bonding: do not set slave_dev npinfo before slave_enable_netpoll in bond_enslave
[linux/fpc-iii.git] / drivers / net / bonding / bond_main.c
blob13a015b8052b4b1b7fd541cf8a488f36504f4e71
1 /*
2 * originally based on the dummy device.
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
7 * bonding.c: an Ethernet Bonding driver
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/in.h>
42 #include <net/ip.h>
43 #include <linux/ip.h>
44 #include <linux/tcp.h>
45 #include <linux/udp.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/socket.h>
51 #include <linux/ctype.h>
52 #include <linux/inet.h>
53 #include <linux/bitops.h>
54 #include <linux/io.h>
55 #include <asm/dma.h>
56 #include <linux/uaccess.h>
57 #include <linux/errno.h>
58 #include <linux/netdevice.h>
59 #include <linux/inetdevice.h>
60 #include <linux/igmp.h>
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
63 #include <net/sock.h>
64 #include <linux/rtnetlink.h>
65 #include <linux/smp.h>
66 #include <linux/if_ether.h>
67 #include <net/arp.h>
68 #include <linux/mii.h>
69 #include <linux/ethtool.h>
70 #include <linux/if_vlan.h>
71 #include <linux/if_bonding.h>
72 #include <linux/jiffies.h>
73 #include <linux/preempt.h>
74 #include <net/route.h>
75 #include <net/net_namespace.h>
76 #include <net/netns/generic.h>
77 #include <net/pkt_sched.h>
78 #include <linux/rculist.h>
79 #include <net/flow_dissector.h>
80 #include <net/switchdev.h>
81 #include <net/bonding.h>
82 #include <net/bond_3ad.h>
83 #include <net/bond_alb.h>
85 #include "bonding_priv.h"
87 /*---------------------------- Module parameters ----------------------------*/
89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
91 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
92 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
93 static int num_peer_notif = 1;
94 static int miimon;
95 static int updelay;
96 static int downdelay;
97 static int use_carrier = 1;
98 static char *mode;
99 static char *primary;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *arp_all_targets;
109 static char *fail_over_mac;
110 static int all_slaves_active;
111 static struct bond_params bonding_defaults;
112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 static int packets_per_slave = 1;
114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
116 module_param(max_bonds, int, 0);
117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
118 module_param(tx_queues, int, 0);
119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
122 "failover event (alias of num_unsol_na)");
123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
125 "failover event (alias of num_grat_arp)");
126 module_param(miimon, int, 0);
127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
128 module_param(updelay, int, 0);
129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
130 module_param(downdelay, int, 0);
131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
132 "in milliseconds");
133 module_param(use_carrier, int, 0);
134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
135 "0 for off, 1 for on (default)");
136 module_param(mode, charp, 0);
137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
138 "1 for active-backup, 2 for balance-xor, "
139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
140 "6 for balance-alb");
141 module_param(primary, charp, 0);
142 MODULE_PARM_DESC(primary, "Primary network device to use");
143 module_param(primary_reselect, charp, 0);
144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
145 "once it comes up; "
146 "0 for always (default), "
147 "1 for only if speed of primary is "
148 "better, "
149 "2 for only on active slave "
150 "failure");
151 module_param(lacp_rate, charp, 0);
152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
153 "0 for slow, 1 for fast");
154 module_param(ad_select, charp, 0);
155 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
156 "0 for stable (default), 1 for bandwidth, "
157 "2 for count");
158 module_param(min_links, int, 0);
159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
161 module_param(xmit_hash_policy, charp, 0);
162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
163 "0 for layer 2 (default), 1 for layer 3+4, "
164 "2 for layer 2+3, 3 for encap layer 2+3, "
165 "4 for encap layer 3+4");
166 module_param(arp_interval, int, 0);
167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
168 module_param_array(arp_ip_target, charp, NULL, 0);
169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
170 module_param(arp_validate, charp, 0);
171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
172 "0 for none (default), 1 for active, "
173 "2 for backup, 3 for all");
174 module_param(arp_all_targets, charp, 0);
175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
176 module_param(fail_over_mac, charp, 0);
177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
178 "the same MAC; 0 for none (default), "
179 "1 for active, 2 for follow");
180 module_param(all_slaves_active, int, 0);
181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
182 "by setting active flag for all slaves; "
183 "0 for never (default), 1 for always.");
184 module_param(resend_igmp, int, 0);
185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
186 "link failure");
187 module_param(packets_per_slave, int, 0);
188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
189 "mode; 0 for a random slave, 1 packet per "
190 "slave (default), >1 packets per slave.");
191 module_param(lp_interval, uint, 0);
192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
193 "the bonding driver sends learning packets to "
194 "each slaves peer switch. The default is 1.");
196 /*----------------------------- Global variables ----------------------------*/
198 #ifdef CONFIG_NET_POLL_CONTROLLER
199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
200 #endif
202 int bond_net_id __read_mostly;
204 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
205 static int arp_ip_count;
206 static int bond_mode = BOND_MODE_ROUNDROBIN;
207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
208 static int lacp_fast;
210 /*-------------------------- Forward declarations ---------------------------*/
212 static int bond_init(struct net_device *bond_dev);
213 static void bond_uninit(struct net_device *bond_dev);
214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
215 struct rtnl_link_stats64 *stats);
216 static void bond_slave_arr_handler(struct work_struct *work);
217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
218 int mod);
220 /*---------------------------- General routines -----------------------------*/
222 const char *bond_mode_name(int mode)
224 static const char *names[] = {
225 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
226 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
227 [BOND_MODE_XOR] = "load balancing (xor)",
228 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
229 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
230 [BOND_MODE_TLB] = "transmit load balancing",
231 [BOND_MODE_ALB] = "adaptive load balancing",
234 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
235 return "unknown";
237 return names[mode];
240 /*---------------------------------- VLAN -----------------------------------*/
243 * bond_dev_queue_xmit - Prepare skb for xmit.
245 * @bond: bond device that got this skb for tx.
246 * @skb: hw accel VLAN tagged skb to transmit
247 * @slave_dev: slave that is supposed to xmit this skbuff
249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
250 struct net_device *slave_dev)
252 skb->dev = slave_dev;
254 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
255 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
256 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
258 if (unlikely(netpoll_tx_running(bond->dev)))
259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
260 else
261 dev_queue_xmit(skb);
264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
265 * We don't protect the slave list iteration with a lock because:
266 * a. This operation is performed in IOCTL context,
267 * b. The operation is protected by the RTNL semaphore in the 8021q code,
268 * c. Holding a lock with BH disabled while directly calling a base driver
269 * entry point is generally a BAD idea.
271 * The design of synchronization/protection for this operation in the 8021q
272 * module is good for one or more VLAN devices over a single physical device
273 * and cannot be extended for a teaming solution like bonding, so there is a
274 * potential race condition here where a net device from the vlan group might
275 * be referenced (either by a base driver or the 8021q code) while it is being
276 * removed from the system. However, it turns out we're not making matters
277 * worse, and if it works for regular VLAN usage it will work here too.
281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
282 * @bond_dev: bonding net device that got called
283 * @vid: vlan id being added
285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
286 __be16 proto, u16 vid)
288 struct bonding *bond = netdev_priv(bond_dev);
289 struct slave *slave, *rollback_slave;
290 struct list_head *iter;
291 int res;
293 bond_for_each_slave(bond, slave, iter) {
294 res = vlan_vid_add(slave->dev, proto, vid);
295 if (res)
296 goto unwind;
299 return 0;
301 unwind:
302 /* unwind to the slave that failed */
303 bond_for_each_slave(bond, rollback_slave, iter) {
304 if (rollback_slave == slave)
305 break;
307 vlan_vid_del(rollback_slave->dev, proto, vid);
310 return res;
314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
315 * @bond_dev: bonding net device that got called
316 * @vid: vlan id being removed
318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
319 __be16 proto, u16 vid)
321 struct bonding *bond = netdev_priv(bond_dev);
322 struct list_head *iter;
323 struct slave *slave;
325 bond_for_each_slave(bond, slave, iter)
326 vlan_vid_del(slave->dev, proto, vid);
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vid);
331 return 0;
334 /*------------------------------- Link status -------------------------------*/
336 /* Set the carrier state for the master according to the state of its
337 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
338 * do special 802.3ad magic.
340 * Returns zero if carrier state does not change, nonzero if it does.
342 int bond_set_carrier(struct bonding *bond)
344 struct list_head *iter;
345 struct slave *slave;
347 if (!bond_has_slaves(bond))
348 goto down;
350 if (BOND_MODE(bond) == BOND_MODE_8023AD)
351 return bond_3ad_set_carrier(bond);
353 bond_for_each_slave(bond, slave, iter) {
354 if (slave->link == BOND_LINK_UP) {
355 if (!netif_carrier_ok(bond->dev)) {
356 netif_carrier_on(bond->dev);
357 return 1;
359 return 0;
363 down:
364 if (netif_carrier_ok(bond->dev)) {
365 netif_carrier_off(bond->dev);
366 return 1;
368 return 0;
371 /* Get link speed and duplex from the slave's base driver
372 * using ethtool. If for some reason the call fails or the
373 * values are invalid, set speed and duplex to -1,
374 * and return. Return 1 if speed or duplex settings are
375 * UNKNOWN; 0 otherwise.
377 static int bond_update_speed_duplex(struct slave *slave)
379 struct net_device *slave_dev = slave->dev;
380 struct ethtool_link_ksettings ecmd;
381 int res;
383 slave->speed = SPEED_UNKNOWN;
384 slave->duplex = DUPLEX_UNKNOWN;
386 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
387 if (res < 0) {
388 slave->link = BOND_LINK_DOWN;
389 return 1;
391 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) {
392 slave->link = BOND_LINK_DOWN;
393 return 1;
395 switch (ecmd.base.duplex) {
396 case DUPLEX_FULL:
397 case DUPLEX_HALF:
398 break;
399 default:
400 slave->link = BOND_LINK_DOWN;
401 return 1;
404 slave->speed = ecmd.base.speed;
405 slave->duplex = ecmd.base.duplex;
407 return 0;
410 const char *bond_slave_link_status(s8 link)
412 switch (link) {
413 case BOND_LINK_UP:
414 return "up";
415 case BOND_LINK_FAIL:
416 return "going down";
417 case BOND_LINK_DOWN:
418 return "down";
419 case BOND_LINK_BACK:
420 return "going back";
421 default:
422 return "unknown";
426 /* if <dev> supports MII link status reporting, check its link status.
428 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
429 * depending upon the setting of the use_carrier parameter.
431 * Return either BMSR_LSTATUS, meaning that the link is up (or we
432 * can't tell and just pretend it is), or 0, meaning that the link is
433 * down.
435 * If reporting is non-zero, instead of faking link up, return -1 if
436 * both ETHTOOL and MII ioctls fail (meaning the device does not
437 * support them). If use_carrier is set, return whatever it says.
438 * It'd be nice if there was a good way to tell if a driver supports
439 * netif_carrier, but there really isn't.
441 static int bond_check_dev_link(struct bonding *bond,
442 struct net_device *slave_dev, int reporting)
444 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
445 int (*ioctl)(struct net_device *, struct ifreq *, int);
446 struct ifreq ifr;
447 struct mii_ioctl_data *mii;
449 if (!reporting && !netif_running(slave_dev))
450 return 0;
452 if (bond->params.use_carrier)
453 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
455 /* Try to get link status using Ethtool first. */
456 if (slave_dev->ethtool_ops->get_link)
457 return slave_dev->ethtool_ops->get_link(slave_dev) ?
458 BMSR_LSTATUS : 0;
460 /* Ethtool can't be used, fallback to MII ioctls. */
461 ioctl = slave_ops->ndo_do_ioctl;
462 if (ioctl) {
463 /* TODO: set pointer to correct ioctl on a per team member
464 * bases to make this more efficient. that is, once
465 * we determine the correct ioctl, we will always
466 * call it and not the others for that team
467 * member.
470 /* We cannot assume that SIOCGMIIPHY will also read a
471 * register; not all network drivers (e.g., e100)
472 * support that.
475 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
476 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
477 mii = if_mii(&ifr);
478 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
479 mii->reg_num = MII_BMSR;
480 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
481 return mii->val_out & BMSR_LSTATUS;
485 /* If reporting, report that either there's no dev->do_ioctl,
486 * or both SIOCGMIIREG and get_link failed (meaning that we
487 * cannot report link status). If not reporting, pretend
488 * we're ok.
490 return reporting ? -1 : BMSR_LSTATUS;
493 /*----------------------------- Multicast list ------------------------------*/
495 /* Push the promiscuity flag down to appropriate slaves */
496 static int bond_set_promiscuity(struct bonding *bond, int inc)
498 struct list_head *iter;
499 int err = 0;
501 if (bond_uses_primary(bond)) {
502 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
504 if (curr_active)
505 err = dev_set_promiscuity(curr_active->dev, inc);
506 } else {
507 struct slave *slave;
509 bond_for_each_slave(bond, slave, iter) {
510 err = dev_set_promiscuity(slave->dev, inc);
511 if (err)
512 return err;
515 return err;
518 /* Push the allmulti flag down to all slaves */
519 static int bond_set_allmulti(struct bonding *bond, int inc)
521 struct list_head *iter;
522 int err = 0;
524 if (bond_uses_primary(bond)) {
525 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
527 if (curr_active)
528 err = dev_set_allmulti(curr_active->dev, inc);
529 } else {
530 struct slave *slave;
532 bond_for_each_slave(bond, slave, iter) {
533 err = dev_set_allmulti(slave->dev, inc);
534 if (err)
535 return err;
538 return err;
541 /* Retrieve the list of registered multicast addresses for the bonding
542 * device and retransmit an IGMP JOIN request to the current active
543 * slave.
545 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
547 struct bonding *bond = container_of(work, struct bonding,
548 mcast_work.work);
550 if (!rtnl_trylock()) {
551 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
552 return;
554 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
556 if (bond->igmp_retrans > 1) {
557 bond->igmp_retrans--;
558 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
560 rtnl_unlock();
563 /* Flush bond's hardware addresses from slave */
564 static void bond_hw_addr_flush(struct net_device *bond_dev,
565 struct net_device *slave_dev)
567 struct bonding *bond = netdev_priv(bond_dev);
569 dev_uc_unsync(slave_dev, bond_dev);
570 dev_mc_unsync(slave_dev, bond_dev);
572 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
573 /* del lacpdu mc addr from mc list */
574 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
576 dev_mc_del(slave_dev, lacpdu_multicast);
580 /*--------------------------- Active slave change ---------------------------*/
582 /* Update the hardware address list and promisc/allmulti for the new and
583 * old active slaves (if any). Modes that are not using primary keep all
584 * slaves up date at all times; only the modes that use primary need to call
585 * this function to swap these settings during a failover.
587 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
588 struct slave *old_active)
590 if (old_active) {
591 if (bond->dev->flags & IFF_PROMISC)
592 dev_set_promiscuity(old_active->dev, -1);
594 if (bond->dev->flags & IFF_ALLMULTI)
595 dev_set_allmulti(old_active->dev, -1);
597 bond_hw_addr_flush(bond->dev, old_active->dev);
600 if (new_active) {
601 /* FIXME: Signal errors upstream. */
602 if (bond->dev->flags & IFF_PROMISC)
603 dev_set_promiscuity(new_active->dev, 1);
605 if (bond->dev->flags & IFF_ALLMULTI)
606 dev_set_allmulti(new_active->dev, 1);
608 netif_addr_lock_bh(bond->dev);
609 dev_uc_sync(new_active->dev, bond->dev);
610 dev_mc_sync(new_active->dev, bond->dev);
611 netif_addr_unlock_bh(bond->dev);
616 * bond_set_dev_addr - clone slave's address to bond
617 * @bond_dev: bond net device
618 * @slave_dev: slave net device
620 * Should be called with RTNL held.
