/
bond_alb.c
1828 lines (1528 loc) · 49 KB
/
bond_alb.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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
*/
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/pkt_sched.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_bonding.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <net/ipx.h>
#include <net/arp.h>
#include <net/ipv6.h>
#include <asm/byteorder.h>
#include <net/bonding.h>
#include <net/bond_alb.h>
static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
0x33, 0x33, 0x00, 0x00, 0x00, 0x01
};
static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
#pragma pack(1)
struct learning_pkt {
u8 mac_dst[ETH_ALEN];
u8 mac_src[ETH_ALEN];
__be16 type;
u8 padding[ETH_ZLEN - ETH_HLEN];
};
struct arp_pkt {
__be16 hw_addr_space;
__be16 prot_addr_space;
u8 hw_addr_len;
u8 prot_addr_len;
__be16 op_code;
u8 mac_src[ETH_ALEN]; /* sender hardware address */
__be32 ip_src; /* sender IP address */
u8 mac_dst[ETH_ALEN]; /* target hardware address */
__be32 ip_dst; /* target IP address */
};
#pragma pack()
/* Forward declaration */
static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
bool strict_match);
static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
static void rlb_src_unlink(struct bonding *bond, u32 index);
static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
u32 ip_dst_hash);
static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
{
int i;
u8 hash = 0;
for (i = 0; i < hash_size; i++)
hash ^= hash_start[i];
return hash;
}
/*********************** tlb specific functions ***************************/
static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
{
if (save_load) {
entry->load_history = 1 + entry->tx_bytes /
BOND_TLB_REBALANCE_INTERVAL;
entry->tx_bytes = 0;
}
entry->tx_slave = NULL;
entry->next = TLB_NULL_INDEX;
entry->prev = TLB_NULL_INDEX;
}
static inline void tlb_init_slave(struct slave *slave)
{
SLAVE_TLB_INFO(slave).load = 0;
SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
}
static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
int save_load)
{
struct tlb_client_info *tx_hash_table;
u32 index;
/* clear slave from tx_hashtbl */
tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
/* skip this if we've already freed the tx hash table */
if (tx_hash_table) {
index = SLAVE_TLB_INFO(slave).head;
while (index != TLB_NULL_INDEX) {
u32 next_index = tx_hash_table[index].next;
tlb_init_table_entry(&tx_hash_table[index], save_load);
index = next_index;
}
}
tlb_init_slave(slave);
}
static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
int save_load)
{
spin_lock_bh(&bond->mode_lock);
__tlb_clear_slave(bond, slave, save_load);
spin_unlock_bh(&bond->mode_lock);
}
/* Must be called before starting the monitor timer */
static int tlb_initialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
struct tlb_client_info *new_hashtbl;
int i;
new_hashtbl = kzalloc(size, GFP_KERNEL);
if (!new_hashtbl)
return -ENOMEM;
spin_lock_bh(&bond->mode_lock);
bond_info->tx_hashtbl = new_hashtbl;
for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
spin_unlock_bh(&bond->mode_lock);
return 0;
}
/* Must be called only after all slaves have been released */
static void tlb_deinitialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
spin_lock_bh(&bond->mode_lock);
kfree(bond_info->tx_hashtbl);
bond_info->tx_hashtbl = NULL;
spin_unlock_bh(&bond->mode_lock);
}
static long long compute_gap(struct slave *slave)
{
return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
(s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
}
static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
{
struct slave *slave, *least_loaded;
struct list_head *iter;
long long max_gap;
least_loaded = NULL;
max_gap = LLONG_MIN;
/* Find the slave with the largest gap */
bond_for_each_slave_rcu(bond, slave, iter) {
if (bond_slave_can_tx(slave)) {
long long gap = compute_gap(slave);
if (max_gap < gap) {
least_loaded = slave;
max_gap = gap;
}
}
}
return least_loaded;
}
static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
u32 skb_len)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct tlb_client_info *hash_table;
struct slave *assigned_slave;
hash_table = bond_info->tx_hashtbl;
assigned_slave = hash_table[hash_index].tx_slave;
if (!assigned_slave) {
assigned_slave = tlb_get_least_loaded_slave(bond);
if (assigned_slave) {
struct tlb_slave_info *slave_info =
&(SLAVE_TLB_INFO(assigned_slave));
u32 next_index = slave_info->head;
hash_table[hash_index].tx_slave = assigned_slave;
hash_table[hash_index].next = next_index;
hash_table[hash_index].prev = TLB_NULL_INDEX;
if (next_index != TLB_NULL_INDEX)
hash_table[next_index].prev = hash_index;
slave_info->head = hash_index;
slave_info->load +=
hash_table[hash_index].load_history;
}
}
if (assigned_slave)
hash_table[hash_index].tx_bytes += skb_len;
return assigned_slave;
}
static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
u32 skb_len)
{
struct slave *tx_slave;
/* We don't need to disable softirq here, becase
* tlb_choose_channel() is only called by bond_alb_xmit()
* which already has softirq disabled.
