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_dissector.h>
80 #include <net/switchdev.h>
81 #include <net/bonding.h>
82 #include <net/bond_3ad.h>
83 #include <net/bond_alb.h>
85 #include "bonding_priv.h"
87 /*---------------------------- Module parameters ----------------------------*/
89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
91 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
92 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
93 static int num_peer_notif = 1;
97 static int use_carrier = 1;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *arp_all_targets;
109 static char *fail_over_mac;
110 static int all_slaves_active;
111 static struct bond_params bonding_defaults;
112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 static int packets_per_slave = 1;
114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
116 module_param(max_bonds, int, 0);
117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
118 module_param(tx_queues, int, 0);
119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
122 "failover event (alias of num_unsol_na)");
123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
125 "failover event (alias of num_grat_arp)");
126 module_param(miimon, int, 0);
127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
128 module_param(updelay, int, 0);
129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
130 module_param(downdelay, int, 0);
131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
133 module_param(use_carrier, int, 0);
134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
135 "0 for off, 1 for on (default)");
136 module_param(mode, charp, 0);
137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
138 "1 for active-backup, 2 for balance-xor, "
139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
140 "6 for balance-alb");
141 module_param(primary, charp, 0);
142 MODULE_PARM_DESC(primary, "Primary network device to use");
143 module_param(primary_reselect, charp, 0);
144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
146 "0 for always (default), "
147 "1 for only if speed of primary is "
149 "2 for only on active slave "
151 module_param(lacp_rate, charp, 0);
152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
153 "0 for slow, 1 for fast");
154 module_param(ad_select, charp, 0);
155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
156 "0 for stable (default), 1 for bandwidth, "
158 module_param(min_links, int, 0);
159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
161 module_param(xmit_hash_policy, charp, 0);
162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
163 "0 for layer 2 (default), 1 for layer 3+4, "
164 "2 for layer 2+3, 3 for encap layer 2+3, "
165 "4 for encap layer 3+4");
166 module_param(arp_interval, int, 0);
167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
168 module_param_array(arp_ip_target, charp, NULL, 0);
169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
170 module_param(arp_validate, charp, 0);
171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
172 "0 for none (default), 1 for active, "
173 "2 for backup, 3 for all");
174 module_param(arp_all_targets, charp, 0);
175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
176 module_param(fail_over_mac, charp, 0);
177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
178 "the same MAC; 0 for none (default), "
179 "1 for active, 2 for follow");
180 module_param(all_slaves_active, int, 0);
181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
182 "by setting active flag for all slaves; "
183 "0 for never (default), 1 for always.");
184 module_param(resend_igmp, int, 0);
185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
187 module_param(packets_per_slave, int, 0);
188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
189 "mode; 0 for a random slave, 1 packet per "
190 "slave (default), >1 packets per slave.");
191 module_param(lp_interval, uint, 0);
192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
193 "the bonding driver sends learning packets to "
194 "each slaves peer switch. The default is 1.");
196 /*----------------------------- Global variables ----------------------------*/
198 #ifdef CONFIG_NET_POLL_CONTROLLER
199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
202 int bond_net_id __read_mostly;
204 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
205 static int arp_ip_count;
206 static int bond_mode = BOND_MODE_ROUNDROBIN;
207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
208 static int lacp_fast;
210 /*-------------------------- Forward declarations ---------------------------*/
212 static int bond_init(struct net_device *bond_dev);
213 static void bond_uninit(struct net_device *bond_dev);
214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
215 struct rtnl_link_stats64 *stats);
216 static void bond_slave_arr_handler(struct work_struct *work);
218 /*---------------------------- General routines -----------------------------*/
220 const char *bond_mode_name(int mode)
222 static const char *names[] = {
223 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
224 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
225 [BOND_MODE_XOR] = "load balancing (xor)",
226 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
227 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
228 [BOND_MODE_TLB] = "transmit load balancing",
229 [BOND_MODE_ALB] = "adaptive load balancing",
232 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
238 /*---------------------------------- VLAN -----------------------------------*/
241 * bond_dev_queue_xmit - Prepare skb for xmit.
243 * @bond: bond device that got this skb for tx.
244 * @skb: hw accel VLAN tagged skb to transmit
245 * @slave_dev: slave that is supposed to xmit this skbuff
247 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
248 struct net_device *slave_dev)
250 skb->dev = slave_dev;
252 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
253 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
254 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
256 if (unlikely(netpoll_tx_running(bond->dev)))
257 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
262 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
263 * We don't protect the slave list iteration with a lock because:
264 * a. This operation is performed in IOCTL context,
265 * b. The operation is protected by the RTNL semaphore in the 8021q code,
266 * c. Holding a lock with BH disabled while directly calling a base driver
267 * entry point is generally a BAD idea.
269 * The design of synchronization/protection for this operation in the 8021q
270 * module is good for one or more VLAN devices over a single physical device
271 * and cannot be extended for a teaming solution like bonding, so there is a
272 * potential race condition here where a net device from the vlan group might
273 * be referenced (either by a base driver or the 8021q code) while it is being
274 * removed from the system. However, it turns out we're not making matters
275 * worse, and if it works for regular VLAN usage it will work here too.
279 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
280 * @bond_dev: bonding net device that got called
281 * @vid: vlan id being added
283 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
284 __be16 proto, u16 vid)
286 struct bonding *bond = netdev_priv(bond_dev);
287 struct slave *slave, *rollback_slave;
288 struct list_head *iter;
291 bond_for_each_slave(bond, slave, iter) {
292 res = vlan_vid_add(slave->dev, proto, vid);
300 /* unwind to the slave that failed */
301 bond_for_each_slave(bond, rollback_slave, iter) {
302 if (rollback_slave == slave)
305 vlan_vid_del(rollback_slave->dev, proto, vid);
312 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
313 * @bond_dev: bonding net device that got called
314 * @vid: vlan id being removed
316 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
317 __be16 proto, u16 vid)
319 struct bonding *bond = netdev_priv(bond_dev);
320 struct list_head *iter;
323 bond_for_each_slave(bond, slave, iter)
324 vlan_vid_del(slave->dev, proto, vid);
326 if (bond_is_lb(bond))
327 bond_alb_clear_vlan(bond, vid);
332 /*------------------------------- Link status -------------------------------*/
334 /* Set the carrier state for the master according to the state of its
335 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
336 * do special 802.3ad magic.
338 * Returns zero if carrier state does not change, nonzero if it does.
340 int bond_set_carrier(struct bonding *bond)
342 struct list_head *iter;
345 if (!bond_has_slaves(bond))
348 if (BOND_MODE(bond) == BOND_MODE_8023AD)
349 return bond_3ad_set_carrier(bond);
351 bond_for_each_slave(bond, slave, iter) {
352 if (slave->link == BOND_LINK_UP) {
353 if (!netif_carrier_ok(bond->dev)) {
354 netif_carrier_on(bond->dev);
362 if (netif_carrier_ok(bond->dev)) {
363 netif_carrier_off(bond->dev);
369 /* Get link speed and duplex from the slave's base driver
370 * using ethtool. If for some reason the call fails or the
371 * values are invalid, set speed and duplex to -1,
374 static void bond_update_speed_duplex(struct slave *slave)
376 struct net_device *slave_dev = slave->dev;
377 struct ethtool_cmd ecmd;
381 slave->speed = SPEED_UNKNOWN;
382 slave->duplex = DUPLEX_UNKNOWN;
384 res = __ethtool_get_settings(slave_dev, &ecmd);
388 slave_speed = ethtool_cmd_speed(&ecmd);
389 if (slave_speed == 0 || slave_speed == ((__u32) -1))
392 switch (ecmd.duplex) {
400 slave->speed = slave_speed;
401 slave->duplex = ecmd.duplex;
406 const char *bond_slave_link_status(s8 link)
422 /* if <dev> supports MII link status reporting, check its link status.
424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425 * depending upon the setting of the use_carrier parameter.
427 * Return either BMSR_LSTATUS, meaning that the link is up (or we
428 * can't tell and just pretend it is), or 0, meaning that the link is
431 * If reporting is non-zero, instead of faking link up, return -1 if
432 * both ETHTOOL and MII ioctls fail (meaning the device does not
433 * support them). If use_carrier is set, return whatever it says.
434 * It'd be nice if there was a good way to tell if a driver supports
435 * netif_carrier, but there really isn't.
437 static int bond_check_dev_link(struct bonding *bond,
438 struct net_device *slave_dev, int reporting)
440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441 int (*ioctl)(struct net_device *, struct ifreq *, int);
443 struct mii_ioctl_data *mii;
445 if (!reporting && !netif_running(slave_dev))
448 if (bond->params.use_carrier)
449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
451 /* Try to get link status using Ethtool first. */
452 if (slave_dev->ethtool_ops->get_link)
453 return slave_dev->ethtool_ops->get_link(slave_dev) ?
456 /* Ethtool can't be used, fallback to MII ioctls. */
457 ioctl = slave_ops->ndo_do_ioctl;
459 /* TODO: set pointer to correct ioctl on a per team member
460 * bases to make this more efficient. that is, once
461 * we determine the correct ioctl, we will always
462 * call it and not the others for that team
466 /* We cannot assume that SIOCGMIIPHY will also read a
467 * register; not all network drivers (e.g., e100)
471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
474 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475 mii->reg_num = MII_BMSR;
476 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
477 return mii->val_out & BMSR_LSTATUS;
481 /* If reporting, report that either there's no dev->do_ioctl,
482 * or both SIOCGMIIREG and get_link failed (meaning that we
483 * cannot report link status). If not reporting, pretend
486 return reporting ? -1 : BMSR_LSTATUS;
489 /*----------------------------- Multicast list ------------------------------*/
491 /* Push the promiscuity flag down to appropriate slaves */
492 static int bond_set_promiscuity(struct bonding *bond, int inc)
494 struct list_head *iter;
497 if (bond_uses_primary(bond)) {
498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
501 err = dev_set_promiscuity(curr_active->dev, inc);
505 bond_for_each_slave(bond, slave, iter) {
506 err = dev_set_promiscuity(slave->dev, inc);
514 /* Push the allmulti flag down to all slaves */
515 static int bond_set_allmulti(struct bonding *bond, int inc)
517 struct list_head *iter;
520 if (bond_uses_primary(bond)) {
521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
524 err = dev_set_allmulti(curr_active->dev, inc);
528 bond_for_each_slave(bond, slave, iter) {
529 err = dev_set_allmulti(slave->dev, inc);
537 /* Retrieve the list of registered multicast addresses for the bonding
538 * device and retransmit an IGMP JOIN request to the current active
541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
543 struct bonding *bond = container_of(work, struct bonding,
546 if (!rtnl_trylock()) {
547 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
552 if (bond->igmp_retrans > 1) {
553 bond->igmp_retrans--;
554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
559 /* Flush bond's hardware addresses from slave */
560 static void bond_hw_addr_flush(struct net_device *bond_dev,
561 struct net_device *slave_dev)
563 struct bonding *bond = netdev_priv(bond_dev);
565 dev_uc_unsync(slave_dev, bond_dev);
566 dev_mc_unsync(slave_dev, bond_dev);
568 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
569 /* del lacpdu mc addr from mc list */
570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
572 dev_mc_del(slave_dev, lacpdu_multicast);
576 /*--------------------------- Active slave change ---------------------------*/
578 /* Update the hardware address list and promisc/allmulti for the new and
579 * old active slaves (if any). Modes that are not using primary keep all
580 * slaves up date at all times; only the modes that use primary need to call
581 * this function to swap these settings during a failover.
583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
584 struct slave *old_active)
587 if (bond->dev->flags & IFF_PROMISC)
588 dev_set_promiscuity(old_active->dev, -1);
590 if (bond->dev->flags & IFF_ALLMULTI)
591 dev_set_allmulti(old_active->dev, -1);
593 bond_hw_addr_flush(bond->dev, old_active->dev);
597 /* FIXME: Signal errors upstream. */
598 if (bond->dev->flags & IFF_PROMISC)
599 dev_set_promiscuity(new_active->dev, 1);
601 if (bond->dev->flags & IFF_ALLMULTI)
602 dev_set_allmulti(new_active->dev, 1);
604 netif_addr_lock_bh(bond->dev);
605 dev_uc_sync(new_active->dev, bond->dev);
606 dev_mc_sync(new_active->dev, bond->dev);
607 netif_addr_unlock_bh(bond->dev);
612 * bond_set_dev_addr - clone slave's address to bond
613 * @bond_dev: bond net device
614 * @slave_dev: slave net device
616 * Should be called with RTNL held.
