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/dst_metadata.h>
103 #include <net/pkt_sched.h>
104 #include <net/checksum.h>
105 #include <net/xfrm.h>
106 #include <linux/highmem.h>
107 #include <linux/init.h>
108 #include <linux/module.h>
109 #include <linux/netpoll.h>
110 #include <linux/rcupdate.h>
111 #include <linux/delay.h>
112 #include <net/iw_handler.h>
113 #include <asm/current.h>
114 #include <linux/audit.h>
115 #include <linux/dmaengine.h>
116 #include <linux/err.h>
117 #include <linux/ctype.h>
118 #include <linux/if_arp.h>
119 #include <linux/if_vlan.h>
120 #include <linux/ip.h>
122 #include <net/mpls.h>
123 #include <linux/ipv6.h>
124 #include <linux/in.h>
125 #include <linux/jhash.h>
126 #include <linux/random.h>
127 #include <trace/events/napi.h>
128 #include <trace/events/net.h>
129 #include <trace/events/skb.h>
130 #include <linux/pci.h>
131 #include <linux/inetdevice.h>
132 #include <linux/cpu_rmap.h>
133 #include <linux/static_key.h>
134 #include <linux/hashtable.h>
135 #include <linux/vmalloc.h>
136 #include <linux/if_macvlan.h>
137 #include <linux/errqueue.h>
138 #include <linux/hrtimer.h>
139 #include <linux/netfilter_ingress.h>
141 #include "net-sysfs.h"
143 /* Instead of increasing this, you should create a hash table. */
144 #define MAX_GRO_SKBS 8
146 /* This should be increased if a protocol with a bigger head is added. */
147 #define GRO_MAX_HEAD (MAX_HEADER + 128)
149 static DEFINE_SPINLOCK(ptype_lock);
150 static DEFINE_SPINLOCK(offload_lock);
151 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
152 struct list_head ptype_all __read_mostly; /* Taps */
153 static struct list_head offload_base __read_mostly;
155 static int netif_rx_internal(struct sk_buff *skb);
156 static int call_netdevice_notifiers_info(unsigned long val,
157 struct net_device *dev,
158 struct netdev_notifier_info *info);
161 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
164 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
166 * Writers must hold the rtnl semaphore while they loop through the
167 * dev_base_head list, and hold dev_base_lock for writing when they do the
168 * actual updates. This allows pure readers to access the list even
169 * while a writer is preparing to update it.
171 * To put it another way, dev_base_lock is held for writing only to
172 * protect against pure readers; the rtnl semaphore provides the
173 * protection against other writers.
175 * See, for example usages, register_netdevice() and
176 * unregister_netdevice(), which must be called with the rtnl
179 DEFINE_RWLOCK(dev_base_lock);
180 EXPORT_SYMBOL(dev_base_lock);
182 /* protects napi_hash addition/deletion and napi_gen_id */
183 static DEFINE_SPINLOCK(napi_hash_lock);
185 static unsigned int napi_gen_id;
186 static DEFINE_HASHTABLE(napi_hash, 8);
188 static seqcount_t devnet_rename_seq;
190 static inline void dev_base_seq_inc(struct net *net)
192 while (++net->dev_base_seq == 0);
195 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
197 unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
199 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
202 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
204 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
207 static inline void rps_lock(struct softnet_data *sd)
210 spin_lock(&sd->input_pkt_queue.lock);
214 static inline void rps_unlock(struct softnet_data *sd)
217 spin_unlock(&sd->input_pkt_queue.lock);
221 /* Device list insertion */
222 static void list_netdevice(struct net_device *dev)
224 struct net *net = dev_net(dev);
228 write_lock_bh(&dev_base_lock);
229 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
230 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
231 hlist_add_head_rcu(&dev->index_hlist,
232 dev_index_hash(net, dev->ifindex));
233 write_unlock_bh(&dev_base_lock);
235 dev_base_seq_inc(net);
238 /* Device list removal
239 * caller must respect a RCU grace period before freeing/reusing dev
241 static void unlist_netdevice(struct net_device *dev)
245 /* Unlink dev from the device chain */
246 write_lock_bh(&dev_base_lock);
247 list_del_rcu(&dev->dev_list);
248 hlist_del_rcu(&dev->name_hlist);
249 hlist_del_rcu(&dev->index_hlist);
250 write_unlock_bh(&dev_base_lock);
252 dev_base_seq_inc(dev_net(dev));
259 static RAW_NOTIFIER_HEAD(netdev_chain);
262 * Device drivers call our routines to queue packets here. We empty the
263 * queue in the local softnet handler.
266 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
267 EXPORT_PER_CPU_SYMBOL(softnet_data);
269 #ifdef CONFIG_LOCKDEP
271 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
272 * according to dev->type
274 static const unsigned short netdev_lock_type[] =
275 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
276 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
277 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
278 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
279 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
280 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
281 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
282 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
283 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
284 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
285 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
286 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
287 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
288 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
289 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
291 static const char *const netdev_lock_name[] =
292 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
293 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
294 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
295 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
296 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
297 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
298 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
299 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
300 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
301 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
302 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
303 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
304 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
305 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
306 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
308 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
309 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
311 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
315 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
316 if (netdev_lock_type[i] == dev_type)
318 /* the last key is used by default */
319 return ARRAY_SIZE(netdev_lock_type) - 1;
322 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
323 unsigned short dev_type)
327 i = netdev_lock_pos(dev_type);
328 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
329 netdev_lock_name[i]);
332 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
336 i = netdev_lock_pos(dev->type);
337 lockdep_set_class_and_name(&dev->addr_list_lock,
338 &netdev_addr_lock_key[i],
339 netdev_lock_name[i]);
342 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
343 unsigned short dev_type)
346 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
351 /*******************************************************************************
353 Protocol management and registration routines
355 *******************************************************************************/
358 * Add a protocol ID to the list. Now that the input handler is
359 * smarter we can dispense with all the messy stuff that used to be
362 * BEWARE!!! Protocol handlers, mangling input packets,
363 * MUST BE last in hash buckets and checking protocol handlers
364 * MUST start from promiscuous ptype_all chain in net_bh.
365 * It is true now, do not change it.
366 * Explanation follows: if protocol handler, mangling packet, will
367 * be the first on list, it is not able to sense, that packet
368 * is cloned and should be copied-on-write, so that it will
369 * change it and subsequent readers will get broken packet.
373 static inline struct list_head *ptype_head(const struct packet_type *pt)
375 if (pt->type == htons(ETH_P_ALL))
376 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
378 return pt->dev ? &pt->dev->ptype_specific :
379 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
383 * dev_add_pack - add packet handler
384 * @pt: packet type declaration
386 * Add a protocol handler to the networking stack. The passed &packet_type
387 * is linked into kernel lists and may not be freed until it has been
388 * removed from the kernel lists.
390 * This call does not sleep therefore it can not
391 * guarantee all CPU's that are in middle of receiving packets
392 * will see the new packet type (until the next received packet).
395 void dev_add_pack(struct packet_type *pt)
397 struct list_head *head = ptype_head(pt);
399 spin_lock(&ptype_lock);
400 list_add_rcu(&pt->list, head);
401 spin_unlock(&ptype_lock);
403 EXPORT_SYMBOL(dev_add_pack);
406 * __dev_remove_pack - remove packet handler
407 * @pt: packet type declaration
409 * Remove a protocol handler that was previously added to the kernel
410 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
411 * from the kernel lists and can be freed or reused once this function
414 * The packet type might still be in use by receivers
415 * and must not be freed until after all the CPU's have gone
416 * through a quiescent state.
418 void __dev_remove_pack(struct packet_type *pt)
420 struct list_head *head = ptype_head(pt);
421 struct packet_type *pt1;
423 spin_lock(&ptype_lock);
425 list_for_each_entry(pt1, head, list) {
427 list_del_rcu(&pt->list);
432 pr_warn("dev_remove_pack: %p not found\n", pt);
434 spin_unlock(&ptype_lock);
436 EXPORT_SYMBOL(__dev_remove_pack);
439 * dev_remove_pack - remove packet handler
440 * @pt: packet type declaration
442 * Remove a protocol handler that was previously added to the kernel
443 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
444 * from the kernel lists and can be freed or reused once this function
447 * This call sleeps to guarantee that no CPU is looking at the packet
450 void dev_remove_pack(struct packet_type *pt)
452 __dev_remove_pack(pt);
456 EXPORT_SYMBOL(dev_remove_pack);
460 * dev_add_offload - register offload handlers
461 * @po: protocol offload declaration
463 * Add protocol offload handlers to the networking stack. The passed
464 * &proto_offload is linked into kernel lists and may not be freed until
465 * it has been removed from the kernel lists.
467 * This call does not sleep therefore it can not
468 * guarantee all CPU's that are in middle of receiving packets
469 * will see the new offload handlers (until the next received packet).
471 void dev_add_offload(struct packet_offload *po)
473 struct packet_offload *elem;
475 spin_lock(&offload_lock);
476 list_for_each_entry(elem, &offload_base, list) {
477 if (po->priority < elem->priority)
480 list_add_rcu(&po->list, elem->list.prev);
481 spin_unlock(&offload_lock);
483 EXPORT_SYMBOL(dev_add_offload);
486 * __dev_remove_offload - remove offload handler
487 * @po: packet offload declaration
489 * Remove a protocol offload handler that was previously added to the
490 * kernel offload handlers by dev_add_offload(). The passed &offload_type
491 * is removed from the kernel lists and can be freed or reused once this
494 * The packet type might still be in use by receivers
495 * and must not be freed until after all the CPU's have gone
496 * through a quiescent state.
498 static void __dev_remove_offload(struct packet_offload *po)
500 struct list_head *head = &offload_base;
501 struct packet_offload *po1;
503 spin_lock(&offload_lock);
505 list_for_each_entry(po1, head, list) {
507 list_del_rcu(&po->list);
512 pr_warn("dev_remove_offload: %p not found\n", po);
514 spin_unlock(&offload_lock);
518 * dev_remove_offload - remove packet offload handler
519 * @po: packet offload declaration
521 * Remove a packet offload handler that was previously added to the kernel
522 * offload handlers by dev_add_offload(). The passed &offload_type is
523 * removed from the kernel lists and can be freed or reused once this
526 * This call sleeps to guarantee that no CPU is looking at the packet
529 void dev_remove_offload(struct packet_offload *po)
531 __dev_remove_offload(po);
535 EXPORT_SYMBOL(dev_remove_offload);
537 /******************************************************************************
539 Device Boot-time Settings Routines
541 *******************************************************************************/
543 /* Boot time configuration table */
544 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
547 * netdev_boot_setup_add - add new setup entry
548 * @name: name of the device
549 * @map: configured settings for the device
551 * Adds new setup entry to the dev_boot_setup list. The function
552 * returns 0 on error and 1 on success. This is a generic routine to
555 static int netdev_boot_setup_add(char *name, struct ifmap *map)
557 struct netdev_boot_setup *s;
561 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
562 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
563 memset(s[i].name, 0, sizeof(s[i].name));
564 strlcpy(s[i].name, name, IFNAMSIZ);
565 memcpy(&s[i].map, map, sizeof(s[i].map));
570 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
574 * netdev_boot_setup_check - check boot time settings
575 * @dev: the netdevice
577 * Check boot time settings for the device.
578 * The found settings are set for the device to be used
579 * later in the device probing.
580 * Returns 0 if no settings found, 1 if they are.
582 int netdev_boot_setup_check(struct net_device *dev)
584 struct netdev_boot_setup *s = dev_boot_setup;
587 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
588 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
589 !strcmp(dev->name, s[i].name)) {
590 dev->irq = s[i].map.irq;
591 dev->base_addr = s[i].map.base_addr;
592 dev->mem_start = s[i].map.mem_start;
593 dev->mem_end = s[i].map.mem_end;
599 EXPORT_SYMBOL(netdev_boot_setup_check);
603 * netdev_boot_base - get address from boot time settings
604 * @prefix: prefix for network device
605 * @unit: id for network device
607 * Check boot time settings for the base address of device.
608 * The found settings are set for the device to be used
609 * later in the device probing.
610 * Returns 0 if no settings found.
612 unsigned long netdev_boot_base(const char *prefix, int unit)
614 const struct netdev_boot_setup *s = dev_boot_setup;
618 sprintf(name, "%s%d", prefix, unit);
621 * If device already registered then return base of 1
622 * to indicate not to probe for this interface
624 if (__dev_get_by_name(&init_net, name))
627 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
628 if (!strcmp(name, s[i].name))
629 return s[i].map.base_addr;
634 * Saves at boot time configured settings for any netdevice.
636 int __init netdev_boot_setup(char *str)
641 str = get_options(str, ARRAY_SIZE(ints), ints);
646 memset(&map, 0, sizeof(map));
650 map.base_addr = ints[2];
652 map.mem_start = ints[3];
654 map.mem_end = ints[4];
656 /* Add new entry to the list */
657 return netdev_boot_setup_add(str, &map);
660 __setup("netdev=", netdev_boot_setup);
662 /*******************************************************************************
664 Device Interface Subroutines
666 *******************************************************************************/
669 * dev_get_iflink - get 'iflink' value of a interface
670 * @dev: targeted interface
672 * Indicates the ifindex the interface is linked to.
673 * Physical interfaces have the same 'ifindex' and 'iflink' values.
676 int dev_get_iflink(const struct net_device *dev)
678 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
679 return dev->netdev_ops->ndo_get_iflink(dev);
683 EXPORT_SYMBOL(dev_get_iflink);
686 * dev_fill_metadata_dst - Retrieve tunnel egress information.
687 * @dev: targeted interface
690 * For better visibility of tunnel traffic OVS needs to retrieve
691 * egress tunnel information for a packet. Following API allows
692 * user to get this info.
694 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
696 struct ip_tunnel_info *info;
698 if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst)
701 info = skb_tunnel_info_unclone(skb);
704 if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
707 return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
709 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
712 * __dev_get_by_name - find a device by its name
713 * @net: the applicable net namespace
714 * @name: name to find
716 * Find an interface by name. Must be called under RTNL semaphore
717 * or @dev_base_lock. If the name is found a pointer to the device
718 * is returned. If the name is not found then %NULL is returned. The
719 * reference counters are not incremented so the caller must be
720 * careful with locks.
723 struct net_device *__dev_get_by_name(struct net *net, const char *name)
725 struct net_device *dev;
726 struct hlist_head *head = dev_name_hash(net, name);
728 hlist_for_each_entry(dev, head, name_hlist)
729 if (!strncmp(dev->name, name, IFNAMSIZ))
734 EXPORT_SYMBOL(__dev_get_by_name);
737 * dev_get_by_name_rcu - find a device by its name
738 * @net: the applicable net namespace
739 * @name: name to find
741 * Find an interface by name.
742 * If the name is found a pointer to the device is returned.
743 * If the name is not found then %NULL is returned.
744 * The reference counters are not incremented so the caller must be
745 * careful with locks. The caller must hold RCU lock.
748 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
750 struct net_device *dev;
751 struct hlist_head *head = dev_name_hash(net, name);
753 hlist_for_each_entry_rcu(dev, head, name_hlist)
754 if (!strncmp(dev->name, name, IFNAMSIZ))
759 EXPORT_SYMBOL(dev_get_by_name_rcu);
762 * dev_get_by_name - find a device by its name
763 * @net: the applicable net namespace
764 * @name: name to find
766 * Find an interface by name. This can be called from any
767 * context and does its own locking. The returned handle has
768 * the usage count incremented and the caller must use dev_put() to
769 * release it when it is no longer needed. %NULL is returned if no
770 * matching device is found.
773 struct net_device *dev_get_by_name(struct net *net, const char *name)
775 struct net_device *dev;
778 dev = dev_get_by_name_rcu(net, name);
784 EXPORT_SYMBOL(dev_get_by_name);
787 * __dev_get_by_index - find a device by its ifindex
788 * @net: the applicable net namespace
789 * @ifindex: index of device
791 * Search for an interface by index. Returns %NULL if the device
792 * is not found or a pointer to the device. The device has not
793 * had its reference counter increased so the caller must be careful
794 * about locking. The caller must hold either the RTNL semaphore
798 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
800 struct net_device *dev;
801 struct hlist_head *head = dev_index_hash(net, ifindex);
803 hlist_for_each_entry(dev, head, index_hlist)
804 if (dev->ifindex == ifindex)
809 EXPORT_SYMBOL(__dev_get_by_index);
812 * dev_get_by_index_rcu - find a device by its ifindex
813 * @net: the applicable net namespace
814 * @ifindex: index of device
816 * Search for an interface by index. Returns %NULL if the device
817 * is not found or a pointer to the device. The device has not
818 * had its reference counter increased so the caller must be careful
819 * about locking. The caller must hold RCU lock.
822 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
824 struct net_device *dev;
825 struct hlist_head *head = dev_index_hash(net, ifindex);
827 hlist_for_each_entry_rcu(dev, head, index_hlist)
828 if (dev->ifindex == ifindex)
833 EXPORT_SYMBOL(dev_get_by_index_rcu);
837 * dev_get_by_index - find a device by its ifindex
838 * @net: the applicable net namespace
839 * @ifindex: index of device
841 * Search for an interface by index. Returns NULL if the device
842 * is not found or a pointer to the device. The device returned has
843 * had a reference added and the pointer is safe until the user calls
844 * dev_put to indicate they have finished with it.
847 struct net_device *dev_get_by_index(struct net *net, int ifindex)
849 struct net_device *dev;
852 dev = dev_get_by_index_rcu(net, ifindex);
858 EXPORT_SYMBOL(dev_get_by_index);
861 * netdev_get_name - get a netdevice name, knowing its ifindex.
862 * @net: network namespace
863 * @name: a pointer to the buffer where the name will be stored.
864 * @ifindex: the ifindex of the interface to get the name from.
866 * The use of raw_seqcount_begin() and cond_resched() before
867 * retrying is required as we want to give the writers a chance
868 * to complete when CONFIG_PREEMPT is not set.
870 int netdev_get_name(struct net *net, char *name, int ifindex)
872 struct net_device *dev;
876 seq = raw_seqcount_begin(&devnet_rename_seq);
878 dev = dev_get_by_index_rcu(net, ifindex);
884 strcpy(name, dev->name);
886 if (read_seqcount_retry(&devnet_rename_seq, seq)) {
895 * dev_getbyhwaddr_rcu - find a device by its hardware address
896 * @net: the applicable net namespace
897 * @type: media type of device
898 * @ha: hardware address
900 * Search for an interface by MAC address. Returns NULL if the device
901 * is not found or a pointer to the device.
902 * The caller must hold RCU or RTNL.
903 * The returned device has not had its ref count increased
904 * and the caller must therefore be careful about locking
908 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
911 struct net_device *dev;
913 for_each_netdev_rcu(net, dev)
914 if (dev->type == type &&
915 !memcmp(dev->dev_addr, ha, dev->addr_len))
920 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
922 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
924 struct net_device *dev;
927 for_each_netdev(net, dev)
928 if (dev->type == type)
933 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
935 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
937 struct net_device *dev, *ret = NULL;
940 for_each_netdev_rcu(net, dev)
941 if (dev->type == type) {
949 EXPORT_SYMBOL(dev_getfirstbyhwtype);
952 * __dev_get_by_flags - find any device with given flags
953 * @net: the applicable net namespace
954 * @if_flags: IFF_* values
955 * @mask: bitmask of bits in if_flags to check
957 * Search for any interface with the given flags. Returns NULL if a device
958 * is not found or a pointer to the device. Must be called inside
959 * rtnl_lock(), and result refcount is unchanged.
962 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
965 struct net_device *dev, *ret;
970 for_each_netdev(net, dev) {
971 if (((dev->flags ^ if_flags) & mask) == 0) {
978 EXPORT_SYMBOL(__dev_get_by_flags);
981 * dev_valid_name - check if name is okay for network device
984 * Network device names need to be valid file names to
985 * to allow sysfs to work. We also disallow any kind of
988 bool dev_valid_name(const char *name)
992 if (strlen(name) >= IFNAMSIZ)
994 if (!strcmp(name, ".") || !strcmp(name, ".."))
998 if (*name == '/' || *name == ':' || isspace(*name))
1004 EXPORT_SYMBOL(dev_valid_name);
1007 * __dev_alloc_name - allocate a name for a device
1008 * @net: network namespace to allocate the device name in
1009 * @name: name format string
1010 * @buf: scratch buffer and result name string
1012 * Passed a format string - eg "lt%d" it will try and find a suitable
1013 * id. It scans list of devices to build up a free map, then chooses
1014 * the first empty slot. The caller must hold the dev_base or rtnl lock
1015 * while allocating the name and adding the device in order to avoid
1017 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1018 * Returns the number of the unit assigned or a negative errno code.
1021 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
1025 const int max_netdevices = 8*PAGE_SIZE;
1026 unsigned long *inuse;
1027 struct net_device *d;
1029 p = strnchr(name, IFNAMSIZ-1, '%');
1032 * Verify the string as this thing may have come from
1033 * the user. There must be either one "%d" and no other "%"
1036 if (p[1] != 'd' || strchr(p + 2, '%'))
1039 /* Use one page as a bit array of possible slots */
1040 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
1044 for_each_netdev(net, d) {
1045 if (!sscanf(d->name, name, &i))
1047 if (i < 0 || i >= max_netdevices)
1050 /* avoid cases where sscanf is not exact inverse of printf */
1051 snprintf(buf, IFNAMSIZ, name, i);
1052 if (!strncmp(buf, d->name, IFNAMSIZ))
1056 i = find_first_zero_bit(inuse, max_netdevices);
1057 free_page((unsigned long) inuse);
1061 snprintf(buf, IFNAMSIZ, name, i);
1062 if (!__dev_get_by_name(net, buf))
1065 /* It is possible to run out of possible slots
1066 * when the name is long and there isn't enough space left
1067 * for the digits, or if all bits are used.