*/
spin_lock(&bond->mode_lock);
tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
spin_unlock(&bond->mode_lock);
return tx_slave;
}
/*********************** rlb specific functions ***************************/
/* when an ARP REPLY is received from a client update its info
* in the rx_hashtbl
*/
static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *client_info;
u32 hash_index;
spin_lock_bh(&bond->mode_lock);
hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
client_info = &(bond_info->rx_hashtbl[hash_index]);
if ((client_info->assigned) &&
(client_info->ip_src == arp->ip_dst) &&
(client_info->ip_dst == arp->ip_src) &&
(!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
/* update the clients MAC address */
ether_addr_copy(client_info->mac_dst, arp->mac_src);
client_info->ntt = 1;
bond_info->rx_ntt = 1;
}
spin_unlock_bh(&bond->mode_lock);
}
static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
struct arp_pkt *arp, _arp;
if (skb->protocol != cpu_to_be16(ETH_P_ARP))
goto out;
arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
if (!arp)
goto out;
/* We received an ARP from arp->ip_src.
* We might have used this IP address previously (on the bonding host
* itself or on a system that is bridged together with the bond).
* However, if arp->mac_src is different than what is stored in
* rx_hashtbl, some other host is now using the IP and we must prevent
* sending out client updates with this IP address and the old MAC
* address.
* Clean up all hash table entries that have this address as ip_src but
* have a different mac_src.
*/
rlb_purge_src_ip(bond, arp);
if (arp->op_code == htons(ARPOP_REPLY)) {
/* update rx hash table for this ARP */
rlb_update_entry_from_arp(bond, arp);
slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n");
}
out:
return RX_HANDLER_ANOTHER;
}
/* Caller must hold rcu_read_lock() */
static struct slave *__rlb_next_rx_slave(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct slave *before = NULL, *rx_slave = NULL, *slave;
struct list_head *iter;
bool found = false;
bond_for_each_slave_rcu(bond, slave, iter) {
if (!bond_slave_can_tx(slave))
continue;
if (!found) {
if (!before || before->speed < slave->speed)
before = slave;
} else {
if (!rx_slave || rx_slave->speed < slave->speed)
rx_slave = slave;
}
if (slave == bond_info->rx_slave)
found = true;
}
/* we didn't find anything after the current or we have something
* better before and up to the current slave
*/
if (!rx_slave || (before && rx_slave->speed < before->speed))
rx_slave = before;
if (rx_slave)
bond_info->rx_slave = rx_slave;
return rx_slave;
}
/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
static struct slave *rlb_next_rx_slave(struct bonding *bond)
{
struct slave *rx_slave;
ASSERT_RTNL();
rcu_read_lock();
rx_slave = __rlb_next_rx_slave(bond);
rcu_read_unlock();
return rx_slave;
}
/* teach the switch the mac of a disabled slave
* on the primary for fault tolerance
*
* Caller must hold RTNL
*/
static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
{
struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
if (!curr_active)
return;
if (!bond->alb_info.primary_is_promisc) {
if (!dev_set_promiscuity(curr_active->dev, 1))
bond->alb_info.primary_is_promisc = 1;
else
bond->alb_info.primary_is_promisc = 0;
}
bond->alb_info.rlb_promisc_timeout_counter = 0;
alb_send_learning_packets(curr_active, addr, true);
}
/* slave being removed should not be active at this point
*
* Caller must hold rtnl.
