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 <linux/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/sched/mm.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/skbuff.h>
97 #include <linux/bpf.h>
98 #include <linux/bpf_trace.h>
99 #include <net/net_namespace.h>
100 #include <net/sock.h>
101 #include <net/busy_poll.h>
102 #include <linux/rtnetlink.h>
103 #include <linux/stat.h>
105 #include <net/dst_metadata.h>
106 #include <net/pkt_sched.h>
107 #include <net/pkt_cls.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/module.h>
113 #include <linux/netpoll.h>
114 #include <linux/rcupdate.h>
115 #include <linux/delay.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <net/mpls.h>
127 #include <linux/ipv6.h>
128 #include <linux/in.h>
129 #include <linux/jhash.h>
130 #include <linux/random.h>
131 #include <trace/events/napi.h>
132 #include <trace/events/net.h>
133 #include <trace/events/skb.h>
134 #include <linux/pci.h>
135 #include <linux/inetdevice.h>
136 #include <linux/cpu_rmap.h>
137 #include <linux/static_key.h>
138 #include <linux/hashtable.h>
139 #include <linux/vmalloc.h>
140 #include <linux/if_macvlan.h>
141 #include <linux/errqueue.h>
142 #include <linux/hrtimer.h>
143 #include <linux/netfilter_ingress.h>
144 #include <linux/crash_dump.h>
145 #include <linux/sctp.h>
146 #include <net/udp_tunnel.h>
147 #include <linux/net_namespace.h>
148 #include <linux/indirect_call_wrapper.h>
150 #include "net-sysfs.h"
152 #define MAX_GRO_SKBS 8
154 /* This should be increased if a protocol with a bigger head is added. */
155 #define GRO_MAX_HEAD (MAX_HEADER + 128)
157 static DEFINE_SPINLOCK(ptype_lock);
158 static DEFINE_SPINLOCK(offload_lock);
159 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
160 struct list_head ptype_all __read_mostly; /* Taps */
161 static struct list_head offload_base __read_mostly;
163 static int netif_rx_internal(struct sk_buff *skb);
164 static int call_netdevice_notifiers_info(unsigned long val,
165 struct netdev_notifier_info *info);
166 static int call_netdevice_notifiers_extack(unsigned long val,
167 struct net_device *dev,
168 struct netlink_ext_ack *extack);
169 static struct napi_struct *napi_by_id(unsigned int napi_id);
172 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
175 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
177 * Writers must hold the rtnl semaphore while they loop through the
178 * dev_base_head list, and hold dev_base_lock for writing when they do the
179 * actual updates. This allows pure readers to access the list even
180 * while a writer is preparing to update it.
182 * To put it another way, dev_base_lock is held for writing only to
183 * protect against pure readers; the rtnl semaphore provides the
184 * protection against other writers.
186 * See, for example usages, register_netdevice() and
187 * unregister_netdevice(), which must be called with the rtnl
190 DEFINE_RWLOCK(dev_base_lock);
191 EXPORT_SYMBOL(dev_base_lock);
193 static DEFINE_MUTEX(ifalias_mutex);
195 /* protects napi_hash addition/deletion and napi_gen_id */
196 static DEFINE_SPINLOCK(napi_hash_lock);
198 static unsigned int napi_gen_id = NR_CPUS;
199 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
201 static seqcount_t devnet_rename_seq;
203 static inline void dev_base_seq_inc(struct net *net)
205 while (++net->dev_base_seq == 0)
209 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
211 unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ));
213 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
216 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
218 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
221 static inline void rps_lock(struct softnet_data *sd)
224 spin_lock(&sd->input_pkt_queue.lock);
228 static inline void rps_unlock(struct softnet_data *sd)
231 spin_unlock(&sd->input_pkt_queue.lock);
235 /* Device list insertion */
236 static void list_netdevice(struct net_device *dev)
238 struct net *net = dev_net(dev);
242 write_lock_bh(&dev_base_lock);
243 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
244 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
245 hlist_add_head_rcu(&dev->index_hlist,
246 dev_index_hash(net, dev->ifindex));
247 write_unlock_bh(&dev_base_lock);
249 dev_base_seq_inc(net);
252 /* Device list removal
253 * caller must respect a RCU grace period before freeing/reusing dev
255 static void unlist_netdevice(struct net_device *dev)
259 /* Unlink dev from the device chain */
260 write_lock_bh(&dev_base_lock);
261 list_del_rcu(&dev->dev_list);
262 hlist_del_rcu(&dev->name_hlist);
263 hlist_del_rcu(&dev->index_hlist);
264 write_unlock_bh(&dev_base_lock);
266 dev_base_seq_inc(dev_net(dev));
273 static RAW_NOTIFIER_HEAD(netdev_chain);
276 * Device drivers call our routines to queue packets here. We empty the
277 * queue in the local softnet handler.
280 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
281 EXPORT_PER_CPU_SYMBOL(softnet_data);
283 #ifdef CONFIG_LOCKDEP
285 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
286 * according to dev->type
288 static const unsigned short netdev_lock_type[] = {
289 ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
290 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
291 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
292 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
293 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
294 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
295 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
296 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
297 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
298 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
299 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
300 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
301 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
302 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
303 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
305 static const char *const netdev_lock_name[] = {
306 "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
307 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
308 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
309 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
310 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
311 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
312 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
313 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
314 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
315 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
316 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
317 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
318 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
319 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
320 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
322 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
323 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
325 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
329 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
330 if (netdev_lock_type[i] == dev_type)
332 /* the last key is used by default */
333 return ARRAY_SIZE(netdev_lock_type) - 1;
336 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
337 unsigned short dev_type)
341 i = netdev_lock_pos(dev_type);
342 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
343 netdev_lock_name[i]);
346 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
350 i = netdev_lock_pos(dev->type);
351 lockdep_set_class_and_name(&dev->addr_list_lock,
352 &netdev_addr_lock_key[i],
353 netdev_lock_name[i]);
356 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
357 unsigned short dev_type)
360 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
365 /*******************************************************************************
367 * Protocol management and registration routines
369 *******************************************************************************/
373 * Add a protocol ID to the list. Now that the input handler is
374 * smarter we can dispense with all the messy stuff that used to be
377 * BEWARE!!! Protocol handlers, mangling input packets,
378 * MUST BE last in hash buckets and checking protocol handlers
379 * MUST start from promiscuous ptype_all chain in net_bh.
380 * It is true now, do not change it.
381 * Explanation follows: if protocol handler, mangling packet, will
382 * be the first on list, it is not able to sense, that packet
383 * is cloned and should be copied-on-write, so that it will
384 * change it and subsequent readers will get broken packet.
388 static inline struct list_head *ptype_head(const struct packet_type *pt)
390 if (pt->type == htons(ETH_P_ALL))
391 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
393 return pt->dev ? &pt->dev->ptype_specific :
394 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
398 * dev_add_pack - add packet handler
399 * @pt: packet type declaration
401 * Add a protocol handler to the networking stack. The passed &packet_type
402 * is linked into kernel lists and may not be freed until it has been
403 * removed from the kernel lists.
405 * This call does not sleep therefore it can not
406 * guarantee all CPU's that are in middle of receiving packets
407 * will see the new packet type (until the next received packet).
410 void dev_add_pack(struct packet_type *pt)
412 struct list_head *head = ptype_head(pt);
414 spin_lock(&ptype_lock);
415 list_add_rcu(&pt->list, head);
416 spin_unlock(&ptype_lock);
418 EXPORT_SYMBOL(dev_add_pack);
421 * __dev_remove_pack - remove packet handler
422 * @pt: packet type declaration
424 * Remove a protocol handler that was previously added to the kernel
425 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
426 * from the kernel lists and can be freed or reused once this function
429 * The packet type might still be in use by receivers
430 * and must not be freed until after all the CPU's have gone
431 * through a quiescent state.
433 void __dev_remove_pack(struct packet_type *pt)
435 struct list_head *head = ptype_head(pt);
436 struct packet_type *pt1;
438 spin_lock(&ptype_lock);
440 list_for_each_entry(pt1, head, list) {
442 list_del_rcu(&pt->list);
447 pr_warn("dev_remove_pack: %p not found\n", pt);
449 spin_unlock(&ptype_lock);
451 EXPORT_SYMBOL(__dev_remove_pack);
454 * dev_remove_pack - remove packet handler
455 * @pt: packet type declaration
457 * Remove a protocol handler that was previously added to the kernel
458 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
459 * from the kernel lists and can be freed or reused once this function
462 * This call sleeps to guarantee that no CPU is looking at the packet
465 void dev_remove_pack(struct packet_type *pt)
467 __dev_remove_pack(pt);
471 EXPORT_SYMBOL(dev_remove_pack);
475 * dev_add_offload - register offload handlers
476 * @po: protocol offload declaration
478 * Add protocol offload handlers to the networking stack. The passed
479 * &proto_offload is linked into kernel lists and may not be freed until
480 * it has been removed from the kernel lists.
482 * This call does not sleep therefore it can not
483 * guarantee all CPU's that are in middle of receiving packets
484 * will see the new offload handlers (until the next received packet).
486 void dev_add_offload(struct packet_offload *po)
488 struct packet_offload *elem;
490 spin_lock(&offload_lock);
491 list_for_each_entry(elem, &offload_base, list) {
492 if (po->priority < elem->priority)
495 list_add_rcu(&po->list, elem->list.prev);
496 spin_unlock(&offload_lock);
498 EXPORT_SYMBOL(dev_add_offload);
501 * __dev_remove_offload - remove offload handler
502 * @po: packet offload declaration
504 * Remove a protocol offload handler that was previously added to the
505 * kernel offload handlers by dev_add_offload(). The passed &offload_type
506 * is removed from the kernel lists and can be freed or reused once this
509 * The packet type might still be in use by receivers
510 * and must not be freed until after all the CPU's have gone
511 * through a quiescent state.
513 static void __dev_remove_offload(struct packet_offload *po)
515 struct list_head *head = &offload_base;
516 struct packet_offload *po1;
518 spin_lock(&offload_lock);
520 list_for_each_entry(po1, head, list) {
522 list_del_rcu(&po->list);
527 pr_warn("dev_remove_offload: %p not found\n", po);
529 spin_unlock(&offload_lock);
533 * dev_remove_offload - remove packet offload handler
534 * @po: packet offload declaration
536 * Remove a packet offload handler that was previously added to the kernel
537 * offload handlers by dev_add_offload(). The passed &offload_type is
538 * removed from the kernel lists and can be freed or reused once this
541 * This call sleeps to guarantee that no CPU is looking at the packet
544 void dev_remove_offload(struct packet_offload *po)
546 __dev_remove_offload(po);
550 EXPORT_SYMBOL(dev_remove_offload);
552 /******************************************************************************
554 * Device Boot-time Settings Routines
556 ******************************************************************************/
558 /* Boot time configuration table */
559 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
562 * netdev_boot_setup_add - add new setup entry
563 * @name: name of the device
564 * @map: configured settings for the device
566 * Adds new setup entry to the dev_boot_setup list. The function
567 * returns 0 on error and 1 on success. This is a generic routine to
570 static int netdev_boot_setup_add(char *name, struct ifmap *map)
572 struct netdev_boot_setup *s;
576 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
577 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
578 memset(s[i].name, 0, sizeof(s[i].name));
579 strlcpy(s[i].name, name, IFNAMSIZ);
580 memcpy(&s[i].map, map, sizeof(s[i].map));
585 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
589 * netdev_boot_setup_check - check boot time settings
590 * @dev: the netdevice
592 * Check boot time settings for the device.
593 * The found settings are set for the device to be used
594 * later in the device probing.
595 * Returns 0 if no settings found, 1 if they are.
597 int netdev_boot_setup_check(struct net_device *dev)
599 struct netdev_boot_setup *s = dev_boot_setup;
602 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
603 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
604 !strcmp(dev->name, s[i].name)) {
605 dev->irq = s[i].map.irq;
606 dev->base_addr = s[i].map.base_addr;
607 dev->mem_start = s[i].map.mem_start;
608 dev->mem_end = s[i].map.mem_end;
614 EXPORT_SYMBOL(netdev_boot_setup_check);
618 * netdev_boot_base - get address from boot time settings
619 * @prefix: prefix for network device
620 * @unit: id for network device
622 * Check boot time settings for the base address of device.
623 * The found settings are set for the device to be used
624 * later in the device probing.
625 * Returns 0 if no settings found.
627 unsigned long netdev_boot_base(const char *prefix, int unit)
629 const struct netdev_boot_setup *s = dev_boot_setup;
633 sprintf(name, "%s%d", prefix, unit);
636 * If device already registered then return base of 1
637 * to indicate not to probe for this interface
639 if (__dev_get_by_name(&init_net, name))
642 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
643 if (!strcmp(name, s[i].name))
644 return s[i].map.base_addr;
649 * Saves at boot time configured settings for any netdevice.
651 int __init netdev_boot_setup(char *str)
656 str = get_options(str, ARRAY_SIZE(ints), ints);
661 memset(&map, 0, sizeof(map));
665 map.base_addr = ints[2];
667 map.mem_start = ints[3];
669 map.mem_end = ints[4];
671 /* Add new entry to the list */
672 return netdev_boot_setup_add(str, &map);
675 __setup("netdev=", netdev_boot_setup);
677 /*******************************************************************************
679 * Device Interface Subroutines
681 *******************************************************************************/
684 * dev_get_iflink - get 'iflink' value of a interface
685 * @dev: targeted interface
687 * Indicates the ifindex the interface is linked to.
688 * Physical interfaces have the same 'ifindex' and 'iflink' values.
691 int dev_get_iflink(const struct net_device *dev)
693 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
694 return dev->netdev_ops->ndo_get_iflink(dev);
698 EXPORT_SYMBOL(dev_get_iflink);
701 * dev_fill_metadata_dst - Retrieve tunnel egress information.
702 * @dev: targeted interface
705 * For better visibility of tunnel traffic OVS needs to retrieve
706 * egress tunnel information for a packet. Following API allows
707 * user to get this info.
709 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
711 struct ip_tunnel_info *info;
713 if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst)
716 info = skb_tunnel_info_unclone(skb);
719 if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
722 return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
724 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
727 * __dev_get_by_name - find a device by its name
728 * @net: the applicable net namespace
729 * @name: name to find
731 * Find an interface by name. Must be called under RTNL semaphore
732 * or @dev_base_lock. If the name is found a pointer to the device
733 * is returned. If the name is not found then %NULL is returned. The
734 * reference counters are not incremented so the caller must be
735 * careful with locks.
738 struct net_device *__dev_get_by_name(struct net *net, const char *name)
740 struct net_device *dev;
741 struct hlist_head *head = dev_name_hash(net, name);
743 hlist_for_each_entry(dev, head, name_hlist)
744 if (!strncmp(dev->name, name, IFNAMSIZ))
749 EXPORT_SYMBOL(__dev_get_by_name);
752 * dev_get_by_name_rcu - find a device by its name
753 * @net: the applicable net namespace
754 * @name: name to find
756 * Find an interface by name.
757 * If the name is found a pointer to the device is returned.
758 * If the name is not found then %NULL is returned.
759 * The reference counters are not incremented so the caller must be
760 * careful with locks. The caller must hold RCU lock.
763 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
765 struct net_device *dev;
766 struct hlist_head *head = dev_name_hash(net, name);
768 hlist_for_each_entry_rcu(dev, head, name_hlist)
769 if (!strncmp(dev->name, name, IFNAMSIZ))
774 EXPORT_SYMBOL(dev_get_by_name_rcu);
777 * dev_get_by_name - find a device by its name
778 * @net: the applicable net namespace
779 * @name: name to find
781 * Find an interface by name. This can be called from any
782 * context and does its own locking. The returned handle has
783 * the usage count incremented and the caller must use dev_put() to
784 * release it when it is no longer needed. %NULL is returned if no
785 * matching device is found.
788 struct net_device *dev_get_by_name(struct net *net, const char *name)
790 struct net_device *dev;
793 dev = dev_get_by_name_rcu(net, name);
799 EXPORT_SYMBOL(dev_get_by_name);
802 * __dev_get_by_index - find a device by its ifindex
803 * @net: the applicable net namespace
804 * @ifindex: index of device
806 * Search for an interface by index. Returns %NULL if the device
807 * is not found or a pointer to the device. The device has not
808 * had its reference counter increased so the caller must be careful
809 * about locking. The caller must hold either the RTNL semaphore
813 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
815 struct net_device *dev;
816 struct hlist_head *head = dev_index_hash(net, ifindex);
818 hlist_for_each_entry(dev, head, index_hlist)
819 if (dev->ifindex == ifindex)
824 EXPORT_SYMBOL(__dev_get_by_index);
827 * dev_get_by_index_rcu - find a device by its ifindex
828 * @net: the applicable net namespace
829 * @ifindex: index of device
831 * Search for an interface by index. Returns %NULL if the device
832 * is not found or a pointer to the device. The device has not
833 * had its reference counter increased so the caller must be careful
834 * about locking. The caller must hold RCU lock.
837 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
839 struct net_device *dev;
840 struct hlist_head *head = dev_index_hash(net, ifindex);
842 hlist_for_each_entry_rcu(dev, head, index_hlist)
843 if (dev->ifindex == ifindex)
848 EXPORT_SYMBOL(dev_get_by_index_rcu);
852 * dev_get_by_index - find a device by its ifindex
853 * @net: the applicable net namespace
854 * @ifindex: index of device
856 * Search for an interface by index. Returns NULL if the device
857 * is not found or a pointer to the device. The device returned has
858 * had a reference added and the pointer is safe until the user calls
859 * dev_put to indicate they have finished with it.
862 struct net_device *dev_get_by_index(struct net *net, int ifindex)
864 struct net_device *dev;
867 dev = dev_get_by_index_rcu(net, ifindex);
873 EXPORT_SYMBOL(dev_get_by_index);
876 * dev_get_by_napi_id - find a device by napi_id
877 * @napi_id: ID of the NAPI struct
879 * Search for an interface by NAPI ID. Returns %NULL if the device
880 * is not found or a pointer to the device. The device has not had
881 * its reference counter increased so the caller must be careful
882 * about locking. The caller must hold RCU lock.
885 struct net_device *dev_get_by_napi_id(unsigned int napi_id)
887 struct napi_struct *napi;
889 WARN_ON_ONCE(!rcu_read_lock_held());
891 if (napi_id < MIN_NAPI_ID)
894 napi = napi_by_id(napi_id);
896 return napi ? napi->dev : NULL;
898 EXPORT_SYMBOL(dev_get_by_napi_id);
901 * netdev_get_name - get a netdevice name, knowing its ifindex.
902 * @net: network namespace
903 * @name: a pointer to the buffer where the name will be stored.
904 * @ifindex: the ifindex of the interface to get the name from.
906 * The use of raw_seqcount_begin() and cond_resched() before
907 * retrying is required as we want to give the writers a chance
908 * to complete when CONFIG_PREEMPT is not set.
910 int netdev_get_name(struct net *net, char *name, int ifindex)
912 struct net_device *dev;
916 seq = raw_seqcount_begin(&devnet_rename_seq);
918 dev = dev_get_by_index_rcu(net, ifindex);
924 strcpy(name, dev->name);
926 if (read_seqcount_retry(&devnet_rename_seq, seq)) {
935 * dev_getbyhwaddr_rcu - find a device by its hardware address
936 * @net: the applicable net namespace
937 * @type: media type of device
938 * @ha: hardware address
940 * Search for an interface by MAC address. Returns NULL if the device
941 * is not found or a pointer to the device.
942 * The caller must hold RCU or RTNL.
943 * The returned device has not had its ref count increased
944 * and the caller must therefore be careful about locking
948 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
951 struct net_device *dev;
953 for_each_netdev_rcu(net, dev)
954 if (dev->type == type &&
955 !memcmp(dev->dev_addr, ha, dev->addr_len))
960 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
962 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
964 struct net_device *dev;
967 for_each_netdev(net, dev)
968 if (dev->type == type)
973 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
975 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
977 struct net_device *dev, *ret = NULL;
980 for_each_netdev_rcu(net, dev)
981 if (dev->type == type) {
989 EXPORT_SYMBOL(dev_getfirstbyhwtype);
992 * __dev_get_by_flags - find any device with given flags
993 * @net: the applicable net namespace
994 * @if_flags: IFF_* values
995 * @mask: bitmask of bits in if_flags to check
997 * Search for any interface with the given flags. Returns NULL if a device
998 * is not found or a pointer to the device. Must be called inside
999 * rtnl_lock(), and result refcount is unchanged.
1002 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
1003 unsigned short mask)
1005 struct net_device *dev, *ret;
1010 for_each_netdev(net, dev) {
1011 if (((dev->flags ^ if_flags) & mask) == 0) {
1018 EXPORT_SYMBOL(__dev_get_by_flags);
1021 * dev_valid_name - check if name is okay for network device
1022 * @name: name string
1024 * Network device names need to be valid file names to
1025 * to allow sysfs to work. We also disallow any kind of
1028 bool dev_valid_name(const char *name)
1032 if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
1034 if (!strcmp(name, ".") || !strcmp(name, ".."))
1038 if (*name == '/' || *name == ':' || isspace(*name))
1044 EXPORT_SYMBOL(dev_valid_name);
1047 * __dev_alloc_name - allocate a name for a device
1048 * @net: network namespace to allocate the device name in
1049 * @name: name format string
1050 * @buf: scratch buffer and result name string
1052 * Passed a format string - eg "lt%d" it will try and find a suitable
1053 * id. It scans list of devices to build up a free map, then chooses
1054 * the first empty slot. The caller must hold the dev_base or rtnl lock
1055 * while allocating the name and adding the device in order to avoid
1057 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1058 * Returns the number of the unit assigned or a negative errno code.
1061 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
1065 const int max_netdevices = 8*PAGE_SIZE;
1066 unsigned long *inuse;
1067 struct net_device *d;
1069 if (!dev_valid_name(name))
1072 p = strchr(name, '%');
1075 * Verify the string as this thing may have come from
1076 * the user. There must be either one "%d" and no other "%"
1079 if (p[1] != 'd' || strchr(p + 2, '%'))
1082 /* Use one page as a bit array of possible slots */
1083 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
1087 for_each_netdev(net, d) {
1088 if (!sscanf(d->name, name, &i))
1090 if (i < 0 || i >= max_netdevices)
1093 /* avoid cases where sscanf is not exact inverse of printf */
1094 snprintf(buf, IFNAMSIZ, name, i);
1095 if (!strncmp(buf, d->name, IFNAMSIZ))
1099 i = find_first_zero_bit(inuse, max_netdevices);
1100 free_page((unsigned long) inuse);
1103 snprintf(buf, IFNAMSIZ, name, i);
1104 if (!__dev_get_by_name(net, buf))
1107 /* It is possible to run out of possible slots
1108 * when the name is long and there isn't enough space left
1109 * for the digits, or if all bits are used.
1114 static int dev_alloc_name_ns(struct net *net,
1115 struct net_device *dev,
1122 ret = __dev_alloc_name(net, name, buf);
1124 strlcpy(dev->name, buf, IFNAMSIZ);
1129 * dev_alloc_name - allocate a name for a device
1131 * @name: name format string
1133 * Passed a format string - eg "lt%d" it will try and find a suitable
1134 * id. It scans list of devices to build up a free map, then chooses
1135 * the first empty slot. The caller must hold the dev_base or rtnl lock
1136 * while allocating the name and adding the device in order to avoid
1138 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1139 * Returns the number of the unit assigned or a negative errno code.
1142 int dev_alloc_name(struct net_device *dev, const char *name)
1144 return dev_alloc_name_ns(dev_net(dev), dev, name);
1146 EXPORT_SYMBOL(dev_alloc_name);
1148 int dev_get_valid_name(struct net *net, struct net_device *dev,
1153 if (!dev_valid_name(name))
1156 if (strchr(name, '%'))
1157 return dev_alloc_name_ns(net, dev, name);
1158 else if (__dev_get_by_name(net, name))
1160 else if (dev->name != name)
1161 strlcpy(dev->name, name, IFNAMSIZ);
1165 EXPORT_SYMBOL(dev_get_valid_name);
1168 * dev_change_name - change name of a device
1170 * @newname: name (or format string) must be at least IFNAMSIZ
1172 * Change name of a device, can pass format strings "eth%d".
1175 int dev_change_name(struct net_device *dev, const char *newname)
1177 unsigned char old_assign_type;
1178 char oldname[IFNAMSIZ];
1184 BUG_ON(!dev_net(dev));
1187 if (dev->flags & IFF_UP)
1190 write_seqcount_begin(&devnet_rename_seq);
1192 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1193 write_seqcount_end(&devnet_rename_seq);
1197 memcpy(oldname, dev->name, IFNAMSIZ);
1199 err = dev_get_valid_name(net, dev, newname);
1201 write_seqcount_end(&devnet_rename_seq);
1205 if (oldname[0] && !strchr(oldname, '%'))
1206 netdev_info(dev, "renamed from %s\n", oldname);
1208 old_assign_type = dev->name_assign_type;
1209 dev->name_assign_type = NET_NAME_RENAMED;
1212 ret = device_rename(&dev->dev, dev->name);
1214 memcpy(dev->name, oldname, IFNAMSIZ);
1215 dev->name_assign_type = old_assign_type;
1216 write_seqcount_end(&devnet_rename_seq);
1220 write_seqcount_end(&devnet_rename_seq);
1222 netdev_adjacent_rename_links(dev, oldname);
1224 write_lock_bh(&dev_base_lock);
1225 hlist_del_rcu(&dev->name_hlist);
1226 write_unlock_bh(&dev_base_lock);
1230 write_lock_bh(&dev_base_lock);
1231 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1232 write_unlock_bh(&dev_base_lock);
1234 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1235 ret = notifier_to_errno(ret);
1238 /* err >= 0 after dev_alloc_name() or stores the first errno */
1241 write_seqcount_begin(&devnet_rename_seq);
1242 memcpy(dev->name, oldname, IFNAMSIZ);
1243 memcpy(oldname, newname, IFNAMSIZ);
1244 dev->name_assign_type = old_assign_type;
1245 old_assign_type = NET_NAME_RENAMED;
1248 pr_err("%s: name change rollback failed: %d\n",
1257 * dev_set_alias - change ifalias of a device
1259 * @alias: name up to IFALIASZ
1260 * @len: limit of bytes to copy from info
1262 * Set ifalias for a device,
1264 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1266 struct dev_ifalias *new_alias = NULL;
1268 if (len >= IFALIASZ)
1272 new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL);
1276 memcpy(new_alias->ifalias, alias, len);
1277 new_alias->ifalias[len] = 0;
1280 mutex_lock(&ifalias_mutex);
1281 rcu_swap_protected(dev->ifalias, new_alias,
1282 mutex_is_locked(&ifalias_mutex));
1283 mutex_unlock(&ifalias_mutex);
1286 kfree_rcu(new_alias, rcuhead);
1290 EXPORT_SYMBOL(dev_set_alias);
1293 * dev_get_alias - get ifalias of a device
1295 * @name: buffer to store name of ifalias
1296 * @len: size of buffer
1298 * get ifalias for a device. Caller must make sure dev cannot go
1299 * away, e.g. rcu read lock or own a reference count to device.
1301 int dev_get_alias(const struct net_device *dev, char *name, size_t len)
1303 const struct dev_ifalias *alias;
1307 alias = rcu_dereference(dev->ifalias);
1309 ret = snprintf(name, len, "%s", alias->ifalias);
1316 * netdev_features_change - device changes features
1317 * @dev: device to cause notification
1319 * Called to indicate a device has changed features.
1321 void netdev_features_change(struct net_device *dev)
1323 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1325 EXPORT_SYMBOL(netdev_features_change);
1328 * netdev_state_change - device changes state
1329 * @dev: device to cause notification
1331 * Called to indicate a device has changed state. This function calls
1332 * the notifier chains for netdev_chain and sends a NEWLINK message
1333 * to the routing socket.
1335 void netdev_state_change(struct net_device *dev)
1337 if (dev->flags & IFF_UP) {
1338 struct netdev_notifier_change_info change_info = {
1342 call_netdevice_notifiers_info(NETDEV_CHANGE,
1344 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1347 EXPORT_SYMBOL(netdev_state_change);
1350 * netdev_notify_peers - notify network peers about existence of @dev
1351 * @dev: network device
1353 * Generate traffic such that interested network peers are aware of
1354 * @dev, such as by generating a gratuitous ARP. This may be used when
1355 * a device wants to inform the rest of the network about some sort of
1356 * reconfiguration such as a failover event or virtual machine
1359 void netdev_notify_peers(struct net_device *dev)
1362 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1363 call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev);
1366 EXPORT_SYMBOL(netdev_notify_peers);
1368 static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
1370 const struct net_device_ops *ops = dev->netdev_ops;
1375 if (!netif_device_present(dev))
1378 /* Block netpoll from trying to do any rx path servicing.
