2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/proc_fs.h>
101 #include <linux/seq_file.h>
102 #include <linux/stat.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/wext.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
119 #include <linux/err.h>
120 #include <linux/ctype.h>
121 #include <linux/if_arp.h>
122 #include <linux/if_vlan.h>
123 #include <linux/ip.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/events/napi.h>
130 #include <trace/events/net.h>
131 #include <trace/events/skb.h>
132 #include <linux/pci.h>
133 #include <linux/inetdevice.h>
134 #include <linux/cpu_rmap.h>
135 #include <linux/net_tstamp.h>
136 #include <linux/static_key.h>
137 #include <net/flow_keys.h>
139 #include "net-sysfs.h"
141 /* Instead of increasing this, you should create a hash table. */
142 #define MAX_GRO_SKBS 8
144 /* This should be increased if a protocol with a bigger head is added. */
145 #define GRO_MAX_HEAD (MAX_HEADER + 128)
148 * The list of packet types we will receive (as opposed to discard)
149 * and the routines to invoke.
151 * Why 16. Because with 16 the only overlap we get on a hash of the
152 * low nibble of the protocol value is RARP/SNAP/X.25.
154 * NOTE: That is no longer true with the addition of VLAN tags. Not
155 * sure which should go first, but I bet it won't make much
156 * difference if we are running VLANs. The good news is that
157 * this protocol won't be in the list unless compiled in, so
158 * the average user (w/out VLANs) will not be adversely affected.
175 #define PTYPE_HASH_SIZE (16)
176 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
178 static DEFINE_SPINLOCK(ptype_lock);
179 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
180 static struct list_head ptype_all __read_mostly; /* Taps */
183 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
186 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
188 * Writers must hold the rtnl semaphore while they loop through the
189 * dev_base_head list, and hold dev_base_lock for writing when they do the
190 * actual updates. This allows pure readers to access the list even
191 * while a writer is preparing to update it.
193 * To put it another way, dev_base_lock is held for writing only to
194 * protect against pure readers; the rtnl semaphore provides the
195 * protection against other writers.
197 * See, for example usages, register_netdevice() and
198 * unregister_netdevice(), which must be called with the rtnl
201 DEFINE_RWLOCK(dev_base_lock);
202 EXPORT_SYMBOL(dev_base_lock);
204 static inline void dev_base_seq_inc(struct net *net)
206 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(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 int 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);
254 /* Device list removal
255 * caller must respect a RCU grace period before freeing/reusing dev
257 static void unlist_netdevice(struct net_device *dev)
261 /* Unlink dev from the device chain */
262 write_lock_bh(&dev_base_lock);
263 list_del_rcu(&dev->dev_list);
264 hlist_del_rcu(&dev->name_hlist);
265 hlist_del_rcu(&dev->index_hlist);
266 write_unlock_bh(&dev_base_lock);
268 dev_base_seq_inc(dev_net(dev));
275 static RAW_NOTIFIER_HEAD(netdev_chain);
278 * Device drivers call our routines to queue packets here. We empty the
279 * queue in the local softnet handler.
282 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
283 EXPORT_PER_CPU_SYMBOL(softnet_data);
285 #ifdef CONFIG_LOCKDEP
287 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
288 * according to dev->type
290 static const unsigned short netdev_lock_type[] =
291 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
292 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
293 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
294 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
295 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
296 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
297 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
298 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
299 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
300 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
301 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
302 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
303 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
304 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
305 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
307 static const char *const netdev_lock_name[] =
308 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
309 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
310 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
311 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
312 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
313 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
314 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
315 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
316 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
317 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
318 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
319 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
320 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
321 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
322 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
324 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
325 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
327 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
331 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
332 if (netdev_lock_type[i] == dev_type)
334 /* the last key is used by default */
335 return ARRAY_SIZE(netdev_lock_type) - 1;
338 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
339 unsigned short dev_type)
343 i = netdev_lock_pos(dev_type);
344 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
345 netdev_lock_name[i]);
348 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
352 i = netdev_lock_pos(dev->type);
353 lockdep_set_class_and_name(&dev->addr_list_lock,
354 &netdev_addr_lock_key[i],
355 netdev_lock_name[i]);
358 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
359 unsigned short dev_type)
362 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
367 /*******************************************************************************
369 Protocol management and registration routines
371 *******************************************************************************/
374 * Add a protocol ID to the list. Now that the input handler is
375 * smarter we can dispense with all the messy stuff that used to be
378 * BEWARE!!! Protocol handlers, mangling input packets,
379 * MUST BE last in hash buckets and checking protocol handlers
380 * MUST start from promiscuous ptype_all chain in net_bh.
381 * It is true now, do not change it.
382 * Explanation follows: if protocol handler, mangling packet, will
383 * be the first on list, it is not able to sense, that packet
384 * is cloned and should be copied-on-write, so that it will
385 * change it and subsequent readers will get broken packet.
389 static inline struct list_head *ptype_head(const struct packet_type *pt)
391 if (pt->type == htons(ETH_P_ALL))
394 return &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);
473 /******************************************************************************
475 Device Boot-time Settings Routines
477 *******************************************************************************/
479 /* Boot time configuration table */
480 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
483 * netdev_boot_setup_add - add new setup entry
484 * @name: name of the device
485 * @map: configured settings for the device
487 * Adds new setup entry to the dev_boot_setup list. The function
488 * returns 0 on error and 1 on success. This is a generic routine to
491 static int netdev_boot_setup_add(char *name, struct ifmap *map)
493 struct netdev_boot_setup *s;
497 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
498 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
499 memset(s[i].name, 0, sizeof(s[i].name));
500 strlcpy(s[i].name, name, IFNAMSIZ);
501 memcpy(&s[i].map, map, sizeof(s[i].map));
506 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
510 * netdev_boot_setup_check - check boot time settings
511 * @dev: the netdevice
513 * Check boot time settings for the device.
514 * The found settings are set for the device to be used
515 * later in the device probing.
516 * Returns 0 if no settings found, 1 if they are.
518 int netdev_boot_setup_check(struct net_device *dev)
520 struct netdev_boot_setup *s = dev_boot_setup;
523 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
524 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
525 !strcmp(dev->name, s[i].name)) {
526 dev->irq = s[i].map.irq;
527 dev->base_addr = s[i].map.base_addr;
528 dev->mem_start = s[i].map.mem_start;
529 dev->mem_end = s[i].map.mem_end;
535 EXPORT_SYMBOL(netdev_boot_setup_check);
539 * netdev_boot_base - get address from boot time settings
540 * @prefix: prefix for network device
541 * @unit: id for network device
543 * Check boot time settings for the base address of device.
544 * The found settings are set for the device to be used
545 * later in the device probing.
546 * Returns 0 if no settings found.
548 unsigned long netdev_boot_base(const char *prefix, int unit)
550 const struct netdev_boot_setup *s = dev_boot_setup;
554 sprintf(name, "%s%d", prefix, unit);
557 * If device already registered then return base of 1
558 * to indicate not to probe for this interface
560 if (__dev_get_by_name(&init_net, name))
563 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
564 if (!strcmp(name, s[i].name))
565 return s[i].map.base_addr;
570 * Saves at boot time configured settings for any netdevice.
572 int __init netdev_boot_setup(char *str)
577 str = get_options(str, ARRAY_SIZE(ints), ints);
582 memset(&map, 0, sizeof(map));
586 map.base_addr = ints[2];
588 map.mem_start = ints[3];
590 map.mem_end = ints[4];
592 /* Add new entry to the list */
593 return netdev_boot_setup_add(str, &map);
596 __setup("netdev=", netdev_boot_setup);
598 /*******************************************************************************
600 Device Interface Subroutines
602 *******************************************************************************/
605 * __dev_get_by_name - find a device by its name
606 * @net: the applicable net namespace
607 * @name: name to find
609 * Find an interface by name. Must be called under RTNL semaphore
610 * or @dev_base_lock. If the name is found a pointer to the device
611 * is returned. If the name is not found then %NULL is returned. The
612 * reference counters are not incremented so the caller must be
613 * careful with locks.
616 struct net_device *__dev_get_by_name(struct net *net, const char *name)
618 struct hlist_node *p;
619 struct net_device *dev;
620 struct hlist_head *head = dev_name_hash(net, name);
622 hlist_for_each_entry(dev, p, head, name_hlist)
623 if (!strncmp(dev->name, name, IFNAMSIZ))
628 EXPORT_SYMBOL(__dev_get_by_name);
631 * dev_get_by_name_rcu - find a device by its name
632 * @net: the applicable net namespace
633 * @name: name to find
635 * Find an interface by name.
636 * If the name is found a pointer to the device is returned.
637 * If the name is not found then %NULL is returned.
638 * The reference counters are not incremented so the caller must be
639 * careful with locks. The caller must hold RCU lock.
642 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
644 struct hlist_node *p;
645 struct net_device *dev;
646 struct hlist_head *head = dev_name_hash(net, name);
648 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
649 if (!strncmp(dev->name, name, IFNAMSIZ))
654 EXPORT_SYMBOL(dev_get_by_name_rcu);
657 * dev_get_by_name - find a device by its name
658 * @net: the applicable net namespace
659 * @name: name to find
661 * Find an interface by name. This can be called from any
662 * context and does its own locking. The returned handle has
663 * the usage count incremented and the caller must use dev_put() to
664 * release it when it is no longer needed. %NULL is returned if no
665 * matching device is found.
668 struct net_device *dev_get_by_name(struct net *net, const char *name)
670 struct net_device *dev;
673 dev = dev_get_by_name_rcu(net, name);
679 EXPORT_SYMBOL(dev_get_by_name);
682 * __dev_get_by_index - find a device by its ifindex
683 * @net: the applicable net namespace
684 * @ifindex: index of device
686 * Search for an interface by index. Returns %NULL if the device
687 * is not found or a pointer to the device. The device has not
688 * had its reference counter increased so the caller must be careful
689 * about locking. The caller must hold either the RTNL semaphore
693 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
695 struct hlist_node *p;
696 struct net_device *dev;
697 struct hlist_head *head = dev_index_hash(net, ifindex);
699 hlist_for_each_entry(dev, p, head, index_hlist)
700 if (dev->ifindex == ifindex)
705 EXPORT_SYMBOL(__dev_get_by_index);
708 * dev_get_by_index_rcu - find a device by its ifindex
709 * @net: the applicable net namespace
710 * @ifindex: index of device
712 * Search for an interface by index. Returns %NULL if the device
713 * is not found or a pointer to the device. The device has not
714 * had its reference counter increased so the caller must be careful
715 * about locking. The caller must hold RCU lock.
718 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
720 struct hlist_node *p;
721 struct net_device *dev;
722 struct hlist_head *head = dev_index_hash(net, ifindex);
724 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
725 if (dev->ifindex == ifindex)
730 EXPORT_SYMBOL(dev_get_by_index_rcu);
734 * dev_get_by_index - find a device by its ifindex
735 * @net: the applicable net namespace
736 * @ifindex: index of device
738 * Search for an interface by index. Returns NULL if the device
739 * is not found or a pointer to the device. The device returned has
740 * had a reference added and the pointer is safe until the user calls
741 * dev_put to indicate they have finished with it.
744 struct net_device *dev_get_by_index(struct net *net, int ifindex)
746 struct net_device *dev;
749 dev = dev_get_by_index_rcu(net, ifindex);
755 EXPORT_SYMBOL(dev_get_by_index);
758 * dev_getbyhwaddr_rcu - find a device by its hardware address
759 * @net: the applicable net namespace
760 * @type: media type of device
761 * @ha: hardware address
763 * Search for an interface by MAC address. Returns NULL if the device
764 * is not found or a pointer to the device.
765 * The caller must hold RCU or RTNL.
766 * The returned device has not had its ref count increased
767 * and the caller must therefore be careful about locking
771 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
774 struct net_device *dev;
776 for_each_netdev_rcu(net, dev)
777 if (dev->type == type &&
778 !memcmp(dev->dev_addr, ha, dev->addr_len))
783 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
785 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
787 struct net_device *dev;
790 for_each_netdev(net, dev)
791 if (dev->type == type)
796 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
798 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
800 struct net_device *dev, *ret = NULL;
803 for_each_netdev_rcu(net, dev)
804 if (dev->type == type) {
812 EXPORT_SYMBOL(dev_getfirstbyhwtype);
815 * dev_get_by_flags_rcu - find any device with given flags
816 * @net: the applicable net namespace
817 * @if_flags: IFF_* values
818 * @mask: bitmask of bits in if_flags to check
820 * Search for any interface with the given flags. Returns NULL if a device
821 * is not found or a pointer to the device. Must be called inside
822 * rcu_read_lock(), and result refcount is unchanged.
825 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
828 struct net_device *dev, *ret;
831 for_each_netdev_rcu(net, dev) {
832 if (((dev->flags ^ if_flags) & mask) == 0) {
839 EXPORT_SYMBOL(dev_get_by_flags_rcu);
842 * dev_valid_name - check if name is okay for network device
845 * Network device names need to be valid file names to
846 * to allow sysfs to work. We also disallow any kind of
849 bool dev_valid_name(const char *name)
853 if (strlen(name) >= IFNAMSIZ)
855 if (!strcmp(name, ".") || !strcmp(name, ".."))
859 if (*name == '/' || isspace(*name))
865 EXPORT_SYMBOL(dev_valid_name);
868 * __dev_alloc_name - allocate a name for a device
869 * @net: network namespace to allocate the device name in
870 * @name: name format string
871 * @buf: scratch buffer and result name string
873 * Passed a format string - eg "lt%d" it will try and find a suitable
874 * id. It scans list of devices to build up a free map, then chooses
875 * the first empty slot. The caller must hold the dev_base or rtnl lock
876 * while allocating the name and adding the device in order to avoid
878 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
879 * Returns the number of the unit assigned or a negative errno code.
882 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
886 const int max_netdevices = 8*PAGE_SIZE;
887 unsigned long *inuse;
888 struct net_device *d;
890 p = strnchr(name, IFNAMSIZ-1, '%');
893 * Verify the string as this thing may have come from
894 * the user. There must be either one "%d" and no other "%"
897 if (p[1] != 'd' || strchr(p + 2, '%'))
900 /* Use one page as a bit array of possible slots */
901 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
905 for_each_netdev(net, d) {
906 if (!sscanf(d->name, name, &i))
908 if (i < 0 || i >= max_netdevices)
911 /* avoid cases where sscanf is not exact inverse of printf */
912 snprintf(buf, IFNAMSIZ, name, i);
913 if (!strncmp(buf, d->name, IFNAMSIZ))
917 i = find_first_zero_bit(inuse, max_netdevices);
918 free_page((unsigned long) inuse);
922 snprintf(buf, IFNAMSIZ, name, i);
923 if (!__dev_get_by_name(net, buf))
926 /* It is possible to run out of possible slots
927 * when the name is long and there isn't enough space left
928 * for the digits, or if all bits are used.
934 * dev_alloc_name - allocate a name for a device
936 * @name: name format string
938 * Passed a format string - eg "lt%d" it will try and find a suitable
939 * id. It scans list of devices to build up a free map, then chooses
940 * the first empty slot. The caller must hold the dev_base or rtnl lock
941 * while allocating the name and adding the device in order to avoid
943 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
944 * Returns the number of the unit assigned or a negative errno code.
947 int dev_alloc_name(struct net_device *dev, const char *name)
953 BUG_ON(!dev_net(dev));
955 ret = __dev_alloc_name(net, name, buf);
957 strlcpy(dev->name, buf, IFNAMSIZ);
960 EXPORT_SYMBOL(dev_alloc_name);
962 static int dev_get_valid_name(struct net_device *dev, const char *name)
966 BUG_ON(!dev_net(dev));
969 if (!dev_valid_name(name))
972 if (strchr(name, '%'))
973 return dev_alloc_name(dev, name);
974 else if (__dev_get_by_name(net, name))
976 else if (dev->name != name)
977 strlcpy(dev->name, name, IFNAMSIZ);
983 * dev_change_name - change name of a device
985 * @newname: name (or format string) must be at least IFNAMSIZ
987 * Change name of a device, can pass format strings "eth%d".