1073 * dev_alloc_name - allocate a name for a device
1075 * @name: name format string
1077 * Passed a format string - eg "lt%d" it will try and find a suitable
1078 * id. It scans list of devices to build up a free map, then chooses
1079 * the first empty slot. The caller must hold the dev_base or rtnl lock
1080 * while allocating the name and adding the device in order to avoid
1082 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1083 * Returns the number of the unit assigned or a negative errno code.
1086 int dev_alloc_name(struct net_device *dev, const char *name)
1092 BUG_ON(!dev_net(dev));
1094 ret = __dev_alloc_name(net, name, buf);
1096 strlcpy(dev->name, buf, IFNAMSIZ);
1099 EXPORT_SYMBOL(dev_alloc_name);
1101 static int dev_alloc_name_ns(struct net *net,
1102 struct net_device *dev,
1108 ret = __dev_alloc_name(net, name, buf);
1110 strlcpy(dev->name, buf, IFNAMSIZ);
1114 static int dev_get_valid_name(struct net *net,
1115 struct net_device *dev,
1120 if (!dev_valid_name(name))
1123 if (strchr(name, '%'))
1124 return dev_alloc_name_ns(net, dev, name);
1125 else if (__dev_get_by_name(net, name))
1127 else if (dev->name != name)
1128 strlcpy(dev->name, name, IFNAMSIZ);
1134 * dev_change_name - change name of a device
1136 * @newname: name (or format string) must be at least IFNAMSIZ
1138 * Change name of a device, can pass format strings "eth%d".
1141 int dev_change_name(struct net_device *dev, const char *newname)
1143 unsigned char old_assign_type;
1144 char oldname[IFNAMSIZ];
1150 BUG_ON(!dev_net(dev));
1153 if (dev->flags & IFF_UP)
1156 write_seqcount_begin(&devnet_rename_seq);
1158 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1159 write_seqcount_end(&devnet_rename_seq);
1163 memcpy(oldname, dev->name, IFNAMSIZ);
1165 err = dev_get_valid_name(net, dev, newname);
1167 write_seqcount_end(&devnet_rename_seq);
1171 if (oldname[0] && !strchr(oldname, '%'))
1172 netdev_info(dev, "renamed from %s\n", oldname);
1174 old_assign_type = dev->name_assign_type;
1175 dev->name_assign_type = NET_NAME_RENAMED;
1178 ret = device_rename(&dev->dev, dev->name);
1180 memcpy(dev->name, oldname, IFNAMSIZ);
1181 dev->name_assign_type = old_assign_type;
1182 write_seqcount_end(&devnet_rename_seq);
1186 write_seqcount_end(&devnet_rename_seq);
1188 netdev_adjacent_rename_links(dev, oldname);
1190 write_lock_bh(&dev_base_lock);
1191 hlist_del_rcu(&dev->name_hlist);
1192 write_unlock_bh(&dev_base_lock);
1196 write_lock_bh(&dev_base_lock);
1197 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1198 write_unlock_bh(&dev_base_lock);
1200 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1201 ret = notifier_to_errno(ret);
1204 /* err >= 0 after dev_alloc_name() or stores the first errno */
1207 write_seqcount_begin(&devnet_rename_seq);
1208 memcpy(dev->name, oldname, IFNAMSIZ);
1209 memcpy(oldname, newname, IFNAMSIZ);
1210 dev->name_assign_type = old_assign_type;
1211 old_assign_type = NET_NAME_RENAMED;
1214 pr_err("%s: name change rollback failed: %d\n",
1223 * dev_set_alias - change ifalias of a device
1225 * @alias: name up to IFALIASZ
1226 * @len: limit of bytes to copy from info
1228 * Set ifalias for a device,
1230 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1236 if (len >= IFALIASZ)
1240 kfree(dev->ifalias);
1241 dev->ifalias = NULL;
1245 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1248 dev->ifalias = new_ifalias;
1250 strlcpy(dev->ifalias, alias, len+1);
1256 * netdev_features_change - device changes features
1257 * @dev: device to cause notification
1259 * Called to indicate a device has changed features.
1261 void netdev_features_change(struct net_device *dev)
1263 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1265 EXPORT_SYMBOL(netdev_features_change);
1268 * netdev_state_change - device changes state
1269 * @dev: device to cause notification
1271 * Called to indicate a device has changed state. This function calls
1272 * the notifier chains for netdev_chain and sends a NEWLINK message
1273 * to the routing socket.
1275 void netdev_state_change(struct net_device *dev)
1277 if (dev->flags & IFF_UP) {
1278 struct netdev_notifier_change_info change_info;
1280 change_info.flags_changed = 0;
1281 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
1283 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1286 EXPORT_SYMBOL(netdev_state_change);
1289 * netdev_notify_peers - notify network peers about existence of @dev
1290 * @dev: network device
1292 * Generate traffic such that interested network peers are aware of
1293 * @dev, such as by generating a gratuitous ARP. This may be used when
1294 * a device wants to inform the rest of the network about some sort of
1295 * reconfiguration such as a failover event or virtual machine
1298 void netdev_notify_peers(struct net_device *dev)
1301 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1304 EXPORT_SYMBOL(netdev_notify_peers);
1306 static int __dev_open(struct net_device *dev)
1308 const struct net_device_ops *ops = dev->netdev_ops;
1313 if (!netif_device_present(dev))
1316 /* Block netpoll from trying to do any rx path servicing.
1317 * If we don't do this there is a chance ndo_poll_controller
1318 * or ndo_poll may be running while we open the device
1320 netpoll_poll_disable(dev);
1322 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1323 ret = notifier_to_errno(ret);
1327 set_bit(__LINK_STATE_START, &dev->state);
1329 if (ops->ndo_validate_addr)
1330 ret = ops->ndo_validate_addr(dev);
1332 if (!ret && ops->ndo_open)
1333 ret = ops->ndo_open(dev);
1335 netpoll_poll_enable(dev);
1338 clear_bit(__LINK_STATE_START, &dev->state);
1340 dev->flags |= IFF_UP;
1341 dev_set_rx_mode(dev);
1343 add_device_randomness(dev->dev_addr, dev->addr_len);
1350 * dev_open - prepare an interface for use.
1351 * @dev: device to open
1353 * Takes a device from down to up state. The device's private open
1354 * function is invoked and then the multicast lists are loaded. Finally
1355 * the device is moved into the up state and a %NETDEV_UP message is
1356 * sent to the netdev notifier chain.
1358 * Calling this function on an active interface is a nop. On a failure
1359 * a negative errno code is returned.
1361 int dev_open(struct net_device *dev)
1365 if (dev->flags & IFF_UP)
1368 ret = __dev_open(dev);
1372 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1373 call_netdevice_notifiers(NETDEV_UP, dev);
1377 EXPORT_SYMBOL(dev_open);
1379 static int __dev_close_many(struct list_head *head)
1381 struct net_device *dev;
1386 list_for_each_entry(dev, head, close_list) {
1387 /* Temporarily disable netpoll until the interface is down */
1388 netpoll_poll_disable(dev);
1390 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1392 clear_bit(__LINK_STATE_START, &dev->state);
1394 /* Synchronize to scheduled poll. We cannot touch poll list, it
1395 * can be even on different cpu. So just clear netif_running().
1397 * dev->stop() will invoke napi_disable() on all of it's
1398 * napi_struct instances on this device.
1400 smp_mb__after_atomic(); /* Commit netif_running(). */
1403 dev_deactivate_many(head);
1405 list_for_each_entry(dev, head, close_list) {
1406 const struct net_device_ops *ops = dev->netdev_ops;
1409 * Call the device specific close. This cannot fail.
1410 * Only if device is UP
1412 * We allow it to be called even after a DETACH hot-plug
1418 dev->flags &= ~IFF_UP;
1419 netpoll_poll_enable(dev);
1425 static int __dev_close(struct net_device *dev)
1430 list_add(&dev->close_list, &single);
1431 retval = __dev_close_many(&single);
1437 int dev_close_many(struct list_head *head, bool unlink)
1439 struct net_device *dev, *tmp;
1441 /* Remove the devices that don't need to be closed */
1442 list_for_each_entry_safe(dev, tmp, head, close_list)
1443 if (!(dev->flags & IFF_UP))
1444 list_del_init(&dev->close_list);
1446 __dev_close_many(head);
1448 list_for_each_entry_safe(dev, tmp, head, close_list) {
1449 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1450 call_netdevice_notifiers(NETDEV_DOWN, dev);
1452 list_del_init(&dev->close_list);
1457 EXPORT_SYMBOL(dev_close_many);
1460 * dev_close - shutdown an interface.
1461 * @dev: device to shutdown
1463 * This function moves an active device into down state. A
1464 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1465 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1468 int dev_close(struct net_device *dev)
1470 if (dev->flags & IFF_UP) {
1473 list_add(&dev->close_list, &single);
1474 dev_close_many(&single, true);
1479 EXPORT_SYMBOL(dev_close);
1483 * dev_disable_lro - disable Large Receive Offload on a device
1486 * Disable Large Receive Offload (LRO) on a net device. Must be
1487 * called under RTNL. This is needed if received packets may be
1488 * forwarded to another interface.
1490 void dev_disable_lro(struct net_device *dev)
1492 struct net_device *lower_dev;
1493 struct list_head *iter;
1495 dev->wanted_features &= ~NETIF_F_LRO;
1496 netdev_update_features(dev);
1498 if (unlikely(dev->features & NETIF_F_LRO))
1499 netdev_WARN(dev, "failed to disable LRO!\n");
1501 netdev_for_each_lower_dev(dev, lower_dev, iter)
1502 dev_disable_lro(lower_dev);
1504 EXPORT_SYMBOL(dev_disable_lro);
1506 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1507 struct net_device *dev)
1509 struct netdev_notifier_info info;
1511 netdev_notifier_info_init(&info, dev);
1512 return nb->notifier_call(nb, val, &info);
1515 static int dev_boot_phase = 1;
1518 * register_netdevice_notifier - register a network notifier block
1521 * Register a notifier to be called when network device events occur.
1522 * The notifier passed is linked into the kernel structures and must
1523 * not be reused until it has been unregistered. A negative errno code
1524 * is returned on a failure.
1526 * When registered all registration and up events are replayed
1527 * to the new notifier to allow device to have a race free
1528 * view of the network device list.
1531 int register_netdevice_notifier(struct notifier_block *nb)
1533 struct net_device *dev;
1534 struct net_device *last;
1539 err = raw_notifier_chain_register(&netdev_chain, nb);
1545 for_each_netdev(net, dev) {
1546 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1547 err = notifier_to_errno(err);
1551 if (!(dev->flags & IFF_UP))
1554 call_netdevice_notifier(nb, NETDEV_UP, dev);
1565 for_each_netdev(net, dev) {
1569 if (dev->flags & IFF_UP) {
1570 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1572 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1574 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1579 raw_notifier_chain_unregister(&netdev_chain, nb);
1582 EXPORT_SYMBOL(register_netdevice_notifier);
1585 * unregister_netdevice_notifier - unregister a network notifier block
1588 * Unregister a notifier previously registered by
1589 * register_netdevice_notifier(). The notifier is unlinked into the
1590 * kernel structures and may then be reused. A negative errno code
1591 * is returned on a failure.
1593 * After unregistering unregister and down device events are synthesized
1594 * for all devices on the device list to the removed notifier to remove
1595 * the need for special case cleanup code.
1598 int unregister_netdevice_notifier(struct notifier_block *nb)
1600 struct net_device *dev;
1605 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1610 for_each_netdev(net, dev) {
1611 if (dev->flags & IFF_UP) {
1612 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1614 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1616 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1623 EXPORT_SYMBOL(unregister_netdevice_notifier);
1626 * call_netdevice_notifiers_info - call all network notifier blocks
1627 * @val: value passed unmodified to notifier function
1628 * @dev: net_device pointer passed unmodified to notifier function
1629 * @info: notifier information data
1631 * Call all network notifier blocks. Parameters and return value
1632 * are as for raw_notifier_call_chain().
1635 static int call_netdevice_notifiers_info(unsigned long val,
1636 struct net_device *dev,
1637 struct netdev_notifier_info *info)
1640 netdev_notifier_info_init(info, dev);
1641 return raw_notifier_call_chain(&netdev_chain, val, info);
1645 * call_netdevice_notifiers - call all network notifier blocks
1646 * @val: value passed unmodified to notifier function
1647 * @dev: net_device pointer passed unmodified to notifier function
1649 * Call all network notifier blocks. Parameters and return value
1650 * are as for raw_notifier_call_chain().
1653 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1655 struct netdev_notifier_info info;
1657 return call_netdevice_notifiers_info(val, dev, &info);
1659 EXPORT_SYMBOL(call_netdevice_notifiers);
1661 #ifdef CONFIG_NET_INGRESS
1662 static struct static_key ingress_needed __read_mostly;
1664 void net_inc_ingress_queue(void)
1666 static_key_slow_inc(&ingress_needed);
1668 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
1670 void net_dec_ingress_queue(void)
1672 static_key_slow_dec(&ingress_needed);
1674 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
1677 static struct static_key netstamp_needed __read_mostly;
1678 #ifdef HAVE_JUMP_LABEL
1679 /* We are not allowed to call static_key_slow_dec() from irq context
1680 * If net_disable_timestamp() is called from irq context, defer the
1681 * static_key_slow_dec() calls.
1683 static atomic_t netstamp_needed_deferred;
1686 void net_enable_timestamp(void)
1688 #ifdef HAVE_JUMP_LABEL
1689 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1693 static_key_slow_dec(&netstamp_needed);
1697 static_key_slow_inc(&netstamp_needed);
1699 EXPORT_SYMBOL(net_enable_timestamp);
1701 void net_disable_timestamp(void)
1703 #ifdef HAVE_JUMP_LABEL
1704 if (in_interrupt()) {
1705 atomic_inc(&netstamp_needed_deferred);
1709 static_key_slow_dec(&netstamp_needed);
1711 EXPORT_SYMBOL(net_disable_timestamp);
1713 static inline void net_timestamp_set(struct sk_buff *skb)
1715 skb->tstamp.tv64 = 0;
1716 if (static_key_false(&netstamp_needed))
1717 __net_timestamp(skb);
1720 #define net_timestamp_check(COND, SKB) \
1721 if (static_key_false(&netstamp_needed)) { \
1722 if ((COND) && !(SKB)->tstamp.tv64) \
1723 __net_timestamp(SKB); \
1726 bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb)
1730 if (!(dev->flags & IFF_UP))
1733 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1734 if (skb->len <= len)
1737 /* if TSO is enabled, we don't care about the length as the packet
1738 * could be forwarded without being segmented before
1740 if (skb_is_gso(skb))
1745 EXPORT_SYMBOL_GPL(is_skb_forwardable);
1747 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1749 if (skb_orphan_frags(skb, GFP_ATOMIC) ||
1750 unlikely(!is_skb_forwardable(dev, skb))) {
1751 atomic_long_inc(&dev->rx_dropped);
1756 skb_scrub_packet(skb, true);
1758 skb->protocol = eth_type_trans(skb, dev);
1759 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1763 EXPORT_SYMBOL_GPL(__dev_forward_skb);
1766 * dev_forward_skb - loopback an skb to another netif
1768 * @dev: destination network device
1769 * @skb: buffer to forward
1772 * NET_RX_SUCCESS (no congestion)
1773 * NET_RX_DROP (packet was dropped, but freed)
1775 * dev_forward_skb can be used for injecting an skb from the
1776 * start_xmit function of one device into the receive queue
1777 * of another device.
1779 * The receiving device may be in another namespace, so
1780 * we have to clear all information in the skb that could
1781 * impact namespace isolation.
1783 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1785 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
1787 EXPORT_SYMBOL_GPL(dev_forward_skb);
1789 static inline int deliver_skb(struct sk_buff *skb,
1790 struct packet_type *pt_prev,
1791 struct net_device *orig_dev)
1793 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1795 atomic_inc(&skb->users);
1796 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1799 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
1800 struct packet_type **pt,
1801 struct net_device *orig_dev,
1803 struct list_head *ptype_list)
1805 struct packet_type *ptype, *pt_prev = *pt;
1807 list_for_each_entry_rcu(ptype, ptype_list, list) {
1808 if (ptype->type != type)
1811 deliver_skb(skb, pt_prev, orig_dev);
1817 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1819 if (!ptype->af_packet_priv || !skb->sk)
1822 if (ptype->id_match)
1823 return ptype->id_match(ptype, skb->sk);
1824 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1831 * Support routine. Sends outgoing frames to any network
1832 * taps currently in use.
1835 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1837 struct packet_type *ptype;
1838 struct sk_buff *skb2 = NULL;
1839 struct packet_type *pt_prev = NULL;
1840 struct list_head *ptype_list = &ptype_all;
1844 list_for_each_entry_rcu(ptype, ptype_list, list) {
1845 /* Never send packets back to the socket
1846 * they originated from - MvS (miquels@drinkel.ow.org)
1848 if (skb_loop_sk(ptype, skb))
1852 deliver_skb(skb2, pt_prev, skb->dev);
1857 /* need to clone skb, done only once */
1858 skb2 = skb_clone(skb, GFP_ATOMIC);
1862 net_timestamp_set(skb2);
1864 /* skb->nh should be correctly
1865 * set by sender, so that the second statement is
1866 * just protection against buggy protocols.
1868 skb_reset_mac_header(skb2);
1870 if (skb_network_header(skb2) < skb2->data ||
1871 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
1872 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1873 ntohs(skb2->protocol),
1875 skb_reset_network_header(skb2);
1878 skb2->transport_header = skb2->network_header;
1879 skb2->pkt_type = PACKET_OUTGOING;
1883 if (ptype_list == &ptype_all) {
1884 ptype_list = &dev->ptype_all;
1889 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1894 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1895 * @dev: Network device
1896 * @txq: number of queues available
1898 * If real_num_tx_queues is changed the tc mappings may no longer be
1899 * valid. To resolve this verify the tc mapping remains valid and if
1900 * not NULL the mapping. With no priorities mapping to this
1901 * offset/count pair it will no longer be used. In the worst case TC0
1902 * is invalid nothing can be done so disable priority mappings. If is
1903 * expected that drivers will fix this mapping if they can before
1904 * calling netif_set_real_num_tx_queues.
