-
Notifications
You must be signed in to change notification settings - Fork 54.8k
/
Copy pathbond_main.c
4744 lines (4009 loc) · 131 KB
/
bond_main.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* originally based on the dummy device.
*
* Copyright 1999, Thomas Davis, tadavis@lbl.gov.
* Licensed under the GPL. Based on dummy.c, and eql.c devices.
*
* bonding.c: an Ethernet Bonding driver
*
* This is useful to talk to a Cisco EtherChannel compatible equipment:
* Cisco 5500
* Sun Trunking (Solaris)
* Alteon AceDirector Trunks
* Linux Bonding
* and probably many L2 switches ...
*
* How it works:
* ifconfig bond0 ipaddress netmask up
* will setup a network device, with an ip address. No mac address
* will be assigned at this time. The hw mac address will come from
* the first slave bonded to the channel. All slaves will then use
* this hw mac address.
*
* ifconfig bond0 down
* will release all slaves, marking them as down.
*
* ifenslave bond0 eth0
* will attach eth0 to bond0 as a slave. eth0 hw mac address will either
* a: be used as initial mac address
* b: if a hw mac address already is there, eth0's hw mac address
* will then be set from bond0.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <net/ip.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <asm/dma.h>
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
#include <linux/jiffies.h>
#include <linux/preempt.h>
#include <net/route.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/pkt_sched.h>
#include <linux/rculist.h>
#include <net/flow_dissector.h>
#include <net/switchdev.h>
#include <net/bonding.h>
#include <net/bond_3ad.h>
#include <net/bond_alb.h>
#include "bonding_priv.h"
/*---------------------------- Module parameters ----------------------------*/
/* monitor all links that often (in milliseconds). <=0 disables monitoring */
static int max_bonds = BOND_DEFAULT_MAX_BONDS;
static int tx_queues = BOND_DEFAULT_TX_QUEUES;
static int num_peer_notif = 1;
static int miimon;
static int updelay;
static int downdelay;
static int use_carrier = 1;
static char *mode;
static char *primary;
static char *primary_reselect;
static char *lacp_rate;
static int min_links;
static char *ad_select;
static char *xmit_hash_policy;
static int arp_interval;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *arp_all_targets;
static char *fail_over_mac;
static int all_slaves_active;
static struct bond_params bonding_defaults;
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
static int packets_per_slave = 1;
static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
module_param(tx_queues, int, 0);
MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
module_param_named(num_grat_arp, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
"failover event (alias of num_unsol_na)");
module_param_named(num_unsol_na, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
"failover event (alias of num_grat_arp)");
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
module_param(downdelay, int, 0);
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
"in milliseconds");
module_param(use_carrier, int, 0);
MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
"0 for off, 1 for on (default)");
module_param(mode, charp, 0);
MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
"1 for active-backup, 2 for balance-xor, "
"3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
"6 for balance-alb");
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(primary_reselect, charp, 0);
MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
"once it comes up; "
"0 for always (default), "
"1 for only if speed of primary is "
"better, "
"2 for only on active slave "
"failure");
module_param(lacp_rate, charp, 0);
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
"0 for slow, 1 for fast");
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
"0 for stable (default), 1 for bandwidth, "
"2 for count");
module_param(min_links, int, 0);
MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
module_param(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
"0 for layer 2 (default), 1 for layer 3+4, "
"2 for layer 2+3, 3 for encap layer 2+3, "
"4 for encap layer 3+4");
module_param(arp_interval, int, 0);
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
"0 for none (default), 1 for active, "
"2 for backup, 3 for all");
module_param(arp_all_targets, charp, 0);
MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
"the same MAC; 0 for none (default), "
"1 for active, 2 for follow");
module_param(all_slaves_active, int, 0);
MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
