tc_index = TC_H_MIN(cl_res.classid);
3656 qdisc_qstats_drop_cpu(cl->q);
3664 #endif /* CONFIG_NET_CLS_ACT */
3669 * netdev_rx_handler_register - register receive handler
3670 * @dev: device to register a handler for
3671 * @rx_handler: receive handler to register
3672 * @rx_handler_data: data pointer that is used by rx handler
3674 * Register a receive handler for a device. This handler will then be
3675 * called from __netif_receive_skb. A negative errno code is returned
3678 * The caller must hold the rtnl_mutex.
3680 * For a general description of rx_handler, see enum rx_handler_result.
3682 int netdev_rx_handler_register(struct net_device *dev,
3683 rx_handler_func_t *rx_handler,
3684 void *rx_handler_data)
3688 if (dev->rx_handler)
3691 /* Note: rx_handler_data must be set before rx_handler */
3692 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3693 rcu_assign_pointer(dev->rx_handler, rx_handler);
3697 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3700 * netdev_rx_handler_unregister - unregister receive handler
3701 * @dev: device to unregister a handler from
3703 * Unregister a receive handler from a device.
3705 * The caller must hold the rtnl_mutex.
3707 void netdev_rx_handler_unregister(struct net_device *dev)
3711 RCU_INIT_POINTER(dev->rx_handler, NULL);
3712 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3713 * section has a guarantee to see a non NULL rx_handler_data
3717 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3719 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3722 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3723 * the special handling of PFMEMALLOC skbs.
3725 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
3727 switch (skb->protocol) {
3728 case htons(ETH_P_ARP):
3729 case htons(ETH_P_IP):
3730 case htons(ETH_P_IPV6):
3731 case htons(ETH_P_8021Q):
3732 case htons(ETH_P_8021AD):
3739 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
3740 int *ret, struct net_device *orig_dev)
3742 #ifdef CONFIG_NETFILTER_INGRESS
3743 if (nf_hook_ingress_active(skb)) {
3745 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3749 return nf_hook_ingress(skb);
3751 #endif /* CONFIG_NETFILTER_INGRESS */
3755 static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
3757 struct packet_type *ptype, *pt_prev;
3758 rx_handler_func_t *rx_handler;
3759 struct net_device *orig_dev;
3760 bool deliver_exact = false;
3761 int ret = NET_RX_DROP;
3764 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3766 trace_netif_receive_skb(skb);
3768 orig_dev = skb->dev;
3770 skb_reset_network_header(skb);
3771 if (!skb_transport_header_was_set(skb))
3772 skb_reset_transport_header(skb);
3773 skb_reset_mac_len(skb);
3778 skb->skb_iif = skb->dev->ifindex;
3780 __this_cpu_inc(softnet_data.processed);
3782 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
3783 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
3784 skb = skb_vlan_untag(skb);
3789 #ifdef CONFIG_NET_CLS_ACT
3790 if (skb->tc_verd & TC_NCLS) {
3791 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3799 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3801 ret = deliver_skb(skb, pt_prev, orig_dev);
3805 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
3807 ret = deliver_skb(skb, pt_prev, orig_dev);
3812 #ifdef CONFIG_NET_INGRESS
3813 if (static_key_false(&ingress_needed)) {
3814 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3818 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
3822 #ifdef CONFIG_NET_CLS_ACT
3826 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
3829 if (skb_vlan_tag_present(skb)) {
3831 ret = deliver_skb(skb, pt_prev, orig_dev);
3834 if (vlan_do_receive(&skb))
3836 else if (unlikely(!skb))
3840 rx_handler = rcu_dereference(skb->dev->rx_handler);
3843 ret = deliver_skb(skb, pt_prev, orig_dev);
3846 switch (rx_handler(&skb)) {
3847 case RX_HANDLER_CONSUMED:
3848 ret = NET_RX_SUCCESS;
3850 case RX_HANDLER_ANOTHER:
3852 case RX_HANDLER_EXACT:
3853 deliver_exact = true;
3854 case RX_HANDLER_PASS:
3861 if (unlikely(skb_vlan_tag_present(skb))) {
3862 if (skb_vlan_tag_get_id(skb))
3863 skb->pkt_type = PACKET_OTHERHOST;
3864 /* Note: we might in the future use prio bits
3865 * and set skb->priority like in vlan_do_receive()
3866 * For the time being, just ignore Priority Code Point
3871 type = skb->protocol;
3873 /* deliver only exact match when indicated */
3874 if (likely(!deliver_exact)) {
3875 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
3876 &ptype_base[ntohs(type) &
3880 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
3881 &orig_dev->ptype_specific);
3883 if (unlikely(skb->dev != orig_dev)) {
3884 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
3885 &skb->dev->ptype_specific);
3889 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
3892 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3895 atomic_long_inc(&skb->dev->rx_dropped);
3897 /* Jamal, now you will not able to escape explaining
3898 * me how you were going to use this. :-)
3907 static int __netif_receive_skb(struct sk_buff *skb)
3911 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
3912 unsigned long pflags = current->flags;
3915 * PFMEMALLOC skbs are special, they should
3916 * - be delivered to SOCK_MEMALLOC sockets only
3917 * - stay away from userspace
3918 * - have bounded memory usage
3920 * Use PF_MEMALLOC as this saves us from propagating the allocation
3921 * context down to all allocation sites.
3923 current->flags |= PF_MEMALLOC;
3924 ret = __netif_receive_skb_core(skb, true);
3925 tsk_restore_flags(current, pflags, PF_MEMALLOC);
3927 ret = __netif_receive_skb_core(skb, false);
3932 static int netif_receive_skb_internal(struct sk_buff *skb)
3936 net_timestamp_check(netdev_tstamp_prequeue, skb);
3938 if (skb_defer_rx_timestamp(skb))
3939 return NET_RX_SUCCESS;
3944 if (static_key_false(&rps_needed)) {
3945 struct rps_dev_flow voidflow, *rflow = &voidflow;
3946 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
3949 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3955 ret = __netif_receive_skb(skb);
3961 * netif_receive_skb - process receive buffer from network
3962 * @skb: buffer to process
3964 * netif_receive_skb() is the main receive data processing function.
3965 * It always succeeds. The buffer may be dropped during processing
3966 * for congestion control or by the protocol layers.
3968 * This function may only be called from softirq context and interrupts
3969 * should be enabled.
3971 * Return values (usually ignored):
3972 * NET_RX_SUCCESS: no congestion
3973 * NET_RX_DROP: packet was dropped
3975 int netif_receive_skb_sk(struct sock *sk, struct sk_buff *skb)
3977 trace_netif_receive_skb_entry(skb);
3979 return netif_receive_skb_internal(skb);
3981 EXPORT_SYMBOL(netif_receive_skb_sk);
3983 /* Network device is going away, flush any packets still pending
3984 * Called with irqs disabled.
3986 static void flush_backlog(void *arg)
3988 struct net_device *dev = arg;
3989 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
3990 struct sk_buff *skb, *tmp;
3993 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3994 if (skb->dev == dev) {
3995 __skb_unlink(skb, &sd->input_pkt_queue);
3997 input_queue_head_incr(sd);
4002 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
4003 if (skb->dev == dev) {
4004 __skb_unlink(skb, &sd->process_queue);
4006 input_queue_head_incr(sd);
4011 static int napi_gro_complete(struct sk_buff *skb)
4013 struct packet_offload *ptype;
4014 __be16 type = skb->protocol;
4015 struct list_head *head = &offload_base;
4018 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
4020 if (NAPI_GRO_CB(skb)->count == 1) {
4021 skb_shinfo(skb)->gso_size = 0;
4026 list_for_each_entry_rcu(ptype, head, list) {
4027 if (ptype->type != type || !ptype->callbacks.gro_complete)
4030 err = ptype->callbacks.gro_complete(skb, 0);
4036 WARN_ON(&ptype->list == head);
4038 return NET_RX_SUCCESS;
4042 return netif_receive_skb_internal(skb);
4045 /* napi->gro_list contains packets ordered by age.
4046 * youngest packets at the head of it.
4047 * Complete skbs in reverse order to reduce latencies.