1906 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1909 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1911 /* If TC0 is invalidated disable TC mapping */
1912 if (tc->offset + tc->count > txq) {
1913 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1918 /* Invalidated prio to tc mappings set to TC0 */
1919 for (i = 1; i < TC_BITMASK + 1; i++) {
1920 int q = netdev_get_prio_tc_map(dev, i);
1922 tc = &dev->tc_to_txq[q];
1923 if (tc->offset + tc->count > txq) {
1924 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1926 netdev_set_prio_tc_map(dev, i, 0);
1932 static DEFINE_MUTEX(xps_map_mutex);
1933 #define xmap_dereference(P) \
1934 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1936 static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
1939 struct xps_map *map = NULL;
1943 map = xmap_dereference(dev_maps->cpu_map[cpu]);
1945 for (pos = 0; map && pos < map->len; pos++) {
1946 if (map->queues[pos] == index) {
1948 map->queues[pos] = map->queues[--map->len];
1950 RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL);
1951 kfree_rcu(map, rcu);
1961 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
1963 struct xps_dev_maps *dev_maps;
1965 bool active = false;
1967 mutex_lock(&xps_map_mutex);
1968 dev_maps = xmap_dereference(dev->xps_maps);
1973 for_each_possible_cpu(cpu) {
1974 for (i = index; i < dev->num_tx_queues; i++) {
1975 if (!remove_xps_queue(dev_maps, cpu, i))
1978 if (i == dev->num_tx_queues)
1983 RCU_INIT_POINTER(dev->xps_maps, NULL);
1984 kfree_rcu(dev_maps, rcu);
1987 for (i = index; i < dev->num_tx_queues; i++)
1988 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
1992 mutex_unlock(&xps_map_mutex);
1995 static struct xps_map *expand_xps_map(struct xps_map *map,
1998 struct xps_map *new_map;
1999 int alloc_len = XPS_MIN_MAP_ALLOC;
2002 for (pos = 0; map && pos < map->len; pos++) {
2003 if (map->queues[pos] != index)
2008 /* Need to add queue to this CPU's existing map */
2010 if (pos < map->alloc_len)
2013 alloc_len = map->alloc_len * 2;
2016 /* Need to allocate new map to store queue on this CPU's map */
2017 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
2022 for (i = 0; i < pos; i++)
2023 new_map->queues[i] = map->queues[i];
2024 new_map->alloc_len = alloc_len;
2030 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2033 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
2034 struct xps_map *map, *new_map;
2035 int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES);
2036 int cpu, numa_node_id = -2;
2037 bool active = false;
2039 mutex_lock(&xps_map_mutex);
2041 dev_maps = xmap_dereference(dev->xps_maps);
2043 /* allocate memory for queue storage */
2044 for_each_online_cpu(cpu) {
2045 if (!cpumask_test_cpu(cpu, mask))
2049 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2050 if (!new_dev_maps) {
2051 mutex_unlock(&xps_map_mutex);
2055 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2058 map = expand_xps_map(map, cpu, index);
2062 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2066 goto out_no_new_maps;
2068 for_each_possible_cpu(cpu) {
2069 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
2070 /* add queue to CPU maps */
2073 map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2074 while ((pos < map->len) && (map->queues[pos] != index))
2077 if (pos == map->len)
2078 map->queues[map->len++] = index;
2080 if (numa_node_id == -2)
2081 numa_node_id = cpu_to_node(cpu);
2082 else if (numa_node_id != cpu_to_node(cpu))
2085 } else if (dev_maps) {
2086 /* fill in the new device map from the old device map */
2087 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2088 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2093 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
2095 /* Cleanup old maps */
2097 for_each_possible_cpu(cpu) {
2098 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2099 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2100 if (map && map != new_map)
2101 kfree_rcu(map, rcu);
2104 kfree_rcu(dev_maps, rcu);
2107 dev_maps = new_dev_maps;
2111 /* update Tx queue numa node */
2112 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2113 (numa_node_id >= 0) ? numa_node_id :
2119 /* removes queue from unused CPUs */
2120 for_each_possible_cpu(cpu) {
2121 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu))
2124 if (remove_xps_queue(dev_maps, cpu, index))
2128 /* free map if not active */
2130 RCU_INIT_POINTER(dev->xps_maps, NULL);
2131 kfree_rcu(dev_maps, rcu);
2135 mutex_unlock(&xps_map_mutex);
2139 /* remove any maps that we added */
2140 for_each_possible_cpu(cpu) {
2141 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2142 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2144 if (new_map && new_map != map)
2148 mutex_unlock(&xps_map_mutex);
2150 kfree(new_dev_maps);
2153 EXPORT_SYMBOL(netif_set_xps_queue);
2157 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2158 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2160 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2164 if (txq < 1 || txq > dev->num_tx_queues)
2167 if (dev->reg_state == NETREG_REGISTERED ||
2168 dev->reg_state == NETREG_UNREGISTERING) {
2171 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2177 netif_setup_tc(dev, txq);
2179 if (txq < dev->real_num_tx_queues) {
2180 qdisc_reset_all_tx_gt(dev, txq);
2182 netif_reset_xps_queues_gt(dev, txq);
2187 dev->real_num_tx_queues = txq;
2190 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2194 * netif_set_real_num_rx_queues - set actual number of RX queues used
2195 * @dev: Network device
2196 * @rxq: Actual number of RX queues
2198 * This must be called either with the rtnl_lock held or before
2199 * registration of the net device. Returns 0 on success, or a
2200 * negative error code. If called before registration, it always
2203 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2207 if (rxq < 1 || rxq > dev->num_rx_queues)
2210 if (dev->reg_state == NETREG_REGISTERED) {
2213 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2219 dev->real_num_rx_queues = rxq;
2222 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2226 * netif_get_num_default_rss_queues - default number of RSS queues
2228 * This routine should set an upper limit on the number of RSS queues
2229 * used by default by multiqueue devices.
2231 int netif_get_num_default_rss_queues(void)
2233 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
2235 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
2237 static inline void __netif_reschedule(struct Qdisc *q)
2239 struct softnet_data *sd;
2240 unsigned long flags;
2242 local_irq_save(flags);
2243 sd = this_cpu_ptr(&softnet_data);
2244 q->next_sched = NULL;
2245 *sd->output_queue_tailp = q;
2246 sd->output_queue_tailp = &q->next_sched;
2247 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2248 local_irq_restore(flags);
2251 void __netif_schedule(struct Qdisc *q)
2253 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
2254 __netif_reschedule(q);
2256 EXPORT_SYMBOL(__netif_schedule);
2258 struct dev_kfree_skb_cb {
2259 enum skb_free_reason reason;
2262 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
2264 return (struct dev_kfree_skb_cb *)skb->cb;
2267 void netif_schedule_queue(struct netdev_queue *txq)
2270 if (!(txq->state & QUEUE_STATE_ANY_XOFF)) {
2271 struct Qdisc *q = rcu_dereference(txq->qdisc);
2273 __netif_schedule(q);
2277 EXPORT_SYMBOL(netif_schedule_queue);
2280 * netif_wake_subqueue - allow sending packets on subqueue
2281 * @dev: network device
2282 * @queue_index: sub queue index
2284 * Resume individual transmit queue of a device with multiple transmit queues.
2286 void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2288 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2290 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state)) {
2294 q = rcu_dereference(txq->qdisc);
2295 __netif_schedule(q);
2299 EXPORT_SYMBOL(netif_wake_subqueue);
2301 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
2303 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
2307 q = rcu_dereference(dev_queue->qdisc);
2308 __netif_schedule(q);
2312 EXPORT_SYMBOL(netif_tx_wake_queue);
2314 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
2316 unsigned long flags;
2318 if (likely(atomic_read(&skb->users) == 1)) {
2320 atomic_set(&skb->users, 0);
2321 } else if (likely(!atomic_dec_and_test(&skb->users))) {
2324 get_kfree_skb_cb(skb)->reason = reason;
2325 local_irq_save(flags);
2326 skb->next = __this_cpu_read(softnet_data.completion_queue);
2327 __this_cpu_write(softnet_data.completion_queue, skb);
2328 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2329 local_irq_restore(flags);
2331 EXPORT_SYMBOL(__dev_kfree_skb_irq);
2333 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
2335 if (in_irq() || irqs_disabled())
2336 __dev_kfree_skb_irq(skb, reason);
2340 EXPORT_SYMBOL(__dev_kfree_skb_any);
2344 * netif_device_detach - mark device as removed
2345 * @dev: network device
2347 * Mark device as removed from system and therefore no longer available.
2349 void netif_device_detach(struct net_device *dev)
2351 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
2352 netif_running(dev)) {
2353 netif_tx_stop_all_queues(dev);
2356 EXPORT_SYMBOL(netif_device_detach);
2359 * netif_device_attach - mark device as attached
2360 * @dev: network device
2362 * Mark device as attached from system and restart if needed.
2364 void netif_device_attach(struct net_device *dev)
2366 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2367 netif_running(dev)) {
2368 netif_tx_wake_all_queues(dev);
2369 __netdev_watchdog_up(dev);
2372 EXPORT_SYMBOL(netif_device_attach);
2375 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2376 * to be used as a distribution range.
2378 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
2379 unsigned int num_tx_queues)
2383 u16 qcount = num_tx_queues;
2385 if (skb_rx_queue_recorded(skb)) {
2386 hash = skb_get_rx_queue(skb);
2387 while (unlikely(hash >= num_tx_queues))
2388 hash -= num_tx_queues;
2393 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2394 qoffset = dev->tc_to_txq[tc].offset;
2395 qcount = dev->tc_to_txq[tc].count;
2398 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
2400 EXPORT_SYMBOL(__skb_tx_hash);
2402 static void skb_warn_bad_offload(const struct sk_buff *skb)
2404 static const netdev_features_t null_features = 0;
2405 struct net_device *dev = skb->dev;
2406 const char *name = "";
2408 if (!net_ratelimit())
2412 if (dev->dev.parent)
2413 name = dev_driver_string(dev->dev.parent);
2415 name = netdev_name(dev);
2417 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2418 "gso_type=%d ip_summed=%d\n",
2419 name, dev ? &dev->features : &null_features,
2420 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2421 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2422 skb_shinfo(skb)->gso_type, skb->ip_summed);
2426 * Invalidate hardware checksum when packet is to be mangled, and
2427 * complete checksum manually on outgoing path.
2429 int skb_checksum_help(struct sk_buff *skb)
2432 int ret = 0, offset;
2434 if (skb->ip_summed == CHECKSUM_COMPLETE)
2435 goto out_set_summed;
2437 if (unlikely(skb_shinfo(skb)->gso_size)) {
2438 skb_warn_bad_offload(skb);
2442 /* Before computing a checksum, we should make sure no frag could
2443 * be modified by an external entity : checksum could be wrong.
2445 if (skb_has_shared_frag(skb)) {
2446 ret = __skb_linearize(skb);
2451 offset = skb_checksum_start_offset(skb);
2452 BUG_ON(offset >= skb_headlen(skb));
2453 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2455 offset += skb->csum_offset;
2456 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2458 if (skb_cloned(skb) &&
2459 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2460 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2465 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
2467 skb->ip_summed = CHECKSUM_NONE;
2471 EXPORT_SYMBOL(skb_checksum_help);
2473 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
2475 __be16 type = skb->protocol;
2477 /* Tunnel gso handlers can set protocol to ethernet. */
2478 if (type == htons(ETH_P_TEB)) {
2481 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
2484 eth = (struct ethhdr *)skb_mac_header(skb);
2485 type = eth->h_proto;
2488 return __vlan_get_protocol(skb, type, depth);
2492 * skb_mac_gso_segment - mac layer segmentation handler.
2493 * @skb: buffer to segment
2494 * @features: features for the output path (see dev->features)
2496 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
2497 netdev_features_t features)
2499 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
2500 struct packet_offload *ptype;
2501 int vlan_depth = skb->mac_len;
2502 __be16 type = skb_network_protocol(skb, &vlan_depth);
2504 if (unlikely(!type))
2505 return ERR_PTR(-EINVAL);
2507 __skb_pull(skb, vlan_depth);
2510 list_for_each_entry_rcu(ptype, &offload_base, list) {
2511 if (ptype->type == type && ptype->callbacks.gso_segment) {
2512 segs = ptype->callbacks.gso_segment(skb, features);
2518 __skb_push(skb, skb->data - skb_mac_header(skb));
2522 EXPORT_SYMBOL(skb_mac_gso_segment);
2525 /* openvswitch calls this on rx path, so we need a different check.
2527 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
2530 return skb->ip_summed != CHECKSUM_PARTIAL;
2532 return skb->ip_summed == CHECKSUM_NONE;
2536 * __skb_gso_segment - Perform segmentation on skb.
2537 * @skb: buffer to segment
2538 * @features: features for the output path (see dev->features)
2539 * @tx_path: whether it is called in TX path
2541 * This function segments the given skb and returns a list of segments.
2543 * It may return NULL if the skb requires no segmentation. This is
2544 * only possible when GSO is used for verifying header integrity.
2546 * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
2548 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
2549 netdev_features_t features, bool tx_path)
2551 if (unlikely(skb_needs_check(skb, tx_path))) {
2554 skb_warn_bad_offload(skb);
2556 err = skb_cow_head(skb, 0);
2558 return ERR_PTR(err);
2561 BUILD_BUG_ON(SKB_SGO_CB_OFFSET +
2562 sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
2564 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
2565 SKB_GSO_CB(skb)->encap_level = 0;
2567 skb_reset_mac_header(skb);
2568 skb_reset_mac_len(skb);
2570 return skb_mac_gso_segment(skb, features);
2572 EXPORT_SYMBOL(__skb_gso_segment);
2574 /* Take action when hardware reception checksum errors are detected. */
2576 void netdev_rx_csum_fault(struct net_device *dev)
2578 if (net_ratelimit()) {
2579 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2583 EXPORT_SYMBOL(netdev_rx_csum_fault);
2586 /* Actually, we should eliminate this check as soon as we know, that:
2587 * 1. IOMMU is present and allows to map all the memory.
2588 * 2. No high memory really exists on this machine.
2591 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2593 #ifdef CONFIG_HIGHMEM
2595 if (!(dev->features & NETIF_F_HIGHDMA)) {
2596 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2597 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2598 if (PageHighMem(skb_frag_page(frag)))
2603 if (PCI_DMA_BUS_IS_PHYS) {
2604 struct device *pdev = dev->dev.parent;
2608 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2609 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2610 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2611 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2619 /* If MPLS offload request, verify we are testing hardware MPLS features
2620 * instead of standard features for the netdev.
2622 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2623 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2624 netdev_features_t features,
2627 if (eth_p_mpls(type))
2628 features &= skb->dev->mpls_features;
2633 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2634 netdev_features_t features,
2641 static netdev_features_t harmonize_features(struct sk_buff *skb,
2642 netdev_features_t features)
2647 type = skb_network_protocol(skb, &tmp);
2648 features = net_mpls_features(skb, features, type);
2650 if (skb->ip_summed != CHECKSUM_NONE &&
2651 !can_checksum_protocol(features, type)) {
2652 features &= ~NETIF_F_ALL_CSUM;
2653 } else if (illegal_highdma(skb->dev, skb)) {
2654 features &= ~NETIF_F_SG;
2660 netdev_features_t passthru_features_check(struct sk_buff *skb,
2661 struct net_device *dev,
2662 netdev_features_t features)
2666 EXPORT_SYMBOL(passthru_features_check);
2668 static netdev_features_t dflt_features_check(const struct sk_buff *skb,
2669 struct net_device *dev,
2670 netdev_features_t features)
2672 return vlan_features_check(skb, features);
2675 netdev_features_t netif_skb_features(struct sk_buff *skb)
2677 struct net_device *dev = skb->dev;
2678 netdev_features_t features = dev->features;
2679 u16 gso_segs = skb_shinfo(skb)->gso_segs;
2681 if (gso_segs > dev->gso_max_segs || gso_segs < dev->gso_min_segs)
2682 features &= ~NETIF_F_GSO_MASK;
2684 /* If encapsulation offload request, verify we are testing
2685 * hardware encapsulation features instead of standard
2686 * features for the netdev
2688 if (skb->encapsulation)
2689 features &= dev->hw_enc_features;
2691 if (skb_vlan_tagged(skb))
2692 features = netdev_intersect_features(features,
2693 dev->vlan_features |
2694 NETIF_F_HW_VLAN_CTAG_TX |
2695 NETIF_F_HW_VLAN_STAG_TX);
2697 if (dev->netdev_ops->ndo_features_check)
2698 features &= dev->netdev_ops->ndo_features_check(skb, dev,
2701 features &= dflt_features_check(skb, dev, features);
2703 return harmonize_features(skb, features);
2705 EXPORT_SYMBOL(netif_skb_features);
2707 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
2708 struct netdev_queue *txq, bool more)
2713 if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
2714 dev_queue_xmit_nit(skb, dev);
2717 trace_net_dev_start_xmit(skb, dev);
2718 rc = netdev_start_xmit(skb, dev, txq, more);
2719 trace_net_dev_xmit(skb, rc, dev, len);
2724 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
2725 struct netdev_queue *txq, int *ret)
2727 struct sk_buff *skb = first;
2728 int rc = NETDEV_TX_OK;
2731 struct sk_buff *next = skb->next;
2734 rc = xmit_one(skb, dev, txq, next != NULL);
2735 if (unlikely(!dev_xmit_complete(rc))) {
2741 if (netif_xmit_stopped(txq) && skb) {
2742 rc = NETDEV_TX_BUSY;
2752 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
2753 netdev_features_t features)
2755 if (skb_vlan_tag_present(skb) &&
2756 !vlan_hw_offload_capable(features, skb->vlan_proto))
2757 skb = __vlan_hwaccel_push_inside(skb);
2761 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
2763 netdev_features_t features;
2768 features = netif_skb_features(skb);
2769 skb = validate_xmit_vlan(skb, features);
2773 if (netif_needs_gso(skb, features)) {
2774 struct sk_buff *segs;
2776 segs = skb_gso_segment(skb, features);
2784 if (skb_needs_linearize(skb, features) &&
2785 __skb_linearize(skb))
2788 /* If packet is not checksummed and device does not
2789 * support checksumming for this protocol, complete
2790 * checksumming here.
2792 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2793 if (skb->encapsulation)
2794 skb_set_inner_transport_header(skb,
2795 skb_checksum_start_offset(skb));
2797 skb_set_transport_header(skb,
2798 skb_checksum_start_offset(skb));
2799 if (!(features & NETIF_F_ALL_CSUM) &&
2800 skb_checksum_help(skb))
2813 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev)
2815 struct sk_buff *next, *head = NULL, *tail;
2817 for (; skb != NULL; skb = next) {
2821 /* in case skb wont be segmented, point to itself */
2824 skb = validate_xmit_skb(skb, dev);
2832 /* If skb was segmented, skb->prev points to
2833 * the last segment. If not, it still contains skb.
2839 EXPORT_SYMBOL_GPL(validate_xmit_skb_list);
2841 static void qdisc_pkt_len_init(struct sk_buff *skb)
2843 const struct skb_shared_info *shinfo = skb_shinfo(skb);
2845 qdisc_skb_cb(skb)->pkt_len = skb->len;
2847 /* To get more precise estimation of bytes sent on wire,
2848 * we add to pkt_len the headers size of all segments
2850 if (shinfo->gso_size) {
2851 unsigned int hdr_len;
2852 u16 gso_segs = shinfo->gso_segs;
2854 /* mac layer + network layer */
2855 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
2857 /* + transport layer */
2858 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
2859 hdr_len += tcp_hdrlen(skb);
2861 hdr_len += sizeof(struct udphdr);
2863 if (shinfo->gso_type & SKB_GSO_DODGY)
2864 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
2867 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
2871 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2872 struct net_device *dev,
2873 struct netdev_queue *txq)
2875 spinlock_t *root_lock = qdisc_lock(q);
2879 qdisc_pkt_len_init(skb);
2880 qdisc_calculate_pkt_len(skb, q);
2882 * Heuristic to force contended enqueues to serialize on a
2883 * separate lock before trying to get qdisc main lock.
2884 * This permits __QDISC___STATE_RUNNING owner to get the lock more
2885 * often and dequeue packets faster.
2887 contended = qdisc_is_running(q);
2888 if (unlikely(contended))
2889 spin_lock(&q->busylock);
2891 spin_lock(root_lock);
2892 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2895 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2896 qdisc_run_begin(q)) {
2898 * This is a work-conserving queue; there are no old skbs
2899 * waiting to be sent out; and the qdisc is not running -
2900 * xmit the skb directly.
2903 qdisc_bstats_update(q, skb);
2905 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
2906 if (unlikely(contended)) {
2907 spin_unlock(&q->busylock);
2914 rc = NET_XMIT_SUCCESS;
2916 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2917 if (qdisc_run_begin(q)) {
2918 if (unlikely(contended)) {
2919 spin_unlock(&q->busylock);
2925 spin_unlock(root_lock);
2926 if (unlikely(contended))
2927 spin_unlock(&q->busylock);
2931 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
2932 static void skb_update_prio(struct sk_buff *skb)
2934 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2936 if (!skb->priority && skb->sk && map) {
2937 unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
2939 if (prioidx < map->priomap_len)
2940 skb->priority = map->priomap[prioidx];
2944 #define skb_update_prio(skb)
2947 DEFINE_PER_CPU(int, xmit_recursion);
2948 EXPORT_SYMBOL(xmit_recursion);
2950 #define RECURSION_LIMIT 10
2953 * dev_loopback_xmit - loop back @skb
2954 * @net: network namespace this loopback is happening in
2955 * @sk: sk needed to be a netfilter okfn
2956 * @skb: buffer to transmit
2958 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
2960 skb_reset_mac_header(skb);
2961 __skb_pull(skb, skb_network_offset(skb));
2962 skb->pkt_type = PACKET_LOOPBACK;
2963 skb->ip_summed = CHECKSUM_UNNECESSARY;
2964 WARN_ON(!skb_dst(skb));
2969 EXPORT_SYMBOL(dev_loopback_xmit);
2971 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2974 struct xps_dev_maps *dev_maps;
2975 struct xps_map *map;
2976 int queue_index = -1;
2979 dev_maps = rcu_dereference(dev->xps_maps);
2981 map = rcu_dereference(
2982 dev_maps->cpu_map[skb->sender_cpu - 1]);
2985 queue_index = map->queues[0];
2987 queue_index = map->queues[reciprocal_scale(skb_get_hash(skb),
2989 if (unlikely(queue_index >= dev->real_num_tx_queues))
3001 static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
3003 struct sock *sk = skb->sk;
3004 int queue_index = sk_tx_queue_get(sk);
3006 if (queue_index < 0 || skb->ooo_okay ||
3007 queue_index >= dev->real_num_tx_queues) {
3008 int new_index = get_xps_queue(dev, skb);
3010 new_index = skb_tx_hash(dev, skb);
3012 if (queue_index != new_index && sk &&
3014 rcu_access_pointer(sk->sk_dst_cache))
3015 sk_tx_queue_set(sk, new_index);
3017 queue_index = new_index;
3023 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
3024 struct sk_buff *skb,
3027 int queue_index = 0;
3030 if (skb->sender_cpu == 0)
3031 skb->sender_cpu = raw_smp_processor_id() + 1;
3034 if (dev->real_num_tx_queues != 1) {
3035 const struct net_device_ops *ops = dev->netdev_ops;
3036 if (ops->ndo_select_queue)
3037 queue_index = ops->ndo_select_queue(dev, skb, accel_priv,
3040 queue_index = __netdev_pick_tx(dev, skb);
3043 queue_index = netdev_cap_txqueue(dev, queue_index);
3046 skb_set_queue_mapping(skb, queue_index);
3047 return netdev_get_tx_queue(dev, queue_index);
3051 * __dev_queue_xmit - transmit a buffer
3052 * @skb: buffer to transmit
3053 * @accel_priv: private data used for L2 forwarding offload
3055 * Queue a buffer for transmission to a network device. The caller must
3056 * have set the device and priority and built the buffer before calling
3057 * this function. The function can be called from an interrupt.
3059 * A negative errno code is returned on a failure. A success does not
3060 * guarantee the frame will be transmitted as it may be dropped due
3061 * to congestion or traffic shaping.