990 int dev_change_name(struct net_device *dev, const char *newname)
992 char oldname[IFNAMSIZ];
998 BUG_ON(!dev_net(dev));
1001 if (dev->flags & IFF_UP)
1004 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1007 memcpy(oldname, dev->name, IFNAMSIZ);
1009 err = dev_get_valid_name(dev, newname);
1014 ret = device_rename(&dev->dev, dev->name);
1016 memcpy(dev->name, oldname, IFNAMSIZ);
1020 write_lock_bh(&dev_base_lock);
1021 hlist_del_rcu(&dev->name_hlist);
1022 write_unlock_bh(&dev_base_lock);
1026 write_lock_bh(&dev_base_lock);
1027 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1028 write_unlock_bh(&dev_base_lock);
1030 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1031 ret = notifier_to_errno(ret);
1034 /* err >= 0 after dev_alloc_name() or stores the first errno */
1037 memcpy(dev->name, oldname, IFNAMSIZ);
1040 pr_err("%s: name change rollback failed: %d\n",
1049 * dev_set_alias - change ifalias of a device
1051 * @alias: name up to IFALIASZ
1052 * @len: limit of bytes to copy from info
1054 * Set ifalias for a device,
1056 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1060 if (len >= IFALIASZ)
1065 kfree(dev->ifalias);
1066 dev->ifalias = NULL;
1071 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1075 strlcpy(dev->ifalias, alias, len+1);
1081 * netdev_features_change - device changes features
1082 * @dev: device to cause notification
1084 * Called to indicate a device has changed features.
1086 void netdev_features_change(struct net_device *dev)
1088 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1090 EXPORT_SYMBOL(netdev_features_change);
1093 * netdev_state_change - device changes state
1094 * @dev: device to cause notification
1096 * Called to indicate a device has changed state. This function calls
1097 * the notifier chains for netdev_chain and sends a NEWLINK message
1098 * to the routing socket.
1100 void netdev_state_change(struct net_device *dev)
1102 if (dev->flags & IFF_UP) {
1103 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1104 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1107 EXPORT_SYMBOL(netdev_state_change);
1109 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1111 return call_netdevice_notifiers(event, dev);
1113 EXPORT_SYMBOL(netdev_bonding_change);
1116 * dev_load - load a network module
1117 * @net: the applicable net namespace
1118 * @name: name of interface
1120 * If a network interface is not present and the process has suitable
1121 * privileges this function loads the module. If module loading is not
1122 * available in this kernel then it becomes a nop.
1125 void dev_load(struct net *net, const char *name)
1127 struct net_device *dev;
1131 dev = dev_get_by_name_rcu(net, name);
1135 if (no_module && capable(CAP_NET_ADMIN))
1136 no_module = request_module("netdev-%s", name);
1137 if (no_module && capable(CAP_SYS_MODULE)) {
1138 if (!request_module("%s", name))
1139 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1143 EXPORT_SYMBOL(dev_load);
1145 static int __dev_open(struct net_device *dev)
1147 const struct net_device_ops *ops = dev->netdev_ops;
1152 if (!netif_device_present(dev))
1155 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1156 ret = notifier_to_errno(ret);
1160 set_bit(__LINK_STATE_START, &dev->state);
1162 if (ops->ndo_validate_addr)
1163 ret = ops->ndo_validate_addr(dev);
1165 if (!ret && ops->ndo_open)
1166 ret = ops->ndo_open(dev);
1169 clear_bit(__LINK_STATE_START, &dev->state);
1171 dev->flags |= IFF_UP;
1172 net_dmaengine_get();
1173 dev_set_rx_mode(dev);
1175 add_device_randomness(dev->dev_addr, dev->addr_len);
1182 * dev_open - prepare an interface for use.
1183 * @dev: device to open
1185 * Takes a device from down to up state. The device's private open
1186 * function is invoked and then the multicast lists are loaded. Finally
1187 * the device is moved into the up state and a %NETDEV_UP message is
1188 * sent to the netdev notifier chain.
1190 * Calling this function on an active interface is a nop. On a failure
1191 * a negative errno code is returned.
1193 int dev_open(struct net_device *dev)
1197 if (dev->flags & IFF_UP)
1200 ret = __dev_open(dev);
1204 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1205 call_netdevice_notifiers(NETDEV_UP, dev);
1209 EXPORT_SYMBOL(dev_open);
1211 static int __dev_close_many(struct list_head *head)
1213 struct net_device *dev;
1218 list_for_each_entry(dev, head, unreg_list) {
1219 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1221 clear_bit(__LINK_STATE_START, &dev->state);
1223 /* Synchronize to scheduled poll. We cannot touch poll list, it
1224 * can be even on different cpu. So just clear netif_running().
1226 * dev->stop() will invoke napi_disable() on all of it's
1227 * napi_struct instances on this device.
1229 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1232 dev_deactivate_many(head);
1234 list_for_each_entry(dev, head, unreg_list) {
1235 const struct net_device_ops *ops = dev->netdev_ops;
1238 * Call the device specific close. This cannot fail.
1239 * Only if device is UP
1241 * We allow it to be called even after a DETACH hot-plug
1247 dev->flags &= ~IFF_UP;
1248 net_dmaengine_put();
1254 static int __dev_close(struct net_device *dev)
1259 list_add(&dev->unreg_list, &single);
1260 retval = __dev_close_many(&single);
1265 static int dev_close_many(struct list_head *head)
1267 struct net_device *dev, *tmp;
1268 LIST_HEAD(tmp_list);
1270 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1271 if (!(dev->flags & IFF_UP))
1272 list_move(&dev->unreg_list, &tmp_list);
1274 __dev_close_many(head);
1276 list_for_each_entry(dev, head, unreg_list) {
1277 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1278 call_netdevice_notifiers(NETDEV_DOWN, dev);
1281 /* rollback_registered_many needs the complete original list */
1282 list_splice(&tmp_list, head);
1287 * dev_close - shutdown an interface.
1288 * @dev: device to shutdown
1290 * This function moves an active device into down state. A
1291 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1292 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1295 int dev_close(struct net_device *dev)
1297 if (dev->flags & IFF_UP) {
1300 list_add(&dev->unreg_list, &single);
1301 dev_close_many(&single);
1306 EXPORT_SYMBOL(dev_close);
1310 * dev_disable_lro - disable Large Receive Offload on a device
1313 * Disable Large Receive Offload (LRO) on a net device. Must be
1314 * called under RTNL. This is needed if received packets may be
1315 * forwarded to another interface.
1317 void dev_disable_lro(struct net_device *dev)
1320 * If we're trying to disable lro on a vlan device
1321 * use the underlying physical device instead
1323 if (is_vlan_dev(dev))
1324 dev = vlan_dev_real_dev(dev);
1326 dev->wanted_features &= ~NETIF_F_LRO;
1327 netdev_update_features(dev);
1329 if (unlikely(dev->features & NETIF_F_LRO))
1330 netdev_WARN(dev, "failed to disable LRO!\n");
1332 EXPORT_SYMBOL(dev_disable_lro);
1335 static int dev_boot_phase = 1;
1338 * register_netdevice_notifier - register a network notifier block
1341 * Register a notifier to be called when network device events occur.
1342 * The notifier passed is linked into the kernel structures and must
1343 * not be reused until it has been unregistered. A negative errno code
1344 * is returned on a failure.
1346 * When registered all registration and up events are replayed
1347 * to the new notifier to allow device to have a race free
1348 * view of the network device list.
1351 int register_netdevice_notifier(struct notifier_block *nb)
1353 struct net_device *dev;
1354 struct net_device *last;
1359 err = raw_notifier_chain_register(&netdev_chain, nb);
1365 for_each_netdev(net, dev) {
1366 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1367 err = notifier_to_errno(err);
1371 if (!(dev->flags & IFF_UP))
1374 nb->notifier_call(nb, NETDEV_UP, dev);
1385 for_each_netdev(net, dev) {
1389 if (dev->flags & IFF_UP) {
1390 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1391 nb->notifier_call(nb, NETDEV_DOWN, dev);
1393 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1394 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1399 raw_notifier_chain_unregister(&netdev_chain, nb);
1402 EXPORT_SYMBOL(register_netdevice_notifier);
1405 * unregister_netdevice_notifier - unregister a network notifier block
1408 * Unregister a notifier previously registered by
1409 * register_netdevice_notifier(). The notifier is unlinked into the
1410 * kernel structures and may then be reused. A negative errno code
1411 * is returned on a failure.
1413 * After unregistering unregister and down device events are synthesized
1414 * for all devices on the device list to the removed notifier to remove
1415 * the need for special case cleanup code.
1418 int unregister_netdevice_notifier(struct notifier_block *nb)
1420 struct net_device *dev;
1425 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1430 for_each_netdev(net, dev) {
1431 if (dev->flags & IFF_UP) {
1432 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1433 nb->notifier_call(nb, NETDEV_DOWN, dev);
1435 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1436 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1443 EXPORT_SYMBOL(unregister_netdevice_notifier);
1446 * call_netdevice_notifiers - call all network notifier blocks
1447 * @val: value passed unmodified to notifier function
1448 * @dev: net_device pointer passed unmodified to notifier function
1450 * Call all network notifier blocks. Parameters and return value
1451 * are as for raw_notifier_call_chain().
1454 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1457 return raw_notifier_call_chain(&netdev_chain, val, dev);
1459 EXPORT_SYMBOL(call_netdevice_notifiers);
1461 static struct static_key netstamp_needed __read_mostly;
1462 #ifdef HAVE_JUMP_LABEL
1463 /* We are not allowed to call static_key_slow_dec() from irq context
1464 * If net_disable_timestamp() is called from irq context, defer the
1465 * static_key_slow_dec() calls.
1467 static atomic_t netstamp_needed_deferred;
1470 void net_enable_timestamp(void)
1472 #ifdef HAVE_JUMP_LABEL
1473 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1477 static_key_slow_dec(&netstamp_needed);
1481 WARN_ON(in_interrupt());
1482 static_key_slow_inc(&netstamp_needed);
1484 EXPORT_SYMBOL(net_enable_timestamp);
1486 void net_disable_timestamp(void)
1488 #ifdef HAVE_JUMP_LABEL
1489 if (in_interrupt()) {
1490 atomic_inc(&netstamp_needed_deferred);
1494 static_key_slow_dec(&netstamp_needed);
1496 EXPORT_SYMBOL(net_disable_timestamp);
1498 static inline void net_timestamp_set(struct sk_buff *skb)
1500 skb->tstamp.tv64 = 0;
1501 if (static_key_false(&netstamp_needed))
1502 __net_timestamp(skb);
1505 #define net_timestamp_check(COND, SKB) \
1506 if (static_key_false(&netstamp_needed)) { \
1507 if ((COND) && !(SKB)->tstamp.tv64) \
1508 __net_timestamp(SKB); \
1511 static int net_hwtstamp_validate(struct ifreq *ifr)
1513 struct hwtstamp_config cfg;
1514 enum hwtstamp_tx_types tx_type;
1515 enum hwtstamp_rx_filters rx_filter;
1516 int tx_type_valid = 0;
1517 int rx_filter_valid = 0;
1519 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1522 if (cfg.flags) /* reserved for future extensions */
1525 tx_type = cfg.tx_type;
1526 rx_filter = cfg.rx_filter;
1529 case HWTSTAMP_TX_OFF:
1530 case HWTSTAMP_TX_ON:
1531 case HWTSTAMP_TX_ONESTEP_SYNC:
1536 switch (rx_filter) {
1537 case HWTSTAMP_FILTER_NONE:
1538 case HWTSTAMP_FILTER_ALL:
1539 case HWTSTAMP_FILTER_SOME:
1540 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1541 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1542 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1543 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1544 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1545 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1546 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1547 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1548 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1549 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1550 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1551 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1552 rx_filter_valid = 1;
1556 if (!tx_type_valid || !rx_filter_valid)
1562 static inline bool is_skb_forwardable(struct net_device *dev,
1563 struct sk_buff *skb)
1567 if (!(dev->flags & IFF_UP))
1570 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1571 if (skb->len <= len)
1574 /* if TSO is enabled, we don't care about the length as the packet
1575 * could be forwarded without being segmented before
1577 if (skb_is_gso(skb))
1584 * dev_forward_skb - loopback an skb to another netif
1586 * @dev: destination network device
1587 * @skb: buffer to forward
1590 * NET_RX_SUCCESS (no congestion)
1591 * NET_RX_DROP (packet was dropped, but freed)
1593 * dev_forward_skb can be used for injecting an skb from the
1594 * start_xmit function of one device into the receive queue
1595 * of another device.
1597 * The receiving device may be in another namespace, so
1598 * we have to clear all information in the skb that could
1599 * impact namespace isolation.
1601 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1603 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1604 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1605 atomic_long_inc(&dev->rx_dropped);
1614 if (unlikely(!is_skb_forwardable(dev, skb))) {
1615 atomic_long_inc(&dev->rx_dropped);
1622 skb->tstamp.tv64 = 0;
1623 skb->pkt_type = PACKET_HOST;
1624 skb->protocol = eth_type_trans(skb, dev);
1628 return netif_rx(skb);
1630 EXPORT_SYMBOL_GPL(dev_forward_skb);
1632 static inline int deliver_skb(struct sk_buff *skb,
1633 struct packet_type *pt_prev,
1634 struct net_device *orig_dev)
1636 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1638 atomic_inc(&skb->users);
1639 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1643 * Support routine. Sends outgoing frames to any network
1644 * taps currently in use.
1647 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1649 struct packet_type *ptype;
1650 struct sk_buff *skb2 = NULL;
1651 struct packet_type *pt_prev = NULL;
1654 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1655 /* Never send packets back to the socket
1656 * they originated from - MvS (miquels@drinkel.ow.org)
1658 if ((ptype->dev == dev || !ptype->dev) &&
1659 (ptype->af_packet_priv == NULL ||
1660 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1662 deliver_skb(skb2, pt_prev, skb->dev);
1667 skb2 = skb_clone(skb, GFP_ATOMIC);
1671 net_timestamp_set(skb2);
1673 /* skb->nh should be correctly
1674 set by sender, so that the second statement is
1675 just protection against buggy protocols.
1677 skb_reset_mac_header(skb2);
1679 if (skb_network_header(skb2) < skb2->data ||
1680 skb2->network_header > skb2->tail) {
1681 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1682 ntohs(skb2->protocol),
1684 skb_reset_network_header(skb2);
1687 skb2->transport_header = skb2->network_header;
1688 skb2->pkt_type = PACKET_OUTGOING;
1693 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1698 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1699 * @dev: Network device
1700 * @txq: number of queues available
1702 * If real_num_tx_queues is changed the tc mappings may no longer be
1703 * valid. To resolve this verify the tc mapping remains valid and if
1704 * not NULL the mapping. With no priorities mapping to this
1705 * offset/count pair it will no longer be used. In the worst case TC0
1706 * is invalid nothing can be done so disable priority mappings. If is
1707 * expected that drivers will fix this mapping if they can before
1708 * calling netif_set_real_num_tx_queues.
1710 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1713 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1715 /* If TC0 is invalidated disable TC mapping */
1716 if (tc->offset + tc->count > txq) {
1717 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1722 /* Invalidated prio to tc mappings set to TC0 */
1723 for (i = 1; i < TC_BITMASK + 1; i++) {
1724 int q = netdev_get_prio_tc_map(dev, i);
1726 tc = &dev->tc_to_txq[q];
1727 if (tc->offset + tc->count > txq) {
1728 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1730 netdev_set_prio_tc_map(dev, i, 0);
1736 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1737 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1739 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1743 if (txq < 1 || txq > dev->num_tx_queues)
1746 if (dev->reg_state == NETREG_REGISTERED ||
1747 dev->reg_state == NETREG_UNREGISTERING) {
1750 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1756 netif_setup_tc(dev, txq);
1758 if (txq < dev->real_num_tx_queues)
1759 qdisc_reset_all_tx_gt(dev, txq);
1762 dev->real_num_tx_queues = txq;
1765 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1769 * netif_set_real_num_rx_queues - set actual number of RX queues used
1770 * @dev: Network device
1771 * @rxq: Actual number of RX queues
1773 * This must be called either with the rtnl_lock held or before
1774 * registration of the net device. Returns 0 on success, or a
1775 * negative error code. If called before registration, it always
1778 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1782 if (rxq < 1 || rxq > dev->num_rx_queues)
1785 if (dev->reg_state == NETREG_REGISTERED) {
1788 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1794 dev->real_num_rx_queues = rxq;
1797 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1801 * netif_get_num_default_rss_queues - default number of RSS queues
1803 * This routine should set an upper limit on the number of RSS queues
1804 * used by default by multiqueue devices.
