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);
217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
220 /*---------------------------- General routines -----------------------------*/
222 const char *bond_mode_name(int mode)
224 static const char *names[] = {
225 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
226 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
227 [BOND_MODE_XOR] = "load balancing (xor)",
228 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
229 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
230 [BOND_MODE_TLB] = "transmit load balancing",
231 [BOND_MODE_ALB] = "adaptive load balancing",
234 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
240 /*---------------------------------- VLAN -----------------------------------*/
243 * bond_dev_queue_xmit - Prepare skb for xmit.
245 * @bond: bond device that got this skb for tx.
246 * @skb: hw accel VLAN tagged skb to transmit
247 * @slave_dev: slave that is supposed to xmit this skbuff
249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
250 struct net_device *slave_dev)
252 skb->dev = slave_dev;
254 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
255 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
256 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
258 if (unlikely(netpoll_tx_running(bond->dev)))
259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
265 * We don't protect the slave list iteration with a lock because:
266 * a. This operation is performed in IOCTL context,
267 * b. The operation is protected by the RTNL semaphore in the 8021q code,
268 * c. Holding a lock with BH disabled while directly calling a base driver
269 * entry point is generally a BAD idea.
271 * The design of synchronization/protection for this operation in the 8021q
272 * module is good for one or more VLAN devices over a single physical device
273 * and cannot be extended for a teaming solution like bonding, so there is a
274 * potential race condition here where a net device from the vlan group might
275 * be referenced (either by a base driver or the 8021q code) while it is being
276 * removed from the system. However, it turns out we're not making matters
277 * worse, and if it works for regular VLAN usage it will work here too.
281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
282 * @bond_dev: bonding net device that got called
283 * @vid: vlan id being added
285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
286 __be16 proto, u16 vid)
288 struct bonding *bond = netdev_priv(bond_dev);
289 struct slave *slave, *rollback_slave;
290 struct list_head *iter;
293 bond_for_each_slave(bond, slave, iter) {
294 res = vlan_vid_add(slave->dev, proto, vid);
302 /* unwind to the slave that failed */
303 bond_for_each_slave(bond, rollback_slave, iter) {
304 if (rollback_slave == slave)
307 vlan_vid_del(rollback_slave->dev, proto, vid);
314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
315 * @bond_dev: bonding net device that got called
316 * @vid: vlan id being removed
318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
319 __be16 proto, u16 vid)
321 struct bonding *bond = netdev_priv(bond_dev);
322 struct list_head *iter;
325 bond_for_each_slave(bond, slave, iter)
326 vlan_vid_del(slave->dev, proto, vid);
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vid);
334 /*------------------------------- Link status -------------------------------*/
336 /* Set the carrier state for the master according to the state of its
337 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
338 * do special 802.3ad magic.
340 * Returns zero if carrier state does not change, nonzero if it does.
342 int bond_set_carrier(struct bonding *bond)
344 struct list_head *iter;
347 if (!bond_has_slaves(bond))
350 if (BOND_MODE(bond) == BOND_MODE_8023AD)
351 return bond_3ad_set_carrier(bond);
353 bond_for_each_slave(bond, slave, iter) {
354 if (slave->link == BOND_LINK_UP) {
355 if (!netif_carrier_ok(bond->dev)) {
356 netif_carrier_on(bond->dev);
364 if (netif_carrier_ok(bond->dev)) {
365 netif_carrier_off(bond->dev);
371 /* Get link speed and duplex from the slave's base driver
372 * using ethtool. If for some reason the call fails or the
373 * values are invalid, set speed and duplex to -1,
376 static void bond_update_speed_duplex(struct slave *slave)
378 struct net_device *slave_dev = slave->dev;
379 struct ethtool_cmd ecmd;
383 slave->speed = SPEED_UNKNOWN;
384 slave->duplex = DUPLEX_UNKNOWN;
386 res = __ethtool_get_settings(slave_dev, &ecmd);
390 slave_speed = ethtool_cmd_speed(&ecmd);
391 if (slave_speed == 0 || slave_speed == ((__u32) -1))
394 switch (ecmd.duplex) {
402 slave->speed = slave_speed;
403 slave->duplex = ecmd.duplex;
408 const char *bond_slave_link_status(s8 link)
424 /* if <dev> supports MII link status reporting, check its link status.
426 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
427 * depending upon the setting of the use_carrier parameter.
429 * Return either BMSR_LSTATUS, meaning that the link is up (or we
430 * can't tell and just pretend it is), or 0, meaning that the link is
433 * If reporting is non-zero, instead of faking link up, return -1 if
434 * both ETHTOOL and MII ioctls fail (meaning the device does not
435 * support them). If use_carrier is set, return whatever it says.
436 * It'd be nice if there was a good way to tell if a driver supports
437 * netif_carrier, but there really isn't.
439 static int bond_check_dev_link(struct bonding *bond,
440 struct net_device *slave_dev, int reporting)
442 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
443 int (*ioctl)(struct net_device *, struct ifreq *, int);
445 struct mii_ioctl_data *mii;
447 if (!reporting && !netif_running(slave_dev))
450 if (bond->params.use_carrier)
451 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
453 /* Try to get link status using Ethtool first. */
454 if (slave_dev->ethtool_ops->get_link)
455 return slave_dev->ethtool_ops->get_link(slave_dev) ?
458 /* Ethtool can't be used, fallback to MII ioctls. */
459 ioctl = slave_ops->ndo_do_ioctl;
461 /* TODO: set pointer to correct ioctl on a per team member
462 * bases to make this more efficient. that is, once
463 * we determine the correct ioctl, we will always
464 * call it and not the others for that team
468 /* We cannot assume that SIOCGMIIPHY will also read a
469 * register; not all network drivers (e.g., e100)
473 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
474 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
476 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
477 mii->reg_num = MII_BMSR;
478 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
479 return mii->val_out & BMSR_LSTATUS;
483 /* If reporting, report that either there's no dev->do_ioctl,
484 * or both SIOCGMIIREG and get_link failed (meaning that we
485 * cannot report link status). If not reporting, pretend
488 return reporting ? -1 : BMSR_LSTATUS;
491 /*----------------------------- Multicast list ------------------------------*/
493 /* Push the promiscuity flag down to appropriate slaves */
494 static int bond_set_promiscuity(struct bonding *bond, int inc)
496 struct list_head *iter;
499 if (bond_uses_primary(bond)) {
500 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
503 err = dev_set_promiscuity(curr_active->dev, inc);
507 bond_for_each_slave(bond, slave, iter) {
508 err = dev_set_promiscuity(slave->dev, inc);
516 /* Push the allmulti flag down to all slaves */
517 static int bond_set_allmulti(struct bonding *bond, int inc)
519 struct list_head *iter;
522 if (bond_uses_primary(bond)) {
523 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
526 err = dev_set_allmulti(curr_active->dev, inc);
530 bond_for_each_slave(bond, slave, iter) {
531 err = dev_set_allmulti(slave->dev, inc);
539 /* Retrieve the list of registered multicast addresses for the bonding
540 * device and retransmit an IGMP JOIN request to the current active
543 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
545 struct bonding *bond = container_of(work, struct bonding,
548 if (!rtnl_trylock()) {
549 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
552 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
554 if (bond->igmp_retrans > 1) {
555 bond->igmp_retrans--;
556 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
561 /* Flush bond's hardware addresses from slave */
562 static void bond_hw_addr_flush(struct net_device *bond_dev,
563 struct net_device *slave_dev)
565 struct bonding *bond = netdev_priv(bond_dev);
567 dev_uc_unsync(slave_dev, bond_dev);
568 dev_mc_unsync(slave_dev, bond_dev);
570 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
571 /* del lacpdu mc addr from mc list */
572 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
574 dev_mc_del(slave_dev, lacpdu_multicast);
578 /*--------------------------- Active slave change ---------------------------*/
580 /* Update the hardware address list and promisc/allmulti for the new and
581 * old active slaves (if any). Modes that are not using primary keep all
582 * slaves up date at all times; only the modes that use primary need to call
583 * this function to swap these settings during a failover.
585 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
586 struct slave *old_active)
589 if (bond->dev->flags & IFF_PROMISC)
590 dev_set_promiscuity(old_active->dev, -1);
592 if (bond->dev->flags & IFF_ALLMULTI)
593 dev_set_allmulti(old_active->dev, -1);
595 bond_hw_addr_flush(bond->dev, old_active->dev);
599 /* FIXME: Signal errors upstream. */
600 if (bond->dev->flags & IFF_PROMISC)
601 dev_set_promiscuity(new_active->dev, 1);
603 if (bond->dev->flags & IFF_ALLMULTI)
604 dev_set_allmulti(new_active->dev, 1);
606 netif_addr_lock_bh(bond->dev);
607 dev_uc_sync(new_active->dev, bond->dev);
608 dev_mc_sync(new_active->dev, bond->dev);
609 netif_addr_unlock_bh(bond->dev);
614 * bond_set_dev_addr - clone slave's address to bond
615 * @bond_dev: bond net device
616 * @slave_dev: slave net device
618 * Should be called with RTNL held.
620 static void bond_set_dev_addr(struct net_device *bond_dev,
621 struct net_device *slave_dev)
623 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
624 bond_dev, slave_dev, slave_dev->addr_len);
625 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
626 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
627 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
630 static struct slave *bond_get_old_active(struct bonding *bond,
631 struct slave *new_active)
634 struct list_head *iter;
636 bond_for_each_slave(bond, slave, iter) {
637 if (slave == new_active)
640 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
647 /* bond_do_fail_over_mac
649 * Perform special MAC address swapping for fail_over_mac settings
653 static void bond_do_fail_over_mac(struct bonding *bond,
654 struct slave *new_active,
655 struct slave *old_active)
657 u8 tmp_mac[ETH_ALEN];
658 struct sockaddr saddr;
661 switch (bond->params.fail_over_mac) {
662 case BOND_FOM_ACTIVE:
664 bond_set_dev_addr(bond->dev, new_active->dev);
666 case BOND_FOM_FOLLOW:
667 /* if new_active && old_active, swap them
668 * if just old_active, do nothing (going to no active slave)
669 * if just new_active, set new_active to bond's MAC
675 old_active = bond_get_old_active(bond, new_active);
678 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
679 ether_addr_copy(saddr.sa_data,
680 old_active->dev->dev_addr);
681 saddr.sa_family = new_active->dev->type;
683 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
684 saddr.sa_family = bond->dev->type;
687 rv = dev_set_mac_address(new_active->dev, &saddr);
689 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
690 -rv, new_active->dev->name);
697 ether_addr_copy(saddr.sa_data, tmp_mac);
698 saddr.sa_family = old_active->dev->type;
700 rv = dev_set_mac_address(old_active->dev, &saddr);
702 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
703 -rv, new_active->dev->name);
707 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
708 bond->params.fail_over_mac);
714 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
716 struct slave *prim = rtnl_dereference(bond->primary_slave);
717 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
719 if (!prim || prim->link != BOND_LINK_UP) {
720 if (!curr || curr->link != BOND_LINK_UP)
725 if (bond->force_primary) {
726 bond->force_primary = false;
730 if (!curr || curr->link != BOND_LINK_UP)
733 /* At this point, prim and curr are both up */
734 switch (bond->params.primary_reselect) {
735 case BOND_PRI_RESELECT_ALWAYS:
737 case BOND_PRI_RESELECT_BETTER:
738 if (prim->speed < curr->speed)
740 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
743 case BOND_PRI_RESELECT_FAILURE:
746 netdev_err(bond->dev, "impossible primary_reselect %d\n",
747 bond->params.primary_reselect);
753 * bond_find_best_slave - select the best available slave to be the active one
754 * @bond: our bonding struct
756 static struct slave *bond_find_best_slave(struct bonding *bond)
758 struct slave *slave, *bestslave = NULL;
759 struct list_head *iter;
760 int mintime = bond->params.updelay;
762 slave = bond_choose_primary_or_current(bond);
766 bond_for_each_slave(bond, slave, iter) {
767 if (slave->link == BOND_LINK_UP)
769 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
770 slave->delay < mintime) {
771 mintime = slave->delay;
779 static bool bond_should_notify_peers(struct bonding *bond)
784 slave = rcu_dereference(bond->curr_active_slave);
787 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
788 slave ? slave->dev->name : "NULL");
790 if (!slave || !bond->send_peer_notif ||
791 !netif_carrier_ok(bond->dev) ||
792 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
799 * change_active_interface - change the active slave into the specified one
800 * @bond: our bonding struct
801 * @new: the new slave to make the active one
803 * Set the new slave to the bond's settings and unset them on the old
805 * Setting include flags, mc-list, promiscuity, allmulti, etc.
807 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
808 * because it is apparently the best available slave we have, even though its
809 * updelay hasn't timed out yet.
811 * Caller must hold RTNL.