618 static void bond_set_dev_addr(struct net_device *bond_dev,
619 struct net_device *slave_dev)
621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
622 bond_dev, slave_dev, slave_dev->addr_len);
623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
624 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
628 static struct slave *bond_get_old_active(struct bonding *bond,
629 struct slave *new_active)
632 struct list_head *iter;
634 bond_for_each_slave(bond, slave, iter) {
635 if (slave == new_active)
638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
645 /* bond_do_fail_over_mac
647 * Perform special MAC address swapping for fail_over_mac settings
651 static void bond_do_fail_over_mac(struct bonding *bond,
652 struct slave *new_active,
653 struct slave *old_active)
655 u8 tmp_mac[ETH_ALEN];
656 struct sockaddr saddr;
659 switch (bond->params.fail_over_mac) {
660 case BOND_FOM_ACTIVE:
662 bond_set_dev_addr(bond->dev, new_active->dev);
664 case BOND_FOM_FOLLOW:
665 /* if new_active && old_active, swap them
666 * if just old_active, do nothing (going to no active slave)
667 * if just new_active, set new_active to bond's MAC
673 old_active = bond_get_old_active(bond, new_active);
676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677 ether_addr_copy(saddr.sa_data,
678 old_active->dev->dev_addr);
679 saddr.sa_family = new_active->dev->type;
681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682 saddr.sa_family = bond->dev->type;
685 rv = dev_set_mac_address(new_active->dev, &saddr);
687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
688 -rv, new_active->dev->name);
695 ether_addr_copy(saddr.sa_data, tmp_mac);
696 saddr.sa_family = old_active->dev->type;
698 rv = dev_set_mac_address(old_active->dev, &saddr);
700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
701 -rv, new_active->dev->name);
705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
706 bond->params.fail_over_mac);
712 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
714 struct slave *prim = rtnl_dereference(bond->primary_slave);
715 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
717 if (!prim || prim->link != BOND_LINK_UP) {
718 if (!curr || curr->link != BOND_LINK_UP)
723 if (bond->force_primary) {
724 bond->force_primary = false;
728 if (!curr || curr->link != BOND_LINK_UP)
731 /* At this point, prim and curr are both up */
732 switch (bond->params.primary_reselect) {
733 case BOND_PRI_RESELECT_ALWAYS:
735 case BOND_PRI_RESELECT_BETTER:
736 if (prim->speed < curr->speed)
738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
741 case BOND_PRI_RESELECT_FAILURE:
744 netdev_err(bond->dev, "impossible primary_reselect %d\n",
745 bond->params.primary_reselect);
751 * bond_find_best_slave - select the best available slave to be the active one
752 * @bond: our bonding struct
754 static struct slave *bond_find_best_slave(struct bonding *bond)
756 struct slave *slave, *bestslave = NULL;
757 struct list_head *iter;
758 int mintime = bond->params.updelay;
760 slave = bond_choose_primary_or_current(bond);
764 bond_for_each_slave(bond, slave, iter) {
765 if (slave->link == BOND_LINK_UP)
767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
768 slave->delay < mintime) {
769 mintime = slave->delay;
777 static bool bond_should_notify_peers(struct bonding *bond)
782 slave = rcu_dereference(bond->curr_active_slave);
785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
786 slave ? slave->dev->name : "NULL");
788 if (!slave || !bond->send_peer_notif ||
789 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
796 * change_active_interface - change the active slave into the specified one
797 * @bond: our bonding struct
798 * @new: the new slave to make the active one
800 * Set the new slave to the bond's settings and unset them on the old
802 * Setting include flags, mc-list, promiscuity, allmulti, etc.
804 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
805 * because it is apparently the best available slave we have, even though its
806 * updelay hasn't timed out yet.
808 * Caller must hold RTNL.
810 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
812 struct slave *old_active;
816 old_active = rtnl_dereference(bond->curr_active_slave);
818 if (old_active == new_active)
822 new_active->last_link_up = jiffies;
824 if (new_active->link == BOND_LINK_BACK) {
825 if (bond_uses_primary(bond)) {
826 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
827 new_active->dev->name,
828 (bond->params.updelay - new_active->delay) * bond->params.miimon);
831 new_active->delay = 0;
832 bond_set_slave_link_state(new_active, BOND_LINK_UP);
834 if (BOND_MODE(bond) == BOND_MODE_8023AD)
835 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
837 if (bond_is_lb(bond))
838 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
840 if (bond_uses_primary(bond)) {
841 netdev_info(bond->dev, "making interface %s the new active one\n",
842 new_active->dev->name);
847 if (bond_uses_primary(bond))
848 bond_hw_addr_swap(bond, new_active, old_active);
850 if (bond_is_lb(bond)) {
851 bond_alb_handle_active_change(bond, new_active);
853 bond_set_slave_inactive_flags(old_active,
854 BOND_SLAVE_NOTIFY_NOW);
856 bond_set_slave_active_flags(new_active,
857 BOND_SLAVE_NOTIFY_NOW);
859 rcu_assign_pointer(bond->curr_active_slave, new_active);
862 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
864 bond_set_slave_inactive_flags(old_active,
865 BOND_SLAVE_NOTIFY_NOW);
868 bool should_notify_peers = false;
870 bond_set_slave_active_flags(new_active,
871 BOND_SLAVE_NOTIFY_NOW);
873 if (bond->params.fail_over_mac)
874 bond_do_fail_over_mac(bond, new_active,
877 if (netif_running(bond->dev)) {
878 bond->send_peer_notif =
879 bond->params.num_peer_notif;
880 should_notify_peers =
881 bond_should_notify_peers(bond);
884 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
885 if (should_notify_peers)
886 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
891 /* resend IGMP joins since active slave has changed or
892 * all were sent on curr_active_slave.
893 * resend only if bond is brought up with the affected
894 * bonding modes and the retransmission is enabled
896 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
897 ((bond_uses_primary(bond) && new_active) ||
898 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
899 bond->igmp_retrans = bond->params.resend_igmp;
900 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
905 * bond_select_active_slave - select a new active slave, if needed
906 * @bond: our bonding struct
908 * This functions should be called when one of the following occurs:
909 * - The old curr_active_slave has been released or lost its link.
910 * - The primary_slave has got its link back.
911 * - A slave has got its link back and there's no old curr_active_slave.
913 * Caller must hold RTNL.
915 void bond_select_active_slave(struct bonding *bond)
917 struct slave *best_slave;
922 best_slave = bond_find_best_slave(bond);
923 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
924 bond_change_active_slave(bond, best_slave);
925 rv = bond_set_carrier(bond);
929 if (netif_carrier_ok(bond->dev)) {
930 netdev_info(bond->dev, "first active interface up!\n");
932 netdev_info(bond->dev, "now running without any active interface!\n");
937 #ifdef CONFIG_NET_POLL_CONTROLLER
938 static inline int slave_enable_netpoll(struct slave *slave)
943 np = kzalloc(sizeof(*np), GFP_KERNEL);
948 err = __netpoll_setup(np, slave->dev);
957 static inline void slave_disable_netpoll(struct slave *slave)
959 struct netpoll *np = slave->np;
965 __netpoll_free_async(np);
968 static void bond_poll_controller(struct net_device *bond_dev)
970 struct bonding *bond = netdev_priv(bond_dev);
971 struct slave *slave = NULL;
972 struct list_head *iter;
973 struct ad_info ad_info;
974 struct netpoll_info *ni;
975 const struct net_device_ops *ops;
977 if (BOND_MODE(bond) == BOND_MODE_8023AD)
978 if (bond_3ad_get_active_agg_info(bond, &ad_info))
982 bond_for_each_slave_rcu(bond, slave, iter) {
983 ops = slave->dev->netdev_ops;
984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
987 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
988 struct aggregator *agg =
989 SLAVE_AD_INFO(slave)->port.aggregator;
992 agg->aggregator_identifier != ad_info.aggregator_id)
996 ni = rcu_dereference_bh(slave->dev->npinfo);
997 if (down_trylock(&ni->dev_lock))
999 ops->ndo_poll_controller(slave->dev);
1002 rcu_read_unlock_bh();
1005 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1007 struct bonding *bond = netdev_priv(bond_dev);
1008 struct list_head *iter;
1009 struct slave *slave;
1011 bond_for_each_slave(bond, slave, iter)
1012 if (bond_slave_is_up(slave))
1013 slave_disable_netpoll(slave);
1016 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1018 struct bonding *bond = netdev_priv(dev);
1019 struct list_head *iter;
1020 struct slave *slave;
1023 bond_for_each_slave(bond, slave, iter) {
1024 err = slave_enable_netpoll(slave);
1026 bond_netpoll_cleanup(dev);
1033 static inline int slave_enable_netpoll(struct slave *slave)
1037 static inline void slave_disable_netpoll(struct slave *slave)
1040 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1045 /*---------------------------------- IOCTL ----------------------------------*/
1047 static netdev_features_t bond_fix_features(struct net_device *dev,
1048 netdev_features_t features)
1050 struct bonding *bond = netdev_priv(dev);
1051 struct list_head *iter;
1052 netdev_features_t mask;
1053 struct slave *slave;
1057 features &= ~NETIF_F_ONE_FOR_ALL;
1058 features |= NETIF_F_ALL_FOR_ALL;
1060 bond_for_each_slave(bond, slave, iter) {
1061 features = netdev_increment_features(features,
1062 slave->dev->features,
1065 features = netdev_add_tso_features(features, mask);
1070 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1071 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1072 NETIF_F_HIGHDMA | NETIF_F_LRO)
1074 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1077 static void bond_compute_features(struct bonding *bond)
1079 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1080 IFF_XMIT_DST_RELEASE_PERM;
1081 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1082 netdev_features_t enc_features = BOND_ENC_FEATURES;
1083 struct net_device *bond_dev = bond->dev;
1084 struct list_head *iter;
1085 struct slave *slave;
1086 unsigned short max_hard_header_len = ETH_HLEN;
1087 unsigned int gso_max_size = GSO_MAX_SIZE;
1088 u16 gso_max_segs = GSO_MAX_SEGS;
1090 if (!bond_has_slaves(bond))
1092 vlan_features &= NETIF_F_ALL_FOR_ALL;
1094 bond_for_each_slave(bond, slave, iter) {
1095 vlan_features = netdev_increment_features(vlan_features,
1096 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1098 enc_features = netdev_increment_features(enc_features,
1099 slave->dev->hw_enc_features,
1101 dst_release_flag &= slave->dev->priv_flags;
1102 if (slave->dev->hard_header_len > max_hard_header_len)
1103 max_hard_header_len = slave->dev->hard_header_len;
1105 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1106 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1110 bond_dev->vlan_features = vlan_features;
1111 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1112 bond_dev->hard_header_len = max_hard_header_len;
1113 bond_dev->gso_max_segs = gso_max_segs;
1114 netif_set_gso_max_size(bond_dev, gso_max_size);
1116 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1117 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1118 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1119 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1121 netdev_change_features(bond_dev);
1124 static void bond_setup_by_slave(struct net_device *bond_dev,
1125 struct net_device *slave_dev)
1127 bond_dev->header_ops = slave_dev->header_ops;
1129 bond_dev->type = slave_dev->type;
1130 bond_dev->hard_header_len = slave_dev->hard_header_len;
1131 bond_dev->addr_len = slave_dev->addr_len;
1133 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1134 slave_dev->addr_len);
1137 /* On bonding slaves other than the currently active slave, suppress
1138 * duplicates except for alb non-mcast/bcast.
1140 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1141 struct slave *slave,
1142 struct bonding *bond)
1144 if (bond_is_slave_inactive(slave)) {
1145 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1146 skb->pkt_type != PACKET_BROADCAST &&
1147 skb->pkt_type != PACKET_MULTICAST)
1154 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1156 struct sk_buff *skb = *pskb;
1157 struct slave *slave;
1158 struct bonding *bond;
1159 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1161 int ret = RX_HANDLER_ANOTHER;
1163 skb = skb_share_check(skb, GFP_ATOMIC);
1165 return RX_HANDLER_CONSUMED;
1169 slave = bond_slave_get_rcu(skb->dev);
1172 recv_probe = ACCESS_ONCE(bond->recv_probe);
1174 ret = recv_probe(skb, bond, slave);
1175 if (ret == RX_HANDLER_CONSUMED) {
1181 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1182 return RX_HANDLER_EXACT;
1185 skb->dev = bond->dev;
1187 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1188 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1189 skb->pkt_type == PACKET_HOST) {
1191 if (unlikely(skb_cow_head(skb,
1192 skb->data - skb_mac_header(skb)))) {
1194 return RX_HANDLER_CONSUMED;
1196 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1202 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1203 struct net_device *slave_dev,
1204 struct slave *slave)
1208 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1211 slave_dev->flags |= IFF_SLAVE;
1212 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1216 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1217 struct net_device *slave_dev)
1219 netdev_upper_dev_unlink(slave_dev, bond_dev);
1220 slave_dev->flags &= ~IFF_SLAVE;
1221 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1224 static struct slave *bond_alloc_slave(struct bonding *bond)
1226 struct slave *slave = NULL;
1228 slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1232 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1233 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1235 if (!SLAVE_AD_INFO(slave)) {
1243 static void bond_free_slave(struct slave *slave)
1245 struct bonding *bond = bond_get_bond_by_slave(slave);
1247 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1248 kfree(SLAVE_AD_INFO(slave));
1253 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1255 info->bond_mode = BOND_MODE(bond);
1256 info->miimon = bond->params.miimon;
1257 info->num_slaves = bond->slave_cnt;
1260 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1262 strcpy(info->slave_name, slave->dev->name);
1263 info->link = slave->link;
1264 info->state = bond_slave_state(slave);
1265 info->link_failure_count = slave->link_failure_count;
1268 static void bond_netdev_notify(struct net_device *dev,
1269 struct netdev_bonding_info *info)
1272 netdev_bonding_info_change(dev, info);
1276 static void bond_netdev_notify_work(struct work_struct *_work)
1278 struct netdev_notify_work *w =
1279 container_of(_work, struct netdev_notify_work, work.work);
1281 bond_netdev_notify(w->dev, &w->bonding_info);
1286 void bond_queue_slave_event(struct slave *slave)
1288 struct bonding *bond = slave->bond;
1289 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1294 dev_hold(slave->dev);
1295 nnw->dev = slave->dev;
1296 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1297 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1298 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1300 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1303 /* enslave device <slave> to bond device <master> */
1304 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1306 struct bonding *bond = netdev_priv(bond_dev);
1307 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1308 struct slave *new_slave = NULL, *prev_slave;
1309 struct sockaddr addr;
1313 if (!bond->params.use_carrier &&
1314 slave_dev->ethtool_ops->get_link == NULL &&
1315 slave_ops->ndo_do_ioctl == NULL) {
1316 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1320 /* already enslaved */
1321 if (slave_dev->flags & IFF_SLAVE) {
1322 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1326 if (bond_dev == slave_dev) {
1327 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1331 /* vlan challenged mutual exclusion */
1332 /* no need to lock since we're protected by rtnl_lock */
1333 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1334 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1336 if (vlan_uses_dev(bond_dev)) {
1337 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1338 slave_dev->name, bond_dev->name);
1341 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1342 slave_dev->name, slave_dev->name,
1346 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1350 /* Old ifenslave binaries are no longer supported. These can
1351 * be identified with moderate accuracy by the state of the slave:
1352 * the current ifenslave will set the interface down prior to
1353 * enslaving it; the old ifenslave will not.