622 static void bond_set_dev_addr(struct net_device *bond_dev,
623 struct net_device *slave_dev)
625 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
626 bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
627 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
628 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
629 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
632 static struct slave *bond_get_old_active(struct bonding *bond,
633 struct slave *new_active)
635 struct slave *slave;
636 struct list_head *iter;
638 bond_for_each_slave(bond, slave, iter) {
639 if (slave == new_active)
640 continue;
642 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
643 return slave;
646 return NULL;
649 /* bond_do_fail_over_mac
651 * Perform special MAC address swapping for fail_over_mac settings
653 * Called with RTNL
655 static void bond_do_fail_over_mac(struct bonding *bond,
656 struct slave *new_active,
657 struct slave *old_active)
659 u8 tmp_mac[ETH_ALEN];
660 struct sockaddr saddr;
661 int rv;
663 switch (bond->params.fail_over_mac) {
664 case BOND_FOM_ACTIVE:
665 if (new_active)
666 bond_set_dev_addr(bond->dev, new_active->dev);
667 break;
668 case BOND_FOM_FOLLOW:
669 /* if new_active && old_active, swap them
670 * if just old_active, do nothing (going to no active slave)
671 * if just new_active, set new_active to bond's MAC
673 if (!new_active)
674 return;
676 if (!old_active)
677 old_active = bond_get_old_active(bond, new_active);
679 if (old_active) {
680 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
681 ether_addr_copy(saddr.sa_data,
682 old_active->dev->dev_addr);
683 saddr.sa_family = new_active->dev->type;
684 } else {
685 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
686 saddr.sa_family = bond->dev->type;
689 rv = dev_set_mac_address(new_active->dev, &saddr);
690 if (rv) {
691 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
692 -rv, new_active->dev->name);
693 goto out;
696 if (!old_active)
697 goto out;
699 ether_addr_copy(saddr.sa_data, tmp_mac);
700 saddr.sa_family = old_active->dev->type;
702 rv = dev_set_mac_address(old_active->dev, &saddr);
703 if (rv)
704 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
705 -rv, new_active->dev->name);
706 out:
707 break;
708 default:
709 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
710 bond->params.fail_over_mac);
711 break;
716 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
718 struct slave *prim = rtnl_dereference(bond->primary_slave);
719 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
721 if (!prim || prim->link != BOND_LINK_UP) {
722 if (!curr || curr->link != BOND_LINK_UP)
723 return NULL;
724 return curr;
727 if (bond->force_primary) {
728 bond->force_primary = false;
729 return prim;
732 if (!curr || curr->link != BOND_LINK_UP)
733 return prim;
735 /* At this point, prim and curr are both up */
736 switch (bond->params.primary_reselect) {
737 case BOND_PRI_RESELECT_ALWAYS:
738 return prim;
739 case BOND_PRI_RESELECT_BETTER:
740 if (prim->speed < curr->speed)
741 return curr;
742 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
743 return curr;
744 return prim;
745 case BOND_PRI_RESELECT_FAILURE:
746 return curr;
747 default:
748 netdev_err(bond->dev, "impossible primary_reselect %d\n",
749 bond->params.primary_reselect);
750 return curr;
755 * bond_find_best_slave - select the best available slave to be the active one
756 * @bond: our bonding struct
758 static struct slave *bond_find_best_slave(struct bonding *bond)
760 struct slave *slave, *bestslave = NULL;
761 struct list_head *iter;
762 int mintime = bond->params.updelay;
764 slave = bond_choose_primary_or_current(bond);
765 if (slave)
766 return slave;
768 bond_for_each_slave(bond, slave, iter) {
769 if (slave->link == BOND_LINK_UP)
770 return slave;
771 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
772 slave->delay < mintime) {
773 mintime = slave->delay;
774 bestslave = slave;
778 return bestslave;
781 static bool bond_should_notify_peers(struct bonding *bond)
783 struct slave *slave;
785 rcu_read_lock();
786 slave = rcu_dereference(bond->curr_active_slave);
787 rcu_read_unlock();
789 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
790 slave ? slave->dev->name : "NULL");
792 if (!slave || !bond->send_peer_notif ||
793 !netif_carrier_ok(bond->dev) ||
794 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
795 return false;
797 return true;
801 * change_active_interface - change the active slave into the specified one
802 * @bond: our bonding struct
803 * @new: the new slave to make the active one
805 * Set the new slave to the bond's settings and unset them on the old
806 * curr_active_slave.
807 * Setting include flags, mc-list, promiscuity, allmulti, etc.
809 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
810 * because it is apparently the best available slave we have, even though its
811 * updelay hasn't timed out yet.
813 * Caller must hold RTNL.
815 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
817 struct slave *old_active;
819 ASSERT_RTNL();
821 old_active = rtnl_dereference(bond->curr_active_slave);
823 if (old_active == new_active)
824 return;
826 if (new_active) {
827 new_active->last_link_up = jiffies;
829 if (new_active->link == BOND_LINK_BACK) {
830 if (bond_uses_primary(bond)) {
831 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
832 new_active->dev->name,
833 (bond->params.updelay - new_active->delay) * bond->params.miimon);
836 new_active->delay = 0;
837 bond_set_slave_link_state(new_active, BOND_LINK_UP,
838 BOND_SLAVE_NOTIFY_NOW);
840 if (BOND_MODE(bond) == BOND_MODE_8023AD)
841 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
843 if (bond_is_lb(bond))
844 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
845 } else {
846 if (bond_uses_primary(bond)) {
847 netdev_info(bond->dev, "making interface %s the new active one\n",
848 new_active->dev->name);
853 if (bond_uses_primary(bond))
854 bond_hw_addr_swap(bond, new_active, old_active);
856 if (bond_is_lb(bond)) {
857 bond_alb_handle_active_change(bond, new_active);
858 if (old_active)
859 bond_set_slave_inactive_flags(old_active,
860 BOND_SLAVE_NOTIFY_NOW);
861 if (new_active)
862 bond_set_slave_active_flags(new_active,
863 BOND_SLAVE_NOTIFY_NOW);
864 } else {
865 rcu_assign_pointer(bond->curr_active_slave, new_active);
868 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
869 if (old_active)
870 bond_set_slave_inactive_flags(old_active,
871 BOND_SLAVE_NOTIFY_NOW);
873 if (new_active) {
874 bool should_notify_peers = false;
876 bond_set_slave_active_flags(new_active,
877 BOND_SLAVE_NOTIFY_NOW);
879 if (bond->params.fail_over_mac)
880 bond_do_fail_over_mac(bond, new_active,
881 old_active);
883 if (netif_running(bond->dev)) {
884 bond->send_peer_notif =
885 bond->params.num_peer_notif;
886 should_notify_peers =
887 bond_should_notify_peers(bond);
890 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
891 if (should_notify_peers)
892 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
893 bond->dev);
897 /* resend IGMP joins since active slave has changed or
898 * all were sent on curr_active_slave.
899 * resend only if bond is brought up with the affected
900 * bonding modes and the retransmission is enabled
902 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
903 ((bond_uses_primary(bond) && new_active) ||
904 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
905 bond->igmp_retrans = bond->params.resend_igmp;
906 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
911 * bond_select_active_slave - select a new active slave, if needed
912 * @bond: our bonding struct
914 * This functions should be called when one of the following occurs:
915 * - The old curr_active_slave has been released or lost its link.
916 * - The primary_slave has got its link back.
917 * - A slave has got its link back and there's no old curr_active_slave.
919 * Caller must hold RTNL.
921 void bond_select_active_slave(struct bonding *bond)
923 struct slave *best_slave;
924 int rv;
926 ASSERT_RTNL();
928 best_slave = bond_find_best_slave(bond);
929 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
930 bond_change_active_slave(bond, best_slave);
931 rv = bond_set_carrier(bond);
932 if (!rv)
933 return;
935 if (netif_carrier_ok(bond->dev))
936 netdev_info(bond->dev, "first active interface up!\n");
937 else
938 netdev_info(bond->dev, "now running without any active interface!\n");
942 #ifdef CONFIG_NET_POLL_CONTROLLER
943 static inline int slave_enable_netpoll(struct slave *slave)
945 struct netpoll *np;
946 int err = 0;
948 np = kzalloc(sizeof(*np), GFP_KERNEL);
949 err = -ENOMEM;
950 if (!np)
951 goto out;
953 err = __netpoll_setup(np, slave->dev);
954 if (err) {
955 kfree(np);
956 goto out;
958 slave->np = np;
959 out:
960 return err;
962 static inline void slave_disable_netpoll(struct slave *slave)
964 struct netpoll *np = slave->np;
966 if (!np)
967 return;
969 slave->np = NULL;
970 __netpoll_free_async(np);
973 static void bond_poll_controller(struct net_device *bond_dev)
975 struct bonding *bond = netdev_priv(bond_dev);
976 struct slave *slave = NULL;
977 struct list_head *iter;
978 struct ad_info ad_info;
979 struct netpoll_info *ni;
980 const struct net_device_ops *ops;
982 if (BOND_MODE(bond) == BOND_MODE_8023AD)
983 if (bond_3ad_get_active_agg_info(bond, &ad_info))
984 return;
986 bond_for_each_slave_rcu(bond, slave, iter) {
987 ops = slave->dev->netdev_ops;
988 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
989 continue;
991 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
992 struct aggregator *agg =
993 SLAVE_AD_INFO(slave)->port.aggregator;
995 if (agg &&
996 agg->aggregator_identifier != ad_info.aggregator_id)
997 continue;
1000 ni = rcu_dereference_bh(slave->dev->npinfo);
1001 if (down_trylock(&ni->dev_lock))
1002 continue;
1003 ops->ndo_poll_controller(slave->dev);
1004 up(&ni->dev_lock);
1008 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1010 struct bonding *bond = netdev_priv(bond_dev);
1011 struct list_head *iter;
1012 struct slave *slave;
1014 bond_for_each_slave(bond, slave, iter)
1015 if (bond_slave_is_up(slave))
1016 slave_disable_netpoll(slave);
1019 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1021 struct bonding *bond = netdev_priv(dev);
1022 struct list_head *iter;
1023 struct slave *slave;
1024 int err = 0;
1026 bond_for_each_slave(bond, slave, iter) {
1027 err = slave_enable_netpoll(slave);
1028 if (err) {
1029 bond_netpoll_cleanup(dev);
1030 break;
1033 return err;
1035 #else
1036 static inline int slave_enable_netpoll(struct slave *slave)
1038 return 0;
1040 static inline void slave_disable_netpoll(struct slave *slave)
1043 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1046 #endif
1048 /*---------------------------------- IOCTL ----------------------------------*/
1050 static netdev_features_t bond_fix_features(struct net_device *dev,
1051 netdev_features_t features)
1053 struct bonding *bond = netdev_priv(dev);
1054 struct list_head *iter;
1055 netdev_features_t mask;
1056 struct slave *slave;
1058 mask = features;
1060 features &= ~NETIF_F_ONE_FOR_ALL;
1061 features |= NETIF_F_ALL_FOR_ALL;
1063 bond_for_each_slave(bond, slave, iter) {
1064 features = netdev_increment_features(features,
1065 slave->dev->features,
1066 mask);
1068 features = netdev_add_tso_features(features, mask);
1070 return features;
1073 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1075 NETIF_F_HIGHDMA | NETIF_F_LRO)
1077 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1078 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1080 static void bond_compute_features(struct bonding *bond)
1082 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1083 IFF_XMIT_DST_RELEASE_PERM;
1084 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1085 netdev_features_t enc_features = BOND_ENC_FEATURES;
1086 struct net_device *bond_dev = bond->dev;
1087 struct list_head *iter;
1088 struct slave *slave;
1089 unsigned short max_hard_header_len = ETH_HLEN;
1090 unsigned int gso_max_size = GSO_MAX_SIZE;
1091 u16 gso_max_segs = GSO_MAX_SEGS;
1093 if (!bond_has_slaves(bond))
1094 goto done;
1095 vlan_features &= NETIF_F_ALL_FOR_ALL;
1097 bond_for_each_slave(bond, slave, iter) {
1098 vlan_features = netdev_increment_features(vlan_features,
1099 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1101 enc_features = netdev_increment_features(enc_features,
1102 slave->dev->hw_enc_features,
1103 BOND_ENC_FEATURES);
1104 dst_release_flag &= slave->dev->priv_flags;
1105 if (slave->dev->hard_header_len > max_hard_header_len)
1106 max_hard_header_len = slave->dev->hard_header_len;
1108 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1109 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1112 done:
1113 bond_dev->vlan_features = vlan_features;
1114 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1115 bond_dev->hard_header_len = max_hard_header_len;
1116 bond_dev->gso_max_segs = gso_max_segs;
1117 netif_set_gso_max_size(bond_dev, gso_max_size);
1119 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1120 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1121 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1122 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1124 netdev_change_features(bond_dev);
1127 static void bond_setup_by_slave(struct net_device *bond_dev,
1128 struct net_device *slave_dev)
1130 bond_dev->header_ops = slave_dev->header_ops;
1132 bond_dev->type = slave_dev->type;
1133 bond_dev->hard_header_len = slave_dev->hard_header_len;
1134 bond_dev->addr_len = slave_dev->addr_len;
1136 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1137 slave_dev->addr_len);
1140 /* On bonding slaves other than the currently active slave, suppress
1141 * duplicates except for alb non-mcast/bcast.
1143 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1144 struct slave *slave,
1145 struct bonding *bond)
1147 if (bond_is_slave_inactive(slave)) {
1148 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1149 skb->pkt_type != PACKET_BROADCAST &&
1150 skb->pkt_type != PACKET_MULTICAST)
1151 return false;
1152 return true;
1154 return false;
1157 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1159 struct sk_buff *skb = *pskb;
1160 struct slave *slave;
1161 struct bonding *bond;
1162 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1163 struct slave *);
1164 int ret = RX_HANDLER_ANOTHER;
1166 skb = skb_share_check(skb, GFP_ATOMIC);
1167 if (unlikely(!skb))
1168 return RX_HANDLER_CONSUMED;
1170 *pskb = skb;
1172 slave = bond_slave_get_rcu(skb->dev);
1173 bond = slave->bond;
1175 recv_probe = ACCESS_ONCE(bond->recv_probe);
1176 if (recv_probe) {
1177 ret = recv_probe(skb, bond, slave);
1178 if (ret == RX_HANDLER_CONSUMED) {
1179 consume_skb(skb);
1180 return ret;
1184 if (bond_should_deliver_exact_match(skb, slave, bond))
1185 return RX_HANDLER_EXACT;
1187 skb->dev = bond->dev;
1189 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1190 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1191 skb->pkt_type == PACKET_HOST) {
1193 if (unlikely(skb_cow_head(skb,
1194 skb->data - skb_mac_header(skb)))) {
1195 kfree_skb(skb);
1196 return RX_HANDLER_CONSUMED;
1198 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1201 return ret;
1204 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1206 switch (BOND_MODE(bond)) {
1207 case BOND_MODE_ROUNDROBIN:
1208 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1209 case BOND_MODE_ACTIVEBACKUP:
1210 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1211 case BOND_MODE_BROADCAST:
1212 return NETDEV_LAG_TX_TYPE_BROADCAST;
1213 case BOND_MODE_XOR:
1214 case BOND_MODE_8023AD:
1215 return NETDEV_LAG_TX_TYPE_HASH;
1216 default:
1217 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1221 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1223 struct netdev_lag_upper_info lag_upper_info;
1224 int err;
1226 lag_upper_info.tx_type = bond_lag_tx_type(bond);
1227 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1228 &lag_upper_info);
1229 if (err)
1230 return err;
1231 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1232 return 0;
1235 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1237 netdev_upper_dev_unlink(slave->dev, bond->dev);
1238 slave->dev->flags &= ~IFF_SLAVE;
1239 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1242 static struct slave *bond_alloc_slave(struct bonding *bond)
1244 struct slave *slave = NULL;
1246 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1247 if (!slave)
1248 return NULL;
1250 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1251 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1252 GFP_KERNEL);
1253 if (!SLAVE_AD_INFO(slave)) {
1254 kfree(slave);
1255 return NULL;
1258 return slave;
1261 static void bond_free_slave(struct slave *slave)
1263 struct bonding *bond = bond_get_bond_by_slave(slave);
1265 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1266 kfree(SLAVE_AD_INFO(slave));
1268 kfree(slave);
1271 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1273 info->bond_mode = BOND_MODE(bond);
1274 info->miimon = bond->params.miimon;
1275 info->num_slaves = bond->slave_cnt;
1278 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1280 strcpy(info->slave_name, slave->dev->name);
1281 info->link = slave->link;
1282 info->state = bond_slave_state(slave);
1283 info->link_failure_count = slave->link_failure_count;
1286 static void bond_netdev_notify(struct net_device *dev,
1287 struct netdev_bonding_info *info)
1289 rtnl_lock();
1290 netdev_bonding_info_change(dev, info);
1291 rtnl_unlock();
1294 static void bond_netdev_notify_work(struct work_struct *_work)
1296 struct netdev_notify_work *w =
1297 container_of(_work, struct netdev_notify_work, work.work);
1299 bond_netdev_notify(w->dev, &w->bonding_info);
1300 dev_put(w->dev);
1301 kfree(w);
1304 void bond_queue_slave_event(struct slave *slave)
1306 struct bonding *bond = slave->bond;
1307 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1309 if (!nnw)
1310 return;
1312 dev_hold(slave->dev);
1313 nnw->dev = slave->dev;
1314 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1315 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1316 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1318 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1321 void bond_lower_state_changed(struct slave *slave)
1323 struct netdev_lag_lower_state_info info;
1325 info.link_up = slave->link == BOND_LINK_UP ||
1326 slave->link == BOND_LINK_FAIL;
1327 info.tx_enabled = bond_is_active_slave(slave);
1328 netdev_lower_state_changed(slave->dev, &info);
1331 /* enslave device <slave> to bond device <master> */
1332 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1334 struct bonding *bond = netdev_priv(bond_dev);
1335 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1336 struct slave *new_slave = NULL, *prev_slave;
1337 struct sockaddr addr;
1338 int link_reporting;
1339 int res = 0, i;
1341 if (!bond->params.use_carrier &&
1342 slave_dev->ethtool_ops->get_link == NULL &&
1343 slave_ops->ndo_do_ioctl == NULL) {
1344 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1345 slave_dev->name);
1348 /* already in-use? */
1349 if (netdev_is_rx_handler_busy(slave_dev)) {
1350 netdev_err(bond_dev,
1351 "Error: Device is in use and cannot be enslaved\n");
1352 return -EBUSY;
1355 if (bond_dev == slave_dev) {
1356 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1357 return -EPERM;
1360 /* vlan challenged mutual exclusion */
1361 /* no need to lock since we're protected by rtnl_lock */
1362 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1363 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1364 slave_dev->name);
1365 if (vlan_uses_dev(bond_dev)) {
1366 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1367 slave_dev->name, bond_dev->name);
1368 return -EPERM;
1369 } else {
1370 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1371 slave_dev->name, slave_dev->name,
1372 bond_dev->name);
1374 } else {
1375 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1376 slave_dev->name);
1379 /* Old ifenslave binaries are no longer supported. These can
1380 * be identified with moderate accuracy by the state of the slave:
1381 * the current ifenslave will set the interface down prior to
1382 * enslaving it; the old ifenslave will not.