813 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
815 struct slave *old_active;
819 old_active = rtnl_dereference(bond->curr_active_slave);
821 if (old_active == new_active)
825 new_active->last_link_up = jiffies;
827 if (new_active->link == BOND_LINK_BACK) {
828 if (bond_uses_primary(bond)) {
829 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
830 new_active->dev->name,
831 (bond->params.updelay - new_active->delay) * bond->params.miimon);
834 new_active->delay = 0;
835 bond_set_slave_link_state(new_active, BOND_LINK_UP);
837 if (BOND_MODE(bond) == BOND_MODE_8023AD)
838 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
840 if (bond_is_lb(bond))
841 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
843 if (bond_uses_primary(bond)) {
844 netdev_info(bond->dev, "making interface %s the new active one\n",
845 new_active->dev->name);
850 if (bond_uses_primary(bond))
851 bond_hw_addr_swap(bond, new_active, old_active);
853 if (bond_is_lb(bond)) {
854 bond_alb_handle_active_change(bond, new_active);
856 bond_set_slave_inactive_flags(old_active,
857 BOND_SLAVE_NOTIFY_NOW);
859 bond_set_slave_active_flags(new_active,
860 BOND_SLAVE_NOTIFY_NOW);
862 rcu_assign_pointer(bond->curr_active_slave, new_active);
865 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
867 bond_set_slave_inactive_flags(old_active,
868 BOND_SLAVE_NOTIFY_NOW);
871 bool should_notify_peers = false;
873 bond_set_slave_active_flags(new_active,
874 BOND_SLAVE_NOTIFY_NOW);
876 if (bond->params.fail_over_mac)
877 bond_do_fail_over_mac(bond, new_active,
880 if (netif_running(bond->dev)) {
881 bond->send_peer_notif =
882 bond->params.num_peer_notif;
883 should_notify_peers =
884 bond_should_notify_peers(bond);
887 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
888 if (should_notify_peers)
889 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
894 /* resend IGMP joins since active slave has changed or
895 * all were sent on curr_active_slave.
896 * resend only if bond is brought up with the affected
897 * bonding modes and the retransmission is enabled
899 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
900 ((bond_uses_primary(bond) && new_active) ||
901 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
902 bond->igmp_retrans = bond->params.resend_igmp;
903 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
908 * bond_select_active_slave - select a new active slave, if needed
909 * @bond: our bonding struct
911 * This functions should be called when one of the following occurs:
912 * - The old curr_active_slave has been released or lost its link.
913 * - The primary_slave has got its link back.
914 * - A slave has got its link back and there's no old curr_active_slave.
916 * Caller must hold RTNL.
918 void bond_select_active_slave(struct bonding *bond)
920 struct slave *best_slave;
925 best_slave = bond_find_best_slave(bond);
926 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
927 bond_change_active_slave(bond, best_slave);
928 rv = bond_set_carrier(bond);
932 if (netif_carrier_ok(bond->dev)) {
933 netdev_info(bond->dev, "first active interface up!\n");
935 netdev_info(bond->dev, "now running without any active interface!\n");
940 #ifdef CONFIG_NET_POLL_CONTROLLER
941 static inline int slave_enable_netpoll(struct slave *slave)
946 np = kzalloc(sizeof(*np), GFP_KERNEL);
951 err = __netpoll_setup(np, slave->dev);
960 static inline void slave_disable_netpoll(struct slave *slave)
962 struct netpoll *np = slave->np;
968 __netpoll_free_async(np);
971 static void bond_poll_controller(struct net_device *bond_dev)
973 struct bonding *bond = netdev_priv(bond_dev);
974 struct slave *slave = NULL;
975 struct list_head *iter;
976 struct ad_info ad_info;
977 struct netpoll_info *ni;
978 const struct net_device_ops *ops;
980 if (BOND_MODE(bond) == BOND_MODE_8023AD)
981 if (bond_3ad_get_active_agg_info(bond, &ad_info))
984 bond_for_each_slave_rcu(bond, slave, iter) {
985 ops = slave->dev->netdev_ops;
986 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
989 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
990 struct aggregator *agg =
991 SLAVE_AD_INFO(slave)->port.aggregator;
994 agg->aggregator_identifier != ad_info.aggregator_id)
998 ni = rcu_dereference_bh(slave->dev->npinfo);
999 if (down_trylock(&ni->dev_lock))
1001 ops->ndo_poll_controller(slave->dev);
1006 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1008 struct bonding *bond = netdev_priv(bond_dev);
1009 struct list_head *iter;
1010 struct slave *slave;
1012 bond_for_each_slave(bond, slave, iter)
1013 if (bond_slave_is_up(slave))
1014 slave_disable_netpoll(slave);
1017 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1019 struct bonding *bond = netdev_priv(dev);
1020 struct list_head *iter;
1021 struct slave *slave;
1024 bond_for_each_slave(bond, slave, iter) {
1025 err = slave_enable_netpoll(slave);
1027 bond_netpoll_cleanup(dev);
1034 static inline int slave_enable_netpoll(struct slave *slave)
1038 static inline void slave_disable_netpoll(struct slave *slave)
1041 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1046 /*---------------------------------- IOCTL ----------------------------------*/
1048 static netdev_features_t bond_fix_features(struct net_device *dev,
1049 netdev_features_t features)
1051 struct bonding *bond = netdev_priv(dev);
1052 struct list_head *iter;
1053 netdev_features_t mask;
1054 struct slave *slave;
1058 features &= ~NETIF_F_ONE_FOR_ALL;
1059 features |= NETIF_F_ALL_FOR_ALL;
1061 bond_for_each_slave(bond, slave, iter) {
1062 features = netdev_increment_features(features,
1063 slave->dev->features,
1066 features = netdev_add_tso_features(features, mask);
1071 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1072 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1073 NETIF_F_HIGHDMA | NETIF_F_LRO)
1075 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1078 static void bond_compute_features(struct bonding *bond)
1080 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1081 IFF_XMIT_DST_RELEASE_PERM;
1082 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1083 netdev_features_t enc_features = BOND_ENC_FEATURES;
1084 struct net_device *bond_dev = bond->dev;
1085 struct list_head *iter;
1086 struct slave *slave;
1087 unsigned short max_hard_header_len = ETH_HLEN;
1088 unsigned int gso_max_size = GSO_MAX_SIZE;
1089 u16 gso_max_segs = GSO_MAX_SEGS;
1091 if (!bond_has_slaves(bond))
1093 vlan_features &= NETIF_F_ALL_FOR_ALL;
1095 bond_for_each_slave(bond, slave, iter) {
1096 vlan_features = netdev_increment_features(vlan_features,
1097 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1099 enc_features = netdev_increment_features(enc_features,
1100 slave->dev->hw_enc_features,
1102 dst_release_flag &= slave->dev->priv_flags;
1103 if (slave->dev->hard_header_len > max_hard_header_len)
1104 max_hard_header_len = slave->dev->hard_header_len;
1106 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1107 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1111 bond_dev->vlan_features = vlan_features;
1112 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1113 bond_dev->hard_header_len = max_hard_header_len;
1114 bond_dev->gso_max_segs = gso_max_segs;
1115 netif_set_gso_max_size(bond_dev, gso_max_size);
1117 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1118 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1119 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1120 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1122 netdev_change_features(bond_dev);
1125 static void bond_setup_by_slave(struct net_device *bond_dev,
1126 struct net_device *slave_dev)
1128 bond_dev->header_ops = slave_dev->header_ops;
1130 bond_dev->type = slave_dev->type;
1131 bond_dev->hard_header_len = slave_dev->hard_header_len;
1132 bond_dev->addr_len = slave_dev->addr_len;
1134 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1135 slave_dev->addr_len);
1138 /* On bonding slaves other than the currently active slave, suppress
1139 * duplicates except for alb non-mcast/bcast.
1141 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1142 struct slave *slave,
1143 struct bonding *bond)
1145 if (bond_is_slave_inactive(slave)) {
1146 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1147 skb->pkt_type != PACKET_BROADCAST &&
1148 skb->pkt_type != PACKET_MULTICAST)
1155 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1157 struct sk_buff *skb = *pskb;
1158 struct slave *slave;
1159 struct bonding *bond;
1160 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1162 int ret = RX_HANDLER_ANOTHER;
1164 skb = skb_share_check(skb, GFP_ATOMIC);
1166 return RX_HANDLER_CONSUMED;
1170 slave = bond_slave_get_rcu(skb->dev);
1173 recv_probe = ACCESS_ONCE(bond->recv_probe);
1175 ret = recv_probe(skb, bond, slave);
1176 if (ret == RX_HANDLER_CONSUMED) {
1182 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1183 return RX_HANDLER_EXACT;
1186 skb->dev = bond->dev;
1188 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1189 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1190 skb->pkt_type == PACKET_HOST) {
1192 if (unlikely(skb_cow_head(skb,
1193 skb->data - skb_mac_header(skb)))) {
1195 return RX_HANDLER_CONSUMED;
1197 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1203 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1204 struct net_device *slave_dev,
1205 struct slave *slave)
1209 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, 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 in-use? */
1321 if (netdev_is_rx_handler_busy(slave_dev)) {
1322 netdev_err(bond_dev,
1323 "Error: Device is in use and cannot be enslaved\n");
1327 if (bond_dev == slave_dev) {
1328 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1332 /* vlan challenged mutual exclusion */
1333 /* no need to lock since we're protected by rtnl_lock */
1334 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1335 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1337 if (vlan_uses_dev(bond_dev)) {
1338 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1339 slave_dev->name, bond_dev->name);
1342 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1343 slave_dev->name, slave_dev->name,
1347 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1351 /* Old ifenslave binaries are no longer supported. These can
1352 * be identified with moderate accuracy by the state of the slave:
1353 * the current ifenslave will set the interface down prior to
1354 * enslaving it; the old ifenslave will not.
1356 if ((slave_dev->flags & IFF_UP)) {
1357 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1360 goto err_undo_flags;
1363 /* set bonding device ether type by slave - bonding netdevices are
1364 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1365 * there is a need to override some of the type dependent attribs/funcs.
1367 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1368 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1370 if (!bond_has_slaves(bond)) {
1371 if (bond_dev->type != slave_dev->type) {
1372 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1373 bond_dev->type, slave_dev->type);
1375 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1377 res = notifier_to_errno(res);
1379 netdev_err(bond_dev, "refused to change device type\n");
1381 goto err_undo_flags;
1384 /* Flush unicast and multicast addresses */
1385 dev_uc_flush(bond_dev);
1386 dev_mc_flush(bond_dev);
1388 if (slave_dev->type != ARPHRD_ETHER)
1389 bond_setup_by_slave(bond_dev, slave_dev);
1391 ether_setup(bond_dev);
1392 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1395 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1398 } else if (bond_dev->type != slave_dev->type) {
1399 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1400 slave_dev->name, slave_dev->type, bond_dev->type);
1402 goto err_undo_flags;
1405 if (slave_ops->ndo_set_mac_address == NULL) {
1406 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1407 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1408 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1409 if (!bond_has_slaves(bond)) {
1410 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1411 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1413 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");
1415 goto err_undo_flags;
1420 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1422 /* If this is the first slave, then we need to set the master's hardware
1423 * address to be the same as the slave's.
1425 if (!bond_has_slaves(bond) &&
1426 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1427 bond_set_dev_addr(bond->dev, slave_dev);
1429 new_slave = bond_alloc_slave(bond);
1432 goto err_undo_flags;
1435 new_slave->bond = bond;
1436 new_slave->dev = slave_dev;
1437 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1438 * is set via sysfs or module option if desired.
1440 new_slave->queue_id = 0;
1442 /* Save slave's original mtu and then set it to match the bond */
1443 new_slave->original_mtu = slave_dev->mtu;
1444 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1446 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1450 /* Save slave's original ("permanent") mac address for modes
1451 * that need it, and for restoring it upon release, and then
1452 * set it to the master's address
1454 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1456 if (!bond->params.fail_over_mac ||
1457 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1458 /* Set slave to master's mac address. The application already
1459 * set the master's mac address to that of the first slave
1461 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1462 addr.sa_family = slave_dev->type;
1463 res = dev_set_mac_address(slave_dev, &addr);
1465 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1466 goto err_restore_mtu;
1470 /* set slave flag before open to prevent IPv6 addrconf */
1471 slave_dev->flags |= IFF_SLAVE;
1473 /* open the slave since the application closed it */
1474 res = dev_open(slave_dev);
1476 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1477 goto err_restore_mac;
1480 slave_dev->priv_flags |= IFF_BONDING;
1481 /* initialize slave stats */
1482 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1484 if (bond_is_lb(bond)) {
1485 /* bond_alb_init_slave() must be called before all other stages since
1486 * it might fail and we do not want to have to undo everything
1488 res = bond_alb_init_slave(bond, new_slave);
1493 /* If the mode uses primary, then the following is handled by
1494 * bond_change_active_slave().
