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 <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
135 #include <linux/cpu_rmap.h>
136 #include <linux/if_tunnel.h>
137 #include <linux/if_pppox.h>
138 #include <linux/ppp_defs.h>
139 #include <linux/net_tstamp.h>
141 #include "net-sysfs.h"
143 /* Instead of increasing this, you should create a hash table. */
144 #define MAX_GRO_SKBS 8
146 /* This should be increased if a protocol with a bigger head is added. */
147 #define GRO_MAX_HEAD (MAX_HEADER + 128)
150 * The list of packet types we will receive (as opposed to discard)
151 * and the routines to invoke.
153 * Why 16. Because with 16 the only overlap we get on a hash of the
154 * low nibble of the protocol value is RARP/SNAP/X.25.
156 * NOTE: That is no longer true with the addition of VLAN tags. Not
157 * sure which should go first, but I bet it won't make much
158 * difference if we are running VLANs. The good news is that
159 * this protocol won't be in the list unless compiled in, so
160 * the average user (w/out VLANs) will not be adversely affected.
177 #define PTYPE_HASH_SIZE (16)
178 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
180 static DEFINE_SPINLOCK(ptype_lock);
181 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
182 static struct list_head ptype_all __read_mostly; /* Taps */
185 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
188 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
190 * Writers must hold the rtnl semaphore while they loop through the
191 * dev_base_head list, and hold dev_base_lock for writing when they do the
192 * actual updates. This allows pure readers to access the list even
193 * while a writer is preparing to update it.
195 * To put it another way, dev_base_lock is held for writing only to
196 * protect against pure readers; the rtnl semaphore provides the
197 * protection against other writers.
199 * See, for example usages, register_netdevice() and
200 * unregister_netdevice(), which must be called with the rtnl
203 DEFINE_RWLOCK(dev_base_lock);
204 EXPORT_SYMBOL(dev_base_lock);
206 static inline void dev_base_seq_inc(struct net *net)
208 while (++net->dev_base_seq == 0);
211 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
213 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
214 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
217 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
219 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
222 static inline void rps_lock(struct softnet_data *sd)
225 spin_lock(&sd->input_pkt_queue.lock);
229 static inline void rps_unlock(struct softnet_data *sd)
232 spin_unlock(&sd->input_pkt_queue.lock);
236 /* Device list insertion */
237 static int list_netdevice(struct net_device *dev)
239 struct net *net = dev_net(dev);
243 write_lock_bh(&dev_base_lock);
244 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
245 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
246 hlist_add_head_rcu(&dev->index_hlist,
247 dev_index_hash(net, dev->ifindex));
248 write_unlock_bh(&dev_base_lock);
250 dev_base_seq_inc(net);
255 /* Device list removal
256 * caller must respect a RCU grace period before freeing/reusing dev
258 static void unlist_netdevice(struct net_device *dev)
262 /* Unlink dev from the device chain */
263 write_lock_bh(&dev_base_lock);
264 list_del_rcu(&dev->dev_list);
265 hlist_del_rcu(&dev->name_hlist);
266 hlist_del_rcu(&dev->index_hlist);
267 write_unlock_bh(&dev_base_lock);
269 dev_base_seq_inc(dev_net(dev));
276 static RAW_NOTIFIER_HEAD(netdev_chain);
279 * Device drivers call our routines to queue packets here. We empty the
280 * queue in the local softnet handler.
283 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
284 EXPORT_PER_CPU_SYMBOL(softnet_data);
286 #ifdef CONFIG_LOCKDEP
288 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
289 * according to dev->type
291 static const unsigned short netdev_lock_type[] =
292 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
293 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
294 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
295 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
296 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
297 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
298 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
299 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
300 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
301 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
302 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
303 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
304 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
305 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
306 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
307 ARPHRD_VOID, ARPHRD_NONE};
309 static const char *const netdev_lock_name[] =
310 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
311 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
312 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
313 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
314 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
315 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
316 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
317 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
318 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
319 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
320 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
321 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
322 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
323 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
324 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
325 "_xmit_VOID", "_xmit_NONE"};
327 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
328 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
330 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
334 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
335 if (netdev_lock_type[i] == dev_type)
337 /* the last key is used by default */
338 return ARRAY_SIZE(netdev_lock_type) - 1;
341 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
342 unsigned short dev_type)
346 i = netdev_lock_pos(dev_type);
347 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
348 netdev_lock_name[i]);
351 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 i = netdev_lock_pos(dev->type);
356 lockdep_set_class_and_name(&dev->addr_list_lock,
357 &netdev_addr_lock_key[i],
358 netdev_lock_name[i]);
361 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
362 unsigned short dev_type)
365 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
370 /*******************************************************************************
372 Protocol management and registration routines
374 *******************************************************************************/
377 * Add a protocol ID to the list. Now that the input handler is
378 * smarter we can dispense with all the messy stuff that used to be
381 * BEWARE!!! Protocol handlers, mangling input packets,
382 * MUST BE last in hash buckets and checking protocol handlers
383 * MUST start from promiscuous ptype_all chain in net_bh.
384 * It is true now, do not change it.
385 * Explanation follows: if protocol handler, mangling packet, will
386 * be the first on list, it is not able to sense, that packet
387 * is cloned and should be copied-on-write, so that it will
388 * change it and subsequent readers will get broken packet.
392 static inline struct list_head *ptype_head(const struct packet_type *pt)
394 if (pt->type == htons(ETH_P_ALL))
397 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
401 * dev_add_pack - add packet handler
402 * @pt: packet type declaration
404 * Add a protocol handler to the networking stack. The passed &packet_type
405 * is linked into kernel lists and may not be freed until it has been
406 * removed from the kernel lists.
408 * This call does not sleep therefore it can not
409 * guarantee all CPU's that are in middle of receiving packets
410 * will see the new packet type (until the next received packet).
413 void dev_add_pack(struct packet_type *pt)
415 struct list_head *head = ptype_head(pt);
417 spin_lock(&ptype_lock);
418 list_add_rcu(&pt->list, head);
419 spin_unlock(&ptype_lock);
421 EXPORT_SYMBOL(dev_add_pack);
424 * __dev_remove_pack - remove packet handler
425 * @pt: packet type declaration
427 * Remove a protocol handler that was previously added to the kernel
428 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
429 * from the kernel lists and can be freed or reused once this function
432 * The packet type might still be in use by receivers
433 * and must not be freed until after all the CPU's have gone
434 * through a quiescent state.
436 void __dev_remove_pack(struct packet_type *pt)
438 struct list_head *head = ptype_head(pt);
439 struct packet_type *pt1;
441 spin_lock(&ptype_lock);
443 list_for_each_entry(pt1, head, list) {
445 list_del_rcu(&pt->list);
450 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
452 spin_unlock(&ptype_lock);
454 EXPORT_SYMBOL(__dev_remove_pack);
457 * dev_remove_pack - remove packet handler
458 * @pt: packet type declaration
460 * Remove a protocol handler that was previously added to the kernel
461 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
462 * from the kernel lists and can be freed or reused once this function
465 * This call sleeps to guarantee that no CPU is looking at the packet
468 void dev_remove_pack(struct packet_type *pt)
470 __dev_remove_pack(pt);
474 EXPORT_SYMBOL(dev_remove_pack);
476 /******************************************************************************
478 Device Boot-time Settings Routines
480 *******************************************************************************/
482 /* Boot time configuration table */
483 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
486 * netdev_boot_setup_add - add new setup entry
487 * @name: name of the device
488 * @map: configured settings for the device
490 * Adds new setup entry to the dev_boot_setup list. The function
491 * returns 0 on error and 1 on success. This is a generic routine to
494 static int netdev_boot_setup_add(char *name, struct ifmap *map)
496 struct netdev_boot_setup *s;
500 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
501 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
502 memset(s[i].name, 0, sizeof(s[i].name));
503 strlcpy(s[i].name, name, IFNAMSIZ);
504 memcpy(&s[i].map, map, sizeof(s[i].map));
509 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
513 * netdev_boot_setup_check - check boot time settings
514 * @dev: the netdevice
516 * Check boot time settings for the device.
517 * The found settings are set for the device to be used
518 * later in the device probing.
519 * Returns 0 if no settings found, 1 if they are.
521 int netdev_boot_setup_check(struct net_device *dev)
523 struct netdev_boot_setup *s = dev_boot_setup;
526 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
527 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
528 !strcmp(dev->name, s[i].name)) {
529 dev->irq = s[i].map.irq;
530 dev->base_addr = s[i].map.base_addr;
531 dev->mem_start = s[i].map.mem_start;
532 dev->mem_end = s[i].map.mem_end;
538 EXPORT_SYMBOL(netdev_boot_setup_check);
542 * netdev_boot_base - get address from boot time settings
543 * @prefix: prefix for network device
544 * @unit: id for network device
546 * Check boot time settings for the base address of device.
547 * The found settings are set for the device to be used
548 * later in the device probing.
549 * Returns 0 if no settings found.
551 unsigned long netdev_boot_base(const char *prefix, int unit)
553 const struct netdev_boot_setup *s = dev_boot_setup;
557 sprintf(name, "%s%d", prefix, unit);
560 * If device already registered then return base of 1
561 * to indicate not to probe for this interface
563 if (__dev_get_by_name(&init_net, name))
566 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
567 if (!strcmp(name, s[i].name))
568 return s[i].map.base_addr;
573 * Saves at boot time configured settings for any netdevice.
575 int __init netdev_boot_setup(char *str)
580 str = get_options(str, ARRAY_SIZE(ints), ints);
585 memset(&map, 0, sizeof(map));
589 map.base_addr = ints[2];
591 map.mem_start = ints[3];
593 map.mem_end = ints[4];
595 /* Add new entry to the list */
596 return netdev_boot_setup_add(str, &map);
599 __setup("netdev=", netdev_boot_setup);
601 /*******************************************************************************
603 Device Interface Subroutines
605 *******************************************************************************/
608 * __dev_get_by_name - find a device by its name
609 * @net: the applicable net namespace
610 * @name: name to find
612 * Find an interface by name. Must be called under RTNL semaphore
613 * or @dev_base_lock. If the name is found a pointer to the device
614 * is returned. If the name is not found then %NULL is returned. The
615 * reference counters are not incremented so the caller must be
616 * careful with locks.
619 struct net_device *__dev_get_by_name(struct net *net, const char *name)
621 struct hlist_node *p;
622 struct net_device *dev;
623 struct hlist_head *head = dev_name_hash(net, name);
625 hlist_for_each_entry(dev, p, head, name_hlist)
626 if (!strncmp(dev->name, name, IFNAMSIZ))
631 EXPORT_SYMBOL(__dev_get_by_name);
634 * dev_get_by_name_rcu - find a device by its name
635 * @net: the applicable net namespace
636 * @name: name to find
638 * Find an interface by name.
639 * If the name is found a pointer to the device is returned.
640 * If the name is not found then %NULL is returned.
641 * The reference counters are not incremented so the caller must be
642 * careful with locks. The caller must hold RCU lock.
645 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
647 struct hlist_node *p;
648 struct net_device *dev;
649 struct hlist_head *head = dev_name_hash(net, name);
651 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
652 if (!strncmp(dev->name, name, IFNAMSIZ))
657 EXPORT_SYMBOL(dev_get_by_name_rcu);
660 * dev_get_by_name - find a device by its name
661 * @net: the applicable net namespace
662 * @name: name to find
664 * Find an interface by name. This can be called from any
665 * context and does its own locking. The returned handle has
666 * the usage count incremented and the caller must use dev_put() to
667 * release it when it is no longer needed. %NULL is returned if no
668 * matching device is found.
671 struct net_device *dev_get_by_name(struct net *net, const char *name)
673 struct net_device *dev;
676 dev = dev_get_by_name_rcu(net, name);
682 EXPORT_SYMBOL(dev_get_by_name);
685 * __dev_get_by_index - find a device by its ifindex
686 * @net: the applicable net namespace
687 * @ifindex: index of device
689 * Search for an interface by index. Returns %NULL if the device
690 * is not found or a pointer to the device. The device has not
691 * had its reference counter increased so the caller must be careful
692 * about locking. The caller must hold either the RTNL semaphore
696 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
698 struct hlist_node *p;
699 struct net_device *dev;
700 struct hlist_head *head = dev_index_hash(net, ifindex);
702 hlist_for_each_entry(dev, p, head, index_hlist)
703 if (dev->ifindex == ifindex)
708 EXPORT_SYMBOL(__dev_get_by_index);
711 * dev_get_by_index_rcu - find a device by its ifindex
712 * @net: the applicable net namespace
713 * @ifindex: index of device
715 * Search for an interface by index. Returns %NULL if the device
716 * is not found or a pointer to the device. The device has not
717 * had its reference counter increased so the caller must be careful
718 * about locking. The caller must hold RCU lock.
721 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
723 struct hlist_node *p;
724 struct net_device *dev;
725 struct hlist_head *head = dev_index_hash(net, ifindex);
727 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
728 if (dev->ifindex == ifindex)
733 EXPORT_SYMBOL(dev_get_by_index_rcu);
737 * dev_get_by_index - find a device by its ifindex
738 * @net: the applicable net namespace
739 * @ifindex: index of device
741 * Search for an interface by index. Returns NULL if the device
742 * is not found or a pointer to the device. The device returned has
743 * had a reference added and the pointer is safe until the user calls
744 * dev_put to indicate they have finished with it.
747 struct net_device *dev_get_by_index(struct net *net, int ifindex)
749 struct net_device *dev;
752 dev = dev_get_by_index_rcu(net, ifindex);
758 EXPORT_SYMBOL(dev_get_by_index);
761 * dev_getbyhwaddr_rcu - find a device by its hardware address
762 * @net: the applicable net namespace
763 * @type: media type of device
764 * @ha: hardware address
766 * Search for an interface by MAC address. Returns NULL if the device
767 * is not found or a pointer to the device.
768 * The caller must hold RCU or RTNL.
769 * The returned device has not had its ref count increased
770 * and the caller must therefore be careful about locking
774 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
777 struct net_device *dev;
779 for_each_netdev_rcu(net, dev)
780 if (dev->type == type &&
781 !memcmp(dev->dev_addr, ha, dev->addr_len))
786 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
788 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
790 struct net_device *dev;
793 for_each_netdev(net, dev)
794 if (dev->type == type)
799 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
801 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
803 struct net_device *dev, *ret = NULL;
806 for_each_netdev_rcu(net, dev)
807 if (dev->type == type) {
815 EXPORT_SYMBOL(dev_getfirstbyhwtype);
818 * dev_get_by_flags_rcu - find any device with given flags
819 * @net: the applicable net namespace
820 * @if_flags: IFF_* values
821 * @mask: bitmask of bits in if_flags to check
823 * Search for any interface with the given flags. Returns NULL if a device
824 * is not found or a pointer to the device. Must be called inside
825 * rcu_read_lock(), and result refcount is unchanged.
828 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
831 struct net_device *dev, *ret;
834 for_each_netdev_rcu(net, dev) {
835 if (((dev->flags ^ if_flags) & mask) == 0) {
842 EXPORT_SYMBOL(dev_get_by_flags_rcu);
845 * dev_valid_name - check if name is okay for network device
848 * Network device names need to be valid file names to
849 * to allow sysfs to work. We also disallow any kind of
852 int dev_valid_name(const char *name)
856 if (strlen(name) >= IFNAMSIZ)
858 if (!strcmp(name, ".") || !strcmp(name, ".."))
862 if (*name == '/' || isspace(*name))
868 EXPORT_SYMBOL(dev_valid_name);
871 * __dev_alloc_name - allocate a name for a device
872 * @net: network namespace to allocate the device name in
873 * @name: name format string
874 * @buf: scratch buffer and result name string
876 * Passed a format string - eg "lt%d" it will try and find a suitable
877 * id. It scans list of devices to build up a free map, then chooses
878 * the first empty slot. The caller must hold the dev_base or rtnl lock
879 * while allocating the name and adding the device in order to avoid
881 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
882 * Returns the number of the unit assigned or a negative errno code.
885 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
889 const int max_netdevices = 8*PAGE_SIZE;
890 unsigned long *inuse;
891 struct net_device *d;
893 p = strnchr(name, IFNAMSIZ-1, '%');
896 * Verify the string as this thing may have come from
897 * the user. There must be either one "%d" and no other "%"
900 if (p[1] != 'd' || strchr(p + 2, '%'))
903 /* Use one page as a bit array of possible slots */
904 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
908 for_each_netdev(net, d) {
909 if (!sscanf(d->name, name, &i))
911 if (i < 0 || i >= max_netdevices)
914 /* avoid cases where sscanf is not exact inverse of printf */
915 snprintf(buf, IFNAMSIZ, name, i);
916 if (!strncmp(buf, d->name, IFNAMSIZ))
920 i = find_first_zero_bit(inuse, max_netdevices);
921 free_page((unsigned long) inuse);
925 snprintf(buf, IFNAMSIZ, name, i);
926 if (!__dev_get_by_name(net, buf))
929 /* It is possible to run out of possible slots
930 * when the name is long and there isn't enough space left
931 * for the digits, or if all bits are used.
