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 == '/' || *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);
1619 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1623 nf_reset_trace(skb);
1624 return netif_rx(skb);
1626 EXPORT_SYMBOL_GPL(dev_forward_skb);
1628 static inline int deliver_skb(struct sk_buff *skb,
1629 struct packet_type *pt_prev,
1630 struct net_device *orig_dev)
1632 atomic_inc(&skb->users);
1633 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1636 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1638 if (!ptype->af_packet_priv || !skb->sk)
1641 if (ptype->id_match)
1642 return ptype->id_match(ptype, skb->sk);
1643 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1650 * Support routine. Sends outgoing frames to any network
1651 * taps currently in use.
1654 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1656 struct packet_type *ptype;
1657 struct sk_buff *skb2 = NULL;
1658 struct packet_type *pt_prev = NULL;
1661 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1662 /* Never send packets back to the socket
1663 * they originated from - MvS (miquels@drinkel.ow.org)
1665 if ((ptype->dev == dev || !ptype->dev) &&
1666 (!skb_loop_sk(ptype, skb))) {
1668 deliver_skb(skb2, pt_prev, skb->dev);
1673 skb2 = skb_clone(skb, GFP_ATOMIC);
1677 net_timestamp_set(skb2);
1679 /* skb->nh should be correctly
1680 set by sender, so that the second statement is
1681 just protection against buggy protocols.
1683 skb_reset_mac_header(skb2);
1685 if (skb_network_header(skb2) < skb2->data ||
1686 skb2->network_header > skb2->tail) {
1687 if (net_ratelimit())
1688 printk(KERN_CRIT "protocol %04x is "
1690 ntohs(skb2->protocol),
1692 skb_reset_network_header(skb2);
1695 skb2->transport_header = skb2->network_header;
1696 skb2->pkt_type = PACKET_OUTGOING;
1701 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1705 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1706 * @dev: Network device
1707 * @txq: number of queues available
1709 * If real_num_tx_queues is changed the tc mappings may no longer be
1710 * valid. To resolve this verify the tc mapping remains valid and if
1711 * not NULL the mapping. With no priorities mapping to this
1712 * offset/count pair it will no longer be used. In the worst case TC0
1713 * is invalid nothing can be done so disable priority mappings. If is
1714 * expected that drivers will fix this mapping if they can before
1715 * calling netif_set_real_num_tx_queues.
1717 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1720 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1722 /* If TC0 is invalidated disable TC mapping */
1723 if (tc->offset + tc->count > txq) {
1724 pr_warning("Number of in use tx queues changed "
1725 "invalidating tc mappings. Priority "
1726 "traffic classification disabled!\n");
1731 /* Invalidated prio to tc mappings set to TC0 */
1732 for (i = 1; i < TC_BITMASK + 1; i++) {
1733 int q = netdev_get_prio_tc_map(dev, i);
1735 tc = &dev->tc_to_txq[q];
1736 if (tc->offset + tc->count > txq) {
1737 pr_warning("Number of in use tx queues "
1738 "changed. Priority %i to tc "
1739 "mapping %i is no longer valid "
1740 "setting map to 0\n",
1742 netdev_set_prio_tc_map(dev, i, 0);
1748 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1749 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1751 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1755 if (txq < 1 || txq > dev->num_tx_queues)
1758 if (dev->reg_state == NETREG_REGISTERED ||
1759 dev->reg_state == NETREG_UNREGISTERING) {
1762 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1768 netif_setup_tc(dev, txq);
1770 if (txq < dev->real_num_tx_queues)
1771 qdisc_reset_all_tx_gt(dev, txq);
1774 dev->real_num_tx_queues = txq;
1777 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1781 * netif_set_real_num_rx_queues - set actual number of RX queues used
1782 * @dev: Network device
1783 * @rxq: Actual number of RX queues
1785 * This must be called either with the rtnl_lock held or before
1786 * registration of the net device. Returns 0 on success, or a
1787 * negative error code. If called before registration, it always
1790 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1794 if (rxq < 1 || rxq > dev->num_rx_queues)
1797 if (dev->reg_state == NETREG_REGISTERED) {
1800 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1806 dev->real_num_rx_queues = rxq;
1809 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1812 static inline void __netif_reschedule(struct Qdisc *q)
1814 struct softnet_data *sd;
1815 unsigned long flags;
1817 local_irq_save(flags);
1818 sd = &__get_cpu_var(softnet_data);
1819 q->next_sched = NULL;
1820 *sd->output_queue_tailp = q;
1821 sd->output_queue_tailp = &q->next_sched;
1822 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1823 local_irq_restore(flags);
1826 void __netif_schedule(struct Qdisc *q)
1828 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1829 __netif_reschedule(q);
1831 EXPORT_SYMBOL(__netif_schedule);
1833 void dev_kfree_skb_irq(struct sk_buff *skb)
1835 if (atomic_dec_and_test(&skb->users)) {
1836 struct softnet_data *sd;
1837 unsigned long flags;
1839 local_irq_save(flags);
1840 sd = &__get_cpu_var(softnet_data);
1841 skb->next = sd->completion_queue;
1842 sd->completion_queue = skb;
1843 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1844 local_irq_restore(flags);
1847 EXPORT_SYMBOL(dev_kfree_skb_irq);
1849 void dev_kfree_skb_any(struct sk_buff *skb)
1851 if (in_irq() || irqs_disabled())
1852 dev_kfree_skb_irq(skb);
1856 EXPORT_SYMBOL(dev_kfree_skb_any);
1860 * netif_device_detach - mark device as removed
1861 * @dev: network device
1863 * Mark device as removed from system and therefore no longer available.
1865 void netif_device_detach(struct net_device *dev)
1867 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1868 netif_running(dev)) {
1869 netif_tx_stop_all_queues(dev);
1872 EXPORT_SYMBOL(netif_device_detach);
1875 * netif_device_attach - mark device as attached
1876 * @dev: network device
1878 * Mark device as attached from system and restart if needed.
1880 void netif_device_attach(struct net_device *dev)
1882 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1883 netif_running(dev)) {
1884 netif_tx_wake_all_queues(dev);
1885 __netdev_watchdog_up(dev);
1888 EXPORT_SYMBOL(netif_device_attach);
1891 * Invalidate hardware checksum when packet is to be mangled, and
1892 * complete checksum manually on outgoing path.
1894 int skb_checksum_help(struct sk_buff *skb)
1897 int ret = 0, offset;
1899 if (skb->ip_summed == CHECKSUM_COMPLETE)
1900 goto out_set_summed;
1902 if (unlikely(skb_shinfo(skb)->gso_size)) {
1903 /* Let GSO fix up the checksum. */
1904 goto out_set_summed;
1907 offset = skb_checksum_start_offset(skb);
1908 BUG_ON(offset >= skb_headlen(skb));
1909 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1911 offset += skb->csum_offset;
1912 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1914 if (skb_cloned(skb) &&
1915 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1916 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1921 *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;
1923 skb->ip_summed = CHECKSUM_NONE;
1927 EXPORT_SYMBOL(skb_checksum_help);
1930 * skb_gso_segment - Perform segmentation on skb.
1931 * @skb: buffer to segment
1932 * @features: features for the output path (see dev->features)
1934 * This function segments the given skb and returns a list of segments.
1936 * It may return NULL if the skb requires no segmentation. This is
1937 * only possible when GSO is used for verifying header integrity.
1939 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1941 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1942 struct packet_type *ptype;
1943 __be16 type = skb->protocol;
1944 int vlan_depth = ETH_HLEN;
1947 while (type == htons(ETH_P_8021Q)) {
1948 struct vlan_hdr *vh;
1950 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1951 return ERR_PTR(-EINVAL);
1953 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1954 type = vh->h_vlan_encapsulated_proto;
1955 vlan_depth += VLAN_HLEN;
1958 skb_reset_mac_header(skb);
1959 skb->mac_len = skb->network_header - skb->mac_header;
1960 __skb_pull(skb, skb->mac_len);
1962 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1963 struct net_device *dev = skb->dev;
1964 struct ethtool_drvinfo info = {};
1966 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1967 dev->ethtool_ops->get_drvinfo(dev, &info);
1969 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1970 info.driver, dev ? dev->features : 0L,
1971 skb->sk ? skb->sk->sk_route_caps : 0L,
1972 skb->len, skb->data_len, skb->ip_summed);
1974 if (skb_header_cloned(skb) &&
1975 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1976 return ERR_PTR(err);
1980 list_for_each_entry_rcu(ptype,
1981 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1982 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1983 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1984 err = ptype->gso_send_check(skb);
1985 segs = ERR_PTR(err);
1986 if (err || skb_gso_ok(skb, features))
1988 __skb_push(skb, (skb->data -
1989 skb_network_header(skb)));
1991 segs = ptype->gso_segment(skb, features);
1997 __skb_push(skb, skb->data - skb_mac_header(skb));
2001 EXPORT_SYMBOL(skb_gso_segment);
2003 /* Take action when hardware reception checksum errors are detected. */
2005 void netdev_rx_csum_fault(struct net_device *dev)
2007 if (net_ratelimit()) {
2008 printk(KERN_ERR "%s: hw csum failure.\n",
2009 dev ? dev->name : "<unknown>");
2013 EXPORT_SYMBOL(netdev_rx_csum_fault);
2016 /* Actually, we should eliminate this check as soon as we know, that:
2017 * 1. IOMMU is present and allows to map all the memory.
2018 * 2. No high memory really exists on this machine.
2021 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2023 #ifdef CONFIG_HIGHMEM
2025 if (!(dev->features & NETIF_F_HIGHDMA)) {
2026 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2027 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2028 if (PageHighMem(skb_frag_page(frag)))
2033 if (PCI_DMA_BUS_IS_PHYS) {
2034 struct device *pdev = dev->dev.parent;
2038 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2039 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2040 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2041 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2050 void (*destructor)(struct sk_buff *skb);
2053 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2055 static void dev_gso_skb_destructor(struct sk_buff *skb)
2057 struct dev_gso_cb *cb;
2060 struct sk_buff *nskb = skb->next;
2062 skb->next = nskb->next;
2065 } while (skb->next);
2067 cb = DEV_GSO_CB(skb);
2069 cb->destructor(skb);
2073 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2074 * @skb: buffer to segment
2075 * @features: device features as applicable to this skb
2077 * This function segments the given skb and stores the list of segments
2080 static int dev_gso_segment(struct sk_buff *skb, int features)
2082 struct sk_buff *segs;
2084 segs = skb_gso_segment(skb, features);
2086 /* Verifying header integrity only. */
2091 return PTR_ERR(segs);
2094 DEV_GSO_CB(skb)->destructor = skb->destructor;
2095 skb->destructor = dev_gso_skb_destructor;
2100 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2102 return ((features & NETIF_F_GEN_CSUM) ||
2103 ((features & NETIF_F_V4_CSUM) &&
2104 protocol == htons(ETH_P_IP)) ||
2105 ((features & NETIF_F_V6_CSUM) &&
2106 protocol == htons(ETH_P_IPV6)) ||
2107 ((features & NETIF_F_FCOE_CRC) &&
2108 protocol == htons(ETH_P_FCOE)));
2111 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2113 if (skb->ip_summed != CHECKSUM_NONE &&
2114 !can_checksum_protocol(features, protocol)) {
2115 features &= ~NETIF_F_ALL_CSUM;
2116 features &= ~NETIF_F_SG;
2117 } else if (illegal_highdma(skb->dev, skb)) {
2118 features &= ~NETIF_F_SG;
2124 u32 netif_skb_features(struct sk_buff *skb)
2126 __be16 protocol = skb->protocol;
2127 u32 features = skb->dev->features;
2129 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2130 features &= ~NETIF_F_GSO_MASK;
2132 if (!vlan_tx_tag_present(skb)) {
2133 if (unlikely(protocol == htons(ETH_P_8021Q))) {
2134 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2135 protocol = veh->h_vlan_encapsulated_proto;
2137 return harmonize_features(skb, protocol, features);
2141 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2143 if (protocol != htons(ETH_P_8021Q)) {
2144 return harmonize_features(skb, protocol, features);
2146 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2147 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2148 return harmonize_features(skb, protocol, features);
2151 EXPORT_SYMBOL(netif_skb_features);
2154 * Returns true if either:
2155 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2156 * 2. skb is fragmented and the device does not support SG, or if
2157 * at least one of fragments is in highmem and device does not
2158 * support DMA from it.