1384 if (slave_dev->flags & IFF_UP) {
1385 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1386 slave_dev->name);
1387 return -EPERM;
1390 /* set bonding device ether type by slave - bonding netdevices are
1391 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1392 * there is a need to override some of the type dependent attribs/funcs.
1394 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1395 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1397 if (!bond_has_slaves(bond)) {
1398 if (bond_dev->type != slave_dev->type) {
1399 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1400 bond_dev->type, slave_dev->type);
1402 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1403 bond_dev);
1404 res = notifier_to_errno(res);
1405 if (res) {
1406 netdev_err(bond_dev, "refused to change device type\n");
1407 return -EBUSY;
1410 /* Flush unicast and multicast addresses */
1411 dev_uc_flush(bond_dev);
1412 dev_mc_flush(bond_dev);
1414 if (slave_dev->type != ARPHRD_ETHER)
1415 bond_setup_by_slave(bond_dev, slave_dev);
1416 else {
1417 ether_setup(bond_dev);
1418 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1421 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1422 bond_dev);
1424 } else if (bond_dev->type != slave_dev->type) {
1425 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1426 slave_dev->name, slave_dev->type, bond_dev->type);
1427 return -EINVAL;
1430 if (slave_dev->type == ARPHRD_INFINIBAND &&
1431 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1432 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1433 slave_dev->type);
1434 res = -EOPNOTSUPP;
1435 goto err_undo_flags;
1438 if (!slave_ops->ndo_set_mac_address ||
1439 slave_dev->type == ARPHRD_INFINIBAND) {
1440 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1441 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1442 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1443 if (!bond_has_slaves(bond)) {
1444 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1445 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1446 } else {
1447 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1448 res = -EOPNOTSUPP;
1449 goto err_undo_flags;
1454 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1456 /* If this is the first slave, then we need to set the master's hardware
1457 * address to be the same as the slave's.
1459 if (!bond_has_slaves(bond) &&
1460 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1461 bond_set_dev_addr(bond->dev, slave_dev);
1463 new_slave = bond_alloc_slave(bond);
1464 if (!new_slave) {
1465 res = -ENOMEM;
1466 goto err_undo_flags;
1469 new_slave->bond = bond;
1470 new_slave->dev = slave_dev;
1471 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1472 * is set via sysfs or module option if desired.
1474 new_slave->queue_id = 0;
1476 /* Save slave's original mtu and then set it to match the bond */
1477 new_slave->original_mtu = slave_dev->mtu;
1478 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1479 if (res) {
1480 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1481 goto err_free;
1484 /* Save slave's original ("permanent") mac address for modes
1485 * that need it, and for restoring it upon release, and then
1486 * set it to the master's address
1488 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1490 if (!bond->params.fail_over_mac ||
1491 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1492 /* Set slave to master's mac address. The application already
1493 * set the master's mac address to that of the first slave
1495 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1496 addr.sa_family = slave_dev->type;
1497 res = dev_set_mac_address(slave_dev, &addr);
1498 if (res) {
1499 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1500 goto err_restore_mtu;
1504 /* set slave flag before open to prevent IPv6 addrconf */
1505 slave_dev->flags |= IFF_SLAVE;
1507 /* open the slave since the application closed it */
1508 res = dev_open(slave_dev);
1509 if (res) {
1510 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1511 goto err_restore_mac;
1514 slave_dev->priv_flags |= IFF_BONDING;
1515 /* initialize slave stats */
1516 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1518 if (bond_is_lb(bond)) {
1519 /* bond_alb_init_slave() must be called before all other stages since
1520 * it might fail and we do not want to have to undo everything
1522 res = bond_alb_init_slave(bond, new_slave);
1523 if (res)
1524 goto err_close;
1527 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1528 if (res) {
1529 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1530 slave_dev->name);
1531 goto err_close;
1534 prev_slave = bond_last_slave(bond);
1536 new_slave->delay = 0;
1537 new_slave->link_failure_count = 0;
1539 bond_update_speed_duplex(new_slave);
1541 new_slave->last_rx = jiffies -
1542 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1543 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1544 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1546 if (bond->params.miimon && !bond->params.use_carrier) {
1547 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1549 if ((link_reporting == -1) && !bond->params.arp_interval) {
1550 /* miimon is set but a bonded network driver
1551 * does not support ETHTOOL/MII and
1552 * arp_interval is not set. Note: if
1553 * use_carrier is enabled, we will never go
1554 * here (because netif_carrier is always
1555 * supported); thus, we don't need to change
1556 * the messages for netif_carrier.
1558 netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1559 slave_dev->name);
1560 } else if (link_reporting == -1) {
1561 /* unable get link status using mii/ethtool */
1562 netdev_warn(bond_dev, "can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n",
1563 slave_dev->name);
1567 /* check for initial state */
1568 new_slave->link = BOND_LINK_NOCHANGE;
1569 if (bond->params.miimon) {
1570 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1571 if (bond->params.updelay) {
1572 bond_set_slave_link_state(new_slave,
1573 BOND_LINK_BACK,
1574 BOND_SLAVE_NOTIFY_NOW);
1575 new_slave->delay = bond->params.updelay;
1576 } else {
1577 bond_set_slave_link_state(new_slave,
1578 BOND_LINK_UP,
1579 BOND_SLAVE_NOTIFY_NOW);
1581 } else {
1582 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1583 BOND_SLAVE_NOTIFY_NOW);
1585 } else if (bond->params.arp_interval) {
1586 bond_set_slave_link_state(new_slave,
1587 (netif_carrier_ok(slave_dev) ?
1588 BOND_LINK_UP : BOND_LINK_DOWN),
1589 BOND_SLAVE_NOTIFY_NOW);
1590 } else {
1591 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1592 BOND_SLAVE_NOTIFY_NOW);
1595 if (new_slave->link != BOND_LINK_DOWN)
1596 new_slave->last_link_up = jiffies;
1597 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1598 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1599 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1601 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1602 /* if there is a primary slave, remember it */
1603 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1604 rcu_assign_pointer(bond->primary_slave, new_slave);
1605 bond->force_primary = true;
1609 switch (BOND_MODE(bond)) {
1610 case BOND_MODE_ACTIVEBACKUP:
1611 bond_set_slave_inactive_flags(new_slave,
1612 BOND_SLAVE_NOTIFY_NOW);
1613 break;
1614 case BOND_MODE_8023AD:
1615 /* in 802.3ad mode, the internal mechanism
1616 * will activate the slaves in the selected
1617 * aggregator
1619 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1620 /* if this is the first slave */
1621 if (!prev_slave) {
1622 SLAVE_AD_INFO(new_slave)->id = 1;
1623 /* Initialize AD with the number of times that the AD timer is called in 1 second
1624 * can be called only after the mac address of the bond is set
1626 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1627 } else {
1628 SLAVE_AD_INFO(new_slave)->id =
1629 SLAVE_AD_INFO(prev_slave)->id + 1;
1632 bond_3ad_bind_slave(new_slave);
1633 break;
1634 case BOND_MODE_TLB:
1635 case BOND_MODE_ALB:
1636 bond_set_active_slave(new_slave);
1637 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1638 break;
1639 default:
1640 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1642 /* always active in trunk mode */
1643 bond_set_active_slave(new_slave);
1645 /* In trunking mode there is little meaning to curr_active_slave
1646 * anyway (it holds no special properties of the bond device),
1647 * so we can change it without calling change_active_interface()
1649 if (!rcu_access_pointer(bond->curr_active_slave) &&
1650 new_slave->link == BOND_LINK_UP)
1651 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1653 break;
1654 } /* switch(bond_mode) */
1656 #ifdef CONFIG_NET_POLL_CONTROLLER
1657 if (bond->dev->npinfo) {
1658 if (slave_enable_netpoll(new_slave)) {
1659 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1660 res = -EBUSY;
1661 goto err_detach;
1664 #endif
1666 if (!(bond_dev->features & NETIF_F_LRO))
1667 dev_disable_lro(slave_dev);
1669 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1670 new_slave);
1671 if (res) {
1672 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1673 goto err_detach;
1676 res = bond_master_upper_dev_link(bond, new_slave);
1677 if (res) {
1678 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1679 goto err_unregister;
1682 res = bond_sysfs_slave_add(new_slave);
1683 if (res) {
1684 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1685 goto err_upper_unlink;
1688 /* If the mode uses primary, then the following is handled by
1689 * bond_change_active_slave().
1691 if (!bond_uses_primary(bond)) {
1692 /* set promiscuity level to new slave */
1693 if (bond_dev->flags & IFF_PROMISC) {
1694 res = dev_set_promiscuity(slave_dev, 1);
1695 if (res)
1696 goto err_sysfs_del;
1699 /* set allmulti level to new slave */
1700 if (bond_dev->flags & IFF_ALLMULTI) {
1701 res = dev_set_allmulti(slave_dev, 1);
1702 if (res) {
1703 if (bond_dev->flags & IFF_PROMISC)
1704 dev_set_promiscuity(slave_dev, -1);
1705 goto err_sysfs_del;
1709 netif_addr_lock_bh(bond_dev);
1710 dev_mc_sync_multiple(slave_dev, bond_dev);
1711 dev_uc_sync_multiple(slave_dev, bond_dev);
1712 netif_addr_unlock_bh(bond_dev);
1714 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1715 /* add lacpdu mc addr to mc list */
1716 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1718 dev_mc_add(slave_dev, lacpdu_multicast);
1722 bond->slave_cnt++;
1723 bond_compute_features(bond);
1724 bond_set_carrier(bond);
1726 if (bond_uses_primary(bond)) {
1727 block_netpoll_tx();
1728 bond_select_active_slave(bond);
1729 unblock_netpoll_tx();
1732 if (bond_mode_uses_xmit_hash(bond))
1733 bond_update_slave_arr(bond, NULL);
1735 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1736 slave_dev->name,
1737 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1738 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1740 /* enslave is successful */
1741 bond_queue_slave_event(new_slave);
1742 return 0;
1744 /* Undo stages on error */
1745 err_sysfs_del:
1746 bond_sysfs_slave_del(new_slave);
1748 err_upper_unlink:
1749 bond_upper_dev_unlink(bond, new_slave);
1751 err_unregister:
1752 netdev_rx_handler_unregister(slave_dev);
1754 err_detach:
1755 vlan_vids_del_by_dev(slave_dev, bond_dev);
1756 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1757 RCU_INIT_POINTER(bond->primary_slave, NULL);
1758 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1759 block_netpoll_tx();
1760 bond_change_active_slave(bond, NULL);
1761 bond_select_active_slave(bond);
1762 unblock_netpoll_tx();
1764 /* either primary_slave or curr_active_slave might've changed */
1765 synchronize_rcu();
1766 slave_disable_netpoll(new_slave);
1768 err_close:
1769 slave_dev->priv_flags &= ~IFF_BONDING;
1770 dev_close(slave_dev);
1772 err_restore_mac:
1773 slave_dev->flags &= ~IFF_SLAVE;
1774 if (!bond->params.fail_over_mac ||
1775 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1776 /* XXX TODO - fom follow mode needs to change master's
1777 * MAC if this slave's MAC is in use by the bond, or at
1778 * least print a warning.
1780 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1781 addr.sa_family = slave_dev->type;
1782 dev_set_mac_address(slave_dev, &addr);
1785 err_restore_mtu:
1786 dev_set_mtu(slave_dev, new_slave->original_mtu);
1788 err_free:
1789 bond_free_slave(new_slave);
1791 err_undo_flags:
1792 /* Enslave of first slave has failed and we need to fix master's mac */
1793 if (!bond_has_slaves(bond)) {
1794 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1795 slave_dev->dev_addr))
1796 eth_hw_addr_random(bond_dev);
1797 if (bond_dev->type != ARPHRD_ETHER) {
1798 dev_close(bond_dev);
1799 ether_setup(bond_dev);
1800 bond_dev->flags |= IFF_MASTER;
1801 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1805 return res;
1808 /* Try to release the slave device <slave> from the bond device <master>
1809 * It is legal to access curr_active_slave without a lock because all the function
1810 * is RTNL-locked. If "all" is true it means that the function is being called
1811 * while destroying a bond interface and all slaves are being released.
1813 * The rules for slave state should be:
1814 * for Active/Backup:
1815 * Active stays on all backups go down
1816 * for Bonded connections:
1817 * The first up interface should be left on and all others downed.
1819 static int __bond_release_one(struct net_device *bond_dev,
1820 struct net_device *slave_dev,
1821 bool all)
1823 struct bonding *bond = netdev_priv(bond_dev);
1824 struct slave *slave, *oldcurrent;
1825 struct sockaddr addr;
1826 int old_flags = bond_dev->flags;
1827 netdev_features_t old_features = bond_dev->features;
1829 /* slave is not a slave or master is not master of this slave */
1830 if (!(slave_dev->flags & IFF_SLAVE) ||
1831 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1832 netdev_dbg(bond_dev, "cannot release %s\n",
1833 slave_dev->name);
1834 return -EINVAL;
1837 block_netpoll_tx();
1839 slave = bond_get_slave_by_dev(bond, slave_dev);
1840 if (!slave) {
1841 /* not a slave of this bond */
1842 netdev_info(bond_dev, "%s not enslaved\n",
1843 slave_dev->name);
1844 unblock_netpoll_tx();
1845 return -EINVAL;
1848 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1850 bond_sysfs_slave_del(slave);
1852 /* recompute stats just before removing the slave */
1853 bond_get_stats(bond->dev, &bond->bond_stats);
1855 bond_upper_dev_unlink(bond, slave);
1856 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1857 * for this slave anymore.
1859 netdev_rx_handler_unregister(slave_dev);
1861 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1862 bond_3ad_unbind_slave(slave);
1864 if (bond_mode_uses_xmit_hash(bond))
1865 bond_update_slave_arr(bond, slave);
1867 netdev_info(bond_dev, "Releasing %s interface %s\n",
1868 bond_is_active_slave(slave) ? "active" : "backup",
1869 slave_dev->name);
1871 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1873 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1875 if (!all && (!bond->params.fail_over_mac ||
1876 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1877 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1878 bond_has_slaves(bond))
1879 netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
1880 slave_dev->name, slave->perm_hwaddr,
1881 bond_dev->name, slave_dev->name);
1884 if (rtnl_dereference(bond->primary_slave) == slave)
1885 RCU_INIT_POINTER(bond->primary_slave, NULL);
1887 if (oldcurrent == slave)
1888 bond_change_active_slave(bond, NULL);
1890 if (bond_is_lb(bond)) {
1891 /* Must be called only after the slave has been
1892 * detached from the list and the curr_active_slave
1893 * has been cleared (if our_slave == old_current),
1894 * but before a new active slave is selected.