3063 * -----------------------------------------------------------------------------------
3064 * I notice this method can also return errors from the queue disciplines,
3065 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3068 * Regardless of the return value, the skb is consumed, so it is currently
3069 * difficult to retry a send to this method. (You can bump the ref count
3070 * before sending to hold a reference for retry if you are careful.)
3072 * When calling this method, interrupts MUST be enabled. This is because
3073 * the BH enable code must have IRQs enabled so that it will not deadlock.
3076 static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
3078 struct net_device *dev = skb->dev;
3079 struct netdev_queue *txq;
3083 skb_reset_mac_header(skb);
3085 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
3086 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
3088 /* Disable soft irqs for various locks below. Also
3089 * stops preemption for RCU.
3093 skb_update_prio(skb);
3095 /* If device/qdisc don't need skb->dst, release it right now while
3096 * its hot in this cpu cache.
3098 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
3103 #ifdef CONFIG_NET_SWITCHDEV
3104 /* Don't forward if offload device already forwarded */
3105 if (skb->offload_fwd_mark &&
3106 skb->offload_fwd_mark == dev->offload_fwd_mark) {
3108 rc = NET_XMIT_SUCCESS;
3113 txq = netdev_pick_tx(dev, skb, accel_priv);
3114 q = rcu_dereference_bh(txq->qdisc);
3116 #ifdef CONFIG_NET_CLS_ACT
3117 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
3119 trace_net_dev_queue(skb);
3121 rc = __dev_xmit_skb(skb, q, dev, txq);
3125 /* The device has no queue. Common case for software devices:
3126 loopback, all the sorts of tunnels...
3128 Really, it is unlikely that netif_tx_lock protection is necessary
3129 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3131 However, it is possible, that they rely on protection
3134 Check this and shot the lock. It is not prone from deadlocks.
3135 Either shot noqueue qdisc, it is even simpler 8)
3137 if (dev->flags & IFF_UP) {
3138 int cpu = smp_processor_id(); /* ok because BHs are off */
3140 if (txq->xmit_lock_owner != cpu) {
3142 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
3143 goto recursion_alert;
3145 skb = validate_xmit_skb(skb, dev);
3149 HARD_TX_LOCK(dev, txq, cpu);
3151 if (!netif_xmit_stopped(txq)) {
3152 __this_cpu_inc(xmit_recursion);
3153 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
3154 __this_cpu_dec(xmit_recursion);
3155 if (dev_xmit_complete(rc)) {
3156 HARD_TX_UNLOCK(dev, txq);
3160 HARD_TX_UNLOCK(dev, txq);
3161 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3164 /* Recursion is detected! It is possible,
3168 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3175 rcu_read_unlock_bh();
3177 atomic_long_inc(&dev->tx_dropped);
3178 kfree_skb_list(skb);
3181 rcu_read_unlock_bh();
3185 int dev_queue_xmit(struct sk_buff *skb)
3187 return __dev_queue_xmit(skb, NULL);
3189 EXPORT_SYMBOL(dev_queue_xmit);
3191 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
3193 return __dev_queue_xmit(skb, accel_priv);
3195 EXPORT_SYMBOL(dev_queue_xmit_accel);
3198 /*=======================================================================
3200 =======================================================================*/
3202 int netdev_max_backlog __read_mostly = 1000;
3203 EXPORT_SYMBOL(netdev_max_backlog);
3205 int netdev_tstamp_prequeue __read_mostly = 1;
3206 int netdev_budget __read_mostly = 300;
3207 int weight_p __read_mostly = 64; /* old backlog weight */
3209 /* Called with irq disabled */
3210 static inline void ____napi_schedule(struct softnet_data *sd,
3211 struct napi_struct *napi)
3213 list_add_tail(&napi->poll_list, &sd->poll_list);
3214 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3219 /* One global table that all flow-based protocols share. */
3220 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
3221 EXPORT_SYMBOL(rps_sock_flow_table);
3222 u32 rps_cpu_mask __read_mostly;
3223 EXPORT_SYMBOL(rps_cpu_mask);
3225 struct static_key rps_needed __read_mostly;
3227 static struct rps_dev_flow *
3228 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3229 struct rps_dev_flow *rflow, u16 next_cpu)
3231 if (next_cpu < nr_cpu_ids) {
3232 #ifdef CONFIG_RFS_ACCEL
3233 struct netdev_rx_queue *rxqueue;
3234 struct rps_dev_flow_table *flow_table;
3235 struct rps_dev_flow *old_rflow;
3240 /* Should we steer this flow to a different hardware queue? */
3241 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
3242 !(dev->features & NETIF_F_NTUPLE))
3244 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
3245 if (rxq_index == skb_get_rx_queue(skb))
3248 rxqueue = dev->_rx + rxq_index;
3249 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3252 flow_id = skb_get_hash(skb) & flow_table->mask;
3253 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
3254 rxq_index, flow_id);
3258 rflow = &flow_table->flows[flow_id];
3260 if (old_rflow->filter == rflow->filter)
3261 old_rflow->filter = RPS_NO_FILTER;
3265 per_cpu(softnet_data, next_cpu).input_queue_head;
3268 rflow->cpu = next_cpu;
3273 * get_rps_cpu is called from netif_receive_skb and returns the target
3274 * CPU from the RPS map of the receiving queue for a given skb.
3275 * rcu_read_lock must be held on entry.
3277 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3278 struct rps_dev_flow **rflowp)
3280 const struct rps_sock_flow_table *sock_flow_table;
3281 struct netdev_rx_queue *rxqueue = dev->_rx;
3282 struct rps_dev_flow_table *flow_table;
3283 struct rps_map *map;
3288 if (skb_rx_queue_recorded(skb)) {
3289 u16 index = skb_get_rx_queue(skb);
3291 if (unlikely(index >= dev->real_num_rx_queues)) {
3292 WARN_ONCE(dev->real_num_rx_queues > 1,
3293 "%s received packet on queue %u, but number "
3294 "of RX queues is %u\n",
3295 dev->name, index, dev->real_num_rx_queues);
3301 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3303 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3304 map = rcu_dereference(rxqueue->rps_map);
3305 if (!flow_table && !map)
3308 skb_reset_network_header(skb);
3309 hash = skb_get_hash(skb);
3313 sock_flow_table = rcu_dereference(rps_sock_flow_table);
3314 if (flow_table && sock_flow_table) {
3315 struct rps_dev_flow *rflow;
3319 /* First check into global flow table if there is a match */
3320 ident = sock_flow_table->ents[hash & sock_flow_table->mask];
3321 if ((ident ^ hash) & ~rps_cpu_mask)
3324 next_cpu = ident & rps_cpu_mask;
3326 /* OK, now we know there is a match,
3327 * we can look at the local (per receive queue) flow table
3329 rflow = &flow_table->flows[hash & flow_table->mask];
3333 * If the desired CPU (where last recvmsg was done) is
3334 * different from current CPU (one in the rx-queue flow
3335 * table entry), switch if one of the following holds:
3336 * - Current CPU is unset (>= nr_cpu_ids).
3337 * - Current CPU is offline.
3338 * - The current CPU's queue tail has advanced beyond the
3339 * last packet that was enqueued using this table entry.
3340 * This guarantees that all previous packets for the flow
3341 * have been dequeued, thus preserving in order delivery.
3343 if (unlikely(tcpu != next_cpu) &&
3344 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
3345 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
3346 rflow->last_qtail)) >= 0)) {
3348 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
3351 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
3361 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
3362 if (cpu_online(tcpu)) {
3372 #ifdef CONFIG_RFS_ACCEL
3375 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3376 * @dev: Device on which the filter was set
3377 * @rxq_index: RX queue index
3378 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3379 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3381 * Drivers that implement ndo_rx_flow_steer() should periodically call
3382 * this function for each installed filter and remove the filters for
3383 * which it returns %true.
3385 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
3386 u32 flow_id, u16 filter_id)
3388 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
3389 struct rps_dev_flow_table *flow_table;
3390 struct rps_dev_flow *rflow;
3395 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3396 if (flow_table && flow_id <= flow_table->mask) {
3397 rflow = &flow_table->flows[flow_id];
3398 cpu = ACCESS_ONCE(rflow->cpu);
3399 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
3400 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
3401 rflow->last_qtail) <
3402 (int)(10 * flow_table->mask)))
3408 EXPORT_SYMBOL(rps_may_expire_flow);
3410 #endif /* CONFIG_RFS_ACCEL */
3412 /* Called from hardirq (IPI) context */
3413 static void rps_trigger_softirq(void *data)
3415 struct softnet_data *sd = data;
3417 ____napi_schedule(sd, &sd->backlog);
3421 #endif /* CONFIG_RPS */
3424 * Check if this softnet_data structure is another cpu one
3425 * If yes, queue it to our IPI list and return 1
3428 static int rps_ipi_queued(struct softnet_data *sd)
3431 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
3434 sd->rps_ipi_next = mysd->rps_ipi_list;
3435 mysd->rps_ipi_list = sd;
3437 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3440 #endif /* CONFIG_RPS */
3444 #ifdef CONFIG_NET_FLOW_LIMIT
3445 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
3448 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
3450 #ifdef CONFIG_NET_FLOW_LIMIT
3451 struct sd_flow_limit *fl;
3452 struct softnet_data *sd;
3453 unsigned int old_flow, new_flow;
3455 if (qlen < (netdev_max_backlog >> 1))
3458 sd = this_cpu_ptr(&softnet_data);
3461 fl = rcu_dereference(sd->flow_limit);
3463 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
3464 old_flow = fl->history[fl->history_head];
3465 fl->history[fl->history_head] = new_flow;
3468 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
3470 if (likely(fl->buckets[old_flow]))
3471 fl->buckets[old_flow]--;
3473 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
3485 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3486 * queue (may be a remote CPU queue).
3488 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
3489 unsigned int *qtail)
3491 struct softnet_data *sd;
3492 unsigned long flags;
3495 sd = &per_cpu(softnet_data, cpu);
3497 local_irq_save(flags);
3500 if (!netif_running(skb->dev))
3502 qlen = skb_queue_len(&sd->input_pkt_queue);
3503 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
3506 __skb_queue_tail(&sd->input_pkt_queue, skb);
3507 input_queue_tail_incr_save(sd, qtail);
3509 local_irq_restore(flags);
3510 return NET_RX_SUCCESS;
3513 /* Schedule NAPI for backlog device
3514 * We can use non atomic operation since we own the queue lock
3516 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
3517 if (!rps_ipi_queued(sd))
3518 ____napi_schedule(sd, &sd->backlog);
3527 local_irq_restore(flags);
3529 atomic_long_inc(&skb->dev->rx_dropped);
3534 static int netif_rx_internal(struct sk_buff *skb)
3538 net_timestamp_check(netdev_tstamp_prequeue, skb);
3540 trace_netif_rx(skb);
3542 if (static_key_false(&rps_needed)) {
3543 struct rps_dev_flow voidflow, *rflow = &voidflow;
3549 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3551 cpu = smp_processor_id();
3553 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3561 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3568 * netif_rx - post buffer to the network code
3569 * @skb: buffer to post
3571 * This function receives a packet from a device driver and queues it for
3572 * the upper (protocol) levels to process. It always succeeds. The buffer
3573 * may be dropped during processing for congestion control or by the
3577 * NET_RX_SUCCESS (no congestion)
3578 * NET_RX_DROP (packet was dropped)
3582 int netif_rx(struct sk_buff *skb)
3584 trace_netif_rx_entry(skb);
3586 return netif_rx_internal(skb);
3588 EXPORT_SYMBOL(netif_rx);
3590 int netif_rx_ni(struct sk_buff *skb)
3594 trace_netif_rx_ni_entry(skb);
3597 err = netif_rx_internal(skb);
3598 if (local_softirq_pending())
3604 EXPORT_SYMBOL(netif_rx_ni);
3606 static void net_tx_action(struct softirq_action *h)
3608 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
3610 if (sd->completion_queue) {
3611 struct sk_buff *clist;
3613 local_irq_disable();
3614 clist = sd->completion_queue;
3615 sd->completion_queue = NULL;
3619 struct sk_buff *skb = clist;
3620 clist = clist->next;
3622 WARN_ON(atomic_read(&skb->users));
3623 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
3624 trace_consume_skb(skb);
3626 trace_kfree_skb(skb, net_tx_action);
3631 if (sd->output_queue) {
3634 local_irq_disable();
3635 head = sd->output_queue;
3636 sd->output_queue = NULL;
3637 sd->output_queue_tailp = &sd->output_queue;
3641 struct Qdisc *q = head;
3642 spinlock_t *root_lock;
3644 head = head->next_sched;
3646 root_lock = qdisc_lock(q);
3647 if (spin_trylock(root_lock)) {
3648 smp_mb__before_atomic();
3649 clear_bit(__QDISC_STATE_SCHED,
3652 spin_unlock(root_lock);
3654 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3656 __netif_reschedule(q);
3658 smp_mb__before_atomic();
3659 clear_bit(__QDISC_STATE_SCHED,
3667 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3668 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3669 /* This hook is defined here for ATM LANE */
3670 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3671 unsigned char *addr) __read_mostly;
3672 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3675 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3676 struct packet_type **pt_prev,
3677 int *ret, struct net_device *orig_dev)
3679 #ifdef CONFIG_NET_CLS_ACT
3680 struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list);
3681 struct tcf_result cl_res;
3683 /* If there's at least one ingress present somewhere (so
3684 * we get here via enabled static key), remaining devices
3685 * that are not configured with an ingress qdisc will bail
3691 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3695 qdisc_skb_cb(skb)->pkt_len = skb->len;
3696 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3697 qdisc_bstats_cpu_update(cl->q, skb);
3699 switch (tc_classify(skb, cl, &cl_res, false)) {
3701 case TC_ACT_RECLASSIFY:
3702 skb->tc_index = TC_H_MIN(cl_res.classid);
3705 qdisc_qstats_cpu_drop(cl->q);
3710 case TC_ACT_REDIRECT:
3711 /* skb_mac_header check was done by cls/act_bpf, so
3712 * we can safely push the L2 header back before
3713 * redirecting to another netdev
3715 __skb_push(skb, skb->mac_len);
3716 skb_do_redirect(skb);
3721 #endif /* CONFIG_NET_CLS_ACT */
3726 * netdev_is_rx_handler_busy - check if receive handler is registered
3727 * @dev: device to check
3729 * Check if a receive handler is already registered for a given device.
3730 * Return true if there one.
3732 * The caller must hold the rtnl_mutex.
3734 bool netdev_is_rx_handler_busy(struct net_device *dev)
3737 return dev && rtnl_dereference(dev->rx_handler);
3739 EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);
3742 * netdev_rx_handler_register - register receive handler
3743 * @dev: device to register a handler for
3744 * @rx_handler: receive handler to register
3745 * @rx_handler_data: data pointer that is used by rx handler
3747 * Register a receive handler for a device. This handler will then be
3748 * called from __netif_receive_skb. A negative errno code is returned
3751 * The caller must hold the rtnl_mutex.
3753 * For a general description of rx_handler, see enum rx_handler_result.
3755 int netdev_rx_handler_register(struct net_device *dev,
3756 rx_handler_func_t *rx_handler,
3757 void *rx_handler_data)
3761 if (dev->rx_handler)
3764 /* Note: rx_handler_data must be set before rx_handler */
3765 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3766 rcu_assign_pointer(dev->rx_handler, rx_handler);
3770 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3773 * netdev_rx_handler_unregister - unregister receive handler
3774 * @dev: device to unregister a handler from
3776 * Unregister a receive handler from a device.
3778 * The caller must hold the rtnl_mutex.
3780 void netdev_rx_handler_unregister(struct net_device *dev)
3784 RCU_INIT_POINTER(dev->rx_handler, NULL);
3785 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3786 * section has a guarantee to see a non NULL rx_handler_data
3790 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3792 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3795 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3796 * the special handling of PFMEMALLOC skbs.
3798 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
3800 switch (skb->protocol) {
3801 case htons(ETH_P_ARP):
3802 case htons(ETH_P_IP):
3803 case htons(ETH_P_IPV6):
3804 case htons(ETH_P_8021Q):
3805 case htons(ETH_P_8021AD):
3812 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
3813 int *ret, struct net_device *orig_dev)
3815 #ifdef CONFIG_NETFILTER_INGRESS
3816 if (nf_hook_ingress_active(skb)) {
3818 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3822 return nf_hook_ingress(skb);
3824 #endif /* CONFIG_NETFILTER_INGRESS */
3828 static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
3830 struct packet_type *ptype, *pt_prev;
3831 rx_handler_func_t *rx_handler;
3832 struct net_device *orig_dev;
3833 bool deliver_exact = false;
3834 int ret = NET_RX_DROP;
3837 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3839 trace_netif_receive_skb(skb);
3841 orig_dev = skb->dev;
3843 skb_reset_network_header(skb);
3844 if (!skb_transport_header_was_set(skb))
3845 skb_reset_transport_header(skb);
3846 skb_reset_mac_len(skb);
3851 skb->skb_iif = skb->dev->ifindex;
3853 __this_cpu_inc(softnet_data.processed);
3855 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
3856 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
3857 skb = skb_vlan_untag(skb);
3862 #ifdef CONFIG_NET_CLS_ACT
3863 if (skb->tc_verd & TC_NCLS) {
3864 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3872 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3874 ret = deliver_skb(skb, pt_prev, orig_dev);
3878 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
3880 ret = deliver_skb(skb, pt_prev, orig_dev);
3885 #ifdef CONFIG_NET_INGRESS
3886 if (static_key_false(&ingress_needed)) {
3887 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3891 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
3895 #ifdef CONFIG_NET_CLS_ACT
3899 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
3902 if (skb_vlan_tag_present(skb)) {
3904 ret = deliver_skb(skb, pt_prev, orig_dev);
3907 if (vlan_do_receive(&skb))
3909 else if (unlikely(!skb))
3913 rx_handler = rcu_dereference(skb->dev->rx_handler);
3916 ret = deliver_skb(skb, pt_prev, orig_dev);
3919 switch (rx_handler(&skb)) {
3920 case RX_HANDLER_CONSUMED:
3921 ret = NET_RX_SUCCESS;
3923 case RX_HANDLER_ANOTHER:
3925 case RX_HANDLER_EXACT:
3926 deliver_exact = true;
3927 case RX_HANDLER_PASS:
3934 if (unlikely(skb_vlan_tag_present(skb))) {
3935 if (skb_vlan_tag_get_id(skb))
3936 skb->pkt_type = PACKET_OTHERHOST;
3937 /* Note: we might in the future use prio bits
3938 * and set skb->priority like in vlan_do_receive()
3939 * For the time being, just ignore Priority Code Point
3944 type = skb->protocol;
3946 /* deliver only exact match when indicated */
3947 if (likely(!deliver_exact)) {
3948 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
3949 &ptype_base[ntohs(type) &
3953 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
3954 &orig_dev->ptype_specific);
3956 if (unlikely(skb->dev != orig_dev)) {
3957 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
3958 &skb->dev->ptype_specific);
3962 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
3965 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3968 atomic_long_inc(&skb->dev->rx_dropped);
3970 /* Jamal, now you will not able to escape explaining
3971 * me how you were going to use this. :-)
3980 static int __netif_receive_skb(struct sk_buff *skb)
3984 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
3985 unsigned long pflags = current->flags;
3988 * PFMEMALLOC skbs are special, they should
3989 * - be delivered to SOCK_MEMALLOC sockets only
3990 * - stay away from userspace
3991 * - have bounded memory usage
3993 * Use PF_MEMALLOC as this saves us from propagating the allocation
3994 * context down to all allocation sites.
3996 current->flags |= PF_MEMALLOC;
3997 ret = __netif_receive_skb_core(skb, true);
3998 tsk_restore_flags(current, pflags, PF_MEMALLOC);
4000 ret = __netif_receive_skb_core(skb, false);
4005 static int netif_receive_skb_internal(struct sk_buff *skb)
4009 net_timestamp_check(netdev_tstamp_prequeue, skb);
4011 if (skb_defer_rx_timestamp(skb))
4012 return NET_RX_SUCCESS;
4017 if (static_key_false(&rps_needed)) {
4018 struct rps_dev_flow voidflow, *rflow = &voidflow;
4019 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
4022 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
4028 ret = __netif_receive_skb(skb);
4034 * netif_receive_skb - process receive buffer from network
4035 * @skb: buffer to process
4037 * netif_receive_skb() is the main receive data processing function.
4038 * It always succeeds. The buffer may be dropped during processing
4039 * for congestion control or by the protocol layers.
4041 * This function may only be called from softirq context and interrupts
4042 * should be enabled.
4044 * Return values (usually ignored):
4045 * NET_RX_SUCCESS: no congestion
4046 * NET_RX_DROP: packet was dropped
4048 int netif_receive_skb(struct sk_buff *skb)
4050 trace_netif_receive_skb_entry(skb);
4052 return netif_receive_skb_internal(skb);
4054 EXPORT_SYMBOL(netif_receive_skb);
4056 /* Network device is going away, flush any packets still pending
4057 * Called with irqs disabled.
