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
, "802.3ad 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 unsigned int bond_net_id __read_mostly
;
204 /*-------------------------- Forward declarations ---------------------------*/
206 static int bond_init(struct net_device
*bond_dev
);
207 static void bond_uninit(struct net_device
*bond_dev
);
208 static void bond_get_stats(struct net_device
*bond_dev
,
209 struct rtnl_link_stats64
*stats
);
210 static void bond_slave_arr_handler(struct work_struct
*work
);
211 static bool bond_time_in_interval(struct bonding
*bond
, unsigned long last_act
,
214 /*---------------------------- General routines -----------------------------*/
216 const char *bond_mode_name(int mode
)
218 static const char *names
[] = {
219 [BOND_MODE_ROUNDROBIN
] = "load balancing (round-robin)",
220 [BOND_MODE_ACTIVEBACKUP
] = "fault-tolerance (active-backup)",
221 [BOND_MODE_XOR
] = "load balancing (xor)",
222 [BOND_MODE_BROADCAST
] = "fault-tolerance (broadcast)",
223 [BOND_MODE_8023AD
] = "IEEE 802.3ad Dynamic link aggregation",
224 [BOND_MODE_TLB
] = "transmit load balancing",
225 [BOND_MODE_ALB
] = "adaptive load balancing",
228 if (mode
< BOND_MODE_ROUNDROBIN
|| mode
> BOND_MODE_ALB
)
234 /*---------------------------------- VLAN -----------------------------------*/
237 * bond_dev_queue_xmit - Prepare skb for xmit.
239 * @bond: bond device that got this skb for tx.
240 * @skb: hw accel VLAN tagged skb to transmit
241 * @slave_dev: slave that is supposed to xmit this skbuff
243 void bond_dev_queue_xmit(struct bonding
*bond
, struct sk_buff
*skb
,
244 struct net_device
*slave_dev
)
246 skb
->dev
= slave_dev
;
248 BUILD_BUG_ON(sizeof(skb
->queue_mapping
) !=
249 sizeof(qdisc_skb_cb(skb
)->slave_dev_queue_mapping
));
250 skb
->queue_mapping
= qdisc_skb_cb(skb
)->slave_dev_queue_mapping
;
252 if (unlikely(netpoll_tx_running(bond
->dev
)))
253 bond_netpoll_send_skb(bond_get_slave_by_dev(bond
, slave_dev
), skb
);
258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
259 * We don't protect the slave list iteration with a lock because:
260 * a. This operation is performed in IOCTL context,
261 * b. The operation is protected by the RTNL semaphore in the 8021q code,
262 * c. Holding a lock with BH disabled while directly calling a base driver
263 * entry point is generally a BAD idea.
265 * The design of synchronization/protection for this operation in the 8021q
266 * module is good for one or more VLAN devices over a single physical device
267 * and cannot be extended for a teaming solution like bonding, so there is a
268 * potential race condition here where a net device from the vlan group might
269 * be referenced (either by a base driver or the 8021q code) while it is being
270 * removed from the system. However, it turns out we're not making matters
271 * worse, and if it works for regular VLAN usage it will work here too.
275 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
276 * @bond_dev: bonding net device that got called
277 * @vid: vlan id being added
279 static int bond_vlan_rx_add_vid(struct net_device
*bond_dev
,
280 __be16 proto
, u16 vid
)
282 struct bonding
*bond
= netdev_priv(bond_dev
);
283 struct slave
*slave
, *rollback_slave
;
284 struct list_head
*iter
;
287 bond_for_each_slave(bond
, slave
, iter
) {
288 res
= vlan_vid_add(slave
->dev
, proto
, vid
);
296 /* unwind to the slave that failed */
297 bond_for_each_slave(bond
, rollback_slave
, iter
) {
298 if (rollback_slave
== slave
)
301 vlan_vid_del(rollback_slave
->dev
, proto
, vid
);
308 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
309 * @bond_dev: bonding net device that got called
310 * @vid: vlan id being removed
312 static int bond_vlan_rx_kill_vid(struct net_device
*bond_dev
,
313 __be16 proto
, u16 vid
)
315 struct bonding
*bond
= netdev_priv(bond_dev
);
316 struct list_head
*iter
;
319 bond_for_each_slave(bond
, slave
, iter
)
320 vlan_vid_del(slave
->dev
, proto
, vid
);
322 if (bond_is_lb(bond
))
323 bond_alb_clear_vlan(bond
, vid
);
328 /*------------------------------- Link status -------------------------------*/
330 /* Set the carrier state for the master according to the state of its
331 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
332 * do special 802.3ad magic.
334 * Returns zero if carrier state does not change, nonzero if it does.
336 int bond_set_carrier(struct bonding
*bond
)
338 struct list_head
*iter
;
341 if (!bond_has_slaves(bond
))
344 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
345 return bond_3ad_set_carrier(bond
);
347 bond_for_each_slave(bond
, slave
, iter
) {
348 if (slave
->link
== BOND_LINK_UP
) {
349 if (!netif_carrier_ok(bond
->dev
)) {
350 netif_carrier_on(bond
->dev
);
358 if (netif_carrier_ok(bond
->dev
)) {
359 netif_carrier_off(bond
->dev
);
365 /* Get link speed and duplex from the slave's base driver
366 * using ethtool. If for some reason the call fails or the
367 * values are invalid, set speed and duplex to -1,
368 * and return. Return 1 if speed or duplex settings are
369 * UNKNOWN; 0 otherwise.
371 static int bond_update_speed_duplex(struct slave
*slave
)
373 struct net_device
*slave_dev
= slave
->dev
;
374 struct ethtool_link_ksettings ecmd
;
377 slave
->speed
= SPEED_UNKNOWN
;
378 slave
->duplex
= DUPLEX_UNKNOWN
;
380 res
= __ethtool_get_link_ksettings(slave_dev
, &ecmd
);
383 if (ecmd
.base
.speed
== 0 || ecmd
.base
.speed
== ((__u32
)-1))
385 switch (ecmd
.base
.duplex
) {
393 slave
->speed
= ecmd
.base
.speed
;
394 slave
->duplex
= ecmd
.base
.duplex
;
399 const char *bond_slave_link_status(s8 link
)
415 /* if <dev> supports MII link status reporting, check its link status.
417 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
418 * depending upon the setting of the use_carrier parameter.
420 * Return either BMSR_LSTATUS, meaning that the link is up (or we
421 * can't tell and just pretend it is), or 0, meaning that the link is
424 * If reporting is non-zero, instead of faking link up, return -1 if
425 * both ETHTOOL and MII ioctls fail (meaning the device does not
426 * support them). If use_carrier is set, return whatever it says.
427 * It'd be nice if there was a good way to tell if a driver supports
428 * netif_carrier, but there really isn't.
430 static int bond_check_dev_link(struct bonding
*bond
,
431 struct net_device
*slave_dev
, int reporting
)
433 const struct net_device_ops
*slave_ops
= slave_dev
->netdev_ops
;
434 int (*ioctl
)(struct net_device
*, struct ifreq
*, int);
436 struct mii_ioctl_data
*mii
;
438 if (!reporting
&& !netif_running(slave_dev
))
441 if (bond
->params
.use_carrier
)
442 return netif_carrier_ok(slave_dev
) ? BMSR_LSTATUS
: 0;
444 /* Try to get link status using Ethtool first. */
445 if (slave_dev
->ethtool_ops
->get_link
)
446 return slave_dev
->ethtool_ops
->get_link(slave_dev
) ?
449 /* Ethtool can't be used, fallback to MII ioctls. */
450 ioctl
= slave_ops
->ndo_do_ioctl
;
452 /* TODO: set pointer to correct ioctl on a per team member
453 * bases to make this more efficient. that is, once
454 * we determine the correct ioctl, we will always
455 * call it and not the others for that team
459 /* We cannot assume that SIOCGMIIPHY will also read a
460 * register; not all network drivers (e.g., e100)
464 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
465 strncpy(ifr
.ifr_name
, slave_dev
->name
, IFNAMSIZ
);
467 if (ioctl(slave_dev
, &ifr
, SIOCGMIIPHY
) == 0) {
468 mii
->reg_num
= MII_BMSR
;
469 if (ioctl(slave_dev
, &ifr
, SIOCGMIIREG
) == 0)
470 return mii
->val_out
& BMSR_LSTATUS
;
474 /* If reporting, report that either there's no dev->do_ioctl,
475 * or both SIOCGMIIREG and get_link failed (meaning that we
476 * cannot report link status). If not reporting, pretend
479 return reporting
? -1 : BMSR_LSTATUS
;
482 /*----------------------------- Multicast list ------------------------------*/
484 /* Push the promiscuity flag down to appropriate slaves */
485 static int bond_set_promiscuity(struct bonding
*bond
, int inc
)
487 struct list_head
*iter
;
490 if (bond_uses_primary(bond
)) {
491 struct slave
*curr_active
= rtnl_dereference(bond
->curr_active_slave
);
494 err
= dev_set_promiscuity(curr_active
->dev
, inc
);
498 bond_for_each_slave(bond
, slave
, iter
) {
499 err
= dev_set_promiscuity(slave
->dev
, inc
);
507 /* Push the allmulti flag down to all slaves */
508 static int bond_set_allmulti(struct bonding
*bond
, int inc
)
510 struct list_head
*iter
;
513 if (bond_uses_primary(bond
)) {
514 struct slave
*curr_active
= rtnl_dereference(bond
->curr_active_slave
);
517 err
= dev_set_allmulti(curr_active
->dev
, inc
);
521 bond_for_each_slave(bond
, slave
, iter
) {
522 err
= dev_set_allmulti(slave
->dev
, inc
);
530 /* Retrieve the list of registered multicast addresses for the bonding
531 * device and retransmit an IGMP JOIN request to the current active
534 static void bond_resend_igmp_join_requests_delayed(struct work_struct
*work
)
536 struct bonding
*bond
= container_of(work
, struct bonding
,
539 if (!rtnl_trylock()) {
540 queue_delayed_work(bond
->wq
, &bond
->mcast_work
, 1);
543 call_netdevice_notifiers(NETDEV_RESEND_IGMP
, bond
->dev
);
545 if (bond
->igmp_retrans
> 1) {
546 bond
->igmp_retrans
--;
547 queue_delayed_work(bond
->wq
, &bond
->mcast_work
, HZ
/5);
552 /* Flush bond's hardware addresses from slave */
553 static void bond_hw_addr_flush(struct net_device
*bond_dev
,
554 struct net_device
*slave_dev
)
556 struct bonding
*bond
= netdev_priv(bond_dev
);
558 dev_uc_unsync(slave_dev
, bond_dev
);
559 dev_mc_unsync(slave_dev
, bond_dev
);
561 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
562 /* del lacpdu mc addr from mc list */
563 u8 lacpdu_multicast
[ETH_ALEN
] = MULTICAST_LACPDU_ADDR
;
565 dev_mc_del(slave_dev
, lacpdu_multicast
);
569 /*--------------------------- Active slave change ---------------------------*/
571 /* Update the hardware address list and promisc/allmulti for the new and
572 * old active slaves (if any). Modes that are not using primary keep all
573 * slaves up date at all times; only the modes that use primary need to call
574 * this function to swap these settings during a failover.
576 static void bond_hw_addr_swap(struct bonding
*bond
, struct slave
*new_active
,
577 struct slave
*old_active
)
580 if (bond
->dev
->flags
& IFF_PROMISC
)
581 dev_set_promiscuity(old_active
->dev
, -1);
583 if (bond
->dev
->flags
& IFF_ALLMULTI
)
584 dev_set_allmulti(old_active
->dev
, -1);
586 bond_hw_addr_flush(bond
->dev
, old_active
->dev
);
590 /* FIXME: Signal errors upstream. */
591 if (bond
->dev
->flags
& IFF_PROMISC
)
592 dev_set_promiscuity(new_active
->dev
, 1);
594 if (bond
->dev
->flags
& IFF_ALLMULTI
)
595 dev_set_allmulti(new_active
->dev
, 1);
597 netif_addr_lock_bh(bond
->dev
);
598 dev_uc_sync(new_active
->dev
, bond
->dev
);
599 dev_mc_sync(new_active
->dev
, bond
->dev
);
600 netif_addr_unlock_bh(bond
->dev
);
605 * bond_set_dev_addr - clone slave's address to bond
606 * @bond_dev: bond net device
607 * @slave_dev: slave net device
609 * Should be called with RTNL held.
611 static void bond_set_dev_addr(struct net_device
*bond_dev
,
612 struct net_device
*slave_dev
)
614 netdev_dbg(bond_dev
, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
615 bond_dev
, slave_dev
, slave_dev
->name
, slave_dev
->addr_len
);
616 memcpy(bond_dev
->dev_addr
, slave_dev
->dev_addr
, slave_dev
->addr_len
);
617 bond_dev
->addr_assign_type
= NET_ADDR_STOLEN
;
618 call_netdevice_notifiers(NETDEV_CHANGEADDR
, bond_dev
);
621 static struct slave
*bond_get_old_active(struct bonding
*bond
,
622 struct slave
*new_active
)
625 struct list_head
*iter
;
627 bond_for_each_slave(bond
, slave
, iter
) {
628 if (slave
== new_active
)
631 if (ether_addr_equal(bond
->dev
->dev_addr
, slave
->dev
->dev_addr
))
638 /* bond_do_fail_over_mac
640 * Perform special MAC address swapping for fail_over_mac settings
644 static void bond_do_fail_over_mac(struct bonding
*bond
,
645 struct slave
*new_active
,
646 struct slave
*old_active
)
648 u8 tmp_mac
[MAX_ADDR_LEN
];
649 struct sockaddr_storage ss
;
652 switch (bond
->params
.fail_over_mac
) {
653 case BOND_FOM_ACTIVE
:
655 bond_set_dev_addr(bond
->dev
, new_active
->dev
);
657 case BOND_FOM_FOLLOW
:
658 /* if new_active && old_active, swap them
659 * if just old_active, do nothing (going to no active slave)
660 * if just new_active, set new_active to bond's MAC
666 old_active
= bond_get_old_active(bond
, new_active
);
669 bond_hw_addr_copy(tmp_mac
, new_active
->dev
->dev_addr
,
670 new_active
->dev
->addr_len
);
671 bond_hw_addr_copy(ss
.__data
,
672 old_active
->dev
->dev_addr
,
673 old_active
->dev
->addr_len
);
674 ss
.ss_family
= new_active
->dev
->type
;
676 bond_hw_addr_copy(ss
.__data
, bond
->dev
->dev_addr
,
677 bond
->dev
->addr_len
);
678 ss
.ss_family
= bond
->dev
->type
;
681 rv
= dev_set_mac_address(new_active
->dev
,
682 (struct sockaddr
*)&ss
);
684 netdev_err(bond
->dev
, "Error %d setting MAC of slave %s\n",
685 -rv
, new_active
->dev
->name
);
692 bond_hw_addr_copy(ss
.__data
, tmp_mac
,
693 new_active
->dev
->addr_len
);
694 ss
.ss_family
= old_active
->dev
->type
;
696 rv
= dev_set_mac_address(old_active
->dev
,
697 (struct sockaddr
*)&ss
);
699 netdev_err(bond
->dev
, "Error %d setting MAC of slave %s\n",
700 -rv
, new_active
->dev
->name
);
704 netdev_err(bond
->dev
, "bond_do_fail_over_mac impossible: bad policy %d\n",
705 bond
->params
.fail_over_mac
);
711 static struct slave
*bond_choose_primary_or_current(struct bonding
*bond
)
713 struct slave
*prim
= rtnl_dereference(bond
->primary_slave
);
714 struct slave
*curr
= rtnl_dereference(bond
->curr_active_slave
);
716 if (!prim
|| prim
->link
!= BOND_LINK_UP
) {
717 if (!curr
|| curr
->link
!= BOND_LINK_UP
)
722 if (bond
->force_primary
) {
723 bond
->force_primary
= false;
727 if (!curr
|| curr
->link
!= BOND_LINK_UP
)
730 /* At this point, prim and curr are both up */
731 switch (bond
->params
.primary_reselect
) {
732 case BOND_PRI_RESELECT_ALWAYS
:
734 case BOND_PRI_RESELECT_BETTER
:
735 if (prim
->speed
< curr
->speed
)
737 if (prim
->speed
== curr
->speed
&& prim
->duplex
<= curr
->duplex
)
740 case BOND_PRI_RESELECT_FAILURE
:
743 netdev_err(bond
->dev
, "impossible primary_reselect %d\n",
744 bond
->params
.primary_reselect
);
750 * bond_find_best_slave - select the best available slave to be the active one
751 * @bond: our bonding struct
753 static struct slave
*bond_find_best_slave(struct bonding
*bond
)
755 struct slave
*slave
, *bestslave
= NULL
;
756 struct list_head
*iter
;
757 int mintime
= bond
->params
.updelay
;
759 slave
= bond_choose_primary_or_current(bond
);
763 bond_for_each_slave(bond
, slave
, iter
) {
764 if (slave
->link
== BOND_LINK_UP
)
766 if (slave
->link
== BOND_LINK_BACK
&& bond_slave_is_up(slave
) &&
767 slave
->delay
< mintime
) {
768 mintime
= slave
->delay
;
776 static bool bond_should_notify_peers(struct bonding
*bond
)
781 slave
= rcu_dereference(bond
->curr_active_slave
);
784 netdev_dbg(bond
->dev
, "bond_should_notify_peers: slave %s\n",
785 slave
? slave
->dev
->name
: "NULL");
787 if (!slave
|| !bond
->send_peer_notif
||
788 !netif_carrier_ok(bond
->dev
) ||
789 test_bit(__LINK_STATE_LINKWATCH_PENDING
, &slave
->dev
->state
))
796 * change_active_interface - change the active slave into the specified one
797 * @bond: our bonding struct
798 * @new: the new slave to make the active one
800 * Set the new slave to the bond's settings and unset them on the old
802 * Setting include flags, mc-list, promiscuity, allmulti, etc.
804 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
805 * because it is apparently the best available slave we have, even though its
806 * updelay hasn't timed out yet.
808 * Caller must hold RTNL.