2160 static inline int skb_needs_linearize(struct sk_buff *skb,
2163 return skb_is_nonlinear(skb) &&
2164 ((skb_has_frag_list(skb) &&
2165 !(features & NETIF_F_FRAGLIST)) ||
2166 (skb_shinfo(skb)->nr_frags &&
2167 !(features & NETIF_F_SG)));
2170 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2171 struct netdev_queue *txq)
2173 const struct net_device_ops *ops = dev->netdev_ops;
2174 int rc = NETDEV_TX_OK;
2175 unsigned int skb_len;
2177 if (likely(!skb->next)) {
2181 * If device doesn't need skb->dst, release it right now while
2182 * its hot in this cpu cache
2184 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2187 if (!list_empty(&ptype_all))
2188 dev_queue_xmit_nit(skb, dev);
2190 features = netif_skb_features(skb);
2192 if (vlan_tx_tag_present(skb) &&
2193 !(features & NETIF_F_HW_VLAN_TX)) {
2194 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2201 if (netif_needs_gso(skb, features)) {
2202 if (unlikely(dev_gso_segment(skb, features)))
2207 if (skb_needs_linearize(skb, features) &&
2208 __skb_linearize(skb))
2211 /* If packet is not checksummed and device does not
2212 * support checksumming for this protocol, complete
2213 * checksumming here.
2215 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2216 skb_set_transport_header(skb,
2217 skb_checksum_start_offset(skb));
2218 if (!(features & NETIF_F_ALL_CSUM) &&
2219 skb_checksum_help(skb))
2225 rc = ops->ndo_start_xmit(skb, dev);
2226 trace_net_dev_xmit(skb, rc, dev, skb_len);
2227 if (rc == NETDEV_TX_OK)
2228 txq_trans_update(txq);
2234 struct sk_buff *nskb = skb->next;
2236 skb->next = nskb->next;
2240 * If device doesn't need nskb->dst, release it right now while
2241 * its hot in this cpu cache
2243 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2246 skb_len = nskb->len;
2247 rc = ops->ndo_start_xmit(nskb, dev);
2248 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2249 if (unlikely(rc != NETDEV_TX_OK)) {
2250 if (rc & ~NETDEV_TX_MASK)
2251 goto out_kfree_gso_skb;
2252 nskb->next = skb->next;
2256 txq_trans_update(txq);
2257 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2258 return NETDEV_TX_BUSY;
2259 } while (skb->next);
2262 if (likely(skb->next == NULL))
2263 skb->destructor = DEV_GSO_CB(skb)->destructor;
2270 static u32 hashrnd __read_mostly;
2273 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2274 * to be used as a distribution range.
2276 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2277 unsigned int num_tx_queues)
2281 u16 qcount = num_tx_queues;
2283 if (skb_rx_queue_recorded(skb)) {
2284 hash = skb_get_rx_queue(skb);
2285 while (unlikely(hash >= num_tx_queues))
2286 hash -= num_tx_queues;
2291 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2292 qoffset = dev->tc_to_txq[tc].offset;
2293 qcount = dev->tc_to_txq[tc].count;
2296 if (skb->sk && skb->sk->sk_hash)
2297 hash = skb->sk->sk_hash;
2299 hash = (__force u16) skb->protocol;
2300 hash = jhash_1word(hash, hashrnd);
2302 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2304 EXPORT_SYMBOL(__skb_tx_hash);
2306 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2308 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2309 if (net_ratelimit()) {
2310 pr_warning("%s selects TX queue %d, but "
2311 "real number of TX queues is %d\n",
2312 dev->name, queue_index, dev->real_num_tx_queues);
2319 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2322 struct xps_dev_maps *dev_maps;
2323 struct xps_map *map;
2324 int queue_index = -1;
2327 dev_maps = rcu_dereference(dev->xps_maps);
2329 map = rcu_dereference(
2330 dev_maps->cpu_map[raw_smp_processor_id()]);
2333 queue_index = map->queues[0];
2336 if (skb->sk && skb->sk->sk_hash)
2337 hash = skb->sk->sk_hash;
2339 hash = (__force u16) skb->protocol ^
2341 hash = jhash_1word(hash, hashrnd);
2342 queue_index = map->queues[
2343 ((u64)hash * map->len) >> 32];
2345 if (unlikely(queue_index >= dev->real_num_tx_queues))
2357 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2358 struct sk_buff *skb)
2361 const struct net_device_ops *ops = dev->netdev_ops;
2363 if (dev->real_num_tx_queues == 1)
2365 else if (ops->ndo_select_queue) {
2366 queue_index = ops->ndo_select_queue(dev, skb);
2367 queue_index = dev_cap_txqueue(dev, queue_index);
2369 struct sock *sk = skb->sk;
2370 queue_index = sk_tx_queue_get(sk);
2372 if (queue_index < 0 || skb->ooo_okay ||
2373 queue_index >= dev->real_num_tx_queues) {
2374 int old_index = queue_index;
2376 queue_index = get_xps_queue(dev, skb);
2377 if (queue_index < 0)
2378 queue_index = skb_tx_hash(dev, skb);
2380 if (queue_index != old_index && sk) {
2381 struct dst_entry *dst =
2382 rcu_dereference_check(sk->sk_dst_cache, 1);
2384 if (dst && skb_dst(skb) == dst)
2385 sk_tx_queue_set(sk, queue_index);
2390 skb_set_queue_mapping(skb, queue_index);
2391 return netdev_get_tx_queue(dev, queue_index);
2394 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2395 struct net_device *dev,
2396 struct netdev_queue *txq)
2398 spinlock_t *root_lock = qdisc_lock(q);
2402 qdisc_skb_cb(skb)->pkt_len = skb->len;
2403 qdisc_calculate_pkt_len(skb, q);
2405 * Heuristic to force contended enqueues to serialize on a
2406 * separate lock before trying to get qdisc main lock.
2407 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2408 * and dequeue packets faster.
2410 contended = qdisc_is_running(q);
2411 if (unlikely(contended))
2412 spin_lock(&q->busylock);
2414 spin_lock(root_lock);
2415 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2418 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2419 qdisc_run_begin(q)) {
2421 * This is a work-conserving queue; there are no old skbs
2422 * waiting to be sent out; and the qdisc is not running -
2423 * xmit the skb directly.
2425 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2428 qdisc_bstats_update(q, skb);
2430 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2431 if (unlikely(contended)) {
2432 spin_unlock(&q->busylock);
2439 rc = NET_XMIT_SUCCESS;
2442 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2443 if (qdisc_run_begin(q)) {
2444 if (unlikely(contended)) {
2445 spin_unlock(&q->busylock);
2451 spin_unlock(root_lock);
2452 if (unlikely(contended))
2453 spin_unlock(&q->busylock);
2457 static DEFINE_PER_CPU(int, xmit_recursion);
2458 #define RECURSION_LIMIT 10
2461 * dev_queue_xmit - transmit a buffer
2462 * @skb: buffer to transmit
2464 * Queue a buffer for transmission to a network device. The caller must
2465 * have set the device and priority and built the buffer before calling
2466 * this function. The function can be called from an interrupt.
2468 * A negative errno code is returned on a failure. A success does not
2469 * guarantee the frame will be transmitted as it may be dropped due
2470 * to congestion or traffic shaping.
2472 * -----------------------------------------------------------------------------------
2473 * I notice this method can also return errors from the queue disciplines,
2474 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2477 * Regardless of the return value, the skb is consumed, so it is currently
2478 * difficult to retry a send to this method. (You can bump the ref count
2479 * before sending to hold a reference for retry if you are careful.)
2481 * When calling this method, interrupts MUST be enabled. This is because
2482 * the BH enable code must have IRQs enabled so that it will not deadlock.
2485 int dev_queue_xmit(struct sk_buff *skb)
2487 struct net_device *dev = skb->dev;
2488 struct netdev_queue *txq;
2492 /* Disable soft irqs for various locks below. Also
2493 * stops preemption for RCU.
2497 txq = dev_pick_tx(dev, skb);
2498 q = rcu_dereference_bh(txq->qdisc);
2500 #ifdef CONFIG_NET_CLS_ACT
2501 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2503 trace_net_dev_queue(skb);
2505 rc = __dev_xmit_skb(skb, q, dev, txq);
2509 /* The device has no queue. Common case for software devices:
2510 loopback, all the sorts of tunnels...
2512 Really, it is unlikely that netif_tx_lock protection is necessary
2513 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2515 However, it is possible, that they rely on protection
2518 Check this and shot the lock. It is not prone from deadlocks.
2519 Either shot noqueue qdisc, it is even simpler 8)
2521 if (dev->flags & IFF_UP) {
2522 int cpu = smp_processor_id(); /* ok because BHs are off */
2524 if (txq->xmit_lock_owner != cpu) {
2526 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2527 goto recursion_alert;
2529 HARD_TX_LOCK(dev, txq, cpu);
2531 if (!netif_tx_queue_stopped(txq)) {
2532 __this_cpu_inc(xmit_recursion);
2533 rc = dev_hard_start_xmit(skb, dev, txq);
2534 __this_cpu_dec(xmit_recursion);
2535 if (dev_xmit_complete(rc)) {
2536 HARD_TX_UNLOCK(dev, txq);
2540 HARD_TX_UNLOCK(dev, txq);
2541 if (net_ratelimit())
2542 printk(KERN_CRIT "Virtual device %s asks to "
2543 "queue packet!\n", dev->name);
2545 /* Recursion is detected! It is possible,
2549 if (net_ratelimit())
2550 printk(KERN_CRIT "Dead loop on virtual device "
2551 "%s, fix it urgently!\n", dev->name);
2556 rcu_read_unlock_bh();
2561 rcu_read_unlock_bh();
2564 EXPORT_SYMBOL(dev_queue_xmit);
2567 /*=======================================================================
2569 =======================================================================*/
2571 int netdev_max_backlog __read_mostly = 1000;
2572 int netdev_tstamp_prequeue __read_mostly = 1;
2573 int netdev_budget __read_mostly = 300;
2574 int weight_p __read_mostly = 64; /* old backlog weight */
2576 /* Called with irq disabled */
2577 static inline void ____napi_schedule(struct softnet_data *sd,
2578 struct napi_struct *napi)
2580 list_add_tail(&napi->poll_list, &sd->poll_list);
2581 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2585 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2586 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2587 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2588 * if hash is a canonical 4-tuple hash over transport ports.
2590 void __skb_get_rxhash(struct sk_buff *skb)
2592 int nhoff, hash = 0, poff;
2593 const struct ipv6hdr *ip6;
2594 const struct iphdr *ip;
2595 const struct vlan_hdr *vlan;
2604 nhoff = skb_network_offset(skb);
2605 proto = skb->protocol;
2609 case __constant_htons(ETH_P_IP):
2611 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2614 ip = (const struct iphdr *) (skb->data + nhoff);
2617 if (ip_is_fragment(ip))
2620 ip_proto = ip->protocol;
2621 addr1 = (__force u32) ip->saddr;
2622 addr2 = (__force u32) ip->daddr;
2623 nhoff += ip->ihl * 4;
2625 case __constant_htons(ETH_P_IPV6):
2627 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2630 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2631 ip_proto = ip6->nexthdr;
2632 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2633 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2636 case __constant_htons(ETH_P_8021Q):
2637 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2639 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2640 proto = vlan->h_vlan_encapsulated_proto;
2641 nhoff += sizeof(*vlan);
2643 case __constant_htons(ETH_P_PPP_SES):
2644 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2646 proto = *((__be16 *) (skb->data + nhoff +
2647 sizeof(struct pppoe_hdr)));
2648 nhoff += PPPOE_SES_HLEN;
2650 case __constant_htons(PPP_IP):
2652 case __constant_htons(PPP_IPV6):
2663 if (pskb_may_pull(skb, nhoff + 16)) {
2664 u8 *h = skb->data + nhoff;
2665 __be16 flags = *(__be16 *)h;
2668 * Only look inside GRE if version zero and no
2671 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2672 proto = *(__be16 *)(h + 2);
2674 if (flags & GRE_CSUM)
2676 if (flags & GRE_KEY)
2678 if (flags & GRE_SEQ)
2691 poff = proto_ports_offset(ip_proto);
2694 if (pskb_may_pull(skb, nhoff + 4)) {
2695 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2700 /* get a consistent hash (same value on both flow directions) */
2701 if (addr2 < addr1 ||
2703 ports.v16[1] < ports.v16[0])) {
2705 swap(ports.v16[0], ports.v16[1]);
2707 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2714 EXPORT_SYMBOL(__skb_get_rxhash);
2718 /* One global table that all flow-based protocols share. */
2719 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2720 EXPORT_SYMBOL(rps_sock_flow_table);
2722 static struct rps_dev_flow *
2723 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2724 struct rps_dev_flow *rflow, u16 next_cpu)
2726 if (next_cpu != RPS_NO_CPU) {
2727 #ifdef CONFIG_RFS_ACCEL
2728 struct netdev_rx_queue *rxqueue;
2729 struct rps_dev_flow_table *flow_table;
2730 struct rps_dev_flow *old_rflow;
2735 /* Should we steer this flow to a different hardware queue? */
2736 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2737 !(dev->features & NETIF_F_NTUPLE))
2739 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2740 if (rxq_index == skb_get_rx_queue(skb))
2743 rxqueue = dev->_rx + rxq_index;
2744 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2747 flow_id = skb->rxhash & flow_table->mask;
2748 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2749 rxq_index, flow_id);
2753 rflow = &flow_table->flows[flow_id];
2755 if (old_rflow->filter == rflow->filter)
2756 old_rflow->filter = RPS_NO_FILTER;
2760 per_cpu(softnet_data, next_cpu).input_queue_head;
2763 rflow->cpu = next_cpu;
2768 * get_rps_cpu is called from netif_receive_skb and returns the target
2769 * CPU from the RPS map of the receiving queue for a given skb.