1496 if (!bond_uses_primary(bond)) {
1497 /* set promiscuity level to new slave */
1498 if (bond_dev->flags & IFF_PROMISC) {
1499 res = dev_set_promiscuity(slave_dev, 1);
1504 /* set allmulti level to new slave */
1505 if (bond_dev->flags & IFF_ALLMULTI) {
1506 res = dev_set_allmulti(slave_dev, 1);
1511 netif_addr_lock_bh(bond_dev);
1513 dev_mc_sync_multiple(slave_dev, bond_dev);
1514 dev_uc_sync_multiple(slave_dev, bond_dev);
1516 netif_addr_unlock_bh(bond_dev);
1519 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1520 /* add lacpdu mc addr to mc list */
1521 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1523 dev_mc_add(slave_dev, lacpdu_multicast);
1526 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1528 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1533 prev_slave = bond_last_slave(bond);
1535 new_slave->delay = 0;
1536 new_slave->link_failure_count = 0;
1538 bond_update_speed_duplex(new_slave);
1540 new_slave->last_rx = jiffies -
1541 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1542 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1543 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1545 if (bond->params.miimon && !bond->params.use_carrier) {
1546 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1548 if ((link_reporting == -1) && !bond->params.arp_interval) {
1549 /* miimon is set but a bonded network driver
1550 * does not support ETHTOOL/MII and
1551 * arp_interval is not set. Note: if
1552 * use_carrier is enabled, we will never go
1553 * here (because netif_carrier is always
1554 * supported); thus, we don't need to change
1555 * the messages for netif_carrier.
1557 netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1559 } else if (link_reporting == -1) {
1560 /* unable get link status using mii/ethtool */
1561 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",
1566 /* check for initial state */
1567 if (bond->params.miimon) {
1568 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1569 if (bond->params.updelay) {
1570 bond_set_slave_link_state(new_slave,
1572 new_slave->delay = bond->params.updelay;
1574 bond_set_slave_link_state(new_slave,
1578 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1580 } else if (bond->params.arp_interval) {
1581 bond_set_slave_link_state(new_slave,
1582 (netif_carrier_ok(slave_dev) ?
1583 BOND_LINK_UP : BOND_LINK_DOWN));
1585 bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1588 if (new_slave->link != BOND_LINK_DOWN)
1589 new_slave->last_link_up = jiffies;
1590 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1591 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1592 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1594 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1595 /* if there is a primary slave, remember it */
1596 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1597 rcu_assign_pointer(bond->primary_slave, new_slave);
1598 bond->force_primary = true;
1602 switch (BOND_MODE(bond)) {
1603 case BOND_MODE_ACTIVEBACKUP:
1604 bond_set_slave_inactive_flags(new_slave,
1605 BOND_SLAVE_NOTIFY_NOW);
1607 case BOND_MODE_8023AD:
1608 /* in 802.3ad mode, the internal mechanism
1609 * will activate the slaves in the selected
1612 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1613 /* if this is the first slave */
1615 SLAVE_AD_INFO(new_slave)->id = 1;
1616 /* Initialize AD with the number of times that the AD timer is called in 1 second
1617 * can be called only after the mac address of the bond is set
1619 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1621 SLAVE_AD_INFO(new_slave)->id =
1622 SLAVE_AD_INFO(prev_slave)->id + 1;
1625 bond_3ad_bind_slave(new_slave);
1629 bond_set_active_slave(new_slave);
1630 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1633 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1635 /* always active in trunk mode */
1636 bond_set_active_slave(new_slave);
1638 /* In trunking mode there is little meaning to curr_active_slave
1639 * anyway (it holds no special properties of the bond device),
1640 * so we can change it without calling change_active_interface()
1642 if (!rcu_access_pointer(bond->curr_active_slave) &&
1643 new_slave->link == BOND_LINK_UP)
1644 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1647 } /* switch(bond_mode) */
1649 #ifdef CONFIG_NET_POLL_CONTROLLER
1650 slave_dev->npinfo = bond->dev->npinfo;
1651 if (slave_dev->npinfo) {
1652 if (slave_enable_netpoll(new_slave)) {
1653 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1660 if (!(bond_dev->features & NETIF_F_LRO))
1661 dev_disable_lro(slave_dev);
1663 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1666 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1670 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1672 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1673 goto err_unregister;
1676 res = bond_sysfs_slave_add(new_slave);
1678 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1679 goto err_upper_unlink;
1683 bond_compute_features(bond);
1684 bond_set_carrier(bond);
1686 if (bond_uses_primary(bond)) {
1688 bond_select_active_slave(bond);
1689 unblock_netpoll_tx();
1692 if (bond_mode_uses_xmit_hash(bond))
1693 bond_update_slave_arr(bond, NULL);
1695 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1697 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1698 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1700 /* enslave is successful */
1701 bond_queue_slave_event(new_slave);
1704 /* Undo stages on error */
1706 bond_upper_dev_unlink(bond_dev, slave_dev);
1709 netdev_rx_handler_unregister(slave_dev);
1712 if (!bond_uses_primary(bond))
1713 bond_hw_addr_flush(bond_dev, slave_dev);
1715 vlan_vids_del_by_dev(slave_dev, bond_dev);
1716 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1717 RCU_INIT_POINTER(bond->primary_slave, NULL);
1718 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1720 bond_change_active_slave(bond, NULL);
1721 bond_select_active_slave(bond);
1722 unblock_netpoll_tx();
1724 /* either primary_slave or curr_active_slave might've changed */
1726 slave_disable_netpoll(new_slave);
1729 slave_dev->priv_flags &= ~IFF_BONDING;
1730 dev_close(slave_dev);
1733 slave_dev->flags &= ~IFF_SLAVE;
1734 if (!bond->params.fail_over_mac ||
1735 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1736 /* XXX TODO - fom follow mode needs to change master's
1737 * MAC if this slave's MAC is in use by the bond, or at
1738 * least print a warning.
1740 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1741 addr.sa_family = slave_dev->type;
1742 dev_set_mac_address(slave_dev, &addr);
1746 dev_set_mtu(slave_dev, new_slave->original_mtu);
1749 bond_free_slave(new_slave);
1752 /* Enslave of first slave has failed and we need to fix master's mac */
1753 if (!bond_has_slaves(bond)) {
1754 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1755 slave_dev->dev_addr))
1756 eth_hw_addr_random(bond_dev);
1757 if (bond_dev->type != ARPHRD_ETHER) {
1758 dev_close(bond_dev);
1759 ether_setup(bond_dev);
1760 bond_dev->flags |= IFF_MASTER;
1761 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1768 /* Try to release the slave device <slave> from the bond device <master>
1769 * It is legal to access curr_active_slave without a lock because all the function
1770 * is RTNL-locked. If "all" is true it means that the function is being called
1771 * while destroying a bond interface and all slaves are being released.
1773 * The rules for slave state should be:
1774 * for Active/Backup:
1775 * Active stays on all backups go down
1776 * for Bonded connections:
1777 * The first up interface should be left on and all others downed.
1779 static int __bond_release_one(struct net_device *bond_dev,
1780 struct net_device *slave_dev,
1783 struct bonding *bond = netdev_priv(bond_dev);
1784 struct slave *slave, *oldcurrent;
1785 struct sockaddr addr;
1786 int old_flags = bond_dev->flags;
1787 netdev_features_t old_features = bond_dev->features;
1789 /* slave is not a slave or master is not master of this slave */
1790 if (!(slave_dev->flags & IFF_SLAVE) ||
1791 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1792 netdev_dbg(bond_dev, "cannot release %s\n",
1799 slave = bond_get_slave_by_dev(bond, slave_dev);
1801 /* not a slave of this bond */
1802 netdev_info(bond_dev, "%s not enslaved\n",
1804 unblock_netpoll_tx();
1808 bond_sysfs_slave_del(slave);
1810 /* recompute stats just before removing the slave */
1811 bond_get_stats(bond->dev, &bond->bond_stats);
1813 bond_upper_dev_unlink(bond_dev, slave_dev);
1814 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1815 * for this slave anymore.
1817 netdev_rx_handler_unregister(slave_dev);
1819 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1820 bond_3ad_unbind_slave(slave);
1822 if (bond_mode_uses_xmit_hash(bond))
1823 bond_update_slave_arr(bond, slave);
1825 netdev_info(bond_dev, "Releasing %s interface %s\n",
1826 bond_is_active_slave(slave) ? "active" : "backup",
1829 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1831 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1833 if (!all && (!bond->params.fail_over_mac ||
1834 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1835 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1836 bond_has_slaves(bond))
1837 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",
1838 slave_dev->name, slave->perm_hwaddr,
1839 bond_dev->name, slave_dev->name);
1842 if (rtnl_dereference(bond->primary_slave) == slave)
1843 RCU_INIT_POINTER(bond->primary_slave, NULL);
1845 if (oldcurrent == slave)
1846 bond_change_active_slave(bond, NULL);
1848 if (bond_is_lb(bond)) {
1849 /* Must be called only after the slave has been
1850 * detached from the list and the curr_active_slave
1851 * has been cleared (if our_slave == old_current),
1852 * but before a new active slave is selected.
1854 bond_alb_deinit_slave(bond, slave);
1858 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1859 } else if (oldcurrent == slave) {
1860 /* Note that we hold RTNL over this sequence, so there
1861 * is no concern that another slave add/remove event
1864 bond_select_active_slave(bond);
1867 if (!bond_has_slaves(bond)) {
1868 bond_set_carrier(bond);
1869 eth_hw_addr_random(bond_dev);
1872 unblock_netpoll_tx();
1876 if (!bond_has_slaves(bond)) {
1877 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1878 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1881 bond_compute_features(bond);
1882 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1883 (old_features & NETIF_F_VLAN_CHALLENGED))
1884 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1885 slave_dev->name, bond_dev->name);
1887 vlan_vids_del_by_dev(slave_dev, bond_dev);
1889 /* If the mode uses primary, then this case was handled above by
1890 * bond_change_active_slave(..., NULL)
1892 if (!bond_uses_primary(bond)) {
1893 /* unset promiscuity level from slave
1894 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1895 * of the IFF_PROMISC flag in the bond_dev, but we need the
1896 * value of that flag before that change, as that was the value
1897 * when this slave was attached, so we cache at the start of the
1898 * function and use it here. Same goes for ALLMULTI below
1900 if (old_flags & IFF_PROMISC)
1901 dev_set_promiscuity(slave_dev, -1);
1903 /* unset allmulti level from slave */
1904 if (old_flags & IFF_ALLMULTI)
1905 dev_set_allmulti(slave_dev, -1);
1907 bond_hw_addr_flush(bond_dev, slave_dev);
1910 slave_disable_netpoll(slave);
1912 /* close slave before restoring its mac address */
1913 dev_close(slave_dev);
1915 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1916 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1917 /* restore original ("permanent") mac address */
1918 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1919 addr.sa_family = slave_dev->type;
1920 dev_set_mac_address(slave_dev, &addr);
1923 dev_set_mtu(slave_dev, slave->original_mtu);
1925 slave_dev->priv_flags &= ~IFF_BONDING;
1927 bond_free_slave(slave);
1932 /* A wrapper used because of ndo_del_link */
1933 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1935 return __bond_release_one(bond_dev, slave_dev, false);
1938 /* First release a slave and then destroy the bond if no more slaves are left.
1939 * Must be under rtnl_lock when this function is called.
1941 static int bond_release_and_destroy(struct net_device *bond_dev,
1942 struct net_device *slave_dev)
1944 struct bonding *bond = netdev_priv(bond_dev);
1947 ret = bond_release(bond_dev, slave_dev);
1948 if (ret == 0 && !bond_has_slaves(bond)) {
1949 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1950 netdev_info(bond_dev, "Destroying bond %s\n",
1952 bond_remove_proc_entry(bond);
1953 unregister_netdevice(bond_dev);
1958 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1960 struct bonding *bond = netdev_priv(bond_dev);
1961 bond_fill_ifbond(bond, info);
1965 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1967 struct bonding *bond = netdev_priv(bond_dev);
1968 struct list_head *iter;
1969 int i = 0, res = -ENODEV;
1970 struct slave *slave;
1972 bond_for_each_slave(bond, slave, iter) {
1973 if (i++ == (int)info->slave_id) {
1975 bond_fill_ifslave(slave, info);
1983 /*-------------------------------- Monitoring -------------------------------*/
1985 /* called with rcu_read_lock() */
1986 static int bond_miimon_inspect(struct bonding *bond)
1988 int link_state, commit = 0;
1989 struct list_head *iter;
1990 struct slave *slave;
1991 bool ignore_updelay;
1993 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1995 bond_for_each_slave_rcu(bond, slave, iter) {
1996 slave->new_link = BOND_LINK_NOCHANGE;
1998 link_state = bond_check_dev_link(bond, slave->dev, 0);
2000 switch (slave->link) {
2005 bond_set_slave_link_state(slave, BOND_LINK_FAIL);
2006 slave->delay = bond->params.downdelay;
2008 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2010 BOND_MODE_ACTIVEBACKUP) ?