810 void bond_change_active_slave(struct bonding
*bond
, struct slave
*new_active
)
812 struct slave
*old_active
;
816 old_active
= rtnl_dereference(bond
->curr_active_slave
);
818 if (old_active
== new_active
)
822 new_active
->last_link_up
= jiffies
;
824 if (new_active
->link
== BOND_LINK_BACK
) {
825 if (bond_uses_primary(bond
)) {
826 netdev_info(bond
->dev
, "making interface %s the new active one %d ms earlier\n",
827 new_active
->dev
->name
,
828 (bond
->params
.updelay
- new_active
->delay
) * bond
->params
.miimon
);
831 new_active
->delay
= 0;
832 bond_set_slave_link_state(new_active
, BOND_LINK_UP
,
833 BOND_SLAVE_NOTIFY_NOW
);
835 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
836 bond_3ad_handle_link_change(new_active
, BOND_LINK_UP
);
838 if (bond_is_lb(bond
))
839 bond_alb_handle_link_change(bond
, new_active
, BOND_LINK_UP
);
841 if (bond_uses_primary(bond
)) {
842 netdev_info(bond
->dev
, "making interface %s the new active one\n",
843 new_active
->dev
->name
);
848 if (bond_uses_primary(bond
))
849 bond_hw_addr_swap(bond
, new_active
, old_active
);
851 if (bond_is_lb(bond
)) {
852 bond_alb_handle_active_change(bond
, new_active
);
854 bond_set_slave_inactive_flags(old_active
,
855 BOND_SLAVE_NOTIFY_NOW
);
857 bond_set_slave_active_flags(new_active
,
858 BOND_SLAVE_NOTIFY_NOW
);
860 rcu_assign_pointer(bond
->curr_active_slave
, new_active
);
863 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
) {
865 bond_set_slave_inactive_flags(old_active
,
866 BOND_SLAVE_NOTIFY_NOW
);
869 bool should_notify_peers
= false;
871 bond_set_slave_active_flags(new_active
,
872 BOND_SLAVE_NOTIFY_NOW
);
874 if (bond
->params
.fail_over_mac
)
875 bond_do_fail_over_mac(bond
, new_active
,
878 if (netif_running(bond
->dev
)) {
879 bond
->send_peer_notif
=
880 bond
->params
.num_peer_notif
;
881 should_notify_peers
=
882 bond_should_notify_peers(bond
);
885 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER
, bond
->dev
);
886 if (should_notify_peers
)
887 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
,
892 /* resend IGMP joins since active slave has changed or
893 * all were sent on curr_active_slave.
894 * resend only if bond is brought up with the affected
895 * bonding modes and the retransmission is enabled
897 if (netif_running(bond
->dev
) && (bond
->params
.resend_igmp
> 0) &&
898 ((bond_uses_primary(bond
) && new_active
) ||
899 BOND_MODE(bond
) == BOND_MODE_ROUNDROBIN
)) {
900 bond
->igmp_retrans
= bond
->params
.resend_igmp
;
901 queue_delayed_work(bond
->wq
, &bond
->mcast_work
, 1);
906 * bond_select_active_slave - select a new active slave, if needed
907 * @bond: our bonding struct
909 * This functions should be called when one of the following occurs:
910 * - The old curr_active_slave has been released or lost its link.
911 * - The primary_slave has got its link back.
912 * - A slave has got its link back and there's no old curr_active_slave.
914 * Caller must hold RTNL.
916 void bond_select_active_slave(struct bonding
*bond
)
918 struct slave
*best_slave
;
923 best_slave
= bond_find_best_slave(bond
);
924 if (best_slave
!= rtnl_dereference(bond
->curr_active_slave
)) {
925 bond_change_active_slave(bond
, best_slave
);
926 rv
= bond_set_carrier(bond
);
930 if (netif_carrier_ok(bond
->dev
))
931 netdev_info(bond
->dev
, "first active interface up!\n");
933 netdev_info(bond
->dev
, "now running without any active interface!\n");
937 #ifdef CONFIG_NET_POLL_CONTROLLER
938 static inline int slave_enable_netpoll(struct slave
*slave
)
943 np
= kzalloc(sizeof(*np
), GFP_KERNEL
);
948 err
= __netpoll_setup(np
, slave
->dev
);
957 static inline void slave_disable_netpoll(struct slave
*slave
)
959 struct netpoll
*np
= slave
->np
;
965 __netpoll_free_async(np
);
968 static void bond_poll_controller(struct net_device
*bond_dev
)
970 struct bonding
*bond
= netdev_priv(bond_dev
);
971 struct slave
*slave
= NULL
;
972 struct list_head
*iter
;
973 struct ad_info ad_info
;
974 struct netpoll_info
*ni
;
975 const struct net_device_ops
*ops
;
977 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
978 if (bond_3ad_get_active_agg_info(bond
, &ad_info
))
981 bond_for_each_slave_rcu(bond
, slave
, iter
) {
982 ops
= slave
->dev
->netdev_ops
;
983 if (!bond_slave_is_up(slave
) || !ops
->ndo_poll_controller
)
986 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
987 struct aggregator
*agg
=
988 SLAVE_AD_INFO(slave
)->port
.aggregator
;
991 agg
->aggregator_identifier
!= ad_info
.aggregator_id
)
995 ni
= rcu_dereference_bh(slave
->dev
->npinfo
);
996 if (down_trylock(&ni
->dev_lock
))
998 ops
->ndo_poll_controller(slave
->dev
);
1003 static void bond_netpoll_cleanup(struct net_device
*bond_dev
)
1005 struct bonding
*bond
= netdev_priv(bond_dev
);
1006 struct list_head
*iter
;
1007 struct slave
*slave
;
1009 bond_for_each_slave(bond
, slave
, iter
)
1010 if (bond_slave_is_up(slave
))
1011 slave_disable_netpoll(slave
);
1014 static int bond_netpoll_setup(struct net_device
*dev
, struct netpoll_info
*ni
)
1016 struct bonding
*bond
= netdev_priv(dev
);
1017 struct list_head
*iter
;
1018 struct slave
*slave
;
1021 bond_for_each_slave(bond
, slave
, iter
) {
1022 err
= slave_enable_netpoll(slave
);
1024 bond_netpoll_cleanup(dev
);
1031 static inline int slave_enable_netpoll(struct slave
*slave
)
1035 static inline void slave_disable_netpoll(struct slave
*slave
)
1038 static void bond_netpoll_cleanup(struct net_device
*bond_dev
)
1043 /*---------------------------------- IOCTL ----------------------------------*/
1045 static netdev_features_t
bond_fix_features(struct net_device
*dev
,
1046 netdev_features_t features
)
1048 struct bonding
*bond
= netdev_priv(dev
);
1049 struct list_head
*iter
;
1050 netdev_features_t mask
;
1051 struct slave
*slave
;
1055 features
&= ~NETIF_F_ONE_FOR_ALL
;
1056 features
|= NETIF_F_ALL_FOR_ALL
;
1058 bond_for_each_slave(bond
, slave
, iter
) {
1059 features
= netdev_increment_features(features
,
1060 slave
->dev
->features
,
1063 features
= netdev_add_tso_features(features
, mask
);
1068 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1069 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1070 NETIF_F_HIGHDMA | NETIF_F_LRO)
1072 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1073 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1075 static void bond_compute_features(struct bonding
*bond
)
1077 unsigned int dst_release_flag
= IFF_XMIT_DST_RELEASE
|
1078 IFF_XMIT_DST_RELEASE_PERM
;
1079 netdev_features_t vlan_features
= BOND_VLAN_FEATURES
;
1080 netdev_features_t enc_features
= BOND_ENC_FEATURES
;
1081 struct net_device
*bond_dev
= bond
->dev
;
1082 struct list_head
*iter
;
1083 struct slave
*slave
;
1084 unsigned short max_hard_header_len
= ETH_HLEN
;
1085 unsigned int gso_max_size
= GSO_MAX_SIZE
;
1086 u16 gso_max_segs
= GSO_MAX_SEGS
;
1088 if (!bond_has_slaves(bond
))
1090 vlan_features
&= NETIF_F_ALL_FOR_ALL
;
1092 bond_for_each_slave(bond
, slave
, iter
) {
1093 vlan_features
= netdev_increment_features(vlan_features
,
1094 slave
->dev
->vlan_features
, BOND_VLAN_FEATURES
);
1096 enc_features
= netdev_increment_features(enc_features
,
1097 slave
->dev
->hw_enc_features
,
1099 dst_release_flag
&= slave
->dev
->priv_flags
;
1100 if (slave
->dev
->hard_header_len
> max_hard_header_len
)
1101 max_hard_header_len
= slave
->dev
->hard_header_len
;
1103 gso_max_size
= min(gso_max_size
, slave
->dev
->gso_max_size
);
1104 gso_max_segs
= min(gso_max_segs
, slave
->dev
->gso_max_segs
);
1106 bond_dev
->hard_header_len
= max_hard_header_len
;
1109 bond_dev
->vlan_features
= vlan_features
;
1110 bond_dev
->hw_enc_features
= enc_features
| NETIF_F_GSO_ENCAP_ALL
;
1111 bond_dev
->gso_max_segs
= gso_max_segs
;
1112 netif_set_gso_max_size(bond_dev
, gso_max_size
);
1114 bond_dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1115 if ((bond_dev
->priv_flags
& IFF_XMIT_DST_RELEASE_PERM
) &&
1116 dst_release_flag
== (IFF_XMIT_DST_RELEASE
| IFF_XMIT_DST_RELEASE_PERM
))
1117 bond_dev
->priv_flags
|= IFF_XMIT_DST_RELEASE
;
1119 netdev_change_features(bond_dev
);
1122 static void bond_setup_by_slave(struct net_device
*bond_dev
,
1123 struct net_device
*slave_dev
)
1125 bond_dev
->header_ops
= slave_dev
->header_ops
;
1127 bond_dev
->type
= slave_dev
->type
;
1128 bond_dev
->hard_header_len
= slave_dev
->hard_header_len
;
1129 bond_dev
->addr_len
= slave_dev
->addr_len
;
1131 memcpy(bond_dev
->broadcast
, slave_dev
->broadcast
,
1132 slave_dev
->addr_len
);
1135 /* On bonding slaves other than the currently active slave, suppress
1136 * duplicates except for alb non-mcast/bcast.
1138 static bool bond_should_deliver_exact_match(struct sk_buff
*skb
,
1139 struct slave
*slave
,
1140 struct bonding
*bond
)
1142 if (bond_is_slave_inactive(slave
)) {
1143 if (BOND_MODE(bond
) == BOND_MODE_ALB
&&
1144 skb
->pkt_type
!= PACKET_BROADCAST
&&
1145 skb
->pkt_type
!= PACKET_MULTICAST
)
1152 static rx_handler_result_t
bond_handle_frame(struct sk_buff
**pskb
)
1154 struct sk_buff
*skb
= *pskb
;
1155 struct slave
*slave
;
1156 struct bonding
*bond
;
1157 int (*recv_probe
)(const struct sk_buff
*, struct bonding
*,
1159 int ret
= RX_HANDLER_ANOTHER
;
1161 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1163 return RX_HANDLER_CONSUMED
;
1167 slave
= bond_slave_get_rcu(skb
->dev
);
1170 recv_probe
= ACCESS_ONCE(bond
->recv_probe
);
1172 ret
= recv_probe(skb
, bond
, slave
);
1173 if (ret
== RX_HANDLER_CONSUMED
) {
1179 /* don't change skb->dev for link-local packets */
1180 if (is_link_local_ether_addr(eth_hdr(skb
)->h_dest
))
1181 return RX_HANDLER_PASS
;
1182 if (bond_should_deliver_exact_match(skb
, slave
, bond
))
1183 return RX_HANDLER_EXACT
;
1185 skb
->dev
= bond
->dev
;
1187 if (BOND_MODE(bond
) == BOND_MODE_ALB
&&
1188 bond
->dev
->priv_flags
& IFF_BRIDGE_PORT
&&
1189 skb
->pkt_type
== PACKET_HOST
) {
1191 if (unlikely(skb_cow_head(skb
,
1192 skb
->data
- skb_mac_header(skb
)))) {
1194 return RX_HANDLER_CONSUMED
;
1196 bond_hw_addr_copy(eth_hdr(skb
)->h_dest
, bond
->dev
->dev_addr
,
1197 bond
->dev
->addr_len
);
1203 static enum netdev_lag_tx_type
bond_lag_tx_type(struct bonding
*bond
)
1205 switch (BOND_MODE(bond
)) {
1206 case BOND_MODE_ROUNDROBIN
:
1207 return NETDEV_LAG_TX_TYPE_ROUNDROBIN
;
1208 case BOND_MODE_ACTIVEBACKUP
:
1209 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP
;
1210 case BOND_MODE_BROADCAST
:
1211 return NETDEV_LAG_TX_TYPE_BROADCAST
;
1213 case BOND_MODE_8023AD
:
1214 return NETDEV_LAG_TX_TYPE_HASH
;
1216 return NETDEV_LAG_TX_TYPE_UNKNOWN
;
1220 static int bond_master_upper_dev_link(struct bonding
*bond
, struct slave
*slave
)
1222 struct netdev_lag_upper_info lag_upper_info
;
1225 lag_upper_info
.tx_type
= bond_lag_tx_type(bond
);
1226 err
= netdev_master_upper_dev_link(slave
->dev
, bond
->dev
, slave
,
1230 rtmsg_ifinfo(RTM_NEWLINK
, slave
->dev
, IFF_SLAVE
, GFP_KERNEL
);
1234 static void bond_upper_dev_unlink(struct bonding
*bond
, struct slave
*slave
)
1236 netdev_upper_dev_unlink(slave
->dev
, bond
->dev
);
1237 slave
->dev
->flags
&= ~IFF_SLAVE
;
1238 rtmsg_ifinfo(RTM_NEWLINK
, slave
->dev
, IFF_SLAVE
, GFP_KERNEL
);
1241 static struct slave
*bond_alloc_slave(struct bonding
*bond
)
1243 struct slave
*slave
= NULL
;
1245 slave
= kzalloc(sizeof(*slave
), GFP_KERNEL
);
1249 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
1250 SLAVE_AD_INFO(slave
) = kzalloc(sizeof(struct ad_slave_info
),
1252 if (!SLAVE_AD_INFO(slave
)) {
1260 static void bond_free_slave(struct slave
*slave
)
1262 struct bonding
*bond
= bond_get_bond_by_slave(slave
);
1264 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
1265 kfree(SLAVE_AD_INFO(slave
));
1270 static void bond_fill_ifbond(struct bonding
*bond
, struct ifbond
*info
)
1272 info
->bond_mode
= BOND_MODE(bond
);
1273 info
->miimon
= bond
->params
.miimon
;
1274 info
->num_slaves
= bond
->slave_cnt
;
1277 static void bond_fill_ifslave(struct slave
*slave
, struct ifslave
*info
)
1279 strcpy(info
->slave_name
, slave
->dev
->name
);
1280 info
->link
= slave
->link
;
1281 info
->state
= bond_slave_state(slave
);
1282 info
->link_failure_count
= slave
->link_failure_count
;
1285 static void bond_netdev_notify(struct net_device
*dev
,
1286 struct netdev_bonding_info
*info
)
1289 netdev_bonding_info_change(dev
, info
);
1293 static void bond_netdev_notify_work(struct work_struct
*_work
)
1295 struct netdev_notify_work
*w
=
1296 container_of(_work
, struct netdev_notify_work
, work
.work
);
1298 bond_netdev_notify(w
->dev
, &w
->bonding_info
);
1303 void bond_queue_slave_event(struct slave
*slave
)
1305 struct bonding
*bond
= slave
->bond
;
1306 struct netdev_notify_work
*nnw
= kzalloc(sizeof(*nnw
), GFP_ATOMIC
);
1311 dev_hold(slave
->dev
);
1312 nnw
->dev
= slave
->dev
;
1313 bond_fill_ifslave(slave
, &nnw
->bonding_info
.slave
);
1314 bond_fill_ifbond(bond
, &nnw
->bonding_info
.master
);
1315 INIT_DELAYED_WORK(&nnw
->work
, bond_netdev_notify_work
);
1317 queue_delayed_work(slave
->bond
->wq
, &nnw
->work
, 0);
1320 void bond_lower_state_changed(struct slave
*slave
)
1322 struct netdev_lag_lower_state_info info
;
1324 info
.link_up
= slave
->link
== BOND_LINK_UP
||
1325 slave
->link
== BOND_LINK_FAIL
;
1326 info
.tx_enabled
= bond_is_active_slave(slave
);
1327 netdev_lower_state_changed(slave
->dev
, &info
);
1330 /* enslave device <slave> to bond device <master> */
1331 int bond_enslave(struct net_device
*bond_dev
, struct net_device
*slave_dev
)
1333 struct bonding
*bond
= netdev_priv(bond_dev
);
1334 const struct net_device_ops
*slave_ops
= slave_dev
->netdev_ops
;
1335 struct slave
*new_slave
= NULL
, *prev_slave
;
1336 struct sockaddr_storage ss
;
1340 if (!bond
->params
.use_carrier
&&
1341 slave_dev
->ethtool_ops
->get_link
== NULL
&&
1342 slave_ops
->ndo_do_ioctl
== NULL
) {
1343 netdev_warn(bond_dev
, "no link monitoring support for %s\n",
1347 /* already in-use? */
1348 if (netdev_is_rx_handler_busy(slave_dev
)) {
1349 netdev_err(bond_dev
,
1350 "Error: Device is in use and cannot be enslaved\n");
1354 if (bond_dev
== slave_dev
) {
1355 netdev_err(bond_dev
, "cannot enslave bond to itself.\n");
1359 /* vlan challenged mutual exclusion */
1360 /* no need to lock since we're protected by rtnl_lock */
1361 if (slave_dev
->features
& NETIF_F_VLAN_CHALLENGED
) {
1362 netdev_dbg(bond_dev
, "%s is NETIF_F_VLAN_CHALLENGED\n",
1364 if (vlan_uses_dev(bond_dev
)) {
1365 netdev_err(bond_dev
, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1366 slave_dev
->name
, bond_dev
->name
);
1369 netdev_warn(bond_dev
, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1370 slave_dev
->name
, slave_dev
->name
,
1374 netdev_dbg(bond_dev
, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1378 /* Old ifenslave binaries are no longer supported. These can
1379 * be identified with moderate accuracy by the state of the slave:
1380 * the current ifenslave will set the interface down prior to
1381 * enslaving it; the old ifenslave will not.
1383 if (slave_dev
->flags
& IFF_UP
) {
1384 netdev_err(bond_dev
, "%s is up - this may be due to an out of date ifenslave\n",
1389 /* set bonding device ether type by slave - bonding netdevices are
1390 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1391 * there is a need to override some of the type dependent attribs/funcs.