4059 static void flush_backlog(void *arg)
4061 struct net_device *dev = arg;
4062 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
4063 struct sk_buff *skb, *tmp;
4066 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
4067 if (skb->dev == dev) {
4068 __skb_unlink(skb, &sd->input_pkt_queue);
4070 input_queue_head_incr(sd);
4075 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
4076 if (skb->dev == dev) {
4077 __skb_unlink(skb, &sd->process_queue);
4079 input_queue_head_incr(sd);
4084 static int napi_gro_complete(struct sk_buff *skb)
4086 struct packet_offload *ptype;
4087 __be16 type = skb->protocol;
4088 struct list_head *head = &offload_base;
4091 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
4093 if (NAPI_GRO_CB(skb)->count == 1) {
4094 skb_shinfo(skb)->gso_size = 0;
4099 list_for_each_entry_rcu(ptype, head, list) {
4100 if (ptype->type != type || !ptype->callbacks.gro_complete)
4103 err = ptype->callbacks.gro_complete(skb, 0);
4109 WARN_ON(&ptype->list == head);
4111 return NET_RX_SUCCESS;
4115 return netif_receive_skb_internal(skb);
4118 /* napi->gro_list contains packets ordered by age.
4119 * youngest packets at the head of it.
4120 * Complete skbs in reverse order to reduce latencies.
4122 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
4124 struct sk_buff *skb, *prev = NULL;
4126 /* scan list and build reverse chain */
4127 for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
4132 for (skb = prev; skb; skb = prev) {
4135 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
4139 napi_gro_complete(skb);
4143 napi->gro_list = NULL;
4145 EXPORT_SYMBOL(napi_gro_flush);
4147 static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
4150 unsigned int maclen = skb->dev->hard_header_len;
4151 u32 hash = skb_get_hash_raw(skb);
4153 for (p = napi->gro_list; p; p = p->next) {
4154 unsigned long diffs;
4156 NAPI_GRO_CB(p)->flush = 0;
4158 if (hash != skb_get_hash_raw(p)) {
4159 NAPI_GRO_CB(p)->same_flow = 0;
4163 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
4164 diffs |= p->vlan_tci ^ skb->vlan_tci;
4165 diffs |= skb_metadata_dst_cmp(p, skb);
4166 if (maclen == ETH_HLEN)
4167 diffs |= compare_ether_header(skb_mac_header(p),
4168 skb_mac_header(skb));
4170 diffs = memcmp(skb_mac_header(p),
4171 skb_mac_header(skb),
4173 NAPI_GRO_CB(p)->same_flow = !diffs;
4177 static void skb_gro_reset_offset(struct sk_buff *skb)
4179 const struct skb_shared_info *pinfo = skb_shinfo(skb);
4180 const skb_frag_t *frag0 = &pinfo->frags[0];
4182 NAPI_GRO_CB(skb)->data_offset = 0;
4183 NAPI_GRO_CB(skb)->frag0 = NULL;
4184 NAPI_GRO_CB(skb)->frag0_len = 0;
4186 if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
4188 !PageHighMem(skb_frag_page(frag0))) {
4189 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
4190 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
4194 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
4196 struct skb_shared_info *pinfo = skb_shinfo(skb);
4198 BUG_ON(skb->end - skb->tail < grow);
4200 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
4202 skb->data_len -= grow;
4205 pinfo->frags[0].page_offset += grow;
4206 skb_frag_size_sub(&pinfo->frags[0], grow);
4208 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
4209 skb_frag_unref(skb, 0);
4210 memmove(pinfo->frags, pinfo->frags + 1,
4211 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
4215 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4217 struct sk_buff **pp = NULL;
4218 struct packet_offload *ptype;
4219 __be16 type = skb->protocol;
4220 struct list_head *head = &offload_base;
4222 enum gro_result ret;
4225 if (!(skb->dev->features & NETIF_F_GRO))
4228 if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad)
4231 gro_list_prepare(napi, skb);
4234 list_for_each_entry_rcu(ptype, head, list) {
4235 if (ptype->type != type || !ptype->callbacks.gro_receive)
4238 skb_set_network_header(skb, skb_gro_offset(skb));
4239 skb_reset_mac_len(skb);
4240 NAPI_GRO_CB(skb)->same_flow = 0;
4241 NAPI_GRO_CB(skb)->flush = 0;
4242 NAPI_GRO_CB(skb)->free = 0;
4243 NAPI_GRO_CB(skb)->encap_mark = 0;
4244 NAPI_GRO_CB(skb)->recursion_counter = 0;
4245 NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
4247 /* Setup for GRO checksum validation */
4248 switch (skb->ip_summed) {
4249 case CHECKSUM_COMPLETE:
4250 NAPI_GRO_CB(skb)->csum = skb->csum;
4251 NAPI_GRO_CB(skb)->csum_valid = 1;
4252 NAPI_GRO_CB(skb)->csum_cnt = 0;
4254 case CHECKSUM_UNNECESSARY:
4255 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
4256 NAPI_GRO_CB(skb)->csum_valid = 0;
4259 NAPI_GRO_CB(skb)->csum_cnt = 0;
4260 NAPI_GRO_CB(skb)->csum_valid = 0;
4263 pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
4268 if (&ptype->list == head)
4271 same_flow = NAPI_GRO_CB(skb)->same_flow;
4272 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
4275 struct sk_buff *nskb = *pp;
4279 napi_gro_complete(nskb);
4286 if (NAPI_GRO_CB(skb)->flush)
4289 if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
4290 struct sk_buff *nskb = napi->gro_list;
4292 /* locate the end of the list to select the 'oldest' flow */
4293 while (nskb->next) {
4299 napi_gro_complete(nskb);
4303 NAPI_GRO_CB(skb)->count = 1;
4304 NAPI_GRO_CB(skb)->age = jiffies;
4305 NAPI_GRO_CB(skb)->last = skb;
4306 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
4307 skb->next = napi->gro_list;
4308 napi->gro_list = skb;
4312 grow = skb_gro_offset(skb) - skb_headlen(skb);
4314 gro_pull_from_frag0(skb, grow);
4323 struct packet_offload *gro_find_receive_by_type(__be16 type)
4325 struct list_head *offload_head = &offload_base;
4326 struct packet_offload *ptype;
4328 list_for_each_entry_rcu(ptype, offload_head, list) {
4329 if (ptype->type != type || !ptype->callbacks.gro_receive)
4335 EXPORT_SYMBOL(gro_find_receive_by_type);
4337 struct packet_offload *gro_find_complete_by_type(__be16 type)
4339 struct list_head *offload_head = &offload_base;
4340 struct packet_offload *ptype;
4342 list_for_each_entry_rcu(ptype, offload_head, list) {
4343 if (ptype->type != type || !ptype->callbacks.gro_complete)
4349 EXPORT_SYMBOL(gro_find_complete_by_type);
4351 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
4355 if (netif_receive_skb_internal(skb))
4363 case GRO_MERGED_FREE:
4364 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) {
4366 kmem_cache_free(skbuff_head_cache, skb);
4380 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4382 trace_napi_gro_receive_entry(skb);
4384 skb_gro_reset_offset(skb);
4386 return napi_skb_finish(dev_gro_receive(napi, skb), skb);
4388 EXPORT_SYMBOL(napi_gro_receive);
4390 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
4392 if (unlikely(skb->pfmemalloc)) {
4396 __skb_pull(skb, skb_headlen(skb));
4397 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4398 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
4400 skb->dev = napi->dev;
4402 skb->encapsulation = 0;
4403 skb_shinfo(skb)->gso_type = 0;
4404 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
4409 struct sk_buff *napi_get_frags(struct napi_struct *napi)
4411 struct sk_buff *skb = napi->skb;
4414 skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
4419 EXPORT_SYMBOL(napi_get_frags);
4421 static gro_result_t napi_frags_finish(struct napi_struct *napi,
4422 struct sk_buff *skb,
4428 __skb_push(skb, ETH_HLEN);
4429 skb->protocol = eth_type_trans(skb, skb->dev);
4430 if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
4435 case GRO_MERGED_FREE:
4436 napi_reuse_skb(napi, skb);
4446 /* Upper GRO stack assumes network header starts at gro_offset=0
4447 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4448 * We copy ethernet header into skb->data to have a common layout.
4450 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
4452 struct sk_buff *skb = napi->skb;
4453 const struct ethhdr *eth;
4454 unsigned int hlen = sizeof(*eth);
4458 skb_reset_mac_header(skb);
4459 skb_gro_reset_offset(skb);
4461 eth = skb_gro_header_fast(skb, 0);
4462 if (unlikely(skb_gro_header_hard(skb, hlen))) {
4463 eth = skb_gro_header_slow(skb, hlen, 0);
4464 if (unlikely(!eth)) {
4465 napi_reuse_skb(napi, skb);
4469 gro_pull_from_frag0(skb, hlen);
4470 NAPI_GRO_CB(skb)->frag0 += hlen;
4471 NAPI_GRO_CB(skb)->frag0_len -= hlen;
4473 __skb_pull(skb, hlen);
4476 * This works because the only protocols we care about don't require
4478 * We'll fix it up properly in napi_frags_finish()
4480 skb->protocol = eth->h_proto;
4485 gro_result_t napi_gro_frags(struct napi_struct *napi)
4487 struct sk_buff *skb = napi_frags_skb(napi);
4492 trace_napi_gro_frags_entry(skb);
4494 return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
4496 EXPORT_SYMBOL(napi_gro_frags);
4498 /* Compute the checksum from gro_offset and return the folded value
4499 * after adding in any pseudo checksum.
4501 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
4506 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
4508 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4509 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
4511 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
4512 !skb->csum_complete_sw)
4513 netdev_rx_csum_fault(skb->dev);
4516 NAPI_GRO_CB(skb)->csum = wsum;
4517 NAPI_GRO_CB(skb)->csum_valid = 1;
4521 EXPORT_SYMBOL(__skb_gro_checksum_complete);
4524 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4525 * Note: called with local irq disabled, but exits with local irq enabled.
4527 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
4530 struct softnet_data *remsd = sd->rps_ipi_list;
4533 sd->rps_ipi_list = NULL;
4537 /* Send pending IPI's to kick RPS processing on remote cpus. */
4539 struct softnet_data *next = remsd->rps_ipi_next;
4541 if (cpu_online(remsd->cpu))
4542 smp_call_function_single_async(remsd->cpu,
4551 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
4554 return sd->rps_ipi_list != NULL;
4560 static int process_backlog(struct napi_struct *napi, int quota)
4563 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
4565 /* Check if we have pending ipi, its better to send them now,
4566 * not waiting net_rx_action() end.
4568 if (sd_has_rps_ipi_waiting(sd)) {
4569 local_irq_disable();
4570 net_rps_action_and_irq_enable(sd);
4573 napi->weight = weight_p;
4574 local_irq_disable();
4576 struct sk_buff *skb;
4578 while ((skb = __skb_dequeue(&sd->process_queue))) {
4581 __netif_receive_skb(skb);
4583 local_irq_disable();
4584 input_queue_head_incr(sd);
4585 if (++work >= quota) {
4592 if (skb_queue_empty(&sd->input_pkt_queue)) {
4594 * Inline a custom version of __napi_complete().
4595 * only current cpu owns and manipulates this napi,
4596 * and NAPI_STATE_SCHED is the only possible flag set
4598 * We can use a plain write instead of clear_bit(),
4599 * and we dont need an smp_mb() memory barrier.
4607 skb_queue_splice_tail_init(&sd->input_pkt_queue,
4608 &sd->process_queue);
4617 * __napi_schedule - schedule for receive
4618 * @n: entry to schedule
4620 * The entry's receive function will be scheduled to run.
4621 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4623 void __napi_schedule(struct napi_struct *n)
4625 unsigned long flags;
4627 local_irq_save(flags);
4628 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4629 local_irq_restore(flags);
4631 EXPORT_SYMBOL(__napi_schedule);
4634 * __napi_schedule_irqoff - schedule for receive
4635 * @n: entry to schedule
4637 * Variant of __napi_schedule() assuming hard irqs are masked
4639 void __napi_schedule_irqoff(struct napi_struct *n)
4641 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4643 EXPORT_SYMBOL(__napi_schedule_irqoff);
4645 void __napi_complete(struct napi_struct *n)
4647 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
4649 list_del_init(&n->poll_list);
4650 smp_mb__before_atomic();
4651 clear_bit(NAPI_STATE_SCHED, &n->state);
4653 EXPORT_SYMBOL(__napi_complete);
4655 void napi_complete_done(struct napi_struct *n, int work_done)
4657 unsigned long flags;
4660 * don't let napi dequeue from the cpu poll list
4661 * just in case its running on a different cpu
4663 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
4667 unsigned long timeout = 0;
4670 timeout = n->dev->gro_flush_timeout;
4673 hrtimer_start(&n->timer, ns_to_ktime(timeout),
4674 HRTIMER_MODE_REL_PINNED);
4676 napi_gro_flush(n, false);
4678 if (likely(list_empty(&n->poll_list))) {
4679 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED, &n->state));
4681 /* If n->poll_list is not empty, we need to mask irqs */
4682 local_irq_save(flags);
4684 local_irq_restore(flags);
4687 EXPORT_SYMBOL(napi_complete_done);
4689 /* must be called under rcu_read_lock(), as we dont take a reference */
4690 struct napi_struct *napi_by_id(unsigned int napi_id)
4692 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
4693 struct napi_struct *napi;
4695 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
4696 if (napi->napi_id == napi_id)
4701 EXPORT_SYMBOL_GPL(napi_by_id);
4703 void napi_hash_add(struct napi_struct *napi)
4705 if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) {
4707 spin_lock(&napi_hash_lock);
4709 /* 0 is not a valid id, we also skip an id that is taken
4710 * we expect both events to be extremely rare
4713 while (!napi->napi_id) {
4714 napi->napi_id = ++napi_gen_id;
4715 if (napi_by_id(napi->napi_id))
4719 hlist_add_head_rcu(&napi->napi_hash_node,
4720 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
4722 spin_unlock(&napi_hash_lock);
4725 EXPORT_SYMBOL_GPL(napi_hash_add);
4727 /* Warning : caller is responsible to make sure rcu grace period
4728 * is respected before freeing memory containing @napi
4730 void napi_hash_del(struct napi_struct *napi)
4732 spin_lock(&napi_hash_lock);
4734 if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state))
4735 hlist_del_rcu(&napi->napi_hash_node);
4737 spin_unlock(&napi_hash_lock);
4739 EXPORT_SYMBOL_GPL(napi_hash_del);
4741 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
4743 struct napi_struct *napi;
4745 napi = container_of(timer, struct napi_struct, timer);
4747 napi_schedule(napi);
4749 return HRTIMER_NORESTART;
4752 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
4753 int (*poll)(struct napi_struct *, int), int weight)
4755 INIT_LIST_HEAD(&napi->poll_list);
4756 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
4757 napi->timer.function = napi_watchdog;
4758 napi->gro_count = 0;
4759 napi->gro_list = NULL;
4762 if (weight > NAPI_POLL_WEIGHT)
4763 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
4765 napi->weight = weight;
4766 list_add(&napi->dev_list, &dev->napi_list);
4768 #ifdef CONFIG_NETPOLL
4769 spin_lock_init(&napi->poll_lock);
4770 napi->poll_owner = -1;
4772 set_bit(NAPI_STATE_SCHED, &napi->state);
4774 EXPORT_SYMBOL(netif_napi_add);
4776 void napi_disable(struct napi_struct *n)
4779 set_bit(NAPI_STATE_DISABLE, &n->state);
4781 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
4783 while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state))
4786 hrtimer_cancel(&n->timer);
4788 clear_bit(NAPI_STATE_DISABLE, &n->state);
4790 EXPORT_SYMBOL(napi_disable);
4792 void netif_napi_del(struct napi_struct *napi)
4794 list_del_init(&napi->dev_list);
4795 napi_free_frags(napi);
4797 kfree_skb_list(napi->gro_list);
4798 napi->gro_list = NULL;
4799 napi->gro_count = 0;
4801 EXPORT_SYMBOL(netif_napi_del);
4803 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
4808 list_del_init(&n->poll_list);
4810 have = netpoll_poll_lock(n);
4814 /* This NAPI_STATE_SCHED test is for avoiding a race
4815 * with netpoll's poll_napi(). Only the entity which
4816 * obtains the lock and sees NAPI_STATE_SCHED set will
4817 * actually make the ->poll() call. Therefore we avoid
4818 * accidentally calling ->poll() when NAPI is not scheduled.
4821 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
4822 work = n->poll(n, weight);
4826 WARN_ON_ONCE(work > weight);
4828 if (likely(work < weight))
4831 /* Drivers must not modify the NAPI state if they
4832 * consume the entire weight. In such cases this code
4833 * still "owns" the NAPI instance and therefore can
4834 * move the instance around on the list at-will.
4836 if (unlikely(napi_disable_pending(n))) {
4842 /* flush too old packets
4843 * If HZ < 1000, flush all packets.
4845 napi_gro_flush(n, HZ >= 1000);
4848 /* Some drivers may have called napi_schedule
4849 * prior to exhausting their budget.
4851 if (unlikely(!list_empty(&n->poll_list))) {
4852 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
4853 n->dev ? n->dev->name : "backlog");
4857 list_add_tail(&n->poll_list, repoll);
4860 netpoll_poll_unlock(have);
4865 static void net_rx_action(struct softirq_action *h)
4867 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
4868 unsigned long time_limit = jiffies + 2;
4869 int budget = netdev_budget;
4873 local_irq_disable();
4874 list_splice_init(&sd->poll_list, &list);
4878 struct napi_struct *n;
4880 if (list_empty(&list)) {
4881 if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
4886 n = list_first_entry(&list, struct napi_struct, poll_list);
4887 budget -= napi_poll(n, &repoll);
4889 /* If softirq window is exhausted then punt.
4890 * Allow this to run for 2 jiffies since which will allow
4891 * an average latency of 1.5/HZ.
4893 if (unlikely(budget <= 0 ||
4894 time_after_eq(jiffies, time_limit))) {
4900 local_irq_disable();
4902 list_splice_tail_init(&sd->poll_list, &list);
4903 list_splice_tail(&repoll, &list);
4904 list_splice(&list, &sd->poll_list);
4905 if (!list_empty(&sd->poll_list))
4906 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4908 net_rps_action_and_irq_enable(sd);
4911 struct netdev_adjacent {
4912 struct net_device *dev;
4914 /* upper master flag, there can only be one master device per list */
4917 /* counter for the number of times this device was added to us */
4920 /* private field for the users */
4923 struct list_head list;
4924 struct rcu_head rcu;
4927 static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
4928 struct list_head *adj_list)
4930 struct netdev_adjacent *adj;
4932 list_for_each_entry(adj, adj_list, list) {
4933 if (adj->dev == adj_dev)
4940 * netdev_has_upper_dev - Check if device is linked to an upper device
4942 * @upper_dev: upper device to check
4944 * Find out if a device is linked to specified upper device and return true
4945 * in case it is. Note that this checks only immediate upper device,
4946 * not through a complete stack of devices. The caller must hold the RTNL lock.
4948 bool netdev_has_upper_dev(struct net_device *dev,
4949 struct net_device *upper_dev)
4953 return __netdev_find_adj(upper_dev, &dev->all_adj_list.upper);
4955 EXPORT_SYMBOL(netdev_has_upper_dev);
4958 * netdev_has_any_upper_dev - Check if device is linked to some device
4961 * Find out if a device is linked to an upper device and return true in case
4962 * it is. The caller must hold the RTNL lock.
4964 static bool netdev_has_any_upper_dev(struct net_device *dev)
4968 return !list_empty(&dev->all_adj_list.upper);
4972 * netdev_master_upper_dev_get - Get master upper device
4975 * Find a master upper device and return pointer to it or NULL in case
4976 * it's not there. The caller must hold the RTNL lock.
4978 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
4980 struct netdev_adjacent *upper;
4984 if (list_empty(&dev->adj_list.upper))
4987 upper = list_first_entry(&dev->adj_list.upper,
4988 struct netdev_adjacent, list);
4989 if (likely(upper->master))
4993 EXPORT_SYMBOL(netdev_master_upper_dev_get);
4995 void *netdev_adjacent_get_private(struct list_head *adj_list)
4997 struct netdev_adjacent *adj;
4999 adj = list_entry(adj_list, struct netdev_adjacent, list);
5001 return adj->private;
5003 EXPORT_SYMBOL(netdev_adjacent_get_private);
5006 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
5008 * @iter: list_head ** of the current position
5010 * Gets the next device from the dev's upper list, starting from iter
5011 * position. The caller must hold RCU read lock.
5013 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
5014 struct list_head **iter)
5016 struct netdev_adjacent *upper;
5018 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5020 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5022 if (&upper->list == &dev->adj_list.upper)
5025 *iter = &upper->list;
5029 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
5032 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
5034 * @iter: list_head ** of the current position
5036 * Gets the next device from the dev's upper list, starting from iter
5037 * position. The caller must hold RCU read lock.
5039 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
5040 struct list_head **iter)
5042 struct netdev_adjacent *upper;
5044 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5046 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5048 if (&upper->list == &dev->all_adj_list.upper)
5051 *iter = &upper->list;
5055 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu);
5058 * netdev_lower_get_next_private - Get the next ->private from the
5059 * lower neighbour list
5061 * @iter: list_head ** of the current position
5063 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5064 * list, starting from iter position. The caller must hold either hold the
5065 * RTNL lock or its own locking that guarantees that the neighbour lower
5066 * list will remain unchanged.
5068 void *netdev_lower_get_next_private(struct net_device *dev,
5069 struct list_head **iter)
5071 struct netdev_adjacent *lower;
5073 lower = list_entry(*iter, struct netdev_adjacent, list);
5075 if (&lower->list == &dev->adj_list.lower)
5078 *iter = lower->list.next;
5080 return lower->private;
5082 EXPORT_SYMBOL(netdev_lower_get_next_private);
5085 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5086 * lower neighbour list, RCU
5089 * @iter: list_head ** of the current position
5091 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5092 * list, starting from iter position. The caller must hold RCU read lock.