*/
static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *rx_hash_table;
u32 index, next_index;
/* clear slave from rx_hashtbl */
spin_lock_bh(&bond->mode_lock);
rx_hash_table = bond_info->rx_hashtbl;
index = bond_info->rx_hashtbl_used_head;
for (; index != RLB_NULL_INDEX; index = next_index) {
next_index = rx_hash_table[index].used_next;
if (rx_hash_table[index].slave == slave) {
struct slave *assigned_slave = rlb_next_rx_slave(bond);
if (assigned_slave) {
rx_hash_table[index].slave = assigned_slave;
if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) {
bond_info->rx_hashtbl[index].ntt = 1;
bond_info->rx_ntt = 1;
/* A slave has been removed from the
* table because it is either disabled
* or being released. We must retry the
* update to avoid clients from not
* being updated & disconnecting when
* there is stress
*/
bond_info->rlb_update_retry_counter =
RLB_UPDATE_RETRY;
}
} else { /* there is no active slave */
rx_hash_table[index].slave = NULL;
}
}
}
spin_unlock_bh(&bond->mode_lock);
if (slave != rtnl_dereference(bond->curr_active_slave))
rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
}
static void rlb_update_client(struct rlb_client_info *client_info)
{
int i;
if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
return;
for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
struct sk_buff *skb;
skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
client_info->ip_dst,
client_info->slave->dev,
client_info->ip_src,
client_info->mac_dst,
client_info->slave->dev->dev_addr,
client_info->mac_dst);
if (!skb) {
slave_err(client_info->slave->bond->dev,
client_info->slave->dev,
"failed to create an ARP packet\n");
continue;
}
skb->dev = client_info->slave->dev;
if (client_info->vlan_id) {
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
client_info->vlan_id);
}
arp_xmit(skb);
}
}
/* sends ARP REPLIES that update the clients that need updating */
static void rlb_update_rx_clients(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *client_info;
u32 hash_index;
spin_lock_bh(&bond->mode_lock);
hash_index = bond_info->rx_hashtbl_used_head;
for (; hash_index != RLB_NULL_INDEX;
hash_index = client_info->used_next) {
client_info = &(bond_info->rx_hashtbl[hash_index]);
if (client_info->ntt) {
rlb_update_client(client_info);
if (bond_info->rlb_update_retry_counter == 0)
client_info->ntt = 0;
}
}
/* do not update the entries again until this counter is zero so that
* not to confuse the clients.
*/
bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
spin_unlock_bh(&bond->mode_lock);
}
/* The slave was assigned a new mac address - update the clients */
static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *client_info;
int ntt = 0;
u32 hash_index;
spin_lock_bh(&bond->mode_lock);
hash_index = bond_info->rx_hashtbl_used_head;
for (; hash_index != RLB_NULL_INDEX;
hash_index = client_info->used_next) {
client_info = &(bond_info->rx_hashtbl[hash_index]);
if ((client_info->slave == slave) &&
is_valid_ether_addr(client_info->mac_dst)) {
client_info->ntt = 1;
ntt = 1;
}
}
/* update the team's flag only after the whole iteration */
if (ntt) {
bond_info->rx_ntt = 1;
/* fasten the change */
bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
}
spin_unlock_bh(&bond->mode_lock);
}
/* mark all clients using src_ip to be updated */
static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *client_info;
u32 hash_index;
spin_lock(&bond->mode_lock);
hash_index = bond_info->rx_hashtbl_used_head;
for (; hash_index != RLB_NULL_INDEX;
hash_index = client_info->used_next) {
client_info = &(bond_info->rx_hashtbl[hash_index]);
if (!client_info->slave) {
netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
continue;
}
/* update all clients using this src_ip, that are not assigned
* to the team's address (curr_active_slave) and have a known
* unicast mac address.
