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 <linux/ipv6.h>
122 #include <linux/in.h>
123 #include <linux/jhash.h>
124 #include <linux/random.h>
125 #include <trace/events/napi.h>
126 #include <trace/events/net.h>
127 #include <trace/events/skb.h>
128 #include <linux/pci.h>
129 #include <linux/inetdevice.h>
130 #include <linux/cpu_rmap.h>
131 #include <linux/static_key.h>
132 #include <linux/hashtable.h>
133 #include <linux/vmalloc.h>
134 #include <linux/if_macvlan.h>
135 #include <linux/errqueue.h>
137 #include "net-sysfs.h"
139 /* Instead of increasing this, you should create a hash table. */
140 #define MAX_GRO_SKBS 8
142 /* This should be increased if a protocol with a bigger head is added. */
143 #define GRO_MAX_HEAD (MAX_HEADER + 128)
145 static DEFINE_SPINLOCK(ptype_lock);
146 static DEFINE_SPINLOCK(offload_lock);
147 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
148 struct list_head ptype_all __read_mostly; /* Taps */
149 static struct list_head offload_base __read_mostly;
151 static int netif_rx_internal(struct sk_buff *skb);
152 static int call_netdevice_notifiers_info(unsigned long val,
153 struct net_device *dev,
154 struct netdev_notifier_info *info);
157 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
160 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
162 * Writers must hold the rtnl semaphore while they loop through the
163 * dev_base_head list, and hold dev_base_lock for writing when they do the
164 * actual updates. This allows pure readers to access the list even
165 * while a writer is preparing to update it.
167 * To put it another way, dev_base_lock is held for writing only to
168 * protect against pure readers; the rtnl semaphore provides the
169 * protection against other writers.
171 * See, for example usages, register_netdevice() and
172 * unregister_netdevice(), which must be called with the rtnl
175 DEFINE_RWLOCK(dev_base_lock);
176 EXPORT_SYMBOL(dev_base_lock);
178 /* protects napi_hash addition/deletion and napi_gen_id */
179 static DEFINE_SPINLOCK(napi_hash_lock);
181 static unsigned int napi_gen_id;
182 static DEFINE_HASHTABLE(napi_hash, 8);
184 static seqcount_t devnet_rename_seq;
186 static inline void dev_base_seq_inc(struct net *net)
188 while (++net->dev_base_seq == 0);
191 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
193 unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
195 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
198 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
200 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
203 static inline void rps_lock(struct softnet_data *sd)
206 spin_lock(&sd->input_pkt_queue.lock);
210 static inline void rps_unlock(struct softnet_data *sd)
213 spin_unlock(&sd->input_pkt_queue.lock);
217 /* Device list insertion */
218 static void list_netdevice(struct net_device *dev)
220 struct net *net = dev_net(dev);
224 write_lock_bh(&dev_base_lock);
225 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
226 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
227 hlist_add_head_rcu(&dev->index_hlist,
228 dev_index_hash(net, dev->ifindex));
229 write_unlock_bh(&dev_base_lock);
231 dev_base_seq_inc(net);
234 /* Device list removal
235 * caller must respect a RCU grace period before freeing/reusing dev
237 static void unlist_netdevice(struct net_device *dev)
241 /* Unlink dev from the device chain */
242 write_lock_bh(&dev_base_lock);
243 list_del_rcu(&dev->dev_list);
244 hlist_del_rcu(&dev->name_hlist);
245 hlist_del_rcu(&dev->index_hlist);
246 write_unlock_bh(&dev_base_lock);
248 dev_base_seq_inc(dev_net(dev));
255 static RAW_NOTIFIER_HEAD(netdev_chain);
258 * Device drivers call our routines to queue packets here. We empty the
259 * queue in the local softnet handler.
262 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
263 EXPORT_PER_CPU_SYMBOL(softnet_data);
265 #ifdef CONFIG_LOCKDEP
267 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
268 * according to dev->type
270 static const unsigned short netdev_lock_type[] =
271 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
272 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
273 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
274 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
275 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
276 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
277 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
278 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
279 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
280 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
281 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
282 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
283 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
284 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
285 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
287 static const char *const netdev_lock_name[] =
288 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
289 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
290 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
291 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
292 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
293 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
294 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
295 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
296 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
297 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
298 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
299 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
300 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
301 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
302 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
304 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
305 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
307 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
311 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
312 if (netdev_lock_type[i] == dev_type)
314 /* the last key is used by default */
315 return ARRAY_SIZE(netdev_lock_type) - 1;
318 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
319 unsigned short dev_type)
323 i = netdev_lock_pos(dev_type);
324 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
325 netdev_lock_name[i]);
328 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
332 i = netdev_lock_pos(dev->type);
333 lockdep_set_class_and_name(&dev->addr_list_lock,
334 &netdev_addr_lock_key[i],
335 netdev_lock_name[i]);
338 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
339 unsigned short dev_type)
342 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
347 /*******************************************************************************
349 Protocol management and registration routines
351 *******************************************************************************/
354 * Add a protocol ID to the list. Now that the input handler is
355 * smarter we can dispense with all the messy stuff that used to be
358 * BEWARE!!! Protocol handlers, mangling input packets,
359 * MUST BE last in hash buckets and checking protocol handlers
360 * MUST start from promiscuous ptype_all chain in net_bh.
361 * It is true now, do not change it.
362 * Explanation follows: if protocol handler, mangling packet, will
363 * be the first on list, it is not able to sense, that packet
364 * is cloned and should be copied-on-write, so that it will
365 * change it and subsequent readers will get broken packet.
369 static inline struct list_head *ptype_head(const struct packet_type *pt)
371 if (pt->type == htons(ETH_P_ALL))
374 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
378 * dev_add_pack - add packet handler
379 * @pt: packet type declaration
381 * Add a protocol handler to the networking stack. The passed &packet_type
382 * is linked into kernel lists and may not be freed until it has been
383 * removed from the kernel lists.
385 * This call does not sleep therefore it can not
386 * guarantee all CPU's that are in middle of receiving packets
387 * will see the new packet type (until the next received packet).
390 void dev_add_pack(struct packet_type *pt)
392 struct list_head *head = ptype_head(pt);
394 spin_lock(&ptype_lock);
395 list_add_rcu(&pt->list, head);
396 spin_unlock(&ptype_lock);
398 EXPORT_SYMBOL(dev_add_pack);
401 * __dev_remove_pack - remove packet handler
402 * @pt: packet type declaration
404 * Remove a protocol handler that was previously added to the kernel
405 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
406 * from the kernel lists and can be freed or reused once this function
409 * The packet type might still be in use by receivers
410 * and must not be freed until after all the CPU's have gone
411 * through a quiescent state.
413 void __dev_remove_pack(struct packet_type *pt)
415 struct list_head *head = ptype_head(pt);
416 struct packet_type *pt1;
418 spin_lock(&ptype_lock);
420 list_for_each_entry(pt1, head, list) {
422 list_del_rcu(&pt->list);
427 pr_warn("dev_remove_pack: %p not found\n", pt);
429 spin_unlock(&ptype_lock);
431 EXPORT_SYMBOL(__dev_remove_pack);
434 * dev_remove_pack - remove packet handler
435 * @pt: packet type declaration
437 * Remove a protocol handler that was previously added to the kernel
438 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
439 * from the kernel lists and can be freed or reused once this function
442 * This call sleeps to guarantee that no CPU is looking at the packet
445 void dev_remove_pack(struct packet_type *pt)
447 __dev_remove_pack(pt);
451 EXPORT_SYMBOL(dev_remove_pack);
455 * dev_add_offload - register offload handlers
456 * @po: protocol offload declaration
458 * Add protocol offload handlers to the networking stack. The passed
459 * &proto_offload is linked into kernel lists and may not be freed until
460 * it has been removed from the kernel lists.
462 * This call does not sleep therefore it can not
463 * guarantee all CPU's that are in middle of receiving packets
464 * will see the new offload handlers (until the next received packet).
466 void dev_add_offload(struct packet_offload *po)
468 struct list_head *head = &offload_base;
470 spin_lock(&offload_lock);
471 list_add_rcu(&po->list, head);
472 spin_unlock(&offload_lock);
474 EXPORT_SYMBOL(dev_add_offload);
477 * __dev_remove_offload - remove offload handler
478 * @po: packet offload declaration
480 * Remove a protocol offload handler that was previously added to the
481 * kernel offload handlers by dev_add_offload(). The passed &offload_type
482 * is removed from the kernel lists and can be freed or reused once this
485 * The packet type might still be in use by receivers
486 * and must not be freed until after all the CPU's have gone
487 * through a quiescent state.
489 static void __dev_remove_offload(struct packet_offload *po)
491 struct list_head *head = &offload_base;
492 struct packet_offload *po1;
494 spin_lock(&offload_lock);
496 list_for_each_entry(po1, head, list) {
498 list_del_rcu(&po->list);
503 pr_warn("dev_remove_offload: %p not found\n", po);
505 spin_unlock(&offload_lock);
509 * dev_remove_offload - remove packet offload handler
510 * @po: packet offload declaration
512 * Remove a packet offload handler that was previously added to the kernel
513 * offload handlers by dev_add_offload(). The passed &offload_type is
514 * removed from the kernel lists and can be freed or reused once this
517 * This call sleeps to guarantee that no CPU is looking at the packet
520 void dev_remove_offload(struct packet_offload *po)
522 __dev_remove_offload(po);
526 EXPORT_SYMBOL(dev_remove_offload);
528 /******************************************************************************
530 Device Boot-time Settings Routines
532 *******************************************************************************/
534 /* Boot time configuration table */
535 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
538 * netdev_boot_setup_add - add new setup entry
539 * @name: name of the device
540 * @map: configured settings for the device
542 * Adds new setup entry to the dev_boot_setup list. The function
543 * returns 0 on error and 1 on success. This is a generic routine to
546 static int netdev_boot_setup_add(char *name, struct ifmap *map)
548 struct netdev_boot_setup *s;
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
553 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
554 memset(s[i].name, 0, sizeof(s[i].name));
555 strlcpy(s[i].name, name, IFNAMSIZ);
556 memcpy(&s[i].map, map, sizeof(s[i].map));
561 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
565 * netdev_boot_setup_check - check boot time settings
566 * @dev: the netdevice
568 * Check boot time settings for the device.
569 * The found settings are set for the device to be used
570 * later in the device probing.
571 * Returns 0 if no settings found, 1 if they are.
573 int netdev_boot_setup_check(struct net_device *dev)
575 struct netdev_boot_setup *s = dev_boot_setup;
578 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
579 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
580 !strcmp(dev->name, s[i].name)) {
581 dev->irq = s[i].map.irq;
582 dev->base_addr = s[i].map.base_addr;
583 dev->mem_start = s[i].map.mem_start;
584 dev->mem_end = s[i].map.mem_end;
590 EXPORT_SYMBOL(netdev_boot_setup_check);
594 * netdev_boot_base - get address from boot time settings
595 * @prefix: prefix for network device
596 * @unit: id for network device
598 * Check boot time settings for the base address of device.
599 * The found settings are set for the device to be used
600 * later in the device probing.
601 * Returns 0 if no settings found.
603 unsigned long netdev_boot_base(const char *prefix, int unit)
605 const struct netdev_boot_setup *s = dev_boot_setup;
609 sprintf(name, "%s%d", prefix, unit);
612 * If device already registered then return base of 1
613 * to indicate not to probe for this interface
615 if (__dev_get_by_name(&init_net, name))
618 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
619 if (!strcmp(name, s[i].name))
620 return s[i].map.base_addr;
625 * Saves at boot time configured settings for any netdevice.
627 int __init netdev_boot_setup(char *str)
632 str = get_options(str, ARRAY_SIZE(ints), ints);
637 memset(&map, 0, sizeof(map));
641 map.base_addr = ints[2];
643 map.mem_start = ints[3];
645 map.mem_end = ints[4];
647 /* Add new entry to the list */
648 return netdev_boot_setup_add(str, &map);
651 __setup("netdev=", netdev_boot_setup);
653 /*******************************************************************************
655 Device Interface Subroutines
657 *******************************************************************************/
660 * __dev_get_by_name - find a device by its name
661 * @net: the applicable net namespace
662 * @name: name to find
664 * Find an interface by name. Must be called under RTNL semaphore
665 * or @dev_base_lock. If the name is found a pointer to the device
666 * is returned. If the name is not found then %NULL is returned. The
667 * reference counters are not incremented so the caller must be
668 * careful with locks.
671 struct net_device *__dev_get_by_name(struct net *net, const char *name)
673 struct net_device *dev;
674 struct hlist_head *head = dev_name_hash(net, name);
676 hlist_for_each_entry(dev, head, name_hlist)
677 if (!strncmp(dev->name, name, IFNAMSIZ))
682 EXPORT_SYMBOL(__dev_get_by_name);
685 * dev_get_by_name_rcu - find a device by its name
686 * @net: the applicable net namespace
687 * @name: name to find
689 * Find an interface by name.
690 * If the name is found a pointer to the device is returned.
691 * If the name is not found then %NULL is returned.
692 * The reference counters are not incremented so the caller must be
693 * careful with locks. The caller must hold RCU lock.
696 struct net_device *dev_get_by_name_rcu(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_rcu(dev, head, name_hlist)
702 if (!strncmp(dev->name, name, IFNAMSIZ))
707 EXPORT_SYMBOL(dev_get_by_name_rcu);
710 * dev_get_by_name - find a device by its name
711 * @net: the applicable net namespace
712 * @name: name to find
714 * Find an interface by name. This can be called from any
715 * context and does its own locking. The returned handle has
716 * the usage count incremented and the caller must use dev_put() to
717 * release it when it is no longer needed. %NULL is returned if no
718 * matching device is found.
721 struct net_device *dev_get_by_name(struct net *net, const char *name)
723 struct net_device *dev;
726 dev = dev_get_by_name_rcu(net, name);
732 EXPORT_SYMBOL(dev_get_by_name);
735 * __dev_get_by_index - find a device by its ifindex
736 * @net: the applicable net namespace
737 * @ifindex: index of device
739 * Search for an interface by index. Returns %NULL if the device
740 * is not found or a pointer to the device. The device has not
741 * had its reference counter increased so the caller must be careful
742 * about locking. The caller must hold either the RTNL semaphore
746 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
748 struct net_device *dev;
749 struct hlist_head *head = dev_index_hash(net, ifindex);
751 hlist_for_each_entry(dev, head, index_hlist)
752 if (dev->ifindex == ifindex)
757 EXPORT_SYMBOL(__dev_get_by_index);
760 * dev_get_by_index_rcu - 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 RCU lock.
770 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
772 struct net_device *dev;
773 struct hlist_head *head = dev_index_hash(net, ifindex);
775 hlist_for_each_entry_rcu(dev, head, index_hlist)
776 if (dev->ifindex == ifindex)
781 EXPORT_SYMBOL(dev_get_by_index_rcu);
785 * dev_get_by_index - 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 returned has
791 * had a reference added and the pointer is safe until the user calls
792 * dev_put to indicate they have finished with it.
795 struct net_device *dev_get_by_index(struct net *net, int ifindex)
797 struct net_device *dev;
800 dev = dev_get_by_index_rcu(net, ifindex);
806 EXPORT_SYMBOL(dev_get_by_index);
809 * netdev_get_name - get a netdevice name, knowing its ifindex.
810 * @net: network namespace
811 * @name: a pointer to the buffer where the name will be stored.
812 * @ifindex: the ifindex of the interface to get the name from.
814 * The use of raw_seqcount_begin() and cond_resched() before
815 * retrying is required as we want to give the writers a chance
816 * to complete when CONFIG_PREEMPT is not set.
818 int netdev_get_name(struct net *net, char *name, int ifindex)
820 struct net_device *dev;
824 seq = raw_seqcount_begin(&devnet_rename_seq);
826 dev = dev_get_by_index_rcu(net, ifindex);
832 strcpy(name, dev->name);
834 if (read_seqcount_retry(&devnet_rename_seq, seq)) {
843 * dev_getbyhwaddr_rcu - find a device by its hardware address
844 * @net: the applicable net namespace
845 * @type: media type of device
846 * @ha: hardware address
848 * Search for an interface by MAC address. Returns NULL if the device
849 * is not found or a pointer to the device.
850 * The caller must hold RCU or RTNL.
851 * The returned device has not had its ref count increased
852 * and the caller must therefore be careful about locking
856 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
859 struct net_device *dev;
861 for_each_netdev_rcu(net, dev)
862 if (dev->type == type &&
863 !memcmp(dev->dev_addr, ha, dev->addr_len))
868 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
870 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
872 struct net_device *dev;
875 for_each_netdev(net, dev)
876 if (dev->type == type)
881 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
883 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
885 struct net_device *dev, *ret = NULL;
888 for_each_netdev_rcu(net, dev)
889 if (dev->type == type) {
897 EXPORT_SYMBOL(dev_getfirstbyhwtype);
900 * dev_get_by_flags_rcu - find any device with given flags
901 * @net: the applicable net namespace
902 * @if_flags: IFF_* values
903 * @mask: bitmask of bits in if_flags to check
905 * Search for any interface with the given flags. Returns NULL if a device
906 * is not found or a pointer to the device. Must be called inside
907 * rcu_read_lock(), and result refcount is unchanged.
910 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
913 struct net_device *dev, *ret;
916 for_each_netdev_rcu(net, dev) {
917 if (((dev->flags ^ if_flags) & mask) == 0) {
924 EXPORT_SYMBOL(dev_get_by_flags_rcu);
927 * dev_valid_name - check if name is okay for network device
930 * Network device names need to be valid file names to
931 * to allow sysfs to work. We also disallow any kind of
934 bool dev_valid_name(const char *name)
938 if (strlen(name) >= IFNAMSIZ)
940 if (!strcmp(name, ".") || !strcmp(name, ".."))
944 if (*name == '/' || isspace(*name))
950 EXPORT_SYMBOL(dev_valid_name);
953 * __dev_alloc_name - allocate a name for a device
954 * @net: network namespace to allocate the device name in
955 * @name: name format string
956 * @buf: scratch buffer and result name string
958 * Passed a format string - eg "lt%d" it will try and find a suitable
959 * id. It scans list of devices to build up a free map, then chooses
960 * the first empty slot. The caller must hold the dev_base or rtnl lock
961 * while allocating the name and adding the device in order to avoid
963 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
964 * Returns the number of the unit assigned or a negative errno code.
967 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
971 const int max_netdevices = 8*PAGE_SIZE;
972 unsigned long *inuse;
973 struct net_device *d;
975 p = strnchr(name, IFNAMSIZ-1, '%');
978 * Verify the string as this thing may have come from
979 * the user. There must be either one "%d" and no other "%"
982 if (p[1] != 'd' || strchr(p + 2, '%'))
985 /* Use one page as a bit array of possible slots */
986 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
990 for_each_netdev(net, d) {
991 if (!sscanf(d->name, name, &i))
993 if (i < 0 || i >= max_netdevices)
996 /* avoid cases where sscanf is not exact inverse of printf */
997 snprintf(buf, IFNAMSIZ, name, i);
998 if (!strncmp(buf, d->name, IFNAMSIZ))
1002 i = find_first_zero_bit(inuse, max_netdevices);
1003 free_page((unsigned long) inuse);
1007 snprintf(buf, IFNAMSIZ, name, i);
1008 if (!__dev_get_by_name(net, buf))
1011 /* It is possible to run out of possible slots
1012 * when the name is long and there isn't enough space left
1013 * for the digits, or if all bits are used.