1355 if ((slave_dev->flags & IFF_UP)) {
1356 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1359 goto err_undo_flags;
1362 /* set bonding device ether type by slave - bonding netdevices are
1363 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1364 * there is a need to override some of the type dependent attribs/funcs.
1366 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1367 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1369 if (!bond_has_slaves(bond)) {
1370 if (bond_dev->type != slave_dev->type) {
1371 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1372 bond_dev->type, slave_dev->type);
1374 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1376 res = notifier_to_errno(res);
1378 netdev_err(bond_dev, "refused to change device type\n");
1380 goto err_undo_flags;
1383 /* Flush unicast and multicast addresses */
1384 dev_uc_flush(bond_dev);
1385 dev_mc_flush(bond_dev);
1387 if (slave_dev->type != ARPHRD_ETHER)
1388 bond_setup_by_slave(bond_dev, slave_dev);
1390 ether_setup(bond_dev);
1391 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1394 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1397 } else if (bond_dev->type != slave_dev->type) {
1398 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1399 slave_dev->name, slave_dev->type, bond_dev->type);
1401 goto err_undo_flags;
1404 if (slave_ops->ndo_set_mac_address == NULL) {
1405 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1406 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1407 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1408 if (!bond_has_slaves(bond)) {
1409 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1410 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1412 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");
1414 goto err_undo_flags;
1419 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1421 /* If this is the first slave, then we need to set the master's hardware
1422 * address to be the same as the slave's.
1424 if (!bond_has_slaves(bond) &&
1425 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1426 bond_set_dev_addr(bond->dev, slave_dev);
1428 new_slave = bond_alloc_slave(bond);
1431 goto err_undo_flags;
1434 new_slave->bond = bond;
1435 new_slave->dev = slave_dev;
1436 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1437 * is set via sysfs or module option if desired.
1439 new_slave->queue_id = 0;
1441 /* Save slave's original mtu and then set it to match the bond */
1442 new_slave->original_mtu = slave_dev->mtu;
1443 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1445 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1449 /* Save slave's original ("permanent") mac address for modes
1450 * that need it, and for restoring it upon release, and then
1451 * set it to the master's address
1453 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1455 if (!bond->params.fail_over_mac ||
1456 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1457 /* Set slave to master's mac address. The application already
1458 * set the master's mac address to that of the first slave
1460 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1461 addr.sa_family = slave_dev->type;
1462 res = dev_set_mac_address(slave_dev, &addr);
1464 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1465 goto err_restore_mtu;
1469 /* open the slave since the application closed it */
1470 res = dev_open(slave_dev);
1472 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1473 goto err_restore_mac;
1476 slave_dev->priv_flags |= IFF_BONDING;
1477 /* initialize slave stats */
1478 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1480 if (bond_is_lb(bond)) {
1481 /* bond_alb_init_slave() must be called before all other stages since
1482 * it might fail and we do not want to have to undo everything
1484 res = bond_alb_init_slave(bond, new_slave);
1489 /* If the mode uses primary, then the following is handled by
1490 * bond_change_active_slave().
1492 if (!bond_uses_primary(bond)) {
1493 /* set promiscuity level to new slave */
1494 if (bond_dev->flags & IFF_PROMISC) {
1495 res = dev_set_promiscuity(slave_dev, 1);
1500 /* set allmulti level to new slave */
1501 if (bond_dev->flags & IFF_ALLMULTI) {
1502 res = dev_set_allmulti(slave_dev, 1);
1507 netif_addr_lock_bh(bond_dev);
1509 dev_mc_sync_multiple(slave_dev, bond_dev);
1510 dev_uc_sync_multiple(slave_dev, bond_dev);
1512 netif_addr_unlock_bh(bond_dev);
1515 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1516 /* add lacpdu mc addr to mc list */
1517 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1519 dev_mc_add(slave_dev, lacpdu_multicast);
1522 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1524 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1529 prev_slave = bond_last_slave(bond);
1531 new_slave->delay = 0;
1532 new_slave->link_failure_count = 0;
1534 bond_update_speed_duplex(new_slave);
1536 new_slave->last_rx = jiffies -
1537 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1538 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1539 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1541 if (bond->params.miimon && !bond->params.use_carrier) {
1542 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1544 if ((link_reporting == -1) && !bond->params.arp_interval) {
1545 /* miimon is set but a bonded network driver
1546 * does not support ETHTOOL/MII and
1547 * arp_interval is not set. Note: if
1548 * use_carrier is enabled, we will never go
1549 * here (because netif_carrier is always
1550 * supported); thus, we don't need to change
1551 * the messages for netif_carrier.
1553 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",
1555 } else if (link_reporting == -1) {
1556 /* unable get link status using mii/ethtool */
1557 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",
1562 /* check for initial state */
1563 if (bond->params.miimon) {
1564 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1565 if (bond->params.updelay) {
1566 bond_set_slave_link_state(new_slave,
1568 new_slave->delay = bond->params.updelay;
1570 bond_set_slave_link_state(new_slave,
1574 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1576 } else if (bond->params.arp_interval) {
1577 bond_set_slave_link_state(new_slave,
1578 (netif_carrier_ok(slave_dev) ?
1579 BOND_LINK_UP : BOND_LINK_DOWN));
1581 bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1584 if (new_slave->link != BOND_LINK_DOWN)
1585 new_slave->last_link_up = jiffies;
1586 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1587 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1588 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1590 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1591 /* if there is a primary slave, remember it */
1592 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1593 rcu_assign_pointer(bond->primary_slave, new_slave);
1594 bond->force_primary = true;
1598 switch (BOND_MODE(bond)) {
1599 case BOND_MODE_ACTIVEBACKUP:
1600 bond_set_slave_inactive_flags(new_slave,
1601 BOND_SLAVE_NOTIFY_NOW);
1603 case BOND_MODE_8023AD:
1604 /* in 802.3ad mode, the internal mechanism
1605 * will activate the slaves in the selected
1608 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1609 /* if this is the first slave */
1611 SLAVE_AD_INFO(new_slave)->id = 1;
1612 /* Initialize AD with the number of times that the AD timer is called in 1 second
1613 * can be called only after the mac address of the bond is set
1615 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1617 SLAVE_AD_INFO(new_slave)->id =
1618 SLAVE_AD_INFO(prev_slave)->id + 1;
1621 bond_3ad_bind_slave(new_slave);
1625 bond_set_active_slave(new_slave);
1626 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1629 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1631 /* always active in trunk mode */
1632 bond_set_active_slave(new_slave);
1634 /* In trunking mode there is little meaning to curr_active_slave
1635 * anyway (it holds no special properties of the bond device),
1636 * so we can change it without calling change_active_interface()
1638 if (!rcu_access_pointer(bond->curr_active_slave) &&
1639 new_slave->link == BOND_LINK_UP)
1640 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1643 } /* switch(bond_mode) */
1645 #ifdef CONFIG_NET_POLL_CONTROLLER
1646 slave_dev->npinfo = bond->dev->npinfo;
1647 if (slave_dev->npinfo) {
1648 if (slave_enable_netpoll(new_slave)) {
1649 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1656 if (!(bond_dev->features & NETIF_F_LRO))
1657 dev_disable_lro(slave_dev);
1659 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1662 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1666 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1668 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1669 goto err_unregister;
1672 res = bond_sysfs_slave_add(new_slave);
1674 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1675 goto err_upper_unlink;
1679 bond_compute_features(bond);
1680 bond_set_carrier(bond);
1682 if (bond_uses_primary(bond)) {
1684 bond_select_active_slave(bond);
1685 unblock_netpoll_tx();
1688 if (bond_mode_uses_xmit_hash(bond))
1689 bond_update_slave_arr(bond, NULL);
1691 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1693 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1694 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1696 /* enslave is successful */
1697 bond_queue_slave_event(new_slave);
1700 /* Undo stages on error */
1702 bond_upper_dev_unlink(bond_dev, slave_dev);
1705 netdev_rx_handler_unregister(slave_dev);
1708 if (!bond_uses_primary(bond))
1709 bond_hw_addr_flush(bond_dev, slave_dev);
1711 vlan_vids_del_by_dev(slave_dev, bond_dev);
1712 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1713 RCU_INIT_POINTER(bond->primary_slave, NULL);
1714 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1716 bond_change_active_slave(bond, NULL);
1717 bond_select_active_slave(bond);
1718 unblock_netpoll_tx();
1720 /* either primary_slave or curr_active_slave might've changed */
1722 slave_disable_netpoll(new_slave);
1725 slave_dev->priv_flags &= ~IFF_BONDING;
1726 dev_close(slave_dev);
1729 if (!bond->params.fail_over_mac ||
1730 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1731 /* XXX TODO - fom follow mode needs to change master's
1732 * MAC if this slave's MAC is in use by the bond, or at
1733 * least print a warning.
1735 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1736 addr.sa_family = slave_dev->type;
1737 dev_set_mac_address(slave_dev, &addr);
1741 dev_set_mtu(slave_dev, new_slave->original_mtu);
1744 bond_free_slave(new_slave);
1747 /* Enslave of first slave has failed and we need to fix master's mac */
1748 if (!bond_has_slaves(bond)) {
1749 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1750 slave_dev->dev_addr))
1751 eth_hw_addr_random(bond_dev);
1752 if (bond_dev->type != ARPHRD_ETHER) {
1753 ether_setup(bond_dev);
1754 bond_dev->flags |= IFF_MASTER;
1755 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1762 /* Try to release the slave device <slave> from the bond device <master>
1763 * It is legal to access curr_active_slave without a lock because all the function
1764 * is RTNL-locked. If "all" is true it means that the function is being called
1765 * while destroying a bond interface and all slaves are being released.
1767 * The rules for slave state should be:
1768 * for Active/Backup:
1769 * Active stays on all backups go down
1770 * for Bonded connections:
1771 * The first up interface should be left on and all others downed.
1773 static int __bond_release_one(struct net_device *bond_dev,
1774 struct net_device *slave_dev,
1777 struct bonding *bond = netdev_priv(bond_dev);
1778 struct slave *slave, *oldcurrent;
1779 struct sockaddr addr;
1780 int old_flags = bond_dev->flags;
1781 netdev_features_t old_features = bond_dev->features;
1783 /* slave is not a slave or master is not master of this slave */
1784 if (!(slave_dev->flags & IFF_SLAVE) ||
1785 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1786 netdev_dbg(bond_dev, "cannot release %s\n",
1793 slave = bond_get_slave_by_dev(bond, slave_dev);
1795 /* not a slave of this bond */
1796 netdev_info(bond_dev, "%s not enslaved\n",
1798 unblock_netpoll_tx();
1802 bond_sysfs_slave_del(slave);
1804 /* recompute stats just before removing the slave */
1805 bond_get_stats(bond->dev, &bond->bond_stats);
1807 bond_upper_dev_unlink(bond_dev, slave_dev);
1808 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1809 * for this slave anymore.
1811 netdev_rx_handler_unregister(slave_dev);
1813 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1814 bond_3ad_unbind_slave(slave);
1816 if (bond_mode_uses_xmit_hash(bond))
1817 bond_update_slave_arr(bond, slave);
1819 netdev_info(bond_dev, "Releasing %s interface %s\n",
1820 bond_is_active_slave(slave) ? "active" : "backup",
1823 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1825 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1827 if (!all && (!bond->params.fail_over_mac ||
1828 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1829 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1830 bond_has_slaves(bond))
1831 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",
1832 slave_dev->name, slave->perm_hwaddr,
1833 bond_dev->name, slave_dev->name);
1836 if (rtnl_dereference(bond->primary_slave) == slave)
1837 RCU_INIT_POINTER(bond->primary_slave, NULL);
1839 if (oldcurrent == slave)
1840 bond_change_active_slave(bond, NULL);
1842 if (bond_is_lb(bond)) {
1843 /* Must be called only after the slave has been
1844 * detached from the list and the curr_active_slave
1845 * has been cleared (if our_slave == old_current),
1846 * but before a new active slave is selected.
