2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
135 #include <linux/cpu_rmap.h>
136 #include <linux/if_tunnel.h>
137 #include <linux/if_pppox.h>
138 #include <linux/ppp_defs.h>
139 #include <linux/net_tstamp.h>
141 #include "net-sysfs.h"
143 /* Instead of increasing this, you should create a hash table. */
144 #define MAX_GRO_SKBS 8
146 /* This should be increased if a protocol with a bigger head is added. */
147 #define GRO_MAX_HEAD (MAX_HEADER + 128)
150 * The list of packet types we will receive (as opposed to discard)
151 * and the routines to invoke.
153 * Why 16. Because with 16 the only overlap we get on a hash of the
154 * low nibble of the protocol value is RARP/SNAP/X.25.
156 * NOTE: That is no longer true with the addition of VLAN tags. Not
157 * sure which should go first, but I bet it won't make much
158 * difference if we are running VLANs. The good news is that
159 * this protocol won't be in the list unless compiled in, so
160 * the average user (w/out VLANs) will not be adversely affected.
177 #define PTYPE_HASH_SIZE (16)
178 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
180 static DEFINE_SPINLOCK(ptype_lock);
181 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
182 static struct list_head ptype_all __read_mostly; /* Taps */
185 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
188 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
190 * Writers must hold the rtnl semaphore while they loop through the
191 * dev_base_head list, and hold dev_base_lock for writing when they do the
192 * actual updates. This allows pure readers to access the list even
193 * while a writer is preparing to update it.
195 * To put it another way, dev_base_lock is held for writing only to
196 * protect against pure readers; the rtnl semaphore provides the
197 * protection against other writers.
199 * See, for example usages, register_netdevice() and
200 * unregister_netdevice(), which must be called with the rtnl
203 DEFINE_RWLOCK(dev_base_lock);
204 EXPORT_SYMBOL(dev_base_lock);
206 static inline void dev_base_seq_inc(struct net *net)
208 while (++net->dev_base_seq == 0);
211 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
213 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
214 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
217 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
219 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
222 static inline void rps_lock(struct softnet_data *sd)
225 spin_lock(&sd->input_pkt_queue.lock);
229 static inline void rps_unlock(struct softnet_data *sd)
232 spin_unlock(&sd->input_pkt_queue.lock);
236 /* Device list insertion */
237 static int list_netdevice(struct net_device *dev)
239 struct net *net = dev_net(dev);
243 write_lock_bh(&dev_base_lock);
244 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
245 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
246 hlist_add_head_rcu(&dev->index_hlist,
247 dev_index_hash(net, dev->ifindex));
248 write_unlock_bh(&dev_base_lock);
250 dev_base_seq_inc(net);
255 /* Device list removal
256 * caller must respect a RCU grace period before freeing/reusing dev
258 static void unlist_netdevice(struct net_device *dev)
262 /* Unlink dev from the device chain */
263 write_lock_bh(&dev_base_lock);
264 list_del_rcu(&dev->dev_list);
265 hlist_del_rcu(&dev->name_hlist);
266 hlist_del_rcu(&dev->index_hlist);
267 write_unlock_bh(&dev_base_lock);
269 dev_base_seq_inc(dev_net(dev));
276 static RAW_NOTIFIER_HEAD(netdev_chain);
279 * Device drivers call our routines to queue packets here. We empty the
280 * queue in the local softnet handler.
283 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
284 EXPORT_PER_CPU_SYMBOL(softnet_data);
286 #ifdef CONFIG_LOCKDEP
288 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
289 * according to dev->type
291 static const unsigned short netdev_lock_type[] =
292 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
293 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
294 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
295 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
296 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
297 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
298 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
299 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
300 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
301 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
302 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
303 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
304 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
305 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
306 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
307 ARPHRD_VOID, ARPHRD_NONE};
309 static const char *const netdev_lock_name[] =
310 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
311 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
312 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
313 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
314 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
315 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
316 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
317 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
318 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
319 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
320 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
321 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
322 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
323 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
324 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
325 "_xmit_VOID", "_xmit_NONE"};
327 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
328 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
330 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
334 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
335 if (netdev_lock_type[i] == dev_type)
337 /* the last key is used by default */
338 return ARRAY_SIZE(netdev_lock_type) - 1;
341 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
342 unsigned short dev_type)
346 i = netdev_lock_pos(dev_type);
347 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
348 netdev_lock_name[i]);
351 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 i = netdev_lock_pos(dev->type);
356 lockdep_set_class_and_name(&dev->addr_list_lock,
357 &netdev_addr_lock_key[i],
358 netdev_lock_name[i]);
361 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
362 unsigned short dev_type)
365 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
370 /*******************************************************************************
372 Protocol management and registration routines
374 *******************************************************************************/
377 * Add a protocol ID to the list. Now that the input handler is
378 * smarter we can dispense with all the messy stuff that used to be
381 * BEWARE!!! Protocol handlers, mangling input packets,
382 * MUST BE last in hash buckets and checking protocol handlers
383 * MUST start from promiscuous ptype_all chain in net_bh.
384 * It is true now, do not change it.
385 * Explanation follows: if protocol handler, mangling packet, will
386 * be the first on list, it is not able to sense, that packet
387 * is cloned and should be copied-on-write, so that it will
388 * change it and subsequent readers will get broken packet.
392 static inline struct list_head *ptype_head(const struct packet_type *pt)
394 if (pt->type == htons(ETH_P_ALL))
397 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
401 * dev_add_pack - add packet handler
402 * @pt: packet type declaration
404 * Add a protocol handler to the networking stack. The passed &packet_type
405 * is linked into kernel lists and may not be freed until it has been
406 * removed from the kernel lists.
408 * This call does not sleep therefore it can not
409 * guarantee all CPU's that are in middle of receiving packets
410 * will see the new packet type (until the next received packet).
413 void dev_add_pack(struct packet_type *pt)
415 struct list_head *head = ptype_head(pt);
417 spin_lock(&ptype_lock);
418 list_add_rcu(&pt->list, head);
419 spin_unlock(&ptype_lock);
421 EXPORT_SYMBOL(dev_add_pack);
424 * __dev_remove_pack - remove packet handler
425 * @pt: packet type declaration
427 * Remove a protocol handler that was previously added to the kernel
428 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
429 * from the kernel lists and can be freed or reused once this function
432 * The packet type might still be in use by receivers
433 * and must not be freed until after all the CPU's have gone
434 * through a quiescent state.
436 void __dev_remove_pack(struct packet_type *pt)
438 struct list_head *head = ptype_head(pt);
439 struct packet_type *pt1;
441 spin_lock(&ptype_lock);
443 list_for_each_entry(pt1, head, list) {
445 list_del_rcu(&pt->list);
450 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
452 spin_unlock(&ptype_lock);
454 EXPORT_SYMBOL(__dev_remove_pack);
457 * dev_remove_pack - remove packet handler
458 * @pt: packet type declaration
460 * Remove a protocol handler that was previously added to the kernel
461 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
462 * from the kernel lists and can be freed or reused once this function
465 * This call sleeps to guarantee that no CPU is looking at the packet
468 void dev_remove_pack(struct packet_type *pt)
470 __dev_remove_pack(pt);
474 EXPORT_SYMBOL(dev_remove_pack);
476 /******************************************************************************
478 Device Boot-time Settings Routines
480 *******************************************************************************/
482 /* Boot time configuration table */
483 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
486 * netdev_boot_setup_add - add new setup entry
487 * @name: name of the device
488 * @map: configured settings for the device
490 * Adds new setup entry to the dev_boot_setup list. The function
491 * returns 0 on error and 1 on success. This is a generic routine to
494 static int netdev_boot_setup_add(char *name, struct ifmap *map)
496 struct netdev_boot_setup *s;
500 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
501 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
502 memset(s[i].name, 0, sizeof(s[i].name));
503 strlcpy(s[i].name, name, IFNAMSIZ);
504 memcpy(&s[i].map, map, sizeof(s[i].map));
509 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
513 * netdev_boot_setup_check - check boot time settings
514 * @dev: the netdevice
516 * Check boot time settings for the device.
517 * The found settings are set for the device to be used
518 * later in the device probing.
519 * Returns 0 if no settings found, 1 if they are.
521 int netdev_boot_setup_check(struct net_device *dev)
523 struct netdev_boot_setup *s = dev_boot_setup;
526 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
527 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
528 !strcmp(dev->name, s[i].name)) {
529 dev->irq = s[i].map.irq;
530 dev->base_addr = s[i].map.base_addr;
531 dev->mem_start = s[i].map.mem_start;
532 dev->mem_end = s[i].map.mem_end;
538 EXPORT_SYMBOL(netdev_boot_setup_check);
542 * netdev_boot_base - get address from boot time settings
543 * @prefix: prefix for network device
544 * @unit: id for network device
546 * Check boot time settings for the base address of device.
547 * The found settings are set for the device to be used
548 * later in the device probing.
549 * Returns 0 if no settings found.
551 unsigned long netdev_boot_base(const char *prefix, int unit)
553 const struct netdev_boot_setup *s = dev_boot_setup;
557 sprintf(name, "%s%d", prefix, unit);
560 * If device already registered then return base of 1
561 * to indicate not to probe for this interface
563 if (__dev_get_by_name(&init_net, name))
566 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
567 if (!strcmp(name, s[i].name))
568 return s[i].map.base_addr;
573 * Saves at boot time configured settings for any netdevice.
575 int __init netdev_boot_setup(char *str)
580 str = get_options(str, ARRAY_SIZE(ints), ints);
585 memset(&map, 0, sizeof(map));
589 map.base_addr = ints[2];
591 map.mem_start = ints[3];
593 map.mem_end = ints[4];
595 /* Add new entry to the list */
596 return netdev_boot_setup_add(str, &map);
599 __setup("netdev=", netdev_boot_setup);
601 /*******************************************************************************
603 Device Interface Subroutines
605 *******************************************************************************/
608 * __dev_get_by_name - find a device by its name
609 * @net: the applicable net namespace
610 * @name: name to find
612 * Find an interface by name. Must be called under RTNL semaphore
613 * or @dev_base_lock. If the name is found a pointer to the device
614 * is returned. If the name is not found then %NULL is returned. The
615 * reference counters are not incremented so the caller must be
616 * careful with locks.
619 struct net_device *__dev_get_by_name(struct net *net, const char *name)
621 struct hlist_node *p;
622 struct net_device *dev;
623 struct hlist_head *head = dev_name_hash(net, name);
625 hlist_for_each_entry(dev, p, head, name_hlist)
626 if (!strncmp(dev->name, name, IFNAMSIZ))
631 EXPORT_SYMBOL(__dev_get_by_name);
634 * dev_get_by_name_rcu - find a device by its name
635 * @net: the applicable net namespace
636 * @name: name to find
638 * Find an interface by name.
639 * If the name is found a pointer to the device is returned.
640 * If the name is not found then %NULL is returned.
641 * The reference counters are not incremented so the caller must be
642 * careful with locks. The caller must hold RCU lock.
645 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
647 struct hlist_node *p;
648 struct net_device *dev;
649 struct hlist_head *head = dev_name_hash(net, name);
651 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
652 if (!strncmp(dev->name, name, IFNAMSIZ))
657 EXPORT_SYMBOL(dev_get_by_name_rcu);
660 * dev_get_by_name - find a device by its name
661 * @net: the applicable net namespace
662 * @name: name to find
664 * Find an interface by name. This can be called from any
665 * context and does its own locking. The returned handle has
666 * the usage count incremented and the caller must use dev_put() to
667 * release it when it is no longer needed. %NULL is returned if no
668 * matching device is found.
671 struct net_device *dev_get_by_name(struct net *net, const char *name)
673 struct net_device *dev;
676 dev = dev_get_by_name_rcu(net, name);
682 EXPORT_SYMBOL(dev_get_by_name);
685 * __dev_get_by_index - find a device by its ifindex
686 * @net: the applicable net namespace
687 * @ifindex: index of device
689 * Search for an interface by index. Returns %NULL if the device
690 * is not found or a pointer to the device. The device has not
691 * had its reference counter increased so the caller must be careful
692 * about locking. The caller must hold either the RTNL semaphore
696 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
698 struct hlist_node *p;
699 struct net_device *dev;
700 struct hlist_head *head = dev_index_hash(net, ifindex);
702 hlist_for_each_entry(dev, p, head, index_hlist)
703 if (dev->ifindex == ifindex)
708 EXPORT_SYMBOL(__dev_get_by_index);
711 * dev_get_by_index_rcu - find a device by its ifindex
712 * @net: the applicable net namespace
713 * @ifindex: index of device
715 * Search for an interface by index. Returns %NULL if the device
716 * is not found or a pointer to the device. The device has not
717 * had its reference counter increased so the caller must be careful
718 * about locking. The caller must hold RCU lock.
721 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
723 struct hlist_node *p;
724 struct net_device *dev;
725 struct hlist_head *head = dev_index_hash(net, ifindex);
727 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
728 if (dev->ifindex == ifindex)
733 EXPORT_SYMBOL(dev_get_by_index_rcu);
737 * dev_get_by_index - find a device by its ifindex
738 * @net: the applicable net namespace
739 * @ifindex: index of device
741 * Search for an interface by index. Returns NULL if the device
742 * is not found or a pointer to the device. The device returned has
743 * had a reference added and the pointer is safe until the user calls
744 * dev_put to indicate they have finished with it.
747 struct net_device *dev_get_by_index(struct net *net, int ifindex)
749 struct net_device *dev;
752 dev = dev_get_by_index_rcu(net, ifindex);
758 EXPORT_SYMBOL(dev_get_by_index);
761 * dev_getbyhwaddr_rcu - find a device by its hardware address
762 * @net: the applicable net namespace
763 * @type: media type of device
764 * @ha: hardware address
766 * Search for an interface by MAC address. Returns NULL if the device
767 * is not found or a pointer to the device.
768 * The caller must hold RCU or RTNL.
769 * The returned device has not had its ref count increased
770 * and the caller must therefore be careful about locking
774 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
777 struct net_device *dev;
779 for_each_netdev_rcu(net, dev)
780 if (dev->type == type &&
781 !memcmp(dev->dev_addr, ha, dev->addr_len))
786 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
788 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
790 struct net_device *dev;
793 for_each_netdev(net, dev)
794 if (dev->type == type)
799 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
801 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
803 struct net_device *dev, *ret = NULL;
806 for_each_netdev_rcu(net, dev)
807 if (dev->type == type) {
815 EXPORT_SYMBOL(dev_getfirstbyhwtype);
818 * dev_get_by_flags_rcu - find any device with given flags
819 * @net: the applicable net namespace
820 * @if_flags: IFF_* values
821 * @mask: bitmask of bits in if_flags to check
823 * Search for any interface with the given flags. Returns NULL if a device
824 * is not found or a pointer to the device. Must be called inside
825 * rcu_read_lock(), and result refcount is unchanged.
828 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
831 struct net_device *dev, *ret;
834 for_each_netdev_rcu(net, dev) {
835 if (((dev->flags ^ if_flags) & mask) == 0) {
842 EXPORT_SYMBOL(dev_get_by_flags_rcu);
845 * dev_valid_name - check if name is okay for network device
848 * Network device names need to be valid file names to
849 * to allow sysfs to work. We also disallow any kind of
852 int dev_valid_name(const char *name)
856 if (strlen(name) >= IFNAMSIZ)
858 if (!strcmp(name, ".") || !strcmp(name, ".."))
862 if (*name == '/' || isspace(*name))
868 EXPORT_SYMBOL(dev_valid_name);
871 * __dev_alloc_name - allocate a name for a device
872 * @net: network namespace to allocate the device name in
873 * @name: name format string
874 * @buf: scratch buffer and result name string
876 * Passed a format string - eg "lt%d" it will try and find a suitable
877 * id. It scans list of devices to build up a free map, then chooses
878 * the first empty slot. The caller must hold the dev_base or rtnl lock
879 * while allocating the name and adding the device in order to avoid
881 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
882 * Returns the number of the unit assigned or a negative errno code.
885 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
889 const int max_netdevices = 8*PAGE_SIZE;
890 unsigned long *inuse;
891 struct net_device *d;
893 p = strnchr(name, IFNAMSIZ-1, '%');
896 * Verify the string as this thing may have come from
897 * the user. There must be either one "%d" and no other "%"
900 if (p[1] != 'd' || strchr(p + 2, '%'))
903 /* Use one page as a bit array of possible slots */
904 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
908 for_each_netdev(net, d) {
909 if (!sscanf(d->name, name, &i))
911 if (i < 0 || i >= max_netdevices)
914 /* avoid cases where sscanf is not exact inverse of printf */
915 snprintf(buf, IFNAMSIZ, name, i);
916 if (!strncmp(buf, d->name, IFNAMSIZ))
920 i = find_first_zero_bit(inuse, max_netdevices);
921 free_page((unsigned long) inuse);
925 snprintf(buf, IFNAMSIZ, name, i);
926 if (!__dev_get_by_name(net, buf))
929 /* It is possible to run out of possible slots
930 * when the name is long and there isn't enough space left
931 * for the digits, or if all bits are used.