1019 * dev_alloc_name - allocate a name for a device
1021 * @name: name format string
1023 * Passed a format string - eg "lt%d" it will try and find a suitable
1024 * id. It scans list of devices to build up a free map, then chooses
1025 * the first empty slot. The caller must hold the dev_base or rtnl lock
1026 * while allocating the name and adding the device in order to avoid
1028 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1029 * Returns the number of the unit assigned or a negative errno code.
1032 int dev_alloc_name(struct net_device *dev, const char *name)
1038 BUG_ON(!dev_net(dev));
1040 ret = __dev_alloc_name(net, name, buf);
1042 strlcpy(dev->name, buf, IFNAMSIZ);
1045 EXPORT_SYMBOL(dev_alloc_name);
1047 static int dev_alloc_name_ns(struct net *net,
1048 struct net_device *dev,
1054 ret = __dev_alloc_name(net, name, buf);
1056 strlcpy(dev->name, buf, IFNAMSIZ);
1060 static int dev_get_valid_name(struct net *net,
1061 struct net_device *dev,
1066 if (!dev_valid_name(name))
1069 if (strchr(name, '%'))
1070 return dev_alloc_name_ns(net, dev, name);
1071 else if (__dev_get_by_name(net, name))
1073 else if (dev->name != name)
1074 strlcpy(dev->name, name, IFNAMSIZ);
1080 * dev_change_name - change name of a device
1082 * @newname: name (or format string) must be at least IFNAMSIZ
1084 * Change name of a device, can pass format strings "eth%d".
1087 int dev_change_name(struct net_device *dev, const char *newname)
1089 unsigned char old_assign_type;
1090 char oldname[IFNAMSIZ];
1096 BUG_ON(!dev_net(dev));
1099 if (dev->flags & IFF_UP)
1102 write_seqcount_begin(&devnet_rename_seq);
1104 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1105 write_seqcount_end(&devnet_rename_seq);
1109 memcpy(oldname, dev->name, IFNAMSIZ);
1111 err = dev_get_valid_name(net, dev, newname);
1113 write_seqcount_end(&devnet_rename_seq);
1117 if (oldname[0] && !strchr(oldname, '%'))
1118 netdev_info(dev, "renamed from %s\n", oldname);
1120 old_assign_type = dev->name_assign_type;
1121 dev->name_assign_type = NET_NAME_RENAMED;
1124 ret = device_rename(&dev->dev, dev->name);
1126 memcpy(dev->name, oldname, IFNAMSIZ);
1127 dev->name_assign_type = old_assign_type;
1128 write_seqcount_end(&devnet_rename_seq);
1132 write_seqcount_end(&devnet_rename_seq);
1134 netdev_adjacent_rename_links(dev, oldname);
1136 write_lock_bh(&dev_base_lock);
1137 hlist_del_rcu(&dev->name_hlist);
1138 write_unlock_bh(&dev_base_lock);
1142 write_lock_bh(&dev_base_lock);
1143 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1144 write_unlock_bh(&dev_base_lock);
1146 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1147 ret = notifier_to_errno(ret);
1150 /* err >= 0 after dev_alloc_name() or stores the first errno */
1153 write_seqcount_begin(&devnet_rename_seq);
1154 memcpy(dev->name, oldname, IFNAMSIZ);
1155 memcpy(oldname, newname, IFNAMSIZ);
1156 dev->name_assign_type = old_assign_type;
1157 old_assign_type = NET_NAME_RENAMED;
1160 pr_err("%s: name change rollback failed: %d\n",
1169 * dev_set_alias - change ifalias of a device
1171 * @alias: name up to IFALIASZ
1172 * @len: limit of bytes to copy from info
1174 * Set ifalias for a device,
1176 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1182 if (len >= IFALIASZ)
1186 kfree(dev->ifalias);
1187 dev->ifalias = NULL;
1191 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1194 dev->ifalias = new_ifalias;
1196 strlcpy(dev->ifalias, alias, len+1);
1202 * netdev_features_change - device changes features
1203 * @dev: device to cause notification
1205 * Called to indicate a device has changed features.
1207 void netdev_features_change(struct net_device *dev)
1209 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1211 EXPORT_SYMBOL(netdev_features_change);
1214 * netdev_state_change - device changes state
1215 * @dev: device to cause notification
1217 * Called to indicate a device has changed state. This function calls
1218 * the notifier chains for netdev_chain and sends a NEWLINK message
1219 * to the routing socket.
1221 void netdev_state_change(struct net_device *dev)
1223 if (dev->flags & IFF_UP) {
1224 struct netdev_notifier_change_info change_info;
1226 change_info.flags_changed = 0;
1227 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
1229 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1232 EXPORT_SYMBOL(netdev_state_change);
1235 * netdev_notify_peers - notify network peers about existence of @dev
1236 * @dev: network device
1238 * Generate traffic such that interested network peers are aware of
1239 * @dev, such as by generating a gratuitous ARP. This may be used when
1240 * a device wants to inform the rest of the network about some sort of
1241 * reconfiguration such as a failover event or virtual machine
1244 void netdev_notify_peers(struct net_device *dev)
1247 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1250 EXPORT_SYMBOL(netdev_notify_peers);
1252 static int __dev_open(struct net_device *dev)
1254 const struct net_device_ops *ops = dev->netdev_ops;
1259 if (!netif_device_present(dev))
1262 /* Block netpoll from trying to do any rx path servicing.
1263 * If we don't do this there is a chance ndo_poll_controller
1264 * or ndo_poll may be running while we open the device
1266 netpoll_poll_disable(dev);
1268 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1269 ret = notifier_to_errno(ret);
1273 set_bit(__LINK_STATE_START, &dev->state);
1275 if (ops->ndo_validate_addr)
1276 ret = ops->ndo_validate_addr(dev);
1278 if (!ret && ops->ndo_open)
1279 ret = ops->ndo_open(dev);
1281 netpoll_poll_enable(dev);
1284 clear_bit(__LINK_STATE_START, &dev->state);
1286 dev->flags |= IFF_UP;
1287 net_dmaengine_get();
1288 dev_set_rx_mode(dev);
1290 add_device_randomness(dev->dev_addr, dev->addr_len);
1297 * dev_open - prepare an interface for use.
1298 * @dev: device to open
1300 * Takes a device from down to up state. The device's private open
1301 * function is invoked and then the multicast lists are loaded. Finally
1302 * the device is moved into the up state and a %NETDEV_UP message is
1303 * sent to the netdev notifier chain.
1305 * Calling this function on an active interface is a nop. On a failure
1306 * a negative errno code is returned.
1308 int dev_open(struct net_device *dev)
1312 if (dev->flags & IFF_UP)
1315 ret = __dev_open(dev);
1319 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1320 call_netdevice_notifiers(NETDEV_UP, dev);
1324 EXPORT_SYMBOL(dev_open);
1326 static int __dev_close_many(struct list_head *head)
1328 struct net_device *dev;
1333 list_for_each_entry(dev, head, close_list) {
1334 /* Temporarily disable netpoll until the interface is down */
1335 netpoll_poll_disable(dev);
1337 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1339 clear_bit(__LINK_STATE_START, &dev->state);
1341 /* Synchronize to scheduled poll. We cannot touch poll list, it
1342 * can be even on different cpu. So just clear netif_running().
1344 * dev->stop() will invoke napi_disable() on all of it's
1345 * napi_struct instances on this device.
1347 smp_mb__after_atomic(); /* Commit netif_running(). */
1350 dev_deactivate_many(head);
1352 list_for_each_entry(dev, head, close_list) {
1353 const struct net_device_ops *ops = dev->netdev_ops;
1356 * Call the device specific close. This cannot fail.
1357 * Only if device is UP
1359 * We allow it to be called even after a DETACH hot-plug
1365 dev->flags &= ~IFF_UP;
1366 net_dmaengine_put();
1367 netpoll_poll_enable(dev);
1373 static int __dev_close(struct net_device *dev)
1378 list_add(&dev->close_list, &single);
1379 retval = __dev_close_many(&single);
1385 static int dev_close_many(struct list_head *head)
1387 struct net_device *dev, *tmp;
1389 /* Remove the devices that don't need to be closed */
1390 list_for_each_entry_safe(dev, tmp, head, close_list)
1391 if (!(dev->flags & IFF_UP))
1392 list_del_init(&dev->close_list);
1394 __dev_close_many(head);
1396 list_for_each_entry_safe(dev, tmp, head, close_list) {
1397 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1398 call_netdevice_notifiers(NETDEV_DOWN, dev);
1399 list_del_init(&dev->close_list);
1406 * dev_close - shutdown an interface.
1407 * @dev: device to shutdown
1409 * This function moves an active device into down state. A
1410 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1411 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1414 int dev_close(struct net_device *dev)
1416 if (dev->flags & IFF_UP) {
1419 list_add(&dev->close_list, &single);
1420 dev_close_many(&single);
1425 EXPORT_SYMBOL(dev_close);
1429 * dev_disable_lro - disable Large Receive Offload on a device
1432 * Disable Large Receive Offload (LRO) on a net device. Must be
1433 * called under RTNL. This is needed if received packets may be
1434 * forwarded to another interface.
1436 void dev_disable_lro(struct net_device *dev)
1439 * If we're trying to disable lro on a vlan device
1440 * use the underlying physical device instead
1442 if (is_vlan_dev(dev))
1443 dev = vlan_dev_real_dev(dev);
1445 /* the same for macvlan devices */
1446 if (netif_is_macvlan(dev))
1447 dev = macvlan_dev_real_dev(dev);
1449 dev->wanted_features &= ~NETIF_F_LRO;
1450 netdev_update_features(dev);
1452 if (unlikely(dev->features & NETIF_F_LRO))
1453 netdev_WARN(dev, "failed to disable LRO!\n");
1455 EXPORT_SYMBOL(dev_disable_lro);
1457 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1458 struct net_device *dev)
1460 struct netdev_notifier_info info;
1462 netdev_notifier_info_init(&info, dev);
1463 return nb->notifier_call(nb, val, &info);
1466 static int dev_boot_phase = 1;
1469 * register_netdevice_notifier - register a network notifier block
1472 * Register a notifier to be called when network device events occur.
1473 * The notifier passed is linked into the kernel structures and must
1474 * not be reused until it has been unregistered. A negative errno code
1475 * is returned on a failure.
1477 * When registered all registration and up events are replayed
1478 * to the new notifier to allow device to have a race free
1479 * view of the network device list.
1482 int register_netdevice_notifier(struct notifier_block *nb)
1484 struct net_device *dev;
1485 struct net_device *last;
1490 err = raw_notifier_chain_register(&netdev_chain, nb);
1496 for_each_netdev(net, dev) {
1497 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1498 err = notifier_to_errno(err);
1502 if (!(dev->flags & IFF_UP))
1505 call_netdevice_notifier(nb, NETDEV_UP, dev);
1516 for_each_netdev(net, dev) {
1520 if (dev->flags & IFF_UP) {
1521 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1523 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1525 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1530 raw_notifier_chain_unregister(&netdev_chain, nb);
1533 EXPORT_SYMBOL(register_netdevice_notifier);
1536 * unregister_netdevice_notifier - unregister a network notifier block
1539 * Unregister a notifier previously registered by
1540 * register_netdevice_notifier(). The notifier is unlinked into the
1541 * kernel structures and may then be reused. A negative errno code
1542 * is returned on a failure.
1544 * After unregistering unregister and down device events are synthesized
1545 * for all devices on the device list to the removed notifier to remove
1546 * the need for special case cleanup code.
1549 int unregister_netdevice_notifier(struct notifier_block *nb)
1551 struct net_device *dev;
1556 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1561 for_each_netdev(net, dev) {
1562 if (dev->flags & IFF_UP) {
1563 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1565 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1567 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1574 EXPORT_SYMBOL(unregister_netdevice_notifier);
1577 * call_netdevice_notifiers_info - call all network notifier blocks
1578 * @val: value passed unmodified to notifier function
1579 * @dev: net_device pointer passed unmodified to notifier function
1580 * @info: notifier information data
1582 * Call all network notifier blocks. Parameters and return value
1583 * are as for raw_notifier_call_chain().
1586 static int call_netdevice_notifiers_info(unsigned long val,
1587 struct net_device *dev,
1588 struct netdev_notifier_info *info)
1591 netdev_notifier_info_init(info, dev);
1592 return raw_notifier_call_chain(&netdev_chain, val, info);
1596 * call_netdevice_notifiers - call all network notifier blocks
1597 * @val: value passed unmodified to notifier function
1598 * @dev: net_device pointer passed unmodified to notifier function
1600 * Call all network notifier blocks. Parameters and return value
1601 * are as for raw_notifier_call_chain().
1604 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1606 struct netdev_notifier_info info;
1608 return call_netdevice_notifiers_info(val, dev, &info);
1610 EXPORT_SYMBOL(call_netdevice_notifiers);
1612 static struct static_key netstamp_needed __read_mostly;
1613 #ifdef HAVE_JUMP_LABEL
1614 /* We are not allowed to call static_key_slow_dec() from irq context
1615 * If net_disable_timestamp() is called from irq context, defer the
1616 * static_key_slow_dec() calls.
1618 static atomic_t netstamp_needed_deferred;
1621 void net_enable_timestamp(void)
1623 #ifdef HAVE_JUMP_LABEL
1624 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1628 static_key_slow_dec(&netstamp_needed);
1632 static_key_slow_inc(&netstamp_needed);
1634 EXPORT_SYMBOL(net_enable_timestamp);
1636 void net_disable_timestamp(void)
1638 #ifdef HAVE_JUMP_LABEL
1639 if (in_interrupt()) {
1640 atomic_inc(&netstamp_needed_deferred);
1644 static_key_slow_dec(&netstamp_needed);
1646 EXPORT_SYMBOL(net_disable_timestamp);
1648 static inline void net_timestamp_set(struct sk_buff *skb)
1650 skb->tstamp.tv64 = 0;
1651 if (static_key_false(&netstamp_needed))
1652 __net_timestamp(skb);
1655 #define net_timestamp_check(COND, SKB) \
1656 if (static_key_false(&netstamp_needed)) { \
1657 if ((COND) && !(SKB)->tstamp.tv64) \
1658 __net_timestamp(SKB); \
1661 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1665 if (!(dev->flags & IFF_UP))
1668 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1669 if (skb->len <= len)
1672 /* if TSO is enabled, we don't care about the length as the packet
1673 * could be forwarded without being segmented before
1675 if (skb_is_gso(skb))
1680 EXPORT_SYMBOL_GPL(is_skb_forwardable);
1682 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1684 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1685 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1686 atomic_long_inc(&dev->rx_dropped);
1692 if (unlikely(!is_skb_forwardable(dev, skb))) {
1693 atomic_long_inc(&dev->rx_dropped);
1698 skb_scrub_packet(skb, true);
1699 skb->protocol = eth_type_trans(skb, dev);
1703 EXPORT_SYMBOL_GPL(__dev_forward_skb);
1706 * dev_forward_skb - loopback an skb to another netif
1708 * @dev: destination network device
1709 * @skb: buffer to forward
1712 * NET_RX_SUCCESS (no congestion)
1713 * NET_RX_DROP (packet was dropped, but freed)
1715 * dev_forward_skb can be used for injecting an skb from the
1716 * start_xmit function of one device into the receive queue
1717 * of another device.
1719 * The receiving device may be in another namespace, so
1720 * we have to clear all information in the skb that could
1721 * impact namespace isolation.
1723 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1725 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
1727 EXPORT_SYMBOL_GPL(dev_forward_skb);
1729 static inline int deliver_skb(struct sk_buff *skb,
1730 struct packet_type *pt_prev,
1731 struct net_device *orig_dev)
1733 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1735 atomic_inc(&skb->users);
1736 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1739 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1741 if (!ptype->af_packet_priv || !skb->sk)
1744 if (ptype->id_match)
1745 return ptype->id_match(ptype, skb->sk);
1746 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1753 * Support routine. Sends outgoing frames to any network
1754 * taps currently in use.
1757 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1759 struct packet_type *ptype;
1760 struct sk_buff *skb2 = NULL;
1761 struct packet_type *pt_prev = NULL;
1764 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1765 /* Never send packets back to the socket
1766 * they originated from - MvS (miquels@drinkel.ow.org)
1768 if ((ptype->dev == dev || !ptype->dev) &&
1769 (!skb_loop_sk(ptype, skb))) {
1771 deliver_skb(skb2, pt_prev, skb->dev);
1776 skb2 = skb_clone(skb, GFP_ATOMIC);
1780 net_timestamp_set(skb2);
1782 /* skb->nh should be correctly
1783 set by sender, so that the second statement is
1784 just protection against buggy protocols.
1786 skb_reset_mac_header(skb2);
1788 if (skb_network_header(skb2) < skb2->data ||
1789 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
1790 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1791 ntohs(skb2->protocol),
1793 skb_reset_network_header(skb2);
1796 skb2->transport_header = skb2->network_header;
1797 skb2->pkt_type = PACKET_OUTGOING;
1802 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1807 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1808 * @dev: Network device
1809 * @txq: number of queues available
1811 * If real_num_tx_queues is changed the tc mappings may no longer be
1812 * valid. To resolve this verify the tc mapping remains valid and if
1813 * not NULL the mapping. With no priorities mapping to this
1814 * offset/count pair it will no longer be used. In the worst case TC0
1815 * is invalid nothing can be done so disable priority mappings. If is
1816 * expected that drivers will fix this mapping if they can before
1817 * calling netif_set_real_num_tx_queues.