1848 bond_alb_deinit_slave(bond, slave);
1852 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1853 } else if (oldcurrent == slave) {
1854 /* Note that we hold RTNL over this sequence, so there
1855 * is no concern that another slave add/remove event
1858 bond_select_active_slave(bond);
1861 if (!bond_has_slaves(bond)) {
1862 bond_set_carrier(bond);
1863 eth_hw_addr_random(bond_dev);
1866 unblock_netpoll_tx();
1870 if (!bond_has_slaves(bond)) {
1871 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1872 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1875 bond_compute_features(bond);
1876 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1877 (old_features & NETIF_F_VLAN_CHALLENGED))
1878 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1879 slave_dev->name, bond_dev->name);
1881 vlan_vids_del_by_dev(slave_dev, bond_dev);
1883 /* If the mode uses primary, then this case was handled above by
1884 * bond_change_active_slave(..., NULL)
1886 if (!bond_uses_primary(bond)) {
1887 /* unset promiscuity level from slave
1888 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1889 * of the IFF_PROMISC flag in the bond_dev, but we need the
1890 * value of that flag before that change, as that was the value
1891 * when this slave was attached, so we cache at the start of the
1892 * function and use it here. Same goes for ALLMULTI below
1894 if (old_flags & IFF_PROMISC)
1895 dev_set_promiscuity(slave_dev, -1);
1897 /* unset allmulti level from slave */
1898 if (old_flags & IFF_ALLMULTI)
1899 dev_set_allmulti(slave_dev, -1);
1901 bond_hw_addr_flush(bond_dev, slave_dev);
1904 slave_disable_netpoll(slave);
1906 /* close slave before restoring its mac address */
1907 dev_close(slave_dev);
1909 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1910 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1911 /* restore original ("permanent") mac address */
1912 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1913 addr.sa_family = slave_dev->type;
1914 dev_set_mac_address(slave_dev, &addr);
1917 dev_set_mtu(slave_dev, slave->original_mtu);
1919 slave_dev->priv_flags &= ~IFF_BONDING;
1921 bond_free_slave(slave);
1926 /* A wrapper used because of ndo_del_link */
1927 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1929 return __bond_release_one(bond_dev, slave_dev, false);
1932 /* First release a slave and then destroy the bond if no more slaves are left.
1933 * Must be under rtnl_lock when this function is called.
1935 static int bond_release_and_destroy(struct net_device *bond_dev,
1936 struct net_device *slave_dev)
1938 struct bonding *bond = netdev_priv(bond_dev);
1941 ret = bond_release(bond_dev, slave_dev);
1942 if (ret == 0 && !bond_has_slaves(bond)) {
1943 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1944 netdev_info(bond_dev, "Destroying bond %s\n",
1946 bond_remove_proc_entry(bond);
1947 unregister_netdevice(bond_dev);
1952 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1954 struct bonding *bond = netdev_priv(bond_dev);
1955 bond_fill_ifbond(bond, info);
1959 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1961 struct bonding *bond = netdev_priv(bond_dev);
1962 struct list_head *iter;
1963 int i = 0, res = -ENODEV;
1964 struct slave *slave;
1966 bond_for_each_slave(bond, slave, iter) {
1967 if (i++ == (int)info->slave_id) {
1969 bond_fill_ifslave(slave, info);
1977 /*-------------------------------- Monitoring -------------------------------*/
1979 /* called with rcu_read_lock() */
1980 static int bond_miimon_inspect(struct bonding *bond)
1982 int link_state, commit = 0;
1983 struct list_head *iter;
1984 struct slave *slave;
1985 bool ignore_updelay;
1987 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1989 bond_for_each_slave_rcu(bond, slave, iter) {
1990 slave->new_link = BOND_LINK_NOCHANGE;
1992 link_state = bond_check_dev_link(bond, slave->dev, 0);
1994 switch (slave->link) {
1999 bond_set_slave_link_state(slave, BOND_LINK_FAIL);
2000 slave->delay = bond->params.downdelay;
2002 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2004 BOND_MODE_ACTIVEBACKUP) ?
2005 (bond_is_active_slave(slave) ?
2006 "active " : "backup ") : "",
2008 bond->params.downdelay * bond->params.miimon);
2011 case BOND_LINK_FAIL:
2013 /* recovered before downdelay expired */
2014 bond_set_slave_link_state(slave, BOND_LINK_UP);
2015 slave->last_link_up = jiffies;
2016 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2017 (bond->params.downdelay - slave->delay) *
2018 bond->params.miimon,
2023 if (slave->delay <= 0) {
2024 slave->new_link = BOND_LINK_DOWN;
2032 case BOND_LINK_DOWN:
2036 bond_set_slave_link_state(slave, BOND_LINK_BACK);
2037 slave->delay = bond->params.updelay;
2040 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2042 ignore_updelay ? 0 :
2043 bond->params.updelay *
2044 bond->params.miimon);
2047 case BOND_LINK_BACK:
2049 bond_set_slave_link_state(slave,
2051 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2052 (bond->params.updelay - slave->delay) *
2053 bond->params.miimon,
2062 if (slave->delay <= 0) {
2063 slave->new_link = BOND_LINK_UP;
2065 ignore_updelay = false;
2077 static void bond_miimon_commit(struct bonding *bond)
2079 struct list_head *iter;
2080 struct slave *slave, *primary;
2082 bond_for_each_slave(bond, slave, iter) {
2083 switch (slave->new_link) {
2084 case BOND_LINK_NOCHANGE:
2088 bond_set_slave_link_state(slave, BOND_LINK_UP);
2089 slave->last_link_up = jiffies;
2091 primary = rtnl_dereference(bond->primary_slave);
2092 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2093 /* prevent it from being the active one */
2094 bond_set_backup_slave(slave);
2095 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2096 /* make it immediately active */
2097 bond_set_active_slave(slave);
2098 } else if (slave != primary) {
2099 /* prevent it from being the active one */
2100 bond_set_backup_slave(slave);
2103 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2105 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2106 slave->duplex ? "full" : "half");
2108 /* notify ad that the link status has changed */
2109 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2110 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2112 if (bond_is_lb(bond))
2113 bond_alb_handle_link_change(bond, slave,
2116 if (BOND_MODE(bond) == BOND_MODE_XOR)
2117 bond_update_slave_arr(bond, NULL);
2119 if (!bond->curr_active_slave || slave == primary)
2124 case BOND_LINK_DOWN:
2125 if (slave->link_failure_count < UINT_MAX)
2126 slave->link_failure_count++;
2128 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2130 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2131 BOND_MODE(bond) == BOND_MODE_8023AD)
2132 bond_set_slave_inactive_flags(slave,
2133 BOND_SLAVE_NOTIFY_NOW);
2135 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2138 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2139 bond_3ad_handle_link_change(slave,
2142 if (bond_is_lb(bond))
2143 bond_alb_handle_link_change(bond, slave,
2146 if (BOND_MODE(bond) == BOND_MODE_XOR)
2147 bond_update_slave_arr(bond, NULL);
2149 if (slave == rcu_access_pointer(bond->curr_active_slave))
2155 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2156 slave->new_link, slave->dev->name);
2157 slave->new_link = BOND_LINK_NOCHANGE;
2164 bond_select_active_slave(bond);
2165 unblock_netpoll_tx();
2168 bond_set_carrier(bond);
2173 * Really a wrapper that splits the mii monitor into two phases: an
2174 * inspection, then (if inspection indicates something needs to be done)
2175 * an acquisition of appropriate locks followed by a commit phase to
2176 * implement whatever link state changes are indicated.
2178 static void bond_mii_monitor(struct work_struct *work)
2180 struct bonding *bond = container_of(work, struct bonding,
2182 bool should_notify_peers = false;
2183 unsigned long delay;
2185 delay = msecs_to_jiffies(bond->params.miimon);
2187 if (!bond_has_slaves(bond))
2192 should_notify_peers = bond_should_notify_peers(bond);
2194 if (bond_miimon_inspect(bond)) {
2197 /* Race avoidance with bond_close cancel of workqueue */
2198 if (!rtnl_trylock()) {
2200 should_notify_peers = false;
2204 bond_miimon_commit(bond);
2206 rtnl_unlock(); /* might sleep, hold no other locks */
2211 if (bond->params.miimon)
2212 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2214 if (should_notify_peers) {
2215 if (!rtnl_trylock())
2217 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2222 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2224 struct net_device *upper;
2225 struct list_head *iter;
2228 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2232 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2233 if (ip == bond_confirm_addr(upper, 0, ip)) {
2243 /* We go to the (large) trouble of VLAN tagging ARP frames because
2244 * switches in VLAN mode (especially if ports are configured as
2245 * "native" to a VLAN) might not pass non-tagged frames.
2247 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2248 __be32 dest_ip, __be32 src_ip,
2249 struct bond_vlan_tag *tags)
2251 struct sk_buff *skb;
2252 struct bond_vlan_tag *outer_tag = tags;
2254 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2255 arp_op, slave_dev->name, &dest_ip, &src_ip);
2257 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2258 NULL, slave_dev->dev_addr, NULL);
2261 net_err_ratelimited("ARP packet allocation failed\n");
2265 if (!tags || tags->vlan_proto == VLAN_N_VID)
2270 /* Go through all the tags backwards and add them to the packet */
2271 while (tags->vlan_proto != VLAN_N_VID) {
2272 if (!tags->vlan_id) {
2277 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2278 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2279 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2282 net_err_ratelimited("failed to insert inner VLAN tag\n");
2288 /* Set the outer tag */
2289 if (outer_tag->vlan_id) {
2290 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2291 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2292 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2293 outer_tag->vlan_id);
2300 /* Validate the device path between the @start_dev and the @end_dev.
2301 * The path is valid if the @end_dev is reachable through device
2303 * When the path is validated, collect any vlan information in the
2306 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2307 struct net_device *end_dev,
2310 struct bond_vlan_tag *tags;
2311 struct net_device *upper;
2312 struct list_head *iter;
2314 if (start_dev == end_dev) {
2315 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2317 return ERR_PTR(-ENOMEM);
2318 tags[level].vlan_proto = VLAN_N_VID;
2322 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2323 tags = bond_verify_device_path(upper, end_dev, level + 1);
2324 if (IS_ERR_OR_NULL(tags)) {
2329 if (is_vlan_dev(upper)) {
2330 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2331 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2340 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2343 struct bond_vlan_tag *tags;
2344 __be32 *targets = bond->params.arp_targets, addr;
2347 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2348 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2351 /* Find out through which dev should the packet go */
2352 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2355 /* there's no route to target - try to send arp
2356 * probe to generate any traffic (arp_validate=0)
2358 if (bond->params.arp_validate)
2359 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2362 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2367 /* bond device itself */
2368 if (rt->dst.dev == bond->dev)
2372 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2375 if (!IS_ERR_OR_NULL(tags))
2378 /* Not our device - skip */
2379 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2380 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2386 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2388 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2394 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2398 if (!sip || !bond_has_this_ip(bond, tip)) {
2399 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2404 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2406 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2410 slave->last_rx = jiffies;
2411 slave->target_last_arp_rx[i] = jiffies;
2414 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2415 struct slave *slave)
2417 struct arphdr *arp = (struct arphdr *)skb->data;
2418 struct slave *curr_active_slave;
2419 unsigned char *arp_ptr;
2421 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2423 if (!slave_do_arp_validate(bond, slave)) {
2424 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2425 !slave_do_arp_validate_only(bond))
2426 slave->last_rx = jiffies;
2427 return RX_HANDLER_ANOTHER;
2428 } else if (!is_arp) {
2429 return RX_HANDLER_ANOTHER;
2432 alen = arp_hdr_len(bond->dev);
2434 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2437 if (alen > skb_headlen(skb)) {
2438 arp = kmalloc(alen, GFP_ATOMIC);
2441 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2445 if (arp->ar_hln != bond->dev->addr_len ||
2446 skb->pkt_type == PACKET_OTHERHOST ||
2447 skb->pkt_type == PACKET_LOOPBACK ||
2448 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2449 arp->ar_pro != htons(ETH_P_IP) ||
2453 arp_ptr = (unsigned char *)(arp + 1);
2454 arp_ptr += bond->dev->addr_len;
2455 memcpy(&sip, arp_ptr, 4);
2456 arp_ptr += 4 + bond->dev->addr_len;
2457 memcpy(&tip, arp_ptr, 4);
2459 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2460 slave->dev->name, bond_slave_state(slave),
2461 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2464 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2466 /* Backup slaves won't see the ARP reply, but do come through
2467 * here for each ARP probe (so we swap the sip/tip to validate
2468 * the probe). In a "redundant switch, common router" type of
2469 * configuration, the ARP probe will (hopefully) travel from
2470 * the active, through one switch, the router, then the other
2471 * switch before reaching the backup.
2473 * We 'trust' the arp requests if there is an active slave and
2474 * it received valid arp reply(s) after it became active. This
2475 * is done to avoid endless looping when we can't reach the
2476 * arp_ip_target and fool ourselves with our own arp requests.
2479 if (bond_is_active_slave(slave))
2480 bond_validate_arp(bond, slave, sip, tip);
2481 else if (curr_active_slave &&
2482 time_after(slave_last_rx(bond, curr_active_slave),
2483 curr_active_slave->last_link_up))
2484 bond_validate_arp(bond, slave, tip, sip);
2487 if (arp != (struct arphdr *)skb->data)
2489 return RX_HANDLER_ANOTHER;
2492 /* function to verify if we're in the arp_interval timeslice, returns true if
2493 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2494 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2496 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2499 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2501 return time_in_range(jiffies,
2502 last_act - delta_in_ticks,
2503 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2506 /* This function is called regularly to monitor each slave's link
2507 * ensuring that traffic is being sent and received when arp monitoring
2508 * is used in load-balancing mode. if the adapter has been dormant, then an
2509 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2510 * arp monitoring in active backup mode.