1379 * If we don't do this there is a chance ndo_poll_controller
1380 * or ndo_poll may be running while we open the device
1382 netpoll_poll_disable(dev);
1384 ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack);
1385 ret = notifier_to_errno(ret);
1389 set_bit(__LINK_STATE_START, &dev->state);
1391 if (ops->ndo_validate_addr)
1392 ret = ops->ndo_validate_addr(dev);
1394 if (!ret && ops->ndo_open)
1395 ret = ops->ndo_open(dev);
1397 netpoll_poll_enable(dev);
1400 clear_bit(__LINK_STATE_START, &dev->state);
1402 dev->flags |= IFF_UP;
1403 dev_set_rx_mode(dev);
1405 add_device_randomness(dev->dev_addr, dev->addr_len);
1412 * dev_open - prepare an interface for use.
1413 * @dev: device to open
1414 * @extack: netlink extended ack
1416 * Takes a device from down to up state. The device's private open
1417 * function is invoked and then the multicast lists are loaded. Finally
1418 * the device is moved into the up state and a %NETDEV_UP message is
1419 * sent to the netdev notifier chain.
1421 * Calling this function on an active interface is a nop. On a failure
1422 * a negative errno code is returned.
1424 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
1428 if (dev->flags & IFF_UP)
1431 ret = __dev_open(dev, extack);
1435 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1436 call_netdevice_notifiers(NETDEV_UP, dev);
1440 EXPORT_SYMBOL(dev_open);
1442 static void __dev_close_many(struct list_head *head)
1444 struct net_device *dev;
1449 list_for_each_entry(dev, head, close_list) {
1450 /* Temporarily disable netpoll until the interface is down */
1451 netpoll_poll_disable(dev);
1453 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1455 clear_bit(__LINK_STATE_START, &dev->state);
1457 /* Synchronize to scheduled poll. We cannot touch poll list, it
1458 * can be even on different cpu. So just clear netif_running().
1460 * dev->stop() will invoke napi_disable() on all of it's
1461 * napi_struct instances on this device.
1463 smp_mb__after_atomic(); /* Commit netif_running(). */
1466 dev_deactivate_many(head);
1468 list_for_each_entry(dev, head, close_list) {
1469 const struct net_device_ops *ops = dev->netdev_ops;
1472 * Call the device specific close. This cannot fail.
1473 * Only if device is UP
1475 * We allow it to be called even after a DETACH hot-plug
1481 dev->flags &= ~IFF_UP;
1482 netpoll_poll_enable(dev);
1486 static void __dev_close(struct net_device *dev)
1490 list_add(&dev->close_list, &single);
1491 __dev_close_many(&single);
1495 void dev_close_many(struct list_head *head, bool unlink)
1497 struct net_device *dev, *tmp;
1499 /* Remove the devices that don't need to be closed */
1500 list_for_each_entry_safe(dev, tmp, head, close_list)
1501 if (!(dev->flags & IFF_UP))
1502 list_del_init(&dev->close_list);
1504 __dev_close_many(head);
1506 list_for_each_entry_safe(dev, tmp, head, close_list) {
1507 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1508 call_netdevice_notifiers(NETDEV_DOWN, dev);
1510 list_del_init(&dev->close_list);
1513 EXPORT_SYMBOL(dev_close_many);
1516 * dev_close - shutdown an interface.
1517 * @dev: device to shutdown
1519 * This function moves an active device into down state. A
1520 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1521 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1524 void dev_close(struct net_device *dev)
1526 if (dev->flags & IFF_UP) {
1529 list_add(&dev->close_list, &single);
1530 dev_close_many(&single, true);
1534 EXPORT_SYMBOL(dev_close);
1538 * dev_disable_lro - disable Large Receive Offload on a device
1541 * Disable Large Receive Offload (LRO) on a net device. Must be
1542 * called under RTNL. This is needed if received packets may be
1543 * forwarded to another interface.
1545 void dev_disable_lro(struct net_device *dev)
1547 struct net_device *lower_dev;
1548 struct list_head *iter;
1550 dev->wanted_features &= ~NETIF_F_LRO;
1551 netdev_update_features(dev);
1553 if (unlikely(dev->features & NETIF_F_LRO))
1554 netdev_WARN(dev, "failed to disable LRO!\n");
1556 netdev_for_each_lower_dev(dev, lower_dev, iter)
1557 dev_disable_lro(lower_dev);
1559 EXPORT_SYMBOL(dev_disable_lro);
1562 * dev_disable_gro_hw - disable HW Generic Receive Offload on a device
1565 * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be
1566 * called under RTNL. This is needed if Generic XDP is installed on
1569 static void dev_disable_gro_hw(struct net_device *dev)
1571 dev->wanted_features &= ~NETIF_F_GRO_HW;
1572 netdev_update_features(dev);
1574 if (unlikely(dev->features & NETIF_F_GRO_HW))
1575 netdev_WARN(dev, "failed to disable GRO_HW!\n");
1578 const char *netdev_cmd_to_name(enum netdev_cmd cmd)
1581 case NETDEV_##val: \
1582 return "NETDEV_" __stringify(val);
1584 N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER)
1585 N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE)
1586 N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE)
1587 N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER)
1588 N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO)
1589 N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO)
1590 N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
1591 N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO)
1592 N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO)
1596 return "UNKNOWN_NETDEV_EVENT";
1598 EXPORT_SYMBOL_GPL(netdev_cmd_to_name);
1600 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1601 struct net_device *dev)
1603 struct netdev_notifier_info info = {
1607 return nb->notifier_call(nb, val, &info);
1610 static int dev_boot_phase = 1;
1613 * register_netdevice_notifier - register a network notifier block
1616 * Register a notifier to be called when network device events occur.
1617 * The notifier passed is linked into the kernel structures and must
1618 * not be reused until it has been unregistered. A negative errno code
1619 * is returned on a failure.
1621 * When registered all registration and up events are replayed
1622 * to the new notifier to allow device to have a race free
1623 * view of the network device list.
1626 int register_netdevice_notifier(struct notifier_block *nb)
1628 struct net_device *dev;
1629 struct net_device *last;
1633 /* Close race with setup_net() and cleanup_net() */
1634 down_write(&pernet_ops_rwsem);
1636 err = raw_notifier_chain_register(&netdev_chain, nb);
1642 for_each_netdev(net, dev) {
1643 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1644 err = notifier_to_errno(err);
1648 if (!(dev->flags & IFF_UP))
1651 call_netdevice_notifier(nb, NETDEV_UP, dev);
1657 up_write(&pernet_ops_rwsem);
1663 for_each_netdev(net, dev) {
1667 if (dev->flags & IFF_UP) {
1668 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1670 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1672 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1677 raw_notifier_chain_unregister(&netdev_chain, nb);
1680 EXPORT_SYMBOL(register_netdevice_notifier);
1683 * unregister_netdevice_notifier - unregister a network notifier block
1686 * Unregister a notifier previously registered by
1687 * register_netdevice_notifier(). The notifier is unlinked into the
1688 * kernel structures and may then be reused. A negative errno code
1689 * is returned on a failure.
1691 * After unregistering unregister and down device events are synthesized
1692 * for all devices on the device list to the removed notifier to remove
1693 * the need for special case cleanup code.
1696 int unregister_netdevice_notifier(struct notifier_block *nb)
1698 struct net_device *dev;
1702 /* Close race with setup_net() and cleanup_net() */
1703 down_write(&pernet_ops_rwsem);
1705 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1710 for_each_netdev(net, dev) {
1711 if (dev->flags & IFF_UP) {
1712 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1714 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1716 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1721 up_write(&pernet_ops_rwsem);
1724 EXPORT_SYMBOL(unregister_netdevice_notifier);
1727 * call_netdevice_notifiers_info - call all network notifier blocks
1728 * @val: value passed unmodified to notifier function
1729 * @info: notifier information data
1731 * Call all network notifier blocks. Parameters and return value
1732 * are as for raw_notifier_call_chain().
1735 static int call_netdevice_notifiers_info(unsigned long val,
1736 struct netdev_notifier_info *info)
1739 return raw_notifier_call_chain(&netdev_chain, val, info);
1742 static int call_netdevice_notifiers_extack(unsigned long val,
1743 struct net_device *dev,
1744 struct netlink_ext_ack *extack)
1746 struct netdev_notifier_info info = {
1751 return call_netdevice_notifiers_info(val, &info);
1755 * call_netdevice_notifiers - call all network notifier blocks
1756 * @val: value passed unmodified to notifier function
1757 * @dev: net_device pointer passed unmodified to notifier function
1759 * Call all network notifier blocks. Parameters and return value
1760 * are as for raw_notifier_call_chain().
1763 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1765 return call_netdevice_notifiers_extack(val, dev, NULL);
1767 EXPORT_SYMBOL(call_netdevice_notifiers);
1770 * call_netdevice_notifiers_mtu - call all network notifier blocks
1771 * @val: value passed unmodified to notifier function
1772 * @dev: net_device pointer passed unmodified to notifier function
1773 * @arg: additional u32 argument passed to the notifier function
1775 * Call all network notifier blocks. Parameters and return value
1776 * are as for raw_notifier_call_chain().
1778 static int call_netdevice_notifiers_mtu(unsigned long val,
1779 struct net_device *dev, u32 arg)
1781 struct netdev_notifier_info_ext info = {
1786 BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0);
1788 return call_netdevice_notifiers_info(val, &info.info);
1791 #ifdef CONFIG_NET_INGRESS
1792 static DEFINE_STATIC_KEY_FALSE(ingress_needed_key);
1794 void net_inc_ingress_queue(void)
1796 static_branch_inc(&ingress_needed_key);
1798 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
1800 void net_dec_ingress_queue(void)
1802 static_branch_dec(&ingress_needed_key);
1804 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
1807 #ifdef CONFIG_NET_EGRESS
1808 static DEFINE_STATIC_KEY_FALSE(egress_needed_key);
1810 void net_inc_egress_queue(void)
1812 static_branch_inc(&egress_needed_key);
1814 EXPORT_SYMBOL_GPL(net_inc_egress_queue);
1816 void net_dec_egress_queue(void)
1818 static_branch_dec(&egress_needed_key);
1820 EXPORT_SYMBOL_GPL(net_dec_egress_queue);
1823 static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key);
1824 #ifdef CONFIG_JUMP_LABEL
1825 static atomic_t netstamp_needed_deferred;
1826 static atomic_t netstamp_wanted;
1827 static void netstamp_clear(struct work_struct *work)
1829 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1832 wanted = atomic_add_return(deferred, &netstamp_wanted);
1834 static_branch_enable(&netstamp_needed_key);
1836 static_branch_disable(&netstamp_needed_key);
1838 static DECLARE_WORK(netstamp_work, netstamp_clear);
1841 void net_enable_timestamp(void)
1843 #ifdef CONFIG_JUMP_LABEL
1847 wanted = atomic_read(&netstamp_wanted);
1850 if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted)
1853 atomic_inc(&netstamp_needed_deferred);
1854 schedule_work(&netstamp_work);
1856 static_branch_inc(&netstamp_needed_key);
1859 EXPORT_SYMBOL(net_enable_timestamp);
1861 void net_disable_timestamp(void)
1863 #ifdef CONFIG_JUMP_LABEL
1867 wanted = atomic_read(&netstamp_wanted);
1870 if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted)
1873 atomic_dec(&netstamp_needed_deferred);
1874 schedule_work(&netstamp_work);
1876 static_branch_dec(&netstamp_needed_key);
1879 EXPORT_SYMBOL(net_disable_timestamp);
1881 static inline void net_timestamp_set(struct sk_buff *skb)
1884 if (static_branch_unlikely(&netstamp_needed_key))
1885 __net_timestamp(skb);
1888 #define net_timestamp_check(COND, SKB) \
1889 if (static_branch_unlikely(&netstamp_needed_key)) { \
1890 if ((COND) && !(SKB)->tstamp) \
1891 __net_timestamp(SKB); \
1894 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
1898 if (!(dev->flags & IFF_UP))
1901 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1902 if (skb->len <= len)
1905 /* if TSO is enabled, we don't care about the length as the packet
1906 * could be forwarded without being segmented before
1908 if (skb_is_gso(skb))
1913 EXPORT_SYMBOL_GPL(is_skb_forwardable);
1915 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1917 int ret = ____dev_forward_skb(dev, skb);
1920 skb->protocol = eth_type_trans(skb, dev);
1921 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1926 EXPORT_SYMBOL_GPL(__dev_forward_skb);
1929 * dev_forward_skb - loopback an skb to another netif
1931 * @dev: destination network device
1932 * @skb: buffer to forward
1935 * NET_RX_SUCCESS (no congestion)
1936 * NET_RX_DROP (packet was dropped, but freed)
1938 * dev_forward_skb can be used for injecting an skb from the
1939 * start_xmit function of one device into the receive queue
1940 * of another device.
1942 * The receiving device may be in another namespace, so
1943 * we have to clear all information in the skb that could
1944 * impact namespace isolation.
1946 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1948 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
1950 EXPORT_SYMBOL_GPL(dev_forward_skb);
1952 static inline int deliver_skb(struct sk_buff *skb,
1953 struct packet_type *pt_prev,
1954 struct net_device *orig_dev)
1956 if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
1958 refcount_inc(&skb->users);
1959 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1962 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
1963 struct packet_type **pt,
1964 struct net_device *orig_dev,
1966 struct list_head *ptype_list)
1968 struct packet_type *ptype, *pt_prev = *pt;
1970 list_for_each_entry_rcu(ptype, ptype_list, list) {
1971 if (ptype->type != type)
1974 deliver_skb(skb, pt_prev, orig_dev);
1980 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1982 if (!ptype->af_packet_priv || !skb->sk)
1985 if (ptype->id_match)
1986 return ptype->id_match(ptype, skb->sk);
1987 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1994 * dev_nit_active - return true if any network interface taps are in use
1996 * @dev: network device to check for the presence of taps
1998 bool dev_nit_active(struct net_device *dev)
2000 return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all);
2002 EXPORT_SYMBOL_GPL(dev_nit_active);
2005 * Support routine. Sends outgoing frames to any network
2006 * taps currently in use.
2009 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
2011 struct packet_type *ptype;
2012 struct sk_buff *skb2 = NULL;
2013 struct packet_type *pt_prev = NULL;
2014 struct list_head *ptype_list = &ptype_all;
2018 list_for_each_entry_rcu(ptype, ptype_list, list) {
2019 if (ptype->ignore_outgoing)
2022 /* Never send packets back to the socket
2023 * they originated from - MvS (miquels@drinkel.ow.org)
2025 if (skb_loop_sk(ptype, skb))
2029 deliver_skb(skb2, pt_prev, skb->dev);
2034 /* need to clone skb, done only once */
2035 skb2 = skb_clone(skb, GFP_ATOMIC);
2039 net_timestamp_set(skb2);
2041 /* skb->nh should be correctly
2042 * set by sender, so that the second statement is
2043 * just protection against buggy protocols.
2045 skb_reset_mac_header(skb2);
2047 if (skb_network_header(skb2) < skb2->data ||
2048 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
2049 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
2050 ntohs(skb2->protocol),
2052 skb_reset_network_header(skb2);
2055 skb2->transport_header = skb2->network_header;
2056 skb2->pkt_type = PACKET_OUTGOING;
2060 if (ptype_list == &ptype_all) {
2061 ptype_list = &dev->ptype_all;
2066 if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC))
2067 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
2073 EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);
2076 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
2077 * @dev: Network device
2078 * @txq: number of queues available
2080 * If real_num_tx_queues is changed the tc mappings may no longer be
2081 * valid. To resolve this verify the tc mapping remains valid and if
2082 * not NULL the mapping. With no priorities mapping to this
2083 * offset/count pair it will no longer be used. In the worst case TC0
2084 * is invalid nothing can be done so disable priority mappings. If is
2085 * expected that drivers will fix this mapping if they can before
2086 * calling netif_set_real_num_tx_queues.
2088 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
2091 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
2093 /* If TC0 is invalidated disable TC mapping */
2094 if (tc->offset + tc->count > txq) {
2095 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
2100 /* Invalidated prio to tc mappings set to TC0 */
2101 for (i = 1; i < TC_BITMASK + 1; i++) {
2102 int q = netdev_get_prio_tc_map(dev, i);
2104 tc = &dev->tc_to_txq[q];
2105 if (tc->offset + tc->count > txq) {
2106 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
2108 netdev_set_prio_tc_map(dev, i, 0);
2113 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq)
2116 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
2119 /* walk through the TCs and see if it falls into any of them */
2120 for (i = 0; i < TC_MAX_QUEUE; i++, tc++) {
2121 if ((txq - tc->offset) < tc->count)
2125 /* didn't find it, just return -1 to indicate no match */
2131 EXPORT_SYMBOL(netdev_txq_to_tc);
2134 struct static_key xps_needed __read_mostly;
2135 EXPORT_SYMBOL(xps_needed);
2136 struct static_key xps_rxqs_needed __read_mostly;
2137 EXPORT_SYMBOL(xps_rxqs_needed);
2138 static DEFINE_MUTEX(xps_map_mutex);
2139 #define xmap_dereference(P) \
2140 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
2142 static bool remove_xps_queue(struct xps_dev_maps *dev_maps,
2145 struct xps_map *map = NULL;
2149 map = xmap_dereference(dev_maps->attr_map[tci]);
2153 for (pos = map->len; pos--;) {
2154 if (map->queues[pos] != index)
2158 map->queues[pos] = map->queues[--map->len];
2162 RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL);
2163 kfree_rcu(map, rcu);
2170 static bool remove_xps_queue_cpu(struct net_device *dev,
2171 struct xps_dev_maps *dev_maps,
2172 int cpu, u16 offset, u16 count)
2174 int num_tc = dev->num_tc ? : 1;
2175 bool active = false;
2178 for (tci = cpu * num_tc; num_tc--; tci++) {
2181 for (i = count, j = offset; i--; j++) {
2182 if (!remove_xps_queue(dev_maps, tci, j))
2192 static void reset_xps_maps(struct net_device *dev,
2193 struct xps_dev_maps *dev_maps,
2197 static_key_slow_dec_cpuslocked(&xps_rxqs_needed);
2198 RCU_INIT_POINTER(dev->xps_rxqs_map, NULL);
2200 RCU_INIT_POINTER(dev->xps_cpus_map, NULL);
2202 static_key_slow_dec_cpuslocked(&xps_needed);
2203 kfree_rcu(dev_maps, rcu);
2206 static void clean_xps_maps(struct net_device *dev, const unsigned long *mask,
2207 struct xps_dev_maps *dev_maps, unsigned int nr_ids,
2208 u16 offset, u16 count, bool is_rxqs_map)
2210 bool active = false;
2213 for (j = -1; j = netif_attrmask_next(j, mask, nr_ids),
2215 active |= remove_xps_queue_cpu(dev, dev_maps, j, offset,
2218 reset_xps_maps(dev, dev_maps, is_rxqs_map);
2221 for (i = offset + (count - 1); count--; i--) {
2222 netdev_queue_numa_node_write(
2223 netdev_get_tx_queue(dev, i),
2229 static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
2232 const unsigned long *possible_mask = NULL;
2233 struct xps_dev_maps *dev_maps;
2234 unsigned int nr_ids;
2236 if (!static_key_false(&xps_needed))
2240 mutex_lock(&xps_map_mutex);
2242 if (static_key_false(&xps_rxqs_needed)) {
2243 dev_maps = xmap_dereference(dev->xps_rxqs_map);
2245 nr_ids = dev->num_rx_queues;
2246 clean_xps_maps(dev, possible_mask, dev_maps, nr_ids,
2247 offset, count, true);
2251 dev_maps = xmap_dereference(dev->xps_cpus_map);
2255 if (num_possible_cpus() > 1)
2256 possible_mask = cpumask_bits(cpu_possible_mask);
2257 nr_ids = nr_cpu_ids;
2258 clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count,
2262 mutex_unlock(&xps_map_mutex);
2266 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
2268 netif_reset_xps_queues(dev, index, dev->num_tx_queues - index);
2271 static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index,
2272 u16 index, bool is_rxqs_map)
2274 struct xps_map *new_map;
2275 int alloc_len = XPS_MIN_MAP_ALLOC;
2278 for (pos = 0; map && pos < map->len; pos++) {
2279 if (map->queues[pos] != index)
2284 /* Need to add tx-queue to this CPU's/rx-queue's existing map */
2286 if (pos < map->alloc_len)
2289 alloc_len = map->alloc_len * 2;
2292 /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's
2296 new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL);
2298 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
2299 cpu_to_node(attr_index));
2303 for (i = 0; i < pos; i++)
2304 new_map->queues[i] = map->queues[i];
2305 new_map->alloc_len = alloc_len;
2311 /* Must be called under cpus_read_lock */
2312 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
2313 u16 index, bool is_rxqs_map)
2315 const unsigned long *online_mask = NULL, *possible_mask = NULL;
2316 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
2317 int i, j, tci, numa_node_id = -2;
2318 int maps_sz, num_tc = 1, tc = 0;
2319 struct xps_map *map, *new_map;
2320 bool active = false;
2321 unsigned int nr_ids;
2324 /* Do not allow XPS on subordinate device directly */
2325 num_tc = dev->num_tc;
2329 /* If queue belongs to subordinate dev use its map */
2330 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
2332 tc = netdev_txq_to_tc(dev, index);
2337 mutex_lock(&xps_map_mutex);
2339 maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues);
2340 dev_maps = xmap_dereference(dev->xps_rxqs_map);
2341 nr_ids = dev->num_rx_queues;
2343 maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc);
2344 if (num_possible_cpus() > 1) {
2345 online_mask = cpumask_bits(cpu_online_mask);
2346 possible_mask = cpumask_bits(cpu_possible_mask);
2348 dev_maps = xmap_dereference(dev->xps_cpus_map);
2349 nr_ids = nr_cpu_ids;
2352 if (maps_sz < L1_CACHE_BYTES)
2353 maps_sz = L1_CACHE_BYTES;
2355 /* allocate memory for queue storage */
2356 for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids),
2359 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2360 if (!new_dev_maps) {
2361 mutex_unlock(&xps_map_mutex);
2365 tci = j * num_tc + tc;
2366 map = dev_maps ? xmap_dereference(dev_maps->attr_map[tci]) :
2369 map = expand_xps_map(map, j, index, is_rxqs_map);
2373 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2377 goto out_no_new_maps;
2380 /* Increment static keys at most once per type */
2381 static_key_slow_inc_cpuslocked(&xps_needed);
2383 static_key_slow_inc_cpuslocked(&xps_rxqs_needed);
2386 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2388 /* copy maps belonging to foreign traffic classes */
2389 for (i = tc, tci = j * num_tc; dev_maps && i--; tci++) {
2390 /* fill in the new device map from the old device map */
2391 map = xmap_dereference(dev_maps->attr_map[tci]);
2392 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2395 /* We need to explicitly update tci as prevous loop
2396 * could break out early if dev_maps is NULL.
2398 tci = j * num_tc + tc;
2400 if (netif_attr_test_mask(j, mask, nr_ids) &&
2401 netif_attr_test_online(j, online_mask, nr_ids)) {
2402 /* add tx-queue to CPU/rx-queue maps */
2405 map = xmap_dereference(new_dev_maps->attr_map[tci]);
2406 while ((pos < map->len) && (map->queues[pos] != index))
2409 if (pos == map->len)
2410 map->queues[map->len++] = index;
2413 if (numa_node_id == -2)
2414 numa_node_id = cpu_to_node(j);
2415 else if (numa_node_id != cpu_to_node(j))
2419 } else if (dev_maps) {
2420 /* fill in the new device map from the old device map */
2421 map = xmap_dereference(dev_maps->attr_map[tci]);
2422 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2425 /* copy maps belonging to foreign traffic classes */
2426 for (i = num_tc - tc, tci++; dev_maps && --i; tci++) {
2427 /* fill in the new device map from the old device map */
2428 map = xmap_dereference(dev_maps->attr_map[tci]);
2429 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2434 rcu_assign_pointer(dev->xps_rxqs_map, new_dev_maps);
2436 rcu_assign_pointer(dev->xps_cpus_map, new_dev_maps);
2438 /* Cleanup old maps */
2440 goto out_no_old_maps;
2442 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2444 for (i = num_tc, tci = j * num_tc; i--; tci++) {
2445 new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
2446 map = xmap_dereference(dev_maps->attr_map[tci]);
2447 if (map && map != new_map)
2448 kfree_rcu(map, rcu);
2452 kfree_rcu(dev_maps, rcu);
2455 dev_maps = new_dev_maps;
2460 /* update Tx queue numa node */
2461 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2462 (numa_node_id >= 0) ?
2463 numa_node_id : NUMA_NO_NODE);
2469 /* removes tx-queue from unused CPUs/rx-queues */
2470 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2472 for (i = tc, tci = j * num_tc; i--; tci++)
2473 active |= remove_xps_queue(dev_maps, tci, index);
2474 if (!netif_attr_test_mask(j, mask, nr_ids) ||
2475 !netif_attr_test_online(j, online_mask, nr_ids))
2476 active |= remove_xps_queue(dev_maps, tci, index);
2477 for (i = num_tc - tc, tci++; --i; tci++)
2478 active |= remove_xps_queue(dev_maps, tci, index);
2481 /* free map if not active */
2483 reset_xps_maps(dev, dev_maps, is_rxqs_map);
2486 mutex_unlock(&xps_map_mutex);
2490 /* remove any maps that we added */
2491 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2493 for (i = num_tc, tci = j * num_tc; i--; tci++) {
2494 new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
2496 xmap_dereference(dev_maps->attr_map[tci]) :
2498 if (new_map && new_map != map)
2503 mutex_unlock(&xps_map_mutex);
2505 kfree(new_dev_maps);
2508 EXPORT_SYMBOL_GPL(__netif_set_xps_queue);
2510 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2516 ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, false);
2521 EXPORT_SYMBOL(netif_set_xps_queue);
2524 static void netdev_unbind_all_sb_channels(struct net_device *dev)
2526 struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
2528 /* Unbind any subordinate channels */
2529 while (txq-- != &dev->_tx[0]) {
2531 netdev_unbind_sb_channel(dev, txq->sb_dev);
2535 void netdev_reset_tc(struct net_device *dev)
2538 netif_reset_xps_queues_gt(dev, 0);
2540 netdev_unbind_all_sb_channels(dev);
2542 /* Reset TC configuration of device */
2544 memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
2545 memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
2547 EXPORT_SYMBOL(netdev_reset_tc);
2549 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
2551 if (tc >= dev->num_tc)
2555 netif_reset_xps_queues(dev, offset, count);
2557 dev->tc_to_txq[tc].count = count;
2558 dev->tc_to_txq[tc].offset = offset;
2561 EXPORT_SYMBOL(netdev_set_tc_queue);
2563 int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
2565 if (num_tc > TC_MAX_QUEUE)
2569 netif_reset_xps_queues_gt(dev, 0);
2571 netdev_unbind_all_sb_channels(dev);
2573 dev->num_tc = num_tc;
2576 EXPORT_SYMBOL(netdev_set_num_tc);
2578 void netdev_unbind_sb_channel(struct net_device *dev,
2579 struct net_device *sb_dev)
2581 struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
2584 netif_reset_xps_queues_gt(sb_dev, 0);
2586 memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq));
2587 memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map));
2589 while (txq-- != &dev->_tx[0]) {
2590 if (txq->sb_dev == sb_dev)
2594 EXPORT_SYMBOL(netdev_unbind_sb_channel);
2596 int netdev_bind_sb_channel_queue(struct net_device *dev,
2597 struct net_device *sb_dev,
2598 u8 tc, u16 count, u16 offset)
2600 /* Make certain the sb_dev and dev are already configured */
2601 if (sb_dev->num_tc >= 0 || tc >= dev->num_tc)
2604 /* We cannot hand out queues we don't have */
2605 if ((offset + count) > dev->real_num_tx_queues)
2608 /* Record the mapping */
2609 sb_dev->tc_to_txq[tc].count = count;
2610 sb_dev->tc_to_txq[tc].offset = offset;
2612 /* Provide a way for Tx queue to find the tc_to_txq map or
2613 * XPS map for itself.
2616 netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev;
2620 EXPORT_SYMBOL(netdev_bind_sb_channel_queue);
2622 int netdev_set_sb_channel(struct net_device *dev, u16 channel)
2624 /* Do not use a multiqueue device to represent a subordinate channel */
2625 if (netif_is_multiqueue(dev))
2628 /* We allow channels 1 - 32767 to be used for subordinate channels.