937 * dev_alloc_name - allocate a name for a device
939 * @name: name format string
941 * Passed a format string - eg "lt%d" it will try and find a suitable
942 * id. It scans list of devices to build up a free map, then chooses
943 * the first empty slot. The caller must hold the dev_base or rtnl lock
944 * while allocating the name and adding the device in order to avoid
946 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
947 * Returns the number of the unit assigned or a negative errno code.
950 int dev_alloc_name(struct net_device *dev, const char *name)
956 BUG_ON(!dev_net(dev));
958 ret = __dev_alloc_name(net, name, buf);
960 strlcpy(dev->name, buf, IFNAMSIZ);
963 EXPORT_SYMBOL(dev_alloc_name);
965 static int dev_get_valid_name(struct net_device *dev, const char *name)
969 BUG_ON(!dev_net(dev));
972 if (!dev_valid_name(name))
975 if (strchr(name, '%'))
976 return dev_alloc_name(dev, name);
977 else if (__dev_get_by_name(net, name))
979 else if (dev->name != name)
980 strlcpy(dev->name, name, IFNAMSIZ);
986 * dev_change_name - change name of a device
988 * @newname: name (or format string) must be at least IFNAMSIZ
990 * Change name of a device, can pass format strings "eth%d".
993 int dev_change_name(struct net_device *dev, const char *newname)
995 char oldname[IFNAMSIZ];
1001 BUG_ON(!dev_net(dev));
1004 if (dev->flags & IFF_UP)
1007 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1010 memcpy(oldname, dev->name, IFNAMSIZ);
1012 err = dev_get_valid_name(dev, newname);
1017 ret = device_rename(&dev->dev, dev->name);
1019 memcpy(dev->name, oldname, IFNAMSIZ);
1023 write_lock_bh(&dev_base_lock);
1024 hlist_del_rcu(&dev->name_hlist);
1025 write_unlock_bh(&dev_base_lock);
1029 write_lock_bh(&dev_base_lock);
1030 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1031 write_unlock_bh(&dev_base_lock);
1033 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1034 ret = notifier_to_errno(ret);
1037 /* err >= 0 after dev_alloc_name() or stores the first errno */
1040 memcpy(dev->name, oldname, IFNAMSIZ);
1044 "%s: name change rollback failed: %d.\n",
1053 * dev_set_alias - change ifalias of a device
1055 * @alias: name up to IFALIASZ
1056 * @len: limit of bytes to copy from info
1058 * Set ifalias for a device,
1060 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1066 if (len >= IFALIASZ)
1071 kfree(dev->ifalias);
1072 dev->ifalias = NULL;
1077 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1080 dev->ifalias = new_ifalias;
1082 strlcpy(dev->ifalias, alias, len+1);
1088 * netdev_features_change - device changes features
1089 * @dev: device to cause notification
1091 * Called to indicate a device has changed features.
1093 void netdev_features_change(struct net_device *dev)
1095 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1097 EXPORT_SYMBOL(netdev_features_change);
1100 * netdev_state_change - device changes state
1101 * @dev: device to cause notification
1103 * Called to indicate a device has changed state. This function calls
1104 * the notifier chains for netdev_chain and sends a NEWLINK message
1105 * to the routing socket.
1107 void netdev_state_change(struct net_device *dev)
1109 if (dev->flags & IFF_UP) {
1110 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1111 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1114 EXPORT_SYMBOL(netdev_state_change);
1116 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1118 return call_netdevice_notifiers(event, dev);
1120 EXPORT_SYMBOL(netdev_bonding_change);
1123 * dev_load - load a network module
1124 * @net: the applicable net namespace
1125 * @name: name of interface
1127 * If a network interface is not present and the process has suitable
1128 * privileges this function loads the module. If module loading is not
1129 * available in this kernel then it becomes a nop.
1132 void dev_load(struct net *net, const char *name)
1134 struct net_device *dev;
1138 dev = dev_get_by_name_rcu(net, name);
1142 if (no_module && capable(CAP_NET_ADMIN))
1143 no_module = request_module("netdev-%s", name);
1144 if (no_module && capable(CAP_SYS_MODULE)) {
1145 if (!request_module("%s", name))
1146 pr_err("Loading kernel module for a network device "
1147 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1151 EXPORT_SYMBOL(dev_load);
1153 static int __dev_open(struct net_device *dev)
1155 const struct net_device_ops *ops = dev->netdev_ops;
1160 if (!netif_device_present(dev))
1163 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1164 ret = notifier_to_errno(ret);
1168 set_bit(__LINK_STATE_START, &dev->state);
1170 if (ops->ndo_validate_addr)
1171 ret = ops->ndo_validate_addr(dev);
1173 if (!ret && ops->ndo_open)
1174 ret = ops->ndo_open(dev);
1177 clear_bit(__LINK_STATE_START, &dev->state);
1179 dev->flags |= IFF_UP;
1180 net_dmaengine_get();
1181 dev_set_rx_mode(dev);
1183 add_device_randomness(dev->dev_addr, dev->addr_len);
1190 * dev_open - prepare an interface for use.
1191 * @dev: device to open
1193 * Takes a device from down to up state. The device's private open
1194 * function is invoked and then the multicast lists are loaded. Finally
1195 * the device is moved into the up state and a %NETDEV_UP message is
1196 * sent to the netdev notifier chain.
1198 * Calling this function on an active interface is a nop. On a failure
1199 * a negative errno code is returned.
1201 int dev_open(struct net_device *dev)
1205 if (dev->flags & IFF_UP)
1208 ret = __dev_open(dev);
1212 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1213 call_netdevice_notifiers(NETDEV_UP, dev);
1217 EXPORT_SYMBOL(dev_open);
1219 static int __dev_close_many(struct list_head *head)
1221 struct net_device *dev;
1226 list_for_each_entry(dev, head, unreg_list) {
1227 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1229 clear_bit(__LINK_STATE_START, &dev->state);
1231 /* Synchronize to scheduled poll. We cannot touch poll list, it
1232 * can be even on different cpu. So just clear netif_running().
1234 * dev->stop() will invoke napi_disable() on all of it's
1235 * napi_struct instances on this device.
1237 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1240 dev_deactivate_many(head);
1242 list_for_each_entry(dev, head, unreg_list) {
1243 const struct net_device_ops *ops = dev->netdev_ops;
1246 * Call the device specific close. This cannot fail.
1247 * Only if device is UP
1249 * We allow it to be called even after a DETACH hot-plug
1255 dev->flags &= ~IFF_UP;
1256 net_dmaengine_put();
1262 static int __dev_close(struct net_device *dev)
1267 list_add(&dev->unreg_list, &single);
1268 retval = __dev_close_many(&single);
1273 static int dev_close_many(struct list_head *head)
1275 struct net_device *dev, *tmp;
1276 LIST_HEAD(tmp_list);
1278 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1279 if (!(dev->flags & IFF_UP))
1280 list_move(&dev->unreg_list, &tmp_list);
1282 __dev_close_many(head);
1284 list_for_each_entry(dev, head, unreg_list) {
1285 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1286 call_netdevice_notifiers(NETDEV_DOWN, dev);
1289 /* rollback_registered_many needs the complete original list */
1290 list_splice(&tmp_list, head);
1295 * dev_close - shutdown an interface.
1296 * @dev: device to shutdown
1298 * This function moves an active device into down state. A
1299 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1300 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1303 int dev_close(struct net_device *dev)
1305 if (dev->flags & IFF_UP) {
1308 list_add(&dev->unreg_list, &single);
1309 dev_close_many(&single);
1314 EXPORT_SYMBOL(dev_close);
1318 * dev_disable_lro - disable Large Receive Offload on a device
1321 * Disable Large Receive Offload (LRO) on a net device. Must be
1322 * called under RTNL. This is needed if received packets may be
1323 * forwarded to another interface.
1325 void dev_disable_lro(struct net_device *dev)
1330 * If we're trying to disable lro on a vlan device
1331 * use the underlying physical device instead
1333 if (is_vlan_dev(dev))
1334 dev = vlan_dev_real_dev(dev);
1336 if (dev->ethtool_ops && dev->ethtool_ops->get_flags)
1337 flags = dev->ethtool_ops->get_flags(dev);
1339 flags = ethtool_op_get_flags(dev);
1341 if (!(flags & ETH_FLAG_LRO))
1344 __ethtool_set_flags(dev, flags & ~ETH_FLAG_LRO);
1345 if (unlikely(dev->features & NETIF_F_LRO))
1346 netdev_WARN(dev, "failed to disable LRO!\n");
1348 EXPORT_SYMBOL(dev_disable_lro);
1351 static int dev_boot_phase = 1;
1354 * register_netdevice_notifier - register a network notifier block
1357 * Register a notifier to be called when network device events occur.
1358 * The notifier passed is linked into the kernel structures and must
1359 * not be reused until it has been unregistered. A negative errno code
1360 * is returned on a failure.
1362 * When registered all registration and up events are replayed
1363 * to the new notifier to allow device to have a race free
1364 * view of the network device list.
1367 int register_netdevice_notifier(struct notifier_block *nb)
1369 struct net_device *dev;
1370 struct net_device *last;
1375 err = raw_notifier_chain_register(&netdev_chain, nb);
1381 for_each_netdev(net, dev) {
1382 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1383 err = notifier_to_errno(err);
1387 if (!(dev->flags & IFF_UP))
1390 nb->notifier_call(nb, NETDEV_UP, dev);
1401 for_each_netdev(net, dev) {
1405 if (dev->flags & IFF_UP) {
1406 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1407 nb->notifier_call(nb, NETDEV_DOWN, dev);
1409 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1410 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1415 raw_notifier_chain_unregister(&netdev_chain, nb);
1418 EXPORT_SYMBOL(register_netdevice_notifier);
1421 * unregister_netdevice_notifier - unregister a network notifier block
1424 * Unregister a notifier previously registered by
1425 * register_netdevice_notifier(). The notifier is unlinked into the
1426 * kernel structures and may then be reused. A negative errno code
1427 * is returned on a failure.
1429 * After unregistering unregister and down device events are synthesized
1430 * for all devices on the device list to the removed notifier to remove
1431 * the need for special case cleanup code.
1434 int unregister_netdevice_notifier(struct notifier_block *nb)
1436 struct net_device *dev;
1441 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1446 for_each_netdev(net, dev) {
1447 if (dev->flags & IFF_UP) {
1448 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1449 nb->notifier_call(nb, NETDEV_DOWN, dev);
1451 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1452 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1459 EXPORT_SYMBOL(unregister_netdevice_notifier);
1462 * call_netdevice_notifiers - call all network notifier blocks
1463 * @val: value passed unmodified to notifier function
1464 * @dev: net_device pointer passed unmodified to notifier function
1466 * Call all network notifier blocks. Parameters and return value
1467 * are as for raw_notifier_call_chain().
1470 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1473 return raw_notifier_call_chain(&netdev_chain, val, dev);
1475 EXPORT_SYMBOL(call_netdevice_notifiers);
1477 /* When > 0 there are consumers of rx skb time stamps */
1478 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1480 void net_enable_timestamp(void)
1482 atomic_inc(&netstamp_needed);
1484 EXPORT_SYMBOL(net_enable_timestamp);
1486 void net_disable_timestamp(void)
1488 atomic_dec(&netstamp_needed);
1490 EXPORT_SYMBOL(net_disable_timestamp);
1492 static inline void net_timestamp_set(struct sk_buff *skb)
1494 if (atomic_read(&netstamp_needed))
1495 __net_timestamp(skb);
1497 skb->tstamp.tv64 = 0;
1500 static inline void net_timestamp_check(struct sk_buff *skb)
1502 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1503 __net_timestamp(skb);
1506 static int net_hwtstamp_validate(struct ifreq *ifr)
1508 struct hwtstamp_config cfg;
1509 enum hwtstamp_tx_types tx_type;
1510 enum hwtstamp_rx_filters rx_filter;
1511 int tx_type_valid = 0;
1512 int rx_filter_valid = 0;
1514 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1517 if (cfg.flags) /* reserved for future extensions */
1520 tx_type = cfg.tx_type;
1521 rx_filter = cfg.rx_filter;
1524 case HWTSTAMP_TX_OFF:
1525 case HWTSTAMP_TX_ON:
1526 case HWTSTAMP_TX_ONESTEP_SYNC:
1531 switch (rx_filter) {
1532 case HWTSTAMP_FILTER_NONE:
1533 case HWTSTAMP_FILTER_ALL:
1534 case HWTSTAMP_FILTER_SOME:
1535 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1536 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1537 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1538 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1539 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1540 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1541 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1542 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1543 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1544 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1545 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1546 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1547 rx_filter_valid = 1;
1551 if (!tx_type_valid || !rx_filter_valid)
1557 static inline bool is_skb_forwardable(struct net_device *dev,
1558 struct sk_buff *skb)
1562 if (!(dev->flags & IFF_UP))
1565 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1566 if (skb->len <= len)
1569 /* if TSO is enabled, we don't care about the length as the packet
1570 * could be forwarded without being segmented before
1572 if (skb_is_gso(skb))
1579 * dev_forward_skb - loopback an skb to another netif
1581 * @dev: destination network device
1582 * @skb: buffer to forward
1585 * NET_RX_SUCCESS (no congestion)
1586 * NET_RX_DROP (packet was dropped, but freed)
1588 * dev_forward_skb can be used for injecting an skb from the
1589 * start_xmit function of one device into the receive queue
1590 * of another device.
1592 * The receiving device may be in another namespace, so
1593 * we have to clear all information in the skb that could
1594 * impact namespace isolation.
1596 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1598 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1599 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1600 atomic_long_inc(&dev->rx_dropped);
1609 if (unlikely(!is_skb_forwardable(dev, skb))) {
1610 atomic_long_inc(&dev->rx_dropped);
1616 skb->tstamp.tv64 = 0;
1617 skb->pkt_type = PACKET_HOST;
1618 skb->protocol = eth_type_trans(skb, dev);
1622 nf_reset_trace(skb);
1623 return netif_rx(skb);
1625 EXPORT_SYMBOL_GPL(dev_forward_skb);
1627 static inline int deliver_skb(struct sk_buff *skb,
1628 struct packet_type *pt_prev,
1629 struct net_device *orig_dev)
1631 atomic_inc(&skb->users);
1632 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1635 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1637 if (!ptype->af_packet_priv || !skb->sk)
1640 if (ptype->id_match)
1641 return ptype->id_match(ptype, skb->sk);
1642 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1649 * Support routine. Sends outgoing frames to any network
1650 * taps currently in use.
1653 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1655 struct packet_type *ptype;
1656 struct sk_buff *skb2 = NULL;
1657 struct packet_type *pt_prev = NULL;
1660 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1661 /* Never send packets back to the socket
1662 * they originated from - MvS (miquels@drinkel.ow.org)
1664 if ((ptype->dev == dev || !ptype->dev) &&
1665 (!skb_loop_sk(ptype, skb))) {
1667 deliver_skb(skb2, pt_prev, skb->dev);
1672 skb2 = skb_clone(skb, GFP_ATOMIC);
1676 net_timestamp_set(skb2);
1678 /* skb->nh should be correctly
1679 set by sender, so that the second statement is
1680 just protection against buggy protocols.
1682 skb_reset_mac_header(skb2);
1684 if (skb_network_header(skb2) < skb2->data ||
1685 skb2->network_header > skb2->tail) {
1686 if (net_ratelimit())
1687 printk(KERN_CRIT "protocol %04x is "
1689 ntohs(skb2->protocol),
1691 skb_reset_network_header(skb2);
1694 skb2->transport_header = skb2->network_header;
1695 skb2->pkt_type = PACKET_OUTGOING;
1700 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1704 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1705 * @dev: Network device
1706 * @txq: number of queues available
1708 * If real_num_tx_queues is changed the tc mappings may no longer be
1709 * valid. To resolve this verify the tc mapping remains valid and if
1710 * not NULL the mapping. With no priorities mapping to this
1711 * offset/count pair it will no longer be used. In the worst case TC0
1712 * is invalid nothing can be done so disable priority mappings. If is
1713 * expected that drivers will fix this mapping if they can before
1714 * calling netif_set_real_num_tx_queues.