1819 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1822 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1824 /* If TC0 is invalidated disable TC mapping */
1825 if (tc->offset + tc->count > txq) {
1826 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1831 /* Invalidated prio to tc mappings set to TC0 */
1832 for (i = 1; i < TC_BITMASK + 1; i++) {
1833 int q = netdev_get_prio_tc_map(dev, i);
1835 tc = &dev->tc_to_txq[q];
1836 if (tc->offset + tc->count > txq) {
1837 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1839 netdev_set_prio_tc_map(dev, i, 0);
1845 static DEFINE_MUTEX(xps_map_mutex);
1846 #define xmap_dereference(P) \
1847 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1849 static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
1852 struct xps_map *map = NULL;
1856 map = xmap_dereference(dev_maps->cpu_map[cpu]);
1858 for (pos = 0; map && pos < map->len; pos++) {
1859 if (map->queues[pos] == index) {
1861 map->queues[pos] = map->queues[--map->len];
1863 RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL);
1864 kfree_rcu(map, rcu);
1874 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
1876 struct xps_dev_maps *dev_maps;
1878 bool active = false;
1880 mutex_lock(&xps_map_mutex);
1881 dev_maps = xmap_dereference(dev->xps_maps);
1886 for_each_possible_cpu(cpu) {
1887 for (i = index; i < dev->num_tx_queues; i++) {
1888 if (!remove_xps_queue(dev_maps, cpu, i))
1891 if (i == dev->num_tx_queues)
1896 RCU_INIT_POINTER(dev->xps_maps, NULL);
1897 kfree_rcu(dev_maps, rcu);
1900 for (i = index; i < dev->num_tx_queues; i++)
1901 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
1905 mutex_unlock(&xps_map_mutex);
1908 static struct xps_map *expand_xps_map(struct xps_map *map,
1911 struct xps_map *new_map;
1912 int alloc_len = XPS_MIN_MAP_ALLOC;
1915 for (pos = 0; map && pos < map->len; pos++) {
1916 if (map->queues[pos] != index)
1921 /* Need to add queue to this CPU's existing map */
1923 if (pos < map->alloc_len)
1926 alloc_len = map->alloc_len * 2;
1929 /* Need to allocate new map to store queue on this CPU's map */
1930 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
1935 for (i = 0; i < pos; i++)
1936 new_map->queues[i] = map->queues[i];
1937 new_map->alloc_len = alloc_len;
1943 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
1946 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
1947 struct xps_map *map, *new_map;
1948 int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES);
1949 int cpu, numa_node_id = -2;
1950 bool active = false;
1952 mutex_lock(&xps_map_mutex);
1954 dev_maps = xmap_dereference(dev->xps_maps);
1956 /* allocate memory for queue storage */
1957 for_each_online_cpu(cpu) {
1958 if (!cpumask_test_cpu(cpu, mask))
1962 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
1963 if (!new_dev_maps) {
1964 mutex_unlock(&xps_map_mutex);
1968 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
1971 map = expand_xps_map(map, cpu, index);
1975 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
1979 goto out_no_new_maps;
1981 for_each_possible_cpu(cpu) {
1982 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
1983 /* add queue to CPU maps */
1986 map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
1987 while ((pos < map->len) && (map->queues[pos] != index))
1990 if (pos == map->len)
1991 map->queues[map->len++] = index;
1993 if (numa_node_id == -2)
1994 numa_node_id = cpu_to_node(cpu);
1995 else if (numa_node_id != cpu_to_node(cpu))
1998 } else if (dev_maps) {
1999 /* fill in the new device map from the old device map */
2000 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2001 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2006 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
2008 /* Cleanup old maps */
2010 for_each_possible_cpu(cpu) {
2011 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2012 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2013 if (map && map != new_map)
2014 kfree_rcu(map, rcu);
2017 kfree_rcu(dev_maps, rcu);
2020 dev_maps = new_dev_maps;
2024 /* update Tx queue numa node */
2025 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2026 (numa_node_id >= 0) ? numa_node_id :
2032 /* removes queue from unused CPUs */
2033 for_each_possible_cpu(cpu) {
2034 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu))
2037 if (remove_xps_queue(dev_maps, cpu, index))
2041 /* free map if not active */
2043 RCU_INIT_POINTER(dev->xps_maps, NULL);
2044 kfree_rcu(dev_maps, rcu);
2048 mutex_unlock(&xps_map_mutex);
2052 /* remove any maps that we added */
2053 for_each_possible_cpu(cpu) {
2054 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2055 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2057 if (new_map && new_map != map)
2061 mutex_unlock(&xps_map_mutex);
2063 kfree(new_dev_maps);
2066 EXPORT_SYMBOL(netif_set_xps_queue);
2070 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2071 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2073 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2077 if (txq < 1 || txq > dev->num_tx_queues)
2080 if (dev->reg_state == NETREG_REGISTERED ||
2081 dev->reg_state == NETREG_UNREGISTERING) {
2084 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2090 netif_setup_tc(dev, txq);
2092 if (txq < dev->real_num_tx_queues) {
2093 qdisc_reset_all_tx_gt(dev, txq);
2095 netif_reset_xps_queues_gt(dev, txq);
2100 dev->real_num_tx_queues = txq;
2103 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2107 * netif_set_real_num_rx_queues - set actual number of RX queues used
2108 * @dev: Network device
2109 * @rxq: Actual number of RX queues
2111 * This must be called either with the rtnl_lock held or before
2112 * registration of the net device. Returns 0 on success, or a
2113 * negative error code. If called before registration, it always
2116 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2120 if (rxq < 1 || rxq > dev->num_rx_queues)
2123 if (dev->reg_state == NETREG_REGISTERED) {
2126 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2132 dev->real_num_rx_queues = rxq;
2135 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2139 * netif_get_num_default_rss_queues - default number of RSS queues
2141 * This routine should set an upper limit on the number of RSS queues
2142 * used by default by multiqueue devices.
2144 int netif_get_num_default_rss_queues(void)
2146 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
2148 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
2150 static inline void __netif_reschedule(struct Qdisc *q)
2152 struct softnet_data *sd;
2153 unsigned long flags;
2155 local_irq_save(flags);
2156 sd = &__get_cpu_var(softnet_data);
2157 q->next_sched = NULL;
2158 *sd->output_queue_tailp = q;
2159 sd->output_queue_tailp = &q->next_sched;
2160 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2161 local_irq_restore(flags);
2164 void __netif_schedule(struct Qdisc *q)
2166 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
2167 __netif_reschedule(q);
2169 EXPORT_SYMBOL(__netif_schedule);
2171 struct dev_kfree_skb_cb {
2172 enum skb_free_reason reason;
2175 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
2177 return (struct dev_kfree_skb_cb *)skb->cb;
2180 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
2182 unsigned long flags;
2184 if (likely(atomic_read(&skb->users) == 1)) {
2186 atomic_set(&skb->users, 0);
2187 } else if (likely(!atomic_dec_and_test(&skb->users))) {
2190 get_kfree_skb_cb(skb)->reason = reason;
2191 local_irq_save(flags);
2192 skb->next = __this_cpu_read(softnet_data.completion_queue);
2193 __this_cpu_write(softnet_data.completion_queue, skb);
2194 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2195 local_irq_restore(flags);
2197 EXPORT_SYMBOL(__dev_kfree_skb_irq);
2199 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
2201 if (in_irq() || irqs_disabled())
2202 __dev_kfree_skb_irq(skb, reason);
2206 EXPORT_SYMBOL(__dev_kfree_skb_any);
2210 * netif_device_detach - mark device as removed
2211 * @dev: network device
2213 * Mark device as removed from system and therefore no longer available.
2215 void netif_device_detach(struct net_device *dev)
2217 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
2218 netif_running(dev)) {
2219 netif_tx_stop_all_queues(dev);
2222 EXPORT_SYMBOL(netif_device_detach);
2225 * netif_device_attach - mark device as attached
2226 * @dev: network device
2228 * Mark device as attached from system and restart if needed.
2230 void netif_device_attach(struct net_device *dev)
2232 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2233 netif_running(dev)) {
2234 netif_tx_wake_all_queues(dev);
2235 __netdev_watchdog_up(dev);
2238 EXPORT_SYMBOL(netif_device_attach);
2240 static void skb_warn_bad_offload(const struct sk_buff *skb)
2242 static const netdev_features_t null_features = 0;
2243 struct net_device *dev = skb->dev;
2244 const char *driver = "";
2246 if (!net_ratelimit())
2249 if (dev && dev->dev.parent)
2250 driver = dev_driver_string(dev->dev.parent);
2252 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2253 "gso_type=%d ip_summed=%d\n",
2254 driver, dev ? &dev->features : &null_features,
2255 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2256 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2257 skb_shinfo(skb)->gso_type, skb->ip_summed);
2261 * Invalidate hardware checksum when packet is to be mangled, and
2262 * complete checksum manually on outgoing path.
2264 int skb_checksum_help(struct sk_buff *skb)
2267 int ret = 0, offset;
2269 if (skb->ip_summed == CHECKSUM_COMPLETE)
2270 goto out_set_summed;
2272 if (unlikely(skb_shinfo(skb)->gso_size)) {
2273 skb_warn_bad_offload(skb);
2277 /* Before computing a checksum, we should make sure no frag could
2278 * be modified by an external entity : checksum could be wrong.
2280 if (skb_has_shared_frag(skb)) {
2281 ret = __skb_linearize(skb);
2286 offset = skb_checksum_start_offset(skb);
2287 BUG_ON(offset >= skb_headlen(skb));
2288 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2290 offset += skb->csum_offset;
2291 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2293 if (skb_cloned(skb) &&
2294 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2295 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2300 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
2302 skb->ip_summed = CHECKSUM_NONE;
2306 EXPORT_SYMBOL(skb_checksum_help);
2308 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
2310 unsigned int vlan_depth = skb->mac_len;
2311 __be16 type = skb->protocol;
2313 /* Tunnel gso handlers can set protocol to ethernet. */
2314 if (type == htons(ETH_P_TEB)) {
2317 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
2320 eth = (struct ethhdr *)skb_mac_header(skb);
2321 type = eth->h_proto;
2324 /* if skb->protocol is 802.1Q/AD then the header should already be
2325 * present at mac_len - VLAN_HLEN (if mac_len > 0), or at
2326 * ETH_HLEN otherwise
2328 if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) {
2330 if (WARN_ON(vlan_depth < VLAN_HLEN))
2332 vlan_depth -= VLAN_HLEN;
2334 vlan_depth = ETH_HLEN;
2337 struct vlan_hdr *vh;
2339 if (unlikely(!pskb_may_pull(skb,
2340 vlan_depth + VLAN_HLEN)))
2343 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
2344 type = vh->h_vlan_encapsulated_proto;
2345 vlan_depth += VLAN_HLEN;
2346 } while (type == htons(ETH_P_8021Q) ||
2347 type == htons(ETH_P_8021AD));
2350 *depth = vlan_depth;
2356 * skb_mac_gso_segment - mac layer segmentation handler.
2357 * @skb: buffer to segment
2358 * @features: features for the output path (see dev->features)
2360 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
2361 netdev_features_t features)
2363 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
2364 struct packet_offload *ptype;
2365 int vlan_depth = skb->mac_len;
2366 __be16 type = skb_network_protocol(skb, &vlan_depth);
2368 if (unlikely(!type))
2369 return ERR_PTR(-EINVAL);
2371 __skb_pull(skb, vlan_depth);
2374 list_for_each_entry_rcu(ptype, &offload_base, list) {
2375 if (ptype->type == type && ptype->callbacks.gso_segment) {
2376 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
2379 err = ptype->callbacks.gso_send_check(skb);
2380 segs = ERR_PTR(err);
2381 if (err || skb_gso_ok(skb, features))
2383 __skb_push(skb, (skb->data -
2384 skb_network_header(skb)));
2386 segs = ptype->callbacks.gso_segment(skb, features);
2392 __skb_push(skb, skb->data - skb_mac_header(skb));
2396 EXPORT_SYMBOL(skb_mac_gso_segment);
2399 /* openvswitch calls this on rx path, so we need a different check.
2401 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
2404 return skb->ip_summed != CHECKSUM_PARTIAL;
2406 return skb->ip_summed == CHECKSUM_NONE;
2410 * __skb_gso_segment - Perform segmentation on skb.
2411 * @skb: buffer to segment
2412 * @features: features for the output path (see dev->features)
2413 * @tx_path: whether it is called in TX path
2415 * This function segments the given skb and returns a list of segments.
2417 * It may return NULL if the skb requires no segmentation. This is
2418 * only possible when GSO is used for verifying header integrity.
2420 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
2421 netdev_features_t features, bool tx_path)
2423 if (unlikely(skb_needs_check(skb, tx_path))) {
2426 skb_warn_bad_offload(skb);
2428 err = skb_cow_head(skb, 0);
2430 return ERR_PTR(err);
2433 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
2434 SKB_GSO_CB(skb)->encap_level = 0;
2436 skb_reset_mac_header(skb);
2437 skb_reset_mac_len(skb);
2439 return skb_mac_gso_segment(skb, features);
2441 EXPORT_SYMBOL(__skb_gso_segment);
2443 /* Take action when hardware reception checksum errors are detected. */
2445 void netdev_rx_csum_fault(struct net_device *dev)
2447 if (net_ratelimit()) {
2448 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2452 EXPORT_SYMBOL(netdev_rx_csum_fault);
2455 /* Actually, we should eliminate this check as soon as we know, that:
2456 * 1. IOMMU is present and allows to map all the memory.
2457 * 2. No high memory really exists on this machine.
2460 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2462 #ifdef CONFIG_HIGHMEM
2464 if (!(dev->features & NETIF_F_HIGHDMA)) {
2465 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2466 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2467 if (PageHighMem(skb_frag_page(frag)))
2472 if (PCI_DMA_BUS_IS_PHYS) {
2473 struct device *pdev = dev->dev.parent;
2477 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2478 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2479 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2480 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2489 void (*destructor)(struct sk_buff *skb);
2492 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2494 static void dev_gso_skb_destructor(struct sk_buff *skb)
2496 struct dev_gso_cb *cb;
2498 kfree_skb_list(skb->next);
2501 cb = DEV_GSO_CB(skb);
2503 cb->destructor(skb);
2507 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2508 * @skb: buffer to segment
2509 * @features: device features as applicable to this skb
2511 * This function segments the given skb and stores the list of segments
2514 static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2516 struct sk_buff *segs;
2518 segs = skb_gso_segment(skb, features);
2520 /* Verifying header integrity only. */
2525 return PTR_ERR(segs);
2528 DEV_GSO_CB(skb)->destructor = skb->destructor;
2529 skb->destructor = dev_gso_skb_destructor;
2534 /* If MPLS offload request, verify we are testing hardware MPLS features
2535 * instead of standard features for the netdev.
2537 #ifdef CONFIG_NET_MPLS_GSO
2538 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2539 netdev_features_t features,
2542 if (type == htons(ETH_P_MPLS_UC) || type == htons(ETH_P_MPLS_MC))
2543 features &= skb->dev->mpls_features;
2548 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2549 netdev_features_t features,
2556 static netdev_features_t harmonize_features(struct sk_buff *skb,
2557 netdev_features_t features)
2562 type = skb_network_protocol(skb, &tmp);
2563 features = net_mpls_features(skb, features, type);
2565 if (skb->ip_summed != CHECKSUM_NONE &&
2566 !can_checksum_protocol(features, type)) {
2567 features &= ~NETIF_F_ALL_CSUM;
2568 } else if (illegal_highdma(skb->dev, skb)) {
2569 features &= ~NETIF_F_SG;
2575 netdev_features_t netif_skb_features(struct sk_buff *skb)
2577 __be16 protocol = skb->protocol;
2578 netdev_features_t features = skb->dev->features;
2580 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2581 features &= ~NETIF_F_GSO_MASK;
2583 if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) {
2584 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2585 protocol = veh->h_vlan_encapsulated_proto;
2586 } else if (!vlan_tx_tag_present(skb)) {
2587 return harmonize_features(skb, features);
2590 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX |
2591 NETIF_F_HW_VLAN_STAG_TX);
2593 if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD))
2594 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2595 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
2596 NETIF_F_HW_VLAN_STAG_TX;
2598 return harmonize_features(skb, features);
2600 EXPORT_SYMBOL(netif_skb_features);
2602 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
2603 struct netdev_queue *txq, bool more)
2608 if (!list_empty(&ptype_all))
2609 dev_queue_xmit_nit(skb, dev);
2612 trace_net_dev_start_xmit(skb, dev);
2613 rc = netdev_start_xmit(skb, dev, txq, more);
2614 trace_net_dev_xmit(skb, rc, dev, len);
2619 static struct sk_buff *xmit_list(struct sk_buff *first, struct net_device *dev,
2620 struct netdev_queue *txq, int *ret)
2622 struct sk_buff *skb = first;
2623 int rc = NETDEV_TX_OK;
2626 struct sk_buff *next = skb->next;
2629 rc = xmit_one(skb, dev, txq, next != NULL);
2630 if (unlikely(!dev_xmit_complete(rc))) {
2636 if (netif_xmit_stopped(txq) && skb) {
2637 rc = NETDEV_TX_BUSY;
2647 struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, netdev_features_t features)
2649 if (vlan_tx_tag_present(skb) &&
2650 !vlan_hw_offload_capable(features, skb->vlan_proto)) {
2651 skb = __vlan_put_tag(skb, skb->vlan_proto,
2652 vlan_tx_tag_get(skb));
2659 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
2661 netdev_features_t features;
2666 /* If device doesn't need skb->dst, release it right now while
2667 * its hot in this cpu cache
2669 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2672 features = netif_skb_features(skb);
2673 skb = validate_xmit_vlan(skb, features);
2677 /* If encapsulation offload request, verify we are testing
2678 * hardware encapsulation features instead of standard
2679 * features for the netdev
2681 if (skb->encapsulation)
2682 features &= dev->hw_enc_features;
2684 if (netif_needs_gso(skb, features)) {
2685 if (unlikely(dev_gso_segment(skb, features)))
2688 if (skb_needs_linearize(skb, features) &&
2689 __skb_linearize(skb))
2692 /* If packet is not checksummed and device does not
2693 * support checksumming for this protocol, complete
2694 * checksumming here.
2696 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2697 if (skb->encapsulation)
2698 skb_set_inner_transport_header(skb,
2699 skb_checksum_start_offset(skb));
2701 skb_set_transport_header(skb,
2702 skb_checksum_start_offset(skb));
2703 if (!(features & NETIF_F_ALL_CSUM) &&
2704 skb_checksum_help(skb))
2717 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2718 struct netdev_queue *txq)
2720 int rc = NETDEV_TX_OK;
2722 skb = validate_xmit_skb(skb, dev);
2726 if (likely(!skb->next))
2727 return xmit_one(skb, dev, txq, false);
2729 skb->next = xmit_list(skb->next, dev, txq, &rc);
2730 if (likely(skb->next == NULL)) {
2731 skb->destructor = DEV_GSO_CB(skb)->destructor;
2740 EXPORT_SYMBOL_GPL(dev_hard_start_xmit);
2742 static void qdisc_pkt_len_init(struct sk_buff *skb)
2744 const struct skb_shared_info *shinfo = skb_shinfo(skb);
2746 qdisc_skb_cb(skb)->pkt_len = skb->len;
2748 /* To get more precise estimation of bytes sent on wire,
2749 * we add to pkt_len the headers size of all segments
2751 if (shinfo->gso_size) {
2752 unsigned int hdr_len;
2753 u16 gso_segs = shinfo->gso_segs;
2755 /* mac layer + network layer */
2756 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
2758 /* + transport layer */
2759 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
2760 hdr_len += tcp_hdrlen(skb);
2762 hdr_len += sizeof(struct udphdr);
2764 if (shinfo->gso_type & SKB_GSO_DODGY)
2765 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
2768 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
2772 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2773 struct net_device *dev,
2774 struct netdev_queue *txq)
2776 spinlock_t *root_lock = qdisc_lock(q);
2780 qdisc_pkt_len_init(skb);
2781 qdisc_calculate_pkt_len(skb, q);
2783 * Heuristic to force contended enqueues to serialize on a
2784 * separate lock before trying to get qdisc main lock.
2785 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2786 * often and dequeue packets faster.
2788 contended = qdisc_is_running(q);
2789 if (unlikely(contended))
2790 spin_lock(&q->busylock);
2792 spin_lock(root_lock);
2793 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2796 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2797 qdisc_run_begin(q)) {
2799 * This is a work-conserving queue; there are no old skbs
2800 * waiting to be sent out; and the qdisc is not running -
2801 * xmit the skb directly.
2803 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2806 qdisc_bstats_update(q, skb);
2808 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2809 if (unlikely(contended)) {
2810 spin_unlock(&q->busylock);
2817 rc = NET_XMIT_SUCCESS;
2820 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2821 if (qdisc_run_begin(q)) {
2822 if (unlikely(contended)) {
2823 spin_unlock(&q->busylock);
2829 spin_unlock(root_lock);
2830 if (unlikely(contended))
2831 spin_unlock(&q->busylock);
2835 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2836 static void skb_update_prio(struct sk_buff *skb)
2838 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2840 if (!skb->priority && skb->sk && map) {
2841 unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
2843 if (prioidx < map->priomap_len)
2844 skb->priority = map->priomap[prioidx];
2848 #define skb_update_prio(skb)
2851 static DEFINE_PER_CPU(int, xmit_recursion);
2852 #define RECURSION_LIMIT 10
2855 * dev_loopback_xmit - loop back @skb
2856 * @skb: buffer to transmit
2858 int dev_loopback_xmit(struct sk_buff *skb)
2860 skb_reset_mac_header(skb);
2861 __skb_pull(skb, skb_network_offset(skb));
2862 skb->pkt_type = PACKET_LOOPBACK;
2863 skb->ip_summed = CHECKSUM_UNNECESSARY;
2864 WARN_ON(!skb_dst(skb));
2869 EXPORT_SYMBOL(dev_loopback_xmit);
2872 * __dev_queue_xmit - transmit a buffer
2873 * @skb: buffer to transmit
2874 * @accel_priv: private data used for L2 forwarding offload
2876 * Queue a buffer for transmission to a network device. The caller must
2877 * have set the device and priority and built the buffer before calling
2878 * this function. The function can be called from an interrupt.