1806 int netif_get_num_default_rss_queues(void)
1808 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
1810 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
1812 static inline void __netif_reschedule(struct Qdisc *q)
1814 struct softnet_data *sd;
1815 unsigned long flags;
1817 local_irq_save(flags);
1818 sd = &__get_cpu_var(softnet_data);
1819 q->next_sched = NULL;
1820 *sd->output_queue_tailp = q;
1821 sd->output_queue_tailp = &q->next_sched;
1822 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1823 local_irq_restore(flags);
1826 void __netif_schedule(struct Qdisc *q)
1828 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1829 __netif_reschedule(q);
1831 EXPORT_SYMBOL(__netif_schedule);
1833 void dev_kfree_skb_irq(struct sk_buff *skb)
1835 if (atomic_dec_and_test(&skb->users)) {
1836 struct softnet_data *sd;
1837 unsigned long flags;
1839 local_irq_save(flags);
1840 sd = &__get_cpu_var(softnet_data);
1841 skb->next = sd->completion_queue;
1842 sd->completion_queue = skb;
1843 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1844 local_irq_restore(flags);
1847 EXPORT_SYMBOL(dev_kfree_skb_irq);
1849 void dev_kfree_skb_any(struct sk_buff *skb)
1851 if (in_irq() || irqs_disabled())
1852 dev_kfree_skb_irq(skb);
1856 EXPORT_SYMBOL(dev_kfree_skb_any);
1860 * netif_device_detach - mark device as removed
1861 * @dev: network device
1863 * Mark device as removed from system and therefore no longer available.
1865 void netif_device_detach(struct net_device *dev)
1867 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1868 netif_running(dev)) {
1869 netif_tx_stop_all_queues(dev);
1872 EXPORT_SYMBOL(netif_device_detach);
1875 * netif_device_attach - mark device as attached
1876 * @dev: network device
1878 * Mark device as attached from system and restart if needed.
1880 void netif_device_attach(struct net_device *dev)
1882 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1883 netif_running(dev)) {
1884 netif_tx_wake_all_queues(dev);
1885 __netdev_watchdog_up(dev);
1888 EXPORT_SYMBOL(netif_device_attach);
1890 static void skb_warn_bad_offload(const struct sk_buff *skb)
1892 static const netdev_features_t null_features = 0;
1893 struct net_device *dev = skb->dev;
1894 const char *driver = "";
1896 if (dev && dev->dev.parent)
1897 driver = dev_driver_string(dev->dev.parent);
1899 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1900 "gso_type=%d ip_summed=%d\n",
1901 driver, dev ? &dev->features : &null_features,
1902 skb->sk ? &skb->sk->sk_route_caps : &null_features,
1903 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
1904 skb_shinfo(skb)->gso_type, skb->ip_summed);
1908 * Invalidate hardware checksum when packet is to be mangled, and
1909 * complete checksum manually on outgoing path.
1911 int skb_checksum_help(struct sk_buff *skb)
1914 int ret = 0, offset;
1916 if (skb->ip_summed == CHECKSUM_COMPLETE)
1917 goto out_set_summed;
1919 if (unlikely(skb_shinfo(skb)->gso_size)) {
1920 skb_warn_bad_offload(skb);
1924 offset = skb_checksum_start_offset(skb);
1925 BUG_ON(offset >= skb_headlen(skb));
1926 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1928 offset += skb->csum_offset;
1929 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1931 if (skb_cloned(skb) &&
1932 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1933 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1938 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1940 skb->ip_summed = CHECKSUM_NONE;
1944 EXPORT_SYMBOL(skb_checksum_help);
1947 * skb_gso_segment - Perform segmentation on skb.
1948 * @skb: buffer to segment
1949 * @features: features for the output path (see dev->features)
1951 * This function segments the given skb and returns a list of segments.
1953 * It may return NULL if the skb requires no segmentation. This is
1954 * only possible when GSO is used for verifying header integrity.
1956 struct sk_buff *skb_gso_segment(struct sk_buff *skb,
1957 netdev_features_t features)
1959 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1960 struct packet_type *ptype;
1961 __be16 type = skb->protocol;
1962 int vlan_depth = ETH_HLEN;
1965 while (type == htons(ETH_P_8021Q)) {
1966 struct vlan_hdr *vh;
1968 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1969 return ERR_PTR(-EINVAL);
1971 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1972 type = vh->h_vlan_encapsulated_proto;
1973 vlan_depth += VLAN_HLEN;
1976 skb_reset_mac_header(skb);
1977 skb->mac_len = skb->network_header - skb->mac_header;
1978 __skb_pull(skb, skb->mac_len);
1980 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1981 skb_warn_bad_offload(skb);
1983 if (skb_header_cloned(skb) &&
1984 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1985 return ERR_PTR(err);
1989 list_for_each_entry_rcu(ptype,
1990 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1991 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1992 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1993 err = ptype->gso_send_check(skb);
1994 segs = ERR_PTR(err);
1995 if (err || skb_gso_ok(skb, features))
1997 __skb_push(skb, (skb->data -
1998 skb_network_header(skb)));
2000 segs = ptype->gso_segment(skb, features);
2006 __skb_push(skb, skb->data - skb_mac_header(skb));
2010 EXPORT_SYMBOL(skb_gso_segment);
2012 /* Take action when hardware reception checksum errors are detected. */
2014 void netdev_rx_csum_fault(struct net_device *dev)
2016 if (net_ratelimit()) {
2017 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2021 EXPORT_SYMBOL(netdev_rx_csum_fault);
2024 /* Actually, we should eliminate this check as soon as we know, that:
2025 * 1. IOMMU is present and allows to map all the memory.
2026 * 2. No high memory really exists on this machine.
2029 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2031 #ifdef CONFIG_HIGHMEM
2033 if (!(dev->features & NETIF_F_HIGHDMA)) {
2034 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2035 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2036 if (PageHighMem(skb_frag_page(frag)))
2041 if (PCI_DMA_BUS_IS_PHYS) {
2042 struct device *pdev = dev->dev.parent;
2046 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2047 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2048 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2049 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2058 void (*destructor)(struct sk_buff *skb);
2061 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2063 static void dev_gso_skb_destructor(struct sk_buff *skb)
2065 struct dev_gso_cb *cb;
2068 struct sk_buff *nskb = skb->next;
2070 skb->next = nskb->next;
2073 } while (skb->next);
2075 cb = DEV_GSO_CB(skb);
2077 cb->destructor(skb);
2081 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2082 * @skb: buffer to segment
2083 * @features: device features as applicable to this skb
2085 * This function segments the given skb and stores the list of segments
2088 static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2090 struct sk_buff *segs;
2092 segs = skb_gso_segment(skb, features);
2094 /* Verifying header integrity only. */
2099 return PTR_ERR(segs);
2102 DEV_GSO_CB(skb)->destructor = skb->destructor;
2103 skb->destructor = dev_gso_skb_destructor;
2108 static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
2110 return ((features & NETIF_F_GEN_CSUM) ||
2111 ((features & NETIF_F_V4_CSUM) &&
2112 protocol == htons(ETH_P_IP)) ||
2113 ((features & NETIF_F_V6_CSUM) &&
2114 protocol == htons(ETH_P_IPV6)) ||
2115 ((features & NETIF_F_FCOE_CRC) &&
2116 protocol == htons(ETH_P_FCOE)));
2119 static netdev_features_t harmonize_features(struct sk_buff *skb,
2120 __be16 protocol, netdev_features_t features)
2122 if (!can_checksum_protocol(features, protocol)) {
2123 features &= ~NETIF_F_ALL_CSUM;
2124 features &= ~NETIF_F_SG;
2125 } else if (illegal_highdma(skb->dev, skb)) {
2126 features &= ~NETIF_F_SG;
2132 netdev_features_t netif_skb_features(struct sk_buff *skb)
2134 __be16 protocol = skb->protocol;
2135 netdev_features_t features = skb->dev->features;
2137 if (protocol == htons(ETH_P_8021Q)) {
2138 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2139 protocol = veh->h_vlan_encapsulated_proto;
2140 } else if (!vlan_tx_tag_present(skb)) {
2141 return harmonize_features(skb, protocol, features);
2144 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2146 if (protocol != htons(ETH_P_8021Q)) {
2147 return harmonize_features(skb, protocol, features);
2149 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2150 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2151 return harmonize_features(skb, protocol, features);
2154 EXPORT_SYMBOL(netif_skb_features);
2157 * Returns true if either:
2158 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2159 * 2. skb is fragmented and the device does not support SG, or if
2160 * at least one of fragments is in highmem and device does not
2161 * support DMA from it.
2163 static inline int skb_needs_linearize(struct sk_buff *skb,
2166 return skb_is_nonlinear(skb) &&
2167 ((skb_has_frag_list(skb) &&
2168 !(features & NETIF_F_FRAGLIST)) ||
2169 (skb_shinfo(skb)->nr_frags &&
2170 !(features & NETIF_F_SG)));
2173 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2174 struct netdev_queue *txq)
2176 const struct net_device_ops *ops = dev->netdev_ops;
2177 int rc = NETDEV_TX_OK;
2178 unsigned int skb_len;
2180 if (likely(!skb->next)) {
2181 netdev_features_t features;
2184 * If device doesn't need skb->dst, release it right now while
2185 * its hot in this cpu cache
2187 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2190 if (!list_empty(&ptype_all))
2191 dev_queue_xmit_nit(skb, dev);
2193 features = netif_skb_features(skb);
2195 if (vlan_tx_tag_present(skb) &&
2196 !(features & NETIF_F_HW_VLAN_TX)) {
2197 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2204 if (netif_needs_gso(skb, features)) {
2205 if (unlikely(dev_gso_segment(skb, features)))
2210 if (skb_needs_linearize(skb, features) &&
2211 __skb_linearize(skb))
2214 /* If packet is not checksummed and device does not
2215 * support checksumming for this protocol, complete
2216 * checksumming here.
2218 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2219 skb_set_transport_header(skb,
2220 skb_checksum_start_offset(skb));
2221 if (!(features & NETIF_F_ALL_CSUM) &&
2222 skb_checksum_help(skb))
2228 rc = ops->ndo_start_xmit(skb, dev);
2229 trace_net_dev_xmit(skb, rc, dev, skb_len);
2230 if (rc == NETDEV_TX_OK)
2231 txq_trans_update(txq);
2237 struct sk_buff *nskb = skb->next;
2239 skb->next = nskb->next;
2243 * If device doesn't need nskb->dst, release it right now while
2244 * its hot in this cpu cache
2246 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2249 skb_len = nskb->len;
2250 rc = ops->ndo_start_xmit(nskb, dev);
2251 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2252 if (unlikely(rc != NETDEV_TX_OK)) {
2253 if (rc & ~NETDEV_TX_MASK)
2254 goto out_kfree_gso_skb;
2255 nskb->next = skb->next;
2259 txq_trans_update(txq);
2260 if (unlikely(netif_xmit_stopped(txq) && skb->next))
2261 return NETDEV_TX_BUSY;
2262 } while (skb->next);
2265 if (likely(skb->next == NULL))
2266 skb->destructor = DEV_GSO_CB(skb)->destructor;
2273 static u32 hashrnd __read_mostly;
2276 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2277 * to be used as a distribution range.
2279 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2280 unsigned int num_tx_queues)
2284 u16 qcount = num_tx_queues;
2286 if (skb_rx_queue_recorded(skb)) {
2287 hash = skb_get_rx_queue(skb);
2288 while (unlikely(hash >= num_tx_queues))
2289 hash -= num_tx_queues;
2294 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2295 qoffset = dev->tc_to_txq[tc].offset;
2296 qcount = dev->tc_to_txq[tc].count;
2299 if (skb->sk && skb->sk->sk_hash)
2300 hash = skb->sk->sk_hash;
2302 hash = (__force u16) skb->protocol;
2303 hash = jhash_1word(hash, hashrnd);
2305 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2307 EXPORT_SYMBOL(__skb_tx_hash);
2309 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2311 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2312 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2313 dev->name, queue_index,
2314 dev->real_num_tx_queues);
2320 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2323 struct xps_dev_maps *dev_maps;
2324 struct xps_map *map;
2325 int queue_index = -1;
2328 dev_maps = rcu_dereference(dev->xps_maps);
2330 map = rcu_dereference(
2331 dev_maps->cpu_map[raw_smp_processor_id()]);
2334 queue_index = map->queues[0];
2337 if (skb->sk && skb->sk->sk_hash)
2338 hash = skb->sk->sk_hash;
2340 hash = (__force u16) skb->protocol ^
2342 hash = jhash_1word(hash, hashrnd);
2343 queue_index = map->queues[
2344 ((u64)hash * map->len) >> 32];
2346 if (unlikely(queue_index >= dev->real_num_tx_queues))
2358 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2359 struct sk_buff *skb)
2362 const struct net_device_ops *ops = dev->netdev_ops;
2364 if (dev->real_num_tx_queues == 1)
2366 else if (ops->ndo_select_queue) {
2367 queue_index = ops->ndo_select_queue(dev, skb);
2368 queue_index = dev_cap_txqueue(dev, queue_index);
2370 struct sock *sk = skb->sk;
2371 queue_index = sk_tx_queue_get(sk);
2373 if (queue_index < 0 || skb->ooo_okay ||
2374 queue_index >= dev->real_num_tx_queues) {
2375 int old_index = queue_index;
2377 queue_index = get_xps_queue(dev, skb);
2378 if (queue_index < 0)
2379 queue_index = skb_tx_hash(dev, skb);
2381 if (queue_index != old_index && sk) {
2382 struct dst_entry *dst =
2383 rcu_dereference_check(sk->sk_dst_cache, 1);
2385 if (dst && skb_dst(skb) == dst)
2386 sk_tx_queue_set(sk, queue_index);
2391 skb_set_queue_mapping(skb, queue_index);
2392 return netdev_get_tx_queue(dev, queue_index);
2395 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2396 struct net_device *dev,
2397 struct netdev_queue *txq)
2399 spinlock_t *root_lock = qdisc_lock(q);
2403 qdisc_skb_cb(skb)->pkt_len = skb->len;
2404 qdisc_calculate_pkt_len(skb, q);
2406 * Heuristic to force contended enqueues to serialize on a
2407 * separate lock before trying to get qdisc main lock.
2408 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2409 * and dequeue packets faster.
2411 contended = qdisc_is_running(q);
2412 if (unlikely(contended))
2413 spin_lock(&q->busylock);
2415 spin_lock(root_lock);
2416 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2419 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2420 qdisc_run_begin(q)) {
2422 * This is a work-conserving queue; there are no old skbs
2423 * waiting to be sent out; and the qdisc is not running -
2424 * xmit the skb directly.
2426 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2429 qdisc_bstats_update(q, skb);
2431 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2432 if (unlikely(contended)) {
2433 spin_unlock(&q->busylock);
2440 rc = NET_XMIT_SUCCESS;
2443 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2444 if (qdisc_run_begin(q)) {
2445 if (unlikely(contended)) {
2446 spin_unlock(&q->busylock);
2452 spin_unlock(root_lock);
2453 if (unlikely(contended))
2454 spin_unlock(&q->busylock);
2458 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2459 static void skb_update_prio(struct sk_buff *skb)
2461 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2463 if (!skb->priority && skb->sk && map) {
2464 unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
2466 if (prioidx < map->priomap_len)
2467 skb->priority = map->priomap[prioidx];
2471 #define skb_update_prio(skb)
2474 static DEFINE_PER_CPU(int, xmit_recursion);
2475 #define RECURSION_LIMIT 10
2478 * dev_loopback_xmit - loop back @skb
2479 * @skb: buffer to transmit
2481 int dev_loopback_xmit(struct sk_buff *skb)
2483 skb_reset_mac_header(skb);
2484 __skb_pull(skb, skb_network_offset(skb));
2485 skb->pkt_type = PACKET_LOOPBACK;
2486 skb->ip_summed = CHECKSUM_UNNECESSARY;
2487 WARN_ON(!skb_dst(skb));
2492 EXPORT_SYMBOL(dev_loopback_xmit);
2495 * dev_queue_xmit - transmit a buffer
2496 * @skb: buffer to transmit
2498 * Queue a buffer for transmission to a network device. The caller must
2499 * have set the device and priority and built the buffer before calling
2500 * this function. The function can be called from an interrupt.
2502 * A negative errno code is returned on a failure. A success does not
2503 * guarantee the frame will be transmitted as it may be dropped due
2504 * to congestion or traffic shaping.
2506 * -----------------------------------------------------------------------------------
2507 * I notice this method can also return errors from the queue disciplines,
2508 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2511 * Regardless of the return value, the skb is consumed, so it is currently
2512 * difficult to retry a send to this method. (You can bump the ref count
2513 * before sending to hold a reference for retry if you are careful.)
2515 * When calling this method, interrupts MUST be enabled. This is because
2516 * the BH enable code must have IRQs enabled so that it will not deadlock.
2519 int dev_queue_xmit(struct sk_buff *skb)
2521 struct net_device *dev = skb->dev;
2522 struct netdev_queue *txq;
2526 /* Disable soft irqs for various locks below. Also
2527 * stops preemption for RCU.
2531 skb_update_prio(skb);
2533 txq = dev_pick_tx(dev, skb);
2534 q = rcu_dereference_bh(txq->qdisc);
2536 #ifdef CONFIG_NET_CLS_ACT
2537 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2539 trace_net_dev_queue(skb);
2541 rc = __dev_xmit_skb(skb, q, dev, txq);
2545 /* The device has no queue. Common case for software devices:
2546 loopback, all the sorts of tunnels...