2770 * rcu_read_lock must be held on entry.
2772 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2773 struct rps_dev_flow **rflowp)
2775 struct netdev_rx_queue *rxqueue;
2776 struct rps_map *map;
2777 struct rps_dev_flow_table *flow_table;
2778 struct rps_sock_flow_table *sock_flow_table;
2782 if (skb_rx_queue_recorded(skb)) {
2783 u16 index = skb_get_rx_queue(skb);
2784 if (unlikely(index >= dev->real_num_rx_queues)) {
2785 WARN_ONCE(dev->real_num_rx_queues > 1,
2786 "%s received packet on queue %u, but number "
2787 "of RX queues is %u\n",
2788 dev->name, index, dev->real_num_rx_queues);
2791 rxqueue = dev->_rx + index;
2795 map = rcu_dereference(rxqueue->rps_map);
2797 if (map->len == 1 &&
2798 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2799 tcpu = map->cpus[0];
2800 if (cpu_online(tcpu))
2804 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2808 skb_reset_network_header(skb);
2809 if (!skb_get_rxhash(skb))
2812 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2813 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2814 if (flow_table && sock_flow_table) {
2816 struct rps_dev_flow *rflow;
2818 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2821 next_cpu = sock_flow_table->ents[skb->rxhash &
2822 sock_flow_table->mask];
2825 * If the desired CPU (where last recvmsg was done) is
2826 * different from current CPU (one in the rx-queue flow
2827 * table entry), switch if one of the following holds:
2828 * - Current CPU is unset (equal to RPS_NO_CPU).
2829 * - Current CPU is offline.
2830 * - The current CPU's queue tail has advanced beyond the
2831 * last packet that was enqueued using this table entry.
2832 * This guarantees that all previous packets for the flow
2833 * have been dequeued, thus preserving in order delivery.
2835 if (unlikely(tcpu != next_cpu) &&
2836 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2837 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2838 rflow->last_qtail)) >= 0)) {
2840 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2843 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2851 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2853 if (cpu_online(tcpu)) {
2863 #ifdef CONFIG_RFS_ACCEL
2866 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2867 * @dev: Device on which the filter was set
2868 * @rxq_index: RX queue index
2869 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2870 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2872 * Drivers that implement ndo_rx_flow_steer() should periodically call
2873 * this function for each installed filter and remove the filters for
2874 * which it returns %true.
2876 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2877 u32 flow_id, u16 filter_id)
2879 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2880 struct rps_dev_flow_table *flow_table;
2881 struct rps_dev_flow *rflow;
2886 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2887 if (flow_table && flow_id <= flow_table->mask) {
2888 rflow = &flow_table->flows[flow_id];
2889 cpu = ACCESS_ONCE(rflow->cpu);
2890 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2891 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2892 rflow->last_qtail) <
2893 (int)(10 * flow_table->mask)))
2899 EXPORT_SYMBOL(rps_may_expire_flow);
2901 #endif /* CONFIG_RFS_ACCEL */
2903 /* Called from hardirq (IPI) context */
2904 static void rps_trigger_softirq(void *data)
2906 struct softnet_data *sd = data;
2908 ____napi_schedule(sd, &sd->backlog);
2912 #endif /* CONFIG_RPS */
2915 * Check if this softnet_data structure is another cpu one
2916 * If yes, queue it to our IPI list and return 1
2919 static int rps_ipi_queued(struct softnet_data *sd)
2922 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2925 sd->rps_ipi_next = mysd->rps_ipi_list;
2926 mysd->rps_ipi_list = sd;
2928 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2931 #endif /* CONFIG_RPS */
2936 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2937 * queue (may be a remote CPU queue).
2939 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2940 unsigned int *qtail)
2942 struct softnet_data *sd;
2943 unsigned long flags;
2945 sd = &per_cpu(softnet_data, cpu);
2947 local_irq_save(flags);
2950 if (!netif_running(skb->dev))
2952 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2953 if (skb_queue_len(&sd->input_pkt_queue)) {
2955 __skb_queue_tail(&sd->input_pkt_queue, skb);
2956 input_queue_tail_incr_save(sd, qtail);
2958 local_irq_restore(flags);
2959 return NET_RX_SUCCESS;
2962 /* Schedule NAPI for backlog device
2963 * We can use non atomic operation since we own the queue lock
2965 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2966 if (!rps_ipi_queued(sd))
2967 ____napi_schedule(sd, &sd->backlog);
2976 local_irq_restore(flags);
2978 atomic_long_inc(&skb->dev->rx_dropped);
2984 * netif_rx - post buffer to the network code
2985 * @skb: buffer to post
2987 * This function receives a packet from a device driver and queues it for
2988 * the upper (protocol) levels to process. It always succeeds. The buffer
2989 * may be dropped during processing for congestion control or by the
2993 * NET_RX_SUCCESS (no congestion)
2994 * NET_RX_DROP (packet was dropped)
2998 int netif_rx(struct sk_buff *skb)
3002 /* if netpoll wants it, pretend we never saw it */
3003 if (netpoll_rx(skb))
3006 if (netdev_tstamp_prequeue)
3007 net_timestamp_check(skb);
3009 trace_netif_rx(skb);
3012 struct rps_dev_flow voidflow, *rflow = &voidflow;
3018 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3020 cpu = smp_processor_id();
3022 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3030 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3036 EXPORT_SYMBOL(netif_rx);
3038 int netif_rx_ni(struct sk_buff *skb)
3043 err = netif_rx(skb);
3044 if (local_softirq_pending())
3050 EXPORT_SYMBOL(netif_rx_ni);
3052 static void net_tx_action(struct softirq_action *h)
3054 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3056 if (sd->completion_queue) {
3057 struct sk_buff *clist;
3059 local_irq_disable();
3060 clist = sd->completion_queue;
3061 sd->completion_queue = NULL;
3065 struct sk_buff *skb = clist;
3066 clist = clist->next;
3068 WARN_ON(atomic_read(&skb->users));
3069 trace_kfree_skb(skb, net_tx_action);
3074 if (sd->output_queue) {
3077 local_irq_disable();
3078 head = sd->output_queue;
3079 sd->output_queue = NULL;
3080 sd->output_queue_tailp = &sd->output_queue;
3084 struct Qdisc *q = head;
3085 spinlock_t *root_lock;
3087 head = head->next_sched;
3089 root_lock = qdisc_lock(q);
3090 if (spin_trylock(root_lock)) {
3091 smp_mb__before_clear_bit();
3092 clear_bit(__QDISC_STATE_SCHED,
3095 spin_unlock(root_lock);
3097 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3099 __netif_reschedule(q);
3101 smp_mb__before_clear_bit();
3102 clear_bit(__QDISC_STATE_SCHED,
3110 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3111 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3112 /* This hook is defined here for ATM LANE */
3113 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3114 unsigned char *addr) __read_mostly;
3115 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3118 #ifdef CONFIG_NET_CLS_ACT
3119 /* TODO: Maybe we should just force sch_ingress to be compiled in
3120 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3121 * a compare and 2 stores extra right now if we dont have it on
3122 * but have CONFIG_NET_CLS_ACT
3123 * NOTE: This doesn't stop any functionality; if you dont have
3124 * the ingress scheduler, you just can't add policies on ingress.
3127 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3129 struct net_device *dev = skb->dev;
3130 u32 ttl = G_TC_RTTL(skb->tc_verd);
3131 int result = TC_ACT_OK;
3134 if (unlikely(MAX_RED_LOOP < ttl++)) {
3135 if (net_ratelimit())
3136 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3137 skb->skb_iif, dev->ifindex);
3141 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3142 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3145 if (q != &noop_qdisc) {
3146 spin_lock(qdisc_lock(q));
3147 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3148 result = qdisc_enqueue_root(skb, q);
3149 spin_unlock(qdisc_lock(q));
3155 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3156 struct packet_type **pt_prev,
3157 int *ret, struct net_device *orig_dev)
3159 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3161 if (!rxq || rxq->qdisc == &noop_qdisc)
3165 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3169 switch (ing_filter(skb, rxq)) {
3183 * netdev_rx_handler_register - register receive handler
3184 * @dev: device to register a handler for
3185 * @rx_handler: receive handler to register
3186 * @rx_handler_data: data pointer that is used by rx handler
3188 * Register a receive hander for a device. This handler will then be
3189 * called from __netif_receive_skb. A negative errno code is returned
3192 * The caller must hold the rtnl_mutex.
3194 * For a general description of rx_handler, see enum rx_handler_result.
3196 int netdev_rx_handler_register(struct net_device *dev,
3197 rx_handler_func_t *rx_handler,
3198 void *rx_handler_data)
3202 if (dev->rx_handler)
3205 /* Note: rx_handler_data must be set before rx_handler */
3206 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3207 rcu_assign_pointer(dev->rx_handler, rx_handler);
3211 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3214 * netdev_rx_handler_unregister - unregister receive handler
3215 * @dev: device to unregister a handler from
3217 * Unregister a receive hander from a device.
3219 * The caller must hold the rtnl_mutex.
3221 void netdev_rx_handler_unregister(struct net_device *dev)
3225 RCU_INIT_POINTER(dev->rx_handler, NULL);
3226 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3227 * section has a guarantee to see a non NULL rx_handler_data
3231 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3233 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3235 static int __netif_receive_skb(struct sk_buff *skb)
3237 struct packet_type *ptype, *pt_prev;
3238 rx_handler_func_t *rx_handler;
3239 struct net_device *orig_dev;
3240 struct net_device *null_or_dev;
3241 bool deliver_exact = false;
3242 int ret = NET_RX_DROP;
3245 if (!netdev_tstamp_prequeue)
3246 net_timestamp_check(skb);
3248 trace_netif_receive_skb(skb);
3250 /* if we've gotten here through NAPI, check netpoll */
3251 if (netpoll_receive_skb(skb))
3255 skb->skb_iif = skb->dev->ifindex;
3256 orig_dev = skb->dev;
3258 skb_reset_network_header(skb);
3259 skb_reset_transport_header(skb);
3260 skb_reset_mac_len(skb);
3266 __this_cpu_inc(softnet_data.processed);
3268 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3269 skb = vlan_untag(skb);
3274 #ifdef CONFIG_NET_CLS_ACT
3275 if (skb->tc_verd & TC_NCLS) {
3276 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3281 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3282 if (!ptype->dev || ptype->dev == skb->dev) {
3284 ret = deliver_skb(skb, pt_prev, orig_dev);
3289 #ifdef CONFIG_NET_CLS_ACT
3290 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3296 if (vlan_tx_tag_present(skb)) {
3298 ret = deliver_skb(skb, pt_prev, orig_dev);
3301 if (vlan_do_receive(&skb))
3303 else if (unlikely(!skb))
3307 rx_handler = rcu_dereference(skb->dev->rx_handler);
3310 ret = deliver_skb(skb, pt_prev, orig_dev);
3313 switch (rx_handler(&skb)) {
3314 case RX_HANDLER_CONSUMED:
3315 ret = NET_RX_SUCCESS;
3317 case RX_HANDLER_ANOTHER:
3319 case RX_HANDLER_EXACT:
3320 deliver_exact = true;
3321 case RX_HANDLER_PASS:
3328 if (vlan_tx_nonzero_tag_present(skb))
3329 skb->pkt_type = PACKET_OTHERHOST;
3331 /* deliver only exact match when indicated */
3332 null_or_dev = deliver_exact ? skb->dev : NULL;
3334 type = skb->protocol;
3335 list_for_each_entry_rcu(ptype,
3336 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3337 if (ptype->type == type &&
3338 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3339 ptype->dev == orig_dev)) {
3341 ret = deliver_skb(skb, pt_prev, orig_dev);
3347 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3349 atomic_long_inc(&skb->dev->rx_dropped);
3351 /* Jamal, now you will not able to escape explaining
3352 * me how you were going to use this. :-)
3362 * netif_receive_skb - process receive buffer from network
3363 * @skb: buffer to process
3365 * netif_receive_skb() is the main receive data processing function.
3366 * It always succeeds. The buffer may be dropped during processing
3367 * for congestion control or by the protocol layers.
3369 * This function may only be called from softirq context and interrupts
3370 * should be enabled.