"by setting active flag for all slaves; "
"0 for never (default), 1 for always.");
module_param(resend_igmp, int, 0);
MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
"link failure");
module_param(packets_per_slave, int, 0);
MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
"mode; 0 for a random slave, 1 packet per "
"slave (default), >1 packets per slave.");
module_param(lp_interval, uint, 0);
MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
"the bonding driver sends learning packets to "
"each slaves peer switch. The default is 1.");
/*----------------------------- Global variables ----------------------------*/
#ifdef CONFIG_NET_POLL_CONTROLLER
atomic_t netpoll_block_tx = ATOMIC_INIT(0);
#endif
int bond_net_id __read_mostly;
static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
static int bond_mode = BOND_MODE_ROUNDROBIN;
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;
/*-------------------------- Forward declarations ---------------------------*/
static int bond_init(struct net_device *bond_dev);
static void bond_uninit(struct net_device *bond_dev);
static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
struct rtnl_link_stats64 *stats);
static void bond_slave_arr_handler(struct work_struct *work);
/*---------------------------- General routines -----------------------------*/
const char *bond_mode_name(int mode)
{
static const char *names[] = {
[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
[BOND_MODE_XOR] = "load balancing (xor)",
[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
[BOND_MODE_TLB] = "transmit load balancing",
[BOND_MODE_ALB] = "adaptive load balancing",
};
if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
return "unknown";
return names[mode];
}
/*---------------------------------- VLAN -----------------------------------*/
/**
* bond_dev_queue_xmit - Prepare skb for xmit.
*
* @bond: bond device that got this skb for tx.
* @skb: hw accel VLAN tagged skb to transmit
* @slave_dev: slave that is supposed to xmit this skbuff
*/
void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
struct net_device *slave_dev)
{
skb->dev = slave_dev;
BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
if (unlikely(netpoll_tx_running(bond->dev)))
bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
else
dev_queue_xmit(skb);
}
/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
* We don't protect the slave list iteration with a lock because:
* a. This operation is performed in IOCTL context,
* b. The operation is protected by the RTNL semaphore in the 8021q code,
* c. Holding a lock with BH disabled while directly calling a base driver
* entry point is generally a BAD idea.
*
* The design of synchronization/protection for this operation in the 8021q
* module is good for one or more VLAN devices over a single physical device
* and cannot be extended for a teaming solution like bonding, so there is a
* potential race condition here where a net device from the vlan group might
* be referenced (either by a base driver or the 8021q code) while it is being
* removed from the system. However, it turns out we're not making matters
* worse, and if it works for regular VLAN usage it will work here too.
*/
/**
* bond_vlan_rx_add_vid - Propagates adding an id to slaves
* @bond_dev: bonding net device that got called
* @vid: vlan id being added
*/
static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
__be16 proto, u16 vid)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave, *rollback_slave;
struct list_head *iter;
int res;
bond_for_each_slave(bond, slave, iter) {
res = vlan_vid_add(slave->dev, proto, vid);
if (res)
goto unwind;
}
return 0;
unwind:
/* unwind to the slave that failed */
bond_for_each_slave(bond, rollback_slave, iter) {
if (rollback_slave == slave)
break;
vlan_vid_del(rollback_slave->dev, proto, vid);
}
return res;
}
/**
* bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
* @bond_dev: bonding net device that got called
* @vid: vlan id being removed
*/
static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
__be16 proto, u16 vid)
{
struct bonding *bond = netdev_priv(bond_dev);
struct list_head *iter;
struct slave *slave;
bond_for_each_slave(bond, slave, iter)
vlan_vid_del(slave->dev, proto, vid);
if (bond_is_lb(bond))
bond_alb_clear_vlan(bond, vid);
return 0;
}
/*------------------------------- Link status -------------------------------*/
/* Set the carrier state for the master according to the state of its
* slaves. If any slaves are up, the master is up. In 802.3ad mode,
* do special 802.3ad magic.
*
* Returns zero if carrier state does not change, nonzero if it does.