4049 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
4051 struct sk_buff *skb, *prev = NULL;
4053 /* scan list and build reverse chain */
4054 for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
4059 for (skb = prev; skb; skb = prev) {
4062 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
4066 napi_gro_complete(skb);
4070 napi->gro_list = NULL;
4072 EXPORT_SYMBOL(napi_gro_flush);
4074 static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
4077 unsigned int maclen = skb->dev->hard_header_len;
4078 u32 hash = skb_get_hash_raw(skb);
4080 for (p = napi->gro_list; p; p = p->next) {
4081 unsigned long diffs;
4083 NAPI_GRO_CB(p)->flush = 0;
4085 if (hash != skb_get_hash_raw(p)) {
4086 NAPI_GRO_CB(p)->same_flow = 0;
4090 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
4091 diffs |= p->vlan_tci ^ skb->vlan_tci;
4092 if (maclen == ETH_HLEN)
4093 diffs |= compare_ether_header(skb_mac_header(p),
4094 skb_mac_header(skb));
4096 diffs = memcmp(skb_mac_header(p),
4097 skb_mac_header(skb),
4099 NAPI_GRO_CB(p)->same_flow = !diffs;
4103 static void skb_gro_reset_offset(struct sk_buff *skb)
4105 const struct skb_shared_info *pinfo = skb_shinfo(skb);
4106 const skb_frag_t *frag0 = &pinfo->frags[0];
4108 NAPI_GRO_CB(skb)->data_offset = 0;
4109 NAPI_GRO_CB(skb)->frag0 = NULL;
4110 NAPI_GRO_CB(skb)->frag0_len = 0;
4112 if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
4114 !PageHighMem(skb_frag_page(frag0))) {
4115 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
4116 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
4120 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
4122 struct skb_shared_info *pinfo = skb_shinfo(skb);
4124 BUG_ON(skb->end - skb->tail < grow);
4126 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
4128 skb->data_len -= grow;
4131 pinfo->frags[0].page_offset += grow;
4132 skb_frag_size_sub(&pinfo->frags[0], grow);
4134 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
4135 skb_frag_unref(skb, 0);
4136 memmove(pinfo->frags, pinfo->frags + 1,
4137 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
4141 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4143 struct sk_buff **pp = NULL;
4144 struct packet_offload *ptype;
4145 __be16 type = skb->protocol;
4146 struct list_head *head = &offload_base;
4148 enum gro_result ret;
4151 if (!(skb->dev->features & NETIF_F_GRO))
4154 if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad)
4157 gro_list_prepare(napi, skb);
4160 list_for_each_entry_rcu(ptype, head, list) {
4161 if (ptype->type != type || !ptype->callbacks.gro_receive)
4164 skb_set_network_header(skb, skb_gro_offset(skb));
4165 skb_reset_mac_len(skb);
4166 NAPI_GRO_CB(skb)->same_flow = 0;
4167 NAPI_GRO_CB(skb)->flush = 0;
4168 NAPI_GRO_CB(skb)->free = 0;
4169 NAPI_GRO_CB(skb)->udp_mark = 0;
4170 NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
4172 /* Setup for GRO checksum validation */
4173 switch (skb->ip_summed) {
4174 case CHECKSUM_COMPLETE:
4175 NAPI_GRO_CB(skb)->csum = skb->csum;
4176 NAPI_GRO_CB(skb)->csum_valid = 1;
4177 NAPI_GRO_CB(skb)->csum_cnt = 0;
4179 case CHECKSUM_UNNECESSARY:
4180 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
4181 NAPI_GRO_CB(skb)->csum_valid = 0;
4184 NAPI_GRO_CB(skb)->csum_cnt = 0;
4185 NAPI_GRO_CB(skb)->csum_valid = 0;
4188 pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
4193 if (&ptype->list == head)
4196 same_flow = NAPI_GRO_CB(skb)->same_flow;
4197 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
4200 struct sk_buff *nskb = *pp;
4204 napi_gro_complete(nskb);
4211 if (NAPI_GRO_CB(skb)->flush)
4214 if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
4215 struct sk_buff *nskb = napi->gro_list;
4217 /* locate the end of the list to select the 'oldest' flow */
4218 while (nskb->next) {
4224 napi_gro_complete(nskb);
4228 NAPI_GRO_CB(skb)->count = 1;
4229 NAPI_GRO_CB(skb)->age = jiffies;
4230 NAPI_GRO_CB(skb)->last = skb;
4231 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
4232 skb->next = napi->gro_list;
4233 napi->gro_list = skb;
4237 grow = skb_gro_offset(skb) - skb_headlen(skb);
4239 gro_pull_from_frag0(skb, grow);
4248 struct packet_offload *gro_find_receive_by_type(__be16 type)
4250 struct list_head *offload_head = &offload_base;
4251 struct packet_offload *ptype;
4253 list_for_each_entry_rcu(ptype, offload_head, list) {
4254 if (ptype->type != type || !ptype->callbacks.gro_receive)
4260 EXPORT_SYMBOL(gro_find_receive_by_type);
4262 struct packet_offload *gro_find_complete_by_type(__be16 type)
4264 struct list_head *offload_head = &offload_base;
4265 struct packet_offload *ptype;
4267 list_for_each_entry_rcu(ptype, offload_head, list) {
4268 if (ptype->type != type || !ptype->callbacks.gro_complete)
4274 EXPORT_SYMBOL(gro_find_complete_by_type);
4276 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
4280 if (netif_receive_skb_internal(skb))
4288 case GRO_MERGED_FREE:
4289 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
4290 kmem_cache_free(skbuff_head_cache, skb);
4303 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4305 trace_napi_gro_receive_entry(skb);
4307 skb_gro_reset_offset(skb);
4309 return napi_skb_finish(dev_gro_receive(napi, skb), skb);
4311 EXPORT_SYMBOL(napi_gro_receive);
4313 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
4315 if (unlikely(skb->pfmemalloc)) {
4319 __skb_pull(skb, skb_headlen(skb));
4320 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4321 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
4323 skb->dev = napi->dev;
4325 skb->encapsulation = 0;
4326 skb_shinfo(skb)->gso_type = 0;
4327 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
4332 struct sk_buff *napi_get_frags(struct napi_struct *napi)
4334 struct sk_buff *skb = napi->skb;
4337 skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
4342 EXPORT_SYMBOL(napi_get_frags);
4344 static gro_result_t napi_frags_finish(struct napi_struct *napi,
4345 struct sk_buff *skb,
4351 __skb_push(skb, ETH_HLEN);
4352 skb->protocol = eth_type_trans(skb, skb->dev);
4353 if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
4358 case GRO_MERGED_FREE:
4359 napi_reuse_skb(napi, skb);
4369 /* Upper GRO stack assumes network header starts at gro_offset=0
4370 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4371 * We copy ethernet header into skb->data to have a common layout.
4373 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
4375 struct sk_buff *skb = napi->skb;
4376 const struct ethhdr *eth;
4377 unsigned int hlen = sizeof(*eth);
4381 skb_reset_mac_header(skb);
4382 skb_gro_reset_offset(skb);
4384 eth = skb_gro_header_fast(skb, 0);
4385 if (unlikely(skb_gro_header_hard(skb, hlen))) {
4386 eth = skb_gro_header_slow(skb, hlen, 0);
4387 if (unlikely(!eth)) {
4388 napi_reuse_skb(napi, skb);
4392 gro_pull_from_frag0(skb, hlen);
4393 NAPI_GRO_CB(skb)->frag0 += hlen;
4394 NAPI_GRO_CB(skb)->frag0_len -= hlen;
4396 __skb_pull(skb, hlen);
4399 * This works because the only protocols we care about don't require
4401 * We'll fix it up properly in napi_frags_finish()
4403 skb->protocol = eth->h_proto;
4408 gro_result_t napi_gro_frags(struct napi_struct *napi)
4410 struct sk_buff *skb = napi_frags_skb(napi);
4415 trace_napi_gro_frags_entry(skb);
4417 return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
4419 EXPORT_SYMBOL(napi_gro_frags);
4421 /* Compute the checksum from gro_offset and return the folded value
4422 * after adding in any pseudo checksum.
4424 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
4429 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
4431 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4432 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
4434 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
4435 !skb->csum_complete_sw)
4436 netdev_rx_csum_fault(skb->dev);
4439 NAPI_GRO_CB(skb)->csum = wsum;
4440 NAPI_GRO_CB(skb)->csum_valid = 1;
4444 EXPORT_SYMBOL(__skb_gro_checksum_complete);
4447 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4448 * Note: called with local irq disabled, but exits with local irq enabled.
4450 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
4453 struct softnet_data *remsd = sd->rps_ipi_list;
4456 sd->rps_ipi_list = NULL;
4460 /* Send pending IPI's to kick RPS processing on remote cpus. */
4462 struct softnet_data *next = remsd->rps_ipi_next;
4464 if (cpu_online(remsd->cpu))
4465 smp_call_function_single_async(remsd->cpu,
4474 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
4477 return sd->rps_ipi_list != NULL;
4483 static int process_backlog(struct napi_struct *napi, int quota)
4486 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
4488 /* Check if we have pending ipi, its better to send them now,
4489 * not waiting net_rx_action() end.
4491 if (sd_has_rps_ipi_waiting(sd)) {
4492 local_irq_disable();
4493 net_rps_action_and_irq_enable(sd);
4496 napi->weight = weight_p;
4497 local_irq_disable();
4499 struct sk_buff *skb;
4501 while ((skb = __skb_dequeue(&sd->process_queue))) {
4504 __netif_receive_skb(skb);
4506 local_irq_disable();
4507 input_queue_head_incr(sd);
4508 if (++work >= quota) {
4515 if (skb_queue_empty(&sd->input_pkt_queue)) {
4517 * Inline a custom version of __napi_complete().
4518 * only current cpu owns and manipulates this napi,
4519 * and NAPI_STATE_SCHED is the only possible flag set
4521 * We can use a plain write instead of clear_bit(),
4522 * and we dont need an smp_mb() memory barrier.
4530 skb_queue_splice_tail_init(&sd->input_pkt_queue,
4531 &sd->process_queue);
4540 * __napi_schedule - schedule for receive
4541 * @n: entry to schedule
4543 * The entry's receive function will be scheduled to run.
4544 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4546 void __napi_schedule(struct napi_struct *n)
4548 unsigned long flags;
4550 local_irq_save(flags);
4551 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4552 local_irq_restore(flags);
4554 EXPORT_SYMBOL(__napi_schedule);
4557 * __napi_schedule_irqoff - schedule for receive
4558 * @n: entry to schedule
4560 * Variant of __napi_schedule() assuming hard irqs are masked
4562 void __napi_schedule_irqoff(struct napi_struct *n)
4564 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4566 EXPORT_SYMBOL(__napi_schedule_irqoff);
4568 void __napi_complete(struct napi_struct *n)
4570 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
4572 list_del_init(&n->poll_list);
4573 smp_mb__before_atomic();
4574 clear_bit(NAPI_STATE_SCHED, &n->state);
4576 EXPORT_SYMBOL(__napi_complete);
4578 void napi_complete_done(struct napi_struct *n, int work_done)
4580 unsigned long flags;
4583 * don't let napi dequeue from the cpu poll list
4584 * just in case its running on a different cpu
4586 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
4590 unsigned long timeout = 0;
4593 timeout = n->dev->gro_flush_timeout;
4596 hrtimer_start(&n->timer, ns_to_ktime(timeout),
4597 HRTIMER_MODE_REL_PINNED);
4599 napi_gro_flush(n, false);
4601 if (likely(list_empty(&n->poll_list))) {
4602 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED, &n->state));
4604 /* If n->poll_list is not empty, we need to mask irqs */
4605 local_irq_save(flags);
4607 local_irq_restore(flags);
4610 EXPORT_SYMBOL(napi_complete_done);
4612 /* must be called under rcu_read_lock(), as we dont take a reference */
4613 struct napi_struct *napi_by_id(unsigned int napi_id)
4615 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
4616 struct napi_struct *napi;
4618 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
4619 if (napi->napi_id == napi_id)
4624 EXPORT_SYMBOL_GPL(napi_by_id);
4626 void napi_hash_add(struct napi_struct *napi)
4628 if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) {
4630 spin_lock(&napi_hash_lock);
4632 /* 0 is not a valid id, we also skip an id that is taken
4633 * we expect both events to be extremely rare
4636 while (!napi->napi_id) {
4637 napi->napi_id = ++napi_gen_id;
4638 if (napi_by_id(napi->napi_id))
4642 hlist_add_head_rcu(&napi->napi_hash_node,
4643 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
4645 spin_unlock(&napi_hash_lock);
4648 EXPORT_SYMBOL_GPL(napi_hash_add);
4650 /* Warning : caller is responsible to make sure rcu grace period
4651 * is respected before freeing memory containing @napi
4653 void napi_hash_del(struct napi_struct *napi)
4655 spin_lock(&napi_hash_lock);
4657 if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state))
4658 hlist_del_rcu(&napi->napi_hash_node);
4660 spin_unlock(&napi_hash_lock);
4662 EXPORT_SYMBOL_GPL(napi_hash_del);
4664 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
4666 struct napi_struct *napi;
4668 napi = container_of(timer, struct napi_struct, timer);
4670 napi_schedule(napi);
4672 return HRTIMER_NORESTART;
4675 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
4676 int (*poll)(struct napi_struct *, int), int weight)
4678 INIT_LIST_HEAD(&napi->poll_list);
4679 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
4680 napi->timer.function = napi_watchdog;
4681 napi->gro_count = 0;
4682 napi->gro_list = NULL;
4685 if (weight > NAPI_POLL_WEIGHT)
4686 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4688 napi->weight = weight;
4689 list_add(&napi->dev_list, &dev->napi_list);
4691 #ifdef CONFIG_NETPOLL
4692 spin_lock_init(&napi->poll_lock);
4693 napi->poll_owner = -1;
4695 set_bit(NAPI_STATE_SCHED, &napi->state);
4697 EXPORT_SYMBOL(netif_napi_add);
4699 void napi_disable(struct napi_struct *n)
4702 set_bit(NAPI_STATE_DISABLE, &n->state);
4704 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
4707 hrtimer_cancel(&n->timer);
4709 clear_bit(NAPI_STATE_DISABLE, &n->state);
4711 EXPORT_SYMBOL(napi_disable);
4713 void netif_napi_del(struct napi_struct *napi)
4715 list_del_init(&napi->dev_list);
4716 napi_free_frags(napi);
4718 kfree_skb_list(napi->gro_list);
4719 napi->gro_list = NULL;
4720 napi->gro_count = 0;
4722 EXPORT_SYMBOL(netif_napi_del);
4724 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
4729 list_del_init(&n->poll_list);
4731 have = netpoll_poll_lock(n);
4735 /* This NAPI_STATE_SCHED test is for avoiding a race
4736 * with netpoll's poll_napi(). Only the entity which
4737 * obtains the lock and sees NAPI_STATE_SCHED set will
4738 * actually make the ->poll() call. Therefore we avoid
4739 * accidentally calling ->poll() when NAPI is not scheduled.