937 * dev_alloc_name - allocate a name for a device
939 * @name: name format string
941 * Passed a format string - eg "lt%d" it will try and find a suitable
942 * id. It scans list of devices to build up a free map, then chooses
943 * the first empty slot. The caller must hold the dev_base or rtnl lock
944 * while allocating the name and adding the device in order to avoid
946 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
947 * Returns the number of the unit assigned or a negative errno code.
950 int dev_alloc_name(struct net_device *dev, const char *name)
956 BUG_ON(!dev_net(dev));
958 ret = __dev_alloc_name(net, name, buf);
960 strlcpy(dev->name, buf, IFNAMSIZ);
963 EXPORT_SYMBOL(dev_alloc_name);
965 static int dev_get_valid_name(struct net_device *dev, const char *name)
969 BUG_ON(!dev_net(dev));
972 if (!dev_valid_name(name))
975 if (strchr(name, '%'))
976 return dev_alloc_name(dev, name);
977 else if (__dev_get_by_name(net, name))
979 else if (dev->name != name)
980 strlcpy(dev->name, name, IFNAMSIZ);
986 * dev_change_name - change name of a device
988 * @newname: name (or format string) must be at least IFNAMSIZ
990 * Change name of a device, can pass format strings "eth%d".
993 int dev_change_name(struct net_device *dev, const char *newname)
995 char oldname[IFNAMSIZ];
1001 BUG_ON(!dev_net(dev));
1004 if (dev->flags & IFF_UP)
1007 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1010 memcpy(oldname, dev->name, IFNAMSIZ);
1012 err = dev_get_valid_name(dev, newname);
1017 ret = device_rename(&dev->dev, dev->name);
1019 memcpy(dev->name, oldname, IFNAMSIZ);
1023 write_lock_bh(&dev_base_lock);
1024 hlist_del_rcu(&dev->name_hlist);
1025 write_unlock_bh(&dev_base_lock);
1029 write_lock_bh(&dev_base_lock);
1030 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1031 write_unlock_bh(&dev_base_lock);
1033 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1034 ret = notifier_to_errno(ret);
1037 /* err >= 0 after dev_alloc_name() or stores the first errno */
1040 memcpy(dev->name, oldname, IFNAMSIZ);
1044 "%s: name change rollback failed: %d.\n",
1053 * dev_set_alias - change ifalias of a device
1055 * @alias: name up to IFALIASZ
1056 * @len: limit of bytes to copy from info
1058 * Set ifalias for a device,
1060 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1066 if (len >= IFALIASZ)
1071 kfree(dev->ifalias);
1072 dev->ifalias = NULL;
1077 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1080 dev->ifalias = new_ifalias;
1082 strlcpy(dev->ifalias, alias, len+1);
1088 * netdev_features_change - device changes features
1089 * @dev: device to cause notification
1091 * Called to indicate a device has changed features.
1093 void netdev_features_change(struct net_device *dev)
1095 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1097 EXPORT_SYMBOL(netdev_features_change);
1100 * netdev_state_change - device changes state
1101 * @dev: device to cause notification
1103 * Called to indicate a device has changed state. This function calls
1104 * the notifier chains for netdev_chain and sends a NEWLINK message
1105 * to the routing socket.
1107 void netdev_state_change(struct net_device *dev)
1109 if (dev->flags & IFF_UP) {
1110 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1111 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1114 EXPORT_SYMBOL(netdev_state_change);
1116 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1118 return call_netdevice_notifiers(event, dev);
1120 EXPORT_SYMBOL(netdev_bonding_change);
1123 * dev_load - load a network module
1124 * @net: the applicable net namespace
1125 * @name: name of interface
1127 * If a network interface is not present and the process has suitable
1128 * privileges this function loads the module. If module loading is not
1129 * available in this kernel then it becomes a nop.
1132 void dev_load(struct net *net, const char *name)
1134 struct net_device *dev;
1138 dev = dev_get_by_name_rcu(net, name);
1142 if (no_module && capable(CAP_NET_ADMIN))
1143 no_module = request_module("netdev-%s", name);
1144 if (no_module && capable(CAP_SYS_MODULE)) {
1145 if (!request_module("%s", name))
1146 pr_err("Loading kernel module for a network device "
1147 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1151 EXPORT_SYMBOL(dev_load);
1153 static int __dev_open(struct net_device *dev)
1155 const struct net_device_ops *ops = dev->netdev_ops;
1160 if (!netif_device_present(dev))
1163 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1164 ret = notifier_to_errno(ret);
1168 set_bit(__LINK_STATE_START, &dev->state);
1170 if (ops->ndo_validate_addr)
1171 ret = ops->ndo_validate_addr(dev);
1173 if (!ret && ops->ndo_open)
1174 ret = ops->ndo_open(dev);
1177 clear_bit(__LINK_STATE_START, &dev->state);
1179 dev->flags |= IFF_UP;
1180 net_dmaengine_get();
1181 dev_set_rx_mode(dev);
1183 add_device_randomness(dev->dev_addr, dev->addr_len);
1190 * dev_open - prepare an interface for use.
1191 * @dev: device to open
1193 * Takes a device from down to up state. The device's private open
1194 * function is invoked and then the multicast lists are loaded. Finally
1195 * the device is moved into the up state and a %NETDEV_UP message is
1196 * sent to the netdev notifier chain.
1198 * Calling this function on an active interface is a nop. On a failure
1199 * a negative errno code is returned.
1201 int dev_open(struct net_device *dev)
1205 if (dev->flags & IFF_UP)
1208 ret = __dev_open(dev);
1212 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1213 call_netdevice_notifiers(NETDEV_UP, dev);
1217 EXPORT_SYMBOL(dev_open);
1219 static int __dev_close_many(struct list_head *head)
1221 struct net_device *dev;
1226 list_for_each_entry(dev, head, unreg_list) {
1227 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1229 clear_bit(__LINK_STATE_START, &dev->state);
1231 /* Synchronize to scheduled poll. We cannot touch poll list, it
1232 * can be even on different cpu. So just clear netif_running().
1234 * dev->stop() will invoke napi_disable() on all of it's
1235 * napi_struct instances on this device.
1237 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1240 dev_deactivate_many(head);
1242 list_for_each_entry(dev, head, unreg_list) {
1243 const struct net_device_ops *ops = dev->netdev_ops;
1246 * Call the device specific close. This cannot fail.
1247 * Only if device is UP
1249 * We allow it to be called even after a DETACH hot-plug
1255 dev->flags &= ~IFF_UP;
1256 net_dmaengine_put();
1262 static int __dev_close(struct net_device *dev)
1267 list_add(&dev->unreg_list, &single);
1268 retval = __dev_close_many(&single);
1273 static int dev_close_many(struct list_head *head)
1275 struct net_device *dev, *tmp;
1276 LIST_HEAD(tmp_list);
1278 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1279 if (!(dev->flags & IFF_UP))
1280 list_move(&dev->unreg_list, &tmp_list);
1282 __dev_close_many(head);
1284 list_for_each_entry(dev, head, unreg_list) {
1285 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1286 call_netdevice_notifiers(NETDEV_DOWN, dev);
1289 /* rollback_registered_many needs the complete original list */
1290 list_splice(&tmp_list, head);
1295 * dev_close - shutdown an interface.
1296 * @dev: device to shutdown
1298 * This function moves an active device into down state. A
1299 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1300 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1303 int dev_close(struct net_device *dev)
1305 if (dev->flags & IFF_UP) {
1308 list_add(&dev->unreg_list, &single);
1309 dev_close_many(&single);
1314 EXPORT_SYMBOL(dev_close);
1318 * dev_disable_lro - disable Large Receive Offload on a device
1321 * Disable Large Receive Offload (LRO) on a net device. Must be
1322 * called under RTNL. This is needed if received packets may be
1323 * forwarded to another interface.
1325 void dev_disable_lro(struct net_device *dev)
1330 * If we're trying to disable lro on a vlan device
1331 * use the underlying physical device instead
1333 if (is_vlan_dev(dev))
1334 dev = vlan_dev_real_dev(dev);
1336 if (dev->ethtool_ops && dev->ethtool_ops->get_flags)
1337 flags = dev->ethtool_ops->get_flags(dev);
1339 flags = ethtool_op_get_flags(dev);
1341 if (!(flags & ETH_FLAG_LRO))
1344 __ethtool_set_flags(dev, flags & ~ETH_FLAG_LRO);
1345 if (unlikely(dev->features & NETIF_F_LRO))
1346 netdev_WARN(dev, "failed to disable LRO!\n");
1348 EXPORT_SYMBOL(dev_disable_lro);
1351 static int dev_boot_phase = 1;
1354 * register_netdevice_notifier - register a network notifier block
1357 * Register a notifier to be called when network device events occur.
1358 * The notifier passed is linked into the kernel structures and must
1359 * not be reused until it has been unregistered. A negative errno code
1360 * is returned on a failure.
1362 * When registered all registration and up events are replayed
1363 * to the new notifier to allow device to have a race free
1364 * view of the network device list.
1367 int register_netdevice_notifier(struct notifier_block *nb)
1369 struct net_device *dev;
1370 struct net_device *last;
1375 err = raw_notifier_chain_register(&netdev_chain, nb);
1381 for_each_netdev(net, dev) {
1382 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1383 err = notifier_to_errno(err);
1387 if (!(dev->flags & IFF_UP))
1390 nb->notifier_call(nb, NETDEV_UP, dev);
1401 for_each_netdev(net, dev) {
1405 if (dev->flags & IFF_UP) {
1406 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1407 nb->notifier_call(nb, NETDEV_DOWN, dev);
1409 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1410 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1415 raw_notifier_chain_unregister(&netdev_chain, nb);
1418 EXPORT_SYMBOL(register_netdevice_notifier);
1421 * unregister_netdevice_notifier - unregister a network notifier block
1424 * Unregister a notifier previously registered by
1425 * register_netdevice_notifier(). The notifier is unlinked into the
1426 * kernel structures and may then be reused. A negative errno code
1427 * is returned on a failure.
1429 * After unregistering unregister and down device events are synthesized
1430 * for all devices on the device list to the removed notifier to remove
1431 * the need for special case cleanup code.
1434 int unregister_netdevice_notifier(struct notifier_block *nb)
1436 struct net_device *dev;
1441 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1446 for_each_netdev(net, dev) {
1447 if (dev->flags & IFF_UP) {
1448 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1449 nb->notifier_call(nb, NETDEV_DOWN, dev);
1451 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1452 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1459 EXPORT_SYMBOL(unregister_netdevice_notifier);
1462 * call_netdevice_notifiers - call all network notifier blocks
1463 * @val: value passed unmodified to notifier function
1464 * @dev: net_device pointer passed unmodified to notifier function
1466 * Call all network notifier blocks. Parameters and return value
1467 * are as for raw_notifier_call_chain().
1470 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1473 return raw_notifier_call_chain(&netdev_chain, val, dev);
1475 EXPORT_SYMBOL(call_netdevice_notifiers);
1477 /* When > 0 there are consumers of rx skb time stamps */
1478 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1480 void net_enable_timestamp(void)
1482 atomic_inc(&netstamp_needed);
1484 EXPORT_SYMBOL(net_enable_timestamp);
1486 void net_disable_timestamp(void)
1488 atomic_dec(&netstamp_needed);
1490 EXPORT_SYMBOL(net_disable_timestamp);
1492 static inline void net_timestamp_set(struct sk_buff *skb)
1494 if (atomic_read(&netstamp_needed))
1495 __net_timestamp(skb);
1497 skb->tstamp.tv64 = 0;
1500 static inline void net_timestamp_check(struct sk_buff *skb)
1502 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1503 __net_timestamp(skb);
1506 static int net_hwtstamp_validate(struct ifreq *ifr)
1508 struct hwtstamp_config cfg;
1509 enum hwtstamp_tx_types tx_type;
1510 enum hwtstamp_rx_filters rx_filter;
1511 int tx_type_valid = 0;
1512 int rx_filter_valid = 0;
1514 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1517 if (cfg.flags) /* reserved for future extensions */
1520 tx_type = cfg.tx_type;
1521 rx_filter = cfg.rx_filter;
1524 case HWTSTAMP_TX_OFF:
1525 case HWTSTAMP_TX_ON:
1526 case HWTSTAMP_TX_ONESTEP_SYNC:
1531 switch (rx_filter) {
1532 case HWTSTAMP_FILTER_NONE:
1533 case HWTSTAMP_FILTER_ALL:
1534 case HWTSTAMP_FILTER_SOME:
1535 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1536 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1537 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1538 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1539 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1540 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1541 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1542 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1543 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1544 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1545 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1546 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1547 rx_filter_valid = 1;
1551 if (!tx_type_valid || !rx_filter_valid)
1557 static inline bool is_skb_forwardable(struct net_device *dev,
1558 struct sk_buff *skb)
1562 if (!(dev->flags & IFF_UP))
1565 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1566 if (skb->len <= len)
1569 /* if TSO is enabled, we don't care about the length as the packet
1570 * could be forwarded without being segmented before
1572 if (skb_is_gso(skb))
1579 * dev_forward_skb - loopback an skb to another netif
1581 * @dev: destination network device
1582 * @skb: buffer to forward
1585 * NET_RX_SUCCESS (no congestion)
1586 * NET_RX_DROP (packet was dropped, but freed)
1588 * dev_forward_skb can be used for injecting an skb from the
1589 * start_xmit function of one device into the receive queue
1590 * of another device.
1592 * The receiving device may be in another namespace, so
1593 * we have to clear all information in the skb that could
1594 * impact namespace isolation.
1596 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1598 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1599 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1600 atomic_long_inc(&dev->rx_dropped);
1609 if (unlikely(!is_skb_forwardable(dev, skb))) {
1610 atomic_long_inc(&dev->rx_dropped);
1616 skb->tstamp.tv64 = 0;
1617 skb->pkt_type = PACKET_HOST;
1618 skb->protocol = eth_type_trans(skb, dev);
1622 nf_reset_trace(skb);
1623 return netif_rx(skb);
1625 EXPORT_SYMBOL_GPL(dev_forward_skb);
1627 static inline int deliver_skb(struct sk_buff *skb,
1628 struct packet_type *pt_prev,
1629 struct net_device *orig_dev)
1631 atomic_inc(&skb->users);
1632 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1635 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1637 if (!ptype->af_packet_priv || !skb->sk)
1640 if (ptype->id_match)
1641 return ptype->id_match(ptype, skb->sk);
1642 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1649 * Support routine. Sends outgoing frames to any network
1650 * taps currently in use.
1653 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1655 struct packet_type *ptype;
1656 struct sk_buff *skb2 = NULL;
1657 struct packet_type *pt_prev = NULL;
1660 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1661 /* Never send packets back to the socket
1662 * they originated from - MvS (miquels@drinkel.ow.org)
1664 if ((ptype->dev == dev || !ptype->dev) &&
1665 (!skb_loop_sk(ptype, skb))) {
1667 deliver_skb(skb2, pt_prev, skb->dev);
1672 skb2 = skb_clone(skb, GFP_ATOMIC);
1676 net_timestamp_set(skb2);
1678 /* skb->nh should be correctly
1679 set by sender, so that the second statement is
1680 just protection against buggy protocols.
1682 skb_reset_mac_header(skb2);
1684 if (skb_network_header(skb2) < skb2->data ||
1685 skb2->network_header > skb2->tail) {
1686 if (net_ratelimit())
1687 printk(KERN_CRIT "protocol %04x is "
1689 ntohs(skb2->protocol),
1691 skb_reset_network_header(skb2);
1694 skb2->transport_header = skb2->network_header;
1695 skb2->pkt_type = PACKET_OUTGOING;
1700 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1704 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1705 * @dev: Network device
1706 * @txq: number of queues available
1708 * If real_num_tx_queues is changed the tc mappings may no longer be
1709 * valid. To resolve this verify the tc mapping remains valid and if
1710 * not NULL the mapping. With no priorities mapping to this
1711 * offset/count pair it will no longer be used. In the worst case TC0
1712 * is invalid nothing can be done so disable priority mappings. If is
1713 * expected that drivers will fix this mapping if they can before
1714 * calling netif_set_real_num_tx_queues.