2629 * Channel 0 is meant to be "native" mode and used only to represent
2630 * the main root device. We allow writing 0 to reset the device back
2631 * to normal mode after being used as a subordinate channel.
2633 if (channel > S16_MAX)
2636 dev->num_tc = -channel;
2640 EXPORT_SYMBOL(netdev_set_sb_channel);
2643 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2644 * greater than real_num_tx_queues stale skbs on the qdisc must be flushed.
2646 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2651 disabling = txq < dev->real_num_tx_queues;
2653 if (txq < 1 || txq > dev->num_tx_queues)
2656 if (dev->reg_state == NETREG_REGISTERED ||
2657 dev->reg_state == NETREG_UNREGISTERING) {
2660 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2666 netif_setup_tc(dev, txq);
2668 dev->real_num_tx_queues = txq;
2672 qdisc_reset_all_tx_gt(dev, txq);
2674 netif_reset_xps_queues_gt(dev, txq);
2678 dev->real_num_tx_queues = txq;
2683 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2687 * netif_set_real_num_rx_queues - set actual number of RX queues used
2688 * @dev: Network device
2689 * @rxq: Actual number of RX queues
2691 * This must be called either with the rtnl_lock held or before
2692 * registration of the net device. Returns 0 on success, or a
2693 * negative error code. If called before registration, it always
2696 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2700 if (rxq < 1 || rxq > dev->num_rx_queues)
2703 if (dev->reg_state == NETREG_REGISTERED) {
2706 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2712 dev->real_num_rx_queues = rxq;
2715 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2719 * netif_get_num_default_rss_queues - default number of RSS queues
2721 * This routine should set an upper limit on the number of RSS queues
2722 * used by default by multiqueue devices.
2724 int netif_get_num_default_rss_queues(void)
2726 return is_kdump_kernel() ?
2727 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
2729 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
2731 static void __netif_reschedule(struct Qdisc *q)
2733 struct softnet_data *sd;
2734 unsigned long flags;
2736 local_irq_save(flags);
2737 sd = this_cpu_ptr(&softnet_data);
2738 q->next_sched = NULL;
2739 *sd->output_queue_tailp = q;
2740 sd->output_queue_tailp = &q->next_sched;
2741 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2742 local_irq_restore(flags);
2745 void __netif_schedule(struct Qdisc *q)
2747 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
2748 __netif_reschedule(q);
2750 EXPORT_SYMBOL(__netif_schedule);
2752 struct dev_kfree_skb_cb {
2753 enum skb_free_reason reason;
2756 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
2758 return (struct dev_kfree_skb_cb *)skb->cb;
2761 void netif_schedule_queue(struct netdev_queue *txq)
2764 if (!(txq->state & QUEUE_STATE_ANY_XOFF)) {
2765 struct Qdisc *q = rcu_dereference(txq->qdisc);
2767 __netif_schedule(q);
2771 EXPORT_SYMBOL(netif_schedule_queue);
2773 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
2775 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
2779 q = rcu_dereference(dev_queue->qdisc);
2780 __netif_schedule(q);
2784 EXPORT_SYMBOL(netif_tx_wake_queue);
2786 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
2788 unsigned long flags;
2793 if (likely(refcount_read(&skb->users) == 1)) {
2795 refcount_set(&skb->users, 0);
2796 } else if (likely(!refcount_dec_and_test(&skb->users))) {
2799 get_kfree_skb_cb(skb)->reason = reason;
2800 local_irq_save(flags);
2801 skb->next = __this_cpu_read(softnet_data.completion_queue);
2802 __this_cpu_write(softnet_data.completion_queue, skb);
2803 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2804 local_irq_restore(flags);
2806 EXPORT_SYMBOL(__dev_kfree_skb_irq);
2808 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
2810 if (in_irq() || irqs_disabled())
2811 __dev_kfree_skb_irq(skb, reason);
2815 EXPORT_SYMBOL(__dev_kfree_skb_any);
2819 * netif_device_detach - mark device as removed
2820 * @dev: network device
2822 * Mark device as removed from system and therefore no longer available.
2824 void netif_device_detach(struct net_device *dev)
2826 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
2827 netif_running(dev)) {
2828 netif_tx_stop_all_queues(dev);
2831 EXPORT_SYMBOL(netif_device_detach);
2834 * netif_device_attach - mark device as attached
2835 * @dev: network device
2837 * Mark device as attached from system and restart if needed.
2839 void netif_device_attach(struct net_device *dev)
2841 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2842 netif_running(dev)) {
2843 netif_tx_wake_all_queues(dev);
2844 __netdev_watchdog_up(dev);
2847 EXPORT_SYMBOL(netif_device_attach);
2850 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2851 * to be used as a distribution range.
2853 static u16 skb_tx_hash(const struct net_device *dev,
2854 const struct net_device *sb_dev,
2855 struct sk_buff *skb)
2859 u16 qcount = dev->real_num_tx_queues;
2862 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2864 qoffset = sb_dev->tc_to_txq[tc].offset;
2865 qcount = sb_dev->tc_to_txq[tc].count;
2868 if (skb_rx_queue_recorded(skb)) {
2869 hash = skb_get_rx_queue(skb);
2870 while (unlikely(hash >= qcount))
2872 return hash + qoffset;
2875 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
2878 static void skb_warn_bad_offload(const struct sk_buff *skb)
2880 static const netdev_features_t null_features;
2881 struct net_device *dev = skb->dev;
2882 const char *name = "";
2884 if (!net_ratelimit())
2888 if (dev->dev.parent)
2889 name = dev_driver_string(dev->dev.parent);
2891 name = netdev_name(dev);
2893 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2894 "gso_type=%d ip_summed=%d\n",
2895 name, dev ? &dev->features : &null_features,
2896 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2897 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2898 skb_shinfo(skb)->gso_type, skb->ip_summed);
2902 * Invalidate hardware checksum when packet is to be mangled, and
2903 * complete checksum manually on outgoing path.
2905 int skb_checksum_help(struct sk_buff *skb)
2908 int ret = 0, offset;
2910 if (skb->ip_summed == CHECKSUM_COMPLETE)
2911 goto out_set_summed;
2913 if (unlikely(skb_shinfo(skb)->gso_size)) {
2914 skb_warn_bad_offload(skb);
2918 /* Before computing a checksum, we should make sure no frag could
2919 * be modified by an external entity : checksum could be wrong.
2921 if (skb_has_shared_frag(skb)) {
2922 ret = __skb_linearize(skb);
2927 offset = skb_checksum_start_offset(skb);
2928 BUG_ON(offset >= skb_headlen(skb));
2929 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2931 offset += skb->csum_offset;
2932 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2934 if (skb_cloned(skb) &&
2935 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2936 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2941 *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;
2943 skb->ip_summed = CHECKSUM_NONE;
2947 EXPORT_SYMBOL(skb_checksum_help);
2949 int skb_crc32c_csum_help(struct sk_buff *skb)
2952 int ret = 0, offset, start;
2954 if (skb->ip_summed != CHECKSUM_PARTIAL)
2957 if (unlikely(skb_is_gso(skb)))
2960 /* Before computing a checksum, we should make sure no frag could
2961 * be modified by an external entity : checksum could be wrong.
2963 if (unlikely(skb_has_shared_frag(skb))) {
2964 ret = __skb_linearize(skb);
2968 start = skb_checksum_start_offset(skb);
2969 offset = start + offsetof(struct sctphdr, checksum);
2970 if (WARN_ON_ONCE(offset >= skb_headlen(skb))) {
2974 if (skb_cloned(skb) &&
2975 !skb_clone_writable(skb, offset + sizeof(__le32))) {
2976 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2980 crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start,
2981 skb->len - start, ~(__u32)0,
2983 *(__le32 *)(skb->data + offset) = crc32c_csum;
2984 skb->ip_summed = CHECKSUM_NONE;
2985 skb->csum_not_inet = 0;
2990 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
2992 __be16 type = skb->protocol;
2994 /* Tunnel gso handlers can set protocol to ethernet. */
2995 if (type == htons(ETH_P_TEB)) {
2998 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
3001 eth = (struct ethhdr *)skb->data;
3002 type = eth->h_proto;
3005 return __vlan_get_protocol(skb, type, depth);
3009 * skb_mac_gso_segment - mac layer segmentation handler.
3010 * @skb: buffer to segment
3011 * @features: features for the output path (see dev->features)
3013 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
3014 netdev_features_t features)
3016 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
3017 struct packet_offload *ptype;
3018 int vlan_depth = skb->mac_len;
3019 __be16 type = skb_network_protocol(skb, &vlan_depth);
3021 if (unlikely(!type))
3022 return ERR_PTR(-EINVAL);
3024 __skb_pull(skb, vlan_depth);
3027 list_for_each_entry_rcu(ptype, &offload_base, list) {
3028 if (ptype->type == type && ptype->callbacks.gso_segment) {
3029 segs = ptype->callbacks.gso_segment(skb, features);
3035 __skb_push(skb, skb->data - skb_mac_header(skb));
3039 EXPORT_SYMBOL(skb_mac_gso_segment);
3042 /* openvswitch calls this on rx path, so we need a different check.
3044 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
3047 return skb->ip_summed != CHECKSUM_PARTIAL &&
3048 skb->ip_summed != CHECKSUM_UNNECESSARY;
3050 return skb->ip_summed == CHECKSUM_NONE;
3054 * __skb_gso_segment - Perform segmentation on skb.
3055 * @skb: buffer to segment
3056 * @features: features for the output path (see dev->features)
3057 * @tx_path: whether it is called in TX path
3059 * This function segments the given skb and returns a list of segments.
3061 * It may return NULL if the skb requires no segmentation. This is
3062 * only possible when GSO is used for verifying header integrity.
3064 * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
3066 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
3067 netdev_features_t features, bool tx_path)
3069 struct sk_buff *segs;
3071 if (unlikely(skb_needs_check(skb, tx_path))) {
3074 /* We're going to init ->check field in TCP or UDP header */
3075 err = skb_cow_head(skb, 0);
3077 return ERR_PTR(err);
3080 /* Only report GSO partial support if it will enable us to
3081 * support segmentation on this frame without needing additional
3084 if (features & NETIF_F_GSO_PARTIAL) {
3085 netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
3086 struct net_device *dev = skb->dev;
3088 partial_features |= dev->features & dev->gso_partial_features;
3089 if (!skb_gso_ok(skb, features | partial_features))
3090 features &= ~NETIF_F_GSO_PARTIAL;
3093 BUILD_BUG_ON(SKB_SGO_CB_OFFSET +
3094 sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
3096 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
3097 SKB_GSO_CB(skb)->encap_level = 0;
3099 skb_reset_mac_header(skb);
3100 skb_reset_mac_len(skb);
3102 segs = skb_mac_gso_segment(skb, features);
3104 if (unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs)))
3105 skb_warn_bad_offload(skb);
3109 EXPORT_SYMBOL(__skb_gso_segment);
3111 /* Take action when hardware reception checksum errors are detected. */
3113 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
3115 if (net_ratelimit()) {
3116 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
3118 pr_err("dev features: %pNF\n", &dev->features);
3119 pr_err("skb len=%u data_len=%u pkt_type=%u gso_size=%u gso_type=%u nr_frags=%u ip_summed=%u csum=%x csum_complete_sw=%d csum_valid=%d csum_level=%u\n",
3120 skb->len, skb->data_len, skb->pkt_type,
3121 skb_shinfo(skb)->gso_size, skb_shinfo(skb)->gso_type,
3122 skb_shinfo(skb)->nr_frags, skb->ip_summed, skb->csum,
3123 skb->csum_complete_sw, skb->csum_valid, skb->csum_level);
3127 EXPORT_SYMBOL(netdev_rx_csum_fault);
3130 /* XXX: check that highmem exists at all on the given machine. */
3131 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
3133 #ifdef CONFIG_HIGHMEM
3136 if (!(dev->features & NETIF_F_HIGHDMA)) {
3137 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
3138 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
3140 if (PageHighMem(skb_frag_page(frag)))
3148 /* If MPLS offload request, verify we are testing hardware MPLS features
3149 * instead of standard features for the netdev.
3151 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
3152 static netdev_features_t net_mpls_features(struct sk_buff *skb,
3153 netdev_features_t features,
3156 if (eth_p_mpls(type))
3157 features &= skb->dev->mpls_features;
3162 static netdev_features_t net_mpls_features(struct sk_buff *skb,
3163 netdev_features_t features,
3170 static netdev_features_t harmonize_features(struct sk_buff *skb,
3171 netdev_features_t features)
3176 type = skb_network_protocol(skb, &tmp);
3177 features = net_mpls_features(skb, features, type);
3179 if (skb->ip_summed != CHECKSUM_NONE &&
3180 !can_checksum_protocol(features, type)) {
3181 features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
3183 if (illegal_highdma(skb->dev, skb))
3184 features &= ~NETIF_F_SG;
3189 netdev_features_t passthru_features_check(struct sk_buff *skb,
3190 struct net_device *dev,
3191 netdev_features_t features)
3195 EXPORT_SYMBOL(passthru_features_check);
3197 static netdev_features_t dflt_features_check(struct sk_buff *skb,
3198 struct net_device *dev,
3199 netdev_features_t features)
3201 return vlan_features_check(skb, features);
3204 static netdev_features_t gso_features_check(const struct sk_buff *skb,
3205 struct net_device *dev,
3206 netdev_features_t features)
3208 u16 gso_segs = skb_shinfo(skb)->gso_segs;
3210 if (gso_segs > dev->gso_max_segs)
3211 return features & ~NETIF_F_GSO_MASK;
3213 /* Support for GSO partial features requires software
3214 * intervention before we can actually process the packets
3215 * so we need to strip support for any partial features now
3216 * and we can pull them back in after we have partially
3217 * segmented the frame.
3219 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
3220 features &= ~dev->gso_partial_features;
3222 /* Make sure to clear the IPv4 ID mangling feature if the
3223 * IPv4 header has the potential to be fragmented.
3225 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
3226 struct iphdr *iph = skb->encapsulation ?
3227 inner_ip_hdr(skb) : ip_hdr(skb);
3229 if (!(iph->frag_off & htons(IP_DF)))
3230 features &= ~NETIF_F_TSO_MANGLEID;
3236 netdev_features_t netif_skb_features(struct sk_buff *skb)
3238 struct net_device *dev = skb->dev;
3239 netdev_features_t features = dev->features;
3241 if (skb_is_gso(skb))
3242 features = gso_features_check(skb, dev, features);
3244 /* If encapsulation offload request, verify we are testing
3245 * hardware encapsulation features instead of standard
3246 * features for the netdev
3248 if (skb->encapsulation)
3249 features &= dev->hw_enc_features;
3251 if (skb_vlan_tagged(skb))
3252 features = netdev_intersect_features(features,
3253 dev->vlan_features |
3254 NETIF_F_HW_VLAN_CTAG_TX |
3255 NETIF_F_HW_VLAN_STAG_TX);
3257 if (dev->netdev_ops->ndo_features_check)
3258 features &= dev->netdev_ops->ndo_features_check(skb, dev,
3261 features &= dflt_features_check(skb, dev, features);
3263 return harmonize_features(skb, features);
3265 EXPORT_SYMBOL(netif_skb_features);
3267 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
3268 struct netdev_queue *txq, bool more)
3273 if (dev_nit_active(dev))
3274 dev_queue_xmit_nit(skb, dev);
3277 trace_net_dev_start_xmit(skb, dev);
3278 rc = netdev_start_xmit(skb, dev, txq, more);
3279 trace_net_dev_xmit(skb, rc, dev, len);
3284 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
3285 struct netdev_queue *txq, int *ret)
3287 struct sk_buff *skb = first;
3288 int rc = NETDEV_TX_OK;
3291 struct sk_buff *next = skb->next;
3293 skb_mark_not_on_list(skb);
3294 rc = xmit_one(skb, dev, txq, next != NULL);
3295 if (unlikely(!dev_xmit_complete(rc))) {
3301 if (netif_tx_queue_stopped(txq) && skb) {
3302 rc = NETDEV_TX_BUSY;
3312 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
3313 netdev_features_t features)
3315 if (skb_vlan_tag_present(skb) &&
3316 !vlan_hw_offload_capable(features, skb->vlan_proto))
3317 skb = __vlan_hwaccel_push_inside(skb);
3321 int skb_csum_hwoffload_help(struct sk_buff *skb,
3322 const netdev_features_t features)
3324 if (unlikely(skb->csum_not_inet))
3325 return !!(features & NETIF_F_SCTP_CRC) ? 0 :
3326 skb_crc32c_csum_help(skb);
3328 return !!(features & NETIF_F_CSUM_MASK) ? 0 : skb_checksum_help(skb);
3330 EXPORT_SYMBOL(skb_csum_hwoffload_help);
3332 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again)
3334 netdev_features_t features;
3336 features = netif_skb_features(skb);
3337 skb = validate_xmit_vlan(skb, features);
3341 skb = sk_validate_xmit_skb(skb, dev);
3345 if (netif_needs_gso(skb, features)) {
3346 struct sk_buff *segs;
3348 segs = skb_gso_segment(skb, features);
3356 if (skb_needs_linearize(skb, features) &&
3357 __skb_linearize(skb))
3360 /* If packet is not checksummed and device does not
3361 * support checksumming for this protocol, complete
3362 * checksumming here.
3364 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3365 if (skb->encapsulation)
3366 skb_set_inner_transport_header(skb,
3367 skb_checksum_start_offset(skb));
3369 skb_set_transport_header(skb,
3370 skb_checksum_start_offset(skb));
3371 if (skb_csum_hwoffload_help(skb, features))
3376 skb = validate_xmit_xfrm(skb, features, again);
3383 atomic_long_inc(&dev->tx_dropped);
3387 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again)
3389 struct sk_buff *next, *head = NULL, *tail;
3391 for (; skb != NULL; skb = next) {
3393 skb_mark_not_on_list(skb);
3395 /* in case skb wont be segmented, point to itself */
3398 skb = validate_xmit_skb(skb, dev, again);
3406 /* If skb was segmented, skb->prev points to
3407 * the last segment. If not, it still contains skb.
3413 EXPORT_SYMBOL_GPL(validate_xmit_skb_list);
3415 static void qdisc_pkt_len_init(struct sk_buff *skb)
3417 const struct skb_shared_info *shinfo = skb_shinfo(skb);
3419 qdisc_skb_cb(skb)->pkt_len = skb->len;
3421 /* To get more precise estimation of bytes sent on wire,
3422 * we add to pkt_len the headers size of all segments
3424 if (shinfo->gso_size && skb_transport_header_was_set(skb)) {
3425 unsigned int hdr_len;
3426 u16 gso_segs = shinfo->gso_segs;
3428 /* mac layer + network layer */
3429 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
3431 /* + transport layer */
3432 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) {
3433 const struct tcphdr *th;
3434 struct tcphdr _tcphdr;
3436 th = skb_header_pointer(skb, skb_transport_offset(skb),
3437 sizeof(_tcphdr), &_tcphdr);
3439 hdr_len += __tcp_hdrlen(th);
3441 struct udphdr _udphdr;
3443 if (skb_header_pointer(skb, skb_transport_offset(skb),
3444 sizeof(_udphdr), &_udphdr))
3445 hdr_len += sizeof(struct udphdr);
3448 if (shinfo->gso_type & SKB_GSO_DODGY)
3449 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
3452 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
3456 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
3457 struct net_device *dev,
3458 struct netdev_queue *txq)
3460 spinlock_t *root_lock = qdisc_lock(q);
3461 struct sk_buff *to_free = NULL;
3465 qdisc_calculate_pkt_len(skb, q);
3467 if (q->flags & TCQ_F_NOLOCK) {
3468 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
3469 __qdisc_drop(skb, &to_free);
3471 } else if ((q->flags & TCQ_F_CAN_BYPASS) && q->empty &&
3472 qdisc_run_begin(q)) {
3473 qdisc_bstats_cpu_update(q, skb);
3475 if (sch_direct_xmit(skb, q, dev, txq, NULL, true))
3479 rc = NET_XMIT_SUCCESS;
3481 rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
3485 if (unlikely(to_free))
3486 kfree_skb_list(to_free);
3491 * Heuristic to force contended enqueues to serialize on a
3492 * separate lock before trying to get qdisc main lock.
3493 * This permits qdisc->running owner to get the lock more
3494 * often and dequeue packets faster.
3496 contended = qdisc_is_running(q);
3497 if (unlikely(contended))
3498 spin_lock(&q->busylock);
3500 spin_lock(root_lock);
3501 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
3502 __qdisc_drop(skb, &to_free);
3504 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
3505 qdisc_run_begin(q)) {
3507 * This is a work-conserving queue; there are no old skbs
3508 * waiting to be sent out; and the qdisc is not running -
3509 * xmit the skb directly.
3512 qdisc_bstats_update(q, skb);
3514 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
3515 if (unlikely(contended)) {
3516 spin_unlock(&q->busylock);
3523 rc = NET_XMIT_SUCCESS;
3525 rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
3526 if (qdisc_run_begin(q)) {
3527 if (unlikely(contended)) {
3528 spin_unlock(&q->busylock);
3535 spin_unlock(root_lock);
3536 if (unlikely(to_free))
3537 kfree_skb_list(to_free);
3538 if (unlikely(contended))
3539 spin_unlock(&q->busylock);
3543 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3544 static void skb_update_prio(struct sk_buff *skb)
3546 const struct netprio_map *map;
3547 const struct sock *sk;
3548 unsigned int prioidx;
3552 map = rcu_dereference_bh(skb->dev->priomap);
3555 sk = skb_to_full_sk(skb);
3559 prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data);
3561 if (prioidx < map->priomap_len)
3562 skb->priority = map->priomap[prioidx];
3565 #define skb_update_prio(skb)
3568 DEFINE_PER_CPU(int, xmit_recursion);
3569 EXPORT_SYMBOL(xmit_recursion);
3572 * dev_loopback_xmit - loop back @skb
3573 * @net: network namespace this loopback is happening in
3574 * @sk: sk needed to be a netfilter okfn
3575 * @skb: buffer to transmit
3577 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
3579 skb_reset_mac_header(skb);
3580 __skb_pull(skb, skb_network_offset(skb));
3581 skb->pkt_type = PACKET_LOOPBACK;
3582 skb->ip_summed = CHECKSUM_UNNECESSARY;
3583 WARN_ON(!skb_dst(skb));
3588 EXPORT_SYMBOL(dev_loopback_xmit);
3590 #ifdef CONFIG_NET_EGRESS
3591 static struct sk_buff *
3592 sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
3594 struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress);
3595 struct tcf_result cl_res;
3600 /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */
3601 mini_qdisc_bstats_cpu_update(miniq, skb);
3603 switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) {
3605 case TC_ACT_RECLASSIFY:
3606 skb->tc_index = TC_H_MIN(cl_res.classid);
3609 mini_qdisc_qstats_cpu_drop(miniq);
3610 *ret = NET_XMIT_DROP;
3616 *ret = NET_XMIT_SUCCESS;
3619 case TC_ACT_REDIRECT:
3620 /* No need to push/pop skb's mac_header here on egress! */
3621 skb_do_redirect(skb);
3622 *ret = NET_XMIT_SUCCESS;
3630 #endif /* CONFIG_NET_EGRESS */
3633 static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb,
3634 struct xps_dev_maps *dev_maps, unsigned int tci)
3636 struct xps_map *map;
3637 int queue_index = -1;
3641 tci += netdev_get_prio_tc_map(dev, skb->priority);
3644 map = rcu_dereference(dev_maps->attr_map[tci]);
3647 queue_index = map->queues[0];
3649 queue_index = map->queues[reciprocal_scale(
3650 skb_get_hash(skb), map->len)];
3651 if (unlikely(queue_index >= dev->real_num_tx_queues))
3658 static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev,
3659 struct sk_buff *skb)
3662 struct xps_dev_maps *dev_maps;
3663 struct sock *sk = skb->sk;
3664 int queue_index = -1;
3666 if (!static_key_false(&xps_needed))
3670 if (!static_key_false(&xps_rxqs_needed))
3673 dev_maps = rcu_dereference(sb_dev->xps_rxqs_map);
3675 int tci = sk_rx_queue_get(sk);
3677 if (tci >= 0 && tci < dev->num_rx_queues)
3678 queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
3683 if (queue_index < 0) {
3684 dev_maps = rcu_dereference(sb_dev->xps_cpus_map);
3686 unsigned int tci = skb->sender_cpu - 1;
3688 queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
3700 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb,
3701 struct net_device *sb_dev)
3705 EXPORT_SYMBOL(dev_pick_tx_zero);
3707 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb,
3708 struct net_device *sb_dev)
3710 return (u16)raw_smp_processor_id() % dev->real_num_tx_queues;
3712 EXPORT_SYMBOL(dev_pick_tx_cpu_id);
3714 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
3715 struct net_device *sb_dev)
3717 struct sock *sk = skb->sk;
3718 int queue_index = sk_tx_queue_get(sk);
3720 sb_dev = sb_dev ? : dev;
3722 if (queue_index < 0 || skb->ooo_okay ||
3723 queue_index >= dev->real_num_tx_queues) {
3724 int new_index = get_xps_queue(dev, sb_dev, skb);
3727 new_index = skb_tx_hash(dev, sb_dev, skb);
3729 if (queue_index != new_index && sk &&
3731 rcu_access_pointer(sk->sk_dst_cache))
3732 sk_tx_queue_set(sk, new_index);
3734 queue_index = new_index;
3739 EXPORT_SYMBOL(netdev_pick_tx);
3741 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev,
3742 struct sk_buff *skb,
3743 struct net_device *sb_dev)
3745 int queue_index = 0;
3748 u32 sender_cpu = skb->sender_cpu - 1;
3750 if (sender_cpu >= (u32)NR_CPUS)
3751 skb->sender_cpu = raw_smp_processor_id() + 1;
3754 if (dev->real_num_tx_queues != 1) {
3755 const struct net_device_ops *ops = dev->netdev_ops;
3757 if (ops->ndo_select_queue)
3758 queue_index = ops->ndo_select_queue(dev, skb, sb_dev);
3760 queue_index = netdev_pick_tx(dev, skb, sb_dev);
3762 queue_index = netdev_cap_txqueue(dev, queue_index);
3765 skb_set_queue_mapping(skb, queue_index);
3766 return netdev_get_tx_queue(dev, queue_index);
3770 * __dev_queue_xmit - transmit a buffer
3771 * @skb: buffer to transmit
3772 * @sb_dev: suboordinate device used for L2 forwarding offload
3774 * Queue a buffer for transmission to a network device. The caller must
3775 * have set the device and priority and built the buffer before calling
3776 * this function. The function can be called from an interrupt.
3778 * A negative errno code is returned on a failure. A success does not
3779 * guarantee the frame will be transmitted as it may be dropped due
3780 * to congestion or traffic shaping.
3782 * -----------------------------------------------------------------------------------
3783 * I notice this method can also return errors from the queue disciplines,
3784 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3787 * Regardless of the return value, the skb is consumed, so it is currently
3788 * difficult to retry a send to this method. (You can bump the ref count
3789 * before sending to hold a reference for retry if you are careful.)
3791 * When calling this method, interrupts MUST be enabled. This is because
3792 * the BH enable code must have IRQs enabled so that it will not deadlock.
3795 static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev)
3797 struct net_device *dev = skb->dev;
3798 struct netdev_queue *txq;
3803 skb_reset_mac_header(skb);
3805 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
3806 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
3808 /* Disable soft irqs for various locks below. Also
3809 * stops preemption for RCU.
3813 skb_update_prio(skb);
3815 qdisc_pkt_len_init(skb);
3816 #ifdef CONFIG_NET_CLS_ACT
3817 skb->tc_at_ingress = 0;
3818 # ifdef CONFIG_NET_EGRESS
3819 if (static_branch_unlikely(&egress_needed_key)) {
3820 skb = sch_handle_egress(skb, &rc, dev);
3826 /* If device/qdisc don't need skb->dst, release it right now while
3827 * its hot in this cpu cache.
3829 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
3834 txq = netdev_core_pick_tx(dev, skb, sb_dev);
3835 q = rcu_dereference_bh(txq->qdisc);
3837 trace_net_dev_queue(skb);
3839 rc = __dev_xmit_skb(skb, q, dev, txq);
3843 /* The device has no queue. Common case for software devices:
3844 * loopback, all the sorts of tunnels...
3846 * Really, it is unlikely that netif_tx_lock protection is necessary
3847 * here. (f.e. loopback and IP tunnels are clean ignoring statistics
3849 * However, it is possible, that they rely on protection
3852 * Check this and shot the lock. It is not prone from deadlocks.