*/
if ((client_info->ip_src == src_ip) &&
!ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
bond->dev->dev_addr) &&
is_valid_ether_addr(client_info->mac_dst)) {
client_info->ntt = 1;
bond_info->rx_ntt = 1;
}
}
spin_unlock(&bond->mode_lock);
}
static struct slave *rlb_choose_channel(struct sk_buff *skb,
struct bonding *bond,
const struct arp_pkt *arp)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct slave *assigned_slave, *curr_active_slave;
struct rlb_client_info *client_info;
u32 hash_index = 0;
spin_lock(&bond->mode_lock);
curr_active_slave = rcu_dereference(bond->curr_active_slave);
hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
client_info = &(bond_info->rx_hashtbl[hash_index]);
if (client_info->assigned) {
if ((client_info->ip_src == arp->ip_src) &&
(client_info->ip_dst == arp->ip_dst)) {
/* the entry is already assigned to this client */
if (!is_broadcast_ether_addr(arp->mac_dst)) {
/* update mac address from arp */
ether_addr_copy(client_info->mac_dst, arp->mac_dst);
}
ether_addr_copy(client_info->mac_src, arp->mac_src);
assigned_slave = client_info->slave;
if (assigned_slave) {
spin_unlock(&bond->mode_lock);
return assigned_slave;
}
} else {
/* the entry is already assigned to some other client,
* move the old client to primary (curr_active_slave) so
* that the new client can be assigned to this entry.
*/
if (curr_active_slave &&
client_info->slave != curr_active_slave) {
client_info->slave = curr_active_slave;
rlb_update_client(client_info);
}
}
}
/* assign a new slave */
assigned_slave = __rlb_next_rx_slave(bond);
if (assigned_slave) {
if (!(client_info->assigned &&
client_info->ip_src == arp->ip_src)) {
/* ip_src is going to be updated,
* fix the src hash list
*/
u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
sizeof(arp->ip_src));
rlb_src_unlink(bond, hash_index);
rlb_src_link(bond, hash_src, hash_index);
}
client_info->ip_src = arp->ip_src;
client_info->ip_dst = arp->ip_dst;
/* arp->mac_dst is broadcast for arp reqeusts.
* will be updated with clients actual unicast mac address
* upon receiving an arp reply.
*/
ether_addr_copy(client_info->mac_dst, arp->mac_dst);
ether_addr_copy(client_info->mac_src, arp->mac_src);
client_info->slave = assigned_slave;
if (is_valid_ether_addr(client_info->mac_dst)) {
client_info->ntt = 1;
bond->alb_info.rx_ntt = 1;
} else {
client_info->ntt = 0;
}
if (vlan_get_tag(skb, &client_info->vlan_id))
client_info->vlan_id = 0;
if (!client_info->assigned) {
u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
bond_info->rx_hashtbl_used_head = hash_index;
client_info->used_next = prev_tbl_head;
if (prev_tbl_head != RLB_NULL_INDEX) {
bond_info->rx_hashtbl[prev_tbl_head].used_prev =
hash_index;
}
client_info->assigned = 1;
}
}
spin_unlock(&bond->mode_lock);
return assigned_slave;
}
/* chooses (and returns) transmit channel for arp reply
* does not choose channel for other arp types since they are
* sent on the curr_active_slave
*/
static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
{
struct slave *tx_slave = NULL;
struct arp_pkt *arp;
if (!pskb_network_may_pull(skb, sizeof(*arp)))
return NULL;
arp = (struct arp_pkt *)skb_network_header(skb);
/* Don't modify or load balance ARPs that do not originate locally
* (e.g.,arrive via a bridge).
*/
if (!bond_slave_has_mac_rx(bond, arp->mac_src))
return NULL;
if (arp->op_code == htons(ARPOP_REPLY)) {
/* the arp must be sent on the selected rx channel */
tx_slave = rlb_choose_channel(skb, bond, arp);
if (tx_slave)
bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
tx_slave->dev->addr_len);
netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n",
tx_slave ? tx_slave->dev->name : "NULL");
} else if (arp->op_code == htons(ARPOP_REQUEST)) {
/* Create an entry in the rx_hashtbl for this client as a
* place holder.
* When the arp reply is received the entry will be updated
* with the correct unicast address of the client.
