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:
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
14 * and probably many L2 switches ...
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.
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>
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>
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>
64 #include <linux/rtnetlink.h>
65 #include <linux/smp.h>
66 #include <linux/if_ether.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_keys.h>
80 #include <net/switchdev.h>
81 #include <net/bonding.h>
82 #include <net/bond_3ad.h>
83 #include <net/bond_alb.h>
85 /*---------------------------- Module parameters ----------------------------*/
87 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
89 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
90 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
91 static int num_peer_notif = 1;
95 static int use_carrier = 1;
98 static char *primary_reselect;
99 static char *lacp_rate;
100 static int min_links;
101 static char *ad_select;
102 static char *xmit_hash_policy;
103 static int arp_interval;
104 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
105 static char *arp_validate;
106 static char *arp_all_targets;
107 static char *fail_over_mac;
108 static int all_slaves_active;
109 static struct bond_params bonding_defaults;
110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
111 static int packets_per_slave = 1;
112 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
114 module_param(max_bonds, int, 0);
115 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
116 module_param(tx_queues, int, 0);
117 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
118 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
119 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
120 "failover event (alias of num_unsol_na)");
121 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
122 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
123 "failover event (alias of num_grat_arp)");
124 module_param(miimon, int, 0);
125 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
126 module_param(updelay, int, 0);
127 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
128 module_param(downdelay, int, 0);
129 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
131 module_param(use_carrier, int, 0);
132 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
133 "0 for off, 1 for on (default)");
134 module_param(mode, charp, 0);
135 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
136 "1 for active-backup, 2 for balance-xor, "
137 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
138 "6 for balance-alb");
139 module_param(primary, charp, 0);
140 MODULE_PARM_DESC(primary, "Primary network device to use");
141 module_param(primary_reselect, charp, 0);
142 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
144 "0 for always (default), "
145 "1 for only if speed of primary is "
147 "2 for only on active slave "
149 module_param(lacp_rate, charp, 0);
150 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
151 "0 for slow, 1 for fast");
152 module_param(ad_select, charp, 0);
153 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
154 "0 for stable (default), 1 for bandwidth, "
156 module_param(min_links, int, 0);
157 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
159 module_param(xmit_hash_policy, charp, 0);
160 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
161 "0 for layer 2 (default), 1 for layer 3+4, "
162 "2 for layer 2+3, 3 for encap layer 2+3, "
163 "4 for encap layer 3+4");
164 module_param(arp_interval, int, 0);
165 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
166 module_param_array(arp_ip_target, charp, NULL, 0);
167 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
168 module_param(arp_validate, charp, 0);
169 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
170 "0 for none (default), 1 for active, "
171 "2 for backup, 3 for all");
172 module_param(arp_all_targets, charp, 0);
173 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
174 module_param(fail_over_mac, charp, 0);
175 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
176 "the same MAC; 0 for none (default), "
177 "1 for active, 2 for follow");
178 module_param(all_slaves_active, int, 0);
179 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
180 "by setting active flag for all slaves; "
181 "0 for never (default), 1 for always.");
182 module_param(resend_igmp, int, 0);
183 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
185 module_param(packets_per_slave, int, 0);
186 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
187 "mode; 0 for a random slave, 1 packet per "
188 "slave (default), >1 packets per slave.");
189 module_param(lp_interval, uint, 0);
190 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
191 "the bonding driver sends learning packets to "
192 "each slaves peer switch. The default is 1.");
194 /*----------------------------- Global variables ----------------------------*/
196 #ifdef CONFIG_NET_POLL_CONTROLLER
197 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
200 int bond_net_id __read_mostly;
202 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
203 static int arp_ip_count;
204 static int bond_mode = BOND_MODE_ROUNDROBIN;
205 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
206 static int lacp_fast;
208 /*-------------------------- Forward declarations ---------------------------*/
210 static int bond_init(struct net_device *bond_dev);
211 static void bond_uninit(struct net_device *bond_dev);
212 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
213 struct rtnl_link_stats64 *stats);
214 static void bond_slave_arr_handler(struct work_struct *work);
216 /*---------------------------- General routines -----------------------------*/
218 const char *bond_mode_name(int mode)
220 static const char *names[] = {
221 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
222 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
223 [BOND_MODE_XOR] = "load balancing (xor)",
224 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
225 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
226 [BOND_MODE_TLB] = "transmit load balancing",
227 [BOND_MODE_ALB] = "adaptive load balancing",
230 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
236 /*---------------------------------- VLAN -----------------------------------*/
239 * bond_dev_queue_xmit - Prepare skb for xmit.
241 * @bond: bond device that got this skb for tx.
242 * @skb: hw accel VLAN tagged skb to transmit
243 * @slave_dev: slave that is supposed to xmit this skbuff
245 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
246 struct net_device *slave_dev)
248 skb->dev = slave_dev;
250 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
251 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
252 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
254 if (unlikely(netpoll_tx_running(bond->dev)))
255 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
260 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
261 * We don't protect the slave list iteration with a lock because:
262 * a. This operation is performed in IOCTL context,
263 * b. The operation is protected by the RTNL semaphore in the 8021q code,
264 * c. Holding a lock with BH disabled while directly calling a base driver
265 * entry point is generally a BAD idea.
267 * The design of synchronization/protection for this operation in the 8021q
268 * module is good for one or more VLAN devices over a single physical device
269 * and cannot be extended for a teaming solution like bonding, so there is a
270 * potential race condition here where a net device from the vlan group might
271 * be referenced (either by a base driver or the 8021q code) while it is being
272 * removed from the system. However, it turns out we're not making matters
273 * worse, and if it works for regular VLAN usage it will work here too.
277 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
278 * @bond_dev: bonding net device that got called
279 * @vid: vlan id being added
281 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
282 __be16 proto, u16 vid)
284 struct bonding *bond = netdev_priv(bond_dev);
285 struct slave *slave, *rollback_slave;
286 struct list_head *iter;
289 bond_for_each_slave(bond, slave, iter) {
290 res = vlan_vid_add(slave->dev, proto, vid);
298 /* unwind to the slave that failed */
299 bond_for_each_slave(bond, rollback_slave, iter) {
300 if (rollback_slave == slave)
303 vlan_vid_del(rollback_slave->dev, proto, vid);
310 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
311 * @bond_dev: bonding net device that got called
312 * @vid: vlan id being removed
314 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
315 __be16 proto, u16 vid)
317 struct bonding *bond = netdev_priv(bond_dev);
318 struct list_head *iter;
321 bond_for_each_slave(bond, slave, iter)
322 vlan_vid_del(slave->dev, proto, vid);
324 if (bond_is_lb(bond))
325 bond_alb_clear_vlan(bond, vid);
330 /*------------------------------- Link status -------------------------------*/
332 /* Set the carrier state for the master according to the state of its
333 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
334 * do special 802.3ad magic.
336 * Returns zero if carrier state does not change, nonzero if it does.
338 int bond_set_carrier(struct bonding *bond)
340 struct list_head *iter;
343 if (!bond_has_slaves(bond))
346 if (BOND_MODE(bond) == BOND_MODE_8023AD)
347 return bond_3ad_set_carrier(bond);
349 bond_for_each_slave(bond, slave, iter) {
350 if (slave->link == BOND_LINK_UP) {
351 if (!netif_carrier_ok(bond->dev)) {
352 netif_carrier_on(bond->dev);
360 if (netif_carrier_ok(bond->dev)) {
361 netif_carrier_off(bond->dev);
367 /* Get link speed and duplex from the slave's base driver
368 * using ethtool. If for some reason the call fails or the
369 * values are invalid, set speed and duplex to -1,
372 static void bond_update_speed_duplex(struct slave *slave)
374 struct net_device *slave_dev = slave->dev;
375 struct ethtool_cmd ecmd;
379 slave->speed = SPEED_UNKNOWN;
380 slave->duplex = DUPLEX_UNKNOWN;
382 res = __ethtool_get_settings(slave_dev, &ecmd);
386 slave_speed = ethtool_cmd_speed(&ecmd);
387 if (slave_speed == 0 || slave_speed == ((__u32) -1))
390 switch (ecmd.duplex) {
398 slave->speed = slave_speed;
399 slave->duplex = ecmd.duplex;
404 const char *bond_slave_link_status(s8 link)
420 /* if <dev> supports MII link status reporting, check its link status.
422 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
423 * depending upon the setting of the use_carrier parameter.
425 * Return either BMSR_LSTATUS, meaning that the link is up (or we
426 * can't tell and just pretend it is), or 0, meaning that the link is
429 * If reporting is non-zero, instead of faking link up, return -1 if
430 * both ETHTOOL and MII ioctls fail (meaning the device does not
431 * support them). If use_carrier is set, return whatever it says.
432 * It'd be nice if there was a good way to tell if a driver supports
433 * netif_carrier, but there really isn't.
435 static int bond_check_dev_link(struct bonding *bond,
436 struct net_device *slave_dev, int reporting)
438 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
439 int (*ioctl)(struct net_device *, struct ifreq *, int);
441 struct mii_ioctl_data *mii;
443 if (!reporting && !netif_running(slave_dev))
446 if (bond->params.use_carrier)
447 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
449 /* Try to get link status using Ethtool first. */
450 if (slave_dev->ethtool_ops->get_link)
451 return slave_dev->ethtool_ops->get_link(slave_dev) ?
454 /* Ethtool can't be used, fallback to MII ioctls. */
455 ioctl = slave_ops->ndo_do_ioctl;
457 /* TODO: set pointer to correct ioctl on a per team member
458 * bases to make this more efficient. that is, once
459 * we determine the correct ioctl, we will always
460 * call it and not the others for that team
464 /* We cannot assume that SIOCGMIIPHY will also read a
465 * register; not all network drivers (e.g., e100)
469 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
470 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
472 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
473 mii->reg_num = MII_BMSR;
474 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
475 return mii->val_out & BMSR_LSTATUS;
479 /* If reporting, report that either there's no dev->do_ioctl,
480 * or both SIOCGMIIREG and get_link failed (meaning that we
481 * cannot report link status). If not reporting, pretend
484 return reporting ? -1 : BMSR_LSTATUS;
487 /*----------------------------- Multicast list ------------------------------*/
489 /* Push the promiscuity flag down to appropriate slaves */
490 static int bond_set_promiscuity(struct bonding *bond, int inc)
492 struct list_head *iter;
495 if (bond_uses_primary(bond)) {
496 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
499 err = dev_set_promiscuity(curr_active->dev, inc);
503 bond_for_each_slave(bond, slave, iter) {
504 err = dev_set_promiscuity(slave->dev, inc);
512 /* Push the allmulti flag down to all slaves */
513 static int bond_set_allmulti(struct bonding *bond, int inc)
515 struct list_head *iter;
518 if (bond_uses_primary(bond)) {
519 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
522 err = dev_set_allmulti(curr_active->dev, inc);
526 bond_for_each_slave(bond, slave, iter) {
527 err = dev_set_allmulti(slave->dev, inc);
535 /* Retrieve the list of registered multicast addresses for the bonding
536 * device and retransmit an IGMP JOIN request to the current active
539 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
541 struct bonding *bond = container_of(work, struct bonding,
544 if (!rtnl_trylock()) {
545 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
548 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
550 if (bond->igmp_retrans > 1) {
551 bond->igmp_retrans--;
552 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
557 /* Flush bond's hardware addresses from slave */
558 static void bond_hw_addr_flush(struct net_device *bond_dev,
559 struct net_device *slave_dev)
561 struct bonding *bond = netdev_priv(bond_dev);
563 dev_uc_unsync(slave_dev, bond_dev);
564 dev_mc_unsync(slave_dev, bond_dev);
566 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
567 /* del lacpdu mc addr from mc list */
568 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
570 dev_mc_del(slave_dev, lacpdu_multicast);
574 /*--------------------------- Active slave change ---------------------------*/
576 /* Update the hardware address list and promisc/allmulti for the new and
577 * old active slaves (if any). Modes that are not using primary keep all
578 * slaves up date at all times; only the modes that use primary need to call
579 * this function to swap these settings during a failover.
581 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
582 struct slave *old_active)
585 if (bond->dev->flags & IFF_PROMISC)
586 dev_set_promiscuity(old_active->dev, -1);
588 if (bond->dev->flags & IFF_ALLMULTI)
589 dev_set_allmulti(old_active->dev, -1);
591 bond_hw_addr_flush(bond->dev, old_active->dev);
595 /* FIXME: Signal errors upstream. */
596 if (bond->dev->flags & IFF_PROMISC)
597 dev_set_promiscuity(new_active->dev, 1);
599 if (bond->dev->flags & IFF_ALLMULTI)
600 dev_set_allmulti(new_active->dev, 1);
602 netif_addr_lock_bh(bond->dev);
603 dev_uc_sync(new_active->dev, bond->dev);
604 dev_mc_sync(new_active->dev, bond->dev);
605 netif_addr_unlock_bh(bond->dev);
610 * bond_set_dev_addr - clone slave's address to bond
611 * @bond_dev: bond net device
612 * @slave_dev: slave net device
614 * Should be called with RTNL held.