1716 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1719 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1721 /* If TC0 is invalidated disable TC mapping */
1722 if (tc->offset + tc->count > txq) {
1723 pr_warning("Number of in use tx queues changed "
1724 "invalidating tc mappings. Priority "
1725 "traffic classification disabled!\n");
1730 /* Invalidated prio to tc mappings set to TC0 */
1731 for (i = 1; i < TC_BITMASK + 1; i++) {
1732 int q = netdev_get_prio_tc_map(dev, i);
1734 tc = &dev->tc_to_txq[q];
1735 if (tc->offset + tc->count > txq) {
1736 pr_warning("Number of in use tx queues "
1737 "changed. Priority %i to tc "
1738 "mapping %i is no longer valid "
1739 "setting map to 0\n",
1741 netdev_set_prio_tc_map(dev, i, 0);
1747 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1748 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1750 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1754 if (txq < 1 || txq > dev->num_tx_queues)
1757 if (dev->reg_state == NETREG_REGISTERED ||
1758 dev->reg_state == NETREG_UNREGISTERING) {
1761 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1767 netif_setup_tc(dev, txq);
1769 if (txq < dev->real_num_tx_queues)
1770 qdisc_reset_all_tx_gt(dev, txq);
1773 dev->real_num_tx_queues = txq;
1776 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1780 * netif_set_real_num_rx_queues - set actual number of RX queues used
1781 * @dev: Network device
1782 * @rxq: Actual number of RX queues
1784 * This must be called either with the rtnl_lock held or before
1785 * registration of the net device. Returns 0 on success, or a
1786 * negative error code. If called before registration, it always
1789 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1793 if (rxq < 1 || rxq > dev->num_rx_queues)
1796 if (dev->reg_state == NETREG_REGISTERED) {
1799 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1805 dev->real_num_rx_queues = rxq;
1808 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1811 static inline void __netif_reschedule(struct Qdisc *q)
1813 struct softnet_data *sd;
1814 unsigned long flags;
1816 local_irq_save(flags);
1817 sd = &__get_cpu_var(softnet_data);
1818 q->next_sched = NULL;
1819 *sd->output_queue_tailp = q;
1820 sd->output_queue_tailp = &q->next_sched;
1821 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1822 local_irq_restore(flags);
1825 void __netif_schedule(struct Qdisc *q)
1827 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1828 __netif_reschedule(q);
1830 EXPORT_SYMBOL(__netif_schedule);
1832 void dev_kfree_skb_irq(struct sk_buff *skb)
1834 if (atomic_dec_and_test(&skb->users)) {
1835 struct softnet_data *sd;
1836 unsigned long flags;
1838 local_irq_save(flags);
1839 sd = &__get_cpu_var(softnet_data);
1840 skb->next = sd->completion_queue;
1841 sd->completion_queue = skb;
1842 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1843 local_irq_restore(flags);
1846 EXPORT_SYMBOL(dev_kfree_skb_irq);
1848 void dev_kfree_skb_any(struct sk_buff *skb)
1850 if (in_irq() || irqs_disabled())
1851 dev_kfree_skb_irq(skb);
1855 EXPORT_SYMBOL(dev_kfree_skb_any);
1859 * netif_device_detach - mark device as removed
1860 * @dev: network device
1862 * Mark device as removed from system and therefore no longer available.
1864 void netif_device_detach(struct net_device *dev)
1866 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1867 netif_running(dev)) {
1868 netif_tx_stop_all_queues(dev);
1871 EXPORT_SYMBOL(netif_device_detach);
1874 * netif_device_attach - mark device as attached
1875 * @dev: network device
1877 * Mark device as attached from system and restart if needed.
1879 void netif_device_attach(struct net_device *dev)
1881 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1882 netif_running(dev)) {
1883 netif_tx_wake_all_queues(dev);
1884 __netdev_watchdog_up(dev);
1887 EXPORT_SYMBOL(netif_device_attach);
1890 * Invalidate hardware checksum when packet is to be mangled, and
1891 * complete checksum manually on outgoing path.
1893 int skb_checksum_help(struct sk_buff *skb)
1896 int ret = 0, offset;
1898 if (skb->ip_summed == CHECKSUM_COMPLETE)
1899 goto out_set_summed;
1901 if (unlikely(skb_shinfo(skb)->gso_size)) {
1902 /* Let GSO fix up the checksum. */
1903 goto out_set_summed;
1906 offset = skb_checksum_start_offset(skb);
1907 BUG_ON(offset >= skb_headlen(skb));
1908 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1910 offset += skb->csum_offset;
1911 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1913 if (skb_cloned(skb) &&
1914 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1915 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1920 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1922 skb->ip_summed = CHECKSUM_NONE;
1926 EXPORT_SYMBOL(skb_checksum_help);
1929 * skb_gso_segment - Perform segmentation on skb.
1930 * @skb: buffer to segment
1931 * @features: features for the output path (see dev->features)
1933 * This function segments the given skb and returns a list of segments.
1935 * It may return NULL if the skb requires no segmentation. This is
1936 * only possible when GSO is used for verifying header integrity.
1938 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1940 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1941 struct packet_type *ptype;
1942 __be16 type = skb->protocol;
1943 int vlan_depth = ETH_HLEN;
1946 while (type == htons(ETH_P_8021Q)) {
1947 struct vlan_hdr *vh;
1949 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1950 return ERR_PTR(-EINVAL);
1952 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1953 type = vh->h_vlan_encapsulated_proto;
1954 vlan_depth += VLAN_HLEN;
1957 skb_reset_mac_header(skb);
1958 skb->mac_len = skb->network_header - skb->mac_header;
1959 __skb_pull(skb, skb->mac_len);
1961 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1962 struct net_device *dev = skb->dev;
1963 struct ethtool_drvinfo info = {};
1965 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1966 dev->ethtool_ops->get_drvinfo(dev, &info);
1968 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1969 info.driver, dev ? dev->features : 0L,
1970 skb->sk ? skb->sk->sk_route_caps : 0L,
1971 skb->len, skb->data_len, skb->ip_summed);
1973 if (skb_header_cloned(skb) &&
1974 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1975 return ERR_PTR(err);
1979 list_for_each_entry_rcu(ptype,
1980 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1981 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1982 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1983 err = ptype->gso_send_check(skb);
1984 segs = ERR_PTR(err);
1985 if (err || skb_gso_ok(skb, features))
1987 __skb_push(skb, (skb->data -
1988 skb_network_header(skb)));
1990 segs = ptype->gso_segment(skb, features);
1996 __skb_push(skb, skb->data - skb_mac_header(skb));
2000 EXPORT_SYMBOL(skb_gso_segment);
2002 /* Take action when hardware reception checksum errors are detected. */
2004 void netdev_rx_csum_fault(struct net_device *dev)
2006 if (net_ratelimit()) {
2007 printk(KERN_ERR "%s: hw csum failure.\n",
2008 dev ? dev->name : "<unknown>");
2012 EXPORT_SYMBOL(netdev_rx_csum_fault);
2015 /* Actually, we should eliminate this check as soon as we know, that:
2016 * 1. IOMMU is present and allows to map all the memory.
2017 * 2. No high memory really exists on this machine.
2020 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2022 #ifdef CONFIG_HIGHMEM
2024 if (!(dev->features & NETIF_F_HIGHDMA)) {
2025 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2026 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2027 if (PageHighMem(skb_frag_page(frag)))
2032 if (PCI_DMA_BUS_IS_PHYS) {
2033 struct device *pdev = dev->dev.parent;
2037 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2038 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2039 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2040 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2049 void (*destructor)(struct sk_buff *skb);
2052 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2054 static void dev_gso_skb_destructor(struct sk_buff *skb)
2056 struct dev_gso_cb *cb;
2059 struct sk_buff *nskb = skb->next;
2061 skb->next = nskb->next;
2064 } while (skb->next);
2066 cb = DEV_GSO_CB(skb);
2068 cb->destructor(skb);
2072 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2073 * @skb: buffer to segment
2074 * @features: device features as applicable to this skb
2076 * This function segments the given skb and stores the list of segments
2079 static int dev_gso_segment(struct sk_buff *skb, int features)
2081 struct sk_buff *segs;
2083 segs = skb_gso_segment(skb, features);
2085 /* Verifying header integrity only. */
2090 return PTR_ERR(segs);
2093 DEV_GSO_CB(skb)->destructor = skb->destructor;
2094 skb->destructor = dev_gso_skb_destructor;
2099 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2101 return ((features & NETIF_F_GEN_CSUM) ||
2102 ((features & NETIF_F_V4_CSUM) &&
2103 protocol == htons(ETH_P_IP)) ||
2104 ((features & NETIF_F_V6_CSUM) &&
2105 protocol == htons(ETH_P_IPV6)) ||
2106 ((features & NETIF_F_FCOE_CRC) &&
2107 protocol == htons(ETH_P_FCOE)));
2110 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2112 if (skb->ip_summed != CHECKSUM_NONE &&
2113 !can_checksum_protocol(features, protocol)) {
2114 features &= ~NETIF_F_ALL_CSUM;
2115 features &= ~NETIF_F_SG;
2116 } else if (illegal_highdma(skb->dev, skb)) {
2117 features &= ~NETIF_F_SG;
2123 u32 netif_skb_features(struct sk_buff *skb)
2125 __be16 protocol = skb->protocol;
2126 u32 features = skb->dev->features;
2128 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2129 features &= ~NETIF_F_GSO_MASK;
2131 if (protocol == htons(ETH_P_8021Q)) {
2132 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2133 protocol = veh->h_vlan_encapsulated_proto;
2134 } else if (!vlan_tx_tag_present(skb)) {
2135 return harmonize_features(skb, protocol, features);
2138 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2140 if (protocol != htons(ETH_P_8021Q)) {
2141 return harmonize_features(skb, protocol, features);
2143 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2144 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2145 return harmonize_features(skb, protocol, features);
2148 EXPORT_SYMBOL(netif_skb_features);
2151 * Returns true if either:
2152 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2153 * 2. skb is fragmented and the device does not support SG, or if
2154 * at least one of fragments is in highmem and device does not
2155 * support DMA from it.
2157 static inline int skb_needs_linearize(struct sk_buff *skb,
2160 return skb_is_nonlinear(skb) &&
2161 ((skb_has_frag_list(skb) &&
2162 !(features & NETIF_F_FRAGLIST)) ||
2163 (skb_shinfo(skb)->nr_frags &&
2164 !(features & NETIF_F_SG)));
2167 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2168 struct netdev_queue *txq)
2170 const struct net_device_ops *ops = dev->netdev_ops;
2171 int rc = NETDEV_TX_OK;
2172 unsigned int skb_len;
2174 if (likely(!skb->next)) {
2178 * If device doesn't need skb->dst, release it right now while
2179 * its hot in this cpu cache
2181 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2184 if (!list_empty(&ptype_all))
2185 dev_queue_xmit_nit(skb, dev);
2187 features = netif_skb_features(skb);
2189 if (vlan_tx_tag_present(skb) &&
2190 !(features & NETIF_F_HW_VLAN_TX)) {
2191 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2198 if (netif_needs_gso(skb, features)) {
2199 if (unlikely(dev_gso_segment(skb, features)))
2204 if (skb_needs_linearize(skb, features) &&
2205 __skb_linearize(skb))
2208 /* If packet is not checksummed and device does not
2209 * support checksumming for this protocol, complete
2210 * checksumming here.
2212 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2213 skb_set_transport_header(skb,
2214 skb_checksum_start_offset(skb));
2215 if (!(features & NETIF_F_ALL_CSUM) &&
2216 skb_checksum_help(skb))
2222 rc = ops->ndo_start_xmit(skb, dev);
2223 trace_net_dev_xmit(skb, rc, dev, skb_len);
2224 if (rc == NETDEV_TX_OK)
2225 txq_trans_update(txq);
2231 struct sk_buff *nskb = skb->next;
2233 skb->next = nskb->next;
2237 * If device doesn't need nskb->dst, release it right now while
2238 * its hot in this cpu cache
2240 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2243 skb_len = nskb->len;
2244 rc = ops->ndo_start_xmit(nskb, dev);
2245 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2246 if (unlikely(rc != NETDEV_TX_OK)) {
2247 if (rc & ~NETDEV_TX_MASK)
2248 goto out_kfree_gso_skb;
2249 nskb->next = skb->next;
2253 txq_trans_update(txq);
2254 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2255 return NETDEV_TX_BUSY;
2256 } while (skb->next);
2259 if (likely(skb->next == NULL))
2260 skb->destructor = DEV_GSO_CB(skb)->destructor;
2267 static u32 hashrnd __read_mostly;
2270 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2271 * to be used as a distribution range.
2273 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2274 unsigned int num_tx_queues)
2278 u16 qcount = num_tx_queues;
2280 if (skb_rx_queue_recorded(skb)) {
2281 hash = skb_get_rx_queue(skb);
2282 while (unlikely(hash >= num_tx_queues))
2283 hash -= num_tx_queues;
2288 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2289 qoffset = dev->tc_to_txq[tc].offset;
2290 qcount = dev->tc_to_txq[tc].count;
2293 if (skb->sk && skb->sk->sk_hash)
2294 hash = skb->sk->sk_hash;
2296 hash = (__force u16) skb->protocol;
2297 hash = jhash_1word(hash, hashrnd);
2299 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2301 EXPORT_SYMBOL(__skb_tx_hash);
2303 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2305 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2306 if (net_ratelimit()) {
2307 pr_warning("%s selects TX queue %d, but "
2308 "real number of TX queues is %d\n",
2309 dev->name, queue_index, dev->real_num_tx_queues);
2316 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2319 struct xps_dev_maps *dev_maps;
2320 struct xps_map *map;
2321 int queue_index = -1;
2324 dev_maps = rcu_dereference(dev->xps_maps);
2326 map = rcu_dereference(
2327 dev_maps->cpu_map[raw_smp_processor_id()]);
2330 queue_index = map->queues[0];
2333 if (skb->sk && skb->sk->sk_hash)
2334 hash = skb->sk->sk_hash;
2336 hash = (__force u16) skb->protocol ^
2338 hash = jhash_1word(hash, hashrnd);
2339 queue_index = map->queues[
2340 ((u64)hash * map->len) >> 32];
2342 if (unlikely(queue_index >= dev->real_num_tx_queues))
2354 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2355 struct sk_buff *skb)
2358 const struct net_device_ops *ops = dev->netdev_ops;
2360 if (dev->real_num_tx_queues == 1)
2362 else if (ops->ndo_select_queue) {
2363 queue_index = ops->ndo_select_queue(dev, skb);
2364 queue_index = dev_cap_txqueue(dev, queue_index);
2366 struct sock *sk = skb->sk;
2367 queue_index = sk_tx_queue_get(sk);
2369 if (queue_index < 0 || skb->ooo_okay ||
2370 queue_index >= dev->real_num_tx_queues) {
2371 int old_index = queue_index;
2373 queue_index = get_xps_queue(dev, skb);
2374 if (queue_index < 0)
2375 queue_index = skb_tx_hash(dev, skb);
2377 if (queue_index != old_index && sk) {
2378 struct dst_entry *dst =
2379 rcu_dereference_check(sk->sk_dst_cache, 1);
2381 if (dst && skb_dst(skb) == dst)
2382 sk_tx_queue_set(sk, queue_index);
2387 skb_set_queue_mapping(skb, queue_index);
2388 return netdev_get_tx_queue(dev, queue_index);
2391 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2392 struct net_device *dev,
2393 struct netdev_queue *txq)
2395 spinlock_t *root_lock = qdisc_lock(q);
2399 qdisc_skb_cb(skb)->pkt_len = skb->len;
2400 qdisc_calculate_pkt_len(skb, q);
2402 * Heuristic to force contended enqueues to serialize on a
2403 * separate lock before trying to get qdisc main lock.
2404 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2405 * and dequeue packets faster.
2407 contended = qdisc_is_running(q);
2408 if (unlikely(contended))
2409 spin_lock(&q->busylock);
2411 spin_lock(root_lock);
2412 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2415 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2416 qdisc_run_begin(q)) {
2418 * This is a work-conserving queue; there are no old skbs
2419 * waiting to be sent out; and the qdisc is not running -
2420 * xmit the skb directly.
2422 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2425 qdisc_bstats_update(q, skb);
2427 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2428 if (unlikely(contended)) {
2429 spin_unlock(&q->busylock);
2436 rc = NET_XMIT_SUCCESS;
2439 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2440 if (qdisc_run_begin(q)) {
2441 if (unlikely(contended)) {
2442 spin_unlock(&q->busylock);
2448 spin_unlock(root_lock);
2449 if (unlikely(contended))
2450 spin_unlock(&q->busylock);
2454 static DEFINE_PER_CPU(int, xmit_recursion);
2455 #define RECURSION_LIMIT 10
2458 * dev_queue_xmit - transmit a buffer
2459 * @skb: buffer to transmit
2461 * Queue a buffer for transmission to a network device. The caller must
2462 * have set the device and priority and built the buffer before calling
2463 * this function. The function can be called from an interrupt.
2465 * A negative errno code is returned on a failure. A success does not
2466 * guarantee the frame will be transmitted as it may be dropped due
2467 * to congestion or traffic shaping.
2469 * -----------------------------------------------------------------------------------
2470 * I notice this method can also return errors from the queue disciplines,
2471 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2474 * Regardless of the return value, the skb is consumed, so it is currently
2475 * difficult to retry a send to this method. (You can bump the ref count
2476 * before sending to hold a reference for retry if you are careful.)
2478 * When calling this method, interrupts MUST be enabled. This is because
2479 * the BH enable code must have IRQs enabled so that it will not deadlock.
2482 int dev_queue_xmit(struct sk_buff *skb)
2484 struct net_device *dev = skb->dev;
2485 struct netdev_queue *txq;
2489 /* Disable soft irqs for various locks below. Also
2490 * stops preemption for RCU.
2494 txq = dev_pick_tx(dev, skb);
2495 q = rcu_dereference_bh(txq->qdisc);
2497 #ifdef CONFIG_NET_CLS_ACT
2498 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2500 trace_net_dev_queue(skb);
2502 rc = __dev_xmit_skb(skb, q, dev, txq);
2506 /* The device has no queue. Common case for software devices:
2507 loopback, all the sorts of tunnels...