*/
tx_slave = rlb_choose_channel(skb, bond, arp);
/* The ARP reply packets must be delayed so that
* they can cancel out the influence of the ARP request.
*/
bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
/* arp requests are broadcast and are sent on the primary
* the arp request will collapse all clients on the subnet to
* the primary slave. We must register these clients to be
* updated with their assigned mac.
*/
rlb_req_update_subnet_clients(bond, arp->ip_src);
netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n",
tx_slave ? tx_slave->dev->name : "NULL");
}
return tx_slave;
}
static void rlb_rebalance(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct slave *assigned_slave;
struct rlb_client_info *client_info;
int ntt;
u32 hash_index;
spin_lock_bh(&bond->mode_lock);
ntt = 0;
hash_index = bond_info->rx_hashtbl_used_head;
for (; hash_index != RLB_NULL_INDEX;
hash_index = client_info->used_next) {
client_info = &(bond_info->rx_hashtbl[hash_index]);
assigned_slave = __rlb_next_rx_slave(bond);
if (assigned_slave && (client_info->slave != assigned_slave)) {
client_info->slave = assigned_slave;
if (!is_zero_ether_addr(client_info->mac_dst)) {
client_info->ntt = 1;
ntt = 1;
}
}
}
/* update the team's flag only after the whole iteration */
if (ntt)
bond_info->rx_ntt = 1;
spin_unlock_bh(&bond->mode_lock);
}
/* Caller must hold mode_lock */
static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
{
entry->used_next = RLB_NULL_INDEX;
entry->used_prev = RLB_NULL_INDEX;
entry->assigned = 0;
entry->slave = NULL;
entry->vlan_id = 0;
}
static void rlb_init_table_entry_src(struct rlb_client_info *entry)
{
entry->src_first = RLB_NULL_INDEX;
entry->src_prev = RLB_NULL_INDEX;
entry->src_next = RLB_NULL_INDEX;
}
static void rlb_init_table_entry(struct rlb_client_info *entry)
{
memset(entry, 0, sizeof(struct rlb_client_info));
rlb_init_table_entry_dst(entry);
rlb_init_table_entry_src(entry);
}
static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u32 next_index = bond_info->rx_hashtbl[index].used_next;
u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
if (index == bond_info->rx_hashtbl_used_head)
bond_info->rx_hashtbl_used_head = next_index;
if (prev_index != RLB_NULL_INDEX)
bond_info->rx_hashtbl[prev_index].used_next = next_index;
if (next_index != RLB_NULL_INDEX)
bond_info->rx_hashtbl[next_index].used_prev = prev_index;
}
/* unlink a rlb hash table entry from the src list */
static void rlb_src_unlink(struct bonding *bond, u32 index)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u32 next_index = bond_info->rx_hashtbl[index].src_next;
u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
if (next_index != RLB_NULL_INDEX)
bond_info->rx_hashtbl[next_index].src_prev = prev_index;
if (prev_index == RLB_NULL_INDEX)
return;
/* is prev_index pointing to the head of this list? */
if (bond_info->rx_hashtbl[prev_index].src_first == index)
bond_info->rx_hashtbl[prev_index].src_first = next_index;
else
bond_info->rx_hashtbl[prev_index].src_next = next_index;
}
static void rlb_delete_table_entry(struct bonding *bond, u32 index)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
rlb_delete_table_entry_dst(bond, index);
rlb_init_table_entry_dst(entry);
rlb_src_unlink(bond, index);
}
/* add the rx_hashtbl[ip_dst_hash] entry to the list
* of entries with identical ip_src_hash
*/
static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u32 next;
bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
next = bond_info->rx_hashtbl[ip_src_hash].src_first;
bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
if (next != RLB_NULL_INDEX)
bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
}
/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
* not match arp->mac_src
*/
static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
u32 index;
spin_lock_bh(&bond->mode_lock);