616 static void bond_set_dev_addr(struct net_device *bond_dev,
617 struct net_device *slave_dev)
619 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
620 bond_dev, slave_dev, slave_dev->addr_len);
621 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
622 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
623 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
626 /* bond_do_fail_over_mac
628 * Perform special MAC address swapping for fail_over_mac settings
632 static void bond_do_fail_over_mac(struct bonding *bond,
633 struct slave *new_active,
634 struct slave *old_active)
636 u8 tmp_mac[ETH_ALEN];
637 struct sockaddr saddr;
640 switch (bond->params.fail_over_mac) {
641 case BOND_FOM_ACTIVE:
643 bond_set_dev_addr(bond->dev, new_active->dev);
645 case BOND_FOM_FOLLOW:
646 /* if new_active && old_active, swap them
647 * if just old_active, do nothing (going to no active slave)
648 * if just new_active, set new_active to bond's MAC
654 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
655 ether_addr_copy(saddr.sa_data,
656 old_active->dev->dev_addr);
657 saddr.sa_family = new_active->dev->type;
659 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
660 saddr.sa_family = bond->dev->type;
663 rv = dev_set_mac_address(new_active->dev, &saddr);
665 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
666 -rv, new_active->dev->name);
673 ether_addr_copy(saddr.sa_data, tmp_mac);
674 saddr.sa_family = old_active->dev->type;
676 rv = dev_set_mac_address(old_active->dev, &saddr);
678 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
679 -rv, new_active->dev->name);
683 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
684 bond->params.fail_over_mac);
690 static bool bond_should_change_active(struct bonding *bond)
692 struct slave *prim = rtnl_dereference(bond->primary_slave);
693 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
695 if (!prim || !curr || curr->link != BOND_LINK_UP)
697 if (bond->force_primary) {
698 bond->force_primary = false;
701 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
702 (prim->speed < curr->speed ||
703 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
705 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
711 * find_best_interface - select the best available slave to be the active one
712 * @bond: our bonding struct
714 static struct slave *bond_find_best_slave(struct bonding *bond)
716 struct slave *slave, *bestslave = NULL, *primary;
717 struct list_head *iter;
718 int mintime = bond->params.updelay;
720 primary = rtnl_dereference(bond->primary_slave);
721 if (primary && primary->link == BOND_LINK_UP &&
722 bond_should_change_active(bond))
725 bond_for_each_slave(bond, slave, iter) {
726 if (slave->link == BOND_LINK_UP)
728 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
729 slave->delay < mintime) {
730 mintime = slave->delay;
738 static bool bond_should_notify_peers(struct bonding *bond)
743 slave = rcu_dereference(bond->curr_active_slave);
746 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
747 slave ? slave->dev->name : "NULL");
749 if (!slave || !bond->send_peer_notif ||
750 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
757 * change_active_interface - change the active slave into the specified one
758 * @bond: our bonding struct
759 * @new: the new slave to make the active one
761 * Set the new slave to the bond's settings and unset them on the old
763 * Setting include flags, mc-list, promiscuity, allmulti, etc.
765 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
766 * because it is apparently the best available slave we have, even though its
767 * updelay hasn't timed out yet.
769 * Caller must hold RTNL.
771 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
773 struct slave *old_active;
777 old_active = rtnl_dereference(bond->curr_active_slave);
779 if (old_active == new_active)
783 new_active->last_link_up = jiffies;
785 if (new_active->link == BOND_LINK_BACK) {
786 if (bond_uses_primary(bond)) {
787 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
788 new_active->dev->name,
789 (bond->params.updelay - new_active->delay) * bond->params.miimon);
792 new_active->delay = 0;
793 bond_set_slave_link_state(new_active, BOND_LINK_UP);
795 if (BOND_MODE(bond) == BOND_MODE_8023AD)
796 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
798 if (bond_is_lb(bond))
799 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
801 if (bond_uses_primary(bond)) {
802 netdev_info(bond->dev, "making interface %s the new active one\n",
803 new_active->dev->name);
808 if (bond_uses_primary(bond))
809 bond_hw_addr_swap(bond, new_active, old_active);
811 if (bond_is_lb(bond)) {
812 bond_alb_handle_active_change(bond, new_active);
814 bond_set_slave_inactive_flags(old_active,
815 BOND_SLAVE_NOTIFY_NOW);
817 bond_set_slave_active_flags(new_active,
818 BOND_SLAVE_NOTIFY_NOW);
820 rcu_assign_pointer(bond->curr_active_slave, new_active);
823 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
825 bond_set_slave_inactive_flags(old_active,
826 BOND_SLAVE_NOTIFY_NOW);
829 bool should_notify_peers = false;
831 bond_set_slave_active_flags(new_active,
832 BOND_SLAVE_NOTIFY_NOW);
834 if (bond->params.fail_over_mac)
835 bond_do_fail_over_mac(bond, new_active,
838 if (netif_running(bond->dev)) {
839 bond->send_peer_notif =
840 bond->params.num_peer_notif;
841 should_notify_peers =
842 bond_should_notify_peers(bond);
845 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
846 if (should_notify_peers)
847 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
852 /* resend IGMP joins since active slave has changed or
853 * all were sent on curr_active_slave.
854 * resend only if bond is brought up with the affected
855 * bonding modes and the retransmission is enabled
857 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
858 ((bond_uses_primary(bond) && new_active) ||
859 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
860 bond->igmp_retrans = bond->params.resend_igmp;
861 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
866 * bond_select_active_slave - select a new active slave, if needed
867 * @bond: our bonding struct
869 * This functions should be called when one of the following occurs:
870 * - The old curr_active_slave has been released or lost its link.
871 * - The primary_slave has got its link back.
872 * - A slave has got its link back and there's no old curr_active_slave.
874 * Caller must hold RTNL.
876 void bond_select_active_slave(struct bonding *bond)
878 struct slave *best_slave;
883 best_slave = bond_find_best_slave(bond);
884 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
885 bond_change_active_slave(bond, best_slave);
886 rv = bond_set_carrier(bond);
890 if (netif_carrier_ok(bond->dev)) {
891 netdev_info(bond->dev, "first active interface up!\n");
893 netdev_info(bond->dev, "now running without any active interface!\n");
898 #ifdef CONFIG_NET_POLL_CONTROLLER
899 static inline int slave_enable_netpoll(struct slave *slave)
904 np = kzalloc(sizeof(*np), GFP_KERNEL);
909 err = __netpoll_setup(np, slave->dev);
918 static inline void slave_disable_netpoll(struct slave *slave)
920 struct netpoll *np = slave->np;
926 __netpoll_free_async(np);
929 static void bond_poll_controller(struct net_device *bond_dev)
931 struct bonding *bond = netdev_priv(bond_dev);
932 struct slave *slave = NULL;
933 struct list_head *iter;
934 struct ad_info ad_info;
935 struct netpoll_info *ni;
936 const struct net_device_ops *ops;
938 if (BOND_MODE(bond) == BOND_MODE_8023AD)
939 if (bond_3ad_get_active_agg_info(bond, &ad_info))
943 bond_for_each_slave_rcu(bond, slave, iter) {
944 ops = slave->dev->netdev_ops;
945 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
948 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
949 struct aggregator *agg =
950 SLAVE_AD_INFO(slave)->port.aggregator;
953 agg->aggregator_identifier != ad_info.aggregator_id)
957 ni = rcu_dereference_bh(slave->dev->npinfo);
958 if (down_trylock(&ni->dev_lock))
960 ops->ndo_poll_controller(slave->dev);
963 rcu_read_unlock_bh();
966 static void bond_netpoll_cleanup(struct net_device *bond_dev)
968 struct bonding *bond = netdev_priv(bond_dev);
969 struct list_head *iter;
972 bond_for_each_slave(bond, slave, iter)
973 if (bond_slave_is_up(slave))
974 slave_disable_netpoll(slave);
977 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
979 struct bonding *bond = netdev_priv(dev);
980 struct list_head *iter;
984 bond_for_each_slave(bond, slave, iter) {
985 err = slave_enable_netpoll(slave);
987 bond_netpoll_cleanup(dev);
994 static inline int slave_enable_netpoll(struct slave *slave)
998 static inline void slave_disable_netpoll(struct slave *slave)
1001 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1006 /*---------------------------------- IOCTL ----------------------------------*/
1008 static netdev_features_t bond_fix_features(struct net_device *dev,
1009 netdev_features_t features)
1011 struct bonding *bond = netdev_priv(dev);
1012 struct list_head *iter;
1013 netdev_features_t mask;
1014 struct slave *slave;
1016 /* If any slave has the offload feature flag set,
1017 * set the offload flag on the bond.
1019 mask = features | NETIF_F_HW_SWITCH_OFFLOAD;
1021 features &= ~NETIF_F_ONE_FOR_ALL;
1022 features |= NETIF_F_ALL_FOR_ALL;
1024 bond_for_each_slave(bond, slave, iter) {
1025 features = netdev_increment_features(features,
1026 slave->dev->features,
1029 features = netdev_add_tso_features(features, mask);
1034 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1035 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1036 NETIF_F_HIGHDMA | NETIF_F_LRO)
1038 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1041 static void bond_compute_features(struct bonding *bond)
1043 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1044 IFF_XMIT_DST_RELEASE_PERM;
1045 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1046 netdev_features_t enc_features = BOND_ENC_FEATURES;
1047 struct net_device *bond_dev = bond->dev;
1048 struct list_head *iter;
1049 struct slave *slave;
1050 unsigned short max_hard_header_len = ETH_HLEN;
1051 unsigned int gso_max_size = GSO_MAX_SIZE;
1052 u16 gso_max_segs = GSO_MAX_SEGS;
1054 if (!bond_has_slaves(bond))
1056 vlan_features &= NETIF_F_ALL_FOR_ALL;
1058 bond_for_each_slave(bond, slave, iter) {
1059 vlan_features = netdev_increment_features(vlan_features,
1060 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1062 enc_features = netdev_increment_features(enc_features,
1063 slave->dev->hw_enc_features,
1065 dst_release_flag &= slave->dev->priv_flags;
1066 if (slave->dev->hard_header_len > max_hard_header_len)
1067 max_hard_header_len = slave->dev->hard_header_len;
1069 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1070 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1074 bond_dev->vlan_features = vlan_features;
1075 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1076 bond_dev->hard_header_len = max_hard_header_len;
1077 bond_dev->gso_max_segs = gso_max_segs;
1078 netif_set_gso_max_size(bond_dev, gso_max_size);
1080 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1081 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1082 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1083 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1085 netdev_change_features(bond_dev);
1088 static void bond_setup_by_slave(struct net_device *bond_dev,
1089 struct net_device *slave_dev)
1091 bond_dev->header_ops = slave_dev->header_ops;
1093 bond_dev->type = slave_dev->type;
1094 bond_dev->hard_header_len = slave_dev->hard_header_len;
1095 bond_dev->addr_len = slave_dev->addr_len;
1097 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1098 slave_dev->addr_len);
1101 /* On bonding slaves other than the currently active slave, suppress
1102 * duplicates except for alb non-mcast/bcast.
1104 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1105 struct slave *slave,
1106 struct bonding *bond)
1108 if (bond_is_slave_inactive(slave)) {
1109 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1110 skb->pkt_type != PACKET_BROADCAST &&
1111 skb->pkt_type != PACKET_MULTICAST)
1118 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1120 struct sk_buff *skb = *pskb;
1121 struct slave *slave;
1122 struct bonding *bond;
1123 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1125 int ret = RX_HANDLER_ANOTHER;
1127 skb = skb_share_check(skb, GFP_ATOMIC);
1129 return RX_HANDLER_CONSUMED;
1133 slave = bond_slave_get_rcu(skb->dev);
1136 recv_probe = ACCESS_ONCE(bond->recv_probe);
1138 ret = recv_probe(skb, bond, slave);
1139 if (ret == RX_HANDLER_CONSUMED) {
1145 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1146 return RX_HANDLER_EXACT;
1149 skb->dev = bond->dev;
1151 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1152 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1153 skb->pkt_type == PACKET_HOST) {
1155 if (unlikely(skb_cow_head(skb,
1156 skb->data - skb_mac_header(skb)))) {
1158 return RX_HANDLER_CONSUMED;
1160 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1166 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1167 struct net_device *slave_dev,
1168 struct slave *slave)
1172 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1175 slave_dev->flags |= IFF_SLAVE;
1176 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1180 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1181 struct net_device *slave_dev)
1183 netdev_upper_dev_unlink(slave_dev, bond_dev);
1184 slave_dev->flags &= ~IFF_SLAVE;
1185 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1188 static struct slave *bond_alloc_slave(struct bonding *bond)
1190 struct slave *slave = NULL;
1192 slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1196 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1197 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1199 if (!SLAVE_AD_INFO(slave)) {
1207 static void bond_free_slave(struct slave *slave)
1209 struct bonding *bond = bond_get_bond_by_slave(slave);
1211 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1212 kfree(SLAVE_AD_INFO(slave));
1217 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1219 info->bond_mode = BOND_MODE(bond);
1220 info->miimon = bond->params.miimon;
1221 info->num_slaves = bond->slave_cnt;
1224 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1226 strcpy(info->slave_name, slave->dev->name);
1227 info->link = slave->link;
1228 info->state = bond_slave_state(slave);
1229 info->link_failure_count = slave->link_failure_count;
1232 static void bond_netdev_notify(struct net_device *dev,
1233 struct netdev_bonding_info *info)
1236 netdev_bonding_info_change(dev, info);
1240 static void bond_netdev_notify_work(struct work_struct *_work)
1242 struct netdev_notify_work *w =
1243 container_of(_work, struct netdev_notify_work, work.work);
1245 bond_netdev_notify(w->dev, &w->bonding_info);
1250 void bond_queue_slave_event(struct slave *slave)
1252 struct bonding *bond = slave->bond;
1253 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1258 dev_hold(slave->dev);
1259 nnw->dev = slave->dev;
1260 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1261 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1262 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1264 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1267 /* enslave device <slave> to bond device <master> */
1268 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1270 struct bonding *bond = netdev_priv(bond_dev);
1271 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1272 struct slave *new_slave = NULL, *prev_slave;
1273 struct sockaddr addr;
1277 if (!bond->params.use_carrier &&
1278 slave_dev->ethtool_ops->get_link == NULL &&
1279 slave_ops->ndo_do_ioctl == NULL) {
1280 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1284 /* already enslaved */
1285 if (slave_dev->flags & IFF_SLAVE) {
1286 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1290 if (bond_dev == slave_dev) {
1291 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1295 /* vlan challenged mutual exclusion */
1296 /* no need to lock since we're protected by rtnl_lock */
1297 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1298 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1300 if (vlan_uses_dev(bond_dev)) {
1301 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1302 slave_dev->name, bond_dev->name);
1305 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1306 slave_dev->name, slave_dev->name,
1310 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1314 /* Old ifenslave binaries are no longer supported. These can
1315 * be identified with moderate accuracy by the state of the slave:
1316 * the current ifenslave will set the interface down prior to
1317 * enslaving it; the old ifenslave will not.