4742 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
4743 work = n->poll(n, weight);
4747 WARN_ON_ONCE(work > weight);
4749 if (likely(work < weight))
4752 /* Drivers must not modify the NAPI state if they
4753 * consume the entire weight. In such cases this code
4754 * still "owns" the NAPI instance and therefore can
4755 * move the instance around on the list at-will.
4757 if (unlikely(napi_disable_pending(n))) {
4763 /* flush too old packets
4764 * If HZ < 1000, flush all packets.
4766 napi_gro_flush(n, HZ >= 1000);
4769 /* Some drivers may have called napi_schedule
4770 * prior to exhausting their budget.
4772 if (unlikely(!list_empty(&n->poll_list))) {
4773 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
4774 n->dev ? n->dev->name : "backlog");
4778 list_add_tail(&n->poll_list, repoll);
4781 netpoll_poll_unlock(have);
4786 static void net_rx_action(struct softirq_action *h)
4788 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
4789 unsigned long time_limit = jiffies + 2;
4790 int budget = netdev_budget;
4794 local_irq_disable();
4795 list_splice_init(&sd->poll_list, &list);
4799 struct napi_struct *n;
4801 if (list_empty(&list)) {
4802 if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
4807 n = list_first_entry(&list, struct napi_struct, poll_list);
4808 budget -= napi_poll(n, &repoll);
4810 /* If softirq window is exhausted then punt.
4811 * Allow this to run for 2 jiffies since which will allow
4812 * an average latency of 1.5/HZ.
4814 if (unlikely(budget <= 0 ||
4815 time_after_eq(jiffies, time_limit))) {
4821 local_irq_disable();
4823 list_splice_tail_init(&sd->poll_list, &list);
4824 list_splice_tail(&repoll, &list);
4825 list_splice(&list, &sd->poll_list);
4826 if (!list_empty(&sd->poll_list))
4827 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4829 net_rps_action_and_irq_enable(sd);
4832 struct netdev_adjacent {
4833 struct net_device *dev;
4835 /* upper master flag, there can only be one master device per list */
4838 /* counter for the number of times this device was added to us */
4841 /* private field for the users */
4844 struct list_head list;
4845 struct rcu_head rcu;
4848 static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev,
4849 struct net_device *adj_dev,
4850 struct list_head *adj_list)
4852 struct netdev_adjacent *adj;
4854 list_for_each_entry(adj, adj_list, list) {
4855 if (adj->dev == adj_dev)
4862 * netdev_has_upper_dev - Check if device is linked to an upper device
4864 * @upper_dev: upper device to check
4866 * Find out if a device is linked to specified upper device and return true
4867 * in case it is. Note that this checks only immediate upper device,
4868 * not through a complete stack of devices. The caller must hold the RTNL lock.
4870 bool netdev_has_upper_dev(struct net_device *dev,
4871 struct net_device *upper_dev)
4875 return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper);
4877 EXPORT_SYMBOL(netdev_has_upper_dev);
4880 * netdev_has_any_upper_dev - Check if device is linked to some device
4883 * Find out if a device is linked to an upper device and return true in case
4884 * it is. The caller must hold the RTNL lock.
4886 static bool netdev_has_any_upper_dev(struct net_device *dev)
4890 return !list_empty(&dev->all_adj_list.upper);
4894 * netdev_master_upper_dev_get - Get master upper device
4897 * Find a master upper device and return pointer to it or NULL in case
4898 * it's not there. The caller must hold the RTNL lock.
4900 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
4902 struct netdev_adjacent *upper;
4906 if (list_empty(&dev->adj_list.upper))
4909 upper = list_first_entry(&dev->adj_list.upper,
4910 struct netdev_adjacent, list);
4911 if (likely(upper->master))
4915 EXPORT_SYMBOL(netdev_master_upper_dev_get);
4917 void *netdev_adjacent_get_private(struct list_head *adj_list)
4919 struct netdev_adjacent *adj;
4921 adj = list_entry(adj_list, struct netdev_adjacent, list);
4923 return adj->private;
4925 EXPORT_SYMBOL(netdev_adjacent_get_private);
4928 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4930 * @iter: list_head ** of the current position
4932 * Gets the next device from the dev's upper list, starting from iter
4933 * position. The caller must hold RCU read lock.
4935 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
4936 struct list_head **iter)
4938 struct netdev_adjacent *upper;
4940 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4942 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
4944 if (&upper->list == &dev->adj_list.upper)
4947 *iter = &upper->list;
4951 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
4954 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4956 * @iter: list_head ** of the current position
4958 * Gets the next device from the dev's upper list, starting from iter
4959 * position. The caller must hold RCU read lock.
4961 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
4962 struct list_head **iter)
4964 struct netdev_adjacent *upper;
4966 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4968 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
4970 if (&upper->list == &dev->all_adj_list.upper)
4973 *iter = &upper->list;
4977 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu);
4980 * netdev_lower_get_next_private - Get the next ->private from the
4981 * lower neighbour list
4983 * @iter: list_head ** of the current position
4985 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4986 * list, starting from iter position. The caller must hold either hold the
4987 * RTNL lock or its own locking that guarantees that the neighbour lower
4988 * list will remain unchainged.
4990 void *netdev_lower_get_next_private(struct net_device *dev,
4991 struct list_head **iter)
4993 struct netdev_adjacent *lower;
4995 lower = list_entry(*iter, struct netdev_adjacent, list);
4997 if (&lower->list == &dev->adj_list.lower)
5000 *iter = lower->list.next;
5002 return lower->private;
5004 EXPORT_SYMBOL(netdev_lower_get_next_private);
5007 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5008 * lower neighbour list, RCU
5011 * @iter: list_head ** of the current position
5013 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5014 * list, starting from iter position. The caller must hold RCU read lock.
5016 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
5017 struct list_head **iter)
5019 struct netdev_adjacent *lower;
5021 WARN_ON_ONCE(!rcu_read_lock_held());
5023 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5025 if (&lower->list == &dev->adj_list.lower)
5028 *iter = &lower->list;
5030 return lower->private;
5032 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
5035 * netdev_lower_get_next - Get the next device from the lower neighbour
5038 * @iter: list_head ** of the current position
5040 * Gets the next netdev_adjacent from the dev's lower neighbour
5041 * list, starting from iter position. The caller must hold RTNL lock or
5042 * its own locking that guarantees that the neighbour lower
5043 * list will remain unchainged.
5045 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
5047 struct netdev_adjacent *lower;
5049 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
5051 if (&lower->list == &dev->adj_list.lower)
5054 *iter = &lower->list;
5058 EXPORT_SYMBOL(netdev_lower_get_next);
5061 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5062 * lower neighbour list, RCU
5066 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5067 * list. The caller must hold RCU read lock.
5069 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
5071 struct netdev_adjacent *lower;
5073 lower = list_first_or_null_rcu(&dev->adj_list.lower,
5074 struct netdev_adjacent, list);
5076 return lower->private;
5079 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
5082 * netdev_master_upper_dev_get_rcu - Get master upper device
5085 * Find a master upper device and return pointer to it or NULL in case
5086 * it's not there. The caller must hold the RCU read lock.
5088 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
5090 struct netdev_adjacent *upper;
5092 upper = list_first_or_null_rcu(&dev->adj_list.upper,
5093 struct netdev_adjacent, list);
5094 if (upper && likely(upper->master))
5098 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
5100 static int netdev_adjacent_sysfs_add(struct net_device *dev,
5101 struct net_device *adj_dev,
5102 struct list_head *dev_list)
5104 char linkname[IFNAMSIZ+7];
5105 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5106 "upper_%s" : "lower_%s", adj_dev->name);
5107 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
5110 static void netdev_adjacent_sysfs_del(struct net_device *dev,
5112 struct list_head *dev_list)
5114 char linkname[IFNAMSIZ+7];
5115 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5116 "upper_%s" : "lower_%s", name);
5117 sysfs_remove_link(&(dev->dev.kobj), linkname);
5120 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
5121 struct net_device *adj_dev,
5122 struct list_head *dev_list)
5124 return (dev_list == &dev->adj_list.upper ||
5125 dev_list == &dev->adj_list.lower) &&
5126 net_eq(dev_net(dev), dev_net(adj_dev));
5129 static int __netdev_adjacent_dev_insert(struct net_device *dev,
5130 struct net_device *adj_dev,
5131 struct list_head *dev_list,
5132 void *private, bool master)
5134 struct netdev_adjacent *adj;
5137 adj = __netdev_find_adj(dev, adj_dev, dev_list);
5144 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
5149 adj->master = master;
5151 adj->private = private;
5154 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5155 adj_dev->name, dev->name, adj_dev->name);
5157 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
5158 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
5163 /* Ensure that master link is always the first item in list. */
5165 ret = sysfs_create_link(&(dev->dev.kobj),
5166 &(adj_dev->dev.kobj), "master");
5168 goto remove_symlinks;
5170 list_add_rcu(&adj->list, dev_list);
5172 list_add_tail_rcu(&adj->list, dev_list);
5178 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5179 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5187 static void __netdev_adjacent_dev_remove(struct net_device *dev,
5188 struct net_device *adj_dev,
5189 struct list_head *dev_list)
5191 struct netdev_adjacent *adj;
5193 adj = __netdev_find_adj(dev, adj_dev, dev_list);
5196 pr_err("tried to remove device %s from %s\n",
5197 dev->name, adj_dev->name);
5201 if (adj->ref_nr > 1) {
5202 pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name,
5209 sysfs_remove_link(&(dev->dev.kobj), "master");
5211 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5212 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5214 list_del_rcu(&adj->list);
5215 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5216 adj_dev->name, dev->name, adj_dev->name);
5218 kfree_rcu(adj, rcu);
5221 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
5222 struct net_device *upper_dev,
5223 struct list_head *up_list,
5224 struct list_head *down_list,
5225 void *private, bool master)
5229 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private,
5234 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private,
5237 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5244 static int __netdev_adjacent_dev_link(struct net_device *dev,
5245 struct net_device *upper_dev)
5247 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
5248 &dev->all_adj_list.upper,
5249 &upper_dev->all_adj_list.lower,
5253 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
5254 struct net_device *upper_dev,
5255 struct list_head *up_list,
5256 struct list_head *down_list)
5258 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5259 __netdev_adjacent_dev_remove(upper_dev, dev, down_list);
5262 static void __netdev_adjacent_dev_unlink(struct net_device *dev,
5263 struct net_device *upper_dev)
5265 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5266 &dev->all_adj_list.upper,
5267 &upper_dev->all_adj_list.lower);
5270 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
5271 struct net_device *upper_dev,
5272 void *private, bool master)
5274 int ret = __netdev_adjacent_dev_link(dev, upper_dev);
5279 ret = __netdev_adjacent_dev_link_lists(dev, upper_dev,
5280 &dev->adj_list.upper,
5281 &upper_dev->adj_list.lower,
5284 __netdev_adjacent_dev_unlink(dev, upper_dev);
5291 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
5292 struct net_device *upper_dev)
5294 __netdev_adjacent_dev_unlink(dev, upper_dev);
5295 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5296 &dev->adj_list.upper,
5297 &upper_dev->adj_list.lower);
5300 static int __netdev_upper_dev_link(struct net_device *dev,
5301 struct net_device *upper_dev, bool master,
5304 struct netdev_adjacent *i, *j, *to_i, *to_j;
5305 struct netdev_changeupper_info changeupper_info;
5310 if (dev == upper_dev)
5313 /* To prevent loops, check if dev is not upper device to upper_dev. */
5314 if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper))
5317 if (__netdev_find_adj(dev, upper_dev, &dev->adj_list.upper))
5320 if (master && netdev_master_upper_dev_get(dev))
5323 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private,
5328 /* Now that we linked these devs, make all the upper_dev's
5329 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5330 * versa, and don't forget the devices itself. All of these
5331 * links are non-neighbours.