2509 Really, it is unlikely that netif_tx_lock protection is necessary
2510 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2512 However, it is possible, that they rely on protection
2515 Check this and shot the lock. It is not prone from deadlocks.
2516 Either shot noqueue qdisc, it is even simpler 8)
2518 if (dev->flags & IFF_UP) {
2519 int cpu = smp_processor_id(); /* ok because BHs are off */
2521 if (txq->xmit_lock_owner != cpu) {
2523 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2524 goto recursion_alert;
2526 HARD_TX_LOCK(dev, txq, cpu);
2528 if (!netif_tx_queue_stopped(txq)) {
2529 __this_cpu_inc(xmit_recursion);
2530 rc = dev_hard_start_xmit(skb, dev, txq);
2531 __this_cpu_dec(xmit_recursion);
2532 if (dev_xmit_complete(rc)) {
2533 HARD_TX_UNLOCK(dev, txq);
2537 HARD_TX_UNLOCK(dev, txq);
2538 if (net_ratelimit())
2539 printk(KERN_CRIT "Virtual device %s asks to "
2540 "queue packet!\n", dev->name);
2542 /* Recursion is detected! It is possible,
2546 if (net_ratelimit())
2547 printk(KERN_CRIT "Dead loop on virtual device "
2548 "%s, fix it urgently!\n", dev->name);
2553 rcu_read_unlock_bh();
2558 rcu_read_unlock_bh();
2561 EXPORT_SYMBOL(dev_queue_xmit);
2564 /*=======================================================================
2566 =======================================================================*/
2568 int netdev_max_backlog __read_mostly = 1000;
2569 int netdev_tstamp_prequeue __read_mostly = 1;
2570 int netdev_budget __read_mostly = 300;
2571 int weight_p __read_mostly = 64; /* old backlog weight */
2573 /* Called with irq disabled */
2574 static inline void ____napi_schedule(struct softnet_data *sd,
2575 struct napi_struct *napi)
2577 list_add_tail(&napi->poll_list, &sd->poll_list);
2578 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2582 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2583 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2584 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2585 * if hash is a canonical 4-tuple hash over transport ports.
2587 void __skb_get_rxhash(struct sk_buff *skb)
2589 int nhoff, hash = 0, poff;
2590 const struct ipv6hdr *ip6;
2591 const struct iphdr *ip;
2592 const struct vlan_hdr *vlan;
2601 nhoff = skb_network_offset(skb);
2602 proto = skb->protocol;
2606 case __constant_htons(ETH_P_IP):
2608 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2611 ip = (const struct iphdr *) (skb->data + nhoff);
2614 if (ip_is_fragment(ip))
2617 ip_proto = ip->protocol;
2618 addr1 = (__force u32) ip->saddr;
2619 addr2 = (__force u32) ip->daddr;
2620 nhoff += ip->ihl * 4;
2622 case __constant_htons(ETH_P_IPV6):
2624 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2627 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2628 ip_proto = ip6->nexthdr;
2629 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2630 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2633 case __constant_htons(ETH_P_8021Q):
2634 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2636 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2637 proto = vlan->h_vlan_encapsulated_proto;
2638 nhoff += sizeof(*vlan);
2640 case __constant_htons(ETH_P_PPP_SES):
2641 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2643 proto = *((__be16 *) (skb->data + nhoff +
2644 sizeof(struct pppoe_hdr)));
2645 nhoff += PPPOE_SES_HLEN;
2647 case __constant_htons(PPP_IP):
2649 case __constant_htons(PPP_IPV6):
2660 if (pskb_may_pull(skb, nhoff + 16)) {
2661 u8 *h = skb->data + nhoff;
2662 __be16 flags = *(__be16 *)h;
2665 * Only look inside GRE if version zero and no
2668 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2669 proto = *(__be16 *)(h + 2);
2671 if (flags & GRE_CSUM)
2673 if (flags & GRE_KEY)
2675 if (flags & GRE_SEQ)
2688 poff = proto_ports_offset(ip_proto);
2691 if (pskb_may_pull(skb, nhoff + 4)) {
2692 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2697 /* get a consistent hash (same value on both flow directions) */
2698 if (addr2 < addr1 ||
2700 ports.v16[1] < ports.v16[0])) {
2702 swap(ports.v16[0], ports.v16[1]);
2704 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2711 EXPORT_SYMBOL(__skb_get_rxhash);
2715 /* One global table that all flow-based protocols share. */
2716 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2717 EXPORT_SYMBOL(rps_sock_flow_table);
2719 static struct rps_dev_flow *
2720 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2721 struct rps_dev_flow *rflow, u16 next_cpu)
2723 if (next_cpu != RPS_NO_CPU) {
2724 #ifdef CONFIG_RFS_ACCEL
2725 struct netdev_rx_queue *rxqueue;
2726 struct rps_dev_flow_table *flow_table;
2727 struct rps_dev_flow *old_rflow;
2732 /* Should we steer this flow to a different hardware queue? */
2733 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2734 !(dev->features & NETIF_F_NTUPLE))
2736 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2737 if (rxq_index == skb_get_rx_queue(skb))
2740 rxqueue = dev->_rx + rxq_index;
2741 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2744 flow_id = skb->rxhash & flow_table->mask;
2745 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2746 rxq_index, flow_id);
2750 rflow = &flow_table->flows[flow_id];
2752 if (old_rflow->filter == rflow->filter)
2753 old_rflow->filter = RPS_NO_FILTER;
2757 per_cpu(softnet_data, next_cpu).input_queue_head;
2760 rflow->cpu = next_cpu;
2765 * get_rps_cpu is called from netif_receive_skb and returns the target
2766 * CPU from the RPS map of the receiving queue for a given skb.
2767 * rcu_read_lock must be held on entry.
2769 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2770 struct rps_dev_flow **rflowp)
2772 struct netdev_rx_queue *rxqueue;
2773 struct rps_map *map;
2774 struct rps_dev_flow_table *flow_table;
2775 struct rps_sock_flow_table *sock_flow_table;
2779 if (skb_rx_queue_recorded(skb)) {
2780 u16 index = skb_get_rx_queue(skb);
2781 if (unlikely(index >= dev->real_num_rx_queues)) {
2782 WARN_ONCE(dev->real_num_rx_queues > 1,
2783 "%s received packet on queue %u, but number "
2784 "of RX queues is %u\n",
2785 dev->name, index, dev->real_num_rx_queues);
2788 rxqueue = dev->_rx + index;
2792 map = rcu_dereference(rxqueue->rps_map);
2794 if (map->len == 1 &&
2795 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2796 tcpu = map->cpus[0];
2797 if (cpu_online(tcpu))
2801 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2805 skb_reset_network_header(skb);
2806 if (!skb_get_rxhash(skb))
2809 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2810 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2811 if (flow_table && sock_flow_table) {
2813 struct rps_dev_flow *rflow;
2815 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2818 next_cpu = sock_flow_table->ents[skb->rxhash &
2819 sock_flow_table->mask];
2822 * If the desired CPU (where last recvmsg was done) is
2823 * different from current CPU (one in the rx-queue flow
2824 * table entry), switch if one of the following holds:
2825 * - Current CPU is unset (equal to RPS_NO_CPU).
2826 * - Current CPU is offline.
2827 * - The current CPU's queue tail has advanced beyond the
2828 * last packet that was enqueued using this table entry.
2829 * This guarantees that all previous packets for the flow
2830 * have been dequeued, thus preserving in order delivery.
2832 if (unlikely(tcpu != next_cpu) &&
2833 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2834 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2835 rflow->last_qtail)) >= 0)) {
2837 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2840 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2848 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2850 if (cpu_online(tcpu)) {
2860 #ifdef CONFIG_RFS_ACCEL
2863 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2864 * @dev: Device on which the filter was set
2865 * @rxq_index: RX queue index
2866 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2867 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2869 * Drivers that implement ndo_rx_flow_steer() should periodically call
2870 * this function for each installed filter and remove the filters for
2871 * which it returns %true.
2873 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2874 u32 flow_id, u16 filter_id)
2876 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2877 struct rps_dev_flow_table *flow_table;
2878 struct rps_dev_flow *rflow;
2883 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2884 if (flow_table && flow_id <= flow_table->mask) {
2885 rflow = &flow_table->flows[flow_id];
2886 cpu = ACCESS_ONCE(rflow->cpu);
2887 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2888 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2889 rflow->last_qtail) <
2890 (int)(10 * flow_table->mask)))
2896 EXPORT_SYMBOL(rps_may_expire_flow);
2898 #endif /* CONFIG_RFS_ACCEL */
2900 /* Called from hardirq (IPI) context */
2901 static void rps_trigger_softirq(void *data)
2903 struct softnet_data *sd = data;
2905 ____napi_schedule(sd, &sd->backlog);
2909 #endif /* CONFIG_RPS */
2912 * Check if this softnet_data structure is another cpu one
2913 * If yes, queue it to our IPI list and return 1
2916 static int rps_ipi_queued(struct softnet_data *sd)
2919 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2922 sd->rps_ipi_next = mysd->rps_ipi_list;
2923 mysd->rps_ipi_list = sd;
2925 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2928 #endif /* CONFIG_RPS */
2933 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2934 * queue (may be a remote CPU queue).
2936 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2937 unsigned int *qtail)
2939 struct softnet_data *sd;
2940 unsigned long flags;
2942 sd = &per_cpu(softnet_data, cpu);
2944 local_irq_save(flags);
2947 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2948 if (skb_queue_len(&sd->input_pkt_queue)) {
2950 __skb_queue_tail(&sd->input_pkt_queue, skb);
2951 input_queue_tail_incr_save(sd, qtail);
2953 local_irq_restore(flags);
2954 return NET_RX_SUCCESS;
2957 /* Schedule NAPI for backlog device
2958 * We can use non atomic operation since we own the queue lock
2960 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2961 if (!rps_ipi_queued(sd))
2962 ____napi_schedule(sd, &sd->backlog);
2970 local_irq_restore(flags);
2972 atomic_long_inc(&skb->dev->rx_dropped);
2978 * netif_rx - post buffer to the network code
2979 * @skb: buffer to post
2981 * This function receives a packet from a device driver and queues it for
2982 * the upper (protocol) levels to process. It always succeeds. The buffer
2983 * may be dropped during processing for congestion control or by the
2987 * NET_RX_SUCCESS (no congestion)
2988 * NET_RX_DROP (packet was dropped)
2992 int netif_rx(struct sk_buff *skb)
2996 /* if netpoll wants it, pretend we never saw it */
2997 if (netpoll_rx(skb))
3000 if (netdev_tstamp_prequeue)
3001 net_timestamp_check(skb);
3003 trace_netif_rx(skb);
3006 struct rps_dev_flow voidflow, *rflow = &voidflow;
3012 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3014 cpu = smp_processor_id();
3016 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3024 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3030 EXPORT_SYMBOL(netif_rx);
3032 int netif_rx_ni(struct sk_buff *skb)
3037 err = netif_rx(skb);
3038 if (local_softirq_pending())
3044 EXPORT_SYMBOL(netif_rx_ni);
3046 static void net_tx_action(struct softirq_action *h)
3048 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3050 if (sd->completion_queue) {
3051 struct sk_buff *clist;
3053 local_irq_disable();
3054 clist = sd->completion_queue;
3055 sd->completion_queue = NULL;
3059 struct sk_buff *skb = clist;
3060 clist = clist->next;
3062 WARN_ON(atomic_read(&skb->users));
3063 trace_kfree_skb(skb, net_tx_action);
3068 if (sd->output_queue) {
3071 local_irq_disable();
3072 head = sd->output_queue;
3073 sd->output_queue = NULL;
3074 sd->output_queue_tailp = &sd->output_queue;
3078 struct Qdisc *q = head;
3079 spinlock_t *root_lock;
3081 head = head->next_sched;
3083 root_lock = qdisc_lock(q);
3084 if (spin_trylock(root_lock)) {
3085 smp_mb__before_clear_bit();
3086 clear_bit(__QDISC_STATE_SCHED,
3089 spin_unlock(root_lock);
3091 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3093 __netif_reschedule(q);
3095 smp_mb__before_clear_bit();
3096 clear_bit(__QDISC_STATE_SCHED,
3104 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3105 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3106 /* This hook is defined here for ATM LANE */
3107 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3108 unsigned char *addr) __read_mostly;
3109 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3112 #ifdef CONFIG_NET_CLS_ACT
3113 /* TODO: Maybe we should just force sch_ingress to be compiled in
3114 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3115 * a compare and 2 stores extra right now if we dont have it on
3116 * but have CONFIG_NET_CLS_ACT
3117 * NOTE: This doesn't stop any functionality; if you dont have
3118 * the ingress scheduler, you just can't add policies on ingress.
3121 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3123 struct net_device *dev = skb->dev;
3124 u32 ttl = G_TC_RTTL(skb->tc_verd);
3125 int result = TC_ACT_OK;
3128 if (unlikely(MAX_RED_LOOP < ttl++)) {
3129 if (net_ratelimit())
3130 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3131 skb->skb_iif, dev->ifindex);
3135 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3136 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3139 if (q != &noop_qdisc) {
3140 spin_lock(qdisc_lock(q));
3141 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3142 result = qdisc_enqueue_root(skb, q);
3143 spin_unlock(qdisc_lock(q));
3149 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3150 struct packet_type **pt_prev,
3151 int *ret, struct net_device *orig_dev)
3153 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3155 if (!rxq || rxq->qdisc == &noop_qdisc)
3159 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3163 switch (ing_filter(skb, rxq)) {
3177 * netdev_rx_handler_register - register receive handler
3178 * @dev: device to register a handler for
3179 * @rx_handler: receive handler to register
3180 * @rx_handler_data: data pointer that is used by rx handler
3182 * Register a receive hander for a device. This handler will then be
3183 * called from __netif_receive_skb. A negative errno code is returned
3186 * The caller must hold the rtnl_mutex.
3188 * For a general description of rx_handler, see enum rx_handler_result.
3190 int netdev_rx_handler_register(struct net_device *dev,
3191 rx_handler_func_t *rx_handler,
3192 void *rx_handler_data)
3196 if (dev->rx_handler)
3199 /* Note: rx_handler_data must be set before rx_handler */
3200 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3201 rcu_assign_pointer(dev->rx_handler, rx_handler);
3205 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3208 * netdev_rx_handler_unregister - unregister receive handler
3209 * @dev: device to unregister a handler from
3211 * Unregister a receive hander from a device.
3213 * The caller must hold the rtnl_mutex.
3215 void netdev_rx_handler_unregister(struct net_device *dev)
3219 RCU_INIT_POINTER(dev->rx_handler, NULL);
3220 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3221 * section has a guarantee to see a non NULL rx_handler_data
3225 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3227 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3229 static int __netif_receive_skb(struct sk_buff *skb)
3231 struct packet_type *ptype, *pt_prev;
3232 rx_handler_func_t *rx_handler;
3233 struct net_device *orig_dev;
3234 struct net_device *null_or_dev;
3235 bool deliver_exact = false;
3236 int ret = NET_RX_DROP;
3239 if (!netdev_tstamp_prequeue)
3240 net_timestamp_check(skb);
3242 trace_netif_receive_skb(skb);
3244 /* if we've gotten here through NAPI, check netpoll */
3245 if (netpoll_receive_skb(skb))
3249 skb->skb_iif = skb->dev->ifindex;
3250 orig_dev = skb->dev;
3252 skb_reset_network_header(skb);
3253 skb_reset_transport_header(skb);
3254 skb_reset_mac_len(skb);
3262 __this_cpu_inc(softnet_data.processed);
3264 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3265 skb = vlan_untag(skb);
3270 #ifdef CONFIG_NET_CLS_ACT
3271 if (skb->tc_verd & TC_NCLS) {
3272 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3277 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3278 if (!ptype->dev || ptype->dev == skb->dev) {
3280 ret = deliver_skb(skb, pt_prev, orig_dev);
3285 #ifdef CONFIG_NET_CLS_ACT
3286 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3292 if (vlan_tx_tag_present(skb)) {
3294 ret = deliver_skb(skb, pt_prev, orig_dev);
3297 if (vlan_do_receive(&skb))
3299 else if (unlikely(!skb))
3303 rx_handler = rcu_dereference(skb->dev->rx_handler);
3306 ret = deliver_skb(skb, pt_prev, orig_dev);
3309 switch (rx_handler(&skb)) {
3310 case RX_HANDLER_CONSUMED:
3311 ret = NET_RX_SUCCESS;
3313 case RX_HANDLER_ANOTHER:
3315 case RX_HANDLER_EXACT:
3316 deliver_exact = true;
3317 case RX_HANDLER_PASS:
3324 if (vlan_tx_nonzero_tag_present(skb))
3325 skb->pkt_type = PACKET_OTHERHOST;
3327 /* deliver only exact match when indicated */
3328 null_or_dev = deliver_exact ? skb->dev : NULL;
3330 type = skb->protocol;
3331 list_for_each_entry_rcu(ptype,
3332 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3333 if (ptype->type == type &&
3334 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3335 ptype->dev == orig_dev)) {
3337 ret = deliver_skb(skb, pt_prev, orig_dev);
3343 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3345 atomic_long_inc(&skb->dev->rx_dropped);
3347 /* Jamal, now you will not able to escape explaining
3348 * me how you were going to use this. :-)
3359 * netif_receive_skb - process receive buffer from network
3360 * @skb: buffer to process
3362 * netif_receive_skb() is the main receive data processing function.