1896 bond_alb_deinit_slave(bond, slave);
1899 if (all) {
1900 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1901 } else if (oldcurrent == slave) {
1902 /* Note that we hold RTNL over this sequence, so there
1903 * is no concern that another slave add/remove event
1904 * will interfere.
1906 bond_select_active_slave(bond);
1909 if (!bond_has_slaves(bond)) {
1910 bond_set_carrier(bond);
1911 eth_hw_addr_random(bond_dev);
1914 unblock_netpoll_tx();
1915 synchronize_rcu();
1916 bond->slave_cnt--;
1918 if (!bond_has_slaves(bond)) {
1919 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1920 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1923 bond_compute_features(bond);
1924 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1925 (old_features & NETIF_F_VLAN_CHALLENGED))
1926 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1927 slave_dev->name, bond_dev->name);
1929 vlan_vids_del_by_dev(slave_dev, bond_dev);
1931 /* If the mode uses primary, then this case was handled above by
1932 * bond_change_active_slave(..., NULL)
1934 if (!bond_uses_primary(bond)) {
1935 /* unset promiscuity level from slave
1936 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1937 * of the IFF_PROMISC flag in the bond_dev, but we need the
1938 * value of that flag before that change, as that was the value
1939 * when this slave was attached, so we cache at the start of the
1940 * function and use it here. Same goes for ALLMULTI below
1942 if (old_flags & IFF_PROMISC)
1943 dev_set_promiscuity(slave_dev, -1);
1945 /* unset allmulti level from slave */
1946 if (old_flags & IFF_ALLMULTI)
1947 dev_set_allmulti(slave_dev, -1);
1949 bond_hw_addr_flush(bond_dev, slave_dev);
1952 slave_disable_netpoll(slave);
1954 /* close slave before restoring its mac address */
1955 dev_close(slave_dev);
1957 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1958 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1959 /* restore original ("permanent") mac address */
1960 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1961 addr.sa_family = slave_dev->type;
1962 dev_set_mac_address(slave_dev, &addr);
1965 dev_set_mtu(slave_dev, slave->original_mtu);
1967 slave_dev->priv_flags &= ~IFF_BONDING;
1969 bond_free_slave(slave);
1971 return 0;
1974 /* A wrapper used because of ndo_del_link */
1975 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1977 return __bond_release_one(bond_dev, slave_dev, false);
1980 /* First release a slave and then destroy the bond if no more slaves are left.
1981 * Must be under rtnl_lock when this function is called.
1983 static int bond_release_and_destroy(struct net_device *bond_dev,
1984 struct net_device *slave_dev)
1986 struct bonding *bond = netdev_priv(bond_dev);
1987 int ret;
1989 ret = bond_release(bond_dev, slave_dev);
1990 if (ret == 0 && !bond_has_slaves(bond)) {
1991 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1992 netdev_info(bond_dev, "Destroying bond %s\n",
1993 bond_dev->name);
1994 bond_remove_proc_entry(bond);
1995 unregister_netdevice(bond_dev);
1997 return ret;
2000 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2002 struct bonding *bond = netdev_priv(bond_dev);
2003 bond_fill_ifbond(bond, info);
2004 return 0;
2007 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2009 struct bonding *bond = netdev_priv(bond_dev);
2010 struct list_head *iter;
2011 int i = 0, res = -ENODEV;
2012 struct slave *slave;
2014 bond_for_each_slave(bond, slave, iter) {
2015 if (i++ == (int)info->slave_id) {
2016 res = 0;
2017 bond_fill_ifslave(slave, info);
2018 break;
2022 return res;
2025 /*-------------------------------- Monitoring -------------------------------*/
2027 /* called with rcu_read_lock() */
2028 static int bond_miimon_inspect(struct bonding *bond)
2030 int link_state, commit = 0;
2031 struct list_head *iter;
2032 struct slave *slave;
2033 bool ignore_updelay;
2035 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2037 bond_for_each_slave_rcu(bond, slave, iter) {
2038 slave->new_link = BOND_LINK_NOCHANGE;
2040 link_state = bond_check_dev_link(bond, slave->dev, 0);
2042 switch (slave->link) {
2043 case BOND_LINK_UP:
2044 if (link_state)
2045 continue;
2047 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2048 BOND_SLAVE_NOTIFY_LATER);
2049 slave->delay = bond->params.downdelay;
2050 if (slave->delay) {
2051 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2052 (BOND_MODE(bond) ==
2053 BOND_MODE_ACTIVEBACKUP) ?
2054 (bond_is_active_slave(slave) ?
2055 "active " : "backup ") : "",
2056 slave->dev->name,
2057 bond->params.downdelay * bond->params.miimon);
2059 /*FALLTHRU*/
2060 case BOND_LINK_FAIL:
2061 if (link_state) {
2062 /* recovered before downdelay expired */
2063 bond_set_slave_link_state(slave, BOND_LINK_UP,
2064 BOND_SLAVE_NOTIFY_LATER);
2065 slave->last_link_up = jiffies;
2066 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2067 (bond->params.downdelay - slave->delay) *
2068 bond->params.miimon,
2069 slave->dev->name);
2070 commit++;
2071 continue;
2074 if (slave->delay <= 0) {
2075 slave->new_link = BOND_LINK_DOWN;
2076 commit++;
2077 continue;
2080 slave->delay--;
2081 break;
2083 case BOND_LINK_DOWN:
2084 if (!link_state)
2085 continue;
2087 bond_set_slave_link_state(slave, BOND_LINK_BACK,
2088 BOND_SLAVE_NOTIFY_LATER);
2089 slave->delay = bond->params.updelay;
2091 if (slave->delay) {
2092 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2093 slave->dev->name,
2094 ignore_updelay ? 0 :
2095 bond->params.updelay *
2096 bond->params.miimon);
2098 /*FALLTHRU*/
2099 case BOND_LINK_BACK:
2100 if (!link_state) {
2101 bond_set_slave_link_state(slave,
2102 BOND_LINK_DOWN,
2103 BOND_SLAVE_NOTIFY_LATER);
2104 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2105 (bond->params.updelay - slave->delay) *
2106 bond->params.miimon,
2107 slave->dev->name);
2108 commit++;
2109 continue;
2112 if (ignore_updelay)
2113 slave->delay = 0;
2115 if (slave->delay <= 0) {
2116 slave->new_link = BOND_LINK_UP;
2117 commit++;
2118 ignore_updelay = false;
2119 continue;
2122 slave->delay--;
2123 break;
2127 return commit;
2130 static void bond_miimon_commit(struct bonding *bond)
2132 struct list_head *iter;
2133 struct slave *slave, *primary;
2135 bond_for_each_slave(bond, slave, iter) {
2136 switch (slave->new_link) {
2137 case BOND_LINK_NOCHANGE:
2138 continue;
2140 case BOND_LINK_UP:
2141 bond_update_speed_duplex(slave);
2142 bond_set_slave_link_state(slave, BOND_LINK_UP,
2143 BOND_SLAVE_NOTIFY_NOW);
2144 slave->last_link_up = jiffies;
2146 primary = rtnl_dereference(bond->primary_slave);
2147 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2148 /* prevent it from being the active one */
2149 bond_set_backup_slave(slave);
2150 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2151 /* make it immediately active */
2152 bond_set_active_slave(slave);
2153 } else if (slave != primary) {
2154 /* prevent it from being the active one */
2155 bond_set_backup_slave(slave);
2158 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2159 slave->dev->name,
2160 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2161 slave->duplex ? "full" : "half");
2163 /* notify ad that the link status has changed */
2164 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2165 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2167 if (bond_is_lb(bond))
2168 bond_alb_handle_link_change(bond, slave,
2169 BOND_LINK_UP);
2171 if (BOND_MODE(bond) == BOND_MODE_XOR)
2172 bond_update_slave_arr(bond, NULL);
2174 if (!bond->curr_active_slave || slave == primary)
2175 goto do_failover;
2177 continue;
2179 case BOND_LINK_DOWN:
2180 if (slave->link_failure_count < UINT_MAX)
2181 slave->link_failure_count++;
2183 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2184 BOND_SLAVE_NOTIFY_NOW);
2186 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2187 BOND_MODE(bond) == BOND_MODE_8023AD)
2188 bond_set_slave_inactive_flags(slave,
2189 BOND_SLAVE_NOTIFY_NOW);
2191 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2192 slave->dev->name);
2194 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2195 bond_3ad_handle_link_change(slave,
2196 BOND_LINK_DOWN);
2198 if (bond_is_lb(bond))
2199 bond_alb_handle_link_change(bond, slave,
2200 BOND_LINK_DOWN);
2202 if (BOND_MODE(bond) == BOND_MODE_XOR)
2203 bond_update_slave_arr(bond, NULL);
2205 if (slave == rcu_access_pointer(bond->curr_active_slave))
2206 goto do_failover;
2208 continue;
2210 default:
2211 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2212 slave->new_link, slave->dev->name);
2213 slave->new_link = BOND_LINK_NOCHANGE;
2215 continue;
2218 do_failover:
2219 block_netpoll_tx();
2220 bond_select_active_slave(bond);
2221 unblock_netpoll_tx();
2224 bond_set_carrier(bond);
2227 /* bond_mii_monitor
2229 * Really a wrapper that splits the mii monitor into two phases: an
2230 * inspection, then (if inspection indicates something needs to be done)
2231 * an acquisition of appropriate locks followed by a commit phase to
2232 * implement whatever link state changes are indicated.
2234 static void bond_mii_monitor(struct work_struct *work)
2236 struct bonding *bond = container_of(work, struct bonding,
2237 mii_work.work);
2238 bool should_notify_peers = false;
2239 unsigned long delay;
2241 delay = msecs_to_jiffies(bond->params.miimon);
2243 if (!bond_has_slaves(bond))
2244 goto re_arm;
2246 rcu_read_lock();
2248 should_notify_peers = bond_should_notify_peers(bond);
2250 if (bond_miimon_inspect(bond)) {
2251 rcu_read_unlock();
2253 /* Race avoidance with bond_close cancel of workqueue */
2254 if (!rtnl_trylock()) {
2255 delay = 1;
2256 should_notify_peers = false;
2257 goto re_arm;
2260 bond_miimon_commit(bond);
2262 rtnl_unlock(); /* might sleep, hold no other locks */
2263 } else
2264 rcu_read_unlock();
2266 re_arm:
2267 if (bond->params.miimon)
2268 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2270 if (should_notify_peers) {
2271 if (!rtnl_trylock())
2272 return;
2273 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2274 rtnl_unlock();
2278 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2280 struct net_device *upper;
2281 struct list_head *iter;
2282 bool ret = false;
2284 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2285 return true;
2287 rcu_read_lock();
2288 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2289 if (ip == bond_confirm_addr(upper, 0, ip)) {
2290 ret = true;
2291 break;
2294 rcu_read_unlock();
2296 return ret;
2299 /* We go to the (large) trouble of VLAN tagging ARP frames because
2300 * switches in VLAN mode (especially if ports are configured as
2301 * "native" to a VLAN) might not pass non-tagged frames.
2303 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2304 __be32 dest_ip, __be32 src_ip,
2305 struct bond_vlan_tag *tags)
2307 struct sk_buff *skb;
2308 struct bond_vlan_tag *outer_tag = tags;
2310 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2311 arp_op, slave_dev->name, &dest_ip, &src_ip);
2313 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2314 NULL, slave_dev->dev_addr, NULL);
2316 if (!skb) {
2317 net_err_ratelimited("ARP packet allocation failed\n");
2318 return;
2321 if (!tags || tags->vlan_proto == VLAN_N_VID)
2322 goto xmit;
2324 tags++;
2326 /* Go through all the tags backwards and add them to the packet */
2327 while (tags->vlan_proto != VLAN_N_VID) {
2328 if (!tags->vlan_id) {
2329 tags++;
2330 continue;
2333 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2334 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2335 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2336 tags->vlan_id);
2337 if (!skb) {
2338 net_err_ratelimited("failed to insert inner VLAN tag\n");
2339 return;
2342 tags++;
2344 /* Set the outer tag */
2345 if (outer_tag->vlan_id) {
2346 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2347 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2348 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2349 outer_tag->vlan_id);
2352 xmit:
2353 arp_xmit(skb);
2356 /* Validate the device path between the @start_dev and the @end_dev.
2357 * The path is valid if the @end_dev is reachable through device
2358 * stacking.
2359 * When the path is validated, collect any vlan information in the
2360 * path.
2362 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2363 struct net_device *end_dev,
2364 int level)
2366 struct bond_vlan_tag *tags;
2367 struct net_device *upper;
2368 struct list_head *iter;
2370 if (start_dev == end_dev) {
2371 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2372 if (!tags)
2373 return ERR_PTR(-ENOMEM);
2374 tags[level].vlan_proto = VLAN_N_VID;
2375 return tags;
2378 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2379 tags = bond_verify_device_path(upper, end_dev, level + 1);
2380 if (IS_ERR_OR_NULL(tags)) {
2381 if (IS_ERR(tags))
2382 return tags;
2383 continue;
2385 if (is_vlan_dev(upper)) {
2386 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2387 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2390 return tags;
2393 return NULL;
2396 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2398 struct rtable *rt;
2399 struct bond_vlan_tag *tags;
2400 __be32 *targets = bond->params.arp_targets, addr;
2401 int i;
2403 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2404 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2405 tags = NULL;
2407 /* Find out through which dev should the packet go */
2408 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2409 RTO_ONLINK, 0);
2410 if (IS_ERR(rt)) {
2411 /* there's no route to target - try to send arp
2412 * probe to generate any traffic (arp_validate=0)
2414 if (bond->params.arp_validate)
2415 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2416 bond->dev->name,
2417 &targets[i]);
2418 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2419 0, tags);
2420 continue;
2423 /* bond device itself */
2424 if (rt->dst.dev == bond->dev)
2425 goto found;
2427 rcu_read_lock();
2428 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2429 rcu_read_unlock();
2431 if (!IS_ERR_OR_NULL(tags))
2432 goto found;
2434 /* Not our device - skip */
2435 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2436 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2438 ip_rt_put(rt);
2439 continue;
2441 found:
2442 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2443 ip_rt_put(rt);
2444 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2445 addr, tags);
2446 kfree(tags);
2450 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2452 int i;
2454 if (!sip || !bond_has_this_ip(bond, tip)) {
2455 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2456 &sip, &tip);
2457 return;
2460 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2461 if (i == -1) {
2462 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2463 &sip);
2464 return;
2466 slave->last_rx = jiffies;
2467 slave->target_last_arp_rx[i] = jiffies;
2470 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2471 struct slave *slave)
2473 struct arphdr *arp = (struct arphdr *)skb->data;
2474 struct slave *curr_active_slave, *curr_arp_slave;
2475 unsigned char *arp_ptr;
2476 __be32 sip, tip;
2477 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2479 if (!slave_do_arp_validate(bond, slave)) {
2480 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2481 !slave_do_arp_validate_only(bond))
2482 slave->last_rx = jiffies;
2483 return RX_HANDLER_ANOTHER;
2484 } else if (!is_arp) {
2485 return RX_HANDLER_ANOTHER;
2488 alen = arp_hdr_len(bond->dev);
2490 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2491 skb->dev->name);
2493 if (alen > skb_headlen(skb)) {
2494 arp = kmalloc(alen, GFP_ATOMIC);
2495 if (!arp)
2496 goto out_unlock;
2497 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2498 goto out_unlock;
2501 if (arp->ar_hln != bond->dev->addr_len ||
2502 skb->pkt_type == PACKET_OTHERHOST ||
2503 skb->pkt_type == PACKET_LOOPBACK ||
2504 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2505 arp->ar_pro != htons(ETH_P_IP) ||
2506 arp->ar_pln != 4)
2507 goto out_unlock;
2509 arp_ptr = (unsigned char *)(arp + 1);
2510 arp_ptr += bond->dev->addr_len;
2511 memcpy(&sip, arp_ptr, 4);
2512 arp_ptr += 4 + bond->dev->addr_len;
2513 memcpy(&tip, arp_ptr, 4);
2515 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2516 slave->dev->name, bond_slave_state(slave),
2517 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2518 &sip, &tip);
2520 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2521 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2523 /* We 'trust' the received ARP enough to validate it if:
2525 * (a) the slave receiving the ARP is active (which includes the
2526 * current ARP slave, if any), or
2528 * (b) the receiving slave isn't active, but there is a currently
2529 * active slave and it received valid arp reply(s) after it became
2530 * the currently active slave, or
2532 * (c) there is an ARP slave that sent an ARP during the prior ARP
2533 * interval, and we receive an ARP reply on any slave. We accept
2534 * these because switch FDB update delays may deliver the ARP
2535 * reply to a slave other than the sender of the ARP request.