1319 if ((slave_dev->flags & IFF_UP)) {
1320 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1323 goto err_undo_flags;
1326 /* set bonding device ether type by slave - bonding netdevices are
1327 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1328 * there is a need to override some of the type dependent attribs/funcs.
1330 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1331 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1333 if (!bond_has_slaves(bond)) {
1334 if (bond_dev->type != slave_dev->type) {
1335 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1336 bond_dev->type, slave_dev->type);
1338 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1340 res = notifier_to_errno(res);
1342 netdev_err(bond_dev, "refused to change device type\n");
1344 goto err_undo_flags;
1347 /* Flush unicast and multicast addresses */
1348 dev_uc_flush(bond_dev);
1349 dev_mc_flush(bond_dev);
1351 if (slave_dev->type != ARPHRD_ETHER)
1352 bond_setup_by_slave(bond_dev, slave_dev);
1354 ether_setup(bond_dev);
1355 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1358 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1361 } else if (bond_dev->type != slave_dev->type) {
1362 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1363 slave_dev->name, slave_dev->type, bond_dev->type);
1365 goto err_undo_flags;
1368 if (slave_ops->ndo_set_mac_address == NULL) {
1369 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1370 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1371 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1372 if (!bond_has_slaves(bond)) {
1373 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1374 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1376 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");
1378 goto err_undo_flags;
1383 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1385 /* If this is the first slave, then we need to set the master's hardware
1386 * address to be the same as the slave's.
1388 if (!bond_has_slaves(bond) &&
1389 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1390 bond_set_dev_addr(bond->dev, slave_dev);
1392 new_slave = bond_alloc_slave(bond);
1395 goto err_undo_flags;
1398 new_slave->bond = bond;
1399 new_slave->dev = slave_dev;
1400 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1401 * is set via sysfs or module option if desired.
1403 new_slave->queue_id = 0;
1405 /* Save slave's original mtu and then set it to match the bond */
1406 new_slave->original_mtu = slave_dev->mtu;
1407 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1409 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1413 /* Save slave's original ("permanent") mac address for modes
1414 * that need it, and for restoring it upon release, and then
1415 * set it to the master's address
1417 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1419 if (!bond->params.fail_over_mac ||
1420 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1421 /* Set slave to master's mac address. The application already
1422 * set the master's mac address to that of the first slave
1424 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1425 addr.sa_family = slave_dev->type;
1426 res = dev_set_mac_address(slave_dev, &addr);
1428 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1429 goto err_restore_mtu;
1433 /* open the slave since the application closed it */
1434 res = dev_open(slave_dev);
1436 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1437 goto err_restore_mac;
1440 slave_dev->priv_flags |= IFF_BONDING;
1441 /* initialize slave stats */
1442 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1444 if (bond_is_lb(bond)) {
1445 /* bond_alb_init_slave() must be called before all other stages since
1446 * it might fail and we do not want to have to undo everything
1448 res = bond_alb_init_slave(bond, new_slave);
1453 /* If the mode uses primary, then the following is handled by
1454 * bond_change_active_slave().
1456 if (!bond_uses_primary(bond)) {
1457 /* set promiscuity level to new slave */
1458 if (bond_dev->flags & IFF_PROMISC) {
1459 res = dev_set_promiscuity(slave_dev, 1);
1464 /* set allmulti level to new slave */
1465 if (bond_dev->flags & IFF_ALLMULTI) {
1466 res = dev_set_allmulti(slave_dev, 1);
1471 netif_addr_lock_bh(bond_dev);
1473 dev_mc_sync_multiple(slave_dev, bond_dev);
1474 dev_uc_sync_multiple(slave_dev, bond_dev);
1476 netif_addr_unlock_bh(bond_dev);
1479 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1480 /* add lacpdu mc addr to mc list */
1481 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1483 dev_mc_add(slave_dev, lacpdu_multicast);
1486 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1488 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1493 prev_slave = bond_last_slave(bond);
1495 new_slave->delay = 0;
1496 new_slave->link_failure_count = 0;
1498 bond_update_speed_duplex(new_slave);
1500 new_slave->last_rx = jiffies -
1501 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1502 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1503 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1505 if (bond->params.miimon && !bond->params.use_carrier) {
1506 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1508 if ((link_reporting == -1) && !bond->params.arp_interval) {
1509 /* miimon is set but a bonded network driver
1510 * does not support ETHTOOL/MII and
1511 * arp_interval is not set. Note: if
1512 * use_carrier is enabled, we will never go
1513 * here (because netif_carrier is always
1514 * supported); thus, we don't need to change
1515 * the messages for netif_carrier.
1517 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",
1519 } else if (link_reporting == -1) {
1520 /* unable get link status using mii/ethtool */
1521 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",
1526 /* check for initial state */
1527 if (bond->params.miimon) {
1528 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1529 if (bond->params.updelay) {
1530 bond_set_slave_link_state(new_slave,
1532 new_slave->delay = bond->params.updelay;
1534 bond_set_slave_link_state(new_slave,
1538 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1540 } else if (bond->params.arp_interval) {
1541 bond_set_slave_link_state(new_slave,
1542 (netif_carrier_ok(slave_dev) ?
1543 BOND_LINK_UP : BOND_LINK_DOWN));
1545 bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1548 if (new_slave->link != BOND_LINK_DOWN)
1549 new_slave->last_link_up = jiffies;
1550 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1551 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1552 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1554 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1555 /* if there is a primary slave, remember it */
1556 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1557 rcu_assign_pointer(bond->primary_slave, new_slave);
1558 bond->force_primary = true;
1562 switch (BOND_MODE(bond)) {
1563 case BOND_MODE_ACTIVEBACKUP:
1564 bond_set_slave_inactive_flags(new_slave,
1565 BOND_SLAVE_NOTIFY_NOW);
1567 case BOND_MODE_8023AD:
1568 /* in 802.3ad mode, the internal mechanism
1569 * will activate the slaves in the selected
1572 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1573 /* if this is the first slave */
1575 SLAVE_AD_INFO(new_slave)->id = 1;
1576 /* Initialize AD with the number of times that the AD timer is called in 1 second
1577 * can be called only after the mac address of the bond is set
1579 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1581 SLAVE_AD_INFO(new_slave)->id =
1582 SLAVE_AD_INFO(prev_slave)->id + 1;
1585 bond_3ad_bind_slave(new_slave);
1589 bond_set_active_slave(new_slave);
1590 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1593 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1595 /* always active in trunk mode */
1596 bond_set_active_slave(new_slave);
1598 /* In trunking mode there is little meaning to curr_active_slave
1599 * anyway (it holds no special properties of the bond device),
1600 * so we can change it without calling change_active_interface()
1602 if (!rcu_access_pointer(bond->curr_active_slave) &&
1603 new_slave->link == BOND_LINK_UP)
1604 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1607 } /* switch(bond_mode) */
1609 #ifdef CONFIG_NET_POLL_CONTROLLER
1610 slave_dev->npinfo = bond->dev->npinfo;
1611 if (slave_dev->npinfo) {
1612 if (slave_enable_netpoll(new_slave)) {
1613 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1620 if (!(bond_dev->features & NETIF_F_LRO))
1621 dev_disable_lro(slave_dev);
1623 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1626 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1630 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1632 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1633 goto err_unregister;
1636 res = bond_sysfs_slave_add(new_slave);
1638 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1639 goto err_upper_unlink;
1643 bond_compute_features(bond);
1644 bond_set_carrier(bond);
1646 if (bond_uses_primary(bond)) {
1648 bond_select_active_slave(bond);
1649 unblock_netpoll_tx();
1652 if (bond_mode_uses_xmit_hash(bond))
1653 bond_update_slave_arr(bond, NULL);
1655 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1657 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1658 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1660 /* enslave is successful */
1661 bond_queue_slave_event(new_slave);
1664 /* Undo stages on error */
1666 bond_upper_dev_unlink(bond_dev, slave_dev);
1669 netdev_rx_handler_unregister(slave_dev);
1672 if (!bond_uses_primary(bond))
1673 bond_hw_addr_flush(bond_dev, slave_dev);
1675 vlan_vids_del_by_dev(slave_dev, bond_dev);
1676 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1677 RCU_INIT_POINTER(bond->primary_slave, NULL);
1678 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1680 bond_change_active_slave(bond, NULL);
1681 bond_select_active_slave(bond);
1682 unblock_netpoll_tx();
1684 /* either primary_slave or curr_active_slave might've changed */
1686 slave_disable_netpoll(new_slave);
1689 slave_dev->priv_flags &= ~IFF_BONDING;
1690 dev_close(slave_dev);
1693 if (!bond->params.fail_over_mac ||
1694 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1695 /* XXX TODO - fom follow mode needs to change master's
1696 * MAC if this slave's MAC is in use by the bond, or at
1697 * least print a warning.
1699 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1700 addr.sa_family = slave_dev->type;
1701 dev_set_mac_address(slave_dev, &addr);
1705 dev_set_mtu(slave_dev, new_slave->original_mtu);
1708 bond_free_slave(new_slave);
1711 /* Enslave of first slave has failed and we need to fix master's mac */
1712 if (!bond_has_slaves(bond) &&
1713 ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1714 eth_hw_addr_random(bond_dev);
1719 /* Try to release the slave device <slave> from the bond device <master>
1720 * It is legal to access curr_active_slave without a lock because all the function
1721 * is RTNL-locked. If "all" is true it means that the function is being called
1722 * while destroying a bond interface and all slaves are being released.
1724 * The rules for slave state should be:
1725 * for Active/Backup:
1726 * Active stays on all backups go down
1727 * for Bonded connections:
1728 * The first up interface should be left on and all others downed.
1730 static int __bond_release_one(struct net_device *bond_dev,
1731 struct net_device *slave_dev,
1734 struct bonding *bond = netdev_priv(bond_dev);
1735 struct slave *slave, *oldcurrent;
1736 struct sockaddr addr;
1737 int old_flags = bond_dev->flags;
1738 netdev_features_t old_features = bond_dev->features;
1740 /* slave is not a slave or master is not master of this slave */
1741 if (!(slave_dev->flags & IFF_SLAVE) ||
1742 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1743 netdev_dbg(bond_dev, "cannot release %s\n",
1750 slave = bond_get_slave_by_dev(bond, slave_dev);
1752 /* not a slave of this bond */
1753 netdev_info(bond_dev, "%s not enslaved\n",
1755 unblock_netpoll_tx();
1759 bond_sysfs_slave_del(slave);
1761 /* recompute stats just before removing the slave */
1762 bond_get_stats(bond->dev, &bond->bond_stats);
1764 bond_upper_dev_unlink(bond_dev, slave_dev);
1765 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1766 * for this slave anymore.
1768 netdev_rx_handler_unregister(slave_dev);
1770 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1771 bond_3ad_unbind_slave(slave);
1773 if (bond_mode_uses_xmit_hash(bond))
1774 bond_update_slave_arr(bond, slave);
1776 netdev_info(bond_dev, "Releasing %s interface %s\n",
1777 bond_is_active_slave(slave) ? "active" : "backup",
1780 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1782 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1784 if (!all && (!bond->params.fail_over_mac ||
1785 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1786 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1787 bond_has_slaves(bond))
1788 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",
1789 slave_dev->name, slave->perm_hwaddr,
1790 bond_dev->name, slave_dev->name);
1793 if (rtnl_dereference(bond->primary_slave) == slave)
1794 RCU_INIT_POINTER(bond->primary_slave, NULL);
1796 if (oldcurrent == slave)
1797 bond_change_active_slave(bond, NULL);
1799 if (bond_is_lb(bond)) {
1800 /* Must be called only after the slave has been
1801 * detached from the list and the curr_active_slave
1802 * has been cleared (if our_slave == old_current),
1803 * but before a new active slave is selected.
