forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 17
/
port.c
2075 lines (1694 loc) · 49.5 KB
/
port.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
/*
* Handling of a single switch port
*
* Copyright (c) 2017 Savoir-faire Linux Inc.
* Vivien Didelot <[email protected]>
*/
#include <linux/if_bridge.h>
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include "dsa.h"
#include "port.h"
#include "switch.h"
#include "tag_8021q.h"
#include "user.h"
/**
* dsa_port_notify - Notify the switching fabric of changes to a port
* @dp: port on which change occurred
* @e: event, must be of type DSA_NOTIFIER_*
* @v: event-specific value.
*
* Notify all switches in the DSA tree that this port's switch belongs to,
* including this switch itself, of an event. Allows the other switches to
* reconfigure themselves for cross-chip operations. Can also be used to
* reconfigure ports without net_devices (CPU ports, DSA links) whenever
* a user port's state changes.
*/
static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
{
return dsa_tree_notify(dp->ds->dst, e, v);
}
static void dsa_port_notify_bridge_fdb_flush(const struct dsa_port *dp, u16 vid)
{
struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
struct switchdev_notifier_fdb_info info = {
.vid = vid,
};
/* When the port becomes standalone it has already left the bridge.
* Don't notify the bridge in that case.
*/
if (!brport_dev)
return;
call_switchdev_notifiers(SWITCHDEV_FDB_FLUSH_TO_BRIDGE,
brport_dev, &info.info, NULL);
}
static void dsa_port_fast_age(const struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
if (!ds->ops->port_fast_age)
return;
ds->ops->port_fast_age(ds, dp->index);
/* flush all VLANs */
dsa_port_notify_bridge_fdb_flush(dp, 0);
}
static int dsa_port_vlan_fast_age(const struct dsa_port *dp, u16 vid)
{
struct dsa_switch *ds = dp->ds;
int err;
if (!ds->ops->port_vlan_fast_age)
return -EOPNOTSUPP;
err = ds->ops->port_vlan_fast_age(ds, dp->index, vid);
if (!err)
dsa_port_notify_bridge_fdb_flush(dp, vid);
return err;
}
static int dsa_port_msti_fast_age(const struct dsa_port *dp, u16 msti)
{
DECLARE_BITMAP(vids, VLAN_N_VID) = { 0 };
int err, vid;
err = br_mst_get_info(dsa_port_bridge_dev_get(dp), msti, vids);
if (err)
return err;
for_each_set_bit(vid, vids, VLAN_N_VID) {
err = dsa_port_vlan_fast_age(dp, vid);
if (err)
return err;
}
return 0;
}
static bool dsa_port_can_configure_learning(struct dsa_port *dp)
{
struct switchdev_brport_flags flags = {
.mask = BR_LEARNING,
};
struct dsa_switch *ds = dp->ds;
int err;
if (!ds->ops->port_bridge_flags || !ds->ops->port_pre_bridge_flags)
return false;
err = ds->ops->port_pre_bridge_flags(ds, dp->index, flags, NULL);
return !err;
}
bool dsa_port_supports_hwtstamp(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
struct ifreq ifr = {};
int err;
if (!ds->ops->port_hwtstamp_get || !ds->ops->port_hwtstamp_set)
return false;
/* "See through" shim implementations of the "get" method.
* Since we can't cook up a complete ioctl request structure, this will
* fail in copy_to_user() with -EFAULT, which hopefully is enough to
* detect a valid implementation.
*/
err = ds->ops->port_hwtstamp_get(ds, dp->index, &ifr);
return err != -EOPNOTSUPP;
}
int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
if (!ds->ops->port_stp_state_set)
return -EOPNOTSUPP;
ds->ops->port_stp_state_set(ds, port, state);
if (!dsa_port_can_configure_learning(dp) ||
(do_fast_age && dp->learning)) {
/* Fast age FDB entries or flush appropriate forwarding database
* for the given port, if we are moving it from Learning or
* Forwarding state, to Disabled or Blocking or Listening state.
* Ports that were standalone before the STP state change don't
* need to fast age the FDB, since address learning is off in
* standalone mode.