1393 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1394 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1396 if (!bond_has_slaves(bond
)) {
1397 if (bond_dev
->type
!= slave_dev
->type
) {
1398 netdev_dbg(bond_dev
, "change device type from %d to %d\n",
1399 bond_dev
->type
, slave_dev
->type
);
1401 res
= call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE
,
1403 res
= notifier_to_errno(res
);
1405 netdev_err(bond_dev
, "refused to change device type\n");
1409 /* Flush unicast and multicast addresses */
1410 dev_uc_flush(bond_dev
);
1411 dev_mc_flush(bond_dev
);
1413 if (slave_dev
->type
!= ARPHRD_ETHER
)
1414 bond_setup_by_slave(bond_dev
, slave_dev
);
1416 ether_setup(bond_dev
);
1417 bond_dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1420 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE
,
1423 } else if (bond_dev
->type
!= slave_dev
->type
) {
1424 netdev_err(bond_dev
, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1425 slave_dev
->name
, slave_dev
->type
, bond_dev
->type
);
1429 if (slave_dev
->type
== ARPHRD_INFINIBAND
&&
1430 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1431 netdev_warn(bond_dev
, "Type (%d) supports only active-backup mode\n",
1434 goto err_undo_flags
;
1437 if (!slave_ops
->ndo_set_mac_address
||
1438 slave_dev
->type
== ARPHRD_INFINIBAND
) {
1439 netdev_warn(bond_dev
, "The slave device specified does not support setting the MAC address\n");
1440 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
&&
1441 bond
->params
.fail_over_mac
!= BOND_FOM_ACTIVE
) {
1442 if (!bond_has_slaves(bond
)) {
1443 bond
->params
.fail_over_mac
= BOND_FOM_ACTIVE
;
1444 netdev_warn(bond_dev
, "Setting fail_over_mac to active for active-backup mode\n");
1446 netdev_err(bond_dev
, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1448 goto err_undo_flags
;
1453 call_netdevice_notifiers(NETDEV_JOIN
, slave_dev
);
1455 /* If this is the first slave, then we need to set the master's hardware
1456 * address to be the same as the slave's.
1458 if (!bond_has_slaves(bond
) &&
1459 bond
->dev
->addr_assign_type
== NET_ADDR_RANDOM
)
1460 bond_set_dev_addr(bond
->dev
, slave_dev
);
1462 new_slave
= bond_alloc_slave(bond
);
1465 goto err_undo_flags
;
1468 new_slave
->bond
= bond
;
1469 new_slave
->dev
= slave_dev
;
1470 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1471 * is set via sysfs or module option if desired.
1473 new_slave
->queue_id
= 0;
1475 /* Save slave's original mtu and then set it to match the bond */
1476 new_slave
->original_mtu
= slave_dev
->mtu
;
1477 res
= dev_set_mtu(slave_dev
, bond
->dev
->mtu
);
1479 netdev_dbg(bond_dev
, "Error %d calling dev_set_mtu\n", res
);
1483 /* Save slave's original ("permanent") mac address for modes
1484 * that need it, and for restoring it upon release, and then
1485 * set it to the master's address
1487 bond_hw_addr_copy(new_slave
->perm_hwaddr
, slave_dev
->dev_addr
,
1488 slave_dev
->addr_len
);
1490 if (!bond
->params
.fail_over_mac
||
1491 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1492 /* Set slave to master's mac address. The application already
1493 * set the master's mac address to that of the first slave
1495 memcpy(ss
.__data
, bond_dev
->dev_addr
, bond_dev
->addr_len
);
1496 ss
.ss_family
= slave_dev
->type
;
1497 res
= dev_set_mac_address(slave_dev
, (struct sockaddr
*)&ss
);
1499 netdev_dbg(bond_dev
, "Error %d calling set_mac_address\n", res
);
1500 goto err_restore_mtu
;
1504 /* set slave flag before open to prevent IPv6 addrconf */
1505 slave_dev
->flags
|= IFF_SLAVE
;
1507 /* open the slave since the application closed it */
1508 res
= dev_open(slave_dev
);
1510 netdev_dbg(bond_dev
, "Opening slave %s failed\n", slave_dev
->name
);
1511 goto err_restore_mac
;
1514 slave_dev
->priv_flags
|= IFF_BONDING
;
1515 /* initialize slave stats */
1516 dev_get_stats(new_slave
->dev
, &new_slave
->slave_stats
);
1518 if (bond_is_lb(bond
)) {
1519 /* bond_alb_init_slave() must be called before all other stages since
1520 * it might fail and we do not want to have to undo everything
1522 res
= bond_alb_init_slave(bond
, new_slave
);
1527 res
= vlan_vids_add_by_dev(slave_dev
, bond_dev
);
1529 netdev_err(bond_dev
, "Couldn't add bond vlan ids to %s\n",
1534 prev_slave
= bond_last_slave(bond
);
1536 new_slave
->delay
= 0;
1537 new_slave
->link_failure_count
= 0;
1539 if (bond_update_speed_duplex(new_slave
) &&
1540 bond_needs_speed_duplex(bond
))
1541 new_slave
->link
= BOND_LINK_DOWN
;
1543 new_slave
->last_rx
= jiffies
-
1544 (msecs_to_jiffies(bond
->params
.arp_interval
) + 1);
1545 for (i
= 0; i
< BOND_MAX_ARP_TARGETS
; i
++)
1546 new_slave
->target_last_arp_rx
[i
] = new_slave
->last_rx
;
1548 if (bond
->params
.miimon
&& !bond
->params
.use_carrier
) {
1549 link_reporting
= bond_check_dev_link(bond
, slave_dev
, 1);
1551 if ((link_reporting
== -1) && !bond
->params
.arp_interval
) {
1552 /* miimon is set but a bonded network driver
1553 * does not support ETHTOOL/MII and
1554 * arp_interval is not set. Note: if
1555 * use_carrier is enabled, we will never go
1556 * here (because netif_carrier is always
1557 * supported); thus, we don't need to change
1558 * the messages for netif_carrier.
1560 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",
1562 } else if (link_reporting
== -1) {
1563 /* unable get link status using mii/ethtool */
1564 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",
1569 /* check for initial state */
1570 new_slave
->link
= BOND_LINK_NOCHANGE
;
1571 if (bond
->params
.miimon
) {
1572 if (bond_check_dev_link(bond
, slave_dev
, 0) == BMSR_LSTATUS
) {
1573 if (bond
->params
.updelay
) {
1574 bond_set_slave_link_state(new_slave
,
1576 BOND_SLAVE_NOTIFY_NOW
);
1577 new_slave
->delay
= bond
->params
.updelay
;
1579 bond_set_slave_link_state(new_slave
,
1581 BOND_SLAVE_NOTIFY_NOW
);
1584 bond_set_slave_link_state(new_slave
, BOND_LINK_DOWN
,
1585 BOND_SLAVE_NOTIFY_NOW
);
1587 } else if (bond
->params
.arp_interval
) {
1588 bond_set_slave_link_state(new_slave
,
1589 (netif_carrier_ok(slave_dev
) ?
1590 BOND_LINK_UP
: BOND_LINK_DOWN
),
1591 BOND_SLAVE_NOTIFY_NOW
);
1593 bond_set_slave_link_state(new_slave
, BOND_LINK_UP
,
1594 BOND_SLAVE_NOTIFY_NOW
);
1597 if (new_slave
->link
!= BOND_LINK_DOWN
)
1598 new_slave
->last_link_up
= jiffies
;
1599 netdev_dbg(bond_dev
, "Initial state of slave_dev is BOND_LINK_%s\n",
1600 new_slave
->link
== BOND_LINK_DOWN
? "DOWN" :
1601 (new_slave
->link
== BOND_LINK_UP
? "UP" : "BACK"));
1603 if (bond_uses_primary(bond
) && bond
->params
.primary
[0]) {
1604 /* if there is a primary slave, remember it */
1605 if (strcmp(bond
->params
.primary
, new_slave
->dev
->name
) == 0) {
1606 rcu_assign_pointer(bond
->primary_slave
, new_slave
);
1607 bond
->force_primary
= true;
1611 switch (BOND_MODE(bond
)) {
1612 case BOND_MODE_ACTIVEBACKUP
:
1613 bond_set_slave_inactive_flags(new_slave
,
1614 BOND_SLAVE_NOTIFY_NOW
);
1616 case BOND_MODE_8023AD
:
1617 /* in 802.3ad mode, the internal mechanism
1618 * will activate the slaves in the selected
1621 bond_set_slave_inactive_flags(new_slave
, BOND_SLAVE_NOTIFY_NOW
);
1622 /* if this is the first slave */
1624 SLAVE_AD_INFO(new_slave
)->id
= 1;
1625 /* Initialize AD with the number of times that the AD timer is called in 1 second
1626 * can be called only after the mac address of the bond is set
1628 bond_3ad_initialize(bond
, 1000/AD_TIMER_INTERVAL
);
1630 SLAVE_AD_INFO(new_slave
)->id
=
1631 SLAVE_AD_INFO(prev_slave
)->id
+ 1;
1634 bond_3ad_bind_slave(new_slave
);
1638 bond_set_active_slave(new_slave
);
1639 bond_set_slave_inactive_flags(new_slave
, BOND_SLAVE_NOTIFY_NOW
);
1642 netdev_dbg(bond_dev
, "This slave is always active in trunk mode\n");
1644 /* always active in trunk mode */
1645 bond_set_active_slave(new_slave
);
1647 /* In trunking mode there is little meaning to curr_active_slave
1648 * anyway (it holds no special properties of the bond device),
1649 * so we can change it without calling change_active_interface()
1651 if (!rcu_access_pointer(bond
->curr_active_slave
) &&
1652 new_slave
->link
== BOND_LINK_UP
)
1653 rcu_assign_pointer(bond
->curr_active_slave
, new_slave
);
1656 } /* switch(bond_mode) */
1658 #ifdef CONFIG_NET_POLL_CONTROLLER
1659 slave_dev
->npinfo
= bond
->dev
->npinfo
;
1660 if (slave_dev
->npinfo
) {
1661 if (slave_enable_netpoll(new_slave
)) {
1662 netdev_info(bond_dev
, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1669 if (!(bond_dev
->features
& NETIF_F_LRO
))
1670 dev_disable_lro(slave_dev
);
1672 res
= netdev_rx_handler_register(slave_dev
, bond_handle_frame
,
1675 netdev_dbg(bond_dev
, "Error %d calling netdev_rx_handler_register\n", res
);
1679 res
= bond_master_upper_dev_link(bond
, new_slave
);
1681 netdev_dbg(bond_dev
, "Error %d calling bond_master_upper_dev_link\n", res
);
1682 goto err_unregister
;
1685 res
= bond_sysfs_slave_add(new_slave
);
1687 netdev_dbg(bond_dev
, "Error %d calling bond_sysfs_slave_add\n", res
);
1688 goto err_upper_unlink
;
1691 /* If the mode uses primary, then the following is handled by
1692 * bond_change_active_slave().
1694 if (!bond_uses_primary(bond
)) {
1695 /* set promiscuity level to new slave */
1696 if (bond_dev
->flags
& IFF_PROMISC
) {
1697 res
= dev_set_promiscuity(slave_dev
, 1);
1702 /* set allmulti level to new slave */
1703 if (bond_dev
->flags
& IFF_ALLMULTI
) {
1704 res
= dev_set_allmulti(slave_dev
, 1);
1706 if (bond_dev
->flags
& IFF_PROMISC
)
1707 dev_set_promiscuity(slave_dev
, -1);
1712 netif_addr_lock_bh(bond_dev
);
1713 dev_mc_sync_multiple(slave_dev
, bond_dev
);
1714 dev_uc_sync_multiple(slave_dev
, bond_dev
);
1715 netif_addr_unlock_bh(bond_dev
);
1717 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
1718 /* add lacpdu mc addr to mc list */
1719 u8 lacpdu_multicast
[ETH_ALEN
] = MULTICAST_LACPDU_ADDR
;
1721 dev_mc_add(slave_dev
, lacpdu_multicast
);
1726 bond_compute_features(bond
);
1727 bond_set_carrier(bond
);
1729 if (bond_uses_primary(bond
)) {
1731 bond_select_active_slave(bond
);
1732 unblock_netpoll_tx();
1735 if (bond_mode_uses_xmit_hash(bond
))
1736 bond_update_slave_arr(bond
, NULL
);
1738 netdev_info(bond_dev
, "Enslaving %s as %s interface with %s link\n",
1740 bond_is_active_slave(new_slave
) ? "an active" : "a backup",
1741 new_slave
->link
!= BOND_LINK_DOWN
? "an up" : "a down");
1743 /* enslave is successful */
1744 bond_queue_slave_event(new_slave
);
1747 /* Undo stages on error */
1749 bond_sysfs_slave_del(new_slave
);
1752 bond_upper_dev_unlink(bond
, new_slave
);
1755 netdev_rx_handler_unregister(slave_dev
);
1758 vlan_vids_del_by_dev(slave_dev
, bond_dev
);
1759 if (rcu_access_pointer(bond
->primary_slave
) == new_slave
)
1760 RCU_INIT_POINTER(bond
->primary_slave
, NULL
);
1761 if (rcu_access_pointer(bond
->curr_active_slave
) == new_slave
) {
1763 bond_change_active_slave(bond
, NULL
);
1764 bond_select_active_slave(bond
);
1765 unblock_netpoll_tx();
1767 /* either primary_slave or curr_active_slave might've changed */
1769 slave_disable_netpoll(new_slave
);
1772 slave_dev
->priv_flags
&= ~IFF_BONDING
;
1773 dev_close(slave_dev
);
1776 slave_dev
->flags
&= ~IFF_SLAVE
;
1777 if (!bond
->params
.fail_over_mac
||
1778 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1779 /* XXX TODO - fom follow mode needs to change master's
1780 * MAC if this slave's MAC is in use by the bond, or at
1781 * least print a warning.
1783 bond_hw_addr_copy(ss
.__data
, new_slave
->perm_hwaddr
,
1784 new_slave
->dev
->addr_len
);
1785 ss
.ss_family
= slave_dev
->type
;
1786 dev_set_mac_address(slave_dev
, (struct sockaddr
*)&ss
);
1790 dev_set_mtu(slave_dev
, new_slave
->original_mtu
);
1793 bond_free_slave(new_slave
);
1796 /* Enslave of first slave has failed and we need to fix master's mac */
1797 if (!bond_has_slaves(bond
)) {
1798 if (ether_addr_equal_64bits(bond_dev
->dev_addr
,
1799 slave_dev
->dev_addr
))
1800 eth_hw_addr_random(bond_dev
);
1801 if (bond_dev
->type
!= ARPHRD_ETHER
) {
1802 dev_close(bond_dev
);
1803 ether_setup(bond_dev
);
1804 bond_dev
->flags
|= IFF_MASTER
;
1805 bond_dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1812 /* Try to release the slave device <slave> from the bond device <master>
1813 * It is legal to access curr_active_slave without a lock because all the function
1814 * is RTNL-locked. If "all" is true it means that the function is being called
1815 * while destroying a bond interface and all slaves are being released.
1817 * The rules for slave state should be:
1818 * for Active/Backup:
1819 * Active stays on all backups go down
1820 * for Bonded connections:
1821 * The first up interface should be left on and all others downed.
1823 static int __bond_release_one(struct net_device
*bond_dev
,
1824 struct net_device
*slave_dev
,
1825 bool all
, bool unregister
)
1827 struct bonding
*bond
= netdev_priv(bond_dev
);
1828 struct slave
*slave
, *oldcurrent
;
1829 struct sockaddr_storage ss
;
1830 int old_flags
= bond_dev
->flags
;
1831 netdev_features_t old_features
= bond_dev
->features
;
1833 /* slave is not a slave or master is not master of this slave */
1834 if (!(slave_dev
->flags
& IFF_SLAVE
) ||
1835 !netdev_has_upper_dev(slave_dev
, bond_dev
)) {
1836 netdev_dbg(bond_dev
, "cannot release %s\n",
1843 slave
= bond_get_slave_by_dev(bond
, slave_dev
);
1845 /* not a slave of this bond */
1846 netdev_info(bond_dev
, "%s not enslaved\n",
1848 unblock_netpoll_tx();
1852 bond_set_slave_inactive_flags(slave
, BOND_SLAVE_NOTIFY_NOW
);
1854 bond_sysfs_slave_del(slave
);
1856 /* recompute stats just before removing the slave */
1857 bond_get_stats(bond
->dev
, &bond
->bond_stats
);
1859 bond_upper_dev_unlink(bond
, slave
);
1860 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1861 * for this slave anymore.
1863 netdev_rx_handler_unregister(slave_dev
);
1865 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
1866 bond_3ad_unbind_slave(slave
);
1868 if (bond_mode_uses_xmit_hash(bond
))
1869 bond_update_slave_arr(bond
, slave
);
1871 netdev_info(bond_dev
, "Releasing %s interface %s\n",
1872 bond_is_active_slave(slave
) ? "active" : "backup",
1875 oldcurrent
= rcu_access_pointer(bond
->curr_active_slave
);
1877 RCU_INIT_POINTER(bond
->current_arp_slave
, NULL
);
1879 if (!all
&& (!bond
->params
.fail_over_mac
||
1880 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
)) {
1881 if (ether_addr_equal_64bits(bond_dev
->dev_addr
, slave
->perm_hwaddr
) &&
1882 bond_has_slaves(bond
))
1883 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",
1884 slave_dev
->name
, slave
->perm_hwaddr
,
1885 bond_dev
->name
, slave_dev
->name
);
1888 if (rtnl_dereference(bond
->primary_slave
) == slave
)
1889 RCU_INIT_POINTER(bond
->primary_slave
, NULL
);
1891 if (oldcurrent
== slave
)
1892 bond_change_active_slave(bond
, NULL
);
1894 if (bond_is_lb(bond
)) {
1895 /* Must be called only after the slave has been
1896 * detached from the list and the curr_active_slave
1897 * has been cleared (if our_slave == old_current),
1898 * but before a new active slave is selected.