1716 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1719 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1721 /* If TC0 is invalidated disable TC mapping */
1722 if (tc->offset + tc->count > txq) {
1723 pr_warning("Number of in use tx queues changed "
1724 "invalidating tc mappings. Priority "
1725 "traffic classification disabled!\n");
1730 /* Invalidated prio to tc mappings set to TC0 */
1731 for (i = 1; i < TC_BITMASK + 1; i++) {
1732 int q = netdev_get_prio_tc_map(dev, i);
1734 tc = &dev->tc_to_txq[q];
1735 if (tc->offset + tc->count > txq) {
1736 pr_warning("Number of in use tx queues "
1737 "changed. Priority %i to tc "
1738 "mapping %i is no longer valid "
1739 "setting map to 0\n",
1741 netdev_set_prio_tc_map(dev, i, 0);
1747 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1748 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1750 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1754 if (txq < 1 || txq > dev->num_tx_queues)
1757 if (dev->reg_state == NETREG_REGISTERED ||
1758 dev->reg_state == NETREG_UNREGISTERING) {
1761 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1767 netif_setup_tc(dev, txq);
1769 if (txq < dev->real_num_tx_queues)
1770 qdisc_reset_all_tx_gt(dev, txq);
1773 dev->real_num_tx_queues = txq;
1776 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1780 * netif_set_real_num_rx_queues - set actual number of RX queues used
1781 * @dev: Network device
1782 * @rxq: Actual number of RX queues
1784 * This must be called either with the rtnl_lock held or before
1785 * registration of the net device. Returns 0 on success, or a
1786 * negative error code. If called before registration, it always
1789 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1793 if (rxq < 1 || rxq > dev->num_rx_queues)
1796 if (dev->reg_state == NETREG_REGISTERED) {
1799 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1805 dev->real_num_rx_queues = rxq;
1808 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1811 static inline void __netif_reschedule(struct Qdisc *q)
1813 struct softnet_data *sd;
1814 unsigned long flags;
1816 local_irq_save(flags);
1817 sd = &__get_cpu_var(softnet_data);
1818 q->next_sched = NULL;
1819 *sd->output_queue_tailp = q;
1820 sd->output_queue_tailp = &q->next_sched;
1821 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1822 local_irq_restore(flags);
1825 void __netif_schedule(struct Qdisc *q)
1827 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1828 __netif_reschedule(q);
1830 EXPORT_SYMBOL(__netif_schedule);
1832 void dev_kfree_skb_irq(struct sk_buff *skb)
1834 if (atomic_dec_and_test(&skb->users)) {
1835 struct softnet_data *sd;
1836 unsigned long flags;
1838 local_irq_save(flags);
1839 sd = &__get_cpu_var(softnet_data);
1840 skb->next = sd->completion_queue;
1841 sd->completion_queue = skb;
1842 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1843 local_irq_restore(flags);
1846 EXPORT_SYMBOL(dev_kfree_skb_irq);
1848 void dev_kfree_skb_any(struct sk_buff *skb)
1850 if (in_irq() || irqs_disabled())
1851 dev_kfree_skb_irq(skb);
1855 EXPORT_SYMBOL(dev_kfree_skb_any);
1859 * netif_device_detach - mark device as removed
1860 * @dev: network device
1862 * Mark device as removed from system and therefore no longer available.
1864 void netif_device_detach(struct net_device *dev)
1866 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1867 netif_running(dev)) {
1868 netif_tx_stop_all_queues(dev);
1871 EXPORT_SYMBOL(netif_device_detach);
1874 * netif_device_attach - mark device as attached
1875 * @dev: network device
1877 * Mark device as attached from system and restart if needed.
1879 void netif_device_attach(struct net_device *dev)
1881 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1882 netif_running(dev)) {
1883 netif_tx_wake_all_queues(dev);
1884 __netdev_watchdog_up(dev);
1887 EXPORT_SYMBOL(netif_device_attach);
1890 * Invalidate hardware checksum when packet is to be mangled, and
1891 * complete checksum manually on outgoing path.
1893 int skb_checksum_help(struct sk_buff *skb)
1896 int ret = 0, offset;
1898 if (skb->ip_summed == CHECKSUM_COMPLETE)
1899 goto out_set_summed;
1901 if (unlikely(skb_shinfo(skb)->gso_size)) {
1902 /* Let GSO fix up the checksum. */
1903 goto out_set_summed;
1906 offset = skb_checksum_start_offset(skb);
1907 BUG_ON(offset >= skb_headlen(skb));
1908 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1910 offset += skb->csum_offset;
1911 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1913 if (skb_cloned(skb) &&
1914 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1915 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1920 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1922 skb->ip_summed = CHECKSUM_NONE;
1926 EXPORT_SYMBOL(skb_checksum_help);
1929 * skb_gso_segment - Perform segmentation on skb.
1930 * @skb: buffer to segment
1931 * @features: features for the output path (see dev->features)
1933 * This function segments the given skb and returns a list of segments.
1935 * It may return NULL if the skb requires no segmentation. This is
1936 * only possible when GSO is used for verifying header integrity.
1938 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1940 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1941 struct packet_type *ptype;
1942 __be16 type = skb->protocol;
1943 int vlan_depth = ETH_HLEN;
1946 while (type == htons(ETH_P_8021Q)) {
1947 struct vlan_hdr *vh;
1949 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1950 return ERR_PTR(-EINVAL);
1952 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1953 type = vh->h_vlan_encapsulated_proto;
1954 vlan_depth += VLAN_HLEN;
1957 skb_reset_mac_header(skb);
1958 skb->mac_len = skb->network_header - skb->mac_header;
1959 __skb_pull(skb, skb->mac_len);
1961 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1962 struct net_device *dev = skb->dev;
1963 struct ethtool_drvinfo info = {};
1965 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1966 dev->ethtool_ops->get_drvinfo(dev, &info);
1968 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1969 info.driver, dev ? dev->features : 0L,
1970 skb->sk ? skb->sk->sk_route_caps : 0L,
1971 skb->len, skb->data_len, skb->ip_summed);
1973 if (skb_header_cloned(skb) &&
1974 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1975 return ERR_PTR(err);
1979 list_for_each_entry_rcu(ptype,
1980 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1981 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1982 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1983 err = ptype->gso_send_check(skb);
1984 segs = ERR_PTR(err);
1985 if (err || skb_gso_ok(skb, features))
1987 __skb_push(skb, (skb->data -
1988 skb_network_header(skb)));
1990 segs = ptype->gso_segment(skb, features);
1996 __skb_push(skb, skb->data - skb_mac_header(skb));
2000 EXPORT_SYMBOL(skb_gso_segment);
2002 /* Take action when hardware reception checksum errors are detected. */
2004 void netdev_rx_csum_fault(struct net_device *dev)
2006 if (net_ratelimit()) {
2007 printk(KERN_ERR "%s: hw csum failure.\n",
2008 dev ? dev->name : "<unknown>");
2012 EXPORT_SYMBOL(netdev_rx_csum_fault);
2015 /* Actually, we should eliminate this check as soon as we know, that:
2016 * 1. IOMMU is present and allows to map all the memory.
2017 * 2. No high memory really exists on this machine.
2020 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2022 #ifdef CONFIG_HIGHMEM
2024 if (!(dev->features & NETIF_F_HIGHDMA)) {
2025 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2026 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2027 if (PageHighMem(skb_frag_page(frag)))
2032 if (PCI_DMA_BUS_IS_PHYS) {
2033 struct device *pdev = dev->dev.parent;
2037 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2038 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2039 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2040 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2049 void (*destructor)(struct sk_buff *skb);
2052 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2054 static void dev_gso_skb_destructor(struct sk_buff *skb)
2056 struct dev_gso_cb *cb;
2059 struct sk_buff *nskb = skb->next;
2061 skb->next = nskb->next;
2064 } while (skb->next);
2066 cb = DEV_GSO_CB(skb);
2068 cb->destructor(skb);
2072 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2073 * @skb: buffer to segment
2074 * @features: device features as applicable to this skb
2076 * This function segments the given skb and stores the list of segments
2079 static int dev_gso_segment(struct sk_buff *skb, int features)
2081 struct sk_buff *segs;
2083 segs = skb_gso_segment(skb, features);
2085 /* Verifying header integrity only. */
2090 return PTR_ERR(segs);
2093 DEV_GSO_CB(skb)->destructor = skb->destructor;
2094 skb->destructor = dev_gso_skb_destructor;
2099 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2101 return ((features & NETIF_F_GEN_CSUM) ||
2102 ((features & NETIF_F_V4_CSUM) &&
2103 protocol == htons(ETH_P_IP)) ||
2104 ((features & NETIF_F_V6_CSUM) &&
2105 protocol == htons(ETH_P_IPV6)) ||
2106 ((features & NETIF_F_FCOE_CRC) &&
2107 protocol == htons(ETH_P_FCOE)));
2110 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2112 if (skb->ip_summed != CHECKSUM_NONE &&
2113 !can_checksum_protocol(features, protocol)) {
2114 features &= ~NETIF_F_ALL_CSUM;
2115 features &= ~NETIF_F_SG;
2116 } else if (illegal_highdma(skb->dev, skb)) {
2117 features &= ~NETIF_F_SG;
2123 u32 netif_skb_features(struct sk_buff *skb)
2125 __be16 protocol = skb->protocol;
2126 u32 features = skb->dev->features;
2128 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2129 features &= ~NETIF_F_GSO_MASK;
2131 if (protocol == htons(ETH_P_8021Q)) {
2132 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2133 protocol = veh->h_vlan_encapsulated_proto;
2134 } else if (!vlan_tx_tag_present(skb)) {
2135 return harmonize_features(skb, protocol, features);
2138 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2140 if (protocol != htons(ETH_P_8021Q)) {
2141 return harmonize_features(skb, protocol, features);
2143 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2144 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2145 return harmonize_features(skb, protocol, features);
2148 EXPORT_SYMBOL(netif_skb_features);
2151 * Returns true if either:
2152 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2153 * 2. skb is fragmented and the device does not support SG, or if
2154 * at least one of fragments is in highmem and device does not
2155 * support DMA from it.
2157 static inline int skb_needs_linearize(struct sk_buff *skb,
2160 return skb_is_nonlinear(skb) &&
2161 ((skb_has_frag_list(skb) &&
2162 !(features & NETIF_F_FRAGLIST)) ||
2163 (skb_shinfo(skb)->nr_frags &&
2164 !(features & NETIF_F_SG)));
2167 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2168 struct netdev_queue *txq)
2170 const struct net_device_ops *ops = dev->netdev_ops;
2171 int rc = NETDEV_TX_OK;
2172 unsigned int skb_len;
2174 if (likely(!skb->next)) {
2178 * If device doesn't need skb->dst, release it right now while
2179 * its hot in this cpu cache
2181 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2184 if (!list_empty(&ptype_all))
2185 dev_queue_xmit_nit(skb, dev);
2187 features = netif_skb_features(skb);
2189 if (vlan_tx_tag_present(skb) &&
2190 !(features & NETIF_F_HW_VLAN_TX)) {
2191 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2198 if (netif_needs_gso(skb, features)) {
2199 if (unlikely(dev_gso_segment(skb, features)))
2204 if (skb_needs_linearize(skb, features) &&
2205 __skb_linearize(skb))
2208 /* If packet is not checksummed and device does not
2209 * support checksumming for this protocol, complete
2210 * checksumming here.
2212 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2213 skb_set_transport_header(skb,
2214 skb_checksum_start_offset(skb));
2215 if (!(features & NETIF_F_ALL_CSUM) &&
2216 skb_checksum_help(skb))
2222 rc = ops->ndo_start_xmit(skb, dev);
2223 trace_net_dev_xmit(skb, rc, dev, skb_len);
2224 if (rc == NETDEV_TX_OK)
2225 txq_trans_update(txq);
2231 struct sk_buff *nskb = skb->next;
2233 skb->next = nskb->next;
2237 * If device doesn't need nskb->dst, release it right now while
2238 * its hot in this cpu cache
2240 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2243 skb_len = nskb->len;
2244 rc = ops->ndo_start_xmit(nskb, dev);
2245 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2246 if (unlikely(rc != NETDEV_TX_OK)) {
2247 if (rc & ~NETDEV_TX_MASK)
2248 goto out_kfree_gso_skb;
2249 nskb->next = skb->next;
2253 txq_trans_update(txq);
2254 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2255 return NETDEV_TX_BUSY;
2256 } while (skb->next);
2259 if (likely(skb->next == NULL))
2260 skb->destructor = DEV_GSO_CB(skb)->destructor;
2267 static u32 hashrnd __read_mostly;
2270 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2271 * to be used as a distribution range.
2273 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2274 unsigned int num_tx_queues)
2278 u16 qcount = num_tx_queues;
2280 if (skb_rx_queue_recorded(skb)) {
2281 hash = skb_get_rx_queue(skb);
2282 while (unlikely(hash >= num_tx_queues))
2283 hash -= num_tx_queues;
2288 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2289 qoffset = dev->tc_to_txq[tc].offset;
2290 qcount = dev->tc_to_txq[tc].count;
2293 if (skb->sk && skb->sk->sk_hash)
2294 hash = skb->sk->sk_hash;
2296 hash = (__force u16) skb->protocol;
2297 hash = jhash_1word(hash, hashrnd);
2299 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2301 EXPORT_SYMBOL(__skb_tx_hash);
2303 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2305 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2306 if (net_ratelimit()) {
2307 pr_warning("%s selects TX queue %d, but "
2308 "real number of TX queues is %d\n",
2309 dev->name, queue_index, dev->real_num_tx_queues);
2316 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2319 struct xps_dev_maps *dev_maps;
2320 struct xps_map *map;
2321 int queue_index = -1;
2324 dev_maps = rcu_dereference(dev->xps_maps);
2326 map = rcu_dereference(
2327 dev_maps->cpu_map[raw_smp_processor_id()]);
2330 queue_index = map->queues[0];
2333 if (skb->sk && skb->sk->sk_hash)
2334 hash = skb->sk->sk_hash;
2336 hash = (__force u16) skb->protocol ^
2338 hash = jhash_1word(hash, hashrnd);
2339 queue_index = map->queues[
2340 ((u64)hash * map->len) >> 32];
2342 if (unlikely(queue_index >= dev->real_num_tx_queues))
2354 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2355 struct sk_buff *skb)
2358 const struct net_device_ops *ops = dev->netdev_ops;
2360 if (dev->real_num_tx_queues == 1)
2362 else if (ops->ndo_select_queue) {
2363 queue_index = ops->ndo_select_queue(dev, skb);
2364 queue_index = dev_cap_txqueue(dev, queue_index);
2366 struct sock *sk = skb->sk;
2367 queue_index = sk_tx_queue_get(sk);
2369 if (queue_index < 0 || skb->ooo_okay ||
2370 queue_index >= dev->real_num_tx_queues) {
2371 int old_index = queue_index;
2373 queue_index = get_xps_queue(dev, skb);
2374 if (queue_index < 0)
2375 queue_index = skb_tx_hash(dev, skb);
2377 if (queue_index != old_index && sk) {
2378 struct dst_entry *dst =
2379 rcu_dereference_check(sk->sk_dst_cache, 1);
2381 if (dst && skb_dst(skb) == dst)
2382 sk_tx_queue_set(sk, queue_index);
2387 skb_set_queue_mapping(skb, queue_index);
2388 return netdev_get_tx_queue(dev, queue_index);
2391 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2392 struct net_device *dev,
2393 struct netdev_queue *txq)
2395 spinlock_t *root_lock = qdisc_lock(q);
2399 qdisc_skb_cb(skb)->pkt_len = skb->len;
2400 qdisc_calculate_pkt_len(skb, q);
2402 * Heuristic to force contended enqueues to serialize on a
2403 * separate lock before trying to get qdisc main lock.
2404 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2405 * and dequeue packets faster.
2407 contended = qdisc_is_running(q);
2408 if (unlikely(contended))
2409 spin_lock(&q->busylock);
2411 spin_lock(root_lock);
2412 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2415 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2416 qdisc_run_begin(q)) {
2418 * This is a work-conserving queue; there are no old skbs
2419 * waiting to be sent out; and the qdisc is not running -
2420 * xmit the skb directly.
2422 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2425 qdisc_bstats_update(q, skb);
2427 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2428 if (unlikely(contended)) {
2429 spin_unlock(&q->busylock);
2436 rc = NET_XMIT_SUCCESS;
2439 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2440 if (qdisc_run_begin(q)) {
2441 if (unlikely(contended)) {
2442 spin_unlock(&q->busylock);
2448 spin_unlock(root_lock);
2449 if (unlikely(contended))
2450 spin_unlock(&q->busylock);
2454 static DEFINE_PER_CPU(int, xmit_recursion);
2455 #define RECURSION_LIMIT 10
2458 * dev_queue_xmit - transmit a buffer
2459 * @skb: buffer to transmit
2461 * Queue a buffer for transmission to a network device. The caller must
2462 * have set the device and priority and built the buffer before calling
2463 * this function. The function can be called from an interrupt.
2465 * A negative errno code is returned on a failure. A success does not
2466 * guarantee the frame will be transmitted as it may be dropped due
2467 * to congestion or traffic shaping.
2469 * -----------------------------------------------------------------------------------
2470 * I notice this method can also return errors from the queue disciplines,
2471 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2474 * Regardless of the return value, the skb is consumed, so it is currently
2475 * difficult to retry a send to this method. (You can bump the ref count
2476 * before sending to hold a reference for retry if you are careful.)
2478 * When calling this method, interrupts MUST be enabled. This is because
2479 * the BH enable code must have IRQs enabled so that it will not deadlock.
2482 int dev_queue_xmit(struct sk_buff *skb)
2484 struct net_device *dev = skb->dev;
2485 struct netdev_queue *txq;
2489 /* Disable soft irqs for various locks below. Also
2490 * stops preemption for RCU.
2494 txq = dev_pick_tx(dev, skb);
2495 q = rcu_dereference_bh(txq->qdisc);
2497 #ifdef CONFIG_NET_CLS_ACT
2498 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2500 trace_net_dev_queue(skb);
2502 rc = __dev_xmit_skb(skb, q, dev, txq);
2506 /* The device has no queue. Common case for software devices:
2507 loopback, all the sorts of tunnels...