2880 * A negative errno code is returned on a failure. A success does not
2881 * guarantee the frame will be transmitted as it may be dropped due
2882 * to congestion or traffic shaping.
2884 * -----------------------------------------------------------------------------------
2885 * I notice this method can also return errors from the queue disciplines,
2886 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2889 * Regardless of the return value, the skb is consumed, so it is currently
2890 * difficult to retry a send to this method. (You can bump the ref count
2891 * before sending to hold a reference for retry if you are careful.)
2893 * When calling this method, interrupts MUST be enabled. This is because
2894 * the BH enable code must have IRQs enabled so that it will not deadlock.
2897 static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
2899 struct net_device *dev = skb->dev;
2900 struct netdev_queue *txq;
2904 skb_reset_mac_header(skb);
2906 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
2907 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
2909 /* Disable soft irqs for various locks below. Also
2910 * stops preemption for RCU.
2914 skb_update_prio(skb);
2916 txq = netdev_pick_tx(dev, skb, accel_priv);
2917 q = rcu_dereference_bh(txq->qdisc);
2919 #ifdef CONFIG_NET_CLS_ACT
2920 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2922 trace_net_dev_queue(skb);
2924 rc = __dev_xmit_skb(skb, q, dev, txq);
2928 /* The device has no queue. Common case for software devices:
2929 loopback, all the sorts of tunnels...
2931 Really, it is unlikely that netif_tx_lock protection is necessary
2932 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2934 However, it is possible, that they rely on protection
2937 Check this and shot the lock. It is not prone from deadlocks.
2938 Either shot noqueue qdisc, it is even simpler 8)
2940 if (dev->flags & IFF_UP) {
2941 int cpu = smp_processor_id(); /* ok because BHs are off */
2943 if (txq->xmit_lock_owner != cpu) {
2945 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2946 goto recursion_alert;
2948 HARD_TX_LOCK(dev, txq, cpu);
2950 if (!netif_xmit_stopped(txq)) {
2951 __this_cpu_inc(xmit_recursion);
2952 rc = dev_hard_start_xmit(skb, dev, txq);
2953 __this_cpu_dec(xmit_recursion);
2954 if (dev_xmit_complete(rc)) {
2955 HARD_TX_UNLOCK(dev, txq);
2959 HARD_TX_UNLOCK(dev, txq);
2960 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2963 /* Recursion is detected! It is possible,
2967 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2973 rcu_read_unlock_bh();
2975 atomic_long_inc(&dev->tx_dropped);
2979 rcu_read_unlock_bh();
2983 int dev_queue_xmit(struct sk_buff *skb)
2985 return __dev_queue_xmit(skb, NULL);
2987 EXPORT_SYMBOL(dev_queue_xmit);
2989 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
2991 return __dev_queue_xmit(skb, accel_priv);
2993 EXPORT_SYMBOL(dev_queue_xmit_accel);
2996 /*=======================================================================
2998 =======================================================================*/
3000 int netdev_max_backlog __read_mostly = 1000;
3001 EXPORT_SYMBOL(netdev_max_backlog);
3003 int netdev_tstamp_prequeue __read_mostly = 1;
3004 int netdev_budget __read_mostly = 300;
3005 int weight_p __read_mostly = 64; /* old backlog weight */
3007 /* Called with irq disabled */
3008 static inline void ____napi_schedule(struct softnet_data *sd,
3009 struct napi_struct *napi)
3011 list_add_tail(&napi->poll_list, &sd->poll_list);
3012 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3017 /* One global table that all flow-based protocols share. */
3018 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
3019 EXPORT_SYMBOL(rps_sock_flow_table);
3021 struct static_key rps_needed __read_mostly;
3023 static struct rps_dev_flow *
3024 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3025 struct rps_dev_flow *rflow, u16 next_cpu)
3027 if (next_cpu != RPS_NO_CPU) {
3028 #ifdef CONFIG_RFS_ACCEL
3029 struct netdev_rx_queue *rxqueue;
3030 struct rps_dev_flow_table *flow_table;
3031 struct rps_dev_flow *old_rflow;
3036 /* Should we steer this flow to a different hardware queue? */
3037 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
3038 !(dev->features & NETIF_F_NTUPLE))
3040 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
3041 if (rxq_index == skb_get_rx_queue(skb))
3044 rxqueue = dev->_rx + rxq_index;
3045 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3048 flow_id = skb_get_hash(skb) & flow_table->mask;
3049 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
3050 rxq_index, flow_id);
3054 rflow = &flow_table->flows[flow_id];
3056 if (old_rflow->filter == rflow->filter)
3057 old_rflow->filter = RPS_NO_FILTER;
3061 per_cpu(softnet_data, next_cpu).input_queue_head;
3064 rflow->cpu = next_cpu;
3069 * get_rps_cpu is called from netif_receive_skb and returns the target
3070 * CPU from the RPS map of the receiving queue for a given skb.
3071 * rcu_read_lock must be held on entry.
3073 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3074 struct rps_dev_flow **rflowp)
3076 struct netdev_rx_queue *rxqueue;
3077 struct rps_map *map;
3078 struct rps_dev_flow_table *flow_table;
3079 struct rps_sock_flow_table *sock_flow_table;
3084 if (skb_rx_queue_recorded(skb)) {
3085 u16 index = skb_get_rx_queue(skb);
3086 if (unlikely(index >= dev->real_num_rx_queues)) {
3087 WARN_ONCE(dev->real_num_rx_queues > 1,
3088 "%s received packet on queue %u, but number "
3089 "of RX queues is %u\n",
3090 dev->name, index, dev->real_num_rx_queues);
3093 rxqueue = dev->_rx + index;
3097 map = rcu_dereference(rxqueue->rps_map);
3099 if (map->len == 1 &&
3100 !rcu_access_pointer(rxqueue->rps_flow_table)) {
3101 tcpu = map->cpus[0];
3102 if (cpu_online(tcpu))
3106 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
3110 skb_reset_network_header(skb);
3111 hash = skb_get_hash(skb);
3115 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3116 sock_flow_table = rcu_dereference(rps_sock_flow_table);
3117 if (flow_table && sock_flow_table) {
3119 struct rps_dev_flow *rflow;
3121 rflow = &flow_table->flows[hash & flow_table->mask];
3124 next_cpu = sock_flow_table->ents[hash & sock_flow_table->mask];
3127 * If the desired CPU (where last recvmsg was done) is
3128 * different from current CPU (one in the rx-queue flow
3129 * table entry), switch if one of the following holds:
3130 * - Current CPU is unset (equal to RPS_NO_CPU).
3131 * - Current CPU is offline.
3132 * - The current CPU's queue tail has advanced beyond the
3133 * last packet that was enqueued using this table entry.
3134 * This guarantees that all previous packets for the flow
3135 * have been dequeued, thus preserving in order delivery.
3137 if (unlikely(tcpu != next_cpu) &&
3138 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
3139 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
3140 rflow->last_qtail)) >= 0)) {
3142 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
3145 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
3153 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
3154 if (cpu_online(tcpu)) {
3164 #ifdef CONFIG_RFS_ACCEL
3167 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3168 * @dev: Device on which the filter was set
3169 * @rxq_index: RX queue index
3170 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3171 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3173 * Drivers that implement ndo_rx_flow_steer() should periodically call
3174 * this function for each installed filter and remove the filters for
3175 * which it returns %true.
3177 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
3178 u32 flow_id, u16 filter_id)
3180 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
3181 struct rps_dev_flow_table *flow_table;
3182 struct rps_dev_flow *rflow;
3187 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3188 if (flow_table && flow_id <= flow_table->mask) {
3189 rflow = &flow_table->flows[flow_id];
3190 cpu = ACCESS_ONCE(rflow->cpu);
3191 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
3192 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
3193 rflow->last_qtail) <
3194 (int)(10 * flow_table->mask)))
3200 EXPORT_SYMBOL(rps_may_expire_flow);
3202 #endif /* CONFIG_RFS_ACCEL */
3204 /* Called from hardirq (IPI) context */
3205 static void rps_trigger_softirq(void *data)
3207 struct softnet_data *sd = data;
3209 ____napi_schedule(sd, &sd->backlog);
3213 #endif /* CONFIG_RPS */
3216 * Check if this softnet_data structure is another cpu one
3217 * If yes, queue it to our IPI list and return 1
3220 static int rps_ipi_queued(struct softnet_data *sd)
3223 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
3226 sd->rps_ipi_next = mysd->rps_ipi_list;
3227 mysd->rps_ipi_list = sd;
3229 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3232 #endif /* CONFIG_RPS */
3236 #ifdef CONFIG_NET_FLOW_LIMIT
3237 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
3240 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
3242 #ifdef CONFIG_NET_FLOW_LIMIT
3243 struct sd_flow_limit *fl;
3244 struct softnet_data *sd;
3245 unsigned int old_flow, new_flow;
3247 if (qlen < (netdev_max_backlog >> 1))
3250 sd = &__get_cpu_var(softnet_data);
3253 fl = rcu_dereference(sd->flow_limit);
3255 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
3256 old_flow = fl->history[fl->history_head];
3257 fl->history[fl->history_head] = new_flow;
3260 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
3262 if (likely(fl->buckets[old_flow]))
3263 fl->buckets[old_flow]--;
3265 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
3277 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3278 * queue (may be a remote CPU queue).
3280 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
3281 unsigned int *qtail)
3283 struct softnet_data *sd;
3284 unsigned long flags;
3287 sd = &per_cpu(softnet_data, cpu);
3289 local_irq_save(flags);
3292 qlen = skb_queue_len(&sd->input_pkt_queue);
3293 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
3294 if (skb_queue_len(&sd->input_pkt_queue)) {
3296 __skb_queue_tail(&sd->input_pkt_queue, skb);
3297 input_queue_tail_incr_save(sd, qtail);
3299 local_irq_restore(flags);
3300 return NET_RX_SUCCESS;
3303 /* Schedule NAPI for backlog device
3304 * We can use non atomic operation since we own the queue lock
3306 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
3307 if (!rps_ipi_queued(sd))
3308 ____napi_schedule(sd, &sd->backlog);
3316 local_irq_restore(flags);
3318 atomic_long_inc(&skb->dev->rx_dropped);
3323 static int netif_rx_internal(struct sk_buff *skb)
3327 net_timestamp_check(netdev_tstamp_prequeue, skb);
3329 trace_netif_rx(skb);
3331 if (static_key_false(&rps_needed)) {
3332 struct rps_dev_flow voidflow, *rflow = &voidflow;
3338 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3340 cpu = smp_processor_id();
3342 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3350 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3357 * netif_rx - post buffer to the network code
3358 * @skb: buffer to post
3360 * This function receives a packet from a device driver and queues it for
3361 * the upper (protocol) levels to process. It always succeeds. The buffer
3362 * may be dropped during processing for congestion control or by the
3366 * NET_RX_SUCCESS (no congestion)
3367 * NET_RX_DROP (packet was dropped)
3371 int netif_rx(struct sk_buff *skb)
3373 trace_netif_rx_entry(skb);
3375 return netif_rx_internal(skb);
3377 EXPORT_SYMBOL(netif_rx);
3379 int netif_rx_ni(struct sk_buff *skb)
3383 trace_netif_rx_ni_entry(skb);
3386 err = netif_rx_internal(skb);
3387 if (local_softirq_pending())
3393 EXPORT_SYMBOL(netif_rx_ni);
3395 static void net_tx_action(struct softirq_action *h)
3397 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3399 if (sd->completion_queue) {
3400 struct sk_buff *clist;
3402 local_irq_disable();
3403 clist = sd->completion_queue;
3404 sd->completion_queue = NULL;
3408 struct sk_buff *skb = clist;
3409 clist = clist->next;
3411 WARN_ON(atomic_read(&skb->users));
3412 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
3413 trace_consume_skb(skb);
3415 trace_kfree_skb(skb, net_tx_action);
3420 if (sd->output_queue) {
3423 local_irq_disable();
3424 head = sd->output_queue;
3425 sd->output_queue = NULL;
3426 sd->output_queue_tailp = &sd->output_queue;
3430 struct Qdisc *q = head;
3431 spinlock_t *root_lock;
3433 head = head->next_sched;
3435 root_lock = qdisc_lock(q);
3436 if (spin_trylock(root_lock)) {
3437 smp_mb__before_atomic();
3438 clear_bit(__QDISC_STATE_SCHED,
3441 spin_unlock(root_lock);
3443 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3445 __netif_reschedule(q);
3447 smp_mb__before_atomic();
3448 clear_bit(__QDISC_STATE_SCHED,
3456 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3457 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3458 /* This hook is defined here for ATM LANE */
3459 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3460 unsigned char *addr) __read_mostly;
3461 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3464 #ifdef CONFIG_NET_CLS_ACT
3465 /* TODO: Maybe we should just force sch_ingress to be compiled in
3466 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3467 * a compare and 2 stores extra right now if we dont have it on
3468 * but have CONFIG_NET_CLS_ACT
3469 * NOTE: This doesn't stop any functionality; if you dont have
3470 * the ingress scheduler, you just can't add policies on ingress.
3473 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3475 struct net_device *dev = skb->dev;
3476 u32 ttl = G_TC_RTTL(skb->tc_verd);
3477 int result = TC_ACT_OK;
3480 if (unlikely(MAX_RED_LOOP < ttl++)) {
3481 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3482 skb->skb_iif, dev->ifindex);
3486 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3487 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3490 if (q != &noop_qdisc) {
3491 spin_lock(qdisc_lock(q));
3492 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3493 result = qdisc_enqueue_root(skb, q);
3494 spin_unlock(qdisc_lock(q));
3500 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3501 struct packet_type **pt_prev,
3502 int *ret, struct net_device *orig_dev)
3504 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3506 if (!rxq || rxq->qdisc == &noop_qdisc)
3510 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3514 switch (ing_filter(skb, rxq)) {
3528 * netdev_rx_handler_register - register receive handler
3529 * @dev: device to register a handler for
3530 * @rx_handler: receive handler to register
3531 * @rx_handler_data: data pointer that is used by rx handler
3533 * Register a receive handler for a device. This handler will then be
3534 * called from __netif_receive_skb. A negative errno code is returned
3537 * The caller must hold the rtnl_mutex.
3539 * For a general description of rx_handler, see enum rx_handler_result.
3541 int netdev_rx_handler_register(struct net_device *dev,
3542 rx_handler_func_t *rx_handler,
3543 void *rx_handler_data)
3547 if (dev->rx_handler)
3550 /* Note: rx_handler_data must be set before rx_handler */
3551 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3552 rcu_assign_pointer(dev->rx_handler, rx_handler);
3556 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3559 * netdev_rx_handler_unregister - unregister receive handler
3560 * @dev: device to unregister a handler from
3562 * Unregister a receive handler from a device.
3564 * The caller must hold the rtnl_mutex.
3566 void netdev_rx_handler_unregister(struct net_device *dev)
3570 RCU_INIT_POINTER(dev->rx_handler, NULL);
3571 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3572 * section has a guarantee to see a non NULL rx_handler_data
3576 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3578 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3581 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3582 * the special handling of PFMEMALLOC skbs.
3584 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
3586 switch (skb->protocol) {
3587 case htons(ETH_P_ARP):
3588 case htons(ETH_P_IP):
3589 case htons(ETH_P_IPV6):
3590 case htons(ETH_P_8021Q):
3591 case htons(ETH_P_8021AD):
3598 static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
3600 struct packet_type *ptype, *pt_prev;
3601 rx_handler_func_t *rx_handler;
3602 struct net_device *orig_dev;
3603 struct net_device *null_or_dev;
3604 bool deliver_exact = false;
3605 int ret = NET_RX_DROP;
3608 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3610 trace_netif_receive_skb(skb);
3612 orig_dev = skb->dev;
3614 skb_reset_network_header(skb);
3615 if (!skb_transport_header_was_set(skb))
3616 skb_reset_transport_header(skb);
3617 skb_reset_mac_len(skb);
3624 skb->skb_iif = skb->dev->ifindex;
3626 __this_cpu_inc(softnet_data.processed);
3628 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
3629 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
3630 skb = skb_vlan_untag(skb);
3635 #ifdef CONFIG_NET_CLS_ACT
3636 if (skb->tc_verd & TC_NCLS) {
3637 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3645 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3646 if (!ptype->dev || ptype->dev == skb->dev) {
3648 ret = deliver_skb(skb, pt_prev, orig_dev);
3654 #ifdef CONFIG_NET_CLS_ACT
3655 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3661 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
3664 if (vlan_tx_tag_present(skb)) {
3666 ret = deliver_skb(skb, pt_prev, orig_dev);
3669 if (vlan_do_receive(&skb))
3671 else if (unlikely(!skb))
3675 rx_handler = rcu_dereference(skb->dev->rx_handler);
3678 ret = deliver_skb(skb, pt_prev, orig_dev);
3681 switch (rx_handler(&skb)) {
3682 case RX_HANDLER_CONSUMED:
3683 ret = NET_RX_SUCCESS;
3685 case RX_HANDLER_ANOTHER:
3687 case RX_HANDLER_EXACT:
3688 deliver_exact = true;
3689 case RX_HANDLER_PASS:
3696 if (unlikely(vlan_tx_tag_present(skb))) {
3697 if (vlan_tx_tag_get_id(skb))
3698 skb->pkt_type = PACKET_OTHERHOST;
3699 /* Note: we might in the future use prio bits
3700 * and set skb->priority like in vlan_do_receive()
3701 * For the time being, just ignore Priority Code Point
3706 /* deliver only exact match when indicated */
3707 null_or_dev = deliver_exact ? skb->dev : NULL;
3709 type = skb->protocol;
3710 list_for_each_entry_rcu(ptype,
3711 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3712 if (ptype->type == type &&
3713 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3714 ptype->dev == orig_dev)) {
3716 ret = deliver_skb(skb, pt_prev, orig_dev);
3722 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
3725 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3728 atomic_long_inc(&skb->dev->rx_dropped);
3730 /* Jamal, now you will not able to escape explaining
3731 * me how you were going to use this. :-)
3741 static int __netif_receive_skb(struct sk_buff *skb)
3745 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
3746 unsigned long pflags = current->flags;
3749 * PFMEMALLOC skbs are special, they should
3750 * - be delivered to SOCK_MEMALLOC sockets only
3751 * - stay away from userspace
3752 * - have bounded memory usage
3754 * Use PF_MEMALLOC as this saves us from propagating the allocation
3755 * context down to all allocation sites.
3757 current->flags |= PF_MEMALLOC;
3758 ret = __netif_receive_skb_core(skb, true);
3759 tsk_restore_flags(current, pflags, PF_MEMALLOC);
3761 ret = __netif_receive_skb_core(skb, false);
3766 static int netif_receive_skb_internal(struct sk_buff *skb)
3768 net_timestamp_check(netdev_tstamp_prequeue, skb);
3770 if (skb_defer_rx_timestamp(skb))
3771 return NET_RX_SUCCESS;
3774 if (static_key_false(&rps_needed)) {
3775 struct rps_dev_flow voidflow, *rflow = &voidflow;
3780 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3783 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3790 return __netif_receive_skb(skb);
3794 * netif_receive_skb - process receive buffer from network
3795 * @skb: buffer to process
3797 * netif_receive_skb() is the main receive data processing function.