2512 static void bond_loadbalance_arp_mon(struct work_struct *work)
2514 struct bonding *bond = container_of(work, struct bonding,
2516 struct slave *slave, *oldcurrent;
2517 struct list_head *iter;
2518 int do_failover = 0, slave_state_changed = 0;
2520 if (!bond_has_slaves(bond))
2525 oldcurrent = rcu_dereference(bond->curr_active_slave);
2526 /* see if any of the previous devices are up now (i.e. they have
2527 * xmt and rcv traffic). the curr_active_slave does not come into
2528 * the picture unless it is null. also, slave->last_link_up is not
2529 * needed here because we send an arp on each slave and give a slave
2530 * as long as it needs to get the tx/rx within the delta.
2531 * TODO: what about up/down delay in arp mode? it wasn't here before
2534 bond_for_each_slave_rcu(bond, slave, iter) {
2535 unsigned long trans_start = dev_trans_start(slave->dev);
2537 if (slave->link != BOND_LINK_UP) {
2538 if (bond_time_in_interval(bond, trans_start, 1) &&
2539 bond_time_in_interval(bond, slave->last_rx, 1)) {
2541 slave->link = BOND_LINK_UP;
2542 slave_state_changed = 1;
2544 /* primary_slave has no meaning in round-robin
2545 * mode. the window of a slave being up and
2546 * curr_active_slave being null after enslaving
2550 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2554 netdev_info(bond->dev, "interface %s is now up\n",
2559 /* slave->link == BOND_LINK_UP */
2561 /* not all switches will respond to an arp request
2562 * when the source ip is 0, so don't take the link down
2563 * if we don't know our ip yet
2565 if (!bond_time_in_interval(bond, trans_start, 2) ||
2566 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2568 slave->link = BOND_LINK_DOWN;
2569 slave_state_changed = 1;
2571 if (slave->link_failure_count < UINT_MAX)
2572 slave->link_failure_count++;
2574 netdev_info(bond->dev, "interface %s is now down\n",
2577 if (slave == oldcurrent)
2582 /* note: if switch is in round-robin mode, all links
2583 * must tx arp to ensure all links rx an arp - otherwise
2584 * links may oscillate or not come up at all; if switch is
2585 * in something like xor mode, there is nothing we can
2586 * do - all replies will be rx'ed on same link causing slaves
2587 * to be unstable during low/no traffic periods
2589 if (bond_slave_is_up(slave))
2590 bond_arp_send_all(bond, slave);
2595 if (do_failover || slave_state_changed) {
2596 if (!rtnl_trylock())
2599 if (slave_state_changed) {
2600 bond_slave_state_change(bond);
2601 if (BOND_MODE(bond) == BOND_MODE_XOR)
2602 bond_update_slave_arr(bond, NULL);
2606 bond_select_active_slave(bond);
2607 unblock_netpoll_tx();
2613 if (bond->params.arp_interval)
2614 queue_delayed_work(bond->wq, &bond->arp_work,
2615 msecs_to_jiffies(bond->params.arp_interval));
2618 /* Called to inspect slaves for active-backup mode ARP monitor link state
2619 * changes. Sets new_link in slaves to specify what action should take
2620 * place for the slave. Returns 0 if no changes are found, >0 if changes
2621 * to link states must be committed.
2623 * Called with rcu_read_lock held.
2625 static int bond_ab_arp_inspect(struct bonding *bond)
2627 unsigned long trans_start, last_rx;
2628 struct list_head *iter;
2629 struct slave *slave;
2632 bond_for_each_slave_rcu(bond, slave, iter) {
2633 slave->new_link = BOND_LINK_NOCHANGE;
2634 last_rx = slave_last_rx(bond, slave);
2636 if (slave->link != BOND_LINK_UP) {
2637 if (bond_time_in_interval(bond, last_rx, 1)) {
2638 slave->new_link = BOND_LINK_UP;
2644 /* Give slaves 2*delta after being enslaved or made
2645 * active. This avoids bouncing, as the last receive
2646 * times need a full ARP monitor cycle to be updated.
2648 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2651 /* Backup slave is down if:
2652 * - No current_arp_slave AND
2653 * - more than 3*delta since last receive AND
2654 * - the bond has an IP address
2656 * Note: a non-null current_arp_slave indicates
2657 * the curr_active_slave went down and we are
2658 * searching for a new one; under this condition
2659 * we only take the curr_active_slave down - this
2660 * gives each slave a chance to tx/rx traffic
2661 * before being taken out
2663 if (!bond_is_active_slave(slave) &&
2664 !rcu_access_pointer(bond->current_arp_slave) &&
2665 !bond_time_in_interval(bond, last_rx, 3)) {
2666 slave->new_link = BOND_LINK_DOWN;
2670 /* Active slave is down if:
2671 * - more than 2*delta since transmitting OR
2672 * - (more than 2*delta since receive AND
2673 * the bond has an IP address)
2675 trans_start = dev_trans_start(slave->dev);
2676 if (bond_is_active_slave(slave) &&
2677 (!bond_time_in_interval(bond, trans_start, 2) ||
2678 !bond_time_in_interval(bond, last_rx, 2))) {
2679 slave->new_link = BOND_LINK_DOWN;
2687 /* Called to commit link state changes noted by inspection step of
2688 * active-backup mode ARP monitor.
2690 * Called with RTNL hold.
2692 static void bond_ab_arp_commit(struct bonding *bond)
2694 unsigned long trans_start;
2695 struct list_head *iter;
2696 struct slave *slave;
2698 bond_for_each_slave(bond, slave, iter) {
2699 switch (slave->new_link) {
2700 case BOND_LINK_NOCHANGE:
2704 trans_start = dev_trans_start(slave->dev);
2705 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2706 (!rtnl_dereference(bond->curr_active_slave) &&
2707 bond_time_in_interval(bond, trans_start, 1))) {
2708 struct slave *current_arp_slave;
2710 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2711 bond_set_slave_link_state(slave, BOND_LINK_UP);
2712 if (current_arp_slave) {
2713 bond_set_slave_inactive_flags(
2715 BOND_SLAVE_NOTIFY_NOW);
2716 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2719 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2722 if (!rtnl_dereference(bond->curr_active_slave) ||
2723 slave == rtnl_dereference(bond->primary_slave))
2730 case BOND_LINK_DOWN:
2731 if (slave->link_failure_count < UINT_MAX)
2732 slave->link_failure_count++;
2734 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2735 bond_set_slave_inactive_flags(slave,
2736 BOND_SLAVE_NOTIFY_NOW);
2738 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2741 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2742 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2749 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2750 slave->new_link, slave->dev->name);
2756 bond_select_active_slave(bond);
2757 unblock_netpoll_tx();
2760 bond_set_carrier(bond);
2763 /* Send ARP probes for active-backup mode ARP monitor.
2765 * Called with rcu_read_lock held.
2767 static bool bond_ab_arp_probe(struct bonding *bond)
2769 struct slave *slave, *before = NULL, *new_slave = NULL,
2770 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2771 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2772 struct list_head *iter;
2774 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2776 if (curr_arp_slave && curr_active_slave)
2777 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2778 curr_arp_slave->dev->name,
2779 curr_active_slave->dev->name);
2781 if (curr_active_slave) {
2782 bond_arp_send_all(bond, curr_active_slave);
2783 return should_notify_rtnl;
2786 /* if we don't have a curr_active_slave, search for the next available
2787 * backup slave from the current_arp_slave and make it the candidate
2788 * for becoming the curr_active_slave
2791 if (!curr_arp_slave) {
2792 curr_arp_slave = bond_first_slave_rcu(bond);
2793 if (!curr_arp_slave)
2794 return should_notify_rtnl;
2797 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2799 bond_for_each_slave_rcu(bond, slave, iter) {
2800 if (!found && !before && bond_slave_is_up(slave))
2803 if (found && !new_slave && bond_slave_is_up(slave))
2805 /* if the link state is up at this point, we
2806 * mark it down - this can happen if we have
2807 * simultaneous link failures and
2808 * reselect_active_interface doesn't make this
2809 * one the current slave so it is still marked
2810 * up when it is actually down
2812 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2813 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2814 if (slave->link_failure_count < UINT_MAX)
2815 slave->link_failure_count++;
2817 bond_set_slave_inactive_flags(slave,
2818 BOND_SLAVE_NOTIFY_LATER);
2820 netdev_info(bond->dev, "backup interface %s is now down\n",
2823 if (slave == curr_arp_slave)
2827 if (!new_slave && before)
2833 bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2834 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2835 bond_arp_send_all(bond, new_slave);
2836 new_slave->last_link_up = jiffies;
2837 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2840 bond_for_each_slave_rcu(bond, slave, iter) {
2841 if (slave->should_notify) {
2842 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2846 return should_notify_rtnl;
2849 static void bond_activebackup_arp_mon(struct work_struct *work)
2851 struct bonding *bond = container_of(work, struct bonding,
2853 bool should_notify_peers = false;
2854 bool should_notify_rtnl = false;
2857 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2859 if (!bond_has_slaves(bond))
2864 should_notify_peers = bond_should_notify_peers(bond);
2866 if (bond_ab_arp_inspect(bond)) {
2869 /* Race avoidance with bond_close flush of workqueue */
2870 if (!rtnl_trylock()) {
2872 should_notify_peers = false;
2876 bond_ab_arp_commit(bond);
2882 should_notify_rtnl = bond_ab_arp_probe(bond);
2886 if (bond->params.arp_interval)
2887 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2889 if (should_notify_peers || should_notify_rtnl) {
2890 if (!rtnl_trylock())
2893 if (should_notify_peers)
2894 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2896 if (should_notify_rtnl)
2897 bond_slave_state_notify(bond);
2903 /*-------------------------- netdev event handling --------------------------*/
2905 /* Change device name */
2906 static int bond_event_changename(struct bonding *bond)
2908 bond_remove_proc_entry(bond);
2909 bond_create_proc_entry(bond);
2911 bond_debug_reregister(bond);
2916 static int bond_master_netdev_event(unsigned long event,
2917 struct net_device *bond_dev)
2919 struct bonding *event_bond = netdev_priv(bond_dev);
2922 case NETDEV_CHANGENAME:
2923 return bond_event_changename(event_bond);
2924 case NETDEV_UNREGISTER:
2925 bond_remove_proc_entry(event_bond);
2927 case NETDEV_REGISTER:
2928 bond_create_proc_entry(event_bond);
2930 case NETDEV_NOTIFY_PEERS:
2931 if (event_bond->send_peer_notif)
2932 event_bond->send_peer_notif--;
2941 static int bond_slave_netdev_event(unsigned long event,
2942 struct net_device *slave_dev)
2944 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2945 struct bonding *bond;
2946 struct net_device *bond_dev;
2950 /* A netdev event can be generated while enslaving a device
2951 * before netdev_rx_handler_register is called in which case
2952 * slave will be NULL
2956 bond_dev = slave->bond->dev;
2958 primary = rtnl_dereference(bond->primary_slave);
2961 case NETDEV_UNREGISTER:
2962 if (bond_dev->type != ARPHRD_ETHER)
2963 bond_release_and_destroy(bond_dev, slave_dev);
2965 bond_release(bond_dev, slave_dev);
2969 old_speed = slave->speed;
2970 old_duplex = slave->duplex;
2972 bond_update_speed_duplex(slave);
2974 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2975 if (old_speed != slave->speed)
2976 bond_3ad_adapter_speed_changed(slave);
2977 if (old_duplex != slave->duplex)
2978 bond_3ad_adapter_duplex_changed(slave);
2982 /* Refresh slave-array if applicable!
2983 * If the setup does not use miimon or arpmon (mode-specific!),
2984 * then these events will not cause the slave-array to be
2985 * refreshed. This will cause xmit to use a slave that is not
2986 * usable. Avoid such situation by refeshing the array at these
2987 * events. If these (miimon/arpmon) parameters are configured
2988 * then array gets refreshed twice and that should be fine!
2990 if (bond_mode_uses_xmit_hash(bond))
2991 bond_update_slave_arr(bond, NULL);
2993 case NETDEV_CHANGEMTU:
2994 /* TODO: Should slaves be allowed to
2995 * independently alter their MTU? For
2996 * an active-backup bond, slaves need
2997 * not be the same type of device, so
2998 * MTUs may vary. For other modes,
2999 * slaves arguably should have the
3000 * same MTUs. To do this, we'd need to
3001 * take over the slave's change_mtu
3002 * function for the duration of their
3006 case NETDEV_CHANGENAME:
3007 /* we don't care if we don't have primary set */
3008 if (!bond_uses_primary(bond) ||
3009 !bond->params.primary[0])
3012 if (slave == primary) {
3013 /* slave's name changed - he's no longer primary */
3014 RCU_INIT_POINTER(bond->primary_slave, NULL);
3015 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3016 /* we have a new primary slave */
3017 rcu_assign_pointer(bond->primary_slave, slave);
3018 } else { /* we didn't change primary - exit */
3022 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3023 primary ? slave_dev->name : "none");
3026 bond_select_active_slave(bond);
3027 unblock_netpoll_tx();
3029 case NETDEV_FEAT_CHANGE:
3030 bond_compute_features(bond);
3032 case NETDEV_RESEND_IGMP:
3033 /* Propagate to master device */
3034 call_netdevice_notifiers(event, slave->bond->dev);
3043 /* bond_netdev_event: handle netdev notifier chain events.