2509 Really, it is unlikely that netif_tx_lock protection is necessary
2510 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2512 However, it is possible, that they rely on protection
2515 Check this and shot the lock. It is not prone from deadlocks.
2516 Either shot noqueue qdisc, it is even simpler 8)
2518 if (dev->flags & IFF_UP) {
2519 int cpu = smp_processor_id(); /* ok because BHs are off */
2521 if (txq->xmit_lock_owner != cpu) {
2523 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2524 goto recursion_alert;
2526 HARD_TX_LOCK(dev, txq, cpu);
2528 if (!netif_tx_queue_stopped(txq)) {
2529 __this_cpu_inc(xmit_recursion);
2530 rc = dev_hard_start_xmit(skb, dev, txq);
2531 __this_cpu_dec(xmit_recursion);
2532 if (dev_xmit_complete(rc)) {
2533 HARD_TX_UNLOCK(dev, txq);
2537 HARD_TX_UNLOCK(dev, txq);
2538 if (net_ratelimit())
2539 printk(KERN_CRIT "Virtual device %s asks to "
2540 "queue packet!\n", dev->name);
2542 /* Recursion is detected! It is possible,
2546 if (net_ratelimit())
2547 printk(KERN_CRIT "Dead loop on virtual device "
2548 "%s, fix it urgently!\n", dev->name);
2553 rcu_read_unlock_bh();
2558 rcu_read_unlock_bh();
2561 EXPORT_SYMBOL(dev_queue_xmit);
2564 /*=======================================================================
2566 =======================================================================*/
2568 int netdev_max_backlog __read_mostly = 1000;
2569 int netdev_tstamp_prequeue __read_mostly = 1;
2570 int netdev_budget __read_mostly = 300;
2571 int weight_p __read_mostly = 64; /* old backlog weight */
2573 /* Called with irq disabled */
2574 static inline void ____napi_schedule(struct softnet_data *sd,
2575 struct napi_struct *napi)
2577 list_add_tail(&napi->poll_list, &sd->poll_list);
2578 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2582 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2583 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2584 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2585 * if hash is a canonical 4-tuple hash over transport ports.
2587 void __skb_get_rxhash(struct sk_buff *skb)
2589 int nhoff, hash = 0, poff;
2590 const struct ipv6hdr *ip6;
2591 const struct iphdr *ip;
2592 const struct vlan_hdr *vlan;
2601 nhoff = skb_network_offset(skb);
2602 proto = skb->protocol;
2606 case __constant_htons(ETH_P_IP):
2608 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2611 ip = (const struct iphdr *) (skb->data + nhoff);
2614 if (ip_is_fragment(ip))
2617 ip_proto = ip->protocol;
2618 addr1 = (__force u32) ip->saddr;
2619 addr2 = (__force u32) ip->daddr;
2620 nhoff += ip->ihl * 4;
2622 case __constant_htons(ETH_P_IPV6):
2624 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2627 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2628 ip_proto = ip6->nexthdr;
2629 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2630 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2633 case __constant_htons(ETH_P_8021Q):
2634 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2636 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2637 proto = vlan->h_vlan_encapsulated_proto;
2638 nhoff += sizeof(*vlan);
2640 case __constant_htons(ETH_P_PPP_SES):
2641 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2643 proto = *((__be16 *) (skb->data + nhoff +
2644 sizeof(struct pppoe_hdr)));
2645 nhoff += PPPOE_SES_HLEN;
2647 case __constant_htons(PPP_IP):
2649 case __constant_htons(PPP_IPV6):
2660 if (pskb_may_pull(skb, nhoff + 16)) {
2661 u8 *h = skb->data + nhoff;
2662 __be16 flags = *(__be16 *)h;
2665 * Only look inside GRE if version zero and no
2668 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2669 proto = *(__be16 *)(h + 2);
2671 if (flags & GRE_CSUM)
2673 if (flags & GRE_KEY)
2675 if (flags & GRE_SEQ)
2688 poff = proto_ports_offset(ip_proto);
2691 if (pskb_may_pull(skb, nhoff + 4)) {
2692 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2697 /* get a consistent hash (same value on both flow directions) */
2698 if (addr2 < addr1 ||
2700 ports.v16[1] < ports.v16[0])) {
2702 swap(ports.v16[0], ports.v16[1]);
2704 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2711 EXPORT_SYMBOL(__skb_get_rxhash);
2715 /* One global table that all flow-based protocols share. */
2716 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2717 EXPORT_SYMBOL(rps_sock_flow_table);
2719 static struct rps_dev_flow *
2720 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2721 struct rps_dev_flow *rflow, u16 next_cpu)
2723 if (next_cpu != RPS_NO_CPU) {
2724 #ifdef CONFIG_RFS_ACCEL
2725 struct netdev_rx_queue *rxqueue;
2726 struct rps_dev_flow_table *flow_table;
2727 struct rps_dev_flow *old_rflow;
2732 /* Should we steer this flow to a different hardware queue? */
2733 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2734 !(dev->features & NETIF_F_NTUPLE))
2736 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2737 if (rxq_index == skb_get_rx_queue(skb))
2740 rxqueue = dev->_rx + rxq_index;
2741 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2744 flow_id = skb->rxhash & flow_table->mask;
2745 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2746 rxq_index, flow_id);
2750 rflow = &flow_table->flows[flow_id];
2752 if (old_rflow->filter == rflow->filter)
2753 old_rflow->filter = RPS_NO_FILTER;
2757 per_cpu(softnet_data, next_cpu).input_queue_head;
2760 rflow->cpu = next_cpu;
2765 * get_rps_cpu is called from netif_receive_skb and returns the target
2766 * CPU from the RPS map of the receiving queue for a given skb.
2767 * rcu_read_lock must be held on entry.
2769 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2770 struct rps_dev_flow **rflowp)
2772 struct netdev_rx_queue *rxqueue;
2773 struct rps_map *map;
2774 struct rps_dev_flow_table *flow_table;
2775 struct rps_sock_flow_table *sock_flow_table;
2779 if (skb_rx_queue_recorded(skb)) {
2780 u16 index = skb_get_rx_queue(skb);
2781 if (unlikely(index >= dev->real_num_rx_queues)) {
2782 WARN_ONCE(dev->real_num_rx_queues > 1,
2783 "%s received packet on queue %u, but number "
2784 "of RX queues is %u\n",
2785 dev->name, index, dev->real_num_rx_queues);
2788 rxqueue = dev->_rx + index;
2792 map = rcu_dereference(rxqueue->rps_map);
2794 if (map->len == 1 &&
2795 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2796 tcpu = map->cpus[0];
2797 if (cpu_online(tcpu))
2801 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2805 skb_reset_network_header(skb);
2806 if (!skb_get_rxhash(skb))
2809 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2810 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2811 if (flow_table && sock_flow_table) {
2813 struct rps_dev_flow *rflow;
2815 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2818 next_cpu = sock_flow_table->ents[skb->rxhash &
2819 sock_flow_table->mask];
2822 * If the desired CPU (where last recvmsg was done) is
2823 * different from current CPU (one in the rx-queue flow
2824 * table entry), switch if one of the following holds:
2825 * - Current CPU is unset (equal to RPS_NO_CPU).
2826 * - Current CPU is offline.
2827 * - The current CPU's queue tail has advanced beyond the
2828 * last packet that was enqueued using this table entry.
2829 * This guarantees that all previous packets for the flow
2830 * have been dequeued, thus preserving in order delivery.
2832 if (unlikely(tcpu != next_cpu) &&
2833 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2834 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2835 rflow->last_qtail)) >= 0)) {
2837 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2840 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2848 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2850 if (cpu_online(tcpu)) {
2860 #ifdef CONFIG_RFS_ACCEL
2863 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2864 * @dev: Device on which the filter was set
2865 * @rxq_index: RX queue index
2866 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2867 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2869 * Drivers that implement ndo_rx_flow_steer() should periodically call
2870 * this function for each installed filter and remove the filters for
2871 * which it returns %true.
2873 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2874 u32 flow_id, u16 filter_id)
2876 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2877 struct rps_dev_flow_table *flow_table;
2878 struct rps_dev_flow *rflow;
2883 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2884 if (flow_table && flow_id <= flow_table->mask) {
2885 rflow = &flow_table->flows[flow_id];
2886 cpu = ACCESS_ONCE(rflow->cpu);
2887 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2888 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2889 rflow->last_qtail) <
2890 (int)(10 * flow_table->mask)))
2896 EXPORT_SYMBOL(rps_may_expire_flow);
2898 #endif /* CONFIG_RFS_ACCEL */
2900 /* Called from hardirq (IPI) context */
2901 static void rps_trigger_softirq(void *data)
2903 struct softnet_data *sd = data;
2905 ____napi_schedule(sd, &sd->backlog);
2909 #endif /* CONFIG_RPS */
2912 * Check if this softnet_data structure is another cpu one
2913 * If yes, queue it to our IPI list and return 1
2916 static int rps_ipi_queued(struct softnet_data *sd)
2919 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2922 sd->rps_ipi_next = mysd->rps_ipi_list;
2923 mysd->rps_ipi_list = sd;
2925 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2928 #endif /* CONFIG_RPS */
2933 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2934 * queue (may be a remote CPU queue).
2936 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2937 unsigned int *qtail)
2939 struct softnet_data *sd;
2940 unsigned long flags;
2942 sd = &per_cpu(softnet_data, cpu);
2944 local_irq_save(flags);
2947 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2948 if (skb_queue_len(&sd->input_pkt_queue)) {
2950 __skb_queue_tail(&sd->input_pkt_queue, skb);
2951 input_queue_tail_incr_save(sd, qtail);
2953 local_irq_restore(flags);
2954 return NET_RX_SUCCESS;
2957 /* Schedule NAPI for backlog device
2958 * We can use non atomic operation since we own the queue lock
2960 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2961 if (!rps_ipi_queued(sd))
2962 ____napi_schedule(sd, &sd->backlog);
2970 local_irq_restore(flags);
2972 atomic_long_inc(&skb->dev->rx_dropped);
2978 * netif_rx - post buffer to the network code
2979 * @skb: buffer to post
2981 * This function receives a packet from a device driver and queues it for
2982 * the upper (protocol) levels to process. It always succeeds. The buffer
2983 * may be dropped during processing for congestion control or by the
2987 * NET_RX_SUCCESS (no congestion)
2988 * NET_RX_DROP (packet was dropped)
2992 int netif_rx(struct sk_buff *skb)
2996 /* if netpoll wants it, pretend we never saw it */
2997 if (netpoll_rx(skb))
3000 if (netdev_tstamp_prequeue)
3001 net_timestamp_check(skb);
3003 trace_netif_rx(skb);
3006 struct rps_dev_flow voidflow, *rflow = &voidflow;
3012 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3014 cpu = smp_processor_id();
3016 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3024 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3030 EXPORT_SYMBOL(netif_rx);
3032 int netif_rx_ni(struct sk_buff *skb)
3037 err = netif_rx(skb);
3038 if (local_softirq_pending())
3044 EXPORT_SYMBOL(netif_rx_ni);
3046 static void net_tx_action(struct softirq_action *h)
3048 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3050 if (sd->completion_queue) {
3051 struct sk_buff *clist;
3053 local_irq_disable();
3054 clist = sd->completion_queue;
3055 sd->completion_queue = NULL;
3059 struct sk_buff *skb = clist;
3060 clist = clist->next;
3062 WARN_ON(atomic_read(&skb->users));
3063 trace_kfree_skb(skb, net_tx_action);
3068 if (sd->output_queue) {
3071 local_irq_disable();
3072 head = sd->output_queue;
3073 sd->output_queue = NULL;
3074 sd->output_queue_tailp = &sd->output_queue;
3078 struct Qdisc *q = head;
3079 spinlock_t *root_lock;
3081 head = head->next_sched;
3083 root_lock = qdisc_lock(q);
3084 if (spin_trylock(root_lock)) {
3085 smp_mb__before_clear_bit();
3086 clear_bit(__QDISC_STATE_SCHED,
3089 spin_unlock(root_lock);
3091 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3093 __netif_reschedule(q);
3095 smp_mb__before_clear_bit();
3096 clear_bit(__QDISC_STATE_SCHED,
3104 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3105 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3106 /* This hook is defined here for ATM LANE */
3107 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3108 unsigned char *addr) __read_mostly;
3109 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3112 #ifdef CONFIG_NET_CLS_ACT
3113 /* TODO: Maybe we should just force sch_ingress to be compiled in
3114 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3115 * a compare and 2 stores extra right now if we dont have it on
3116 * but have CONFIG_NET_CLS_ACT
3117 * NOTE: This doesn't stop any functionality; if you dont have
3118 * the ingress scheduler, you just can't add policies on ingress.
3121 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3123 struct net_device *dev = skb->dev;
3124 u32 ttl = G_TC_RTTL(skb->tc_verd);
3125 int result = TC_ACT_OK;
3128 if (unlikely(MAX_RED_LOOP < ttl++)) {
3129 if (net_ratelimit())
3130 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3131 skb->skb_iif, dev->ifindex);
3135 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3136 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3139 if (q != &noop_qdisc) {
3140 spin_lock(qdisc_lock(q));
3141 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3142 result = qdisc_enqueue_root(skb, q);
3143 spin_unlock(qdisc_lock(q));
3149 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3150 struct packet_type **pt_prev,
3151 int *ret, struct net_device *orig_dev)
3153 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3155 if (!rxq || rxq->qdisc == &noop_qdisc)
3159 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3163 switch (ing_filter(skb, rxq)) {
3177 * netdev_rx_handler_register - register receive handler
3178 * @dev: device to register a handler for
3179 * @rx_handler: receive handler to register
3180 * @rx_handler_data: data pointer that is used by rx handler
3182 * Register a receive hander for a device. This handler will then be
3183 * called from __netif_receive_skb. A negative errno code is returned
3186 * The caller must hold the rtnl_mutex.
3188 * For a general description of rx_handler, see enum rx_handler_result.
3190 int netdev_rx_handler_register(struct net_device *dev,
3191 rx_handler_func_t *rx_handler,
3192 void *rx_handler_data)
3196 if (dev->rx_handler)
3199 /* Note: rx_handler_data must be set before rx_handler */
3200 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3201 rcu_assign_pointer(dev->rx_handler, rx_handler);
3205 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3208 * netdev_rx_handler_unregister - unregister receive handler
3209 * @dev: device to unregister a handler from
3211 * Unregister a receive hander from a device.
3213 * The caller must hold the rtnl_mutex.
3215 void netdev_rx_handler_unregister(struct net_device *dev)
3219 RCU_INIT_POINTER(dev->rx_handler, NULL);
3220 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
3221 * section has a guarantee to see a non NULL rx_handler_data
3225 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3227 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3229 static int __netif_receive_skb(struct sk_buff *skb)
3231 struct packet_type *ptype, *pt_prev;
3232 rx_handler_func_t *rx_handler;
3233 struct net_device *orig_dev;
3234 struct net_device *null_or_dev;
3235 bool deliver_exact = false;
3236 int ret = NET_RX_DROP;
3239 if (!netdev_tstamp_prequeue)
3240 net_timestamp_check(skb);
3242 trace_netif_receive_skb(skb);
3244 /* if we've gotten here through NAPI, check netpoll */
3245 if (netpoll_receive_skb(skb))
3249 skb->skb_iif = skb->dev->ifindex;
3250 orig_dev = skb->dev;
3252 skb_reset_network_header(skb);
3253 skb_reset_transport_header(skb);
3254 skb_reset_mac_len(skb);
3262 __this_cpu_inc(softnet_data.processed);
3264 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3265 skb = vlan_untag(skb);
3270 #ifdef CONFIG_NET_CLS_ACT
3271 if (skb->tc_verd & TC_NCLS) {
3272 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3277 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3278 if (!ptype->dev || ptype->dev == skb->dev) {
3280 ret = deliver_skb(skb, pt_prev, orig_dev);
3285 #ifdef CONFIG_NET_CLS_ACT
3286 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3292 if (vlan_tx_tag_present(skb)) {
3294 ret = deliver_skb(skb, pt_prev, orig_dev);
3297 if (vlan_do_receive(&skb))
3299 else if (unlikely(!skb))
3303 rx_handler = rcu_dereference(skb->dev->rx_handler);
3306 ret = deliver_skb(skb, pt_prev, orig_dev);
3309 switch (rx_handler(&skb)) {
3310 case RX_HANDLER_CONSUMED:
3311 ret = NET_RX_SUCCESS;
3313 case RX_HANDLER_ANOTHER:
3315 case RX_HANDLER_EXACT:
3316 deliver_exact = true;
3317 case RX_HANDLER_PASS:
3324 if (vlan_tx_nonzero_tag_present(skb))
3325 skb->pkt_type = PACKET_OTHERHOST;
3327 /* deliver only exact match when indicated */
3328 null_or_dev = deliver_exact ? skb->dev : NULL;
3330 type = skb->protocol;
3331 list_for_each_entry_rcu(ptype,
3332 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3333 if (ptype->type == type &&
3334 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3335 ptype->dev == orig_dev)) {
3337 ret = deliver_skb(skb, pt_prev, orig_dev);
3343 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3345 atomic_long_inc(&skb->dev->rx_dropped);
3347 /* Jamal, now you will not able to escape explaining
3348 * me how you were going to use this. :-)
3359 * netif_receive_skb - process receive buffer from network
3360 * @skb: buffer to process
3362 * netif_receive_skb() is the main receive data processing function.