3372 * Return values (usually ignored):
3373 * NET_RX_SUCCESS: no congestion
3374 * NET_RX_DROP: packet was dropped
3376 int netif_receive_skb(struct sk_buff *skb)
3380 if (netdev_tstamp_prequeue)
3381 net_timestamp_check(skb);
3383 if (skb_defer_rx_timestamp(skb))
3384 return NET_RX_SUCCESS;
3390 struct rps_dev_flow voidflow, *rflow = &voidflow;
3391 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
3394 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3400 ret = __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 = min_t(unsigned int,
3631 skb_frag_size(&skb_shinfo(skb)->frags[0]),
3632 skb->end - skb->tail);
3635 EXPORT_SYMBOL(skb_gro_reset_offset);
3637 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3639 skb_gro_reset_offset(skb);
3641 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3643 EXPORT_SYMBOL(napi_gro_receive);
3645 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3647 __skb_pull(skb, skb_headlen(skb));
3648 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3649 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3651 skb->dev = napi->dev;
3653 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
3658 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3660 struct sk_buff *skb = napi->skb;
3663 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3669 EXPORT_SYMBOL(napi_get_frags);
3671 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3677 skb->protocol = eth_type_trans(skb, skb->dev);
3679 if (ret == GRO_HELD)
3680 skb_gro_pull(skb, -ETH_HLEN);
3681 else if (netif_receive_skb(skb))
3686 case GRO_MERGED_FREE:
3687 napi_reuse_skb(napi, skb);
3696 EXPORT_SYMBOL(napi_frags_finish);
3698 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3700 struct sk_buff *skb = napi->skb;
3707 skb_reset_mac_header(skb);
3708 skb_gro_reset_offset(skb);
3710 off = skb_gro_offset(skb);
3711 hlen = off + sizeof(*eth);
3712 eth = skb_gro_header_fast(skb, off);
3713 if (skb_gro_header_hard(skb, hlen)) {
3714 eth = skb_gro_header_slow(skb, hlen, off);
3715 if (unlikely(!eth)) {
3716 napi_reuse_skb(napi, skb);
3722 skb_gro_pull(skb, sizeof(*eth));
3725 * This works because the only protocols we care about don't require
3726 * special handling. We'll fix it up properly at the end.
3728 skb->protocol = eth->h_proto;
3733 EXPORT_SYMBOL(napi_frags_skb);
3735 gro_result_t napi_gro_frags(struct napi_struct *napi)
3737 struct sk_buff *skb = napi_frags_skb(napi);
3742 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3744 EXPORT_SYMBOL(napi_gro_frags);
3747 * net_rps_action sends any pending IPI's for rps.
3748 * Note: called with local irq disabled, but exits with local irq enabled.
3750 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3753 struct softnet_data *remsd = sd->rps_ipi_list;
3756 sd->rps_ipi_list = NULL;
3760 /* Send pending IPI's to kick RPS processing on remote cpus. */
3762 struct softnet_data *next = remsd->rps_ipi_next;
3764 if (cpu_online(remsd->cpu))
3765 __smp_call_function_single(remsd->cpu,
3774 static int process_backlog(struct napi_struct *napi, int quota)
3777 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3780 /* Check if we have pending ipi, its better to send them now,
3781 * not waiting net_rx_action() end.
3783 if (sd->rps_ipi_list) {
3784 local_irq_disable();
3785 net_rps_action_and_irq_enable(sd);
3788 napi->weight = weight_p;
3789 local_irq_disable();
3790 while (work < quota) {
3791 struct sk_buff *skb;
3794 while ((skb = __skb_dequeue(&sd->process_queue))) {
3797 __netif_receive_skb(skb);
3799 local_irq_disable();
3800 input_queue_head_incr(sd);
3801 if (++work >= quota) {
3808 qlen = skb_queue_len(&sd->input_pkt_queue);
3810 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3811 &sd->process_queue);
3813 if (qlen < quota - work) {
3815 * Inline a custom version of __napi_complete().
3816 * only current cpu owns and manipulates this napi,
3817 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3818 * we can use a plain write instead of clear_bit(),
3819 * and we dont need an smp_mb() memory barrier.
3821 list_del(&napi->poll_list);
3824 quota = work + qlen;
3834 * __napi_schedule - schedule for receive
3835 * @n: entry to schedule
3837 * The entry's receive function will be scheduled to run
3839 void __napi_schedule(struct napi_struct *n)
3841 unsigned long flags;
3843 local_irq_save(flags);
3844 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3845 local_irq_restore(flags);
3847 EXPORT_SYMBOL(__napi_schedule);
3849 void __napi_complete(struct napi_struct *n)
3851 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3852 BUG_ON(n->gro_list);
3854 list_del(&n->poll_list);
3855 smp_mb__before_clear_bit();
3856 clear_bit(NAPI_STATE_SCHED, &n->state);
3858 EXPORT_SYMBOL(__napi_complete);
3860 void napi_complete(struct napi_struct *n)
3862 unsigned long flags;
3865 * don't let napi dequeue from the cpu poll list
3866 * just in case its running on a different cpu
3868 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3872 local_irq_save(flags);
3874 local_irq_restore(flags);
3876 EXPORT_SYMBOL(napi_complete);
3878 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3879 int (*poll)(struct napi_struct *, int), int weight)
3881 INIT_LIST_HEAD(&napi->poll_list);
3882 napi->gro_count = 0;
3883 napi->gro_list = NULL;
3886 napi->weight = weight;
3887 list_add(&napi->dev_list, &dev->napi_list);
3889 #ifdef CONFIG_NETPOLL
3890 spin_lock_init(&napi->poll_lock);
3891 napi->poll_owner = -1;
3893 set_bit(NAPI_STATE_SCHED, &napi->state);
3895 EXPORT_SYMBOL(netif_napi_add);
3897 void netif_napi_del(struct napi_struct *napi)
3899 struct sk_buff *skb, *next;
3901 list_del_init(&napi->dev_list);
3902 napi_free_frags(napi);
3904 for (skb = napi->gro_list; skb; skb = next) {
3910 napi->gro_list = NULL;
3911 napi->gro_count = 0;
3913 EXPORT_SYMBOL(netif_napi_del);
3915 static void net_rx_action(struct softirq_action *h)
3917 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3918 unsigned long time_limit = jiffies + 2;
3919 int budget = netdev_budget;
3922 local_irq_disable();
3924 while (!list_empty(&sd->poll_list)) {
3925 struct napi_struct *n;
3928 /* If softirq window is exhuasted then punt.
3929 * Allow this to run for 2 jiffies since which will allow
3930 * an average latency of 1.5/HZ.
3932 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3937 /* Even though interrupts have been re-enabled, this
3938 * access is safe because interrupts can only add new
3939 * entries to the tail of this list, and only ->poll()
3940 * calls can remove this head entry from the list.
3942 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3944 have = netpoll_poll_lock(n);
3948 /* This NAPI_STATE_SCHED test is for avoiding a race
3949 * with netpoll's poll_napi(). Only the entity which
3950 * obtains the lock and sees NAPI_STATE_SCHED set will
3951 * actually make the ->poll() call. Therefore we avoid
3952 * accidentally calling ->poll() when NAPI is not scheduled.
3955 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3956 work = n->poll(n, weight);
3960 WARN_ON_ONCE(work > weight);
3964 local_irq_disable();
3966 /* Drivers must not modify the NAPI state if they
3967 * consume the entire weight. In such cases this code
3968 * still "owns" the NAPI instance and therefore can
3969 * move the instance around on the list at-will.
3971 if (unlikely(work == weight)) {
3972 if (unlikely(napi_disable_pending(n))) {
3975 local_irq_disable();
3977 list_move_tail(&n->poll_list, &sd->poll_list);
3980 netpoll_poll_unlock(have);
3983 net_rps_action_and_irq_enable(sd);
3985 #ifdef CONFIG_NET_DMA
3987 * There may not be any more sk_buffs coming right now, so push
3988 * any pending DMA copies to hardware
3990 dma_issue_pending_all();
3997 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4001 static gifconf_func_t *gifconf_list[NPROTO];
4004 * register_gifconf - register a SIOCGIF handler
4005 * @family: Address family
4006 * @gifconf: Function handler
4008 * Register protocol dependent address dumping routines. The handler
4009 * that is passed must not be freed or reused until it has been replaced
4010 * by another handler.
4012 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
4014 if (family >= NPROTO)
4016 gifconf_list[family] = gifconf;
4019 EXPORT_SYMBOL(register_gifconf);
4023 * Map an interface index to its name (SIOCGIFNAME)
4027 * We need this ioctl for efficient implementation of the
4028 * if_indextoname() function required by the IPv6 API. Without
4029 * it, we would have to search all the interfaces to find a
4033 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4035 struct net_device *dev;
4039 * Fetch the caller's info block.
4042 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4046 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4052 strcpy(ifr.ifr_name, dev->name);
4055 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4061 * Perform a SIOCGIFCONF call. This structure will change
4062 * size eventually, and there is nothing I can do about it.
4063 * Thus we will need a 'compatibility mode'.
4066 static int dev_ifconf(struct net *net, char __user *arg)
4069 struct net_device *dev;
4076 * Fetch the caller's info block.
4079 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4086 * Loop over the interfaces, and write an info block for each.
4090 for_each_netdev(net, dev) {
4091 for (i = 0; i < NPROTO; i++) {
4092 if (gifconf_list[i]) {
4095 done = gifconf_list[i](dev, NULL, 0);
4097 done = gifconf_list[i](dev, pos + total,
4107 * All done. Write the updated control block back to the caller.
4109 ifc.ifc_len = total;
4112 * Both BSD and Solaris return 0 here, so we do too.