2011 (bond_is_active_slave(slave) ?
2012 "active " : "backup ") : "",
2014 bond->params.downdelay * bond->params.miimon);
2017 case BOND_LINK_FAIL:
2019 /* recovered before downdelay expired */
2020 bond_set_slave_link_state(slave, BOND_LINK_UP);
2021 slave->last_link_up = jiffies;
2022 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2023 (bond->params.downdelay - slave->delay) *
2024 bond->params.miimon,
2029 if (slave->delay <= 0) {
2030 slave->new_link = BOND_LINK_DOWN;
2038 case BOND_LINK_DOWN:
2042 bond_set_slave_link_state(slave, BOND_LINK_BACK);
2043 slave->delay = bond->params.updelay;
2046 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2048 ignore_updelay ? 0 :
2049 bond->params.updelay *
2050 bond->params.miimon);
2053 case BOND_LINK_BACK:
2055 bond_set_slave_link_state(slave,
2057 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2058 (bond->params.updelay - slave->delay) *
2059 bond->params.miimon,
2068 if (slave->delay <= 0) {
2069 slave->new_link = BOND_LINK_UP;
2071 ignore_updelay = false;
2083 static void bond_miimon_commit(struct bonding *bond)
2085 struct list_head *iter;
2086 struct slave *slave, *primary;
2088 bond_for_each_slave(bond, slave, iter) {
2089 switch (slave->new_link) {
2090 case BOND_LINK_NOCHANGE:
2094 bond_set_slave_link_state(slave, BOND_LINK_UP);
2095 slave->last_link_up = jiffies;
2097 primary = rtnl_dereference(bond->primary_slave);
2098 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2099 /* prevent it from being the active one */
2100 bond_set_backup_slave(slave);
2101 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2102 /* make it immediately active */
2103 bond_set_active_slave(slave);
2104 } else if (slave != primary) {
2105 /* prevent it from being the active one */
2106 bond_set_backup_slave(slave);
2109 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2111 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2112 slave->duplex ? "full" : "half");
2114 /* notify ad that the link status has changed */
2115 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2116 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2118 if (bond_is_lb(bond))
2119 bond_alb_handle_link_change(bond, slave,
2122 if (BOND_MODE(bond) == BOND_MODE_XOR)
2123 bond_update_slave_arr(bond, NULL);
2125 if (!bond->curr_active_slave || slave == primary)
2130 case BOND_LINK_DOWN:
2131 if (slave->link_failure_count < UINT_MAX)
2132 slave->link_failure_count++;
2134 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2136 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2137 BOND_MODE(bond) == BOND_MODE_8023AD)
2138 bond_set_slave_inactive_flags(slave,
2139 BOND_SLAVE_NOTIFY_NOW);
2141 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2144 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2145 bond_3ad_handle_link_change(slave,
2148 if (bond_is_lb(bond))
2149 bond_alb_handle_link_change(bond, slave,
2152 if (BOND_MODE(bond) == BOND_MODE_XOR)
2153 bond_update_slave_arr(bond, NULL);
2155 if (slave == rcu_access_pointer(bond->curr_active_slave))
2161 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2162 slave->new_link, slave->dev->name);
2163 slave->new_link = BOND_LINK_NOCHANGE;
2170 bond_select_active_slave(bond);
2171 unblock_netpoll_tx();
2174 bond_set_carrier(bond);
2179 * Really a wrapper that splits the mii monitor into two phases: an
2180 * inspection, then (if inspection indicates something needs to be done)
2181 * an acquisition of appropriate locks followed by a commit phase to
2182 * implement whatever link state changes are indicated.
2184 static void bond_mii_monitor(struct work_struct *work)
2186 struct bonding *bond = container_of(work, struct bonding,
2188 bool should_notify_peers = false;
2189 unsigned long delay;
2191 delay = msecs_to_jiffies(bond->params.miimon);
2193 if (!bond_has_slaves(bond))
2198 should_notify_peers = bond_should_notify_peers(bond);
2200 if (bond_miimon_inspect(bond)) {
2203 /* Race avoidance with bond_close cancel of workqueue */
2204 if (!rtnl_trylock()) {
2206 should_notify_peers = false;
2210 bond_miimon_commit(bond);
2212 rtnl_unlock(); /* might sleep, hold no other locks */
2217 if (bond->params.miimon)
2218 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2220 if (should_notify_peers) {
2221 if (!rtnl_trylock())
2223 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2228 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2230 struct net_device *upper;
2231 struct list_head *iter;
2234 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2238 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2239 if (ip == bond_confirm_addr(upper, 0, ip)) {
2249 /* We go to the (large) trouble of VLAN tagging ARP frames because
2250 * switches in VLAN mode (especially if ports are configured as
2251 * "native" to a VLAN) might not pass non-tagged frames.
2253 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2254 __be32 dest_ip, __be32 src_ip,
2255 struct bond_vlan_tag *tags)
2257 struct sk_buff *skb;
2258 struct bond_vlan_tag *outer_tag = tags;
2260 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2261 arp_op, slave_dev->name, &dest_ip, &src_ip);
2263 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2264 NULL, slave_dev->dev_addr, NULL);
2267 net_err_ratelimited("ARP packet allocation failed\n");
2271 if (!tags || tags->vlan_proto == VLAN_N_VID)
2276 /* Go through all the tags backwards and add them to the packet */
2277 while (tags->vlan_proto != VLAN_N_VID) {
2278 if (!tags->vlan_id) {
2283 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2284 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2285 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2288 net_err_ratelimited("failed to insert inner VLAN tag\n");
2294 /* Set the outer tag */
2295 if (outer_tag->vlan_id) {
2296 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2297 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2298 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2299 outer_tag->vlan_id);
2306 /* Validate the device path between the @start_dev and the @end_dev.
2307 * The path is valid if the @end_dev is reachable through device
2309 * When the path is validated, collect any vlan information in the
2312 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2313 struct net_device *end_dev,
2316 struct bond_vlan_tag *tags;
2317 struct net_device *upper;
2318 struct list_head *iter;
2320 if (start_dev == end_dev) {
2321 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2323 return ERR_PTR(-ENOMEM);
2324 tags[level].vlan_proto = VLAN_N_VID;
2328 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2329 tags = bond_verify_device_path(upper, end_dev, level + 1);
2330 if (IS_ERR_OR_NULL(tags)) {
2335 if (is_vlan_dev(upper)) {
2336 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2337 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2346 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2349 struct bond_vlan_tag *tags;
2350 __be32 *targets = bond->params.arp_targets, addr;
2353 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2354 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2357 /* Find out through which dev should the packet go */
2358 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2361 /* there's no route to target - try to send arp
2362 * probe to generate any traffic (arp_validate=0)
2364 if (bond->params.arp_validate)
2365 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2368 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2373 /* bond device itself */
2374 if (rt->dst.dev == bond->dev)
2378 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2381 if (!IS_ERR_OR_NULL(tags))
2384 /* Not our device - skip */
2385 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2386 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2392 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2394 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2400 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2404 if (!sip || !bond_has_this_ip(bond, tip)) {
2405 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2410 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2412 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2416 slave->last_rx = jiffies;
2417 slave->target_last_arp_rx[i] = jiffies;
2420 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2421 struct slave *slave)
2423 struct arphdr *arp = (struct arphdr *)skb->data;
2424 struct slave *curr_active_slave, *curr_arp_slave;
2425 unsigned char *arp_ptr;
2427 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2429 if (!slave_do_arp_validate(bond, slave)) {
2430 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2431 !slave_do_arp_validate_only(bond))
2432 slave->last_rx = jiffies;
2433 return RX_HANDLER_ANOTHER;
2434 } else if (!is_arp) {
2435 return RX_HANDLER_ANOTHER;
2438 alen = arp_hdr_len(bond->dev);
2440 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2443 if (alen > skb_headlen(skb)) {
2444 arp = kmalloc(alen, GFP_ATOMIC);
2447 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2451 if (arp->ar_hln != bond->dev->addr_len ||
2452 skb->pkt_type == PACKET_OTHERHOST ||
2453 skb->pkt_type == PACKET_LOOPBACK ||
2454 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2455 arp->ar_pro != htons(ETH_P_IP) ||
2459 arp_ptr = (unsigned char *)(arp + 1);
2460 arp_ptr += bond->dev->addr_len;
2461 memcpy(&sip, arp_ptr, 4);
2462 arp_ptr += 4 + bond->dev->addr_len;
2463 memcpy(&tip, arp_ptr, 4);
2465 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2466 slave->dev->name, bond_slave_state(slave),
2467 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2470 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2471 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2473 /* We 'trust' the received ARP enough to validate it if:
2475 * (a) the slave receiving the ARP is active (which includes the
2476 * current ARP slave, if any), or
2478 * (b) the receiving slave isn't active, but there is a currently
2479 * active slave and it received valid arp reply(s) after it became
2480 * the currently active slave, or
2482 * (c) there is an ARP slave that sent an ARP during the prior ARP
2483 * interval, and we receive an ARP reply on any slave. We accept
2484 * these because switch FDB update delays may deliver the ARP
2485 * reply to a slave other than the sender of the ARP request.
2487 * Note: for (b), backup slaves are receiving the broadcast ARP
2488 * request, not a reply. This request passes from the sending
2489 * slave through the L2 switch(es) to the receiving slave. Since
2490 * this is checking the request, sip/tip are swapped for
2493 * This is done to avoid endless looping when we can't reach the
2494 * arp_ip_target and fool ourselves with our own arp requests.
2496 if (bond_is_active_slave(slave))
2497 bond_validate_arp(bond, slave, sip, tip);
2498 else if (curr_active_slave &&
2499 time_after(slave_last_rx(bond, curr_active_slave),
2500 curr_active_slave->last_link_up))
2501 bond_validate_arp(bond, slave, tip, sip);
2502 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2503 bond_time_in_interval(bond,
2504 dev_trans_start(curr_arp_slave->dev), 1))
2505 bond_validate_arp(bond, slave, sip, tip);
2508 if (arp != (struct arphdr *)skb->data)
2510 return RX_HANDLER_ANOTHER;
2513 /* function to verify if we're in the arp_interval timeslice, returns true if
2514 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2515 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2517 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2520 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2522 return time_in_range(jiffies,
2523 last_act - delta_in_ticks,
2524 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2527 /* This function is called regularly to monitor each slave's link
2528 * ensuring that traffic is being sent and received when arp monitoring
2529 * is used in load-balancing mode. if the adapter has been dormant, then an
2530 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2531 * arp monitoring in active backup mode.
2533 static void bond_loadbalance_arp_mon(struct work_struct *work)
2535 struct bonding *bond = container_of(work, struct bonding,
2537 struct slave *slave, *oldcurrent;
2538 struct list_head *iter;
2539 int do_failover = 0, slave_state_changed = 0;
2541 if (!bond_has_slaves(bond))
2546 oldcurrent = rcu_dereference(bond->curr_active_slave);
2547 /* see if any of the previous devices are up now (i.e. they have
2548 * xmt and rcv traffic). the curr_active_slave does not come into
2549 * the picture unless it is null. also, slave->last_link_up is not
2550 * needed here because we send an arp on each slave and give a slave
2551 * as long as it needs to get the tx/rx within the delta.
2552 * TODO: what about up/down delay in arp mode? it wasn't here before
2555 bond_for_each_slave_rcu(bond, slave, iter) {
2556 unsigned long trans_start = dev_trans_start(slave->dev);
2558 if (slave->link != BOND_LINK_UP) {
2559 if (bond_time_in_interval(bond, trans_start, 1) &&
2560 bond_time_in_interval(bond, slave->last_rx, 1)) {
2562 slave->link = BOND_LINK_UP;
2563 slave_state_changed = 1;
2565 /* primary_slave has no meaning in round-robin
2566 * mode. the window of a slave being up and
2567 * curr_active_slave being null after enslaving
2571 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2575 netdev_info(bond->dev, "interface %s is now up\n",
2580 /* slave->link == BOND_LINK_UP */
2582 /* not all switches will respond to an arp request
2583 * when the source ip is 0, so don't take the link down
2584 * if we don't know our ip yet
2586 if (!bond_time_in_interval(bond, trans_start, 2) ||
2587 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2589 slave->link = BOND_LINK_DOWN;
2590 slave_state_changed = 1;
2592 if (slave->link_failure_count < UINT_MAX)
2593 slave->link_failure_count++;
2595 netdev_info(bond->dev, "interface %s is now down\n",
2598 if (slave == oldcurrent)
2603 /* note: if switch is in round-robin mode, all links
2604 * must tx arp to ensure all links rx an arp - otherwise
2605 * links may oscillate or not come up at all; if switch is
2606 * in something like xor mode, there is nothing we can
2607 * do - all replies will be rx'ed on same link causing slaves
2608 * to be unstable during low/no traffic periods
2610 if (bond_slave_is_up(slave))
2611 bond_arp_send_all(bond, slave);
2616 if (do_failover || slave_state_changed) {
2617 if (!rtnl_trylock())
2620 if (slave_state_changed) {
2621 bond_slave_state_change(bond);
2622 if (BOND_MODE(bond) == BOND_MODE_XOR)
2623 bond_update_slave_arr(bond, NULL);
2627 bond_select_active_slave(bond);
2628 unblock_netpoll_tx();
2634 if (bond->params.arp_interval)
2635 queue_delayed_work(bond->wq, &bond->arp_work,
2636 msecs_to_jiffies(bond->params.arp_interval));
2639 /* Called to inspect slaves for active-backup mode ARP monitor link state
2640 * changes. Sets new_link in slaves to specify what action should take
2641 * place for the slave. Returns 0 if no changes are found, >0 if changes
2642 * to link states must be committed.