5333 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5334 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5335 pr_debug("Interlinking %s with %s, non-neighbour\n",
5336 i->dev->name, j->dev->name);
5337 ret = __netdev_adjacent_dev_link(i->dev, j->dev);
5343 /* add dev to every upper_dev's upper device */
5344 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5345 pr_debug("linking %s's upper device %s with %s\n",
5346 upper_dev->name, i->dev->name, dev->name);
5347 ret = __netdev_adjacent_dev_link(dev, i->dev);
5349 goto rollback_upper_mesh;
5352 /* add upper_dev to every dev's lower device */
5353 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5354 pr_debug("linking %s's lower device %s with %s\n", dev->name,
5355 i->dev->name, upper_dev->name);
5356 ret = __netdev_adjacent_dev_link(i->dev, upper_dev);
5358 goto rollback_lower_mesh;
5361 changeupper_info.event = NETDEV_CHANGEUPPER_LINK;
5362 changeupper_info.upper = upper_dev;
5363 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5364 &changeupper_info.info);
5367 rollback_lower_mesh:
5369 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5372 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5377 rollback_upper_mesh:
5379 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5382 __netdev_adjacent_dev_unlink(dev, i->dev);
5390 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5391 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5392 if (i == to_i && j == to_j)
5394 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5400 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5406 * netdev_upper_dev_link - Add a link to the upper device
5408 * @upper_dev: new upper device
5410 * Adds a link to device which is upper to this one. The caller must hold
5411 * the RTNL lock. On a failure a negative errno code is returned.
5412 * On success the reference counts are adjusted and the function
5415 int netdev_upper_dev_link(struct net_device *dev,
5416 struct net_device *upper_dev)
5418 return __netdev_upper_dev_link(dev, upper_dev, false, NULL);
5420 EXPORT_SYMBOL(netdev_upper_dev_link);
5423 * netdev_master_upper_dev_link - Add a master link to the upper device
5425 * @upper_dev: new upper device
5427 * Adds a link to device which is upper to this one. In this case, only
5428 * one master upper device can be linked, although other non-master devices
5429 * might be linked as well. The caller must hold the RTNL lock.
5430 * On a failure a negative errno code is returned. On success the reference
5431 * counts are adjusted and the function returns zero.
5433 int netdev_master_upper_dev_link(struct net_device *dev,
5434 struct net_device *upper_dev)
5436 return __netdev_upper_dev_link(dev, upper_dev, true, NULL);
5438 EXPORT_SYMBOL(netdev_master_upper_dev_link);
5440 int netdev_master_upper_dev_link_private(struct net_device *dev,
5441 struct net_device *upper_dev,
5444 return __netdev_upper_dev_link(dev, upper_dev, true, private);
5446 EXPORT_SYMBOL(netdev_master_upper_dev_link_private);
5449 * netdev_upper_dev_unlink - Removes a link to upper device
5451 * @upper_dev: new upper device
5453 * Removes a link to device which is upper to this one. The caller must hold
5456 void netdev_upper_dev_unlink(struct net_device *dev,
5457 struct net_device *upper_dev)
5459 struct netdev_adjacent *i, *j;
5460 struct netdev_changeupper_info changeupper_info;
5463 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5465 /* Here is the tricky part. We must remove all dev's lower
5466 * devices from all upper_dev's upper devices and vice
5467 * versa, to maintain the graph relationship.
5469 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5470 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list)
5471 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5473 /* remove also the devices itself from lower/upper device
5476 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5477 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5479 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
5480 __netdev_adjacent_dev_unlink(dev, i->dev);
5482 changeupper_info.event = NETDEV_CHANGEUPPER_UNLINK;
5483 changeupper_info.upper = upper_dev;
5484 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5485 &changeupper_info.info);
5487 EXPORT_SYMBOL(netdev_upper_dev_unlink);
5490 * netdev_bonding_info_change - Dispatch event about slave change
5492 * @bonding_info: info to dispatch
5494 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5495 * The caller must hold the RTNL lock.
5497 void netdev_bonding_info_change(struct net_device *dev,
5498 struct netdev_bonding_info *bonding_info)
5500 struct netdev_notifier_bonding_info info;
5502 memcpy(&info.bonding_info, bonding_info,
5503 sizeof(struct netdev_bonding_info));
5504 call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev,
5507 EXPORT_SYMBOL(netdev_bonding_info_change);
5509 static void netdev_adjacent_add_links(struct net_device *dev)
5511 struct netdev_adjacent *iter;
5513 struct net *net = dev_net(dev);
5515 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5516 if (!net_eq(net,dev_net(iter->dev)))
5518 netdev_adjacent_sysfs_add(iter->dev, dev,
5519 &iter->dev->adj_list.lower);
5520 netdev_adjacent_sysfs_add(dev, iter->dev,
5521 &dev->adj_list.upper);
5524 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5525 if (!net_eq(net,dev_net(iter->dev)))
5527 netdev_adjacent_sysfs_add(iter->dev, dev,
5528 &iter->dev->adj_list.upper);
5529 netdev_adjacent_sysfs_add(dev, iter->dev,
5530 &dev->adj_list.lower);
5534 static void netdev_adjacent_del_links(struct net_device *dev)
5536 struct netdev_adjacent *iter;
5538 struct net *net = dev_net(dev);
5540 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5541 if (!net_eq(net,dev_net(iter->dev)))
5543 netdev_adjacent_sysfs_del(iter->dev, dev->name,
5544 &iter->dev->adj_list.lower);
5545 netdev_adjacent_sysfs_del(dev, iter->dev->name,
5546 &dev->adj_list.upper);
5549 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5550 if (!net_eq(net,dev_net(iter->dev)))
5552 netdev_adjacent_sysfs_del(iter->dev, dev->name,
5553 &iter->dev->adj_list.upper);
5554 netdev_adjacent_sysfs_del(dev, iter->dev->name,
5555 &dev->adj_list.lower);
5559 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
5561 struct netdev_adjacent *iter;
5563 struct net *net = dev_net(dev);
5565 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5566 if (!net_eq(net,dev_net(iter->dev)))
5568 netdev_adjacent_sysfs_del(iter->dev, oldname,
5569 &iter->dev->adj_list.lower);
5570 netdev_adjacent_sysfs_add(iter->dev, dev,
5571 &iter->dev->adj_list.lower);
5574 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5575 if (!net_eq(net,dev_net(iter->dev)))
5577 netdev_adjacent_sysfs_del(iter->dev, oldname,
5578 &iter->dev->adj_list.upper);
5579 netdev_adjacent_sysfs_add(iter->dev, dev,
5580 &iter->dev->adj_list.upper);
5584 void *netdev_lower_dev_get_private(struct net_device *dev,
5585 struct net_device *lower_dev)
5587 struct netdev_adjacent *lower;
5591 lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower);
5595 return lower->private;
5597 EXPORT_SYMBOL(netdev_lower_dev_get_private);
5600 int dev_get_nest_level(struct net_device *dev,
5601 bool (*type_check)(struct net_device *dev))
5603 struct net_device *lower = NULL;
5604 struct list_head *iter;
5610 netdev_for_each_lower_dev(dev, lower, iter) {
5611 nest = dev_get_nest_level(lower, type_check);
5612 if (max_nest < nest)
5616 if (type_check(dev))
5621 EXPORT_SYMBOL(dev_get_nest_level);
5623 static void dev_change_rx_flags(struct net_device *dev, int flags)
5625 const struct net_device_ops *ops = dev->netdev_ops;
5627 if (ops->ndo_change_rx_flags)
5628 ops->ndo_change_rx_flags(dev, flags);
5631 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
5633 unsigned int old_flags = dev->flags;
5639 dev->flags |= IFF_PROMISC;
5640 dev->promiscuity += inc;
5641 if (dev->promiscuity == 0) {
5644 * If inc causes overflow, untouch promisc and return error.
5647 dev->flags &= ~IFF_PROMISC;
5649 dev->promiscuity -= inc;
5650 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5655 if (dev->flags != old_flags) {
5656 pr_info("device %s %s promiscuous mode\n",
5658 dev->flags & IFF_PROMISC ? "entered" : "left");
5659 if (audit_enabled) {
5660 current_uid_gid(&uid, &gid);
5661 audit_log(current->audit_context, GFP_ATOMIC,
5662 AUDIT_ANOM_PROMISCUOUS,
5663 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5664 dev->name, (dev->flags & IFF_PROMISC),
5665 (old_flags & IFF_PROMISC),
5666 from_kuid(&init_user_ns, audit_get_loginuid(current)),
5667 from_kuid(&init_user_ns, uid),
5668 from_kgid(&init_user_ns, gid),
5669 audit_get_sessionid(current));
5672 dev_change_rx_flags(dev, IFF_PROMISC);
5675 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
5680 * dev_set_promiscuity - update promiscuity count on a device
5684 * Add or remove promiscuity from a device. While the count in the device
5685 * remains above zero the interface remains promiscuous. Once it hits zero
5686 * the device reverts back to normal filtering operation. A negative inc
5687 * value is used to drop promiscuity on the device.
5688 * Return 0 if successful or a negative errno code on error.
5690 int dev_set_promiscuity(struct net_device *dev, int inc)
5692 unsigned int old_flags = dev->flags;
5695 err = __dev_set_promiscuity(dev, inc, true);
5698 if (dev->flags != old_flags)
5699 dev_set_rx_mode(dev);
5702 EXPORT_SYMBOL(dev_set_promiscuity);
5704 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
5706 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
5710 dev->flags |= IFF_ALLMULTI;
5711 dev->allmulti += inc;
5712 if (dev->allmulti == 0) {
5715 * If inc causes overflow, untouch allmulti and return error.