*/
if ((dp->stp_state == BR_STATE_LEARNING ||
dp->stp_state == BR_STATE_FORWARDING) &&
(state == BR_STATE_DISABLED ||
state == BR_STATE_BLOCKING ||
state == BR_STATE_LISTENING))
dsa_port_fast_age(dp);
}
dp->stp_state = state;
return 0;
}
static void dsa_port_set_state_now(struct dsa_port *dp, u8 state,
bool do_fast_age)
{
struct dsa_switch *ds = dp->ds;
int err;
err = dsa_port_set_state(dp, state, do_fast_age);
if (err && err != -EOPNOTSUPP) {
dev_err(ds->dev, "port %d failed to set STP state %u: %pe\n",
dp->index, state, ERR_PTR(err));
}
}
int dsa_port_set_mst_state(struct dsa_port *dp,
const struct switchdev_mst_state *state,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
u8 prev_state;
int err;
if (!ds->ops->port_mst_state_set)
return -EOPNOTSUPP;
err = br_mst_get_state(dsa_port_to_bridge_port(dp), state->msti,
&prev_state);
if (err)
return err;
err = ds->ops->port_mst_state_set(ds, dp->index, state);
if (err)
return err;
if (!(dp->learning &&
(prev_state == BR_STATE_LEARNING ||
prev_state == BR_STATE_FORWARDING) &&
(state->state == BR_STATE_DISABLED ||
state->state == BR_STATE_BLOCKING ||
state->state == BR_STATE_LISTENING)))
return 0;
err = dsa_port_msti_fast_age(dp, state->msti);
if (err)
NL_SET_ERR_MSG_MOD(extack,
"Unable to flush associated VLANs");
return 0;
}
int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
int err;
if (ds->ops->port_enable) {
err = ds->ops->port_enable(ds, port, phy);
if (err)
return err;
}
if (!dp->bridge)
dsa_port_set_state_now(dp, BR_STATE_FORWARDING, false);
if (dp->pl)
phylink_start(dp->pl);
return 0;
}
int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
{
int err;
rtnl_lock();
err = dsa_port_enable_rt(dp, phy);
rtnl_unlock();
return err;
}
void dsa_port_disable_rt(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
if (dp->pl)
phylink_stop(dp->pl);
if (!dp->bridge)
dsa_port_set_state_now(dp, BR_STATE_DISABLED, false);
if (ds->ops->port_disable)
ds->ops->port_disable(ds, port);
}
void dsa_port_disable(struct dsa_port *dp)
{
rtnl_lock();
dsa_port_disable_rt(dp);
rtnl_unlock();
}
static void dsa_port_reset_vlan_filtering(struct dsa_port *dp,
struct dsa_bridge bridge)
{
struct netlink_ext_ack extack = {0};
bool change_vlan_filtering = false;
struct dsa_switch *ds = dp->ds;
struct dsa_port *other_dp;
bool vlan_filtering;
int err;
if (ds->needs_standalone_vlan_filtering &&
!br_vlan_enabled(bridge.dev)) {
change_vlan_filtering = true;
vlan_filtering = true;
} else if (!ds->needs_standalone_vlan_filtering &&
br_vlan_enabled(bridge.dev)) {
change_vlan_filtering = true;
vlan_filtering = false;
}
/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
* event for changing vlan_filtering setting upon user ports leaving
* it. That is a good thing, because that lets us handle it and also
* handle the case where the switch's vlan_filtering setting is global
* (not per port). When that happens, the correct moment to trigger the
* vlan_filtering callback is only when the last port leaves the last
* VLAN-aware bridge.