3045 * This function receives events for the netdev chain. The caller (an
3046 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3047 * locks for us to safely manipulate the slave devices (RTNL lock,
3050 static int bond_netdev_event(struct notifier_block *this,
3051 unsigned long event, void *ptr)
3053 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3055 netdev_dbg(event_dev, "event: %lx\n", event);
3057 if (!(event_dev->priv_flags & IFF_BONDING))
3060 if (event_dev->flags & IFF_MASTER) {
3061 netdev_dbg(event_dev, "IFF_MASTER\n");
3062 return bond_master_netdev_event(event, event_dev);
3065 if (event_dev->flags & IFF_SLAVE) {
3066 netdev_dbg(event_dev, "IFF_SLAVE\n");
3067 return bond_slave_netdev_event(event, event_dev);
3073 static struct notifier_block bond_netdev_notifier = {
3074 .notifier_call = bond_netdev_event,
3077 /*---------------------------- Hashing Policies -----------------------------*/
3079 /* L2 hash helper */
3080 static inline u32 bond_eth_hash(struct sk_buff *skb)
3082 struct ethhdr *ep, hdr_tmp;
3084 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3086 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3090 /* Extract the appropriate headers based on bond's xmit policy */
3091 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3092 struct flow_keys *fk)
3094 const struct ipv6hdr *iph6;
3095 const struct iphdr *iph;
3096 int noff, proto = -1;
3098 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3099 return skb_flow_dissect_flow_keys(skb, fk);
3101 fk->ports.ports = 0;
3102 noff = skb_network_offset(skb);
3103 if (skb->protocol == htons(ETH_P_IP)) {
3104 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3107 iph_to_flow_copy_v4addrs(fk, iph);
3108 noff += iph->ihl << 2;
3109 if (!ip_is_fragment(iph))
3110 proto = iph->protocol;
3111 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3112 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3114 iph6 = ipv6_hdr(skb);
3115 iph_to_flow_copy_v6addrs(fk, iph6);
3116 noff += sizeof(*iph6);
3117 proto = iph6->nexthdr;
3121 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3122 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3128 * bond_xmit_hash - generate a hash value based on the xmit policy
3129 * @bond: bonding device
3130 * @skb: buffer to use for headers
3132 * This function will extract the necessary headers from the skb buffer and use
3133 * them to generate a hash based on the xmit_policy set in the bonding device
3135 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3137 struct flow_keys flow;
3140 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3141 !bond_flow_dissect(bond, skb, &flow))
3142 return bond_eth_hash(skb);
3144 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3145 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3146 hash = bond_eth_hash(skb);
3148 hash = (__force u32)flow.ports.ports;
3149 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3150 (__force u32)flow_get_u32_src(&flow);
3151 hash ^= (hash >> 16);
3152 hash ^= (hash >> 8);
3157 /*-------------------------- Device entry points ----------------------------*/
3159 static void bond_work_init_all(struct bonding *bond)
3161 INIT_DELAYED_WORK(&bond->mcast_work,
3162 bond_resend_igmp_join_requests_delayed);
3163 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3164 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3165 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3166 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3168 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3169 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3170 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3173 static void bond_work_cancel_all(struct bonding *bond)
3175 cancel_delayed_work_sync(&bond->mii_work);
3176 cancel_delayed_work_sync(&bond->arp_work);
3177 cancel_delayed_work_sync(&bond->alb_work);
3178 cancel_delayed_work_sync(&bond->ad_work);
3179 cancel_delayed_work_sync(&bond->mcast_work);
3180 cancel_delayed_work_sync(&bond->slave_arr_work);
3183 static int bond_open(struct net_device *bond_dev)
3185 struct bonding *bond = netdev_priv(bond_dev);
3186 struct list_head *iter;
3187 struct slave *slave;
3189 /* reset slave->backup and slave->inactive */
3190 if (bond_has_slaves(bond)) {
3191 bond_for_each_slave(bond, slave, iter) {
3192 if (bond_uses_primary(bond) &&
3193 slave != rcu_access_pointer(bond->curr_active_slave)) {
3194 bond_set_slave_inactive_flags(slave,
3195 BOND_SLAVE_NOTIFY_NOW);
3196 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3197 bond_set_slave_active_flags(slave,
3198 BOND_SLAVE_NOTIFY_NOW);
3203 bond_work_init_all(bond);
3205 if (bond_is_lb(bond)) {
3206 /* bond_alb_initialize must be called before the timer
3209 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3211 if (bond->params.tlb_dynamic_lb)
3212 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3215 if (bond->params.miimon) /* link check interval, in milliseconds. */
3216 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3218 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3219 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3220 bond->recv_probe = bond_arp_rcv;
3223 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3224 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3225 /* register to receive LACPDUs */
3226 bond->recv_probe = bond_3ad_lacpdu_recv;
3227 bond_3ad_initiate_agg_selection(bond, 1);
3230 if (bond_mode_uses_xmit_hash(bond))
3231 bond_update_slave_arr(bond, NULL);
3236 static int bond_close(struct net_device *bond_dev)
3238 struct bonding *bond = netdev_priv(bond_dev);
3240 bond_work_cancel_all(bond);
3241 bond->send_peer_notif = 0;
3242 if (bond_is_lb(bond))
3243 bond_alb_deinitialize(bond);
3244 bond->recv_probe = NULL;
3249 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3250 struct rtnl_link_stats64 *stats)
3252 struct bonding *bond = netdev_priv(bond_dev);
3253 struct rtnl_link_stats64 temp;
3254 struct list_head *iter;
3255 struct slave *slave;
3257 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3259 bond_for_each_slave(bond, slave, iter) {
3260 const struct rtnl_link_stats64 *sstats =
3261 dev_get_stats(slave->dev, &temp);
3262 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3264 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3265 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3266 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3267 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3269 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3270 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3271 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3272 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3274 stats->multicast += sstats->multicast - pstats->multicast;
3275 stats->collisions += sstats->collisions - pstats->collisions;
3277 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3278 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3279 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3280 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3281 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3282 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3284 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3285 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3286 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3287 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3288 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3290 /* save off the slave stats for the next run */
3291 memcpy(pstats, sstats, sizeof(*sstats));
3293 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3298 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3300 struct bonding *bond = netdev_priv(bond_dev);
3301 struct net_device *slave_dev = NULL;
3302 struct ifbond k_binfo;
3303 struct ifbond __user *u_binfo = NULL;
3304 struct ifslave k_sinfo;
3305 struct ifslave __user *u_sinfo = NULL;
3306 struct mii_ioctl_data *mii = NULL;
3307 struct bond_opt_value newval;
3311 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3322 /* We do this again just in case we were called by SIOCGMIIREG
3323 * instead of SIOCGMIIPHY.
3329 if (mii->reg_num == 1) {
3331 if (netif_carrier_ok(bond->dev))
3332 mii->val_out = BMSR_LSTATUS;
3336 case BOND_INFO_QUERY_OLD:
3337 case SIOCBONDINFOQUERY:
3338 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3340 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3343 res = bond_info_query(bond_dev, &k_binfo);
3345 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3349 case BOND_SLAVE_INFO_QUERY_OLD:
3350 case SIOCBONDSLAVEINFOQUERY:
3351 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3353 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3356 res = bond_slave_info_query(bond_dev, &k_sinfo);
3358 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3366 net = dev_net(bond_dev);
3368 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3371 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3373 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3378 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3380 case BOND_ENSLAVE_OLD:
3381 case SIOCBONDENSLAVE:
3382 res = bond_enslave(bond_dev, slave_dev);
3384 case BOND_RELEASE_OLD:
3385 case SIOCBONDRELEASE:
3386 res = bond_release(bond_dev, slave_dev);
3388 case BOND_SETHWADDR_OLD:
3389 case SIOCBONDSETHWADDR:
3390 bond_set_dev_addr(bond_dev, slave_dev);
3393 case BOND_CHANGE_ACTIVE_OLD:
3394 case SIOCBONDCHANGEACTIVE:
3395 bond_opt_initstr(&newval, slave_dev->name);
3396 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3405 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3407 struct bonding *bond = netdev_priv(bond_dev);
3409 if (change & IFF_PROMISC)
3410 bond_set_promiscuity(bond,
3411 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3413 if (change & IFF_ALLMULTI)
3414 bond_set_allmulti(bond,
3415 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3418 static void bond_set_rx_mode(struct net_device *bond_dev)
3420 struct bonding *bond = netdev_priv(bond_dev);
3421 struct list_head *iter;
3422 struct slave *slave;
3425 if (bond_uses_primary(bond)) {
3426 slave = rcu_dereference(bond->curr_active_slave);
3428 dev_uc_sync(slave->dev, bond_dev);
3429 dev_mc_sync(slave->dev, bond_dev);
3432 bond_for_each_slave_rcu(bond, slave, iter) {
3433 dev_uc_sync_multiple(slave->dev, bond_dev);
3434 dev_mc_sync_multiple(slave->dev, bond_dev);
3440 static int bond_neigh_init(struct neighbour *n)
3442 struct bonding *bond = netdev_priv(n->dev);
3443 const struct net_device_ops *slave_ops;
3444 struct neigh_parms parms;
3445 struct slave *slave;
3448 slave = bond_first_slave(bond);
3451 slave_ops = slave->dev->netdev_ops;
3452 if (!slave_ops->ndo_neigh_setup)
3455 parms.neigh_setup = NULL;
3456 parms.neigh_cleanup = NULL;
3457 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3461 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3462 * after the last slave has been detached. Assumes that all slaves
3463 * utilize the same neigh_cleanup (true at this writing as only user
3466 n->parms->neigh_cleanup = parms.neigh_cleanup;
3468 if (!parms.neigh_setup)
3471 return parms.neigh_setup(n);
3474 /* The bonding ndo_neigh_setup is called at init time beofre any
3475 * slave exists. So we must declare proxy setup function which will
3476 * be used at run time to resolve the actual slave neigh param setup.
3478 * It's also called by master devices (such as vlans) to setup their
3479 * underlying devices. In that case - do nothing, we're already set up from
3482 static int bond_neigh_setup(struct net_device *dev,
3483 struct neigh_parms *parms)
3485 /* modify only our neigh_parms */
3486 if (parms->dev == dev)
3487 parms->neigh_setup = bond_neigh_init;
3492 /* Change the MTU of all of a master's slaves to match the master */
3493 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3495 struct bonding *bond = netdev_priv(bond_dev);
3496 struct slave *slave, *rollback_slave;
3497 struct list_head *iter;
3500 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3502 bond_for_each_slave(bond, slave, iter) {
3503 netdev_dbg(bond_dev, "s %p c_m %p\n",
3504 slave, slave->dev->netdev_ops->ndo_change_mtu);
3506 res = dev_set_mtu(slave->dev, new_mtu);
3509 /* If we failed to set the slave's mtu to the new value
3510 * we must abort the operation even in ACTIVE_BACKUP
3511 * mode, because if we allow the backup slaves to have
3512 * different mtu values than the active slave we'll
3513 * need to change their mtu when doing a failover. That
3514 * means changing their mtu from timer context, which
3515 * is probably not a good idea.
3517 netdev_dbg(bond_dev, "err %d %s\n", res,
3523 bond_dev->mtu = new_mtu;
3528 /* unwind from head to the slave that failed */
3529 bond_for_each_slave(bond, rollback_slave, iter) {
3532 if (rollback_slave == slave)
3535 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3537 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3538 tmp_res, rollback_slave->dev->name);
3545 /* Change HW address
3547 * Note that many devices must be down to change the HW address, and
3548 * downing the master releases all slaves. We can make bonds full of
3549 * bonding devices to test this, however.
3551 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3553 struct bonding *bond = netdev_priv(bond_dev);
3554 struct slave *slave, *rollback_slave;
3555 struct sockaddr *sa = addr, tmp_sa;
3556 struct list_head *iter;
3559 if (BOND_MODE(bond) == BOND_MODE_ALB)
3560 return bond_alb_set_mac_address(bond_dev, addr);
3563 netdev_dbg(bond_dev, "bond=%p\n", bond);
3565 /* If fail_over_mac is enabled, do nothing and return success.
3566 * Returning an error causes ifenslave to fail.
3568 if (bond->params.fail_over_mac &&
3569 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3572 if (!is_valid_ether_addr(sa->sa_data))
3573 return -EADDRNOTAVAIL;
3575 bond_for_each_slave(bond, slave, iter) {
3576 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3577 res = dev_set_mac_address(slave->dev, addr);
3579 /* TODO: consider downing the slave
3581 * User should expect communications
3582 * breakage anyway until ARP finish
3585 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3591 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3595 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3596 tmp_sa.sa_family = bond_dev->type;
3598 /* unwind from head to the slave that failed */
3599 bond_for_each_slave(bond, rollback_slave, iter) {
3602 if (rollback_slave == slave)
3605 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3607 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3608 tmp_res, rollback_slave->dev->name);
3616 * bond_xmit_slave_id - transmit skb through slave with slave_id
3617 * @bond: bonding device that is transmitting
3618 * @skb: buffer to transmit
3619 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3621 * This function tries to transmit through slave with slave_id but in case
3622 * it fails, it tries to find the first available slave for transmission.
3623 * The skb is consumed in all cases, thus the function is void.