1900 bond_alb_deinit_slave(bond
, slave
);
1904 RCU_INIT_POINTER(bond
->curr_active_slave
, NULL
);
1905 } else if (oldcurrent
== slave
) {
1906 /* Note that we hold RTNL over this sequence, so there
1907 * is no concern that another slave add/remove event
1910 bond_select_active_slave(bond
);
1913 if (!bond_has_slaves(bond
)) {
1914 bond_set_carrier(bond
);
1915 eth_hw_addr_random(bond_dev
);
1918 unblock_netpoll_tx();
1922 if (!bond_has_slaves(bond
)) {
1923 call_netdevice_notifiers(NETDEV_CHANGEADDR
, bond
->dev
);
1924 call_netdevice_notifiers(NETDEV_RELEASE
, bond
->dev
);
1927 bond_compute_features(bond
);
1928 if (!(bond_dev
->features
& NETIF_F_VLAN_CHALLENGED
) &&
1929 (old_features
& NETIF_F_VLAN_CHALLENGED
))
1930 netdev_info(bond_dev
, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1931 slave_dev
->name
, bond_dev
->name
);
1933 vlan_vids_del_by_dev(slave_dev
, bond_dev
);
1935 /* If the mode uses primary, then this case was handled above by
1936 * bond_change_active_slave(..., NULL)
1938 if (!bond_uses_primary(bond
)) {
1939 /* unset promiscuity level from slave
1940 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1941 * of the IFF_PROMISC flag in the bond_dev, but we need the
1942 * value of that flag before that change, as that was the value
1943 * when this slave was attached, so we cache at the start of the
1944 * function and use it here. Same goes for ALLMULTI below
1946 if (old_flags
& IFF_PROMISC
)
1947 dev_set_promiscuity(slave_dev
, -1);
1949 /* unset allmulti level from slave */
1950 if (old_flags
& IFF_ALLMULTI
)
1951 dev_set_allmulti(slave_dev
, -1);
1953 bond_hw_addr_flush(bond_dev
, slave_dev
);
1956 slave_disable_netpoll(slave
);
1958 /* close slave before restoring its mac address */
1959 dev_close(slave_dev
);
1961 if (bond
->params
.fail_over_mac
!= BOND_FOM_ACTIVE
||
1962 BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
1963 /* restore original ("permanent") mac address */
1964 bond_hw_addr_copy(ss
.__data
, slave
->perm_hwaddr
,
1965 slave
->dev
->addr_len
);
1966 ss
.ss_family
= slave_dev
->type
;
1967 dev_set_mac_address(slave_dev
, (struct sockaddr
*)&ss
);
1971 __dev_set_mtu(slave_dev
, slave
->original_mtu
);
1973 dev_set_mtu(slave_dev
, slave
->original_mtu
);
1975 slave_dev
->priv_flags
&= ~IFF_BONDING
;
1977 bond_free_slave(slave
);
1982 /* A wrapper used because of ndo_del_link */
1983 int bond_release(struct net_device
*bond_dev
, struct net_device
*slave_dev
)
1985 return __bond_release_one(bond_dev
, slave_dev
, false, false);
1988 /* First release a slave and then destroy the bond if no more slaves are left.
1989 * Must be under rtnl_lock when this function is called.
1991 static int bond_release_and_destroy(struct net_device
*bond_dev
,
1992 struct net_device
*slave_dev
)
1994 struct bonding
*bond
= netdev_priv(bond_dev
);
1997 ret
= __bond_release_one(bond_dev
, slave_dev
, false, true);
1998 if (ret
== 0 && !bond_has_slaves(bond
)) {
1999 bond_dev
->priv_flags
|= IFF_DISABLE_NETPOLL
;
2000 netdev_info(bond_dev
, "Destroying bond %s\n",
2002 bond_remove_proc_entry(bond
);
2003 unregister_netdevice(bond_dev
);
2008 static void bond_info_query(struct net_device
*bond_dev
, struct ifbond
*info
)
2010 struct bonding
*bond
= netdev_priv(bond_dev
);
2011 bond_fill_ifbond(bond
, info
);
2014 static int bond_slave_info_query(struct net_device
*bond_dev
, struct ifslave
*info
)
2016 struct bonding
*bond
= netdev_priv(bond_dev
);
2017 struct list_head
*iter
;
2018 int i
= 0, res
= -ENODEV
;
2019 struct slave
*slave
;
2021 bond_for_each_slave(bond
, slave
, iter
) {
2022 if (i
++ == (int)info
->slave_id
) {
2024 bond_fill_ifslave(slave
, info
);
2032 /*-------------------------------- Monitoring -------------------------------*/
2034 /* called with rcu_read_lock() */
2035 static int bond_miimon_inspect(struct bonding
*bond
)
2037 int link_state
, commit
= 0;
2038 struct list_head
*iter
;
2039 struct slave
*slave
;
2040 bool ignore_updelay
;
2042 ignore_updelay
= !rcu_dereference(bond
->curr_active_slave
);
2044 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2045 slave
->new_link
= BOND_LINK_NOCHANGE
;
2046 slave
->link_new_state
= slave
->link
;
2048 link_state
= bond_check_dev_link(bond
, slave
->dev
, 0);
2050 switch (slave
->link
) {
2055 bond_propose_link_state(slave
, BOND_LINK_FAIL
);
2057 slave
->delay
= bond
->params
.downdelay
;
2059 netdev_info(bond
->dev
, "link status down for %sinterface %s, disabling it in %d ms\n",
2061 BOND_MODE_ACTIVEBACKUP
) ?
2062 (bond_is_active_slave(slave
) ?
2063 "active " : "backup ") : "",
2065 bond
->params
.downdelay
* bond
->params
.miimon
);
2068 case BOND_LINK_FAIL
:
2070 /* recovered before downdelay expired */
2071 bond_propose_link_state(slave
, BOND_LINK_UP
);
2072 slave
->last_link_up
= jiffies
;
2073 netdev_info(bond
->dev
, "link status up again after %d ms for interface %s\n",
2074 (bond
->params
.downdelay
- slave
->delay
) *
2075 bond
->params
.miimon
,
2081 if (slave
->delay
<= 0) {
2082 slave
->new_link
= BOND_LINK_DOWN
;
2090 case BOND_LINK_DOWN
:
2094 bond_propose_link_state(slave
, BOND_LINK_BACK
);
2096 slave
->delay
= bond
->params
.updelay
;
2099 netdev_info(bond
->dev
, "link status up for interface %s, enabling it in %d ms\n",
2101 ignore_updelay
? 0 :
2102 bond
->params
.updelay
*
2103 bond
->params
.miimon
);
2106 case BOND_LINK_BACK
:
2108 bond_propose_link_state(slave
, BOND_LINK_DOWN
);
2109 netdev_info(bond
->dev
, "link status down again after %d ms for interface %s\n",
2110 (bond
->params
.updelay
- slave
->delay
) *
2111 bond
->params
.miimon
,
2120 if (slave
->delay
<= 0) {
2121 slave
->new_link
= BOND_LINK_UP
;
2123 ignore_updelay
= false;
2135 static void bond_miimon_commit(struct bonding
*bond
)
2137 struct list_head
*iter
;
2138 struct slave
*slave
, *primary
;
2140 bond_for_each_slave(bond
, slave
, iter
) {
2141 switch (slave
->new_link
) {
2142 case BOND_LINK_NOCHANGE
:
2146 if (bond_update_speed_duplex(slave
) &&
2147 bond_needs_speed_duplex(bond
)) {
2148 slave
->link
= BOND_LINK_DOWN
;
2149 if (net_ratelimit())
2150 netdev_warn(bond
->dev
,
2151 "failed to get link speed/duplex for %s\n",
2155 bond_set_slave_link_state(slave
, BOND_LINK_UP
,
2156 BOND_SLAVE_NOTIFY_NOW
);
2157 slave
->last_link_up
= jiffies
;
2159 primary
= rtnl_dereference(bond
->primary_slave
);
2160 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
2161 /* prevent it from being the active one */
2162 bond_set_backup_slave(slave
);
2163 } else if (BOND_MODE(bond
) != BOND_MODE_ACTIVEBACKUP
) {
2164 /* make it immediately active */
2165 bond_set_active_slave(slave
);
2166 } else if (slave
!= primary
) {
2167 /* prevent it from being the active one */
2168 bond_set_backup_slave(slave
);
2171 netdev_info(bond
->dev
, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2173 slave
->speed
== SPEED_UNKNOWN
? 0 : slave
->speed
,
2174 slave
->duplex
? "full" : "half");
2176 /* notify ad that the link status has changed */
2177 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
2178 bond_3ad_handle_link_change(slave
, BOND_LINK_UP
);
2180 if (bond_is_lb(bond
))
2181 bond_alb_handle_link_change(bond
, slave
,
2184 if (BOND_MODE(bond
) == BOND_MODE_XOR
)
2185 bond_update_slave_arr(bond
, NULL
);
2187 if (!bond
->curr_active_slave
|| slave
== primary
)
2192 case BOND_LINK_DOWN
:
2193 if (slave
->link_failure_count
< UINT_MAX
)
2194 slave
->link_failure_count
++;
2196 bond_set_slave_link_state(slave
, BOND_LINK_DOWN
,
2197 BOND_SLAVE_NOTIFY_NOW
);
2199 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
||
2200 BOND_MODE(bond
) == BOND_MODE_8023AD
)
2201 bond_set_slave_inactive_flags(slave
,
2202 BOND_SLAVE_NOTIFY_NOW
);
2204 netdev_info(bond
->dev
, "link status definitely down for interface %s, disabling it\n",
2207 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
2208 bond_3ad_handle_link_change(slave
,
2211 if (bond_is_lb(bond
))
2212 bond_alb_handle_link_change(bond
, slave
,
2215 if (BOND_MODE(bond
) == BOND_MODE_XOR
)
2216 bond_update_slave_arr(bond
, NULL
);
2218 if (slave
== rcu_access_pointer(bond
->curr_active_slave
))
2224 netdev_err(bond
->dev
, "invalid new link %d on slave %s\n",
2225 slave
->new_link
, slave
->dev
->name
);
2226 slave
->new_link
= BOND_LINK_NOCHANGE
;
2233 bond_select_active_slave(bond
);
2234 unblock_netpoll_tx();
2237 bond_set_carrier(bond
);
2242 * Really a wrapper that splits the mii monitor into two phases: an
2243 * inspection, then (if inspection indicates something needs to be done)
2244 * an acquisition of appropriate locks followed by a commit phase to
2245 * implement whatever link state changes are indicated.
2247 static void bond_mii_monitor(struct work_struct
*work
)
2249 struct bonding
*bond
= container_of(work
, struct bonding
,
2251 bool should_notify_peers
= false;
2252 unsigned long delay
;
2253 struct slave
*slave
;
2254 struct list_head
*iter
;
2256 delay
= msecs_to_jiffies(bond
->params
.miimon
);
2258 if (!bond_has_slaves(bond
))
2263 should_notify_peers
= bond_should_notify_peers(bond
);
2265 if (bond_miimon_inspect(bond
)) {
2268 /* Race avoidance with bond_close cancel of workqueue */
2269 if (!rtnl_trylock()) {
2271 should_notify_peers
= false;
2275 bond_for_each_slave(bond
, slave
, iter
) {
2276 bond_commit_link_state(slave
, BOND_SLAVE_NOTIFY_LATER
);
2278 bond_miimon_commit(bond
);
2280 rtnl_unlock(); /* might sleep, hold no other locks */
2285 if (bond
->params
.miimon
)
2286 queue_delayed_work(bond
->wq
, &bond
->mii_work
, delay
);
2288 if (should_notify_peers
) {
2289 if (!rtnl_trylock())
2291 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, bond
->dev
);
2296 static int bond_upper_dev_walk(struct net_device
*upper
, void *data
)
2298 __be32 ip
= *((__be32
*)data
);
2300 return ip
== bond_confirm_addr(upper
, 0, ip
);
2303 static bool bond_has_this_ip(struct bonding
*bond
, __be32 ip
)
2307 if (ip
== bond_confirm_addr(bond
->dev
, 0, ip
))
2311 if (netdev_walk_all_upper_dev_rcu(bond
->dev
, bond_upper_dev_walk
, &ip
))
2318 /* We go to the (large) trouble of VLAN tagging ARP frames because
2319 * switches in VLAN mode (especially if ports are configured as
2320 * "native" to a VLAN) might not pass non-tagged frames.
2322 static void bond_arp_send(struct net_device
*slave_dev
, int arp_op
,
2323 __be32 dest_ip
, __be32 src_ip
,
2324 struct bond_vlan_tag
*tags
)
2326 struct sk_buff
*skb
;
2327 struct bond_vlan_tag
*outer_tag
= tags
;
2329 netdev_dbg(slave_dev
, "arp %d on slave %s: dst %pI4 src %pI4\n",
2330 arp_op
, slave_dev
->name
, &dest_ip
, &src_ip
);
2332 skb
= arp_create(arp_op
, ETH_P_ARP
, dest_ip
, slave_dev
, src_ip
,
2333 NULL
, slave_dev
->dev_addr
, NULL
);
2336 net_err_ratelimited("ARP packet allocation failed\n");
2340 if (!tags
|| tags
->vlan_proto
== VLAN_N_VID
)
2345 /* Go through all the tags backwards and add them to the packet */
2346 while (tags
->vlan_proto
!= VLAN_N_VID
) {
2347 if (!tags
->vlan_id
) {
2352 netdev_dbg(slave_dev
, "inner tag: proto %X vid %X\n",
2353 ntohs(outer_tag
->vlan_proto
), tags
->vlan_id
);
2354 skb
= vlan_insert_tag_set_proto(skb
, tags
->vlan_proto
,
2357 net_err_ratelimited("failed to insert inner VLAN tag\n");
2363 /* Set the outer tag */
2364 if (outer_tag
->vlan_id
) {
2365 netdev_dbg(slave_dev
, "outer tag: proto %X vid %X\n",
2366 ntohs(outer_tag
->vlan_proto
), outer_tag
->vlan_id
);
2367 __vlan_hwaccel_put_tag(skb
, outer_tag
->vlan_proto
,
2368 outer_tag
->vlan_id
);
2375 /* Validate the device path between the @start_dev and the @end_dev.
2376 * The path is valid if the @end_dev is reachable through device
2378 * When the path is validated, collect any vlan information in the
2381 struct bond_vlan_tag
*bond_verify_device_path(struct net_device
*start_dev
,
2382 struct net_device
*end_dev
,
2385 struct bond_vlan_tag
*tags
;
2386 struct net_device
*upper
;
2387 struct list_head
*iter
;
2389 if (start_dev
== end_dev
) {
2390 tags
= kzalloc(sizeof(*tags
) * (level
+ 1), GFP_ATOMIC
);
2392 return ERR_PTR(-ENOMEM
);
2393 tags
[level
].vlan_proto
= VLAN_N_VID
;
2397 netdev_for_each_upper_dev_rcu(start_dev
, upper
, iter
) {
2398 tags
= bond_verify_device_path(upper
, end_dev
, level
+ 1);
2399 if (IS_ERR_OR_NULL(tags
)) {
2404 if (is_vlan_dev(upper
)) {
2405 tags
[level
].vlan_proto
= vlan_dev_vlan_proto(upper
);
2406 tags
[level
].vlan_id
= vlan_dev_vlan_id(upper
);
2415 static void bond_arp_send_all(struct bonding
*bond
, struct slave
*slave
)
2418 struct bond_vlan_tag
*tags
;
2419 __be32
*targets
= bond
->params
.arp_targets
, addr
;
2422 for (i
= 0; i
< BOND_MAX_ARP_TARGETS
&& targets
[i
]; i
++) {
2423 netdev_dbg(bond
->dev
, "basa: target %pI4\n", &targets
[i
]);
2426 /* Find out through which dev should the packet go */
2427 rt
= ip_route_output(dev_net(bond
->dev
), targets
[i
], 0,
2430 /* there's no route to target - try to send arp
2431 * probe to generate any traffic (arp_validate=0)
2433 if (bond
->params
.arp_validate
)
2434 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2437 bond_arp_send(slave
->dev
, ARPOP_REQUEST
, targets
[i
],
2442 /* bond device itself */
2443 if (rt
->dst
.dev
== bond
->dev
)
2447 tags
= bond_verify_device_path(bond
->dev
, rt
->dst
.dev
, 0);
2450 if (!IS_ERR_OR_NULL(tags
))
2453 /* Not our device - skip */
2454 netdev_dbg(bond
->dev
, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2455 &targets
[i
], rt
->dst
.dev
? rt
->dst
.dev
->name
: "NULL");
2461 addr
= bond_confirm_addr(rt
->dst
.dev
, targets
[i
], 0);
2463 bond_arp_send(slave
->dev
, ARPOP_REQUEST
, targets
[i
],
2469 static void bond_validate_arp(struct bonding
*bond
, struct slave
*slave
, __be32 sip
, __be32 tip
)
2473 if (!sip
|| !bond_has_this_ip(bond
, tip
)) {
2474 netdev_dbg(bond
->dev
, "bva: sip %pI4 tip %pI4 not found\n",
2479 i
= bond_get_targets_ip(bond
->params
.arp_targets
, sip
);
2481 netdev_dbg(bond
->dev
, "bva: sip %pI4 not found in targets\n",
2485 slave
->last_rx
= jiffies
;
2486 slave
->target_last_arp_rx
[i
] = jiffies
;
2489 int bond_arp_rcv(const struct sk_buff
*skb
, struct bonding
*bond
,
2490 struct slave
*slave
)
2492 struct arphdr
*arp
= (struct arphdr
*)skb
->data
;
2493 struct slave
*curr_active_slave
, *curr_arp_slave
;
2494 unsigned char *arp_ptr
;
2496 int alen
, is_arp
= skb
->protocol
== __cpu_to_be16(ETH_P_ARP
);
2498 if (!slave_do_arp_validate(bond
, slave
)) {
2499 if ((slave_do_arp_validate_only(bond
) && is_arp
) ||
2500 !slave_do_arp_validate_only(bond
))
2501 slave
->last_rx
= jiffies
;
2502 return RX_HANDLER_ANOTHER
;
2503 } else if (!is_arp
) {
2504 return RX_HANDLER_ANOTHER
;
2507 alen
= arp_hdr_len(bond
->dev
);
2509 netdev_dbg(bond
->dev
, "bond_arp_rcv: skb->dev %s\n",
2512 if (alen
> skb_headlen(skb
)) {
2513 arp
= kmalloc(alen
, GFP_ATOMIC
);
2516 if (skb_copy_bits(skb
, 0, arp
, alen
) < 0)
2520 if (arp
->ar_hln
!= bond
->dev
->addr_len
||
2521 skb
->pkt_type
== PACKET_OTHERHOST
||
2522 skb
->pkt_type
== PACKET_LOOPBACK
||
2523 arp
->ar_hrd
!= htons(ARPHRD_ETHER
) ||
2524 arp
->ar_pro
!= htons(ETH_P_IP
) ||
2528 arp_ptr
= (unsigned char *)(arp
+ 1);
2529 arp_ptr
+= bond
->dev
->addr_len
;
2530 memcpy(&sip
, arp_ptr
, 4);
2531 arp_ptr
+= 4 + bond
->dev
->addr_len
;
2532 memcpy(&tip
, arp_ptr
, 4);
2534 netdev_dbg(bond
->dev
, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2535 slave
->dev
->name
, bond_slave_state(slave
),
2536 bond
->params
.arp_validate
, slave_do_arp_validate(bond
, slave
),
2539 curr_active_slave
= rcu_dereference(bond
->curr_active_slave
);
2540 curr_arp_slave
= rcu_dereference(bond
->current_arp_slave
);
2542 /* We 'trust' the received ARP enough to validate it if:
2544 * (a) the slave receiving the ARP is active (which includes the
2545 * current ARP slave, if any), or
2547 * (b) the receiving slave isn't active, but there is a currently
2548 * active slave and it received valid arp reply(s) after it became
2549 * the currently active slave, or
2551 * (c) there is an ARP slave that sent an ARP during the prior ARP
2552 * interval, and we receive an ARP reply on any slave. We accept
2553 * these because switch FDB update delays may deliver the ARP
2554 * reply to a slave other than the sender of the ARP request.