3853 *Either shot noqueue qdisc, it is even simpler 8)
3855 if (dev->flags & IFF_UP) {
3856 int cpu = smp_processor_id(); /* ok because BHs are off */
3858 if (txq->xmit_lock_owner != cpu) {
3859 if (unlikely(__this_cpu_read(xmit_recursion) >
3860 XMIT_RECURSION_LIMIT))
3861 goto recursion_alert;
3863 skb = validate_xmit_skb(skb, dev, &again);
3867 HARD_TX_LOCK(dev, txq, cpu);
3869 if (!netif_xmit_stopped(txq)) {
3870 __this_cpu_inc(xmit_recursion);
3871 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
3872 __this_cpu_dec(xmit_recursion);
3873 if (dev_xmit_complete(rc)) {
3874 HARD_TX_UNLOCK(dev, txq);
3878 HARD_TX_UNLOCK(dev, txq);
3879 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3882 /* Recursion is detected! It is possible,
3886 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3892 rcu_read_unlock_bh();
3894 atomic_long_inc(&dev->tx_dropped);
3895 kfree_skb_list(skb);
3898 rcu_read_unlock_bh();
3902 int dev_queue_xmit(struct sk_buff *skb)
3904 return __dev_queue_xmit(skb, NULL);
3906 EXPORT_SYMBOL(dev_queue_xmit);
3908 int dev_queue_xmit_accel(struct sk_buff *skb, struct net_device *sb_dev)
3910 return __dev_queue_xmit(skb, sb_dev);
3912 EXPORT_SYMBOL(dev_queue_xmit_accel);
3914 int dev_direct_xmit(struct sk_buff *skb, u16 queue_id)
3916 struct net_device *dev = skb->dev;
3917 struct sk_buff *orig_skb = skb;
3918 struct netdev_queue *txq;
3919 int ret = NETDEV_TX_BUSY;
3922 if (unlikely(!netif_running(dev) ||
3923 !netif_carrier_ok(dev)))
3926 skb = validate_xmit_skb_list(skb, dev, &again);
3927 if (skb != orig_skb)
3930 skb_set_queue_mapping(skb, queue_id);
3931 txq = skb_get_tx_queue(dev, skb);
3935 HARD_TX_LOCK(dev, txq, smp_processor_id());
3936 if (!netif_xmit_frozen_or_drv_stopped(txq))
3937 ret = netdev_start_xmit(skb, dev, txq, false);
3938 HARD_TX_UNLOCK(dev, txq);
3942 if (!dev_xmit_complete(ret))
3947 atomic_long_inc(&dev->tx_dropped);
3948 kfree_skb_list(skb);
3949 return NET_XMIT_DROP;
3951 EXPORT_SYMBOL(dev_direct_xmit);
3953 /*************************************************************************
3955 *************************************************************************/
3957 int netdev_max_backlog __read_mostly = 1000;
3958 EXPORT_SYMBOL(netdev_max_backlog);
3960 int netdev_tstamp_prequeue __read_mostly = 1;
3961 int netdev_budget __read_mostly = 300;
3962 unsigned int __read_mostly netdev_budget_usecs = 2000;
3963 int weight_p __read_mostly = 64; /* old backlog weight */
3964 int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */
3965 int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */
3966 int dev_rx_weight __read_mostly = 64;
3967 int dev_tx_weight __read_mostly = 64;
3969 /* Called with irq disabled */
3970 static inline void ____napi_schedule(struct softnet_data *sd,
3971 struct napi_struct *napi)
3973 list_add_tail(&napi->poll_list, &sd->poll_list);
3974 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3979 /* One global table that all flow-based protocols share. */
3980 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
3981 EXPORT_SYMBOL(rps_sock_flow_table);
3982 u32 rps_cpu_mask __read_mostly;
3983 EXPORT_SYMBOL(rps_cpu_mask);
3985 struct static_key_false rps_needed __read_mostly;
3986 EXPORT_SYMBOL(rps_needed);
3987 struct static_key_false rfs_needed __read_mostly;
3988 EXPORT_SYMBOL(rfs_needed);
3990 static struct rps_dev_flow *
3991 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3992 struct rps_dev_flow *rflow, u16 next_cpu)
3994 if (next_cpu < nr_cpu_ids) {
3995 #ifdef CONFIG_RFS_ACCEL
3996 struct netdev_rx_queue *rxqueue;
3997 struct rps_dev_flow_table *flow_table;
3998 struct rps_dev_flow *old_rflow;
4003 /* Should we steer this flow to a different hardware queue? */
4004 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
4005 !(dev->features & NETIF_F_NTUPLE))
4007 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
4008 if (rxq_index == skb_get_rx_queue(skb))
4011 rxqueue = dev->_rx + rxq_index;
4012 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4015 flow_id = skb_get_hash(skb) & flow_table->mask;
4016 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
4017 rxq_index, flow_id);
4021 rflow = &flow_table->flows[flow_id];
4023 if (old_rflow->filter == rflow->filter)
4024 old_rflow->filter = RPS_NO_FILTER;
4028 per_cpu(softnet_data, next_cpu).input_queue_head;
4031 rflow->cpu = next_cpu;
4036 * get_rps_cpu is called from netif_receive_skb and returns the target
4037 * CPU from the RPS map of the receiving queue for a given skb.
4038 * rcu_read_lock must be held on entry.
4040 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
4041 struct rps_dev_flow **rflowp)
4043 const struct rps_sock_flow_table *sock_flow_table;
4044 struct netdev_rx_queue *rxqueue = dev->_rx;
4045 struct rps_dev_flow_table *flow_table;
4046 struct rps_map *map;
4051 if (skb_rx_queue_recorded(skb)) {
4052 u16 index = skb_get_rx_queue(skb);
4054 if (unlikely(index >= dev->real_num_rx_queues)) {
4055 WARN_ONCE(dev->real_num_rx_queues > 1,
4056 "%s received packet on queue %u, but number "
4057 "of RX queues is %u\n",
4058 dev->name, index, dev->real_num_rx_queues);
4064 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
4066 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4067 map = rcu_dereference(rxqueue->rps_map);
4068 if (!flow_table && !map)
4071 skb_reset_network_header(skb);
4072 hash = skb_get_hash(skb);
4076 sock_flow_table = rcu_dereference(rps_sock_flow_table);
4077 if (flow_table && sock_flow_table) {
4078 struct rps_dev_flow *rflow;
4082 /* First check into global flow table if there is a match */
4083 ident = sock_flow_table->ents[hash & sock_flow_table->mask];
4084 if ((ident ^ hash) & ~rps_cpu_mask)
4087 next_cpu = ident & rps_cpu_mask;
4089 /* OK, now we know there is a match,
4090 * we can look at the local (per receive queue) flow table
4092 rflow = &flow_table->flows[hash & flow_table->mask];
4096 * If the desired CPU (where last recvmsg was done) is
4097 * different from current CPU (one in the rx-queue flow
4098 * table entry), switch if one of the following holds:
4099 * - Current CPU is unset (>= nr_cpu_ids).
4100 * - Current CPU is offline.
4101 * - The current CPU's queue tail has advanced beyond the
4102 * last packet that was enqueued using this table entry.
4103 * This guarantees that all previous packets for the flow
4104 * have been dequeued, thus preserving in order delivery.
4106 if (unlikely(tcpu != next_cpu) &&
4107 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
4108 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
4109 rflow->last_qtail)) >= 0)) {
4111 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
4114 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
4124 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
4125 if (cpu_online(tcpu)) {
4135 #ifdef CONFIG_RFS_ACCEL
4138 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
4139 * @dev: Device on which the filter was set
4140 * @rxq_index: RX queue index
4141 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
4142 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
4144 * Drivers that implement ndo_rx_flow_steer() should periodically call
4145 * this function for each installed filter and remove the filters for
4146 * which it returns %true.
4148 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
4149 u32 flow_id, u16 filter_id)
4151 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
4152 struct rps_dev_flow_table *flow_table;
4153 struct rps_dev_flow *rflow;
4158 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4159 if (flow_table && flow_id <= flow_table->mask) {
4160 rflow = &flow_table->flows[flow_id];
4161 cpu = READ_ONCE(rflow->cpu);
4162 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
4163 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
4164 rflow->last_qtail) <
4165 (int)(10 * flow_table->mask)))
4171 EXPORT_SYMBOL(rps_may_expire_flow);
4173 #endif /* CONFIG_RFS_ACCEL */
4175 /* Called from hardirq (IPI) context */
4176 static void rps_trigger_softirq(void *data)
4178 struct softnet_data *sd = data;
4180 ____napi_schedule(sd, &sd->backlog);
4184 #endif /* CONFIG_RPS */
4187 * Check if this softnet_data structure is another cpu one
4188 * If yes, queue it to our IPI list and return 1
4191 static int rps_ipi_queued(struct softnet_data *sd)
4194 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
4197 sd->rps_ipi_next = mysd->rps_ipi_list;
4198 mysd->rps_ipi_list = sd;
4200 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4203 #endif /* CONFIG_RPS */
4207 #ifdef CONFIG_NET_FLOW_LIMIT
4208 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
4211 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
4213 #ifdef CONFIG_NET_FLOW_LIMIT
4214 struct sd_flow_limit *fl;
4215 struct softnet_data *sd;
4216 unsigned int old_flow, new_flow;
4218 if (qlen < (netdev_max_backlog >> 1))
4221 sd = this_cpu_ptr(&softnet_data);
4224 fl = rcu_dereference(sd->flow_limit);
4226 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
4227 old_flow = fl->history[fl->history_head];
4228 fl->history[fl->history_head] = new_flow;
4231 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
4233 if (likely(fl->buckets[old_flow]))
4234 fl->buckets[old_flow]--;
4236 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
4248 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
4249 * queue (may be a remote CPU queue).
4251 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
4252 unsigned int *qtail)
4254 struct softnet_data *sd;
4255 unsigned long flags;
4258 sd = &per_cpu(softnet_data, cpu);
4260 local_irq_save(flags);
4263 if (!netif_running(skb->dev))
4265 qlen = skb_queue_len(&sd->input_pkt_queue);
4266 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
4269 __skb_queue_tail(&sd->input_pkt_queue, skb);
4270 input_queue_tail_incr_save(sd, qtail);
4272 local_irq_restore(flags);
4273 return NET_RX_SUCCESS;
4276 /* Schedule NAPI for backlog device
4277 * We can use non atomic operation since we own the queue lock
4279 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
4280 if (!rps_ipi_queued(sd))
4281 ____napi_schedule(sd, &sd->backlog);
4290 local_irq_restore(flags);
4292 atomic_long_inc(&skb->dev->rx_dropped);
4297 static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb)
4299 struct net_device *dev = skb->dev;
4300 struct netdev_rx_queue *rxqueue;
4304 if (skb_rx_queue_recorded(skb)) {
4305 u16 index = skb_get_rx_queue(skb);
4307 if (unlikely(index >= dev->real_num_rx_queues)) {
4308 WARN_ONCE(dev->real_num_rx_queues > 1,
4309 "%s received packet on queue %u, but number "
4310 "of RX queues is %u\n",
4311 dev->name, index, dev->real_num_rx_queues);
4313 return rxqueue; /* Return first rxqueue */
4320 static u32 netif_receive_generic_xdp(struct sk_buff *skb,
4321 struct xdp_buff *xdp,
4322 struct bpf_prog *xdp_prog)
4324 struct netdev_rx_queue *rxqueue;
4325 void *orig_data, *orig_data_end;
4326 u32 metalen, act = XDP_DROP;
4327 __be16 orig_eth_type;
4333 /* Reinjected packets coming from act_mirred or similar should
4334 * not get XDP generic processing.
4336 if (skb_cloned(skb) || skb_is_tc_redirected(skb))
4339 /* XDP packets must be linear and must have sufficient headroom
4340 * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also
4341 * native XDP provides, thus we need to do it here as well.
4343 if (skb_is_nonlinear(skb) ||
4344 skb_headroom(skb) < XDP_PACKET_HEADROOM) {
4345 int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb);
4346 int troom = skb->tail + skb->data_len - skb->end;
4348 /* In case we have to go down the path and also linearize,
4349 * then lets do the pskb_expand_head() work just once here.
4351 if (pskb_expand_head(skb,
4352 hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0,
4353 troom > 0 ? troom + 128 : 0, GFP_ATOMIC))
4355 if (skb_linearize(skb))
4359 /* The XDP program wants to see the packet starting at the MAC
4362 mac_len = skb->data - skb_mac_header(skb);
4363 hlen = skb_headlen(skb) + mac_len;
4364 xdp->data = skb->data - mac_len;
4365 xdp->data_meta = xdp->data;
4366 xdp->data_end = xdp->data + hlen;
4367 xdp->data_hard_start = skb->data - skb_headroom(skb);
4368 orig_data_end = xdp->data_end;
4369 orig_data = xdp->data;
4370 eth = (struct ethhdr *)xdp->data;
4371 orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest);
4372 orig_eth_type = eth->h_proto;
4374 rxqueue = netif_get_rxqueue(skb);
4375 xdp->rxq = &rxqueue->xdp_rxq;
4377 act = bpf_prog_run_xdp(xdp_prog, xdp);
4379 off = xdp->data - orig_data;
4381 __skb_pull(skb, off);
4383 __skb_push(skb, -off);
4384 skb->mac_header += off;
4386 /* check if bpf_xdp_adjust_tail was used. it can only "shrink"
4389 off = orig_data_end - xdp->data_end;
4391 skb_set_tail_pointer(skb, xdp->data_end - xdp->data);
4396 /* check if XDP changed eth hdr such SKB needs update */
4397 eth = (struct ethhdr *)xdp->data;
4398 if ((orig_eth_type != eth->h_proto) ||
4399 (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) {
4400 __skb_push(skb, ETH_HLEN);
4401 skb->protocol = eth_type_trans(skb, skb->dev);
4407 __skb_push(skb, mac_len);
4410 metalen = xdp->data - xdp->data_meta;
4412 skb_metadata_set(skb, metalen);
4415 bpf_warn_invalid_xdp_action(act);
4418 trace_xdp_exception(skb->dev, xdp_prog, act);
4429 /* When doing generic XDP we have to bypass the qdisc layer and the
4430 * network taps in order to match in-driver-XDP behavior.
4432 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog)
4434 struct net_device *dev = skb->dev;
4435 struct netdev_queue *txq;
4436 bool free_skb = true;
4439 txq = netdev_core_pick_tx(dev, skb, NULL);
4440 cpu = smp_processor_id();
4441 HARD_TX_LOCK(dev, txq, cpu);
4442 if (!netif_xmit_stopped(txq)) {
4443 rc = netdev_start_xmit(skb, dev, txq, 0);
4444 if (dev_xmit_complete(rc))
4447 HARD_TX_UNLOCK(dev, txq);
4449 trace_xdp_exception(dev, xdp_prog, XDP_TX);
4453 EXPORT_SYMBOL_GPL(generic_xdp_tx);
4455 static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key);
4457 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb)
4460 struct xdp_buff xdp;
4464 act = netif_receive_generic_xdp(skb, &xdp, xdp_prog);
4465 if (act != XDP_PASS) {
4468 err = xdp_do_generic_redirect(skb->dev, skb,
4474 generic_xdp_tx(skb, xdp_prog);
4485 EXPORT_SYMBOL_GPL(do_xdp_generic);
4487 static int netif_rx_internal(struct sk_buff *skb)
4491 net_timestamp_check(netdev_tstamp_prequeue, skb);
4493 trace_netif_rx(skb);
4495 if (static_branch_unlikely(&generic_xdp_needed_key)) {
4500 ret = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
4504 /* Consider XDP consuming the packet a success from
4505 * the netdev point of view we do not want to count
4508 if (ret != XDP_PASS)
4509 return NET_RX_SUCCESS;
4513 if (static_branch_unlikely(&rps_needed)) {
4514 struct rps_dev_flow voidflow, *rflow = &voidflow;
4520 cpu = get_rps_cpu(skb->dev, skb, &rflow);
4522 cpu = smp_processor_id();
4524 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
4533 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
4540 * netif_rx - post buffer to the network code
4541 * @skb: buffer to post
4543 * This function receives a packet from a device driver and queues it for
4544 * the upper (protocol) levels to process. It always succeeds. The buffer
4545 * may be dropped during processing for congestion control or by the
4549 * NET_RX_SUCCESS (no congestion)
4550 * NET_RX_DROP (packet was dropped)
4554 int netif_rx(struct sk_buff *skb)
4558 trace_netif_rx_entry(skb);
4560 ret = netif_rx_internal(skb);
4561 trace_netif_rx_exit(ret);
4565 EXPORT_SYMBOL(netif_rx);
4567 int netif_rx_ni(struct sk_buff *skb)
4571 trace_netif_rx_ni_entry(skb);
4574 err = netif_rx_internal(skb);
4575 if (local_softirq_pending())
4578 trace_netif_rx_ni_exit(err);
4582 EXPORT_SYMBOL(netif_rx_ni);
4584 static __latent_entropy void net_tx_action(struct softirq_action *h)
4586 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
4588 if (sd->completion_queue) {
4589 struct sk_buff *clist;
4591 local_irq_disable();
4592 clist = sd->completion_queue;
4593 sd->completion_queue = NULL;
4597 struct sk_buff *skb = clist;
4599 clist = clist->next;
4601 WARN_ON(refcount_read(&skb->users));
4602 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
4603 trace_consume_skb(skb);
4605 trace_kfree_skb(skb, net_tx_action);
4607 if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
4610 __kfree_skb_defer(skb);
4613 __kfree_skb_flush();
4616 if (sd->output_queue) {
4619 local_irq_disable();
4620 head = sd->output_queue;
4621 sd->output_queue = NULL;
4622 sd->output_queue_tailp = &sd->output_queue;
4626 struct Qdisc *q = head;
4627 spinlock_t *root_lock = NULL;
4629 head = head->next_sched;
4631 if (!(q->flags & TCQ_F_NOLOCK)) {
4632 root_lock = qdisc_lock(q);
4633 spin_lock(root_lock);
4635 /* We need to make sure head->next_sched is read
4636 * before clearing __QDISC_STATE_SCHED
4638 smp_mb__before_atomic();
4639 clear_bit(__QDISC_STATE_SCHED, &q->state);
4642 spin_unlock(root_lock);
4646 xfrm_dev_backlog(sd);
4649 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE)
4650 /* This hook is defined here for ATM LANE */
4651 int (*br_fdb_test_addr_hook)(struct net_device *dev,
4652 unsigned char *addr) __read_mostly;
4653 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
4656 static inline struct sk_buff *
4657 sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
4658 struct net_device *orig_dev)
4660 #ifdef CONFIG_NET_CLS_ACT
4661 struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress);
4662 struct tcf_result cl_res;
4664 /* If there's at least one ingress present somewhere (so
4665 * we get here via enabled static key), remaining devices
4666 * that are not configured with an ingress qdisc will bail
4673 *ret = deliver_skb(skb, *pt_prev, orig_dev);
4677 qdisc_skb_cb(skb)->pkt_len = skb->len;
4678 skb->tc_at_ingress = 1;
4679 mini_qdisc_bstats_cpu_update(miniq, skb);
4681 switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) {
4683 case TC_ACT_RECLASSIFY:
4684 skb->tc_index = TC_H_MIN(cl_res.classid);
4687 mini_qdisc_qstats_cpu_drop(miniq);
4695 case TC_ACT_REDIRECT:
4696 /* skb_mac_header check was done by cls/act_bpf, so
4697 * we can safely push the L2 header back before
4698 * redirecting to another netdev
4700 __skb_push(skb, skb->mac_len);
4701 skb_do_redirect(skb);
4703 case TC_ACT_REINSERT:
4704 /* this does not scrub the packet, and updates stats on error */
4705 skb_tc_reinsert(skb, &cl_res);
4710 #endif /* CONFIG_NET_CLS_ACT */
4715 * netdev_is_rx_handler_busy - check if receive handler is registered
4716 * @dev: device to check
4718 * Check if a receive handler is already registered for a given device.
4719 * Return true if there one.
4721 * The caller must hold the rtnl_mutex.
4723 bool netdev_is_rx_handler_busy(struct net_device *dev)
4726 return dev && rtnl_dereference(dev->rx_handler);
4728 EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);
4731 * netdev_rx_handler_register - register receive handler
4732 * @dev: device to register a handler for
4733 * @rx_handler: receive handler to register
4734 * @rx_handler_data: data pointer that is used by rx handler
4736 * Register a receive handler for a device. This handler will then be
4737 * called from __netif_receive_skb. A negative errno code is returned
4740 * The caller must hold the rtnl_mutex.
4742 * For a general description of rx_handler, see enum rx_handler_result.
4744 int netdev_rx_handler_register(struct net_device *dev,
4745 rx_handler_func_t *rx_handler,
4746 void *rx_handler_data)
4748 if (netdev_is_rx_handler_busy(dev))
4751 if (dev->priv_flags & IFF_NO_RX_HANDLER)
4754 /* Note: rx_handler_data must be set before rx_handler */
4755 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
4756 rcu_assign_pointer(dev->rx_handler, rx_handler);
4760 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
4763 * netdev_rx_handler_unregister - unregister receive handler
4764 * @dev: device to unregister a handler from
4766 * Unregister a receive handler from a device.
4768 * The caller must hold the rtnl_mutex.
4770 void netdev_rx_handler_unregister(struct net_device *dev)
4774 RCU_INIT_POINTER(dev->rx_handler, NULL);
4775 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
4776 * section has a guarantee to see a non NULL rx_handler_data
4780 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
4782 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
4785 * Limit the use of PFMEMALLOC reserves to those protocols that implement
4786 * the special handling of PFMEMALLOC skbs.
4788 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
4790 switch (skb->protocol) {
4791 case htons(ETH_P_ARP):
4792 case htons(ETH_P_IP):
4793 case htons(ETH_P_IPV6):
4794 case htons(ETH_P_8021Q):
4795 case htons(ETH_P_8021AD):
4802 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
4803 int *ret, struct net_device *orig_dev)
4805 #ifdef CONFIG_NETFILTER_INGRESS
4806 if (nf_hook_ingress_active(skb)) {
4810 *ret = deliver_skb(skb, *pt_prev, orig_dev);
4815 ingress_retval = nf_hook_ingress(skb);
4817 return ingress_retval;
4819 #endif /* CONFIG_NETFILTER_INGRESS */
4823 static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc,
4824 struct packet_type **ppt_prev)
4826 struct packet_type *ptype, *pt_prev;
4827 rx_handler_func_t *rx_handler;
4828 struct net_device *orig_dev;
4829 bool deliver_exact = false;
4830 int ret = NET_RX_DROP;
4833 net_timestamp_check(!netdev_tstamp_prequeue, skb);
4835 trace_netif_receive_skb(skb);
4837 orig_dev = skb->dev;
4839 skb_reset_network_header(skb);
4840 if (!skb_transport_header_was_set(skb))
4841 skb_reset_transport_header(skb);
4842 skb_reset_mac_len(skb);
4847 skb->skb_iif = skb->dev->ifindex;
4849 __this_cpu_inc(softnet_data.processed);
4851 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
4852 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
4853 skb = skb_vlan_untag(skb);
4858 if (skb_skip_tc_classify(skb))
4864 list_for_each_entry_rcu(ptype, &ptype_all, list) {
4866 ret = deliver_skb(skb, pt_prev, orig_dev);
4870 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
4872 ret = deliver_skb(skb, pt_prev, orig_dev);
4877 #ifdef CONFIG_NET_INGRESS
4878 if (static_branch_unlikely(&ingress_needed_key)) {
4879 skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev);
4883 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
4889 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
4892 if (skb_vlan_tag_present(skb)) {
4894 ret = deliver_skb(skb, pt_prev, orig_dev);
4897 if (vlan_do_receive(&skb))
4899 else if (unlikely(!skb))
4903 rx_handler = rcu_dereference(skb->dev->rx_handler);
4906 ret = deliver_skb(skb, pt_prev, orig_dev);
4909 switch (rx_handler(&skb)) {
4910 case RX_HANDLER_CONSUMED:
4911 ret = NET_RX_SUCCESS;
4913 case RX_HANDLER_ANOTHER:
4915 case RX_HANDLER_EXACT:
4916 deliver_exact = true;
4917 case RX_HANDLER_PASS:
4924 if (unlikely(skb_vlan_tag_present(skb))) {
4925 if (skb_vlan_tag_get_id(skb))
4926 skb->pkt_type = PACKET_OTHERHOST;
4927 /* Note: we might in the future use prio bits
4928 * and set skb->priority like in vlan_do_receive()
4929 * For the time being, just ignore Priority Code Point
4931 __vlan_hwaccel_clear_tag(skb);
4934 type = skb->protocol;
4936 /* deliver only exact match when indicated */
4937 if (likely(!deliver_exact)) {
4938 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4939 &ptype_base[ntohs(type) &
4943 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4944 &orig_dev->ptype_specific);
4946 if (unlikely(skb->dev != orig_dev)) {
4947 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4948 &skb->dev->ptype_specific);
4952 if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
4954 *ppt_prev = pt_prev;
4958 atomic_long_inc(&skb->dev->rx_dropped);
4960 atomic_long_inc(&skb->dev->rx_nohandler);
4962 /* Jamal, now you will not able to escape explaining
4963 * me how you were going to use this. :-)
4972 static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc)
4974 struct net_device *orig_dev = skb->dev;
4975 struct packet_type *pt_prev = NULL;
4978 ret = __netif_receive_skb_core(skb, pfmemalloc, &pt_prev);
4980 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
4985 * netif_receive_skb_core - special purpose version of netif_receive_skb
4986 * @skb: buffer to process
4988 * More direct receive version of netif_receive_skb(). It should
4989 * only be used by callers that have a need to skip RPS and Generic XDP.
4990 * Caller must also take care of handling if (page_is_)pfmemalloc.
4992 * This function may only be called from softirq context and interrupts
4993 * should be enabled.
4995 * Return values (usually ignored):
4996 * NET_RX_SUCCESS: no congestion
4997 * NET_RX_DROP: packet was dropped
4999 int netif_receive_skb_core(struct sk_buff *skb)
5004 ret = __netif_receive_skb_one_core(skb, false);
5009 EXPORT_SYMBOL(netif_receive_skb_core);
5011 static inline void __netif_receive_skb_list_ptype(struct list_head *head,
5012 struct packet_type *pt_prev,
5013 struct net_device *orig_dev)
5015 struct sk_buff *skb, *next;
5019 if (list_empty(head))
5021 if (pt_prev->list_func != NULL)
5022 pt_prev->list_func(head, pt_prev, orig_dev);
5024 list_for_each_entry_safe(skb, next, head, list)
5025 pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
5028 static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc)
5030 /* Fast-path assumptions:
5031 * - There is no RX handler.
5032 * - Only one packet_type matches.
5033 * If either of these fails, we will end up doing some per-packet
5034 * processing in-line, then handling the 'last ptype' for the whole
5035 * sublist. This can't cause out-of-order delivery to any single ptype,
5036 * because the 'last ptype' must be constant across the sublist, and all
5037 * other ptypes are handled per-packet.
5039 /* Current (common) ptype of sublist */
5040 struct packet_type *pt_curr = NULL;
5041 /* Current (common) orig_dev of sublist */
5042 struct net_device *od_curr = NULL;
5043 struct list_head sublist;
5044 struct sk_buff *skb, *next;
5046 INIT_LIST_HEAD(&sublist);
5047 list_for_each_entry_safe(skb, next, head, list) {
5048 struct net_device *orig_dev = skb->dev;
5049 struct packet_type *pt_prev = NULL;
5051 skb_list_del_init(skb);
5052 __netif_receive_skb_core(skb, pfmemalloc, &pt_prev);
5055 if (pt_curr != pt_prev || od_curr != orig_dev) {
5056 /* dispatch old sublist */
5057 __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);
5058 /* start new sublist */
5059 INIT_LIST_HEAD(&sublist);
5063 list_add_tail(&skb->list, &sublist);
5066 /* dispatch final sublist */
5067 __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);
5070 static int __netif_receive_skb(struct sk_buff *skb)
5074 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
5075 unsigned int noreclaim_flag;
5078 * PFMEMALLOC skbs are special, they should
5079 * - be delivered to SOCK_MEMALLOC sockets only
5080 * - stay away from userspace
5081 * - have bounded memory usage
5083 * Use PF_MEMALLOC as this saves us from propagating the allocation
5084 * context down to all allocation sites.