3363 * It always succeeds. The buffer may be dropped during processing
3364 * for congestion control or by the protocol layers.
3366 * This function may only be called from softirq context and interrupts
3367 * should be enabled.
3369 * Return values (usually ignored):
3370 * NET_RX_SUCCESS: no congestion
3371 * NET_RX_DROP: packet was dropped
3373 int netif_receive_skb(struct sk_buff *skb)
3375 if (netdev_tstamp_prequeue)
3376 net_timestamp_check(skb);
3378 if (skb_defer_rx_timestamp(skb))
3379 return NET_RX_SUCCESS;
3383 struct rps_dev_flow voidflow, *rflow = &voidflow;
3388 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3391 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3395 ret = __netif_receive_skb(skb);
3401 return __netif_receive_skb(skb);
3404 EXPORT_SYMBOL(netif_receive_skb);
3406 /* Network device is going away, flush any packets still pending
3407 * Called with irqs disabled.
3409 static void flush_backlog(void *arg)
3411 struct net_device *dev = arg;
3412 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3413 struct sk_buff *skb, *tmp;
3416 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3417 if (skb->dev == dev) {
3418 __skb_unlink(skb, &sd->input_pkt_queue);
3420 input_queue_head_incr(sd);
3425 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3426 if (skb->dev == dev) {
3427 __skb_unlink(skb, &sd->process_queue);
3429 input_queue_head_incr(sd);
3434 static int napi_gro_complete(struct sk_buff *skb)
3436 struct packet_type *ptype;
3437 __be16 type = skb->protocol;
3438 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3441 if (NAPI_GRO_CB(skb)->count == 1) {
3442 skb_shinfo(skb)->gso_size = 0;
3447 list_for_each_entry_rcu(ptype, head, list) {
3448 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3451 err = ptype->gro_complete(skb);
3457 WARN_ON(&ptype->list == head);
3459 return NET_RX_SUCCESS;
3463 return netif_receive_skb(skb);
3466 inline void napi_gro_flush(struct napi_struct *napi)
3468 struct sk_buff *skb, *next;
3470 for (skb = napi->gro_list; skb; skb = next) {
3473 napi_gro_complete(skb);
3476 napi->gro_count = 0;
3477 napi->gro_list = NULL;
3479 EXPORT_SYMBOL(napi_gro_flush);
3481 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3483 struct sk_buff **pp = NULL;
3484 struct packet_type *ptype;
3485 __be16 type = skb->protocol;
3486 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3489 enum gro_result ret;
3491 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3494 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3498 list_for_each_entry_rcu(ptype, head, list) {
3499 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3502 skb_set_network_header(skb, skb_gro_offset(skb));
3503 mac_len = skb->network_header - skb->mac_header;
3504 skb->mac_len = mac_len;
3505 NAPI_GRO_CB(skb)->same_flow = 0;
3506 NAPI_GRO_CB(skb)->flush = 0;
3507 NAPI_GRO_CB(skb)->free = 0;
3509 pp = ptype->gro_receive(&napi->gro_list, skb);
3514 if (&ptype->list == head)
3517 same_flow = NAPI_GRO_CB(skb)->same_flow;
3518 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3521 struct sk_buff *nskb = *pp;
3525 napi_gro_complete(nskb);
3532 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3536 NAPI_GRO_CB(skb)->count = 1;
3537 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3538 skb->next = napi->gro_list;
3539 napi->gro_list = skb;
3543 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3544 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3546 BUG_ON(skb->end - skb->tail < grow);
3548 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3551 skb->data_len -= grow;
3553 skb_shinfo(skb)->frags[0].page_offset += grow;
3554 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3556 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3557 skb_frag_unref(skb, 0);
3558 memmove(skb_shinfo(skb)->frags,
3559 skb_shinfo(skb)->frags + 1,
3560 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3571 EXPORT_SYMBOL(dev_gro_receive);
3573 static inline gro_result_t
3574 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3577 unsigned int maclen = skb->dev->hard_header_len;
3579 for (p = napi->gro_list; p; p = p->next) {
3580 unsigned long diffs;
3582 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3583 diffs |= p->vlan_tci ^ skb->vlan_tci;
3584 if (maclen == ETH_HLEN)
3585 diffs |= compare_ether_header(skb_mac_header(p),
3586 skb_gro_mac_header(skb));
3588 diffs = memcmp(skb_mac_header(p),
3589 skb_gro_mac_header(skb),
3591 NAPI_GRO_CB(p)->same_flow = !diffs;
3592 NAPI_GRO_CB(p)->flush = 0;
3595 return dev_gro_receive(napi, skb);
3598 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3602 if (netif_receive_skb(skb))
3607 case GRO_MERGED_FREE:
3618 EXPORT_SYMBOL(napi_skb_finish);
3620 void skb_gro_reset_offset(struct sk_buff *skb)
3622 NAPI_GRO_CB(skb)->data_offset = 0;
3623 NAPI_GRO_CB(skb)->frag0 = NULL;
3624 NAPI_GRO_CB(skb)->frag0_len = 0;
3626 if (skb->mac_header == skb->tail &&
3627 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3628 NAPI_GRO_CB(skb)->frag0 =
3629 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3630 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3633 EXPORT_SYMBOL(skb_gro_reset_offset);
3635 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3637 skb_gro_reset_offset(skb);
3639 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3641 EXPORT_SYMBOL(napi_gro_receive);
3643 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3645 __skb_pull(skb, skb_headlen(skb));
3646 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3647 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3649 skb->dev = napi->dev;
3655 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3657 struct sk_buff *skb = napi->skb;
3660 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3666 EXPORT_SYMBOL(napi_get_frags);
3668 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3674 skb->protocol = eth_type_trans(skb, skb->dev);
3676 if (ret == GRO_HELD)
3677 skb_gro_pull(skb, -ETH_HLEN);
3678 else if (netif_receive_skb(skb))
3683 case GRO_MERGED_FREE:
3684 napi_reuse_skb(napi, skb);
3693 EXPORT_SYMBOL(napi_frags_finish);
3695 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3697 struct sk_buff *skb = napi->skb;
3704 skb_reset_mac_header(skb);
3705 skb_gro_reset_offset(skb);
3707 off = skb_gro_offset(skb);
3708 hlen = off + sizeof(*eth);
3709 eth = skb_gro_header_fast(skb, off);
3710 if (skb_gro_header_hard(skb, hlen)) {
3711 eth = skb_gro_header_slow(skb, hlen, off);
3712 if (unlikely(!eth)) {
3713 napi_reuse_skb(napi, skb);
3719 skb_gro_pull(skb, sizeof(*eth));
3722 * This works because the only protocols we care about don't require
3723 * special handling. We'll fix it up properly at the end.
3725 skb->protocol = eth->h_proto;
3730 EXPORT_SYMBOL(napi_frags_skb);
3732 gro_result_t napi_gro_frags(struct napi_struct *napi)
3734 struct sk_buff *skb = napi_frags_skb(napi);
3739 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3741 EXPORT_SYMBOL(napi_gro_frags);
3744 * net_rps_action sends any pending IPI's for rps.
3745 * Note: called with local irq disabled, but exits with local irq enabled.
3747 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3750 struct softnet_data *remsd = sd->rps_ipi_list;
3753 sd->rps_ipi_list = NULL;
3757 /* Send pending IPI's to kick RPS processing on remote cpus. */
3759 struct softnet_data *next = remsd->rps_ipi_next;
3761 if (cpu_online(remsd->cpu))
3762 __smp_call_function_single(remsd->cpu,
3771 static int process_backlog(struct napi_struct *napi, int quota)
3774 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3777 /* Check if we have pending ipi, its better to send them now,
3778 * not waiting net_rx_action() end.
3780 if (sd->rps_ipi_list) {
3781 local_irq_disable();
3782 net_rps_action_and_irq_enable(sd);
3785 napi->weight = weight_p;
3786 local_irq_disable();
3787 while (work < quota) {
3788 struct sk_buff *skb;
3791 while ((skb = __skb_dequeue(&sd->process_queue))) {
3793 __netif_receive_skb(skb);
3794 local_irq_disable();
3795 input_queue_head_incr(sd);
3796 if (++work >= quota) {
3803 qlen = skb_queue_len(&sd->input_pkt_queue);
3805 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3806 &sd->process_queue);
3808 if (qlen < quota - work) {
3810 * Inline a custom version of __napi_complete().
3811 * only current cpu owns and manipulates this napi,
3812 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3813 * we can use a plain write instead of clear_bit(),
3814 * and we dont need an smp_mb() memory barrier.
3816 list_del(&napi->poll_list);
3819 quota = work + qlen;
3829 * __napi_schedule - schedule for receive
3830 * @n: entry to schedule
3832 * The entry's receive function will be scheduled to run
3834 void __napi_schedule(struct napi_struct *n)
3836 unsigned long flags;
3838 local_irq_save(flags);
3839 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3840 local_irq_restore(flags);
3842 EXPORT_SYMBOL(__napi_schedule);
3844 void __napi_complete(struct napi_struct *n)
3846 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3847 BUG_ON(n->gro_list);
3849 list_del(&n->poll_list);
3850 smp_mb__before_clear_bit();
3851 clear_bit(NAPI_STATE_SCHED, &n->state);
3853 EXPORT_SYMBOL(__napi_complete);
3855 void napi_complete(struct napi_struct *n)
3857 unsigned long flags;
3860 * don't let napi dequeue from the cpu poll list
3861 * just in case its running on a different cpu
3863 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3867 local_irq_save(flags);
3869 local_irq_restore(flags);
3871 EXPORT_SYMBOL(napi_complete);
3873 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3874 int (*poll)(struct napi_struct *, int), int weight)
3876 INIT_LIST_HEAD(&napi->poll_list);
3877 napi->gro_count = 0;
3878 napi->gro_list = NULL;
3881 napi->weight = weight;
3882 list_add(&napi->dev_list, &dev->napi_list);
3884 #ifdef CONFIG_NETPOLL
3885 spin_lock_init(&napi->poll_lock);
3886 napi->poll_owner = -1;
3888 set_bit(NAPI_STATE_SCHED, &napi->state);
3890 EXPORT_SYMBOL(netif_napi_add);
3892 void netif_napi_del(struct napi_struct *napi)
3894 struct sk_buff *skb, *next;
3896 list_del_init(&napi->dev_list);
3897 napi_free_frags(napi);
3899 for (skb = napi->gro_list; skb; skb = next) {
3905 napi->gro_list = NULL;
3906 napi->gro_count = 0;
3908 EXPORT_SYMBOL(netif_napi_del);
3910 static void net_rx_action(struct softirq_action *h)
3912 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3913 unsigned long time_limit = jiffies + 2;
3914 int budget = netdev_budget;
3917 local_irq_disable();
3919 while (!list_empty(&sd->poll_list)) {
3920 struct napi_struct *n;
3923 /* If softirq window is exhuasted then punt.
3924 * Allow this to run for 2 jiffies since which will allow
3925 * an average latency of 1.5/HZ.
3927 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3932 /* Even though interrupts have been re-enabled, this
3933 * access is safe because interrupts can only add new
3934 * entries to the tail of this list, and only ->poll()
3935 * calls can remove this head entry from the list.
3937 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3939 have = netpoll_poll_lock(n);
3943 /* This NAPI_STATE_SCHED test is for avoiding a race
3944 * with netpoll's poll_napi(). Only the entity which
3945 * obtains the lock and sees NAPI_STATE_SCHED set will
3946 * actually make the ->poll() call. Therefore we avoid
3947 * accidentally calling ->poll() when NAPI is not scheduled.
3950 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3951 work = n->poll(n, weight);
3955 WARN_ON_ONCE(work > weight);
3959 local_irq_disable();
3961 /* Drivers must not modify the NAPI state if they
3962 * consume the entire weight. In such cases this code
3963 * still "owns" the NAPI instance and therefore can
3964 * move the instance around on the list at-will.
3966 if (unlikely(work == weight)) {
3967 if (unlikely(napi_disable_pending(n))) {
3970 local_irq_disable();
3972 list_move_tail(&n->poll_list, &sd->poll_list);
3975 netpoll_poll_unlock(have);
3978 net_rps_action_and_irq_enable(sd);
3980 #ifdef CONFIG_NET_DMA
3982 * There may not be any more sk_buffs coming right now, so push
3983 * any pending DMA copies to hardware
3985 dma_issue_pending_all();
3992 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3996 static gifconf_func_t *gifconf_list[NPROTO];
3999 * register_gifconf - register a SIOCGIF handler
4000 * @family: Address family
4001 * @gifconf: Function handler
4003 * Register protocol dependent address dumping routines. The handler
4004 * that is passed must not be freed or reused until it has been replaced
4005 * by another handler.
4007 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
4009 if (family >= NPROTO)
4011 gifconf_list[family] = gifconf;
4014 EXPORT_SYMBOL(register_gifconf);
4018 * Map an interface index to its name (SIOCGIFNAME)
4022 * We need this ioctl for efficient implementation of the
4023 * if_indextoname() function required by the IPv6 API. Without
4024 * it, we would have to search all the interfaces to find a
4028 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4030 struct net_device *dev;
4034 * Fetch the caller's info block.
4037 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4041 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4047 strcpy(ifr.ifr_name, dev->name);
4050 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4056 * Perform a SIOCGIFCONF call. This structure will change
4057 * size eventually, and there is nothing I can do about it.
4058 * Thus we will need a 'compatibility mode'.
4061 static int dev_ifconf(struct net *net, char __user *arg)
4064 struct net_device *dev;
4071 * Fetch the caller's info block.
4074 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4081 * Loop over the interfaces, and write an info block for each.
4085 for_each_netdev(net, dev) {
4086 for (i = 0; i < NPROTO; i++) {
4087 if (gifconf_list[i]) {
4090 done = gifconf_list[i](dev, NULL, 0);
4092 done = gifconf_list[i](dev, pos + total,
4102 * All done. Write the updated control block back to the caller.
4104 ifc.ifc_len = total;
4107 * Both BSD and Solaris return 0 here, so we do too.