3798 * It always succeeds. The buffer may be dropped during processing
3799 * for congestion control or by the protocol layers.
3801 * This function may only be called from softirq context and interrupts
3802 * should be enabled.
3804 * Return values (usually ignored):
3805 * NET_RX_SUCCESS: no congestion
3806 * NET_RX_DROP: packet was dropped
3808 int netif_receive_skb(struct sk_buff *skb)
3810 trace_netif_receive_skb_entry(skb);
3812 return netif_receive_skb_internal(skb);
3814 EXPORT_SYMBOL(netif_receive_skb);
3816 /* Network device is going away, flush any packets still pending
3817 * Called with irqs disabled.
3819 static void flush_backlog(void *arg)
3821 struct net_device *dev = arg;
3822 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3823 struct sk_buff *skb, *tmp;
3826 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3827 if (skb->dev == dev) {
3828 __skb_unlink(skb, &sd->input_pkt_queue);
3830 input_queue_head_incr(sd);
3835 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3836 if (skb->dev == dev) {
3837 __skb_unlink(skb, &sd->process_queue);
3839 input_queue_head_incr(sd);
3844 static int napi_gro_complete(struct sk_buff *skb)
3846 struct packet_offload *ptype;
3847 __be16 type = skb->protocol;
3848 struct list_head *head = &offload_base;
3851 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
3853 if (NAPI_GRO_CB(skb)->count == 1) {
3854 skb_shinfo(skb)->gso_size = 0;
3859 list_for_each_entry_rcu(ptype, head, list) {
3860 if (ptype->type != type || !ptype->callbacks.gro_complete)
3863 err = ptype->callbacks.gro_complete(skb, 0);
3869 WARN_ON(&ptype->list == head);
3871 return NET_RX_SUCCESS;
3875 return netif_receive_skb_internal(skb);
3878 /* napi->gro_list contains packets ordered by age.
3879 * youngest packets at the head of it.
3880 * Complete skbs in reverse order to reduce latencies.
3882 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
3884 struct sk_buff *skb, *prev = NULL;
3886 /* scan list and build reverse chain */
3887 for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
3892 for (skb = prev; skb; skb = prev) {
3895 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
3899 napi_gro_complete(skb);
3903 napi->gro_list = NULL;
3905 EXPORT_SYMBOL(napi_gro_flush);
3907 static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
3910 unsigned int maclen = skb->dev->hard_header_len;
3911 u32 hash = skb_get_hash_raw(skb);
3913 for (p = napi->gro_list; p; p = p->next) {
3914 unsigned long diffs;
3916 NAPI_GRO_CB(p)->flush = 0;
3918 if (hash != skb_get_hash_raw(p)) {
3919 NAPI_GRO_CB(p)->same_flow = 0;
3923 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3924 diffs |= p->vlan_tci ^ skb->vlan_tci;
3925 if (maclen == ETH_HLEN)
3926 diffs |= compare_ether_header(skb_mac_header(p),
3927 skb_mac_header(skb));
3929 diffs = memcmp(skb_mac_header(p),
3930 skb_mac_header(skb),
3932 NAPI_GRO_CB(p)->same_flow = !diffs;
3936 static void skb_gro_reset_offset(struct sk_buff *skb)
3938 const struct skb_shared_info *pinfo = skb_shinfo(skb);
3939 const skb_frag_t *frag0 = &pinfo->frags[0];
3941 NAPI_GRO_CB(skb)->data_offset = 0;
3942 NAPI_GRO_CB(skb)->frag0 = NULL;
3943 NAPI_GRO_CB(skb)->frag0_len = 0;
3945 if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
3947 !PageHighMem(skb_frag_page(frag0))) {
3948 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
3949 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
3953 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
3955 struct skb_shared_info *pinfo = skb_shinfo(skb);
3957 BUG_ON(skb->end - skb->tail < grow);
3959 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3961 skb->data_len -= grow;
3964 pinfo->frags[0].page_offset += grow;
3965 skb_frag_size_sub(&pinfo->frags[0], grow);
3967 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
3968 skb_frag_unref(skb, 0);
3969 memmove(pinfo->frags, pinfo->frags + 1,
3970 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
3974 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3976 struct sk_buff **pp = NULL;
3977 struct packet_offload *ptype;
3978 __be16 type = skb->protocol;
3979 struct list_head *head = &offload_base;
3981 enum gro_result ret;
3984 if (!(skb->dev->features & NETIF_F_GRO))
3987 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3990 gro_list_prepare(napi, skb);
3993 list_for_each_entry_rcu(ptype, head, list) {
3994 if (ptype->type != type || !ptype->callbacks.gro_receive)
3997 skb_set_network_header(skb, skb_gro_offset(skb));
3998 skb_reset_mac_len(skb);
3999 NAPI_GRO_CB(skb)->same_flow = 0;
4000 NAPI_GRO_CB(skb)->flush = 0;
4001 NAPI_GRO_CB(skb)->free = 0;
4002 NAPI_GRO_CB(skb)->udp_mark = 0;
4004 /* Setup for GRO checksum validation */
4005 switch (skb->ip_summed) {
4006 case CHECKSUM_COMPLETE:
4007 NAPI_GRO_CB(skb)->csum = skb->csum;
4008 NAPI_GRO_CB(skb)->csum_valid = 1;
4009 NAPI_GRO_CB(skb)->csum_cnt = 0;
4011 case CHECKSUM_UNNECESSARY:
4012 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
4013 NAPI_GRO_CB(skb)->csum_valid = 0;
4016 NAPI_GRO_CB(skb)->csum_cnt = 0;
4017 NAPI_GRO_CB(skb)->csum_valid = 0;
4020 pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
4025 if (&ptype->list == head)
4028 same_flow = NAPI_GRO_CB(skb)->same_flow;
4029 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
4032 struct sk_buff *nskb = *pp;
4036 napi_gro_complete(nskb);
4043 if (NAPI_GRO_CB(skb)->flush)
4046 if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
4047 struct sk_buff *nskb = napi->gro_list;
4049 /* locate the end of the list to select the 'oldest' flow */
4050 while (nskb->next) {
4056 napi_gro_complete(nskb);
4060 NAPI_GRO_CB(skb)->count = 1;
4061 NAPI_GRO_CB(skb)->age = jiffies;
4062 NAPI_GRO_CB(skb)->last = skb;
4063 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
4064 skb->next = napi->gro_list;
4065 napi->gro_list = skb;
4069 grow = skb_gro_offset(skb) - skb_headlen(skb);
4071 gro_pull_from_frag0(skb, grow);
4080 struct packet_offload *gro_find_receive_by_type(__be16 type)
4082 struct list_head *offload_head = &offload_base;
4083 struct packet_offload *ptype;
4085 list_for_each_entry_rcu(ptype, offload_head, list) {
4086 if (ptype->type != type || !ptype->callbacks.gro_receive)
4092 EXPORT_SYMBOL(gro_find_receive_by_type);
4094 struct packet_offload *gro_find_complete_by_type(__be16 type)
4096 struct list_head *offload_head = &offload_base;
4097 struct packet_offload *ptype;
4099 list_for_each_entry_rcu(ptype, offload_head, list) {
4100 if (ptype->type != type || !ptype->callbacks.gro_complete)
4106 EXPORT_SYMBOL(gro_find_complete_by_type);
4108 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
4112 if (netif_receive_skb_internal(skb))
4120 case GRO_MERGED_FREE:
4121 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
4122 kmem_cache_free(skbuff_head_cache, skb);
4135 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4137 trace_napi_gro_receive_entry(skb);
4139 skb_gro_reset_offset(skb);
4141 return napi_skb_finish(dev_gro_receive(napi, skb), skb);
4143 EXPORT_SYMBOL(napi_gro_receive);
4145 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
4147 __skb_pull(skb, skb_headlen(skb));
4148 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4149 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
4151 skb->dev = napi->dev;
4153 skb->encapsulation = 0;
4154 skb_shinfo(skb)->gso_type = 0;
4155 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
4160 struct sk_buff *napi_get_frags(struct napi_struct *napi)
4162 struct sk_buff *skb = napi->skb;
4165 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
4170 EXPORT_SYMBOL(napi_get_frags);
4172 static gro_result_t napi_frags_finish(struct napi_struct *napi,
4173 struct sk_buff *skb,
4179 __skb_push(skb, ETH_HLEN);
4180 skb->protocol = eth_type_trans(skb, skb->dev);
4181 if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
4186 case GRO_MERGED_FREE:
4187 napi_reuse_skb(napi, skb);
4197 /* Upper GRO stack assumes network header starts at gro_offset=0
4198 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4199 * We copy ethernet header into skb->data to have a common layout.
4201 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
4203 struct sk_buff *skb = napi->skb;
4204 const struct ethhdr *eth;
4205 unsigned int hlen = sizeof(*eth);
4209 skb_reset_mac_header(skb);
4210 skb_gro_reset_offset(skb);
4212 eth = skb_gro_header_fast(skb, 0);
4213 if (unlikely(skb_gro_header_hard(skb, hlen))) {
4214 eth = skb_gro_header_slow(skb, hlen, 0);
4215 if (unlikely(!eth)) {
4216 napi_reuse_skb(napi, skb);
4220 gro_pull_from_frag0(skb, hlen);
4221 NAPI_GRO_CB(skb)->frag0 += hlen;
4222 NAPI_GRO_CB(skb)->frag0_len -= hlen;
4224 __skb_pull(skb, hlen);
4227 * This works because the only protocols we care about don't require
4229 * We'll fix it up properly in napi_frags_finish()
4231 skb->protocol = eth->h_proto;
4236 gro_result_t napi_gro_frags(struct napi_struct *napi)
4238 struct sk_buff *skb = napi_frags_skb(napi);
4243 trace_napi_gro_frags_entry(skb);
4245 return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
4247 EXPORT_SYMBOL(napi_gro_frags);
4249 /* Compute the checksum from gro_offset and return the folded value
4250 * after adding in any pseudo checksum.
4252 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
4257 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
4259 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4260 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
4262 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
4263 !skb->csum_complete_sw)
4264 netdev_rx_csum_fault(skb->dev);
4267 NAPI_GRO_CB(skb)->csum = wsum;
4268 NAPI_GRO_CB(skb)->csum_valid = 1;
4272 EXPORT_SYMBOL(__skb_gro_checksum_complete);
4275 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4276 * Note: called with local irq disabled, but exits with local irq enabled.
4278 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
4281 struct softnet_data *remsd = sd->rps_ipi_list;
4284 sd->rps_ipi_list = NULL;
4288 /* Send pending IPI's to kick RPS processing on remote cpus. */
4290 struct softnet_data *next = remsd->rps_ipi_next;
4292 if (cpu_online(remsd->cpu))
4293 smp_call_function_single_async(remsd->cpu,
4302 static int process_backlog(struct napi_struct *napi, int quota)
4305 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
4308 /* Check if we have pending ipi, its better to send them now,
4309 * not waiting net_rx_action() end.
4311 if (sd->rps_ipi_list) {
4312 local_irq_disable();
4313 net_rps_action_and_irq_enable(sd);
4316 napi->weight = weight_p;
4317 local_irq_disable();
4319 struct sk_buff *skb;
4321 while ((skb = __skb_dequeue(&sd->process_queue))) {
4323 __netif_receive_skb(skb);
4324 local_irq_disable();
4325 input_queue_head_incr(sd);
4326 if (++work >= quota) {
4333 if (skb_queue_empty(&sd->input_pkt_queue)) {
4335 * Inline a custom version of __napi_complete().
4336 * only current cpu owns and manipulates this napi,
4337 * and NAPI_STATE_SCHED is the only possible flag set
4339 * We can use a plain write instead of clear_bit(),
4340 * and we dont need an smp_mb() memory barrier.
4342 list_del(&napi->poll_list);
4349 skb_queue_splice_tail_init(&sd->input_pkt_queue,
4350 &sd->process_queue);
4359 * __napi_schedule - schedule for receive
4360 * @n: entry to schedule
4362 * The entry's receive function will be scheduled to run
4364 void __napi_schedule(struct napi_struct *n)
4366 unsigned long flags;
4368 local_irq_save(flags);
4369 ____napi_schedule(&__get_cpu_var(softnet_data), n);
4370 local_irq_restore(flags);
4372 EXPORT_SYMBOL(__napi_schedule);
4374 void __napi_complete(struct napi_struct *n)
4376 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
4377 BUG_ON(n->gro_list);
4379 list_del(&n->poll_list);
4380 smp_mb__before_atomic();
4381 clear_bit(NAPI_STATE_SCHED, &n->state);
4383 EXPORT_SYMBOL(__napi_complete);
4385 void napi_complete(struct napi_struct *n)
4387 unsigned long flags;
4390 * don't let napi dequeue from the cpu poll list
4391 * just in case its running on a different cpu
4393 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
4396 napi_gro_flush(n, false);
4397 local_irq_save(flags);
4399 local_irq_restore(flags);
4401 EXPORT_SYMBOL(napi_complete);
4403 /* must be called under rcu_read_lock(), as we dont take a reference */
4404 struct napi_struct *napi_by_id(unsigned int napi_id)
4406 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
4407 struct napi_struct *napi;
4409 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
4410 if (napi->napi_id == napi_id)
4415 EXPORT_SYMBOL_GPL(napi_by_id);
4417 void napi_hash_add(struct napi_struct *napi)
4419 if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) {
4421 spin_lock(&napi_hash_lock);
4423 /* 0 is not a valid id, we also skip an id that is taken
4424 * we expect both events to be extremely rare
4427 while (!napi->napi_id) {
4428 napi->napi_id = ++napi_gen_id;
4429 if (napi_by_id(napi->napi_id))
4433 hlist_add_head_rcu(&napi->napi_hash_node,
4434 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
4436 spin_unlock(&napi_hash_lock);
4439 EXPORT_SYMBOL_GPL(napi_hash_add);
4441 /* Warning : caller is responsible to make sure rcu grace period
4442 * is respected before freeing memory containing @napi
4444 void napi_hash_del(struct napi_struct *napi)
4446 spin_lock(&napi_hash_lock);
4448 if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state))
4449 hlist_del_rcu(&napi->napi_hash_node);
4451 spin_unlock(&napi_hash_lock);
4453 EXPORT_SYMBOL_GPL(napi_hash_del);
4455 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
4456 int (*poll)(struct napi_struct *, int), int weight)
4458 INIT_LIST_HEAD(&napi->poll_list);
4459 napi->gro_count = 0;
4460 napi->gro_list = NULL;
4463 if (weight > NAPI_POLL_WEIGHT)
4464 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4466 napi->weight = weight;
4467 list_add(&napi->dev_list, &dev->napi_list);
4469 #ifdef CONFIG_NETPOLL
4470 spin_lock_init(&napi->poll_lock);
4471 napi->poll_owner = -1;
4473 set_bit(NAPI_STATE_SCHED, &napi->state);
4475 EXPORT_SYMBOL(netif_napi_add);
4477 void netif_napi_del(struct napi_struct *napi)
4479 list_del_init(&napi->dev_list);
4480 napi_free_frags(napi);
4482 kfree_skb_list(napi->gro_list);
4483 napi->gro_list = NULL;
4484 napi->gro_count = 0;
4486 EXPORT_SYMBOL(netif_napi_del);
4488 static void net_rx_action(struct softirq_action *h)
4490 struct softnet_data *sd = &__get_cpu_var(softnet_data);
4491 unsigned long time_limit = jiffies + 2;
4492 int budget = netdev_budget;
4495 local_irq_disable();
4497 while (!list_empty(&sd->poll_list)) {
4498 struct napi_struct *n;
4501 /* If softirq window is exhuasted then punt.
4502 * Allow this to run for 2 jiffies since which will allow
4503 * an average latency of 1.5/HZ.
4505 if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit)))
4510 /* Even though interrupts have been re-enabled, this
4511 * access is safe because interrupts can only add new
4512 * entries to the tail of this list, and only ->poll()
4513 * calls can remove this head entry from the list.
4515 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
4517 have = netpoll_poll_lock(n);
4521 /* This NAPI_STATE_SCHED test is for avoiding a race
4522 * with netpoll's poll_napi(). Only the entity which
4523 * obtains the lock and sees NAPI_STATE_SCHED set will
4524 * actually make the ->poll() call. Therefore we avoid
4525 * accidentally calling ->poll() when NAPI is not scheduled.
4528 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
4529 work = n->poll(n, weight);
4533 WARN_ON_ONCE(work > weight);
4537 local_irq_disable();
4539 /* Drivers must not modify the NAPI state if they
4540 * consume the entire weight. In such cases this code
4541 * still "owns" the NAPI instance and therefore can
4542 * move the instance around on the list at-will.
4544 if (unlikely(work == weight)) {
4545 if (unlikely(napi_disable_pending(n))) {
4548 local_irq_disable();
4551 /* flush too old packets
4552 * If HZ < 1000, flush all packets.
4555 napi_gro_flush(n, HZ >= 1000);
4556 local_irq_disable();
4558 list_move_tail(&n->poll_list, &sd->poll_list);
4562 netpoll_poll_unlock(have);
4565 net_rps_action_and_irq_enable(sd);
4567 #ifdef CONFIG_NET_DMA
4569 * There may not be any more sk_buffs coming right now, so push
4570 * any pending DMA copies to hardware
4572 dma_issue_pending_all();
4579 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4583 struct netdev_adjacent {
4584 struct net_device *dev;
4586 /* upper master flag, there can only be one master device per list */
4589 /* counter for the number of times this device was added to us */
4592 /* private field for the users */
4595 struct list_head list;
4596 struct rcu_head rcu;
4599 static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev,
4600 struct net_device *adj_dev,
4601 struct list_head *adj_list)
4603 struct netdev_adjacent *adj;
4605 list_for_each_entry(adj, adj_list, list) {
4606 if (adj->dev == adj_dev)
4613 * netdev_has_upper_dev - Check if device is linked to an upper device
4615 * @upper_dev: upper device to check
4617 * Find out if a device is linked to specified upper device and return true
4618 * in case it is. Note that this checks only immediate upper device,
4619 * not through a complete stack of devices. The caller must hold the RTNL lock.
4621 bool netdev_has_upper_dev(struct net_device *dev,
4622 struct net_device *upper_dev)
4626 return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper);
4628 EXPORT_SYMBOL(netdev_has_upper_dev);
4631 * netdev_has_any_upper_dev - Check if device is linked to some device
4634 * Find out if a device is linked to an upper device and return true in case
4635 * it is. The caller must hold the RTNL lock.
4637 static bool netdev_has_any_upper_dev(struct net_device *dev)
4641 return !list_empty(&dev->all_adj_list.upper);
4645 * netdev_master_upper_dev_get - Get master upper device
4648 * Find a master upper device and return pointer to it or NULL in case
4649 * it's not there. The caller must hold the RTNL lock.
4651 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
4653 struct netdev_adjacent *upper;
4657 if (list_empty(&dev->adj_list.upper))
4660 upper = list_first_entry(&dev->adj_list.upper,
4661 struct netdev_adjacent, list);
4662 if (likely(upper->master))
4666 EXPORT_SYMBOL(netdev_master_upper_dev_get);
4668 void *netdev_adjacent_get_private(struct list_head *adj_list)
4670 struct netdev_adjacent *adj;
4672 adj = list_entry(adj_list, struct netdev_adjacent, list);
4674 return adj->private;
4676 EXPORT_SYMBOL(netdev_adjacent_get_private);
4679 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
4681 * @iter: list_head ** of the current position
4683 * Gets the next device from the dev's upper list, starting from iter
4684 * position. The caller must hold RCU read lock.