*/
if (change_vlan_filtering && ds->vlan_filtering_is_global) {
dsa_switch_for_each_port(other_dp, ds) {
struct net_device *br = dsa_port_bridge_dev_get(other_dp);
if (br && br_vlan_enabled(br)) {
change_vlan_filtering = false;
break;
}
}
}
if (!change_vlan_filtering)
return;
err = dsa_port_vlan_filtering(dp, vlan_filtering, &extack);
if (extack._msg) {
dev_err(ds->dev, "port %d: %s\n", dp->index,
extack._msg);
}
if (err && err != -EOPNOTSUPP) {
dev_err(ds->dev,
"port %d failed to reset VLAN filtering to %d: %pe\n",
dp->index, vlan_filtering, ERR_PTR(err));
}
}
static int dsa_port_inherit_brport_flags(struct dsa_port *dp,
struct netlink_ext_ack *extack)
{
const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
BR_BCAST_FLOOD | BR_PORT_LOCKED;
struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
int flag, err;
for_each_set_bit(flag, &mask, 32) {
struct switchdev_brport_flags flags = {0};
flags.mask = BIT(flag);
if (br_port_flag_is_set(brport_dev, BIT(flag)))
flags.val = BIT(flag);
err = dsa_port_bridge_flags(dp, flags, extack);
if (err && err != -EOPNOTSUPP)
return err;
}
return 0;
}
static void dsa_port_clear_brport_flags(struct dsa_port *dp)
{
const unsigned long val = BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
BR_BCAST_FLOOD | BR_PORT_LOCKED;
int flag, err;
for_each_set_bit(flag, &mask, 32) {
struct switchdev_brport_flags flags = {0};
flags.mask = BIT(flag);
flags.val = val & BIT(flag);
err = dsa_port_bridge_flags(dp, flags, NULL);
if (err && err != -EOPNOTSUPP)
dev_err(dp->ds->dev,
"failed to clear bridge port flag %lu: %pe\n",
flags.val, ERR_PTR(err));
}
}
static int dsa_port_switchdev_sync_attrs(struct dsa_port *dp,
struct netlink_ext_ack *extack)
{
struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
struct net_device *br = dsa_port_bridge_dev_get(dp);
int err;
err = dsa_port_inherit_brport_flags(dp, extack);
if (err)
return err;
err = dsa_port_set_state(dp, br_port_get_stp_state(brport_dev), false);
if (err && err != -EOPNOTSUPP)
return err;
err = dsa_port_vlan_filtering(dp, br_vlan_enabled(br), extack);
if (err && err != -EOPNOTSUPP)
return err;
err = dsa_port_ageing_time(dp, br_get_ageing_time(br));
if (err && err != -EOPNOTSUPP)
return err;
return 0;
}
static void dsa_port_switchdev_unsync_attrs(struct dsa_port *dp,
struct dsa_bridge bridge)
{
/* Configure the port for standalone mode (no address learning,
* flood everything).
* The bridge only emits SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS events
* when the user requests it through netlink or sysfs, but not
* automatically at port join or leave, so we need to handle resetting
* the brport flags ourselves. But we even prefer it that way, because
* otherwise, some setups might never get the notification they need,
* for example, when a port leaves a LAG that offloads the bridge,
* it becomes standalone, but as far as the bridge is concerned, no
* port ever left.
*/
dsa_port_clear_brport_flags(dp);
/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
* so allow it to be in BR_STATE_FORWARDING to be kept functional
*/
dsa_port_set_state_now(dp, BR_STATE_FORWARDING, true);
dsa_port_reset_vlan_filtering(dp, bridge);
/* Ageing time may be global to the switch chip, so don't change it
* here because we have no good reason (or value) to change it to.
*/
}
static int dsa_port_bridge_create(struct dsa_port *dp,
struct net_device *br,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
struct dsa_bridge *bridge;
bridge = dsa_tree_bridge_find(ds->dst, br);
if (bridge) {
refcount_inc(&bridge->refcount);
dp->bridge = bridge;
return 0;
}
bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return -ENOMEM;
refcount_set(&bridge->refcount, 1);
bridge->dev = br;
bridge->num = dsa_bridge_num_get(br, ds->max_num_bridges);
if (ds->max_num_bridges && !bridge->num) {
NL_SET_ERR_MSG_MOD(extack,
"Range of offloadable bridges exceeded");
kfree(bridge);
return -EOPNOTSUPP;
}
dp->bridge = bridge;
return 0;
}
static void dsa_port_bridge_destroy(struct dsa_port *dp,
const struct net_device *br)
{
struct dsa_bridge *bridge = dp->bridge;
dp->bridge = NULL;
if (!refcount_dec_and_test(&bridge->refcount))
return;
if (bridge->num)
dsa_bridge_num_put(br, bridge->num);
kfree(bridge);
}
static bool dsa_port_supports_mst(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
return ds->ops->vlan_msti_set &&
ds->ops->port_mst_state_set &&
ds->ops->port_vlan_fast_age &&
dsa_port_can_configure_learning(dp);
}
int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
struct netlink_ext_ack *extack)
{
struct dsa_notifier_bridge_info info = {
.dp = dp,
.extack = extack,
};
struct net_device *dev = dp->user;
struct net_device *brport_dev;
int err;
if (br_mst_enabled(br) && !dsa_port_supports_mst(dp))
return -EOPNOTSUPP;
/* Here the interface is already bridged. Reflect the current
* configuration so that drivers can program their chips accordingly.