2556 * Note: for (b), backup slaves are receiving the broadcast ARP
2557 * request, not a reply. This request passes from the sending
2558 * slave through the L2 switch(es) to the receiving slave. Since
2559 * this is checking the request, sip/tip are swapped for
2562 * This is done to avoid endless looping when we can't reach the
2563 * arp_ip_target and fool ourselves with our own arp requests.
2565 if (bond_is_active_slave(slave
))
2566 bond_validate_arp(bond
, slave
, sip
, tip
);
2567 else if (curr_active_slave
&&
2568 time_after(slave_last_rx(bond
, curr_active_slave
),
2569 curr_active_slave
->last_link_up
))
2570 bond_validate_arp(bond
, slave
, tip
, sip
);
2571 else if (curr_arp_slave
&& (arp
->ar_op
== htons(ARPOP_REPLY
)) &&
2572 bond_time_in_interval(bond
,
2573 dev_trans_start(curr_arp_slave
->dev
), 1))
2574 bond_validate_arp(bond
, slave
, sip
, tip
);
2577 if (arp
!= (struct arphdr
*)skb
->data
)
2579 return RX_HANDLER_ANOTHER
;
2582 /* function to verify if we're in the arp_interval timeslice, returns true if
2583 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2584 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2586 static bool bond_time_in_interval(struct bonding
*bond
, unsigned long last_act
,
2589 int delta_in_ticks
= msecs_to_jiffies(bond
->params
.arp_interval
);
2591 return time_in_range(jiffies
,
2592 last_act
- delta_in_ticks
,
2593 last_act
+ mod
* delta_in_ticks
+ delta_in_ticks
/2);
2596 /* This function is called regularly to monitor each slave's link
2597 * ensuring that traffic is being sent and received when arp monitoring
2598 * is used in load-balancing mode. if the adapter has been dormant, then an
2599 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2600 * arp monitoring in active backup mode.
2602 static void bond_loadbalance_arp_mon(struct bonding
*bond
)
2604 struct slave
*slave
, *oldcurrent
;
2605 struct list_head
*iter
;
2606 int do_failover
= 0, slave_state_changed
= 0;
2608 if (!bond_has_slaves(bond
))
2613 oldcurrent
= rcu_dereference(bond
->curr_active_slave
);
2614 /* see if any of the previous devices are up now (i.e. they have
2615 * xmt and rcv traffic). the curr_active_slave does not come into
2616 * the picture unless it is null. also, slave->last_link_up is not
2617 * needed here because we send an arp on each slave and give a slave
2618 * as long as it needs to get the tx/rx within the delta.
2619 * TODO: what about up/down delay in arp mode? it wasn't here before
2622 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2623 unsigned long trans_start
= dev_trans_start(slave
->dev
);
2625 slave
->new_link
= BOND_LINK_NOCHANGE
;
2627 if (slave
->link
!= BOND_LINK_UP
) {
2628 if (bond_time_in_interval(bond
, trans_start
, 1) &&
2629 bond_time_in_interval(bond
, slave
->last_rx
, 1)) {
2631 slave
->new_link
= BOND_LINK_UP
;
2632 slave_state_changed
= 1;
2634 /* primary_slave has no meaning in round-robin
2635 * mode. the window of a slave being up and
2636 * curr_active_slave being null after enslaving
2640 netdev_info(bond
->dev
, "link status definitely up for interface %s\n",
2644 netdev_info(bond
->dev
, "interface %s is now up\n",
2649 /* slave->link == BOND_LINK_UP */
2651 /* not all switches will respond to an arp request
2652 * when the source ip is 0, so don't take the link down
2653 * if we don't know our ip yet
2655 if (!bond_time_in_interval(bond
, trans_start
, 2) ||
2656 !bond_time_in_interval(bond
, slave
->last_rx
, 2)) {
2658 slave
->new_link
= BOND_LINK_DOWN
;
2659 slave_state_changed
= 1;
2661 if (slave
->link_failure_count
< UINT_MAX
)
2662 slave
->link_failure_count
++;
2664 netdev_info(bond
->dev
, "interface %s is now down\n",
2667 if (slave
== oldcurrent
)
2672 /* note: if switch is in round-robin mode, all links
2673 * must tx arp to ensure all links rx an arp - otherwise
2674 * links may oscillate or not come up at all; if switch is
2675 * in something like xor mode, there is nothing we can
2676 * do - all replies will be rx'ed on same link causing slaves
2677 * to be unstable during low/no traffic periods
2679 if (bond_slave_is_up(slave
))
2680 bond_arp_send_all(bond
, slave
);
2685 if (do_failover
|| slave_state_changed
) {
2686 if (!rtnl_trylock())
2689 bond_for_each_slave(bond
, slave
, iter
) {
2690 if (slave
->new_link
!= BOND_LINK_NOCHANGE
)
2691 slave
->link
= slave
->new_link
;
2694 if (slave_state_changed
) {
2695 bond_slave_state_change(bond
);
2696 if (BOND_MODE(bond
) == BOND_MODE_XOR
)
2697 bond_update_slave_arr(bond
, NULL
);
2701 bond_select_active_slave(bond
);
2702 unblock_netpoll_tx();
2708 if (bond
->params
.arp_interval
)
2709 queue_delayed_work(bond
->wq
, &bond
->arp_work
,
2710 msecs_to_jiffies(bond
->params
.arp_interval
));
2713 /* Called to inspect slaves for active-backup mode ARP monitor link state
2714 * changes. Sets new_link in slaves to specify what action should take
2715 * place for the slave. Returns 0 if no changes are found, >0 if changes
2716 * to link states must be committed.
2718 * Called with rcu_read_lock held.
2720 static int bond_ab_arp_inspect(struct bonding
*bond
)
2722 unsigned long trans_start
, last_rx
;
2723 struct list_head
*iter
;
2724 struct slave
*slave
;
2727 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2728 slave
->new_link
= BOND_LINK_NOCHANGE
;
2729 last_rx
= slave_last_rx(bond
, slave
);
2731 if (slave
->link
!= BOND_LINK_UP
) {
2732 if (bond_time_in_interval(bond
, last_rx
, 1)) {
2733 slave
->new_link
= BOND_LINK_UP
;
2739 /* Give slaves 2*delta after being enslaved or made
2740 * active. This avoids bouncing, as the last receive
2741 * times need a full ARP monitor cycle to be updated.
2743 if (bond_time_in_interval(bond
, slave
->last_link_up
, 2))
2746 /* Backup slave is down if:
2747 * - No current_arp_slave AND
2748 * - more than 3*delta since last receive AND
2749 * - the bond has an IP address
2751 * Note: a non-null current_arp_slave indicates
2752 * the curr_active_slave went down and we are
2753 * searching for a new one; under this condition
2754 * we only take the curr_active_slave down - this
2755 * gives each slave a chance to tx/rx traffic
2756 * before being taken out
2758 if (!bond_is_active_slave(slave
) &&
2759 !rcu_access_pointer(bond
->current_arp_slave
) &&
2760 !bond_time_in_interval(bond
, last_rx
, 3)) {
2761 slave
->new_link
= BOND_LINK_DOWN
;
2765 /* Active slave is down if:
2766 * - more than 2*delta since transmitting OR
2767 * - (more than 2*delta since receive AND
2768 * the bond has an IP address)
2770 trans_start
= dev_trans_start(slave
->dev
);
2771 if (bond_is_active_slave(slave
) &&
2772 (!bond_time_in_interval(bond
, trans_start
, 2) ||
2773 !bond_time_in_interval(bond
, last_rx
, 2))) {
2774 slave
->new_link
= BOND_LINK_DOWN
;
2782 /* Called to commit link state changes noted by inspection step of
2783 * active-backup mode ARP monitor.
2785 * Called with RTNL hold.
2787 static void bond_ab_arp_commit(struct bonding
*bond
)
2789 unsigned long trans_start
;
2790 struct list_head
*iter
;
2791 struct slave
*slave
;
2793 bond_for_each_slave(bond
, slave
, iter
) {
2794 switch (slave
->new_link
) {
2795 case BOND_LINK_NOCHANGE
:
2799 trans_start
= dev_trans_start(slave
->dev
);
2800 if (rtnl_dereference(bond
->curr_active_slave
) != slave
||
2801 (!rtnl_dereference(bond
->curr_active_slave
) &&
2802 bond_time_in_interval(bond
, trans_start
, 1))) {
2803 struct slave
*current_arp_slave
;
2805 current_arp_slave
= rtnl_dereference(bond
->current_arp_slave
);
2806 bond_set_slave_link_state(slave
, BOND_LINK_UP
,
2807 BOND_SLAVE_NOTIFY_NOW
);
2808 if (current_arp_slave
) {
2809 bond_set_slave_inactive_flags(
2811 BOND_SLAVE_NOTIFY_NOW
);
2812 RCU_INIT_POINTER(bond
->current_arp_slave
, NULL
);
2815 netdev_info(bond
->dev
, "link status definitely up for interface %s\n",
2818 if (!rtnl_dereference(bond
->curr_active_slave
) ||
2819 slave
== rtnl_dereference(bond
->primary_slave
))
2826 case BOND_LINK_DOWN
:
2827 if (slave
->link_failure_count
< UINT_MAX
)
2828 slave
->link_failure_count
++;
2830 bond_set_slave_link_state(slave
, BOND_LINK_DOWN
,
2831 BOND_SLAVE_NOTIFY_NOW
);
2832 bond_set_slave_inactive_flags(slave
,
2833 BOND_SLAVE_NOTIFY_NOW
);
2835 netdev_info(bond
->dev
, "link status definitely down for interface %s, disabling it\n",
2838 if (slave
== rtnl_dereference(bond
->curr_active_slave
)) {
2839 RCU_INIT_POINTER(bond
->current_arp_slave
, NULL
);
2846 netdev_err(bond
->dev
, "impossible: new_link %d on slave %s\n",
2847 slave
->new_link
, slave
->dev
->name
);
2853 bond_select_active_slave(bond
);
2854 unblock_netpoll_tx();
2857 bond_set_carrier(bond
);
2860 /* Send ARP probes for active-backup mode ARP monitor.
2862 * Called with rcu_read_lock held.
2864 static bool bond_ab_arp_probe(struct bonding
*bond
)
2866 struct slave
*slave
, *before
= NULL
, *new_slave
= NULL
,
2867 *curr_arp_slave
= rcu_dereference(bond
->current_arp_slave
),
2868 *curr_active_slave
= rcu_dereference(bond
->curr_active_slave
);
2869 struct list_head
*iter
;
2871 bool should_notify_rtnl
= BOND_SLAVE_NOTIFY_LATER
;
2873 if (curr_arp_slave
&& curr_active_slave
)
2874 netdev_info(bond
->dev
, "PROBE: c_arp %s && cas %s BAD\n",
2875 curr_arp_slave
->dev
->name
,
2876 curr_active_slave
->dev
->name
);
2878 if (curr_active_slave
) {
2879 bond_arp_send_all(bond
, curr_active_slave
);
2880 return should_notify_rtnl
;
2883 /* if we don't have a curr_active_slave, search for the next available
2884 * backup slave from the current_arp_slave and make it the candidate
2885 * for becoming the curr_active_slave
2888 if (!curr_arp_slave
) {
2889 curr_arp_slave
= bond_first_slave_rcu(bond
);
2890 if (!curr_arp_slave
)
2891 return should_notify_rtnl
;
2894 bond_set_slave_inactive_flags(curr_arp_slave
, BOND_SLAVE_NOTIFY_LATER
);
2896 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2897 if (!found
&& !before
&& bond_slave_is_up(slave
))
2900 if (found
&& !new_slave
&& bond_slave_is_up(slave
))
2902 /* if the link state is up at this point, we
2903 * mark it down - this can happen if we have
2904 * simultaneous link failures and
2905 * reselect_active_interface doesn't make this
2906 * one the current slave so it is still marked
2907 * up when it is actually down
2909 if (!bond_slave_is_up(slave
) && slave
->link
== BOND_LINK_UP
) {
2910 bond_set_slave_link_state(slave
, BOND_LINK_DOWN
,
2911 BOND_SLAVE_NOTIFY_LATER
);
2912 if (slave
->link_failure_count
< UINT_MAX
)
2913 slave
->link_failure_count
++;
2915 bond_set_slave_inactive_flags(slave
,
2916 BOND_SLAVE_NOTIFY_LATER
);
2918 netdev_info(bond
->dev
, "backup interface %s is now down\n",
2921 if (slave
== curr_arp_slave
)
2925 if (!new_slave
&& before
)
2931 bond_set_slave_link_state(new_slave
, BOND_LINK_BACK
,
2932 BOND_SLAVE_NOTIFY_LATER
);
2933 bond_set_slave_active_flags(new_slave
, BOND_SLAVE_NOTIFY_LATER
);
2934 bond_arp_send_all(bond
, new_slave
);
2935 new_slave
->last_link_up
= jiffies
;
2936 rcu_assign_pointer(bond
->current_arp_slave
, new_slave
);
2939 bond_for_each_slave_rcu(bond
, slave
, iter
) {
2940 if (slave
->should_notify
|| slave
->should_notify_link
) {
2941 should_notify_rtnl
= BOND_SLAVE_NOTIFY_NOW
;
2945 return should_notify_rtnl
;
2948 static void bond_activebackup_arp_mon(struct bonding
*bond
)
2950 bool should_notify_peers
= false;
2951 bool should_notify_rtnl
= false;
2954 delta_in_ticks
= msecs_to_jiffies(bond
->params
.arp_interval
);
2956 if (!bond_has_slaves(bond
))
2961 should_notify_peers
= bond_should_notify_peers(bond
);
2963 if (bond_ab_arp_inspect(bond
)) {
2966 /* Race avoidance with bond_close flush of workqueue */
2967 if (!rtnl_trylock()) {
2969 should_notify_peers
= false;
2973 bond_ab_arp_commit(bond
);
2979 should_notify_rtnl
= bond_ab_arp_probe(bond
);
2983 if (bond
->params
.arp_interval
)
2984 queue_delayed_work(bond
->wq
, &bond
->arp_work
, delta_in_ticks
);
2986 if (should_notify_peers
|| should_notify_rtnl
) {
2987 if (!rtnl_trylock())
2990 if (should_notify_peers
)
2991 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
,
2993 if (should_notify_rtnl
) {
2994 bond_slave_state_notify(bond
);
2995 bond_slave_link_notify(bond
);
3002 static void bond_arp_monitor(struct work_struct
*work
)
3004 struct bonding
*bond
= container_of(work
, struct bonding
,
3007 if (BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
)
3008 bond_activebackup_arp_mon(bond
);
3010 bond_loadbalance_arp_mon(bond
);
3013 /*-------------------------- netdev event handling --------------------------*/
3015 /* Change device name */
3016 static int bond_event_changename(struct bonding
*bond
)
3018 bond_remove_proc_entry(bond
);
3019 bond_create_proc_entry(bond
);
3021 bond_debug_reregister(bond
);
3026 static int bond_master_netdev_event(unsigned long event
,
3027 struct net_device
*bond_dev
)
3029 struct bonding
*event_bond
= netdev_priv(bond_dev
);
3032 case NETDEV_CHANGENAME
:
3033 return bond_event_changename(event_bond
);
3034 case NETDEV_UNREGISTER
:
3035 bond_remove_proc_entry(event_bond
);
3037 case NETDEV_REGISTER
:
3038 bond_create_proc_entry(event_bond
);
3040 case NETDEV_NOTIFY_PEERS
:
3041 if (event_bond
->send_peer_notif
)
3042 event_bond
->send_peer_notif
--;
3051 static int bond_slave_netdev_event(unsigned long event
,
3052 struct net_device
*slave_dev
)
3054 struct slave
*slave
= bond_slave_get_rtnl(slave_dev
), *primary
;
3055 struct bonding
*bond
;
3056 struct net_device
*bond_dev
;
3058 /* A netdev event can be generated while enslaving a device
3059 * before netdev_rx_handler_register is called in which case
3060 * slave will be NULL
3064 bond_dev
= slave
->bond
->dev
;
3066 primary
= rtnl_dereference(bond
->primary_slave
);
3069 case NETDEV_UNREGISTER
:
3070 if (bond_dev
->type
!= ARPHRD_ETHER
)
3071 bond_release_and_destroy(bond_dev
, slave_dev
);
3073 __bond_release_one(bond_dev
, slave_dev
, false, true);
3077 bond_update_speed_duplex(slave
);
3078 if (BOND_MODE(bond
) == BOND_MODE_8023AD
)
3079 bond_3ad_adapter_speed_duplex_changed(slave
);
3082 /* Refresh slave-array if applicable!