1805 bond_alb_deinit_slave(bond, slave);
1809 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1810 } else if (oldcurrent == slave) {
1811 /* Note that we hold RTNL over this sequence, so there
1812 * is no concern that another slave add/remove event
1815 bond_select_active_slave(bond);
1818 if (!bond_has_slaves(bond)) {
1819 bond_set_carrier(bond);
1820 eth_hw_addr_random(bond_dev);
1823 unblock_netpoll_tx();
1827 if (!bond_has_slaves(bond)) {
1828 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1829 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1832 bond_compute_features(bond);
1833 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1834 (old_features & NETIF_F_VLAN_CHALLENGED))
1835 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1836 slave_dev->name, bond_dev->name);
1838 vlan_vids_del_by_dev(slave_dev, bond_dev);
1840 /* If the mode uses primary, then this case was handled above by
1841 * bond_change_active_slave(..., NULL)
1843 if (!bond_uses_primary(bond)) {
1844 /* unset promiscuity level from slave
1845 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1846 * of the IFF_PROMISC flag in the bond_dev, but we need the
1847 * value of that flag before that change, as that was the value
1848 * when this slave was attached, so we cache at the start of the
1849 * function and use it here. Same goes for ALLMULTI below
1851 if (old_flags & IFF_PROMISC)
1852 dev_set_promiscuity(slave_dev, -1);
1854 /* unset allmulti level from slave */
1855 if (old_flags & IFF_ALLMULTI)
1856 dev_set_allmulti(slave_dev, -1);
1858 bond_hw_addr_flush(bond_dev, slave_dev);
1861 slave_disable_netpoll(slave);
1863 /* close slave before restoring its mac address */
1864 dev_close(slave_dev);
1866 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1867 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1868 /* restore original ("permanent") mac address */
1869 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1870 addr.sa_family = slave_dev->type;
1871 dev_set_mac_address(slave_dev, &addr);
1874 dev_set_mtu(slave_dev, slave->original_mtu);
1876 slave_dev->priv_flags &= ~IFF_BONDING;
1878 bond_free_slave(slave);
1883 /* A wrapper used because of ndo_del_link */
1884 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1886 return __bond_release_one(bond_dev, slave_dev, false);
1889 /* First release a slave and then destroy the bond if no more slaves are left.
1890 * Must be under rtnl_lock when this function is called.
1892 static int bond_release_and_destroy(struct net_device *bond_dev,
1893 struct net_device *slave_dev)
1895 struct bonding *bond = netdev_priv(bond_dev);
1898 ret = bond_release(bond_dev, slave_dev);
1899 if (ret == 0 && !bond_has_slaves(bond)) {
1900 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1901 netdev_info(bond_dev, "Destroying bond %s\n",
1903 unregister_netdevice(bond_dev);
1908 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1910 struct bonding *bond = netdev_priv(bond_dev);
1911 bond_fill_ifbond(bond, info);
1915 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1917 struct bonding *bond = netdev_priv(bond_dev);
1918 struct list_head *iter;
1919 int i = 0, res = -ENODEV;
1920 struct slave *slave;
1922 bond_for_each_slave(bond, slave, iter) {
1923 if (i++ == (int)info->slave_id) {
1925 bond_fill_ifslave(slave, info);
1933 /*-------------------------------- Monitoring -------------------------------*/
1935 /* called with rcu_read_lock() */
1936 static int bond_miimon_inspect(struct bonding *bond)
1938 int link_state, commit = 0;
1939 struct list_head *iter;
1940 struct slave *slave;
1941 bool ignore_updelay;
1943 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1945 bond_for_each_slave_rcu(bond, slave, iter) {
1946 slave->new_link = BOND_LINK_NOCHANGE;
1948 link_state = bond_check_dev_link(bond, slave->dev, 0);
1950 switch (slave->link) {
1955 bond_set_slave_link_state(slave, BOND_LINK_FAIL);
1956 slave->delay = bond->params.downdelay;
1958 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1960 BOND_MODE_ACTIVEBACKUP) ?
1961 (bond_is_active_slave(slave) ?
1962 "active " : "backup ") : "",
1964 bond->params.downdelay * bond->params.miimon);
1967 case BOND_LINK_FAIL:
1969 /* recovered before downdelay expired */
1970 bond_set_slave_link_state(slave, BOND_LINK_UP);
1971 slave->last_link_up = jiffies;
1972 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1973 (bond->params.downdelay - slave->delay) *
1974 bond->params.miimon,
1979 if (slave->delay <= 0) {
1980 slave->new_link = BOND_LINK_DOWN;
1988 case BOND_LINK_DOWN:
1992 bond_set_slave_link_state(slave, BOND_LINK_BACK);
1993 slave->delay = bond->params.updelay;
1996 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1998 ignore_updelay ? 0 :
1999 bond->params.updelay *
2000 bond->params.miimon);
2003 case BOND_LINK_BACK:
2005 bond_set_slave_link_state(slave,
2007 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2008 (bond->params.updelay - slave->delay) *
2009 bond->params.miimon,
2018 if (slave->delay <= 0) {
2019 slave->new_link = BOND_LINK_UP;
2021 ignore_updelay = false;
2033 static void bond_miimon_commit(struct bonding *bond)
2035 struct list_head *iter;
2036 struct slave *slave, *primary;
2038 bond_for_each_slave(bond, slave, iter) {
2039 switch (slave->new_link) {
2040 case BOND_LINK_NOCHANGE:
2044 bond_set_slave_link_state(slave, BOND_LINK_UP);
2045 slave->last_link_up = jiffies;
2047 primary = rtnl_dereference(bond->primary_slave);
2048 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2049 /* prevent it from being the active one */
2050 bond_set_backup_slave(slave);
2051 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2052 /* make it immediately active */
2053 bond_set_active_slave(slave);
2054 } else if (slave != primary) {
2055 /* prevent it from being the active one */
2056 bond_set_backup_slave(slave);
2059 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2061 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2062 slave->duplex ? "full" : "half");
2064 /* notify ad that the link status has changed */
2065 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2066 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2068 if (bond_is_lb(bond))
2069 bond_alb_handle_link_change(bond, slave,
2072 if (BOND_MODE(bond) == BOND_MODE_XOR)
2073 bond_update_slave_arr(bond, NULL);
2075 if (!bond->curr_active_slave || slave == primary)
2080 case BOND_LINK_DOWN:
2081 if (slave->link_failure_count < UINT_MAX)
2082 slave->link_failure_count++;
2084 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2086 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2087 BOND_MODE(bond) == BOND_MODE_8023AD)
2088 bond_set_slave_inactive_flags(slave,
2089 BOND_SLAVE_NOTIFY_NOW);
2091 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2094 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2095 bond_3ad_handle_link_change(slave,
2098 if (bond_is_lb(bond))
2099 bond_alb_handle_link_change(bond, slave,
2102 if (BOND_MODE(bond) == BOND_MODE_XOR)
2103 bond_update_slave_arr(bond, NULL);
2105 if (slave == rcu_access_pointer(bond->curr_active_slave))
2111 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2112 slave->new_link, slave->dev->name);
2113 slave->new_link = BOND_LINK_NOCHANGE;
2120 bond_select_active_slave(bond);
2121 unblock_netpoll_tx();
2124 bond_set_carrier(bond);
2129 * Really a wrapper that splits the mii monitor into two phases: an
2130 * inspection, then (if inspection indicates something needs to be done)
2131 * an acquisition of appropriate locks followed by a commit phase to
2132 * implement whatever link state changes are indicated.
2134 static void bond_mii_monitor(struct work_struct *work)
2136 struct bonding *bond = container_of(work, struct bonding,
2138 bool should_notify_peers = false;
2139 unsigned long delay;
2141 delay = msecs_to_jiffies(bond->params.miimon);
2143 if (!bond_has_slaves(bond))
2148 should_notify_peers = bond_should_notify_peers(bond);
2150 if (bond_miimon_inspect(bond)) {
2153 /* Race avoidance with bond_close cancel of workqueue */
2154 if (!rtnl_trylock()) {
2156 should_notify_peers = false;
2160 bond_miimon_commit(bond);
2162 rtnl_unlock(); /* might sleep, hold no other locks */
2167 if (bond->params.miimon)
2168 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2170 if (should_notify_peers) {
2171 if (!rtnl_trylock())
2173 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2178 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2180 struct net_device *upper;
2181 struct list_head *iter;
2184 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2188 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2189 if (ip == bond_confirm_addr(upper, 0, ip)) {
2199 /* We go to the (large) trouble of VLAN tagging ARP frames because
2200 * switches in VLAN mode (especially if ports are configured as
2201 * "native" to a VLAN) might not pass non-tagged frames.
2203 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2204 __be32 dest_ip, __be32 src_ip,
2205 struct bond_vlan_tag *tags)
2207 struct sk_buff *skb;
2208 struct bond_vlan_tag *outer_tag = tags;
2210 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2211 arp_op, slave_dev->name, &dest_ip, &src_ip);
2213 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2214 NULL, slave_dev->dev_addr, NULL);
2217 net_err_ratelimited("ARP packet allocation failed\n");
2221 if (!tags || tags->vlan_proto == VLAN_N_VID)
2226 /* Go through all the tags backwards and add them to the packet */
2227 while (tags->vlan_proto != VLAN_N_VID) {
2228 if (!tags->vlan_id) {
2233 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2234 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2235 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2238 net_err_ratelimited("failed to insert inner VLAN tag\n");
2244 /* Set the outer tag */
2245 if (outer_tag->vlan_id) {
2246 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2247 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2248 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2249 outer_tag->vlan_id);
2256 /* Validate the device path between the @start_dev and the @end_dev.
2257 * The path is valid if the @end_dev is reachable through device
2259 * When the path is validated, collect any vlan information in the
2262 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2263 struct net_device *end_dev,
2266 struct bond_vlan_tag *tags;
2267 struct net_device *upper;
2268 struct list_head *iter;
2270 if (start_dev == end_dev) {
2271 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2273 return ERR_PTR(-ENOMEM);
2274 tags[level].vlan_proto = VLAN_N_VID;
2278 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2279 tags = bond_verify_device_path(upper, end_dev, level + 1);
2280 if (IS_ERR_OR_NULL(tags)) {
2285 if (is_vlan_dev(upper)) {
2286 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2287 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2296 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2299 struct bond_vlan_tag *tags;
2300 __be32 *targets = bond->params.arp_targets, addr;
2303 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2304 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2307 /* Find out through which dev should the packet go */
2308 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2311 /* there's no route to target - try to send arp
2312 * probe to generate any traffic (arp_validate=0)
2314 if (bond->params.arp_validate)
2315 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2318 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2323 /* bond device itself */
2324 if (rt->dst.dev == bond->dev)
2328 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2331 if (!IS_ERR_OR_NULL(tags))
2334 /* Not our device - skip */
2335 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2336 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2342 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2344 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2350 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2354 if (!sip || !bond_has_this_ip(bond, tip)) {
2355 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2360 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2362 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2366 slave->last_rx = jiffies;
2367 slave->target_last_arp_rx[i] = jiffies;
2370 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2371 struct slave *slave)
2373 struct arphdr *arp = (struct arphdr *)skb->data;
2374 struct slave *curr_active_slave;
2375 unsigned char *arp_ptr;
2377 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2379 if (!slave_do_arp_validate(bond, slave)) {
2380 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2381 !slave_do_arp_validate_only(bond))
2382 slave->last_rx = jiffies;
2383 return RX_HANDLER_ANOTHER;
2384 } else if (!is_arp) {
2385 return RX_HANDLER_ANOTHER;
2388 alen = arp_hdr_len(bond->dev);
2390 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2393 if (alen > skb_headlen(skb)) {
2394 arp = kmalloc(alen, GFP_ATOMIC);
2397 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2401 if (arp->ar_hln != bond->dev->addr_len ||
2402 skb->pkt_type == PACKET_OTHERHOST ||
2403 skb->pkt_type == PACKET_LOOPBACK ||
2404 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2405 arp->ar_pro != htons(ETH_P_IP) ||
2409 arp_ptr = (unsigned char *)(arp + 1);
2410 arp_ptr += bond->dev->addr_len;
2411 memcpy(&sip, arp_ptr, 4);
2412 arp_ptr += 4 + bond->dev->addr_len;
2413 memcpy(&tip, arp_ptr, 4);
2415 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2416 slave->dev->name, bond_slave_state(slave),
2417 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2420 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2422 /* Backup slaves won't see the ARP reply, but do come through
2423 * here for each ARP probe (so we swap the sip/tip to validate
2424 * the probe). In a "redundant switch, common router" type of
2425 * configuration, the ARP probe will (hopefully) travel from
2426 * the active, through one switch, the router, then the other
2427 * switch before reaching the backup.
2429 * We 'trust' the arp requests if there is an active slave and
2430 * it received valid arp reply(s) after it became active. This
2431 * is done to avoid endless looping when we can't reach the
2432 * arp_ip_target and fool ourselves with our own arp requests.