2537 * Note: for (b), backup slaves are receiving the broadcast ARP
2538 * request, not a reply. This request passes from the sending
2539 * slave through the L2 switch(es) to the receiving slave. Since
2540 * this is checking the request, sip/tip are swapped for
2541 * validation.
2543 * This is done to avoid endless looping when we can't reach the
2544 * arp_ip_target and fool ourselves with our own arp requests.
2546 if (bond_is_active_slave(slave))
2547 bond_validate_arp(bond, slave, sip, tip);
2548 else if (curr_active_slave &&
2549 time_after(slave_last_rx(bond, curr_active_slave),
2550 curr_active_slave->last_link_up))
2551 bond_validate_arp(bond, slave, tip, sip);
2552 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2553 bond_time_in_interval(bond,
2554 dev_trans_start(curr_arp_slave->dev), 1))
2555 bond_validate_arp(bond, slave, sip, tip);
2557 out_unlock:
2558 if (arp != (struct arphdr *)skb->data)
2559 kfree(arp);
2560 return RX_HANDLER_ANOTHER;
2563 /* function to verify if we're in the arp_interval timeslice, returns true if
2564 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2565 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2567 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2568 int mod)
2570 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2572 return time_in_range(jiffies,
2573 last_act - delta_in_ticks,
2574 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2577 /* This function is called regularly to monitor each slave's link
2578 * ensuring that traffic is being sent and received when arp monitoring
2579 * is used in load-balancing mode. if the adapter has been dormant, then an
2580 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2581 * arp monitoring in active backup mode.
2583 static void bond_loadbalance_arp_mon(struct work_struct *work)
2585 struct bonding *bond = container_of(work, struct bonding,
2586 arp_work.work);
2587 struct slave *slave, *oldcurrent;
2588 struct list_head *iter;
2589 int do_failover = 0, slave_state_changed = 0;
2591 if (!bond_has_slaves(bond))
2592 goto re_arm;
2594 rcu_read_lock();
2596 oldcurrent = rcu_dereference(bond->curr_active_slave);
2597 /* see if any of the previous devices are up now (i.e. they have
2598 * xmt and rcv traffic). the curr_active_slave does not come into
2599 * the picture unless it is null. also, slave->last_link_up is not
2600 * needed here because we send an arp on each slave and give a slave
2601 * as long as it needs to get the tx/rx within the delta.
2602 * TODO: what about up/down delay in arp mode? it wasn't here before
2603 * so it can wait
2605 bond_for_each_slave_rcu(bond, slave, iter) {
2606 unsigned long trans_start = dev_trans_start(slave->dev);
2608 slave->new_link = BOND_LINK_NOCHANGE;
2610 if (slave->link != BOND_LINK_UP) {
2611 if (bond_time_in_interval(bond, trans_start, 1) &&
2612 bond_time_in_interval(bond, slave->last_rx, 1)) {
2614 slave->new_link = BOND_LINK_UP;
2615 slave_state_changed = 1;
2617 /* primary_slave has no meaning in round-robin
2618 * mode. the window of a slave being up and
2619 * curr_active_slave being null after enslaving
2620 * is closed.
2622 if (!oldcurrent) {
2623 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2624 slave->dev->name);
2625 do_failover = 1;
2626 } else {
2627 netdev_info(bond->dev, "interface %s is now up\n",
2628 slave->dev->name);
2631 } else {
2632 /* slave->link == BOND_LINK_UP */
2634 /* not all switches will respond to an arp request
2635 * when the source ip is 0, so don't take the link down
2636 * if we don't know our ip yet
2638 if (!bond_time_in_interval(bond, trans_start, 2) ||
2639 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2641 slave->new_link = BOND_LINK_DOWN;
2642 slave_state_changed = 1;
2644 if (slave->link_failure_count < UINT_MAX)
2645 slave->link_failure_count++;
2647 netdev_info(bond->dev, "interface %s is now down\n",
2648 slave->dev->name);
2650 if (slave == oldcurrent)
2651 do_failover = 1;
2655 /* note: if switch is in round-robin mode, all links
2656 * must tx arp to ensure all links rx an arp - otherwise
2657 * links may oscillate or not come up at all; if switch is
2658 * in something like xor mode, there is nothing we can
2659 * do - all replies will be rx'ed on same link causing slaves
2660 * to be unstable during low/no traffic periods
2662 if (bond_slave_is_up(slave))
2663 bond_arp_send_all(bond, slave);
2666 rcu_read_unlock();
2668 if (do_failover || slave_state_changed) {
2669 if (!rtnl_trylock())
2670 goto re_arm;
2672 bond_for_each_slave(bond, slave, iter) {
2673 if (slave->new_link != BOND_LINK_NOCHANGE)
2674 slave->link = slave->new_link;
2677 if (slave_state_changed) {
2678 bond_slave_state_change(bond);
2679 if (BOND_MODE(bond) == BOND_MODE_XOR)
2680 bond_update_slave_arr(bond, NULL);
2682 if (do_failover) {
2683 block_netpoll_tx();
2684 bond_select_active_slave(bond);
2685 unblock_netpoll_tx();
2687 rtnl_unlock();
2690 re_arm:
2691 if (bond->params.arp_interval)
2692 queue_delayed_work(bond->wq, &bond->arp_work,
2693 msecs_to_jiffies(bond->params.arp_interval));
2696 /* Called to inspect slaves for active-backup mode ARP monitor link state
2697 * changes. Sets new_link in slaves to specify what action should take
2698 * place for the slave. Returns 0 if no changes are found, >0 if changes
2699 * to link states must be committed.
2701 * Called with rcu_read_lock held.
2703 static int bond_ab_arp_inspect(struct bonding *bond)
2705 unsigned long trans_start, last_rx;
2706 struct list_head *iter;
2707 struct slave *slave;
2708 int commit = 0;
2710 bond_for_each_slave_rcu(bond, slave, iter) {
2711 slave->new_link = BOND_LINK_NOCHANGE;
2712 last_rx = slave_last_rx(bond, slave);
2714 if (slave->link != BOND_LINK_UP) {
2715 if (bond_time_in_interval(bond, last_rx, 1)) {
2716 slave->new_link = BOND_LINK_UP;
2717 commit++;
2719 continue;
2722 /* Give slaves 2*delta after being enslaved or made
2723 * active. This avoids bouncing, as the last receive
2724 * times need a full ARP monitor cycle to be updated.
2726 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2727 continue;
2729 /* Backup slave is down if:
2730 * - No current_arp_slave AND
2731 * - more than 3*delta since last receive AND
2732 * - the bond has an IP address
2734 * Note: a non-null current_arp_slave indicates
2735 * the curr_active_slave went down and we are
2736 * searching for a new one; under this condition
2737 * we only take the curr_active_slave down - this
2738 * gives each slave a chance to tx/rx traffic
2739 * before being taken out
2741 if (!bond_is_active_slave(slave) &&
2742 !rcu_access_pointer(bond->current_arp_slave) &&
2743 !bond_time_in_interval(bond, last_rx, 3)) {
2744 slave->new_link = BOND_LINK_DOWN;
2745 commit++;
2748 /* Active slave is down if:
2749 * - more than 2*delta since transmitting OR
2750 * - (more than 2*delta since receive AND
2751 * the bond has an IP address)
2753 trans_start = dev_trans_start(slave->dev);
2754 if (bond_is_active_slave(slave) &&
2755 (!bond_time_in_interval(bond, trans_start, 2) ||
2756 !bond_time_in_interval(bond, last_rx, 2))) {
2757 slave->new_link = BOND_LINK_DOWN;
2758 commit++;
2762 return commit;
2765 /* Called to commit link state changes noted by inspection step of
2766 * active-backup mode ARP monitor.
2768 * Called with RTNL hold.
2770 static void bond_ab_arp_commit(struct bonding *bond)
2772 unsigned long trans_start;
2773 struct list_head *iter;
2774 struct slave *slave;
2776 bond_for_each_slave(bond, slave, iter) {
2777 switch (slave->new_link) {
2778 case BOND_LINK_NOCHANGE:
2779 continue;
2781 case BOND_LINK_UP:
2782 trans_start = dev_trans_start(slave->dev);
2783 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2784 (!rtnl_dereference(bond->curr_active_slave) &&
2785 bond_time_in_interval(bond, trans_start, 1))) {
2786 struct slave *current_arp_slave;
2788 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2789 bond_set_slave_link_state(slave, BOND_LINK_UP,
2790 BOND_SLAVE_NOTIFY_NOW);
2791 if (current_arp_slave) {
2792 bond_set_slave_inactive_flags(
2793 current_arp_slave,
2794 BOND_SLAVE_NOTIFY_NOW);
2795 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2798 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2799 slave->dev->name);
2801 if (!rtnl_dereference(bond->curr_active_slave) ||
2802 slave == rtnl_dereference(bond->primary_slave))
2803 goto do_failover;
2807 continue;
2809 case BOND_LINK_DOWN:
2810 if (slave->link_failure_count < UINT_MAX)
2811 slave->link_failure_count++;
2813 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2814 BOND_SLAVE_NOTIFY_NOW);
2815 bond_set_slave_inactive_flags(slave,
2816 BOND_SLAVE_NOTIFY_NOW);
2818 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2819 slave->dev->name);
2821 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2822 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2823 goto do_failover;
2826 continue;
2828 default:
2829 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2830 slave->new_link, slave->dev->name);
2831 continue;
2834 do_failover:
2835 block_netpoll_tx();
2836 bond_select_active_slave(bond);
2837 unblock_netpoll_tx();
2840 bond_set_carrier(bond);
2843 /* Send ARP probes for active-backup mode ARP monitor.
2845 * Called with rcu_read_lock held.
2847 static bool bond_ab_arp_probe(struct bonding *bond)
2849 struct slave *slave, *before = NULL, *new_slave = NULL,
2850 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2851 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2852 struct list_head *iter;
2853 bool found = false;
2854 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2856 if (curr_arp_slave && curr_active_slave)
2857 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2858 curr_arp_slave->dev->name,
2859 curr_active_slave->dev->name);
2861 if (curr_active_slave) {
2862 bond_arp_send_all(bond, curr_active_slave);
2863 return should_notify_rtnl;
2866 /* if we don't have a curr_active_slave, search for the next available
2867 * backup slave from the current_arp_slave and make it the candidate
2868 * for becoming the curr_active_slave
2871 if (!curr_arp_slave) {
2872 curr_arp_slave = bond_first_slave_rcu(bond);
2873 if (!curr_arp_slave)
2874 return should_notify_rtnl;
2877 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2879 bond_for_each_slave_rcu(bond, slave, iter) {
2880 if (!found && !before && bond_slave_is_up(slave))
2881 before = slave;
2883 if (found && !new_slave && bond_slave_is_up(slave))
2884 new_slave = slave;
2885 /* if the link state is up at this point, we
2886 * mark it down - this can happen if we have
2887 * simultaneous link failures and
2888 * reselect_active_interface doesn't make this
2889 * one the current slave so it is still marked
2890 * up when it is actually down
2892 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2893 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2894 BOND_SLAVE_NOTIFY_LATER);
2895 if (slave->link_failure_count < UINT_MAX)
2896 slave->link_failure_count++;
2898 bond_set_slave_inactive_flags(slave,
2899 BOND_SLAVE_NOTIFY_LATER);
2901 netdev_info(bond->dev, "backup interface %s is now down\n",
2902 slave->dev->name);
2904 if (slave == curr_arp_slave)
2905 found = true;
2908 if (!new_slave && before)
2909 new_slave = before;
2911 if (!new_slave)
2912 goto check_state;
2914 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2915 BOND_SLAVE_NOTIFY_LATER);
2916 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2917 bond_arp_send_all(bond, new_slave);
2918 new_slave->last_link_up = jiffies;
2919 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2921 check_state:
2922 bond_for_each_slave_rcu(bond, slave, iter) {
2923 if (slave->should_notify || slave->should_notify_link) {
2924 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2925 break;
2928 return should_notify_rtnl;
2931 static void bond_activebackup_arp_mon(struct work_struct *work)
2933 struct bonding *bond = container_of(work, struct bonding,
2934 arp_work.work);
2935 bool should_notify_peers = false;
2936 bool should_notify_rtnl = false;
2937 int delta_in_ticks;
2939 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2941 if (!bond_has_slaves(bond))
2942 goto re_arm;
2944 rcu_read_lock();
2946 should_notify_peers = bond_should_notify_peers(bond);
2948 if (bond_ab_arp_inspect(bond)) {
2949 rcu_read_unlock();
2951 /* Race avoidance with bond_close flush of workqueue */
2952 if (!rtnl_trylock()) {
2953 delta_in_ticks = 1;
2954 should_notify_peers = false;
2955 goto re_arm;
2958 bond_ab_arp_commit(bond);
2960 rtnl_unlock();
2961 rcu_read_lock();
2964 should_notify_rtnl = bond_ab_arp_probe(bond);
2965 rcu_read_unlock();
2967 re_arm:
2968 if (bond->params.arp_interval)
2969 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2971 if (should_notify_peers || should_notify_rtnl) {
2972 if (!rtnl_trylock())
2973 return;
2975 if (should_notify_peers)
2976 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2977 bond->dev);
2978 if (should_notify_rtnl) {
2979 bond_slave_state_notify(bond);
2980 bond_slave_link_notify(bond);
2983 rtnl_unlock();
2987 /*-------------------------- netdev event handling --------------------------*/
2989 /* Change device name */
2990 static int bond_event_changename(struct bonding *bond)
2992 bond_remove_proc_entry(bond);
2993 bond_create_proc_entry(bond);
2995 bond_debug_reregister(bond);
2997 return NOTIFY_DONE;
3000 static int bond_master_netdev_event(unsigned long event,
3001 struct net_device *bond_dev)
3003 struct bonding *event_bond = netdev_priv(bond_dev);
3005 switch (event) {
3006 case NETDEV_CHANGENAME:
3007 return bond_event_changename(event_bond);
3008 case NETDEV_UNREGISTER:
3009 bond_remove_proc_entry(event_bond);
3010 break;
3011 case NETDEV_REGISTER:
3012 bond_create_proc_entry(event_bond);
3013 break;
3014 case NETDEV_NOTIFY_PEERS:
3015 if (event_bond->send_peer_notif)
3016 event_bond->send_peer_notif--;
3017 break;
3018 default:
3019 break;
3022 return NOTIFY_DONE;
3025 static int bond_slave_netdev_event(unsigned long event,
3026 struct net_device *slave_dev)
3028 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3029 struct bonding *bond;
3030 struct net_device *bond_dev;
3032 /* A netdev event can be generated while enslaving a device
3033 * before netdev_rx_handler_register is called in which case
3034 * slave will be NULL
3036 if (!slave)
3037 return NOTIFY_DONE;
3038 bond_dev = slave->bond->dev;
3039 bond = slave->bond;
3040 primary = rtnl_dereference(bond->primary_slave);
3042 switch (event) {
3043 case NETDEV_UNREGISTER:
3044 if (bond_dev->type != ARPHRD_ETHER)
3045 bond_release_and_destroy(bond_dev, slave_dev);
3046 else
3047 bond_release(bond_dev, slave_dev);
3048 break;
3049 case NETDEV_UP:
3050 case NETDEV_CHANGE:
3051 bond_update_speed_duplex(slave);
3052 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3053 bond_3ad_adapter_speed_duplex_changed(slave);
3054 /* Fallthrough */
3055 case NETDEV_DOWN:
3056 /* Refresh slave-array if applicable!
3057 * If the setup does not use miimon or arpmon (mode-specific!),
3058 * then these events will not cause the slave-array to be
3059 * refreshed. This will cause xmit to use a slave that is not
3060 * usable. Avoid such situation by refeshing the array at these
3061 * events. If these (miimon/arpmon) parameters are configured
3062 * then array gets refreshed twice and that should be fine!