*/
err = dsa_port_bridge_create(dp, br, extack);
if (err)
return err;
brport_dev = dsa_port_to_bridge_port(dp);
info.bridge = *dp->bridge;
err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
if (err)
goto out_rollback;
/* Drivers which support bridge TX forwarding should set this */
dp->bridge->tx_fwd_offload = info.tx_fwd_offload;
err = switchdev_bridge_port_offload(brport_dev, dev, dp,
&dsa_user_switchdev_notifier,
&dsa_user_switchdev_blocking_notifier,
dp->bridge->tx_fwd_offload, extack);
if (err)
goto out_rollback_unbridge;
err = dsa_port_switchdev_sync_attrs(dp, extack);
if (err)
goto out_rollback_unoffload;
return 0;
out_rollback_unoffload:
switchdev_bridge_port_unoffload(brport_dev, dp,
&dsa_user_switchdev_notifier,
&dsa_user_switchdev_blocking_notifier);
dsa_flush_workqueue();
out_rollback_unbridge:
dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
out_rollback:
dsa_port_bridge_destroy(dp, br);
return err;
}
void dsa_port_pre_bridge_leave(struct dsa_port *dp, struct net_device *br)
{
struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
/* Don't try to unoffload something that is not offloaded */
if (!brport_dev)
return;
switchdev_bridge_port_unoffload(brport_dev, dp,
&dsa_user_switchdev_notifier,
&dsa_user_switchdev_blocking_notifier);
dsa_flush_workqueue();
}
void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
{
struct dsa_notifier_bridge_info info = {
.dp = dp,
};
int err;
/* If the port could not be offloaded to begin with, then
* there is nothing to do.
*/
if (!dp->bridge)
return;
info.bridge = *dp->bridge;
/* Here the port is already unbridged. Reflect the current configuration
* so that drivers can program their chips accordingly.
*/
dsa_port_bridge_destroy(dp, br);
err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
if (err)
dev_err(dp->ds->dev,
"port %d failed to notify DSA_NOTIFIER_BRIDGE_LEAVE: %pe\n",
dp->index, ERR_PTR(err));
dsa_port_switchdev_unsync_attrs(dp, info.bridge);
}
int dsa_port_lag_change(struct dsa_port *dp,
struct netdev_lag_lower_state_info *linfo)
{
struct dsa_notifier_lag_info info = {
.dp = dp,
};
bool tx_enabled;
if (!dp->lag)
return 0;
/* On statically configured aggregates (e.g. loadbalance
* without LACP) ports will always be tx_enabled, even if the
* link is down. Thus we require both link_up and tx_enabled
* in order to include it in the tx set.
*/
tx_enabled = linfo->link_up && linfo->tx_enabled;
if (tx_enabled == dp->lag_tx_enabled)
return 0;
dp->lag_tx_enabled = tx_enabled;
return dsa_port_notify(dp, DSA_NOTIFIER_LAG_CHANGE, &info);
}
static int dsa_port_lag_create(struct dsa_port *dp,
struct net_device *lag_dev)
{
struct dsa_switch *ds = dp->ds;
struct dsa_lag *lag;
lag = dsa_tree_lag_find(ds->dst, lag_dev);
if (lag) {
refcount_inc(&lag->refcount);
dp->lag = lag;
return 0;
}
lag = kzalloc(sizeof(*lag), GFP_KERNEL);
if (!lag)
return -ENOMEM;
refcount_set(&lag->refcount, 1);
mutex_init(&lag->fdb_lock);
INIT_LIST_HEAD(&lag->fdbs);
lag->dev = lag_dev;
dsa_lag_map(ds->dst, lag);
dp->lag = lag;
return 0;
}
static void dsa_port_lag_destroy(struct dsa_port *dp)
{
struct dsa_lag *lag = dp->lag;
dp->lag = NULL;
dp->lag_tx_enabled = false;
if (!refcount_dec_and_test(&lag->refcount))
return;
WARN_ON(!list_empty(&lag->fdbs));
dsa_lag_unmap(dp->ds->dst, lag);
kfree(lag);
}
int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag_dev,
struct netdev_lag_upper_info *uinfo,
struct netlink_ext_ack *extack)
{
struct dsa_notifier_lag_info info = {
.dp = dp,
.info = uinfo,
.extack = extack,
};