4686 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
4687 struct list_head **iter)
4689 struct netdev_adjacent *upper;
4691 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4693 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
4695 if (&upper->list == &dev->adj_list.upper)
4698 *iter = &upper->list;
4702 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
4705 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
4707 * @iter: list_head ** of the current position
4709 * Gets the next device from the dev's upper list, starting from iter
4710 * position. The caller must hold RCU read lock.
4712 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
4713 struct list_head **iter)
4715 struct netdev_adjacent *upper;
4717 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
4719 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
4721 if (&upper->list == &dev->all_adj_list.upper)
4724 *iter = &upper->list;
4728 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu);
4731 * netdev_lower_get_next_private - Get the next ->private from the
4732 * lower neighbour list
4734 * @iter: list_head ** of the current position
4736 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4737 * list, starting from iter position. The caller must hold either hold the
4738 * RTNL lock or its own locking that guarantees that the neighbour lower
4739 * list will remain unchainged.
4741 void *netdev_lower_get_next_private(struct net_device *dev,
4742 struct list_head **iter)
4744 struct netdev_adjacent *lower;
4746 lower = list_entry(*iter, struct netdev_adjacent, list);
4748 if (&lower->list == &dev->adj_list.lower)
4751 *iter = lower->list.next;
4753 return lower->private;
4755 EXPORT_SYMBOL(netdev_lower_get_next_private);
4758 * netdev_lower_get_next_private_rcu - Get the next ->private from the
4759 * lower neighbour list, RCU
4762 * @iter: list_head ** of the current position
4764 * Gets the next netdev_adjacent->private from the dev's lower neighbour
4765 * list, starting from iter position. The caller must hold RCU read lock.
4767 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
4768 struct list_head **iter)
4770 struct netdev_adjacent *lower;
4772 WARN_ON_ONCE(!rcu_read_lock_held());
4774 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
4776 if (&lower->list == &dev->adj_list.lower)
4779 *iter = &lower->list;
4781 return lower->private;
4783 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
4786 * netdev_lower_get_next - Get the next device from the lower neighbour
4789 * @iter: list_head ** of the current position
4791 * Gets the next netdev_adjacent from the dev's lower neighbour
4792 * list, starting from iter position. The caller must hold RTNL lock or
4793 * its own locking that guarantees that the neighbour lower
4794 * list will remain unchainged.
4796 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
4798 struct netdev_adjacent *lower;
4800 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
4802 if (&lower->list == &dev->adj_list.lower)
4805 *iter = &lower->list;
4809 EXPORT_SYMBOL(netdev_lower_get_next);
4812 * netdev_lower_get_first_private_rcu - Get the first ->private from the
4813 * lower neighbour list, RCU
4817 * Gets the first netdev_adjacent->private from the dev's lower neighbour
4818 * list. The caller must hold RCU read lock.
4820 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
4822 struct netdev_adjacent *lower;
4824 lower = list_first_or_null_rcu(&dev->adj_list.lower,
4825 struct netdev_adjacent, list);
4827 return lower->private;
4830 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
4833 * netdev_master_upper_dev_get_rcu - Get master upper device
4836 * Find a master upper device and return pointer to it or NULL in case
4837 * it's not there. The caller must hold the RCU read lock.
4839 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
4841 struct netdev_adjacent *upper;
4843 upper = list_first_or_null_rcu(&dev->adj_list.upper,
4844 struct netdev_adjacent, list);
4845 if (upper && likely(upper->master))
4849 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
4851 static int netdev_adjacent_sysfs_add(struct net_device *dev,
4852 struct net_device *adj_dev,
4853 struct list_head *dev_list)
4855 char linkname[IFNAMSIZ+7];
4856 sprintf(linkname, dev_list == &dev->adj_list.upper ?
4857 "upper_%s" : "lower_%s", adj_dev->name);
4858 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
4861 static void netdev_adjacent_sysfs_del(struct net_device *dev,
4863 struct list_head *dev_list)
4865 char linkname[IFNAMSIZ+7];
4866 sprintf(linkname, dev_list == &dev->adj_list.upper ?
4867 "upper_%s" : "lower_%s", name);
4868 sysfs_remove_link(&(dev->dev.kobj), linkname);
4871 #define netdev_adjacent_is_neigh_list(dev, dev_list) \
4872 (dev_list == &dev->adj_list.upper || \
4873 dev_list == &dev->adj_list.lower)
4875 static int __netdev_adjacent_dev_insert(struct net_device *dev,
4876 struct net_device *adj_dev,
4877 struct list_head *dev_list,
4878 void *private, bool master)
4880 struct netdev_adjacent *adj;
4883 adj = __netdev_find_adj(dev, adj_dev, dev_list);
4890 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
4895 adj->master = master;
4897 adj->private = private;
4900 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
4901 adj_dev->name, dev->name, adj_dev->name);
4903 if (netdev_adjacent_is_neigh_list(dev, dev_list)) {
4904 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
4909 /* Ensure that master link is always the first item in list. */
4911 ret = sysfs_create_link(&(dev->dev.kobj),
4912 &(adj_dev->dev.kobj), "master");
4914 goto remove_symlinks;
4916 list_add_rcu(&adj->list, dev_list);
4918 list_add_tail_rcu(&adj->list, dev_list);
4924 if (netdev_adjacent_is_neigh_list(dev, dev_list))
4925 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
4933 static void __netdev_adjacent_dev_remove(struct net_device *dev,
4934 struct net_device *adj_dev,
4935 struct list_head *dev_list)
4937 struct netdev_adjacent *adj;
4939 adj = __netdev_find_adj(dev, adj_dev, dev_list);
4942 pr_err("tried to remove device %s from %s\n",
4943 dev->name, adj_dev->name);
4947 if (adj->ref_nr > 1) {
4948 pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name,
4955 sysfs_remove_link(&(dev->dev.kobj), "master");
4957 if (netdev_adjacent_is_neigh_list(dev, dev_list))
4958 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
4960 list_del_rcu(&adj->list);
4961 pr_debug("dev_put for %s, because link removed from %s to %s\n",
4962 adj_dev->name, dev->name, adj_dev->name);
4964 kfree_rcu(adj, rcu);
4967 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
4968 struct net_device *upper_dev,
4969 struct list_head *up_list,
4970 struct list_head *down_list,
4971 void *private, bool master)
4975 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private,
4980 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private,
4983 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
4990 static int __netdev_adjacent_dev_link(struct net_device *dev,
4991 struct net_device *upper_dev)
4993 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
4994 &dev->all_adj_list.upper,
4995 &upper_dev->all_adj_list.lower,
4999 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
5000 struct net_device *upper_dev,
5001 struct list_head *up_list,
5002 struct list_head *down_list)
5004 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5005 __netdev_adjacent_dev_remove(upper_dev, dev, down_list);
5008 static void __netdev_adjacent_dev_unlink(struct net_device *dev,
5009 struct net_device *upper_dev)
5011 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5012 &dev->all_adj_list.upper,
5013 &upper_dev->all_adj_list.lower);
5016 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
5017 struct net_device *upper_dev,
5018 void *private, bool master)
5020 int ret = __netdev_adjacent_dev_link(dev, upper_dev);
5025 ret = __netdev_adjacent_dev_link_lists(dev, upper_dev,
5026 &dev->adj_list.upper,
5027 &upper_dev->adj_list.lower,
5030 __netdev_adjacent_dev_unlink(dev, upper_dev);
5037 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
5038 struct net_device *upper_dev)
5040 __netdev_adjacent_dev_unlink(dev, upper_dev);
5041 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5042 &dev->adj_list.upper,
5043 &upper_dev->adj_list.lower);
5046 static int __netdev_upper_dev_link(struct net_device *dev,
5047 struct net_device *upper_dev, bool master,
5050 struct netdev_adjacent *i, *j, *to_i, *to_j;
5055 if (dev == upper_dev)
5058 /* To prevent loops, check if dev is not upper device to upper_dev. */
5059 if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper))
5062 if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper))
5065 if (master && netdev_master_upper_dev_get(dev))
5068 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private,
5073 /* Now that we linked these devs, make all the upper_dev's
5074 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5075 * versa, and don't forget the devices itself. All of these
5076 * links are non-neighbours.
5078 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5079 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5080 pr_debug("Interlinking %s with %s, non-neighbour\n",
5081 i->dev->name, j->dev->name);
5082 ret = __netdev_adjacent_dev_link(i->dev, j->dev);
5088 /* add dev to every upper_dev's upper device */
5089 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5090 pr_debug("linking %s's upper device %s with %s\n",
5091 upper_dev->name, i->dev->name, dev->name);
5092 ret = __netdev_adjacent_dev_link(dev, i->dev);
5094 goto rollback_upper_mesh;
5097 /* add upper_dev to every dev's lower device */
5098 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5099 pr_debug("linking %s's lower device %s with %s\n", dev->name,
5100 i->dev->name, upper_dev->name);
5101 ret = __netdev_adjacent_dev_link(i->dev, upper_dev);
5103 goto rollback_lower_mesh;
5106 call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
5109 rollback_lower_mesh:
5111 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5114 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5119 rollback_upper_mesh:
5121 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5124 __netdev_adjacent_dev_unlink(dev, i->dev);
5132 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5133 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5134 if (i == to_i && j == to_j)
5136 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5142 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5148 * netdev_upper_dev_link - Add a link to the upper device
5150 * @upper_dev: new upper device
5152 * Adds a link to device which is upper to this one. The caller must hold
5153 * the RTNL lock. On a failure a negative errno code is returned.
5154 * On success the reference counts are adjusted and the function
5157 int netdev_upper_dev_link(struct net_device *dev,
5158 struct net_device *upper_dev)
5160 return __netdev_upper_dev_link(dev, upper_dev, false, NULL);
5162 EXPORT_SYMBOL(netdev_upper_dev_link);
5165 * netdev_master_upper_dev_link - Add a master link to the upper device
5167 * @upper_dev: new upper device
5169 * Adds a link to device which is upper to this one. In this case, only
5170 * one master upper device can be linked, although other non-master devices
5171 * might be linked as well. The caller must hold the RTNL lock.
5172 * On a failure a negative errno code is returned. On success the reference
5173 * counts are adjusted and the function returns zero.
5175 int netdev_master_upper_dev_link(struct net_device *dev,
5176 struct net_device *upper_dev)
5178 return __netdev_upper_dev_link(dev, upper_dev, true, NULL);
5180 EXPORT_SYMBOL(netdev_master_upper_dev_link);
5182 int netdev_master_upper_dev_link_private(struct net_device *dev,
5183 struct net_device *upper_dev,
5186 return __netdev_upper_dev_link(dev, upper_dev, true, private);
5188 EXPORT_SYMBOL(netdev_master_upper_dev_link_private);
5191 * netdev_upper_dev_unlink - Removes a link to upper device
5193 * @upper_dev: new upper device
5195 * Removes a link to device which is upper to this one. The caller must hold
5198 void netdev_upper_dev_unlink(struct net_device *dev,
5199 struct net_device *upper_dev)
5201 struct netdev_adjacent *i, *j;
5204 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5206 /* Here is the tricky part. We must remove all dev's lower
5207 * devices from all upper_dev's upper devices and vice
5208 * versa, to maintain the graph relationship.
5210 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5211 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list)
5212 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5214 /* remove also the devices itself from lower/upper device
5217 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5218 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5220 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
5221 __netdev_adjacent_dev_unlink(dev, i->dev);
5223 call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
5225 EXPORT_SYMBOL(netdev_upper_dev_unlink);
5227 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
5229 struct netdev_adjacent *iter;
5231 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5232 netdev_adjacent_sysfs_del(iter->dev, oldname,
5233 &iter->dev->adj_list.lower);
5234 netdev_adjacent_sysfs_add(iter->dev, dev,
5235 &iter->dev->adj_list.lower);
5238 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5239 netdev_adjacent_sysfs_del(iter->dev, oldname,
5240 &iter->dev->adj_list.upper);
5241 netdev_adjacent_sysfs_add(iter->dev, dev,
5242 &iter->dev->adj_list.upper);
5246 void *netdev_lower_dev_get_private(struct net_device *dev,
5247 struct net_device *lower_dev)
5249 struct netdev_adjacent *lower;
5253 lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower);
5257 return lower->private;
5259 EXPORT_SYMBOL(netdev_lower_dev_get_private);
5262 int dev_get_nest_level(struct net_device *dev,
5263 bool (*type_check)(struct net_device *dev))
5265 struct net_device *lower = NULL;
5266 struct list_head *iter;
5272 netdev_for_each_lower_dev(dev, lower, iter) {
5273 nest = dev_get_nest_level(lower, type_check);
5274 if (max_nest < nest)
5278 if (type_check(dev))
5283 EXPORT_SYMBOL(dev_get_nest_level);
5285 static void dev_change_rx_flags(struct net_device *dev, int flags)
5287 const struct net_device_ops *ops = dev->netdev_ops;
5289 if (ops->ndo_change_rx_flags)
5290 ops->ndo_change_rx_flags(dev, flags);
5293 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
5295 unsigned int old_flags = dev->flags;
5301 dev->flags |= IFF_PROMISC;
5302 dev->promiscuity += inc;
5303 if (dev->promiscuity == 0) {
5306 * If inc causes overflow, untouch promisc and return error.
5309 dev->flags &= ~IFF_PROMISC;
5311 dev->promiscuity -= inc;
5312 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5317 if (dev->flags != old_flags) {
5318 pr_info("device %s %s promiscuous mode\n",
5320 dev->flags & IFF_PROMISC ? "entered" : "left");
5321 if (audit_enabled) {
5322 current_uid_gid(&uid, &gid);
5323 audit_log(current->audit_context, GFP_ATOMIC,
5324 AUDIT_ANOM_PROMISCUOUS,
5325 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5326 dev->name, (dev->flags & IFF_PROMISC),
5327 (old_flags & IFF_PROMISC),
5328 from_kuid(&init_user_ns, audit_get_loginuid(current)),
5329 from_kuid(&init_user_ns, uid),
5330 from_kgid(&init_user_ns, gid),
5331 audit_get_sessionid(current));
5334 dev_change_rx_flags(dev, IFF_PROMISC);
5337 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
5342 * dev_set_promiscuity - update promiscuity count on a device
5346 * Add or remove promiscuity from a device. While the count in the device
5347 * remains above zero the interface remains promiscuous. Once it hits zero
5348 * the device reverts back to normal filtering operation. A negative inc
5349 * value is used to drop promiscuity on the device.
5350 * Return 0 if successful or a negative errno code on error.
5352 int dev_set_promiscuity(struct net_device *dev, int inc)
5354 unsigned int old_flags = dev->flags;
5357 err = __dev_set_promiscuity(dev, inc, true);
5360 if (dev->flags != old_flags)
5361 dev_set_rx_mode(dev);
5364 EXPORT_SYMBOL(dev_set_promiscuity);
5366 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
5368 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
5372 dev->flags |= IFF_ALLMULTI;
5373 dev->allmulti += inc;
5374 if (dev->allmulti == 0) {
5377 * If inc causes overflow, untouch allmulti and return error.
5380 dev->flags &= ~IFF_ALLMULTI;
5382 dev->allmulti -= inc;
5383 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5388 if (dev->flags ^ old_flags) {
5389 dev_change_rx_flags(dev, IFF_ALLMULTI);
5390 dev_set_rx_mode(dev);
5392 __dev_notify_flags(dev, old_flags,
5393 dev->gflags ^ old_gflags);
5399 * dev_set_allmulti - update allmulti count on a device
5403 * Add or remove reception of all multicast frames to a device. While the
5404 * count in the device remains above zero the interface remains listening
5405 * to all interfaces. Once it hits zero the device reverts back to normal
5406 * filtering operation. A negative @inc value is used to drop the counter
5407 * when releasing a resource needing all multicasts.
5408 * Return 0 if successful or a negative errno code on error.
5411 int dev_set_allmulti(struct net_device *dev, int inc)
5413 return __dev_set_allmulti(dev, inc, true);
5415 EXPORT_SYMBOL(dev_set_allmulti);
5418 * Upload unicast and multicast address lists to device and
5419 * configure RX filtering. When the device doesn't support unicast
5420 * filtering it is put in promiscuous mode while unicast addresses
5423 void __dev_set_rx_mode(struct net_device *dev)
5425 const struct net_device_ops *ops = dev->netdev_ops;
5427 /* dev_open will call this function so the list will stay sane. */
5428 if (!(dev->flags&IFF_UP))
5431 if (!netif_device_present(dev))
5434 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
5435 /* Unicast addresses changes may only happen under the rtnl,
5436 * therefore calling __dev_set_promiscuity here is safe.
5438 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
5439 __dev_set_promiscuity(dev, 1, false);
5440 dev->uc_promisc = true;
5441 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
5442 __dev_set_promiscuity(dev, -1, false);
5443 dev->uc_promisc = false;
5447 if (ops->ndo_set_rx_mode)
5448 ops->ndo_set_rx_mode(dev);
5451 void dev_set_rx_mode(struct net_device *dev)
5453 netif_addr_lock_bh(dev);
5454 __dev_set_rx_mode(dev);
5455 netif_addr_unlock_bh(dev);
5459 * dev_get_flags - get flags reported to userspace
5462 * Get the combination of flag bits exported through APIs to userspace.
5464 unsigned int dev_get_flags(const struct net_device *dev)
5468 flags = (dev->flags & ~(IFF_PROMISC |
5473 (dev->gflags & (IFF_PROMISC |
5476 if (netif_running(dev)) {
5477 if (netif_oper_up(dev))
5478 flags |= IFF_RUNNING;
5479 if (netif_carrier_ok(dev))
5480 flags |= IFF_LOWER_UP;
5481 if (netif_dormant(dev))
5482 flags |= IFF_DORMANT;
5487 EXPORT_SYMBOL(dev_get_flags);
5489 int __dev_change_flags(struct net_device *dev, unsigned int flags)
5491 unsigned int old_flags = dev->flags;
5497 * Set the flags on our device.
5500 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
5501 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
5503 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
5507 * Load in the correct multicast list now the flags have changed.
5510 if ((old_flags ^ flags) & IFF_MULTICAST)
5511 dev_change_rx_flags(dev, IFF_MULTICAST);
5513 dev_set_rx_mode(dev);
5516 * Have we downed the interface. We handle IFF_UP ourselves
5517 * according to user attempts to set it, rather than blindly
5522 if ((old_flags ^ flags) & IFF_UP)
5523 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
5525 if ((flags ^ dev->gflags) & IFF_PROMISC) {
5526 int inc = (flags & IFF_PROMISC) ? 1 : -1;
5527 unsigned int old_flags = dev->flags;
5529 dev->gflags ^= IFF_PROMISC;
5531 if (__dev_set_promiscuity(dev, inc, false) >= 0)
5532 if (dev->flags != old_flags)
5533 dev_set_rx_mode(dev);
5536 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5537 is important. Some (broken) drivers set IFF_PROMISC, when
5538 IFF_ALLMULTI is requested not asking us and not reporting.
5540 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
5541 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
5543 dev->gflags ^= IFF_ALLMULTI;
5544 __dev_set_allmulti(dev, inc, false);
5550 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
5551 unsigned int gchanges)
5553 unsigned int changes = dev->flags ^ old_flags;
5556 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
5558 if (changes & IFF_UP) {
5559 if (dev->flags & IFF_UP)
5560 call_netdevice_notifiers(NETDEV_UP, dev);
5562 call_netdevice_notifiers(NETDEV_DOWN, dev);
5565 if (dev->flags & IFF_UP &&
5566 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
5567 struct netdev_notifier_change_info change_info;
5569 change_info.flags_changed = changes;
5570 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
5576 * dev_change_flags - change device settings
5578 * @flags: device state flags
5580 * Change settings on device based state flags. The flags are
5581 * in the userspace exported format.