5086 noreclaim_flag = memalloc_noreclaim_save();
5087 ret = __netif_receive_skb_one_core(skb, true);
5088 memalloc_noreclaim_restore(noreclaim_flag);
5090 ret = __netif_receive_skb_one_core(skb, false);
5095 static void __netif_receive_skb_list(struct list_head *head)
5097 unsigned long noreclaim_flag = 0;
5098 struct sk_buff *skb, *next;
5099 bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */
5101 list_for_each_entry_safe(skb, next, head, list) {
5102 if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) {
5103 struct list_head sublist;
5105 /* Handle the previous sublist */
5106 list_cut_before(&sublist, head, &skb->list);
5107 if (!list_empty(&sublist))
5108 __netif_receive_skb_list_core(&sublist, pfmemalloc);
5109 pfmemalloc = !pfmemalloc;
5110 /* See comments in __netif_receive_skb */
5112 noreclaim_flag = memalloc_noreclaim_save();
5114 memalloc_noreclaim_restore(noreclaim_flag);
5117 /* Handle the remaining sublist */
5118 if (!list_empty(head))
5119 __netif_receive_skb_list_core(head, pfmemalloc);
5120 /* Restore pflags */
5122 memalloc_noreclaim_restore(noreclaim_flag);
5125 static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
5127 struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
5128 struct bpf_prog *new = xdp->prog;
5131 switch (xdp->command) {
5132 case XDP_SETUP_PROG:
5133 rcu_assign_pointer(dev->xdp_prog, new);
5138 static_branch_dec(&generic_xdp_needed_key);
5139 } else if (new && !old) {
5140 static_branch_inc(&generic_xdp_needed_key);
5141 dev_disable_lro(dev);
5142 dev_disable_gro_hw(dev);
5146 case XDP_QUERY_PROG:
5147 xdp->prog_id = old ? old->aux->id : 0;
5158 static int netif_receive_skb_internal(struct sk_buff *skb)
5162 net_timestamp_check(netdev_tstamp_prequeue, skb);
5164 if (skb_defer_rx_timestamp(skb))
5165 return NET_RX_SUCCESS;
5167 if (static_branch_unlikely(&generic_xdp_needed_key)) {
5172 ret = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
5176 if (ret != XDP_PASS)
5182 if (static_branch_unlikely(&rps_needed)) {
5183 struct rps_dev_flow voidflow, *rflow = &voidflow;
5184 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
5187 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5193 ret = __netif_receive_skb(skb);
5198 static void netif_receive_skb_list_internal(struct list_head *head)
5200 struct bpf_prog *xdp_prog = NULL;
5201 struct sk_buff *skb, *next;
5202 struct list_head sublist;
5204 INIT_LIST_HEAD(&sublist);
5205 list_for_each_entry_safe(skb, next, head, list) {
5206 net_timestamp_check(netdev_tstamp_prequeue, skb);
5207 skb_list_del_init(skb);
5208 if (!skb_defer_rx_timestamp(skb))
5209 list_add_tail(&skb->list, &sublist);
5211 list_splice_init(&sublist, head);
5213 if (static_branch_unlikely(&generic_xdp_needed_key)) {
5216 list_for_each_entry_safe(skb, next, head, list) {
5217 xdp_prog = rcu_dereference(skb->dev->xdp_prog);
5218 skb_list_del_init(skb);
5219 if (do_xdp_generic(xdp_prog, skb) == XDP_PASS)
5220 list_add_tail(&skb->list, &sublist);
5224 /* Put passed packets back on main list */
5225 list_splice_init(&sublist, head);
5230 if (static_branch_unlikely(&rps_needed)) {
5231 list_for_each_entry_safe(skb, next, head, list) {
5232 struct rps_dev_flow voidflow, *rflow = &voidflow;
5233 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
5236 /* Will be handled, remove from list */
5237 skb_list_del_init(skb);
5238 enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5243 __netif_receive_skb_list(head);
5248 * netif_receive_skb - process receive buffer from network
5249 * @skb: buffer to process
5251 * netif_receive_skb() is the main receive data processing function.
5252 * It always succeeds. The buffer may be dropped during processing
5253 * for congestion control or by the protocol layers.
5255 * This function may only be called from softirq context and interrupts
5256 * should be enabled.
5258 * Return values (usually ignored):
5259 * NET_RX_SUCCESS: no congestion
5260 * NET_RX_DROP: packet was dropped
5262 int netif_receive_skb(struct sk_buff *skb)
5266 trace_netif_receive_skb_entry(skb);
5268 ret = netif_receive_skb_internal(skb);
5269 trace_netif_receive_skb_exit(ret);
5273 EXPORT_SYMBOL(netif_receive_skb);
5276 * netif_receive_skb_list - process many receive buffers from network
5277 * @head: list of skbs to process.
5279 * Since return value of netif_receive_skb() is normally ignored, and
5280 * wouldn't be meaningful for a list, this function returns void.
5282 * This function may only be called from softirq context and interrupts
5283 * should be enabled.
5285 void netif_receive_skb_list(struct list_head *head)
5287 struct sk_buff *skb;
5289 if (list_empty(head))
5291 if (trace_netif_receive_skb_list_entry_enabled()) {
5292 list_for_each_entry(skb, head, list)
5293 trace_netif_receive_skb_list_entry(skb);
5295 netif_receive_skb_list_internal(head);
5296 trace_netif_receive_skb_list_exit(0);
5298 EXPORT_SYMBOL(netif_receive_skb_list);
5300 DEFINE_PER_CPU(struct work_struct, flush_works);
5302 /* Network device is going away, flush any packets still pending */
5303 static void flush_backlog(struct work_struct *work)
5305 struct sk_buff *skb, *tmp;
5306 struct softnet_data *sd;
5309 sd = this_cpu_ptr(&softnet_data);
5311 local_irq_disable();
5313 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
5314 if (skb->dev->reg_state == NETREG_UNREGISTERING) {
5315 __skb_unlink(skb, &sd->input_pkt_queue);
5317 input_queue_head_incr(sd);
5323 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
5324 if (skb->dev->reg_state == NETREG_UNREGISTERING) {
5325 __skb_unlink(skb, &sd->process_queue);
5327 input_queue_head_incr(sd);
5333 static void flush_all_backlogs(void)
5339 for_each_online_cpu(cpu)
5340 queue_work_on(cpu, system_highpri_wq,
5341 per_cpu_ptr(&flush_works, cpu));
5343 for_each_online_cpu(cpu)
5344 flush_work(per_cpu_ptr(&flush_works, cpu));
5349 INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int));
5350 INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int));
5351 static int napi_gro_complete(struct sk_buff *skb)
5353 struct packet_offload *ptype;
5354 __be16 type = skb->protocol;
5355 struct list_head *head = &offload_base;
5358 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
5360 if (NAPI_GRO_CB(skb)->count == 1) {
5361 skb_shinfo(skb)->gso_size = 0;
5366 list_for_each_entry_rcu(ptype, head, list) {
5367 if (ptype->type != type || !ptype->callbacks.gro_complete)
5370 err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
5371 ipv6_gro_complete, inet_gro_complete,
5378 WARN_ON(&ptype->list == head);
5380 return NET_RX_SUCCESS;
5384 return netif_receive_skb_internal(skb);
5387 static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index,
5390 struct list_head *head = &napi->gro_hash[index].list;
5391 struct sk_buff *skb, *p;
5393 list_for_each_entry_safe_reverse(skb, p, head, list) {
5394 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
5396 skb_list_del_init(skb);
5397 napi_gro_complete(skb);
5398 napi->gro_hash[index].count--;
5401 if (!napi->gro_hash[index].count)
5402 __clear_bit(index, &napi->gro_bitmask);
5405 /* napi->gro_hash[].list contains packets ordered by age.
5406 * youngest packets at the head of it.
5407 * Complete skbs in reverse order to reduce latencies.
5409 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
5411 unsigned long bitmask = napi->gro_bitmask;
5412 unsigned int i, base = ~0U;
5414 while ((i = ffs(bitmask)) != 0) {
5417 __napi_gro_flush_chain(napi, base, flush_old);
5420 EXPORT_SYMBOL(napi_gro_flush);
5422 static struct list_head *gro_list_prepare(struct napi_struct *napi,
5423 struct sk_buff *skb)
5425 unsigned int maclen = skb->dev->hard_header_len;
5426 u32 hash = skb_get_hash_raw(skb);
5427 struct list_head *head;
5430 head = &napi->gro_hash[hash & (GRO_HASH_BUCKETS - 1)].list;
5431 list_for_each_entry(p, head, list) {
5432 unsigned long diffs;
5434 NAPI_GRO_CB(p)->flush = 0;
5436 if (hash != skb_get_hash_raw(p)) {
5437 NAPI_GRO_CB(p)->same_flow = 0;
5441 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
5442 diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb);
5443 if (skb_vlan_tag_present(p))
5444 diffs |= p->vlan_tci ^ skb->vlan_tci;
5445 diffs |= skb_metadata_dst_cmp(p, skb);
5446 diffs |= skb_metadata_differs(p, skb);
5447 if (maclen == ETH_HLEN)
5448 diffs |= compare_ether_header(skb_mac_header(p),
5449 skb_mac_header(skb));
5451 diffs = memcmp(skb_mac_header(p),
5452 skb_mac_header(skb),
5454 NAPI_GRO_CB(p)->same_flow = !diffs;
5460 static void skb_gro_reset_offset(struct sk_buff *skb)
5462 const struct skb_shared_info *pinfo = skb_shinfo(skb);
5463 const skb_frag_t *frag0 = &pinfo->frags[0];
5465 NAPI_GRO_CB(skb)->data_offset = 0;
5466 NAPI_GRO_CB(skb)->frag0 = NULL;
5467 NAPI_GRO_CB(skb)->frag0_len = 0;
5469 if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
5471 !PageHighMem(skb_frag_page(frag0))) {
5472 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
5473 NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,
5474 skb_frag_size(frag0),
5475 skb->end - skb->tail);
5479 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
5481 struct skb_shared_info *pinfo = skb_shinfo(skb);
5483 BUG_ON(skb->end - skb->tail < grow);
5485 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
5487 skb->data_len -= grow;
5490 pinfo->frags[0].page_offset += grow;
5491 skb_frag_size_sub(&pinfo->frags[0], grow);
5493 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
5494 skb_frag_unref(skb, 0);
5495 memmove(pinfo->frags, pinfo->frags + 1,
5496 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
5500 static void gro_flush_oldest(struct list_head *head)
5502 struct sk_buff *oldest;
5504 oldest = list_last_entry(head, struct sk_buff, list);
5506 /* We are called with head length >= MAX_GRO_SKBS, so this is
5509 if (WARN_ON_ONCE(!oldest))
5512 /* Do not adjust napi->gro_hash[].count, caller is adding a new
5515 skb_list_del_init(oldest);
5516 napi_gro_complete(oldest);
5519 INDIRECT_CALLABLE_DECLARE(struct sk_buff *inet_gro_receive(struct list_head *,
5521 INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *,
5523 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
5525 u32 hash = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1);
5526 struct list_head *head = &offload_base;
5527 struct packet_offload *ptype;
5528 __be16 type = skb->protocol;
5529 struct list_head *gro_head;
5530 struct sk_buff *pp = NULL;
5531 enum gro_result ret;
5535 if (netif_elide_gro(skb->dev))
5538 gro_head = gro_list_prepare(napi, skb);
5541 list_for_each_entry_rcu(ptype, head, list) {
5542 if (ptype->type != type || !ptype->callbacks.gro_receive)
5545 skb_set_network_header(skb, skb_gro_offset(skb));
5546 skb_reset_mac_len(skb);
5547 NAPI_GRO_CB(skb)->same_flow = 0;
5548 NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
5549 NAPI_GRO_CB(skb)->free = 0;
5550 NAPI_GRO_CB(skb)->encap_mark = 0;
5551 NAPI_GRO_CB(skb)->recursion_counter = 0;
5552 NAPI_GRO_CB(skb)->is_fou = 0;
5553 NAPI_GRO_CB(skb)->is_atomic = 1;
5554 NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
5556 /* Setup for GRO checksum validation */
5557 switch (skb->ip_summed) {
5558 case CHECKSUM_COMPLETE:
5559 NAPI_GRO_CB(skb)->csum = skb->csum;
5560 NAPI_GRO_CB(skb)->csum_valid = 1;
5561 NAPI_GRO_CB(skb)->csum_cnt = 0;
5563 case CHECKSUM_UNNECESSARY:
5564 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
5565 NAPI_GRO_CB(skb)->csum_valid = 0;
5568 NAPI_GRO_CB(skb)->csum_cnt = 0;
5569 NAPI_GRO_CB(skb)->csum_valid = 0;
5572 pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive,
5573 ipv6_gro_receive, inet_gro_receive,
5579 if (&ptype->list == head)
5582 if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) {
5587 same_flow = NAPI_GRO_CB(skb)->same_flow;
5588 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
5591 skb_list_del_init(pp);
5592 napi_gro_complete(pp);
5593 napi->gro_hash[hash].count--;
5599 if (NAPI_GRO_CB(skb)->flush)
5602 if (unlikely(napi->gro_hash[hash].count >= MAX_GRO_SKBS)) {
5603 gro_flush_oldest(gro_head);
5605 napi->gro_hash[hash].count++;
5607 NAPI_GRO_CB(skb)->count = 1;
5608 NAPI_GRO_CB(skb)->age = jiffies;
5609 NAPI_GRO_CB(skb)->last = skb;
5610 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
5611 list_add(&skb->list, gro_head);
5615 grow = skb_gro_offset(skb) - skb_headlen(skb);
5617 gro_pull_from_frag0(skb, grow);
5619 if (napi->gro_hash[hash].count) {
5620 if (!test_bit(hash, &napi->gro_bitmask))
5621 __set_bit(hash, &napi->gro_bitmask);
5622 } else if (test_bit(hash, &napi->gro_bitmask)) {
5623 __clear_bit(hash, &napi->gro_bitmask);
5633 struct packet_offload *gro_find_receive_by_type(__be16 type)
5635 struct list_head *offload_head = &offload_base;
5636 struct packet_offload *ptype;
5638 list_for_each_entry_rcu(ptype, offload_head, list) {
5639 if (ptype->type != type || !ptype->callbacks.gro_receive)
5645 EXPORT_SYMBOL(gro_find_receive_by_type);
5647 struct packet_offload *gro_find_complete_by_type(__be16 type)
5649 struct list_head *offload_head = &offload_base;
5650 struct packet_offload *ptype;
5652 list_for_each_entry_rcu(ptype, offload_head, list) {
5653 if (ptype->type != type || !ptype->callbacks.gro_complete)
5659 EXPORT_SYMBOL(gro_find_complete_by_type);
5661 static void napi_skb_free_stolen_head(struct sk_buff *skb)
5665 kmem_cache_free(skbuff_head_cache, skb);
5668 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
5672 if (netif_receive_skb_internal(skb))
5680 case GRO_MERGED_FREE:
5681 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
5682 napi_skb_free_stolen_head(skb);
5696 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
5700 skb_mark_napi_id(skb, napi);
5701 trace_napi_gro_receive_entry(skb);
5703 skb_gro_reset_offset(skb);
5705 ret = napi_skb_finish(dev_gro_receive(napi, skb), skb);
5706 trace_napi_gro_receive_exit(ret);
5710 EXPORT_SYMBOL(napi_gro_receive);
5712 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
5714 if (unlikely(skb->pfmemalloc)) {
5718 __skb_pull(skb, skb_headlen(skb));
5719 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
5720 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
5721 __vlan_hwaccel_clear_tag(skb);
5722 skb->dev = napi->dev;
5725 /* eth_type_trans() assumes pkt_type is PACKET_HOST */
5726 skb->pkt_type = PACKET_HOST;
5728 skb->encapsulation = 0;
5729 skb_shinfo(skb)->gso_type = 0;
5730 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
5736 struct sk_buff *napi_get_frags(struct napi_struct *napi)
5738 struct sk_buff *skb = napi->skb;
5741 skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
5744 skb_mark_napi_id(skb, napi);
5749 EXPORT_SYMBOL(napi_get_frags);
5751 static gro_result_t napi_frags_finish(struct napi_struct *napi,
5752 struct sk_buff *skb,
5758 __skb_push(skb, ETH_HLEN);
5759 skb->protocol = eth_type_trans(skb, skb->dev);
5760 if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
5765 napi_reuse_skb(napi, skb);
5768 case GRO_MERGED_FREE:
5769 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
5770 napi_skb_free_stolen_head(skb);
5772 napi_reuse_skb(napi, skb);
5783 /* Upper GRO stack assumes network header starts at gro_offset=0
5784 * Drivers could call both napi_gro_frags() and napi_gro_receive()
5785 * We copy ethernet header into skb->data to have a common layout.
5787 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
5789 struct sk_buff *skb = napi->skb;
5790 const struct ethhdr *eth;
5791 unsigned int hlen = sizeof(*eth);
5795 skb_reset_mac_header(skb);
5796 skb_gro_reset_offset(skb);
5798 eth = skb_gro_header_fast(skb, 0);
5799 if (unlikely(skb_gro_header_hard(skb, hlen))) {
5800 eth = skb_gro_header_slow(skb, hlen, 0);
5801 if (unlikely(!eth)) {
5802 net_warn_ratelimited("%s: dropping impossible skb from %s\n",
5803 __func__, napi->dev->name);
5804 napi_reuse_skb(napi, skb);
5808 gro_pull_from_frag0(skb, hlen);
5809 NAPI_GRO_CB(skb)->frag0 += hlen;
5810 NAPI_GRO_CB(skb)->frag0_len -= hlen;
5812 __skb_pull(skb, hlen);
5815 * This works because the only protocols we care about don't require
5817 * We'll fix it up properly in napi_frags_finish()
5819 skb->protocol = eth->h_proto;
5824 gro_result_t napi_gro_frags(struct napi_struct *napi)
5827 struct sk_buff *skb = napi_frags_skb(napi);
5832 trace_napi_gro_frags_entry(skb);
5834 ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
5835 trace_napi_gro_frags_exit(ret);
5839 EXPORT_SYMBOL(napi_gro_frags);
5841 /* Compute the checksum from gro_offset and return the folded value
5842 * after adding in any pseudo checksum.
5844 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
5849 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
5851 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
5852 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
5853 /* See comments in __skb_checksum_complete(). */
5855 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
5856 !skb->csum_complete_sw)
5857 netdev_rx_csum_fault(skb->dev, skb);
5860 NAPI_GRO_CB(skb)->csum = wsum;
5861 NAPI_GRO_CB(skb)->csum_valid = 1;
5865 EXPORT_SYMBOL(__skb_gro_checksum_complete);
5867 static void net_rps_send_ipi(struct softnet_data *remsd)
5871 struct softnet_data *next = remsd->rps_ipi_next;
5873 if (cpu_online(remsd->cpu))
5874 smp_call_function_single_async(remsd->cpu, &remsd->csd);
5881 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
5882 * Note: called with local irq disabled, but exits with local irq enabled.
5884 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
5887 struct softnet_data *remsd = sd->rps_ipi_list;
5890 sd->rps_ipi_list = NULL;
5894 /* Send pending IPI's to kick RPS processing on remote cpus. */
5895 net_rps_send_ipi(remsd);
5901 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
5904 return sd->rps_ipi_list != NULL;
5910 static int process_backlog(struct napi_struct *napi, int quota)
5912 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
5916 /* Check if we have pending ipi, its better to send them now,
5917 * not waiting net_rx_action() end.
5919 if (sd_has_rps_ipi_waiting(sd)) {
5920 local_irq_disable();
5921 net_rps_action_and_irq_enable(sd);
5924 napi->weight = dev_rx_weight;
5926 struct sk_buff *skb;
5928 while ((skb = __skb_dequeue(&sd->process_queue))) {
5930 __netif_receive_skb(skb);
5932 input_queue_head_incr(sd);
5933 if (++work >= quota)
5938 local_irq_disable();
5940 if (skb_queue_empty(&sd->input_pkt_queue)) {
5942 * Inline a custom version of __napi_complete().
5943 * only current cpu owns and manipulates this napi,
5944 * and NAPI_STATE_SCHED is the only possible flag set
5946 * We can use a plain write instead of clear_bit(),
5947 * and we dont need an smp_mb() memory barrier.
5952 skb_queue_splice_tail_init(&sd->input_pkt_queue,
5953 &sd->process_queue);
5963 * __napi_schedule - schedule for receive
5964 * @n: entry to schedule
5966 * The entry's receive function will be scheduled to run.
5967 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
5969 void __napi_schedule(struct napi_struct *n)
5971 unsigned long flags;
5973 local_irq_save(flags);
5974 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
5975 local_irq_restore(flags);
5977 EXPORT_SYMBOL(__napi_schedule);
5980 * napi_schedule_prep - check if napi can be scheduled
5983 * Test if NAPI routine is already running, and if not mark
5984 * it as running. This is used as a condition variable
5985 * insure only one NAPI poll instance runs. We also make
5986 * sure there is no pending NAPI disable.
5988 bool napi_schedule_prep(struct napi_struct *n)
5990 unsigned long val, new;
5993 val = READ_ONCE(n->state);
5994 if (unlikely(val & NAPIF_STATE_DISABLE))
5996 new = val | NAPIF_STATE_SCHED;
5998 /* Sets STATE_MISSED bit if STATE_SCHED was already set
5999 * This was suggested by Alexander Duyck, as compiler
6000 * emits better code than :
6001 * if (val & NAPIF_STATE_SCHED)
6002 * new |= NAPIF_STATE_MISSED;
6004 new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED *
6006 } while (cmpxchg(&n->state, val, new) != val);
6008 return !(val & NAPIF_STATE_SCHED);
6010 EXPORT_SYMBOL(napi_schedule_prep);
6013 * __napi_schedule_irqoff - schedule for receive
6014 * @n: entry to schedule
6016 * Variant of __napi_schedule() assuming hard irqs are masked
6018 void __napi_schedule_irqoff(struct napi_struct *n)
6020 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
6022 EXPORT_SYMBOL(__napi_schedule_irqoff);
6024 bool napi_complete_done(struct napi_struct *n, int work_done)
6026 unsigned long flags, val, new;
6029 * 1) Don't let napi dequeue from the cpu poll list
6030 * just in case its running on a different cpu.
6031 * 2) If we are busy polling, do nothing here, we have
6032 * the guarantee we will be called later.
6034 if (unlikely(n->state & (NAPIF_STATE_NPSVC |
6035 NAPIF_STATE_IN_BUSY_POLL)))
6038 if (n->gro_bitmask) {
6039 unsigned long timeout = 0;
6042 timeout = n->dev->gro_flush_timeout;
6044 /* When the NAPI instance uses a timeout and keeps postponing
6045 * it, we need to bound somehow the time packets are kept in
6048 napi_gro_flush(n, !!timeout);
6050 hrtimer_start(&n->timer, ns_to_ktime(timeout),
6051 HRTIMER_MODE_REL_PINNED);
6053 if (unlikely(!list_empty(&n->poll_list))) {
6054 /* If n->poll_list is not empty, we need to mask irqs */
6055 local_irq_save(flags);
6056 list_del_init(&n->poll_list);
6057 local_irq_restore(flags);
6061 val = READ_ONCE(n->state);
6063 WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED));
6065 new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED);
6067 /* If STATE_MISSED was set, leave STATE_SCHED set,
6068 * because we will call napi->poll() one more time.
6069 * This C code was suggested by Alexander Duyck to help gcc.
6071 new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED *
6073 } while (cmpxchg(&n->state, val, new) != val);
6075 if (unlikely(val & NAPIF_STATE_MISSED)) {
6082 EXPORT_SYMBOL(napi_complete_done);
6084 /* must be called under rcu_read_lock(), as we dont take a reference */
6085 static struct napi_struct *napi_by_id(unsigned int napi_id)
6087 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
6088 struct napi_struct *napi;
6090 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
6091 if (napi->napi_id == napi_id)
6097 #if defined(CONFIG_NET_RX_BUSY_POLL)
6099 #define BUSY_POLL_BUDGET 8
6101 static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock)
6105 /* Busy polling means there is a high chance device driver hard irq
6106 * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was
6107 * set in napi_schedule_prep().
6108 * Since we are about to call napi->poll() once more, we can safely
6109 * clear NAPI_STATE_MISSED.
6111 * Note: x86 could use a single "lock and ..." instruction
6112 * to perform these two clear_bit()
6114 clear_bit(NAPI_STATE_MISSED, &napi->state);
6115 clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state);
6119 /* All we really want here is to re-enable device interrupts.
6120 * Ideally, a new ndo_busy_poll_stop() could avoid another round.
6122 rc = napi->poll(napi, BUSY_POLL_BUDGET);
6123 trace_napi_poll(napi, rc, BUSY_POLL_BUDGET);
6124 netpoll_poll_unlock(have_poll_lock);
6125 if (rc == BUSY_POLL_BUDGET)
6126 __napi_schedule(napi);
6130 void napi_busy_loop(unsigned int napi_id,
6131 bool (*loop_end)(void *, unsigned long),
6134 unsigned long start_time = loop_end ? busy_loop_current_time() : 0;
6135 int (*napi_poll)(struct napi_struct *napi, int budget);
6136 void *have_poll_lock = NULL;
6137 struct napi_struct *napi;
6144 napi = napi_by_id(napi_id);
6154 unsigned long val = READ_ONCE(napi->state);
6156 /* If multiple threads are competing for this napi,
6157 * we avoid dirtying napi->state as much as we can.
6159 if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED |
6160 NAPIF_STATE_IN_BUSY_POLL))
6162 if (cmpxchg(&napi->state, val,
6163 val | NAPIF_STATE_IN_BUSY_POLL |
6164 NAPIF_STATE_SCHED) != val)
6166 have_poll_lock = netpoll_poll_lock(napi);
6167 napi_poll = napi->poll;
6169 work = napi_poll(napi, BUSY_POLL_BUDGET);
6170 trace_napi_poll(napi, work, BUSY_POLL_BUDGET);
6173 __NET_ADD_STATS(dev_net(napi->dev),
6174 LINUX_MIB_BUSYPOLLRXPACKETS, work);
6177 if (!loop_end || loop_end(loop_end_arg, start_time))
6180 if (unlikely(need_resched())) {
6182 busy_poll_stop(napi, have_poll_lock);
6186 if (loop_end(loop_end_arg, start_time))
6193 busy_poll_stop(napi, have_poll_lock);
6198 EXPORT_SYMBOL(napi_busy_loop);
6200 #endif /* CONFIG_NET_RX_BUSY_POLL */
6202 static void napi_hash_add(struct napi_struct *napi)
6204 if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) ||
6205 test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
6208 spin_lock(&napi_hash_lock);
6210 /* 0..NR_CPUS range is reserved for sender_cpu use */
6212 if (unlikely(++napi_gen_id < MIN_NAPI_ID))
6213 napi_gen_id = MIN_NAPI_ID;
6214 } while (napi_by_id(napi_gen_id));
6215 napi->napi_id = napi_gen_id;
6217 hlist_add_head_rcu(&napi->napi_hash_node,
6218 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
6220 spin_unlock(&napi_hash_lock);
6223 /* Warning : caller is responsible to make sure rcu grace period
6224 * is respected before freeing memory containing @napi
6226 bool napi_hash_del(struct napi_struct *napi)
6228 bool rcu_sync_needed = false;
6230 spin_lock(&napi_hash_lock);
6232 if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) {
6233 rcu_sync_needed = true;
6234 hlist_del_rcu(&napi->napi_hash_node);
6236 spin_unlock(&napi_hash_lock);
6237 return rcu_sync_needed;
6239 EXPORT_SYMBOL_GPL(napi_hash_del);
6241 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
6243 struct napi_struct *napi;
6245 napi = container_of(timer, struct napi_struct, timer);
6247 /* Note : we use a relaxed variant of napi_schedule_prep() not setting
6248 * NAPI_STATE_MISSED, since we do not react to a device IRQ.