3625 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3627 struct list_head *iter;
3628 struct slave *slave;
3631 /* Here we start from the slave with slave_id */
3632 bond_for_each_slave_rcu(bond, slave, iter) {
3634 if (bond_slave_can_tx(slave)) {
3635 bond_dev_queue_xmit(bond, skb, slave->dev);
3641 /* Here we start from the first slave up to slave_id */
3643 bond_for_each_slave_rcu(bond, slave, iter) {
3646 if (bond_slave_can_tx(slave)) {
3647 bond_dev_queue_xmit(bond, skb, slave->dev);
3651 /* no slave that can tx has been found */
3652 bond_tx_drop(bond->dev, skb);
3656 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3657 * @bond: bonding device to use
3659 * Based on the value of the bonding device's packets_per_slave parameter
3660 * this function generates a slave id, which is usually used as the next
3661 * slave to transmit through.
3663 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3666 struct reciprocal_value reciprocal_packets_per_slave;
3667 int packets_per_slave = bond->params.packets_per_slave;
3669 switch (packets_per_slave) {
3671 slave_id = prandom_u32();
3674 slave_id = bond->rr_tx_counter;
3677 reciprocal_packets_per_slave =
3678 bond->params.reciprocal_packets_per_slave;
3679 slave_id = reciprocal_divide(bond->rr_tx_counter,
3680 reciprocal_packets_per_slave);
3683 bond->rr_tx_counter++;
3688 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3690 struct bonding *bond = netdev_priv(bond_dev);
3691 struct iphdr *iph = ip_hdr(skb);
3692 struct slave *slave;
3695 /* Start with the curr_active_slave that joined the bond as the
3696 * default for sending IGMP traffic. For failover purposes one
3697 * needs to maintain some consistency for the interface that will
3698 * send the join/membership reports. The curr_active_slave found
3699 * will send all of this type of traffic.
3701 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3702 slave = rcu_dereference(bond->curr_active_slave);
3704 bond_dev_queue_xmit(bond, skb, slave->dev);
3706 bond_xmit_slave_id(bond, skb, 0);
3708 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3710 if (likely(slave_cnt)) {
3711 slave_id = bond_rr_gen_slave_id(bond);
3712 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3714 bond_tx_drop(bond_dev, skb);
3718 return NETDEV_TX_OK;
3721 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3722 * the bond has a usable interface.
3724 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3726 struct bonding *bond = netdev_priv(bond_dev);
3727 struct slave *slave;
3729 slave = rcu_dereference(bond->curr_active_slave);
3731 bond_dev_queue_xmit(bond, skb, slave->dev);
3733 bond_tx_drop(bond_dev, skb);
3735 return NETDEV_TX_OK;
3738 /* Use this to update slave_array when (a) it's not appropriate to update
3739 * slave_array right away (note that update_slave_array() may sleep)
3740 * and / or (b) RTNL is not held.
3742 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3744 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3747 /* Slave array work handler. Holds only RTNL */
3748 static void bond_slave_arr_handler(struct work_struct *work)
3750 struct bonding *bond = container_of(work, struct bonding,
3751 slave_arr_work.work);
3754 if (!rtnl_trylock())
3757 ret = bond_update_slave_arr(bond, NULL);
3760 pr_warn_ratelimited("Failed to update slave array from WT\n");
3766 bond_slave_arr_work_rearm(bond, 1);
3769 /* Build the usable slaves array in control path for modes that use xmit-hash
3770 * to determine the slave interface -
3771 * (a) BOND_MODE_8023AD
3773 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3775 * The caller is expected to hold RTNL only and NO other lock!
3777 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3779 struct slave *slave;
3780 struct list_head *iter;
3781 struct bond_up_slave *new_arr, *old_arr;
3786 #ifdef CONFIG_LOCKDEP
3787 WARN_ON(lockdep_is_held(&bond->mode_lock));
3790 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3794 pr_err("Failed to build slave-array.\n");
3797 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3798 struct ad_info ad_info;
3800 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3801 pr_debug("bond_3ad_get_active_agg_info failed\n");
3802 kfree_rcu(new_arr, rcu);
3803 /* No active aggragator means it's not safe to use
3804 * the previous array.
3806 old_arr = rtnl_dereference(bond->slave_arr);
3808 RCU_INIT_POINTER(bond->slave_arr, NULL);
3809 kfree_rcu(old_arr, rcu);
3813 slaves_in_agg = ad_info.ports;
3814 agg_id = ad_info.aggregator_id;
3816 bond_for_each_slave(bond, slave, iter) {
3817 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3818 struct aggregator *agg;
3820 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3821 if (!agg || agg->aggregator_identifier != agg_id)
3824 if (!bond_slave_can_tx(slave))
3826 if (skipslave == slave)
3828 new_arr->arr[new_arr->count++] = slave;
3831 old_arr = rtnl_dereference(bond->slave_arr);
3832 rcu_assign_pointer(bond->slave_arr, new_arr);
3834 kfree_rcu(old_arr, rcu);
3836 if (ret != 0 && skipslave) {
3839 /* Rare situation where caller has asked to skip a specific
3840 * slave but allocation failed (most likely!). BTW this is
3841 * only possible when the call is initiated from
3842 * __bond_release_one(). In this situation; overwrite the
3843 * skipslave entry in the array with the last entry from the
3844 * array to avoid a situation where the xmit path may choose
3845 * this to-be-skipped slave to send a packet out.
3847 old_arr = rtnl_dereference(bond->slave_arr);
3848 for (idx = 0; idx < old_arr->count; idx++) {
3849 if (skipslave == old_arr->arr[idx]) {
3851 old_arr->arr[old_arr->count-1];
3860 /* Use this Xmit function for 3AD as well as XOR modes. The current
3861 * usable slave array is formed in the control path. The xmit function
3862 * just calculates hash and sends the packet out.
3864 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3866 struct bonding *bond = netdev_priv(dev);
3867 struct slave *slave;
3868 struct bond_up_slave *slaves;
3871 slaves = rcu_dereference(bond->slave_arr);
3872 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3873 if (likely(count)) {
3874 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3875 bond_dev_queue_xmit(bond, skb, slave->dev);
3877 bond_tx_drop(dev, skb);
3880 return NETDEV_TX_OK;
3883 /* in broadcast mode, we send everything to all usable interfaces. */
3884 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3886 struct bonding *bond = netdev_priv(bond_dev);
3887 struct slave *slave = NULL;
3888 struct list_head *iter;
3890 bond_for_each_slave_rcu(bond, slave, iter) {
3891 if (bond_is_last_slave(bond, slave))
3893 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3894 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3897 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3898 bond_dev->name, __func__);
3901 bond_dev_queue_xmit(bond, skb2, slave->dev);
3904 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3905 bond_dev_queue_xmit(bond, skb, slave->dev);
3907 bond_tx_drop(bond_dev, skb);
3909 return NETDEV_TX_OK;
3912 /*------------------------- Device initialization ---------------------------*/
3914 /* Lookup the slave that corresponds to a qid */
3915 static inline int bond_slave_override(struct bonding *bond,
3916 struct sk_buff *skb)
3918 struct slave *slave = NULL;
3919 struct list_head *iter;
3921 if (!skb->queue_mapping)
3924 /* Find out if any slaves have the same mapping as this skb. */
3925 bond_for_each_slave_rcu(bond, slave, iter) {
3926 if (slave->queue_id == skb->queue_mapping) {
3927 if (bond_slave_is_up(slave) &&
3928 slave->link == BOND_LINK_UP) {
3929 bond_dev_queue_xmit(bond, skb, slave->dev);
3932 /* If the slave isn't UP, use default transmit policy. */
3941 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3942 void *accel_priv, select_queue_fallback_t fallback)
3944 /* This helper function exists to help dev_pick_tx get the correct
3945 * destination queue. Using a helper function skips a call to
3946 * skb_tx_hash and will put the skbs in the queue we expect on their
3947 * way down to the bonding driver.
3949 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3951 /* Save the original txq to restore before passing to the driver */
3952 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3954 if (unlikely(txq >= dev->real_num_tx_queues)) {
3956 txq -= dev->real_num_tx_queues;
3957 } while (txq >= dev->real_num_tx_queues);
3962 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3964 struct bonding *bond = netdev_priv(dev);
3966 if (bond_should_override_tx_queue(bond) &&
3967 !bond_slave_override(bond, skb))
3968 return NETDEV_TX_OK;
3970 switch (BOND_MODE(bond)) {
3971 case BOND_MODE_ROUNDROBIN:
3972 return bond_xmit_roundrobin(skb, dev);
3973 case BOND_MODE_ACTIVEBACKUP:
3974 return bond_xmit_activebackup(skb, dev);
3975 case BOND_MODE_8023AD:
3977 return bond_3ad_xor_xmit(skb, dev);
3978 case BOND_MODE_BROADCAST:
3979 return bond_xmit_broadcast(skb, dev);
3981 return bond_alb_xmit(skb, dev);
3983 return bond_tlb_xmit(skb, dev);
3985 /* Should never happen, mode already checked */
3986 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3988 bond_tx_drop(dev, skb);
3989 return NETDEV_TX_OK;
3993 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3995 struct bonding *bond = netdev_priv(dev);
3996 netdev_tx_t ret = NETDEV_TX_OK;
3998 /* If we risk deadlock from transmitting this in the
3999 * netpoll path, tell netpoll to queue the frame for later tx
4001 if (unlikely(is_netpoll_tx_blocked(dev)))
4002 return NETDEV_TX_BUSY;
4005 if (bond_has_slaves(bond))
4006 ret = __bond_start_xmit(skb, dev);
4008 bond_tx_drop(dev, skb);
4014 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4015 struct ethtool_cmd *ecmd)
4017 struct bonding *bond = netdev_priv(bond_dev);
4018 unsigned long speed = 0;
4019 struct list_head *iter;
4020 struct slave *slave;
4022 ecmd->duplex = DUPLEX_UNKNOWN;
4023 ecmd->port = PORT_OTHER;
4025 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4026 * do not need to check mode. Though link speed might not represent
4027 * the true receive or transmit bandwidth (not all modes are symmetric)
4028 * this is an accurate maximum.
4030 bond_for_each_slave(bond, slave, iter) {
4031 if (bond_slave_can_tx(slave)) {
4032 if (slave->speed != SPEED_UNKNOWN)
4033 speed += slave->speed;
4034 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4035 slave->duplex != DUPLEX_UNKNOWN)
4036 ecmd->duplex = slave->duplex;
4039 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4044 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4045 struct ethtool_drvinfo *drvinfo)
4047 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4048 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4049 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4053 static const struct ethtool_ops bond_ethtool_ops = {
4054 .get_drvinfo = bond_ethtool_get_drvinfo,
4055 .get_settings = bond_ethtool_get_settings,
4056 .get_link = ethtool_op_get_link,
4059 static const struct net_device_ops bond_netdev_ops = {
4060 .ndo_init = bond_init,
4061 .ndo_uninit = bond_uninit,
4062 .ndo_open = bond_open,
4063 .ndo_stop = bond_close,
4064 .ndo_start_xmit = bond_start_xmit,
4065 .ndo_select_queue = bond_select_queue,
4066 .ndo_get_stats64 = bond_get_stats,
4067 .ndo_do_ioctl = bond_do_ioctl,
4068 .ndo_change_rx_flags = bond_change_rx_flags,
4069 .ndo_set_rx_mode = bond_set_rx_mode,
4070 .ndo_change_mtu = bond_change_mtu,
4071 .ndo_set_mac_address = bond_set_mac_address,
4072 .ndo_neigh_setup = bond_neigh_setup,
4073 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4074 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4075 #ifdef CONFIG_NET_POLL_CONTROLLER
4076 .ndo_netpoll_setup = bond_netpoll_setup,
4077 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4078 .ndo_poll_controller = bond_poll_controller,
4080 .ndo_add_slave = bond_enslave,
4081 .ndo_del_slave = bond_release,
4082 .ndo_fix_features = bond_fix_features,
4083 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4084 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4085 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4086 .ndo_fdb_add = switchdev_port_fdb_add,
4087 .ndo_fdb_del = switchdev_port_fdb_del,
4088 .ndo_fdb_dump = switchdev_port_fdb_dump,
4089 .ndo_features_check = passthru_features_check,
4092 static const struct device_type bond_type = {
4096 static void bond_destructor(struct net_device *bond_dev)
4098 struct bonding *bond = netdev_priv(bond_dev);
4100 destroy_workqueue(bond->wq);
4101 free_netdev(bond_dev);
4104 void bond_setup(struct net_device *bond_dev)
4106 struct bonding *bond = netdev_priv(bond_dev);
4108 spin_lock_init(&bond->mode_lock);
4109 bond->params = bonding_defaults;
4111 /* Initialize pointers */
4112 bond->dev = bond_dev;
4114 /* Initialize the device entry points */
4115 ether_setup(bond_dev);
4116 bond_dev->netdev_ops = &bond_netdev_ops;
4117 bond_dev->ethtool_ops = &bond_ethtool_ops;
4119 bond_dev->destructor = bond_destructor;
4121 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4123 /* Initialize the device options */
4124 bond_dev->tx_queue_len = 0;
4125 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4126 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
4127 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4129 /* don't acquire bond device's netif_tx_lock when transmitting */
4130 bond_dev->features |= NETIF_F_LLTX;
4132 /* By default, we declare the bond to be fully
4133 * VLAN hardware accelerated capable. Special
4134 * care is taken in the various xmit functions
4135 * when there are slaves that are not hw accel
4139 /* Don't allow bond devices to change network namespaces. */
4140 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4142 bond_dev->hw_features = BOND_VLAN_FEATURES |
4143 NETIF_F_HW_VLAN_CTAG_TX |
4144 NETIF_F_HW_VLAN_CTAG_RX |
4145 NETIF_F_HW_VLAN_CTAG_FILTER;
4147 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4148 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4149 bond_dev->features |= bond_dev->hw_features;
4152 /* Destroy a bonding device.