5583 int dev_change_flags(struct net_device *dev, unsigned int flags)
5586 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
5588 ret = __dev_change_flags(dev, flags);
5592 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
5593 __dev_notify_flags(dev, old_flags, changes);
5596 EXPORT_SYMBOL(dev_change_flags);
5598 static int __dev_set_mtu(struct net_device *dev, int new_mtu)
5600 const struct net_device_ops *ops = dev->netdev_ops;
5602 if (ops->ndo_change_mtu)
5603 return ops->ndo_change_mtu(dev, new_mtu);
5610 * dev_set_mtu - Change maximum transfer unit
5612 * @new_mtu: new transfer unit
5614 * Change the maximum transfer size of the network device.
5616 int dev_set_mtu(struct net_device *dev, int new_mtu)
5620 if (new_mtu == dev->mtu)
5623 /* MTU must be positive. */
5627 if (!netif_device_present(dev))
5630 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
5631 err = notifier_to_errno(err);
5635 orig_mtu = dev->mtu;
5636 err = __dev_set_mtu(dev, new_mtu);
5639 err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
5640 err = notifier_to_errno(err);
5642 /* setting mtu back and notifying everyone again,
5643 * so that they have a chance to revert changes.
5645 __dev_set_mtu(dev, orig_mtu);
5646 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
5651 EXPORT_SYMBOL(dev_set_mtu);
5654 * dev_set_group - Change group this device belongs to
5656 * @new_group: group this device should belong to
5658 void dev_set_group(struct net_device *dev, int new_group)
5660 dev->group = new_group;
5662 EXPORT_SYMBOL(dev_set_group);
5665 * dev_set_mac_address - Change Media Access Control Address
5669 * Change the hardware (MAC) address of the device
5671 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
5673 const struct net_device_ops *ops = dev->netdev_ops;
5676 if (!ops->ndo_set_mac_address)
5678 if (sa->sa_family != dev->type)
5680 if (!netif_device_present(dev))
5682 err = ops->ndo_set_mac_address(dev, sa);
5685 dev->addr_assign_type = NET_ADDR_SET;
5686 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
5687 add_device_randomness(dev->dev_addr, dev->addr_len);
5690 EXPORT_SYMBOL(dev_set_mac_address);
5693 * dev_change_carrier - Change device carrier
5695 * @new_carrier: new value
5697 * Change device carrier
5699 int dev_change_carrier(struct net_device *dev, bool new_carrier)
5701 const struct net_device_ops *ops = dev->netdev_ops;
5703 if (!ops->ndo_change_carrier)
5705 if (!netif_device_present(dev))
5707 return ops->ndo_change_carrier(dev, new_carrier);
5709 EXPORT_SYMBOL(dev_change_carrier);
5712 * dev_get_phys_port_id - Get device physical port ID
5716 * Get device physical port ID
5718 int dev_get_phys_port_id(struct net_device *dev,
5719 struct netdev_phys_port_id *ppid)
5721 const struct net_device_ops *ops = dev->netdev_ops;
5723 if (!ops->ndo_get_phys_port_id)
5725 return ops->ndo_get_phys_port_id(dev, ppid);
5727 EXPORT_SYMBOL(dev_get_phys_port_id);
5730 * dev_new_index - allocate an ifindex
5731 * @net: the applicable net namespace
5733 * Returns a suitable unique value for a new device interface
5734 * number. The caller must hold the rtnl semaphore or the
5735 * dev_base_lock to be sure it remains unique.
5737 static int dev_new_index(struct net *net)
5739 int ifindex = net->ifindex;
5743 if (!__dev_get_by_index(net, ifindex))
5744 return net->ifindex = ifindex;
5748 /* Delayed registration/unregisteration */
5749 static LIST_HEAD(net_todo_list);
5750 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
5752 static void net_set_todo(struct net_device *dev)
5754 list_add_tail(&dev->todo_list, &net_todo_list);
5755 dev_net(dev)->dev_unreg_count++;
5758 static void rollback_registered_many(struct list_head *head)
5760 struct net_device *dev, *tmp;
5761 LIST_HEAD(close_head);
5763 BUG_ON(dev_boot_phase);
5766 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5767 /* Some devices call without registering
5768 * for initialization unwind. Remove those
5769 * devices and proceed with the remaining.
5771 if (dev->reg_state == NETREG_UNINITIALIZED) {
5772 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5776 list_del(&dev->unreg_list);
5779 dev->dismantle = true;
5780 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5783 /* If device is running, close it first. */
5784 list_for_each_entry(dev, head, unreg_list)
5785 list_add_tail(&dev->close_list, &close_head);
5786 dev_close_many(&close_head);
5788 list_for_each_entry(dev, head, unreg_list) {
5789 /* And unlink it from device chain. */
5790 unlist_netdevice(dev);
5792 dev->reg_state = NETREG_UNREGISTERING;
5797 list_for_each_entry(dev, head, unreg_list) {
5798 /* Shutdown queueing discipline. */
5802 /* Notify protocols, that we are about to destroy
5803 this device. They should clean all the things.
5805 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5808 * Flush the unicast and multicast chains
5813 if (dev->netdev_ops->ndo_uninit)
5814 dev->netdev_ops->ndo_uninit(dev);
5816 if (!dev->rtnl_link_ops ||
5817 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5818 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
5820 /* Notifier chain MUST detach us all upper devices. */
5821 WARN_ON(netdev_has_any_upper_dev(dev));
5823 /* Remove entries from kobject tree */
5824 netdev_unregister_kobject(dev);
5826 /* Remove XPS queueing entries */
5827 netif_reset_xps_queues_gt(dev, 0);
5833 list_for_each_entry(dev, head, unreg_list)
5837 static void rollback_registered(struct net_device *dev)
5841 list_add(&dev->unreg_list, &single);
5842 rollback_registered_many(&single);
5846 static netdev_features_t netdev_fix_features(struct net_device *dev,
5847 netdev_features_t features)
5849 /* Fix illegal checksum combinations */
5850 if ((features & NETIF_F_HW_CSUM) &&
5851 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5852 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5853 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5856 /* TSO requires that SG is present as well. */
5857 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5858 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5859 features &= ~NETIF_F_ALL_TSO;
5862 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
5863 !(features & NETIF_F_IP_CSUM)) {
5864 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
5865 features &= ~NETIF_F_TSO;
5866 features &= ~NETIF_F_TSO_ECN;
5869 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
5870 !(features & NETIF_F_IPV6_CSUM)) {
5871 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
5872 features &= ~NETIF_F_TSO6;
5875 /* TSO ECN requires that TSO is present as well. */
5876 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5877 features &= ~NETIF_F_TSO_ECN;
5879 /* Software GSO depends on SG. */
5880 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5881 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5882 features &= ~NETIF_F_GSO;
5885 /* UFO needs SG and checksumming */
5886 if (features & NETIF_F_UFO) {
5887 /* maybe split UFO into V4 and V6? */
5888 if (!((features & NETIF_F_GEN_CSUM) ||
5889 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5890 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5892 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5893 features &= ~NETIF_F_UFO;
5896 if (!(features & NETIF_F_SG)) {
5898 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5899 features &= ~NETIF_F_UFO;
5903 #ifdef CONFIG_NET_RX_BUSY_POLL
5904 if (dev->netdev_ops->ndo_busy_poll)
5905 features |= NETIF_F_BUSY_POLL;
5908 features &= ~NETIF_F_BUSY_POLL;
5913 int __netdev_update_features(struct net_device *dev)
5915 netdev_features_t features;
5920 features = netdev_get_wanted_features(dev);
5922 if (dev->netdev_ops->ndo_fix_features)
5923 features = dev->netdev_ops->ndo_fix_features(dev, features);
5925 /* driver might be less strict about feature dependencies */
5926 features = netdev_fix_features(dev, features);
5928 if (dev->features == features)
5931 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
5932 &dev->features, &features);
5934 if (dev->netdev_ops->ndo_set_features)
5935 err = dev->netdev_ops->ndo_set_features(dev, features);
5937 if (unlikely(err < 0)) {
5939 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5940 err, &features, &dev->features);
5945 dev->features = features;
5951 * netdev_update_features - recalculate device features
5952 * @dev: the device to check
5954 * Recalculate dev->features set and send notifications if it
5955 * has changed. Should be called after driver or hardware dependent
5956 * conditions might have changed that influence the features.
5958 void netdev_update_features(struct net_device *dev)
5960 if (__netdev_update_features(dev))
5961 netdev_features_change(dev);
5963 EXPORT_SYMBOL(netdev_update_features);
5966 * netdev_change_features - recalculate device features
5967 * @dev: the device to check
5969 * Recalculate dev->features set and send notifications even
5970 * if they have not changed. Should be called instead of
5971 * netdev_update_features() if also dev->vlan_features might
5972 * have changed to allow the changes to be propagated to stacked
5975 void netdev_change_features(struct net_device *dev)
5977 __netdev_update_features(dev);
5978 netdev_features_change(dev);
5980 EXPORT_SYMBOL(netdev_change_features);
5983 * netif_stacked_transfer_operstate - transfer operstate
5984 * @rootdev: the root or lower level device to transfer state from
5985 * @dev: the device to transfer operstate to
5987 * Transfer operational state from root to device. This is normally
5988 * called when a stacking relationship exists between the root
5989 * device and the device(a leaf device).
5991 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5992 struct net_device *dev)
5994 if (rootdev->operstate == IF_OPER_DORMANT)
5995 netif_dormant_on(dev);
5997 netif_dormant_off(dev);
5999 if (netif_carrier_ok(rootdev)) {
6000 if (!netif_carrier_ok(dev))
6001 netif_carrier_on(dev);
6003 if (netif_carrier_ok(dev))
6004 netif_carrier_off(dev);
6007 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
6010 static int netif_alloc_rx_queues(struct net_device *dev)
6012 unsigned int i, count = dev->num_rx_queues;
6013 struct netdev_rx_queue *rx;
6017 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
6023 for (i = 0; i < count; i++)
6029 static void netdev_init_one_queue(struct net_device *dev,
6030 struct netdev_queue *queue, void *_unused)
6032 /* Initialize queue lock */
6033 spin_lock_init(&queue->_xmit_lock);
6034 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
6035 queue->xmit_lock_owner = -1;
6036 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
6039 dql_init(&queue->dql, HZ);
6043 static void netif_free_tx_queues(struct net_device *dev)
6048 static int netif_alloc_netdev_queues(struct net_device *dev)
6050 unsigned int count = dev->num_tx_queues;
6051 struct netdev_queue *tx;
6052 size_t sz = count * sizeof(*tx);
6054 BUG_ON(count < 1 || count > 0xffff);
6056 tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6064 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
6065 spin_lock_init(&dev->tx_global_lock);
6071 * register_netdevice - register a network device
6072 * @dev: device to register
6074 * Take a completed network device structure and add it to the kernel
6075 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6076 * chain. 0 is returned on success. A negative errno code is returned
6077 * on a failure to set up the device, or if the name is a duplicate.
6079 * Callers must hold the rtnl semaphore. You may want
6080 * register_netdev() instead of this.
6083 * The locking appears insufficient to guarantee two parallel registers
6084 * will not get the same name.
6087 int register_netdevice(struct net_device *dev)
6090 struct net *net = dev_net(dev);
6092 BUG_ON(dev_boot_phase);
6097 /* When net_device's are persistent, this will be fatal. */
6098 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
6101 spin_lock_init(&dev->addr_list_lock);
6102 netdev_set_addr_lockdep_class(dev);
6106 ret = dev_get_valid_name(net, dev, dev->name);
6110 /* Init, if this function is available */
6111 if (dev->netdev_ops->ndo_init) {
6112 ret = dev->netdev_ops->ndo_init(dev);
6120 if (((dev->hw_features | dev->features) &
6121 NETIF_F_HW_VLAN_CTAG_FILTER) &&
6122 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
6123 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
6124 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
6131 dev->ifindex = dev_new_index(net);
6132 else if (__dev_get_by_index(net, dev->ifindex))
6135 if (dev->iflink == -1)
6136 dev->iflink = dev->ifindex;
6138 /* Transfer changeable features to wanted_features and enable
6139 * software offloads (GSO and GRO).
6141 dev->hw_features |= NETIF_F_SOFT_FEATURES;
6142 dev->features |= NETIF_F_SOFT_FEATURES;
6143 dev->wanted_features = dev->features & dev->hw_features;
6145 if (!(dev->flags & IFF_LOOPBACK)) {
6146 dev->hw_features |= NETIF_F_NOCACHE_COPY;
6149 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6151 dev->vlan_features |= NETIF_F_HIGHDMA;
6153 /* Make NETIF_F_SG inheritable to tunnel devices.
6155 dev->hw_enc_features |= NETIF_F_SG;
6157 /* Make NETIF_F_SG inheritable to MPLS.
6159 dev->mpls_features |= NETIF_F_SG;
6161 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
6162 ret = notifier_to_errno(ret);
6166 ret = netdev_register_kobject(dev);
6169 dev->reg_state = NETREG_REGISTERED;
6171 __netdev_update_features(dev);
6174 * Default initial state at registry is that the
6175 * device is present.
6178 set_bit(__LINK_STATE_PRESENT, &dev->state);
6180 linkwatch_init_dev(dev);
6182 dev_init_scheduler(dev);
6184 list_netdevice(dev);
6185 add_device_randomness(dev->dev_addr, dev->addr_len);
6187 /* If the device has permanent device address, driver should
6188 * set dev_addr and also addr_assign_type should be set to
6189 * NET_ADDR_PERM (default value).
6191 if (dev->addr_assign_type == NET_ADDR_PERM)
6192 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
6194 /* Notify protocols, that a new device appeared. */
6195 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
6196 ret = notifier_to_errno(ret);
6198 rollback_registered(dev);
6199 dev->reg_state = NETREG_UNREGISTERED;
6202 * Prevent userspace races by waiting until the network
6203 * device is fully setup before sending notifications.
6205 if (!dev->rtnl_link_ops ||
6206 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6207 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
6213 if (dev->netdev_ops->ndo_uninit)
6214 dev->netdev_ops->ndo_uninit(dev);
6217 EXPORT_SYMBOL(register_netdevice);
6220 * init_dummy_netdev - init a dummy network device for NAPI
6221 * @dev: device to init
6223 * This takes a network device structure and initialize the minimum
6224 * amount of fields so it can be used to schedule NAPI polls without
6225 * registering a full blown interface. This is to be used by drivers
6226 * that need to tie several hardware interfaces to a single NAPI
6227 * poll scheduler due to HW limitations.
6229 int init_dummy_netdev(struct net_device *dev)
6231 /* Clear everything. Note we don't initialize spinlocks
6232 * are they aren't supposed to be taken by any of the
6233 * NAPI code and this dummy netdev is supposed to be
6234 * only ever used for NAPI polls
6236 memset(dev, 0, sizeof(struct net_device));
6238 /* make sure we BUG if trying to hit standard
6239 * register/unregister code path
6241 dev->reg_state = NETREG_DUMMY;
6243 /* NAPI wants this */
6244 INIT_LIST_HEAD(&dev->napi_list);
6246 /* a dummy interface is started by default */
6247 set_bit(__LINK_STATE_PRESENT, &dev->state);
6248 set_bit(__LINK_STATE_START, &dev->state);
6250 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6251 * because users of this 'device' dont need to change
6257 EXPORT_SYMBOL_GPL(init_dummy_netdev);
6261 * register_netdev - register a network device
6262 * @dev: device to register
6264 * Take a completed network device structure and add it to the kernel
6265 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6266 * chain. 0 is returned on success. A negative errno code is returned
6267 * on a failure to set up the device, or if the name is a duplicate.
6269 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6270 * and expands the device name if you passed a format string to
6273 int register_netdev(struct net_device *dev)
6278 err = register_netdevice(dev);
6282 EXPORT_SYMBOL(register_netdev);
6284 int netdev_refcnt_read(const struct net_device *dev)
6288 for_each_possible_cpu(i)
6289 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
6292 EXPORT_SYMBOL(netdev_refcnt_read);
6295 * netdev_wait_allrefs - wait until all references are gone.
6296 * @dev: target net_device
6298 * This is called when unregistering network devices.
6300 * Any protocol or device that holds a reference should register
6301 * for netdevice notification, and cleanup and put back the
6302 * reference if they receive an UNREGISTER event.
6303 * We can get stuck here if buggy protocols don't correctly
6306 static void netdev_wait_allrefs(struct net_device *dev)
6308 unsigned long rebroadcast_time, warning_time;
6311 linkwatch_forget_dev(dev);
6313 rebroadcast_time = warning_time = jiffies;
6314 refcnt = netdev_refcnt_read(dev);
6316 while (refcnt != 0) {
6317 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
6320 /* Rebroadcast unregister notification */
6321 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6327 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6328 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
6330 /* We must not have linkwatch events
6331 * pending on unregister. If this
6332 * happens, we simply run the queue
6333 * unscheduled, resulting in a noop
6336 linkwatch_run_queue();
6341 rebroadcast_time = jiffies;
6346 refcnt = netdev_refcnt_read(dev);
6348 if (time_after(jiffies, warning_time + 10 * HZ)) {
6349 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6351 warning_time = jiffies;
6360 * register_netdevice(x1);
6361 * register_netdevice(x2);
6363 * unregister_netdevice(y1);
6364 * unregister_netdevice(y2);
6370 * We are invoked by rtnl_unlock().
6371 * This allows us to deal with problems:
6372 * 1) We can delete sysfs objects which invoke hotplug
6373 * without deadlocking with linkwatch via keventd.
6374 * 2) Since we run with the RTNL semaphore not held, we can sleep
6375 * safely in order to wait for the netdev refcnt to drop to zero.
6377 * We must not return until all unregister events added during
6378 * the interval the lock was held have been completed.
6380 void netdev_run_todo(void)
6382 struct list_head list;
6384 /* Snapshot list, allow later requests */
6385 list_replace_init(&net_todo_list, &list);
6390 /* Wait for rcu callbacks to finish before next phase */
6391 if (!list_empty(&list))
6394 while (!list_empty(&list)) {
6395 struct net_device *dev
6396 = list_first_entry(&list, struct net_device, todo_list);
6397 list_del(&dev->todo_list);
6400 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6403 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
6404 pr_err("network todo '%s' but state %d\n",
6405 dev->name, dev->reg_state);
6410 dev->reg_state = NETREG_UNREGISTERED;
6412 on_each_cpu(flush_backlog, dev, 1);
6414 netdev_wait_allrefs(dev);
6417 BUG_ON(netdev_refcnt_read(dev));
6418 WARN_ON(rcu_access_pointer(dev->ip_ptr));
6419 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
6420 WARN_ON(dev->dn_ptr);
6422 if (dev->destructor)
6423 dev->destructor(dev);
6425 /* Report a network device has been unregistered */
6427 dev_net(dev)->dev_unreg_count--;
6429 wake_up(&netdev_unregistering_wq);
6431 /* Free network device */
6432 kobject_put(&dev->dev.kobj);
6436 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6437 * fields in the same order, with only the type differing.