3083 * If the setup does not use miimon or arpmon (mode-specific!),
3084 * then these events will not cause the slave-array to be
3085 * refreshed. This will cause xmit to use a slave that is not
3086 * usable. Avoid such situation by refeshing the array at these
3087 * events. If these (miimon/arpmon) parameters are configured
3088 * then array gets refreshed twice and that should be fine!
3090 if (bond_mode_uses_xmit_hash(bond
))
3091 bond_update_slave_arr(bond
, NULL
);
3093 case NETDEV_CHANGEMTU
:
3094 /* TODO: Should slaves be allowed to
3095 * independently alter their MTU? For
3096 * an active-backup bond, slaves need
3097 * not be the same type of device, so
3098 * MTUs may vary. For other modes,
3099 * slaves arguably should have the
3100 * same MTUs. To do this, we'd need to
3101 * take over the slave's change_mtu
3102 * function for the duration of their
3106 case NETDEV_CHANGENAME
:
3107 /* we don't care if we don't have primary set */
3108 if (!bond_uses_primary(bond
) ||
3109 !bond
->params
.primary
[0])
3112 if (slave
== primary
) {
3113 /* slave's name changed - he's no longer primary */
3114 RCU_INIT_POINTER(bond
->primary_slave
, NULL
);
3115 } else if (!strcmp(slave_dev
->name
, bond
->params
.primary
)) {
3116 /* we have a new primary slave */
3117 rcu_assign_pointer(bond
->primary_slave
, slave
);
3118 } else { /* we didn't change primary - exit */
3122 netdev_info(bond
->dev
, "Primary slave changed to %s, reselecting active slave\n",
3123 primary
? slave_dev
->name
: "none");
3126 bond_select_active_slave(bond
);
3127 unblock_netpoll_tx();
3129 case NETDEV_FEAT_CHANGE
:
3130 bond_compute_features(bond
);
3132 case NETDEV_RESEND_IGMP
:
3133 /* Propagate to master device */
3134 call_netdevice_notifiers(event
, slave
->bond
->dev
);
3143 /* bond_netdev_event: handle netdev notifier chain events.
3145 * This function receives events for the netdev chain. The caller (an
3146 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3147 * locks for us to safely manipulate the slave devices (RTNL lock,
3150 static int bond_netdev_event(struct notifier_block
*this,
3151 unsigned long event
, void *ptr
)
3153 struct net_device
*event_dev
= netdev_notifier_info_to_dev(ptr
);
3155 netdev_dbg(event_dev
, "event: %lx\n", event
);
3157 if (!(event_dev
->priv_flags
& IFF_BONDING
))
3160 if (event_dev
->flags
& IFF_MASTER
) {
3161 netdev_dbg(event_dev
, "IFF_MASTER\n");
3162 return bond_master_netdev_event(event
, event_dev
);
3165 if (event_dev
->flags
& IFF_SLAVE
) {
3166 netdev_dbg(event_dev
, "IFF_SLAVE\n");
3167 return bond_slave_netdev_event(event
, event_dev
);
3173 static struct notifier_block bond_netdev_notifier
= {
3174 .notifier_call
= bond_netdev_event
,
3177 /*---------------------------- Hashing Policies -----------------------------*/
3179 /* L2 hash helper */
3180 static inline u32
bond_eth_hash(struct sk_buff
*skb
)
3182 struct ethhdr
*ep
, hdr_tmp
;
3184 ep
= skb_header_pointer(skb
, 0, sizeof(hdr_tmp
), &hdr_tmp
);
3186 return ep
->h_dest
[5] ^ ep
->h_source
[5] ^ ep
->h_proto
;
3190 /* Extract the appropriate headers based on bond's xmit policy */
3191 static bool bond_flow_dissect(struct bonding
*bond
, struct sk_buff
*skb
,
3192 struct flow_keys
*fk
)
3194 const struct ipv6hdr
*iph6
;
3195 const struct iphdr
*iph
;
3196 int noff
, proto
= -1;
3198 if (bond
->params
.xmit_policy
> BOND_XMIT_POLICY_LAYER23
)
3199 return skb_flow_dissect_flow_keys(skb
, fk
, 0);
3201 fk
->ports
.ports
= 0;
3202 noff
= skb_network_offset(skb
);
3203 if (skb
->protocol
== htons(ETH_P_IP
)) {
3204 if (unlikely(!pskb_may_pull(skb
, noff
+ sizeof(*iph
))))
3207 iph_to_flow_copy_v4addrs(fk
, iph
);
3208 noff
+= iph
->ihl
<< 2;
3209 if (!ip_is_fragment(iph
))
3210 proto
= iph
->protocol
;
3211 } else if (skb
->protocol
== htons(ETH_P_IPV6
)) {
3212 if (unlikely(!pskb_may_pull(skb
, noff
+ sizeof(*iph6
))))
3214 iph6
= ipv6_hdr(skb
);
3215 iph_to_flow_copy_v6addrs(fk
, iph6
);
3216 noff
+= sizeof(*iph6
);
3217 proto
= iph6
->nexthdr
;
3221 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_LAYER34
&& proto
>= 0)
3222 fk
->ports
.ports
= skb_flow_get_ports(skb
, noff
, proto
);
3228 * bond_xmit_hash - generate a hash value based on the xmit policy
3229 * @bond: bonding device
3230 * @skb: buffer to use for headers
3232 * This function will extract the necessary headers from the skb buffer and use
3233 * them to generate a hash based on the xmit_policy set in the bonding device
3235 u32
bond_xmit_hash(struct bonding
*bond
, struct sk_buff
*skb
)
3237 struct flow_keys flow
;
3240 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_ENCAP34
&&
3244 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_LAYER2
||
3245 !bond_flow_dissect(bond
, skb
, &flow
))
3246 return bond_eth_hash(skb
);
3248 if (bond
->params
.xmit_policy
== BOND_XMIT_POLICY_LAYER23
||
3249 bond
->params
.xmit_policy
== BOND_XMIT_POLICY_ENCAP23
)
3250 hash
= bond_eth_hash(skb
);
3252 hash
= (__force u32
)flow
.ports
.ports
;
3253 hash
^= (__force u32
)flow_get_u32_dst(&flow
) ^
3254 (__force u32
)flow_get_u32_src(&flow
);
3255 hash
^= (hash
>> 16);
3256 hash
^= (hash
>> 8);
3261 /*-------------------------- Device entry points ----------------------------*/
3263 void bond_work_init_all(struct bonding
*bond
)
3265 INIT_DELAYED_WORK(&bond
->mcast_work
,
3266 bond_resend_igmp_join_requests_delayed
);
3267 INIT_DELAYED_WORK(&bond
->alb_work
, bond_alb_monitor
);
3268 INIT_DELAYED_WORK(&bond
->mii_work
, bond_mii_monitor
);
3269 INIT_DELAYED_WORK(&bond
->arp_work
, bond_arp_monitor
);
3270 INIT_DELAYED_WORK(&bond
->ad_work
, bond_3ad_state_machine_handler
);
3271 INIT_DELAYED_WORK(&bond
->slave_arr_work
, bond_slave_arr_handler
);
3274 static void bond_work_cancel_all(struct bonding
*bond
)
3276 cancel_delayed_work_sync(&bond
->mii_work
);
3277 cancel_delayed_work_sync(&bond
->arp_work
);
3278 cancel_delayed_work_sync(&bond
->alb_work
);
3279 cancel_delayed_work_sync(&bond
->ad_work
);
3280 cancel_delayed_work_sync(&bond
->mcast_work
);
3281 cancel_delayed_work_sync(&bond
->slave_arr_work
);
3284 static int bond_open(struct net_device
*bond_dev
)
3286 struct bonding
*bond
= netdev_priv(bond_dev
);
3287 struct list_head
*iter
;
3288 struct slave
*slave
;
3290 /* reset slave->backup and slave->inactive */
3291 if (bond_has_slaves(bond
)) {
3292 bond_for_each_slave(bond
, slave
, iter
) {
3293 if (bond_uses_primary(bond
) &&
3294 slave
!= rcu_access_pointer(bond
->curr_active_slave
)) {
3295 bond_set_slave_inactive_flags(slave
,
3296 BOND_SLAVE_NOTIFY_NOW
);
3297 } else if (BOND_MODE(bond
) != BOND_MODE_8023AD
) {
3298 bond_set_slave_active_flags(slave
,
3299 BOND_SLAVE_NOTIFY_NOW
);
3304 if (bond_is_lb(bond
)) {
3305 /* bond_alb_initialize must be called before the timer
3308 if (bond_alb_initialize(bond
, (BOND_MODE(bond
) == BOND_MODE_ALB
)))
3310 if (bond
->params
.tlb_dynamic_lb
)
3311 queue_delayed_work(bond
->wq
, &bond
->alb_work
, 0);
3314 if (bond
->params
.miimon
) /* link check interval, in milliseconds. */
3315 queue_delayed_work(bond
->wq
, &bond
->mii_work
, 0);
3317 if (bond
->params
.arp_interval
) { /* arp interval, in milliseconds. */
3318 queue_delayed_work(bond
->wq
, &bond
->arp_work
, 0);
3319 bond
->recv_probe
= bond_arp_rcv
;
3322 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
3323 queue_delayed_work(bond
->wq
, &bond
->ad_work
, 0);
3324 /* register to receive LACPDUs */
3325 bond
->recv_probe
= bond_3ad_lacpdu_recv
;
3326 bond_3ad_initiate_agg_selection(bond
, 1);
3329 if (bond_mode_uses_xmit_hash(bond
))
3330 bond_update_slave_arr(bond
, NULL
);
3335 static int bond_close(struct net_device
*bond_dev
)
3337 struct bonding
*bond
= netdev_priv(bond_dev
);
3339 bond_work_cancel_all(bond
);
3340 bond
->send_peer_notif
= 0;
3341 if (bond_is_lb(bond
))
3342 bond_alb_deinitialize(bond
);
3343 bond
->recv_probe
= NULL
;
3348 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3349 * that some drivers can provide 32bit values only.
3351 static void bond_fold_stats(struct rtnl_link_stats64
*_res
,
3352 const struct rtnl_link_stats64
*_new
,
3353 const struct rtnl_link_stats64
*_old
)
3355 const u64
*new = (const u64
*)_new
;
3356 const u64
*old
= (const u64
*)_old
;
3357 u64
*res
= (u64
*)_res
;
3360 for (i
= 0; i
< sizeof(*_res
) / sizeof(u64
); i
++) {
3363 s64 delta
= nv
- ov
;
3365 /* detects if this particular field is 32bit only */
3366 if (((nv
| ov
) >> 32) == 0)
3367 delta
= (s64
)(s32
)((u32
)nv
- (u32
)ov
);
3369 /* filter anomalies, some drivers reset their stats
3370 * at down/up events.
3377 static void bond_get_stats(struct net_device
*bond_dev
,
3378 struct rtnl_link_stats64
*stats
)
3380 struct bonding
*bond
= netdev_priv(bond_dev
);
3381 struct rtnl_link_stats64 temp
;
3382 struct list_head
*iter
;
3383 struct slave
*slave
;
3385 spin_lock(&bond
->stats_lock
);
3386 memcpy(stats
, &bond
->bond_stats
, sizeof(*stats
));
3389 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3390 const struct rtnl_link_stats64
*new =
3391 dev_get_stats(slave
->dev
, &temp
);
3393 bond_fold_stats(stats
, new, &slave
->slave_stats
);
3395 /* save off the slave stats for the next run */
3396 memcpy(&slave
->slave_stats
, new, sizeof(*new));
3400 memcpy(&bond
->bond_stats
, stats
, sizeof(*stats
));
3401 spin_unlock(&bond
->stats_lock
);
3404 static int bond_do_ioctl(struct net_device
*bond_dev
, struct ifreq
*ifr
, int cmd
)
3406 struct bonding
*bond
= netdev_priv(bond_dev
);
3407 struct net_device
*slave_dev
= NULL
;
3408 struct ifbond k_binfo
;
3409 struct ifbond __user
*u_binfo
= NULL
;
3410 struct ifslave k_sinfo
;
3411 struct ifslave __user
*u_sinfo
= NULL
;
3412 struct mii_ioctl_data
*mii
= NULL
;
3413 struct bond_opt_value newval
;
3417 netdev_dbg(bond_dev
, "bond_ioctl: cmd=%d\n", cmd
);
3428 /* We do this again just in case we were called by SIOCGMIIREG
3429 * instead of SIOCGMIIPHY.
3435 if (mii
->reg_num
== 1) {
3437 if (netif_carrier_ok(bond
->dev
))
3438 mii
->val_out
= BMSR_LSTATUS
;
3442 case BOND_INFO_QUERY_OLD
:
3443 case SIOCBONDINFOQUERY
:
3444 u_binfo
= (struct ifbond __user
*)ifr
->ifr_data
;
3446 if (copy_from_user(&k_binfo
, u_binfo
, sizeof(ifbond
)))
3449 bond_info_query(bond_dev
, &k_binfo
);
3450 if (copy_to_user(u_binfo
, &k_binfo
, sizeof(ifbond
)))
3454 case BOND_SLAVE_INFO_QUERY_OLD
:
3455 case SIOCBONDSLAVEINFOQUERY
:
3456 u_sinfo
= (struct ifslave __user
*)ifr
->ifr_data
;
3458 if (copy_from_user(&k_sinfo
, u_sinfo
, sizeof(ifslave
)))
3461 res
= bond_slave_info_query(bond_dev
, &k_sinfo
);
3463 copy_to_user(u_sinfo
, &k_sinfo
, sizeof(ifslave
)))
3471 net
= dev_net(bond_dev
);
3473 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
3476 slave_dev
= __dev_get_by_name(net
, ifr
->ifr_slave
);
3478 netdev_dbg(bond_dev
, "slave_dev=%p:\n", slave_dev
);
3483 netdev_dbg(bond_dev
, "slave_dev->name=%s:\n", slave_dev
->name
);
3485 case BOND_ENSLAVE_OLD
:
3486 case SIOCBONDENSLAVE
:
3487 res
= bond_enslave(bond_dev
, slave_dev
);
3489 case BOND_RELEASE_OLD
:
3490 case SIOCBONDRELEASE
:
3491 res
= bond_release(bond_dev
, slave_dev
);
3493 case BOND_SETHWADDR_OLD
:
3494 case SIOCBONDSETHWADDR
:
3495 bond_set_dev_addr(bond_dev
, slave_dev
);
3498 case BOND_CHANGE_ACTIVE_OLD
:
3499 case SIOCBONDCHANGEACTIVE
:
3500 bond_opt_initstr(&newval
, slave_dev
->name
);
3501 res
= __bond_opt_set_notify(bond
, BOND_OPT_ACTIVE_SLAVE
,
3511 static void bond_change_rx_flags(struct net_device
*bond_dev
, int change
)
3513 struct bonding
*bond
= netdev_priv(bond_dev
);
3515 if (change
& IFF_PROMISC
)
3516 bond_set_promiscuity(bond
,
3517 bond_dev
->flags
& IFF_PROMISC
? 1 : -1);
3519 if (change
& IFF_ALLMULTI
)
3520 bond_set_allmulti(bond
,
3521 bond_dev
->flags
& IFF_ALLMULTI
? 1 : -1);
3524 static void bond_set_rx_mode(struct net_device
*bond_dev
)
3526 struct bonding
*bond
= netdev_priv(bond_dev
);
3527 struct list_head
*iter
;
3528 struct slave
*slave
;
3531 if (bond_uses_primary(bond
)) {
3532 slave
= rcu_dereference(bond
->curr_active_slave
);
3534 dev_uc_sync(slave
->dev
, bond_dev
);
3535 dev_mc_sync(slave
->dev
, bond_dev
);
3538 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3539 dev_uc_sync_multiple(slave
->dev
, bond_dev
);
3540 dev_mc_sync_multiple(slave
->dev
, bond_dev
);
3546 static int bond_neigh_init(struct neighbour
*n
)
3548 struct bonding
*bond
= netdev_priv(n
->dev
);
3549 const struct net_device_ops
*slave_ops
;
3550 struct neigh_parms parms
;
3551 struct slave
*slave
;
3554 slave
= bond_first_slave(bond
);
3557 slave_ops
= slave
->dev
->netdev_ops
;
3558 if (!slave_ops
->ndo_neigh_setup
)
3561 parms
.neigh_setup
= NULL
;
3562 parms
.neigh_cleanup
= NULL
;
3563 ret
= slave_ops
->ndo_neigh_setup(slave
->dev
, &parms
);
3567 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3568 * after the last slave has been detached. Assumes that all slaves
3569 * utilize the same neigh_cleanup (true at this writing as only user
3572 n
->parms
->neigh_cleanup
= parms
.neigh_cleanup
;
3574 if (!parms
.neigh_setup
)
3577 return parms
.neigh_setup(n
);
3580 /* The bonding ndo_neigh_setup is called at init time beofre any
3581 * slave exists. So we must declare proxy setup function which will
3582 * be used at run time to resolve the actual slave neigh param setup.
3584 * It's also called by master devices (such as vlans) to setup their
3585 * underlying devices. In that case - do nothing, we're already set up from
3588 static int bond_neigh_setup(struct net_device
*dev
,
3589 struct neigh_parms
*parms
)
3591 /* modify only our neigh_parms */
3592 if (parms
->dev
== dev
)
3593 parms
->neigh_setup
= bond_neigh_init
;
3598 /* Change the MTU of all of a master's slaves to match the master */
3599 static int bond_change_mtu(struct net_device
*bond_dev
, int new_mtu
)
3601 struct bonding
*bond
= netdev_priv(bond_dev
);
3602 struct slave
*slave
, *rollback_slave
;
3603 struct list_head
*iter
;
3606 netdev_dbg(bond_dev
, "bond=%p, new_mtu=%d\n", bond
, new_mtu
);
3608 bond_for_each_slave(bond
, slave
, iter
) {
3609 netdev_dbg(bond_dev
, "s %p c_m %p\n",
3610 slave
, slave
->dev
->netdev_ops
->ndo_change_mtu
);
3612 res
= dev_set_mtu(slave
->dev
, new_mtu
);
3615 /* If we failed to set the slave's mtu to the new value
3616 * we must abort the operation even in ACTIVE_BACKUP
3617 * mode, because if we allow the backup slaves to have
3618 * different mtu values than the active slave we'll
3619 * need to change their mtu when doing a failover. That
3620 * means changing their mtu from timer context, which
3621 * is probably not a good idea.