2644 * Called with rcu_read_lock held.
2646 static int bond_ab_arp_inspect(struct bonding *bond)
2648 unsigned long trans_start, last_rx;
2649 struct list_head *iter;
2650 struct slave *slave;
2653 bond_for_each_slave_rcu(bond, slave, iter) {
2654 slave->new_link = BOND_LINK_NOCHANGE;
2655 last_rx = slave_last_rx(bond, slave);
2657 if (slave->link != BOND_LINK_UP) {
2658 if (bond_time_in_interval(bond, last_rx, 1)) {
2659 slave->new_link = BOND_LINK_UP;
2665 /* Give slaves 2*delta after being enslaved or made
2666 * active. This avoids bouncing, as the last receive
2667 * times need a full ARP monitor cycle to be updated.
2669 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2672 /* Backup slave is down if:
2673 * - No current_arp_slave AND
2674 * - more than 3*delta since last receive AND
2675 * - the bond has an IP address
2677 * Note: a non-null current_arp_slave indicates
2678 * the curr_active_slave went down and we are
2679 * searching for a new one; under this condition
2680 * we only take the curr_active_slave down - this
2681 * gives each slave a chance to tx/rx traffic
2682 * before being taken out
2684 if (!bond_is_active_slave(slave) &&
2685 !rcu_access_pointer(bond->current_arp_slave) &&
2686 !bond_time_in_interval(bond, last_rx, 3)) {
2687 slave->new_link = BOND_LINK_DOWN;
2691 /* Active slave is down if:
2692 * - more than 2*delta since transmitting OR
2693 * - (more than 2*delta since receive AND
2694 * the bond has an IP address)
2696 trans_start = dev_trans_start(slave->dev);
2697 if (bond_is_active_slave(slave) &&
2698 (!bond_time_in_interval(bond, trans_start, 2) ||
2699 !bond_time_in_interval(bond, last_rx, 2))) {
2700 slave->new_link = BOND_LINK_DOWN;
2708 /* Called to commit link state changes noted by inspection step of
2709 * active-backup mode ARP monitor.
2711 * Called with RTNL hold.
2713 static void bond_ab_arp_commit(struct bonding *bond)
2715 unsigned long trans_start;
2716 struct list_head *iter;
2717 struct slave *slave;
2719 bond_for_each_slave(bond, slave, iter) {
2720 switch (slave->new_link) {
2721 case BOND_LINK_NOCHANGE:
2725 trans_start = dev_trans_start(slave->dev);
2726 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2727 (!rtnl_dereference(bond->curr_active_slave) &&
2728 bond_time_in_interval(bond, trans_start, 1))) {
2729 struct slave *current_arp_slave;
2731 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2732 bond_set_slave_link_state(slave, BOND_LINK_UP);
2733 if (current_arp_slave) {
2734 bond_set_slave_inactive_flags(
2736 BOND_SLAVE_NOTIFY_NOW);
2737 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2740 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2743 if (!rtnl_dereference(bond->curr_active_slave) ||
2744 slave == rtnl_dereference(bond->primary_slave))
2751 case BOND_LINK_DOWN:
2752 if (slave->link_failure_count < UINT_MAX)
2753 slave->link_failure_count++;
2755 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2756 bond_set_slave_inactive_flags(slave,
2757 BOND_SLAVE_NOTIFY_NOW);
2759 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2762 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2763 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2770 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2771 slave->new_link, slave->dev->name);
2777 bond_select_active_slave(bond);
2778 unblock_netpoll_tx();
2781 bond_set_carrier(bond);
2784 /* Send ARP probes for active-backup mode ARP monitor.
2786 * Called with rcu_read_lock held.
2788 static bool bond_ab_arp_probe(struct bonding *bond)
2790 struct slave *slave, *before = NULL, *new_slave = NULL,
2791 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2792 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2793 struct list_head *iter;
2795 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2797 if (curr_arp_slave && curr_active_slave)
2798 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2799 curr_arp_slave->dev->name,
2800 curr_active_slave->dev->name);
2802 if (curr_active_slave) {
2803 bond_arp_send_all(bond, curr_active_slave);
2804 return should_notify_rtnl;
2807 /* if we don't have a curr_active_slave, search for the next available
2808 * backup slave from the current_arp_slave and make it the candidate
2809 * for becoming the curr_active_slave
2812 if (!curr_arp_slave) {
2813 curr_arp_slave = bond_first_slave_rcu(bond);
2814 if (!curr_arp_slave)
2815 return should_notify_rtnl;
2818 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2820 bond_for_each_slave_rcu(bond, slave, iter) {
2821 if (!found && !before && bond_slave_is_up(slave))
2824 if (found && !new_slave && bond_slave_is_up(slave))
2826 /* if the link state is up at this point, we
2827 * mark it down - this can happen if we have
2828 * simultaneous link failures and
2829 * reselect_active_interface doesn't make this
2830 * one the current slave so it is still marked
2831 * up when it is actually down
2833 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2834 bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2835 if (slave->link_failure_count < UINT_MAX)
2836 slave->link_failure_count++;
2838 bond_set_slave_inactive_flags(slave,
2839 BOND_SLAVE_NOTIFY_LATER);
2841 netdev_info(bond->dev, "backup interface %s is now down\n",
2844 if (slave == curr_arp_slave)
2848 if (!new_slave && before)
2854 bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2855 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2856 bond_arp_send_all(bond, new_slave);
2857 new_slave->last_link_up = jiffies;
2858 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2861 bond_for_each_slave_rcu(bond, slave, iter) {
2862 if (slave->should_notify) {
2863 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2867 return should_notify_rtnl;
2870 static void bond_activebackup_arp_mon(struct work_struct *work)
2872 struct bonding *bond = container_of(work, struct bonding,
2874 bool should_notify_peers = false;
2875 bool should_notify_rtnl = false;
2878 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2880 if (!bond_has_slaves(bond))
2885 should_notify_peers = bond_should_notify_peers(bond);
2887 if (bond_ab_arp_inspect(bond)) {
2890 /* Race avoidance with bond_close flush of workqueue */
2891 if (!rtnl_trylock()) {
2893 should_notify_peers = false;
2897 bond_ab_arp_commit(bond);
2903 should_notify_rtnl = bond_ab_arp_probe(bond);
2907 if (bond->params.arp_interval)
2908 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2910 if (should_notify_peers || should_notify_rtnl) {
2911 if (!rtnl_trylock())
2914 if (should_notify_peers)
2915 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2917 if (should_notify_rtnl)
2918 bond_slave_state_notify(bond);
2924 /*-------------------------- netdev event handling --------------------------*/
2926 /* Change device name */
2927 static int bond_event_changename(struct bonding *bond)
2929 bond_remove_proc_entry(bond);
2930 bond_create_proc_entry(bond);
2932 bond_debug_reregister(bond);
2937 static int bond_master_netdev_event(unsigned long event,
2938 struct net_device *bond_dev)
2940 struct bonding *event_bond = netdev_priv(bond_dev);
2943 case NETDEV_CHANGENAME:
2944 return bond_event_changename(event_bond);
2945 case NETDEV_UNREGISTER:
2946 bond_remove_proc_entry(event_bond);
2948 case NETDEV_REGISTER:
2949 bond_create_proc_entry(event_bond);
2951 case NETDEV_NOTIFY_PEERS:
2952 if (event_bond->send_peer_notif)
2953 event_bond->send_peer_notif--;
2962 static int bond_slave_netdev_event(unsigned long event,
2963 struct net_device *slave_dev)
2965 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2966 struct bonding *bond;
2967 struct net_device *bond_dev;
2969 /* A netdev event can be generated while enslaving a device
2970 * before netdev_rx_handler_register is called in which case
2971 * slave will be NULL
2975 bond_dev = slave->bond->dev;
2977 primary = rtnl_dereference(bond->primary_slave);
2980 case NETDEV_UNREGISTER:
2981 if (bond_dev->type != ARPHRD_ETHER)
2982 bond_release_and_destroy(bond_dev, slave_dev);
2984 bond_release(bond_dev, slave_dev);
2988 bond_update_speed_duplex(slave);
2989 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2990 bond_3ad_adapter_speed_duplex_changed(slave);
2993 /* Refresh slave-array if applicable!
2994 * If the setup does not use miimon or arpmon (mode-specific!),
2995 * then these events will not cause the slave-array to be
2996 * refreshed. This will cause xmit to use a slave that is not
2997 * usable. Avoid such situation by refeshing the array at these
2998 * events. If these (miimon/arpmon) parameters are configured
2999 * then array gets refreshed twice and that should be fine!
3001 if (bond_mode_uses_xmit_hash(bond))
3002 bond_update_slave_arr(bond, NULL);
3004 case NETDEV_CHANGEMTU:
3005 /* TODO: Should slaves be allowed to
3006 * independently alter their MTU? For
3007 * an active-backup bond, slaves need
3008 * not be the same type of device, so
3009 * MTUs may vary. For other modes,
3010 * slaves arguably should have the
3011 * same MTUs. To do this, we'd need to
3012 * take over the slave's change_mtu
3013 * function for the duration of their
3017 case NETDEV_CHANGENAME:
3018 /* we don't care if we don't have primary set */
3019 if (!bond_uses_primary(bond) ||
3020 !bond->params.primary[0])
3023 if (slave == primary) {
3024 /* slave's name changed - he's no longer primary */
3025 RCU_INIT_POINTER(bond->primary_slave, NULL);
3026 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3027 /* we have a new primary slave */
3028 rcu_assign_pointer(bond->primary_slave, slave);
3029 } else { /* we didn't change primary - exit */
3033 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3034 primary ? slave_dev->name : "none");
3037 bond_select_active_slave(bond);
3038 unblock_netpoll_tx();
3040 case NETDEV_FEAT_CHANGE:
3041 bond_compute_features(bond);
3043 case NETDEV_RESEND_IGMP:
3044 /* Propagate to master device */
3045 call_netdevice_notifiers(event, slave->bond->dev);
3054 /* bond_netdev_event: handle netdev notifier chain events.