2548 Really, it is unlikely that netif_tx_lock protection is necessary
2549 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2551 However, it is possible, that they rely on protection
2554 Check this and shot the lock. It is not prone from deadlocks.
2555 Either shot noqueue qdisc, it is even simpler 8)
2557 if (dev->flags & IFF_UP) {
2558 int cpu = smp_processor_id(); /* ok because BHs are off */
2560 if (txq->xmit_lock_owner != cpu) {
2562 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2563 goto recursion_alert;
2565 HARD_TX_LOCK(dev, txq, cpu);
2567 if (!netif_xmit_stopped(txq)) {
2568 __this_cpu_inc(xmit_recursion);
2569 rc = dev_hard_start_xmit(skb, dev, txq);
2570 __this_cpu_dec(xmit_recursion);
2571 if (dev_xmit_complete(rc)) {
2572 HARD_TX_UNLOCK(dev, txq);
2576 HARD_TX_UNLOCK(dev, txq);
2577 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2580 /* Recursion is detected! It is possible,
2584 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2590 rcu_read_unlock_bh();
2595 rcu_read_unlock_bh();
2598 EXPORT_SYMBOL(dev_queue_xmit);
2601 /*=======================================================================
2603 =======================================================================*/
2605 int netdev_max_backlog __read_mostly = 1000;
2606 int netdev_tstamp_prequeue __read_mostly = 1;
2607 int netdev_budget __read_mostly = 300;
2608 int weight_p __read_mostly = 64; /* old backlog weight */
2610 /* Called with irq disabled */
2611 static inline void ____napi_schedule(struct softnet_data *sd,
2612 struct napi_struct *napi)
2614 list_add_tail(&napi->poll_list, &sd->poll_list);
2615 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2619 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2620 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2621 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2622 * if hash is a canonical 4-tuple hash over transport ports.
2624 void __skb_get_rxhash(struct sk_buff *skb)
2626 struct flow_keys keys;
2629 if (!skb_flow_dissect(skb, &keys))
2633 if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
2634 swap(keys.port16[0], keys.port16[1]);
2638 /* get a consistent hash (same value on both flow directions) */
2639 if ((__force u32)keys.dst < (__force u32)keys.src)
2640 swap(keys.dst, keys.src);
2642 hash = jhash_3words((__force u32)keys.dst,
2643 (__force u32)keys.src,
2644 (__force u32)keys.ports, hashrnd);
2650 EXPORT_SYMBOL(__skb_get_rxhash);
2654 /* One global table that all flow-based protocols share. */
2655 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2656 EXPORT_SYMBOL(rps_sock_flow_table);
2658 struct static_key rps_needed __read_mostly;
2660 static struct rps_dev_flow *
2661 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2662 struct rps_dev_flow *rflow, u16 next_cpu)
2664 if (next_cpu != RPS_NO_CPU) {
2665 #ifdef CONFIG_RFS_ACCEL
2666 struct netdev_rx_queue *rxqueue;
2667 struct rps_dev_flow_table *flow_table;
2668 struct rps_dev_flow *old_rflow;
2673 /* Should we steer this flow to a different hardware queue? */
2674 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2675 !(dev->features & NETIF_F_NTUPLE))
2677 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2678 if (rxq_index == skb_get_rx_queue(skb))
2681 rxqueue = dev->_rx + rxq_index;
2682 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2685 flow_id = skb->rxhash & flow_table->mask;
2686 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2687 rxq_index, flow_id);
2691 rflow = &flow_table->flows[flow_id];
2693 if (old_rflow->filter == rflow->filter)
2694 old_rflow->filter = RPS_NO_FILTER;
2698 per_cpu(softnet_data, next_cpu).input_queue_head;
2701 rflow->cpu = next_cpu;
2706 * get_rps_cpu is called from netif_receive_skb and returns the target
2707 * CPU from the RPS map of the receiving queue for a given skb.
2708 * rcu_read_lock must be held on entry.
2710 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2711 struct rps_dev_flow **rflowp)
2713 struct netdev_rx_queue *rxqueue;
2714 struct rps_map *map;
2715 struct rps_dev_flow_table *flow_table;
2716 struct rps_sock_flow_table *sock_flow_table;
2720 if (skb_rx_queue_recorded(skb)) {
2721 u16 index = skb_get_rx_queue(skb);
2722 if (unlikely(index >= dev->real_num_rx_queues)) {
2723 WARN_ONCE(dev->real_num_rx_queues > 1,
2724 "%s received packet on queue %u, but number "
2725 "of RX queues is %u\n",
2726 dev->name, index, dev->real_num_rx_queues);
2729 rxqueue = dev->_rx + index;
2733 map = rcu_dereference(rxqueue->rps_map);
2735 if (map->len == 1 &&
2736 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2737 tcpu = map->cpus[0];
2738 if (cpu_online(tcpu))
2742 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2746 skb_reset_network_header(skb);
2747 if (!skb_get_rxhash(skb))
2750 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2751 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2752 if (flow_table && sock_flow_table) {
2754 struct rps_dev_flow *rflow;
2756 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2759 next_cpu = sock_flow_table->ents[skb->rxhash &
2760 sock_flow_table->mask];
2763 * If the desired CPU (where last recvmsg was done) is
2764 * different from current CPU (one in the rx-queue flow
2765 * table entry), switch if one of the following holds:
2766 * - Current CPU is unset (equal to RPS_NO_CPU).
2767 * - Current CPU is offline.
2768 * - The current CPU's queue tail has advanced beyond the
2769 * last packet that was enqueued using this table entry.
2770 * This guarantees that all previous packets for the flow
2771 * have been dequeued, thus preserving in order delivery.
2773 if (unlikely(tcpu != next_cpu) &&
2774 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2775 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2776 rflow->last_qtail)) >= 0))
2777 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2779 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2787 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2789 if (cpu_online(tcpu)) {
2799 #ifdef CONFIG_RFS_ACCEL
2802 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2803 * @dev: Device on which the filter was set
2804 * @rxq_index: RX queue index
2805 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2806 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2808 * Drivers that implement ndo_rx_flow_steer() should periodically call
2809 * this function for each installed filter and remove the filters for
2810 * which it returns %true.
2812 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2813 u32 flow_id, u16 filter_id)
2815 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2816 struct rps_dev_flow_table *flow_table;
2817 struct rps_dev_flow *rflow;
2822 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2823 if (flow_table && flow_id <= flow_table->mask) {
2824 rflow = &flow_table->flows[flow_id];
2825 cpu = ACCESS_ONCE(rflow->cpu);
2826 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2827 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2828 rflow->last_qtail) <
2829 (int)(10 * flow_table->mask)))
2835 EXPORT_SYMBOL(rps_may_expire_flow);
2837 #endif /* CONFIG_RFS_ACCEL */
2839 /* Called from hardirq (IPI) context */
2840 static void rps_trigger_softirq(void *data)
2842 struct softnet_data *sd = data;
2844 ____napi_schedule(sd, &sd->backlog);
2848 #endif /* CONFIG_RPS */
2851 * Check if this softnet_data structure is another cpu one
2852 * If yes, queue it to our IPI list and return 1
2855 static int rps_ipi_queued(struct softnet_data *sd)
2858 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2861 sd->rps_ipi_next = mysd->rps_ipi_list;
2862 mysd->rps_ipi_list = sd;
2864 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2867 #endif /* CONFIG_RPS */
2872 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2873 * queue (may be a remote CPU queue).
2875 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2876 unsigned int *qtail)
2878 struct softnet_data *sd;
2879 unsigned long flags;
2881 sd = &per_cpu(softnet_data, cpu);
2883 local_irq_save(flags);
2886 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2887 if (skb_queue_len(&sd->input_pkt_queue)) {
2889 __skb_queue_tail(&sd->input_pkt_queue, skb);
2890 input_queue_tail_incr_save(sd, qtail);
2892 local_irq_restore(flags);
2893 return NET_RX_SUCCESS;
2896 /* Schedule NAPI for backlog device
2897 * We can use non atomic operation since we own the queue lock
2899 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2900 if (!rps_ipi_queued(sd))
2901 ____napi_schedule(sd, &sd->backlog);
2909 local_irq_restore(flags);
2911 atomic_long_inc(&skb->dev->rx_dropped);
2917 * netif_rx - post buffer to the network code
2918 * @skb: buffer to post
2920 * This function receives a packet from a device driver and queues it for
2921 * the upper (protocol) levels to process. It always succeeds. The buffer
2922 * may be dropped during processing for congestion control or by the
2926 * NET_RX_SUCCESS (no congestion)
2927 * NET_RX_DROP (packet was dropped)
2931 int netif_rx(struct sk_buff *skb)
2935 /* if netpoll wants it, pretend we never saw it */
2936 if (netpoll_rx(skb))
2939 net_timestamp_check(netdev_tstamp_prequeue, skb);
2941 trace_netif_rx(skb);
2943 if (static_key_false(&rps_needed)) {
2944 struct rps_dev_flow voidflow, *rflow = &voidflow;
2950 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2952 cpu = smp_processor_id();
2954 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2962 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2967 EXPORT_SYMBOL(netif_rx);
2969 int netif_rx_ni(struct sk_buff *skb)
2974 err = netif_rx(skb);
2975 if (local_softirq_pending())
2981 EXPORT_SYMBOL(netif_rx_ni);
2983 static void net_tx_action(struct softirq_action *h)
2985 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2987 if (sd->completion_queue) {
2988 struct sk_buff *clist;
2990 local_irq_disable();
2991 clist = sd->completion_queue;
2992 sd->completion_queue = NULL;
2996 struct sk_buff *skb = clist;
2997 clist = clist->next;
2999 WARN_ON(atomic_read(&skb->users));
3000 trace_kfree_skb(skb, net_tx_action);
3005 if (sd->output_queue) {
3008 local_irq_disable();
3009 head = sd->output_queue;
3010 sd->output_queue = NULL;
3011 sd->output_queue_tailp = &sd->output_queue;
3015 struct Qdisc *q = head;
3016 spinlock_t *root_lock;
3018 head = head->next_sched;
3020 root_lock = qdisc_lock(q);
3021 if (spin_trylock(root_lock)) {
3022 smp_mb__before_clear_bit();
3023 clear_bit(__QDISC_STATE_SCHED,
3026 spin_unlock(root_lock);
3028 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3030 __netif_reschedule(q);
3032 smp_mb__before_clear_bit();
3033 clear_bit(__QDISC_STATE_SCHED,
3041 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3042 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3043 /* This hook is defined here for ATM LANE */
3044 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3045 unsigned char *addr) __read_mostly;
3046 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3049 #ifdef CONFIG_NET_CLS_ACT
3050 /* TODO: Maybe we should just force sch_ingress to be compiled in
3051 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3052 * a compare and 2 stores extra right now if we dont have it on
3053 * but have CONFIG_NET_CLS_ACT
3054 * NOTE: This doesn't stop any functionality; if you dont have
3055 * the ingress scheduler, you just can't add policies on ingress.
3058 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3060 struct net_device *dev = skb->dev;
3061 u32 ttl = G_TC_RTTL(skb->tc_verd);
3062 int result = TC_ACT_OK;
3065 if (unlikely(MAX_RED_LOOP < ttl++)) {
3066 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3067 skb->skb_iif, dev->ifindex);
3071 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3072 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3075 if (q != &noop_qdisc) {
3076 spin_lock(qdisc_lock(q));
3077 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3078 result = qdisc_enqueue_root(skb, q);
3079 spin_unlock(qdisc_lock(q));
3085 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3086 struct packet_type **pt_prev,
3087 int *ret, struct net_device *orig_dev)
3089 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3091 if (!rxq || rxq->qdisc == &noop_qdisc)
3095 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3099 switch (ing_filter(skb, rxq)) {
3113 * netdev_rx_handler_register - register receive handler
3114 * @dev: device to register a handler for
3115 * @rx_handler: receive handler to register
3116 * @rx_handler_data: data pointer that is used by rx handler
3118 * Register a receive hander for a device. This handler will then be
3119 * called from __netif_receive_skb. A negative errno code is returned
3122 * The caller must hold the rtnl_mutex.
3124 * For a general description of rx_handler, see enum rx_handler_result.
3126 int netdev_rx_handler_register(struct net_device *dev,
3127 rx_handler_func_t *rx_handler,
3128 void *rx_handler_data)
3132 if (dev->rx_handler)
3135 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3136 rcu_assign_pointer(dev->rx_handler, rx_handler);
3140 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3143 * netdev_rx_handler_unregister - unregister receive handler
3144 * @dev: device to unregister a handler from
3146 * Unregister a receive hander from a device.
3148 * The caller must hold the rtnl_mutex.
3150 void netdev_rx_handler_unregister(struct net_device *dev)
3154 RCU_INIT_POINTER(dev->rx_handler, NULL);
3155 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3157 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3159 static int __netif_receive_skb(struct sk_buff *skb)
3161 struct packet_type *ptype, *pt_prev;
3162 rx_handler_func_t *rx_handler;
3163 struct net_device *orig_dev;
3164 struct net_device *null_or_dev;
3165 bool deliver_exact = false;
3166 int ret = NET_RX_DROP;
3169 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3171 trace_netif_receive_skb(skb);
3173 /* if we've gotten here through NAPI, check netpoll */
3174 if (netpoll_receive_skb(skb))
3177 orig_dev = skb->dev;
3179 skb_reset_network_header(skb);
3180 skb_reset_transport_header(skb);
3181 skb_reset_mac_len(skb);
3188 skb->skb_iif = skb->dev->ifindex;
3190 __this_cpu_inc(softnet_data.processed);
3192 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3193 skb = vlan_untag(skb);
3198 #ifdef CONFIG_NET_CLS_ACT
3199 if (skb->tc_verd & TC_NCLS) {
3200 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3205 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3206 if (!ptype->dev || ptype->dev == skb->dev) {
3208 ret = deliver_skb(skb, pt_prev, orig_dev);
3213 #ifdef CONFIG_NET_CLS_ACT
3214 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3220 rx_handler = rcu_dereference(skb->dev->rx_handler);
3221 if (vlan_tx_tag_present(skb)) {
3223 ret = deliver_skb(skb, pt_prev, orig_dev);
3226 if (vlan_do_receive(&skb, !rx_handler))
3228 else if (unlikely(!skb))
3234 ret = deliver_skb(skb, pt_prev, orig_dev);
3237 switch (rx_handler(&skb)) {
3238 case RX_HANDLER_CONSUMED:
3240 case RX_HANDLER_ANOTHER:
3242 case RX_HANDLER_EXACT:
3243 deliver_exact = true;
3244 case RX_HANDLER_PASS:
3251 /* deliver only exact match when indicated */
3252 null_or_dev = deliver_exact ? skb->dev : NULL;
3254 type = skb->protocol;
3255 list_for_each_entry_rcu(ptype,
3256 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3257 if (ptype->type == type &&
3258 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3259 ptype->dev == orig_dev)) {
3261 ret = deliver_skb(skb, pt_prev, orig_dev);
3267 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
3270 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3272 atomic_long_inc(&skb->dev->rx_dropped);
3274 /* Jamal, now you will not able to escape explaining
3275 * me how you were going to use this. :-)
3286 * netif_receive_skb - process receive buffer from network
3287 * @skb: buffer to process
3289 * netif_receive_skb() is the main receive data processing function.
3290 * It always succeeds. The buffer may be dropped during processing
3291 * for congestion control or by the protocol layers.
3293 * This function may only be called from softirq context and interrupts
3294 * should be enabled.
3296 * Return values (usually ignored):
3297 * NET_RX_SUCCESS: no congestion
3298 * NET_RX_DROP: packet was dropped
3300 int netif_receive_skb(struct sk_buff *skb)
3302 net_timestamp_check(netdev_tstamp_prequeue, skb);
3304 if (skb_defer_rx_timestamp(skb))
3305 return NET_RX_SUCCESS;
3308 if (static_key_false(&rps_needed)) {
3309 struct rps_dev_flow voidflow, *rflow = &voidflow;
3314 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3317 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3324 return __netif_receive_skb(skb);
3326 EXPORT_SYMBOL(netif_receive_skb);
3328 /* Network device is going away, flush any packets still pending
3329 * Called with irqs disabled.