4153 * Must be under rtnl_lock when this function is called.
4155 static void bond_uninit(struct net_device *bond_dev)
4157 struct bonding *bond = netdev_priv(bond_dev);
4158 struct list_head *iter;
4159 struct slave *slave;
4160 struct bond_up_slave *arr;
4162 bond_netpoll_cleanup(bond_dev);
4164 /* Release the bonded slaves */
4165 bond_for_each_slave(bond, slave, iter)
4166 __bond_release_one(bond_dev, slave->dev, true);
4167 netdev_info(bond_dev, "Released all slaves\n");
4169 arr = rtnl_dereference(bond->slave_arr);
4171 RCU_INIT_POINTER(bond->slave_arr, NULL);
4172 kfree_rcu(arr, rcu);
4175 list_del(&bond->bond_list);
4177 bond_debug_unregister(bond);
4180 /*------------------------- Module initialization ---------------------------*/
4182 static int bond_check_params(struct bond_params *params)
4184 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4185 struct bond_opt_value newval;
4186 const struct bond_opt_value *valptr;
4187 int arp_all_targets_value;
4188 u16 ad_actor_sys_prio = 0;
4189 u16 ad_user_port_key = 0;
4191 /* Convert string parameters. */
4193 bond_opt_initstr(&newval, mode);
4194 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4196 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4199 bond_mode = valptr->value;
4202 if (xmit_hash_policy) {
4203 if ((bond_mode != BOND_MODE_XOR) &&
4204 (bond_mode != BOND_MODE_8023AD) &&
4205 (bond_mode != BOND_MODE_TLB)) {
4206 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4207 bond_mode_name(bond_mode));
4209 bond_opt_initstr(&newval, xmit_hash_policy);
4210 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4213 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4217 xmit_hashtype = valptr->value;
4222 if (bond_mode != BOND_MODE_8023AD) {
4223 pr_info("lacp_rate param is irrelevant in mode %s\n",
4224 bond_mode_name(bond_mode));
4226 bond_opt_initstr(&newval, lacp_rate);
4227 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4230 pr_err("Error: Invalid lacp rate \"%s\"\n",
4234 lacp_fast = valptr->value;
4239 bond_opt_initstr(&newval, ad_select);
4240 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4243 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4246 params->ad_select = valptr->value;
4247 if (bond_mode != BOND_MODE_8023AD)
4248 pr_warn("ad_select param only affects 802.3ad mode\n");
4250 params->ad_select = BOND_AD_STABLE;
4253 if (max_bonds < 0) {
4254 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4255 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4256 max_bonds = BOND_DEFAULT_MAX_BONDS;
4260 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4266 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4271 if (downdelay < 0) {
4272 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4273 downdelay, INT_MAX);
4277 if ((use_carrier != 0) && (use_carrier != 1)) {
4278 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4283 if (num_peer_notif < 0 || num_peer_notif > 255) {
4284 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4289 /* reset values for 802.3ad/TLB/ALB */
4290 if (!bond_mode_uses_arp(bond_mode)) {
4292 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");
4293 pr_warn("Forcing miimon to 100msec\n");
4294 miimon = BOND_DEFAULT_MIIMON;
4298 if (tx_queues < 1 || tx_queues > 255) {
4299 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4300 tx_queues, BOND_DEFAULT_TX_QUEUES);
4301 tx_queues = BOND_DEFAULT_TX_QUEUES;
4304 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4305 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4307 all_slaves_active = 0;
4310 if (resend_igmp < 0 || resend_igmp > 255) {
4311 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4312 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4313 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4316 bond_opt_initval(&newval, packets_per_slave);
4317 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4318 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4319 packets_per_slave, USHRT_MAX);
4320 packets_per_slave = 1;
4323 if (bond_mode == BOND_MODE_ALB) {
4324 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",
4329 if (updelay || downdelay) {
4330 /* just warn the user the up/down delay will have
4331 * no effect since miimon is zero...
4333 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",
4334 updelay, downdelay);
4337 /* don't allow arp monitoring */
4339 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4340 miimon, arp_interval);
4344 if ((updelay % miimon) != 0) {
4345 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4346 updelay, miimon, (updelay / miimon) * miimon);
4351 if ((downdelay % miimon) != 0) {
4352 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4354 (downdelay / miimon) * miimon);
4357 downdelay /= miimon;
4360 if (arp_interval < 0) {
4361 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4362 arp_interval, INT_MAX);
4366 for (arp_ip_count = 0, i = 0;
4367 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4370 /* not a complete check, but good enough to catch mistakes */
4371 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4372 !bond_is_ip_target_ok(ip)) {
4373 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4377 if (bond_get_targets_ip(arp_target, ip) == -1)
4378 arp_target[arp_ip_count++] = ip;
4380 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4385 if (arp_interval && !arp_ip_count) {
4386 /* don't allow arping if no arp_ip_target given... */
4387 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4393 if (!arp_interval) {
4394 pr_err("arp_validate requires arp_interval\n");
4398 bond_opt_initstr(&newval, arp_validate);
4399 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4402 pr_err("Error: invalid arp_validate \"%s\"\n",
4406 arp_validate_value = valptr->value;
4408 arp_validate_value = 0;
4411 arp_all_targets_value = 0;
4412 if (arp_all_targets) {
4413 bond_opt_initstr(&newval, arp_all_targets);
4414 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4417 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4419 arp_all_targets_value = 0;
4421 arp_all_targets_value = valptr->value;
4426 pr_info("MII link monitoring set to %d ms\n", miimon);
4427 } else if (arp_interval) {
4428 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4429 arp_validate_value);
4430 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4431 arp_interval, valptr->string, arp_ip_count);
4433 for (i = 0; i < arp_ip_count; i++)
4434 pr_cont(" %s", arp_ip_target[i]);
4438 } else if (max_bonds) {
4439 /* miimon and arp_interval not set, we need one so things
4440 * work as expected, see bonding.txt for details
4442 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");
4445 if (primary && !bond_mode_uses_primary(bond_mode)) {
4446 /* currently, using a primary only makes sense
4447 * in active backup, TLB or ALB modes
4449 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4450 primary, bond_mode_name(bond_mode));
4454 if (primary && primary_reselect) {
4455 bond_opt_initstr(&newval, primary_reselect);
4456 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4459 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4463 primary_reselect_value = valptr->value;
4465 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4468 if (fail_over_mac) {
4469 bond_opt_initstr(&newval, fail_over_mac);
4470 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4473 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4477 fail_over_mac_value = valptr->value;
4478 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4479 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4481 fail_over_mac_value = BOND_FOM_NONE;
4484 bond_opt_initstr(&newval, "default");
4485 valptr = bond_opt_parse(
4486 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4489 pr_err("Error: No ad_actor_sys_prio default value");
4492 ad_actor_sys_prio = valptr->value;
4494 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4497 pr_err("Error: No ad_user_port_key default value");
4500 ad_user_port_key = valptr->value;
4502 if (lp_interval == 0) {
4503 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4504 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4505 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4508 /* fill params struct with the proper values */
4509 params->mode = bond_mode;
4510 params->xmit_policy = xmit_hashtype;
4511 params->miimon = miimon;
4512 params->num_peer_notif = num_peer_notif;
4513 params->arp_interval = arp_interval;
4514 params->arp_validate = arp_validate_value;
4515 params->arp_all_targets = arp_all_targets_value;
4516 params->updelay = updelay;
4517 params->downdelay = downdelay;
4518 params->use_carrier = use_carrier;
4519 params->lacp_fast = lacp_fast;
4520 params->primary[0] = 0;
4521 params->primary_reselect = primary_reselect_value;
4522 params->fail_over_mac = fail_over_mac_value;
4523 params->tx_queues = tx_queues;
4524 params->all_slaves_active = all_slaves_active;
4525 params->resend_igmp = resend_igmp;
4526 params->min_links = min_links;
4527 params->lp_interval = lp_interval;
4528 params->packets_per_slave = packets_per_slave;
4529 params->tlb_dynamic_lb = 1; /* Default value */
4530 params->ad_actor_sys_prio = ad_actor_sys_prio;
4531 eth_zero_addr(params->ad_actor_system);
4532 params->ad_user_port_key = ad_user_port_key;
4533 if (packets_per_slave > 0) {
4534 params->reciprocal_packets_per_slave =
4535 reciprocal_value(packets_per_slave);
4537 /* reciprocal_packets_per_slave is unused if
4538 * packets_per_slave is 0 or 1, just initialize it
4540 params->reciprocal_packets_per_slave =
4541 (struct reciprocal_value) { 0 };
4545 strncpy(params->primary, primary, IFNAMSIZ);
4546 params->primary[IFNAMSIZ - 1] = 0;
4549 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4554 static struct lock_class_key bonding_netdev_xmit_lock_key;
4555 static struct lock_class_key bonding_netdev_addr_lock_key;
4556 static struct lock_class_key bonding_tx_busylock_key;
4558 static void bond_set_lockdep_class_one(struct net_device *dev,
4559 struct netdev_queue *txq,
4562 lockdep_set_class(&txq->_xmit_lock,
4563 &bonding_netdev_xmit_lock_key);
4566 static void bond_set_lockdep_class(struct net_device *dev)
4568 lockdep_set_class(&dev->addr_list_lock,
4569 &bonding_netdev_addr_lock_key);
4570 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4571 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4574 /* Called from registration process */
4575 static int bond_init(struct net_device *bond_dev)
4577 struct bonding *bond = netdev_priv(bond_dev);
4578 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4580 netdev_dbg(bond_dev, "Begin bond_init\n");
4582 bond->wq = create_singlethread_workqueue(bond_dev->name);
4586 bond_set_lockdep_class(bond_dev);
4588 list_add_tail(&bond->bond_list, &bn->dev_list);
4590 bond_prepare_sysfs_group(bond);
4592 bond_debug_register(bond);
4594 /* Ensure valid dev_addr */
4595 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4596 bond_dev->addr_assign_type == NET_ADDR_PERM)
4597 eth_hw_addr_random(bond_dev);
4602 unsigned int bond_get_num_tx_queues(void)
4607 /* Create a new bond based on the specified name and bonding parameters.
4608 * If name is NULL, obtain a suitable "bond%d" name for us.
4609 * Caller must NOT hold rtnl_lock; we need to release it here before we
4610 * set up our sysfs entries.
4612 int bond_create(struct net *net, const char *name)
4614 struct net_device *bond_dev;
4615 struct bonding *bond;
4616 struct alb_bond_info *bond_info;
4621 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4622 name ? name : "bond%d", NET_NAME_UNKNOWN,
4623 bond_setup, tx_queues);
4625 pr_err("%s: eek! can't alloc netdev!\n", name);
4631 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4632 * It is set to 0 by default which is wrong.
4634 bond = netdev_priv(bond_dev);
4635 bond_info = &(BOND_ALB_INFO(bond));
4636 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4638 dev_net_set(bond_dev, net);
4639 bond_dev->rtnl_link_ops = &bond_link_ops;
4641 res = register_netdevice(bond_dev);
4643 netif_carrier_off(bond_dev);
4647 bond_destructor(bond_dev);
4651 static int __net_init bond_net_init(struct net *net)
4653 struct bond_net *bn = net_generic(net, bond_net_id);
4656 INIT_LIST_HEAD(&bn->dev_list);
4658 bond_create_proc_dir(bn);
4659 bond_create_sysfs(bn);
4664 static void __net_exit bond_net_exit(struct net *net)
4666 struct bond_net *bn = net_generic(net, bond_net_id);
4667 struct bonding *bond, *tmp_bond;
4670 bond_destroy_sysfs(bn);
4672 /* Kill off any bonds created after unregistering bond rtnl ops */
4674 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4675 unregister_netdevice_queue(bond->dev, &list);
4676 unregister_netdevice_many(&list);
4679 bond_destroy_proc_dir(bn);
4682 static struct pernet_operations bond_net_ops = {
4683 .init = bond_net_init,
4684 .exit = bond_net_exit,
4686 .size = sizeof(struct bond_net),
4689 static int __init bonding_init(void)
4694 pr_info("%s", bond_version);
4696 res = bond_check_params(&bonding_defaults);
4700 res = register_pernet_subsys(&bond_net_ops);
4704 res = bond_netlink_init();
4708 bond_create_debugfs();
4710 for (i = 0; i < max_bonds; i++) {
4711 res = bond_create(&init_net, NULL);
4716 register_netdevice_notifier(&bond_netdev_notifier);
4720 bond_destroy_debugfs();
4721 bond_netlink_fini();
4723 unregister_pernet_subsys(&bond_net_ops);
4728 static void __exit bonding_exit(void)
4730 unregister_netdevice_notifier(&bond_netdev_notifier);
4732 bond_destroy_debugfs();
4734 bond_netlink_fini();
4735 unregister_pernet_subsys(&bond_net_ops);
4737 #ifdef CONFIG_NET_POLL_CONTROLLER
4738 /* Make sure we don't have an imbalance on our netpoll blocking */
4739 WARN_ON(atomic_read(&netpoll_block_tx));
4743 module_init(bonding_init);
4744 module_exit(bonding_exit);
4745 MODULE_LICENSE("GPL");
4746 MODULE_VERSION(DRV_VERSION);
4747 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4748 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");