3056 * This function receives events for the netdev chain. The caller (an
3057 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3058 * locks for us to safely manipulate the slave devices (RTNL lock,
3061 static int bond_netdev_event(struct notifier_block *this,
3062 unsigned long event, void *ptr)
3064 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3066 netdev_dbg(event_dev, "event: %lx\n", event);
3068 if (!(event_dev->priv_flags & IFF_BONDING))
3071 if (event_dev->flags & IFF_MASTER) {
3072 netdev_dbg(event_dev, "IFF_MASTER\n");
3073 return bond_master_netdev_event(event, event_dev);
3076 if (event_dev->flags & IFF_SLAVE) {
3077 netdev_dbg(event_dev, "IFF_SLAVE\n");
3078 return bond_slave_netdev_event(event, event_dev);
3084 static struct notifier_block bond_netdev_notifier = {
3085 .notifier_call = bond_netdev_event,
3088 /*---------------------------- Hashing Policies -----------------------------*/
3090 /* L2 hash helper */
3091 static inline u32 bond_eth_hash(struct sk_buff *skb)
3093 struct ethhdr *ep, hdr_tmp;
3095 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3097 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3101 /* Extract the appropriate headers based on bond's xmit policy */
3102 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3103 struct flow_keys *fk)
3105 const struct ipv6hdr *iph6;
3106 const struct iphdr *iph;
3107 int noff, proto = -1;
3109 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3110 return skb_flow_dissect_flow_keys(skb, fk, 0);
3112 fk->ports.ports = 0;
3113 noff = skb_network_offset(skb);
3114 if (skb->protocol == htons(ETH_P_IP)) {
3115 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3118 iph_to_flow_copy_v4addrs(fk, iph);
3119 noff += iph->ihl << 2;
3120 if (!ip_is_fragment(iph))
3121 proto = iph->protocol;
3122 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3123 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3125 iph6 = ipv6_hdr(skb);
3126 iph_to_flow_copy_v6addrs(fk, iph6);
3127 noff += sizeof(*iph6);
3128 proto = iph6->nexthdr;
3132 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3133 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3139 * bond_xmit_hash - generate a hash value based on the xmit policy
3140 * @bond: bonding device
3141 * @skb: buffer to use for headers
3143 * This function will extract the necessary headers from the skb buffer and use
3144 * them to generate a hash based on the xmit_policy set in the bonding device
3146 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3148 struct flow_keys flow;
3151 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3155 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3156 !bond_flow_dissect(bond, skb, &flow))
3157 return bond_eth_hash(skb);
3159 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3160 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3161 hash = bond_eth_hash(skb);
3163 hash = (__force u32)flow.ports.ports;
3164 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3165 (__force u32)flow_get_u32_src(&flow);
3166 hash ^= (hash >> 16);
3167 hash ^= (hash >> 8);
3172 /*-------------------------- Device entry points ----------------------------*/
3174 static void bond_work_init_all(struct bonding *bond)
3176 INIT_DELAYED_WORK(&bond->mcast_work,
3177 bond_resend_igmp_join_requests_delayed);
3178 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3179 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3180 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3181 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3183 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3184 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3185 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3188 static void bond_work_cancel_all(struct bonding *bond)
3190 cancel_delayed_work_sync(&bond->mii_work);
3191 cancel_delayed_work_sync(&bond->arp_work);
3192 cancel_delayed_work_sync(&bond->alb_work);
3193 cancel_delayed_work_sync(&bond->ad_work);
3194 cancel_delayed_work_sync(&bond->mcast_work);
3195 cancel_delayed_work_sync(&bond->slave_arr_work);
3198 static int bond_open(struct net_device *bond_dev)
3200 struct bonding *bond = netdev_priv(bond_dev);
3201 struct list_head *iter;
3202 struct slave *slave;
3204 /* reset slave->backup and slave->inactive */
3205 if (bond_has_slaves(bond)) {
3206 bond_for_each_slave(bond, slave, iter) {
3207 if (bond_uses_primary(bond) &&
3208 slave != rcu_access_pointer(bond->curr_active_slave)) {
3209 bond_set_slave_inactive_flags(slave,
3210 BOND_SLAVE_NOTIFY_NOW);
3211 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3212 bond_set_slave_active_flags(slave,
3213 BOND_SLAVE_NOTIFY_NOW);
3218 bond_work_init_all(bond);
3220 if (bond_is_lb(bond)) {
3221 /* bond_alb_initialize must be called before the timer
3224 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3226 if (bond->params.tlb_dynamic_lb)
3227 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3230 if (bond->params.miimon) /* link check interval, in milliseconds. */
3231 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3233 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3234 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3235 bond->recv_probe = bond_arp_rcv;
3238 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3239 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3240 /* register to receive LACPDUs */
3241 bond->recv_probe = bond_3ad_lacpdu_recv;
3242 bond_3ad_initiate_agg_selection(bond, 1);
3245 if (bond_mode_uses_xmit_hash(bond))
3246 bond_update_slave_arr(bond, NULL);
3251 static int bond_close(struct net_device *bond_dev)
3253 struct bonding *bond = netdev_priv(bond_dev);
3255 bond_work_cancel_all(bond);
3256 bond->send_peer_notif = 0;
3257 if (bond_is_lb(bond))
3258 bond_alb_deinitialize(bond);
3259 bond->recv_probe = NULL;
3264 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3265 * that some drivers can provide 32bit values only.
3267 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3268 const struct rtnl_link_stats64 *_new,
3269 const struct rtnl_link_stats64 *_old)
3271 const u64 *new = (const u64 *)_new;
3272 const u64 *old = (const u64 *)_old;
3273 u64 *res = (u64 *)_res;
3276 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3280 /* detects if this particular field is 32bit only */
3281 if (((nv | ov) >> 32) == 0)
3282 res[i] += (u32)nv - (u32)ov;
3288 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3289 struct rtnl_link_stats64 *stats)
3291 struct bonding *bond = netdev_priv(bond_dev);
3292 struct rtnl_link_stats64 temp;
3293 struct list_head *iter;
3294 struct slave *slave;
3296 spin_lock(&bond->stats_lock);
3297 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3300 bond_for_each_slave_rcu(bond, slave, iter) {
3301 const struct rtnl_link_stats64 *new =
3302 dev_get_stats(slave->dev, &temp);
3304 bond_fold_stats(stats, new, &slave->slave_stats);
3306 /* save off the slave stats for the next run */
3307 memcpy(&slave->slave_stats, new, sizeof(*new));
3311 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3312 spin_unlock(&bond->stats_lock);
3317 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3319 struct bonding *bond = netdev_priv(bond_dev);
3320 struct net_device *slave_dev = NULL;
3321 struct ifbond k_binfo;
3322 struct ifbond __user *u_binfo = NULL;
3323 struct ifslave k_sinfo;
3324 struct ifslave __user *u_sinfo = NULL;
3325 struct mii_ioctl_data *mii = NULL;
3326 struct bond_opt_value newval;
3330 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3341 /* We do this again just in case we were called by SIOCGMIIREG
3342 * instead of SIOCGMIIPHY.
3348 if (mii->reg_num == 1) {
3350 if (netif_carrier_ok(bond->dev))
3351 mii->val_out = BMSR_LSTATUS;
3355 case BOND_INFO_QUERY_OLD:
3356 case SIOCBONDINFOQUERY:
3357 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3359 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3362 res = bond_info_query(bond_dev, &k_binfo);
3364 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3368 case BOND_SLAVE_INFO_QUERY_OLD:
3369 case SIOCBONDSLAVEINFOQUERY:
3370 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3372 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3375 res = bond_slave_info_query(bond_dev, &k_sinfo);
3377 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3385 net = dev_net(bond_dev);
3387 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3390 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3392 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3397 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3399 case BOND_ENSLAVE_OLD:
3400 case SIOCBONDENSLAVE:
3401 res = bond_enslave(bond_dev, slave_dev);
3403 case BOND_RELEASE_OLD:
3404 case SIOCBONDRELEASE:
3405 res = bond_release(bond_dev, slave_dev);
3407 case BOND_SETHWADDR_OLD:
3408 case SIOCBONDSETHWADDR:
3409 bond_set_dev_addr(bond_dev, slave_dev);
3412 case BOND_CHANGE_ACTIVE_OLD:
3413 case SIOCBONDCHANGEACTIVE:
3414 bond_opt_initstr(&newval, slave_dev->name);
3415 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3424 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3426 struct bonding *bond = netdev_priv(bond_dev);
3428 if (change & IFF_PROMISC)
3429 bond_set_promiscuity(bond,
3430 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3432 if (change & IFF_ALLMULTI)
3433 bond_set_allmulti(bond,
3434 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3437 static void bond_set_rx_mode(struct net_device *bond_dev)
3439 struct bonding *bond = netdev_priv(bond_dev);
3440 struct list_head *iter;
3441 struct slave *slave;
3444 if (bond_uses_primary(bond)) {
3445 slave = rcu_dereference(bond->curr_active_slave);
3447 dev_uc_sync(slave->dev, bond_dev);
3448 dev_mc_sync(slave->dev, bond_dev);
3451 bond_for_each_slave_rcu(bond, slave, iter) {
3452 dev_uc_sync_multiple(slave->dev, bond_dev);
3453 dev_mc_sync_multiple(slave->dev, bond_dev);
3459 static int bond_neigh_init(struct neighbour *n)
3461 struct bonding *bond = netdev_priv(n->dev);
3462 const struct net_device_ops *slave_ops;
3463 struct neigh_parms parms;
3464 struct slave *slave;
3467 slave = bond_first_slave(bond);
3470 slave_ops = slave->dev->netdev_ops;
3471 if (!slave_ops->ndo_neigh_setup)
3474 parms.neigh_setup = NULL;
3475 parms.neigh_cleanup = NULL;
3476 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3480 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3481 * after the last slave has been detached. Assumes that all slaves
3482 * utilize the same neigh_cleanup (true at this writing as only user
3485 n->parms->neigh_cleanup = parms.neigh_cleanup;
3487 if (!parms.neigh_setup)
3490 return parms.neigh_setup(n);
3493 /* The bonding ndo_neigh_setup is called at init time beofre any
3494 * slave exists. So we must declare proxy setup function which will
3495 * be used at run time to resolve the actual slave neigh param setup.
3497 * It's also called by master devices (such as vlans) to setup their
3498 * underlying devices. In that case - do nothing, we're already set up from
3501 static int bond_neigh_setup(struct net_device *dev,
3502 struct neigh_parms *parms)
3504 /* modify only our neigh_parms */
3505 if (parms->dev == dev)
3506 parms->neigh_setup = bond_neigh_init;
3511 /* Change the MTU of all of a master's slaves to match the master */
3512 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3514 struct bonding *bond = netdev_priv(bond_dev);
3515 struct slave *slave, *rollback_slave;
3516 struct list_head *iter;
3519 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3521 bond_for_each_slave(bond, slave, iter) {
3522 netdev_dbg(bond_dev, "s %p c_m %p\n",
3523 slave, slave->dev->netdev_ops->ndo_change_mtu);
3525 res = dev_set_mtu(slave->dev, new_mtu);
3528 /* If we failed to set the slave's mtu to the new value
3529 * we must abort the operation even in ACTIVE_BACKUP
3530 * mode, because if we allow the backup slaves to have
3531 * different mtu values than the active slave we'll
3532 * need to change their mtu when doing a failover. That
3533 * means changing their mtu from timer context, which
3534 * is probably not a good idea.
3536 netdev_dbg(bond_dev, "err %d %s\n", res,
3542 bond_dev->mtu = new_mtu;
3547 /* unwind from head to the slave that failed */
3548 bond_for_each_slave(bond, rollback_slave, iter) {
3551 if (rollback_slave == slave)
3554 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3556 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3557 tmp_res, rollback_slave->dev->name);
3564 /* Change HW address
3566 * Note that many devices must be down to change the HW address, and
3567 * downing the master releases all slaves. We can make bonds full of
3568 * bonding devices to test this, however.
3570 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3572 struct bonding *bond = netdev_priv(bond_dev);
3573 struct slave *slave, *rollback_slave;
3574 struct sockaddr *sa = addr, tmp_sa;
3575 struct list_head *iter;
3578 if (BOND_MODE(bond) == BOND_MODE_ALB)
3579 return bond_alb_set_mac_address(bond_dev, addr);
3582 netdev_dbg(bond_dev, "bond=%p\n", bond);
3584 /* If fail_over_mac is enabled, do nothing and return success.
3585 * Returning an error causes ifenslave to fail.
3587 if (bond->params.fail_over_mac &&
3588 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3591 if (!is_valid_ether_addr(sa->sa_data))
3592 return -EADDRNOTAVAIL;
3594 bond_for_each_slave(bond, slave, iter) {
3595 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3596 res = dev_set_mac_address(slave->dev, addr);
3598 /* TODO: consider downing the slave
3600 * User should expect communications
3601 * breakage anyway until ARP finish
3604 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3610 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3614 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3615 tmp_sa.sa_family = bond_dev->type;
3617 /* unwind from head to the slave that failed */
3618 bond_for_each_slave(bond, rollback_slave, iter) {
3621 if (rollback_slave == slave)
3624 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3626 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3627 tmp_res, rollback_slave->dev->name);
3635 * bond_xmit_slave_id - transmit skb through slave with slave_id
3636 * @bond: bonding device that is transmitting
3637 * @skb: buffer to transmit
3638 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3640 * This function tries to transmit through slave with slave_id but in case
3641 * it fails, it tries to find the first available slave for transmission.
3642 * The skb is consumed in all cases, thus the function is void.
3644 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3646 struct list_head *iter;
3647 struct slave *slave;
3650 /* Here we start from the slave with slave_id */
3651 bond_for_each_slave_rcu(bond, slave, iter) {
3653 if (bond_slave_can_tx(slave)) {
3654 bond_dev_queue_xmit(bond, skb, slave->dev);
3660 /* Here we start from the first slave up to slave_id */
3662 bond_for_each_slave_rcu(bond, slave, iter) {
3665 if (bond_slave_can_tx(slave)) {
3666 bond_dev_queue_xmit(bond, skb, slave->dev);
3670 /* no slave that can tx has been found */
3671 bond_tx_drop(bond->dev, skb);
3675 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3676 * @bond: bonding device to use
3678 * Based on the value of the bonding device's packets_per_slave parameter
3679 * this function generates a slave id, which is usually used as the next
3680 * slave to transmit through.
3682 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3685 struct reciprocal_value reciprocal_packets_per_slave;
3686 int packets_per_slave = bond->params.packets_per_slave;
3688 switch (packets_per_slave) {
3690 slave_id = prandom_u32();
3693 slave_id = bond->rr_tx_counter;
3696 reciprocal_packets_per_slave =
3697 bond->params.reciprocal_packets_per_slave;
3698 slave_id = reciprocal_divide(bond->rr_tx_counter,
3699 reciprocal_packets_per_slave);
3702 bond->rr_tx_counter++;
3707 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3709 struct bonding *bond = netdev_priv(bond_dev);
3710 struct iphdr *iph = ip_hdr(skb);
3711 struct slave *slave;
3714 /* Start with the curr_active_slave that joined the bond as the
3715 * default for sending IGMP traffic. For failover purposes one
3716 * needs to maintain some consistency for the interface that will
3717 * send the join/membership reports. The curr_active_slave found
3718 * will send all of this type of traffic.