*/
int bond_set_carrier(struct bonding *bond)
{
struct list_head *iter;
struct slave *slave;
if (!bond_has_slaves(bond))
goto down;
if (BOND_MODE(bond) == BOND_MODE_8023AD)
return bond_3ad_set_carrier(bond);
bond_for_each_slave(bond, slave, iter) {
if (slave->link == BOND_LINK_UP) {
if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
return 1;
}
return 0;
}
}
down:
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
return 1;
}
return 0;
}
/* Get link speed and duplex from the slave's base driver
* using ethtool. If for some reason the call fails or the
* values are invalid, set speed and duplex to -1,
* and return.
*/
static void bond_update_speed_duplex(struct slave *slave)
{
struct net_device *slave_dev = slave->dev;
struct ethtool_cmd ecmd;
u32 slave_speed;
int res;
slave->speed = SPEED_UNKNOWN;
slave->duplex = DUPLEX_UNKNOWN;
res = __ethtool_get_settings(slave_dev, &ecmd);
if (res < 0)
return;
slave_speed = ethtool_cmd_speed(&ecmd);
if (slave_speed == 0 || slave_speed == ((__u32) -1))
return;
switch (ecmd.duplex) {
case DUPLEX_FULL:
case DUPLEX_HALF:
break;
default:
return;
}
slave->speed = slave_speed;
slave->duplex = ecmd.duplex;
return;
}
const char *bond_slave_link_status(s8 link)
{
switch (link) {
case BOND_LINK_UP:
return "up";
case BOND_LINK_FAIL:
return "going down";
case BOND_LINK_DOWN:
return "down";
case BOND_LINK_BACK:
return "going back";
default:
return "unknown";
}
}
/* if <dev> supports MII link status reporting, check its link status.
*
* We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
* depending upon the setting of the use_carrier parameter.
*
* Return either BMSR_LSTATUS, meaning that the link is up (or we
* can't tell and just pretend it is), or 0, meaning that the link is
* down.
*
* If reporting is non-zero, instead of faking link up, return -1 if
* both ETHTOOL and MII ioctls fail (meaning the device does not
* support them). If use_carrier is set, return whatever it says.
* It'd be nice if there was a good way to tell if a driver supports
* netif_carrier, but there really isn't.
*/
static int bond_check_dev_link(struct bonding *bond,
struct net_device *slave_dev, int reporting)
{
const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
int (*ioctl)(struct net_device *, struct ifreq *, int);
struct ifreq ifr;
struct mii_ioctl_data *mii;
if (!reporting && !netif_running(slave_dev))
return 0;
if (bond->params.use_carrier)
return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
/* Try to get link status using Ethtool first. */
if (slave_dev->ethtool_ops->get_link)
return slave_dev->ethtool_ops->get_link(slave_dev) ?
BMSR_LSTATUS : 0;
/* Ethtool can't be used, fallback to MII ioctls. */
ioctl = slave_ops->ndo_do_ioctl;
if (ioctl) {
/* TODO: set pointer to correct ioctl on a per team member
* bases to make this more efficient. that is, once
* we determine the correct ioctl, we will always
* call it and not the others for that team
* member.
*/
/* We cannot assume that SIOCGMIIPHY will also read a
* register; not all network drivers (e.g., e100)
* support that.
*/
/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
mii = if_mii(&ifr);
if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
mii->reg_num = MII_BMSR;
if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
return mii->val_out & BMSR_LSTATUS;
}
}
/* If reporting, report that either there's no dev->do_ioctl,
* or both SIOCGMIIREG and get_link failed (meaning that we
* cannot report link status). If not reporting, pretend
* we're ok.