3064 if (bond_mode_uses_xmit_hash(bond))
3065 bond_update_slave_arr(bond, NULL);
3066 break;
3067 case NETDEV_CHANGEMTU:
3068 /* TODO: Should slaves be allowed to
3069 * independently alter their MTU? For
3070 * an active-backup bond, slaves need
3071 * not be the same type of device, so
3072 * MTUs may vary. For other modes,
3073 * slaves arguably should have the
3074 * same MTUs. To do this, we'd need to
3075 * take over the slave's change_mtu
3076 * function for the duration of their
3077 * servitude.
3079 break;
3080 case NETDEV_CHANGENAME:
3081 /* we don't care if we don't have primary set */
3082 if (!bond_uses_primary(bond) ||
3083 !bond->params.primary[0])
3084 break;
3086 if (slave == primary) {
3087 /* slave's name changed - he's no longer primary */
3088 RCU_INIT_POINTER(bond->primary_slave, NULL);
3089 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3090 /* we have a new primary slave */
3091 rcu_assign_pointer(bond->primary_slave, slave);
3092 } else { /* we didn't change primary - exit */
3093 break;
3096 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3097 primary ? slave_dev->name : "none");
3099 block_netpoll_tx();
3100 bond_select_active_slave(bond);
3101 unblock_netpoll_tx();
3102 break;
3103 case NETDEV_FEAT_CHANGE:
3104 bond_compute_features(bond);
3105 break;
3106 case NETDEV_RESEND_IGMP:
3107 /* Propagate to master device */
3108 call_netdevice_notifiers(event, slave->bond->dev);
3109 break;
3110 default:
3111 break;
3114 return NOTIFY_DONE;
3117 /* bond_netdev_event: handle netdev notifier chain events.
3119 * This function receives events for the netdev chain. The caller (an
3120 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3121 * locks for us to safely manipulate the slave devices (RTNL lock,
3122 * dev_probe_lock).
3124 static int bond_netdev_event(struct notifier_block *this,
3125 unsigned long event, void *ptr)
3127 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3129 netdev_dbg(event_dev, "event: %lx\n", event);
3131 if (!(event_dev->priv_flags & IFF_BONDING))
3132 return NOTIFY_DONE;
3134 if (event_dev->flags & IFF_MASTER) {
3135 netdev_dbg(event_dev, "IFF_MASTER\n");
3136 return bond_master_netdev_event(event, event_dev);
3139 if (event_dev->flags & IFF_SLAVE) {
3140 netdev_dbg(event_dev, "IFF_SLAVE\n");
3141 return bond_slave_netdev_event(event, event_dev);
3144 return NOTIFY_DONE;
3147 static struct notifier_block bond_netdev_notifier = {
3148 .notifier_call = bond_netdev_event,
3151 /*---------------------------- Hashing Policies -----------------------------*/
3153 /* L2 hash helper */
3154 static inline u32 bond_eth_hash(struct sk_buff *skb)
3156 struct ethhdr *ep, hdr_tmp;
3158 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3159 if (ep)
3160 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3161 return 0;
3164 /* Extract the appropriate headers based on bond's xmit policy */
3165 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3166 struct flow_keys *fk)
3168 const struct ipv6hdr *iph6;
3169 const struct iphdr *iph;
3170 int noff, proto = -1;
3172 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3173 return skb_flow_dissect_flow_keys(skb, fk, 0);
3175 fk->ports.ports = 0;
3176 noff = skb_network_offset(skb);
3177 if (skb->protocol == htons(ETH_P_IP)) {
3178 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3179 return false;
3180 iph = ip_hdr(skb);
3181 iph_to_flow_copy_v4addrs(fk, iph);
3182 noff += iph->ihl << 2;
3183 if (!ip_is_fragment(iph))
3184 proto = iph->protocol;
3185 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3186 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3187 return false;
3188 iph6 = ipv6_hdr(skb);
3189 iph_to_flow_copy_v6addrs(fk, iph6);
3190 noff += sizeof(*iph6);
3191 proto = iph6->nexthdr;
3192 } else {
3193 return false;
3195 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3196 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3198 return true;
3202 * bond_xmit_hash - generate a hash value based on the xmit policy
3203 * @bond: bonding device
3204 * @skb: buffer to use for headers
3206 * This function will extract the necessary headers from the skb buffer and use
3207 * them to generate a hash based on the xmit_policy set in the bonding device
3209 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3211 struct flow_keys flow;
3212 u32 hash;
3214 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3215 skb->l4_hash)
3216 return skb->hash;
3218 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3219 !bond_flow_dissect(bond, skb, &flow))
3220 return bond_eth_hash(skb);
3222 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3223 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3224 hash = bond_eth_hash(skb);
3225 else
3226 hash = (__force u32)flow.ports.ports;
3227 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3228 (__force u32)flow_get_u32_src(&flow);
3229 hash ^= (hash >> 16);
3230 hash ^= (hash >> 8);
3232 return hash >> 1;
3235 /*-------------------------- Device entry points ----------------------------*/
3237 static void bond_work_init_all(struct bonding *bond)
3239 INIT_DELAYED_WORK(&bond->mcast_work,
3240 bond_resend_igmp_join_requests_delayed);
3241 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3242 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3243 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3244 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3245 else
3246 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3247 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3248 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3251 static void bond_work_cancel_all(struct bonding *bond)
3253 cancel_delayed_work_sync(&bond->mii_work);
3254 cancel_delayed_work_sync(&bond->arp_work);
3255 cancel_delayed_work_sync(&bond->alb_work);
3256 cancel_delayed_work_sync(&bond->ad_work);
3257 cancel_delayed_work_sync(&bond->mcast_work);
3258 cancel_delayed_work_sync(&bond->slave_arr_work);
3261 static int bond_open(struct net_device *bond_dev)
3263 struct bonding *bond = netdev_priv(bond_dev);
3264 struct list_head *iter;
3265 struct slave *slave;
3267 /* reset slave->backup and slave->inactive */
3268 if (bond_has_slaves(bond)) {
3269 bond_for_each_slave(bond, slave, iter) {
3270 if (bond_uses_primary(bond) &&
3271 slave != rcu_access_pointer(bond->curr_active_slave)) {
3272 bond_set_slave_inactive_flags(slave,
3273 BOND_SLAVE_NOTIFY_NOW);
3274 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3275 bond_set_slave_active_flags(slave,
3276 BOND_SLAVE_NOTIFY_NOW);
3281 bond_work_init_all(bond);
3283 if (bond_is_lb(bond)) {
3284 /* bond_alb_initialize must be called before the timer
3285 * is started.
3287 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3288 return -ENOMEM;
3289 if (bond->params.tlb_dynamic_lb)
3290 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3293 if (bond->params.miimon) /* link check interval, in milliseconds. */
3294 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3296 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3297 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3298 bond->recv_probe = bond_arp_rcv;
3301 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3302 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3303 /* register to receive LACPDUs */
3304 bond->recv_probe = bond_3ad_lacpdu_recv;
3305 bond_3ad_initiate_agg_selection(bond, 1);
3308 if (bond_mode_uses_xmit_hash(bond))
3309 bond_update_slave_arr(bond, NULL);
3311 return 0;
3314 static int bond_close(struct net_device *bond_dev)
3316 struct bonding *bond = netdev_priv(bond_dev);
3318 bond_work_cancel_all(bond);
3319 bond->send_peer_notif = 0;
3320 if (bond_is_lb(bond))
3321 bond_alb_deinitialize(bond);
3322 bond->recv_probe = NULL;
3324 return 0;
3327 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3328 * that some drivers can provide 32bit values only.
3330 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3331 const struct rtnl_link_stats64 *_new,
3332 const struct rtnl_link_stats64 *_old)
3334 const u64 *new = (const u64 *)_new;
3335 const u64 *old = (const u64 *)_old;
3336 u64 *res = (u64 *)_res;
3337 int i;
3339 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3340 u64 nv = new[i];
3341 u64 ov = old[i];
3342 s64 delta = nv - ov;
3344 /* detects if this particular field is 32bit only */
3345 if (((nv | ov) >> 32) == 0)
3346 delta = (s64)(s32)((u32)nv - (u32)ov);
3348 /* filter anomalies, some drivers reset their stats
3349 * at down/up events.
3351 if (delta > 0)
3352 res[i] += delta;
3356 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3357 struct rtnl_link_stats64 *stats)
3359 struct bonding *bond = netdev_priv(bond_dev);
3360 struct rtnl_link_stats64 temp;
3361 struct list_head *iter;
3362 struct slave *slave;
3364 spin_lock(&bond->stats_lock);
3365 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3367 rcu_read_lock();
3368 bond_for_each_slave_rcu(bond, slave, iter) {
3369 const struct rtnl_link_stats64 *new =
3370 dev_get_stats(slave->dev, &temp);
3372 bond_fold_stats(stats, new, &slave->slave_stats);
3374 /* save off the slave stats for the next run */
3375 memcpy(&slave->slave_stats, new, sizeof(*new));
3377 rcu_read_unlock();
3379 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3380 spin_unlock(&bond->stats_lock);
3382 return stats;
3385 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3387 struct bonding *bond = netdev_priv(bond_dev);
3388 struct net_device *slave_dev = NULL;
3389 struct ifbond k_binfo;
3390 struct ifbond __user *u_binfo = NULL;
3391 struct ifslave k_sinfo;
3392 struct ifslave __user *u_sinfo = NULL;
3393 struct mii_ioctl_data *mii = NULL;
3394 struct bond_opt_value newval;
3395 struct net *net;
3396 int res = 0;
3398 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3400 switch (cmd) {
3401 case SIOCGMIIPHY:
3402 mii = if_mii(ifr);
3403 if (!mii)
3404 return -EINVAL;
3406 mii->phy_id = 0;
3407 /* Fall Through */
3408 case SIOCGMIIREG:
3409 /* We do this again just in case we were called by SIOCGMIIREG
3410 * instead of SIOCGMIIPHY.
3412 mii = if_mii(ifr);
3413 if (!mii)
3414 return -EINVAL;
3416 if (mii->reg_num == 1) {
3417 mii->val_out = 0;
3418 if (netif_carrier_ok(bond->dev))
3419 mii->val_out = BMSR_LSTATUS;
3422 return 0;
3423 case BOND_INFO_QUERY_OLD:
3424 case SIOCBONDINFOQUERY:
3425 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3427 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3428 return -EFAULT;
3430 res = bond_info_query(bond_dev, &k_binfo);
3431 if (res == 0 &&
3432 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3433 return -EFAULT;
3435 return res;
3436 case BOND_SLAVE_INFO_QUERY_OLD:
3437 case SIOCBONDSLAVEINFOQUERY:
3438 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3440 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3441 return -EFAULT;
3443 res = bond_slave_info_query(bond_dev, &k_sinfo);
3444 if (res == 0 &&
3445 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3446 return -EFAULT;
3448 return res;
3449 default:
3450 break;
3453 net = dev_net(bond_dev);
3455 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3456 return -EPERM;
3458 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3460 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3462 if (!slave_dev)
3463 return -ENODEV;
3465 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3466 switch (cmd) {
3467 case BOND_ENSLAVE_OLD:
3468 case SIOCBONDENSLAVE:
3469 res = bond_enslave(bond_dev, slave_dev);
3470 break;
3471 case BOND_RELEASE_OLD:
3472 case SIOCBONDRELEASE:
3473 res = bond_release(bond_dev, slave_dev);
3474 break;
3475 case BOND_SETHWADDR_OLD:
3476 case SIOCBONDSETHWADDR:
3477 bond_set_dev_addr(bond_dev, slave_dev);
3478 res = 0;
3479 break;
3480 case BOND_CHANGE_ACTIVE_OLD:
3481 case SIOCBONDCHANGEACTIVE:
3482 bond_opt_initstr(&newval, slave_dev->name);
3483 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3484 break;
3485 default:
3486 res = -EOPNOTSUPP;
3489 return res;
3492 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3494 struct bonding *bond = netdev_priv(bond_dev);
3496 if (change & IFF_PROMISC)
3497 bond_set_promiscuity(bond,
3498 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3500 if (change & IFF_ALLMULTI)
3501 bond_set_allmulti(bond,
3502 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3505 static void bond_set_rx_mode(struct net_device *bond_dev)
3507 struct bonding *bond = netdev_priv(bond_dev);
3508 struct list_head *iter;
3509 struct slave *slave;
3511 rcu_read_lock();
3512 if (bond_uses_primary(bond)) {
3513 slave = rcu_dereference(bond->curr_active_slave);
3514 if (slave) {
3515 dev_uc_sync(slave->dev, bond_dev);
3516 dev_mc_sync(slave->dev, bond_dev);
3518 } else {
3519 bond_for_each_slave_rcu(bond, slave, iter) {
3520 dev_uc_sync_multiple(slave->dev, bond_dev);
3521 dev_mc_sync_multiple(slave->dev, bond_dev);
3524 rcu_read_unlock();
3527 static int bond_neigh_init(struct neighbour *n)
3529 struct bonding *bond = netdev_priv(n->dev);
3530 const struct net_device_ops *slave_ops;
3531 struct neigh_parms parms;
3532 struct slave *slave;
3533 int ret;
3535 slave = bond_first_slave(bond);
3536 if (!slave)
3537 return 0;
3538 slave_ops = slave->dev->netdev_ops;
3539 if (!slave_ops->ndo_neigh_setup)
3540 return 0;
3542 parms.neigh_setup = NULL;
3543 parms.neigh_cleanup = NULL;
3544 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3545 if (ret)
3546 return ret;
3548 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3549 * after the last slave has been detached. Assumes that all slaves
3550 * utilize the same neigh_cleanup (true at this writing as only user
3551 * is ipoib).
3553 n->parms->neigh_cleanup = parms.neigh_cleanup;
3555 if (!parms.neigh_setup)
3556 return 0;
3558 return parms.neigh_setup(n);
3561 /* The bonding ndo_neigh_setup is called at init time beofre any
3562 * slave exists. So we must declare proxy setup function which will
3563 * be used at run time to resolve the actual slave neigh param setup.
3565 * It's also called by master devices (such as vlans) to setup their
3566 * underlying devices. In that case - do nothing, we're already set up from
3567 * our init.
3569 static int bond_neigh_setup(struct net_device *dev,
3570 struct neigh_parms *parms)
3572 /* modify only our neigh_parms */
3573 if (parms->dev == dev)
3574 parms->neigh_setup = bond_neigh_init;
3576 return 0;
3579 /* Change the MTU of all of a master's slaves to match the master */
3580 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3582 struct bonding *bond = netdev_priv(bond_dev);
3583 struct slave *slave, *rollback_slave;
3584 struct list_head *iter;
3585 int res = 0;
3587 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3589 bond_for_each_slave(bond, slave, iter) {
3590 netdev_dbg(bond_dev, "s %p c_m %p\n",
3591 slave, slave->dev->netdev_ops->ndo_change_mtu);
3593 res = dev_set_mtu(slave->dev, new_mtu);
3595 if (res) {
3596 /* If we failed to set the slave's mtu to the new value
3597 * we must abort the operation even in ACTIVE_BACKUP
3598 * mode, because if we allow the backup slaves to have
3599 * different mtu values than the active slave we'll
3600 * need to change their mtu when doing a failover. That
3601 * means changing their mtu from timer context, which
3602 * is probably not a good idea.
3604 netdev_dbg(bond_dev, "err %d %s\n", res,
3605 slave->dev->name);
3606 goto unwind;
3610 bond_dev->mtu = new_mtu;
3612 return 0;
3614 unwind:
3615 /* unwind from head to the slave that failed */
3616 bond_for_each_slave(bond, rollback_slave, iter) {
3617 int tmp_res;
3619 if (rollback_slave == slave)
3620 break;
3622 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3623 if (tmp_res) {
3624 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3625 tmp_res, rollback_slave->dev->name);
3629 return res;
3632 /* Change HW address
3634 * Note that many devices must be down to change the HW address, and
3635 * downing the master releases all slaves. We can make bonds full of
3636 * bonding devices to test this, however.
3638 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3640 struct bonding *bond = netdev_priv(bond_dev);
3641 struct slave *slave, *rollback_slave;
3642 struct sockaddr *sa = addr, tmp_sa;
3643 struct list_head *iter;
3644 int res = 0;
3646 if (BOND_MODE(bond) == BOND_MODE_ALB)
3647 return bond_alb_set_mac_address(bond_dev, addr);
3650 netdev_dbg(bond_dev, "bond=%p\n", bond);
3652 /* If fail_over_mac is enabled, do nothing and return success.