3720 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3721 slave = rcu_dereference(bond->curr_active_slave);
3723 bond_dev_queue_xmit(bond, skb, slave->dev);
3725 bond_xmit_slave_id(bond, skb, 0);
3727 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3729 if (likely(slave_cnt)) {
3730 slave_id = bond_rr_gen_slave_id(bond);
3731 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3733 bond_tx_drop(bond_dev, skb);
3737 return NETDEV_TX_OK;
3740 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3741 * the bond has a usable interface.
3743 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3745 struct bonding *bond = netdev_priv(bond_dev);
3746 struct slave *slave;
3748 slave = rcu_dereference(bond->curr_active_slave);
3750 bond_dev_queue_xmit(bond, skb, slave->dev);
3752 bond_tx_drop(bond_dev, skb);
3754 return NETDEV_TX_OK;
3757 /* Use this to update slave_array when (a) it's not appropriate to update
3758 * slave_array right away (note that update_slave_array() may sleep)
3759 * and / or (b) RTNL is not held.
3761 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3763 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3766 /* Slave array work handler. Holds only RTNL */
3767 static void bond_slave_arr_handler(struct work_struct *work)
3769 struct bonding *bond = container_of(work, struct bonding,
3770 slave_arr_work.work);
3773 if (!rtnl_trylock())
3776 ret = bond_update_slave_arr(bond, NULL);
3779 pr_warn_ratelimited("Failed to update slave array from WT\n");
3785 bond_slave_arr_work_rearm(bond, 1);
3788 /* Build the usable slaves array in control path for modes that use xmit-hash
3789 * to determine the slave interface -
3790 * (a) BOND_MODE_8023AD
3792 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3794 * The caller is expected to hold RTNL only and NO other lock!
3796 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3798 struct slave *slave;
3799 struct list_head *iter;
3800 struct bond_up_slave *new_arr, *old_arr;
3804 #ifdef CONFIG_LOCKDEP
3805 WARN_ON(lockdep_is_held(&bond->mode_lock));
3808 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3812 pr_err("Failed to build slave-array.\n");
3815 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3816 struct ad_info ad_info;
3818 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3819 pr_debug("bond_3ad_get_active_agg_info failed\n");
3820 kfree_rcu(new_arr, rcu);
3821 /* No active aggragator means it's not safe to use
3822 * the previous array.
3824 old_arr = rtnl_dereference(bond->slave_arr);
3826 RCU_INIT_POINTER(bond->slave_arr, NULL);
3827 kfree_rcu(old_arr, rcu);
3831 agg_id = ad_info.aggregator_id;
3833 bond_for_each_slave(bond, slave, iter) {
3834 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3835 struct aggregator *agg;
3837 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3838 if (!agg || agg->aggregator_identifier != agg_id)
3841 if (!bond_slave_can_tx(slave))
3843 if (skipslave == slave)
3845 new_arr->arr[new_arr->count++] = slave;
3848 old_arr = rtnl_dereference(bond->slave_arr);
3849 rcu_assign_pointer(bond->slave_arr, new_arr);
3851 kfree_rcu(old_arr, rcu);
3853 if (ret != 0 && skipslave) {
3856 /* Rare situation where caller has asked to skip a specific
3857 * slave but allocation failed (most likely!). BTW this is
3858 * only possible when the call is initiated from
3859 * __bond_release_one(). In this situation; overwrite the
3860 * skipslave entry in the array with the last entry from the
3861 * array to avoid a situation where the xmit path may choose
3862 * this to-be-skipped slave to send a packet out.
3864 old_arr = rtnl_dereference(bond->slave_arr);
3865 for (idx = 0; idx < old_arr->count; idx++) {
3866 if (skipslave == old_arr->arr[idx]) {
3868 old_arr->arr[old_arr->count-1];
3877 /* Use this Xmit function for 3AD as well as XOR modes. The current
3878 * usable slave array is formed in the control path. The xmit function
3879 * just calculates hash and sends the packet out.
3881 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3883 struct bonding *bond = netdev_priv(dev);
3884 struct slave *slave;
3885 struct bond_up_slave *slaves;
3888 slaves = rcu_dereference(bond->slave_arr);
3889 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3890 if (likely(count)) {
3891 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3892 bond_dev_queue_xmit(bond, skb, slave->dev);
3894 bond_tx_drop(dev, skb);
3897 return NETDEV_TX_OK;
3900 /* in broadcast mode, we send everything to all usable interfaces. */
3901 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3903 struct bonding *bond = netdev_priv(bond_dev);
3904 struct slave *slave = NULL;
3905 struct list_head *iter;
3907 bond_for_each_slave_rcu(bond, slave, iter) {
3908 if (bond_is_last_slave(bond, slave))
3910 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3911 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3914 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3915 bond_dev->name, __func__);
3918 bond_dev_queue_xmit(bond, skb2, slave->dev);
3921 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3922 bond_dev_queue_xmit(bond, skb, slave->dev);
3924 bond_tx_drop(bond_dev, skb);
3926 return NETDEV_TX_OK;
3929 /*------------------------- Device initialization ---------------------------*/
3931 /* Lookup the slave that corresponds to a qid */
3932 static inline int bond_slave_override(struct bonding *bond,
3933 struct sk_buff *skb)
3935 struct slave *slave = NULL;
3936 struct list_head *iter;
3938 if (!skb->queue_mapping)
3941 /* Find out if any slaves have the same mapping as this skb. */
3942 bond_for_each_slave_rcu(bond, slave, iter) {
3943 if (slave->queue_id == skb->queue_mapping) {
3944 if (bond_slave_is_up(slave) &&
3945 slave->link == BOND_LINK_UP) {
3946 bond_dev_queue_xmit(bond, skb, slave->dev);
3949 /* If the slave isn't UP, use default transmit policy. */
3958 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3959 void *accel_priv, select_queue_fallback_t fallback)
3961 /* This helper function exists to help dev_pick_tx get the correct
3962 * destination queue. Using a helper function skips a call to
3963 * skb_tx_hash and will put the skbs in the queue we expect on their
3964 * way down to the bonding driver.
3966 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3968 /* Save the original txq to restore before passing to the driver */
3969 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3971 if (unlikely(txq >= dev->real_num_tx_queues)) {
3973 txq -= dev->real_num_tx_queues;
3974 } while (txq >= dev->real_num_tx_queues);
3979 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3981 struct bonding *bond = netdev_priv(dev);
3983 if (bond_should_override_tx_queue(bond) &&
3984 !bond_slave_override(bond, skb))
3985 return NETDEV_TX_OK;
3987 switch (BOND_MODE(bond)) {
3988 case BOND_MODE_ROUNDROBIN:
3989 return bond_xmit_roundrobin(skb, dev);
3990 case BOND_MODE_ACTIVEBACKUP:
3991 return bond_xmit_activebackup(skb, dev);
3992 case BOND_MODE_8023AD:
3994 return bond_3ad_xor_xmit(skb, dev);
3995 case BOND_MODE_BROADCAST:
3996 return bond_xmit_broadcast(skb, dev);
3998 return bond_alb_xmit(skb, dev);
4000 return bond_tlb_xmit(skb, dev);
4002 /* Should never happen, mode already checked */
4003 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4005 bond_tx_drop(dev, skb);
4006 return NETDEV_TX_OK;
4010 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4012 struct bonding *bond = netdev_priv(dev);
4013 netdev_tx_t ret = NETDEV_TX_OK;
4015 /* If we risk deadlock from transmitting this in the
4016 * netpoll path, tell netpoll to queue the frame for later tx
4018 if (unlikely(is_netpoll_tx_blocked(dev)))
4019 return NETDEV_TX_BUSY;
4022 if (bond_has_slaves(bond))
4023 ret = __bond_start_xmit(skb, dev);
4025 bond_tx_drop(dev, skb);
4031 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4032 struct ethtool_cmd *ecmd)
4034 struct bonding *bond = netdev_priv(bond_dev);
4035 unsigned long speed = 0;
4036 struct list_head *iter;
4037 struct slave *slave;
4039 ecmd->duplex = DUPLEX_UNKNOWN;
4040 ecmd->port = PORT_OTHER;
4042 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4043 * do not need to check mode. Though link speed might not represent
4044 * the true receive or transmit bandwidth (not all modes are symmetric)
4045 * this is an accurate maximum.
4047 bond_for_each_slave(bond, slave, iter) {
4048 if (bond_slave_can_tx(slave)) {
4049 if (slave->speed != SPEED_UNKNOWN)
4050 speed += slave->speed;
4051 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4052 slave->duplex != DUPLEX_UNKNOWN)
4053 ecmd->duplex = slave->duplex;
4056 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4061 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4062 struct ethtool_drvinfo *drvinfo)
4064 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4065 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4066 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4070 static const struct ethtool_ops bond_ethtool_ops = {
4071 .get_drvinfo = bond_ethtool_get_drvinfo,
4072 .get_settings = bond_ethtool_get_settings,
4073 .get_link = ethtool_op_get_link,
4076 static const struct net_device_ops bond_netdev_ops = {
4077 .ndo_init = bond_init,
4078 .ndo_uninit = bond_uninit,
4079 .ndo_open = bond_open,
4080 .ndo_stop = bond_close,
4081 .ndo_start_xmit = bond_start_xmit,
4082 .ndo_select_queue = bond_select_queue,
4083 .ndo_get_stats64 = bond_get_stats,
4084 .ndo_do_ioctl = bond_do_ioctl,
4085 .ndo_change_rx_flags = bond_change_rx_flags,
4086 .ndo_set_rx_mode = bond_set_rx_mode,
4087 .ndo_change_mtu = bond_change_mtu,
4088 .ndo_set_mac_address = bond_set_mac_address,
4089 .ndo_neigh_setup = bond_neigh_setup,
4090 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4091 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4092 #ifdef CONFIG_NET_POLL_CONTROLLER
4093 .ndo_netpoll_setup = bond_netpoll_setup,
4094 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4095 .ndo_poll_controller = bond_poll_controller,
4097 .ndo_add_slave = bond_enslave,
4098 .ndo_del_slave = bond_release,
4099 .ndo_fix_features = bond_fix_features,
4100 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4101 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4102 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4103 .ndo_fdb_add = switchdev_port_fdb_add,
4104 .ndo_fdb_del = switchdev_port_fdb_del,
4105 .ndo_fdb_dump = switchdev_port_fdb_dump,
4106 .ndo_features_check = passthru_features_check,
4109 static const struct device_type bond_type = {
4113 static void bond_destructor(struct net_device *bond_dev)
4115 struct bonding *bond = netdev_priv(bond_dev);
4117 destroy_workqueue(bond->wq);
4118 free_netdev(bond_dev);
4121 void bond_setup(struct net_device *bond_dev)
4123 struct bonding *bond = netdev_priv(bond_dev);
4125 spin_lock_init(&bond->mode_lock);
4126 spin_lock_init(&bond->stats_lock);
4127 bond->params = bonding_defaults;
4129 /* Initialize pointers */
4130 bond->dev = bond_dev;
4132 /* Initialize the device entry points */
4133 ether_setup(bond_dev);
4134 bond_dev->netdev_ops = &bond_netdev_ops;
4135 bond_dev->ethtool_ops = &bond_ethtool_ops;
4137 bond_dev->destructor = bond_destructor;
4139 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4141 /* Initialize the device options */
4142 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4143 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4144 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4146 /* don't acquire bond device's netif_tx_lock when transmitting */
4147 bond_dev->features |= NETIF_F_LLTX;
4149 /* By default, we declare the bond to be fully
4150 * VLAN hardware accelerated capable. Special
4151 * care is taken in the various xmit functions
4152 * when there are slaves that are not hw accel
4156 /* Don't allow bond devices to change network namespaces. */
4157 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4159 bond_dev->hw_features = BOND_VLAN_FEATURES |
4160 NETIF_F_HW_VLAN_CTAG_TX |
4161 NETIF_F_HW_VLAN_CTAG_RX |
4162 NETIF_F_HW_VLAN_CTAG_FILTER;
4164 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4165 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4166 bond_dev->features |= bond_dev->hw_features;
4169 /* Destroy a bonding device.
4170 * Must be under rtnl_lock when this function is called.