5094 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
5095 struct list_head **iter)
5097 struct netdev_adjacent *lower;
5099 WARN_ON_ONCE(!rcu_read_lock_held());
5101 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5103 if (&lower->list == &dev->adj_list.lower)
5106 *iter = &lower->list;
5108 return lower->private;
5110 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
5113 * netdev_lower_get_next - Get the next device from the lower neighbour
5116 * @iter: list_head ** of the current position
5118 * Gets the next netdev_adjacent from the dev's lower neighbour
5119 * list, starting from iter position. The caller must hold RTNL lock or
5120 * its own locking that guarantees that the neighbour lower
5121 * list will remain unchanged.
5123 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
5125 struct netdev_adjacent *lower;
5127 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
5129 if (&lower->list == &dev->adj_list.lower)
5132 *iter = &lower->list;
5136 EXPORT_SYMBOL(netdev_lower_get_next);
5139 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5140 * lower neighbour list, RCU
5144 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5145 * list. The caller must hold RCU read lock.
5147 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
5149 struct netdev_adjacent *lower;
5151 lower = list_first_or_null_rcu(&dev->adj_list.lower,
5152 struct netdev_adjacent, list);
5154 return lower->private;
5157 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
5160 * netdev_master_upper_dev_get_rcu - Get master upper device
5163 * Find a master upper device and return pointer to it or NULL in case
5164 * it's not there. The caller must hold the RCU read lock.
5166 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
5168 struct netdev_adjacent *upper;
5170 upper = list_first_or_null_rcu(&dev->adj_list.upper,
5171 struct netdev_adjacent, list);
5172 if (upper && likely(upper->master))
5176 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
5178 static int netdev_adjacent_sysfs_add(struct net_device *dev,
5179 struct net_device *adj_dev,
5180 struct list_head *dev_list)
5182 char linkname[IFNAMSIZ+7];
5183 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5184 "upper_%s" : "lower_%s", adj_dev->name);
5185 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
5188 static void netdev_adjacent_sysfs_del(struct net_device *dev,
5190 struct list_head *dev_list)
5192 char linkname[IFNAMSIZ+7];
5193 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5194 "upper_%s" : "lower_%s", name);
5195 sysfs_remove_link(&(dev->dev.kobj), linkname);
5198 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
5199 struct net_device *adj_dev,
5200 struct list_head *dev_list)
5202 return (dev_list == &dev->adj_list.upper ||
5203 dev_list == &dev->adj_list.lower) &&
5204 net_eq(dev_net(dev), dev_net(adj_dev));
5207 static int __netdev_adjacent_dev_insert(struct net_device *dev,
5208 struct net_device *adj_dev,
5210 struct list_head *dev_list,
5211 void *private, bool master)
5213 struct netdev_adjacent *adj;
5216 adj = __netdev_find_adj(adj_dev, dev_list);
5219 adj->ref_nr += ref_nr;
5223 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
5228 adj->master = master;
5229 adj->ref_nr = ref_nr;
5230 adj->private = private;
5233 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5234 adj_dev->name, dev->name, adj_dev->name);
5236 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
5237 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
5242 /* Ensure that master link is always the first item in list. */
5244 ret = sysfs_create_link(&(dev->dev.kobj),
5245 &(adj_dev->dev.kobj), "master");
5247 goto remove_symlinks;
5249 list_add_rcu(&adj->list, dev_list);
5251 list_add_tail_rcu(&adj->list, dev_list);
5257 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5258 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5266 static void __netdev_adjacent_dev_remove(struct net_device *dev,
5267 struct net_device *adj_dev,
5269 struct list_head *dev_list)
5271 struct netdev_adjacent *adj;
5273 adj = __netdev_find_adj(adj_dev, dev_list);
5276 pr_err("tried to remove device %s from %s\n",
5277 dev->name, adj_dev->name);
5281 if (adj->ref_nr > ref_nr) {
5282 pr_debug("%s to %s ref_nr-%d = %d\n", dev->name, adj_dev->name,
5283 ref_nr, adj->ref_nr-ref_nr);
5284 adj->ref_nr -= ref_nr;
5289 sysfs_remove_link(&(dev->dev.kobj), "master");
5291 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5292 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5294 list_del_rcu(&adj->list);
5295 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5296 adj_dev->name, dev->name, adj_dev->name);
5298 kfree_rcu(adj, rcu);
5301 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
5302 struct net_device *upper_dev,
5304 struct list_head *up_list,
5305 struct list_head *down_list,
5306 void *private, bool master)
5310 ret = __netdev_adjacent_dev_insert(dev, upper_dev, ref_nr, up_list,
5315 ret = __netdev_adjacent_dev_insert(upper_dev, dev, ref_nr, down_list,
5318 __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list);
5325 static int __netdev_adjacent_dev_link(struct net_device *dev,
5326 struct net_device *upper_dev,
5329 return __netdev_adjacent_dev_link_lists(dev, upper_dev, ref_nr,
5330 &dev->all_adj_list.upper,
5331 &upper_dev->all_adj_list.lower,
5335 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
5336 struct net_device *upper_dev,
5338 struct list_head *up_list,
5339 struct list_head *down_list)
5341 __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list);
5342 __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list);
5345 static void __netdev_adjacent_dev_unlink(struct net_device *dev,
5346 struct net_device *upper_dev,
5349 __netdev_adjacent_dev_unlink_lists(dev, upper_dev, ref_nr,
5350 &dev->all_adj_list.upper,
5351 &upper_dev->all_adj_list.lower);
5354 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
5355 struct net_device *upper_dev,
5356 void *private, bool master)
5358 int ret = __netdev_adjacent_dev_link(dev, upper_dev, 1);
5363 ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, 1,
5364 &dev->adj_list.upper,
5365 &upper_dev->adj_list.lower,
5368 __netdev_adjacent_dev_unlink(dev, upper_dev, 1);
5375 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
5376 struct net_device *upper_dev)
5378 __netdev_adjacent_dev_unlink(dev, upper_dev, 1);
5379 __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1,
5380 &dev->adj_list.upper,
5381 &upper_dev->adj_list.lower);
5384 static int __netdev_upper_dev_link(struct net_device *dev,
5385 struct net_device *upper_dev, bool master,
5388 struct netdev_notifier_changeupper_info changeupper_info;
5389 struct netdev_adjacent *i, *j, *to_i, *to_j;
5394 if (dev == upper_dev)
5397 /* To prevent loops, check if dev is not upper device to upper_dev. */
5398 if (__netdev_find_adj(dev, &upper_dev->all_adj_list.upper))
5401 if (__netdev_find_adj(upper_dev, &dev->adj_list.upper))
5404 if (master && netdev_master_upper_dev_get(dev))
5407 changeupper_info.upper_dev = upper_dev;
5408 changeupper_info.master = master;
5409 changeupper_info.linking = true;
5411 ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
5412 &changeupper_info.info);
5413 ret = notifier_to_errno(ret);
5417 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private,
5422 /* Now that we linked these devs, make all the upper_dev's
5423 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5424 * versa, and don't forget the devices itself. All of these
5425 * links are non-neighbours.
5427 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5428 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5429 pr_debug("Interlinking %s with %s, non-neighbour\n",
5430 i->dev->name, j->dev->name);
5431 ret = __netdev_adjacent_dev_link(i->dev, j->dev, i->ref_nr);
5437 /* add dev to every upper_dev's upper device */
5438 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5439 pr_debug("linking %s's upper device %s with %s\n",
5440 upper_dev->name, i->dev->name, dev->name);
5441 ret = __netdev_adjacent_dev_link(dev, i->dev, i->ref_nr);
5443 goto rollback_upper_mesh;
5446 /* add upper_dev to every dev's lower device */
5447 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5448 pr_debug("linking %s's lower device %s with %s\n", dev->name,
5449 i->dev->name, upper_dev->name);
5450 ret = __netdev_adjacent_dev_link(i->dev, upper_dev, i->ref_nr);
5452 goto rollback_lower_mesh;
5455 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5456 &changeupper_info.info);
5459 rollback_lower_mesh:
5461 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5464 __netdev_adjacent_dev_unlink(i->dev, upper_dev, i->ref_nr);
5469 rollback_upper_mesh:
5471 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5474 __netdev_adjacent_dev_unlink(dev, i->dev, i->ref_nr);
5482 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5483 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5484 if (i == to_i && j == to_j)
5486 __netdev_adjacent_dev_unlink(i->dev, j->dev, i->ref_nr);
5492 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5498 * netdev_upper_dev_link - Add a link to the upper device
5500 * @upper_dev: new upper device
5502 * Adds a link to device which is upper to this one. The caller must hold
5503 * the RTNL lock. On a failure a negative errno code is returned.
5504 * On success the reference counts are adjusted and the function
5507 int netdev_upper_dev_link(struct net_device *dev,
5508 struct net_device *upper_dev)
5510 return __netdev_upper_dev_link(dev, upper_dev, false, NULL);
5512 EXPORT_SYMBOL(netdev_upper_dev_link);
5515 * netdev_master_upper_dev_link - Add a master link to the upper device
5517 * @upper_dev: new upper device
5519 * Adds a link to device which is upper to this one. In this case, only
5520 * one master upper device can be linked, although other non-master devices
5521 * might be linked as well. The caller must hold the RTNL lock.
5522 * On a failure a negative errno code is returned. On success the reference
5523 * counts are adjusted and the function returns zero.
5525 int netdev_master_upper_dev_link(struct net_device *dev,
5526 struct net_device *upper_dev)
5528 return __netdev_upper_dev_link(dev, upper_dev, true, NULL);
5530 EXPORT_SYMBOL(netdev_master_upper_dev_link);
5532 int netdev_master_upper_dev_link_private(struct net_device *dev,
5533 struct net_device *upper_dev,
5536 return __netdev_upper_dev_link(dev, upper_dev, true, private);
5538 EXPORT_SYMBOL(netdev_master_upper_dev_link_private);
5541 * netdev_upper_dev_unlink - Removes a link to upper device
5543 * @upper_dev: new upper device
5545 * Removes a link to device which is upper to this one. The caller must hold
5548 void netdev_upper_dev_unlink(struct net_device *dev,
5549 struct net_device *upper_dev)
5551 struct netdev_notifier_changeupper_info changeupper_info;
5552 struct netdev_adjacent *i, *j;
5555 changeupper_info.upper_dev = upper_dev;
5556 changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
5557 changeupper_info.linking = false;
5559 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
5560 &changeupper_info.info);
5562 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5564 /* Here is the tricky part. We must remove all dev's lower
5565 * devices from all upper_dev's upper devices and vice
5566 * versa, to maintain the graph relationship.
5568 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5569 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list)
5570 __netdev_adjacent_dev_unlink(i->dev, j->dev, i->ref_nr);
5572 /* remove also the devices itself from lower/upper device
5575 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5576 __netdev_adjacent_dev_unlink(i->dev, upper_dev, i->ref_nr);
5578 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
5579 __netdev_adjacent_dev_unlink(dev, i->dev, i->ref_nr);
5581 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5582 &changeupper_info.info);
5584 EXPORT_SYMBOL(netdev_upper_dev_unlink);
5587 * netdev_bonding_info_change - Dispatch event about slave change
5589 * @bonding_info: info to dispatch
5591 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5592 * The caller must hold the RTNL lock.
5594 void netdev_bonding_info_change(struct net_device *dev,
5595 struct netdev_bonding_info *bonding_info)
5597 struct netdev_notifier_bonding_info info;
5599 memcpy(&info.bonding_info, bonding_info,
5600 sizeof(struct netdev_bonding_info));
5601 call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev,
5604 EXPORT_SYMBOL(netdev_bonding_info_change);
5606 static void netdev_adjacent_add_links(struct net_device *dev)
5608 struct netdev_adjacent *iter;
5610 struct net *net = dev_net(dev);
5612 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5613 if (!net_eq(net,dev_net(iter->dev)))
5615 netdev_adjacent_sysfs_add(iter->dev, dev,
5616 &iter->dev->adj_list.lower);
5617 netdev_adjacent_sysfs_add(dev, iter->dev,
5618 &dev->adj_list.upper);
5621 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5622 if (!net_eq(net,dev_net(iter->dev)))
5624 netdev_adjacent_sysfs_add(iter->dev, dev,
5625 &iter->dev->adj_list.upper);
5626 netdev_adjacent_sysfs_add(dev, iter->dev,
5627 &dev->adj_list.lower);
5631 static void netdev_adjacent_del_links(struct net_device *dev)
5633 struct netdev_adjacent *iter;
5635 struct net *net = dev_net(dev);
5637 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5638 if (!net_eq(net,dev_net(iter->dev)))
5640 netdev_adjacent_sysfs_del(iter->dev, dev->name,
5641 &iter->dev->adj_list.lower);
5642 netdev_adjacent_sysfs_del(dev, iter->dev->name,
5643 &dev->adj_list.upper);
5646 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5647 if (!net_eq(net,dev_net(iter->dev)))
5649 netdev_adjacent_sysfs_del(iter->dev, dev->name,
5650 &iter->dev->adj_list.upper);
5651 netdev_adjacent_sysfs_del(dev, iter->dev->name,
5652 &dev->adj_list.lower);
5656 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
5658 struct netdev_adjacent *iter;
5660 struct net *net = dev_net(dev);
5662 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5663 if (!net_eq(net,dev_net(iter->dev)))
5665 netdev_adjacent_sysfs_del(iter->dev, oldname,
5666 &iter->dev->adj_list.lower);
5667 netdev_adjacent_sysfs_add(iter->dev, dev,
5668 &iter->dev->adj_list.lower);
5671 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5672 if (!net_eq(net,dev_net(iter->dev)))
5674 netdev_adjacent_sysfs_del(iter->dev, oldname,
5675 &iter->dev->adj_list.upper);
5676 netdev_adjacent_sysfs_add(iter->dev, dev,
5677 &iter->dev->adj_list.upper);
5681 void *netdev_lower_dev_get_private(struct net_device *dev,
5682 struct net_device *lower_dev)
5684 struct netdev_adjacent *lower;
5688 lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
5692 return lower->private;
5694 EXPORT_SYMBOL(netdev_lower_dev_get_private);
5697 int dev_get_nest_level(struct net_device *dev,
5698 bool (*type_check)(struct net_device *dev))
5700 struct net_device *lower = NULL;
5701 struct list_head *iter;
5707 netdev_for_each_lower_dev(dev, lower, iter) {
5708 nest = dev_get_nest_level(lower, type_check);
5709 if (max_nest < nest)
5713 if (type_check(dev))
5718 EXPORT_SYMBOL(dev_get_nest_level);
5720 static void dev_change_rx_flags(struct net_device *dev, int flags)
5722 const struct net_device_ops *ops = dev->netdev_ops;
5724 if (ops->ndo_change_rx_flags)
5725 ops->ndo_change_rx_flags(dev, flags);
5728 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
5730 unsigned int old_flags = dev->flags;
5736 dev->flags |= IFF_PROMISC;
5737 dev->promiscuity += inc;
5738 if (dev->promiscuity == 0) {
5741 * If inc causes overflow, untouch promisc and return error.
5744 dev->flags &= ~IFF_PROMISC;
5746 dev->promiscuity -= inc;
5747 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
5752 if (dev->flags != old_flags) {
5753 pr_info("device %s %s promiscuous mode\n",
5755 dev->flags & IFF_PROMISC ? "entered" : "left");
5756 if (audit_enabled) {
5757 current_uid_gid(&uid, &gid);
5758 audit_log(current->audit_context, GFP_ATOMIC,
5759 AUDIT_ANOM_PROMISCUOUS,
5760 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
5761 dev->name, (dev->flags & IFF_PROMISC),
5762 (old_flags & IFF_PROMISC),
5763 from_kuid(&init_user_ns, audit_get_loginuid(current)),
5764 from_kuid(&init_user_ns, uid),
5765 from_kgid(&init_user_ns, gid),
5766 audit_get_sessionid(current));
5769 dev_change_rx_flags(dev, IFF_PROMISC);
5772 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
5777 * dev_set_promiscuity - update promiscuity count on a device
5781 * Add or remove promiscuity from a device. While the count in the device
5782 * remains above zero the interface remains promiscuous. Once it hits zero
5783 * the device reverts back to normal filtering operation. A negative inc
5784 * value is used to drop promiscuity on the device.
5785 * Return 0 if successful or a negative errno code on error.
5787 int dev_set_promiscuity(struct net_device *dev, int inc)
5789 unsigned int old_flags = dev->flags;
5792 err = __dev_set_promiscuity(dev, inc, true);
5795 if (dev->flags != old_flags)
5796 dev_set_rx_mode(dev);
5799 EXPORT_SYMBOL(dev_set_promiscuity);
5801 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
5803 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
5807 dev->flags |= IFF_ALLMULTI;
5808 dev->allmulti += inc;
5809 if (dev->allmulti == 0) {
5812 * If inc causes overflow, untouch allmulti and return error.
5815 dev->flags &= ~IFF_ALLMULTI;
5817 dev->allmulti -= inc;
5818 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
5823 if (dev->flags ^ old_flags) {
5824 dev_change_rx_flags(dev, IFF_ALLMULTI);
5825 dev_set_rx_mode(dev);
5827 __dev_notify_flags(dev, old_flags,
5828 dev->gflags ^ old_gflags);
5834 * dev_set_allmulti - update allmulti count on a device
5838 * Add or remove reception of all multicast frames to a device. While the
5839 * count in the device remains above zero the interface remains listening
5840 * to all interfaces. Once it hits zero the device reverts back to normal
5841 * filtering operation. A negative @inc value is used to drop the counter
5842 * when releasing a resource needing all multicasts.
5843 * Return 0 if successful or a negative errno code on error.
5846 int dev_set_allmulti(struct net_device *dev, int inc)
5848 return __dev_set_allmulti(dev, inc, true);
5850 EXPORT_SYMBOL(dev_set_allmulti);
5853 * Upload unicast and multicast address lists to device and
5854 * configure RX filtering. When the device doesn't support unicast
5855 * filtering it is put in promiscuous mode while unicast addresses
5858 void __dev_set_rx_mode(struct net_device *dev)
5860 const struct net_device_ops *ops = dev->netdev_ops;
5862 /* dev_open will call this function so the list will stay sane. */
5863 if (!(dev->flags&IFF_UP))
5866 if (!netif_device_present(dev))
5869 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
5870 /* Unicast addresses changes may only happen under the rtnl,
5871 * therefore calling __dev_set_promiscuity here is safe.
5873 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
5874 __dev_set_promiscuity(dev, 1, false);
5875 dev->uc_promisc = true;
5876 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
5877 __dev_set_promiscuity(dev, -1, false);
5878 dev->uc_promisc = false;
5882 if (ops->ndo_set_rx_mode)
5883 ops->ndo_set_rx_mode(dev);
5886 void dev_set_rx_mode(struct net_device *dev)
5888 netif_addr_lock_bh(dev);
5889 __dev_set_rx_mode(dev);
5890 netif_addr_unlock_bh(dev);
5894 * dev_get_flags - get flags reported to userspace
5897 * Get the combination of flag bits exported through APIs to userspace.
5899 unsigned int dev_get_flags(const struct net_device *dev)
5903 flags = (dev->flags & ~(IFF_PROMISC |
5908 (dev->gflags & (IFF_PROMISC |
5911 if (netif_running(dev)) {
5912 if (netif_oper_up(dev))
5913 flags |= IFF_RUNNING;
5914 if (netif_carrier_ok(dev))
5915 flags |= IFF_LOWER_UP;
5916 if (netif_dormant(dev))
5917 flags |= IFF_DORMANT;
5922 EXPORT_SYMBOL(dev_get_flags);
5924 int __dev_change_flags(struct net_device *dev, unsigned int flags)
5926 unsigned int old_flags = dev->flags;
5932 * Set the flags on our device.
5935 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
5936 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
5938 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
5942 * Load in the correct multicast list now the flags have changed.
5945 if ((old_flags ^ flags) & IFF_MULTICAST)
5946 dev_change_rx_flags(dev, IFF_MULTICAST);
5948 dev_set_rx_mode(dev);
5951 * Have we downed the interface. We handle IFF_UP ourselves
5952 * according to user attempts to set it, rather than blindly
5957 if ((old_flags ^ flags) & IFF_UP)
5958 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
5960 if ((flags ^ dev->gflags) & IFF_PROMISC) {
5961 int inc = (flags & IFF_PROMISC) ? 1 : -1;
5962 unsigned int old_flags = dev->flags;
5964 dev->gflags ^= IFF_PROMISC;
5966 if (__dev_set_promiscuity(dev, inc, false) >= 0)
5967 if (dev->flags != old_flags)
5968 dev_set_rx_mode(dev);
5971 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5972 is important. Some (broken) drivers set IFF_PROMISC, when
5973 IFF_ALLMULTI is requested not asking us and not reporting.
5975 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
5976 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
5978 dev->gflags ^= IFF_ALLMULTI;
5979 __dev_set_allmulti(dev, inc, false);
5985 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
5986 unsigned int gchanges)
5988 unsigned int changes = dev->flags ^ old_flags;
5991 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
5993 if (changes & IFF_UP) {
5994 if (dev->flags & IFF_UP)
5995 call_netdevice_notifiers(NETDEV_UP, dev);
5997 call_netdevice_notifiers(NETDEV_DOWN, dev);
6000 if (dev->flags & IFF_UP &&
6001 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
6002 struct netdev_notifier_change_info change_info;
6004 change_info.flags_changed = changes;
6005 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
6011 * dev_change_flags - change device settings
6013 * @flags: device state flags
6015 * Change settings on device based state flags. The flags are
6016 * in the userspace exported format.