6250 if (napi->gro_bitmask && !napi_disable_pending(napi) &&
6251 !test_and_set_bit(NAPI_STATE_SCHED, &napi->state))
6252 __napi_schedule_irqoff(napi);
6254 return HRTIMER_NORESTART;
6257 static void init_gro_hash(struct napi_struct *napi)
6261 for (i = 0; i < GRO_HASH_BUCKETS; i++) {
6262 INIT_LIST_HEAD(&napi->gro_hash[i].list);
6263 napi->gro_hash[i].count = 0;
6265 napi->gro_bitmask = 0;
6268 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
6269 int (*poll)(struct napi_struct *, int), int weight)
6271 INIT_LIST_HEAD(&napi->poll_list);
6272 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
6273 napi->timer.function = napi_watchdog;
6274 init_gro_hash(napi);
6277 if (weight > NAPI_POLL_WEIGHT)
6278 netdev_err_once(dev, "%s() called with weight %d\n", __func__,
6280 napi->weight = weight;
6281 list_add(&napi->dev_list, &dev->napi_list);
6283 #ifdef CONFIG_NETPOLL
6284 napi->poll_owner = -1;
6286 set_bit(NAPI_STATE_SCHED, &napi->state);
6287 napi_hash_add(napi);
6289 EXPORT_SYMBOL(netif_napi_add);
6291 void napi_disable(struct napi_struct *n)
6294 set_bit(NAPI_STATE_DISABLE, &n->state);
6296 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
6298 while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state))
6301 hrtimer_cancel(&n->timer);
6303 clear_bit(NAPI_STATE_DISABLE, &n->state);
6305 EXPORT_SYMBOL(napi_disable);
6307 static void flush_gro_hash(struct napi_struct *napi)
6311 for (i = 0; i < GRO_HASH_BUCKETS; i++) {
6312 struct sk_buff *skb, *n;
6314 list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list)
6316 napi->gro_hash[i].count = 0;
6320 /* Must be called in process context */
6321 void netif_napi_del(struct napi_struct *napi)
6324 if (napi_hash_del(napi))
6326 list_del_init(&napi->dev_list);
6327 napi_free_frags(napi);
6329 flush_gro_hash(napi);
6330 napi->gro_bitmask = 0;
6332 EXPORT_SYMBOL(netif_napi_del);
6334 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
6339 list_del_init(&n->poll_list);
6341 have = netpoll_poll_lock(n);
6345 /* This NAPI_STATE_SCHED test is for avoiding a race
6346 * with netpoll's poll_napi(). Only the entity which
6347 * obtains the lock and sees NAPI_STATE_SCHED set will
6348 * actually make the ->poll() call. Therefore we avoid
6349 * accidentally calling ->poll() when NAPI is not scheduled.
6352 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
6353 work = n->poll(n, weight);
6354 trace_napi_poll(n, work, weight);
6357 WARN_ON_ONCE(work > weight);
6359 if (likely(work < weight))
6362 /* Drivers must not modify the NAPI state if they
6363 * consume the entire weight. In such cases this code
6364 * still "owns" the NAPI instance and therefore can
6365 * move the instance around on the list at-will.
6367 if (unlikely(napi_disable_pending(n))) {
6372 if (n->gro_bitmask) {
6373 /* flush too old packets
6374 * If HZ < 1000, flush all packets.
6376 napi_gro_flush(n, HZ >= 1000);
6379 /* Some drivers may have called napi_schedule
6380 * prior to exhausting their budget.
6382 if (unlikely(!list_empty(&n->poll_list))) {
6383 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
6384 n->dev ? n->dev->name : "backlog");
6388 list_add_tail(&n->poll_list, repoll);
6391 netpoll_poll_unlock(have);
6396 static __latent_entropy void net_rx_action(struct softirq_action *h)
6398 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
6399 unsigned long time_limit = jiffies +
6400 usecs_to_jiffies(netdev_budget_usecs);
6401 int budget = netdev_budget;
6405 local_irq_disable();
6406 list_splice_init(&sd->poll_list, &list);
6410 struct napi_struct *n;
6412 if (list_empty(&list)) {
6413 if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
6418 n = list_first_entry(&list, struct napi_struct, poll_list);
6419 budget -= napi_poll(n, &repoll);
6421 /* If softirq window is exhausted then punt.
6422 * Allow this to run for 2 jiffies since which will allow
6423 * an average latency of 1.5/HZ.
6425 if (unlikely(budget <= 0 ||
6426 time_after_eq(jiffies, time_limit))) {
6432 local_irq_disable();
6434 list_splice_tail_init(&sd->poll_list, &list);
6435 list_splice_tail(&repoll, &list);
6436 list_splice(&list, &sd->poll_list);
6437 if (!list_empty(&sd->poll_list))
6438 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
6440 net_rps_action_and_irq_enable(sd);
6442 __kfree_skb_flush();
6445 struct netdev_adjacent {
6446 struct net_device *dev;
6448 /* upper master flag, there can only be one master device per list */
6451 /* counter for the number of times this device was added to us */
6454 /* private field for the users */
6457 struct list_head list;
6458 struct rcu_head rcu;
6461 static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
6462 struct list_head *adj_list)
6464 struct netdev_adjacent *adj;
6466 list_for_each_entry(adj, adj_list, list) {
6467 if (adj->dev == adj_dev)
6473 static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data)
6475 struct net_device *dev = data;
6477 return upper_dev == dev;
6481 * netdev_has_upper_dev - Check if device is linked to an upper device
6483 * @upper_dev: upper device to check
6485 * Find out if a device is linked to specified upper device and return true
6486 * in case it is. Note that this checks only immediate upper device,
6487 * not through a complete stack of devices. The caller must hold the RTNL lock.
6489 bool netdev_has_upper_dev(struct net_device *dev,
6490 struct net_device *upper_dev)
6494 return netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev,
6497 EXPORT_SYMBOL(netdev_has_upper_dev);
6500 * netdev_has_upper_dev_all - Check if device is linked to an upper device
6502 * @upper_dev: upper device to check
6504 * Find out if a device is linked to specified upper device and return true
6505 * in case it is. Note that this checks the entire upper device chain.
6506 * The caller must hold rcu lock.
6509 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
6510 struct net_device *upper_dev)
6512 return !!netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev,
6515 EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);
6518 * netdev_has_any_upper_dev - Check if device is linked to some device
6521 * Find out if a device is linked to an upper device and return true in case
6522 * it is. The caller must hold the RTNL lock.
6524 bool netdev_has_any_upper_dev(struct net_device *dev)
6528 return !list_empty(&dev->adj_list.upper);
6530 EXPORT_SYMBOL(netdev_has_any_upper_dev);
6533 * netdev_master_upper_dev_get - Get master upper device
6536 * Find a master upper device and return pointer to it or NULL in case
6537 * it's not there. The caller must hold the RTNL lock.
6539 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
6541 struct netdev_adjacent *upper;
6545 if (list_empty(&dev->adj_list.upper))
6548 upper = list_first_entry(&dev->adj_list.upper,
6549 struct netdev_adjacent, list);
6550 if (likely(upper->master))
6554 EXPORT_SYMBOL(netdev_master_upper_dev_get);
6557 * netdev_has_any_lower_dev - Check if device is linked to some device
6560 * Find out if a device is linked to a lower device and return true in case
6561 * it is. The caller must hold the RTNL lock.
6563 static bool netdev_has_any_lower_dev(struct net_device *dev)
6567 return !list_empty(&dev->adj_list.lower);
6570 void *netdev_adjacent_get_private(struct list_head *adj_list)
6572 struct netdev_adjacent *adj;
6574 adj = list_entry(adj_list, struct netdev_adjacent, list);
6576 return adj->private;
6578 EXPORT_SYMBOL(netdev_adjacent_get_private);
6581 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
6583 * @iter: list_head ** of the current position
6585 * Gets the next device from the dev's upper list, starting from iter
6586 * position. The caller must hold RCU read lock.
6588 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
6589 struct list_head **iter)
6591 struct netdev_adjacent *upper;
6593 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
6595 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
6597 if (&upper->list == &dev->adj_list.upper)
6600 *iter = &upper->list;
6604 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
6606 static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev,
6607 struct list_head **iter)
6609 struct netdev_adjacent *upper;
6611 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
6613 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
6615 if (&upper->list == &dev->adj_list.upper)
6618 *iter = &upper->list;
6623 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
6624 int (*fn)(struct net_device *dev,
6628 struct net_device *udev;
6629 struct list_head *iter;
6632 for (iter = &dev->adj_list.upper,
6633 udev = netdev_next_upper_dev_rcu(dev, &iter);
6635 udev = netdev_next_upper_dev_rcu(dev, &iter)) {
6636 /* first is the upper device itself */
6637 ret = fn(udev, data);
6641 /* then look at all of its upper devices */
6642 ret = netdev_walk_all_upper_dev_rcu(udev, fn, data);
6649 EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu);
6652 * netdev_lower_get_next_private - Get the next ->private from the
6653 * lower neighbour list
6655 * @iter: list_head ** of the current position
6657 * Gets the next netdev_adjacent->private from the dev's lower neighbour
6658 * list, starting from iter position. The caller must hold either hold the
6659 * RTNL lock or its own locking that guarantees that the neighbour lower
6660 * list will remain unchanged.
6662 void *netdev_lower_get_next_private(struct net_device *dev,
6663 struct list_head **iter)
6665 struct netdev_adjacent *lower;
6667 lower = list_entry(*iter, struct netdev_adjacent, list);
6669 if (&lower->list == &dev->adj_list.lower)
6672 *iter = lower->list.next;
6674 return lower->private;
6676 EXPORT_SYMBOL(netdev_lower_get_next_private);
6679 * netdev_lower_get_next_private_rcu - Get the next ->private from the
6680 * lower neighbour list, RCU
6683 * @iter: list_head ** of the current position
6685 * Gets the next netdev_adjacent->private from the dev's lower neighbour
6686 * list, starting from iter position. The caller must hold RCU read lock.
6688 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
6689 struct list_head **iter)
6691 struct netdev_adjacent *lower;
6693 WARN_ON_ONCE(!rcu_read_lock_held());
6695 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
6697 if (&lower->list == &dev->adj_list.lower)
6700 *iter = &lower->list;
6702 return lower->private;
6704 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
6707 * netdev_lower_get_next - Get the next device from the lower neighbour
6710 * @iter: list_head ** of the current position
6712 * Gets the next netdev_adjacent from the dev's lower neighbour
6713 * list, starting from iter position. The caller must hold RTNL lock or
6714 * its own locking that guarantees that the neighbour lower
6715 * list will remain unchanged.
6717 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
6719 struct netdev_adjacent *lower;
6721 lower = list_entry(*iter, struct netdev_adjacent, list);
6723 if (&lower->list == &dev->adj_list.lower)
6726 *iter = lower->list.next;
6730 EXPORT_SYMBOL(netdev_lower_get_next);
6732 static struct net_device *netdev_next_lower_dev(struct net_device *dev,
6733 struct list_head **iter)
6735 struct netdev_adjacent *lower;
6737 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
6739 if (&lower->list == &dev->adj_list.lower)
6742 *iter = &lower->list;
6747 int netdev_walk_all_lower_dev(struct net_device *dev,
6748 int (*fn)(struct net_device *dev,
6752 struct net_device *ldev;
6753 struct list_head *iter;
6756 for (iter = &dev->adj_list.lower,
6757 ldev = netdev_next_lower_dev(dev, &iter);
6759 ldev = netdev_next_lower_dev(dev, &iter)) {
6760 /* first is the lower device itself */
6761 ret = fn(ldev, data);
6765 /* then look at all of its lower devices */
6766 ret = netdev_walk_all_lower_dev(ldev, fn, data);
6773 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev);
6775 static struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev,
6776 struct list_head **iter)
6778 struct netdev_adjacent *lower;
6780 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
6781 if (&lower->list == &dev->adj_list.lower)
6784 *iter = &lower->list;
6789 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
6790 int (*fn)(struct net_device *dev,
6794 struct net_device *ldev;
6795 struct list_head *iter;
6798 for (iter = &dev->adj_list.lower,
6799 ldev = netdev_next_lower_dev_rcu(dev, &iter);
6801 ldev = netdev_next_lower_dev_rcu(dev, &iter)) {
6802 /* first is the lower device itself */
6803 ret = fn(ldev, data);
6807 /* then look at all of its lower devices */
6808 ret = netdev_walk_all_lower_dev_rcu(ldev, fn, data);
6815 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu);
6818 * netdev_lower_get_first_private_rcu - Get the first ->private from the
6819 * lower neighbour list, RCU
6823 * Gets the first netdev_adjacent->private from the dev's lower neighbour
6824 * list. The caller must hold RCU read lock.
6826 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
6828 struct netdev_adjacent *lower;
6830 lower = list_first_or_null_rcu(&dev->adj_list.lower,
6831 struct netdev_adjacent, list);
6833 return lower->private;
6836 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
6839 * netdev_master_upper_dev_get_rcu - Get master upper device
6842 * Find a master upper device and return pointer to it or NULL in case
6843 * it's not there. The caller must hold the RCU read lock.
6845 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
6847 struct netdev_adjacent *upper;
6849 upper = list_first_or_null_rcu(&dev->adj_list.upper,
6850 struct netdev_adjacent, list);
6851 if (upper && likely(upper->master))
6855 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
6857 static int netdev_adjacent_sysfs_add(struct net_device *dev,
6858 struct net_device *adj_dev,
6859 struct list_head *dev_list)
6861 char linkname[IFNAMSIZ+7];
6863 sprintf(linkname, dev_list == &dev->adj_list.upper ?
6864 "upper_%s" : "lower_%s", adj_dev->name);
6865 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
6868 static void netdev_adjacent_sysfs_del(struct net_device *dev,
6870 struct list_head *dev_list)
6872 char linkname[IFNAMSIZ+7];
6874 sprintf(linkname, dev_list == &dev->adj_list.upper ?
6875 "upper_%s" : "lower_%s", name);
6876 sysfs_remove_link(&(dev->dev.kobj), linkname);
6879 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
6880 struct net_device *adj_dev,
6881 struct list_head *dev_list)
6883 return (dev_list == &dev->adj_list.upper ||
6884 dev_list == &dev->adj_list.lower) &&
6885 net_eq(dev_net(dev), dev_net(adj_dev));
6888 static int __netdev_adjacent_dev_insert(struct net_device *dev,
6889 struct net_device *adj_dev,
6890 struct list_head *dev_list,
6891 void *private, bool master)
6893 struct netdev_adjacent *adj;
6896 adj = __netdev_find_adj(adj_dev, dev_list);
6900 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n",
6901 dev->name, adj_dev->name, adj->ref_nr);
6906 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
6911 adj->master = master;
6913 adj->private = private;
6916 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n",
6917 dev->name, adj_dev->name, adj->ref_nr, adj_dev->name);
6919 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
6920 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
6925 /* Ensure that master link is always the first item in list. */
6927 ret = sysfs_create_link(&(dev->dev.kobj),
6928 &(adj_dev->dev.kobj), "master");
6930 goto remove_symlinks;
6932 list_add_rcu(&adj->list, dev_list);
6934 list_add_tail_rcu(&adj->list, dev_list);
6940 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
6941 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
6949 static void __netdev_adjacent_dev_remove(struct net_device *dev,
6950 struct net_device *adj_dev,
6952 struct list_head *dev_list)
6954 struct netdev_adjacent *adj;
6956 pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n",
6957 dev->name, adj_dev->name, ref_nr);
6959 adj = __netdev_find_adj(adj_dev, dev_list);
6962 pr_err("Adjacency does not exist for device %s from %s\n",
6963 dev->name, adj_dev->name);
6968 if (adj->ref_nr > ref_nr) {
6969 pr_debug("adjacency: %s to %s ref_nr - %d = %d\n",
6970 dev->name, adj_dev->name, ref_nr,
6971 adj->ref_nr - ref_nr);
6972 adj->ref_nr -= ref_nr;
6977 sysfs_remove_link(&(dev->dev.kobj), "master");
6979 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
6980 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
6982 list_del_rcu(&adj->list);
6983 pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n",
6984 adj_dev->name, dev->name, adj_dev->name);
6986 kfree_rcu(adj, rcu);
6989 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
6990 struct net_device *upper_dev,
6991 struct list_head *up_list,
6992 struct list_head *down_list,
6993 void *private, bool master)
6997 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list,
7002 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list,
7005 __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list);
7012 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
7013 struct net_device *upper_dev,
7015 struct list_head *up_list,
7016 struct list_head *down_list)
7018 __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list);
7019 __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list);
7022 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
7023 struct net_device *upper_dev,
7024 void *private, bool master)
7026 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
7027 &dev->adj_list.upper,
7028 &upper_dev->adj_list.lower,
7032 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
7033 struct net_device *upper_dev)
7035 __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1,
7036 &dev->adj_list.upper,
7037 &upper_dev->adj_list.lower);
7040 static int __netdev_upper_dev_link(struct net_device *dev,
7041 struct net_device *upper_dev, bool master,
7042 void *upper_priv, void *upper_info,
7043 struct netlink_ext_ack *extack)
7045 struct netdev_notifier_changeupper_info changeupper_info = {
7050 .upper_dev = upper_dev,
7053 .upper_info = upper_info,
7055 struct net_device *master_dev;
7060 if (dev == upper_dev)
7063 /* To prevent loops, check if dev is not upper device to upper_dev. */
7064 if (netdev_has_upper_dev(upper_dev, dev))
7068 if (netdev_has_upper_dev(dev, upper_dev))
7071 master_dev = netdev_master_upper_dev_get(dev);
7073 return master_dev == upper_dev ? -EEXIST : -EBUSY;
7076 ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER,
7077 &changeupper_info.info);
7078 ret = notifier_to_errno(ret);
7082 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv,
7087 ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER,
7088 &changeupper_info.info);
7089 ret = notifier_to_errno(ret);
7096 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
7102 * netdev_upper_dev_link - Add a link to the upper device
7104 * @upper_dev: new upper device
7105 * @extack: netlink extended ack
7107 * Adds a link to device which is upper to this one. The caller must hold
7108 * the RTNL lock. On a failure a negative errno code is returned.
7109 * On success the reference counts are adjusted and the function
7112 int netdev_upper_dev_link(struct net_device *dev,
7113 struct net_device *upper_dev,
7114 struct netlink_ext_ack *extack)
7116 return __netdev_upper_dev_link(dev, upper_dev, false,
7117 NULL, NULL, extack);
7119 EXPORT_SYMBOL(netdev_upper_dev_link);
7122 * netdev_master_upper_dev_link - Add a master link to the upper device
7124 * @upper_dev: new upper device
7125 * @upper_priv: upper device private
7126 * @upper_info: upper info to be passed down via notifier
7127 * @extack: netlink extended ack
7129 * Adds a link to device which is upper to this one. In this case, only
7130 * one master upper device can be linked, although other non-master devices
7131 * might be linked as well. The caller must hold the RTNL lock.
7132 * On a failure a negative errno code is returned. On success the reference
7133 * counts are adjusted and the function returns zero.
7135 int netdev_master_upper_dev_link(struct net_device *dev,
7136 struct net_device *upper_dev,
7137 void *upper_priv, void *upper_info,
7138 struct netlink_ext_ack *extack)
7140 return __netdev_upper_dev_link(dev, upper_dev, true,
7141 upper_priv, upper_info, extack);
7143 EXPORT_SYMBOL(netdev_master_upper_dev_link);
7146 * netdev_upper_dev_unlink - Removes a link to upper device
7148 * @upper_dev: new upper device
7150 * Removes a link to device which is upper to this one. The caller must hold
7153 void netdev_upper_dev_unlink(struct net_device *dev,
7154 struct net_device *upper_dev)
7156 struct netdev_notifier_changeupper_info changeupper_info = {
7160 .upper_dev = upper_dev,
7166 changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
7168 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER,
7169 &changeupper_info.info);
7171 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
7173 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER,
7174 &changeupper_info.info);
7176 EXPORT_SYMBOL(netdev_upper_dev_unlink);
7179 * netdev_bonding_info_change - Dispatch event about slave change
7181 * @bonding_info: info to dispatch
7183 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
7184 * The caller must hold the RTNL lock.
7186 void netdev_bonding_info_change(struct net_device *dev,
7187 struct netdev_bonding_info *bonding_info)
7189 struct netdev_notifier_bonding_info info = {
7193 memcpy(&info.bonding_info, bonding_info,
7194 sizeof(struct netdev_bonding_info));
7195 call_netdevice_notifiers_info(NETDEV_BONDING_INFO,
7198 EXPORT_SYMBOL(netdev_bonding_info_change);
7200 static void netdev_adjacent_add_links(struct net_device *dev)
7202 struct netdev_adjacent *iter;
7204 struct net *net = dev_net(dev);
7206 list_for_each_entry(iter, &dev->adj_list.upper, list) {
7207 if (!net_eq(net, dev_net(iter->dev)))
7209 netdev_adjacent_sysfs_add(iter->dev, dev,
7210 &iter->dev->adj_list.lower);
7211 netdev_adjacent_sysfs_add(dev, iter->dev,
7212 &dev->adj_list.upper);
7215 list_for_each_entry(iter, &dev->adj_list.lower, list) {
7216 if (!net_eq(net, dev_net(iter->dev)))
7218 netdev_adjacent_sysfs_add(iter->dev, dev,
7219 &iter->dev->adj_list.upper);
7220 netdev_adjacent_sysfs_add(dev, iter->dev,
7221 &dev->adj_list.lower);
7225 static void netdev_adjacent_del_links(struct net_device *dev)
7227 struct netdev_adjacent *iter;
7229 struct net *net = dev_net(dev);
7231 list_for_each_entry(iter, &dev->adj_list.upper, list) {
7232 if (!net_eq(net, dev_net(iter->dev)))
7234 netdev_adjacent_sysfs_del(iter->dev, dev->name,
7235 &iter->dev->adj_list.lower);
7236 netdev_adjacent_sysfs_del(dev, iter->dev->name,
7237 &dev->adj_list.upper);
7240 list_for_each_entry(iter, &dev->adj_list.lower, list) {
7241 if (!net_eq(net, dev_net(iter->dev)))
7243 netdev_adjacent_sysfs_del(iter->dev, dev->name,
7244 &iter->dev->adj_list.upper);
7245 netdev_adjacent_sysfs_del(dev, iter->dev->name,
7246 &dev->adj_list.lower);
7250 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
7252 struct netdev_adjacent *iter;
7254 struct net *net = dev_net(dev);
7256 list_for_each_entry(iter, &dev->adj_list.upper, list) {
7257 if (!net_eq(net, dev_net(iter->dev)))
7259 netdev_adjacent_sysfs_del(iter->dev, oldname,
7260 &iter->dev->adj_list.lower);
7261 netdev_adjacent_sysfs_add(iter->dev, dev,
7262 &iter->dev->adj_list.lower);
7265 list_for_each_entry(iter, &dev->adj_list.lower, list) {
7266 if (!net_eq(net, dev_net(iter->dev)))
7268 netdev_adjacent_sysfs_del(iter->dev, oldname,
7269 &iter->dev->adj_list.upper);
7270 netdev_adjacent_sysfs_add(iter->dev, dev,
7271 &iter->dev->adj_list.upper);
7275 void *netdev_lower_dev_get_private(struct net_device *dev,
7276 struct net_device *lower_dev)
7278 struct netdev_adjacent *lower;
7282 lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
7286 return lower->private;
7288 EXPORT_SYMBOL(netdev_lower_dev_get_private);
7291 int dev_get_nest_level(struct net_device *dev)
7293 struct net_device *lower = NULL;
7294 struct list_head *iter;
7300 netdev_for_each_lower_dev(dev, lower, iter) {
7301 nest = dev_get_nest_level(lower);
7302 if (max_nest < nest)
7306 return max_nest + 1;
7308 EXPORT_SYMBOL(dev_get_nest_level);
7311 * netdev_lower_change - Dispatch event about lower device state change
7312 * @lower_dev: device
7313 * @lower_state_info: state to dispatch
7315 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
7316 * The caller must hold the RTNL lock.
7318 void netdev_lower_state_changed(struct net_device *lower_dev,
7319 void *lower_state_info)
7321 struct netdev_notifier_changelowerstate_info changelowerstate_info = {
7322 .info.dev = lower_dev,
7326 changelowerstate_info.lower_state_info = lower_state_info;
7327 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE,
7328 &changelowerstate_info.info);
7330 EXPORT_SYMBOL(netdev_lower_state_changed);
7332 static void dev_change_rx_flags(struct net_device *dev, int flags)
7334 const struct net_device_ops *ops = dev->netdev_ops;
7336 if (ops->ndo_change_rx_flags)
7337 ops->ndo_change_rx_flags(dev, flags);
7340 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
7342 unsigned int old_flags = dev->flags;
7348 dev->flags |= IFF_PROMISC;
7349 dev->promiscuity += inc;
7350 if (dev->promiscuity == 0) {
7353 * If inc causes overflow, untouch promisc and return error.
7356 dev->flags &= ~IFF_PROMISC;
7358 dev->promiscuity -= inc;
7359 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
7364 if (dev->flags != old_flags) {
7365 pr_info("device %s %s promiscuous mode\n",
7367 dev->flags & IFF_PROMISC ? "entered" : "left");
7368 if (audit_enabled) {
7369 current_uid_gid(&uid, &gid);
7370 audit_log(audit_context(), GFP_ATOMIC,
7371 AUDIT_ANOM_PROMISCUOUS,
7372 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
7373 dev->name, (dev->flags & IFF_PROMISC),
7374 (old_flags & IFF_PROMISC),
7375 from_kuid(&init_user_ns, audit_get_loginuid(current)),
7376 from_kuid(&init_user_ns, uid),
7377 from_kgid(&init_user_ns, gid),
7378 audit_get_sessionid(current));
7381 dev_change_rx_flags(dev, IFF_PROMISC);
7384 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
7389 * dev_set_promiscuity - update promiscuity count on a device
7393 * Add or remove promiscuity from a device. While the count in the device
7394 * remains above zero the interface remains promiscuous. Once it hits zero
7395 * the device reverts back to normal filtering operation. A negative inc
7396 * value is used to drop promiscuity on the device.
7397 * Return 0 if successful or a negative errno code on error.
7399 int dev_set_promiscuity(struct net_device *dev, int inc)
7401 unsigned int old_flags = dev->flags;
7404 err = __dev_set_promiscuity(dev, inc, true);
7407 if (dev->flags != old_flags)
7408 dev_set_rx_mode(dev);
7411 EXPORT_SYMBOL(dev_set_promiscuity);
7413 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
7415 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
7419 dev->flags |= IFF_ALLMULTI;
7420 dev->allmulti += inc;
7421 if (dev->allmulti == 0) {
7424 * If inc causes overflow, untouch allmulti and return error.
7427 dev->flags &= ~IFF_ALLMULTI;
7429 dev->allmulti -= inc;
7430 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
7435 if (dev->flags ^ old_flags) {
7436 dev_change_rx_flags(dev, IFF_ALLMULTI);
7437 dev_set_rx_mode(dev);
7439 __dev_notify_flags(dev, old_flags,
7440 dev->gflags ^ old_gflags);
7446 * dev_set_allmulti - update allmulti count on a device
7450 * Add or remove reception of all multicast frames to a device. While the
7451 * count in the device remains above zero the interface remains listening
7452 * to all interfaces. Once it hits zero the device reverts back to normal
7453 * filtering operation. A negative @inc value is used to drop the counter
7454 * when releasing a resource needing all multicasts.
7455 * Return 0 if successful or a negative errno code on error.
7458 int dev_set_allmulti(struct net_device *dev, int inc)
7460 return __dev_set_allmulti(dev, inc, true);
7462 EXPORT_SYMBOL(dev_set_allmulti);
7465 * Upload unicast and multicast address lists to device and
7466 * configure RX filtering. When the device doesn't support unicast
7467 * filtering it is put in promiscuous mode while unicast addresses
7470 void __dev_set_rx_mode(struct net_device *dev)
7472 const struct net_device_ops *ops = dev->netdev_ops;
7474 /* dev_open will call this function so the list will stay sane. */
7475 if (!(dev->flags&IFF_UP))
7478 if (!netif_device_present(dev))
7481 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
7482 /* Unicast addresses changes may only happen under the rtnl,
7483 * therefore calling __dev_set_promiscuity here is safe.
7485 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
7486 __dev_set_promiscuity(dev, 1, false);
7487 dev->uc_promisc = true;
7488 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
7489 __dev_set_promiscuity(dev, -1, false);
7490 dev->uc_promisc = false;
7494 if (ops->ndo_set_rx_mode)
7495 ops->ndo_set_rx_mode(dev);
7498 void dev_set_rx_mode(struct net_device *dev)
7500 netif_addr_lock_bh(dev);
7501 __dev_set_rx_mode(dev);
7502 netif_addr_unlock_bh(dev);
7506 * dev_get_flags - get flags reported to userspace
7509 * Get the combination of flag bits exported through APIs to userspace.
7511 unsigned int dev_get_flags(const struct net_device *dev)
7515 flags = (dev->flags & ~(IFF_PROMISC |
7520 (dev->gflags & (IFF_PROMISC |
7523 if (netif_running(dev)) {
7524 if (netif_oper_up(dev))
7525 flags |= IFF_RUNNING;
7526 if (netif_carrier_ok(dev))
7527 flags |= IFF_LOWER_UP;
7528 if (netif_dormant(dev))
7529 flags |= IFF_DORMANT;
7534 EXPORT_SYMBOL(dev_get_flags);
7536 int __dev_change_flags(struct net_device *dev, unsigned int flags,
7537 struct netlink_ext_ack *extack)
7539 unsigned int old_flags = dev->flags;
7545 * Set the flags on our device.