4114 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4117 #ifdef CONFIG_PROC_FS
4119 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4121 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4122 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4123 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4125 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4127 struct net *net = seq_file_net(seq);
4128 struct net_device *dev;
4129 struct hlist_node *p;
4130 struct hlist_head *h;
4131 unsigned int count = 0, offset = get_offset(*pos);
4133 h = &net->dev_name_head[get_bucket(*pos)];
4134 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4135 if (++count == offset)
4142 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4144 struct net_device *dev;
4145 unsigned int bucket;
4148 dev = dev_from_same_bucket(seq, pos);
4152 bucket = get_bucket(*pos) + 1;
4153 *pos = set_bucket_offset(bucket, 1);
4154 } while (bucket < NETDEV_HASHENTRIES);
4160 * This is invoked by the /proc filesystem handler to display a device
4163 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4168 return SEQ_START_TOKEN;
4170 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4173 return dev_from_bucket(seq, pos);
4176 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4179 return dev_from_bucket(seq, pos);
4182 void dev_seq_stop(struct seq_file *seq, void *v)
4188 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4190 struct rtnl_link_stats64 temp;
4191 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4193 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4194 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4195 dev->name, stats->rx_bytes, stats->rx_packets,
4197 stats->rx_dropped + stats->rx_missed_errors,
4198 stats->rx_fifo_errors,
4199 stats->rx_length_errors + stats->rx_over_errors +
4200 stats->rx_crc_errors + stats->rx_frame_errors,
4201 stats->rx_compressed, stats->multicast,
4202 stats->tx_bytes, stats->tx_packets,
4203 stats->tx_errors, stats->tx_dropped,
4204 stats->tx_fifo_errors, stats->collisions,
4205 stats->tx_carrier_errors +
4206 stats->tx_aborted_errors +
4207 stats->tx_window_errors +
4208 stats->tx_heartbeat_errors,
4209 stats->tx_compressed);
4213 * Called from the PROCfs module. This now uses the new arbitrary sized
4214 * /proc/net interface to create /proc/net/dev
4216 static int dev_seq_show(struct seq_file *seq, void *v)
4218 if (v == SEQ_START_TOKEN)
4219 seq_puts(seq, "Inter-| Receive "
4221 " face |bytes packets errs drop fifo frame "
4222 "compressed multicast|bytes packets errs "
4223 "drop fifo colls carrier compressed\n");
4225 dev_seq_printf_stats(seq, v);
4229 static struct softnet_data *softnet_get_online(loff_t *pos)
4231 struct softnet_data *sd = NULL;
4233 while (*pos < nr_cpu_ids)
4234 if (cpu_online(*pos)) {
4235 sd = &per_cpu(softnet_data, *pos);
4242 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4244 return softnet_get_online(pos);
4247 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4250 return softnet_get_online(pos);
4253 static void softnet_seq_stop(struct seq_file *seq, void *v)
4257 static int softnet_seq_show(struct seq_file *seq, void *v)
4259 struct softnet_data *sd = v;
4261 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4262 sd->processed, sd->dropped, sd->time_squeeze, 0,
4263 0, 0, 0, 0, /* was fastroute */
4264 sd->cpu_collision, sd->received_rps);
4268 static const struct seq_operations dev_seq_ops = {
4269 .start = dev_seq_start,
4270 .next = dev_seq_next,
4271 .stop = dev_seq_stop,
4272 .show = dev_seq_show,
4275 static int dev_seq_open(struct inode *inode, struct file *file)
4277 return seq_open_net(inode, file, &dev_seq_ops,
4278 sizeof(struct seq_net_private));
4281 static const struct file_operations dev_seq_fops = {
4282 .owner = THIS_MODULE,
4283 .open = dev_seq_open,
4285 .llseek = seq_lseek,
4286 .release = seq_release_net,
4289 static const struct seq_operations softnet_seq_ops = {
4290 .start = softnet_seq_start,
4291 .next = softnet_seq_next,
4292 .stop = softnet_seq_stop,
4293 .show = softnet_seq_show,
4296 static int softnet_seq_open(struct inode *inode, struct file *file)
4298 return seq_open(file, &softnet_seq_ops);
4301 static const struct file_operations softnet_seq_fops = {
4302 .owner = THIS_MODULE,
4303 .open = softnet_seq_open,
4305 .llseek = seq_lseek,
4306 .release = seq_release,
4309 static void *ptype_get_idx(loff_t pos)
4311 struct packet_type *pt = NULL;
4315 list_for_each_entry_rcu(pt, &ptype_all, list) {
4321 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4322 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4331 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4335 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4338 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4340 struct packet_type *pt;
4341 struct list_head *nxt;
4345 if (v == SEQ_START_TOKEN)
4346 return ptype_get_idx(0);
4349 nxt = pt->list.next;
4350 if (pt->type == htons(ETH_P_ALL)) {
4351 if (nxt != &ptype_all)
4354 nxt = ptype_base[0].next;
4356 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4358 while (nxt == &ptype_base[hash]) {
4359 if (++hash >= PTYPE_HASH_SIZE)
4361 nxt = ptype_base[hash].next;
4364 return list_entry(nxt, struct packet_type, list);
4367 static void ptype_seq_stop(struct seq_file *seq, void *v)
4373 static int ptype_seq_show(struct seq_file *seq, void *v)
4375 struct packet_type *pt = v;
4377 if (v == SEQ_START_TOKEN)
4378 seq_puts(seq, "Type Device Function\n");
4379 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4380 if (pt->type == htons(ETH_P_ALL))
4381 seq_puts(seq, "ALL ");
4383 seq_printf(seq, "%04x", ntohs(pt->type));
4385 seq_printf(seq, " %-8s %pF\n",
4386 pt->dev ? pt->dev->name : "", pt->func);
4392 static const struct seq_operations ptype_seq_ops = {
4393 .start = ptype_seq_start,
4394 .next = ptype_seq_next,
4395 .stop = ptype_seq_stop,
4396 .show = ptype_seq_show,
4399 static int ptype_seq_open(struct inode *inode, struct file *file)
4401 return seq_open_net(inode, file, &ptype_seq_ops,
4402 sizeof(struct seq_net_private));
4405 static const struct file_operations ptype_seq_fops = {
4406 .owner = THIS_MODULE,
4407 .open = ptype_seq_open,
4409 .llseek = seq_lseek,
4410 .release = seq_release_net,
4414 static int __net_init dev_proc_net_init(struct net *net)
4418 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4420 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4422 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4425 if (wext_proc_init(net))
4431 proc_net_remove(net, "ptype");
4433 proc_net_remove(net, "softnet_stat");
4435 proc_net_remove(net, "dev");
4439 static void __net_exit dev_proc_net_exit(struct net *net)
4441 wext_proc_exit(net);
4443 proc_net_remove(net, "ptype");
4444 proc_net_remove(net, "softnet_stat");
4445 proc_net_remove(net, "dev");
4448 static struct pernet_operations __net_initdata dev_proc_ops = {
4449 .init = dev_proc_net_init,
4450 .exit = dev_proc_net_exit,
4453 static int __init dev_proc_init(void)
4455 return register_pernet_subsys(&dev_proc_ops);
4458 #define dev_proc_init() 0
4459 #endif /* CONFIG_PROC_FS */
4463 * netdev_set_master - set up master pointer
4464 * @slave: slave device
4465 * @master: new master device
4467 * Changes the master device of the slave. Pass %NULL to break the
4468 * bonding. The caller must hold the RTNL semaphore. On a failure
4469 * a negative errno code is returned. On success the reference counts
4470 * are adjusted and the function returns zero.
4472 int netdev_set_master(struct net_device *slave, struct net_device *master)
4474 struct net_device *old = slave->master;
4484 slave->master = master;
4490 EXPORT_SYMBOL(netdev_set_master);
4493 * netdev_set_bond_master - set up bonding master/slave pair
4494 * @slave: slave device
4495 * @master: new master device
4497 * Changes the master device of the slave. Pass %NULL to break the
4498 * bonding. The caller must hold the RTNL semaphore. On a failure
4499 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4500 * to the routing socket and the function returns zero.
4502 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4508 err = netdev_set_master(slave, master);
4512 slave->flags |= IFF_SLAVE;
4514 slave->flags &= ~IFF_SLAVE;
4516 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4519 EXPORT_SYMBOL(netdev_set_bond_master);
4521 static void dev_change_rx_flags(struct net_device *dev, int flags)
4523 const struct net_device_ops *ops = dev->netdev_ops;
4525 if (ops->ndo_change_rx_flags)
4526 ops->ndo_change_rx_flags(dev, flags);
4529 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4531 unsigned short old_flags = dev->flags;
4537 dev->flags |= IFF_PROMISC;
4538 dev->promiscuity += inc;
4539 if (dev->promiscuity == 0) {
4542 * If inc causes overflow, untouch promisc and return error.
4545 dev->flags &= ~IFF_PROMISC;
4547 dev->promiscuity -= inc;
4548 printk(KERN_WARNING "%s: promiscuity touches roof, "
4549 "set promiscuity failed, promiscuity feature "
4550 "of device might be broken.\n", dev->name);
4554 if (dev->flags != old_flags) {
4555 printk(KERN_INFO "device %s %s promiscuous mode\n",
4556 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4558 if (audit_enabled) {
4559 current_uid_gid(&uid, &gid);
4560 audit_log(current->audit_context, GFP_ATOMIC,
4561 AUDIT_ANOM_PROMISCUOUS,
4562 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4563 dev->name, (dev->flags & IFF_PROMISC),
4564 (old_flags & IFF_PROMISC),
4565 audit_get_loginuid(current),
4567 audit_get_sessionid(current));
4570 dev_change_rx_flags(dev, IFF_PROMISC);
4576 * dev_set_promiscuity - update promiscuity count on a device
4580 * Add or remove promiscuity from a device. While the count in the device
4581 * remains above zero the interface remains promiscuous. Once it hits zero
4582 * the device reverts back to normal filtering operation. A negative inc
4583 * value is used to drop promiscuity on the device.
4584 * Return 0 if successful or a negative errno code on error.
4586 int dev_set_promiscuity(struct net_device *dev, int inc)
4588 unsigned short old_flags = dev->flags;
4591 err = __dev_set_promiscuity(dev, inc);
4594 if (dev->flags != old_flags)
4595 dev_set_rx_mode(dev);
4598 EXPORT_SYMBOL(dev_set_promiscuity);
4601 * dev_set_allmulti - update allmulti count on a device
4605 * Add or remove reception of all multicast frames to a device. While the
4606 * count in the device remains above zero the interface remains listening
4607 * to all interfaces. Once it hits zero the device reverts back to normal
4608 * filtering operation. A negative @inc value is used to drop the counter
4609 * when releasing a resource needing all multicasts.
4610 * Return 0 if successful or a negative errno code on error.
4613 int dev_set_allmulti(struct net_device *dev, int inc)
4615 unsigned short old_flags = dev->flags;
4619 dev->flags |= IFF_ALLMULTI;
4620 dev->allmulti += inc;
4621 if (dev->allmulti == 0) {
4624 * If inc causes overflow, untouch allmulti and return error.
4627 dev->flags &= ~IFF_ALLMULTI;
4629 dev->allmulti -= inc;
4630 printk(KERN_WARNING "%s: allmulti touches roof, "
4631 "set allmulti failed, allmulti feature of "
4632 "device might be broken.\n", dev->name);
4636 if (dev->flags ^ old_flags) {
4637 dev_change_rx_flags(dev, IFF_ALLMULTI);
4638 dev_set_rx_mode(dev);
4642 EXPORT_SYMBOL(dev_set_allmulti);
4645 * Upload unicast and multicast address lists to device and
4646 * configure RX filtering. When the device doesn't support unicast
4647 * filtering it is put in promiscuous mode while unicast addresses
4650 void __dev_set_rx_mode(struct net_device *dev)
4652 const struct net_device_ops *ops = dev->netdev_ops;
4654 /* dev_open will call this function so the list will stay sane. */
4655 if (!(dev->flags&IFF_UP))
4658 if (!netif_device_present(dev))
4661 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4662 /* Unicast addresses changes may only happen under the rtnl,
4663 * therefore calling __dev_set_promiscuity here is safe.
4665 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4666 __dev_set_promiscuity(dev, 1);
4667 dev->uc_promisc = true;
4668 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4669 __dev_set_promiscuity(dev, -1);
4670 dev->uc_promisc = false;
4674 if (ops->ndo_set_rx_mode)
4675 ops->ndo_set_rx_mode(dev);
4678 void dev_set_rx_mode(struct net_device *dev)
4680 netif_addr_lock_bh(dev);
4681 __dev_set_rx_mode(dev);
4682 netif_addr_unlock_bh(dev);
4686 * dev_get_flags - get flags reported to userspace
4689 * Get the combination of flag bits exported through APIs to userspace.
4691 unsigned dev_get_flags(const struct net_device *dev)
4695 flags = (dev->flags & ~(IFF_PROMISC |
4700 (dev->gflags & (IFF_PROMISC |
4703 if (netif_running(dev)) {
4704 if (netif_oper_up(dev))
4705 flags |= IFF_RUNNING;
4706 if (netif_carrier_ok(dev))
4707 flags |= IFF_LOWER_UP;
4708 if (netif_dormant(dev))
4709 flags |= IFF_DORMANT;
4714 EXPORT_SYMBOL(dev_get_flags);
4716 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4718 int old_flags = dev->flags;
4724 * Set the flags on our device.
4727 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4728 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4730 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4734 * Load in the correct multicast list now the flags have changed.
4737 if ((old_flags ^ flags) & IFF_MULTICAST)
4738 dev_change_rx_flags(dev, IFF_MULTICAST);
4740 dev_set_rx_mode(dev);
4743 * Have we downed the interface. We handle IFF_UP ourselves
4744 * according to user attempts to set it, rather than blindly
4749 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4750 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4753 dev_set_rx_mode(dev);
4756 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4757 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4759 dev->gflags ^= IFF_PROMISC;
4760 dev_set_promiscuity(dev, inc);
4763 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4764 is important. Some (broken) drivers set IFF_PROMISC, when
4765 IFF_ALLMULTI is requested not asking us and not reporting.
4767 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4768 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4770 dev->gflags ^= IFF_ALLMULTI;
4771 dev_set_allmulti(dev, inc);
4777 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4779 unsigned int changes = dev->flags ^ old_flags;
4781 if (changes & IFF_UP) {
4782 if (dev->flags & IFF_UP)
4783 call_netdevice_notifiers(NETDEV_UP, dev);
4785 call_netdevice_notifiers(NETDEV_DOWN, dev);
4788 if (dev->flags & IFF_UP &&
4789 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4790 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4794 * dev_change_flags - change device settings
4796 * @flags: device state flags
4798 * Change settings on device based state flags. The flags are
4799 * in the userspace exported format.
4801 int dev_change_flags(struct net_device *dev, unsigned flags)
4804 int old_flags = dev->flags;
4806 ret = __dev_change_flags(dev, flags);
4810 changes = old_flags ^ dev->flags;
4812 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4814 __dev_notify_flags(dev, old_flags);
4817 EXPORT_SYMBOL(dev_change_flags);
4820 * dev_set_mtu - Change maximum transfer unit
4822 * @new_mtu: new transfer unit
4824 * Change the maximum transfer size of the network device.