2435 if (bond_is_active_slave(slave))
2436 bond_validate_arp(bond, slave, sip, tip);
2437 else if (curr_active_slave &&
2438 time_after(slave_last_rx(bond, curr_active_slave),
2439 curr_active_slave->last_link_up))
2440 bond_validate_arp(bond, slave, tip, sip);
2443 if (arp != (struct arphdr *)skb->data)
2445 return RX_HANDLER_ANOTHER;
2448 /* function to verify if we're in the arp_interval timeslice, returns true if
2449 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2450 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2452 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2455 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2457 return time_in_range(jiffies,
2458 last_act - delta_in_ticks,
2459 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2462 /* This function is called regularly to monitor each slave's link
2463 * ensuring that traffic is being sent and received when arp monitoring
2464 * is used in load-balancing mode. if the adapter has been dormant, then an
2465 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2466 * arp monitoring in active backup mode.
2468 static void bond_loadbalance_arp_mon(struct work_struct *work)
2470 struct bonding *bond = container_of(work, struct bonding,
2472 struct slave *slave, *oldcurrent;
2473 struct list_head *iter;
2474 int do_failover = 0, slave_state_changed = 0;
2476 if (!bond_has_slaves(bond))
2481 oldcurrent = rcu_dereference(bond->curr_active_slave);
2482 /* see if any of the previous devices are up now (i.e. they have
2483 * xmt and rcv traffic). the curr_active_slave does not come into
2484 * the picture unless it is null. also, slave->last_link_up is not
2485 * needed here because we send an arp on each slave and give a slave
2486 * as long as it needs to get the tx/rx within the delta.
2487 * TODO: what about up/down delay in arp mode? it wasn't here before
2490 bond_for_each_slave_rcu(bond, slave, iter) {
2491 unsigned long trans_start = dev_trans_start(slave->dev);
2493 if (slave->link != BOND_LINK_UP) {
2494 if (bond_time_in_interval(bond, trans_start, 1) &&
2495 bond_time_in_interval(bond, slave->last_rx, 1)) {
2497 slave->link = BOND_LINK_UP;
2498 slave_state_changed = 1;
2500 /* primary_slave has no meaning in round-robin
2501 * mode. the window of a slave being up and
2502 * curr_active_slave being null after enslaving
2506 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2510 netdev_info(bond->dev, "interface %s is now up\n",
2515 /* slave->link == BOND_LINK_UP */
2517 /* not all switches will respond to an arp request
2518 * when the source ip is 0, so don't take the link down
2519 * if we don't know our ip yet
2521 if (!bond_time_in_interval(bond, trans_start, 2) ||
2522 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2524 slave->link = BOND_LINK_DOWN;
2525 slave_state_changed = 1;
2527 if (slave->link_failure_count < UINT_MAX)
2528 slave->link_failure_count++;
2530 netdev_info(bond->dev, "interface %s is now down\n",
2533 if (slave == oldcurrent)
2538 /* note: if switch is in round-robin mode, all links
2539 * must tx arp to ensure all links rx an arp - otherwise
2540 * links may oscillate or not come up at all; if switch is
2541 * in something like xor mode, there is nothing we can
2542 * do - all replies will be rx'ed on same link causing slaves
2543 * to be unstable during low/no traffic periods
2545 if (bond_slave_is_up(slave))
2546 bond_arp_send_all(bond, slave);
2551 if (do_failover || slave_state_changed) {
2552 if (!rtnl_trylock())
2555 if (slave_state_changed) {
2556 bond_slave_state_change(bond);
2557 if (BOND_MODE(bond) == BOND_MODE_XOR)
2558 bond_update_slave_arr(bond, NULL);
2562 bond_select_active_slave(bond);
2563 unblock_netpoll_tx();
2569 if (bond->params.arp_interval)
2570 queue_delayed_work(bond->wq, &bond->arp_work,
2571 msecs_to_jiffies(bond->params.arp_interval));
2574 /* Called to inspect slaves for active-backup mode ARP monitor link state
2575 * changes. Sets new_link in slaves to specify what action should take
2576 * place for the slave. Returns 0 if no changes are found, >0 if changes
2577 * to link states must be committed.
2579 * Called with rcu_read_lock held.
2581 static int bond_ab_arp_inspect(struct bonding *bond)
2583 unsigned long trans_start, last_rx;
2584 struct list_head *iter;
2585 struct slave *slave;
2588 bond_for_each_slave_rcu(bond, slave, iter) {
2589 slave->new_link = BOND_LINK_NOCHANGE;
2590 last_rx = slave_last_rx(bond, slave);
2592 if (slave->link != BOND_LINK_UP) {
2593 if (bond_time_in_interval(bond, last_rx, 1)) {
2594 slave->new_link = BOND_LINK_UP;
2600 /* Give slaves 2*delta after being enslaved or made
2601 * active. This avoids bouncing, as the last receive
2602 * times need a full ARP monitor cycle to be updated.
2604 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2607 /* Backup slave is down if:
2608 * - No current_arp_slave AND
2609 * - more than 3*delta since last receive AND
2610 * - the bond has an IP address
2612 * Note: a non-null current_arp_slave indicates
2613 * the curr_active_slave went down and we are
2614 * searching for a new one; under this condition
2615 * we only take the curr_active_slave down - this
2616 * gives each slave a chance to tx/rx traffic
2617 * before being taken out
2619 if (!bond_is_active_slave(slave) &&
2620 !rcu_access_pointer(bond->current_arp_slave) &&
2621 !bond_time_in_interval(bond, last_rx, 3)) {
2622 slave->new_link = BOND_LINK_DOWN;
2626 /* Active slave is down if:
2627 * - more than 2*delta since transmitting OR
2628 * - (more than 2*delta since receive AND
2629 * the bond has an IP address)
2631 trans_start = dev_trans_start(slave->dev);
2632 if (bond_is_active_slave(slave) &&
2633 (!bond_time_in_interval(bond, trans_start, 2) ||
2634 !bond_time_in_interval(bond, last_rx, 2))) {
2635 slave->new_link = BOND_LINK_DOWN;
2643 /* Called to commit link state changes noted by inspection step of
2644 * active-backup mode ARP monitor.
2646 * Called with RTNL hold.
2648 static void bond_ab_arp_commit(struct bonding *bond)
2650 unsigned long trans_start;
2651 struct list_head *iter;
2652 struct slave *slave;
2654 bond_for_each_slave(bond, slave, iter) {
2655 switch (slave->new_link) {
2656 case BOND_LINK_NOCHANGE:
2660 trans_start = dev_trans_start(slave->dev);
2661 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2662 (!rtnl_dereference(bond->curr_active_slave) &&
2663 bond_time_in_interval(bond, trans_start, 1))) {
2664 struct slave *current_arp_slave;
2666 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2667 bond_set_slave_link_state(slave, BOND_LINK_UP);
2668 if (current_arp_slave) {
2669 bond_set_slave_inactive_flags(
2671 BOND_SLAVE_NOTIFY_NOW);
2672 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2675 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2678 if (!rtnl_dereference(bond->curr_active_slave) ||
2679 slave == rtnl_dereference(bond->primary_slave))
2686 case BOND_LINK_DOWN:
2687 if (slave->link_failure_count < UINT_MAX)
2688 slave->link_failure_count++;
2690 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2691 bond_set_slave_inactive_flags(slave,
2692 BOND_SLAVE_NOTIFY_NOW);
2694 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2697 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2698 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2705 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2706 slave->new_link, slave->dev->name);
2712 bond_select_active_slave(bond);
2713 unblock_netpoll_tx();
2716 bond_set_carrier(bond);
2719 /* Send ARP probes for active-backup mode ARP monitor.
2721 * Called with rcu_read_lock held.
2723 static bool bond_ab_arp_probe(struct bonding *bond)
2725 struct slave *slave, *before = NULL, *new_slave = NULL,
2726 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2727 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2728 struct list_head *iter;
2730 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2732 if (curr_arp_slave && curr_active_slave)
2733 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2734 curr_arp_slave->dev->name,
2735 curr_active_slave->dev->name);
2737 if (curr_active_slave) {
2738 bond_arp_send_all(bond, curr_active_slave);
2739 return should_notify_rtnl;
2742 /* if we don't have a curr_active_slave, search for the next available
2743 * backup slave from the current_arp_slave and make it the candidate
2744 * for becoming the curr_active_slave
2747 if (!curr_arp_slave) {
2748 curr_arp_slave = bond_first_slave_rcu(bond);
2749 if (!curr_arp_slave)
2750 return should_notify_rtnl;
2753 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2755 bond_for_each_slave_rcu(bond, slave, iter) {
2756 if (!found && !before && bond_slave_is_up(slave))
2759 if (found && !new_slave && bond_slave_is_up(slave))
2761 /* if the link state is up at this point, we
2762 * mark it down - this can happen if we have
2763 * simultaneous link failures and
2764 * reselect_active_interface doesn't make this
2765 * one the current slave so it is still marked
2766 * up when it is actually down
2768 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2769 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2770 if (slave->link_failure_count < UINT_MAX)
2771 slave->link_failure_count++;
2773 bond_set_slave_inactive_flags(slave,
2774 BOND_SLAVE_NOTIFY_LATER);
2776 netdev_info(bond->dev, "backup interface %s is now down\n",
2779 if (slave == curr_arp_slave)
2783 if (!new_slave && before)
2789 bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2790 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2791 bond_arp_send_all(bond, new_slave);
2792 new_slave->last_link_up = jiffies;
2793 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2796 bond_for_each_slave_rcu(bond, slave, iter) {
2797 if (slave->should_notify) {
2798 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2802 return should_notify_rtnl;
2805 static void bond_activebackup_arp_mon(struct work_struct *work)
2807 struct bonding *bond = container_of(work, struct bonding,
2809 bool should_notify_peers = false;
2810 bool should_notify_rtnl = false;
2813 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2815 if (!bond_has_slaves(bond))
2820 should_notify_peers = bond_should_notify_peers(bond);
2822 if (bond_ab_arp_inspect(bond)) {
2825 /* Race avoidance with bond_close flush of workqueue */
2826 if (!rtnl_trylock()) {
2828 should_notify_peers = false;
2832 bond_ab_arp_commit(bond);
2838 should_notify_rtnl = bond_ab_arp_probe(bond);
2842 if (bond->params.arp_interval)
2843 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2845 if (should_notify_peers || should_notify_rtnl) {
2846 if (!rtnl_trylock())
2849 if (should_notify_peers)
2850 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2852 if (should_notify_rtnl)
2853 bond_slave_state_notify(bond);
2859 /*-------------------------- netdev event handling --------------------------*/
2861 /* Change device name */
2862 static int bond_event_changename(struct bonding *bond)
2864 bond_remove_proc_entry(bond);
2865 bond_create_proc_entry(bond);
2867 bond_debug_reregister(bond);
2872 static int bond_master_netdev_event(unsigned long event,
2873 struct net_device *bond_dev)
2875 struct bonding *event_bond = netdev_priv(bond_dev);
2878 case NETDEV_CHANGENAME:
2879 return bond_event_changename(event_bond);
2880 case NETDEV_UNREGISTER:
2881 bond_remove_proc_entry(event_bond);
2883 case NETDEV_REGISTER:
2884 bond_create_proc_entry(event_bond);
2886 case NETDEV_NOTIFY_PEERS:
2887 if (event_bond->send_peer_notif)
2888 event_bond->send_peer_notif--;
2897 static int bond_slave_netdev_event(unsigned long event,
2898 struct net_device *slave_dev)
2900 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2901 struct bonding *bond;
2902 struct net_device *bond_dev;
2906 /* A netdev event can be generated while enslaving a device
2907 * before netdev_rx_handler_register is called in which case
2908 * slave will be NULL
2912 bond_dev = slave->bond->dev;
2914 primary = rtnl_dereference(bond->primary_slave);
2917 case NETDEV_UNREGISTER:
2918 if (bond_dev->type != ARPHRD_ETHER)
2919 bond_release_and_destroy(bond_dev, slave_dev);
2921 bond_release(bond_dev, slave_dev);
2925 old_speed = slave->speed;
2926 old_duplex = slave->duplex;
2928 bond_update_speed_duplex(slave);
2930 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2931 if (old_speed != slave->speed)
2932 bond_3ad_adapter_speed_changed(slave);
2933 if (old_duplex != slave->duplex)
2934 bond_3ad_adapter_duplex_changed(slave);
2938 /* Refresh slave-array if applicable!
2939 * If the setup does not use miimon or arpmon (mode-specific!),
2940 * then these events will not cause the slave-array to be
2941 * refreshed. This will cause xmit to use a slave that is not
2942 * usable. Avoid such situation by refeshing the array at these
2943 * events. If these (miimon/arpmon) parameters are configured
2944 * then array gets refreshed twice and that should be fine!
2946 if (bond_mode_uses_xmit_hash(bond))
2947 bond_update_slave_arr(bond, NULL);
2949 case NETDEV_CHANGEMTU:
2950 /* TODO: Should slaves be allowed to
2951 * independently alter their MTU? For
2952 * an active-backup bond, slaves need
2953 * not be the same type of device, so
2954 * MTUs may vary. For other modes,
2955 * slaves arguably should have the
2956 * same MTUs. To do this, we'd need to
2957 * take over the slave's change_mtu
2958 * function for the duration of their
2962 case NETDEV_CHANGENAME:
2963 /* we don't care if we don't have primary set */
2964 if (!bond_uses_primary(bond) ||
2965 !bond->params.primary[0])
2968 if (slave == primary) {
2969 /* slave's name changed - he's no longer primary */
2970 RCU_INIT_POINTER(bond->primary_slave, NULL);
2971 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2972 /* we have a new primary slave */
2973 rcu_assign_pointer(bond->primary_slave, slave);
2974 } else { /* we didn't change primary - exit */
2978 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2979 primary ? slave_dev->name : "none");
2982 bond_select_active_slave(bond);
2983 unblock_netpoll_tx();
2985 case NETDEV_FEAT_CHANGE:
2986 bond_compute_features(bond);
2988 case NETDEV_RESEND_IGMP:
2989 /* Propagate to master device */
2990 call_netdevice_notifiers(event, slave->bond->dev);
2999 /* bond_netdev_event: handle netdev notifier chain events.