7548 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
7549 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
7551 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
7555 * Load in the correct multicast list now the flags have changed.
7558 if ((old_flags ^ flags) & IFF_MULTICAST)
7559 dev_change_rx_flags(dev, IFF_MULTICAST);
7561 dev_set_rx_mode(dev);
7564 * Have we downed the interface. We handle IFF_UP ourselves
7565 * according to user attempts to set it, rather than blindly
7570 if ((old_flags ^ flags) & IFF_UP) {
7571 if (old_flags & IFF_UP)
7574 ret = __dev_open(dev, extack);
7577 if ((flags ^ dev->gflags) & IFF_PROMISC) {
7578 int inc = (flags & IFF_PROMISC) ? 1 : -1;
7579 unsigned int old_flags = dev->flags;
7581 dev->gflags ^= IFF_PROMISC;
7583 if (__dev_set_promiscuity(dev, inc, false) >= 0)
7584 if (dev->flags != old_flags)
7585 dev_set_rx_mode(dev);
7588 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
7589 * is important. Some (broken) drivers set IFF_PROMISC, when
7590 * IFF_ALLMULTI is requested not asking us and not reporting.
7592 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
7593 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
7595 dev->gflags ^= IFF_ALLMULTI;
7596 __dev_set_allmulti(dev, inc, false);
7602 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
7603 unsigned int gchanges)
7605 unsigned int changes = dev->flags ^ old_flags;
7608 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
7610 if (changes & IFF_UP) {
7611 if (dev->flags & IFF_UP)
7612 call_netdevice_notifiers(NETDEV_UP, dev);
7614 call_netdevice_notifiers(NETDEV_DOWN, dev);
7617 if (dev->flags & IFF_UP &&
7618 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
7619 struct netdev_notifier_change_info change_info = {
7623 .flags_changed = changes,
7626 call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info);
7631 * dev_change_flags - change device settings
7633 * @flags: device state flags
7634 * @extack: netlink extended ack
7636 * Change settings on device based state flags. The flags are
7637 * in the userspace exported format.
7639 int dev_change_flags(struct net_device *dev, unsigned int flags,
7640 struct netlink_ext_ack *extack)
7643 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
7645 ret = __dev_change_flags(dev, flags, extack);
7649 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
7650 __dev_notify_flags(dev, old_flags, changes);
7653 EXPORT_SYMBOL(dev_change_flags);
7655 int __dev_set_mtu(struct net_device *dev, int new_mtu)
7657 const struct net_device_ops *ops = dev->netdev_ops;
7659 if (ops->ndo_change_mtu)
7660 return ops->ndo_change_mtu(dev, new_mtu);
7665 EXPORT_SYMBOL(__dev_set_mtu);
7668 * dev_set_mtu_ext - Change maximum transfer unit
7670 * @new_mtu: new transfer unit
7671 * @extack: netlink extended ack
7673 * Change the maximum transfer size of the network device.
7675 int dev_set_mtu_ext(struct net_device *dev, int new_mtu,
7676 struct netlink_ext_ack *extack)
7680 if (new_mtu == dev->mtu)
7683 /* MTU must be positive, and in range */
7684 if (new_mtu < 0 || new_mtu < dev->min_mtu) {
7685 NL_SET_ERR_MSG(extack, "mtu less than device minimum");
7689 if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) {
7690 NL_SET_ERR_MSG(extack, "mtu greater than device maximum");
7694 if (!netif_device_present(dev))
7697 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
7698 err = notifier_to_errno(err);
7702 orig_mtu = dev->mtu;
7703 err = __dev_set_mtu(dev, new_mtu);
7706 err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
7708 err = notifier_to_errno(err);
7710 /* setting mtu back and notifying everyone again,
7711 * so that they have a chance to revert changes.
7713 __dev_set_mtu(dev, orig_mtu);
7714 call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
7721 int dev_set_mtu(struct net_device *dev, int new_mtu)
7723 struct netlink_ext_ack extack;
7726 memset(&extack, 0, sizeof(extack));
7727 err = dev_set_mtu_ext(dev, new_mtu, &extack);
7728 if (err && extack._msg)
7729 net_err_ratelimited("%s: %s\n", dev->name, extack._msg);
7732 EXPORT_SYMBOL(dev_set_mtu);
7735 * dev_change_tx_queue_len - Change TX queue length of a netdevice
7737 * @new_len: new tx queue length
7739 int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len)
7741 unsigned int orig_len = dev->tx_queue_len;
7744 if (new_len != (unsigned int)new_len)
7747 if (new_len != orig_len) {
7748 dev->tx_queue_len = new_len;
7749 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
7750 res = notifier_to_errno(res);
7753 res = dev_qdisc_change_tx_queue_len(dev);
7761 netdev_err(dev, "refused to change device tx_queue_len\n");
7762 dev->tx_queue_len = orig_len;
7767 * dev_set_group - Change group this device belongs to
7769 * @new_group: group this device should belong to
7771 void dev_set_group(struct net_device *dev, int new_group)
7773 dev->group = new_group;
7775 EXPORT_SYMBOL(dev_set_group);
7778 * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR.
7780 * @addr: new address
7781 * @extack: netlink extended ack
7783 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
7784 struct netlink_ext_ack *extack)
7786 struct netdev_notifier_pre_changeaddr_info info = {
7788 .info.extack = extack,
7793 rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info);
7794 return notifier_to_errno(rc);
7796 EXPORT_SYMBOL(dev_pre_changeaddr_notify);
7799 * dev_set_mac_address - Change Media Access Control Address
7802 * @extack: netlink extended ack
7804 * Change the hardware (MAC) address of the device
7806 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
7807 struct netlink_ext_ack *extack)
7809 const struct net_device_ops *ops = dev->netdev_ops;
7812 if (!ops->ndo_set_mac_address)
7814 if (sa->sa_family != dev->type)
7816 if (!netif_device_present(dev))
7818 err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack);
7821 err = ops->ndo_set_mac_address(dev, sa);
7824 dev->addr_assign_type = NET_ADDR_SET;
7825 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
7826 add_device_randomness(dev->dev_addr, dev->addr_len);
7829 EXPORT_SYMBOL(dev_set_mac_address);
7832 * dev_change_carrier - Change device carrier
7834 * @new_carrier: new value
7836 * Change device carrier
7838 int dev_change_carrier(struct net_device *dev, bool new_carrier)
7840 const struct net_device_ops *ops = dev->netdev_ops;
7842 if (!ops->ndo_change_carrier)
7844 if (!netif_device_present(dev))
7846 return ops->ndo_change_carrier(dev, new_carrier);
7848 EXPORT_SYMBOL(dev_change_carrier);
7851 * dev_get_phys_port_id - Get device physical port ID
7855 * Get device physical port ID
7857 int dev_get_phys_port_id(struct net_device *dev,
7858 struct netdev_phys_item_id *ppid)
7860 const struct net_device_ops *ops = dev->netdev_ops;
7862 if (!ops->ndo_get_phys_port_id)
7864 return ops->ndo_get_phys_port_id(dev, ppid);
7866 EXPORT_SYMBOL(dev_get_phys_port_id);
7869 * dev_get_phys_port_name - Get device physical port name
7872 * @len: limit of bytes to copy to name
7874 * Get device physical port name
7876 int dev_get_phys_port_name(struct net_device *dev,
7877 char *name, size_t len)
7879 const struct net_device_ops *ops = dev->netdev_ops;
7881 if (!ops->ndo_get_phys_port_name)
7883 return ops->ndo_get_phys_port_name(dev, name, len);
7885 EXPORT_SYMBOL(dev_get_phys_port_name);
7888 * dev_get_port_parent_id - Get the device's port parent identifier
7889 * @dev: network device
7890 * @ppid: pointer to a storage for the port's parent identifier
7891 * @recurse: allow/disallow recursion to lower devices
7893 * Get the devices's port parent identifier
7895 int dev_get_port_parent_id(struct net_device *dev,
7896 struct netdev_phys_item_id *ppid,
7899 const struct net_device_ops *ops = dev->netdev_ops;
7900 struct netdev_phys_item_id first = { };
7901 struct net_device *lower_dev;
7902 struct list_head *iter;
7903 int err = -EOPNOTSUPP;
7905 if (ops->ndo_get_port_parent_id)
7906 return ops->ndo_get_port_parent_id(dev, ppid);
7911 netdev_for_each_lower_dev(dev, lower_dev, iter) {
7912 err = dev_get_port_parent_id(lower_dev, ppid, recurse);
7917 else if (memcmp(&first, ppid, sizeof(*ppid)))
7923 EXPORT_SYMBOL(dev_get_port_parent_id);
7926 * netdev_port_same_parent_id - Indicate if two network devices have
7927 * the same port parent identifier
7928 * @a: first network device
7929 * @b: second network device
7931 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b)
7933 struct netdev_phys_item_id a_id = { };
7934 struct netdev_phys_item_id b_id = { };
7936 if (dev_get_port_parent_id(a, &a_id, true) ||
7937 dev_get_port_parent_id(b, &b_id, true))
7940 return netdev_phys_item_id_same(&a_id, &b_id);
7942 EXPORT_SYMBOL(netdev_port_same_parent_id);
7945 * dev_change_proto_down - update protocol port state information
7947 * @proto_down: new value
7949 * This info can be used by switch drivers to set the phys state of the
7952 int dev_change_proto_down(struct net_device *dev, bool proto_down)
7954 const struct net_device_ops *ops = dev->netdev_ops;
7956 if (!ops->ndo_change_proto_down)
7958 if (!netif_device_present(dev))
7960 return ops->ndo_change_proto_down(dev, proto_down);
7962 EXPORT_SYMBOL(dev_change_proto_down);
7965 * dev_change_proto_down_generic - generic implementation for
7966 * ndo_change_proto_down that sets carrier according to
7970 * @proto_down: new value
7972 int dev_change_proto_down_generic(struct net_device *dev, bool proto_down)
7975 netif_carrier_off(dev);
7977 netif_carrier_on(dev);
7978 dev->proto_down = proto_down;
7981 EXPORT_SYMBOL(dev_change_proto_down_generic);
7983 u32 __dev_xdp_query(struct net_device *dev, bpf_op_t bpf_op,
7984 enum bpf_netdev_command cmd)
7986 struct netdev_bpf xdp;
7991 memset(&xdp, 0, sizeof(xdp));
7994 /* Query must always succeed. */
7995 WARN_ON(bpf_op(dev, &xdp) < 0 && cmd == XDP_QUERY_PROG);
8000 static int dev_xdp_install(struct net_device *dev, bpf_op_t bpf_op,
8001 struct netlink_ext_ack *extack, u32 flags,
8002 struct bpf_prog *prog)
8004 struct netdev_bpf xdp;
8006 memset(&xdp, 0, sizeof(xdp));
8007 if (flags & XDP_FLAGS_HW_MODE)
8008 xdp.command = XDP_SETUP_PROG_HW;
8010 xdp.command = XDP_SETUP_PROG;
8011 xdp.extack = extack;
8015 return bpf_op(dev, &xdp);
8018 static void dev_xdp_uninstall(struct net_device *dev)
8020 struct netdev_bpf xdp;
8023 /* Remove generic XDP */
8024 WARN_ON(dev_xdp_install(dev, generic_xdp_install, NULL, 0, NULL));
8026 /* Remove from the driver */
8027 ndo_bpf = dev->netdev_ops->ndo_bpf;
8031 memset(&xdp, 0, sizeof(xdp));
8032 xdp.command = XDP_QUERY_PROG;
8033 WARN_ON(ndo_bpf(dev, &xdp));
8035 WARN_ON(dev_xdp_install(dev, ndo_bpf, NULL, xdp.prog_flags,
8038 /* Remove HW offload */
8039 memset(&xdp, 0, sizeof(xdp));
8040 xdp.command = XDP_QUERY_PROG_HW;
8041 if (!ndo_bpf(dev, &xdp) && xdp.prog_id)
8042 WARN_ON(dev_xdp_install(dev, ndo_bpf, NULL, xdp.prog_flags,
8047 * dev_change_xdp_fd - set or clear a bpf program for a device rx path
8049 * @extack: netlink extended ack
8050 * @fd: new program fd or negative value to clear
8051 * @flags: xdp-related flags
8053 * Set or clear a bpf program for a device
8055 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
8058 const struct net_device_ops *ops = dev->netdev_ops;
8059 enum bpf_netdev_command query;
8060 struct bpf_prog *prog = NULL;
8061 bpf_op_t bpf_op, bpf_chk;
8067 offload = flags & XDP_FLAGS_HW_MODE;
8068 query = offload ? XDP_QUERY_PROG_HW : XDP_QUERY_PROG;
8070 bpf_op = bpf_chk = ops->ndo_bpf;
8071 if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE))) {
8072 NL_SET_ERR_MSG(extack, "underlying driver does not support XDP in native mode");
8075 if (!bpf_op || (flags & XDP_FLAGS_SKB_MODE))
8076 bpf_op = generic_xdp_install;
8077 if (bpf_op == bpf_chk)
8078 bpf_chk = generic_xdp_install;
8081 if (!offload && __dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG)) {
8082 NL_SET_ERR_MSG(extack, "native and generic XDP can't be active at the same time");
8085 if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) &&
8086 __dev_xdp_query(dev, bpf_op, query)) {
8087 NL_SET_ERR_MSG(extack, "XDP program already attached");
8091 prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,
8092 bpf_op == ops->ndo_bpf);
8094 return PTR_ERR(prog);
8096 if (!offload && bpf_prog_is_dev_bound(prog->aux)) {
8097 NL_SET_ERR_MSG(extack, "using device-bound program without HW_MODE flag is not supported");
8103 err = dev_xdp_install(dev, bpf_op, extack, flags, prog);
8104 if (err < 0 && prog)
8111 * dev_new_index - allocate an ifindex
8112 * @net: the applicable net namespace
8114 * Returns a suitable unique value for a new device interface
8115 * number. The caller must hold the rtnl semaphore or the
8116 * dev_base_lock to be sure it remains unique.
8118 static int dev_new_index(struct net *net)
8120 int ifindex = net->ifindex;
8125 if (!__dev_get_by_index(net, ifindex))
8126 return net->ifindex = ifindex;
8130 /* Delayed registration/unregisteration */
8131 static LIST_HEAD(net_todo_list);
8132 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
8134 static void net_set_todo(struct net_device *dev)
8136 list_add_tail(&dev->todo_list, &net_todo_list);
8137 dev_net(dev)->dev_unreg_count++;
8140 static void rollback_registered_many(struct list_head *head)
8142 struct net_device *dev, *tmp;
8143 LIST_HEAD(close_head);
8145 BUG_ON(dev_boot_phase);
8148 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
8149 /* Some devices call without registering
8150 * for initialization unwind. Remove those
8151 * devices and proceed with the remaining.
8153 if (dev->reg_state == NETREG_UNINITIALIZED) {
8154 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
8158 list_del(&dev->unreg_list);
8161 dev->dismantle = true;
8162 BUG_ON(dev->reg_state != NETREG_REGISTERED);
8165 /* If device is running, close it first. */
8166 list_for_each_entry(dev, head, unreg_list)
8167 list_add_tail(&dev->close_list, &close_head);
8168 dev_close_many(&close_head, true);
8170 list_for_each_entry(dev, head, unreg_list) {
8171 /* And unlink it from device chain. */
8172 unlist_netdevice(dev);
8174 dev->reg_state = NETREG_UNREGISTERING;
8176 flush_all_backlogs();
8180 list_for_each_entry(dev, head, unreg_list) {
8181 struct sk_buff *skb = NULL;
8183 /* Shutdown queueing discipline. */
8186 dev_xdp_uninstall(dev);
8188 /* Notify protocols, that we are about to destroy
8189 * this device. They should clean all the things.
8191 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
8193 if (!dev->rtnl_link_ops ||
8194 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
8195 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0,
8196 GFP_KERNEL, NULL, 0);
8199 * Flush the unicast and multicast chains
8204 if (dev->netdev_ops->ndo_uninit)
8205 dev->netdev_ops->ndo_uninit(dev);
8208 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);
8210 /* Notifier chain MUST detach us all upper devices. */
8211 WARN_ON(netdev_has_any_upper_dev(dev));
8212 WARN_ON(netdev_has_any_lower_dev(dev));
8214 /* Remove entries from kobject tree */
8215 netdev_unregister_kobject(dev);
8217 /* Remove XPS queueing entries */
8218 netif_reset_xps_queues_gt(dev, 0);
8224 list_for_each_entry(dev, head, unreg_list)
8228 static void rollback_registered(struct net_device *dev)
8232 list_add(&dev->unreg_list, &single);
8233 rollback_registered_many(&single);
8237 static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
8238 struct net_device *upper, netdev_features_t features)
8240 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
8241 netdev_features_t feature;
8244 for_each_netdev_feature(upper_disables, feature_bit) {
8245 feature = __NETIF_F_BIT(feature_bit);
8246 if (!(upper->wanted_features & feature)
8247 && (features & feature)) {
8248 netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
8249 &feature, upper->name);
8250 features &= ~feature;
8257 static void netdev_sync_lower_features(struct net_device *upper,
8258 struct net_device *lower, netdev_features_t features)
8260 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
8261 netdev_features_t feature;
8264 for_each_netdev_feature(upper_disables, feature_bit) {
8265 feature = __NETIF_F_BIT(feature_bit);
8266 if (!(features & feature) && (lower->features & feature)) {
8267 netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
8268 &feature, lower->name);
8269 lower->wanted_features &= ~feature;
8270 netdev_update_features(lower);
8272 if (unlikely(lower->features & feature))
8273 netdev_WARN(upper, "failed to disable %pNF on %s!\n",
8274 &feature, lower->name);
8279 static netdev_features_t netdev_fix_features(struct net_device *dev,
8280 netdev_features_t features)
8282 /* Fix illegal checksum combinations */
8283 if ((features & NETIF_F_HW_CSUM) &&
8284 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
8285 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
8286 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
8289 /* TSO requires that SG is present as well. */
8290 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
8291 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
8292 features &= ~NETIF_F_ALL_TSO;
8295 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
8296 !(features & NETIF_F_IP_CSUM)) {
8297 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
8298 features &= ~NETIF_F_TSO;
8299 features &= ~NETIF_F_TSO_ECN;
8302 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
8303 !(features & NETIF_F_IPV6_CSUM)) {
8304 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
8305 features &= ~NETIF_F_TSO6;
8308 /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
8309 if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO))
8310 features &= ~NETIF_F_TSO_MANGLEID;
8312 /* TSO ECN requires that TSO is present as well. */
8313 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
8314 features &= ~NETIF_F_TSO_ECN;
8316 /* Software GSO depends on SG. */
8317 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
8318 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
8319 features &= ~NETIF_F_GSO;
8322 /* GSO partial features require GSO partial be set */
8323 if ((features & dev->gso_partial_features) &&
8324 !(features & NETIF_F_GSO_PARTIAL)) {
8326 "Dropping partially supported GSO features since no GSO partial.\n");
8327 features &= ~dev->gso_partial_features;
8330 if (!(features & NETIF_F_RXCSUM)) {
8331 /* NETIF_F_GRO_HW implies doing RXCSUM since every packet
8332 * successfully merged by hardware must also have the
8333 * checksum verified by hardware. If the user does not
8334 * want to enable RXCSUM, logically, we should disable GRO_HW.
8336 if (features & NETIF_F_GRO_HW) {
8337 netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n");
8338 features &= ~NETIF_F_GRO_HW;
8342 /* LRO/HW-GRO features cannot be combined with RX-FCS */
8343 if (features & NETIF_F_RXFCS) {
8344 if (features & NETIF_F_LRO) {
8345 netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n");
8346 features &= ~NETIF_F_LRO;
8349 if (features & NETIF_F_GRO_HW) {
8350 netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n");
8351 features &= ~NETIF_F_GRO_HW;
8358 int __netdev_update_features(struct net_device *dev)
8360 struct net_device *upper, *lower;
8361 netdev_features_t features;
8362 struct list_head *iter;
8367 features = netdev_get_wanted_features(dev);
8369 if (dev->netdev_ops->ndo_fix_features)
8370 features = dev->netdev_ops->ndo_fix_features(dev, features);
8372 /* driver might be less strict about feature dependencies */
8373 features = netdev_fix_features(dev, features);
8375 /* some features can't be enabled if they're off an an upper device */
8376 netdev_for_each_upper_dev_rcu(dev, upper, iter)
8377 features = netdev_sync_upper_features(dev, upper, features);
8379 if (dev->features == features)
8382 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
8383 &dev->features, &features);
8385 if (dev->netdev_ops->ndo_set_features)
8386 err = dev->netdev_ops->ndo_set_features(dev, features);
8390 if (unlikely(err < 0)) {
8392 "set_features() failed (%d); wanted %pNF, left %pNF\n",
8393 err, &features, &dev->features);
8394 /* return non-0 since some features might have changed and
8395 * it's better to fire a spurious notification than miss it
8401 /* some features must be disabled on lower devices when disabled
8402 * on an upper device (think: bonding master or bridge)
8404 netdev_for_each_lower_dev(dev, lower, iter)
8405 netdev_sync_lower_features(dev, lower, features);
8408 netdev_features_t diff = features ^ dev->features;
8410 if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) {
8411 /* udp_tunnel_{get,drop}_rx_info both need
8412 * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the
8413 * device, or they won't do anything.
8414 * Thus we need to update dev->features
8415 * *before* calling udp_tunnel_get_rx_info,
8416 * but *after* calling udp_tunnel_drop_rx_info.
8418 if (features & NETIF_F_RX_UDP_TUNNEL_PORT) {
8419 dev->features = features;
8420 udp_tunnel_get_rx_info(dev);
8422 udp_tunnel_drop_rx_info(dev);
8426 if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) {
8427 if (features & NETIF_F_HW_VLAN_CTAG_FILTER) {
8428 dev->features = features;
8429 err |= vlan_get_rx_ctag_filter_info(dev);
8431 vlan_drop_rx_ctag_filter_info(dev);
8435 if (diff & NETIF_F_HW_VLAN_STAG_FILTER) {
8436 if (features & NETIF_F_HW_VLAN_STAG_FILTER) {
8437 dev->features = features;
8438 err |= vlan_get_rx_stag_filter_info(dev);
8440 vlan_drop_rx_stag_filter_info(dev);
8444 dev->features = features;
8447 return err < 0 ? 0 : 1;
8451 * netdev_update_features - recalculate device features
8452 * @dev: the device to check
8454 * Recalculate dev->features set and send notifications if it
8455 * has changed. Should be called after driver or hardware dependent
8456 * conditions might have changed that influence the features.
8458 void netdev_update_features(struct net_device *dev)
8460 if (__netdev_update_features(dev))
8461 netdev_features_change(dev);
8463 EXPORT_SYMBOL(netdev_update_features);
8466 * netdev_change_features - recalculate device features
8467 * @dev: the device to check
8469 * Recalculate dev->features set and send notifications even
8470 * if they have not changed. Should be called instead of
8471 * netdev_update_features() if also dev->vlan_features might
8472 * have changed to allow the changes to be propagated to stacked
8475 void netdev_change_features(struct net_device *dev)
8477 __netdev_update_features(dev);
8478 netdev_features_change(dev);
8480 EXPORT_SYMBOL(netdev_change_features);
8483 * netif_stacked_transfer_operstate - transfer operstate
8484 * @rootdev: the root or lower level device to transfer state from
8485 * @dev: the device to transfer operstate to
8487 * Transfer operational state from root to device. This is normally
8488 * called when a stacking relationship exists between the root
8489 * device and the device(a leaf device).
8491 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
8492 struct net_device *dev)
8494 if (rootdev->operstate == IF_OPER_DORMANT)
8495 netif_dormant_on(dev);
8497 netif_dormant_off(dev);
8499 if (netif_carrier_ok(rootdev))
8500 netif_carrier_on(dev);
8502 netif_carrier_off(dev);
8504 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
8506 static int netif_alloc_rx_queues(struct net_device *dev)
8508 unsigned int i, count = dev->num_rx_queues;
8509 struct netdev_rx_queue *rx;
8510 size_t sz = count * sizeof(*rx);
8515 rx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
8521 for (i = 0; i < count; i++) {
8524 /* XDP RX-queue setup */
8525 err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i);
8532 /* Rollback successful reg's and free other resources */
8534 xdp_rxq_info_unreg(&rx[i].xdp_rxq);
8540 static void netif_free_rx_queues(struct net_device *dev)
8542 unsigned int i, count = dev->num_rx_queues;
8544 /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */
8548 for (i = 0; i < count; i++)
8549 xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq);
8554 static void netdev_init_one_queue(struct net_device *dev,
8555 struct netdev_queue *queue, void *_unused)
8557 /* Initialize queue lock */
8558 spin_lock_init(&queue->_xmit_lock);
8559 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
8560 queue->xmit_lock_owner = -1;
8561 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
8564 dql_init(&queue->dql, HZ);
8568 static void netif_free_tx_queues(struct net_device *dev)
8573 static int netif_alloc_netdev_queues(struct net_device *dev)
8575 unsigned int count = dev->num_tx_queues;
8576 struct netdev_queue *tx;
8577 size_t sz = count * sizeof(*tx);
8579 if (count < 1 || count > 0xffff)
8582 tx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
8588 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
8589 spin_lock_init(&dev->tx_global_lock);
8594 void netif_tx_stop_all_queues(struct net_device *dev)
8598 for (i = 0; i < dev->num_tx_queues; i++) {
8599 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
8601 netif_tx_stop_queue(txq);
8604 EXPORT_SYMBOL(netif_tx_stop_all_queues);
8607 * register_netdevice - register a network device
8608 * @dev: device to register
8610 * Take a completed network device structure and add it to the kernel
8611 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
8612 * chain. 0 is returned on success. A negative errno code is returned
8613 * on a failure to set up the device, or if the name is a duplicate.
8615 * Callers must hold the rtnl semaphore. You may want
8616 * register_netdev() instead of this.
8619 * The locking appears insufficient to guarantee two parallel registers
8620 * will not get the same name.
8623 int register_netdevice(struct net_device *dev)
8626 struct net *net = dev_net(dev);
8628 BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE <
8629 NETDEV_FEATURE_COUNT);
8630 BUG_ON(dev_boot_phase);
8635 /* When net_device's are persistent, this will be fatal. */
8636 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
8639 spin_lock_init(&dev->addr_list_lock);
8640 netdev_set_addr_lockdep_class(dev);
8642 ret = dev_get_valid_name(net, dev, dev->name);
8646 /* Init, if this function is available */
8647 if (dev->netdev_ops->ndo_init) {
8648 ret = dev->netdev_ops->ndo_init(dev);
8656 if (((dev->hw_features | dev->features) &
8657 NETIF_F_HW_VLAN_CTAG_FILTER) &&
8658 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
8659 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
8660 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
8667 dev->ifindex = dev_new_index(net);
8668 else if (__dev_get_by_index(net, dev->ifindex))
8671 /* Transfer changeable features to wanted_features and enable
8672 * software offloads (GSO and GRO).
8674 dev->hw_features |= NETIF_F_SOFT_FEATURES;
8675 dev->features |= NETIF_F_SOFT_FEATURES;
8677 if (dev->netdev_ops->ndo_udp_tunnel_add) {
8678 dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT;
8679 dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT;
8682 dev->wanted_features = dev->features & dev->hw_features;
8684 if (!(dev->flags & IFF_LOOPBACK))
8685 dev->hw_features |= NETIF_F_NOCACHE_COPY;
8687 /* If IPv4 TCP segmentation offload is supported we should also
8688 * allow the device to enable segmenting the frame with the option
8689 * of ignoring a static IP ID value. This doesn't enable the
8690 * feature itself but allows the user to enable it later.
8692 if (dev->hw_features & NETIF_F_TSO)
8693 dev->hw_features |= NETIF_F_TSO_MANGLEID;
8694 if (dev->vlan_features & NETIF_F_TSO)
8695 dev->vlan_features |= NETIF_F_TSO_MANGLEID;
8696 if (dev->mpls_features & NETIF_F_TSO)
8697 dev->mpls_features |= NETIF_F_TSO_MANGLEID;
8698 if (dev->hw_enc_features & NETIF_F_TSO)
8699 dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
8701 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
8703 dev->vlan_features |= NETIF_F_HIGHDMA;
8705 /* Make NETIF_F_SG inheritable to tunnel devices.