3363 * It always succeeds. The buffer may be dropped during processing
3364 * for congestion control or by the protocol layers.
3366 * This function may only be called from softirq context and interrupts
3367 * should be enabled.
3369 * Return values (usually ignored):
3370 * NET_RX_SUCCESS: no congestion
3371 * NET_RX_DROP: packet was dropped
3373 int netif_receive_skb(struct sk_buff *skb)
3375 if (netdev_tstamp_prequeue)
3376 net_timestamp_check(skb);
3378 if (skb_defer_rx_timestamp(skb))
3379 return NET_RX_SUCCESS;
3383 struct rps_dev_flow voidflow, *rflow = &voidflow;
3388 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3391 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3395 ret = __netif_receive_skb(skb);
3401 return __netif_receive_skb(skb);
3404 EXPORT_SYMBOL(netif_receive_skb);
3406 /* Network device is going away, flush any packets still pending
3407 * Called with irqs disabled.
3409 static void flush_backlog(void *arg)
3411 struct net_device *dev = arg;
3412 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3413 struct sk_buff *skb, *tmp;
3416 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3417 if (skb->dev == dev) {
3418 __skb_unlink(skb, &sd->input_pkt_queue);
3420 input_queue_head_incr(sd);
3425 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3426 if (skb->dev == dev) {
3427 __skb_unlink(skb, &sd->process_queue);
3429 input_queue_head_incr(sd);
3434 static int napi_gro_complete(struct sk_buff *skb)
3436 struct packet_type *ptype;
3437 __be16 type = skb->protocol;
3438 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3441 if (NAPI_GRO_CB(skb)->count == 1) {
3442 skb_shinfo(skb)->gso_size = 0;
3447 list_for_each_entry_rcu(ptype, head, list) {
3448 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3451 err = ptype->gro_complete(skb);
3457 WARN_ON(&ptype->list == head);
3459 return NET_RX_SUCCESS;
3463 return netif_receive_skb(skb);
3466 inline void napi_gro_flush(struct napi_struct *napi)
3468 struct sk_buff *skb, *next;
3470 for (skb = napi->gro_list; skb; skb = next) {
3473 napi_gro_complete(skb);
3476 napi->gro_count = 0;
3477 napi->gro_list = NULL;
3479 EXPORT_SYMBOL(napi_gro_flush);
3481 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3483 struct sk_buff **pp = NULL;
3484 struct packet_type *ptype;
3485 __be16 type = skb->protocol;
3486 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3489 enum gro_result ret;
3491 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3494 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3498 list_for_each_entry_rcu(ptype, head, list) {
3499 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3502 skb_set_network_header(skb, skb_gro_offset(skb));
3503 mac_len = skb->network_header - skb->mac_header;
3504 skb->mac_len = mac_len;
3505 NAPI_GRO_CB(skb)->same_flow = 0;
3506 NAPI_GRO_CB(skb)->flush = 0;
3507 NAPI_GRO_CB(skb)->free = 0;
3509 pp = ptype->gro_receive(&napi->gro_list, skb);
3514 if (&ptype->list == head)
3517 same_flow = NAPI_GRO_CB(skb)->same_flow;
3518 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3521 struct sk_buff *nskb = *pp;
3525 napi_gro_complete(nskb);
3532 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3536 NAPI_GRO_CB(skb)->count = 1;
3537 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3538 skb->next = napi->gro_list;
3539 napi->gro_list = skb;
3543 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3544 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3546 BUG_ON(skb->end - skb->tail < grow);
3548 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3551 skb->data_len -= grow;
3553 skb_shinfo(skb)->frags[0].page_offset += grow;
3554 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3556 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3557 skb_frag_unref(skb, 0);
3558 memmove(skb_shinfo(skb)->frags,
3559 skb_shinfo(skb)->frags + 1,
3560 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3571 EXPORT_SYMBOL(dev_gro_receive);
3573 static inline gro_result_t
3574 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3577 unsigned int maclen = skb->dev->hard_header_len;
3579 for (p = napi->gro_list; p; p = p->next) {
3580 unsigned long diffs;
3582 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3583 diffs |= p->vlan_tci ^ skb->vlan_tci;
3584 if (maclen == ETH_HLEN)
3585 diffs |= compare_ether_header(skb_mac_header(p),
3586 skb_gro_mac_header(skb));
3588 diffs = memcmp(skb_mac_header(p),
3589 skb_gro_mac_header(skb),
3591 NAPI_GRO_CB(p)->same_flow = !diffs;
3592 NAPI_GRO_CB(p)->flush = 0;
3595 return dev_gro_receive(napi, skb);
3598 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3602 if (netif_receive_skb(skb))
3607 case GRO_MERGED_FREE:
3618 EXPORT_SYMBOL(napi_skb_finish);
3620 void skb_gro_reset_offset(struct sk_buff *skb)
3622 NAPI_GRO_CB(skb)->data_offset = 0;
3623 NAPI_GRO_CB(skb)->frag0 = NULL;
3624 NAPI_GRO_CB(skb)->frag0_len = 0;
3626 if (skb->mac_header == skb->tail &&
3627 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3628 NAPI_GRO_CB(skb)->frag0 =
3629 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3630 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3633 EXPORT_SYMBOL(skb_gro_reset_offset);
3635 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3637 skb_gro_reset_offset(skb);
3639 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3641 EXPORT_SYMBOL(napi_gro_receive);
3643 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3645 __skb_pull(skb, skb_headlen(skb));
3646 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3647 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3649 skb->dev = napi->dev;
3651 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
3656 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3658 struct sk_buff *skb = napi->skb;
3661 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3667 EXPORT_SYMBOL(napi_get_frags);
3669 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3675 skb->protocol = eth_type_trans(skb, skb->dev);
3677 if (ret == GRO_HELD)
3678 skb_gro_pull(skb, -ETH_HLEN);
3679 else if (netif_receive_skb(skb))
3684 case GRO_MERGED_FREE:
3685 napi_reuse_skb(napi, skb);
3694 EXPORT_SYMBOL(napi_frags_finish);
3696 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3698 struct sk_buff *skb = napi->skb;
3705 skb_reset_mac_header(skb);
3706 skb_gro_reset_offset(skb);
3708 off = skb_gro_offset(skb);
3709 hlen = off + sizeof(*eth);
3710 eth = skb_gro_header_fast(skb, off);
3711 if (skb_gro_header_hard(skb, hlen)) {
3712 eth = skb_gro_header_slow(skb, hlen, off);
3713 if (unlikely(!eth)) {
3714 napi_reuse_skb(napi, skb);
3720 skb_gro_pull(skb, sizeof(*eth));
3723 * This works because the only protocols we care about don't require
3724 * special handling. We'll fix it up properly at the end.
3726 skb->protocol = eth->h_proto;
3731 EXPORT_SYMBOL(napi_frags_skb);
3733 gro_result_t napi_gro_frags(struct napi_struct *napi)
3735 struct sk_buff *skb = napi_frags_skb(napi);
3740 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3742 EXPORT_SYMBOL(napi_gro_frags);
3745 * net_rps_action sends any pending IPI's for rps.
3746 * Note: called with local irq disabled, but exits with local irq enabled.
3748 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3751 struct softnet_data *remsd = sd->rps_ipi_list;
3754 sd->rps_ipi_list = NULL;
3758 /* Send pending IPI's to kick RPS processing on remote cpus. */
3760 struct softnet_data *next = remsd->rps_ipi_next;
3762 if (cpu_online(remsd->cpu))
3763 __smp_call_function_single(remsd->cpu,
3772 static int process_backlog(struct napi_struct *napi, int quota)
3775 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3778 /* Check if we have pending ipi, its better to send them now,
3779 * not waiting net_rx_action() end.
3781 if (sd->rps_ipi_list) {
3782 local_irq_disable();
3783 net_rps_action_and_irq_enable(sd);
3786 napi->weight = weight_p;
3787 local_irq_disable();
3788 while (work < quota) {
3789 struct sk_buff *skb;
3792 while ((skb = __skb_dequeue(&sd->process_queue))) {
3794 __netif_receive_skb(skb);
3795 local_irq_disable();
3796 input_queue_head_incr(sd);
3797 if (++work >= quota) {
3804 qlen = skb_queue_len(&sd->input_pkt_queue);
3806 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3807 &sd->process_queue);
3809 if (qlen < quota - work) {
3811 * Inline a custom version of __napi_complete().
3812 * only current cpu owns and manipulates this napi,
3813 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3814 * we can use a plain write instead of clear_bit(),
3815 * and we dont need an smp_mb() memory barrier.
3817 list_del(&napi->poll_list);
3820 quota = work + qlen;
3830 * __napi_schedule - schedule for receive
3831 * @n: entry to schedule
3833 * The entry's receive function will be scheduled to run
3835 void __napi_schedule(struct napi_struct *n)
3837 unsigned long flags;
3839 local_irq_save(flags);
3840 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3841 local_irq_restore(flags);
3843 EXPORT_SYMBOL(__napi_schedule);
3845 void __napi_complete(struct napi_struct *n)
3847 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3848 BUG_ON(n->gro_list);
3850 list_del(&n->poll_list);
3851 smp_mb__before_clear_bit();
3852 clear_bit(NAPI_STATE_SCHED, &n->state);
3854 EXPORT_SYMBOL(__napi_complete);
3856 void napi_complete(struct napi_struct *n)
3858 unsigned long flags;
3861 * don't let napi dequeue from the cpu poll list
3862 * just in case its running on a different cpu
3864 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3868 local_irq_save(flags);
3870 local_irq_restore(flags);
3872 EXPORT_SYMBOL(napi_complete);
3874 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3875 int (*poll)(struct napi_struct *, int), int weight)
3877 INIT_LIST_HEAD(&napi->poll_list);
3878 napi->gro_count = 0;
3879 napi->gro_list = NULL;
3882 napi->weight = weight;
3883 list_add(&napi->dev_list, &dev->napi_list);
3885 #ifdef CONFIG_NETPOLL
3886 spin_lock_init(&napi->poll_lock);
3887 napi->poll_owner = -1;
3889 set_bit(NAPI_STATE_SCHED, &napi->state);
3891 EXPORT_SYMBOL(netif_napi_add);
3893 void netif_napi_del(struct napi_struct *napi)
3895 struct sk_buff *skb, *next;
3897 list_del_init(&napi->dev_list);
3898 napi_free_frags(napi);
3900 for (skb = napi->gro_list; skb; skb = next) {
3906 napi->gro_list = NULL;
3907 napi->gro_count = 0;
3909 EXPORT_SYMBOL(netif_napi_del);
3911 static void net_rx_action(struct softirq_action *h)
3913 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3914 unsigned long time_limit = jiffies + 2;
3915 int budget = netdev_budget;
3918 local_irq_disable();
3920 while (!list_empty(&sd->poll_list)) {
3921 struct napi_struct *n;
3924 /* If softirq window is exhuasted then punt.
3925 * Allow this to run for 2 jiffies since which will allow
3926 * an average latency of 1.5/HZ.
3928 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3933 /* Even though interrupts have been re-enabled, this
3934 * access is safe because interrupts can only add new
3935 * entries to the tail of this list, and only ->poll()
3936 * calls can remove this head entry from the list.
3938 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3940 have = netpoll_poll_lock(n);
3944 /* This NAPI_STATE_SCHED test is for avoiding a race
3945 * with netpoll's poll_napi(). Only the entity which
3946 * obtains the lock and sees NAPI_STATE_SCHED set will
3947 * actually make the ->poll() call. Therefore we avoid
3948 * accidentally calling ->poll() when NAPI is not scheduled.
3951 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3952 work = n->poll(n, weight);
3956 WARN_ON_ONCE(work > weight);
3960 local_irq_disable();
3962 /* Drivers must not modify the NAPI state if they
3963 * consume the entire weight. In such cases this code
3964 * still "owns" the NAPI instance and therefore can
3965 * move the instance around on the list at-will.
3967 if (unlikely(work == weight)) {
3968 if (unlikely(napi_disable_pending(n))) {
3971 local_irq_disable();
3973 list_move_tail(&n->poll_list, &sd->poll_list);
3976 netpoll_poll_unlock(have);
3979 net_rps_action_and_irq_enable(sd);
3981 #ifdef CONFIG_NET_DMA
3983 * There may not be any more sk_buffs coming right now, so push
3984 * any pending DMA copies to hardware
3986 dma_issue_pending_all();
3993 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3997 static gifconf_func_t *gifconf_list[NPROTO];
4000 * register_gifconf - register a SIOCGIF handler
4001 * @family: Address family
4002 * @gifconf: Function handler
4004 * Register protocol dependent address dumping routines. The handler
4005 * that is passed must not be freed or reused until it has been replaced
4006 * by another handler.
4008 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
4010 if (family >= NPROTO)
4012 gifconf_list[family] = gifconf;
4015 EXPORT_SYMBOL(register_gifconf);
4019 * Map an interface index to its name (SIOCGIFNAME)
4023 * We need this ioctl for efficient implementation of the
4024 * if_indextoname() function required by the IPv6 API. Without
4025 * it, we would have to search all the interfaces to find a
4029 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4031 struct net_device *dev;
4035 * Fetch the caller's info block.
4038 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4042 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4048 strcpy(ifr.ifr_name, dev->name);
4051 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4057 * Perform a SIOCGIFCONF call. This structure will change
4058 * size eventually, and there is nothing I can do about it.
4059 * Thus we will need a 'compatibility mode'.
4062 static int dev_ifconf(struct net *net, char __user *arg)
4065 struct net_device *dev;
4072 * Fetch the caller's info block.
4075 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4082 * Loop over the interfaces, and write an info block for each.
4086 for_each_netdev(net, dev) {
4087 for (i = 0; i < NPROTO; i++) {
4088 if (gifconf_list[i]) {
4091 done = gifconf_list[i](dev, NULL, 0);
4093 done = gifconf_list[i](dev, pos + total,
4103 * All done. Write the updated control block back to the caller.
4105 ifc.ifc_len = total;
4108 * Both BSD and Solaris return 0 here, so we do too.