3653 * Returning an error causes ifenslave to fail.
3655 if (bond->params.fail_over_mac &&
3656 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3657 return 0;
3659 if (!is_valid_ether_addr(sa->sa_data))
3660 return -EADDRNOTAVAIL;
3662 bond_for_each_slave(bond, slave, iter) {
3663 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3664 res = dev_set_mac_address(slave->dev, addr);
3665 if (res) {
3666 /* TODO: consider downing the slave
3667 * and retry ?
3668 * User should expect communications
3669 * breakage anyway until ARP finish
3670 * updating, so...
3672 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3673 goto unwind;
3677 /* success */
3678 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3679 return 0;
3681 unwind:
3682 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3683 tmp_sa.sa_family = bond_dev->type;
3685 /* unwind from head to the slave that failed */
3686 bond_for_each_slave(bond, rollback_slave, iter) {
3687 int tmp_res;
3689 if (rollback_slave == slave)
3690 break;
3692 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3693 if (tmp_res) {
3694 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3695 tmp_res, rollback_slave->dev->name);
3699 return res;
3703 * bond_xmit_slave_id - transmit skb through slave with slave_id
3704 * @bond: bonding device that is transmitting
3705 * @skb: buffer to transmit
3706 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3708 * This function tries to transmit through slave with slave_id but in case
3709 * it fails, it tries to find the first available slave for transmission.
3710 * The skb is consumed in all cases, thus the function is void.
3712 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3714 struct list_head *iter;
3715 struct slave *slave;
3716 int i = slave_id;
3718 /* Here we start from the slave with slave_id */
3719 bond_for_each_slave_rcu(bond, slave, iter) {
3720 if (--i < 0) {
3721 if (bond_slave_can_tx(slave)) {
3722 bond_dev_queue_xmit(bond, skb, slave->dev);
3723 return;
3728 /* Here we start from the first slave up to slave_id */
3729 i = slave_id;
3730 bond_for_each_slave_rcu(bond, slave, iter) {
3731 if (--i < 0)
3732 break;
3733 if (bond_slave_can_tx(slave)) {
3734 bond_dev_queue_xmit(bond, skb, slave->dev);
3735 return;
3738 /* no slave that can tx has been found */
3739 bond_tx_drop(bond->dev, skb);
3743 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3744 * @bond: bonding device to use
3746 * Based on the value of the bonding device's packets_per_slave parameter
3747 * this function generates a slave id, which is usually used as the next
3748 * slave to transmit through.
3750 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3752 u32 slave_id;
3753 struct reciprocal_value reciprocal_packets_per_slave;
3754 int packets_per_slave = bond->params.packets_per_slave;
3756 switch (packets_per_slave) {
3757 case 0:
3758 slave_id = prandom_u32();
3759 break;
3760 case 1:
3761 slave_id = bond->rr_tx_counter;
3762 break;
3763 default:
3764 reciprocal_packets_per_slave =
3765 bond->params.reciprocal_packets_per_slave;
3766 slave_id = reciprocal_divide(bond->rr_tx_counter,
3767 reciprocal_packets_per_slave);
3768 break;
3770 bond->rr_tx_counter++;
3772 return slave_id;
3775 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3777 struct bonding *bond = netdev_priv(bond_dev);
3778 struct iphdr *iph = ip_hdr(skb);
3779 struct slave *slave;
3780 u32 slave_id;
3782 /* Start with the curr_active_slave that joined the bond as the
3783 * default for sending IGMP traffic. For failover purposes one
3784 * needs to maintain some consistency for the interface that will
3785 * send the join/membership reports. The curr_active_slave found
3786 * will send all of this type of traffic.
3788 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3789 slave = rcu_dereference(bond->curr_active_slave);
3790 if (slave)
3791 bond_dev_queue_xmit(bond, skb, slave->dev);
3792 else
3793 bond_xmit_slave_id(bond, skb, 0);
3794 } else {
3795 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3797 if (likely(slave_cnt)) {
3798 slave_id = bond_rr_gen_slave_id(bond);
3799 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3800 } else {
3801 bond_tx_drop(bond_dev, skb);
3805 return NETDEV_TX_OK;
3808 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3809 * the bond has a usable interface.
3811 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3813 struct bonding *bond = netdev_priv(bond_dev);
3814 struct slave *slave;
3816 slave = rcu_dereference(bond->curr_active_slave);
3817 if (slave)
3818 bond_dev_queue_xmit(bond, skb, slave->dev);
3819 else
3820 bond_tx_drop(bond_dev, skb);
3822 return NETDEV_TX_OK;
3825 /* Use this to update slave_array when (a) it's not appropriate to update
3826 * slave_array right away (note that update_slave_array() may sleep)
3827 * and / or (b) RTNL is not held.
3829 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3831 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3834 /* Slave array work handler. Holds only RTNL */
3835 static void bond_slave_arr_handler(struct work_struct *work)
3837 struct bonding *bond = container_of(work, struct bonding,
3838 slave_arr_work.work);
3839 int ret;
3841 if (!rtnl_trylock())
3842 goto err;
3844 ret = bond_update_slave_arr(bond, NULL);
3845 rtnl_unlock();
3846 if (ret) {
3847 pr_warn_ratelimited("Failed to update slave array from WT\n");
3848 goto err;
3850 return;
3852 err:
3853 bond_slave_arr_work_rearm(bond, 1);
3856 /* Build the usable slaves array in control path for modes that use xmit-hash
3857 * to determine the slave interface -
3858 * (a) BOND_MODE_8023AD
3859 * (b) BOND_MODE_XOR
3860 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3862 * The caller is expected to hold RTNL only and NO other lock!
3864 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3866 struct slave *slave;
3867 struct list_head *iter;
3868 struct bond_up_slave *new_arr, *old_arr;
3869 int agg_id = 0;
3870 int ret = 0;
3872 #ifdef CONFIG_LOCKDEP
3873 WARN_ON(lockdep_is_held(&bond->mode_lock));
3874 #endif
3876 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3877 GFP_KERNEL);
3878 if (!new_arr) {
3879 ret = -ENOMEM;
3880 pr_err("Failed to build slave-array.\n");
3881 goto out;
3883 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3884 struct ad_info ad_info;
3886 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3887 pr_debug("bond_3ad_get_active_agg_info failed\n");
3888 kfree_rcu(new_arr, rcu);
3889 /* No active aggragator means it's not safe to use
3890 * the previous array.
3892 old_arr = rtnl_dereference(bond->slave_arr);
3893 if (old_arr) {
3894 RCU_INIT_POINTER(bond->slave_arr, NULL);
3895 kfree_rcu(old_arr, rcu);
3897 goto out;
3899 agg_id = ad_info.aggregator_id;
3901 bond_for_each_slave(bond, slave, iter) {
3902 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3903 struct aggregator *agg;
3905 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3906 if (!agg || agg->aggregator_identifier != agg_id)
3907 continue;
3909 if (!bond_slave_can_tx(slave))
3910 continue;
3911 if (skipslave == slave)
3912 continue;
3913 new_arr->arr[new_arr->count++] = slave;
3916 old_arr = rtnl_dereference(bond->slave_arr);
3917 rcu_assign_pointer(bond->slave_arr, new_arr);
3918 if (old_arr)
3919 kfree_rcu(old_arr, rcu);
3920 out:
3921 if (ret != 0 && skipslave) {
3922 int idx;
3924 /* Rare situation where caller has asked to skip a specific
3925 * slave but allocation failed (most likely!). BTW this is
3926 * only possible when the call is initiated from
3927 * __bond_release_one(). In this situation; overwrite the
3928 * skipslave entry in the array with the last entry from the
3929 * array to avoid a situation where the xmit path may choose
3930 * this to-be-skipped slave to send a packet out.
3932 old_arr = rtnl_dereference(bond->slave_arr);
3933 for (idx = 0; idx < old_arr->count; idx++) {
3934 if (skipslave == old_arr->arr[idx]) {
3935 old_arr->arr[idx] =
3936 old_arr->arr[old_arr->count-1];
3937 old_arr->count--;
3938 break;
3942 return ret;
3945 /* Use this Xmit function for 3AD as well as XOR modes. The current
3946 * usable slave array is formed in the control path. The xmit function
3947 * just calculates hash and sends the packet out.
3949 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3951 struct bonding *bond = netdev_priv(dev);
3952 struct slave *slave;
3953 struct bond_up_slave *slaves;
3954 unsigned int count;
3956 slaves = rcu_dereference(bond->slave_arr);
3957 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3958 if (likely(count)) {
3959 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3960 bond_dev_queue_xmit(bond, skb, slave->dev);
3961 } else {
3962 bond_tx_drop(dev, skb);
3965 return NETDEV_TX_OK;
3968 /* in broadcast mode, we send everything to all usable interfaces. */
3969 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3971 struct bonding *bond = netdev_priv(bond_dev);
3972 struct slave *slave = NULL;
3973 struct list_head *iter;
3975 bond_for_each_slave_rcu(bond, slave, iter) {
3976 if (bond_is_last_slave(bond, slave))
3977 break;
3978 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3979 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3981 if (!skb2) {
3982 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3983 bond_dev->name, __func__);
3984 continue;
3986 bond_dev_queue_xmit(bond, skb2, slave->dev);
3989 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3990 bond_dev_queue_xmit(bond, skb, slave->dev);
3991 else
3992 bond_tx_drop(bond_dev, skb);
3994 return NETDEV_TX_OK;
3997 /*------------------------- Device initialization ---------------------------*/
3999 /* Lookup the slave that corresponds to a qid */
4000 static inline int bond_slave_override(struct bonding *bond,
4001 struct sk_buff *skb)
4003 struct slave *slave = NULL;
4004 struct list_head *iter;
4006 if (!skb->queue_mapping)
4007 return 1;
4009 /* Find out if any slaves have the same mapping as this skb. */
4010 bond_for_each_slave_rcu(bond, slave, iter) {
4011 if (slave->queue_id == skb->queue_mapping) {
4012 if (bond_slave_is_up(slave) &&
4013 slave->link == BOND_LINK_UP) {
4014 bond_dev_queue_xmit(bond, skb, slave->dev);
4015 return 0;
4017 /* If the slave isn't UP, use default transmit policy. */
4018 break;
4022 return 1;
4026 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4027 void *accel_priv, select_queue_fallback_t fallback)
4029 /* This helper function exists to help dev_pick_tx get the correct
4030 * destination queue. Using a helper function skips a call to
4031 * skb_tx_hash and will put the skbs in the queue we expect on their
4032 * way down to the bonding driver.
4034 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4036 /* Save the original txq to restore before passing to the driver */
4037 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4039 if (unlikely(txq >= dev->real_num_tx_queues)) {
4040 do {
4041 txq -= dev->real_num_tx_queues;
4042 } while (txq >= dev->real_num_tx_queues);
4044 return txq;
4047 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4049 struct bonding *bond = netdev_priv(dev);
4051 if (bond_should_override_tx_queue(bond) &&
4052 !bond_slave_override(bond, skb))
4053 return NETDEV_TX_OK;
4055 switch (BOND_MODE(bond)) {
4056 case BOND_MODE_ROUNDROBIN:
4057 return bond_xmit_roundrobin(skb, dev);
4058 case BOND_MODE_ACTIVEBACKUP:
4059 return bond_xmit_activebackup(skb, dev);
4060 case BOND_MODE_8023AD:
4061 case BOND_MODE_XOR:
4062 return bond_3ad_xor_xmit(skb, dev);
4063 case BOND_MODE_BROADCAST:
4064 return bond_xmit_broadcast(skb, dev);
4065 case BOND_MODE_ALB:
4066 return bond_alb_xmit(skb, dev);
4067 case BOND_MODE_TLB:
4068 return bond_tlb_xmit(skb, dev);
4069 default:
4070 /* Should never happen, mode already checked */
4071 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4072 WARN_ON_ONCE(1);
4073 bond_tx_drop(dev, skb);
4074 return NETDEV_TX_OK;
4078 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4080 struct bonding *bond = netdev_priv(dev);
4081 netdev_tx_t ret = NETDEV_TX_OK;
4083 /* If we risk deadlock from transmitting this in the
4084 * netpoll path, tell netpoll to queue the frame for later tx
4086 if (unlikely(is_netpoll_tx_blocked(dev)))
4087 return NETDEV_TX_BUSY;
4089 rcu_read_lock();
4090 if (bond_has_slaves(bond))
4091 ret = __bond_start_xmit(skb, dev);
4092 else
4093 bond_tx_drop(dev, skb);
4094 rcu_read_unlock();
4096 return ret;
4099 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4100 struct ethtool_cmd *ecmd)
4102 struct bonding *bond = netdev_priv(bond_dev);
4103 unsigned long speed = 0;
4104 struct list_head *iter;
4105 struct slave *slave;
4107 ecmd->duplex = DUPLEX_UNKNOWN;
4108 ecmd->port = PORT_OTHER;
4110 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4111 * do not need to check mode. Though link speed might not represent
4112 * the true receive or transmit bandwidth (not all modes are symmetric)
4113 * this is an accurate maximum.
4115 bond_for_each_slave(bond, slave, iter) {
4116 if (bond_slave_can_tx(slave)) {
4117 if (slave->speed != SPEED_UNKNOWN)
4118 speed += slave->speed;
4119 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4120 slave->duplex != DUPLEX_UNKNOWN)
4121 ecmd->duplex = slave->duplex;
4124 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4126 return 0;
4129 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4130 struct ethtool_drvinfo *drvinfo)
4132 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4133 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4134 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4135 BOND_ABI_VERSION);
4138 static const struct ethtool_ops bond_ethtool_ops = {
4139 .get_drvinfo = bond_ethtool_get_drvinfo,
4140 .get_settings = bond_ethtool_get_settings,
4141 .get_link = ethtool_op_get_link,
4144 static const struct net_device_ops bond_netdev_ops = {
4145 .ndo_init = bond_init,
4146 .ndo_uninit = bond_uninit,
4147 .ndo_open = bond_open,
4148 .ndo_stop = bond_close,
4149 .ndo_start_xmit = bond_start_xmit,
4150 .ndo_select_queue = bond_select_queue,
4151 .ndo_get_stats64 = bond_get_stats,
4152 .ndo_do_ioctl = bond_do_ioctl,
4153 .ndo_change_rx_flags = bond_change_rx_flags,
4154 .ndo_set_rx_mode = bond_set_rx_mode,
4155 .ndo_change_mtu = bond_change_mtu,
4156 .ndo_set_mac_address = bond_set_mac_address,
4157 .ndo_neigh_setup = bond_neigh_setup,
4158 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4159 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4160 #ifdef CONFIG_NET_POLL_CONTROLLER
4161 .ndo_netpoll_setup = bond_netpoll_setup,
4162 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4163 .ndo_poll_controller = bond_poll_controller,
4164 #endif
4165 .ndo_add_slave = bond_enslave,
4166 .ndo_del_slave = bond_release,
4167 .ndo_fix_features = bond_fix_features,
4168 .ndo_neigh_construct = netdev_default_l2upper_neigh_construct,
4169 .ndo_neigh_destroy = netdev_default_l2upper_neigh_destroy,
4170 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4171 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4172 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4173 .ndo_fdb_add = switchdev_port_fdb_add,
4174 .ndo_fdb_del = switchdev_port_fdb_del,
4175 .ndo_fdb_dump = switchdev_port_fdb_dump,
4176 .ndo_features_check = passthru_features_check,
4179 static const struct device_type bond_type = {
4180 .name = "bond",
4183 static void bond_destructor(struct net_device *bond_dev)
4185 struct bonding *bond = netdev_priv(bond_dev);
4186 if (bond->wq)
4187 destroy_workqueue(bond->wq);
4188 free_netdev(bond_dev);
4191 void bond_setup(struct net_device *bond_dev)
4193 struct bonding *bond = netdev_priv(bond_dev);
4195 spin_lock_init(&bond->mode_lock);
4196 spin_lock_init(&bond->stats_lock);
4197 bond->params = bonding_defaults;
4199 /* Initialize pointers */
4200 bond->dev = bond_dev;
4202 /* Initialize the device entry points */
4203 ether_setup(bond_dev);
4204 bond_dev->netdev_ops = &bond_netdev_ops;
4205 bond_dev->ethtool_ops = &bond_ethtool_ops;
4207 bond_dev->destructor = bond_destructor;
4209 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4211 /* Initialize the device options */
4212 bond_dev->flags |= IFF_MASTER;
4213 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4214 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4216 /* don't acquire bond device's netif_tx_lock when transmitting */
4217 bond_dev->features |= NETIF_F_LLTX;
4219 /* By default, we declare the bond to be fully
4220 * VLAN hardware accelerated capable. Special
4221 * care is taken in the various xmit functions
4222 * when there are slaves that are not hw accel
4223 * capable
4226 /* Don't allow bond devices to change network namespaces. */
4227 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4229 bond_dev->hw_features = BOND_VLAN_FEATURES |
4230 NETIF_F_HW_VLAN_CTAG_TX |
4231 NETIF_F_HW_VLAN_CTAG_RX |
4232 NETIF_F_HW_VLAN_CTAG_FILTER;
4234 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4235 bond_dev->features |= bond_dev->hw_features;
4238 /* Destroy a bonding device.