3331 static void flush_backlog(void *arg)
3333 struct net_device *dev = arg;
3334 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3335 struct sk_buff *skb, *tmp;
3338 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3339 if (skb->dev == dev) {
3340 __skb_unlink(skb, &sd->input_pkt_queue);
3342 input_queue_head_incr(sd);
3347 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3348 if (skb->dev == dev) {
3349 __skb_unlink(skb, &sd->process_queue);
3351 input_queue_head_incr(sd);
3356 static int napi_gro_complete(struct sk_buff *skb)
3358 struct packet_type *ptype;
3359 __be16 type = skb->protocol;
3360 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3363 if (NAPI_GRO_CB(skb)->count == 1) {
3364 skb_shinfo(skb)->gso_size = 0;
3369 list_for_each_entry_rcu(ptype, head, list) {
3370 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3373 err = ptype->gro_complete(skb);
3379 WARN_ON(&ptype->list == head);
3381 return NET_RX_SUCCESS;
3385 return netif_receive_skb(skb);
3388 inline void napi_gro_flush(struct napi_struct *napi)
3390 struct sk_buff *skb, *next;
3392 for (skb = napi->gro_list; skb; skb = next) {
3395 napi_gro_complete(skb);
3398 napi->gro_count = 0;
3399 napi->gro_list = NULL;
3401 EXPORT_SYMBOL(napi_gro_flush);
3403 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3405 struct sk_buff **pp = NULL;
3406 struct packet_type *ptype;
3407 __be16 type = skb->protocol;
3408 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3411 enum gro_result ret;
3413 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3416 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3420 list_for_each_entry_rcu(ptype, head, list) {
3421 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3424 skb_set_network_header(skb, skb_gro_offset(skb));
3425 mac_len = skb->network_header - skb->mac_header;
3426 skb->mac_len = mac_len;
3427 NAPI_GRO_CB(skb)->same_flow = 0;
3428 NAPI_GRO_CB(skb)->flush = 0;
3429 NAPI_GRO_CB(skb)->free = 0;
3431 pp = ptype->gro_receive(&napi->gro_list, skb);
3436 if (&ptype->list == head)
3439 same_flow = NAPI_GRO_CB(skb)->same_flow;
3440 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3443 struct sk_buff *nskb = *pp;
3447 napi_gro_complete(nskb);
3454 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3458 NAPI_GRO_CB(skb)->count = 1;
3459 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3460 skb->next = napi->gro_list;
3461 napi->gro_list = skb;
3465 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3466 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3468 BUG_ON(skb->end - skb->tail < grow);
3470 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3473 skb->data_len -= grow;
3475 skb_shinfo(skb)->frags[0].page_offset += grow;
3476 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3478 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3479 skb_frag_unref(skb, 0);
3480 memmove(skb_shinfo(skb)->frags,
3481 skb_shinfo(skb)->frags + 1,
3482 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3493 EXPORT_SYMBOL(dev_gro_receive);
3495 static inline gro_result_t
3496 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3499 unsigned int maclen = skb->dev->hard_header_len;
3501 for (p = napi->gro_list; p; p = p->next) {
3502 unsigned long diffs;
3504 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3505 diffs |= p->vlan_tci ^ skb->vlan_tci;
3506 if (maclen == ETH_HLEN)
3507 diffs |= compare_ether_header(skb_mac_header(p),
3508 skb_gro_mac_header(skb));
3510 diffs = memcmp(skb_mac_header(p),
3511 skb_gro_mac_header(skb),
3513 NAPI_GRO_CB(p)->same_flow = !diffs;
3514 NAPI_GRO_CB(p)->flush = 0;
3517 return dev_gro_receive(napi, skb);
3520 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3524 if (netif_receive_skb(skb))
3532 case GRO_MERGED_FREE:
3533 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
3534 kmem_cache_free(skbuff_head_cache, skb);
3546 EXPORT_SYMBOL(napi_skb_finish);
3548 void skb_gro_reset_offset(struct sk_buff *skb)
3550 NAPI_GRO_CB(skb)->data_offset = 0;
3551 NAPI_GRO_CB(skb)->frag0 = NULL;
3552 NAPI_GRO_CB(skb)->frag0_len = 0;
3554 if (skb->mac_header == skb->tail &&
3555 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3556 NAPI_GRO_CB(skb)->frag0 =
3557 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3558 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3561 EXPORT_SYMBOL(skb_gro_reset_offset);
3563 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3565 skb_gro_reset_offset(skb);
3567 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3569 EXPORT_SYMBOL(napi_gro_receive);
3571 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3573 __skb_pull(skb, skb_headlen(skb));
3574 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3575 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3577 skb->dev = napi->dev;
3583 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3585 struct sk_buff *skb = napi->skb;
3588 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3594 EXPORT_SYMBOL(napi_get_frags);
3596 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3602 skb->protocol = eth_type_trans(skb, skb->dev);
3604 if (ret == GRO_HELD)
3605 skb_gro_pull(skb, -ETH_HLEN);
3606 else if (netif_receive_skb(skb))
3611 case GRO_MERGED_FREE:
3612 napi_reuse_skb(napi, skb);
3621 EXPORT_SYMBOL(napi_frags_finish);
3623 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3625 struct sk_buff *skb = napi->skb;
3632 skb_reset_mac_header(skb);
3633 skb_gro_reset_offset(skb);
3635 off = skb_gro_offset(skb);
3636 hlen = off + sizeof(*eth);
3637 eth = skb_gro_header_fast(skb, off);
3638 if (skb_gro_header_hard(skb, hlen)) {
3639 eth = skb_gro_header_slow(skb, hlen, off);
3640 if (unlikely(!eth)) {
3641 napi_reuse_skb(napi, skb);
3647 skb_gro_pull(skb, sizeof(*eth));
3650 * This works because the only protocols we care about don't require
3651 * special handling. We'll fix it up properly at the end.
3653 skb->protocol = eth->h_proto;
3659 gro_result_t napi_gro_frags(struct napi_struct *napi)
3661 struct sk_buff *skb = napi_frags_skb(napi);
3666 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3668 EXPORT_SYMBOL(napi_gro_frags);
3671 * net_rps_action sends any pending IPI's for rps.
3672 * Note: called with local irq disabled, but exits with local irq enabled.
3674 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3677 struct softnet_data *remsd = sd->rps_ipi_list;
3680 sd->rps_ipi_list = NULL;
3684 /* Send pending IPI's to kick RPS processing on remote cpus. */
3686 struct softnet_data *next = remsd->rps_ipi_next;
3688 if (cpu_online(remsd->cpu))
3689 __smp_call_function_single(remsd->cpu,
3698 static int process_backlog(struct napi_struct *napi, int quota)
3701 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3704 /* Check if we have pending ipi, its better to send them now,
3705 * not waiting net_rx_action() end.
3707 if (sd->rps_ipi_list) {
3708 local_irq_disable();
3709 net_rps_action_and_irq_enable(sd);
3712 napi->weight = weight_p;
3713 local_irq_disable();
3714 while (work < quota) {
3715 struct sk_buff *skb;
3718 while ((skb = __skb_dequeue(&sd->process_queue))) {
3720 __netif_receive_skb(skb);
3721 local_irq_disable();
3722 input_queue_head_incr(sd);
3723 if (++work >= quota) {
3730 qlen = skb_queue_len(&sd->input_pkt_queue);
3732 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3733 &sd->process_queue);
3735 if (qlen < quota - work) {
3737 * Inline a custom version of __napi_complete().
3738 * only current cpu owns and manipulates this napi,
3739 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3740 * we can use a plain write instead of clear_bit(),
3741 * and we dont need an smp_mb() memory barrier.
3743 list_del(&napi->poll_list);
3746 quota = work + qlen;
3756 * __napi_schedule - schedule for receive
3757 * @n: entry to schedule
3759 * The entry's receive function will be scheduled to run
3761 void __napi_schedule(struct napi_struct *n)
3763 unsigned long flags;
3765 local_irq_save(flags);
3766 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3767 local_irq_restore(flags);
3769 EXPORT_SYMBOL(__napi_schedule);
3771 void __napi_complete(struct napi_struct *n)
3773 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3774 BUG_ON(n->gro_list);
3776 list_del(&n->poll_list);
3777 smp_mb__before_clear_bit();
3778 clear_bit(NAPI_STATE_SCHED, &n->state);
3780 EXPORT_SYMBOL(__napi_complete);
3782 void napi_complete(struct napi_struct *n)
3784 unsigned long flags;
3787 * don't let napi dequeue from the cpu poll list
3788 * just in case its running on a different cpu
3790 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3794 local_irq_save(flags);
3796 local_irq_restore(flags);
3798 EXPORT_SYMBOL(napi_complete);
3800 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3801 int (*poll)(struct napi_struct *, int), int weight)
3803 INIT_LIST_HEAD(&napi->poll_list);
3804 napi->gro_count = 0;
3805 napi->gro_list = NULL;
3808 napi->weight = weight;
3809 list_add(&napi->dev_list, &dev->napi_list);
3811 #ifdef CONFIG_NETPOLL
3812 spin_lock_init(&napi->poll_lock);
3813 napi->poll_owner = -1;
3815 set_bit(NAPI_STATE_SCHED, &napi->state);
3817 EXPORT_SYMBOL(netif_napi_add);
3819 void netif_napi_del(struct napi_struct *napi)
3821 struct sk_buff *skb, *next;
3823 list_del_init(&napi->dev_list);
3824 napi_free_frags(napi);
3826 for (skb = napi->gro_list; skb; skb = next) {
3832 napi->gro_list = NULL;
3833 napi->gro_count = 0;
3835 EXPORT_SYMBOL(netif_napi_del);
3837 static void net_rx_action(struct softirq_action *h)
3839 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3840 unsigned long time_limit = jiffies + 2;
3841 int budget = netdev_budget;
3844 local_irq_disable();
3846 while (!list_empty(&sd->poll_list)) {
3847 struct napi_struct *n;
3850 /* If softirq window is exhuasted then punt.
3851 * Allow this to run for 2 jiffies since which will allow
3852 * an average latency of 1.5/HZ.
3854 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3859 /* Even though interrupts have been re-enabled, this
3860 * access is safe because interrupts can only add new
3861 * entries to the tail of this list, and only ->poll()
3862 * calls can remove this head entry from the list.
3864 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3866 have = netpoll_poll_lock(n);
3870 /* This NAPI_STATE_SCHED test is for avoiding a race
3871 * with netpoll's poll_napi(). Only the entity which
3872 * obtains the lock and sees NAPI_STATE_SCHED set will
3873 * actually make the ->poll() call. Therefore we avoid
3874 * accidentally calling ->poll() when NAPI is not scheduled.
3877 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3878 work = n->poll(n, weight);
3882 WARN_ON_ONCE(work > weight);
3886 local_irq_disable();
3888 /* Drivers must not modify the NAPI state if they
3889 * consume the entire weight. In such cases this code
3890 * still "owns" the NAPI instance and therefore can
3891 * move the instance around on the list at-will.
3893 if (unlikely(work == weight)) {
3894 if (unlikely(napi_disable_pending(n))) {
3897 local_irq_disable();
3899 list_move_tail(&n->poll_list, &sd->poll_list);
3902 netpoll_poll_unlock(have);
3905 net_rps_action_and_irq_enable(sd);
3907 #ifdef CONFIG_NET_DMA
3909 * There may not be any more sk_buffs coming right now, so push
3910 * any pending DMA copies to hardware
3912 dma_issue_pending_all();
3919 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3923 static gifconf_func_t *gifconf_list[NPROTO];
3926 * register_gifconf - register a SIOCGIF handler
3927 * @family: Address family
3928 * @gifconf: Function handler
3930 * Register protocol dependent address dumping routines. The handler
3931 * that is passed must not be freed or reused until it has been replaced
3932 * by another handler.
3934 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3936 if (family >= NPROTO)
3938 gifconf_list[family] = gifconf;
3941 EXPORT_SYMBOL(register_gifconf);
3945 * Map an interface index to its name (SIOCGIFNAME)
3949 * We need this ioctl for efficient implementation of the
3950 * if_indextoname() function required by the IPv6 API. Without
3951 * it, we would have to search all the interfaces to find a
3955 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3957 struct net_device *dev;
3961 * Fetch the caller's info block.
3964 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3968 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3974 strcpy(ifr.ifr_name, dev->name);
3977 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3983 * Perform a SIOCGIFCONF call. This structure will change
3984 * size eventually, and there is nothing I can do about it.
3985 * Thus we will need a 'compatibility mode'.
3988 static int dev_ifconf(struct net *net, char __user *arg)
3991 struct net_device *dev;
3998 * Fetch the caller's info block.
4001 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4008 * Loop over the interfaces, and write an info block for each.
4012 for_each_netdev(net, dev) {
4013 for (i = 0; i < NPROTO; i++) {
4014 if (gifconf_list[i]) {
4017 done = gifconf_list[i](dev, NULL, 0);
4019 done = gifconf_list[i](dev, pos + total,
4029 * All done. Write the updated control block back to the caller.
4031 ifc.ifc_len = total;
4034 * Both BSD and Solaris return 0 here, so we do too.
4036 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4039 #ifdef CONFIG_PROC_FS
4041 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4043 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4044 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4045 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4047 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4049 struct net *net = seq_file_net(seq);
4050 struct net_device *dev;
4051 struct hlist_node *p;
4052 struct hlist_head *h;
4053 unsigned int count = 0, offset = get_offset(*pos);
4055 h = &net->dev_name_head[get_bucket(*pos)];
4056 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4057 if (++count == offset)
4064 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4066 struct net_device *dev;
4067 unsigned int bucket;
4070 dev = dev_from_same_bucket(seq, pos);
4074 bucket = get_bucket(*pos) + 1;
4075 *pos = set_bucket_offset(bucket, 1);
4076 } while (bucket < NETDEV_HASHENTRIES);
4082 * This is invoked by the /proc filesystem handler to display a device
4085 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4090 return SEQ_START_TOKEN;
4092 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4095 return dev_from_bucket(seq, pos);
4098 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4101 return dev_from_bucket(seq, pos);
4104 void dev_seq_stop(struct seq_file *seq, void *v)
4110 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4112 struct rtnl_link_stats64 temp;
4113 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4115 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4116 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4117 dev->name, stats->rx_bytes, stats->rx_packets,
4119 stats->rx_dropped + stats->rx_missed_errors,
4120 stats->rx_fifo_errors,
4121 stats->rx_length_errors + stats->rx_over_errors +
4122 stats->rx_crc_errors + stats->rx_frame_errors,
4123 stats->rx_compressed, stats->multicast,
4124 stats->tx_bytes, stats->tx_packets,
4125 stats->tx_errors, stats->tx_dropped,
4126 stats->tx_fifo_errors, stats->collisions,
4127 stats->tx_carrier_errors +
4128 stats->tx_aborted_errors +
4129 stats->tx_window_errors +
4130 stats->tx_heartbeat_errors,
4131 stats->tx_compressed);
4135 * Called from the PROCfs module. This now uses the new arbitrary sized
4136 * /proc/net interface to create /proc/net/dev
4138 static int dev_seq_show(struct seq_file *seq, void *v)
4140 if (v == SEQ_START_TOKEN)
4141 seq_puts(seq, "Inter-| Receive "
4143 " face |bytes packets errs drop fifo frame "
4144 "compressed multicast|bytes packets errs "
4145 "drop fifo colls carrier compressed\n");
4147 dev_seq_printf_stats(seq, v);
4151 static struct softnet_data *softnet_get_online(loff_t *pos)
4153 struct softnet_data *sd = NULL;
4155 while (*pos < nr_cpu_ids)
4156 if (cpu_online(*pos)) {
4157 sd = &per_cpu(softnet_data, *pos);
4164 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4166 return softnet_get_online(pos);
4169 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4172 return softnet_get_online(pos);
4175 static void softnet_seq_stop(struct seq_file *seq, void *v)
4179 static int softnet_seq_show(struct seq_file *seq, void *v)
4181 struct softnet_data *sd = v;
4183 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4184 sd->processed, sd->dropped, sd->time_squeeze, 0,
4185 0, 0, 0, 0, /* was fastroute */
4186 sd->cpu_collision, sd->received_rps);
4190 static const struct seq_operations dev_seq_ops = {
4191 .start = dev_seq_start,
4192 .next = dev_seq_next,
4193 .stop = dev_seq_stop,
4194 .show = dev_seq_show,
4197 static int dev_seq_open(struct inode *inode, struct file *file)
4199 return seq_open_net(inode, file, &dev_seq_ops,
4200 sizeof(struct seq_net_private));
4203 static const struct file_operations dev_seq_fops = {
4204 .owner = THIS_MODULE,
4205 .open = dev_seq_open,
4207 .llseek = seq_lseek,
4208 .release = seq_release_net,
4211 static const struct seq_operations softnet_seq_ops = {
4212 .start = softnet_seq_start,
4213 .next = softnet_seq_next,
4214 .stop = softnet_seq_stop,
4215 .show = softnet_seq_show,
4218 static int softnet_seq_open(struct inode *inode, struct file *file)
4220 return seq_open(file, &softnet_seq_ops);
4223 static const struct file_operations softnet_seq_fops = {
4224 .owner = THIS_MODULE,
4225 .open = softnet_seq_open,
4227 .llseek = seq_lseek,
4228 .release = seq_release,
4231 static void *ptype_get_idx(loff_t pos)
4233 struct packet_type *pt = NULL;
4237 list_for_each_entry_rcu(pt, &ptype_all, list) {
4243 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4244 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4253 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4257 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4260 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4262 struct packet_type *pt;
4263 struct list_head *nxt;
4267 if (v == SEQ_START_TOKEN)
4268 return ptype_get_idx(0);
4271 nxt = pt->list.next;
4272 if (pt->type == htons(ETH_P_ALL)) {
4273 if (nxt != &ptype_all)
4276 nxt = ptype_base[0].next;
4278 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4280 while (nxt == &ptype_base[hash]) {
4281 if (++hash >= PTYPE_HASH_SIZE)
4283 nxt = ptype_base[hash].next;
4286 return list_entry(nxt, struct packet_type, list);
4289 static void ptype_seq_stop(struct seq_file *seq, void *v)
4295 static int ptype_seq_show(struct seq_file *seq, void *v)
4297 struct packet_type *pt = v;
4299 if (v == SEQ_START_TOKEN)
4300 seq_puts(seq, "Type Device Function\n");
4301 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4302 if (pt->type == htons(ETH_P_ALL))
4303 seq_puts(seq, "ALL ");
4305 seq_printf(seq, "%04x", ntohs(pt->type));
4307 seq_printf(seq, " %-8s %pF\n",
4308 pt->dev ? pt->dev->name : "", pt->func);
4314 static const struct seq_operations ptype_seq_ops = {
4315 .start = ptype_seq_start,
4316 .next = ptype_seq_next,
4317 .stop = ptype_seq_stop,
4318 .show = ptype_seq_show,
4321 static int ptype_seq_open(struct inode *inode, struct file *file)
4323 return seq_open_net(inode, file, &ptype_seq_ops,
4324 sizeof(struct seq_net_private));
4327 static const struct file_operations ptype_seq_fops = {
4328 .owner = THIS_MODULE,
4329 .open = ptype_seq_open,
4331 .llseek = seq_lseek,
4332 .release = seq_release_net,
4336 static int __net_init dev_proc_net_init(struct net *net)
4340 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4342 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4344 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4347 if (wext_proc_init(net))
4353 proc_net_remove(net, "ptype");
4355 proc_net_remove(net, "softnet_stat");
4357 proc_net_remove(net, "dev");
4361 static void __net_exit dev_proc_net_exit(struct net *net)
4363 wext_proc_exit(net);
4365 proc_net_remove(net, "ptype");
4366 proc_net_remove(net, "softnet_stat");
4367 proc_net_remove(net, "dev");
4370 static struct pernet_operations __net_initdata dev_proc_ops = {
4371 .init = dev_proc_net_init,
4372 .exit = dev_proc_net_exit,
4375 static int __init dev_proc_init(void)
4377 return register_pernet_subsys(&dev_proc_ops);
4380 #define dev_proc_init() 0
4381 #endif /* CONFIG_PROC_FS */
4385 * netdev_set_master - set up master pointer
4386 * @slave: slave device
4387 * @master: new master device
4389 * Changes the master device of the slave. Pass %NULL to break the
4390 * bonding. The caller must hold the RTNL semaphore. On a failure
4391 * a negative errno code is returned. On success the reference counts
4392 * are adjusted and the function returns zero.