5718 dev->flags &= ~IFF_ALLMULTI;
5720 dev->allmulti -= inc;
5721 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5726 if (dev->flags ^ old_flags) {
5727 dev_change_rx_flags(dev, IFF_ALLMULTI);
5728 dev_set_rx_mode(dev);
5730 __dev_notify_flags(dev, old_flags,
5731 dev->gflags ^ old_gflags);
5737 * dev_set_allmulti - update allmulti count on a device
5741 * Add or remove reception of all multicast frames to a device. While the
5742 * count in the device remains above zero the interface remains listening
5743 * to all interfaces. Once it hits zero the device reverts back to normal
5744 * filtering operation. A negative @inc value is used to drop the counter
5745 * when releasing a resource needing all multicasts.
5746 * Return 0 if successful or a negative errno code on error.
5749 int dev_set_allmulti(struct net_device *dev, int inc)
5751 return __dev_set_allmulti(dev, inc, true);
5753 EXPORT_SYMBOL(dev_set_allmulti);
5756 * Upload unicast and multicast address lists to device and
5757 * configure RX filtering. When the device doesn't support unicast
5758 * filtering it is put in promiscuous mode while unicast addresses
5761 void __dev_set_rx_mode(struct net_device *dev)
5763 const struct net_device_ops *ops = dev->netdev_ops;
5765 /* dev_open will call this function so the list will stay sane. */
5766 if (!(dev->flags&IFF_UP))
5769 if (!netif_device_present(dev))
5772 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
5773 /* Unicast addresses changes may only happen under the rtnl,
5774 * therefore calling __dev_set_promiscuity here is safe.
5776 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
5777 __dev_set_promiscuity(dev, 1, false);
5778 dev->uc_promisc = true;
5779 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
5780 __dev_set_promiscuity(dev, -1, false);
5781 dev->uc_promisc = false;
5785 if (ops->ndo_set_rx_mode)
5786 ops->ndo_set_rx_mode(dev);
5789 void dev_set_rx_mode(struct net_device *dev)
5791 netif_addr_lock_bh(dev);
5792 __dev_set_rx_mode(dev);
5793 netif_addr_unlock_bh(dev);
5797 * dev_get_flags - get flags reported to userspace
5800 * Get the combination of flag bits exported through APIs to userspace.
5802 unsigned int dev_get_flags(const struct net_device *dev)
5806 flags = (dev->flags & ~(IFF_PROMISC |
5811 (dev->gflags & (IFF_PROMISC |
5814 if (netif_running(dev)) {
5815 if (netif_oper_up(dev))
5816 flags |= IFF_RUNNING;
5817 if (netif_carrier_ok(dev))
5818 flags |= IFF_LOWER_UP;
5819 if (netif_dormant(dev))
5820 flags |= IFF_DORMANT;
5825 EXPORT_SYMBOL(dev_get_flags);
5827 int __dev_change_flags(struct net_device *dev, unsigned int flags)
5829 unsigned int old_flags = dev->flags;
5835 * Set the flags on our device.
5838 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
5839 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
5841 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
5845 * Load in the correct multicast list now the flags have changed.
5848 if ((old_flags ^ flags) & IFF_MULTICAST)
5849 dev_change_rx_flags(dev, IFF_MULTICAST);
5851 dev_set_rx_mode(dev);
5854 * Have we downed the interface. We handle IFF_UP ourselves
5855 * according to user attempts to set it, rather than blindly
5860 if ((old_flags ^ flags) & IFF_UP)
5861 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
5863 if ((flags ^ dev->gflags) & IFF_PROMISC) {
5864 int inc = (flags & IFF_PROMISC) ? 1 : -1;
5865 unsigned int old_flags = dev->flags;
5867 dev->gflags ^= IFF_PROMISC;
5869 if (__dev_set_promiscuity(dev, inc, false) >= 0)
5870 if (dev->flags != old_flags)
5871 dev_set_rx_mode(dev);
5874 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5875 is important. Some (broken) drivers set IFF_PROMISC, when
5876 IFF_ALLMULTI is requested not asking us and not reporting.
5878 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
5879 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
5881 dev->gflags ^= IFF_ALLMULTI;
5882 __dev_set_allmulti(dev, inc, false);
5888 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
5889 unsigned int gchanges)
5891 unsigned int changes = dev->flags ^ old_flags;
5894 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
5896 if (changes & IFF_UP) {
5897 if (dev->flags & IFF_UP)
5898 call_netdevice_notifiers(NETDEV_UP, dev);
5900 call_netdevice_notifiers(NETDEV_DOWN, dev);
5903 if (dev->flags & IFF_UP &&
5904 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
5905 struct netdev_notifier_change_info change_info;
5907 change_info.flags_changed = changes;
5908 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
5914 * dev_change_flags - change device settings
5916 * @flags: device state flags
5918 * Change settings on device based state flags. The flags are
5919 * in the userspace exported format.
5921 int dev_change_flags(struct net_device *dev, unsigned int flags)
5924 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
5926 ret = __dev_change_flags(dev, flags);
5930 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
5931 __dev_notify_flags(dev, old_flags, changes);
5934 EXPORT_SYMBOL(dev_change_flags);
5936 static int __dev_set_mtu(struct net_device *dev, int new_mtu)
5938 const struct net_device_ops *ops = dev->netdev_ops;
5940 if (ops->ndo_change_mtu)
5941 return ops->ndo_change_mtu(dev, new_mtu);
5948 * dev_set_mtu - Change maximum transfer unit
5950 * @new_mtu: new transfer unit
5952 * Change the maximum transfer size of the network device.
5954 int dev_set_mtu(struct net_device *dev, int new_mtu)
5958 if (new_mtu == dev->mtu)
5961 /* MTU must be positive. */
5965 if (!netif_device_present(dev))
5968 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
5969 err = notifier_to_errno(err);
5973 orig_mtu = dev->mtu;
5974 err = __dev_set_mtu(dev, new_mtu);
5977 err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
5978 err = notifier_to_errno(err);
5980 /* setting mtu back and notifying everyone again,
5981 * so that they have a chance to revert changes.
5983 __dev_set_mtu(dev, orig_mtu);
5984 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
5989 EXPORT_SYMBOL(dev_set_mtu);
5992 * dev_set_group - Change group this device belongs to
5994 * @new_group: group this device should belong to
5996 void dev_set_group(struct net_device *dev, int new_group)
5998 dev->group = new_group;
6000 EXPORT_SYMBOL(dev_set_group);
6003 * dev_set_mac_address - Change Media Access Control Address
6007 * Change the hardware (MAC) address of the device
6009 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
6011 const struct net_device_ops *ops = dev->netdev_ops;
6014 if (!ops->ndo_set_mac_address)
6016 if (sa->sa_family != dev->type)
6018 if (!netif_device_present(dev))
6020 err = ops->ndo_set_mac_address(dev, sa);
6023 dev->addr_assign_type = NET_ADDR_SET;
6024 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
6025 add_device_randomness(dev->dev_addr, dev->addr_len);
6028 EXPORT_SYMBOL(dev_set_mac_address);
6031 * dev_change_carrier - Change device carrier
6033 * @new_carrier: new value
6035 * Change device carrier
6037 int dev_change_carrier(struct net_device *dev, bool new_carrier)
6039 const struct net_device_ops *ops = dev->netdev_ops;
6041 if (!ops->ndo_change_carrier)
6043 if (!netif_device_present(dev))
6045 return ops->ndo_change_carrier(dev, new_carrier);
6047 EXPORT_SYMBOL(dev_change_carrier);
6050 * dev_get_phys_port_id - Get device physical port ID
6054 * Get device physical port ID
6056 int dev_get_phys_port_id(struct net_device *dev,
6057 struct netdev_phys_item_id *ppid)
6059 const struct net_device_ops *ops = dev->netdev_ops;
6061 if (!ops->ndo_get_phys_port_id)
6063 return ops->ndo_get_phys_port_id(dev, ppid);
6065 EXPORT_SYMBOL(dev_get_phys_port_id);
6068 * dev_get_phys_port_name - Get device physical port name
6072 * Get device physical port name
6074 int dev_get_phys_port_name(struct net_device *dev,
6075 char *name, size_t len)
6077 const struct net_device_ops *ops = dev->netdev_ops;
6079 if (!ops->ndo_get_phys_port_name)
6081 return ops->ndo_get_phys_port_name(dev, name, len);
6083 EXPORT_SYMBOL(dev_get_phys_port_name);
6086 * dev_new_index - allocate an ifindex
6087 * @net: the applicable net namespace
6089 * Returns a suitable unique value for a new device interface
6090 * number. The caller must hold the rtnl semaphore or the
6091 * dev_base_lock to be sure it remains unique.
6093 static int dev_new_index(struct net *net)
6095 int ifindex = net->ifindex;
6099 if (!__dev_get_by_index(net, ifindex))
6100 return net->ifindex = ifindex;
6104 /* Delayed registration/unregisteration */
6105 static LIST_HEAD(net_todo_list);
6106 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
6108 static void net_set_todo(struct net_device *dev)
6110 list_add_tail(&dev->todo_list, &net_todo_list);
6111 dev_net(dev)->dev_unreg_count++;
6114 static void rollback_registered_many(struct list_head *head)
6116 struct net_device *dev, *tmp;
6117 LIST_HEAD(close_head);
6119 BUG_ON(dev_boot_phase);
6122 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
6123 /* Some devices call without registering
6124 * for initialization unwind. Remove those
6125 * devices and proceed with the remaining.
6127 if (dev->reg_state == NETREG_UNINITIALIZED) {
6128 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6132 list_del(&dev->unreg_list);
6135 dev->dismantle = true;
6136 BUG_ON(dev->reg_state != NETREG_REGISTERED);
6139 /* If device is running, close it first. */
6140 list_for_each_entry(dev, head, unreg_list)
6141 list_add_tail(&dev->close_list, &close_head);
6142 dev_close_many(&close_head, true);
6144 list_for_each_entry(dev, head, unreg_list) {
6145 /* And unlink it from device chain. */
6146 unlist_netdevice(dev);
6148 dev->reg_state = NETREG_UNREGISTERING;
6149 on_each_cpu(flush_backlog, dev, 1);
6154 list_for_each_entry(dev, head, unreg_list) {
6155 struct sk_buff *skb = NULL;
6157 /* Shutdown queueing discipline. */
6161 /* Notify protocols, that we are about to destroy
6162 this device. They should clean all the things.