6018 int dev_change_flags(struct net_device *dev, unsigned int flags)
6021 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
6023 ret = __dev_change_flags(dev, flags);
6027 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
6028 __dev_notify_flags(dev, old_flags, changes);
6031 EXPORT_SYMBOL(dev_change_flags);
6033 static int __dev_set_mtu(struct net_device *dev, int new_mtu)
6035 const struct net_device_ops *ops = dev->netdev_ops;
6037 if (ops->ndo_change_mtu)
6038 return ops->ndo_change_mtu(dev, new_mtu);
6045 * dev_set_mtu - Change maximum transfer unit
6047 * @new_mtu: new transfer unit
6049 * Change the maximum transfer size of the network device.
6051 int dev_set_mtu(struct net_device *dev, int new_mtu)
6055 if (new_mtu == dev->mtu)
6058 /* MTU must be positive. */
6062 if (!netif_device_present(dev))
6065 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
6066 err = notifier_to_errno(err);
6070 orig_mtu = dev->mtu;
6071 err = __dev_set_mtu(dev, new_mtu);
6074 err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
6075 err = notifier_to_errno(err);
6077 /* setting mtu back and notifying everyone again,
6078 * so that they have a chance to revert changes.
6080 __dev_set_mtu(dev, orig_mtu);
6081 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
6086 EXPORT_SYMBOL(dev_set_mtu);
6089 * dev_set_group - Change group this device belongs to
6091 * @new_group: group this device should belong to
6093 void dev_set_group(struct net_device *dev, int new_group)
6095 dev->group = new_group;
6097 EXPORT_SYMBOL(dev_set_group);
6100 * dev_set_mac_address - Change Media Access Control Address
6104 * Change the hardware (MAC) address of the device
6106 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
6108 const struct net_device_ops *ops = dev->netdev_ops;
6111 if (!ops->ndo_set_mac_address)
6113 if (sa->sa_family != dev->type)
6115 if (!netif_device_present(dev))
6117 err = ops->ndo_set_mac_address(dev, sa);
6120 dev->addr_assign_type = NET_ADDR_SET;
6121 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
6122 add_device_randomness(dev->dev_addr, dev->addr_len);
6125 EXPORT_SYMBOL(dev_set_mac_address);
6128 * dev_change_carrier - Change device carrier
6130 * @new_carrier: new value
6132 * Change device carrier
6134 int dev_change_carrier(struct net_device *dev, bool new_carrier)
6136 const struct net_device_ops *ops = dev->netdev_ops;
6138 if (!ops->ndo_change_carrier)
6140 if (!netif_device_present(dev))
6142 return ops->ndo_change_carrier(dev, new_carrier);
6144 EXPORT_SYMBOL(dev_change_carrier);
6147 * dev_get_phys_port_id - Get device physical port ID
6151 * Get device physical port ID
6153 int dev_get_phys_port_id(struct net_device *dev,
6154 struct netdev_phys_item_id *ppid)
6156 const struct net_device_ops *ops = dev->netdev_ops;
6158 if (!ops->ndo_get_phys_port_id)
6160 return ops->ndo_get_phys_port_id(dev, ppid);
6162 EXPORT_SYMBOL(dev_get_phys_port_id);
6165 * dev_get_phys_port_name - Get device physical port name
6169 * Get device physical port name
6171 int dev_get_phys_port_name(struct net_device *dev,
6172 char *name, size_t len)
6174 const struct net_device_ops *ops = dev->netdev_ops;
6176 if (!ops->ndo_get_phys_port_name)
6178 return ops->ndo_get_phys_port_name(dev, name, len);
6180 EXPORT_SYMBOL(dev_get_phys_port_name);
6183 * dev_change_proto_down - update protocol port state information
6185 * @proto_down: new value
6187 * This info can be used by switch drivers to set the phys state of the
6190 int dev_change_proto_down(struct net_device *dev, bool proto_down)
6192 const struct net_device_ops *ops = dev->netdev_ops;
6194 if (!ops->ndo_change_proto_down)
6196 if (!netif_device_present(dev))
6198 return ops->ndo_change_proto_down(dev, proto_down);
6200 EXPORT_SYMBOL(dev_change_proto_down);
6203 * dev_new_index - allocate an ifindex
6204 * @net: the applicable net namespace
6206 * Returns a suitable unique value for a new device interface
6207 * number. The caller must hold the rtnl semaphore or the
6208 * dev_base_lock to be sure it remains unique.
6210 static int dev_new_index(struct net *net)
6212 int ifindex = net->ifindex;
6216 if (!__dev_get_by_index(net, ifindex))
6217 return net->ifindex = ifindex;
6221 /* Delayed registration/unregisteration */
6222 static LIST_HEAD(net_todo_list);
6223 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
6225 static void net_set_todo(struct net_device *dev)
6227 list_add_tail(&dev->todo_list, &net_todo_list);
6228 dev_net(dev)->dev_unreg_count++;
6231 static void rollback_registered_many(struct list_head *head)
6233 struct net_device *dev, *tmp;
6234 LIST_HEAD(close_head);
6236 BUG_ON(dev_boot_phase);
6239 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
6240 /* Some devices call without registering
6241 * for initialization unwind. Remove those
6242 * devices and proceed with the remaining.
6244 if (dev->reg_state == NETREG_UNINITIALIZED) {
6245 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6249 list_del(&dev->unreg_list);
6252 dev->dismantle = true;
6253 BUG_ON(dev->reg_state != NETREG_REGISTERED);
6256 /* If device is running, close it first. */
6257 list_for_each_entry(dev, head, unreg_list)
6258 list_add_tail(&dev->close_list, &close_head);
6259 dev_close_many(&close_head, true);
6261 list_for_each_entry(dev, head, unreg_list) {
6262 /* And unlink it from device chain. */
6263 unlist_netdevice(dev);
6265 dev->reg_state = NETREG_UNREGISTERING;
6266 on_each_cpu(flush_backlog, dev, 1);
6271 list_for_each_entry(dev, head, unreg_list) {
6272 struct sk_buff *skb = NULL;
6274 /* Shutdown queueing discipline. */
6278 /* Notify protocols, that we are about to destroy
6279 this device. They should clean all the things.
6281 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6283 if (!dev->rtnl_link_ops ||
6284 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6285 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U,
6289 * Flush the unicast and multicast chains
6294 if (dev->netdev_ops->ndo_uninit)
6295 dev->netdev_ops->ndo_uninit(dev);
6298 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);
6300 /* Notifier chain MUST detach us all upper devices. */
6301 WARN_ON(netdev_has_any_upper_dev(dev));
6303 /* Remove entries from kobject tree */
6304 netdev_unregister_kobject(dev);
6306 /* Remove XPS queueing entries */
6307 netif_reset_xps_queues_gt(dev, 0);
6313 list_for_each_entry(dev, head, unreg_list)
6317 static void rollback_registered(struct net_device *dev)
6321 list_add(&dev->unreg_list, &single);
6322 rollback_registered_many(&single);
6326 static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
6327 struct net_device *upper, netdev_features_t features)
6329 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
6330 netdev_features_t feature;
6333 for_each_netdev_feature(&upper_disables, feature_bit) {
6334 feature = __NETIF_F_BIT(feature_bit);
6335 if (!(upper->wanted_features & feature)
6336 && (features & feature)) {
6337 netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
6338 &feature, upper->name);
6339 features &= ~feature;
6346 static void netdev_sync_lower_features(struct net_device *upper,
6347 struct net_device *lower, netdev_features_t features)
6349 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
6350 netdev_features_t feature;
6353 for_each_netdev_feature(&upper_disables, feature_bit) {
6354 feature = __NETIF_F_BIT(feature_bit);
6355 if (!(features & feature) && (lower->features & feature)) {
6356 netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
6357 &feature, lower->name);
6358 lower->wanted_features &= ~feature;
6359 netdev_update_features(lower);
6361 if (unlikely(lower->features & feature))
6362 netdev_WARN(upper, "failed to disable %pNF on %s!\n",
6363 &feature, lower->name);
6368 static netdev_features_t netdev_fix_features(struct net_device *dev,
6369 netdev_features_t features)
6371 /* Fix illegal checksum combinations */
6372 if ((features & NETIF_F_HW_CSUM) &&
6373 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
6374 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
6375 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
6378 /* TSO requires that SG is present as well. */
6379 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
6380 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
6381 features &= ~NETIF_F_ALL_TSO;
6384 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
6385 !(features & NETIF_F_IP_CSUM)) {
6386 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
6387 features &= ~NETIF_F_TSO;
6388 features &= ~NETIF_F_TSO_ECN;
6391 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
6392 !(features & NETIF_F_IPV6_CSUM)) {
6393 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
6394 features &= ~NETIF_F_TSO6;
6397 /* TSO ECN requires that TSO is present as well. */
6398 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
6399 features &= ~NETIF_F_TSO_ECN;
6401 /* Software GSO depends on SG. */
6402 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
6403 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
6404 features &= ~NETIF_F_GSO;
6407 /* UFO needs SG and checksumming */
6408 if (features & NETIF_F_UFO) {
6409 /* maybe split UFO into V4 and V6? */
6410 if (!((features & NETIF_F_GEN_CSUM) ||
6411 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
6412 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
6414 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6415 features &= ~NETIF_F_UFO;
6418 if (!(features & NETIF_F_SG)) {
6420 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6421 features &= ~NETIF_F_UFO;
6425 #ifdef CONFIG_NET_RX_BUSY_POLL
6426 if (dev->netdev_ops->ndo_busy_poll)
6427 features |= NETIF_F_BUSY_POLL;
6430 features &= ~NETIF_F_BUSY_POLL;
6435 int __netdev_update_features(struct net_device *dev)
6437 struct net_device *upper, *lower;
6438 netdev_features_t features;
6439 struct list_head *iter;
6444 features = netdev_get_wanted_features(dev);
6446 if (dev->netdev_ops->ndo_fix_features)
6447 features = dev->netdev_ops->ndo_fix_features(dev, features);
6449 /* driver might be less strict about feature dependencies */
6450 features = netdev_fix_features(dev, features);
6452 /* some features can't be enabled if they're off an an upper device */
6453 netdev_for_each_upper_dev_rcu(dev, upper, iter)
6454 features = netdev_sync_upper_features(dev, upper, features);
6456 if (dev->features == features)
6459 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
6460 &dev->features, &features);
6462 if (dev->netdev_ops->ndo_set_features)
6463 err = dev->netdev_ops->ndo_set_features(dev, features);
6467 if (unlikely(err < 0)) {
6469 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6470 err, &features, &dev->features);
6471 /* return non-0 since some features might have changed and
6472 * it's better to fire a spurious notification than miss it
6478 /* some features must be disabled on lower devices when disabled
6479 * on an upper device (think: bonding master or bridge)
6481 netdev_for_each_lower_dev(dev, lower, iter)
6482 netdev_sync_lower_features(dev, lower, features);
6485 dev->features = features;
6487 return err < 0 ? 0 : 1;
6491 * netdev_update_features - recalculate device features
6492 * @dev: the device to check
6494 * Recalculate dev->features set and send notifications if it
6495 * has changed. Should be called after driver or hardware dependent
6496 * conditions might have changed that influence the features.
6498 void netdev_update_features(struct net_device *dev)
6500 if (__netdev_update_features(dev))
6501 netdev_features_change(dev);
6503 EXPORT_SYMBOL(netdev_update_features);
6506 * netdev_change_features - recalculate device features
6507 * @dev: the device to check
6509 * Recalculate dev->features set and send notifications even
6510 * if they have not changed. Should be called instead of
6511 * netdev_update_features() if also dev->vlan_features might
6512 * have changed to allow the changes to be propagated to stacked
6515 void netdev_change_features(struct net_device *dev)
6517 __netdev_update_features(dev);
6518 netdev_features_change(dev);
6520 EXPORT_SYMBOL(netdev_change_features);
6523 * netif_stacked_transfer_operstate - transfer operstate
6524 * @rootdev: the root or lower level device to transfer state from
6525 * @dev: the device to transfer operstate to
6527 * Transfer operational state from root to device. This is normally
6528 * called when a stacking relationship exists between the root
6529 * device and the device(a leaf device).
6531 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
6532 struct net_device *dev)
6534 if (rootdev->operstate == IF_OPER_DORMANT)
6535 netif_dormant_on(dev);
6537 netif_dormant_off(dev);
6539 if (netif_carrier_ok(rootdev)) {
6540 if (!netif_carrier_ok(dev))
6541 netif_carrier_on(dev);
6543 if (netif_carrier_ok(dev))
6544 netif_carrier_off(dev);
6547 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
6550 static int netif_alloc_rx_queues(struct net_device *dev)
6552 unsigned int i, count = dev->num_rx_queues;
6553 struct netdev_rx_queue *rx;
6554 size_t sz = count * sizeof(*rx);
6558 rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6566 for (i = 0; i < count; i++)
6572 static void netdev_init_one_queue(struct net_device *dev,
6573 struct netdev_queue *queue, void *_unused)
6575 /* Initialize queue lock */
6576 spin_lock_init(&queue->_xmit_lock);
6577 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
6578 queue->xmit_lock_owner = -1;
6579 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
6582 dql_init(&queue->dql, HZ);
6586 static void netif_free_tx_queues(struct net_device *dev)
6591 static int netif_alloc_netdev_queues(struct net_device *dev)
6593 unsigned int count = dev->num_tx_queues;
6594 struct netdev_queue *tx;
6595 size_t sz = count * sizeof(*tx);
6597 if (count < 1 || count > 0xffff)
6600 tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6608 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
6609 spin_lock_init(&dev->tx_global_lock);
6614 void netif_tx_stop_all_queues(struct net_device *dev)
6618 for (i = 0; i < dev->num_tx_queues; i++) {
6619 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
6620 netif_tx_stop_queue(txq);
6623 EXPORT_SYMBOL(netif_tx_stop_all_queues);
6626 * register_netdevice - register a network device
6627 * @dev: device to register
6629 * Take a completed network device structure and add it to the kernel
6630 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6631 * chain. 0 is returned on success. A negative errno code is returned
6632 * on a failure to set up the device, or if the name is a duplicate.
6634 * Callers must hold the rtnl semaphore. You may want
6635 * register_netdev() instead of this.
6638 * The locking appears insufficient to guarantee two parallel registers
6639 * will not get the same name.
6642 int register_netdevice(struct net_device *dev)
6645 struct net *net = dev_net(dev);
6647 BUG_ON(dev_boot_phase);
6652 /* When net_device's are persistent, this will be fatal. */
6653 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
6656 spin_lock_init(&dev->addr_list_lock);
6657 netdev_set_addr_lockdep_class(dev);
6659 ret = dev_get_valid_name(net, dev, dev->name);
6663 /* Init, if this function is available */
6664 if (dev->netdev_ops->ndo_init) {
6665 ret = dev->netdev_ops->ndo_init(dev);
6673 if (((dev->hw_features | dev->features) &
6674 NETIF_F_HW_VLAN_CTAG_FILTER) &&
6675 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
6676 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
6677 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
6684 dev->ifindex = dev_new_index(net);
6685 else if (__dev_get_by_index(net, dev->ifindex))
6688 /* Transfer changeable features to wanted_features and enable
6689 * software offloads (GSO and GRO).
6691 dev->hw_features |= NETIF_F_SOFT_FEATURES;
6692 dev->features |= NETIF_F_SOFT_FEATURES;
6693 dev->wanted_features = dev->features & dev->hw_features;
6695 if (!(dev->flags & IFF_LOOPBACK)) {
6696 dev->hw_features |= NETIF_F_NOCACHE_COPY;
6699 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
6701 dev->vlan_features |= NETIF_F_HIGHDMA;
6703 /* Make NETIF_F_SG inheritable to tunnel devices.
6705 dev->hw_enc_features |= NETIF_F_SG;
6707 /* Make NETIF_F_SG inheritable to MPLS.
6709 dev->mpls_features |= NETIF_F_SG;
6711 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
6712 ret = notifier_to_errno(ret);
6716 ret = netdev_register_kobject(dev);
6719 dev->reg_state = NETREG_REGISTERED;
6721 __netdev_update_features(dev);
6724 * Default initial state at registry is that the
6725 * device is present.
6728 set_bit(__LINK_STATE_PRESENT, &dev->state);
6730 linkwatch_init_dev(dev);
6732 dev_init_scheduler(dev);
6734 list_netdevice(dev);
6735 add_device_randomness(dev->dev_addr, dev->addr_len);
6737 /* If the device has permanent device address, driver should
6738 * set dev_addr and also addr_assign_type should be set to
6739 * NET_ADDR_PERM (default value).
6741 if (dev->addr_assign_type == NET_ADDR_PERM)
6742 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
6744 /* Notify protocols, that a new device appeared. */
6745 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
6746 ret = notifier_to_errno(ret);
6748 rollback_registered(dev);
6749 dev->reg_state = NETREG_UNREGISTERED;
6752 * Prevent userspace races by waiting until the network
6753 * device is fully setup before sending notifications.
6755 if (!dev->rtnl_link_ops ||
6756 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6757 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
6763 if (dev->netdev_ops->ndo_uninit)
6764 dev->netdev_ops->ndo_uninit(dev);
6767 EXPORT_SYMBOL(register_netdevice);
6770 * init_dummy_netdev - init a dummy network device for NAPI
6771 * @dev: device to init
6773 * This takes a network device structure and initialize the minimum
6774 * amount of fields so it can be used to schedule NAPI polls without
6775 * registering a full blown interface. This is to be used by drivers
6776 * that need to tie several hardware interfaces to a single NAPI
6777 * poll scheduler due to HW limitations.
6779 int init_dummy_netdev(struct net_device *dev)
6781 /* Clear everything. Note we don't initialize spinlocks
6782 * are they aren't supposed to be taken by any of the
6783 * NAPI code and this dummy netdev is supposed to be
6784 * only ever used for NAPI polls
6786 memset(dev, 0, sizeof(struct net_device));
6788 /* make sure we BUG if trying to hit standard
6789 * register/unregister code path
6791 dev->reg_state = NETREG_DUMMY;
6793 /* NAPI wants this */
6794 INIT_LIST_HEAD(&dev->napi_list);
6796 /* a dummy interface is started by default */
6797 set_bit(__LINK_STATE_PRESENT, &dev->state);
6798 set_bit(__LINK_STATE_START, &dev->state);
6800 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6801 * because users of this 'device' dont need to change
6807 EXPORT_SYMBOL_GPL(init_dummy_netdev);
6811 * register_netdev - register a network device
6812 * @dev: device to register
6814 * Take a completed network device structure and add it to the kernel
6815 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6816 * chain. 0 is returned on success. A negative errno code is returned
6817 * on a failure to set up the device, or if the name is a duplicate.
6819 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6820 * and expands the device name if you passed a format string to
6823 int register_netdev(struct net_device *dev)
6828 err = register_netdevice(dev);
6832 EXPORT_SYMBOL(register_netdev);
6834 int netdev_refcnt_read(const struct net_device *dev)
6838 for_each_possible_cpu(i)
6839 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
6842 EXPORT_SYMBOL(netdev_refcnt_read);
6845 * netdev_wait_allrefs - wait until all references are gone.
6846 * @dev: target net_device
6848 * This is called when unregistering network devices.
6850 * Any protocol or device that holds a reference should register
6851 * for netdevice notification, and cleanup and put back the
6852 * reference if they receive an UNREGISTER event.
6853 * We can get stuck here if buggy protocols don't correctly
6856 static void netdev_wait_allrefs(struct net_device *dev)
6858 unsigned long rebroadcast_time, warning_time;
6861 linkwatch_forget_dev(dev);
6863 rebroadcast_time = warning_time = jiffies;
6864 refcnt = netdev_refcnt_read(dev);
6866 while (refcnt != 0) {
6867 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
6870 /* Rebroadcast unregister notification */
6871 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6877 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6878 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
6880 /* We must not have linkwatch events
6881 * pending on unregister. If this
6882 * happens, we simply run the queue
6883 * unscheduled, resulting in a noop
6886 linkwatch_run_queue();
6891 rebroadcast_time = jiffies;
6896 refcnt = netdev_refcnt_read(dev);
6898 if (time_after(jiffies, warning_time + 10 * HZ)) {
6899 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6901 warning_time = jiffies;
6910 * register_netdevice(x1);
6911 * register_netdevice(x2);
6913 * unregister_netdevice(y1);
6914 * unregister_netdevice(y2);
6920 * We are invoked by rtnl_unlock().
6921 * This allows us to deal with problems:
6922 * 1) We can delete sysfs objects which invoke hotplug
6923 * without deadlocking with linkwatch via keventd.
6924 * 2) Since we run with the RTNL semaphore not held, we can sleep
6925 * safely in order to wait for the netdev refcnt to drop to zero.
6927 * We must not return until all unregister events added during
6928 * the interval the lock was held have been completed.