4394 int netdev_set_master(struct net_device *slave, struct net_device *master)
4396 struct net_device *old = slave->master;
4406 slave->master = master;
4412 EXPORT_SYMBOL(netdev_set_master);
4415 * netdev_set_bond_master - set up bonding master/slave pair
4416 * @slave: slave device
4417 * @master: new master device
4419 * Changes the master device of the slave. Pass %NULL to break the
4420 * bonding. The caller must hold the RTNL semaphore. On a failure
4421 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4422 * to the routing socket and the function returns zero.
4424 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4430 err = netdev_set_master(slave, master);
4434 slave->flags |= IFF_SLAVE;
4436 slave->flags &= ~IFF_SLAVE;
4438 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4441 EXPORT_SYMBOL(netdev_set_bond_master);
4443 static void dev_change_rx_flags(struct net_device *dev, int flags)
4445 const struct net_device_ops *ops = dev->netdev_ops;
4447 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4448 ops->ndo_change_rx_flags(dev, flags);
4451 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4453 unsigned int old_flags = dev->flags;
4459 dev->flags |= IFF_PROMISC;
4460 dev->promiscuity += inc;
4461 if (dev->promiscuity == 0) {
4464 * If inc causes overflow, untouch promisc and return error.
4467 dev->flags &= ~IFF_PROMISC;
4469 dev->promiscuity -= inc;
4470 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4475 if (dev->flags != old_flags) {
4476 pr_info("device %s %s promiscuous mode\n",
4478 dev->flags & IFF_PROMISC ? "entered" : "left");
4479 if (audit_enabled) {
4480 current_uid_gid(&uid, &gid);
4481 audit_log(current->audit_context, GFP_ATOMIC,
4482 AUDIT_ANOM_PROMISCUOUS,
4483 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4484 dev->name, (dev->flags & IFF_PROMISC),
4485 (old_flags & IFF_PROMISC),
4486 audit_get_loginuid(current),
4488 audit_get_sessionid(current));
4491 dev_change_rx_flags(dev, IFF_PROMISC);
4497 * dev_set_promiscuity - update promiscuity count on a device
4501 * Add or remove promiscuity from a device. While the count in the device
4502 * remains above zero the interface remains promiscuous. Once it hits zero
4503 * the device reverts back to normal filtering operation. A negative inc
4504 * value is used to drop promiscuity on the device.
4505 * Return 0 if successful or a negative errno code on error.
4507 int dev_set_promiscuity(struct net_device *dev, int inc)
4509 unsigned int old_flags = dev->flags;
4512 err = __dev_set_promiscuity(dev, inc);
4515 if (dev->flags != old_flags)
4516 dev_set_rx_mode(dev);
4519 EXPORT_SYMBOL(dev_set_promiscuity);
4522 * dev_set_allmulti - update allmulti count on a device
4526 * Add or remove reception of all multicast frames to a device. While the
4527 * count in the device remains above zero the interface remains listening
4528 * to all interfaces. Once it hits zero the device reverts back to normal
4529 * filtering operation. A negative @inc value is used to drop the counter
4530 * when releasing a resource needing all multicasts.
4531 * Return 0 if successful or a negative errno code on error.
4534 int dev_set_allmulti(struct net_device *dev, int inc)
4536 unsigned int old_flags = dev->flags;
4540 dev->flags |= IFF_ALLMULTI;
4541 dev->allmulti += inc;
4542 if (dev->allmulti == 0) {
4545 * If inc causes overflow, untouch allmulti and return error.
4548 dev->flags &= ~IFF_ALLMULTI;
4550 dev->allmulti -= inc;
4551 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4556 if (dev->flags ^ old_flags) {
4557 dev_change_rx_flags(dev, IFF_ALLMULTI);
4558 dev_set_rx_mode(dev);
4562 EXPORT_SYMBOL(dev_set_allmulti);
4565 * Upload unicast and multicast address lists to device and
4566 * configure RX filtering. When the device doesn't support unicast
4567 * filtering it is put in promiscuous mode while unicast addresses
4570 void __dev_set_rx_mode(struct net_device *dev)
4572 const struct net_device_ops *ops = dev->netdev_ops;
4574 /* dev_open will call this function so the list will stay sane. */
4575 if (!(dev->flags&IFF_UP))
4578 if (!netif_device_present(dev))
4581 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4582 /* Unicast addresses changes may only happen under the rtnl,
4583 * therefore calling __dev_set_promiscuity here is safe.
4585 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4586 __dev_set_promiscuity(dev, 1);
4587 dev->uc_promisc = true;
4588 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4589 __dev_set_promiscuity(dev, -1);
4590 dev->uc_promisc = false;
4594 if (ops->ndo_set_rx_mode)
4595 ops->ndo_set_rx_mode(dev);
4598 void dev_set_rx_mode(struct net_device *dev)
4600 netif_addr_lock_bh(dev);
4601 __dev_set_rx_mode(dev);
4602 netif_addr_unlock_bh(dev);
4606 * dev_get_flags - get flags reported to userspace
4609 * Get the combination of flag bits exported through APIs to userspace.
4611 unsigned int dev_get_flags(const struct net_device *dev)
4615 flags = (dev->flags & ~(IFF_PROMISC |
4620 (dev->gflags & (IFF_PROMISC |
4623 if (netif_running(dev)) {
4624 if (netif_oper_up(dev))
4625 flags |= IFF_RUNNING;
4626 if (netif_carrier_ok(dev))
4627 flags |= IFF_LOWER_UP;
4628 if (netif_dormant(dev))
4629 flags |= IFF_DORMANT;
4634 EXPORT_SYMBOL(dev_get_flags);
4636 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4638 unsigned int old_flags = dev->flags;
4644 * Set the flags on our device.
4647 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4648 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4650 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4654 * Load in the correct multicast list now the flags have changed.
4657 if ((old_flags ^ flags) & IFF_MULTICAST)
4658 dev_change_rx_flags(dev, IFF_MULTICAST);
4660 dev_set_rx_mode(dev);
4663 * Have we downed the interface. We handle IFF_UP ourselves
4664 * according to user attempts to set it, rather than blindly
4669 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4670 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4673 dev_set_rx_mode(dev);
4676 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4677 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4679 dev->gflags ^= IFF_PROMISC;
4680 dev_set_promiscuity(dev, inc);
4683 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4684 is important. Some (broken) drivers set IFF_PROMISC, when
4685 IFF_ALLMULTI is requested not asking us and not reporting.
4687 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4688 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4690 dev->gflags ^= IFF_ALLMULTI;
4691 dev_set_allmulti(dev, inc);
4697 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4699 unsigned int changes = dev->flags ^ old_flags;
4701 if (changes & IFF_UP) {
4702 if (dev->flags & IFF_UP)
4703 call_netdevice_notifiers(NETDEV_UP, dev);
4705 call_netdevice_notifiers(NETDEV_DOWN, dev);
4708 if (dev->flags & IFF_UP &&
4709 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4710 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4714 * dev_change_flags - change device settings
4716 * @flags: device state flags
4718 * Change settings on device based state flags. The flags are
4719 * in the userspace exported format.
4721 int dev_change_flags(struct net_device *dev, unsigned int flags)
4724 unsigned int changes, old_flags = dev->flags;
4726 ret = __dev_change_flags(dev, flags);
4730 changes = old_flags ^ dev->flags;
4732 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4734 __dev_notify_flags(dev, old_flags);
4737 EXPORT_SYMBOL(dev_change_flags);
4740 * dev_set_mtu - Change maximum transfer unit
4742 * @new_mtu: new transfer unit
4744 * Change the maximum transfer size of the network device.
4746 int dev_set_mtu(struct net_device *dev, int new_mtu)
4748 const struct net_device_ops *ops = dev->netdev_ops;
4751 if (new_mtu == dev->mtu)
4754 /* MTU must be positive. */
4758 if (!netif_device_present(dev))
4762 if (ops->ndo_change_mtu)
4763 err = ops->ndo_change_mtu(dev, new_mtu);
4767 if (!err && dev->flags & IFF_UP)
4768 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4771 EXPORT_SYMBOL(dev_set_mtu);
4774 * dev_set_group - Change group this device belongs to
4776 * @new_group: group this device should belong to
4778 void dev_set_group(struct net_device *dev, int new_group)
4780 dev->group = new_group;
4782 EXPORT_SYMBOL(dev_set_group);
4785 * dev_set_mac_address - Change Media Access Control Address
4789 * Change the hardware (MAC) address of the device
4791 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4793 const struct net_device_ops *ops = dev->netdev_ops;
4796 if (!ops->ndo_set_mac_address)
4798 if (sa->sa_family != dev->type)
4800 if (!netif_device_present(dev))
4802 err = ops->ndo_set_mac_address(dev, sa);
4804 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4805 add_device_randomness(dev->dev_addr, dev->addr_len);
4808 EXPORT_SYMBOL(dev_set_mac_address);
4811 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4813 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4816 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4822 case SIOCGIFFLAGS: /* Get interface flags */
4823 ifr->ifr_flags = (short) dev_get_flags(dev);
4826 case SIOCGIFMETRIC: /* Get the metric on the interface
4827 (currently unused) */
4828 ifr->ifr_metric = 0;
4831 case SIOCGIFMTU: /* Get the MTU of a device */
4832 ifr->ifr_mtu = dev->mtu;
4837 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4839 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4840 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4841 ifr->ifr_hwaddr.sa_family = dev->type;
4849 ifr->ifr_map.mem_start = dev->mem_start;
4850 ifr->ifr_map.mem_end = dev->mem_end;
4851 ifr->ifr_map.base_addr = dev->base_addr;
4852 ifr->ifr_map.irq = dev->irq;
4853 ifr->ifr_map.dma = dev->dma;
4854 ifr->ifr_map.port = dev->if_port;
4858 ifr->ifr_ifindex = dev->ifindex;
4862 ifr->ifr_qlen = dev->tx_queue_len;
4866 /* dev_ioctl() should ensure this case
4878 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4880 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4883 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4884 const struct net_device_ops *ops;
4889 ops = dev->netdev_ops;
4892 case SIOCSIFFLAGS: /* Set interface flags */
4893 return dev_change_flags(dev, ifr->ifr_flags);
4895 case SIOCSIFMETRIC: /* Set the metric on the interface
4896 (currently unused) */
4899 case SIOCSIFMTU: /* Set the MTU of a device */
4900 return dev_set_mtu(dev, ifr->ifr_mtu);
4903 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4905 case SIOCSIFHWBROADCAST:
4906 if (ifr->ifr_hwaddr.sa_family != dev->type)
4908 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4909 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4910 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4914 if (ops->ndo_set_config) {
4915 if (!netif_device_present(dev))
4917 return ops->ndo_set_config(dev, &ifr->ifr_map);
4922 if (!ops->ndo_set_rx_mode ||
4923 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4925 if (!netif_device_present(dev))
4927 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4930 if (!ops->ndo_set_rx_mode ||
4931 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4933 if (!netif_device_present(dev))
4935 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4938 if (ifr->ifr_qlen < 0)
4940 dev->tx_queue_len = ifr->ifr_qlen;
4944 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4945 return dev_change_name(dev, ifr->ifr_newname);
4948 err = net_hwtstamp_validate(ifr);
4954 * Unknown or private ioctl
4957 if ((cmd >= SIOCDEVPRIVATE &&
4958 cmd <= SIOCDEVPRIVATE + 15) ||
4959 cmd == SIOCBONDENSLAVE ||
4960 cmd == SIOCBONDRELEASE ||
4961 cmd == SIOCBONDSETHWADDR ||
4962 cmd == SIOCBONDSLAVEINFOQUERY ||
4963 cmd == SIOCBONDINFOQUERY ||
4964 cmd == SIOCBONDCHANGEACTIVE ||
4965 cmd == SIOCGMIIPHY ||
4966 cmd == SIOCGMIIREG ||
4967 cmd == SIOCSMIIREG ||
4968 cmd == SIOCBRADDIF ||
4969 cmd == SIOCBRDELIF ||
4970 cmd == SIOCSHWTSTAMP ||
4971 cmd == SIOCWANDEV) {
4973 if (ops->ndo_do_ioctl) {
4974 if (netif_device_present(dev))
4975 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4987 * This function handles all "interface"-type I/O control requests. The actual
4988 * 'doing' part of this is dev_ifsioc above.
4992 * dev_ioctl - network device ioctl
4993 * @net: the applicable net namespace
4994 * @cmd: command to issue
4995 * @arg: pointer to a struct ifreq in user space
4997 * Issue ioctl functions to devices. This is normally called by the
4998 * user space syscall interfaces but can sometimes be useful for
4999 * other purposes. The return value is the return from the syscall if
5000 * positive or a negative errno code on error.
5003 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5009 /* One special case: SIOCGIFCONF takes ifconf argument
5010 and requires shared lock, because it sleeps writing
5014 if (cmd == SIOCGIFCONF) {
5016 ret = dev_ifconf(net, (char __user *) arg);
5020 if (cmd == SIOCGIFNAME)
5021 return dev_ifname(net, (struct ifreq __user *)arg);
5023 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5026 ifr.ifr_name[IFNAMSIZ-1] = 0;
5028 colon = strchr(ifr.ifr_name, ':');
5033 * See which interface the caller is talking about.
5038 * These ioctl calls:
5039 * - can be done by all.
5040 * - atomic and do not require locking.