*/
return reporting ? -1 : BMSR_LSTATUS;
}
/*----------------------------- Multicast list ------------------------------*/
/* Push the promiscuity flag down to appropriate slaves */
static int bond_set_promiscuity(struct bonding *bond, int inc)
{
struct list_head *iter;
int err = 0;
if (bond_uses_primary(bond)) {
struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
if (curr_active)
err = dev_set_promiscuity(curr_active->dev, inc);
} else {
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
err = dev_set_promiscuity(slave->dev, inc);
if (err)
return err;
}
}
return err;
}
/* Push the allmulti flag down to all slaves */
static int bond_set_allmulti(struct bonding *bond, int inc)
{
struct list_head *iter;
int err = 0;
if (bond_uses_primary(bond)) {
struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
if (curr_active)
err = dev_set_allmulti(curr_active->dev, inc);
} else {
struct slave *slave;
bond_for_each_slave(bond, slave, iter) {
err = dev_set_allmulti(slave->dev, inc);
if (err)
return err;
}
}
return err;
}
/* Retrieve the list of registered multicast addresses for the bonding
* device and retransmit an IGMP JOIN request to the current active
* slave.
*/
static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
{
struct bonding *bond = container_of(work, struct bonding,
mcast_work.work);
if (!rtnl_trylock()) {
queue_delayed_work(bond->wq, &bond->mcast_work, 1);
return;
}
call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
if (bond->igmp_retrans > 1) {
bond->igmp_retrans--;
queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
}
rtnl_unlock();
}
/* Flush bond's hardware addresses from slave */
static void bond_hw_addr_flush(struct net_device *bond_dev,
struct net_device *slave_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
dev_uc_unsync(slave_dev, bond_dev);
dev_mc_unsync(slave_dev, bond_dev);
if (BOND_MODE(bond) == BOND_MODE_8023AD) {
/* del lacpdu mc addr from mc list */
u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
dev_mc_del(slave_dev, lacpdu_multicast);
}
}
/*--------------------------- Active slave change ---------------------------*/
/* Update the hardware address list and promisc/allmulti for the new and
* old active slaves (if any). Modes that are not using primary keep all
* slaves up date at all times; only the modes that use primary need to call
* this function to swap these settings during a failover.
*/
static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
struct slave *old_active)
{
if (old_active) {
if (bond->dev->flags & IFF_PROMISC)
dev_set_promiscuity(old_active->dev, -1);
if (bond->dev->flags & IFF_ALLMULTI)
dev_set_allmulti(old_active->dev, -1);
bond_hw_addr_flush(bond->dev, old_active->dev);
}
if (new_active) {
/* FIXME: Signal errors upstream. */
if (bond->dev->flags & IFF_PROMISC)
dev_set_promiscuity(new_active->dev, 1);
if (bond->dev->flags & IFF_ALLMULTI)
dev_set_allmulti(new_active->dev, 1);
netif_addr_lock_bh(bond->dev);
dev_uc_sync(new_active->dev, bond->dev);
dev_mc_sync(new_active->dev, bond->dev);
netif_addr_unlock_bh(bond->dev);
}
}
/**
* bond_set_dev_addr - clone slave's address to bond
* @bond_dev: bond net device
* @slave_dev: slave net device
*
* Should be called with RTNL held.
*/
static void bond_set_dev_addr(struct net_device *bond_dev,
struct net_device *slave_dev)
{
netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
bond_dev, slave_dev, slave_dev->addr_len);
memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
bond_dev->addr_assign_type = NET_ADDR_STOLEN;
call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
}
static struct slave *bond_get_old_active(struct bonding *bond,
struct slave *new_active)
{
struct slave *slave;
struct list_head *iter;
bond_for_each_slave(bond, slave, iter) {
if (slave == new_active)
continue;
if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
return slave;
}
return NULL;
}