3623 netdev_dbg(bond_dev
, "err %d %s\n", res
,
3629 bond_dev
->mtu
= new_mtu
;
3634 /* unwind from head to the slave that failed */
3635 bond_for_each_slave(bond
, rollback_slave
, iter
) {
3638 if (rollback_slave
== slave
)
3641 tmp_res
= dev_set_mtu(rollback_slave
->dev
, bond_dev
->mtu
);
3643 netdev_dbg(bond_dev
, "unwind err %d dev %s\n",
3644 tmp_res
, rollback_slave
->dev
->name
);
3651 /* Change HW address
3653 * Note that many devices must be down to change the HW address, and
3654 * downing the master releases all slaves. We can make bonds full of
3655 * bonding devices to test this, however.
3657 static int bond_set_mac_address(struct net_device
*bond_dev
, void *addr
)
3659 struct bonding
*bond
= netdev_priv(bond_dev
);
3660 struct slave
*slave
, *rollback_slave
;
3661 struct sockaddr_storage
*ss
= addr
, tmp_ss
;
3662 struct list_head
*iter
;
3665 if (BOND_MODE(bond
) == BOND_MODE_ALB
)
3666 return bond_alb_set_mac_address(bond_dev
, addr
);
3669 netdev_dbg(bond_dev
, "bond=%p\n", bond
);
3671 /* If fail_over_mac is enabled, do nothing and return success.
3672 * Returning an error causes ifenslave to fail.
3674 if (bond
->params
.fail_over_mac
&&
3675 BOND_MODE(bond
) == BOND_MODE_ACTIVEBACKUP
)
3678 if (!is_valid_ether_addr(ss
->__data
))
3679 return -EADDRNOTAVAIL
;
3681 bond_for_each_slave(bond
, slave
, iter
) {
3682 netdev_dbg(bond_dev
, "slave %p %s\n", slave
, slave
->dev
->name
);
3683 res
= dev_set_mac_address(slave
->dev
, addr
);
3685 /* TODO: consider downing the slave
3687 * User should expect communications
3688 * breakage anyway until ARP finish
3691 netdev_dbg(bond_dev
, "err %d %s\n", res
, slave
->dev
->name
);
3697 memcpy(bond_dev
->dev_addr
, ss
->__data
, bond_dev
->addr_len
);
3701 memcpy(tmp_ss
.__data
, bond_dev
->dev_addr
, bond_dev
->addr_len
);
3702 tmp_ss
.ss_family
= bond_dev
->type
;
3704 /* unwind from head to the slave that failed */
3705 bond_for_each_slave(bond
, rollback_slave
, iter
) {
3708 if (rollback_slave
== slave
)
3711 tmp_res
= dev_set_mac_address(rollback_slave
->dev
,
3712 (struct sockaddr
*)&tmp_ss
);
3714 netdev_dbg(bond_dev
, "unwind err %d dev %s\n",
3715 tmp_res
, rollback_slave
->dev
->name
);
3723 * bond_xmit_slave_id - transmit skb through slave with slave_id
3724 * @bond: bonding device that is transmitting
3725 * @skb: buffer to transmit
3726 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3728 * This function tries to transmit through slave with slave_id but in case
3729 * it fails, it tries to find the first available slave for transmission.
3730 * The skb is consumed in all cases, thus the function is void.
3732 static void bond_xmit_slave_id(struct bonding
*bond
, struct sk_buff
*skb
, int slave_id
)
3734 struct list_head
*iter
;
3735 struct slave
*slave
;
3738 /* Here we start from the slave with slave_id */
3739 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3741 if (bond_slave_can_tx(slave
)) {
3742 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3748 /* Here we start from the first slave up to slave_id */
3750 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3753 if (bond_slave_can_tx(slave
)) {
3754 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3758 /* no slave that can tx has been found */
3759 bond_tx_drop(bond
->dev
, skb
);
3763 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3764 * @bond: bonding device to use
3766 * Based on the value of the bonding device's packets_per_slave parameter
3767 * this function generates a slave id, which is usually used as the next
3768 * slave to transmit through.
3770 static u32
bond_rr_gen_slave_id(struct bonding
*bond
)
3773 struct reciprocal_value reciprocal_packets_per_slave
;
3774 int packets_per_slave
= bond
->params
.packets_per_slave
;
3776 switch (packets_per_slave
) {
3778 slave_id
= prandom_u32();
3781 slave_id
= bond
->rr_tx_counter
;
3784 reciprocal_packets_per_slave
=
3785 bond
->params
.reciprocal_packets_per_slave
;
3786 slave_id
= reciprocal_divide(bond
->rr_tx_counter
,
3787 reciprocal_packets_per_slave
);
3790 bond
->rr_tx_counter
++;
3795 static int bond_xmit_roundrobin(struct sk_buff
*skb
, struct net_device
*bond_dev
)
3797 struct bonding
*bond
= netdev_priv(bond_dev
);
3798 struct iphdr
*iph
= ip_hdr(skb
);
3799 struct slave
*slave
;
3802 /* Start with the curr_active_slave that joined the bond as the
3803 * default for sending IGMP traffic. For failover purposes one
3804 * needs to maintain some consistency for the interface that will
3805 * send the join/membership reports. The curr_active_slave found
3806 * will send all of this type of traffic.
3808 if (iph
->protocol
== IPPROTO_IGMP
&& skb
->protocol
== htons(ETH_P_IP
)) {
3809 slave
= rcu_dereference(bond
->curr_active_slave
);
3811 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3813 bond_xmit_slave_id(bond
, skb
, 0);
3815 int slave_cnt
= ACCESS_ONCE(bond
->slave_cnt
);
3817 if (likely(slave_cnt
)) {
3818 slave_id
= bond_rr_gen_slave_id(bond
);
3819 bond_xmit_slave_id(bond
, skb
, slave_id
% slave_cnt
);
3821 bond_tx_drop(bond_dev
, skb
);
3825 return NETDEV_TX_OK
;
3828 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3829 * the bond has a usable interface.
3831 static int bond_xmit_activebackup(struct sk_buff
*skb
, struct net_device
*bond_dev
)
3833 struct bonding
*bond
= netdev_priv(bond_dev
);
3834 struct slave
*slave
;
3836 slave
= rcu_dereference(bond
->curr_active_slave
);
3838 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3840 bond_tx_drop(bond_dev
, skb
);
3842 return NETDEV_TX_OK
;
3845 /* Use this to update slave_array when (a) it's not appropriate to update
3846 * slave_array right away (note that update_slave_array() may sleep)
3847 * and / or (b) RTNL is not held.
3849 void bond_slave_arr_work_rearm(struct bonding
*bond
, unsigned long delay
)
3851 queue_delayed_work(bond
->wq
, &bond
->slave_arr_work
, delay
);
3854 /* Slave array work handler. Holds only RTNL */
3855 static void bond_slave_arr_handler(struct work_struct
*work
)
3857 struct bonding
*bond
= container_of(work
, struct bonding
,
3858 slave_arr_work
.work
);
3861 if (!rtnl_trylock())
3864 ret
= bond_update_slave_arr(bond
, NULL
);
3867 pr_warn_ratelimited("Failed to update slave array from WT\n");
3873 bond_slave_arr_work_rearm(bond
, 1);
3876 /* Build the usable slaves array in control path for modes that use xmit-hash
3877 * to determine the slave interface -
3878 * (a) BOND_MODE_8023AD
3880 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3882 * The caller is expected to hold RTNL only and NO other lock!
3884 int bond_update_slave_arr(struct bonding
*bond
, struct slave
*skipslave
)
3886 struct slave
*slave
;
3887 struct list_head
*iter
;
3888 struct bond_up_slave
*new_arr
, *old_arr
;
3892 #ifdef CONFIG_LOCKDEP
3893 WARN_ON(lockdep_is_held(&bond
->mode_lock
));
3896 new_arr
= kzalloc(offsetof(struct bond_up_slave
, arr
[bond
->slave_cnt
]),
3900 pr_err("Failed to build slave-array.\n");
3903 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
3904 struct ad_info ad_info
;
3906 if (bond_3ad_get_active_agg_info(bond
, &ad_info
)) {
3907 pr_debug("bond_3ad_get_active_agg_info failed\n");
3908 kfree_rcu(new_arr
, rcu
);
3909 /* No active aggragator means it's not safe to use
3910 * the previous array.
3912 old_arr
= rtnl_dereference(bond
->slave_arr
);
3914 RCU_INIT_POINTER(bond
->slave_arr
, NULL
);
3915 kfree_rcu(old_arr
, rcu
);
3919 agg_id
= ad_info
.aggregator_id
;
3921 bond_for_each_slave(bond
, slave
, iter
) {
3922 if (BOND_MODE(bond
) == BOND_MODE_8023AD
) {
3923 struct aggregator
*agg
;
3925 agg
= SLAVE_AD_INFO(slave
)->port
.aggregator
;
3926 if (!agg
|| agg
->aggregator_identifier
!= agg_id
)
3929 if (!bond_slave_can_tx(slave
))
3931 if (skipslave
== slave
)
3933 new_arr
->arr
[new_arr
->count
++] = slave
;
3936 old_arr
= rtnl_dereference(bond
->slave_arr
);
3937 rcu_assign_pointer(bond
->slave_arr
, new_arr
);
3939 kfree_rcu(old_arr
, rcu
);
3941 if (ret
!= 0 && skipslave
) {
3944 /* Rare situation where caller has asked to skip a specific
3945 * slave but allocation failed (most likely!). BTW this is
3946 * only possible when the call is initiated from
3947 * __bond_release_one(). In this situation; overwrite the
3948 * skipslave entry in the array with the last entry from the
3949 * array to avoid a situation where the xmit path may choose
3950 * this to-be-skipped slave to send a packet out.
3952 old_arr
= rtnl_dereference(bond
->slave_arr
);
3953 for (idx
= 0; idx
< old_arr
->count
; idx
++) {
3954 if (skipslave
== old_arr
->arr
[idx
]) {
3956 old_arr
->arr
[old_arr
->count
-1];
3965 /* Use this Xmit function for 3AD as well as XOR modes. The current
3966 * usable slave array is formed in the control path. The xmit function
3967 * just calculates hash and sends the packet out.
3969 static int bond_3ad_xor_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
3971 struct bonding
*bond
= netdev_priv(dev
);
3972 struct slave
*slave
;
3973 struct bond_up_slave
*slaves
;
3976 slaves
= rcu_dereference(bond
->slave_arr
);
3977 count
= slaves
? ACCESS_ONCE(slaves
->count
) : 0;
3978 if (likely(count
)) {
3979 slave
= slaves
->arr
[bond_xmit_hash(bond
, skb
) % count
];
3980 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
3982 bond_tx_drop(dev
, skb
);
3985 return NETDEV_TX_OK
;
3988 /* in broadcast mode, we send everything to all usable interfaces. */
3989 static int bond_xmit_broadcast(struct sk_buff
*skb
, struct net_device
*bond_dev
)
3991 struct bonding
*bond
= netdev_priv(bond_dev
);
3992 struct slave
*slave
= NULL
;
3993 struct list_head
*iter
;
3995 bond_for_each_slave_rcu(bond
, slave
, iter
) {
3996 if (bond_is_last_slave(bond
, slave
))
3998 if (bond_slave_is_up(slave
) && slave
->link
== BOND_LINK_UP
) {
3999 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
4002 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4003 bond_dev
->name
, __func__
);
4006 bond_dev_queue_xmit(bond
, skb2
, slave
->dev
);
4009 if (slave
&& bond_slave_is_up(slave
) && slave
->link
== BOND_LINK_UP
)
4010 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
4012 bond_tx_drop(bond_dev
, skb
);
4014 return NETDEV_TX_OK
;
4017 /*------------------------- Device initialization ---------------------------*/
4019 /* Lookup the slave that corresponds to a qid */
4020 static inline int bond_slave_override(struct bonding
*bond
,
4021 struct sk_buff
*skb
)
4023 struct slave
*slave
= NULL
;
4024 struct list_head
*iter
;
4026 if (!skb
->queue_mapping
)
4029 /* Find out if any slaves have the same mapping as this skb. */
4030 bond_for_each_slave_rcu(bond
, slave
, iter
) {
4031 if (slave
->queue_id
== skb
->queue_mapping
) {
4032 if (bond_slave_is_up(slave
) &&
4033 slave
->link
== BOND_LINK_UP
) {
4034 bond_dev_queue_xmit(bond
, skb
, slave
->dev
);
4037 /* If the slave isn't UP, use default transmit policy. */
4046 static u16
bond_select_queue(struct net_device
*dev
, struct sk_buff
*skb
,
4047 void *accel_priv
, select_queue_fallback_t fallback
)
4049 /* This helper function exists to help dev_pick_tx get the correct
4050 * destination queue. Using a helper function skips a call to
4051 * skb_tx_hash and will put the skbs in the queue we expect on their
4052 * way down to the bonding driver.
4054 u16 txq
= skb_rx_queue_recorded(skb
) ? skb_get_rx_queue(skb
) : 0;
4056 /* Save the original txq to restore before passing to the driver */
4057 qdisc_skb_cb(skb
)->slave_dev_queue_mapping
= skb
->queue_mapping
;
4059 if (unlikely(txq
>= dev
->real_num_tx_queues
)) {
4061 txq
-= dev
->real_num_tx_queues
;
4062 } while (txq
>= dev
->real_num_tx_queues
);
4067 static netdev_tx_t
__bond_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
4069 struct bonding
*bond
= netdev_priv(dev
);
4071 if (bond_should_override_tx_queue(bond
) &&
4072 !bond_slave_override(bond
, skb
))
4073 return NETDEV_TX_OK
;
4075 switch (BOND_MODE(bond
)) {
4076 case BOND_MODE_ROUNDROBIN
:
4077 return bond_xmit_roundrobin(skb
, dev
);
4078 case BOND_MODE_ACTIVEBACKUP
:
4079 return bond_xmit_activebackup(skb
, dev
);
4080 case BOND_MODE_8023AD
:
4082 return bond_3ad_xor_xmit(skb
, dev
);
4083 case BOND_MODE_BROADCAST
:
4084 return bond_xmit_broadcast(skb
, dev
);
4086 return bond_alb_xmit(skb
, dev
);
4088 return bond_tlb_xmit(skb
, dev
);
4090 /* Should never happen, mode already checked */
4091 netdev_err(dev
, "Unknown bonding mode %d\n", BOND_MODE(bond
));
4093 bond_tx_drop(dev
, skb
);
4094 return NETDEV_TX_OK
;
4098 static netdev_tx_t
bond_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
4100 struct bonding
*bond
= netdev_priv(dev
);
4101 netdev_tx_t ret
= NETDEV_TX_OK
;
4103 /* If we risk deadlock from transmitting this in the
4104 * netpoll path, tell netpoll to queue the frame for later tx
4106 if (unlikely(is_netpoll_tx_blocked(dev
)))
4107 return NETDEV_TX_BUSY
;
4110 if (bond_has_slaves(bond
))
4111 ret
= __bond_start_xmit(skb
, dev
);
4113 bond_tx_drop(dev
, skb
);
4119 static int bond_ethtool_get_link_ksettings(struct net_device
*bond_dev
,
4120 struct ethtool_link_ksettings
*cmd
)
4122 struct bonding
*bond
= netdev_priv(bond_dev
);
4123 unsigned long speed
= 0;
4124 struct list_head
*iter
;
4125 struct slave
*slave
;
4127 cmd
->base
.duplex
= DUPLEX_UNKNOWN
;
4128 cmd
->base
.port
= PORT_OTHER
;
4130 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4131 * do not need to check mode. Though link speed might not represent
4132 * the true receive or transmit bandwidth (not all modes are symmetric)
4133 * this is an accurate maximum.
4135 bond_for_each_slave(bond
, slave
, iter
) {
4136 if (bond_slave_can_tx(slave
)) {
4137 if (slave
->speed
!= SPEED_UNKNOWN
)
4138 speed
+= slave
->speed
;
4139 if (cmd
->base
.duplex
== DUPLEX_UNKNOWN
&&
4140 slave
->duplex
!= DUPLEX_UNKNOWN
)
4141 cmd
->base
.duplex
= slave
->duplex
;
4144 cmd
->base
.speed
= speed
? : SPEED_UNKNOWN
;
4149 static void bond_ethtool_get_drvinfo(struct net_device
*bond_dev
,
4150 struct ethtool_drvinfo
*drvinfo
)
4152 strlcpy(drvinfo
->driver
, DRV_NAME
, sizeof(drvinfo
->driver
));
4153 strlcpy(drvinfo
->version
, DRV_VERSION
, sizeof(drvinfo
->version
));
4154 snprintf(drvinfo
->fw_version
, sizeof(drvinfo
->fw_version
), "%d",
4158 static const struct ethtool_ops bond_ethtool_ops
= {
4159 .get_drvinfo
= bond_ethtool_get_drvinfo
,
4160 .get_link
= ethtool_op_get_link
,
4161 .get_link_ksettings
= bond_ethtool_get_link_ksettings
,
4164 static const struct net_device_ops bond_netdev_ops
= {
4165 .ndo_init
= bond_init
,
4166 .ndo_uninit
= bond_uninit
,
4167 .ndo_open
= bond_open
,
4168 .ndo_stop
= bond_close
,
4169 .ndo_start_xmit
= bond_start_xmit
,
4170 .ndo_select_queue
= bond_select_queue
,
4171 .ndo_get_stats64
= bond_get_stats
,
4172 .ndo_do_ioctl
= bond_do_ioctl
,
4173 .ndo_change_rx_flags
= bond_change_rx_flags
,
4174 .ndo_set_rx_mode
= bond_set_rx_mode
,
4175 .ndo_change_mtu
= bond_change_mtu
,
4176 .ndo_set_mac_address
= bond_set_mac_address
,
4177 .ndo_neigh_setup
= bond_neigh_setup
,
4178 .ndo_vlan_rx_add_vid
= bond_vlan_rx_add_vid
,
4179 .ndo_vlan_rx_kill_vid
= bond_vlan_rx_kill_vid
,
4180 #ifdef CONFIG_NET_POLL_CONTROLLER
4181 .ndo_netpoll_setup
= bond_netpoll_setup
,
4182 .ndo_netpoll_cleanup
= bond_netpoll_cleanup
,
4183 .ndo_poll_controller
= bond_poll_controller
,
4185 .ndo_add_slave
= bond_enslave
,
4186 .ndo_del_slave
= bond_release
,
4187 .ndo_fix_features
= bond_fix_features
,
4188 .ndo_features_check
= passthru_features_check
,
4191 static const struct device_type bond_type
= {
4195 static void bond_destructor(struct net_device
*bond_dev
)
4197 struct bonding
*bond
= netdev_priv(bond_dev
);
4199 destroy_workqueue(bond
->wq
);
4202 void bond_setup(struct net_device
*bond_dev
)
4204 struct bonding
*bond
= netdev_priv(bond_dev
);
4206 spin_lock_init(&bond
->mode_lock
);
4207 spin_lock_init(&bond
->stats_lock
);
4208 bond
->params
= bonding_defaults
;
4210 /* Initialize pointers */
4211 bond
->dev
= bond_dev
;
4213 /* Initialize the device entry points */
4214 ether_setup(bond_dev
);
4215 bond_dev
->max_mtu
= ETH_MAX_MTU
;
4216 bond_dev
->netdev_ops
= &bond_netdev_ops
;
4217 bond_dev
->ethtool_ops
= &bond_ethtool_ops
;
4219 bond_dev
->needs_free_netdev
= true;
4220 bond_dev
->priv_destructor
= bond_destructor
;
4222 SET_NETDEV_DEVTYPE(bond_dev
, &bond_type
);
4224 /* Initialize the device options */
4225 bond_dev
->flags
|= IFF_MASTER
;
4226 bond_dev
->priv_flags
|= IFF_BONDING
| IFF_UNICAST_FLT
| IFF_NO_QUEUE
;
4227 bond_dev
->priv_flags
&= ~(IFF_XMIT_DST_RELEASE
| IFF_TX_SKB_SHARING
);
4229 /* don't acquire bond device's netif_tx_lock when transmitting */
4230 bond_dev
->features
|= NETIF_F_LLTX
;
4232 /* By default, we declare the bond to be fully
4233 * VLAN hardware accelerated capable. Special
4234 * care is taken in the various xmit functions
4235 * when there are slaves that are not hw accel
4239 /* Don't allow bond devices to change network namespaces. */
4240 bond_dev
->features
|= NETIF_F_NETNS_LOCAL
;
4242 bond_dev
->hw_features
= BOND_VLAN_FEATURES
|
4243 NETIF_F_HW_VLAN_CTAG_TX
|
4244 NETIF_F_HW_VLAN_CTAG_RX
|
4245 NETIF_F_HW_VLAN_CTAG_FILTER
;
4247 bond_dev
->hw_features
|= NETIF_F_GSO_ENCAP_ALL
;
4248 bond_dev
->features
|= bond_dev
->hw_features
;
4251 /* Destroy a bonding device.