5051 dev_load(net, ifr.ifr_name);
5053 ret = dev_ifsioc_locked(net, &ifr, cmd);
5058 if (copy_to_user(arg, &ifr,
5059 sizeof(struct ifreq)))
5065 dev_load(net, ifr.ifr_name);
5067 ret = dev_ethtool(net, &ifr);
5072 if (copy_to_user(arg, &ifr,
5073 sizeof(struct ifreq)))
5079 * These ioctl calls:
5080 * - require superuser power.
5081 * - require strict serialization.
5087 if (!capable(CAP_NET_ADMIN))
5089 dev_load(net, ifr.ifr_name);
5091 ret = dev_ifsioc(net, &ifr, cmd);
5096 if (copy_to_user(arg, &ifr,
5097 sizeof(struct ifreq)))
5103 * These ioctl calls:
5104 * - require superuser power.
5105 * - require strict serialization.
5106 * - do not return a value
5116 case SIOCSIFHWBROADCAST:
5119 case SIOCBONDENSLAVE:
5120 case SIOCBONDRELEASE:
5121 case SIOCBONDSETHWADDR:
5122 case SIOCBONDCHANGEACTIVE:
5126 if (!capable(CAP_NET_ADMIN))
5129 case SIOCBONDSLAVEINFOQUERY:
5130 case SIOCBONDINFOQUERY:
5131 dev_load(net, ifr.ifr_name);
5133 ret = dev_ifsioc(net, &ifr, cmd);
5138 /* Get the per device memory space. We can add this but
5139 * currently do not support it */
5141 /* Set the per device memory buffer space.
5142 * Not applicable in our case */
5147 * Unknown or private ioctl.
5150 if (cmd == SIOCWANDEV ||
5151 (cmd >= SIOCDEVPRIVATE &&
5152 cmd <= SIOCDEVPRIVATE + 15)) {
5153 dev_load(net, ifr.ifr_name);
5155 ret = dev_ifsioc(net, &ifr, cmd);
5157 if (!ret && copy_to_user(arg, &ifr,
5158 sizeof(struct ifreq)))
5162 /* Take care of Wireless Extensions */
5163 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5164 return wext_handle_ioctl(net, &ifr, cmd, arg);
5171 * dev_new_index - allocate an ifindex
5172 * @net: the applicable net namespace
5174 * Returns a suitable unique value for a new device interface
5175 * number. The caller must hold the rtnl semaphore or the
5176 * dev_base_lock to be sure it remains unique.
5178 static int dev_new_index(struct net *net)
5184 if (!__dev_get_by_index(net, ifindex))
5189 /* Delayed registration/unregisteration */
5190 static LIST_HEAD(net_todo_list);
5192 static void net_set_todo(struct net_device *dev)
5194 list_add_tail(&dev->todo_list, &net_todo_list);
5197 static void rollback_registered_many(struct list_head *head)
5199 struct net_device *dev, *tmp;
5201 BUG_ON(dev_boot_phase);
5204 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5205 /* Some devices call without registering
5206 * for initialization unwind. Remove those
5207 * devices and proceed with the remaining.
5209 if (dev->reg_state == NETREG_UNINITIALIZED) {
5210 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5214 list_del(&dev->unreg_list);
5217 dev->dismantle = true;
5218 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5221 /* If device is running, close it first. */
5222 dev_close_many(head);
5224 list_for_each_entry(dev, head, unreg_list) {
5225 /* And unlink it from device chain. */
5226 unlist_netdevice(dev);
5228 dev->reg_state = NETREG_UNREGISTERING;
5233 list_for_each_entry(dev, head, unreg_list) {
5234 /* Shutdown queueing discipline. */
5238 /* Notify protocols, that we are about to destroy
5239 this device. They should clean all the things.
5241 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5243 if (!dev->rtnl_link_ops ||
5244 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5245 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5248 * Flush the unicast and multicast chains
5253 if (dev->netdev_ops->ndo_uninit)
5254 dev->netdev_ops->ndo_uninit(dev);
5256 /* Notifier chain MUST detach us from master device. */
5257 WARN_ON(dev->master);
5259 /* Remove entries from kobject tree */
5260 netdev_unregister_kobject(dev);
5263 /* Process any work delayed until the end of the batch */
5264 dev = list_first_entry(head, struct net_device, unreg_list);
5265 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5269 list_for_each_entry(dev, head, unreg_list)
5273 static void rollback_registered(struct net_device *dev)
5277 list_add(&dev->unreg_list, &single);
5278 rollback_registered_many(&single);
5282 static netdev_features_t netdev_fix_features(struct net_device *dev,
5283 netdev_features_t features)
5285 /* Fix illegal checksum combinations */
5286 if ((features & NETIF_F_HW_CSUM) &&
5287 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5288 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5289 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5292 /* Fix illegal SG+CSUM combinations. */
5293 if ((features & NETIF_F_SG) &&
5294 !(features & NETIF_F_ALL_CSUM)) {
5296 "Dropping NETIF_F_SG since no checksum feature.\n");
5297 features &= ~NETIF_F_SG;
5300 /* TSO requires that SG is present as well. */
5301 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5302 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5303 features &= ~NETIF_F_ALL_TSO;
5306 /* TSO ECN requires that TSO is present as well. */
5307 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5308 features &= ~NETIF_F_TSO_ECN;
5310 /* Software GSO depends on SG. */
5311 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5312 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5313 features &= ~NETIF_F_GSO;
5316 /* UFO needs SG and checksumming */
5317 if (features & NETIF_F_UFO) {
5318 /* maybe split UFO into V4 and V6? */
5319 if (!((features & NETIF_F_GEN_CSUM) ||
5320 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5321 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5323 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5324 features &= ~NETIF_F_UFO;
5327 if (!(features & NETIF_F_SG)) {
5329 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5330 features &= ~NETIF_F_UFO;
5337 int __netdev_update_features(struct net_device *dev)
5339 netdev_features_t features;
5344 features = netdev_get_wanted_features(dev);
5346 if (dev->netdev_ops->ndo_fix_features)
5347 features = dev->netdev_ops->ndo_fix_features(dev, features);
5349 /* driver might be less strict about feature dependencies */
5350 features = netdev_fix_features(dev, features);
5352 if (dev->features == features)
5355 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
5356 &dev->features, &features);
5358 if (dev->netdev_ops->ndo_set_features)
5359 err = dev->netdev_ops->ndo_set_features(dev, features);
5361 if (unlikely(err < 0)) {
5363 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5364 err, &features, &dev->features);
5369 dev->features = features;
5375 * netdev_update_features - recalculate device features
5376 * @dev: the device to check
5378 * Recalculate dev->features set and send notifications if it
5379 * has changed. Should be called after driver or hardware dependent
5380 * conditions might have changed that influence the features.
5382 void netdev_update_features(struct net_device *dev)
5384 if (__netdev_update_features(dev))
5385 netdev_features_change(dev);
5387 EXPORT_SYMBOL(netdev_update_features);
5390 * netdev_change_features - recalculate device features
5391 * @dev: the device to check
5393 * Recalculate dev->features set and send notifications even
5394 * if they have not changed. Should be called instead of
5395 * netdev_update_features() if also dev->vlan_features might
5396 * have changed to allow the changes to be propagated to stacked
5399 void netdev_change_features(struct net_device *dev)
5401 __netdev_update_features(dev);
5402 netdev_features_change(dev);
5404 EXPORT_SYMBOL(netdev_change_features);
5407 * netif_stacked_transfer_operstate - transfer operstate
5408 * @rootdev: the root or lower level device to transfer state from
5409 * @dev: the device to transfer operstate to
5411 * Transfer operational state from root to device. This is normally
5412 * called when a stacking relationship exists between the root
5413 * device and the device(a leaf device).
5415 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5416 struct net_device *dev)
5418 if (rootdev->operstate == IF_OPER_DORMANT)
5419 netif_dormant_on(dev);
5421 netif_dormant_off(dev);
5423 if (netif_carrier_ok(rootdev)) {
5424 if (!netif_carrier_ok(dev))
5425 netif_carrier_on(dev);
5427 if (netif_carrier_ok(dev))
5428 netif_carrier_off(dev);
5431 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5434 static int netif_alloc_rx_queues(struct net_device *dev)
5436 unsigned int i, count = dev->num_rx_queues;
5437 struct netdev_rx_queue *rx;
5441 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5443 pr_err("netdev: Unable to allocate %u rx queues\n", count);
5448 for (i = 0; i < count; i++)
5454 static void netdev_init_one_queue(struct net_device *dev,
5455 struct netdev_queue *queue, void *_unused)
5457 /* Initialize queue lock */
5458 spin_lock_init(&queue->_xmit_lock);
5459 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5460 queue->xmit_lock_owner = -1;
5461 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5464 dql_init(&queue->dql, HZ);
5468 static int netif_alloc_netdev_queues(struct net_device *dev)
5470 unsigned int count = dev->num_tx_queues;
5471 struct netdev_queue *tx;
5475 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5477 pr_err("netdev: Unable to allocate %u tx queues\n", count);
5482 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5483 spin_lock_init(&dev->tx_global_lock);
5489 * register_netdevice - register a network device
5490 * @dev: device to register
5492 * Take a completed network device structure and add it to the kernel
5493 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5494 * chain. 0 is returned on success. A negative errno code is returned
5495 * on a failure to set up the device, or if the name is a duplicate.
5497 * Callers must hold the rtnl semaphore. You may want
5498 * register_netdev() instead of this.
5501 * The locking appears insufficient to guarantee two parallel registers
5502 * will not get the same name.
5505 int register_netdevice(struct net_device *dev)
5508 struct net *net = dev_net(dev);
5510 BUG_ON(dev_boot_phase);
5515 /* When net_device's are persistent, this will be fatal. */
5516 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5519 spin_lock_init(&dev->addr_list_lock);
5520 netdev_set_addr_lockdep_class(dev);
5524 ret = dev_get_valid_name(dev, dev->name);
5528 /* Init, if this function is available */
5529 if (dev->netdev_ops->ndo_init) {
5530 ret = dev->netdev_ops->ndo_init(dev);
5538 dev->ifindex = dev_new_index(net);
5539 if (dev->iflink == -1)
5540 dev->iflink = dev->ifindex;
5542 /* Transfer changeable features to wanted_features and enable
5543 * software offloads (GSO and GRO).
5545 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5546 dev->features |= NETIF_F_SOFT_FEATURES;
5547 dev->wanted_features = dev->features & dev->hw_features;
5549 /* Turn on no cache copy if HW is doing checksum */
5550 if (!(dev->flags & IFF_LOOPBACK)) {
5551 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5552 if (dev->features & NETIF_F_ALL_CSUM) {
5553 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5554 dev->features |= NETIF_F_NOCACHE_COPY;
5558 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5560 dev->vlan_features |= NETIF_F_HIGHDMA;
5562 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5563 ret = notifier_to_errno(ret);
5567 ret = netdev_register_kobject(dev);
5570 dev->reg_state = NETREG_REGISTERED;
5572 __netdev_update_features(dev);
5575 * Default initial state at registry is that the
5576 * device is present.
5579 set_bit(__LINK_STATE_PRESENT, &dev->state);
5581 dev_init_scheduler(dev);
5583 list_netdevice(dev);
5584 add_device_randomness(dev->dev_addr, dev->addr_len);
5586 /* Notify protocols, that a new device appeared. */
5587 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5588 ret = notifier_to_errno(ret);
5590 rollback_registered(dev);
5591 dev->reg_state = NETREG_UNREGISTERED;
5594 * Prevent userspace races by waiting until the network
5595 * device is fully setup before sending notifications.
5597 if (!dev->rtnl_link_ops ||
5598 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5599 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5605 if (dev->netdev_ops->ndo_uninit)
5606 dev->netdev_ops->ndo_uninit(dev);
5609 EXPORT_SYMBOL(register_netdevice);
5612 * init_dummy_netdev - init a dummy network device for NAPI
5613 * @dev: device to init
5615 * This takes a network device structure and initialize the minimum
5616 * amount of fields so it can be used to schedule NAPI polls without
5617 * registering a full blown interface. This is to be used by drivers
5618 * that need to tie several hardware interfaces to a single NAPI
5619 * poll scheduler due to HW limitations.
5621 int init_dummy_netdev(struct net_device *dev)
5623 /* Clear everything. Note we don't initialize spinlocks
5624 * are they aren't supposed to be taken by any of the
5625 * NAPI code and this dummy netdev is supposed to be
5626 * only ever used for NAPI polls
5628 memset(dev, 0, sizeof(struct net_device));
5630 /* make sure we BUG if trying to hit standard
5631 * register/unregister code path
5633 dev->reg_state = NETREG_DUMMY;
5635 /* NAPI wants this */
5636 INIT_LIST_HEAD(&dev->napi_list);
5638 /* a dummy interface is started by default */
5639 set_bit(__LINK_STATE_PRESENT, &dev->state);
5640 set_bit(__LINK_STATE_START, &dev->state);
5642 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5643 * because users of this 'device' dont need to change
5649 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5653 * register_netdev - register a network device
5654 * @dev: device to register
5656 * Take a completed network device structure and add it to the kernel
5657 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5658 * chain. 0 is returned on success. A negative errno code is returned
5659 * on a failure to set up the device, or if the name is a duplicate.
5661 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5662 * and expands the device name if you passed a format string to
5665 int register_netdev(struct net_device *dev)
5670 err = register_netdevice(dev);
5674 EXPORT_SYMBOL(register_netdev);
5676 int netdev_refcnt_read(const struct net_device *dev)
5680 for_each_possible_cpu(i)
5681 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5684 EXPORT_SYMBOL(netdev_refcnt_read);
5687 * netdev_wait_allrefs - wait until all references are gone.
5689 * This is called when unregistering network devices.
5691 * Any protocol or device that holds a reference should register
5692 * for netdevice notification, and cleanup and put back the
5693 * reference if they receive an UNREGISTER event.
5694 * We can get stuck here if buggy protocols don't correctly
5697 static void netdev_wait_allrefs(struct net_device *dev)
5699 unsigned long rebroadcast_time, warning_time;
5702 linkwatch_forget_dev(dev);
5704 rebroadcast_time = warning_time = jiffies;
5705 refcnt = netdev_refcnt_read(dev);
5707 while (refcnt != 0) {
5708 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5711 /* Rebroadcast unregister notification */
5712 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5713 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5714 * should have already handle it the first time */
5716 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5718 /* We must not have linkwatch events
5719 * pending on unregister. If this
5720 * happens, we simply run the queue
5721 * unscheduled, resulting in a noop
5724 linkwatch_run_queue();
5729 rebroadcast_time = jiffies;
5734 refcnt = netdev_refcnt_read(dev);
5736 if (time_after(jiffies, warning_time + 10 * HZ)) {
5737 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5739 warning_time = jiffies;
5748 * register_netdevice(x1);
5749 * register_netdevice(x2);
5751 * unregister_netdevice(y1);
5752 * unregister_netdevice(y2);
5758 * We are invoked by rtnl_unlock().
5759 * This allows us to deal with problems:
5760 * 1) We can delete sysfs objects which invoke hotplug
5761 * without deadlocking with linkwatch via keventd.
5762 * 2) Since we run with the RTNL semaphore not held, we can sleep
5763 * safely in order to wait for the netdev refcnt to drop to zero.
5765 * We must not return until all unregister events added during
5766 * the interval the lock was held have been completed.
5768 void netdev_run_todo(void)
5770 struct list_head list;
5772 /* Snapshot list, allow later requests */
5773 list_replace_init(&net_todo_list, &list);
5777 /* Wait for rcu callbacks to finish before attempting to drain
5778 * the device list. This usually avoids a 250ms wait.
5780 if (!list_empty(&list))
5783 while (!list_empty(&list)) {
5784 struct net_device *dev
5785 = list_first_entry(&list, struct net_device, todo_list);
5786 list_del(&dev->todo_list);
5788 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5789 pr_err("network todo '%s' but state %d\n",
5790 dev->name, dev->reg_state);
5795 dev->reg_state = NETREG_UNREGISTERED;
5797 on_each_cpu(flush_backlog, dev, 1);
5799 netdev_wait_allrefs(dev);
5802 BUG_ON(netdev_refcnt_read(dev));
5803 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5804 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5805 WARN_ON(dev->dn_ptr);
5807 if (dev->destructor)
5808 dev->destructor(dev);
5810 /* Free network device */
5811 kobject_put(&dev->dev.kobj);
5815 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5816 * fields in the same order, with only the type differing.
5818 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5819 const struct net_device_stats *netdev_stats)
5821 #if BITS_PER_LONG == 64
5822 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5823 memcpy(stats64, netdev_stats, sizeof(*stats64));
5825 size_t i, n = sizeof(*stats64) / sizeof(u64);
5826 const unsigned long *src = (const unsigned long *)netdev_stats;
5827 u64 *dst = (u64 *)stats64;
5829 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5830 sizeof(*stats64) / sizeof(u64));
5831 for (i = 0; i < n; i++)
5835 EXPORT_SYMBOL(netdev_stats_to_stats64);
5838 * dev_get_stats - get network device statistics
5839 * @dev: device to get statistics from
5840 * @storage: place to store stats
5842 * Get network statistics from device. Return @storage.