/* bond_do_fail_over_mac
*
* Perform special MAC address swapping for fail_over_mac settings
*
* Called with RTNL
*/
static void bond_do_fail_over_mac(struct bonding *bond,
struct slave *new_active,
struct slave *old_active)
{
u8 tmp_mac[ETH_ALEN];
struct sockaddr saddr;
int rv;
switch (bond->params.fail_over_mac) {
case BOND_FOM_ACTIVE:
if (new_active)
bond_set_dev_addr(bond->dev, new_active->dev);
break;
case BOND_FOM_FOLLOW:
/* if new_active && old_active, swap them
* if just old_active, do nothing (going to no active slave)
* if just new_active, set new_active to bond's MAC
*/
if (!new_active)
return;
if (!old_active)
old_active = bond_get_old_active(bond, new_active);
if (old_active) {
ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
ether_addr_copy(saddr.sa_data,
old_active->dev->dev_addr);
saddr.sa_family = new_active->dev->type;
} else {
ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
saddr.sa_family = bond->dev->type;
}
rv = dev_set_mac_address(new_active->dev, &saddr);
if (rv) {
netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
-rv, new_active->dev->name);
goto out;
}
if (!old_active)
goto out;
ether_addr_copy(saddr.sa_data, tmp_mac);
saddr.sa_family = old_active->dev->type;
rv = dev_set_mac_address(old_active->dev, &saddr);
if (rv)
netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
-rv, new_active->dev->name);
out:
break;
default:
netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
bond->params.fail_over_mac);
break;
}
}
static struct slave *bond_choose_primary_or_current(struct bonding *bond)
{
struct slave *prim = rtnl_dereference(bond->primary_slave);
struct slave *curr = rtnl_dereference(bond->curr_active_slave);
if (!prim || prim->link != BOND_LINK_UP) {
if (!curr || curr->link != BOND_LINK_UP)
return NULL;
return curr;
}
if (bond->force_primary) {
bond->force_primary = false;
return prim;
}
if (!curr || curr->link != BOND_LINK_UP)
return prim;
/* At this point, prim and curr are both up */
switch (bond->params.primary_reselect) {
case BOND_PRI_RESELECT_ALWAYS:
return prim;
case BOND_PRI_RESELECT_BETTER:
if (prim->speed < curr->speed)
return curr;
if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
return curr;
return prim;
case BOND_PRI_RESELECT_FAILURE:
return curr;
default:
netdev_err(bond->dev, "impossible primary_reselect %d\n",
bond->params.primary_reselect);
return curr;
}
}
/**
* bond_find_best_slave - select the best available slave to be the active one
* @bond: our bonding struct
*/
static struct slave *bond_find_best_slave(struct bonding *bond)
{
struct slave *slave, *bestslave = NULL;
struct list_head *iter;
int mintime = bond->params.updelay;
slave = bond_choose_primary_or_current(bond);
if (slave)
return slave;
bond_for_each_slave(bond, slave, iter) {
if (slave->link == BOND_LINK_UP)
return slave;
if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
slave->delay < mintime) {
mintime = slave->delay;
bestslave = slave;
}
}
return bestslave;
}
static bool bond_should_notify_peers(struct bonding *bond)
{
struct slave *slave;
rcu_read_lock();
slave = rcu_dereference(bond->curr_active_slave);
rcu_read_unlock();
netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
slave ? slave->dev->name : "NULL");
if (!slave || !bond->send_peer_notif ||
!netif_carrier_ok(bond->dev) ||
test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
return false;
return true;
}
/**
* change_active_interface - change the active slave into the specified one
* @bond: our bonding struct
* @new: the new slave to make the active one
*
* Set the new slave to the bond's settings and unset them on the old
* curr_active_slave.
* Setting include flags, mc-list, promiscuity, allmulti, etc.
*
* If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
* because it is apparently the best available slave we have, even though its
* updelay hasn't timed out yet.
*
* Caller must hold RTNL.