6164 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6166 if (!dev->rtnl_link_ops ||
6167 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6168 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U,
6172 * Flush the unicast and multicast chains
6177 if (dev->netdev_ops->ndo_uninit)
6178 dev->netdev_ops->ndo_uninit(dev);
6181 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);
6183 /* Notifier chain MUST detach us all upper devices. */
6184 WARN_ON(netdev_has_any_upper_dev(dev));
6186 /* Remove entries from kobject tree */
6187 netdev_unregister_kobject(dev);
6189 /* Remove XPS queueing entries */
6190 netif_reset_xps_queues_gt(dev, 0);
6196 list_for_each_entry(dev, head, unreg_list)
6200 static void rollback_registered(struct net_device *dev)
6204 list_add(&dev->unreg_list, &single);
6205 rollback_registered_many(&single);
6209 static netdev_features_t netdev_fix_features(struct net_device *dev,
6210 netdev_features_t features)
6212 /* Fix illegal checksum combinations */
6213 if ((features & NETIF_F_HW_CSUM) &&
6214 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
6215 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
6216 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
6219 /* TSO requires that SG is present as well. */
6220 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
6221 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
6222 features &= ~NETIF_F_ALL_TSO;
6225 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
6226 !(features & NETIF_F_IP_CSUM)) {
6227 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
6228 features &= ~NETIF_F_TSO;
6229 features &= ~NETIF_F_TSO_ECN;
6232 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
6233 !(features & NETIF_F_IPV6_CSUM)) {
6234 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
6235 features &= ~NETIF_F_TSO6;
6238 /* TSO ECN requires that TSO is present as well. */
6239 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
6240 features &= ~NETIF_F_TSO_ECN;
6242 /* Software GSO depends on SG. */
6243 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
6244 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
6245 features &= ~NETIF_F_GSO;
6248 /* UFO needs SG and checksumming */
6249 if (features & NETIF_F_UFO) {
6250 /* maybe split UFO into V4 and V6? */
6251 if (!((features & NETIF_F_GEN_CSUM) ||
6252 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
6253 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
6255 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6256 features &= ~NETIF_F_UFO;
6259 if (!(features & NETIF_F_SG)) {
6261 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6262 features &= ~NETIF_F_UFO;
6266 #ifdef CONFIG_NET_RX_BUSY_POLL
6267 if (dev->netdev_ops->ndo_busy_poll)
6268 features |= NETIF_F_BUSY_POLL;
6271 features &= ~NETIF_F_BUSY_POLL;
6276 int __netdev_update_features(struct net_device *dev)
6278 netdev_features_t features;
6283 features = netdev_get_wanted_features(dev);
6285 if (dev->netdev_ops->ndo_fix_features)
6286 features = dev->netdev_ops->ndo_fix_features(dev, features);
6288 /* driver might be less strict about feature dependencies */
6289 features = netdev_fix_features(dev, features);
6291 if (dev->features == features)
6294 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
6295 &dev->features, &features);
6297 if (dev->netdev_ops->ndo_set_features)
6298 err = dev->netdev_ops->ndo_set_features(dev, features);
6300 if (unlikely(err < 0)) {
6302 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6303 err, &features, &dev->features);
6308 dev->features = features;
6314 * netdev_update_features - recalculate device features
6315 * @dev: the device to check
6317 * Recalculate dev->features set and send notifications if it
6318 * has changed. Should be called after driver or hardware dependent
6319 * conditions might have changed that influence the features.
6321 void netdev_update_features(struct net_device *dev)
6323 if (__netdev_update_features(dev))
6324 netdev_features_change(dev);
6326 EXPORT_SYMBOL(netdev_update_features);
6329 * netdev_change_features - recalculate device features
6330 * @dev: the device to check
6332 * Recalculate dev->features set and send notifications even
6333 * if they have not changed. Should be called instead of
6334 * netdev_update_features() if also dev->vlan_features might
6335 * have changed to allow the changes to be propagated to stacked
6338 void netdev_change_features(struct net_device *dev)
6340 __netdev_update_features(dev);
6341 netdev_features_change(dev);
6343 EXPORT_SYMBOL(netdev_change_features);
6346 * netif_stacked_transfer_operstate - transfer operstate
6347 * @rootdev: the root or lower level device to transfer state from
6348 * @dev: the device to transfer operstate to
6350 * Transfer operational state from root to device. This is normally
6351 * called when a stacking relationship exists between the root
6352 * device and the device(a leaf device).
6354 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
6355 struct net_device *dev)
6357 if (rootdev->operstate == IF_OPER_DORMANT)
6358 netif_dormant_on(dev);
6360 netif_dormant_off(dev);
6362 if (netif_carrier_ok(rootdev)) {
6363 if (!netif_carrier_ok(dev))
6364 netif_carrier_on(dev);
6366 if (netif_carrier_ok(dev))
6367 netif_carrier_off(dev);
6370 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
6373 static int netif_alloc_rx_queues(struct net_device *dev)
6375 unsigned int i, count = dev->num_rx_queues;
6376 struct netdev_rx_queue *rx;
6377 size_t sz = count * sizeof(*rx);
6381 rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6389 for (i = 0; i < count; i++)
6395 static void netdev_init_one_queue(struct net_device *dev,
6396 struct netdev_queue *queue, void *_unused)
6398 /* Initialize queue lock */
6399 spin_lock_init(&queue->_xmit_lock);
6400 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
6401 queue->xmit_lock_owner = -1;
6402 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
6405 dql_init(&queue->dql, HZ);
6409 static void netif_free_tx_queues(struct net_device *dev)
6414 static int netif_alloc_netdev_queues(struct net_device *dev)
6416 unsigned int count = dev->num_tx_queues;
6417 struct netdev_queue *tx;
6418 size_t sz = count * sizeof(*tx);
6420 if (count < 1 || count > 0xffff)
6423 tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6431 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
6432 spin_lock_init(&dev->tx_global_lock);
6437 void netif_tx_stop_all_queues(struct net_device *dev)
6441 for (i = 0; i < dev->num_tx_queues; i++) {
6442 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
6443 netif_tx_stop_queue(txq);
6446 EXPORT_SYMBOL(netif_tx_stop_all_queues);
6449 * register_netdevice - register a network device
6450 * @dev: device to register
6452 * Take a completed network device structure and add it to the kernel
6453 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6454 * chain. 0 is returned on success. A negative errno code is returned
6455 * on a failure to set up the device, or if the name is a duplicate.
6457 * Callers must hold the rtnl semaphore. You may want
6458 * register_netdev() instead of this.
6461 * The locking appears insufficient to guarantee two parallel registers
6462 * will not get the same name.
6465 int register_netdevice(struct net_device *dev)
6468 struct net *net = dev_net(dev);
6470 BUG_ON(dev_boot_phase);
6475 /* When net_device's are persistent, this will be fatal. */
6476 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
6479 spin_lock_init(&dev->addr_list_lock);
6480 netdev_set_addr_lockdep_class(dev);
6482 ret = dev_get_valid_name(net, dev, dev->name);
6486 /* Init, if this function is available */
6487 if (dev->netdev_ops->ndo_init) {
6488 ret = dev->netdev_ops->ndo_init(dev);
6496 if (((dev->hw_features | dev->features) &
6497 NETIF_F_HW_VLAN_CTAG_FILTER) &&
6498 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
6499 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
6500 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
6507 dev->ifindex = dev_new_index(net);
6508 else if (__dev_get_by_index(net, dev->ifindex))
6511 /* Transfer changeable features to wanted_features and enable
6512 * software offloads (GSO and GRO).
6514 dev->hw_features |= NETIF_F_SOFT_FEATURES;
6515 dev->features |= NETIF_F_SOFT_FEATURES;
6516 dev->wanted_features = dev->features & dev->hw_features;
6518 if (!(dev->flags & IFF_LOOPBACK)) {
6519 dev->hw_features |= NETIF_F_NOCACHE_COPY;
6522 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6524 dev->vlan_features |= NETIF_F_HIGHDMA;
6526 /* Make NETIF_F_SG inheritable to tunnel devices.
6528 dev->hw_enc_features |= NETIF_F_SG;
6530 /* Make NETIF_F_SG inheritable to MPLS.
6532 dev->mpls_features |= NETIF_F_SG;
6534 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
6535 ret = notifier_to_errno(ret);
6539 ret = netdev_register_kobject(dev);
6542 dev->reg_state = NETREG_REGISTERED;
6544 __netdev_update_features(dev);
6547 * Default initial state at registry is that the
6548 * device is present.
6551 set_bit(__LINK_STATE_PRESENT, &dev->state);
6553 linkwatch_init_dev(dev);
6555 dev_init_scheduler(dev);
6557 list_netdevice(dev);
6558 add_device_randomness(dev->dev_addr, dev->addr_len);
6560 /* If the device has permanent device address, driver should
6561 * set dev_addr and also addr_assign_type should be set to
6562 * NET_ADDR_PERM (default value).
6564 if (dev->addr_assign_type == NET_ADDR_PERM)
6565 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
6567 /* Notify protocols, that a new device appeared. */
6568 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
6569 ret = notifier_to_errno(ret);
6571 rollback_registered(dev);
6572 dev->reg_state = NETREG_UNREGISTERED;
6575 * Prevent userspace races by waiting until the network
6576 * device is fully setup before sending notifications.
6578 if (!dev->rtnl_link_ops ||
6579 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6580 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
6586 if (dev->netdev_ops->ndo_uninit)
6587 dev->netdev_ops->ndo_uninit(dev);
6590 EXPORT_SYMBOL(register_netdevice);
6593 * init_dummy_netdev - init a dummy network device for NAPI
6594 * @dev: device to init
6596 * This takes a network device structure and initialize the minimum
6597 * amount of fields so it can be used to schedule NAPI polls without
6598 * registering a full blown interface. This is to be used by drivers
6599 * that need to tie several hardware interfaces to a single NAPI
6600 * poll scheduler due to HW limitations.
6602 int init_dummy_netdev(struct net_device *dev)
6604 /* Clear everything. Note we don't initialize spinlocks
6605 * are they aren't supposed to be taken by any of the
6606 * NAPI code and this dummy netdev is supposed to be
6607 * only ever used for NAPI polls
6609 memset(dev, 0, sizeof(struct net_device));
6611 /* make sure we BUG if trying to hit standard
6612 * register/unregister code path
6614 dev->reg_state = NETREG_DUMMY;
6616 /* NAPI wants this */
6617 INIT_LIST_HEAD(&dev->napi_list);
6619 /* a dummy interface is started by default */
6620 set_bit(__LINK_STATE_PRESENT, &dev->state);
6621 set_bit(__LINK_STATE_START, &dev->state);
6623 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6624 * because users of this 'device' dont need to change
6630 EXPORT_SYMBOL_GPL(init_dummy_netdev);
6634 * register_netdev - register a network device
6635 * @dev: device to register
6637 * Take a completed network device structure and add it to the kernel
6638 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6639 * chain. 0 is returned on success. A negative errno code is returned
6640 * on a failure to set up the device, or if the name is a duplicate.
6642 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6643 * and expands the device name if you passed a format string to
6646 int register_netdev(struct net_device *dev)
6651 err = register_netdevice(dev);
6655 EXPORT_SYMBOL(register_netdev);
6657 int netdev_refcnt_read(const struct net_device *dev)
6661 for_each_possible_cpu(i)
6662 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
6665 EXPORT_SYMBOL(netdev_refcnt_read);
6668 * netdev_wait_allrefs - wait until all references are gone.
6669 * @dev: target net_device
6671 * This is called when unregistering network devices.
6673 * Any protocol or device that holds a reference should register
6674 * for netdevice notification, and cleanup and put back the
6675 * reference if they receive an UNREGISTER event.
6676 * We can get stuck here if buggy protocols don't correctly
6679 static void netdev_wait_allrefs(struct net_device *dev)
6681 unsigned long rebroadcast_time, warning_time;
6684 linkwatch_forget_dev(dev);
6686 rebroadcast_time = warning_time = jiffies;
6687 refcnt = netdev_refcnt_read(dev);
6689 while (refcnt != 0) {
6690 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
6693 /* Rebroadcast unregister notification */
6694 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6700 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6701 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
6703 /* We must not have linkwatch events
6704 * pending on unregister. If this
6705 * happens, we simply run the queue
6706 * unscheduled, resulting in a noop
6709 linkwatch_run_queue();
6714 rebroadcast_time = jiffies;
6719 refcnt = netdev_refcnt_read(dev);
6721 if (time_after(jiffies, warning_time + 10 * HZ)) {
6722 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6724 warning_time = jiffies;
6733 * register_netdevice(x1);
6734 * register_netdevice(x2);
6736 * unregister_netdevice(y1);
6737 * unregister_netdevice(y2);
6743 * We are invoked by rtnl_unlock().