3001 * This function receives events for the netdev chain. The caller (an
3002 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3003 * locks for us to safely manipulate the slave devices (RTNL lock,
3006 static int bond_netdev_event(struct notifier_block *this,
3007 unsigned long event, void *ptr)
3009 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3011 netdev_dbg(event_dev, "event: %lx\n", event);
3013 if (!(event_dev->priv_flags & IFF_BONDING))
3016 if (event_dev->flags & IFF_MASTER) {
3017 netdev_dbg(event_dev, "IFF_MASTER\n");
3018 return bond_master_netdev_event(event, event_dev);
3021 if (event_dev->flags & IFF_SLAVE) {
3022 netdev_dbg(event_dev, "IFF_SLAVE\n");
3023 return bond_slave_netdev_event(event, event_dev);
3029 static struct notifier_block bond_netdev_notifier = {
3030 .notifier_call = bond_netdev_event,
3033 /*---------------------------- Hashing Policies -----------------------------*/
3035 /* L2 hash helper */
3036 static inline u32 bond_eth_hash(struct sk_buff *skb)
3038 struct ethhdr *ep, hdr_tmp;
3040 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3042 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3046 /* Extract the appropriate headers based on bond's xmit policy */
3047 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3048 struct flow_keys *fk)
3050 const struct ipv6hdr *iph6;
3051 const struct iphdr *iph;
3052 int noff, proto = -1;
3054 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3055 return skb_flow_dissect(skb, fk);
3058 noff = skb_network_offset(skb);
3059 if (skb->protocol == htons(ETH_P_IP)) {
3060 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3063 fk->src = iph->saddr;
3064 fk->dst = iph->daddr;
3065 noff += iph->ihl << 2;
3066 if (!ip_is_fragment(iph))
3067 proto = iph->protocol;
3068 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3069 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3071 iph6 = ipv6_hdr(skb);
3072 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
3073 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
3074 noff += sizeof(*iph6);
3075 proto = iph6->nexthdr;
3079 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3080 fk->ports = skb_flow_get_ports(skb, noff, proto);
3086 * bond_xmit_hash - generate a hash value based on the xmit policy
3087 * @bond: bonding device
3088 * @skb: buffer to use for headers
3090 * This function will extract the necessary headers from the skb buffer and use
3091 * them to generate a hash based on the xmit_policy set in the bonding device
3093 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3095 struct flow_keys flow;
3098 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3099 !bond_flow_dissect(bond, skb, &flow))
3100 return bond_eth_hash(skb);
3102 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3103 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3104 hash = bond_eth_hash(skb);
3106 hash = (__force u32)flow.ports;
3107 hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3108 hash ^= (hash >> 16);
3109 hash ^= (hash >> 8);
3114 /*-------------------------- Device entry points ----------------------------*/
3116 static void bond_work_init_all(struct bonding *bond)
3118 INIT_DELAYED_WORK(&bond->mcast_work,
3119 bond_resend_igmp_join_requests_delayed);
3120 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3121 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3122 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3123 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3125 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3126 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3127 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3130 static void bond_work_cancel_all(struct bonding *bond)
3132 cancel_delayed_work_sync(&bond->mii_work);
3133 cancel_delayed_work_sync(&bond->arp_work);
3134 cancel_delayed_work_sync(&bond->alb_work);
3135 cancel_delayed_work_sync(&bond->ad_work);
3136 cancel_delayed_work_sync(&bond->mcast_work);
3137 cancel_delayed_work_sync(&bond->slave_arr_work);
3140 static int bond_open(struct net_device *bond_dev)
3142 struct bonding *bond = netdev_priv(bond_dev);
3143 struct list_head *iter;
3144 struct slave *slave;
3146 /* reset slave->backup and slave->inactive */
3147 if (bond_has_slaves(bond)) {
3148 bond_for_each_slave(bond, slave, iter) {
3149 if (bond_uses_primary(bond) &&
3150 slave != rcu_access_pointer(bond->curr_active_slave)) {
3151 bond_set_slave_inactive_flags(slave,
3152 BOND_SLAVE_NOTIFY_NOW);
3153 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3154 bond_set_slave_active_flags(slave,
3155 BOND_SLAVE_NOTIFY_NOW);
3160 bond_work_init_all(bond);
3162 if (bond_is_lb(bond)) {
3163 /* bond_alb_initialize must be called before the timer
3166 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3168 if (bond->params.tlb_dynamic_lb)
3169 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3172 if (bond->params.miimon) /* link check interval, in milliseconds. */
3173 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3175 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3176 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3177 bond->recv_probe = bond_arp_rcv;
3180 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3181 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3182 /* register to receive LACPDUs */
3183 bond->recv_probe = bond_3ad_lacpdu_recv;
3184 bond_3ad_initiate_agg_selection(bond, 1);
3187 if (bond_mode_uses_xmit_hash(bond))
3188 bond_update_slave_arr(bond, NULL);
3193 static int bond_close(struct net_device *bond_dev)
3195 struct bonding *bond = netdev_priv(bond_dev);
3197 bond_work_cancel_all(bond);
3198 bond->send_peer_notif = 0;
3199 if (bond_is_lb(bond))
3200 bond_alb_deinitialize(bond);
3201 bond->recv_probe = NULL;
3206 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3207 struct rtnl_link_stats64 *stats)
3209 struct bonding *bond = netdev_priv(bond_dev);
3210 struct rtnl_link_stats64 temp;
3211 struct list_head *iter;
3212 struct slave *slave;
3214 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3216 bond_for_each_slave(bond, slave, iter) {
3217 const struct rtnl_link_stats64 *sstats =
3218 dev_get_stats(slave->dev, &temp);
3219 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3221 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3222 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3223 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3224 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3226 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3227 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3228 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3229 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3231 stats->multicast += sstats->multicast - pstats->multicast;
3232 stats->collisions += sstats->collisions - pstats->collisions;
3234 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3235 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3236 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3237 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3238 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3239 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3241 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3242 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3243 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3244 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3245 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3247 /* save off the slave stats for the next run */
3248 memcpy(pstats, sstats, sizeof(*sstats));
3250 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3255 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3257 struct bonding *bond = netdev_priv(bond_dev);
3258 struct net_device *slave_dev = NULL;
3259 struct ifbond k_binfo;
3260 struct ifbond __user *u_binfo = NULL;
3261 struct ifslave k_sinfo;
3262 struct ifslave __user *u_sinfo = NULL;
3263 struct mii_ioctl_data *mii = NULL;
3264 struct bond_opt_value newval;
3268 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3279 /* We do this again just in case we were called by SIOCGMIIREG
3280 * instead of SIOCGMIIPHY.
3286 if (mii->reg_num == 1) {
3288 if (netif_carrier_ok(bond->dev))
3289 mii->val_out = BMSR_LSTATUS;
3293 case BOND_INFO_QUERY_OLD:
3294 case SIOCBONDINFOQUERY:
3295 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3297 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3300 res = bond_info_query(bond_dev, &k_binfo);
3302 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3306 case BOND_SLAVE_INFO_QUERY_OLD:
3307 case SIOCBONDSLAVEINFOQUERY:
3308 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3310 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3313 res = bond_slave_info_query(bond_dev, &k_sinfo);
3315 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3323 net = dev_net(bond_dev);
3325 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3328 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3330 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3335 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3337 case BOND_ENSLAVE_OLD:
3338 case SIOCBONDENSLAVE:
3339 res = bond_enslave(bond_dev, slave_dev);
3341 case BOND_RELEASE_OLD:
3342 case SIOCBONDRELEASE:
3343 res = bond_release(bond_dev, slave_dev);
3345 case BOND_SETHWADDR_OLD:
3346 case SIOCBONDSETHWADDR:
3347 bond_set_dev_addr(bond_dev, slave_dev);
3350 case BOND_CHANGE_ACTIVE_OLD:
3351 case SIOCBONDCHANGEACTIVE:
3352 bond_opt_initstr(&newval, slave_dev->name);
3353 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3362 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3364 struct bonding *bond = netdev_priv(bond_dev);
3366 if (change & IFF_PROMISC)
3367 bond_set_promiscuity(bond,
3368 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3370 if (change & IFF_ALLMULTI)
3371 bond_set_allmulti(bond,
3372 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3375 static void bond_set_rx_mode(struct net_device *bond_dev)
3377 struct bonding *bond = netdev_priv(bond_dev);
3378 struct list_head *iter;
3379 struct slave *slave;
3382 if (bond_uses_primary(bond)) {
3383 slave = rcu_dereference(bond->curr_active_slave);
3385 dev_uc_sync(slave->dev, bond_dev);
3386 dev_mc_sync(slave->dev, bond_dev);
3389 bond_for_each_slave_rcu(bond, slave, iter) {
3390 dev_uc_sync_multiple(slave->dev, bond_dev);
3391 dev_mc_sync_multiple(slave->dev, bond_dev);
3397 static int bond_neigh_init(struct neighbour *n)
3399 struct bonding *bond = netdev_priv(n->dev);
3400 const struct net_device_ops *slave_ops;
3401 struct neigh_parms parms;
3402 struct slave *slave;
3405 slave = bond_first_slave(bond);
3408 slave_ops = slave->dev->netdev_ops;
3409 if (!slave_ops->ndo_neigh_setup)
3412 parms.neigh_setup = NULL;
3413 parms.neigh_cleanup = NULL;
3414 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3418 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3419 * after the last slave has been detached. Assumes that all slaves
3420 * utilize the same neigh_cleanup (true at this writing as only user
3423 n->parms->neigh_cleanup = parms.neigh_cleanup;
3425 if (!parms.neigh_setup)
3428 return parms.neigh_setup(n);
3431 /* The bonding ndo_neigh_setup is called at init time beofre any
3432 * slave exists. So we must declare proxy setup function which will
3433 * be used at run time to resolve the actual slave neigh param setup.
3435 * It's also called by master devices (such as vlans) to setup their
3436 * underlying devices. In that case - do nothing, we're already set up from
3439 static int bond_neigh_setup(struct net_device *dev,
3440 struct neigh_parms *parms)
3442 /* modify only our neigh_parms */
3443 if (parms->dev == dev)
3444 parms->neigh_setup = bond_neigh_init;
3449 /* Change the MTU of all of a master's slaves to match the master */
3450 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3452 struct bonding *bond = netdev_priv(bond_dev);
3453 struct slave *slave, *rollback_slave;
3454 struct list_head *iter;
3457 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3459 bond_for_each_slave(bond, slave, iter) {
3460 netdev_dbg(bond_dev, "s %p c_m %p\n",
3461 slave, slave->dev->netdev_ops->ndo_change_mtu);
3463 res = dev_set_mtu(slave->dev, new_mtu);
3466 /* If we failed to set the slave's mtu to the new value
3467 * we must abort the operation even in ACTIVE_BACKUP
3468 * mode, because if we allow the backup slaves to have
3469 * different mtu values than the active slave we'll
3470 * need to change their mtu when doing a failover. That
3471 * means changing their mtu from timer context, which
3472 * is probably not a good idea.
3474 netdev_dbg(bond_dev, "err %d %s\n", res,
3480 bond_dev->mtu = new_mtu;
3485 /* unwind from head to the slave that failed */
3486 bond_for_each_slave(bond, rollback_slave, iter) {
3489 if (rollback_slave == slave)
3492 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3494 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3495 tmp_res, rollback_slave->dev->name);
3502 /* Change HW address
3504 * Note that many devices must be down to change the HW address, and
3505 * downing the master releases all slaves. We can make bonds full of
3506 * bonding devices to test this, however.
3508 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3510 struct bonding *bond = netdev_priv(bond_dev);
3511 struct slave *slave, *rollback_slave;
3512 struct sockaddr *sa = addr, tmp_sa;
3513 struct list_head *iter;
3516 if (BOND_MODE(bond) == BOND_MODE_ALB)
3517 return bond_alb_set_mac_address(bond_dev, addr);
3520 netdev_dbg(bond_dev, "bond=%p\n", bond);
3522 /* If fail_over_mac is enabled, do nothing and return success.
3523 * Returning an error causes ifenslave to fail.
3525 if (bond->params.fail_over_mac &&
3526 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3529 if (!is_valid_ether_addr(sa->sa_data))
3530 return -EADDRNOTAVAIL;
3532 bond_for_each_slave(bond, slave, iter) {
3533 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3534 res = dev_set_mac_address(slave->dev, addr);
3536 /* TODO: consider downing the slave
3538 * User should expect communications
3539 * breakage anyway until ARP finish
3542 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3548 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3552 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3553 tmp_sa.sa_family = bond_dev->type;
3555 /* unwind from head to the slave that failed */
3556 bond_for_each_slave(bond, rollback_slave, iter) {
3559 if (rollback_slave == slave)
3562 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3564 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3565 tmp_res, rollback_slave->dev->name);
3573 * bond_xmit_slave_id - transmit skb through slave with slave_id
3574 * @bond: bonding device that is transmitting
3575 * @skb: buffer to transmit
3576 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3578 * This function tries to transmit through slave with slave_id but in case
3579 * it fails, it tries to find the first available slave for transmission.