struct net_device *bridge_dev;
int err;
err = dsa_port_lag_create(dp, lag_dev);
if (err)
goto err_lag_create;
info.lag = *dp->lag;
err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info);
if (err)
goto err_lag_join;
bridge_dev = netdev_master_upper_dev_get(lag_dev);
if (!bridge_dev || !netif_is_bridge_master(bridge_dev))
return 0;
err = dsa_port_bridge_join(dp, bridge_dev, extack);
if (err)
goto err_bridge_join;
return 0;
err_bridge_join:
dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
err_lag_join:
dsa_port_lag_destroy(dp);
err_lag_create:
return err;
}
void dsa_port_pre_lag_leave(struct dsa_port *dp, struct net_device *lag_dev)
{
struct net_device *br = dsa_port_bridge_dev_get(dp);
if (br)
dsa_port_pre_bridge_leave(dp, br);
}
void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag_dev)
{
struct net_device *br = dsa_port_bridge_dev_get(dp);
struct dsa_notifier_lag_info info = {
.dp = dp,
};
int err;
if (!dp->lag)
return;
/* Port might have been part of a LAG that in turn was
* attached to a bridge.
*/
if (br)
dsa_port_bridge_leave(dp, br);
info.lag = *dp->lag;
dsa_port_lag_destroy(dp);
err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
if (err)
dev_err(dp->ds->dev,
"port %d failed to notify DSA_NOTIFIER_LAG_LEAVE: %pe\n",
dp->index, ERR_PTR(err));
}
/* Must be called under rcu_read_lock() */
static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
bool vlan_filtering,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
struct dsa_port *other_dp;
int err;
/* VLAN awareness was off, so the question is "can we turn it on".
* We may have had 8021q uppers, those need to go. Make sure we don't
* enter an inconsistent state: deny changing the VLAN awareness state
* as long as we have 8021q uppers.
*/
if (vlan_filtering && dsa_port_is_user(dp)) {
struct net_device *br = dsa_port_bridge_dev_get(dp);
struct net_device *upper_dev, *user = dp->user;
struct list_head *iter;
netdev_for_each_upper_dev_rcu(user, upper_dev, iter) {
struct bridge_vlan_info br_info;
u16 vid;
if (!is_vlan_dev(upper_dev))
continue;
vid = vlan_dev_vlan_id(upper_dev);
/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
* device, respectively the VID is not found, returning
* 0 means success, which is a failure for us here.
*/
err = br_vlan_get_info(br, vid, &br_info);
if (err == 0) {
NL_SET_ERR_MSG_MOD(extack,
"Must first remove VLAN uppers having VIDs also present in bridge");
return false;
}
}
}
if (!ds->vlan_filtering_is_global)
return true;
/* For cases where enabling/disabling VLAN awareness is global to the
* switch, we need to handle the case where multiple bridges span
* different ports of the same switch device and one of them has a
* different setting than what is being requested.
*/
dsa_switch_for_each_port(other_dp, ds) {
struct net_device *other_br = dsa_port_bridge_dev_get(other_dp);
/* If it's the same bridge, it also has same
* vlan_filtering setting => no need to check
*/
if (!other_br || other_br == dsa_port_bridge_dev_get(dp))
continue;
if (br_vlan_enabled(other_br) != vlan_filtering) {
NL_SET_ERR_MSG_MOD(extack,
"VLAN filtering is a global setting");
return false;
}
}
return true;
}
int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
struct netlink_ext_ack *extack)
{
bool old_vlan_filtering = dsa_port_is_vlan_filtering(dp);
struct dsa_switch *ds = dp->ds;
bool apply;
int err;
if (!ds->ops->port_vlan_filtering)
return -EOPNOTSUPP;
/* We are called from dsa_user_switchdev_blocking_event(),
* which is not under rcu_read_lock(), unlike
* dsa_user_switchdev_event().