6439 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
6440 const struct net_device_stats *netdev_stats)
6442 #if BITS_PER_LONG == 64
6443 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
6444 memcpy(stats64, netdev_stats, sizeof(*stats64));
6446 size_t i, n = sizeof(*stats64) / sizeof(u64);
6447 const unsigned long *src = (const unsigned long *)netdev_stats;
6448 u64 *dst = (u64 *)stats64;
6450 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
6451 sizeof(*stats64) / sizeof(u64));
6452 for (i = 0; i < n; i++)
6456 EXPORT_SYMBOL(netdev_stats_to_stats64);
6459 * dev_get_stats - get network device statistics
6460 * @dev: device to get statistics from
6461 * @storage: place to store stats
6463 * Get network statistics from device. Return @storage.
6464 * The device driver may provide its own method by setting
6465 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6466 * otherwise the internal statistics structure is used.
6468 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
6469 struct rtnl_link_stats64 *storage)
6471 const struct net_device_ops *ops = dev->netdev_ops;
6473 if (ops->ndo_get_stats64) {
6474 memset(storage, 0, sizeof(*storage));
6475 ops->ndo_get_stats64(dev, storage);
6476 } else if (ops->ndo_get_stats) {
6477 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
6479 netdev_stats_to_stats64(storage, &dev->stats);
6481 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
6482 storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
6485 EXPORT_SYMBOL(dev_get_stats);
6487 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
6489 struct netdev_queue *queue = dev_ingress_queue(dev);
6491 #ifdef CONFIG_NET_CLS_ACT
6494 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
6497 netdev_init_one_queue(dev, queue, NULL);
6498 queue->qdisc = &noop_qdisc;
6499 queue->qdisc_sleeping = &noop_qdisc;
6500 rcu_assign_pointer(dev->ingress_queue, queue);
6505 static const struct ethtool_ops default_ethtool_ops;
6507 void netdev_set_default_ethtool_ops(struct net_device *dev,
6508 const struct ethtool_ops *ops)
6510 if (dev->ethtool_ops == &default_ethtool_ops)
6511 dev->ethtool_ops = ops;
6513 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
6515 void netdev_freemem(struct net_device *dev)
6517 char *addr = (char *)dev - dev->padded;
6523 * alloc_netdev_mqs - allocate network device
6524 * @sizeof_priv: size of private data to allocate space for
6525 * @name: device name format string
6526 * @name_assign_type: origin of device name
6527 * @setup: callback to initialize device
6528 * @txqs: the number of TX subqueues to allocate
6529 * @rxqs: the number of RX subqueues to allocate
6531 * Allocates a struct net_device with private data area for driver use
6532 * and performs basic initialization. Also allocates subqueue structs
6533 * for each queue on the device.
6535 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
6536 unsigned char name_assign_type,
6537 void (*setup)(struct net_device *),
6538 unsigned int txqs, unsigned int rxqs)
6540 struct net_device *dev;
6542 struct net_device *p;
6544 BUG_ON(strlen(name) >= sizeof(dev->name));
6547 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6553 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6558 alloc_size = sizeof(struct net_device);
6560 /* ensure 32-byte alignment of private area */
6561 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6562 alloc_size += sizeof_priv;
6564 /* ensure 32-byte alignment of whole construct */
6565 alloc_size += NETDEV_ALIGN - 1;
6567 p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6569 p = vzalloc(alloc_size);
6573 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6574 dev->padded = (char *)dev - (char *)p;
6576 dev->pcpu_refcnt = alloc_percpu(int);
6577 if (!dev->pcpu_refcnt)
6580 if (dev_addr_init(dev))
6586 dev_net_set(dev, &init_net);
6588 dev->gso_max_size = GSO_MAX_SIZE;
6589 dev->gso_max_segs = GSO_MAX_SEGS;
6591 INIT_LIST_HEAD(&dev->napi_list);
6592 INIT_LIST_HEAD(&dev->unreg_list);
6593 INIT_LIST_HEAD(&dev->close_list);
6594 INIT_LIST_HEAD(&dev->link_watch_list);
6595 INIT_LIST_HEAD(&dev->adj_list.upper);
6596 INIT_LIST_HEAD(&dev->adj_list.lower);
6597 INIT_LIST_HEAD(&dev->all_adj_list.upper);
6598 INIT_LIST_HEAD(&dev->all_adj_list.lower);
6599 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6602 dev->num_tx_queues = txqs;
6603 dev->real_num_tx_queues = txqs;
6604 if (netif_alloc_netdev_queues(dev))
6608 dev->num_rx_queues = rxqs;
6609 dev->real_num_rx_queues = rxqs;
6610 if (netif_alloc_rx_queues(dev))
6614 strcpy(dev->name, name);
6615 dev->name_assign_type = name_assign_type;
6616 dev->group = INIT_NETDEV_GROUP;
6617 if (!dev->ethtool_ops)
6618 dev->ethtool_ops = &default_ethtool_ops;
6626 free_percpu(dev->pcpu_refcnt);
6628 netdev_freemem(dev);
6631 EXPORT_SYMBOL(alloc_netdev_mqs);
6634 * free_netdev - free network device
6637 * This function does the last stage of destroying an allocated device
6638 * interface. The reference to the device object is released.
6639 * If this is the last reference then it will be freed.
6641 void free_netdev(struct net_device *dev)
6643 struct napi_struct *p, *n;
6645 release_net(dev_net(dev));
6647 netif_free_tx_queues(dev);
6652 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6654 /* Flush device addresses */
6655 dev_addr_flush(dev);
6657 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6660 free_percpu(dev->pcpu_refcnt);
6661 dev->pcpu_refcnt = NULL;
6663 /* Compatibility with error handling in drivers */
6664 if (dev->reg_state == NETREG_UNINITIALIZED) {
6665 netdev_freemem(dev);
6669 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6670 dev->reg_state = NETREG_RELEASED;
6672 /* will free via device release */
6673 put_device(&dev->dev);
6675 EXPORT_SYMBOL(free_netdev);
6678 * synchronize_net - Synchronize with packet receive processing
6680 * Wait for packets currently being received to be done.
6681 * Does not block later packets from starting.
6683 void synchronize_net(void)
6686 if (rtnl_is_locked())
6687 synchronize_rcu_expedited();
6691 EXPORT_SYMBOL(synchronize_net);
6694 * unregister_netdevice_queue - remove device from the kernel
6698 * This function shuts down a device interface and removes it
6699 * from the kernel tables.
6700 * If head not NULL, device is queued to be unregistered later.
6702 * Callers must hold the rtnl semaphore. You may want
6703 * unregister_netdev() instead of this.
6706 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6711 list_move_tail(&dev->unreg_list, head);
6713 rollback_registered(dev);
6714 /* Finish processing unregister after unlock */
6718 EXPORT_SYMBOL(unregister_netdevice_queue);
6721 * unregister_netdevice_many - unregister many devices
6722 * @head: list of devices
6724 * Note: As most callers use a stack allocated list_head,
6725 * we force a list_del() to make sure stack wont be corrupted later.
6727 void unregister_netdevice_many(struct list_head *head)
6729 struct net_device *dev;
6731 if (!list_empty(head)) {
6732 rollback_registered_many(head);
6733 list_for_each_entry(dev, head, unreg_list)
6738 EXPORT_SYMBOL(unregister_netdevice_many);
6741 * unregister_netdev - remove device from the kernel
6744 * This function shuts down a device interface and removes it
6745 * from the kernel tables.
6747 * This is just a wrapper for unregister_netdevice that takes
6748 * the rtnl semaphore. In general you want to use this and not
6749 * unregister_netdevice.
6751 void unregister_netdev(struct net_device *dev)
6754 unregister_netdevice(dev);
6757 EXPORT_SYMBOL(unregister_netdev);
6760 * dev_change_net_namespace - move device to different nethost namespace
6762 * @net: network namespace
6763 * @pat: If not NULL name pattern to try if the current device name
6764 * is already taken in the destination network namespace.
6766 * This function shuts down a device interface and moves it
6767 * to a new network namespace. On success 0 is returned, on
6768 * a failure a netagive errno code is returned.
6770 * Callers must hold the rtnl semaphore.
6773 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6779 /* Don't allow namespace local devices to be moved. */
6781 if (dev->features & NETIF_F_NETNS_LOCAL)
6784 /* Ensure the device has been registrered */
6785 if (dev->reg_state != NETREG_REGISTERED)
6788 /* Get out if there is nothing todo */
6790 if (net_eq(dev_net(dev), net))
6793 /* Pick the destination device name, and ensure
6794 * we can use it in the destination network namespace.
6797 if (__dev_get_by_name(net, dev->name)) {
6798 /* We get here if we can't use the current device name */
6801 if (dev_get_valid_name(net, dev, pat) < 0)
6806 * And now a mini version of register_netdevice unregister_netdevice.
6809 /* If device is running close it first. */
6812 /* And unlink it from device chain */
6814 unlist_netdevice(dev);
6818 /* Shutdown queueing discipline. */
6821 /* Notify protocols, that we are about to destroy
6822 this device. They should clean all the things.
6824 Note that dev->reg_state stays at NETREG_REGISTERED.
6825 This is wanted because this way 8021q and macvlan know
6826 the device is just moving and can keep their slaves up.
6828 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6830 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6831 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
6834 * Flush the unicast and multicast chains
6839 /* Send a netdev-removed uevent to the old namespace */
6840 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
6842 /* Actually switch the network namespace */
6843 dev_net_set(dev, net);
6845 /* If there is an ifindex conflict assign a new one */
6846 if (__dev_get_by_index(net, dev->ifindex)) {
6847 int iflink = (dev->iflink == dev->ifindex);
6848 dev->ifindex = dev_new_index(net);
6850 dev->iflink = dev->ifindex;
6853 /* Send a netdev-add uevent to the new namespace */
6854 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
6856 /* Fixup kobjects */
6857 err = device_rename(&dev->dev, dev->name);
6860 /* Add the device back in the hashes */
6861 list_netdevice(dev);
6863 /* Notify protocols, that a new device appeared. */
6864 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6867 * Prevent userspace races by waiting until the network
6868 * device is fully setup before sending notifications.
6870 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
6877 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6879 static int dev_cpu_callback(struct notifier_block *nfb,
6880 unsigned long action,
6883 struct sk_buff **list_skb;
6884 struct sk_buff *skb;
6885 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6886 struct softnet_data *sd, *oldsd;
6888 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6891 local_irq_disable();
6892 cpu = smp_processor_id();
6893 sd = &per_cpu(softnet_data, cpu);
6894 oldsd = &per_cpu(softnet_data, oldcpu);
6896 /* Find end of our completion_queue. */
6897 list_skb = &sd->completion_queue;
6899 list_skb = &(*list_skb)->next;
6900 /* Append completion queue from offline CPU. */
6901 *list_skb = oldsd->completion_queue;
6902 oldsd->completion_queue = NULL;
6904 /* Append output queue from offline CPU. */
6905 if (oldsd->output_queue) {
6906 *sd->output_queue_tailp = oldsd->output_queue;
6907 sd->output_queue_tailp = oldsd->output_queue_tailp;
6908 oldsd->output_queue = NULL;
6909 oldsd->output_queue_tailp = &oldsd->output_queue;
6911 /* Append NAPI poll list from offline CPU. */
6912 if (!list_empty(&oldsd->poll_list)) {
6913 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6914 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6917 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6920 /* Process offline CPU's input_pkt_queue */
6921 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6922 netif_rx_internal(skb);
6923 input_queue_head_incr(oldsd);
6925 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6926 netif_rx_internal(skb);
6927 input_queue_head_incr(oldsd);
6935 * netdev_increment_features - increment feature set by one
6936 * @all: current feature set
6937 * @one: new feature set
6938 * @mask: mask feature set
6940 * Computes a new feature set after adding a device with feature set
6941 * @one to the master device with current feature set @all. Will not
6942 * enable anything that is off in @mask. Returns the new feature set.
6944 netdev_features_t netdev_increment_features(netdev_features_t all,
6945 netdev_features_t one, netdev_features_t mask)
6947 if (mask & NETIF_F_GEN_CSUM)
6948 mask |= NETIF_F_ALL_CSUM;
6949 mask |= NETIF_F_VLAN_CHALLENGED;
6951 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6952 all &= one | ~NETIF_F_ALL_FOR_ALL;
6954 /* If one device supports hw checksumming, set for all. */
6955 if (all & NETIF_F_GEN_CSUM)
6956 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6960 EXPORT_SYMBOL(netdev_increment_features);
6962 static struct hlist_head * __net_init netdev_create_hash(void)
6965 struct hlist_head *hash;
6967 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6969 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6970 INIT_HLIST_HEAD(&hash[i]);
6975 /* Initialize per network namespace state */
6976 static int __net_init netdev_init(struct net *net)
6978 if (net != &init_net)
6979 INIT_LIST_HEAD(&net->dev_base_head);
6981 net->dev_name_head = netdev_create_hash();
6982 if (net->dev_name_head == NULL)
6985 net->dev_index_head = netdev_create_hash();
6986 if (net->dev_index_head == NULL)
6992 kfree(net->dev_name_head);
6998 * netdev_drivername - network driver for the device
6999 * @dev: network device
7001 * Determine network driver for device.
7003 const char *netdev_drivername(const struct net_device *dev)
7005 const struct device_driver *driver;
7006 const struct device *parent;
7007 const char *empty = "";
7009 parent = dev->dev.parent;
7013 driver = parent->driver;
7014 if (driver && driver->name)
7015 return driver->name;
7019 static int __netdev_printk(const char *level, const struct net_device *dev,
7020 struct va_format *vaf)
7024 if (dev && dev->dev.parent) {
7025 r = dev_printk_emit(level[1] - '0',
7028 dev_driver_string(dev->dev.parent),
7029 dev_name(dev->dev.parent),
7030 netdev_name(dev), netdev_reg_state(dev),
7033 r = printk("%s%s%s: %pV", level, netdev_name(dev),
7034 netdev_reg_state(dev), vaf);
7036 r = printk("%s(NULL net_device): %pV", level, vaf);
7042 int netdev_printk(const char *level, const struct net_device *dev,
7043 const char *format, ...)
7045 struct va_format vaf;
7049 va_start(args, format);
7054 r = __netdev_printk(level, dev, &vaf);
7060 EXPORT_SYMBOL(netdev_printk);
7062 #define define_netdev_printk_level(func, level) \
7063 int func(const struct net_device *dev, const char *fmt, ...) \
7066 struct va_format vaf; \
7069 va_start(args, fmt); \
7074 r = __netdev_printk(level, dev, &vaf); \
7080 EXPORT_SYMBOL(func);
7082 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
7083 define_netdev_printk_level(netdev_alert, KERN_ALERT);
7084 define_netdev_printk_level(netdev_crit, KERN_CRIT);
7085 define_netdev_printk_level(netdev_err, KERN_ERR);
7086 define_netdev_printk_level(netdev_warn, KERN_WARNING);
7087 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
7088 define_netdev_printk_level(netdev_info, KERN_INFO);
7090 static void __net_exit netdev_exit(struct net *net)
7092 kfree(net->dev_name_head);
7093 kfree(net->dev_index_head);
7096 static struct pernet_operations __net_initdata netdev_net_ops = {
7097 .init = netdev_init,
7098 .exit = netdev_exit,
7101 static void __net_exit default_device_exit(struct net *net)
7103 struct net_device *dev, *aux;
7105 * Push all migratable network devices back to the
7106 * initial network namespace
7109 for_each_netdev_safe(net, dev, aux) {
7111 char fb_name[IFNAMSIZ];
7113 /* Ignore unmoveable devices (i.e. loopback) */
7114 if (dev->features & NETIF_F_NETNS_LOCAL)
7117 /* Leave virtual devices for the generic cleanup */
7118 if (dev->rtnl_link_ops)
7121 /* Push remaining network devices to init_net */
7122 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
7123 err = dev_change_net_namespace(dev, &init_net, fb_name);
7125 pr_emerg("%s: failed to move %s to init_net: %d\n",
7126 __func__, dev->name, err);
7133 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
7135 /* Return with the rtnl_lock held when there are no network
7136 * devices unregistering in any network namespace in net_list.
7143 prepare_to_wait(&netdev_unregistering_wq, &wait,
7144 TASK_UNINTERRUPTIBLE);
7145 unregistering = false;
7147 list_for_each_entry(net, net_list, exit_list) {
7148 if (net->dev_unreg_count > 0) {
7149 unregistering = true;
7158 finish_wait(&netdev_unregistering_wq, &wait);
7161 static void __net_exit default_device_exit_batch(struct list_head *net_list)
7163 /* At exit all network devices most be removed from a network
7164 * namespace. Do this in the reverse order of registration.
7165 * Do this across as many network namespaces as possible to
7166 * improve batching efficiency.
7168 struct net_device *dev;
7170 LIST_HEAD(dev_kill_list);
7172 /* To prevent network device cleanup code from dereferencing
7173 * loopback devices or network devices that have been freed
7174 * wait here for all pending unregistrations to complete,
7175 * before unregistring the loopback device and allowing the
7176 * network namespace be freed.
7178 * The netdev todo list containing all network devices
7179 * unregistrations that happen in default_device_exit_batch
7180 * will run in the rtnl_unlock() at the end of
7181 * default_device_exit_batch.
7183 rtnl_lock_unregistering(net_list);
7184 list_for_each_entry(net, net_list, exit_list) {
7185 for_each_netdev_reverse(net, dev) {
7186 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
7187 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
7189 unregister_netdevice_queue(dev, &dev_kill_list);
7192 unregister_netdevice_many(&dev_kill_list);
7196 static struct pernet_operations __net_initdata default_device_ops = {
7197 .exit = default_device_exit,
7198 .exit_batch = default_device_exit_batch,
7202 * Initialize the DEV module. At boot time this walks the device list and
7203 * unhooks any devices that fail to initialise (normally hardware not
7204 * present) and leaves us with a valid list of present and active devices.
7209 * This is called single threaded during boot, so no need
7210 * to take the rtnl semaphore.
7212 static int __init net_dev_init(void)
7214 int i, rc = -ENOMEM;
7216 BUG_ON(!dev_boot_phase);
7218 if (dev_proc_init())
7221 if (netdev_kobject_init())
7224 INIT_LIST_HEAD(&ptype_all);
7225 for (i = 0; i < PTYPE_HASH_SIZE; i++)
7226 INIT_LIST_HEAD(&ptype_base[i]);
7228 INIT_LIST_HEAD(&offload_base);
7230 if (register_pernet_subsys(&netdev_net_ops))
7234 * Initialise the packet receive queues.
7237 for_each_possible_cpu(i) {
7238 struct softnet_data *sd = &per_cpu(softnet_data, i);
7240 skb_queue_head_init(&sd->input_pkt_queue);
7241 skb_queue_head_init(&sd->process_queue);
7242 INIT_LIST_HEAD(&sd->poll_list);
7243 sd->output_queue_tailp = &sd->output_queue;
7245 sd->csd.func = rps_trigger_softirq;
7250 sd->backlog.poll = process_backlog;
7251 sd->backlog.weight = weight_p;
7256 /* The loopback device is special if any other network devices
7257 * is present in a network namespace the loopback device must
7258 * be present. Since we now dynamically allocate and free the
7259 * loopback device ensure this invariant is maintained by
7260 * keeping the loopback device as the first device on the
7261 * list of network devices. Ensuring the loopback devices
7262 * is the first device that appears and the last network device
7265 if (register_pernet_device(&loopback_net_ops))
7268 if (register_pernet_device(&default_device_ops))
7271 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
7272 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
7274 hotcpu_notifier(dev_cpu_callback, 0);
7281 subsys_initcall(net_dev_init);