4110 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4113 #ifdef CONFIG_PROC_FS
4115 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4117 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4118 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4119 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4121 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4123 struct net *net = seq_file_net(seq);
4124 struct net_device *dev;
4125 struct hlist_node *p;
4126 struct hlist_head *h;
4127 unsigned int count = 0, offset = get_offset(*pos);
4129 h = &net->dev_name_head[get_bucket(*pos)];
4130 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4131 if (++count == offset)
4138 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4140 struct net_device *dev;
4141 unsigned int bucket;
4144 dev = dev_from_same_bucket(seq, pos);
4148 bucket = get_bucket(*pos) + 1;
4149 *pos = set_bucket_offset(bucket, 1);
4150 } while (bucket < NETDEV_HASHENTRIES);
4156 * This is invoked by the /proc filesystem handler to display a device
4159 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4164 return SEQ_START_TOKEN;
4166 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4169 return dev_from_bucket(seq, pos);
4172 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4175 return dev_from_bucket(seq, pos);
4178 void dev_seq_stop(struct seq_file *seq, void *v)
4184 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4186 struct rtnl_link_stats64 temp;
4187 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4189 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4190 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4191 dev->name, stats->rx_bytes, stats->rx_packets,
4193 stats->rx_dropped + stats->rx_missed_errors,
4194 stats->rx_fifo_errors,
4195 stats->rx_length_errors + stats->rx_over_errors +
4196 stats->rx_crc_errors + stats->rx_frame_errors,
4197 stats->rx_compressed, stats->multicast,
4198 stats->tx_bytes, stats->tx_packets,
4199 stats->tx_errors, stats->tx_dropped,
4200 stats->tx_fifo_errors, stats->collisions,
4201 stats->tx_carrier_errors +
4202 stats->tx_aborted_errors +
4203 stats->tx_window_errors +
4204 stats->tx_heartbeat_errors,
4205 stats->tx_compressed);
4209 * Called from the PROCfs module. This now uses the new arbitrary sized
4210 * /proc/net interface to create /proc/net/dev
4212 static int dev_seq_show(struct seq_file *seq, void *v)
4214 if (v == SEQ_START_TOKEN)
4215 seq_puts(seq, "Inter-| Receive "
4217 " face |bytes packets errs drop fifo frame "
4218 "compressed multicast|bytes packets errs "
4219 "drop fifo colls carrier compressed\n");
4221 dev_seq_printf_stats(seq, v);
4225 static struct softnet_data *softnet_get_online(loff_t *pos)
4227 struct softnet_data *sd = NULL;
4229 while (*pos < nr_cpu_ids)
4230 if (cpu_online(*pos)) {
4231 sd = &per_cpu(softnet_data, *pos);
4238 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4240 return softnet_get_online(pos);
4243 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4246 return softnet_get_online(pos);
4249 static void softnet_seq_stop(struct seq_file *seq, void *v)
4253 static int softnet_seq_show(struct seq_file *seq, void *v)
4255 struct softnet_data *sd = v;
4257 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4258 sd->processed, sd->dropped, sd->time_squeeze, 0,
4259 0, 0, 0, 0, /* was fastroute */
4260 sd->cpu_collision, sd->received_rps);
4264 static const struct seq_operations dev_seq_ops = {
4265 .start = dev_seq_start,
4266 .next = dev_seq_next,
4267 .stop = dev_seq_stop,
4268 .show = dev_seq_show,
4271 static int dev_seq_open(struct inode *inode, struct file *file)
4273 return seq_open_net(inode, file, &dev_seq_ops,
4274 sizeof(struct seq_net_private));
4277 static const struct file_operations dev_seq_fops = {
4278 .owner = THIS_MODULE,
4279 .open = dev_seq_open,
4281 .llseek = seq_lseek,
4282 .release = seq_release_net,
4285 static const struct seq_operations softnet_seq_ops = {
4286 .start = softnet_seq_start,
4287 .next = softnet_seq_next,
4288 .stop = softnet_seq_stop,
4289 .show = softnet_seq_show,
4292 static int softnet_seq_open(struct inode *inode, struct file *file)
4294 return seq_open(file, &softnet_seq_ops);
4297 static const struct file_operations softnet_seq_fops = {
4298 .owner = THIS_MODULE,
4299 .open = softnet_seq_open,
4301 .llseek = seq_lseek,
4302 .release = seq_release,
4305 static void *ptype_get_idx(loff_t pos)
4307 struct packet_type *pt = NULL;
4311 list_for_each_entry_rcu(pt, &ptype_all, list) {
4317 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4318 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4327 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4331 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4334 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4336 struct packet_type *pt;
4337 struct list_head *nxt;
4341 if (v == SEQ_START_TOKEN)
4342 return ptype_get_idx(0);
4345 nxt = pt->list.next;
4346 if (pt->type == htons(ETH_P_ALL)) {
4347 if (nxt != &ptype_all)
4350 nxt = ptype_base[0].next;
4352 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4354 while (nxt == &ptype_base[hash]) {
4355 if (++hash >= PTYPE_HASH_SIZE)
4357 nxt = ptype_base[hash].next;
4360 return list_entry(nxt, struct packet_type, list);
4363 static void ptype_seq_stop(struct seq_file *seq, void *v)
4369 static int ptype_seq_show(struct seq_file *seq, void *v)
4371 struct packet_type *pt = v;
4373 if (v == SEQ_START_TOKEN)
4374 seq_puts(seq, "Type Device Function\n");
4375 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4376 if (pt->type == htons(ETH_P_ALL))
4377 seq_puts(seq, "ALL ");
4379 seq_printf(seq, "%04x", ntohs(pt->type));
4381 seq_printf(seq, " %-8s %pF\n",
4382 pt->dev ? pt->dev->name : "", pt->func);
4388 static const struct seq_operations ptype_seq_ops = {
4389 .start = ptype_seq_start,
4390 .next = ptype_seq_next,
4391 .stop = ptype_seq_stop,
4392 .show = ptype_seq_show,
4395 static int ptype_seq_open(struct inode *inode, struct file *file)
4397 return seq_open_net(inode, file, &ptype_seq_ops,
4398 sizeof(struct seq_net_private));
4401 static const struct file_operations ptype_seq_fops = {
4402 .owner = THIS_MODULE,
4403 .open = ptype_seq_open,
4405 .llseek = seq_lseek,
4406 .release = seq_release_net,
4410 static int __net_init dev_proc_net_init(struct net *net)
4414 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4416 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4418 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4421 if (wext_proc_init(net))
4427 proc_net_remove(net, "ptype");
4429 proc_net_remove(net, "softnet_stat");
4431 proc_net_remove(net, "dev");
4435 static void __net_exit dev_proc_net_exit(struct net *net)
4437 wext_proc_exit(net);
4439 proc_net_remove(net, "ptype");
4440 proc_net_remove(net, "softnet_stat");
4441 proc_net_remove(net, "dev");
4444 static struct pernet_operations __net_initdata dev_proc_ops = {
4445 .init = dev_proc_net_init,
4446 .exit = dev_proc_net_exit,
4449 static int __init dev_proc_init(void)
4451 return register_pernet_subsys(&dev_proc_ops);
4454 #define dev_proc_init() 0
4455 #endif /* CONFIG_PROC_FS */
4459 * netdev_set_master - set up master pointer
4460 * @slave: slave device
4461 * @master: new master device
4463 * Changes the master device of the slave. Pass %NULL to break the
4464 * bonding. The caller must hold the RTNL semaphore. On a failure
4465 * a negative errno code is returned. On success the reference counts
4466 * are adjusted and the function returns zero.
4468 int netdev_set_master(struct net_device *slave, struct net_device *master)
4470 struct net_device *old = slave->master;
4480 slave->master = master;
4486 EXPORT_SYMBOL(netdev_set_master);
4489 * netdev_set_bond_master - set up bonding master/slave pair
4490 * @slave: slave device
4491 * @master: new master device
4493 * Changes the master device of the slave. Pass %NULL to break the
4494 * bonding. The caller must hold the RTNL semaphore. On a failure
4495 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4496 * to the routing socket and the function returns zero.
4498 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4504 err = netdev_set_master(slave, master);
4508 slave->flags |= IFF_SLAVE;
4510 slave->flags &= ~IFF_SLAVE;
4512 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4515 EXPORT_SYMBOL(netdev_set_bond_master);
4517 static void dev_change_rx_flags(struct net_device *dev, int flags)
4519 const struct net_device_ops *ops = dev->netdev_ops;
4521 if (ops->ndo_change_rx_flags)
4522 ops->ndo_change_rx_flags(dev, flags);
4525 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4527 unsigned short old_flags = dev->flags;
4533 dev->flags |= IFF_PROMISC;
4534 dev->promiscuity += inc;
4535 if (dev->promiscuity == 0) {
4538 * If inc causes overflow, untouch promisc and return error.
4541 dev->flags &= ~IFF_PROMISC;
4543 dev->promiscuity -= inc;
4544 printk(KERN_WARNING "%s: promiscuity touches roof, "
4545 "set promiscuity failed, promiscuity feature "
4546 "of device might be broken.\n", dev->name);
4550 if (dev->flags != old_flags) {
4551 printk(KERN_INFO "device %s %s promiscuous mode\n",
4552 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4554 if (audit_enabled) {
4555 current_uid_gid(&uid, &gid);
4556 audit_log(current->audit_context, GFP_ATOMIC,
4557 AUDIT_ANOM_PROMISCUOUS,
4558 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4559 dev->name, (dev->flags & IFF_PROMISC),
4560 (old_flags & IFF_PROMISC),
4561 audit_get_loginuid(current),
4563 audit_get_sessionid(current));
4566 dev_change_rx_flags(dev, IFF_PROMISC);
4572 * dev_set_promiscuity - update promiscuity count on a device
4576 * Add or remove promiscuity from a device. While the count in the device
4577 * remains above zero the interface remains promiscuous. Once it hits zero
4578 * the device reverts back to normal filtering operation. A negative inc
4579 * value is used to drop promiscuity on the device.
4580 * Return 0 if successful or a negative errno code on error.
4582 int dev_set_promiscuity(struct net_device *dev, int inc)
4584 unsigned short old_flags = dev->flags;
4587 err = __dev_set_promiscuity(dev, inc);
4590 if (dev->flags != old_flags)
4591 dev_set_rx_mode(dev);
4594 EXPORT_SYMBOL(dev_set_promiscuity);
4597 * dev_set_allmulti - update allmulti count on a device
4601 * Add or remove reception of all multicast frames to a device. While the
4602 * count in the device remains above zero the interface remains listening
4603 * to all interfaces. Once it hits zero the device reverts back to normal
4604 * filtering operation. A negative @inc value is used to drop the counter
4605 * when releasing a resource needing all multicasts.
4606 * Return 0 if successful or a negative errno code on error.
4609 int dev_set_allmulti(struct net_device *dev, int inc)
4611 unsigned short old_flags = dev->flags;
4615 dev->flags |= IFF_ALLMULTI;
4616 dev->allmulti += inc;
4617 if (dev->allmulti == 0) {
4620 * If inc causes overflow, untouch allmulti and return error.
4623 dev->flags &= ~IFF_ALLMULTI;
4625 dev->allmulti -= inc;
4626 printk(KERN_WARNING "%s: allmulti touches roof, "
4627 "set allmulti failed, allmulti feature of "
4628 "device might be broken.\n", dev->name);
4632 if (dev->flags ^ old_flags) {
4633 dev_change_rx_flags(dev, IFF_ALLMULTI);
4634 dev_set_rx_mode(dev);
4638 EXPORT_SYMBOL(dev_set_allmulti);
4641 * Upload unicast and multicast address lists to device and
4642 * configure RX filtering. When the device doesn't support unicast
4643 * filtering it is put in promiscuous mode while unicast addresses
4646 void __dev_set_rx_mode(struct net_device *dev)
4648 const struct net_device_ops *ops = dev->netdev_ops;
4650 /* dev_open will call this function so the list will stay sane. */
4651 if (!(dev->flags&IFF_UP))
4654 if (!netif_device_present(dev))
4657 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4658 /* Unicast addresses changes may only happen under the rtnl,
4659 * therefore calling __dev_set_promiscuity here is safe.
4661 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4662 __dev_set_promiscuity(dev, 1);
4663 dev->uc_promisc = true;
4664 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4665 __dev_set_promiscuity(dev, -1);
4666 dev->uc_promisc = false;
4670 if (ops->ndo_set_rx_mode)
4671 ops->ndo_set_rx_mode(dev);
4674 void dev_set_rx_mode(struct net_device *dev)
4676 netif_addr_lock_bh(dev);
4677 __dev_set_rx_mode(dev);
4678 netif_addr_unlock_bh(dev);
4682 * dev_get_flags - get flags reported to userspace
4685 * Get the combination of flag bits exported through APIs to userspace.
4687 unsigned dev_get_flags(const struct net_device *dev)
4691 flags = (dev->flags & ~(IFF_PROMISC |
4696 (dev->gflags & (IFF_PROMISC |
4699 if (netif_running(dev)) {
4700 if (netif_oper_up(dev))
4701 flags |= IFF_RUNNING;
4702 if (netif_carrier_ok(dev))
4703 flags |= IFF_LOWER_UP;
4704 if (netif_dormant(dev))
4705 flags |= IFF_DORMANT;
4710 EXPORT_SYMBOL(dev_get_flags);
4712 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4714 int old_flags = dev->flags;
4720 * Set the flags on our device.
4723 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4724 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4726 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4730 * Load in the correct multicast list now the flags have changed.
4733 if ((old_flags ^ flags) & IFF_MULTICAST)
4734 dev_change_rx_flags(dev, IFF_MULTICAST);
4736 dev_set_rx_mode(dev);
4739 * Have we downed the interface. We handle IFF_UP ourselves
4740 * according to user attempts to set it, rather than blindly
4745 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4746 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4749 dev_set_rx_mode(dev);
4752 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4753 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4755 dev->gflags ^= IFF_PROMISC;
4756 dev_set_promiscuity(dev, inc);
4759 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4760 is important. Some (broken) drivers set IFF_PROMISC, when
4761 IFF_ALLMULTI is requested not asking us and not reporting.
4763 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4764 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4766 dev->gflags ^= IFF_ALLMULTI;
4767 dev_set_allmulti(dev, inc);
4773 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4775 unsigned int changes = dev->flags ^ old_flags;
4777 if (changes & IFF_UP) {
4778 if (dev->flags & IFF_UP)
4779 call_netdevice_notifiers(NETDEV_UP, dev);
4781 call_netdevice_notifiers(NETDEV_DOWN, dev);
4784 if (dev->flags & IFF_UP &&
4785 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4786 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4790 * dev_change_flags - change device settings
4792 * @flags: device state flags
4794 * Change settings on device based state flags. The flags are
4795 * in the userspace exported format.
4797 int dev_change_flags(struct net_device *dev, unsigned flags)
4800 int old_flags = dev->flags;
4802 ret = __dev_change_flags(dev, flags);
4806 changes = old_flags ^ dev->flags;
4808 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4810 __dev_notify_flags(dev, old_flags);
4813 EXPORT_SYMBOL(dev_change_flags);
4816 * dev_set_mtu - Change maximum transfer unit
4818 * @new_mtu: new transfer unit
4820 * Change the maximum transfer size of the network device.
4822 int dev_set_mtu(struct net_device *dev, int new_mtu)
4824 const struct net_device_ops *ops = dev->netdev_ops;
4827 if (new_mtu == dev->mtu)
4830 /* MTU must be positive. */
4834 if (!netif_device_present(dev))
4838 if (ops->ndo_change_mtu)
4839 err = ops->ndo_change_mtu(dev, new_mtu);
4843 if (!err && dev->flags & IFF_UP)
4844 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4847 EXPORT_SYMBOL(dev_set_mtu);
4850 * dev_set_group - Change group this device belongs to
4852 * @new_group: group this device should belong to
4854 void dev_set_group(struct net_device *dev, int new_group)
4856 dev->group = new_group;
4858 EXPORT_SYMBOL(dev_set_group);
4861 * dev_set_mac_address - Change Media Access Control Address
4865 * Change the hardware (MAC) address of the device
4867 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4869 const struct net_device_ops *ops = dev->netdev_ops;
4872 if (!ops->ndo_set_mac_address)
4874 if (sa->sa_family != dev->type)
4876 if (!netif_device_present(dev))
4878 err = ops->ndo_set_mac_address(dev, sa);
4880 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4881 add_device_randomness(dev->dev_addr, dev->addr_len);
4884 EXPORT_SYMBOL(dev_set_mac_address);
4887 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4889 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4892 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4898 case SIOCGIFFLAGS: /* Get interface flags */
4899 ifr->ifr_flags = (short) dev_get_flags(dev);
4902 case SIOCGIFMETRIC: /* Get the metric on the interface
4903 (currently unused) */
4904 ifr->ifr_metric = 0;
4907 case SIOCGIFMTU: /* Get the MTU of a device */
4908 ifr->ifr_mtu = dev->mtu;
4913 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4915 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4916 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4917 ifr->ifr_hwaddr.sa_family = dev->type;
4925 ifr->ifr_map.mem_start = dev->mem_start;
4926 ifr->ifr_map.mem_end = dev->mem_end;
4927 ifr->ifr_map.base_addr = dev->base_addr;
4928 ifr->ifr_map.irq = dev->irq;
4929 ifr->ifr_map.dma = dev->dma;
4930 ifr->ifr_map.port = dev->if_port;
4934 ifr->ifr_ifindex = dev->ifindex;
4938 ifr->ifr_qlen = dev->tx_queue_len;
4942 /* dev_ioctl() should ensure this case
4954 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4956 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4959 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4960 const struct net_device_ops *ops;
4965 ops = dev->netdev_ops;
4968 case SIOCSIFFLAGS: /* Set interface flags */
4969 return dev_change_flags(dev, ifr->ifr_flags);
4971 case SIOCSIFMETRIC: /* Set the metric on the interface
4972 (currently unused) */
4975 case SIOCSIFMTU: /* Set the MTU of a device */
4976 return dev_set_mtu(dev, ifr->ifr_mtu);
4979 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4981 case SIOCSIFHWBROADCAST:
4982 if (ifr->ifr_hwaddr.sa_family != dev->type)
4984 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4985 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4986 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4990 if (ops->ndo_set_config) {
4991 if (!netif_device_present(dev))
4993 return ops->ndo_set_config(dev, &ifr->ifr_map);
4998 if (!ops->ndo_set_rx_mode ||
4999 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5001 if (!netif_device_present(dev))
5003 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
5006 if (!ops->ndo_set_rx_mode ||
5007 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5009 if (!netif_device_present(dev))
5011 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
5014 if (ifr->ifr_qlen < 0)
5016 dev->tx_queue_len = ifr->ifr_qlen;
5020 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5021 return dev_change_name(dev, ifr->ifr_newname);
5024 err = net_hwtstamp_validate(ifr);
5030 * Unknown or private ioctl
5033 if ((cmd >= SIOCDEVPRIVATE &&
5034 cmd <= SIOCDEVPRIVATE + 15) ||
5035 cmd == SIOCBONDENSLAVE ||
5036 cmd == SIOCBONDRELEASE ||
5037 cmd == SIOCBONDSETHWADDR ||
5038 cmd == SIOCBONDSLAVEINFOQUERY ||
5039 cmd == SIOCBONDINFOQUERY ||
5040 cmd == SIOCBONDCHANGEACTIVE ||
5041 cmd == SIOCGMIIPHY ||
5042 cmd == SIOCGMIIREG ||
5043 cmd == SIOCSMIIREG ||
5044 cmd == SIOCBRADDIF ||
5045 cmd == SIOCBRDELIF ||
5046 cmd == SIOCSHWTSTAMP ||
5047 cmd == SIOCWANDEV) {
5049 if (ops->ndo_do_ioctl) {
5050 if (netif_device_present(dev))
5051 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5063 * This function handles all "interface"-type I/O control requests. The actual
5064 * 'doing' part of this is dev_ifsioc above.
5068 * dev_ioctl - network device ioctl
5069 * @net: the applicable net namespace
5070 * @cmd: command to issue
5071 * @arg: pointer to a struct ifreq in user space
5073 * Issue ioctl functions to devices. This is normally called by the
5074 * user space syscall interfaces but can sometimes be useful for
5075 * other purposes. The return value is the return from the syscall if
5076 * positive or a negative errno code on error.