index = bond_info->rx_hashtbl[ip_src_hash].src_first;
while (index != RLB_NULL_INDEX) {
struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
u32 next_index = entry->src_next;
if (entry->ip_src == arp->ip_src &&
!ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
rlb_delete_table_entry(bond, index);
index = next_index;
}
spin_unlock_bh(&bond->mode_lock);
}
static int rlb_initialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
struct rlb_client_info *new_hashtbl;
int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
int i;
new_hashtbl = kmalloc(size, GFP_KERNEL);
if (!new_hashtbl)
return -1;
spin_lock_bh(&bond->mode_lock);
bond_info->rx_hashtbl = new_hashtbl;
bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
rlb_init_table_entry(bond_info->rx_hashtbl + i);
spin_unlock_bh(&bond->mode_lock);
/* register to receive ARPs */
bond->recv_probe = rlb_arp_recv;
return 0;
}
static void rlb_deinitialize(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
spin_lock_bh(&bond->mode_lock);
kfree(bond_info->rx_hashtbl);
bond_info->rx_hashtbl = NULL;
bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
spin_unlock_bh(&bond->mode_lock);
}
static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
u32 curr_index;
spin_lock_bh(&bond->mode_lock);
curr_index = bond_info->rx_hashtbl_used_head;
while (curr_index != RLB_NULL_INDEX) {
struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
if (curr->vlan_id == vlan_id)
rlb_delete_table_entry(bond, curr_index);
curr_index = next_index;
}
spin_unlock_bh(&bond->mode_lock);
}
/*********************** tlb/rlb shared functions *********************/
static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
__be16 vlan_proto, u16 vid)
{
struct learning_pkt pkt;
struct sk_buff *skb;
int size = sizeof(struct learning_pkt);
memset(&pkt, 0, size);
ether_addr_copy(pkt.mac_dst, mac_addr);
ether_addr_copy(pkt.mac_src, mac_addr);
pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
skb = dev_alloc_skb(size);
if (!skb)
return;
skb_put_data(skb, &pkt, size);
skb_reset_mac_header(skb);
skb->network_header = skb->mac_header + ETH_HLEN;
skb->protocol = pkt.type;
skb->priority = TC_PRIO_CONTROL;
skb->dev = slave->dev;
slave_dbg(slave->bond->dev, slave->dev,
"Send learning packet: mac %pM vlan %d\n", mac_addr, vid);
if (vid)
__vlan_hwaccel_put_tag(skb, vlan_proto, vid);
dev_queue_xmit(skb);
}
struct alb_walk_data {
struct bonding *bond;
struct slave *slave;
u8 *mac_addr;
bool strict_match;
};
static int alb_upper_dev_walk(struct net_device *upper,
struct netdev_nested_priv *priv)
{
struct alb_walk_data *data = (struct alb_walk_data *)priv->data;
bool strict_match = data->strict_match;
struct bonding *bond = data->bond;
struct slave *slave = data->slave;
u8 *mac_addr = data->mac_addr;
struct bond_vlan_tag *tags;
if (is_vlan_dev(upper) &&
bond->dev->lower_level == upper->lower_level - 1) {
if (upper->addr_assign_type == NET_ADDR_STOLEN) {
alb_send_lp_vid(slave, mac_addr,
vlan_dev_vlan_proto(upper),
vlan_dev_vlan_id(upper));
} else {
alb_send_lp_vid(slave, upper->dev_addr,
vlan_dev_vlan_proto(upper),
vlan_dev_vlan_id(upper));
}
}
/* If this is a macvlan device, then only send updates
* when strict_match is turned off.
*/
if (netif_is_macvlan(upper) && !strict_match) {
tags = bond_verify_device_path(bond->dev, upper, 0);
if (IS_ERR_OR_NULL(tags))
BUG();
alb_send_lp_vid(slave, upper->dev_addr,
tags[0].vlan_proto, tags[0].vlan_id);
kfree(tags);
}
return 0;
}
static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
bool strict_match)
{
struct bonding *bond = bond_get_bond_by_slave(slave);
struct netdev_nested_priv priv;
struct alb_walk_data data = {
.strict_match = strict_match,
.mac_addr = mac_addr,
.slave = slave,
.bond = bond,
};
priv.data = (void *)&data;
/* send untagged */
alb_send_lp_vid(slave, mac_addr, 0, 0);
/* loop through all devices and see if we need to send a packet
* for that device.