4239 * Must be under rtnl_lock when this function is called.
4241 static void bond_uninit(struct net_device *bond_dev)
4243 struct bonding *bond = netdev_priv(bond_dev);
4244 struct list_head *iter;
4245 struct slave *slave;
4246 struct bond_up_slave *arr;
4248 bond_netpoll_cleanup(bond_dev);
4250 /* Release the bonded slaves */
4251 bond_for_each_slave(bond, slave, iter)
4252 __bond_release_one(bond_dev, slave->dev, true);
4253 netdev_info(bond_dev, "Released all slaves\n");
4255 arr = rtnl_dereference(bond->slave_arr);
4256 if (arr) {
4257 RCU_INIT_POINTER(bond->slave_arr, NULL);
4258 kfree_rcu(arr, rcu);
4261 list_del(&bond->bond_list);
4263 bond_debug_unregister(bond);
4266 /*------------------------- Module initialization ---------------------------*/
4268 static int bond_check_params(struct bond_params *params)
4270 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4271 struct bond_opt_value newval;
4272 const struct bond_opt_value *valptr;
4273 int arp_all_targets_value;
4274 u16 ad_actor_sys_prio = 0;
4275 u16 ad_user_port_key = 0;
4277 /* Convert string parameters. */
4278 if (mode) {
4279 bond_opt_initstr(&newval, mode);
4280 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4281 if (!valptr) {
4282 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4283 return -EINVAL;
4285 bond_mode = valptr->value;
4288 if (xmit_hash_policy) {
4289 if ((bond_mode != BOND_MODE_XOR) &&
4290 (bond_mode != BOND_MODE_8023AD) &&
4291 (bond_mode != BOND_MODE_TLB)) {
4292 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4293 bond_mode_name(bond_mode));
4294 } else {
4295 bond_opt_initstr(&newval, xmit_hash_policy);
4296 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4297 &newval);
4298 if (!valptr) {
4299 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4300 xmit_hash_policy);
4301 return -EINVAL;
4303 xmit_hashtype = valptr->value;
4307 if (lacp_rate) {
4308 if (bond_mode != BOND_MODE_8023AD) {
4309 pr_info("lacp_rate param is irrelevant in mode %s\n",
4310 bond_mode_name(bond_mode));
4311 } else {
4312 bond_opt_initstr(&newval, lacp_rate);
4313 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4314 &newval);
4315 if (!valptr) {
4316 pr_err("Error: Invalid lacp rate \"%s\"\n",
4317 lacp_rate);
4318 return -EINVAL;
4320 lacp_fast = valptr->value;
4324 if (ad_select) {
4325 bond_opt_initstr(&newval, ad_select);
4326 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4327 &newval);
4328 if (!valptr) {
4329 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4330 return -EINVAL;
4332 params->ad_select = valptr->value;
4333 if (bond_mode != BOND_MODE_8023AD)
4334 pr_warn("ad_select param only affects 802.3ad mode\n");
4335 } else {
4336 params->ad_select = BOND_AD_STABLE;
4339 if (max_bonds < 0) {
4340 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4341 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4342 max_bonds = BOND_DEFAULT_MAX_BONDS;
4345 if (miimon < 0) {
4346 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4347 miimon, INT_MAX);
4348 miimon = 0;
4351 if (updelay < 0) {
4352 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4353 updelay, INT_MAX);
4354 updelay = 0;
4357 if (downdelay < 0) {
4358 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4359 downdelay, INT_MAX);
4360 downdelay = 0;
4363 if ((use_carrier != 0) && (use_carrier != 1)) {
4364 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4365 use_carrier);
4366 use_carrier = 1;
4369 if (num_peer_notif < 0 || num_peer_notif > 255) {
4370 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4371 num_peer_notif);
4372 num_peer_notif = 1;
4375 /* reset values for 802.3ad/TLB/ALB */
4376 if (!bond_mode_uses_arp(bond_mode)) {
4377 if (!miimon) {
4378 pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4379 pr_warn("Forcing miimon to 100msec\n");
4380 miimon = BOND_DEFAULT_MIIMON;
4384 if (tx_queues < 1 || tx_queues > 255) {
4385 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4386 tx_queues, BOND_DEFAULT_TX_QUEUES);
4387 tx_queues = BOND_DEFAULT_TX_QUEUES;
4390 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4391 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4392 all_slaves_active);
4393 all_slaves_active = 0;
4396 if (resend_igmp < 0 || resend_igmp > 255) {
4397 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4398 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4399 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4402 bond_opt_initval(&newval, packets_per_slave);
4403 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4404 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4405 packets_per_slave, USHRT_MAX);
4406 packets_per_slave = 1;
4409 if (bond_mode == BOND_MODE_ALB) {
4410 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4411 updelay);
4414 if (!miimon) {
4415 if (updelay || downdelay) {
4416 /* just warn the user the up/down delay will have
4417 * no effect since miimon is zero...
4419 pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4420 updelay, downdelay);
4422 } else {
4423 /* don't allow arp monitoring */
4424 if (arp_interval) {
4425 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4426 miimon, arp_interval);
4427 arp_interval = 0;
4430 if ((updelay % miimon) != 0) {
4431 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4432 updelay, miimon, (updelay / miimon) * miimon);
4435 updelay /= miimon;
4437 if ((downdelay % miimon) != 0) {
4438 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4439 downdelay, miimon,
4440 (downdelay / miimon) * miimon);
4443 downdelay /= miimon;
4446 if (arp_interval < 0) {
4447 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4448 arp_interval, INT_MAX);
4449 arp_interval = 0;
4452 for (arp_ip_count = 0, i = 0;
4453 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4454 __be32 ip;
4456 /* not a complete check, but good enough to catch mistakes */
4457 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4458 !bond_is_ip_target_ok(ip)) {
4459 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4460 arp_ip_target[i]);
4461 arp_interval = 0;
4462 } else {
4463 if (bond_get_targets_ip(arp_target, ip) == -1)
4464 arp_target[arp_ip_count++] = ip;
4465 else
4466 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4467 &ip);
4471 if (arp_interval && !arp_ip_count) {
4472 /* don't allow arping if no arp_ip_target given... */
4473 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4474 arp_interval);
4475 arp_interval = 0;
4478 if (arp_validate) {
4479 if (!arp_interval) {
4480 pr_err("arp_validate requires arp_interval\n");
4481 return -EINVAL;
4484 bond_opt_initstr(&newval, arp_validate);
4485 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4486 &newval);
4487 if (!valptr) {
4488 pr_err("Error: invalid arp_validate \"%s\"\n",
4489 arp_validate);
4490 return -EINVAL;
4492 arp_validate_value = valptr->value;
4493 } else {
4494 arp_validate_value = 0;
4497 arp_all_targets_value = 0;
4498 if (arp_all_targets) {
4499 bond_opt_initstr(&newval, arp_all_targets);
4500 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4501 &newval);
4502 if (!valptr) {
4503 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4504 arp_all_targets);
4505 arp_all_targets_value = 0;
4506 } else {
4507 arp_all_targets_value = valptr->value;
4511 if (miimon) {
4512 pr_info("MII link monitoring set to %d ms\n", miimon);
4513 } else if (arp_interval) {
4514 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4515 arp_validate_value);
4516 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4517 arp_interval, valptr->string, arp_ip_count);
4519 for (i = 0; i < arp_ip_count; i++)
4520 pr_cont(" %s", arp_ip_target[i]);
4522 pr_cont("\n");
4524 } else if (max_bonds) {
4525 /* miimon and arp_interval not set, we need one so things
4526 * work as expected, see bonding.txt for details
4528 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
4531 if (primary && !bond_mode_uses_primary(bond_mode)) {
4532 /* currently, using a primary only makes sense
4533 * in active backup, TLB or ALB modes
4535 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4536 primary, bond_mode_name(bond_mode));
4537 primary = NULL;
4540 if (primary && primary_reselect) {
4541 bond_opt_initstr(&newval, primary_reselect);
4542 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4543 &newval);
4544 if (!valptr) {
4545 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4546 primary_reselect);
4547 return -EINVAL;
4549 primary_reselect_value = valptr->value;
4550 } else {
4551 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4554 if (fail_over_mac) {
4555 bond_opt_initstr(&newval, fail_over_mac);
4556 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4557 &newval);
4558 if (!valptr) {
4559 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4560 fail_over_mac);
4561 return -EINVAL;
4563 fail_over_mac_value = valptr->value;
4564 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4565 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4566 } else {
4567 fail_over_mac_value = BOND_FOM_NONE;
4570 bond_opt_initstr(&newval, "default");
4571 valptr = bond_opt_parse(
4572 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4573 &newval);
4574 if (!valptr) {
4575 pr_err("Error: No ad_actor_sys_prio default value");
4576 return -EINVAL;
4578 ad_actor_sys_prio = valptr->value;
4580 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4581 &newval);
4582 if (!valptr) {
4583 pr_err("Error: No ad_user_port_key default value");
4584 return -EINVAL;
4586 ad_user_port_key = valptr->value;
4588 if (lp_interval == 0) {
4589 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4590 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4591 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4594 /* fill params struct with the proper values */
4595 params->mode = bond_mode;
4596 params->xmit_policy = xmit_hashtype;
4597 params->miimon = miimon;
4598 params->num_peer_notif = num_peer_notif;
4599 params->arp_interval = arp_interval;
4600 params->arp_validate = arp_validate_value;
4601 params->arp_all_targets = arp_all_targets_value;
4602 params->updelay = updelay;
4603 params->downdelay = downdelay;
4604 params->use_carrier = use_carrier;
4605 params->lacp_fast = lacp_fast;
4606 params->primary[0] = 0;
4607 params->primary_reselect = primary_reselect_value;
4608 params->fail_over_mac = fail_over_mac_value;
4609 params->tx_queues = tx_queues;
4610 params->all_slaves_active = all_slaves_active;
4611 params->resend_igmp = resend_igmp;
4612 params->min_links = min_links;
4613 params->lp_interval = lp_interval;
4614 params->packets_per_slave = packets_per_slave;
4615 params->tlb_dynamic_lb = 1; /* Default value */
4616 params->ad_actor_sys_prio = ad_actor_sys_prio;
4617 eth_zero_addr(params->ad_actor_system);
4618 params->ad_user_port_key = ad_user_port_key;
4619 if (packets_per_slave > 0) {
4620 params->reciprocal_packets_per_slave =
4621 reciprocal_value(packets_per_slave);
4622 } else {
4623 /* reciprocal_packets_per_slave is unused if
4624 * packets_per_slave is 0 or 1, just initialize it
4626 params->reciprocal_packets_per_slave =
4627 (struct reciprocal_value) { 0 };
4630 if (primary) {
4631 strncpy(params->primary, primary, IFNAMSIZ);
4632 params->primary[IFNAMSIZ - 1] = 0;
4635 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4637 return 0;
4640 /* Called from registration process */
4641 static int bond_init(struct net_device *bond_dev)
4643 struct bonding *bond = netdev_priv(bond_dev);
4644 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4646 netdev_dbg(bond_dev, "Begin bond_init\n");
4648 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4649 if (!bond->wq)
4650 return -ENOMEM;
4652 netdev_lockdep_set_classes(bond_dev);
4654 list_add_tail(&bond->bond_list, &bn->dev_list);
4656 bond_prepare_sysfs_group(bond);
4658 bond_debug_register(bond);
4660 /* Ensure valid dev_addr */
4661 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4662 bond_dev->addr_assign_type == NET_ADDR_PERM)
4663 eth_hw_addr_random(bond_dev);
4665 return 0;
4668 unsigned int bond_get_num_tx_queues(void)
4670 return tx_queues;
4673 /* Create a new bond based on the specified name and bonding parameters.
4674 * If name is NULL, obtain a suitable "bond%d" name for us.
4675 * Caller must NOT hold rtnl_lock; we need to release it here before we
4676 * set up our sysfs entries.
4678 int bond_create(struct net *net, const char *name)
4680 struct net_device *bond_dev;
4681 struct bonding *bond;
4682 struct alb_bond_info *bond_info;
4683 int res;
4685 rtnl_lock();
4687 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4688 name ? name : "bond%d", NET_NAME_UNKNOWN,
4689 bond_setup, tx_queues);
4690 if (!bond_dev) {
4691 pr_err("%s: eek! can't alloc netdev!\n", name);
4692 rtnl_unlock();
4693 return -ENOMEM;
4697 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4698 * It is set to 0 by default which is wrong.
4700 bond = netdev_priv(bond_dev);
4701 bond_info = &(BOND_ALB_INFO(bond));
4702 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4704 dev_net_set(bond_dev, net);
4705 bond_dev->rtnl_link_ops = &bond_link_ops;
4707 res = register_netdevice(bond_dev);
4709 netif_carrier_off(bond_dev);
4711 rtnl_unlock();
4712 if (res < 0)
4713 bond_destructor(bond_dev);
4714 return res;
4717 static int __net_init bond_net_init(struct net *net)
4719 struct bond_net *bn = net_generic(net, bond_net_id);
4721 bn->net = net;
4722 INIT_LIST_HEAD(&bn->dev_list);
4724 bond_create_proc_dir(bn);
4725 bond_create_sysfs(bn);
4727 return 0;
4730 static void __net_exit bond_net_exit(struct net *net)
4732 struct bond_net *bn = net_generic(net, bond_net_id);
4733 struct bonding *bond, *tmp_bond;
4734 LIST_HEAD(list);
4736 bond_destroy_sysfs(bn);
4738 /* Kill off any bonds created after unregistering bond rtnl ops */
4739 rtnl_lock();
4740 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4741 unregister_netdevice_queue(bond->dev, &list);
4742 unregister_netdevice_many(&list);
4743 rtnl_unlock();
4745 bond_destroy_proc_dir(bn);
4748 static struct pernet_operations bond_net_ops = {
4749 .init = bond_net_init,
4750 .exit = bond_net_exit,
4751 .id = &bond_net_id,
4752 .size = sizeof(struct bond_net),
4755 static int __init bonding_init(void)
4757 int i;
4758 int res;
4760 pr_info("%s", bond_version);
4762 res = bond_check_params(&bonding_defaults);
4763 if (res)
4764 goto out;
4766 res = register_pernet_subsys(&bond_net_ops);
4767 if (res)
4768 goto out;
4770 res = bond_netlink_init();
4771 if (res)
4772 goto err_link;
4774 bond_create_debugfs();
4776 for (i = 0; i < max_bonds; i++) {
4777 res = bond_create(&init_net, NULL);
4778 if (res)
4779 goto err;
4782 register_netdevice_notifier(&bond_netdev_notifier);
4783 out:
4784 return res;
4785 err:
4786 bond_destroy_debugfs();
4787 bond_netlink_fini();
4788 err_link:
4789 unregister_pernet_subsys(&bond_net_ops);
4790 goto out;
4794 static void __exit bonding_exit(void)
4796 unregister_netdevice_notifier(&bond_netdev_notifier);
4798 bond_destroy_debugfs();
4800 bond_netlink_fini();
4801 unregister_pernet_subsys(&bond_net_ops);
4803 #ifdef CONFIG_NET_POLL_CONTROLLER
4804 /* Make sure we don't have an imbalance on our netpoll blocking */
4805 WARN_ON(atomic_read(&netpoll_block_tx));
4806 #endif
4809 module_init(bonding_init);
4810 module_exit(bonding_exit);
4811 MODULE_LICENSE("GPL");
4812 MODULE_VERSION(DRV_VERSION);
4813 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4814 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");