4109 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4112 #ifdef CONFIG_PROC_FS
4114 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4116 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4117 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4118 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4120 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4122 struct net *net = seq_file_net(seq);
4123 struct net_device *dev;
4124 struct hlist_node *p;
4125 struct hlist_head *h;
4126 unsigned int count = 0, offset = get_offset(*pos);
4128 h = &net->dev_name_head[get_bucket(*pos)];
4129 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4130 if (++count == offset)
4137 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4139 struct net_device *dev;
4140 unsigned int bucket;
4143 dev = dev_from_same_bucket(seq, pos);
4147 bucket = get_bucket(*pos) + 1;
4148 *pos = set_bucket_offset(bucket, 1);
4149 } while (bucket < NETDEV_HASHENTRIES);
4155 * This is invoked by the /proc filesystem handler to display a device
4158 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4163 return SEQ_START_TOKEN;
4165 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4168 return dev_from_bucket(seq, pos);
4171 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4174 return dev_from_bucket(seq, pos);
4177 void dev_seq_stop(struct seq_file *seq, void *v)
4183 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4185 struct rtnl_link_stats64 temp;
4186 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4188 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4189 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4190 dev->name, stats->rx_bytes, stats->rx_packets,
4192 stats->rx_dropped + stats->rx_missed_errors,
4193 stats->rx_fifo_errors,
4194 stats->rx_length_errors + stats->rx_over_errors +
4195 stats->rx_crc_errors + stats->rx_frame_errors,
4196 stats->rx_compressed, stats->multicast,
4197 stats->tx_bytes, stats->tx_packets,
4198 stats->tx_errors, stats->tx_dropped,
4199 stats->tx_fifo_errors, stats->collisions,
4200 stats->tx_carrier_errors +
4201 stats->tx_aborted_errors +
4202 stats->tx_window_errors +
4203 stats->tx_heartbeat_errors,
4204 stats->tx_compressed);
4208 * Called from the PROCfs module. This now uses the new arbitrary sized
4209 * /proc/net interface to create /proc/net/dev
4211 static int dev_seq_show(struct seq_file *seq, void *v)
4213 if (v == SEQ_START_TOKEN)
4214 seq_puts(seq, "Inter-| Receive "
4216 " face |bytes packets errs drop fifo frame "
4217 "compressed multicast|bytes packets errs "
4218 "drop fifo colls carrier compressed\n");
4220 dev_seq_printf_stats(seq, v);
4224 static struct softnet_data *softnet_get_online(loff_t *pos)
4226 struct softnet_data *sd = NULL;
4228 while (*pos < nr_cpu_ids)
4229 if (cpu_online(*pos)) {
4230 sd = &per_cpu(softnet_data, *pos);
4237 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4239 return softnet_get_online(pos);
4242 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4245 return softnet_get_online(pos);
4248 static void softnet_seq_stop(struct seq_file *seq, void *v)
4252 static int softnet_seq_show(struct seq_file *seq, void *v)
4254 struct softnet_data *sd = v;
4256 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4257 sd->processed, sd->dropped, sd->time_squeeze, 0,
4258 0, 0, 0, 0, /* was fastroute */
4259 sd->cpu_collision, sd->received_rps);
4263 static const struct seq_operations dev_seq_ops = {
4264 .start = dev_seq_start,
4265 .next = dev_seq_next,
4266 .stop = dev_seq_stop,
4267 .show = dev_seq_show,
4270 static int dev_seq_open(struct inode *inode, struct file *file)
4272 return seq_open_net(inode, file, &dev_seq_ops,
4273 sizeof(struct seq_net_private));
4276 static const struct file_operations dev_seq_fops = {
4277 .owner = THIS_MODULE,
4278 .open = dev_seq_open,
4280 .llseek = seq_lseek,
4281 .release = seq_release_net,
4284 static const struct seq_operations softnet_seq_ops = {
4285 .start = softnet_seq_start,
4286 .next = softnet_seq_next,
4287 .stop = softnet_seq_stop,
4288 .show = softnet_seq_show,
4291 static int softnet_seq_open(struct inode *inode, struct file *file)
4293 return seq_open(file, &softnet_seq_ops);
4296 static const struct file_operations softnet_seq_fops = {
4297 .owner = THIS_MODULE,
4298 .open = softnet_seq_open,
4300 .llseek = seq_lseek,
4301 .release = seq_release,
4304 static void *ptype_get_idx(loff_t pos)
4306 struct packet_type *pt = NULL;
4310 list_for_each_entry_rcu(pt, &ptype_all, list) {
4316 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4317 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4326 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4330 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4333 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4335 struct packet_type *pt;
4336 struct list_head *nxt;
4340 if (v == SEQ_START_TOKEN)
4341 return ptype_get_idx(0);
4344 nxt = pt->list.next;
4345 if (pt->type == htons(ETH_P_ALL)) {
4346 if (nxt != &ptype_all)
4349 nxt = ptype_base[0].next;
4351 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4353 while (nxt == &ptype_base[hash]) {
4354 if (++hash >= PTYPE_HASH_SIZE)
4356 nxt = ptype_base[hash].next;
4359 return list_entry(nxt, struct packet_type, list);
4362 static void ptype_seq_stop(struct seq_file *seq, void *v)
4368 static int ptype_seq_show(struct seq_file *seq, void *v)
4370 struct packet_type *pt = v;
4372 if (v == SEQ_START_TOKEN)
4373 seq_puts(seq, "Type Device Function\n");
4374 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4375 if (pt->type == htons(ETH_P_ALL))
4376 seq_puts(seq, "ALL ");
4378 seq_printf(seq, "%04x", ntohs(pt->type));
4380 seq_printf(seq, " %-8s %pF\n",
4381 pt->dev ? pt->dev->name : "", pt->func);
4387 static const struct seq_operations ptype_seq_ops = {
4388 .start = ptype_seq_start,
4389 .next = ptype_seq_next,
4390 .stop = ptype_seq_stop,
4391 .show = ptype_seq_show,
4394 static int ptype_seq_open(struct inode *inode, struct file *file)
4396 return seq_open_net(inode, file, &ptype_seq_ops,
4397 sizeof(struct seq_net_private));
4400 static const struct file_operations ptype_seq_fops = {
4401 .owner = THIS_MODULE,
4402 .open = ptype_seq_open,
4404 .llseek = seq_lseek,
4405 .release = seq_release_net,
4409 static int __net_init dev_proc_net_init(struct net *net)
4413 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4415 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4417 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4420 if (wext_proc_init(net))
4426 proc_net_remove(net, "ptype");
4428 proc_net_remove(net, "softnet_stat");
4430 proc_net_remove(net, "dev");
4434 static void __net_exit dev_proc_net_exit(struct net *net)
4436 wext_proc_exit(net);
4438 proc_net_remove(net, "ptype");
4439 proc_net_remove(net, "softnet_stat");
4440 proc_net_remove(net, "dev");
4443 static struct pernet_operations __net_initdata dev_proc_ops = {
4444 .init = dev_proc_net_init,
4445 .exit = dev_proc_net_exit,
4448 static int __init dev_proc_init(void)
4450 return register_pernet_subsys(&dev_proc_ops);
4453 #define dev_proc_init() 0
4454 #endif /* CONFIG_PROC_FS */
4458 * netdev_set_master - set up master pointer
4459 * @slave: slave device
4460 * @master: new master device
4462 * Changes the master device of the slave. Pass %NULL to break the
4463 * bonding. The caller must hold the RTNL semaphore. On a failure
4464 * a negative errno code is returned. On success the reference counts
4465 * are adjusted and the function returns zero.
4467 int netdev_set_master(struct net_device *slave, struct net_device *master)
4469 struct net_device *old = slave->master;
4479 slave->master = master;
4485 EXPORT_SYMBOL(netdev_set_master);
4488 * netdev_set_bond_master - set up bonding master/slave pair
4489 * @slave: slave device
4490 * @master: new master device
4492 * Changes the master device of the slave. Pass %NULL to break the
4493 * bonding. The caller must hold the RTNL semaphore. On a failure
4494 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4495 * to the routing socket and the function returns zero.
4497 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4503 err = netdev_set_master(slave, master);
4507 slave->flags |= IFF_SLAVE;
4509 slave->flags &= ~IFF_SLAVE;
4511 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4514 EXPORT_SYMBOL(netdev_set_bond_master);
4516 static void dev_change_rx_flags(struct net_device *dev, int flags)
4518 const struct net_device_ops *ops = dev->netdev_ops;
4520 if (ops->ndo_change_rx_flags)
4521 ops->ndo_change_rx_flags(dev, flags);
4524 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4526 unsigned short old_flags = dev->flags;
4532 dev->flags |= IFF_PROMISC;
4533 dev->promiscuity += inc;
4534 if (dev->promiscuity == 0) {
4537 * If inc causes overflow, untouch promisc and return error.
4540 dev->flags &= ~IFF_PROMISC;
4542 dev->promiscuity -= inc;
4543 printk(KERN_WARNING "%s: promiscuity touches roof, "
4544 "set promiscuity failed, promiscuity feature "
4545 "of device might be broken.\n", dev->name);
4549 if (dev->flags != old_flags) {
4550 printk(KERN_INFO "device %s %s promiscuous mode\n",
4551 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4553 if (audit_enabled) {
4554 current_uid_gid(&uid, &gid);
4555 audit_log(current->audit_context, GFP_ATOMIC,
4556 AUDIT_ANOM_PROMISCUOUS,
4557 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4558 dev->name, (dev->flags & IFF_PROMISC),
4559 (old_flags & IFF_PROMISC),
4560 audit_get_loginuid(current),
4562 audit_get_sessionid(current));
4565 dev_change_rx_flags(dev, IFF_PROMISC);
4571 * dev_set_promiscuity - update promiscuity count on a device
4575 * Add or remove promiscuity from a device. While the count in the device
4576 * remains above zero the interface remains promiscuous. Once it hits zero
4577 * the device reverts back to normal filtering operation. A negative inc
4578 * value is used to drop promiscuity on the device.
4579 * Return 0 if successful or a negative errno code on error.
4581 int dev_set_promiscuity(struct net_device *dev, int inc)
4583 unsigned short old_flags = dev->flags;
4586 err = __dev_set_promiscuity(dev, inc);
4589 if (dev->flags != old_flags)
4590 dev_set_rx_mode(dev);
4593 EXPORT_SYMBOL(dev_set_promiscuity);
4596 * dev_set_allmulti - update allmulti count on a device
4600 * Add or remove reception of all multicast frames to a device. While the
4601 * count in the device remains above zero the interface remains listening
4602 * to all interfaces. Once it hits zero the device reverts back to normal
4603 * filtering operation. A negative @inc value is used to drop the counter
4604 * when releasing a resource needing all multicasts.
4605 * Return 0 if successful or a negative errno code on error.
4608 int dev_set_allmulti(struct net_device *dev, int inc)
4610 unsigned short old_flags = dev->flags;
4614 dev->flags |= IFF_ALLMULTI;
4615 dev->allmulti += inc;
4616 if (dev->allmulti == 0) {
4619 * If inc causes overflow, untouch allmulti and return error.
4622 dev->flags &= ~IFF_ALLMULTI;
4624 dev->allmulti -= inc;
4625 printk(KERN_WARNING "%s: allmulti touches roof, "
4626 "set allmulti failed, allmulti feature of "
4627 "device might be broken.\n", dev->name);
4631 if (dev->flags ^ old_flags) {
4632 dev_change_rx_flags(dev, IFF_ALLMULTI);
4633 dev_set_rx_mode(dev);
4637 EXPORT_SYMBOL(dev_set_allmulti);
4640 * Upload unicast and multicast address lists to device and
4641 * configure RX filtering. When the device doesn't support unicast
4642 * filtering it is put in promiscuous mode while unicast addresses
4645 void __dev_set_rx_mode(struct net_device *dev)
4647 const struct net_device_ops *ops = dev->netdev_ops;
4649 /* dev_open will call this function so the list will stay sane. */
4650 if (!(dev->flags&IFF_UP))
4653 if (!netif_device_present(dev))
4656 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4657 /* Unicast addresses changes may only happen under the rtnl,
4658 * therefore calling __dev_set_promiscuity here is safe.
4660 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4661 __dev_set_promiscuity(dev, 1);
4662 dev->uc_promisc = true;
4663 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4664 __dev_set_promiscuity(dev, -1);
4665 dev->uc_promisc = false;
4669 if (ops->ndo_set_rx_mode)
4670 ops->ndo_set_rx_mode(dev);
4673 void dev_set_rx_mode(struct net_device *dev)
4675 netif_addr_lock_bh(dev);
4676 __dev_set_rx_mode(dev);
4677 netif_addr_unlock_bh(dev);
4681 * dev_get_flags - get flags reported to userspace
4684 * Get the combination of flag bits exported through APIs to userspace.
4686 unsigned dev_get_flags(const struct net_device *dev)
4690 flags = (dev->flags & ~(IFF_PROMISC |
4695 (dev->gflags & (IFF_PROMISC |
4698 if (netif_running(dev)) {
4699 if (netif_oper_up(dev))
4700 flags |= IFF_RUNNING;
4701 if (netif_carrier_ok(dev))
4702 flags |= IFF_LOWER_UP;
4703 if (netif_dormant(dev))
4704 flags |= IFF_DORMANT;
4709 EXPORT_SYMBOL(dev_get_flags);
4711 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4713 int old_flags = dev->flags;
4719 * Set the flags on our device.
4722 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4723 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4725 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4729 * Load in the correct multicast list now the flags have changed.
4732 if ((old_flags ^ flags) & IFF_MULTICAST)
4733 dev_change_rx_flags(dev, IFF_MULTICAST);
4735 dev_set_rx_mode(dev);
4738 * Have we downed the interface. We handle IFF_UP ourselves
4739 * according to user attempts to set it, rather than blindly
4744 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4745 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4748 dev_set_rx_mode(dev);
4751 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4752 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4754 dev->gflags ^= IFF_PROMISC;
4755 dev_set_promiscuity(dev, inc);
4758 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4759 is important. Some (broken) drivers set IFF_PROMISC, when
4760 IFF_ALLMULTI is requested not asking us and not reporting.
4762 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4763 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4765 dev->gflags ^= IFF_ALLMULTI;
4766 dev_set_allmulti(dev, inc);
4772 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4774 unsigned int changes = dev->flags ^ old_flags;
4776 if (changes & IFF_UP) {
4777 if (dev->flags & IFF_UP)
4778 call_netdevice_notifiers(NETDEV_UP, dev);
4780 call_netdevice_notifiers(NETDEV_DOWN, dev);
4783 if (dev->flags & IFF_UP &&
4784 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4785 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4789 * dev_change_flags - change device settings
4791 * @flags: device state flags
4793 * Change settings on device based state flags. The flags are
4794 * in the userspace exported format.
4796 int dev_change_flags(struct net_device *dev, unsigned flags)
4799 int old_flags = dev->flags;
4801 ret = __dev_change_flags(dev, flags);
4805 changes = old_flags ^ dev->flags;
4807 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4809 __dev_notify_flags(dev, old_flags);
4812 EXPORT_SYMBOL(dev_change_flags);
4815 * dev_set_mtu - Change maximum transfer unit
4817 * @new_mtu: new transfer unit
4819 * Change the maximum transfer size of the network device.
4821 int dev_set_mtu(struct net_device *dev, int new_mtu)
4823 const struct net_device_ops *ops = dev->netdev_ops;
4826 if (new_mtu == dev->mtu)
4829 /* MTU must be positive. */
4833 if (!netif_device_present(dev))
4837 if (ops->ndo_change_mtu)
4838 err = ops->ndo_change_mtu(dev, new_mtu);
4842 if (!err && dev->flags & IFF_UP)
4843 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4846 EXPORT_SYMBOL(dev_set_mtu);
4849 * dev_set_group - Change group this device belongs to
4851 * @new_group: group this device should belong to
4853 void dev_set_group(struct net_device *dev, int new_group)
4855 dev->group = new_group;
4857 EXPORT_SYMBOL(dev_set_group);
4860 * dev_set_mac_address - Change Media Access Control Address
4864 * Change the hardware (MAC) address of the device
4866 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4868 const struct net_device_ops *ops = dev->netdev_ops;
4871 if (!ops->ndo_set_mac_address)
4873 if (sa->sa_family != dev->type)
4875 if (!netif_device_present(dev))
4877 err = ops->ndo_set_mac_address(dev, sa);
4879 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4880 add_device_randomness(dev->dev_addr, dev->addr_len);
4883 EXPORT_SYMBOL(dev_set_mac_address);
4886 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4888 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4891 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4897 case SIOCGIFFLAGS: /* Get interface flags */
4898 ifr->ifr_flags = (short) dev_get_flags(dev);
4901 case SIOCGIFMETRIC: /* Get the metric on the interface
4902 (currently unused) */
4903 ifr->ifr_metric = 0;
4906 case SIOCGIFMTU: /* Get the MTU of a device */
4907 ifr->ifr_mtu = dev->mtu;
4912 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4914 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4915 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4916 ifr->ifr_hwaddr.sa_family = dev->type;
4924 ifr->ifr_map.mem_start = dev->mem_start;
4925 ifr->ifr_map.mem_end = dev->mem_end;
4926 ifr->ifr_map.base_addr = dev->base_addr;
4927 ifr->ifr_map.irq = dev->irq;
4928 ifr->ifr_map.dma = dev->dma;
4929 ifr->ifr_map.port = dev->if_port;
4933 ifr->ifr_ifindex = dev->ifindex;
4937 ifr->ifr_qlen = dev->tx_queue_len;
4941 /* dev_ioctl() should ensure this case
4953 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4955 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4958 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4959 const struct net_device_ops *ops;
4964 ops = dev->netdev_ops;
4967 case SIOCSIFFLAGS: /* Set interface flags */
4968 return dev_change_flags(dev, ifr->ifr_flags);
4970 case SIOCSIFMETRIC: /* Set the metric on the interface
4971 (currently unused) */
4974 case SIOCSIFMTU: /* Set the MTU of a device */
4975 return dev_set_mtu(dev, ifr->ifr_mtu);
4978 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4980 case SIOCSIFHWBROADCAST:
4981 if (ifr->ifr_hwaddr.sa_family != dev->type)
4983 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4984 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4985 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4989 if (ops->ndo_set_config) {
4990 if (!netif_device_present(dev))
4992 return ops->ndo_set_config(dev, &ifr->ifr_map);
4997 if (!ops->ndo_set_rx_mode ||
4998 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5000 if (!netif_device_present(dev))
5002 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
5005 if (!ops->ndo_set_rx_mode ||
5006 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5008 if (!netif_device_present(dev))
5010 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
5013 if (ifr->ifr_qlen < 0)
5015 dev->tx_queue_len = ifr->ifr_qlen;
5019 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5020 return dev_change_name(dev, ifr->ifr_newname);
5023 err = net_hwtstamp_validate(ifr);
5029 * Unknown or private ioctl
5032 if ((cmd >= SIOCDEVPRIVATE &&
5033 cmd <= SIOCDEVPRIVATE + 15) ||
5034 cmd == SIOCBONDENSLAVE ||
5035 cmd == SIOCBONDRELEASE ||
5036 cmd == SIOCBONDSETHWADDR ||
5037 cmd == SIOCBONDSLAVEINFOQUERY ||
5038 cmd == SIOCBONDINFOQUERY ||
5039 cmd == SIOCBONDCHANGEACTIVE ||
5040 cmd == SIOCGMIIPHY ||
5041 cmd == SIOCGMIIREG ||
5042 cmd == SIOCSMIIREG ||
5043 cmd == SIOCBRADDIF ||
5044 cmd == SIOCBRDELIF ||
5045 cmd == SIOCSHWTSTAMP ||
5046 cmd == SIOCWANDEV) {
5048 if (ops->ndo_do_ioctl) {
5049 if (netif_device_present(dev))
5050 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5062 * This function handles all "interface"-type I/O control requests. The actual
5063 * 'doing' part of this is dev_ifsioc above.
5067 * dev_ioctl - network device ioctl
5068 * @net: the applicable net namespace
5069 * @cmd: command to issue
5070 * @arg: pointer to a struct ifreq in user space
5072 * Issue ioctl functions to devices. This is normally called by the
5073 * user space syscall interfaces but can sometimes be useful for
5074 * other purposes. The return value is the return from the syscall if
5075 * positive or a negative errno code on error.