6930 void netdev_run_todo(void)
6932 struct list_head list;
6934 /* Snapshot list, allow later requests */
6935 list_replace_init(&net_todo_list, &list);
6940 /* Wait for rcu callbacks to finish before next phase */
6941 if (!list_empty(&list))
6944 while (!list_empty(&list)) {
6945 struct net_device *dev
6946 = list_first_entry(&list, struct net_device, todo_list);
6947 list_del(&dev->todo_list);
6950 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6953 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
6954 pr_err("network todo '%s' but state %d\n",
6955 dev->name, dev->reg_state);
6960 dev->reg_state = NETREG_UNREGISTERED;
6962 netdev_wait_allrefs(dev);
6965 BUG_ON(netdev_refcnt_read(dev));
6966 BUG_ON(!list_empty(&dev->ptype_all));
6967 BUG_ON(!list_empty(&dev->ptype_specific));
6968 WARN_ON(rcu_access_pointer(dev->ip_ptr));
6969 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
6970 WARN_ON(dev->dn_ptr);
6972 if (dev->destructor)
6973 dev->destructor(dev);
6975 /* Report a network device has been unregistered */
6977 dev_net(dev)->dev_unreg_count--;
6979 wake_up(&netdev_unregistering_wq);
6981 /* Free network device */
6982 kobject_put(&dev->dev.kobj);
6986 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6987 * fields in the same order, with only the type differing.
6989 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
6990 const struct net_device_stats *netdev_stats)
6992 #if BITS_PER_LONG == 64
6993 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
6994 memcpy(stats64, netdev_stats, sizeof(*stats64));
6996 size_t i, n = sizeof(*stats64) / sizeof(u64);
6997 const unsigned long *src = (const unsigned long *)netdev_stats;
6998 u64 *dst = (u64 *)stats64;
7000 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
7001 sizeof(*stats64) / sizeof(u64));
7002 for (i = 0; i < n; i++)
7006 EXPORT_SYMBOL(netdev_stats_to_stats64);
7009 * dev_get_stats - get network device statistics
7010 * @dev: device to get statistics from
7011 * @storage: place to store stats
7013 * Get network statistics from device. Return @storage.
7014 * The device driver may provide its own method by setting
7015 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
7016 * otherwise the internal statistics structure is used.
7018 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
7019 struct rtnl_link_stats64 *storage)
7021 const struct net_device_ops *ops = dev->netdev_ops;
7023 if (ops->ndo_get_stats64) {
7024 memset(storage, 0, sizeof(*storage));
7025 ops->ndo_get_stats64(dev, storage);
7026 } else if (ops->ndo_get_stats) {
7027 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
7029 netdev_stats_to_stats64(storage, &dev->stats);
7031 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
7032 storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
7035 EXPORT_SYMBOL(dev_get_stats);
7037 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
7039 struct netdev_queue *queue = dev_ingress_queue(dev);
7041 #ifdef CONFIG_NET_CLS_ACT
7044 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
7047 netdev_init_one_queue(dev, queue, NULL);
7048 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
7049 queue->qdisc_sleeping = &noop_qdisc;
7050 rcu_assign_pointer(dev->ingress_queue, queue);
7055 static const struct ethtool_ops default_ethtool_ops;
7057 void netdev_set_default_ethtool_ops(struct net_device *dev,
7058 const struct ethtool_ops *ops)
7060 if (dev->ethtool_ops == &default_ethtool_ops)
7061 dev->ethtool_ops = ops;
7063 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
7065 void netdev_freemem(struct net_device *dev)
7067 char *addr = (char *)dev - dev->padded;
7073 * alloc_netdev_mqs - allocate network device
7074 * @sizeof_priv: size of private data to allocate space for
7075 * @name: device name format string
7076 * @name_assign_type: origin of device name
7077 * @setup: callback to initialize device
7078 * @txqs: the number of TX subqueues to allocate
7079 * @rxqs: the number of RX subqueues to allocate
7081 * Allocates a struct net_device with private data area for driver use
7082 * and performs basic initialization. Also allocates subqueue structs
7083 * for each queue on the device.
7085 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
7086 unsigned char name_assign_type,
7087 void (*setup)(struct net_device *),
7088 unsigned int txqs, unsigned int rxqs)
7090 struct net_device *dev;
7092 struct net_device *p;
7094 BUG_ON(strlen(name) >= sizeof(dev->name));
7097 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
7103 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
7108 alloc_size = sizeof(struct net_device);
7110 /* ensure 32-byte alignment of private area */
7111 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
7112 alloc_size += sizeof_priv;
7114 /* ensure 32-byte alignment of whole construct */
7115 alloc_size += NETDEV_ALIGN - 1;
7117 p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
7119 p = vzalloc(alloc_size);
7123 dev = PTR_ALIGN(p, NETDEV_ALIGN);
7124 dev->padded = (char *)dev - (char *)p;
7126 dev->pcpu_refcnt = alloc_percpu(int);
7127 if (!dev->pcpu_refcnt)
7130 if (dev_addr_init(dev))
7136 dev_net_set(dev, &init_net);
7138 dev->gso_max_size = GSO_MAX_SIZE;
7139 dev->gso_max_segs = GSO_MAX_SEGS;
7140 dev->gso_min_segs = 0;
7142 INIT_LIST_HEAD(&dev->napi_list);
7143 INIT_LIST_HEAD(&dev->unreg_list);
7144 INIT_LIST_HEAD(&dev->close_list);
7145 INIT_LIST_HEAD(&dev->link_watch_list);
7146 INIT_LIST_HEAD(&dev->adj_list.upper);
7147 INIT_LIST_HEAD(&dev->adj_list.lower);
7148 INIT_LIST_HEAD(&dev->all_adj_list.upper);
7149 INIT_LIST_HEAD(&dev->all_adj_list.lower);
7150 INIT_LIST_HEAD(&dev->ptype_all);
7151 INIT_LIST_HEAD(&dev->ptype_specific);
7152 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
7155 if (!dev->tx_queue_len) {
7156 dev->priv_flags |= IFF_NO_QUEUE;
7157 dev->tx_queue_len = 1;
7160 dev->num_tx_queues = txqs;
7161 dev->real_num_tx_queues = txqs;
7162 if (netif_alloc_netdev_queues(dev))
7166 dev->num_rx_queues = rxqs;
7167 dev->real_num_rx_queues = rxqs;
7168 if (netif_alloc_rx_queues(dev))
7172 strcpy(dev->name, name);
7173 dev->name_assign_type = name_assign_type;
7174 dev->group = INIT_NETDEV_GROUP;
7175 if (!dev->ethtool_ops)
7176 dev->ethtool_ops = &default_ethtool_ops;
7178 nf_hook_ingress_init(dev);
7187 free_percpu(dev->pcpu_refcnt);
7189 netdev_freemem(dev);
7192 EXPORT_SYMBOL(alloc_netdev_mqs);
7195 * free_netdev - free network device
7198 * This function does the last stage of destroying an allocated device
7199 * interface. The reference to the device object is released.
7200 * If this is the last reference then it will be freed.
7202 void free_netdev(struct net_device *dev)
7204 struct napi_struct *p, *n;
7206 netif_free_tx_queues(dev);
7211 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
7213 /* Flush device addresses */
7214 dev_addr_flush(dev);
7216 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
7219 free_percpu(dev->pcpu_refcnt);
7220 dev->pcpu_refcnt = NULL;
7222 /* Compatibility with error handling in drivers */
7223 if (dev->reg_state == NETREG_UNINITIALIZED) {
7224 netdev_freemem(dev);
7228 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
7229 dev->reg_state = NETREG_RELEASED;
7231 /* will free via device release */
7232 put_device(&dev->dev);
7234 EXPORT_SYMBOL(free_netdev);
7237 * synchronize_net - Synchronize with packet receive processing
7239 * Wait for packets currently being received to be done.
7240 * Does not block later packets from starting.
7242 void synchronize_net(void)
7245 if (rtnl_is_locked())
7246 synchronize_rcu_expedited();
7250 EXPORT_SYMBOL(synchronize_net);
7253 * unregister_netdevice_queue - remove device from the kernel
7257 * This function shuts down a device interface and removes it
7258 * from the kernel tables.
7259 * If head not NULL, device is queued to be unregistered later.
7261 * Callers must hold the rtnl semaphore. You may want
7262 * unregister_netdev() instead of this.
7265 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
7270 list_move_tail(&dev->unreg_list, head);
7272 rollback_registered(dev);
7273 /* Finish processing unregister after unlock */
7277 EXPORT_SYMBOL(unregister_netdevice_queue);
7280 * unregister_netdevice_many - unregister many devices
7281 * @head: list of devices
7283 * Note: As most callers use a stack allocated list_head,
7284 * we force a list_del() to make sure stack wont be corrupted later.
7286 void unregister_netdevice_many(struct list_head *head)
7288 struct net_device *dev;
7290 if (!list_empty(head)) {
7291 rollback_registered_many(head);
7292 list_for_each_entry(dev, head, unreg_list)
7297 EXPORT_SYMBOL(unregister_netdevice_many);
7300 * unregister_netdev - remove device from the kernel
7303 * This function shuts down a device interface and removes it
7304 * from the kernel tables.
7306 * This is just a wrapper for unregister_netdevice that takes
7307 * the rtnl semaphore. In general you want to use this and not
7308 * unregister_netdevice.
7310 void unregister_netdev(struct net_device *dev)
7313 unregister_netdevice(dev);
7316 EXPORT_SYMBOL(unregister_netdev);
7319 * dev_change_net_namespace - move device to different nethost namespace
7321 * @net: network namespace
7322 * @pat: If not NULL name pattern to try if the current device name
7323 * is already taken in the destination network namespace.
7325 * This function shuts down a device interface and moves it
7326 * to a new network namespace. On success 0 is returned, on
7327 * a failure a netagive errno code is returned.
7329 * Callers must hold the rtnl semaphore.
7332 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
7338 /* Don't allow namespace local devices to be moved. */
7340 if (dev->features & NETIF_F_NETNS_LOCAL)
7343 /* Ensure the device has been registrered */
7344 if (dev->reg_state != NETREG_REGISTERED)
7347 /* Get out if there is nothing todo */
7349 if (net_eq(dev_net(dev), net))
7352 /* Pick the destination device name, and ensure
7353 * we can use it in the destination network namespace.
7356 if (__dev_get_by_name(net, dev->name)) {
7357 /* We get here if we can't use the current device name */
7360 if (dev_get_valid_name(net, dev, pat) < 0)
7365 * And now a mini version of register_netdevice unregister_netdevice.
7368 /* If device is running close it first. */
7371 /* And unlink it from device chain */
7373 unlist_netdevice(dev);
7377 /* Shutdown queueing discipline. */
7380 /* Notify protocols, that we are about to destroy
7381 this device. They should clean all the things.
7383 Note that dev->reg_state stays at NETREG_REGISTERED.
7384 This is wanted because this way 8021q and macvlan know
7385 the device is just moving and can keep their slaves up.
7387 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
7389 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7390 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
7393 * Flush the unicast and multicast chains
7398 /* Send a netdev-removed uevent to the old namespace */
7399 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
7400 netdev_adjacent_del_links(dev);
7402 /* Actually switch the network namespace */
7403 dev_net_set(dev, net);
7405 /* If there is an ifindex conflict assign a new one */
7406 if (__dev_get_by_index(net, dev->ifindex))
7407 dev->ifindex = dev_new_index(net);
7409 /* Send a netdev-add uevent to the new namespace */
7410 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
7411 netdev_adjacent_add_links(dev);
7413 /* Fixup kobjects */
7414 err = device_rename(&dev->dev, dev->name);
7417 /* Add the device back in the hashes */
7418 list_netdevice(dev);
7420 /* Notify protocols, that a new device appeared. */
7421 call_netdevice_notifiers(NETDEV_REGISTER, dev);
7424 * Prevent userspace races by waiting until the network
7425 * device is fully setup before sending notifications.
7427 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
7434 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
7436 static int dev_cpu_callback(struct notifier_block *nfb,
7437 unsigned long action,
7440 struct sk_buff **list_skb;
7441 struct sk_buff *skb;
7442 unsigned int cpu, oldcpu = (unsigned long)ocpu;
7443 struct softnet_data *sd, *oldsd;
7445 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
7448 local_irq_disable();
7449 cpu = smp_processor_id();
7450 sd = &per_cpu(softnet_data, cpu);
7451 oldsd = &per_cpu(softnet_data, oldcpu);
7453 /* Find end of our completion_queue. */
7454 list_skb = &sd->completion_queue;
7456 list_skb = &(*list_skb)->next;
7457 /* Append completion queue from offline CPU. */
7458 *list_skb = oldsd->completion_queue;
7459 oldsd->completion_queue = NULL;
7461 /* Append output queue from offline CPU. */
7462 if (oldsd->output_queue) {
7463 *sd->output_queue_tailp = oldsd->output_queue;
7464 sd->output_queue_tailp = oldsd->output_queue_tailp;
7465 oldsd->output_queue = NULL;
7466 oldsd->output_queue_tailp = &oldsd->output_queue;
7468 /* Append NAPI poll list from offline CPU, with one exception :
7469 * process_backlog() must be called by cpu owning percpu backlog.
7470 * We properly handle process_queue & input_pkt_queue later.
7472 while (!list_empty(&oldsd->poll_list)) {
7473 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
7477 list_del_init(&napi->poll_list);
7478 if (napi->poll == process_backlog)
7481 ____napi_schedule(sd, napi);
7484 raise_softirq_irqoff(NET_TX_SOFTIRQ);
7487 /* Process offline CPU's input_pkt_queue */
7488 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
7490 input_queue_head_incr(oldsd);
7492 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
7494 input_queue_head_incr(oldsd);
7502 * netdev_increment_features - increment feature set by one
7503 * @all: current feature set
7504 * @one: new feature set
7505 * @mask: mask feature set
7507 * Computes a new feature set after adding a device with feature set
7508 * @one to the master device with current feature set @all. Will not
7509 * enable anything that is off in @mask. Returns the new feature set.
7511 netdev_features_t netdev_increment_features(netdev_features_t all,
7512 netdev_features_t one, netdev_features_t mask)
7514 if (mask & NETIF_F_GEN_CSUM)
7515 mask |= NETIF_F_ALL_CSUM;
7516 mask |= NETIF_F_VLAN_CHALLENGED;
7518 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
7519 all &= one | ~NETIF_F_ALL_FOR_ALL;
7521 /* If one device supports hw checksumming, set for all. */
7522 if (all & NETIF_F_GEN_CSUM)
7523 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
7527 EXPORT_SYMBOL(netdev_increment_features);
7529 static struct hlist_head * __net_init netdev_create_hash(void)
7532 struct hlist_head *hash;
7534 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
7536 for (i = 0; i < NETDEV_HASHENTRIES; i++)
7537 INIT_HLIST_HEAD(&hash[i]);
7542 /* Initialize per network namespace state */
7543 static int __net_init netdev_init(struct net *net)
7545 if (net != &init_net)
7546 INIT_LIST_HEAD(&net->dev_base_head);
7548 net->dev_name_head = netdev_create_hash();
7549 if (net->dev_name_head == NULL)
7552 net->dev_index_head = netdev_create_hash();
7553 if (net->dev_index_head == NULL)
7559 kfree(net->dev_name_head);
7565 * netdev_drivername - network driver for the device
7566 * @dev: network device
7568 * Determine network driver for device.
7570 const char *netdev_drivername(const struct net_device *dev)
7572 const struct device_driver *driver;
7573 const struct device *parent;
7574 const char *empty = "";
7576 parent = dev->dev.parent;
7580 driver = parent->driver;
7581 if (driver && driver->name)
7582 return driver->name;
7586 static void __netdev_printk(const char *level, const struct net_device *dev,
7587 struct va_format *vaf)
7589 if (dev && dev->dev.parent) {
7590 dev_printk_emit(level[1] - '0',
7593 dev_driver_string(dev->dev.parent),
7594 dev_name(dev->dev.parent),
7595 netdev_name(dev), netdev_reg_state(dev),
7598 printk("%s%s%s: %pV",
7599 level, netdev_name(dev), netdev_reg_state(dev), vaf);
7601 printk("%s(NULL net_device): %pV", level, vaf);
7605 void netdev_printk(const char *level, const struct net_device *dev,
7606 const char *format, ...)
7608 struct va_format vaf;
7611 va_start(args, format);
7616 __netdev_printk(level, dev, &vaf);
7620 EXPORT_SYMBOL(netdev_printk);
7622 #define define_netdev_printk_level(func, level) \
7623 void func(const struct net_device *dev, const char *fmt, ...) \
7625 struct va_format vaf; \
7628 va_start(args, fmt); \
7633 __netdev_printk(level, dev, &vaf); \
7637 EXPORT_SYMBOL(func);
7639 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
7640 define_netdev_printk_level(netdev_alert, KERN_ALERT);
7641 define_netdev_printk_level(netdev_crit, KERN_CRIT);
7642 define_netdev_printk_level(netdev_err, KERN_ERR);
7643 define_netdev_printk_level(netdev_warn, KERN_WARNING);
7644 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
7645 define_netdev_printk_level(netdev_info, KERN_INFO);
7647 static void __net_exit netdev_exit(struct net *net)
7649 kfree(net->dev_name_head);
7650 kfree(net->dev_index_head);
7653 static struct pernet_operations __net_initdata netdev_net_ops = {
7654 .init = netdev_init,
7655 .exit = netdev_exit,
7658 static void __net_exit default_device_exit(struct net *net)
7660 struct net_device *dev, *aux;
7662 * Push all migratable network devices back to the
7663 * initial network namespace
7666 for_each_netdev_safe(net, dev, aux) {
7668 char fb_name[IFNAMSIZ];
7670 /* Ignore unmoveable devices (i.e. loopback) */
7671 if (dev->features & NETIF_F_NETNS_LOCAL)
7674 /* Leave virtual devices for the generic cleanup */
7675 if (dev->rtnl_link_ops)
7678 /* Push remaining network devices to init_net */
7679 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
7680 err = dev_change_net_namespace(dev, &init_net, fb_name);
7682 pr_emerg("%s: failed to move %s to init_net: %d\n",
7683 __func__, dev->name, err);
7690 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
7692 /* Return with the rtnl_lock held when there are no network
7693 * devices unregistering in any network namespace in net_list.
7697 DEFINE_WAIT_FUNC(wait, woken_wake_function);
7699 add_wait_queue(&netdev_unregistering_wq, &wait);
7701 unregistering = false;
7703 list_for_each_entry(net, net_list, exit_list) {
7704 if (net->dev_unreg_count > 0) {
7705 unregistering = true;
7713 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
7715 remove_wait_queue(&netdev_unregistering_wq, &wait);
7718 static void __net_exit default_device_exit_batch(struct list_head *net_list)
7720 /* At exit all network devices most be removed from a network
7721 * namespace. Do this in the reverse order of registration.
7722 * Do this across as many network namespaces as possible to
7723 * improve batching efficiency.
7725 struct net_device *dev;
7727 LIST_HEAD(dev_kill_list);
7729 /* To prevent network device cleanup code from dereferencing
7730 * loopback devices or network devices that have been freed
7731 * wait here for all pending unregistrations to complete,
7732 * before unregistring the loopback device and allowing the
7733 * network namespace be freed.
7735 * The netdev todo list containing all network devices
7736 * unregistrations that happen in default_device_exit_batch
7737 * will run in the rtnl_unlock() at the end of
7738 * default_device_exit_batch.
7740 rtnl_lock_unregistering(net_list);
7741 list_for_each_entry(net, net_list, exit_list) {
7742 for_each_netdev_reverse(net, dev) {
7743 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
7744 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
7746 unregister_netdevice_queue(dev, &dev_kill_list);
7749 unregister_netdevice_many(&dev_kill_list);
7753 static struct pernet_operations __net_initdata default_device_ops = {
7754 .exit = default_device_exit,
7755 .exit_batch = default_device_exit_batch,
7759 * Initialize the DEV module. At boot time this walks the device list and
7760 * unhooks any devices that fail to initialise (normally hardware not
7761 * present) and leaves us with a valid list of present and active devices.
7766 * This is called single threaded during boot, so no need
7767 * to take the rtnl semaphore.
7769 static int __init net_dev_init(void)
7771 int i, rc = -ENOMEM;
7773 BUG_ON(!dev_boot_phase);
7775 if (dev_proc_init())
7778 if (netdev_kobject_init())
7781 INIT_LIST_HEAD(&ptype_all);
7782 for (i = 0; i < PTYPE_HASH_SIZE; i++)
7783 INIT_LIST_HEAD(&ptype_base[i]);
7785 INIT_LIST_HEAD(&offload_base);
7787 if (register_pernet_subsys(&netdev_net_ops))
7791 * Initialise the packet receive queues.
7794 for_each_possible_cpu(i) {
7795 struct softnet_data *sd = &per_cpu(softnet_data, i);
7797 skb_queue_head_init(&sd->input_pkt_queue);
7798 skb_queue_head_init(&sd->process_queue);
7799 INIT_LIST_HEAD(&sd->poll_list);
7800 sd->output_queue_tailp = &sd->output_queue;
7802 sd->csd.func = rps_trigger_softirq;
7807 sd->backlog.poll = process_backlog;
7808 sd->backlog.weight = weight_p;
7813 /* The loopback device is special if any other network devices
7814 * is present in a network namespace the loopback device must
7815 * be present. Since we now dynamically allocate and free the
7816 * loopback device ensure this invariant is maintained by
7817 * keeping the loopback device as the first device on the
7818 * list of network devices. Ensuring the loopback devices
7819 * is the first device that appears and the last network device
7822 if (register_pernet_device(&loopback_net_ops))
7825 if (register_pernet_device(&default_device_ops))
7828 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
7829 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
7831 hotcpu_notifier(dev_cpu_callback, 0);
7838 subsys_initcall(net_dev_init);