5079 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5085 /* One special case: SIOCGIFCONF takes ifconf argument
5086 and requires shared lock, because it sleeps writing
5090 if (cmd == SIOCGIFCONF) {
5092 ret = dev_ifconf(net, (char __user *) arg);
5096 if (cmd == SIOCGIFNAME)
5097 return dev_ifname(net, (struct ifreq __user *)arg);
5099 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5102 ifr.ifr_name[IFNAMSIZ-1] = 0;
5104 colon = strchr(ifr.ifr_name, ':');
5109 * See which interface the caller is talking about.
5114 * These ioctl calls:
5115 * - can be done by all.
5116 * - atomic and do not require locking.
5127 dev_load(net, ifr.ifr_name);
5129 ret = dev_ifsioc_locked(net, &ifr, cmd);
5134 if (copy_to_user(arg, &ifr,
5135 sizeof(struct ifreq)))
5141 dev_load(net, ifr.ifr_name);
5143 ret = dev_ethtool(net, &ifr);
5148 if (copy_to_user(arg, &ifr,
5149 sizeof(struct ifreq)))
5155 * These ioctl calls:
5156 * - require superuser power.
5157 * - require strict serialization.
5163 if (!capable(CAP_NET_ADMIN))
5165 dev_load(net, ifr.ifr_name);
5167 ret = dev_ifsioc(net, &ifr, cmd);
5172 if (copy_to_user(arg, &ifr,
5173 sizeof(struct ifreq)))
5179 * These ioctl calls:
5180 * - require superuser power.
5181 * - require strict serialization.
5182 * - do not return a value
5192 case SIOCSIFHWBROADCAST:
5195 case SIOCBONDENSLAVE:
5196 case SIOCBONDRELEASE:
5197 case SIOCBONDSETHWADDR:
5198 case SIOCBONDCHANGEACTIVE:
5202 if (!capable(CAP_NET_ADMIN))
5205 case SIOCBONDSLAVEINFOQUERY:
5206 case SIOCBONDINFOQUERY:
5207 dev_load(net, ifr.ifr_name);
5209 ret = dev_ifsioc(net, &ifr, cmd);
5214 /* Get the per device memory space. We can add this but
5215 * currently do not support it */
5217 /* Set the per device memory buffer space.
5218 * Not applicable in our case */
5223 * Unknown or private ioctl.
5226 if (cmd == SIOCWANDEV ||
5227 (cmd >= SIOCDEVPRIVATE &&
5228 cmd <= SIOCDEVPRIVATE + 15)) {
5229 dev_load(net, ifr.ifr_name);
5231 ret = dev_ifsioc(net, &ifr, cmd);
5233 if (!ret && copy_to_user(arg, &ifr,
5234 sizeof(struct ifreq)))
5238 /* Take care of Wireless Extensions */
5239 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5240 return wext_handle_ioctl(net, &ifr, cmd, arg);
5247 * dev_new_index - allocate an ifindex
5248 * @net: the applicable net namespace
5250 * Returns a suitable unique value for a new device interface
5251 * number. The caller must hold the rtnl semaphore or the
5252 * dev_base_lock to be sure it remains unique.
5254 static int dev_new_index(struct net *net)
5260 if (!__dev_get_by_index(net, ifindex))
5265 /* Delayed registration/unregisteration */
5266 static LIST_HEAD(net_todo_list);
5268 static void net_set_todo(struct net_device *dev)
5270 list_add_tail(&dev->todo_list, &net_todo_list);
5273 static void rollback_registered_many(struct list_head *head)
5275 struct net_device *dev, *tmp;
5277 BUG_ON(dev_boot_phase);
5280 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5281 /* Some devices call without registering
5282 * for initialization unwind. Remove those
5283 * devices and proceed with the remaining.
5285 if (dev->reg_state == NETREG_UNINITIALIZED) {
5286 pr_debug("unregister_netdevice: device %s/%p never "
5287 "was registered\n", dev->name, dev);
5290 list_del(&dev->unreg_list);
5293 dev->dismantle = true;
5294 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5297 /* If device is running, close it first. */
5298 dev_close_many(head);
5300 list_for_each_entry(dev, head, unreg_list) {
5301 /* And unlink it from device chain. */
5302 unlist_netdevice(dev);
5304 dev->reg_state = NETREG_UNREGISTERING;
5309 list_for_each_entry(dev, head, unreg_list) {
5310 /* Shutdown queueing discipline. */
5314 /* Notify protocols, that we are about to destroy
5315 this device. They should clean all the things.
5317 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5319 if (!dev->rtnl_link_ops ||
5320 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5321 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5324 * Flush the unicast and multicast chains
5329 if (dev->netdev_ops->ndo_uninit)
5330 dev->netdev_ops->ndo_uninit(dev);
5332 /* Notifier chain MUST detach us from master device. */
5333 WARN_ON(dev->master);
5335 /* Remove entries from kobject tree */
5336 netdev_unregister_kobject(dev);
5339 /* Process any work delayed until the end of the batch */
5340 dev = list_first_entry(head, struct net_device, unreg_list);
5341 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5345 list_for_each_entry(dev, head, unreg_list)
5349 static void rollback_registered(struct net_device *dev)
5353 list_add(&dev->unreg_list, &single);
5354 rollback_registered_many(&single);
5358 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5360 /* Fix illegal checksum combinations */
5361 if ((features & NETIF_F_HW_CSUM) &&
5362 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5363 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5364 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5367 if ((features & NETIF_F_NO_CSUM) &&
5368 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5369 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5370 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5373 /* Fix illegal SG+CSUM combinations. */
5374 if ((features & NETIF_F_SG) &&
5375 !(features & NETIF_F_ALL_CSUM)) {
5377 "Dropping NETIF_F_SG since no checksum feature.\n");
5378 features &= ~NETIF_F_SG;
5381 /* TSO requires that SG is present as well. */
5382 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5383 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5384 features &= ~NETIF_F_ALL_TSO;
5387 /* TSO ECN requires that TSO is present as well. */
5388 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5389 features &= ~NETIF_F_TSO_ECN;
5391 /* Software GSO depends on SG. */
5392 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5393 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5394 features &= ~NETIF_F_GSO;
5397 /* UFO needs SG and checksumming */
5398 if (features & NETIF_F_UFO) {
5399 /* maybe split UFO into V4 and V6? */
5400 if (!((features & NETIF_F_GEN_CSUM) ||
5401 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5402 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5404 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5405 features &= ~NETIF_F_UFO;
5408 if (!(features & NETIF_F_SG)) {
5410 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5411 features &= ~NETIF_F_UFO;
5418 int __netdev_update_features(struct net_device *dev)
5425 features = netdev_get_wanted_features(dev);
5427 if (dev->netdev_ops->ndo_fix_features)
5428 features = dev->netdev_ops->ndo_fix_features(dev, features);
5430 /* driver might be less strict about feature dependencies */
5431 features = netdev_fix_features(dev, features);
5433 if (dev->features == features)
5436 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5437 dev->features, features);
5439 if (dev->netdev_ops->ndo_set_features)
5440 err = dev->netdev_ops->ndo_set_features(dev, features);
5442 if (unlikely(err < 0)) {
5444 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5445 err, features, dev->features);
5450 dev->features = features;
5456 * netdev_update_features - recalculate device features
5457 * @dev: the device to check
5459 * Recalculate dev->features set and send notifications if it
5460 * has changed. Should be called after driver or hardware dependent
5461 * conditions might have changed that influence the features.
5463 void netdev_update_features(struct net_device *dev)
5465 if (__netdev_update_features(dev))
5466 netdev_features_change(dev);
5468 EXPORT_SYMBOL(netdev_update_features);
5471 * netdev_change_features - recalculate device features
5472 * @dev: the device to check
5474 * Recalculate dev->features set and send notifications even
5475 * if they have not changed. Should be called instead of
5476 * netdev_update_features() if also dev->vlan_features might
5477 * have changed to allow the changes to be propagated to stacked
5480 void netdev_change_features(struct net_device *dev)
5482 __netdev_update_features(dev);
5483 netdev_features_change(dev);
5485 EXPORT_SYMBOL(netdev_change_features);
5488 * netif_stacked_transfer_operstate - transfer operstate
5489 * @rootdev: the root or lower level device to transfer state from
5490 * @dev: the device to transfer operstate to
5492 * Transfer operational state from root to device. This is normally
5493 * called when a stacking relationship exists between the root
5494 * device and the device(a leaf device).
5496 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5497 struct net_device *dev)
5499 if (rootdev->operstate == IF_OPER_DORMANT)
5500 netif_dormant_on(dev);
5502 netif_dormant_off(dev);
5504 if (netif_carrier_ok(rootdev)) {
5505 if (!netif_carrier_ok(dev))
5506 netif_carrier_on(dev);
5508 if (netif_carrier_ok(dev))
5509 netif_carrier_off(dev);
5512 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5515 static int netif_alloc_rx_queues(struct net_device *dev)
5517 unsigned int i, count = dev->num_rx_queues;
5518 struct netdev_rx_queue *rx;
5522 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5524 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5529 for (i = 0; i < count; i++)
5535 static void netdev_init_one_queue(struct net_device *dev,
5536 struct netdev_queue *queue, void *_unused)
5538 /* Initialize queue lock */
5539 spin_lock_init(&queue->_xmit_lock);
5540 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5541 queue->xmit_lock_owner = -1;
5542 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5546 static int netif_alloc_netdev_queues(struct net_device *dev)
5548 unsigned int count = dev->num_tx_queues;
5549 struct netdev_queue *tx;
5553 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5555 pr_err("netdev: Unable to allocate %u tx queues.\n",
5561 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5562 spin_lock_init(&dev->tx_global_lock);
5568 * register_netdevice - register a network device
5569 * @dev: device to register
5571 * Take a completed network device structure and add it to the kernel
5572 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5573 * chain. 0 is returned on success. A negative errno code is returned
5574 * on a failure to set up the device, or if the name is a duplicate.
5576 * Callers must hold the rtnl semaphore. You may want
5577 * register_netdev() instead of this.
5580 * The locking appears insufficient to guarantee two parallel registers
5581 * will not get the same name.
5584 int register_netdevice(struct net_device *dev)
5587 struct net *net = dev_net(dev);
5589 BUG_ON(dev_boot_phase);
5594 /* When net_device's are persistent, this will be fatal. */
5595 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5598 spin_lock_init(&dev->addr_list_lock);
5599 netdev_set_addr_lockdep_class(dev);
5603 ret = dev_get_valid_name(dev, dev->name);
5607 /* Init, if this function is available */
5608 if (dev->netdev_ops->ndo_init) {
5609 ret = dev->netdev_ops->ndo_init(dev);
5617 dev->ifindex = dev_new_index(net);
5618 if (dev->iflink == -1)
5619 dev->iflink = dev->ifindex;
5621 /* Transfer changeable features to wanted_features and enable
5622 * software offloads (GSO and GRO).
5624 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5625 dev->features |= NETIF_F_SOFT_FEATURES;
5626 dev->wanted_features = dev->features & dev->hw_features;
5628 /* Turn on no cache copy if HW is doing checksum */
5629 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5630 if ((dev->features & NETIF_F_ALL_CSUM) &&
5631 !(dev->features & NETIF_F_NO_CSUM)) {
5632 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5633 dev->features |= NETIF_F_NOCACHE_COPY;
5636 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5638 dev->vlan_features |= NETIF_F_HIGHDMA;
5640 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5641 ret = notifier_to_errno(ret);
5645 ret = netdev_register_kobject(dev);
5648 dev->reg_state = NETREG_REGISTERED;
5650 __netdev_update_features(dev);
5653 * Default initial state at registry is that the
5654 * device is present.
5657 set_bit(__LINK_STATE_PRESENT, &dev->state);
5659 dev_init_scheduler(dev);
5661 list_netdevice(dev);
5662 add_device_randomness(dev->dev_addr, dev->addr_len);
5664 /* Notify protocols, that a new device appeared. */
5665 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5666 ret = notifier_to_errno(ret);
5668 rollback_registered(dev);
5669 dev->reg_state = NETREG_UNREGISTERED;
5672 * Prevent userspace races by waiting until the network
5673 * device is fully setup before sending notifications.
5675 if (!dev->rtnl_link_ops ||
5676 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5677 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5683 if (dev->netdev_ops->ndo_uninit)
5684 dev->netdev_ops->ndo_uninit(dev);
5687 EXPORT_SYMBOL(register_netdevice);
5690 * init_dummy_netdev - init a dummy network device for NAPI
5691 * @dev: device to init
5693 * This takes a network device structure and initialize the minimum
5694 * amount of fields so it can be used to schedule NAPI polls without
5695 * registering a full blown interface. This is to be used by drivers
5696 * that need to tie several hardware interfaces to a single NAPI
5697 * poll scheduler due to HW limitations.
5699 int init_dummy_netdev(struct net_device *dev)
5701 /* Clear everything. Note we don't initialize spinlocks
5702 * are they aren't supposed to be taken by any of the
5703 * NAPI code and this dummy netdev is supposed to be
5704 * only ever used for NAPI polls
5706 memset(dev, 0, sizeof(struct net_device));
5708 /* make sure we BUG if trying to hit standard
5709 * register/unregister code path
5711 dev->reg_state = NETREG_DUMMY;
5713 /* NAPI wants this */
5714 INIT_LIST_HEAD(&dev->napi_list);
5716 /* a dummy interface is started by default */
5717 set_bit(__LINK_STATE_PRESENT, &dev->state);
5718 set_bit(__LINK_STATE_START, &dev->state);
5720 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5721 * because users of this 'device' dont need to change
5727 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5731 * register_netdev - register a network device
5732 * @dev: device to register
5734 * Take a completed network device structure and add it to the kernel
5735 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5736 * chain. 0 is returned on success. A negative errno code is returned
5737 * on a failure to set up the device, or if the name is a duplicate.
5739 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5740 * and expands the device name if you passed a format string to
5743 int register_netdev(struct net_device *dev)
5748 err = register_netdevice(dev);
5752 EXPORT_SYMBOL(register_netdev);
5754 int netdev_refcnt_read(const struct net_device *dev)
5758 for_each_possible_cpu(i)
5759 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5762 EXPORT_SYMBOL(netdev_refcnt_read);
5765 * netdev_wait_allrefs - wait until all references are gone.
5767 * This is called when unregistering network devices.
5769 * Any protocol or device that holds a reference should register
5770 * for netdevice notification, and cleanup and put back the
5771 * reference if they receive an UNREGISTER event.
5772 * We can get stuck here if buggy protocols don't correctly
5775 static void netdev_wait_allrefs(struct net_device *dev)
5777 unsigned long rebroadcast_time, warning_time;
5780 linkwatch_forget_dev(dev);
5782 rebroadcast_time = warning_time = jiffies;
5783 refcnt = netdev_refcnt_read(dev);
5785 while (refcnt != 0) {
5786 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5789 /* Rebroadcast unregister notification */
5790 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5791 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5792 * should have already handle it the first time */
5794 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5796 /* We must not have linkwatch events
5797 * pending on unregister. If this
5798 * happens, we simply run the queue
5799 * unscheduled, resulting in a noop
5802 linkwatch_run_queue();
5807 rebroadcast_time = jiffies;
5812 refcnt = netdev_refcnt_read(dev);
5814 if (time_after(jiffies, warning_time + 10 * HZ)) {
5815 printk(KERN_EMERG "unregister_netdevice: "
5816 "waiting for %s to become free. Usage "
5819 warning_time = jiffies;
5828 * register_netdevice(x1);
5829 * register_netdevice(x2);
5831 * unregister_netdevice(y1);
5832 * unregister_netdevice(y2);
5838 * We are invoked by rtnl_unlock().
5839 * This allows us to deal with problems:
5840 * 1) We can delete sysfs objects which invoke hotplug
5841 * without deadlocking with linkwatch via keventd.
5842 * 2) Since we run with the RTNL semaphore not held, we can sleep
5843 * safely in order to wait for the netdev refcnt to drop to zero.
5845 * We must not return until all unregister events added during
5846 * the interval the lock was held have been completed.
5848 void netdev_run_todo(void)
5850 struct list_head list;
5852 /* Snapshot list, allow later requests */
5853 list_replace_init(&net_todo_list, &list);
5857 /* Wait for rcu callbacks to finish before attempting to drain
5858 * the device list. This usually avoids a 250ms wait.
5860 if (!list_empty(&list))
5863 while (!list_empty(&list)) {
5864 struct net_device *dev
5865 = list_first_entry(&list, struct net_device, todo_list);
5866 list_del(&dev->todo_list);
5868 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5869 printk(KERN_ERR "network todo '%s' but state %d\n",
5870 dev->name, dev->reg_state);
5875 dev->reg_state = NETREG_UNREGISTERED;
5877 on_each_cpu(flush_backlog, dev, 1);
5879 netdev_wait_allrefs(dev);
5882 BUG_ON(netdev_refcnt_read(dev));
5883 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5884 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5885 WARN_ON(dev->dn_ptr);
5887 if (dev->destructor)
5888 dev->destructor(dev);
5890 /* Free network device */
5891 kobject_put(&dev->dev.kobj);
5895 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5896 * fields in the same order, with only the type differing.