5078 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5084 /* One special case: SIOCGIFCONF takes ifconf argument
5085 and requires shared lock, because it sleeps writing
5089 if (cmd == SIOCGIFCONF) {
5091 ret = dev_ifconf(net, (char __user *) arg);
5095 if (cmd == SIOCGIFNAME)
5096 return dev_ifname(net, (struct ifreq __user *)arg);
5098 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5101 ifr.ifr_name[IFNAMSIZ-1] = 0;
5103 colon = strchr(ifr.ifr_name, ':');
5108 * See which interface the caller is talking about.
5113 * These ioctl calls:
5114 * - can be done by all.
5115 * - atomic and do not require locking.
5126 dev_load(net, ifr.ifr_name);
5128 ret = dev_ifsioc_locked(net, &ifr, cmd);
5133 if (copy_to_user(arg, &ifr,
5134 sizeof(struct ifreq)))
5140 dev_load(net, ifr.ifr_name);
5142 ret = dev_ethtool(net, &ifr);
5147 if (copy_to_user(arg, &ifr,
5148 sizeof(struct ifreq)))
5154 * These ioctl calls:
5155 * - require superuser power.
5156 * - require strict serialization.
5162 if (!capable(CAP_NET_ADMIN))
5164 dev_load(net, ifr.ifr_name);
5166 ret = dev_ifsioc(net, &ifr, cmd);
5171 if (copy_to_user(arg, &ifr,
5172 sizeof(struct ifreq)))
5178 * These ioctl calls:
5179 * - require superuser power.
5180 * - require strict serialization.
5181 * - do not return a value
5191 case SIOCSIFHWBROADCAST:
5194 case SIOCBONDENSLAVE:
5195 case SIOCBONDRELEASE:
5196 case SIOCBONDSETHWADDR:
5197 case SIOCBONDCHANGEACTIVE:
5201 if (!capable(CAP_NET_ADMIN))
5204 case SIOCBONDSLAVEINFOQUERY:
5205 case SIOCBONDINFOQUERY:
5206 dev_load(net, ifr.ifr_name);
5208 ret = dev_ifsioc(net, &ifr, cmd);
5213 /* Get the per device memory space. We can add this but
5214 * currently do not support it */
5216 /* Set the per device memory buffer space.
5217 * Not applicable in our case */
5222 * Unknown or private ioctl.
5225 if (cmd == SIOCWANDEV ||
5226 (cmd >= SIOCDEVPRIVATE &&
5227 cmd <= SIOCDEVPRIVATE + 15)) {
5228 dev_load(net, ifr.ifr_name);
5230 ret = dev_ifsioc(net, &ifr, cmd);
5232 if (!ret && copy_to_user(arg, &ifr,
5233 sizeof(struct ifreq)))
5237 /* Take care of Wireless Extensions */
5238 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5239 return wext_handle_ioctl(net, &ifr, cmd, arg);
5246 * dev_new_index - allocate an ifindex
5247 * @net: the applicable net namespace
5249 * Returns a suitable unique value for a new device interface
5250 * number. The caller must hold the rtnl semaphore or the
5251 * dev_base_lock to be sure it remains unique.
5253 static int dev_new_index(struct net *net)
5259 if (!__dev_get_by_index(net, ifindex))
5264 /* Delayed registration/unregisteration */
5265 static LIST_HEAD(net_todo_list);
5267 static void net_set_todo(struct net_device *dev)
5269 list_add_tail(&dev->todo_list, &net_todo_list);
5272 static void rollback_registered_many(struct list_head *head)
5274 struct net_device *dev, *tmp;
5276 BUG_ON(dev_boot_phase);
5279 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5280 /* Some devices call without registering
5281 * for initialization unwind. Remove those
5282 * devices and proceed with the remaining.
5284 if (dev->reg_state == NETREG_UNINITIALIZED) {
5285 pr_debug("unregister_netdevice: device %s/%p never "
5286 "was registered\n", dev->name, dev);
5289 list_del(&dev->unreg_list);
5292 dev->dismantle = true;
5293 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5296 /* If device is running, close it first. */
5297 dev_close_many(head);
5299 list_for_each_entry(dev, head, unreg_list) {
5300 /* And unlink it from device chain. */
5301 unlist_netdevice(dev);
5303 dev->reg_state = NETREG_UNREGISTERING;
5308 list_for_each_entry(dev, head, unreg_list) {
5309 /* Shutdown queueing discipline. */
5313 /* Notify protocols, that we are about to destroy
5314 this device. They should clean all the things.
5316 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5318 if (!dev->rtnl_link_ops ||
5319 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5320 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5323 * Flush the unicast and multicast chains
5328 if (dev->netdev_ops->ndo_uninit)
5329 dev->netdev_ops->ndo_uninit(dev);
5331 /* Notifier chain MUST detach us from master device. */
5332 WARN_ON(dev->master);
5334 /* Remove entries from kobject tree */
5335 netdev_unregister_kobject(dev);
5338 /* Process any work delayed until the end of the batch */
5339 dev = list_first_entry(head, struct net_device, unreg_list);
5340 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5344 list_for_each_entry(dev, head, unreg_list)
5348 static void rollback_registered(struct net_device *dev)
5352 list_add(&dev->unreg_list, &single);
5353 rollback_registered_many(&single);
5357 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5359 /* Fix illegal checksum combinations */
5360 if ((features & NETIF_F_HW_CSUM) &&
5361 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5362 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5363 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5366 if ((features & NETIF_F_NO_CSUM) &&
5367 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5368 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5369 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5372 /* Fix illegal SG+CSUM combinations. */
5373 if ((features & NETIF_F_SG) &&
5374 !(features & NETIF_F_ALL_CSUM)) {
5376 "Dropping NETIF_F_SG since no checksum feature.\n");
5377 features &= ~NETIF_F_SG;
5380 /* TSO requires that SG is present as well. */
5381 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5382 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5383 features &= ~NETIF_F_ALL_TSO;
5386 /* TSO ECN requires that TSO is present as well. */
5387 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5388 features &= ~NETIF_F_TSO_ECN;
5390 /* Software GSO depends on SG. */
5391 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5392 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5393 features &= ~NETIF_F_GSO;
5396 /* UFO needs SG and checksumming */
5397 if (features & NETIF_F_UFO) {
5398 /* maybe split UFO into V4 and V6? */
5399 if (!((features & NETIF_F_GEN_CSUM) ||
5400 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5401 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5403 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5404 features &= ~NETIF_F_UFO;
5407 if (!(features & NETIF_F_SG)) {
5409 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5410 features &= ~NETIF_F_UFO;
5417 int __netdev_update_features(struct net_device *dev)
5424 features = netdev_get_wanted_features(dev);
5426 if (dev->netdev_ops->ndo_fix_features)
5427 features = dev->netdev_ops->ndo_fix_features(dev, features);
5429 /* driver might be less strict about feature dependencies */
5430 features = netdev_fix_features(dev, features);
5432 if (dev->features == features)
5435 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5436 dev->features, features);
5438 if (dev->netdev_ops->ndo_set_features)
5439 err = dev->netdev_ops->ndo_set_features(dev, features);
5441 if (unlikely(err < 0)) {
5443 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5444 err, features, dev->features);
5449 dev->features = features;
5455 * netdev_update_features - recalculate device features
5456 * @dev: the device to check
5458 * Recalculate dev->features set and send notifications if it
5459 * has changed. Should be called after driver or hardware dependent
5460 * conditions might have changed that influence the features.
5462 void netdev_update_features(struct net_device *dev)
5464 if (__netdev_update_features(dev))
5465 netdev_features_change(dev);
5467 EXPORT_SYMBOL(netdev_update_features);
5470 * netdev_change_features - recalculate device features
5471 * @dev: the device to check
5473 * Recalculate dev->features set and send notifications even
5474 * if they have not changed. Should be called instead of
5475 * netdev_update_features() if also dev->vlan_features might
5476 * have changed to allow the changes to be propagated to stacked
5479 void netdev_change_features(struct net_device *dev)
5481 __netdev_update_features(dev);
5482 netdev_features_change(dev);
5484 EXPORT_SYMBOL(netdev_change_features);
5487 * netif_stacked_transfer_operstate - transfer operstate
5488 * @rootdev: the root or lower level device to transfer state from
5489 * @dev: the device to transfer operstate to
5491 * Transfer operational state from root to device. This is normally
5492 * called when a stacking relationship exists between the root
5493 * device and the device(a leaf device).
5495 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5496 struct net_device *dev)
5498 if (rootdev->operstate == IF_OPER_DORMANT)
5499 netif_dormant_on(dev);
5501 netif_dormant_off(dev);
5503 if (netif_carrier_ok(rootdev)) {
5504 if (!netif_carrier_ok(dev))
5505 netif_carrier_on(dev);
5507 if (netif_carrier_ok(dev))
5508 netif_carrier_off(dev);
5511 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5514 static int netif_alloc_rx_queues(struct net_device *dev)
5516 unsigned int i, count = dev->num_rx_queues;
5517 struct netdev_rx_queue *rx;
5521 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5523 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5528 for (i = 0; i < count; i++)
5534 static void netdev_init_one_queue(struct net_device *dev,
5535 struct netdev_queue *queue, void *_unused)
5537 /* Initialize queue lock */
5538 spin_lock_init(&queue->_xmit_lock);
5539 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5540 queue->xmit_lock_owner = -1;
5541 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5545 static int netif_alloc_netdev_queues(struct net_device *dev)
5547 unsigned int count = dev->num_tx_queues;
5548 struct netdev_queue *tx;
5552 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5554 pr_err("netdev: Unable to allocate %u tx queues.\n",
5560 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5561 spin_lock_init(&dev->tx_global_lock);
5567 * register_netdevice - register a network device
5568 * @dev: device to register
5570 * Take a completed network device structure and add it to the kernel
5571 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5572 * chain. 0 is returned on success. A negative errno code is returned
5573 * on a failure to set up the device, or if the name is a duplicate.
5575 * Callers must hold the rtnl semaphore. You may want
5576 * register_netdev() instead of this.
5579 * The locking appears insufficient to guarantee two parallel registers
5580 * will not get the same name.
5583 int register_netdevice(struct net_device *dev)
5586 struct net *net = dev_net(dev);
5588 BUG_ON(dev_boot_phase);
5593 /* When net_device's are persistent, this will be fatal. */
5594 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5597 spin_lock_init(&dev->addr_list_lock);
5598 netdev_set_addr_lockdep_class(dev);
5602 ret = dev_get_valid_name(dev, dev->name);
5606 /* Init, if this function is available */
5607 if (dev->netdev_ops->ndo_init) {
5608 ret = dev->netdev_ops->ndo_init(dev);
5616 dev->ifindex = dev_new_index(net);
5617 if (dev->iflink == -1)
5618 dev->iflink = dev->ifindex;
5620 /* Transfer changeable features to wanted_features and enable
5621 * software offloads (GSO and GRO).
5623 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5624 dev->features |= NETIF_F_SOFT_FEATURES;
5625 dev->wanted_features = dev->features & dev->hw_features;
5627 /* Turn on no cache copy if HW is doing checksum */
5628 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5629 if ((dev->features & NETIF_F_ALL_CSUM) &&
5630 !(dev->features & NETIF_F_NO_CSUM)) {
5631 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5632 dev->features |= NETIF_F_NOCACHE_COPY;
5635 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5637 dev->vlan_features |= NETIF_F_HIGHDMA;
5639 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5640 ret = notifier_to_errno(ret);
5644 ret = netdev_register_kobject(dev);
5647 dev->reg_state = NETREG_REGISTERED;
5649 __netdev_update_features(dev);
5652 * Default initial state at registry is that the
5653 * device is present.
5656 set_bit(__LINK_STATE_PRESENT, &dev->state);
5658 dev_init_scheduler(dev);
5660 list_netdevice(dev);
5661 add_device_randomness(dev->dev_addr, dev->addr_len);
5663 /* Notify protocols, that a new device appeared. */
5664 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5665 ret = notifier_to_errno(ret);
5667 rollback_registered(dev);
5668 dev->reg_state = NETREG_UNREGISTERED;
5671 * Prevent userspace races by waiting until the network
5672 * device is fully setup before sending notifications.
5674 if (!dev->rtnl_link_ops ||
5675 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5676 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5682 if (dev->netdev_ops->ndo_uninit)
5683 dev->netdev_ops->ndo_uninit(dev);
5686 EXPORT_SYMBOL(register_netdevice);
5689 * init_dummy_netdev - init a dummy network device for NAPI
5690 * @dev: device to init
5692 * This takes a network device structure and initialize the minimum
5693 * amount of fields so it can be used to schedule NAPI polls without
5694 * registering a full blown interface. This is to be used by drivers
5695 * that need to tie several hardware interfaces to a single NAPI
5696 * poll scheduler due to HW limitations.
5698 int init_dummy_netdev(struct net_device *dev)
5700 /* Clear everything. Note we don't initialize spinlocks
5701 * are they aren't supposed to be taken by any of the
5702 * NAPI code and this dummy netdev is supposed to be
5703 * only ever used for NAPI polls
5705 memset(dev, 0, sizeof(struct net_device));
5707 /* make sure we BUG if trying to hit standard
5708 * register/unregister code path
5710 dev->reg_state = NETREG_DUMMY;
5712 /* NAPI wants this */
5713 INIT_LIST_HEAD(&dev->napi_list);
5715 /* a dummy interface is started by default */
5716 set_bit(__LINK_STATE_PRESENT, &dev->state);
5717 set_bit(__LINK_STATE_START, &dev->state);
5719 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5720 * because users of this 'device' dont need to change
5726 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5730 * register_netdev - register a network device
5731 * @dev: device to register
5733 * Take a completed network device structure and add it to the kernel
5734 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5735 * chain. 0 is returned on success. A negative errno code is returned
5736 * on a failure to set up the device, or if the name is a duplicate.
5738 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5739 * and expands the device name if you passed a format string to
5742 int register_netdev(struct net_device *dev)
5747 err = register_netdevice(dev);
5751 EXPORT_SYMBOL(register_netdev);
5753 int netdev_refcnt_read(const struct net_device *dev)
5757 for_each_possible_cpu(i)
5758 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5761 EXPORT_SYMBOL(netdev_refcnt_read);
5764 * netdev_wait_allrefs - wait until all references are gone.
5766 * This is called when unregistering network devices.
5768 * Any protocol or device that holds a reference should register
5769 * for netdevice notification, and cleanup and put back the
5770 * reference if they receive an UNREGISTER event.
5771 * We can get stuck here if buggy protocols don't correctly
5774 static void netdev_wait_allrefs(struct net_device *dev)
5776 unsigned long rebroadcast_time, warning_time;
5779 linkwatch_forget_dev(dev);
5781 rebroadcast_time = warning_time = jiffies;
5782 refcnt = netdev_refcnt_read(dev);
5784 while (refcnt != 0) {
5785 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5788 /* Rebroadcast unregister notification */
5789 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5790 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5791 * should have already handle it the first time */
5793 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5795 /* We must not have linkwatch events
5796 * pending on unregister. If this
5797 * happens, we simply run the queue
5798 * unscheduled, resulting in a noop
5801 linkwatch_run_queue();
5806 rebroadcast_time = jiffies;
5811 refcnt = netdev_refcnt_read(dev);
5813 if (time_after(jiffies, warning_time + 10 * HZ)) {
5814 printk(KERN_EMERG "unregister_netdevice: "
5815 "waiting for %s to become free. Usage "
5818 warning_time = jiffies;
5827 * register_netdevice(x1);
5828 * register_netdevice(x2);
5830 * unregister_netdevice(y1);
5831 * unregister_netdevice(y2);
5837 * We are invoked by rtnl_unlock().
5838 * This allows us to deal with problems:
5839 * 1) We can delete sysfs objects which invoke hotplug
5840 * without deadlocking with linkwatch via keventd.
5841 * 2) Since we run with the RTNL semaphore not held, we can sleep
5842 * safely in order to wait for the netdev refcnt to drop to zero.
5844 * We must not return until all unregister events added during
5845 * the interval the lock was held have been completed.
5847 void netdev_run_todo(void)
5849 struct list_head list;
5851 /* Snapshot list, allow later requests */
5852 list_replace_init(&net_todo_list, &list);
5856 /* Wait for rcu callbacks to finish before attempting to drain
5857 * the device list. This usually avoids a 250ms wait.
5859 if (!list_empty(&list))
5862 while (!list_empty(&list)) {
5863 struct net_device *dev
5864 = list_first_entry(&list, struct net_device, todo_list);
5865 list_del(&dev->todo_list);
5867 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5868 printk(KERN_ERR "network todo '%s' but state %d\n",
5869 dev->name, dev->reg_state);
5874 dev->reg_state = NETREG_UNREGISTERED;
5876 on_each_cpu(flush_backlog, dev, 1);
5878 netdev_wait_allrefs(dev);
5881 BUG_ON(netdev_refcnt_read(dev));
5882 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5883 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5884 WARN_ON(dev->dn_ptr);
5886 if (dev->destructor)
5887 dev->destructor(dev);
5889 /* Free network device */
5890 kobject_put(&dev->dev.kobj);
5894 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5895 * fields in the same order, with only the type differing.