5843 * The device driver may provide its own method by setting
5844 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5845 * otherwise the internal statistics structure is used.
5847 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5848 struct rtnl_link_stats64 *storage)
5850 const struct net_device_ops *ops = dev->netdev_ops;
5852 if (ops->ndo_get_stats64) {
5853 memset(storage, 0, sizeof(*storage));
5854 ops->ndo_get_stats64(dev, storage);
5855 } else if (ops->ndo_get_stats) {
5856 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5858 netdev_stats_to_stats64(storage, &dev->stats);
5860 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5863 EXPORT_SYMBOL(dev_get_stats);
5865 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5867 struct netdev_queue *queue = dev_ingress_queue(dev);
5869 #ifdef CONFIG_NET_CLS_ACT
5872 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5875 netdev_init_one_queue(dev, queue, NULL);
5876 queue->qdisc = &noop_qdisc;
5877 queue->qdisc_sleeping = &noop_qdisc;
5878 rcu_assign_pointer(dev->ingress_queue, queue);
5884 * alloc_netdev_mqs - allocate network device
5885 * @sizeof_priv: size of private data to allocate space for
5886 * @name: device name format string
5887 * @setup: callback to initialize device
5888 * @txqs: the number of TX subqueues to allocate
5889 * @rxqs: the number of RX subqueues to allocate
5891 * Allocates a struct net_device with private data area for driver use
5892 * and performs basic initialization. Also allocates subquue structs
5893 * for each queue on the device.
5895 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5896 void (*setup)(struct net_device *),
5897 unsigned int txqs, unsigned int rxqs)
5899 struct net_device *dev;
5901 struct net_device *p;
5903 BUG_ON(strlen(name) >= sizeof(dev->name));
5906 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5912 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5917 alloc_size = sizeof(struct net_device);
5919 /* ensure 32-byte alignment of private area */
5920 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5921 alloc_size += sizeof_priv;
5923 /* ensure 32-byte alignment of whole construct */
5924 alloc_size += NETDEV_ALIGN - 1;
5926 p = kzalloc(alloc_size, GFP_KERNEL);
5928 pr_err("alloc_netdev: Unable to allocate device\n");
5932 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5933 dev->padded = (char *)dev - (char *)p;
5935 dev->pcpu_refcnt = alloc_percpu(int);
5936 if (!dev->pcpu_refcnt)
5939 if (dev_addr_init(dev))
5945 dev_net_set(dev, &init_net);
5947 dev->gso_max_size = GSO_MAX_SIZE;
5949 INIT_LIST_HEAD(&dev->napi_list);
5950 INIT_LIST_HEAD(&dev->unreg_list);
5951 INIT_LIST_HEAD(&dev->link_watch_list);
5952 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5955 dev->num_tx_queues = txqs;
5956 dev->real_num_tx_queues = txqs;
5957 if (netif_alloc_netdev_queues(dev))
5961 dev->num_rx_queues = rxqs;
5962 dev->real_num_rx_queues = rxqs;
5963 if (netif_alloc_rx_queues(dev))
5967 strcpy(dev->name, name);
5968 dev->group = INIT_NETDEV_GROUP;
5976 free_percpu(dev->pcpu_refcnt);
5986 EXPORT_SYMBOL(alloc_netdev_mqs);
5989 * free_netdev - free network device
5992 * This function does the last stage of destroying an allocated device
5993 * interface. The reference to the device object is released.
5994 * If this is the last reference then it will be freed.
5996 void free_netdev(struct net_device *dev)
5998 struct napi_struct *p, *n;
6000 release_net(dev_net(dev));
6007 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6009 /* Flush device addresses */
6010 dev_addr_flush(dev);
6012 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6015 free_percpu(dev->pcpu_refcnt);
6016 dev->pcpu_refcnt = NULL;
6018 /* Compatibility with error handling in drivers */
6019 if (dev->reg_state == NETREG_UNINITIALIZED) {
6020 kfree((char *)dev - dev->padded);
6024 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6025 dev->reg_state = NETREG_RELEASED;
6027 /* will free via device release */
6028 put_device(&dev->dev);
6030 EXPORT_SYMBOL(free_netdev);
6033 * synchronize_net - Synchronize with packet receive processing
6035 * Wait for packets currently being received to be done.
6036 * Does not block later packets from starting.
6038 void synchronize_net(void)
6041 if (rtnl_is_locked())
6042 synchronize_rcu_expedited();
6046 EXPORT_SYMBOL(synchronize_net);
6049 * unregister_netdevice_queue - remove device from the kernel
6053 * This function shuts down a device interface and removes it
6054 * from the kernel tables.
6055 * If head not NULL, device is queued to be unregistered later.
6057 * Callers must hold the rtnl semaphore. You may want
6058 * unregister_netdev() instead of this.
6061 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6066 list_move_tail(&dev->unreg_list, head);
6068 rollback_registered(dev);
6069 /* Finish processing unregister after unlock */
6073 EXPORT_SYMBOL(unregister_netdevice_queue);
6076 * unregister_netdevice_many - unregister many devices
6077 * @head: list of devices
6079 void unregister_netdevice_many(struct list_head *head)
6081 struct net_device *dev;
6083 if (!list_empty(head)) {
6084 rollback_registered_many(head);
6085 list_for_each_entry(dev, head, unreg_list)
6089 EXPORT_SYMBOL(unregister_netdevice_many);
6092 * unregister_netdev - remove device from the kernel
6095 * This function shuts down a device interface and removes it
6096 * from the kernel tables.
6098 * This is just a wrapper for unregister_netdevice that takes
6099 * the rtnl semaphore. In general you want to use this and not
6100 * unregister_netdevice.
6102 void unregister_netdev(struct net_device *dev)
6105 unregister_netdevice(dev);
6108 EXPORT_SYMBOL(unregister_netdev);
6111 * dev_change_net_namespace - move device to different nethost namespace
6113 * @net: network namespace
6114 * @pat: If not NULL name pattern to try if the current device name
6115 * is already taken in the destination network namespace.
6117 * This function shuts down a device interface and moves it
6118 * to a new network namespace. On success 0 is returned, on
6119 * a failure a netagive errno code is returned.
6121 * Callers must hold the rtnl semaphore.
6124 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6130 /* Don't allow namespace local devices to be moved. */
6132 if (dev->features & NETIF_F_NETNS_LOCAL)
6135 /* Ensure the device has been registrered */
6137 if (dev->reg_state != NETREG_REGISTERED)
6140 /* Get out if there is nothing todo */
6142 if (net_eq(dev_net(dev), net))
6145 /* Pick the destination device name, and ensure
6146 * we can use it in the destination network namespace.
6149 if (__dev_get_by_name(net, dev->name)) {
6150 /* We get here if we can't use the current device name */
6153 if (dev_get_valid_name(dev, pat) < 0)
6158 * And now a mini version of register_netdevice unregister_netdevice.
6161 /* If device is running close it first. */
6164 /* And unlink it from device chain */
6166 unlist_netdevice(dev);
6170 /* Shutdown queueing discipline. */
6173 /* Notify protocols, that we are about to destroy
6174 this device. They should clean all the things.
6176 Note that dev->reg_state stays at NETREG_REGISTERED.
6177 This is wanted because this way 8021q and macvlan know
6178 the device is just moving and can keep their slaves up.
6180 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6181 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6182 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6185 * Flush the unicast and multicast chains
6190 /* Actually switch the network namespace */
6191 dev_net_set(dev, net);
6193 /* If there is an ifindex conflict assign a new one */
6194 if (__dev_get_by_index(net, dev->ifindex)) {
6195 int iflink = (dev->iflink == dev->ifindex);
6196 dev->ifindex = dev_new_index(net);
6198 dev->iflink = dev->ifindex;
6201 /* Fixup kobjects */
6202 err = device_rename(&dev->dev, dev->name);
6205 /* Add the device back in the hashes */
6206 list_netdevice(dev);
6208 /* Notify protocols, that a new device appeared. */
6209 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6212 * Prevent userspace races by waiting until the network
6213 * device is fully setup before sending notifications.
6215 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6222 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6224 static int dev_cpu_callback(struct notifier_block *nfb,
6225 unsigned long action,
6228 struct sk_buff **list_skb;
6229 struct sk_buff *skb;
6230 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6231 struct softnet_data *sd, *oldsd;
6233 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6236 local_irq_disable();
6237 cpu = smp_processor_id();
6238 sd = &per_cpu(softnet_data, cpu);
6239 oldsd = &per_cpu(softnet_data, oldcpu);
6241 /* Find end of our completion_queue. */
6242 list_skb = &sd->completion_queue;
6244 list_skb = &(*list_skb)->next;
6245 /* Append completion queue from offline CPU. */
6246 *list_skb = oldsd->completion_queue;
6247 oldsd->completion_queue = NULL;
6249 /* Append output queue from offline CPU. */
6250 if (oldsd->output_queue) {
6251 *sd->output_queue_tailp = oldsd->output_queue;
6252 sd->output_queue_tailp = oldsd->output_queue_tailp;
6253 oldsd->output_queue = NULL;
6254 oldsd->output_queue_tailp = &oldsd->output_queue;
6256 /* Append NAPI poll list from offline CPU. */
6257 if (!list_empty(&oldsd->poll_list)) {
6258 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6259 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6262 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6265 /* Process offline CPU's input_pkt_queue */
6266 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6268 input_queue_head_incr(oldsd);
6270 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6272 input_queue_head_incr(oldsd);
6280 * netdev_increment_features - increment feature set by one
6281 * @all: current feature set
6282 * @one: new feature set
6283 * @mask: mask feature set
6285 * Computes a new feature set after adding a device with feature set
6286 * @one to the master device with current feature set @all. Will not
6287 * enable anything that is off in @mask. Returns the new feature set.
6289 netdev_features_t netdev_increment_features(netdev_features_t all,
6290 netdev_features_t one, netdev_features_t mask)
6292 if (mask & NETIF_F_GEN_CSUM)
6293 mask |= NETIF_F_ALL_CSUM;
6294 mask |= NETIF_F_VLAN_CHALLENGED;
6296 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6297 all &= one | ~NETIF_F_ALL_FOR_ALL;
6299 /* If one device supports hw checksumming, set for all. */
6300 if (all & NETIF_F_GEN_CSUM)
6301 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6305 EXPORT_SYMBOL(netdev_increment_features);
6307 static struct hlist_head *netdev_create_hash(void)
6310 struct hlist_head *hash;
6312 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6314 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6315 INIT_HLIST_HEAD(&hash[i]);
6320 /* Initialize per network namespace state */
6321 static int __net_init netdev_init(struct net *net)
6323 if (net != &init_net)
6324 INIT_LIST_HEAD(&net->dev_base_head);
6326 net->dev_name_head = netdev_create_hash();
6327 if (net->dev_name_head == NULL)
6330 net->dev_index_head = netdev_create_hash();
6331 if (net->dev_index_head == NULL)
6337 kfree(net->dev_name_head);
6343 * netdev_drivername - network driver for the device
6344 * @dev: network device
6346 * Determine network driver for device.
6348 const char *netdev_drivername(const struct net_device *dev)
6350 const struct device_driver *driver;
6351 const struct device *parent;
6352 const char *empty = "";
6354 parent = dev->dev.parent;
6358 driver = parent->driver;
6359 if (driver && driver->name)
6360 return driver->name;
6364 int __netdev_printk(const char *level, const struct net_device *dev,
6365 struct va_format *vaf)
6369 if (dev && dev->dev.parent)
6370 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6371 netdev_name(dev), vaf);
6373 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6375 r = printk("%s(NULL net_device): %pV", level, vaf);
6379 EXPORT_SYMBOL(__netdev_printk);
6381 int netdev_printk(const char *level, const struct net_device *dev,
6382 const char *format, ...)
6384 struct va_format vaf;
6388 va_start(args, format);
6393 r = __netdev_printk(level, dev, &vaf);
6398 EXPORT_SYMBOL(netdev_printk);
6400 #define define_netdev_printk_level(func, level) \
6401 int func(const struct net_device *dev, const char *fmt, ...) \
6404 struct va_format vaf; \
6407 va_start(args, fmt); \
6412 r = __netdev_printk(level, dev, &vaf); \
6417 EXPORT_SYMBOL(func);
6419 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6420 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6421 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6422 define_netdev_printk_level(netdev_err, KERN_ERR);
6423 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6424 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6425 define_netdev_printk_level(netdev_info, KERN_INFO);
6427 static void __net_exit netdev_exit(struct net *net)
6429 kfree(net->dev_name_head);
6430 kfree(net->dev_index_head);
6433 static struct pernet_operations __net_initdata netdev_net_ops = {
6434 .init = netdev_init,
6435 .exit = netdev_exit,
6438 static void __net_exit default_device_exit(struct net *net)
6440 struct net_device *dev, *aux;
6442 * Push all migratable network devices back to the
6443 * initial network namespace
6446 for_each_netdev_safe(net, dev, aux) {
6448 char fb_name[IFNAMSIZ];
6450 /* Ignore unmoveable devices (i.e. loopback) */
6451 if (dev->features & NETIF_F_NETNS_LOCAL)
6454 /* Leave virtual devices for the generic cleanup */
6455 if (dev->rtnl_link_ops)
6458 /* Push remaining network devices to init_net */
6459 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6460 err = dev_change_net_namespace(dev, &init_net, fb_name);
6462 pr_emerg("%s: failed to move %s to init_net: %d\n",
6463 __func__, dev->name, err);
6470 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6472 /* At exit all network devices most be removed from a network
6473 * namespace. Do this in the reverse order of registration.
6474 * Do this across as many network namespaces as possible to
6475 * improve batching efficiency.
6477 struct net_device *dev;
6479 LIST_HEAD(dev_kill_list);
6482 list_for_each_entry(net, net_list, exit_list) {
6483 for_each_netdev_reverse(net, dev) {
6484 if (dev->rtnl_link_ops)
6485 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6487 unregister_netdevice_queue(dev, &dev_kill_list);
6490 unregister_netdevice_many(&dev_kill_list);
6491 list_del(&dev_kill_list);
6495 static struct pernet_operations __net_initdata default_device_ops = {
6496 .exit = default_device_exit,
6497 .exit_batch = default_device_exit_batch,
6501 * Initialize the DEV module. At boot time this walks the device list and
6502 * unhooks any devices that fail to initialise (normally hardware not
6503 * present) and leaves us with a valid list of present and active devices.
6508 * This is called single threaded during boot, so no need
6509 * to take the rtnl semaphore.
6511 static int __init net_dev_init(void)
6513 int i, rc = -ENOMEM;
6515 BUG_ON(!dev_boot_phase);
6517 if (dev_proc_init())
6520 if (netdev_kobject_init())
6523 INIT_LIST_HEAD(&ptype_all);
6524 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6525 INIT_LIST_HEAD(&ptype_base[i]);
6527 if (register_pernet_subsys(&netdev_net_ops))
6531 * Initialise the packet receive queues.
6534 for_each_possible_cpu(i) {
6535 struct softnet_data *sd = &per_cpu(softnet_data, i);
6537 memset(sd, 0, sizeof(*sd));
6538 skb_queue_head_init(&sd->input_pkt_queue);
6539 skb_queue_head_init(&sd->process_queue);
6540 sd->completion_queue = NULL;
6541 INIT_LIST_HEAD(&sd->poll_list);
6542 sd->output_queue = NULL;
6543 sd->output_queue_tailp = &sd->output_queue;
6545 sd->csd.func = rps_trigger_softirq;
6551 sd->backlog.poll = process_backlog;
6552 sd->backlog.weight = weight_p;
6553 sd->backlog.gro_list = NULL;
6554 sd->backlog.gro_count = 0;
6559 /* The loopback device is special if any other network devices
6560 * is present in a network namespace the loopback device must
6561 * be present. Since we now dynamically allocate and free the
6562 * loopback device ensure this invariant is maintained by
6563 * keeping the loopback device as the first device on the
6564 * list of network devices. Ensuring the loopback devices
6565 * is the first device that appears and the last network device
6568 if (register_pernet_device(&loopback_net_ops))
6571 if (register_pernet_device(&default_device_ops))
6574 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6575 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6577 hotcpu_notifier(dev_cpu_callback, 0);
6585 subsys_initcall(net_dev_init);
6587 static int __init initialize_hashrnd(void)
6589 get_random_bytes(&hashrnd, sizeof(hashrnd));
6593 late_initcall_sync(initialize_hashrnd);