3580 * The skb is consumed in all cases, thus the function is void.
3582 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3584 struct list_head *iter;
3585 struct slave *slave;
3588 /* Here we start from the slave with slave_id */
3589 bond_for_each_slave_rcu(bond, slave, iter) {
3591 if (bond_slave_can_tx(slave)) {
3592 bond_dev_queue_xmit(bond, skb, slave->dev);
3598 /* Here we start from the first slave up to slave_id */
3600 bond_for_each_slave_rcu(bond, slave, iter) {
3603 if (bond_slave_can_tx(slave)) {
3604 bond_dev_queue_xmit(bond, skb, slave->dev);
3608 /* no slave that can tx has been found */
3609 bond_tx_drop(bond->dev, skb);
3613 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3614 * @bond: bonding device to use
3616 * Based on the value of the bonding device's packets_per_slave parameter
3617 * this function generates a slave id, which is usually used as the next
3618 * slave to transmit through.
3620 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3623 struct reciprocal_value reciprocal_packets_per_slave;
3624 int packets_per_slave = bond->params.packets_per_slave;
3626 switch (packets_per_slave) {
3628 slave_id = prandom_u32();
3631 slave_id = bond->rr_tx_counter;
3634 reciprocal_packets_per_slave =
3635 bond->params.reciprocal_packets_per_slave;
3636 slave_id = reciprocal_divide(bond->rr_tx_counter,
3637 reciprocal_packets_per_slave);
3640 bond->rr_tx_counter++;
3645 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3647 struct bonding *bond = netdev_priv(bond_dev);
3648 struct iphdr *iph = ip_hdr(skb);
3649 struct slave *slave;
3652 /* Start with the curr_active_slave that joined the bond as the
3653 * default for sending IGMP traffic. For failover purposes one
3654 * needs to maintain some consistency for the interface that will
3655 * send the join/membership reports. The curr_active_slave found
3656 * will send all of this type of traffic.
3658 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3659 slave = rcu_dereference(bond->curr_active_slave);
3661 bond_dev_queue_xmit(bond, skb, slave->dev);
3663 bond_xmit_slave_id(bond, skb, 0);
3665 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3667 if (likely(slave_cnt)) {
3668 slave_id = bond_rr_gen_slave_id(bond);
3669 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3671 bond_tx_drop(bond_dev, skb);
3675 return NETDEV_TX_OK;
3678 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3679 * the bond has a usable interface.
3681 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3683 struct bonding *bond = netdev_priv(bond_dev);
3684 struct slave *slave;
3686 slave = rcu_dereference(bond->curr_active_slave);
3688 bond_dev_queue_xmit(bond, skb, slave->dev);
3690 bond_tx_drop(bond_dev, skb);
3692 return NETDEV_TX_OK;
3695 /* Use this to update slave_array when (a) it's not appropriate to update
3696 * slave_array right away (note that update_slave_array() may sleep)
3697 * and / or (b) RTNL is not held.
3699 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3701 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3704 /* Slave array work handler. Holds only RTNL */
3705 static void bond_slave_arr_handler(struct work_struct *work)
3707 struct bonding *bond = container_of(work, struct bonding,
3708 slave_arr_work.work);
3711 if (!rtnl_trylock())
3714 ret = bond_update_slave_arr(bond, NULL);
3717 pr_warn_ratelimited("Failed to update slave array from WT\n");
3723 bond_slave_arr_work_rearm(bond, 1);
3726 /* Build the usable slaves array in control path for modes that use xmit-hash
3727 * to determine the slave interface -
3728 * (a) BOND_MODE_8023AD
3730 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3732 * The caller is expected to hold RTNL only and NO other lock!
3734 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3736 struct slave *slave;
3737 struct list_head *iter;
3738 struct bond_up_slave *new_arr, *old_arr;
3743 #ifdef CONFIG_LOCKDEP
3744 WARN_ON(lockdep_is_held(&bond->mode_lock));
3747 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3751 pr_err("Failed to build slave-array.\n");
3754 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3755 struct ad_info ad_info;
3757 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3758 pr_debug("bond_3ad_get_active_agg_info failed\n");
3759 kfree_rcu(new_arr, rcu);
3760 /* No active aggragator means it's not safe to use
3761 * the previous array.
3763 old_arr = rtnl_dereference(bond->slave_arr);
3765 RCU_INIT_POINTER(bond->slave_arr, NULL);
3766 kfree_rcu(old_arr, rcu);
3770 slaves_in_agg = ad_info.ports;
3771 agg_id = ad_info.aggregator_id;
3773 bond_for_each_slave(bond, slave, iter) {
3774 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3775 struct aggregator *agg;
3777 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3778 if (!agg || agg->aggregator_identifier != agg_id)
3781 if (!bond_slave_can_tx(slave))
3783 if (skipslave == slave)
3785 new_arr->arr[new_arr->count++] = slave;
3788 old_arr = rtnl_dereference(bond->slave_arr);
3789 rcu_assign_pointer(bond->slave_arr, new_arr);
3791 kfree_rcu(old_arr, rcu);
3793 if (ret != 0 && skipslave) {
3796 /* Rare situation where caller has asked to skip a specific
3797 * slave but allocation failed (most likely!). BTW this is
3798 * only possible when the call is initiated from
3799 * __bond_release_one(). In this situation; overwrite the
3800 * skipslave entry in the array with the last entry from the
3801 * array to avoid a situation where the xmit path may choose
3802 * this to-be-skipped slave to send a packet out.
3804 old_arr = rtnl_dereference(bond->slave_arr);
3805 for (idx = 0; idx < old_arr->count; idx++) {
3806 if (skipslave == old_arr->arr[idx]) {
3808 old_arr->arr[old_arr->count-1];
3817 /* Use this Xmit function for 3AD as well as XOR modes. The current
3818 * usable slave array is formed in the control path. The xmit function
3819 * just calculates hash and sends the packet out.
3821 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3823 struct bonding *bond = netdev_priv(dev);
3824 struct slave *slave;
3825 struct bond_up_slave *slaves;
3828 slaves = rcu_dereference(bond->slave_arr);
3829 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3830 if (likely(count)) {
3831 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3832 bond_dev_queue_xmit(bond, skb, slave->dev);
3834 bond_tx_drop(dev, skb);
3837 return NETDEV_TX_OK;
3840 /* in broadcast mode, we send everything to all usable interfaces. */
3841 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3843 struct bonding *bond = netdev_priv(bond_dev);
3844 struct slave *slave = NULL;
3845 struct list_head *iter;
3847 bond_for_each_slave_rcu(bond, slave, iter) {
3848 if (bond_is_last_slave(bond, slave))
3850 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3851 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3854 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3855 bond_dev->name, __func__);
3858 bond_dev_queue_xmit(bond, skb2, slave->dev);
3861 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3862 bond_dev_queue_xmit(bond, skb, slave->dev);
3864 bond_tx_drop(bond_dev, skb);
3866 return NETDEV_TX_OK;
3869 /*------------------------- Device initialization ---------------------------*/
3871 /* Lookup the slave that corresponds to a qid */
3872 static inline int bond_slave_override(struct bonding *bond,
3873 struct sk_buff *skb)
3875 struct slave *slave = NULL;
3876 struct list_head *iter;
3878 if (!skb->queue_mapping)
3881 /* Find out if any slaves have the same mapping as this skb. */
3882 bond_for_each_slave_rcu(bond, slave, iter) {
3883 if (slave->queue_id == skb->queue_mapping) {
3884 if (bond_slave_is_up(slave) &&
3885 slave->link == BOND_LINK_UP) {
3886 bond_dev_queue_xmit(bond, skb, slave->dev);
3889 /* If the slave isn't UP, use default transmit policy. */
3898 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3899 void *accel_priv, select_queue_fallback_t fallback)
3901 /* This helper function exists to help dev_pick_tx get the correct
3902 * destination queue. Using a helper function skips a call to
3903 * skb_tx_hash and will put the skbs in the queue we expect on their
3904 * way down to the bonding driver.
3906 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3908 /* Save the original txq to restore before passing to the driver */
3909 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3911 if (unlikely(txq >= dev->real_num_tx_queues)) {
3913 txq -= dev->real_num_tx_queues;
3914 } while (txq >= dev->real_num_tx_queues);
3919 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3921 struct bonding *bond = netdev_priv(dev);
3923 if (bond_should_override_tx_queue(bond) &&
3924 !bond_slave_override(bond, skb))
3925 return NETDEV_TX_OK;
3927 switch (BOND_MODE(bond)) {
3928 case BOND_MODE_ROUNDROBIN:
3929 return bond_xmit_roundrobin(skb, dev);
3930 case BOND_MODE_ACTIVEBACKUP:
3931 return bond_xmit_activebackup(skb, dev);
3932 case BOND_MODE_8023AD:
3934 return bond_3ad_xor_xmit(skb, dev);
3935 case BOND_MODE_BROADCAST:
3936 return bond_xmit_broadcast(skb, dev);
3938 return bond_alb_xmit(skb, dev);
3940 return bond_tlb_xmit(skb, dev);
3942 /* Should never happen, mode already checked */
3943 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3945 bond_tx_drop(dev, skb);
3946 return NETDEV_TX_OK;
3950 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3952 struct bonding *bond = netdev_priv(dev);
3953 netdev_tx_t ret = NETDEV_TX_OK;
3955 /* If we risk deadlock from transmitting this in the
3956 * netpoll path, tell netpoll to queue the frame for later tx
3958 if (unlikely(is_netpoll_tx_blocked(dev)))
3959 return NETDEV_TX_BUSY;
3962 if (bond_has_slaves(bond))
3963 ret = __bond_start_xmit(skb, dev);
3965 bond_tx_drop(dev, skb);
3971 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3972 struct ethtool_cmd *ecmd)
3974 struct bonding *bond = netdev_priv(bond_dev);
3975 unsigned long speed = 0;
3976 struct list_head *iter;
3977 struct slave *slave;
3979 ecmd->duplex = DUPLEX_UNKNOWN;
3980 ecmd->port = PORT_OTHER;
3982 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3983 * do not need to check mode. Though link speed might not represent
3984 * the true receive or transmit bandwidth (not all modes are symmetric)
3985 * this is an accurate maximum.
3987 bond_for_each_slave(bond, slave, iter) {
3988 if (bond_slave_can_tx(slave)) {
3989 if (slave->speed != SPEED_UNKNOWN)
3990 speed += slave->speed;
3991 if (ecmd->duplex == DUPLEX_UNKNOWN &&
3992 slave->duplex != DUPLEX_UNKNOWN)
3993 ecmd->duplex = slave->duplex;
3996 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4001 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4002 struct ethtool_drvinfo *drvinfo)
4004 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4005 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4006 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4010 static const struct ethtool_ops bond_ethtool_ops = {
4011 .get_drvinfo = bond_ethtool_get_drvinfo,
4012 .get_settings = bond_ethtool_get_settings,
4013 .get_link = ethtool_op_get_link,
4016 static const struct net_device_ops bond_netdev_ops = {
4017 .ndo_init = bond_init,
4018 .ndo_uninit = bond_uninit,
4019 .ndo_open = bond_open,
4020 .ndo_stop = bond_close,
4021 .ndo_start_xmit = bond_start_xmit,
4022 .ndo_select_queue = bond_select_queue,
4023 .ndo_get_stats64 = bond_get_stats,
4024 .ndo_do_ioctl = bond_do_ioctl,
4025 .ndo_change_rx_flags = bond_change_rx_flags,
4026 .ndo_set_rx_mode = bond_set_rx_mode,
4027 .ndo_change_mtu = bond_change_mtu,
4028 .ndo_set_mac_address = bond_set_mac_address,
4029 .ndo_neigh_setup = bond_neigh_setup,
4030 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4031 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4032 #ifdef CONFIG_NET_POLL_CONTROLLER
4033 .ndo_netpoll_setup = bond_netpoll_setup,
4034 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4035 .ndo_poll_controller = bond_poll_controller,
4037 .ndo_add_slave = bond_enslave,
4038 .ndo_del_slave = bond_release,
4039 .ndo_fix_features = bond_fix_features,
4040 .ndo_bridge_setlink = ndo_dflt_netdev_switch_port_bridge_setlink,
4041 .ndo_bridge_dellink = ndo_dflt_netdev_switch_port_bridge_dellink,
4042 .ndo_features_check = passthru_features_check,
4045 static const struct device_type bond_type = {
4049 static void bond_destructor(struct net_device *bond_dev)
4051 struct bonding *bond = netdev_priv(bond_dev);
4053 destroy_workqueue(bond->wq);
4054 free_netdev(bond_dev);
4057 void bond_setup(struct net_device *bond_dev)
4059 struct bonding *bond = netdev_priv(bond_dev);
4061 spin_lock_init(&bond->mode_lock);
4062 bond->params = bonding_defaults;
4064 /* Initialize pointers */
4065 bond->dev = bond_dev;
4067 /* Initialize the device entry points */
4068 ether_setup(bond_dev);
4069 bond_dev->netdev_ops = &bond_netdev_ops;
4070 bond_dev->ethtool_ops = &bond_ethtool_ops;
4072 bond_dev->destructor = bond_destructor;
4074 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4076 /* Initialize the device options */
4077 bond_dev->tx_queue_len = 0;
4078 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4079 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
4080 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4082 /* don't acquire bond device's netif_tx_lock when transmitting */
4083 bond_dev->features |= NETIF_F_LLTX;
4085 /* By default, we declare the bond to be fully
4086 * VLAN hardware accelerated capable. Special
4087 * care is taken in the various xmit functions
4088 * when there are slaves that are not hw accel
4092 /* Don't allow bond devices to change network namespaces. */
4093 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4095 bond_dev->hw_features = BOND_VLAN_FEATURES |
4096 NETIF_F_HW_VLAN_CTAG_TX |
4097 NETIF_F_HW_VLAN_CTAG_RX |
4098 NETIF_F_HW_VLAN_CTAG_FILTER;
4100 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4101 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4102 bond_dev->features |= bond_dev->hw_features;
4105 /* Destroy a bonding device.