4252 * Must be under rtnl_lock when this function is called.
4254 static void bond_uninit(struct net_device
*bond_dev
)
4256 struct bonding
*bond
= netdev_priv(bond_dev
);
4257 struct list_head
*iter
;
4258 struct slave
*slave
;
4259 struct bond_up_slave
*arr
;
4261 bond_netpoll_cleanup(bond_dev
);
4263 /* Release the bonded slaves */
4264 bond_for_each_slave(bond
, slave
, iter
)
4265 __bond_release_one(bond_dev
, slave
->dev
, true, true);
4266 netdev_info(bond_dev
, "Released all slaves\n");
4268 arr
= rtnl_dereference(bond
->slave_arr
);
4270 RCU_INIT_POINTER(bond
->slave_arr
, NULL
);
4271 kfree_rcu(arr
, rcu
);
4274 list_del(&bond
->bond_list
);
4276 bond_debug_unregister(bond
);
4279 /*------------------------- Module initialization ---------------------------*/
4281 static int bond_check_params(struct bond_params
*params
)
4283 int arp_validate_value
, fail_over_mac_value
, primary_reselect_value
, i
;
4284 struct bond_opt_value newval
;
4285 const struct bond_opt_value
*valptr
;
4286 int arp_all_targets_value
= 0;
4287 u16 ad_actor_sys_prio
= 0;
4288 u16 ad_user_port_key
= 0;
4289 __be32 arp_target
[BOND_MAX_ARP_TARGETS
] = { 0 };
4291 int bond_mode
= BOND_MODE_ROUNDROBIN
;
4292 int xmit_hashtype
= BOND_XMIT_POLICY_LAYER2
;
4296 /* Convert string parameters. */
4298 bond_opt_initstr(&newval
, mode
);
4299 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_MODE
), &newval
);
4301 pr_err("Error: Invalid bonding mode \"%s\"\n", mode
);
4304 bond_mode
= valptr
->value
;
4307 if (xmit_hash_policy
) {
4308 if ((bond_mode
!= BOND_MODE_XOR
) &&
4309 (bond_mode
!= BOND_MODE_8023AD
) &&
4310 (bond_mode
!= BOND_MODE_TLB
)) {
4311 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4312 bond_mode_name(bond_mode
));
4314 bond_opt_initstr(&newval
, xmit_hash_policy
);
4315 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH
),
4318 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4322 xmit_hashtype
= valptr
->value
;
4327 if (bond_mode
!= BOND_MODE_8023AD
) {
4328 pr_info("lacp_rate param is irrelevant in mode %s\n",
4329 bond_mode_name(bond_mode
));
4331 bond_opt_initstr(&newval
, lacp_rate
);
4332 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE
),
4335 pr_err("Error: Invalid lacp rate \"%s\"\n",
4339 lacp_fast
= valptr
->value
;
4344 bond_opt_initstr(&newval
, ad_select
);
4345 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT
),
4348 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select
);
4351 params
->ad_select
= valptr
->value
;
4352 if (bond_mode
!= BOND_MODE_8023AD
)
4353 pr_warn("ad_select param only affects 802.3ad mode\n");
4355 params
->ad_select
= BOND_AD_STABLE
;
4358 if (max_bonds
< 0) {
4359 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4360 max_bonds
, 0, INT_MAX
, BOND_DEFAULT_MAX_BONDS
);
4361 max_bonds
= BOND_DEFAULT_MAX_BONDS
;
4365 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4371 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4376 if (downdelay
< 0) {
4377 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4378 downdelay
, INT_MAX
);
4382 if ((use_carrier
!= 0) && (use_carrier
!= 1)) {
4383 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4388 if (num_peer_notif
< 0 || num_peer_notif
> 255) {
4389 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4394 /* reset values for 802.3ad/TLB/ALB */
4395 if (!bond_mode_uses_arp(bond_mode
)) {
4397 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");
4398 pr_warn("Forcing miimon to 100msec\n");
4399 miimon
= BOND_DEFAULT_MIIMON
;
4403 if (tx_queues
< 1 || tx_queues
> 255) {
4404 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4405 tx_queues
, BOND_DEFAULT_TX_QUEUES
);
4406 tx_queues
= BOND_DEFAULT_TX_QUEUES
;
4409 if ((all_slaves_active
!= 0) && (all_slaves_active
!= 1)) {
4410 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4412 all_slaves_active
= 0;
4415 if (resend_igmp
< 0 || resend_igmp
> 255) {
4416 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4417 resend_igmp
, BOND_DEFAULT_RESEND_IGMP
);
4418 resend_igmp
= BOND_DEFAULT_RESEND_IGMP
;
4421 bond_opt_initval(&newval
, packets_per_slave
);
4422 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE
), &newval
)) {
4423 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4424 packets_per_slave
, USHRT_MAX
);
4425 packets_per_slave
= 1;
4428 if (bond_mode
== BOND_MODE_ALB
) {
4429 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",
4434 if (updelay
|| downdelay
) {
4435 /* just warn the user the up/down delay will have
4436 * no effect since miimon is zero...
4438 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",
4439 updelay
, downdelay
);
4442 /* don't allow arp monitoring */
4444 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4445 miimon
, arp_interval
);
4449 if ((updelay
% miimon
) != 0) {
4450 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4451 updelay
, miimon
, (updelay
/ miimon
) * miimon
);
4456 if ((downdelay
% miimon
) != 0) {
4457 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4459 (downdelay
/ miimon
) * miimon
);
4462 downdelay
/= miimon
;
4465 if (arp_interval
< 0) {
4466 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4467 arp_interval
, INT_MAX
);
4471 for (arp_ip_count
= 0, i
= 0;
4472 (arp_ip_count
< BOND_MAX_ARP_TARGETS
) && arp_ip_target
[i
]; i
++) {
4475 /* not a complete check, but good enough to catch mistakes */
4476 if (!in4_pton(arp_ip_target
[i
], -1, (u8
*)&ip
, -1, NULL
) ||
4477 !bond_is_ip_target_ok(ip
)) {
4478 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4482 if (bond_get_targets_ip(arp_target
, ip
) == -1)
4483 arp_target
[arp_ip_count
++] = ip
;
4485 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4490 if (arp_interval
&& !arp_ip_count
) {
4491 /* don't allow arping if no arp_ip_target given... */
4492 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4498 if (!arp_interval
) {
4499 pr_err("arp_validate requires arp_interval\n");
4503 bond_opt_initstr(&newval
, arp_validate
);
4504 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE
),
4507 pr_err("Error: invalid arp_validate \"%s\"\n",
4511 arp_validate_value
= valptr
->value
;
4513 arp_validate_value
= 0;
4516 if (arp_all_targets
) {
4517 bond_opt_initstr(&newval
, arp_all_targets
);
4518 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS
),
4521 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4523 arp_all_targets_value
= 0;
4525 arp_all_targets_value
= valptr
->value
;
4530 pr_info("MII link monitoring set to %d ms\n", miimon
);
4531 } else if (arp_interval
) {
4532 valptr
= bond_opt_get_val(BOND_OPT_ARP_VALIDATE
,
4533 arp_validate_value
);
4534 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4535 arp_interval
, valptr
->string
, arp_ip_count
);
4537 for (i
= 0; i
< arp_ip_count
; i
++)
4538 pr_cont(" %s", arp_ip_target
[i
]);
4542 } else if (max_bonds
) {
4543 /* miimon and arp_interval not set, we need one so things
4544 * work as expected, see bonding.txt for details
4546 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");
4549 if (primary
&& !bond_mode_uses_primary(bond_mode
)) {
4550 /* currently, using a primary only makes sense
4551 * in active backup, TLB or ALB modes
4553 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4554 primary
, bond_mode_name(bond_mode
));
4558 if (primary
&& primary_reselect
) {
4559 bond_opt_initstr(&newval
, primary_reselect
);
4560 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT
),
4563 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4567 primary_reselect_value
= valptr
->value
;
4569 primary_reselect_value
= BOND_PRI_RESELECT_ALWAYS
;
4572 if (fail_over_mac
) {
4573 bond_opt_initstr(&newval
, fail_over_mac
);
4574 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC
),
4577 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4581 fail_over_mac_value
= valptr
->value
;
4582 if (bond_mode
!= BOND_MODE_ACTIVEBACKUP
)
4583 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4585 fail_over_mac_value
= BOND_FOM_NONE
;
4588 bond_opt_initstr(&newval
, "default");
4589 valptr
= bond_opt_parse(
4590 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO
),
4593 pr_err("Error: No ad_actor_sys_prio default value");
4596 ad_actor_sys_prio
= valptr
->value
;
4598 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY
),
4601 pr_err("Error: No ad_user_port_key default value");
4604 ad_user_port_key
= valptr
->value
;
4606 bond_opt_initstr(&newval
, "default");
4607 valptr
= bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB
), &newval
);
4609 pr_err("Error: No tlb_dynamic_lb default value");
4612 tlb_dynamic_lb
= valptr
->value
;
4614 if (lp_interval
== 0) {
4615 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4616 INT_MAX
, BOND_ALB_DEFAULT_LP_INTERVAL
);
4617 lp_interval
= BOND_ALB_DEFAULT_LP_INTERVAL
;
4620 /* fill params struct with the proper values */
4621 params
->mode
= bond_mode
;
4622 params
->xmit_policy
= xmit_hashtype
;
4623 params
->miimon
= miimon
;
4624 params
->num_peer_notif
= num_peer_notif
;
4625 params
->arp_interval
= arp_interval
;
4626 params
->arp_validate
= arp_validate_value
;
4627 params
->arp_all_targets
= arp_all_targets_value
;
4628 params
->updelay
= updelay
;
4629 params
->downdelay
= downdelay
;
4630 params
->use_carrier
= use_carrier
;
4631 params
->lacp_fast
= lacp_fast
;
4632 params
->primary
[0] = 0;
4633 params
->primary_reselect
= primary_reselect_value
;
4634 params
->fail_over_mac
= fail_over_mac_value
;
4635 params
->tx_queues
= tx_queues
;
4636 params
->all_slaves_active
= all_slaves_active
;
4637 params
->resend_igmp
= resend_igmp
;
4638 params
->min_links
= min_links
;
4639 params
->lp_interval
= lp_interval
;
4640 params
->packets_per_slave
= packets_per_slave
;
4641 params
->tlb_dynamic_lb
= tlb_dynamic_lb
;
4642 params
->ad_actor_sys_prio
= ad_actor_sys_prio
;
4643 eth_zero_addr(params
->ad_actor_system
);
4644 params
->ad_user_port_key
= ad_user_port_key
;
4645 if (packets_per_slave
> 0) {
4646 params
->reciprocal_packets_per_slave
=
4647 reciprocal_value(packets_per_slave
);
4649 /* reciprocal_packets_per_slave is unused if
4650 * packets_per_slave is 0 or 1, just initialize it
4652 params
->reciprocal_packets_per_slave
=
4653 (struct reciprocal_value
) { 0 };
4657 strncpy(params
->primary
, primary
, IFNAMSIZ
);
4658 params
->primary
[IFNAMSIZ
- 1] = 0;
4661 memcpy(params
->arp_targets
, arp_target
, sizeof(arp_target
));
4666 /* Called from registration process */
4667 static int bond_init(struct net_device
*bond_dev
)
4669 struct bonding
*bond
= netdev_priv(bond_dev
);
4670 struct bond_net
*bn
= net_generic(dev_net(bond_dev
), bond_net_id
);
4672 netdev_dbg(bond_dev
, "Begin bond_init\n");
4674 bond
->wq
= alloc_ordered_workqueue(bond_dev
->name
, WQ_MEM_RECLAIM
);
4678 netdev_lockdep_set_classes(bond_dev
);
4680 list_add_tail(&bond
->bond_list
, &bn
->dev_list
);
4682 bond_prepare_sysfs_group(bond
);
4684 bond_debug_register(bond
);
4686 /* Ensure valid dev_addr */
4687 if (is_zero_ether_addr(bond_dev
->dev_addr
) &&
4688 bond_dev
->addr_assign_type
== NET_ADDR_PERM
)
4689 eth_hw_addr_random(bond_dev
);
4694 unsigned int bond_get_num_tx_queues(void)
4699 /* Create a new bond based on the specified name and bonding parameters.
4700 * If name is NULL, obtain a suitable "bond%d" name for us.
4701 * Caller must NOT hold rtnl_lock; we need to release it here before we
4702 * set up our sysfs entries.
4704 int bond_create(struct net
*net
, const char *name
)
4706 struct net_device
*bond_dev
;
4707 struct bonding
*bond
;
4708 struct alb_bond_info
*bond_info
;
4713 bond_dev
= alloc_netdev_mq(sizeof(struct bonding
),
4714 name
? name
: "bond%d", NET_NAME_UNKNOWN
,
4715 bond_setup
, tx_queues
);
4717 pr_err("%s: eek! can't alloc netdev!\n", name
);
4723 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4724 * It is set to 0 by default which is wrong.
4726 bond
= netdev_priv(bond_dev
);
4727 bond_info
= &(BOND_ALB_INFO(bond
));
4728 bond_info
->rx_hashtbl_used_head
= RLB_NULL_INDEX
;
4730 dev_net_set(bond_dev
, net
);
4731 bond_dev
->rtnl_link_ops
= &bond_link_ops
;
4733 res
= register_netdevice(bond_dev
);
4735 netif_carrier_off(bond_dev
);
4737 bond_work_init_all(bond
);
4741 free_netdev(bond_dev
);
4745 static int __net_init
bond_net_init(struct net
*net
)
4747 struct bond_net
*bn
= net_generic(net
, bond_net_id
);
4750 INIT_LIST_HEAD(&bn
->dev_list
);
4752 bond_create_proc_dir(bn
);
4753 bond_create_sysfs(bn
);
4758 static void __net_exit
bond_net_exit(struct net
*net
)
4760 struct bond_net
*bn
= net_generic(net
, bond_net_id
);
4761 struct bonding
*bond
, *tmp_bond
;
4764 bond_destroy_sysfs(bn
);
4766 /* Kill off any bonds created after unregistering bond rtnl ops */
4768 list_for_each_entry_safe(bond
, tmp_bond
, &bn
->dev_list
, bond_list
)
4769 unregister_netdevice_queue(bond
->dev
, &list
);
4770 unregister_netdevice_many(&list
);
4773 bond_destroy_proc_dir(bn
);
4776 static struct pernet_operations bond_net_ops
= {
4777 .init
= bond_net_init
,
4778 .exit
= bond_net_exit
,
4780 .size
= sizeof(struct bond_net
),
4783 static int __init
bonding_init(void)
4788 pr_info("%s", bond_version
);
4790 res
= bond_check_params(&bonding_defaults
);
4794 res
= register_pernet_subsys(&bond_net_ops
);
4798 res
= bond_netlink_init();
4802 bond_create_debugfs();
4804 for (i
= 0; i
< max_bonds
; i
++) {
4805 res
= bond_create(&init_net
, NULL
);
4810 register_netdevice_notifier(&bond_netdev_notifier
);
4814 bond_destroy_debugfs();
4815 bond_netlink_fini();
4817 unregister_pernet_subsys(&bond_net_ops
);
4822 static void __exit
bonding_exit(void)
4824 unregister_netdevice_notifier(&bond_netdev_notifier
);
4826 bond_destroy_debugfs();
4828 bond_netlink_fini();
4829 unregister_pernet_subsys(&bond_net_ops
);
4831 #ifdef CONFIG_NET_POLL_CONTROLLER
4832 /* Make sure we don't have an imbalance on our netpoll blocking */
4833 WARN_ON(atomic_read(&netpoll_block_tx
));
4837 module_init(bonding_init
);
4838 module_exit(bonding_exit
);
4839 MODULE_LICENSE("GPL");
4840 MODULE_VERSION(DRV_VERSION
);
4841 MODULE_DESCRIPTION(DRV_DESCRIPTION
", v" DRV_VERSION
);
4842 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");