5898 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5899 const struct net_device_stats *netdev_stats)
5901 #if BITS_PER_LONG == 64
5902 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5903 memcpy(stats64, netdev_stats, sizeof(*stats64));
5905 size_t i, n = sizeof(*stats64) / sizeof(u64);
5906 const unsigned long *src = (const unsigned long *)netdev_stats;
5907 u64 *dst = (u64 *)stats64;
5909 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5910 sizeof(*stats64) / sizeof(u64));
5911 for (i = 0; i < n; i++)
5917 * dev_get_stats - get network device statistics
5918 * @dev: device to get statistics from
5919 * @storage: place to store stats
5921 * Get network statistics from device. Return @storage.
5922 * The device driver may provide its own method by setting
5923 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5924 * otherwise the internal statistics structure is used.
5926 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5927 struct rtnl_link_stats64 *storage)
5929 const struct net_device_ops *ops = dev->netdev_ops;
5931 if (ops->ndo_get_stats64) {
5932 memset(storage, 0, sizeof(*storage));
5933 ops->ndo_get_stats64(dev, storage);
5934 } else if (ops->ndo_get_stats) {
5935 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5937 netdev_stats_to_stats64(storage, &dev->stats);
5939 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5942 EXPORT_SYMBOL(dev_get_stats);
5944 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5946 struct netdev_queue *queue = dev_ingress_queue(dev);
5948 #ifdef CONFIG_NET_CLS_ACT
5951 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5954 netdev_init_one_queue(dev, queue, NULL);
5955 queue->qdisc = &noop_qdisc;
5956 queue->qdisc_sleeping = &noop_qdisc;
5957 rcu_assign_pointer(dev->ingress_queue, queue);
5963 * alloc_netdev_mqs - allocate network device
5964 * @sizeof_priv: size of private data to allocate space for
5965 * @name: device name format string
5966 * @setup: callback to initialize device
5967 * @txqs: the number of TX subqueues to allocate
5968 * @rxqs: the number of RX subqueues to allocate
5970 * Allocates a struct net_device with private data area for driver use
5971 * and performs basic initialization. Also allocates subquue structs
5972 * for each queue on the device.
5974 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5975 void (*setup)(struct net_device *),
5976 unsigned int txqs, unsigned int rxqs)
5978 struct net_device *dev;
5980 struct net_device *p;
5982 BUG_ON(strlen(name) >= sizeof(dev->name));
5985 pr_err("alloc_netdev: Unable to allocate device "
5986 "with zero queues.\n");
5992 pr_err("alloc_netdev: Unable to allocate device "
5993 "with zero RX queues.\n");
5998 alloc_size = sizeof(struct net_device);
6000 /* ensure 32-byte alignment of private area */
6001 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6002 alloc_size += sizeof_priv;
6004 /* ensure 32-byte alignment of whole construct */
6005 alloc_size += NETDEV_ALIGN - 1;
6007 p = kzalloc(alloc_size, GFP_KERNEL);
6009 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
6013 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6014 dev->padded = (char *)dev - (char *)p;
6016 dev->pcpu_refcnt = alloc_percpu(int);
6017 if (!dev->pcpu_refcnt)
6020 if (dev_addr_init(dev))
6026 dev_net_set(dev, &init_net);
6028 dev->gso_max_size = GSO_MAX_SIZE;
6029 dev->gso_max_segs = GSO_MAX_SEGS;
6031 INIT_LIST_HEAD(&dev->napi_list);
6032 INIT_LIST_HEAD(&dev->unreg_list);
6033 INIT_LIST_HEAD(&dev->link_watch_list);
6034 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6037 dev->num_tx_queues = txqs;
6038 dev->real_num_tx_queues = txqs;
6039 if (netif_alloc_netdev_queues(dev))
6043 dev->num_rx_queues = rxqs;
6044 dev->real_num_rx_queues = rxqs;
6045 if (netif_alloc_rx_queues(dev))
6049 strcpy(dev->name, name);
6050 dev->group = INIT_NETDEV_GROUP;
6058 free_percpu(dev->pcpu_refcnt);
6068 EXPORT_SYMBOL(alloc_netdev_mqs);
6071 * free_netdev - free network device
6074 * This function does the last stage of destroying an allocated device
6075 * interface. The reference to the device object is released.
6076 * If this is the last reference then it will be freed.
6078 void free_netdev(struct net_device *dev)
6080 struct napi_struct *p, *n;
6082 release_net(dev_net(dev));
6089 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6091 /* Flush device addresses */
6092 dev_addr_flush(dev);
6094 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6097 free_percpu(dev->pcpu_refcnt);
6098 dev->pcpu_refcnt = NULL;
6100 /* Compatibility with error handling in drivers */
6101 if (dev->reg_state == NETREG_UNINITIALIZED) {
6102 kfree((char *)dev - dev->padded);
6106 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6107 dev->reg_state = NETREG_RELEASED;
6109 /* will free via device release */
6110 put_device(&dev->dev);
6112 EXPORT_SYMBOL(free_netdev);
6115 * synchronize_net - Synchronize with packet receive processing
6117 * Wait for packets currently being received to be done.
6118 * Does not block later packets from starting.
6120 void synchronize_net(void)
6123 if (rtnl_is_locked())
6124 synchronize_rcu_expedited();
6128 EXPORT_SYMBOL(synchronize_net);
6131 * unregister_netdevice_queue - remove device from the kernel
6135 * This function shuts down a device interface and removes it
6136 * from the kernel tables.
6137 * If head not NULL, device is queued to be unregistered later.
6139 * Callers must hold the rtnl semaphore. You may want
6140 * unregister_netdev() instead of this.
6143 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6148 list_move_tail(&dev->unreg_list, head);
6150 rollback_registered(dev);
6151 /* Finish processing unregister after unlock */
6155 EXPORT_SYMBOL(unregister_netdevice_queue);
6158 * unregister_netdevice_many - unregister many devices
6159 * @head: list of devices
6161 void unregister_netdevice_many(struct list_head *head)
6163 struct net_device *dev;
6165 if (!list_empty(head)) {
6166 rollback_registered_many(head);
6167 list_for_each_entry(dev, head, unreg_list)
6171 EXPORT_SYMBOL(unregister_netdevice_many);
6174 * unregister_netdev - remove device from the kernel
6177 * This function shuts down a device interface and removes it
6178 * from the kernel tables.
6180 * This is just a wrapper for unregister_netdevice that takes
6181 * the rtnl semaphore. In general you want to use this and not
6182 * unregister_netdevice.
6184 void unregister_netdev(struct net_device *dev)
6187 unregister_netdevice(dev);
6190 EXPORT_SYMBOL(unregister_netdev);
6193 * dev_change_net_namespace - move device to different nethost namespace
6195 * @net: network namespace
6196 * @pat: If not NULL name pattern to try if the current device name
6197 * is already taken in the destination network namespace.
6199 * This function shuts down a device interface and moves it
6200 * to a new network namespace. On success 0 is returned, on
6201 * a failure a netagive errno code is returned.
6203 * Callers must hold the rtnl semaphore.
6206 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6212 /* Don't allow namespace local devices to be moved. */
6214 if (dev->features & NETIF_F_NETNS_LOCAL)
6217 /* Ensure the device has been registrered */
6219 if (dev->reg_state != NETREG_REGISTERED)
6222 /* Get out if there is nothing todo */
6224 if (net_eq(dev_net(dev), net))
6227 /* Pick the destination device name, and ensure
6228 * we can use it in the destination network namespace.
6231 if (__dev_get_by_name(net, dev->name)) {
6232 /* We get here if we can't use the current device name */
6235 if (dev_get_valid_name(dev, pat) < 0)
6240 * And now a mini version of register_netdevice unregister_netdevice.
6243 /* If device is running close it first. */
6246 /* And unlink it from device chain */
6248 unlist_netdevice(dev);
6252 /* Shutdown queueing discipline. */
6255 /* Notify protocols, that we are about to destroy
6256 this device. They should clean all the things.
6258 Note that dev->reg_state stays at NETREG_REGISTERED.
6259 This is wanted because this way 8021q and macvlan know
6260 the device is just moving and can keep their slaves up.
6262 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6263 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6264 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6267 * Flush the unicast and multicast chains
6272 /* Actually switch the network namespace */
6273 dev_net_set(dev, net);
6275 /* If there is an ifindex conflict assign a new one */
6276 if (__dev_get_by_index(net, dev->ifindex)) {
6277 int iflink = (dev->iflink == dev->ifindex);
6278 dev->ifindex = dev_new_index(net);
6280 dev->iflink = dev->ifindex;
6283 /* Fixup kobjects */
6284 err = device_rename(&dev->dev, dev->name);
6287 /* Add the device back in the hashes */
6288 list_netdevice(dev);
6290 /* Notify protocols, that a new device appeared. */
6291 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6294 * Prevent userspace races by waiting until the network
6295 * device is fully setup before sending notifications.
6297 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6304 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6306 static int dev_cpu_callback(struct notifier_block *nfb,
6307 unsigned long action,
6310 struct sk_buff **list_skb;
6311 struct sk_buff *skb;
6312 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6313 struct softnet_data *sd, *oldsd;
6315 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6318 local_irq_disable();
6319 cpu = smp_processor_id();
6320 sd = &per_cpu(softnet_data, cpu);
6321 oldsd = &per_cpu(softnet_data, oldcpu);
6323 /* Find end of our completion_queue. */
6324 list_skb = &sd->completion_queue;
6326 list_skb = &(*list_skb)->next;
6327 /* Append completion queue from offline CPU. */
6328 *list_skb = oldsd->completion_queue;
6329 oldsd->completion_queue = NULL;
6331 /* Append output queue from offline CPU. */
6332 if (oldsd->output_queue) {
6333 *sd->output_queue_tailp = oldsd->output_queue;
6334 sd->output_queue_tailp = oldsd->output_queue_tailp;
6335 oldsd->output_queue = NULL;
6336 oldsd->output_queue_tailp = &oldsd->output_queue;
6338 /* Append NAPI poll list from offline CPU. */
6339 if (!list_empty(&oldsd->poll_list)) {
6340 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6341 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6344 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6347 /* Process offline CPU's input_pkt_queue */
6348 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6350 input_queue_head_incr(oldsd);
6352 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6354 input_queue_head_incr(oldsd);
6362 * netdev_increment_features - increment feature set by one
6363 * @all: current feature set
6364 * @one: new feature set
6365 * @mask: mask feature set
6367 * Computes a new feature set after adding a device with feature set
6368 * @one to the master device with current feature set @all. Will not
6369 * enable anything that is off in @mask. Returns the new feature set.
6371 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6373 if (mask & NETIF_F_GEN_CSUM)
6374 mask |= NETIF_F_ALL_CSUM;
6375 mask |= NETIF_F_VLAN_CHALLENGED;
6377 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6378 all &= one | ~NETIF_F_ALL_FOR_ALL;
6380 /* If device needs checksumming, downgrade to it. */
6381 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6382 all &= ~NETIF_F_NO_CSUM;
6384 /* If one device supports hw checksumming, set for all. */
6385 if (all & NETIF_F_GEN_CSUM)
6386 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6390 EXPORT_SYMBOL(netdev_increment_features);
6392 static struct hlist_head *netdev_create_hash(void)
6395 struct hlist_head *hash;
6397 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6399 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6400 INIT_HLIST_HEAD(&hash[i]);
6405 /* Initialize per network namespace state */
6406 static int __net_init netdev_init(struct net *net)
6408 if (net != &init_net)
6409 INIT_LIST_HEAD(&net->dev_base_head);
6411 net->dev_name_head = netdev_create_hash();
6412 if (net->dev_name_head == NULL)
6415 net->dev_index_head = netdev_create_hash();
6416 if (net->dev_index_head == NULL)
6422 kfree(net->dev_name_head);
6428 * netdev_drivername - network driver for the device
6429 * @dev: network device
6431 * Determine network driver for device.
6433 const char *netdev_drivername(const struct net_device *dev)
6435 const struct device_driver *driver;
6436 const struct device *parent;
6437 const char *empty = "";
6439 parent = dev->dev.parent;
6443 driver = parent->driver;
6444 if (driver && driver->name)
6445 return driver->name;
6449 int __netdev_printk(const char *level, const struct net_device *dev,
6450 struct va_format *vaf)
6454 if (dev && dev->dev.parent)
6455 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6456 netdev_name(dev), vaf);
6458 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6460 r = printk("%s(NULL net_device): %pV", level, vaf);
6464 EXPORT_SYMBOL(__netdev_printk);
6466 int netdev_printk(const char *level, const struct net_device *dev,
6467 const char *format, ...)
6469 struct va_format vaf;
6473 va_start(args, format);
6478 r = __netdev_printk(level, dev, &vaf);
6483 EXPORT_SYMBOL(netdev_printk);
6485 #define define_netdev_printk_level(func, level) \
6486 int func(const struct net_device *dev, const char *fmt, ...) \
6489 struct va_format vaf; \
6492 va_start(args, fmt); \
6497 r = __netdev_printk(level, dev, &vaf); \
6502 EXPORT_SYMBOL(func);
6504 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6505 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6506 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6507 define_netdev_printk_level(netdev_err, KERN_ERR);
6508 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6509 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6510 define_netdev_printk_level(netdev_info, KERN_INFO);
6512 static void __net_exit netdev_exit(struct net *net)
6514 kfree(net->dev_name_head);
6515 kfree(net->dev_index_head);
6518 static struct pernet_operations __net_initdata netdev_net_ops = {
6519 .init = netdev_init,
6520 .exit = netdev_exit,
6523 static void __net_exit default_device_exit(struct net *net)
6525 struct net_device *dev, *aux;
6527 * Push all migratable network devices back to the
6528 * initial network namespace
6531 for_each_netdev_safe(net, dev, aux) {
6533 char fb_name[IFNAMSIZ];
6535 /* Ignore unmoveable devices (i.e. loopback) */
6536 if (dev->features & NETIF_F_NETNS_LOCAL)
6539 /* Leave virtual devices for the generic cleanup */
6540 if (dev->rtnl_link_ops)
6543 /* Push remaining network devices to init_net */
6544 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6545 err = dev_change_net_namespace(dev, &init_net, fb_name);
6547 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6548 __func__, dev->name, err);
6555 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6557 /* At exit all network devices most be removed from a network
6558 * namespace. Do this in the reverse order of registration.
6559 * Do this across as many network namespaces as possible to
6560 * improve batching efficiency.
6562 struct net_device *dev;
6564 LIST_HEAD(dev_kill_list);
6567 list_for_each_entry(net, net_list, exit_list) {
6568 for_each_netdev_reverse(net, dev) {
6569 if (dev->rtnl_link_ops)
6570 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6572 unregister_netdevice_queue(dev, &dev_kill_list);
6575 unregister_netdevice_many(&dev_kill_list);
6576 list_del(&dev_kill_list);
6580 static struct pernet_operations __net_initdata default_device_ops = {
6581 .exit = default_device_exit,
6582 .exit_batch = default_device_exit_batch,
6586 * Initialize the DEV module. At boot time this walks the device list and
6587 * unhooks any devices that fail to initialise (normally hardware not
6588 * present) and leaves us with a valid list of present and active devices.
6593 * This is called single threaded during boot, so no need
6594 * to take the rtnl semaphore.
6596 static int __init net_dev_init(void)
6598 int i, rc = -ENOMEM;
6600 BUG_ON(!dev_boot_phase);
6602 if (dev_proc_init())
6605 if (netdev_kobject_init())
6608 INIT_LIST_HEAD(&ptype_all);
6609 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6610 INIT_LIST_HEAD(&ptype_base[i]);
6612 if (register_pernet_subsys(&netdev_net_ops))
6616 * Initialise the packet receive queues.
6619 for_each_possible_cpu(i) {
6620 struct softnet_data *sd = &per_cpu(softnet_data, i);
6622 memset(sd, 0, sizeof(*sd));
6623 skb_queue_head_init(&sd->input_pkt_queue);
6624 skb_queue_head_init(&sd->process_queue);
6625 sd->completion_queue = NULL;
6626 INIT_LIST_HEAD(&sd->poll_list);
6627 sd->output_queue = NULL;
6628 sd->output_queue_tailp = &sd->output_queue;
6630 sd->csd.func = rps_trigger_softirq;
6636 sd->backlog.poll = process_backlog;
6637 sd->backlog.weight = weight_p;
6638 sd->backlog.gro_list = NULL;
6639 sd->backlog.gro_count = 0;
6644 /* The loopback device is special if any other network devices
6645 * is present in a network namespace the loopback device must
6646 * be present. Since we now dynamically allocate and free the
6647 * loopback device ensure this invariant is maintained by
6648 * keeping the loopback device as the first device on the
6649 * list of network devices. Ensuring the loopback devices
6650 * is the first device that appears and the last network device
6653 if (register_pernet_device(&loopback_net_ops))
6656 if (register_pernet_device(&default_device_ops))
6659 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6660 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6662 hotcpu_notifier(dev_cpu_callback, 0);
6670 subsys_initcall(net_dev_init);
6672 static int __init initialize_hashrnd(void)
6674 get_random_bytes(&hashrnd, sizeof(hashrnd));
6678 late_initcall_sync(initialize_hashrnd);