4106 * Must be under rtnl_lock when this function is called.
4108 static void bond_uninit(struct net_device *bond_dev)
4110 struct bonding *bond = netdev_priv(bond_dev);
4111 struct list_head *iter;
4112 struct slave *slave;
4113 struct bond_up_slave *arr;
4115 bond_netpoll_cleanup(bond_dev);
4117 /* Release the bonded slaves */
4118 bond_for_each_slave(bond, slave, iter)
4119 __bond_release_one(bond_dev, slave->dev, true);
4120 netdev_info(bond_dev, "Released all slaves\n");
4122 arr = rtnl_dereference(bond->slave_arr);
4124 RCU_INIT_POINTER(bond->slave_arr, NULL);
4125 kfree_rcu(arr, rcu);
4128 list_del(&bond->bond_list);
4130 bond_debug_unregister(bond);
4133 /*------------------------- Module initialization ---------------------------*/
4135 static int bond_check_params(struct bond_params *params)
4137 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4138 struct bond_opt_value newval;
4139 const struct bond_opt_value *valptr;
4140 int arp_all_targets_value;
4142 /* Convert string parameters. */
4144 bond_opt_initstr(&newval, mode);
4145 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4147 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4150 bond_mode = valptr->value;
4153 if (xmit_hash_policy) {
4154 if ((bond_mode != BOND_MODE_XOR) &&
4155 (bond_mode != BOND_MODE_8023AD) &&
4156 (bond_mode != BOND_MODE_TLB)) {
4157 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4158 bond_mode_name(bond_mode));
4160 bond_opt_initstr(&newval, xmit_hash_policy);
4161 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4164 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4168 xmit_hashtype = valptr->value;
4173 if (bond_mode != BOND_MODE_8023AD) {
4174 pr_info("lacp_rate param is irrelevant in mode %s\n",
4175 bond_mode_name(bond_mode));
4177 bond_opt_initstr(&newval, lacp_rate);
4178 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4181 pr_err("Error: Invalid lacp rate \"%s\"\n",
4185 lacp_fast = valptr->value;
4190 bond_opt_initstr(&newval, ad_select);
4191 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4194 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4197 params->ad_select = valptr->value;
4198 if (bond_mode != BOND_MODE_8023AD)
4199 pr_warn("ad_select param only affects 802.3ad mode\n");
4201 params->ad_select = BOND_AD_STABLE;
4204 if (max_bonds < 0) {
4205 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4206 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4207 max_bonds = BOND_DEFAULT_MAX_BONDS;
4211 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4217 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4222 if (downdelay < 0) {
4223 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4224 downdelay, INT_MAX);
4228 if ((use_carrier != 0) && (use_carrier != 1)) {
4229 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4234 if (num_peer_notif < 0 || num_peer_notif > 255) {
4235 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4240 /* reset values for 802.3ad/TLB/ALB */
4241 if (!bond_mode_uses_arp(bond_mode)) {
4243 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");
4244 pr_warn("Forcing miimon to 100msec\n");
4245 miimon = BOND_DEFAULT_MIIMON;
4249 if (tx_queues < 1 || tx_queues > 255) {
4250 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4251 tx_queues, BOND_DEFAULT_TX_QUEUES);
4252 tx_queues = BOND_DEFAULT_TX_QUEUES;
4255 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4256 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4258 all_slaves_active = 0;
4261 if (resend_igmp < 0 || resend_igmp > 255) {
4262 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4263 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4264 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4267 bond_opt_initval(&newval, packets_per_slave);
4268 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4269 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4270 packets_per_slave, USHRT_MAX);
4271 packets_per_slave = 1;
4274 if (bond_mode == BOND_MODE_ALB) {
4275 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",
4280 if (updelay || downdelay) {
4281 /* just warn the user the up/down delay will have
4282 * no effect since miimon is zero...
4284 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",
4285 updelay, downdelay);
4288 /* don't allow arp monitoring */
4290 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4291 miimon, arp_interval);
4295 if ((updelay % miimon) != 0) {
4296 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4297 updelay, miimon, (updelay / miimon) * miimon);
4302 if ((downdelay % miimon) != 0) {
4303 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4305 (downdelay / miimon) * miimon);
4308 downdelay /= miimon;
4311 if (arp_interval < 0) {
4312 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4313 arp_interval, INT_MAX);
4317 for (arp_ip_count = 0, i = 0;
4318 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4321 /* not a complete check, but good enough to catch mistakes */
4322 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4323 !bond_is_ip_target_ok(ip)) {
4324 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4328 if (bond_get_targets_ip(arp_target, ip) == -1)
4329 arp_target[arp_ip_count++] = ip;
4331 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4336 if (arp_interval && !arp_ip_count) {
4337 /* don't allow arping if no arp_ip_target given... */
4338 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4344 if (!arp_interval) {
4345 pr_err("arp_validate requires arp_interval\n");
4349 bond_opt_initstr(&newval, arp_validate);
4350 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4353 pr_err("Error: invalid arp_validate \"%s\"\n",
4357 arp_validate_value = valptr->value;
4359 arp_validate_value = 0;
4362 arp_all_targets_value = 0;
4363 if (arp_all_targets) {
4364 bond_opt_initstr(&newval, arp_all_targets);
4365 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4368 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4370 arp_all_targets_value = 0;
4372 arp_all_targets_value = valptr->value;
4377 pr_info("MII link monitoring set to %d ms\n", miimon);
4378 } else if (arp_interval) {
4379 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4380 arp_validate_value);
4381 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4382 arp_interval, valptr->string, arp_ip_count);
4384 for (i = 0; i < arp_ip_count; i++)
4385 pr_cont(" %s", arp_ip_target[i]);
4389 } else if (max_bonds) {
4390 /* miimon and arp_interval not set, we need one so things
4391 * work as expected, see bonding.txt for details
4393 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");
4396 if (primary && !bond_mode_uses_primary(bond_mode)) {
4397 /* currently, using a primary only makes sense
4398 * in active backup, TLB or ALB modes
4400 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4401 primary, bond_mode_name(bond_mode));
4405 if (primary && primary_reselect) {
4406 bond_opt_initstr(&newval, primary_reselect);
4407 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4410 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4414 primary_reselect_value = valptr->value;
4416 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4419 if (fail_over_mac) {
4420 bond_opt_initstr(&newval, fail_over_mac);
4421 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4424 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4428 fail_over_mac_value = valptr->value;
4429 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4430 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4432 fail_over_mac_value = BOND_FOM_NONE;
4435 if (lp_interval == 0) {
4436 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4437 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4438 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4441 /* fill params struct with the proper values */
4442 params->mode = bond_mode;
4443 params->xmit_policy = xmit_hashtype;
4444 params->miimon = miimon;
4445 params->num_peer_notif = num_peer_notif;
4446 params->arp_interval = arp_interval;
4447 params->arp_validate = arp_validate_value;
4448 params->arp_all_targets = arp_all_targets_value;
4449 params->updelay = updelay;
4450 params->downdelay = downdelay;
4451 params->use_carrier = use_carrier;
4452 params->lacp_fast = lacp_fast;
4453 params->primary[0] = 0;
4454 params->primary_reselect = primary_reselect_value;
4455 params->fail_over_mac = fail_over_mac_value;
4456 params->tx_queues = tx_queues;
4457 params->all_slaves_active = all_slaves_active;
4458 params->resend_igmp = resend_igmp;
4459 params->min_links = min_links;
4460 params->lp_interval = lp_interval;
4461 params->packets_per_slave = packets_per_slave;
4462 params->tlb_dynamic_lb = 1; /* Default value */
4463 if (packets_per_slave > 0) {
4464 params->reciprocal_packets_per_slave =
4465 reciprocal_value(packets_per_slave);
4467 /* reciprocal_packets_per_slave is unused if
4468 * packets_per_slave is 0 or 1, just initialize it
4470 params->reciprocal_packets_per_slave =
4471 (struct reciprocal_value) { 0 };
4475 strncpy(params->primary, primary, IFNAMSIZ);
4476 params->primary[IFNAMSIZ - 1] = 0;
4479 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4484 static struct lock_class_key bonding_netdev_xmit_lock_key;
4485 static struct lock_class_key bonding_netdev_addr_lock_key;
4486 static struct lock_class_key bonding_tx_busylock_key;
4488 static void bond_set_lockdep_class_one(struct net_device *dev,
4489 struct netdev_queue *txq,
4492 lockdep_set_class(&txq->_xmit_lock,
4493 &bonding_netdev_xmit_lock_key);
4496 static void bond_set_lockdep_class(struct net_device *dev)
4498 lockdep_set_class(&dev->addr_list_lock,
4499 &bonding_netdev_addr_lock_key);
4500 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4501 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4504 /* Called from registration process */
4505 static int bond_init(struct net_device *bond_dev)
4507 struct bonding *bond = netdev_priv(bond_dev);
4508 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4510 netdev_dbg(bond_dev, "Begin bond_init\n");
4512 bond->wq = create_singlethread_workqueue(bond_dev->name);
4516 bond_set_lockdep_class(bond_dev);
4518 list_add_tail(&bond->bond_list, &bn->dev_list);
4520 bond_prepare_sysfs_group(bond);
4522 bond_debug_register(bond);
4524 /* Ensure valid dev_addr */
4525 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4526 bond_dev->addr_assign_type == NET_ADDR_PERM)
4527 eth_hw_addr_random(bond_dev);
4532 unsigned int bond_get_num_tx_queues(void)
4537 /* Create a new bond based on the specified name and bonding parameters.
4538 * If name is NULL, obtain a suitable "bond%d" name for us.
4539 * Caller must NOT hold rtnl_lock; we need to release it here before we
4540 * set up our sysfs entries.
4542 int bond_create(struct net *net, const char *name)
4544 struct net_device *bond_dev;
4549 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4550 name ? name : "bond%d", NET_NAME_UNKNOWN,
4551 bond_setup, tx_queues);
4553 pr_err("%s: eek! can't alloc netdev!\n", name);
4558 dev_net_set(bond_dev, net);
4559 bond_dev->rtnl_link_ops = &bond_link_ops;
4561 res = register_netdevice(bond_dev);
4563 netif_carrier_off(bond_dev);
4567 bond_destructor(bond_dev);
4571 static int __net_init bond_net_init(struct net *net)
4573 struct bond_net *bn = net_generic(net, bond_net_id);
4576 INIT_LIST_HEAD(&bn->dev_list);
4578 bond_create_proc_dir(bn);
4579 bond_create_sysfs(bn);
4584 static void __net_exit bond_net_exit(struct net *net)
4586 struct bond_net *bn = net_generic(net, bond_net_id);
4587 struct bonding *bond, *tmp_bond;
4590 bond_destroy_sysfs(bn);
4592 /* Kill off any bonds created after unregistering bond rtnl ops */
4594 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4595 unregister_netdevice_queue(bond->dev, &list);
4596 unregister_netdevice_many(&list);
4599 bond_destroy_proc_dir(bn);
4602 static struct pernet_operations bond_net_ops = {
4603 .init = bond_net_init,
4604 .exit = bond_net_exit,
4606 .size = sizeof(struct bond_net),
4609 static int __init bonding_init(void)
4614 pr_info("%s", bond_version);
4616 res = bond_check_params(&bonding_defaults);
4620 res = register_pernet_subsys(&bond_net_ops);
4624 res = bond_netlink_init();
4628 bond_create_debugfs();
4630 for (i = 0; i < max_bonds; i++) {
4631 res = bond_create(&init_net, NULL);
4636 register_netdevice_notifier(&bond_netdev_notifier);
4640 bond_destroy_debugfs();
4641 bond_netlink_fini();
4643 unregister_pernet_subsys(&bond_net_ops);
4648 static void __exit bonding_exit(void)
4650 unregister_netdevice_notifier(&bond_netdev_notifier);
4652 bond_destroy_debugfs();
4654 bond_netlink_fini();
4655 unregister_pernet_subsys(&bond_net_ops);
4657 #ifdef CONFIG_NET_POLL_CONTROLLER
4658 /* Make sure we don't have an imbalance on our netpoll blocking */
4659 WARN_ON(atomic_read(&netpoll_block_tx));
4663 module_init(bonding_init);
4664 module_exit(bonding_exit);
4665 MODULE_LICENSE("GPL");
4666 MODULE_VERSION(DRV_VERSION);
4667 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4668 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");