6744 * This allows us to deal with problems:
6745 * 1) We can delete sysfs objects which invoke hotplug
6746 * without deadlocking with linkwatch via keventd.
6747 * 2) Since we run with the RTNL semaphore not held, we can sleep
6748 * safely in order to wait for the netdev refcnt to drop to zero.
6750 * We must not return until all unregister events added during
6751 * the interval the lock was held have been completed.
6753 void netdev_run_todo(void)
6755 struct list_head list;
6757 /* Snapshot list, allow later requests */
6758 list_replace_init(&net_todo_list, &list);
6763 /* Wait for rcu callbacks to finish before next phase */
6764 if (!list_empty(&list))
6767 while (!list_empty(&list)) {
6768 struct net_device *dev
6769 = list_first_entry(&list, struct net_device, todo_list);
6770 list_del(&dev->todo_list);
6773 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6776 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
6777 pr_err("network todo '%s' but state %d\n",
6778 dev->name, dev->reg_state);
6783 dev->reg_state = NETREG_UNREGISTERED;
6785 netdev_wait_allrefs(dev);
6788 BUG_ON(netdev_refcnt_read(dev));
6789 BUG_ON(!list_empty(&dev->ptype_all));
6790 BUG_ON(!list_empty(&dev->ptype_specific));
6791 WARN_ON(rcu_access_pointer(dev->ip_ptr));
6792 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
6793 WARN_ON(dev->dn_ptr);
6795 if (dev->destructor)
6796 dev->destructor(dev);
6798 /* Report a network device has been unregistered */
6800 dev_net(dev)->dev_unreg_count--;
6802 wake_up(&netdev_unregistering_wq);
6804 /* Free network device */
6805 kobject_put(&dev->dev.kobj);
6809 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6810 * fields in the same order, with only the type differing.
6812 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
6813 const struct net_device_stats *netdev_stats)
6815 #if BITS_PER_LONG == 64
6816 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
6817 memcpy(stats64, netdev_stats, sizeof(*stats64));
6819 size_t i, n = sizeof(*stats64) / sizeof(u64);
6820 const unsigned long *src = (const unsigned long *)netdev_stats;
6821 u64 *dst = (u64 *)stats64;
6823 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
6824 sizeof(*stats64) / sizeof(u64));
6825 for (i = 0; i < n; i++)
6829 EXPORT_SYMBOL(netdev_stats_to_stats64);
6832 * dev_get_stats - get network device statistics
6833 * @dev: device to get statistics from
6834 * @storage: place to store stats
6836 * Get network statistics from device. Return @storage.
6837 * The device driver may provide its own method by setting
6838 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6839 * otherwise the internal statistics structure is used.
6841 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
6842 struct rtnl_link_stats64 *storage)
6844 const struct net_device_ops *ops = dev->netdev_ops;
6846 if (ops->ndo_get_stats64) {
6847 memset(storage, 0, sizeof(*storage));
6848 ops->ndo_get_stats64(dev, storage);
6849 } else if (ops->ndo_get_stats) {
6850 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
6852 netdev_stats_to_stats64(storage, &dev->stats);
6854 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
6855 storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
6858 EXPORT_SYMBOL(dev_get_stats);
6860 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
6862 struct netdev_queue *queue = dev_ingress_queue(dev);
6864 #ifdef CONFIG_NET_CLS_ACT
6867 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
6870 netdev_init_one_queue(dev, queue, NULL);
6871 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
6872 queue->qdisc_sleeping = &noop_qdisc;
6873 rcu_assign_pointer(dev->ingress_queue, queue);
6878 static const struct ethtool_ops default_ethtool_ops;
6880 void netdev_set_default_ethtool_ops(struct net_device *dev,
6881 const struct ethtool_ops *ops)
6883 if (dev->ethtool_ops == &default_ethtool_ops)
6884 dev->ethtool_ops = ops;
6886 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
6888 void netdev_freemem(struct net_device *dev)
6890 char *addr = (char *)dev - dev->padded;
6896 * alloc_netdev_mqs - allocate network device
6897 * @sizeof_priv: size of private data to allocate space for
6898 * @name: device name format string
6899 * @name_assign_type: origin of device name
6900 * @setup: callback to initialize device
6901 * @txqs: the number of TX subqueues to allocate
6902 * @rxqs: the number of RX subqueues to allocate
6904 * Allocates a struct net_device with private data area for driver use
6905 * and performs basic initialization. Also allocates subqueue structs
6906 * for each queue on the device.
6908 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
6909 unsigned char name_assign_type,
6910 void (*setup)(struct net_device *),
6911 unsigned int txqs, unsigned int rxqs)
6913 struct net_device *dev;
6915 struct net_device *p;
6917 BUG_ON(strlen(name) >= sizeof(dev->name));
6920 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6926 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6931 alloc_size = sizeof(struct net_device);
6933 /* ensure 32-byte alignment of private area */
6934 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6935 alloc_size += sizeof_priv;
6937 /* ensure 32-byte alignment of whole construct */
6938 alloc_size += NETDEV_ALIGN - 1;
6940 p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6942 p = vzalloc(alloc_size);
6946 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6947 dev->padded = (char *)dev - (char *)p;
6949 dev->pcpu_refcnt = alloc_percpu(int);
6950 if (!dev->pcpu_refcnt)
6953 if (dev_addr_init(dev))
6959 dev_net_set(dev, &init_net);
6961 dev->gso_max_size = GSO_MAX_SIZE;
6962 dev->gso_max_segs = GSO_MAX_SEGS;
6963 dev->gso_min_segs = 0;
6965 INIT_LIST_HEAD(&dev->napi_list);
6966 INIT_LIST_HEAD(&dev->unreg_list);
6967 INIT_LIST_HEAD(&dev->close_list);
6968 INIT_LIST_HEAD(&dev->link_watch_list);
6969 INIT_LIST_HEAD(&dev->adj_list.upper);
6970 INIT_LIST_HEAD(&dev->adj_list.lower);
6971 INIT_LIST_HEAD(&dev->all_adj_list.upper);
6972 INIT_LIST_HEAD(&dev->all_adj_list.lower);
6973 INIT_LIST_HEAD(&dev->ptype_all);
6974 INIT_LIST_HEAD(&dev->ptype_specific);
6975 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
6978 dev->num_tx_queues = txqs;
6979 dev->real_num_tx_queues = txqs;
6980 if (netif_alloc_netdev_queues(dev))
6984 dev->num_rx_queues = rxqs;
6985 dev->real_num_rx_queues = rxqs;
6986 if (netif_alloc_rx_queues(dev))
6990 strcpy(dev->name, name);
6991 dev->name_assign_type = name_assign_type;
6992 dev->group = INIT_NETDEV_GROUP;
6993 if (!dev->ethtool_ops)
6994 dev->ethtool_ops = &default_ethtool_ops;
6996 nf_hook_ingress_init(dev);
7005 free_percpu(dev->pcpu_refcnt);
7007 netdev_freemem(dev);
7010 EXPORT_SYMBOL(alloc_netdev_mqs);
7013 * free_netdev - free network device
7016 * This function does the last stage of destroying an allocated device
7017 * interface. The reference to the device object is released.
7018 * If this is the last reference then it will be freed.
7020 void free_netdev(struct net_device *dev)
7022 struct napi_struct *p, *n;
7024 netif_free_tx_queues(dev);
7029 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
7031 /* Flush device addresses */
7032 dev_addr_flush(dev);
7034 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
7037 free_percpu(dev->pcpu_refcnt);
7038 dev->pcpu_refcnt = NULL;
7040 /* Compatibility with error handling in drivers */
7041 if (dev->reg_state == NETREG_UNINITIALIZED) {
7042 netdev_freemem(dev);
7046 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
7047 dev->reg_state = NETREG_RELEASED;
7049 /* will free via device release */
7050 put_device(&dev->dev);
7052 EXPORT_SYMBOL(free_netdev);
7055 * synchronize_net - Synchronize with packet receive processing
7057 * Wait for packets currently being received to be done.
7058 * Does not block later packets from starting.
7060 void synchronize_net(void)
7063 if (rtnl_is_locked())
7064 synchronize_rcu_expedited();
7068 EXPORT_SYMBOL(synchronize_net);
7071 * unregister_netdevice_queue - remove device from the kernel
7075 * This function shuts down a device interface and removes it
7076 * from the kernel tables.
7077 * If head not NULL, device is queued to be unregistered later.
7079 * Callers must hold the rtnl semaphore. You may want
7080 * unregister_netdev() instead of this.
7083 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
7088 list_move_tail(&dev->unreg_list, head);
7090 rollback_registered(dev);
7091 /* Finish processing unregister after unlock */
7095 EXPORT_SYMBOL(unregister_netdevice_queue);
7098 * unregister_netdevice_many - unregister many devices
7099 * @head: list of devices
7101 * Note: As most callers use a stack allocated list_head,
7102 * we force a list_del() to make sure stack wont be corrupted later.
7104 void unregister_netdevice_many(struct list_head *head)
7106 struct net_device *dev;
7108 if (!list_empty(head)) {
7109 rollback_registered_many(head);
7110 list_for_each_entry(dev, head, unreg_list)
7115 EXPORT_SYMBOL(unregister_netdevice_many);
7118 * unregister_netdev - remove device from the kernel
7121 * This function shuts down a device interface and removes it
7122 * from the kernel tables.
7124 * This is just a wrapper for unregister_netdevice that takes
7125 * the rtnl semaphore. In general you want to use this and not
7126 * unregister_netdevice.
7128 void unregister_netdev(struct net_device *dev)
7131 unregister_netdevice(dev);
7134 EXPORT_SYMBOL(unregister_netdev);
7137 * dev_change_net_namespace - move device to different nethost namespace
7139 * @net: network namespace
7140 * @pat: If not NULL name pattern to try if the current device name
7141 * is already taken in the destination network namespace.
7143 * This function shuts down a device interface and moves it
7144 * to a new network namespace. On success 0 is returned, on
7145 * a failure a netagive errno code is returned.
7147 * Callers must hold the rtnl semaphore.
7150 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
7156 /* Don't allow namespace local devices to be moved. */
7158 if (dev->features & NETIF_F_NETNS_LOCAL)
7161 /* Ensure the device has been registrered */
7162 if (dev->reg_state != NETREG_REGISTERED)
7165 /* Get out if there is nothing todo */
7167 if (net_eq(dev_net(dev), net))
7170 /* Pick the destination device name, and ensure
7171 * we can use it in the destination network namespace.
7174 if (__dev_get_by_name(net, dev->name)) {
7175 /* We get here if we can't use the current device name */
7178 if (dev_get_valid_name(net, dev, pat) < 0)
7183 * And now a mini version of register_netdevice unregister_netdevice.
7186 /* If device is running close it first. */
7189 /* And unlink it from device chain */
7191 unlist_netdevice(dev);
7195 /* Shutdown queueing discipline. */
7198 /* Notify protocols, that we are about to destroy
7199 this device. They should clean all the things.