4826 int dev_set_mtu(struct net_device *dev, int new_mtu)
4828 const struct net_device_ops *ops = dev->netdev_ops;
4831 if (new_mtu == dev->mtu)
4834 /* MTU must be positive. */
4838 if (!netif_device_present(dev))
4842 if (ops->ndo_change_mtu)
4843 err = ops->ndo_change_mtu(dev, new_mtu);
4847 if (!err && dev->flags & IFF_UP)
4848 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4851 EXPORT_SYMBOL(dev_set_mtu);
4854 * dev_set_group - Change group this device belongs to
4856 * @new_group: group this device should belong to
4858 void dev_set_group(struct net_device *dev, int new_group)
4860 dev->group = new_group;
4862 EXPORT_SYMBOL(dev_set_group);
4865 * dev_set_mac_address - Change Media Access Control Address
4869 * Change the hardware (MAC) address of the device
4871 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4873 const struct net_device_ops *ops = dev->netdev_ops;
4876 if (!ops->ndo_set_mac_address)
4878 if (sa->sa_family != dev->type)
4880 if (!netif_device_present(dev))
4882 err = ops->ndo_set_mac_address(dev, sa);
4884 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4885 add_device_randomness(dev->dev_addr, dev->addr_len);
4888 EXPORT_SYMBOL(dev_set_mac_address);
4891 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4893 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4896 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4902 case SIOCGIFFLAGS: /* Get interface flags */
4903 ifr->ifr_flags = (short) dev_get_flags(dev);
4906 case SIOCGIFMETRIC: /* Get the metric on the interface
4907 (currently unused) */
4908 ifr->ifr_metric = 0;
4911 case SIOCGIFMTU: /* Get the MTU of a device */
4912 ifr->ifr_mtu = dev->mtu;
4917 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4919 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4920 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4921 ifr->ifr_hwaddr.sa_family = dev->type;
4929 ifr->ifr_map.mem_start = dev->mem_start;
4930 ifr->ifr_map.mem_end = dev->mem_end;
4931 ifr->ifr_map.base_addr = dev->base_addr;
4932 ifr->ifr_map.irq = dev->irq;
4933 ifr->ifr_map.dma = dev->dma;
4934 ifr->ifr_map.port = dev->if_port;
4938 ifr->ifr_ifindex = dev->ifindex;
4942 ifr->ifr_qlen = dev->tx_queue_len;
4946 /* dev_ioctl() should ensure this case
4958 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4960 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4963 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4964 const struct net_device_ops *ops;
4969 ops = dev->netdev_ops;
4972 case SIOCSIFFLAGS: /* Set interface flags */
4973 return dev_change_flags(dev, ifr->ifr_flags);
4975 case SIOCSIFMETRIC: /* Set the metric on the interface
4976 (currently unused) */
4979 case SIOCSIFMTU: /* Set the MTU of a device */
4980 return dev_set_mtu(dev, ifr->ifr_mtu);
4983 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4985 case SIOCSIFHWBROADCAST:
4986 if (ifr->ifr_hwaddr.sa_family != dev->type)
4988 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4989 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4990 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4994 if (ops->ndo_set_config) {
4995 if (!netif_device_present(dev))
4997 return ops->ndo_set_config(dev, &ifr->ifr_map);
5002 if (!ops->ndo_set_rx_mode ||
5003 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5005 if (!netif_device_present(dev))
5007 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
5010 if (!ops->ndo_set_rx_mode ||
5011 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5013 if (!netif_device_present(dev))
5015 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
5018 if (ifr->ifr_qlen < 0)
5020 dev->tx_queue_len = ifr->ifr_qlen;
5024 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5025 return dev_change_name(dev, ifr->ifr_newname);
5028 err = net_hwtstamp_validate(ifr);
5034 * Unknown or private ioctl
5037 if ((cmd >= SIOCDEVPRIVATE &&
5038 cmd <= SIOCDEVPRIVATE + 15) ||
5039 cmd == SIOCBONDENSLAVE ||
5040 cmd == SIOCBONDRELEASE ||
5041 cmd == SIOCBONDSETHWADDR ||
5042 cmd == SIOCBONDSLAVEINFOQUERY ||
5043 cmd == SIOCBONDINFOQUERY ||
5044 cmd == SIOCBONDCHANGEACTIVE ||
5045 cmd == SIOCGMIIPHY ||
5046 cmd == SIOCGMIIREG ||
5047 cmd == SIOCSMIIREG ||
5048 cmd == SIOCBRADDIF ||
5049 cmd == SIOCBRDELIF ||
5050 cmd == SIOCSHWTSTAMP ||
5051 cmd == SIOCWANDEV) {
5053 if (ops->ndo_do_ioctl) {
5054 if (netif_device_present(dev))
5055 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5067 * This function handles all "interface"-type I/O control requests. The actual
5068 * 'doing' part of this is dev_ifsioc above.
5072 * dev_ioctl - network device ioctl
5073 * @net: the applicable net namespace
5074 * @cmd: command to issue
5075 * @arg: pointer to a struct ifreq in user space
5077 * Issue ioctl functions to devices. This is normally called by the
5078 * user space syscall interfaces but can sometimes be useful for
5079 * other purposes. The return value is the return from the syscall if
5080 * positive or a negative errno code on error.
5083 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5089 /* One special case: SIOCGIFCONF takes ifconf argument
5090 and requires shared lock, because it sleeps writing
5094 if (cmd == SIOCGIFCONF) {
5096 ret = dev_ifconf(net, (char __user *) arg);
5100 if (cmd == SIOCGIFNAME)
5101 return dev_ifname(net, (struct ifreq __user *)arg);
5103 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5106 ifr.ifr_name[IFNAMSIZ-1] = 0;
5108 colon = strchr(ifr.ifr_name, ':');
5113 * See which interface the caller is talking about.
5118 * These ioctl calls:
5119 * - can be done by all.
5120 * - atomic and do not require locking.
5131 dev_load(net, ifr.ifr_name);
5133 ret = dev_ifsioc_locked(net, &ifr, cmd);
5138 if (copy_to_user(arg, &ifr,
5139 sizeof(struct ifreq)))
5145 dev_load(net, ifr.ifr_name);
5147 ret = dev_ethtool(net, &ifr);
5152 if (copy_to_user(arg, &ifr,
5153 sizeof(struct ifreq)))
5159 * These ioctl calls:
5160 * - require superuser power.
5161 * - require strict serialization.
5167 if (!capable(CAP_NET_ADMIN))
5169 dev_load(net, ifr.ifr_name);
5171 ret = dev_ifsioc(net, &ifr, cmd);
5176 if (copy_to_user(arg, &ifr,
5177 sizeof(struct ifreq)))
5183 * These ioctl calls:
5184 * - require superuser power.
5185 * - require strict serialization.
5186 * - do not return a value
5196 case SIOCSIFHWBROADCAST:
5199 case SIOCBONDENSLAVE:
5200 case SIOCBONDRELEASE:
5201 case SIOCBONDSETHWADDR:
5202 case SIOCBONDCHANGEACTIVE:
5206 if (!capable(CAP_NET_ADMIN))
5209 case SIOCBONDSLAVEINFOQUERY:
5210 case SIOCBONDINFOQUERY:
5211 dev_load(net, ifr.ifr_name);
5213 ret = dev_ifsioc(net, &ifr, cmd);
5218 /* Get the per device memory space. We can add this but
5219 * currently do not support it */
5221 /* Set the per device memory buffer space.
5222 * Not applicable in our case */
5227 * Unknown or private ioctl.
5230 if (cmd == SIOCWANDEV ||
5231 (cmd >= SIOCDEVPRIVATE &&
5232 cmd <= SIOCDEVPRIVATE + 15)) {
5233 dev_load(net, ifr.ifr_name);
5235 ret = dev_ifsioc(net, &ifr, cmd);
5237 if (!ret && copy_to_user(arg, &ifr,
5238 sizeof(struct ifreq)))
5242 /* Take care of Wireless Extensions */
5243 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5244 return wext_handle_ioctl(net, &ifr, cmd, arg);
5251 * dev_new_index - allocate an ifindex
5252 * @net: the applicable net namespace
5254 * Returns a suitable unique value for a new device interface
5255 * number. The caller must hold the rtnl semaphore or the
5256 * dev_base_lock to be sure it remains unique.
5258 static int dev_new_index(struct net *net)
5264 if (!__dev_get_by_index(net, ifindex))
5269 /* Delayed registration/unregisteration */
5270 static LIST_HEAD(net_todo_list);
5272 static void net_set_todo(struct net_device *dev)
5274 list_add_tail(&dev->todo_list, &net_todo_list);
5277 static void rollback_registered_many(struct list_head *head)
5279 struct net_device *dev, *tmp;
5281 BUG_ON(dev_boot_phase);
5284 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5285 /* Some devices call without registering
5286 * for initialization unwind. Remove those
5287 * devices and proceed with the remaining.
5289 if (dev->reg_state == NETREG_UNINITIALIZED) {
5290 pr_debug("unregister_netdevice: device %s/%p never "
5291 "was registered\n", dev->name, dev);
5294 list_del(&dev->unreg_list);
5297 dev->dismantle = true;
5298 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5301 /* If device is running, close it first. */
5302 dev_close_many(head);
5304 list_for_each_entry(dev, head, unreg_list) {
5305 /* And unlink it from device chain. */
5306 unlist_netdevice(dev);
5308 dev->reg_state = NETREG_UNREGISTERING;
5309 on_each_cpu(flush_backlog, dev, 1);
5314 list_for_each_entry(dev, head, unreg_list) {
5315 /* Shutdown queueing discipline. */
5319 /* Notify protocols, that we are about to destroy
5320 this device. They should clean all the things.
5322 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5324 if (!dev->rtnl_link_ops ||
5325 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5326 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5329 * Flush the unicast and multicast chains
5334 if (dev->netdev_ops->ndo_uninit)
5335 dev->netdev_ops->ndo_uninit(dev);
5337 /* Notifier chain MUST detach us from master device. */
5338 WARN_ON(dev->master);
5340 /* Remove entries from kobject tree */
5341 netdev_unregister_kobject(dev);
5344 /* Process any work delayed until the end of the batch */
5345 dev = list_first_entry(head, struct net_device, unreg_list);
5346 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5350 list_for_each_entry(dev, head, unreg_list)
5354 static void rollback_registered(struct net_device *dev)
5358 list_add(&dev->unreg_list, &single);
5359 rollback_registered_many(&single);
5363 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5365 /* Fix illegal checksum combinations */
5366 if ((features & NETIF_F_HW_CSUM) &&
5367 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5368 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5369 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5372 if ((features & NETIF_F_NO_CSUM) &&
5373 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5374 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5375 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5378 /* Fix illegal SG+CSUM combinations. */
5379 if ((features & NETIF_F_SG) &&
5380 !(features & NETIF_F_ALL_CSUM)) {
5382 "Dropping NETIF_F_SG since no checksum feature.\n");
5383 features &= ~NETIF_F_SG;
5386 /* TSO requires that SG is present as well. */
5387 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5388 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5389 features &= ~NETIF_F_ALL_TSO;
5392 /* TSO ECN requires that TSO is present as well. */
5393 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5394 features &= ~NETIF_F_TSO_ECN;
5396 /* Software GSO depends on SG. */
5397 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5398 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5399 features &= ~NETIF_F_GSO;
5402 /* UFO needs SG and checksumming */
5403 if (features & NETIF_F_UFO) {
5404 /* maybe split UFO into V4 and V6? */
5405 if (!((features & NETIF_F_GEN_CSUM) ||
5406 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5407 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5409 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5410 features &= ~NETIF_F_UFO;
5413 if (!(features & NETIF_F_SG)) {
5415 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5416 features &= ~NETIF_F_UFO;
5423 int __netdev_update_features(struct net_device *dev)
5430 features = netdev_get_wanted_features(dev);
5432 if (dev->netdev_ops->ndo_fix_features)
5433 features = dev->netdev_ops->ndo_fix_features(dev, features);
5435 /* driver might be less strict about feature dependencies */
5436 features = netdev_fix_features(dev, features);
5438 if (dev->features == features)
5441 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5442 dev->features, features);
5444 if (dev->netdev_ops->ndo_set_features)
5445 err = dev->netdev_ops->ndo_set_features(dev, features);
5447 if (unlikely(err < 0)) {
5449 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5450 err, features, dev->features);
5451 /* return non-0 since some features might have changed and
5452 * it's better to fire a spurious notification than miss it
5458 dev->features = features;
5464 * netdev_update_features - recalculate device features
5465 * @dev: the device to check
5467 * Recalculate dev->features set and send notifications if it
5468 * has changed. Should be called after driver or hardware dependent
5469 * conditions might have changed that influence the features.
5471 void netdev_update_features(struct net_device *dev)
5473 if (__netdev_update_features(dev))
5474 netdev_features_change(dev);
5476 EXPORT_SYMBOL(netdev_update_features);
5479 * netdev_change_features - recalculate device features
5480 * @dev: the device to check
5482 * Recalculate dev->features set and send notifications even
5483 * if they have not changed. Should be called instead of
5484 * netdev_update_features() if also dev->vlan_features might
5485 * have changed to allow the changes to be propagated to stacked
5488 void netdev_change_features(struct net_device *dev)
5490 __netdev_update_features(dev);
5491 netdev_features_change(dev);
5493 EXPORT_SYMBOL(netdev_change_features);
5496 * netif_stacked_transfer_operstate - transfer operstate
5497 * @rootdev: the root or lower level device to transfer state from
5498 * @dev: the device to transfer operstate to
5500 * Transfer operational state from root to device. This is normally
5501 * called when a stacking relationship exists between the root
5502 * device and the device(a leaf device).