*/
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
{
struct slave *old_active;
ASSERT_RTNL();
old_active = rtnl_dereference(bond->curr_active_slave);
if (old_active == new_active)
return;
if (new_active) {
new_active->last_link_up = jiffies;
if (new_active->link == BOND_LINK_BACK) {
if (bond_uses_primary(bond)) {
netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
new_active->dev->name,
(bond->params.updelay - new_active->delay) * bond->params.miimon);
}
new_active->delay = 0;
bond_set_slave_link_state(new_active, BOND_LINK_UP);
if (BOND_MODE(bond) == BOND_MODE_8023AD)
bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
if (bond_is_lb(bond))
bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
} else {
if (bond_uses_primary(bond)) {
netdev_info(bond->dev, "making interface %s the new active one\n",
new_active->dev->name);
}
}
}
if (bond_uses_primary(bond))
bond_hw_addr_swap(bond, new_active, old_active);
if (bond_is_lb(bond)) {
bond_alb_handle_active_change(bond, new_active);
if (old_active)
bond_set_slave_inactive_flags(old_active,
BOND_SLAVE_NOTIFY_NOW);
if (new_active)
bond_set_slave_active_flags(new_active,
BOND_SLAVE_NOTIFY_NOW);
} else {
rcu_assign_pointer(bond->curr_active_slave, new_active);
}
if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
if (old_active)
bond_set_slave_inactive_flags(old_active,
BOND_SLAVE_NOTIFY_NOW);
if (new_active) {
bool should_notify_peers = false;
bond_set_slave_active_flags(new_active,
BOND_SLAVE_NOTIFY_NOW);
if (bond->params.fail_over_mac)
bond_do_fail_over_mac(bond, new_active,
old_active);
if (netif_running(bond->dev)) {
bond->send_peer_notif =
bond->params.num_peer_notif;
should_notify_peers =
bond_should_notify_peers(bond);
}
call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
if (should_notify_peers)
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
bond->dev);
}
}
/* resend IGMP joins since active slave has changed or
* all were sent on curr_active_slave.
* resend only if bond is brought up with the affected
* bonding modes and the retransmission is enabled
*/
if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
((bond_uses_primary(bond) && new_active) ||
BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
bond->igmp_retrans = bond->params.resend_igmp;
queue_delayed_work(bond->wq, &bond->mcast_work, 1);
}
}
/**
* bond_select_active_slave - select a new active slave, if needed
* @bond: our bonding struct
*
* This functions should be called when one of the following occurs:
* - The old curr_active_slave has been released or lost its link.
* - The primary_slave has got its link back.
* - A slave has got its link back and there's no old curr_active_slave.
*
* Caller must hold RTNL.
*/
void bond_select_active_slave(struct bonding *bond)
{
struct slave *best_slave;
int rv;
ASSERT_RTNL();
best_slave = bond_find_best_slave(bond);
if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
bond_change_active_slave(bond, best_slave);
rv = bond_set_carrier(bond);
if (!rv)
return;
if (netif_carrier_ok(bond->dev)) {
netdev_info(bond->dev, "first active interface up!\n");
} else {
netdev_info(bond->dev, "now running without any active interface!\n");
}
}
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static inline int slave_enable_netpoll(struct slave *slave)
{
struct netpoll *np;
int err = 0;
np = kzalloc(sizeof(*np), GFP_KERNEL);
err = -ENOMEM;
if (!np)
goto out;
err = __netpoll_setup(np, slave->dev);
if (err) {
kfree(np);
goto out;
}
slave->np = np;
out:
return err;
}
static inline void slave_disable_netpoll(struct slave *slave)
{
struct netpoll *np = slave->np;
if (!np)
return;
slave->np = NULL;
__netpoll_free_async(np);
}
static void bond_poll_controller(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave = NULL;
struct list_head *iter;
struct ad_info ad_info;
struct netpoll_info *ni;
const struct net_device_ops *ops;
if (BOND_MODE(bond) == BOND_MODE_8023AD)
if (bond_3ad_get_active_agg_info(bond, &ad_info))
return;
bond_for_each_slave_rcu(bond, slave, iter) {
ops = slave->dev->netdev_ops;
if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
continue;
if (BOND_MODE(bond) == BOND_MODE_8023AD) {
struct aggregator *agg =
SLAVE_AD_INFO(slave)->port.aggregator;
if (agg &&
agg->aggregator_identifier != ad_info.aggregator_id)
continue;
}
ni = rcu_dereference_bh(slave->dev->npinfo);
if (down_trylock(&ni->dev_lock))
continue;
ops->ndo_poll_controller(slave->dev);
up(&ni->dev_lock);