5897 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5898 const struct net_device_stats *netdev_stats)
5900 #if BITS_PER_LONG == 64
5901 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5902 memcpy(stats64, netdev_stats, sizeof(*stats64));
5904 size_t i, n = sizeof(*stats64) / sizeof(u64);
5905 const unsigned long *src = (const unsigned long *)netdev_stats;
5906 u64 *dst = (u64 *)stats64;
5908 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5909 sizeof(*stats64) / sizeof(u64));
5910 for (i = 0; i < n; i++)
5916 * dev_get_stats - get network device statistics
5917 * @dev: device to get statistics from
5918 * @storage: place to store stats
5920 * Get network statistics from device. Return @storage.
5921 * The device driver may provide its own method by setting
5922 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5923 * otherwise the internal statistics structure is used.
5925 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5926 struct rtnl_link_stats64 *storage)
5928 const struct net_device_ops *ops = dev->netdev_ops;
5930 if (ops->ndo_get_stats64) {
5931 memset(storage, 0, sizeof(*storage));
5932 ops->ndo_get_stats64(dev, storage);
5933 } else if (ops->ndo_get_stats) {
5934 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5936 netdev_stats_to_stats64(storage, &dev->stats);
5938 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5941 EXPORT_SYMBOL(dev_get_stats);
5943 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5945 struct netdev_queue *queue = dev_ingress_queue(dev);
5947 #ifdef CONFIG_NET_CLS_ACT
5950 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5953 netdev_init_one_queue(dev, queue, NULL);
5954 queue->qdisc = &noop_qdisc;
5955 queue->qdisc_sleeping = &noop_qdisc;
5956 rcu_assign_pointer(dev->ingress_queue, queue);
5962 * alloc_netdev_mqs - allocate network device
5963 * @sizeof_priv: size of private data to allocate space for
5964 * @name: device name format string
5965 * @setup: callback to initialize device
5966 * @txqs: the number of TX subqueues to allocate
5967 * @rxqs: the number of RX subqueues to allocate
5969 * Allocates a struct net_device with private data area for driver use
5970 * and performs basic initialization. Also allocates subquue structs
5971 * for each queue on the device.
5973 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5974 void (*setup)(struct net_device *),
5975 unsigned int txqs, unsigned int rxqs)
5977 struct net_device *dev;
5979 struct net_device *p;
5981 BUG_ON(strlen(name) >= sizeof(dev->name));
5984 pr_err("alloc_netdev: Unable to allocate device "
5985 "with zero queues.\n");
5991 pr_err("alloc_netdev: Unable to allocate device "
5992 "with zero RX queues.\n");
5997 alloc_size = sizeof(struct net_device);
5999 /* ensure 32-byte alignment of private area */
6000 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6001 alloc_size += sizeof_priv;
6003 /* ensure 32-byte alignment of whole construct */
6004 alloc_size += NETDEV_ALIGN - 1;
6006 p = kzalloc(alloc_size, GFP_KERNEL);
6008 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
6012 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6013 dev->padded = (char *)dev - (char *)p;
6015 dev->pcpu_refcnt = alloc_percpu(int);
6016 if (!dev->pcpu_refcnt)
6019 if (dev_addr_init(dev))
6025 dev_net_set(dev, &init_net);
6027 dev->gso_max_size = GSO_MAX_SIZE;
6028 dev->gso_max_segs = GSO_MAX_SEGS;
6030 INIT_LIST_HEAD(&dev->napi_list);
6031 INIT_LIST_HEAD(&dev->unreg_list);
6032 INIT_LIST_HEAD(&dev->link_watch_list);
6033 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6036 dev->num_tx_queues = txqs;
6037 dev->real_num_tx_queues = txqs;
6038 if (netif_alloc_netdev_queues(dev))
6042 dev->num_rx_queues = rxqs;
6043 dev->real_num_rx_queues = rxqs;
6044 if (netif_alloc_rx_queues(dev))
6048 strcpy(dev->name, name);
6049 dev->group = INIT_NETDEV_GROUP;
6057 free_percpu(dev->pcpu_refcnt);
6067 EXPORT_SYMBOL(alloc_netdev_mqs);
6070 * free_netdev - free network device
6073 * This function does the last stage of destroying an allocated device
6074 * interface. The reference to the device object is released.
6075 * If this is the last reference then it will be freed.
6077 void free_netdev(struct net_device *dev)
6079 struct napi_struct *p, *n;
6081 release_net(dev_net(dev));
6088 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6090 /* Flush device addresses */
6091 dev_addr_flush(dev);
6093 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6096 free_percpu(dev->pcpu_refcnt);
6097 dev->pcpu_refcnt = NULL;
6099 /* Compatibility with error handling in drivers */
6100 if (dev->reg_state == NETREG_UNINITIALIZED) {
6101 kfree((char *)dev - dev->padded);
6105 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6106 dev->reg_state = NETREG_RELEASED;
6108 /* will free via device release */
6109 put_device(&dev->dev);
6111 EXPORT_SYMBOL(free_netdev);
6114 * synchronize_net - Synchronize with packet receive processing
6116 * Wait for packets currently being received to be done.
6117 * Does not block later packets from starting.
6119 void synchronize_net(void)
6122 if (rtnl_is_locked())
6123 synchronize_rcu_expedited();
6127 EXPORT_SYMBOL(synchronize_net);
6130 * unregister_netdevice_queue - remove device from the kernel
6134 * This function shuts down a device interface and removes it
6135 * from the kernel tables.
6136 * If head not NULL, device is queued to be unregistered later.
6138 * Callers must hold the rtnl semaphore. You may want
6139 * unregister_netdev() instead of this.
6142 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6147 list_move_tail(&dev->unreg_list, head);
6149 rollback_registered(dev);
6150 /* Finish processing unregister after unlock */
6154 EXPORT_SYMBOL(unregister_netdevice_queue);
6157 * unregister_netdevice_many - unregister many devices
6158 * @head: list of devices
6160 void unregister_netdevice_many(struct list_head *head)
6162 struct net_device *dev;
6164 if (!list_empty(head)) {
6165 rollback_registered_many(head);
6166 list_for_each_entry(dev, head, unreg_list)
6170 EXPORT_SYMBOL(unregister_netdevice_many);
6173 * unregister_netdev - remove device from the kernel
6176 * This function shuts down a device interface and removes it
6177 * from the kernel tables.
6179 * This is just a wrapper for unregister_netdevice that takes
6180 * the rtnl semaphore. In general you want to use this and not
6181 * unregister_netdevice.
6183 void unregister_netdev(struct net_device *dev)
6186 unregister_netdevice(dev);
6189 EXPORT_SYMBOL(unregister_netdev);
6192 * dev_change_net_namespace - move device to different nethost namespace
6194 * @net: network namespace
6195 * @pat: If not NULL name pattern to try if the current device name
6196 * is already taken in the destination network namespace.
6198 * This function shuts down a device interface and moves it
6199 * to a new network namespace. On success 0 is returned, on
6200 * a failure a netagive errno code is returned.
6202 * Callers must hold the rtnl semaphore.
6205 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6211 /* Don't allow namespace local devices to be moved. */
6213 if (dev->features & NETIF_F_NETNS_LOCAL)
6216 /* Ensure the device has been registrered */
6218 if (dev->reg_state != NETREG_REGISTERED)
6221 /* Get out if there is nothing todo */
6223 if (net_eq(dev_net(dev), net))
6226 /* Pick the destination device name, and ensure
6227 * we can use it in the destination network namespace.
6230 if (__dev_get_by_name(net, dev->name)) {
6231 /* We get here if we can't use the current device name */
6234 if (dev_get_valid_name(dev, pat) < 0)
6239 * And now a mini version of register_netdevice unregister_netdevice.
6242 /* If device is running close it first. */
6245 /* And unlink it from device chain */
6247 unlist_netdevice(dev);
6251 /* Shutdown queueing discipline. */
6254 /* Notify protocols, that we are about to destroy
6255 this device. They should clean all the things.
6257 Note that dev->reg_state stays at NETREG_REGISTERED.
6258 This is wanted because this way 8021q and macvlan know
6259 the device is just moving and can keep their slaves up.
6261 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6262 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6263 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6266 * Flush the unicast and multicast chains
6271 /* Actually switch the network namespace */
6272 dev_net_set(dev, net);
6274 /* If there is an ifindex conflict assign a new one */
6275 if (__dev_get_by_index(net, dev->ifindex)) {
6276 int iflink = (dev->iflink == dev->ifindex);
6277 dev->ifindex = dev_new_index(net);
6279 dev->iflink = dev->ifindex;
6282 /* Fixup kobjects */
6283 err = device_rename(&dev->dev, dev->name);
6286 /* Add the device back in the hashes */
6287 list_netdevice(dev);
6289 /* Notify protocols, that a new device appeared. */
6290 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6293 * Prevent userspace races by waiting until the network
6294 * device is fully setup before sending notifications.
6296 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6303 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6305 static int dev_cpu_callback(struct notifier_block *nfb,
6306 unsigned long action,
6309 struct sk_buff **list_skb;
6310 struct sk_buff *skb;
6311 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6312 struct softnet_data *sd, *oldsd;
6314 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6317 local_irq_disable();
6318 cpu = smp_processor_id();
6319 sd = &per_cpu(softnet_data, cpu);
6320 oldsd = &per_cpu(softnet_data, oldcpu);
6322 /* Find end of our completion_queue. */
6323 list_skb = &sd->completion_queue;
6325 list_skb = &(*list_skb)->next;
6326 /* Append completion queue from offline CPU. */
6327 *list_skb = oldsd->completion_queue;
6328 oldsd->completion_queue = NULL;
6330 /* Append output queue from offline CPU. */
6331 if (oldsd->output_queue) {
6332 *sd->output_queue_tailp = oldsd->output_queue;
6333 sd->output_queue_tailp = oldsd->output_queue_tailp;
6334 oldsd->output_queue = NULL;
6335 oldsd->output_queue_tailp = &oldsd->output_queue;
6337 /* Append NAPI poll list from offline CPU. */
6338 if (!list_empty(&oldsd->poll_list)) {
6339 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6340 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6343 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6346 /* Process offline CPU's input_pkt_queue */
6347 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6349 input_queue_head_incr(oldsd);
6351 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6353 input_queue_head_incr(oldsd);
6361 * netdev_increment_features - increment feature set by one
6362 * @all: current feature set
6363 * @one: new feature set
6364 * @mask: mask feature set
6366 * Computes a new feature set after adding a device with feature set
6367 * @one to the master device with current feature set @all. Will not
6368 * enable anything that is off in @mask. Returns the new feature set.
6370 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6372 if (mask & NETIF_F_GEN_CSUM)
6373 mask |= NETIF_F_ALL_CSUM;
6374 mask |= NETIF_F_VLAN_CHALLENGED;
6376 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6377 all &= one | ~NETIF_F_ALL_FOR_ALL;
6379 /* If device needs checksumming, downgrade to it. */
6380 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6381 all &= ~NETIF_F_NO_CSUM;
6383 /* If one device supports hw checksumming, set for all. */
6384 if (all & NETIF_F_GEN_CSUM)
6385 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6389 EXPORT_SYMBOL(netdev_increment_features);
6391 static struct hlist_head *netdev_create_hash(void)
6394 struct hlist_head *hash;
6396 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6398 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6399 INIT_HLIST_HEAD(&hash[i]);
6404 /* Initialize per network namespace state */
6405 static int __net_init netdev_init(struct net *net)
6407 if (net != &init_net)
6408 INIT_LIST_HEAD(&net->dev_base_head);
6410 net->dev_name_head = netdev_create_hash();
6411 if (net->dev_name_head == NULL)
6414 net->dev_index_head = netdev_create_hash();
6415 if (net->dev_index_head == NULL)
6421 kfree(net->dev_name_head);
6427 * netdev_drivername - network driver for the device
6428 * @dev: network device
6430 * Determine network driver for device.
6432 const char *netdev_drivername(const struct net_device *dev)
6434 const struct device_driver *driver;
6435 const struct device *parent;
6436 const char *empty = "";
6438 parent = dev->dev.parent;
6442 driver = parent->driver;
6443 if (driver && driver->name)
6444 return driver->name;
6448 int __netdev_printk(const char *level, const struct net_device *dev,
6449 struct va_format *vaf)
6453 if (dev && dev->dev.parent)
6454 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6455 netdev_name(dev), vaf);
6457 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6459 r = printk("%s(NULL net_device): %pV", level, vaf);
6463 EXPORT_SYMBOL(__netdev_printk);
6465 int netdev_printk(const char *level, const struct net_device *dev,
6466 const char *format, ...)
6468 struct va_format vaf;
6472 va_start(args, format);
6477 r = __netdev_printk(level, dev, &vaf);
6482 EXPORT_SYMBOL(netdev_printk);
6484 #define define_netdev_printk_level(func, level) \
6485 int func(const struct net_device *dev, const char *fmt, ...) \
6488 struct va_format vaf; \
6491 va_start(args, fmt); \
6496 r = __netdev_printk(level, dev, &vaf); \
6501 EXPORT_SYMBOL(func);
6503 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6504 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6505 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6506 define_netdev_printk_level(netdev_err, KERN_ERR);
6507 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6508 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6509 define_netdev_printk_level(netdev_info, KERN_INFO);
6511 static void __net_exit netdev_exit(struct net *net)
6513 kfree(net->dev_name_head);
6514 kfree(net->dev_index_head);
6517 static struct pernet_operations __net_initdata netdev_net_ops = {
6518 .init = netdev_init,
6519 .exit = netdev_exit,
6522 static void __net_exit default_device_exit(struct net *net)
6524 struct net_device *dev, *aux;
6526 * Push all migratable network devices back to the
6527 * initial network namespace
6530 for_each_netdev_safe(net, dev, aux) {
6532 char fb_name[IFNAMSIZ];
6534 /* Ignore unmoveable devices (i.e. loopback) */
6535 if (dev->features & NETIF_F_NETNS_LOCAL)
6538 /* Leave virtual devices for the generic cleanup */
6539 if (dev->rtnl_link_ops)
6542 /* Push remaining network devices to init_net */
6543 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6544 err = dev_change_net_namespace(dev, &init_net, fb_name);
6546 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6547 __func__, dev->name, err);
6554 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6556 /* At exit all network devices most be removed from a network
6557 * namespace. Do this in the reverse order of registration.
6558 * Do this across as many network namespaces as possible to
6559 * improve batching efficiency.
6561 struct net_device *dev;
6563 LIST_HEAD(dev_kill_list);
6566 list_for_each_entry(net, net_list, exit_list) {
6567 for_each_netdev_reverse(net, dev) {
6568 if (dev->rtnl_link_ops)
6569 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6571 unregister_netdevice_queue(dev, &dev_kill_list);
6574 unregister_netdevice_many(&dev_kill_list);
6575 list_del(&dev_kill_list);
6579 static struct pernet_operations __net_initdata default_device_ops = {
6580 .exit = default_device_exit,
6581 .exit_batch = default_device_exit_batch,
6585 * Initialize the DEV module. At boot time this walks the device list and
6586 * unhooks any devices that fail to initialise (normally hardware not
6587 * present) and leaves us with a valid list of present and active devices.
6592 * This is called single threaded during boot, so no need
6593 * to take the rtnl semaphore.
6595 static int __init net_dev_init(void)
6597 int i, rc = -ENOMEM;
6599 BUG_ON(!dev_boot_phase);
6601 if (dev_proc_init())
6604 if (netdev_kobject_init())
6607 INIT_LIST_HEAD(&ptype_all);
6608 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6609 INIT_LIST_HEAD(&ptype_base[i]);
6611 if (register_pernet_subsys(&netdev_net_ops))
6615 * Initialise the packet receive queues.
6618 for_each_possible_cpu(i) {
6619 struct softnet_data *sd = &per_cpu(softnet_data, i);
6621 memset(sd, 0, sizeof(*sd));
6622 skb_queue_head_init(&sd->input_pkt_queue);
6623 skb_queue_head_init(&sd->process_queue);
6624 sd->completion_queue = NULL;
6625 INIT_LIST_HEAD(&sd->poll_list);
6626 sd->output_queue = NULL;
6627 sd->output_queue_tailp = &sd->output_queue;
6629 sd->csd.func = rps_trigger_softirq;
6635 sd->backlog.poll = process_backlog;
6636 sd->backlog.weight = weight_p;
6637 sd->backlog.gro_list = NULL;
6638 sd->backlog.gro_count = 0;
6643 /* The loopback device is special if any other network devices
6644 * is present in a network namespace the loopback device must
6645 * be present. Since we now dynamically allocate and free the
6646 * loopback device ensure this invariant is maintained by
6647 * keeping the loopback device as the first device on the
6648 * list of network devices. Ensuring the loopback devices
6649 * is the first device that appears and the last network device
6652 if (register_pernet_device(&loopback_net_ops))
6655 if (register_pernet_device(&default_device_ops))
6658 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6659 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6661 hotcpu_notifier(dev_cpu_callback, 0);
6669 subsys_initcall(net_dev_init);
6671 static int __init initialize_hashrnd(void)
6673 get_random_bytes(&hashrnd, sizeof(hashrnd));
6677 late_initcall_sync(initialize_hashrnd);