7201 Note that dev->reg_state stays at NETREG_REGISTERED.
7202 This is wanted because this way 8021q and macvlan know
7203 the device is just moving and can keep their slaves up.
7205 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
7207 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7208 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
7211 * Flush the unicast and multicast chains
7216 /* Send a netdev-removed uevent to the old namespace */
7217 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
7218 netdev_adjacent_del_links(dev);
7220 /* Actually switch the network namespace */
7221 dev_net_set(dev, net);
7223 /* If there is an ifindex conflict assign a new one */
7224 if (__dev_get_by_index(net, dev->ifindex))
7225 dev->ifindex = dev_new_index(net);
7227 /* Send a netdev-add uevent to the new namespace */
7228 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
7229 netdev_adjacent_add_links(dev);
7231 /* Fixup kobjects */
7232 err = device_rename(&dev->dev, dev->name);
7235 /* Add the device back in the hashes */
7236 list_netdevice(dev);
7238 /* Notify protocols, that a new device appeared. */
7239 call_netdevice_notifiers(NETDEV_REGISTER, dev);
7242 * Prevent userspace races by waiting until the network
7243 * device is fully setup before sending notifications.
7245 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
7252 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
7254 static int dev_cpu_callback(struct notifier_block *nfb,
7255 unsigned long action,
7258 struct sk_buff **list_skb;
7259 struct sk_buff *skb;
7260 unsigned int cpu, oldcpu = (unsigned long)ocpu;
7261 struct softnet_data *sd, *oldsd;
7263 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
7266 local_irq_disable();
7267 cpu = smp_processor_id();
7268 sd = &per_cpu(softnet_data, cpu);
7269 oldsd = &per_cpu(softnet_data, oldcpu);
7271 /* Find end of our completion_queue. */
7272 list_skb = &sd->completion_queue;
7274 list_skb = &(*list_skb)->next;
7275 /* Append completion queue from offline CPU. */
7276 *list_skb = oldsd->completion_queue;
7277 oldsd->completion_queue = NULL;
7279 /* Append output queue from offline CPU. */
7280 if (oldsd->output_queue) {
7281 *sd->output_queue_tailp = oldsd->output_queue;
7282 sd->output_queue_tailp = oldsd->output_queue_tailp;
7283 oldsd->output_queue = NULL;
7284 oldsd->output_queue_tailp = &oldsd->output_queue;
7286 /* Append NAPI poll list from offline CPU, with one exception :
7287 * process_backlog() must be called by cpu owning percpu backlog.
7288 * We properly handle process_queue & input_pkt_queue later.
7290 while (!list_empty(&oldsd->poll_list)) {
7291 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
7295 list_del_init(&napi->poll_list);
7296 if (napi->poll == process_backlog)
7299 ____napi_schedule(sd, napi);
7302 raise_softirq_irqoff(NET_TX_SOFTIRQ);
7305 /* Process offline CPU's input_pkt_queue */
7306 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
7308 input_queue_head_incr(oldsd);
7310 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
7312 input_queue_head_incr(oldsd);
7320 * netdev_increment_features - increment feature set by one
7321 * @all: current feature set
7322 * @one: new feature set
7323 * @mask: mask feature set
7325 * Computes a new feature set after adding a device with feature set
7326 * @one to the master device with current feature set @all. Will not
7327 * enable anything that is off in @mask. Returns the new feature set.
7329 netdev_features_t netdev_increment_features(netdev_features_t all,
7330 netdev_features_t one, netdev_features_t mask)
7332 if (mask & NETIF_F_GEN_CSUM)
7333 mask |= NETIF_F_ALL_CSUM;
7334 mask |= NETIF_F_VLAN_CHALLENGED;
7336 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
7337 all &= one | ~NETIF_F_ALL_FOR_ALL;
7339 /* If one device supports hw checksumming, set for all. */
7340 if (all & NETIF_F_GEN_CSUM)
7341 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
7345 EXPORT_SYMBOL(netdev_increment_features);
7347 static struct hlist_head * __net_init netdev_create_hash(void)
7350 struct hlist_head *hash;
7352 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
7354 for (i = 0; i < NETDEV_HASHENTRIES; i++)
7355 INIT_HLIST_HEAD(&hash[i]);
7360 /* Initialize per network namespace state */
7361 static int __net_init netdev_init(struct net *net)
7363 if (net != &init_net)
7364 INIT_LIST_HEAD(&net->dev_base_head);
7366 net->dev_name_head = netdev_create_hash();
7367 if (net->dev_name_head == NULL)
7370 net->dev_index_head = netdev_create_hash();
7371 if (net->dev_index_head == NULL)
7377 kfree(net->dev_name_head);
7383 * netdev_drivername - network driver for the device
7384 * @dev: network device
7386 * Determine network driver for device.
7388 const char *netdev_drivername(const struct net_device *dev)
7390 const struct device_driver *driver;
7391 const struct device *parent;
7392 const char *empty = "";
7394 parent = dev->dev.parent;
7398 driver = parent->driver;
7399 if (driver && driver->name)
7400 return driver->name;
7404 static void __netdev_printk(const char *level, const struct net_device *dev,
7405 struct va_format *vaf)
7407 if (dev && dev->dev.parent) {
7408 dev_printk_emit(level[1] - '0',
7411 dev_driver_string(dev->dev.parent),
7412 dev_name(dev->dev.parent),
7413 netdev_name(dev), netdev_reg_state(dev),
7416 printk("%s%s%s: %pV",
7417 level, netdev_name(dev), netdev_reg_state(dev), vaf);
7419 printk("%s(NULL net_device): %pV", level, vaf);
7423 void netdev_printk(const char *level, const struct net_device *dev,
7424 const char *format, ...)
7426 struct va_format vaf;
7429 va_start(args, format);
7434 __netdev_printk(level, dev, &vaf);
7438 EXPORT_SYMBOL(netdev_printk);
7440 #define define_netdev_printk_level(func, level) \
7441 void func(const struct net_device *dev, const char *fmt, ...) \
7443 struct va_format vaf; \
7446 va_start(args, fmt); \
7451 __netdev_printk(level, dev, &vaf); \
7455 EXPORT_SYMBOL(func);
7457 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
7458 define_netdev_printk_level(netdev_alert, KERN_ALERT);
7459 define_netdev_printk_level(netdev_crit, KERN_CRIT);
7460 define_netdev_printk_level(netdev_err, KERN_ERR);
7461 define_netdev_printk_level(netdev_warn, KERN_WARNING);
7462 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
7463 define_netdev_printk_level(netdev_info, KERN_INFO);
7465 static void __net_exit netdev_exit(struct net *net)
7467 kfree(net->dev_name_head);
7468 kfree(net->dev_index_head);
7471 static struct pernet_operations __net_initdata netdev_net_ops = {
7472 .init = netdev_init,
7473 .exit = netdev_exit,
7476 static void __net_exit default_device_exit(struct net *net)
7478 struct net_device *dev, *aux;
7480 * Push all migratable network devices back to the
7481 * initial network namespace
7484 for_each_netdev_safe(net, dev, aux) {
7486 char fb_name[IFNAMSIZ];
7488 /* Ignore unmoveable devices (i.e. loopback) */
7489 if (dev->features & NETIF_F_NETNS_LOCAL)
7492 /* Leave virtual devices for the generic cleanup */
7493 if (dev->rtnl_link_ops)
7496 /* Push remaining network devices to init_net */
7497 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
7498 err = dev_change_net_namespace(dev, &init_net, fb_name);
7500 pr_emerg("%s: failed to move %s to init_net: %d\n",
7501 __func__, dev->name, err);
7508 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
7510 /* Return with the rtnl_lock held when there are no network
7511 * devices unregistering in any network namespace in net_list.
7515 DEFINE_WAIT_FUNC(wait, woken_wake_function);
7517 add_wait_queue(&netdev_unregistering_wq, &wait);
7519 unregistering = false;
7521 list_for_each_entry(net, net_list, exit_list) {
7522 if (net->dev_unreg_count > 0) {
7523 unregistering = true;
7531 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
7533 remove_wait_queue(&netdev_unregistering_wq, &wait);
7536 static void __net_exit default_device_exit_batch(struct list_head *net_list)
7538 /* At exit all network devices most be removed from a network
7539 * namespace. Do this in the reverse order of registration.
7540 * Do this across as many network namespaces as possible to
7541 * improve batching efficiency.
7543 struct net_device *dev;
7545 LIST_HEAD(dev_kill_list);
7547 /* To prevent network device cleanup code from dereferencing
7548 * loopback devices or network devices that have been freed
7549 * wait here for all pending unregistrations to complete,
7550 * before unregistring the loopback device and allowing the
7551 * network namespace be freed.
7553 * The netdev todo list containing all network devices
7554 * unregistrations that happen in default_device_exit_batch
7555 * will run in the rtnl_unlock() at the end of
7556 * default_device_exit_batch.
7558 rtnl_lock_unregistering(net_list);
7559 list_for_each_entry(net, net_list, exit_list) {
7560 for_each_netdev_reverse(net, dev) {
7561 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
7562 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
7564 unregister_netdevice_queue(dev, &dev_kill_list);
7567 unregister_netdevice_many(&dev_kill_list);
7571 static struct pernet_operations __net_initdata default_device_ops = {
7572 .exit = default_device_exit,
7573 .exit_batch = default_device_exit_batch,
7577 * Initialize the DEV module. At boot time this walks the device list and
7578 * unhooks any devices that fail to initialise (normally hardware not
7579 * present) and leaves us with a valid list of present and active devices.
7584 * This is called single threaded during boot, so no need
7585 * to take the rtnl semaphore.
7587 static int __init net_dev_init(void)
7589 int i, rc = -ENOMEM;
7591 BUG_ON(!dev_boot_phase);
7593 if (dev_proc_init())
7596 if (netdev_kobject_init())
7599 INIT_LIST_HEAD(&ptype_all);
7600 for (i = 0; i < PTYPE_HASH_SIZE; i++)
7601 INIT_LIST_HEAD(&ptype_base[i]);
7603 INIT_LIST_HEAD(&offload_base);
7605 if (register_pernet_subsys(&netdev_net_ops))
7609 * Initialise the packet receive queues.
7612 for_each_possible_cpu(i) {
7613 struct softnet_data *sd = &per_cpu(softnet_data, i);
7615 skb_queue_head_init(&sd->input_pkt_queue);
7616 skb_queue_head_init(&sd->process_queue);
7617 INIT_LIST_HEAD(&sd->poll_list);
7618 sd->output_queue_tailp = &sd->output_queue;
7620 sd->csd.func = rps_trigger_softirq;
7625 sd->backlog.poll = process_backlog;
7626 sd->backlog.weight = weight_p;
7631 /* The loopback device is special if any other network devices
7632 * is present in a network namespace the loopback device must
7633 * be present. Since we now dynamically allocate and free the
7634 * loopback device ensure this invariant is maintained by
7635 * keeping the loopback device as the first device on the
7636 * list of network devices. Ensuring the loopback devices
7637 * is the first device that appears and the last network device
7640 if (register_pernet_device(&loopback_net_ops))
7643 if (register_pernet_device(&default_device_ops))
7646 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
7647 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
7649 hotcpu_notifier(dev_cpu_callback, 0);
7656 subsys_initcall(net_dev_init);