5504 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5505 struct net_device *dev)
5507 if (rootdev->operstate == IF_OPER_DORMANT)
5508 netif_dormant_on(dev);
5510 netif_dormant_off(dev);
5512 if (netif_carrier_ok(rootdev)) {
5513 if (!netif_carrier_ok(dev))
5514 netif_carrier_on(dev);
5516 if (netif_carrier_ok(dev))
5517 netif_carrier_off(dev);
5520 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5523 static int netif_alloc_rx_queues(struct net_device *dev)
5525 unsigned int i, count = dev->num_rx_queues;
5526 struct netdev_rx_queue *rx;
5530 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5532 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5537 for (i = 0; i < count; i++)
5543 static void netdev_init_one_queue(struct net_device *dev,
5544 struct netdev_queue *queue, void *_unused)
5546 /* Initialize queue lock */
5547 spin_lock_init(&queue->_xmit_lock);
5548 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5549 queue->xmit_lock_owner = -1;
5550 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5554 static int netif_alloc_netdev_queues(struct net_device *dev)
5556 unsigned int count = dev->num_tx_queues;
5557 struct netdev_queue *tx;
5561 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5563 pr_err("netdev: Unable to allocate %u tx queues.\n",
5569 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5570 spin_lock_init(&dev->tx_global_lock);
5576 * register_netdevice - register a network device
5577 * @dev: device to register
5579 * Take a completed network device structure and add it to the kernel
5580 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5581 * chain. 0 is returned on success. A negative errno code is returned
5582 * on a failure to set up the device, or if the name is a duplicate.
5584 * Callers must hold the rtnl semaphore. You may want
5585 * register_netdev() instead of this.
5588 * The locking appears insufficient to guarantee two parallel registers
5589 * will not get the same name.
5592 int register_netdevice(struct net_device *dev)
5595 struct net *net = dev_net(dev);
5597 BUG_ON(dev_boot_phase);
5602 /* When net_device's are persistent, this will be fatal. */
5603 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5606 spin_lock_init(&dev->addr_list_lock);
5607 netdev_set_addr_lockdep_class(dev);
5611 ret = dev_get_valid_name(dev, dev->name);
5615 /* Init, if this function is available */
5616 if (dev->netdev_ops->ndo_init) {
5617 ret = dev->netdev_ops->ndo_init(dev);
5625 dev->ifindex = dev_new_index(net);
5626 if (dev->iflink == -1)
5627 dev->iflink = dev->ifindex;
5629 /* Transfer changeable features to wanted_features and enable
5630 * software offloads (GSO and GRO).
5632 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5633 dev->features |= NETIF_F_SOFT_FEATURES;
5634 dev->wanted_features = dev->features & dev->hw_features;
5636 /* Turn on no cache copy if HW is doing checksum */
5637 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5638 if ((dev->features & NETIF_F_ALL_CSUM) &&
5639 !(dev->features & NETIF_F_NO_CSUM)) {
5640 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5641 dev->features |= NETIF_F_NOCACHE_COPY;
5644 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5646 dev->vlan_features |= NETIF_F_HIGHDMA;
5648 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5649 ret = notifier_to_errno(ret);
5653 ret = netdev_register_kobject(dev);
5656 dev->reg_state = NETREG_REGISTERED;
5658 __netdev_update_features(dev);
5661 * Default initial state at registry is that the
5662 * device is present.
5665 set_bit(__LINK_STATE_PRESENT, &dev->state);
5667 dev_init_scheduler(dev);
5669 list_netdevice(dev);
5670 add_device_randomness(dev->dev_addr, dev->addr_len);
5672 /* Notify protocols, that a new device appeared. */
5673 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5674 ret = notifier_to_errno(ret);
5676 rollback_registered(dev);
5677 dev->reg_state = NETREG_UNREGISTERED;
5680 * Prevent userspace races by waiting until the network
5681 * device is fully setup before sending notifications.
5683 if (!dev->rtnl_link_ops ||
5684 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5685 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5691 if (dev->netdev_ops->ndo_uninit)
5692 dev->netdev_ops->ndo_uninit(dev);
5695 EXPORT_SYMBOL(register_netdevice);
5698 * init_dummy_netdev - init a dummy network device for NAPI
5699 * @dev: device to init
5701 * This takes a network device structure and initialize the minimum
5702 * amount of fields so it can be used to schedule NAPI polls without
5703 * registering a full blown interface. This is to be used by drivers
5704 * that need to tie several hardware interfaces to a single NAPI
5705 * poll scheduler due to HW limitations.
5707 int init_dummy_netdev(struct net_device *dev)
5709 /* Clear everything. Note we don't initialize spinlocks
5710 * are they aren't supposed to be taken by any of the
5711 * NAPI code and this dummy netdev is supposed to be
5712 * only ever used for NAPI polls
5714 memset(dev, 0, sizeof(struct net_device));
5716 /* make sure we BUG if trying to hit standard
5717 * register/unregister code path
5719 dev->reg_state = NETREG_DUMMY;
5721 /* NAPI wants this */
5722 INIT_LIST_HEAD(&dev->napi_list);
5724 /* a dummy interface is started by default */
5725 set_bit(__LINK_STATE_PRESENT, &dev->state);
5726 set_bit(__LINK_STATE_START, &dev->state);
5728 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5729 * because users of this 'device' dont need to change
5735 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5739 * register_netdev - register a network device
5740 * @dev: device to register
5742 * Take a completed network device structure and add it to the kernel
5743 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5744 * chain. 0 is returned on success. A negative errno code is returned
5745 * on a failure to set up the device, or if the name is a duplicate.
5747 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5748 * and expands the device name if you passed a format string to
5751 int register_netdev(struct net_device *dev)
5756 err = register_netdevice(dev);
5760 EXPORT_SYMBOL(register_netdev);
5762 int netdev_refcnt_read(const struct net_device *dev)
5766 for_each_possible_cpu(i)
5767 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5770 EXPORT_SYMBOL(netdev_refcnt_read);
5773 * netdev_wait_allrefs - wait until all references are gone.
5775 * This is called when unregistering network devices.
5777 * Any protocol or device that holds a reference should register
5778 * for netdevice notification, and cleanup and put back the
5779 * reference if they receive an UNREGISTER event.
5780 * We can get stuck here if buggy protocols don't correctly
5783 static void netdev_wait_allrefs(struct net_device *dev)
5785 unsigned long rebroadcast_time, warning_time;
5788 linkwatch_forget_dev(dev);
5790 rebroadcast_time = warning_time = jiffies;
5791 refcnt = netdev_refcnt_read(dev);
5793 while (refcnt != 0) {
5794 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5797 /* Rebroadcast unregister notification */
5798 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5799 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5800 * should have already handle it the first time */
5802 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5804 /* We must not have linkwatch events
5805 * pending on unregister. If this
5806 * happens, we simply run the queue
5807 * unscheduled, resulting in a noop
5810 linkwatch_run_queue();
5815 rebroadcast_time = jiffies;
5820 refcnt = netdev_refcnt_read(dev);
5822 if (time_after(jiffies, warning_time + 10 * HZ)) {
5823 printk(KERN_EMERG "unregister_netdevice: "
5824 "waiting for %s to become free. Usage "
5827 warning_time = jiffies;
5836 * register_netdevice(x1);
5837 * register_netdevice(x2);
5839 * unregister_netdevice(y1);
5840 * unregister_netdevice(y2);
5846 * We are invoked by rtnl_unlock().
5847 * This allows us to deal with problems:
5848 * 1) We can delete sysfs objects which invoke hotplug
5849 * without deadlocking with linkwatch via keventd.
5850 * 2) Since we run with the RTNL semaphore not held, we can sleep
5851 * safely in order to wait for the netdev refcnt to drop to zero.
5853 * We must not return until all unregister events added during
5854 * the interval the lock was held have been completed.
5856 void netdev_run_todo(void)
5858 struct list_head list;
5860 /* Snapshot list, allow later requests */
5861 list_replace_init(&net_todo_list, &list);
5865 /* Wait for rcu callbacks to finish before attempting to drain
5866 * the device list. This usually avoids a 250ms wait.
5868 if (!list_empty(&list))
5871 while (!list_empty(&list)) {
5872 struct net_device *dev
5873 = list_first_entry(&list, struct net_device, todo_list);
5874 list_del(&dev->todo_list);
5876 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5877 printk(KERN_ERR "network todo '%s' but state %d\n",
5878 dev->name, dev->reg_state);
5883 dev->reg_state = NETREG_UNREGISTERED;
5885 netdev_wait_allrefs(dev);
5888 BUG_ON(netdev_refcnt_read(dev));
5889 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5890 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5891 WARN_ON(dev->dn_ptr);
5893 if (dev->destructor)
5894 dev->destructor(dev);
5896 /* Free network device */
5897 kobject_put(&dev->dev.kobj);
5901 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5902 * fields in the same order, with only the type differing.
5904 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5905 const struct net_device_stats *netdev_stats)
5907 #if BITS_PER_LONG == 64
5908 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5909 memcpy(stats64, netdev_stats, sizeof(*stats64));
5911 size_t i, n = sizeof(*stats64) / sizeof(u64);
5912 const unsigned long *src = (const unsigned long *)netdev_stats;
5913 u64 *dst = (u64 *)stats64;
5915 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5916 sizeof(*stats64) / sizeof(u64));
5917 for (i = 0; i < n; i++)
5923 * dev_get_stats - get network device statistics
5924 * @dev: device to get statistics from
5925 * @storage: place to store stats
5927 * Get network statistics from device. Return @storage.
5928 * The device driver may provide its own method by setting
5929 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5930 * otherwise the internal statistics structure is used.
5932 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5933 struct rtnl_link_stats64 *storage)
5935 const struct net_device_ops *ops = dev->netdev_ops;
5937 if (ops->ndo_get_stats64) {
5938 memset(storage, 0, sizeof(*storage));
5939 ops->ndo_get_stats64(dev, storage);
5940 } else if (ops->ndo_get_stats) {
5941 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5943 netdev_stats_to_stats64(storage, &dev->stats);
5945 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5948 EXPORT_SYMBOL(dev_get_stats);
5950 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5952 struct netdev_queue *queue = dev_ingress_queue(dev);
5954 #ifdef CONFIG_NET_CLS_ACT
5957 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5960 netdev_init_one_queue(dev, queue, NULL);
5961 queue->qdisc = &noop_qdisc;
5962 queue->qdisc_sleeping = &noop_qdisc;
5963 rcu_assign_pointer(dev->ingress_queue, queue);
5969 * alloc_netdev_mqs - allocate network device
5970 * @sizeof_priv: size of private data to allocate space for
5971 * @name: device name format string
5972 * @setup: callback to initialize device
5973 * @txqs: the number of TX subqueues to allocate
5974 * @rxqs: the number of RX subqueues to allocate
5976 * Allocates a struct net_device with private data area for driver use
5977 * and performs basic initialization. Also allocates subquue structs
5978 * for each queue on the device.
5980 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5981 void (*setup)(struct net_device *),
5982 unsigned int txqs, unsigned int rxqs)
5984 struct net_device *dev;
5986 struct net_device *p;
5988 BUG_ON(strlen(name) >= sizeof(dev->name));
5991 pr_err("alloc_netdev: Unable to allocate device "
5992 "with zero queues.\n");
5998 pr_err("alloc_netdev: Unable to allocate device "
5999 "with zero RX queues.\n");
6004 alloc_size = sizeof(struct net_device);
6006 /* ensure 32-byte alignment of private area */
6007 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6008 alloc_size += sizeof_priv;
6010 /* ensure 32-byte alignment of whole construct */
6011 alloc_size += NETDEV_ALIGN - 1;
6013 p = kzalloc(alloc_size, GFP_KERNEL);
6015 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
6019 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6020 dev->padded = (char *)dev - (char *)p;
6022 dev->pcpu_refcnt = alloc_percpu(int);
6023 if (!dev->pcpu_refcnt)
6026 if (dev_addr_init(dev))
6032 dev_net_set(dev, &init_net);
6034 dev->gso_max_size = GSO_MAX_SIZE;
6035 dev->gso_max_segs = GSO_MAX_SEGS;
6037 INIT_LIST_HEAD(&dev->napi_list);
6038 INIT_LIST_HEAD(&dev->unreg_list);
6039 INIT_LIST_HEAD(&dev->link_watch_list);
6040 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6043 dev->num_tx_queues = txqs;
6044 dev->real_num_tx_queues = txqs;
6045 if (netif_alloc_netdev_queues(dev))
6049 dev->num_rx_queues = rxqs;
6050 dev->real_num_rx_queues = rxqs;
6051 if (netif_alloc_rx_queues(dev))
6055 strcpy(dev->name, name);
6056 dev->group = INIT_NETDEV_GROUP;
6064 free_percpu(dev->pcpu_refcnt);
6074 EXPORT_SYMBOL(alloc_netdev_mqs);
6077 * free_netdev - free network device
6080 * This function does the last stage of destroying an allocated device
6081 * interface. The reference to the device object is released.
6082 * If this is the last reference then it will be freed.