*/
rcu_read_lock();
apply = dsa_port_can_apply_vlan_filtering(dp, vlan_filtering, extack);
rcu_read_unlock();
if (!apply)
return -EINVAL;
if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
return 0;
err = ds->ops->port_vlan_filtering(ds, dp->index, vlan_filtering,
extack);
if (err)
return err;
if (ds->vlan_filtering_is_global) {
struct dsa_port *other_dp;
ds->vlan_filtering = vlan_filtering;
dsa_switch_for_each_user_port(other_dp, ds) {
struct net_device *user = other_dp->user;
/* We might be called in the unbind path, so not
* all user devices might still be registered.
*/
if (!user)
continue;
err = dsa_user_manage_vlan_filtering(user,
vlan_filtering);
if (err)
goto restore;
}
} else {
dp->vlan_filtering = vlan_filtering;
err = dsa_user_manage_vlan_filtering(dp->user,
vlan_filtering);
if (err)
goto restore;
}
return 0;
restore:
ds->ops->port_vlan_filtering(ds, dp->index, old_vlan_filtering, NULL);
if (ds->vlan_filtering_is_global)
ds->vlan_filtering = old_vlan_filtering;
else
dp->vlan_filtering = old_vlan_filtering;
return err;
}
/* This enforces legacy behavior for switch drivers which assume they can't
* receive VLAN configuration when joining a bridge with vlan_filtering=0
*/
bool dsa_port_skip_vlan_configuration(struct dsa_port *dp)
{
struct net_device *br = dsa_port_bridge_dev_get(dp);
struct dsa_switch *ds = dp->ds;
if (!br)
return false;
return !ds->configure_vlan_while_not_filtering && !br_vlan_enabled(br);
}
int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock)
{
unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
struct dsa_notifier_ageing_time_info info;
int err;
info.ageing_time = ageing_time;
err = dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
if (err)
return err;
dp->ageing_time = ageing_time;
return 0;
}
int dsa_port_mst_enable(struct dsa_port *dp, bool on,
struct netlink_ext_ack *extack)
{
if (on && !dsa_port_supports_mst(dp)) {
NL_SET_ERR_MSG_MOD(extack, "Hardware does not support MST");
return -EINVAL;
}
return 0;
}
int dsa_port_pre_bridge_flags(const struct dsa_port *dp,
struct switchdev_brport_flags flags,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
if (!ds->ops->port_pre_bridge_flags)
return -EINVAL;
return ds->ops->port_pre_bridge_flags(ds, dp->index, flags, extack);
}
int dsa_port_bridge_flags(struct dsa_port *dp,
struct switchdev_brport_flags flags,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
int err;
if (!ds->ops->port_bridge_flags)
return -EOPNOTSUPP;
err = ds->ops->port_bridge_flags(ds, dp->index, flags, extack);
if (err)
return err;
if (flags.mask & BR_LEARNING) {
bool learning = flags.val & BR_LEARNING;
if (learning == dp->learning)
return 0;
if ((dp->learning && !learning) &&
(dp->stp_state == BR_STATE_LEARNING ||
dp->stp_state == BR_STATE_FORWARDING))
dsa_port_fast_age(dp);
dp->learning = learning;
}
return 0;
}
void dsa_port_set_host_flood(struct dsa_port *dp, bool uc, bool mc)
{
struct dsa_switch *ds = dp->ds;
if (ds->ops->port_set_host_flood)
ds->ops->port_set_host_flood(ds, dp->index, uc, mc);
}
int dsa_port_vlan_msti(struct dsa_port *dp,
const struct switchdev_vlan_msti *msti)
{
struct dsa_switch *ds = dp->ds;
if (!ds->ops->vlan_msti_set)
return -EOPNOTSUPP;
return ds->ops->vlan_msti_set(ds, *dp->bridge, msti);
}
int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu)
{
struct dsa_notifier_mtu_info info = {
.dp = dp,
.mtu = new_mtu,
};
return dsa_port_notify(dp, DSA_NOTIFIER_MTU, &info);
}
int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
u16 vid)
{
struct dsa_notifier_fdb_info info = {
.dp = dp,
.addr = addr,
.vid = vid,
.db = {
.type = DSA_DB_BRIDGE,
.bridge = *dp->bridge,
},
};
/* Refcounting takes bridge.num as a key, and should be global for all
* bridges in the absence of FDB isolation, and per bridge otherwise.
* Force the bridge.num to zero here in the absence of FDB isolation.
*/
if (!dp->ds->fdb_isolation)
info.db.bridge.num = 0;
return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);