4172 static void bond_uninit(struct net_device *bond_dev)
4174 struct bonding *bond = netdev_priv(bond_dev);
4175 struct list_head *iter;
4176 struct slave *slave;
4177 struct bond_up_slave *arr;
4179 bond_netpoll_cleanup(bond_dev);
4181 /* Release the bonded slaves */
4182 bond_for_each_slave(bond, slave, iter)
4183 __bond_release_one(bond_dev, slave->dev, true);
4184 netdev_info(bond_dev, "Released all slaves\n");
4186 arr = rtnl_dereference(bond->slave_arr);
4188 RCU_INIT_POINTER(bond->slave_arr, NULL);
4189 kfree_rcu(arr, rcu);
4192 list_del(&bond->bond_list);
4194 bond_debug_unregister(bond);
4197 /*------------------------- Module initialization ---------------------------*/
4199 static int bond_check_params(struct bond_params *params)
4201 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4202 struct bond_opt_value newval;
4203 const struct bond_opt_value *valptr;
4204 int arp_all_targets_value;
4205 u16 ad_actor_sys_prio = 0;
4206 u16 ad_user_port_key = 0;
4208 /* Convert string parameters. */
4210 bond_opt_initstr(&newval, mode);
4211 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4213 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4216 bond_mode = valptr->value;
4219 if (xmit_hash_policy) {
4220 if ((bond_mode != BOND_MODE_XOR) &&
4221 (bond_mode != BOND_MODE_8023AD) &&
4222 (bond_mode != BOND_MODE_TLB)) {
4223 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4224 bond_mode_name(bond_mode));
4226 bond_opt_initstr(&newval, xmit_hash_policy);
4227 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4230 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4234 xmit_hashtype = valptr->value;
4239 if (bond_mode != BOND_MODE_8023AD) {
4240 pr_info("lacp_rate param is irrelevant in mode %s\n",
4241 bond_mode_name(bond_mode));
4243 bond_opt_initstr(&newval, lacp_rate);
4244 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4247 pr_err("Error: Invalid lacp rate \"%s\"\n",
4251 lacp_fast = valptr->value;
4256 bond_opt_initstr(&newval, ad_select);
4257 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4260 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4263 params->ad_select = valptr->value;
4264 if (bond_mode != BOND_MODE_8023AD)
4265 pr_warn("ad_select param only affects 802.3ad mode\n");
4267 params->ad_select = BOND_AD_STABLE;
4270 if (max_bonds < 0) {
4271 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4272 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4273 max_bonds = BOND_DEFAULT_MAX_BONDS;
4277 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4283 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4288 if (downdelay < 0) {
4289 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4290 downdelay, INT_MAX);
4294 if ((use_carrier != 0) && (use_carrier != 1)) {
4295 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4300 if (num_peer_notif < 0 || num_peer_notif > 255) {
4301 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4306 /* reset values for 802.3ad/TLB/ALB */
4307 if (!bond_mode_uses_arp(bond_mode)) {
4309 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");
4310 pr_warn("Forcing miimon to 100msec\n");
4311 miimon = BOND_DEFAULT_MIIMON;
4315 if (tx_queues < 1 || tx_queues > 255) {
4316 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4317 tx_queues, BOND_DEFAULT_TX_QUEUES);
4318 tx_queues = BOND_DEFAULT_TX_QUEUES;
4321 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4322 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4324 all_slaves_active = 0;
4327 if (resend_igmp < 0 || resend_igmp > 255) {
4328 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4329 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4330 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4333 bond_opt_initval(&newval, packets_per_slave);
4334 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4335 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4336 packets_per_slave, USHRT_MAX);
4337 packets_per_slave = 1;
4340 if (bond_mode == BOND_MODE_ALB) {
4341 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",
4346 if (updelay || downdelay) {
4347 /* just warn the user the up/down delay will have
4348 * no effect since miimon is zero...
4350 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",
4351 updelay, downdelay);
4354 /* don't allow arp monitoring */
4356 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4357 miimon, arp_interval);
4361 if ((updelay % miimon) != 0) {
4362 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4363 updelay, miimon, (updelay / miimon) * miimon);
4368 if ((downdelay % miimon) != 0) {
4369 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4371 (downdelay / miimon) * miimon);
4374 downdelay /= miimon;
4377 if (arp_interval < 0) {
4378 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4379 arp_interval, INT_MAX);
4383 for (arp_ip_count = 0, i = 0;
4384 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4387 /* not a complete check, but good enough to catch mistakes */
4388 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4389 !bond_is_ip_target_ok(ip)) {
4390 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4394 if (bond_get_targets_ip(arp_target, ip) == -1)
4395 arp_target[arp_ip_count++] = ip;
4397 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4402 if (arp_interval && !arp_ip_count) {
4403 /* don't allow arping if no arp_ip_target given... */
4404 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4410 if (!arp_interval) {
4411 pr_err("arp_validate requires arp_interval\n");
4415 bond_opt_initstr(&newval, arp_validate);
4416 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4419 pr_err("Error: invalid arp_validate \"%s\"\n",
4423 arp_validate_value = valptr->value;
4425 arp_validate_value = 0;
4428 arp_all_targets_value = 0;
4429 if (arp_all_targets) {
4430 bond_opt_initstr(&newval, arp_all_targets);
4431 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4434 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4436 arp_all_targets_value = 0;
4438 arp_all_targets_value = valptr->value;
4443 pr_info("MII link monitoring set to %d ms\n", miimon);
4444 } else if (arp_interval) {
4445 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4446 arp_validate_value);
4447 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4448 arp_interval, valptr->string, arp_ip_count);
4450 for (i = 0; i < arp_ip_count; i++)
4451 pr_cont(" %s", arp_ip_target[i]);
4455 } else if (max_bonds) {
4456 /* miimon and arp_interval not set, we need one so things
4457 * work as expected, see bonding.txt for details
4459 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");
4462 if (primary && !bond_mode_uses_primary(bond_mode)) {
4463 /* currently, using a primary only makes sense
4464 * in active backup, TLB or ALB modes
4466 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4467 primary, bond_mode_name(bond_mode));
4471 if (primary && primary_reselect) {
4472 bond_opt_initstr(&newval, primary_reselect);
4473 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4476 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4480 primary_reselect_value = valptr->value;
4482 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4485 if (fail_over_mac) {
4486 bond_opt_initstr(&newval, fail_over_mac);
4487 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4490 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4494 fail_over_mac_value = valptr->value;
4495 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4496 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4498 fail_over_mac_value = BOND_FOM_NONE;
4501 bond_opt_initstr(&newval, "default");
4502 valptr = bond_opt_parse(
4503 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4506 pr_err("Error: No ad_actor_sys_prio default value");
4509 ad_actor_sys_prio = valptr->value;
4511 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4514 pr_err("Error: No ad_user_port_key default value");
4517 ad_user_port_key = valptr->value;
4519 if (lp_interval == 0) {
4520 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4521 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4522 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4525 /* fill params struct with the proper values */
4526 params->mode = bond_mode;
4527 params->xmit_policy = xmit_hashtype;
4528 params->miimon = miimon;
4529 params->num_peer_notif = num_peer_notif;
4530 params->arp_interval = arp_interval;
4531 params->arp_validate = arp_validate_value;
4532 params->arp_all_targets = arp_all_targets_value;
4533 params->updelay = updelay;
4534 params->downdelay = downdelay;
4535 params->use_carrier = use_carrier;
4536 params->lacp_fast = lacp_fast;
4537 params->primary[0] = 0;
4538 params->primary_reselect = primary_reselect_value;
4539 params->fail_over_mac = fail_over_mac_value;
4540 params->tx_queues = tx_queues;
4541 params->all_slaves_active = all_slaves_active;
4542 params->resend_igmp = resend_igmp;
4543 params->min_links = min_links;
4544 params->lp_interval = lp_interval;
4545 params->packets_per_slave = packets_per_slave;
4546 params->tlb_dynamic_lb = 1; /* Default value */
4547 params->ad_actor_sys_prio = ad_actor_sys_prio;
4548 eth_zero_addr(params->ad_actor_system);
4549 params->ad_user_port_key = ad_user_port_key;
4550 if (packets_per_slave > 0) {
4551 params->reciprocal_packets_per_slave =
4552 reciprocal_value(packets_per_slave);
4554 /* reciprocal_packets_per_slave is unused if
4555 * packets_per_slave is 0 or 1, just initialize it
4557 params->reciprocal_packets_per_slave =
4558 (struct reciprocal_value) { 0 };
4562 strncpy(params->primary, primary, IFNAMSIZ);
4563 params->primary[IFNAMSIZ - 1] = 0;
4566 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4571 static struct lock_class_key bonding_netdev_xmit_lock_key;
4572 static struct lock_class_key bonding_netdev_addr_lock_key;
4573 static struct lock_class_key bonding_tx_busylock_key;
4575 static void bond_set_lockdep_class_one(struct net_device *dev,
4576 struct netdev_queue *txq,
4579 lockdep_set_class(&txq->_xmit_lock,
4580 &bonding_netdev_xmit_lock_key);
4583 static void bond_set_lockdep_class(struct net_device *dev)
4585 lockdep_set_class(&dev->addr_list_lock,
4586 &bonding_netdev_addr_lock_key);
4587 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4588 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4591 /* Called from registration process */
4592 static int bond_init(struct net_device *bond_dev)
4594 struct bonding *bond = netdev_priv(bond_dev);
4595 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4597 netdev_dbg(bond_dev, "Begin bond_init\n");
4599 bond->wq = create_singlethread_workqueue(bond_dev->name);
4603 bond_set_lockdep_class(bond_dev);
4605 list_add_tail(&bond->bond_list, &bn->dev_list);
4607 bond_prepare_sysfs_group(bond);
4609 bond_debug_register(bond);
4611 /* Ensure valid dev_addr */
4612 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4613 bond_dev->addr_assign_type == NET_ADDR_PERM)
4614 eth_hw_addr_random(bond_dev);
4619 unsigned int bond_get_num_tx_queues(void)
4624 /* Create a new bond based on the specified name and bonding parameters.
4625 * If name is NULL, obtain a suitable "bond%d" name for us.
4626 * Caller must NOT hold rtnl_lock; we need to release it here before we
4627 * set up our sysfs entries.
4629 int bond_create(struct net *net, const char *name)
4631 struct net_device *bond_dev;
4632 struct bonding *bond;
4633 struct alb_bond_info *bond_info;
4638 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4639 name ? name : "bond%d", NET_NAME_UNKNOWN,
4640 bond_setup, tx_queues);
4642 pr_err("%s: eek! can't alloc netdev!\n", name);
4648 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4649 * It is set to 0 by default which is wrong.
4651 bond = netdev_priv(bond_dev);
4652 bond_info = &(BOND_ALB_INFO(bond));
4653 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4655 dev_net_set(bond_dev, net);
4656 bond_dev->rtnl_link_ops = &bond_link_ops;
4658 res = register_netdevice(bond_dev);
4660 netif_carrier_off(bond_dev);
4664 bond_destructor(bond_dev);
4668 static int __net_init bond_net_init(struct net *net)
4670 struct bond_net *bn = net_generic(net, bond_net_id);
4673 INIT_LIST_HEAD(&bn->dev_list);
4675 bond_create_proc_dir(bn);
4676 bond_create_sysfs(bn);
4681 static void __net_exit bond_net_exit(struct net *net)
4683 struct bond_net *bn = net_generic(net, bond_net_id);
4684 struct bonding *bond, *tmp_bond;
4687 bond_destroy_sysfs(bn);
4689 /* Kill off any bonds created after unregistering bond rtnl ops */
4691 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4692 unregister_netdevice_queue(bond->dev, &list);
4693 unregister_netdevice_many(&list);
4696 bond_destroy_proc_dir(bn);
4699 static struct pernet_operations bond_net_ops = {
4700 .init = bond_net_init,
4701 .exit = bond_net_exit,
4703 .size = sizeof(struct bond_net),
4706 static int __init bonding_init(void)
4711 pr_info("%s", bond_version);
4713 res = bond_check_params(&bonding_defaults);
4717 res = register_pernet_subsys(&bond_net_ops);
4721 res = bond_netlink_init();
4725 bond_create_debugfs();
4727 for (i = 0; i < max_bonds; i++) {
4728 res = bond_create(&init_net, NULL);
4733 register_netdevice_notifier(&bond_netdev_notifier);
4737 bond_destroy_debugfs();
4738 bond_netlink_fini();
4740 unregister_pernet_subsys(&bond_net_ops);
4745 static void __exit bonding_exit(void)
4747 unregister_netdevice_notifier(&bond_netdev_notifier);
4749 bond_destroy_debugfs();
4751 bond_netlink_fini();
4752 unregister_pernet_subsys(&bond_net_ops);
4754 #ifdef CONFIG_NET_POLL_CONTROLLER
4755 /* Make sure we don't have an imbalance on our netpoll blocking */
4756 WARN_ON(atomic_read(&netpoll_block_tx));
4760 module_init(bonding_init);
4761 module_exit(bonding_exit);
4762 MODULE_LICENSE("GPL");
4763 MODULE_VERSION(DRV_VERSION);
4764 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4765 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");