6084 void free_netdev(struct net_device *dev)
6086 struct napi_struct *p, *n;
6088 release_net(dev_net(dev));
6095 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6097 /* Flush device addresses */
6098 dev_addr_flush(dev);
6100 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6103 free_percpu(dev->pcpu_refcnt);
6104 dev->pcpu_refcnt = NULL;
6106 /* Compatibility with error handling in drivers */
6107 if (dev->reg_state == NETREG_UNINITIALIZED) {
6108 kfree((char *)dev - dev->padded);
6112 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6113 dev->reg_state = NETREG_RELEASED;
6115 /* will free via device release */
6116 put_device(&dev->dev);
6118 EXPORT_SYMBOL(free_netdev);
6121 * synchronize_net - Synchronize with packet receive processing
6123 * Wait for packets currently being received to be done.
6124 * Does not block later packets from starting.
6126 void synchronize_net(void)
6129 if (rtnl_is_locked())
6130 synchronize_rcu_expedited();
6134 EXPORT_SYMBOL(synchronize_net);
6137 * unregister_netdevice_queue - remove device from the kernel
6141 * This function shuts down a device interface and removes it
6142 * from the kernel tables.
6143 * If head not NULL, device is queued to be unregistered later.
6145 * Callers must hold the rtnl semaphore. You may want
6146 * unregister_netdev() instead of this.
6149 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6154 list_move_tail(&dev->unreg_list, head);
6156 rollback_registered(dev);
6157 /* Finish processing unregister after unlock */
6161 EXPORT_SYMBOL(unregister_netdevice_queue);
6164 * unregister_netdevice_many - unregister many devices
6165 * @head: list of devices
6167 void unregister_netdevice_many(struct list_head *head)
6169 struct net_device *dev;
6171 if (!list_empty(head)) {
6172 rollback_registered_many(head);
6173 list_for_each_entry(dev, head, unreg_list)
6177 EXPORT_SYMBOL(unregister_netdevice_many);
6180 * unregister_netdev - remove device from the kernel
6183 * This function shuts down a device interface and removes it
6184 * from the kernel tables.
6186 * This is just a wrapper for unregister_netdevice that takes
6187 * the rtnl semaphore. In general you want to use this and not
6188 * unregister_netdevice.
6190 void unregister_netdev(struct net_device *dev)
6193 unregister_netdevice(dev);
6196 EXPORT_SYMBOL(unregister_netdev);
6199 * dev_change_net_namespace - move device to different nethost namespace
6201 * @net: network namespace
6202 * @pat: If not NULL name pattern to try if the current device name
6203 * is already taken in the destination network namespace.
6205 * This function shuts down a device interface and moves it
6206 * to a new network namespace. On success 0 is returned, on
6207 * a failure a netagive errno code is returned.
6209 * Callers must hold the rtnl semaphore.
6212 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6218 /* Don't allow namespace local devices to be moved. */
6220 if (dev->features & NETIF_F_NETNS_LOCAL)
6223 /* Ensure the device has been registrered */
6225 if (dev->reg_state != NETREG_REGISTERED)
6228 /* Get out if there is nothing todo */
6230 if (net_eq(dev_net(dev), net))
6233 /* Pick the destination device name, and ensure
6234 * we can use it in the destination network namespace.
6237 if (__dev_get_by_name(net, dev->name)) {
6238 /* We get here if we can't use the current device name */
6241 if (dev_get_valid_name(dev, pat) < 0)
6246 * And now a mini version of register_netdevice unregister_netdevice.
6249 /* If device is running close it first. */
6252 /* And unlink it from device chain */
6254 unlist_netdevice(dev);
6258 /* Shutdown queueing discipline. */
6261 /* Notify protocols, that we are about to destroy
6262 this device. They should clean all the things.
6264 Note that dev->reg_state stays at NETREG_REGISTERED.
6265 This is wanted because this way 8021q and macvlan know
6266 the device is just moving and can keep their slaves up.
6268 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6269 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6270 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6273 * Flush the unicast and multicast chains
6278 /* Actually switch the network namespace */
6279 dev_net_set(dev, net);
6281 /* If there is an ifindex conflict assign a new one */
6282 if (__dev_get_by_index(net, dev->ifindex)) {
6283 int iflink = (dev->iflink == dev->ifindex);
6284 dev->ifindex = dev_new_index(net);
6286 dev->iflink = dev->ifindex;
6289 /* Fixup kobjects */
6290 err = device_rename(&dev->dev, dev->name);
6293 /* Add the device back in the hashes */
6294 list_netdevice(dev);
6296 /* Notify protocols, that a new device appeared. */
6297 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6300 * Prevent userspace races by waiting until the network
6301 * device is fully setup before sending notifications.
6303 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6310 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6312 static int dev_cpu_callback(struct notifier_block *nfb,
6313 unsigned long action,
6316 struct sk_buff **list_skb;
6317 struct sk_buff *skb;
6318 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6319 struct softnet_data *sd, *oldsd;
6321 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6324 local_irq_disable();
6325 cpu = smp_processor_id();
6326 sd = &per_cpu(softnet_data, cpu);
6327 oldsd = &per_cpu(softnet_data, oldcpu);
6329 /* Find end of our completion_queue. */
6330 list_skb = &sd->completion_queue;
6332 list_skb = &(*list_skb)->next;
6333 /* Append completion queue from offline CPU. */
6334 *list_skb = oldsd->completion_queue;
6335 oldsd->completion_queue = NULL;
6337 /* Append output queue from offline CPU. */
6338 if (oldsd->output_queue) {
6339 *sd->output_queue_tailp = oldsd->output_queue;
6340 sd->output_queue_tailp = oldsd->output_queue_tailp;
6341 oldsd->output_queue = NULL;
6342 oldsd->output_queue_tailp = &oldsd->output_queue;
6344 /* Append NAPI poll list from offline CPU, with one exception :
6345 * process_backlog() must be called by cpu owning percpu backlog.
6346 * We properly handle process_queue & input_pkt_queue later.
6348 while (!list_empty(&oldsd->poll_list)) {
6349 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
6353 list_del_init(&napi->poll_list);
6354 if (napi->poll == process_backlog)
6357 ____napi_schedule(sd, napi);
6360 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6363 /* Process offline CPU's input_pkt_queue */
6364 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6366 input_queue_head_incr(oldsd);
6368 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
6370 input_queue_head_incr(oldsd);
6378 * netdev_increment_features - increment feature set by one
6379 * @all: current feature set
6380 * @one: new feature set
6381 * @mask: mask feature set
6383 * Computes a new feature set after adding a device with feature set
6384 * @one to the master device with current feature set @all. Will not
6385 * enable anything that is off in @mask. Returns the new feature set.
6387 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6389 if (mask & NETIF_F_GEN_CSUM)
6390 mask |= NETIF_F_ALL_CSUM;
6391 mask |= NETIF_F_VLAN_CHALLENGED;
6393 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6394 all &= one | ~NETIF_F_ALL_FOR_ALL;
6396 /* If device needs checksumming, downgrade to it. */
6397 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6398 all &= ~NETIF_F_NO_CSUM;
6400 /* If one device supports hw checksumming, set for all. */
6401 if (all & NETIF_F_GEN_CSUM)
6402 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6406 EXPORT_SYMBOL(netdev_increment_features);
6408 static struct hlist_head *netdev_create_hash(void)
6411 struct hlist_head *hash;
6413 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6415 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6416 INIT_HLIST_HEAD(&hash[i]);
6421 /* Initialize per network namespace state */
6422 static int __net_init netdev_init(struct net *net)
6424 if (net != &init_net)
6425 INIT_LIST_HEAD(&net->dev_base_head);
6427 net->dev_name_head = netdev_create_hash();
6428 if (net->dev_name_head == NULL)
6431 net->dev_index_head = netdev_create_hash();
6432 if (net->dev_index_head == NULL)
6438 kfree(net->dev_name_head);
6444 * netdev_drivername - network driver for the device
6445 * @dev: network device
6447 * Determine network driver for device.
6449 const char *netdev_drivername(const struct net_device *dev)
6451 const struct device_driver *driver;
6452 const struct device *parent;
6453 const char *empty = "";
6455 parent = dev->dev.parent;
6459 driver = parent->driver;
6460 if (driver && driver->name)
6461 return driver->name;
6465 int __netdev_printk(const char *level, const struct net_device *dev,
6466 struct va_format *vaf)
6470 if (dev && dev->dev.parent)
6471 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6472 netdev_name(dev), vaf);
6474 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6476 r = printk("%s(NULL net_device): %pV", level, vaf);
6480 EXPORT_SYMBOL(__netdev_printk);
6482 int netdev_printk(const char *level, const struct net_device *dev,
6483 const char *format, ...)
6485 struct va_format vaf;
6489 va_start(args, format);
6494 r = __netdev_printk(level, dev, &vaf);
6499 EXPORT_SYMBOL(netdev_printk);
6501 #define define_netdev_printk_level(func, level) \
6502 int func(const struct net_device *dev, const char *fmt, ...) \
6505 struct va_format vaf; \
6508 va_start(args, fmt); \
6513 r = __netdev_printk(level, dev, &vaf); \
6518 EXPORT_SYMBOL(func);
6520 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6521 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6522 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6523 define_netdev_printk_level(netdev_err, KERN_ERR);
6524 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6525 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6526 define_netdev_printk_level(netdev_info, KERN_INFO);
6528 static void __net_exit netdev_exit(struct net *net)
6530 kfree(net->dev_name_head);
6531 kfree(net->dev_index_head);
6534 static struct pernet_operations __net_initdata netdev_net_ops = {
6535 .init = netdev_init,
6536 .exit = netdev_exit,
6539 static void __net_exit default_device_exit(struct net *net)
6541 struct net_device *dev, *aux;
6543 * Push all migratable network devices back to the
6544 * initial network namespace
6547 for_each_netdev_safe(net, dev, aux) {
6549 char fb_name[IFNAMSIZ];
6551 /* Ignore unmoveable devices (i.e. loopback) */
6552 if (dev->features & NETIF_F_NETNS_LOCAL)
6555 /* Leave virtual devices for the generic cleanup */
6556 if (dev->rtnl_link_ops)
6559 /* Push remaining network devices to init_net */
6560 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6561 err = dev_change_net_namespace(dev, &init_net, fb_name);
6563 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6564 __func__, dev->name, err);
6571 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6573 /* At exit all network devices most be removed from a network
6574 * namespace. Do this in the reverse order of registration.
6575 * Do this across as many network namespaces as possible to
6576 * improve batching efficiency.
6578 struct net_device *dev;
6580 LIST_HEAD(dev_kill_list);
6583 list_for_each_entry(net, net_list, exit_list) {
6584 for_each_netdev_reverse(net, dev) {
6585 if (dev->rtnl_link_ops)
6586 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6588 unregister_netdevice_queue(dev, &dev_kill_list);
6591 unregister_netdevice_many(&dev_kill_list);
6592 list_del(&dev_kill_list);
6596 static struct pernet_operations __net_initdata default_device_ops = {
6597 .exit = default_device_exit,
6598 .exit_batch = default_device_exit_batch,
6602 * Initialize the DEV module. At boot time this walks the device list and
6603 * unhooks any devices that fail to initialise (normally hardware not
6604 * present) and leaves us with a valid list of present and active devices.
6609 * This is called single threaded during boot, so no need
6610 * to take the rtnl semaphore.
6612 static int __init net_dev_init(void)
6614 int i, rc = -ENOMEM;
6616 BUG_ON(!dev_boot_phase);
6618 if (dev_proc_init())
6621 if (netdev_kobject_init())
6624 INIT_LIST_HEAD(&ptype_all);
6625 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6626 INIT_LIST_HEAD(&ptype_base[i]);
6628 if (register_pernet_subsys(&netdev_net_ops))
6632 * Initialise the packet receive queues.
6635 for_each_possible_cpu(i) {
6636 struct softnet_data *sd = &per_cpu(softnet_data, i);
6638 memset(sd, 0, sizeof(*sd));
6639 skb_queue_head_init(&sd->input_pkt_queue);
6640 skb_queue_head_init(&sd->process_queue);
6641 sd->completion_queue = NULL;
6642 INIT_LIST_HEAD(&sd->poll_list);
6643 sd->output_queue = NULL;
6644 sd->output_queue_tailp = &sd->output_queue;
6646 sd->csd.func = rps_trigger_softirq;
6652 sd->backlog.poll = process_backlog;
6653 sd->backlog.weight = weight_p;
6654 sd->backlog.gro_list = NULL;
6655 sd->backlog.gro_count = 0;
6660 /* The loopback device is special if any other network devices
6661 * is present in a network namespace the loopback device must
6662 * be present. Since we now dynamically allocate and free the
6663 * loopback device ensure this invariant is maintained by
6664 * keeping the loopback device as the first device on the
6665 * list of network devices. Ensuring the loopback devices
6666 * is the first device that appears and the last network device
6669 if (register_pernet_device(&loopback_net_ops))
6672 if (register_pernet_device(&default_device_ops))
6675 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6676 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6678 hotcpu_notifier(dev_cpu_callback, 0);
6686 subsys_initcall(net_dev_init);
6688 static int __init initialize_hashrnd(void)
6690 get_random_bytes(&hashrnd, sizeof(hashrnd));
6694 late_initcall_sync(initialize_hashrnd);