8707 dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
8709 /* Make NETIF_F_SG inheritable to MPLS.
8711 dev->mpls_features |= NETIF_F_SG;
8713 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
8714 ret = notifier_to_errno(ret);
8718 ret = netdev_register_kobject(dev);
8721 dev->reg_state = NETREG_REGISTERED;
8723 __netdev_update_features(dev);
8726 * Default initial state at registry is that the
8727 * device is present.
8730 set_bit(__LINK_STATE_PRESENT, &dev->state);
8732 linkwatch_init_dev(dev);
8734 dev_init_scheduler(dev);
8736 list_netdevice(dev);
8737 add_device_randomness(dev->dev_addr, dev->addr_len);
8739 /* If the device has permanent device address, driver should
8740 * set dev_addr and also addr_assign_type should be set to
8741 * NET_ADDR_PERM (default value).
8743 if (dev->addr_assign_type == NET_ADDR_PERM)
8744 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
8746 /* Notify protocols, that a new device appeared. */
8747 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
8748 ret = notifier_to_errno(ret);
8750 rollback_registered(dev);
8751 dev->reg_state = NETREG_UNREGISTERED;
8754 * Prevent userspace races by waiting until the network
8755 * device is fully setup before sending notifications.
8757 if (!dev->rtnl_link_ops ||
8758 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
8759 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
8765 if (dev->netdev_ops->ndo_uninit)
8766 dev->netdev_ops->ndo_uninit(dev);
8767 if (dev->priv_destructor)
8768 dev->priv_destructor(dev);
8771 EXPORT_SYMBOL(register_netdevice);
8774 * init_dummy_netdev - init a dummy network device for NAPI
8775 * @dev: device to init
8777 * This takes a network device structure and initialize the minimum
8778 * amount of fields so it can be used to schedule NAPI polls without
8779 * registering a full blown interface. This is to be used by drivers
8780 * that need to tie several hardware interfaces to a single NAPI
8781 * poll scheduler due to HW limitations.
8783 int init_dummy_netdev(struct net_device *dev)
8785 /* Clear everything. Note we don't initialize spinlocks
8786 * are they aren't supposed to be taken by any of the
8787 * NAPI code and this dummy netdev is supposed to be
8788 * only ever used for NAPI polls
8790 memset(dev, 0, sizeof(struct net_device));
8792 /* make sure we BUG if trying to hit standard
8793 * register/unregister code path
8795 dev->reg_state = NETREG_DUMMY;
8797 /* NAPI wants this */
8798 INIT_LIST_HEAD(&dev->napi_list);
8800 /* a dummy interface is started by default */
8801 set_bit(__LINK_STATE_PRESENT, &dev->state);
8802 set_bit(__LINK_STATE_START, &dev->state);
8804 /* napi_busy_loop stats accounting wants this */
8805 dev_net_set(dev, &init_net);
8807 /* Note : We dont allocate pcpu_refcnt for dummy devices,
8808 * because users of this 'device' dont need to change
8814 EXPORT_SYMBOL_GPL(init_dummy_netdev);
8818 * register_netdev - register a network device
8819 * @dev: device to register
8821 * Take a completed network device structure and add it to the kernel
8822 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
8823 * chain. 0 is returned on success. A negative errno code is returned
8824 * on a failure to set up the device, or if the name is a duplicate.
8826 * This is a wrapper around register_netdevice that takes the rtnl semaphore
8827 * and expands the device name if you passed a format string to
8830 int register_netdev(struct net_device *dev)
8834 if (rtnl_lock_killable())
8836 err = register_netdevice(dev);
8840 EXPORT_SYMBOL(register_netdev);
8842 int netdev_refcnt_read(const struct net_device *dev)
8846 for_each_possible_cpu(i)
8847 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
8850 EXPORT_SYMBOL(netdev_refcnt_read);
8853 * netdev_wait_allrefs - wait until all references are gone.
8854 * @dev: target net_device
8856 * This is called when unregistering network devices.
8858 * Any protocol or device that holds a reference should register
8859 * for netdevice notification, and cleanup and put back the
8860 * reference if they receive an UNREGISTER event.
8861 * We can get stuck here if buggy protocols don't correctly
8864 static void netdev_wait_allrefs(struct net_device *dev)
8866 unsigned long rebroadcast_time, warning_time;
8869 linkwatch_forget_dev(dev);
8871 rebroadcast_time = warning_time = jiffies;
8872 refcnt = netdev_refcnt_read(dev);
8874 while (refcnt != 0) {
8875 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
8878 /* Rebroadcast unregister notification */
8879 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
8885 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
8887 /* We must not have linkwatch events
8888 * pending on unregister. If this
8889 * happens, we simply run the queue
8890 * unscheduled, resulting in a noop
8893 linkwatch_run_queue();
8898 rebroadcast_time = jiffies;
8903 refcnt = netdev_refcnt_read(dev);
8905 if (time_after(jiffies, warning_time + 10 * HZ)) {
8906 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
8908 warning_time = jiffies;
8917 * register_netdevice(x1);
8918 * register_netdevice(x2);
8920 * unregister_netdevice(y1);
8921 * unregister_netdevice(y2);
8927 * We are invoked by rtnl_unlock().
8928 * This allows us to deal with problems:
8929 * 1) We can delete sysfs objects which invoke hotplug
8930 * without deadlocking with linkwatch via keventd.
8931 * 2) Since we run with the RTNL semaphore not held, we can sleep
8932 * safely in order to wait for the netdev refcnt to drop to zero.
8934 * We must not return until all unregister events added during
8935 * the interval the lock was held have been completed.
8937 void netdev_run_todo(void)
8939 struct list_head list;
8941 /* Snapshot list, allow later requests */
8942 list_replace_init(&net_todo_list, &list);
8947 /* Wait for rcu callbacks to finish before next phase */
8948 if (!list_empty(&list))
8951 while (!list_empty(&list)) {
8952 struct net_device *dev
8953 = list_first_entry(&list, struct net_device, todo_list);
8954 list_del(&dev->todo_list);
8956 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
8957 pr_err("network todo '%s' but state %d\n",
8958 dev->name, dev->reg_state);
8963 dev->reg_state = NETREG_UNREGISTERED;
8965 netdev_wait_allrefs(dev);
8968 BUG_ON(netdev_refcnt_read(dev));
8969 BUG_ON(!list_empty(&dev->ptype_all));
8970 BUG_ON(!list_empty(&dev->ptype_specific));
8971 WARN_ON(rcu_access_pointer(dev->ip_ptr));
8972 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
8973 #if IS_ENABLED(CONFIG_DECNET)
8974 WARN_ON(dev->dn_ptr);
8976 if (dev->priv_destructor)
8977 dev->priv_destructor(dev);
8978 if (dev->needs_free_netdev)
8981 /* Report a network device has been unregistered */
8983 dev_net(dev)->dev_unreg_count--;
8985 wake_up(&netdev_unregistering_wq);
8987 /* Free network device */
8988 kobject_put(&dev->dev.kobj);
8992 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
8993 * all the same fields in the same order as net_device_stats, with only
8994 * the type differing, but rtnl_link_stats64 may have additional fields
8995 * at the end for newer counters.
8997 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
8998 const struct net_device_stats *netdev_stats)
9000 #if BITS_PER_LONG == 64
9001 BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats));
9002 memcpy(stats64, netdev_stats, sizeof(*netdev_stats));
9003 /* zero out counters that only exist in rtnl_link_stats64 */
9004 memset((char *)stats64 + sizeof(*netdev_stats), 0,
9005 sizeof(*stats64) - sizeof(*netdev_stats));
9007 size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long);
9008 const unsigned long *src = (const unsigned long *)netdev_stats;
9009 u64 *dst = (u64 *)stats64;
9011 BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
9012 for (i = 0; i < n; i++)
9014 /* zero out counters that only exist in rtnl_link_stats64 */
9015 memset((char *)stats64 + n * sizeof(u64), 0,
9016 sizeof(*stats64) - n * sizeof(u64));
9019 EXPORT_SYMBOL(netdev_stats_to_stats64);
9022 * dev_get_stats - get network device statistics
9023 * @dev: device to get statistics from
9024 * @storage: place to store stats
9026 * Get network statistics from device. Return @storage.
9027 * The device driver may provide its own method by setting
9028 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
9029 * otherwise the internal statistics structure is used.
9031 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
9032 struct rtnl_link_stats64 *storage)
9034 const struct net_device_ops *ops = dev->netdev_ops;
9036 if (ops->ndo_get_stats64) {
9037 memset(storage, 0, sizeof(*storage));
9038 ops->ndo_get_stats64(dev, storage);
9039 } else if (ops->ndo_get_stats) {
9040 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
9042 netdev_stats_to_stats64(storage, &dev->stats);
9044 storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped);
9045 storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped);
9046 storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler);
9049 EXPORT_SYMBOL(dev_get_stats);
9051 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
9053 struct netdev_queue *queue = dev_ingress_queue(dev);
9055 #ifdef CONFIG_NET_CLS_ACT
9058 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
9061 netdev_init_one_queue(dev, queue, NULL);
9062 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
9063 queue->qdisc_sleeping = &noop_qdisc;
9064 rcu_assign_pointer(dev->ingress_queue, queue);
9069 static const struct ethtool_ops default_ethtool_ops;
9071 void netdev_set_default_ethtool_ops(struct net_device *dev,
9072 const struct ethtool_ops *ops)
9074 if (dev->ethtool_ops == &default_ethtool_ops)
9075 dev->ethtool_ops = ops;
9077 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
9079 void netdev_freemem(struct net_device *dev)
9081 char *addr = (char *)dev - dev->padded;
9087 * alloc_netdev_mqs - allocate network device
9088 * @sizeof_priv: size of private data to allocate space for
9089 * @name: device name format string
9090 * @name_assign_type: origin of device name
9091 * @setup: callback to initialize device
9092 * @txqs: the number of TX subqueues to allocate
9093 * @rxqs: the number of RX subqueues to allocate
9095 * Allocates a struct net_device with private data area for driver use
9096 * and performs basic initialization. Also allocates subqueue structs
9097 * for each queue on the device.
9099 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
9100 unsigned char name_assign_type,
9101 void (*setup)(struct net_device *),
9102 unsigned int txqs, unsigned int rxqs)
9104 struct net_device *dev;
9105 unsigned int alloc_size;
9106 struct net_device *p;
9108 BUG_ON(strlen(name) >= sizeof(dev->name));
9111 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
9116 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
9120 alloc_size = sizeof(struct net_device);
9122 /* ensure 32-byte alignment of private area */
9123 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
9124 alloc_size += sizeof_priv;
9126 /* ensure 32-byte alignment of whole construct */
9127 alloc_size += NETDEV_ALIGN - 1;
9129 p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
9133 dev = PTR_ALIGN(p, NETDEV_ALIGN);
9134 dev->padded = (char *)dev - (char *)p;
9136 dev->pcpu_refcnt = alloc_percpu(int);
9137 if (!dev->pcpu_refcnt)
9140 if (dev_addr_init(dev))
9146 dev_net_set(dev, &init_net);
9148 dev->gso_max_size = GSO_MAX_SIZE;
9149 dev->gso_max_segs = GSO_MAX_SEGS;
9151 INIT_LIST_HEAD(&dev->napi_list);
9152 INIT_LIST_HEAD(&dev->unreg_list);
9153 INIT_LIST_HEAD(&dev->close_list);
9154 INIT_LIST_HEAD(&dev->link_watch_list);
9155 INIT_LIST_HEAD(&dev->adj_list.upper);
9156 INIT_LIST_HEAD(&dev->adj_list.lower);
9157 INIT_LIST_HEAD(&dev->ptype_all);
9158 INIT_LIST_HEAD(&dev->ptype_specific);
9159 #ifdef CONFIG_NET_SCHED
9160 hash_init(dev->qdisc_hash);
9162 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
9165 if (!dev->tx_queue_len) {
9166 dev->priv_flags |= IFF_NO_QUEUE;
9167 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
9170 dev->num_tx_queues = txqs;
9171 dev->real_num_tx_queues = txqs;
9172 if (netif_alloc_netdev_queues(dev))
9175 dev->num_rx_queues = rxqs;
9176 dev->real_num_rx_queues = rxqs;
9177 if (netif_alloc_rx_queues(dev))
9180 strcpy(dev->name, name);
9181 dev->name_assign_type = name_assign_type;
9182 dev->group = INIT_NETDEV_GROUP;
9183 if (!dev->ethtool_ops)
9184 dev->ethtool_ops = &default_ethtool_ops;
9186 nf_hook_ingress_init(dev);
9195 free_percpu(dev->pcpu_refcnt);
9197 netdev_freemem(dev);
9200 EXPORT_SYMBOL(alloc_netdev_mqs);
9203 * free_netdev - free network device
9206 * This function does the last stage of destroying an allocated device
9207 * interface. The reference to the device object is released. If this
9208 * is the last reference then it will be freed.Must be called in process
9211 void free_netdev(struct net_device *dev)
9213 struct napi_struct *p, *n;
9216 netif_free_tx_queues(dev);
9217 netif_free_rx_queues(dev);
9219 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
9221 /* Flush device addresses */
9222 dev_addr_flush(dev);
9224 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
9227 free_percpu(dev->pcpu_refcnt);
9228 dev->pcpu_refcnt = NULL;
9230 /* Compatibility with error handling in drivers */
9231 if (dev->reg_state == NETREG_UNINITIALIZED) {
9232 netdev_freemem(dev);
9236 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
9237 dev->reg_state = NETREG_RELEASED;
9239 /* will free via device release */
9240 put_device(&dev->dev);
9242 EXPORT_SYMBOL(free_netdev);
9245 * synchronize_net - Synchronize with packet receive processing
9247 * Wait for packets currently being received to be done.
9248 * Does not block later packets from starting.
9250 void synchronize_net(void)
9253 if (rtnl_is_locked())
9254 synchronize_rcu_expedited();
9258 EXPORT_SYMBOL(synchronize_net);
9261 * unregister_netdevice_queue - remove device from the kernel
9265 * This function shuts down a device interface and removes it
9266 * from the kernel tables.
9267 * If head not NULL, device is queued to be unregistered later.
9269 * Callers must hold the rtnl semaphore. You may want
9270 * unregister_netdev() instead of this.
9273 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
9278 list_move_tail(&dev->unreg_list, head);
9280 rollback_registered(dev);
9281 /* Finish processing unregister after unlock */
9285 EXPORT_SYMBOL(unregister_netdevice_queue);
9288 * unregister_netdevice_many - unregister many devices
9289 * @head: list of devices
9291 * Note: As most callers use a stack allocated list_head,
9292 * we force a list_del() to make sure stack wont be corrupted later.
9294 void unregister_netdevice_many(struct list_head *head)
9296 struct net_device *dev;
9298 if (!list_empty(head)) {
9299 rollback_registered_many(head);
9300 list_for_each_entry(dev, head, unreg_list)
9305 EXPORT_SYMBOL(unregister_netdevice_many);
9308 * unregister_netdev - remove device from the kernel
9311 * This function shuts down a device interface and removes it
9312 * from the kernel tables.
9314 * This is just a wrapper for unregister_netdevice that takes
9315 * the rtnl semaphore. In general you want to use this and not
9316 * unregister_netdevice.
9318 void unregister_netdev(struct net_device *dev)
9321 unregister_netdevice(dev);
9324 EXPORT_SYMBOL(unregister_netdev);
9327 * dev_change_net_namespace - move device to different nethost namespace
9329 * @net: network namespace
9330 * @pat: If not NULL name pattern to try if the current device name
9331 * is already taken in the destination network namespace.
9333 * This function shuts down a device interface and moves it
9334 * to a new network namespace. On success 0 is returned, on
9335 * a failure a netagive errno code is returned.
9337 * Callers must hold the rtnl semaphore.
9340 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
9342 int err, new_nsid, new_ifindex;
9346 /* Don't allow namespace local devices to be moved. */
9348 if (dev->features & NETIF_F_NETNS_LOCAL)
9351 /* Ensure the device has been registrered */
9352 if (dev->reg_state != NETREG_REGISTERED)
9355 /* Get out if there is nothing todo */
9357 if (net_eq(dev_net(dev), net))
9360 /* Pick the destination device name, and ensure
9361 * we can use it in the destination network namespace.
9364 if (__dev_get_by_name(net, dev->name)) {
9365 /* We get here if we can't use the current device name */
9368 err = dev_get_valid_name(net, dev, pat);
9374 * And now a mini version of register_netdevice unregister_netdevice.
9377 /* If device is running close it first. */
9380 /* And unlink it from device chain */
9381 unlist_netdevice(dev);
9385 /* Shutdown queueing discipline. */
9388 /* Notify protocols, that we are about to destroy
9389 * this device. They should clean all the things.
9391 * Note that dev->reg_state stays at NETREG_REGISTERED.
9392 * This is wanted because this way 8021q and macvlan know
9393 * the device is just moving and can keep their slaves up.
9395 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
9398 new_nsid = peernet2id_alloc(dev_net(dev), net);
9399 /* If there is an ifindex conflict assign a new one */
9400 if (__dev_get_by_index(net, dev->ifindex))
9401 new_ifindex = dev_new_index(net);
9403 new_ifindex = dev->ifindex;
9405 rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid,
9409 * Flush the unicast and multicast chains
9414 /* Send a netdev-removed uevent to the old namespace */
9415 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
9416 netdev_adjacent_del_links(dev);
9418 /* Actually switch the network namespace */
9419 dev_net_set(dev, net);
9420 dev->ifindex = new_ifindex;
9422 /* Send a netdev-add uevent to the new namespace */
9423 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
9424 netdev_adjacent_add_links(dev);
9426 /* Fixup kobjects */
9427 err = device_rename(&dev->dev, dev->name);
9430 /* Add the device back in the hashes */
9431 list_netdevice(dev);
9433 /* Notify protocols, that a new device appeared. */
9434 call_netdevice_notifiers(NETDEV_REGISTER, dev);
9437 * Prevent userspace races by waiting until the network
9438 * device is fully setup before sending notifications.
9440 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
9447 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
9449 static int dev_cpu_dead(unsigned int oldcpu)
9451 struct sk_buff **list_skb;
9452 struct sk_buff *skb;
9454 struct softnet_data *sd, *oldsd, *remsd = NULL;
9456 local_irq_disable();
9457 cpu = smp_processor_id();
9458 sd = &per_cpu(softnet_data, cpu);
9459 oldsd = &per_cpu(softnet_data, oldcpu);
9461 /* Find end of our completion_queue. */
9462 list_skb = &sd->completion_queue;
9464 list_skb = &(*list_skb)->next;
9465 /* Append completion queue from offline CPU. */
9466 *list_skb = oldsd->completion_queue;
9467 oldsd->completion_queue = NULL;
9469 /* Append output queue from offline CPU. */
9470 if (oldsd->output_queue) {
9471 *sd->output_queue_tailp = oldsd->output_queue;
9472 sd->output_queue_tailp = oldsd->output_queue_tailp;
9473 oldsd->output_queue = NULL;
9474 oldsd->output_queue_tailp = &oldsd->output_queue;
9476 /* Append NAPI poll list from offline CPU, with one exception :
9477 * process_backlog() must be called by cpu owning percpu backlog.
9478 * We properly handle process_queue & input_pkt_queue later.
9480 while (!list_empty(&oldsd->poll_list)) {
9481 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
9485 list_del_init(&napi->poll_list);
9486 if (napi->poll == process_backlog)
9489 ____napi_schedule(sd, napi);
9492 raise_softirq_irqoff(NET_TX_SOFTIRQ);
9496 remsd = oldsd->rps_ipi_list;
9497 oldsd->rps_ipi_list = NULL;
9499 /* send out pending IPI's on offline CPU */
9500 net_rps_send_ipi(remsd);
9502 /* Process offline CPU's input_pkt_queue */
9503 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
9505 input_queue_head_incr(oldsd);
9507 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
9509 input_queue_head_incr(oldsd);
9516 * netdev_increment_features - increment feature set by one
9517 * @all: current feature set
9518 * @one: new feature set
9519 * @mask: mask feature set
9521 * Computes a new feature set after adding a device with feature set
9522 * @one to the master device with current feature set @all. Will not
9523 * enable anything that is off in @mask. Returns the new feature set.
9525 netdev_features_t netdev_increment_features(netdev_features_t all,
9526 netdev_features_t one, netdev_features_t mask)
9528 if (mask & NETIF_F_HW_CSUM)
9529 mask |= NETIF_F_CSUM_MASK;
9530 mask |= NETIF_F_VLAN_CHALLENGED;
9532 all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask;
9533 all &= one | ~NETIF_F_ALL_FOR_ALL;
9535 /* If one device supports hw checksumming, set for all. */
9536 if (all & NETIF_F_HW_CSUM)
9537 all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);
9541 EXPORT_SYMBOL(netdev_increment_features);
9543 static struct hlist_head * __net_init netdev_create_hash(void)
9546 struct hlist_head *hash;
9548 hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL);
9550 for (i = 0; i < NETDEV_HASHENTRIES; i++)
9551 INIT_HLIST_HEAD(&hash[i]);
9556 /* Initialize per network namespace state */
9557 static int __net_init netdev_init(struct net *net)
9559 BUILD_BUG_ON(GRO_HASH_BUCKETS >
9560 8 * FIELD_SIZEOF(struct napi_struct, gro_bitmask));
9562 if (net != &init_net)
9563 INIT_LIST_HEAD(&net->dev_base_head);
9565 net->dev_name_head = netdev_create_hash();
9566 if (net->dev_name_head == NULL)
9569 net->dev_index_head = netdev_create_hash();
9570 if (net->dev_index_head == NULL)
9576 kfree(net->dev_name_head);
9582 * netdev_drivername - network driver for the device
9583 * @dev: network device
9585 * Determine network driver for device.
9587 const char *netdev_drivername(const struct net_device *dev)
9589 const struct device_driver *driver;
9590 const struct device *parent;
9591 const char *empty = "";
9593 parent = dev->dev.parent;
9597 driver = parent->driver;
9598 if (driver && driver->name)
9599 return driver->name;
9603 static void __netdev_printk(const char *level, const struct net_device *dev,
9604 struct va_format *vaf)
9606 if (dev && dev->dev.parent) {
9607 dev_printk_emit(level[1] - '0',
9610 dev_driver_string(dev->dev.parent),
9611 dev_name(dev->dev.parent),
9612 netdev_name(dev), netdev_reg_state(dev),
9615 printk("%s%s%s: %pV",
9616 level, netdev_name(dev), netdev_reg_state(dev), vaf);
9618 printk("%s(NULL net_device): %pV", level, vaf);
9622 void netdev_printk(const char *level, const struct net_device *dev,
9623 const char *format, ...)
9625 struct va_format vaf;
9628 va_start(args, format);
9633 __netdev_printk(level, dev, &vaf);
9637 EXPORT_SYMBOL(netdev_printk);
9639 #define define_netdev_printk_level(func, level) \
9640 void func(const struct net_device *dev, const char *fmt, ...) \
9642 struct va_format vaf; \
9645 va_start(args, fmt); \
9650 __netdev_printk(level, dev, &vaf); \
9654 EXPORT_SYMBOL(func);
9656 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
9657 define_netdev_printk_level(netdev_alert, KERN_ALERT);
9658 define_netdev_printk_level(netdev_crit, KERN_CRIT);
9659 define_netdev_printk_level(netdev_err, KERN_ERR);
9660 define_netdev_printk_level(netdev_warn, KERN_WARNING);
9661 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
9662 define_netdev_printk_level(netdev_info, KERN_INFO);
9664 static void __net_exit netdev_exit(struct net *net)
9666 kfree(net->dev_name_head);
9667 kfree(net->dev_index_head);
9668 if (net != &init_net)
9669 WARN_ON_ONCE(!list_empty(&net->dev_base_head));
9672 static struct pernet_operations __net_initdata netdev_net_ops = {
9673 .init = netdev_init,
9674 .exit = netdev_exit,
9677 static void __net_exit default_device_exit(struct net *net)
9679 struct net_device *dev, *aux;
9681 * Push all migratable network devices back to the
9682 * initial network namespace
9685 for_each_netdev_safe(net, dev, aux) {
9687 char fb_name[IFNAMSIZ];
9689 /* Ignore unmoveable devices (i.e. loopback) */
9690 if (dev->features & NETIF_F_NETNS_LOCAL)
9693 /* Leave virtual devices for the generic cleanup */
9694 if (dev->rtnl_link_ops)
9697 /* Push remaining network devices to init_net */
9698 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
9699 err = dev_change_net_namespace(dev, &init_net, fb_name);
9701 pr_emerg("%s: failed to move %s to init_net: %d\n",
9702 __func__, dev->name, err);
9709 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
9711 /* Return with the rtnl_lock held when there are no network
9712 * devices unregistering in any network namespace in net_list.
9716 DEFINE_WAIT_FUNC(wait, woken_wake_function);
9718 add_wait_queue(&netdev_unregistering_wq, &wait);
9720 unregistering = false;
9722 list_for_each_entry(net, net_list, exit_list) {
9723 if (net->dev_unreg_count > 0) {
9724 unregistering = true;
9732 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
9734 remove_wait_queue(&netdev_unregistering_wq, &wait);
9737 static void __net_exit default_device_exit_batch(struct list_head *net_list)
9739 /* At exit all network devices most be removed from a network
9740 * namespace. Do this in the reverse order of registration.
9741 * Do this across as many network namespaces as possible to
9742 * improve batching efficiency.
9744 struct net_device *dev;
9746 LIST_HEAD(dev_kill_list);
9748 /* To prevent network device cleanup code from dereferencing
9749 * loopback devices or network devices that have been freed
9750 * wait here for all pending unregistrations to complete,
9751 * before unregistring the loopback device and allowing the
9752 * network namespace be freed.
9754 * The netdev todo list containing all network devices
9755 * unregistrations that happen in default_device_exit_batch
9756 * will run in the rtnl_unlock() at the end of
9757 * default_device_exit_batch.
9759 rtnl_lock_unregistering(net_list);
9760 list_for_each_entry(net, net_list, exit_list) {
9761 for_each_netdev_reverse(net, dev) {
9762 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
9763 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
9765 unregister_netdevice_queue(dev, &dev_kill_list);
9768 unregister_netdevice_many(&dev_kill_list);
9772 static struct pernet_operations __net_initdata default_device_ops = {
9773 .exit = default_device_exit,
9774 .exit_batch = default_device_exit_batch,
9778 * Initialize the DEV module. At boot time this walks the device list and
9779 * unhooks any devices that fail to initialise (normally hardware not
9780 * present) and leaves us with a valid list of present and active devices.
9785 * This is called single threaded during boot, so no need
9786 * to take the rtnl semaphore.
9788 static int __init net_dev_init(void)
9790 int i, rc = -ENOMEM;
9792 BUG_ON(!dev_boot_phase);
9794 if (dev_proc_init())
9797 if (netdev_kobject_init())
9800 INIT_LIST_HEAD(&ptype_all);
9801 for (i = 0; i < PTYPE_HASH_SIZE; i++)
9802 INIT_LIST_HEAD(&ptype_base[i]);
9804 INIT_LIST_HEAD(&offload_base);
9806 if (register_pernet_subsys(&netdev_net_ops))
9810 * Initialise the packet receive queues.
9813 for_each_possible_cpu(i) {
9814 struct work_struct *flush = per_cpu_ptr(&flush_works, i);
9815 struct softnet_data *sd = &per_cpu(softnet_data, i);
9817 INIT_WORK(flush, flush_backlog);
9819 skb_queue_head_init(&sd->input_pkt_queue);
9820 skb_queue_head_init(&sd->process_queue);
9821 #ifdef CONFIG_XFRM_OFFLOAD
9822 skb_queue_head_init(&sd->xfrm_backlog);
9824 INIT_LIST_HEAD(&sd->poll_list);
9825 sd->output_queue_tailp = &sd->output_queue;
9827 sd->csd.func = rps_trigger_softirq;
9832 init_gro_hash(&sd->backlog);
9833 sd->backlog.poll = process_backlog;
9834 sd->backlog.weight = weight_p;
9839 /* The loopback device is special if any other network devices
9840 * is present in a network namespace the loopback device must
9841 * be present. Since we now dynamically allocate and free the
9842 * loopback device ensure this invariant is maintained by
9843 * keeping the loopback device as the first device on the
9844 * list of network devices. Ensuring the loopback devices
9845 * is the first device that appears and the last network device
9848 if (register_pernet_device(&loopback_net_ops))
9851 if (register_pernet_device(&default_device_ops))
9854 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
9855 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
9857 rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead",
9858 NULL, dev_cpu_dead);
9865 subsys_initcall(net_dev_init);