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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Handling of a single switch chip, part of a switch fabric
4 *
5 * Copyright (c) 2017 Savoir-faire Linux Inc.
6 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
7 */
8
9#include <linux/if_bridge.h>
10#include <linux/netdevice.h>
11#include <linux/notifier.h>
12#include <linux/if_vlan.h>
13#include <net/switchdev.h>
14
15#include "dsa_priv.h"
16
17static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
18 unsigned int ageing_time)
19{
20 int i;
21
22 for (i = 0; i < ds->num_ports; ++i) {
23 struct dsa_port *dp = dsa_to_port(ds, i);
24
25 if (dp->ageing_time && dp->ageing_time < ageing_time)
26 ageing_time = dp->ageing_time;
27 }
28
29 return ageing_time;
30}
31
32static int dsa_switch_ageing_time(struct dsa_switch *ds,
33 struct dsa_notifier_ageing_time_info *info)
34{
35 unsigned int ageing_time = info->ageing_time;
36
37 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
38 return -ERANGE;
39
40 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
41 return -ERANGE;
42
43 /* Program the fastest ageing time in case of multiple bridges */
44 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
45
46 if (ds->ops->set_ageing_time)
47 return ds->ops->set_ageing_time(ds, ageing_time);
48
49 return 0;
50}
51
52static bool dsa_switch_mtu_match(struct dsa_switch *ds, int port,
53 struct dsa_notifier_mtu_info *info)
54{
55 if (ds->index == info->sw_index && port == info->port)
56 return true;
57
58 /* Do not propagate to other switches in the tree if the notifier was
59 * targeted for a single switch.
60 */
61 if (info->targeted_match)
62 return false;
63
64 if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
65 return true;
66
67 return false;
68}
69
70static int dsa_switch_mtu(struct dsa_switch *ds,
71 struct dsa_notifier_mtu_info *info)
72{
73 int port, ret;
74
75 if (!ds->ops->port_change_mtu)
76 return -EOPNOTSUPP;
77
78 for (port = 0; port < ds->num_ports; port++) {
79 if (dsa_switch_mtu_match(ds, port, info)) {
80 ret = ds->ops->port_change_mtu(ds, port, info->mtu);
81 if (ret)
82 return ret;
83 }
84 }
85
86 return 0;
87}
88
89static int dsa_switch_bridge_join(struct dsa_switch *ds,
90 struct dsa_notifier_bridge_info *info)
91{
92 struct dsa_switch_tree *dst = ds->dst;
93
94 if (dst->index == info->tree_index && ds->index == info->sw_index &&
95 ds->ops->port_bridge_join)
96 return ds->ops->port_bridge_join(ds, info->port, info->br);
97
98 if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
99 ds->ops->crosschip_bridge_join)
100 return ds->ops->crosschip_bridge_join(ds, info->tree_index,
101 info->sw_index,
102 info->port, info->br);
103
104 return 0;
105}
106
107static int dsa_switch_bridge_leave(struct dsa_switch *ds,
108 struct dsa_notifier_bridge_info *info)
109{
110 bool unset_vlan_filtering = br_vlan_enabled(info->br);
111 struct dsa_switch_tree *dst = ds->dst;
112 struct netlink_ext_ack extack = {0};
113 int err, port;
114
115 if (dst->index == info->tree_index && ds->index == info->sw_index &&
116 ds->ops->port_bridge_leave)
117 ds->ops->port_bridge_leave(ds, info->port, info->br);
118
119 if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
120 ds->ops->crosschip_bridge_leave)
121 ds->ops->crosschip_bridge_leave(ds, info->tree_index,
122 info->sw_index, info->port,
123 info->br);
124
125 /* If the bridge was vlan_filtering, the bridge core doesn't trigger an
126 * event for changing vlan_filtering setting upon slave ports leaving
127 * it. That is a good thing, because that lets us handle it and also
128 * handle the case where the switch's vlan_filtering setting is global
129 * (not per port). When that happens, the correct moment to trigger the
130 * vlan_filtering callback is only when the last port leaves the last
131 * VLAN-aware bridge.
132 */
133 if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
134 for (port = 0; port < ds->num_ports; port++) {
135 struct net_device *bridge_dev;
136
137 bridge_dev = dsa_to_port(ds, port)->bridge_dev;
138
139 if (bridge_dev && br_vlan_enabled(bridge_dev)) {
140 unset_vlan_filtering = false;
141 break;
142 }
143 }
144 }
145 if (unset_vlan_filtering) {
146 err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
147 false, &extack);
148 if (extack._msg)
149 dev_err(ds->dev, "port %d: %s\n", info->port,
150 extack._msg);
151 if (err && err != -EOPNOTSUPP)
152 return err;
153 }
154 return 0;
155}
156
157/* Matches for all upstream-facing ports (the CPU port and all upstream-facing
158 * DSA links) that sit between the targeted port on which the notifier was
159 * emitted and its dedicated CPU port.
160 */
161static bool dsa_switch_host_address_match(struct dsa_switch *ds, int port,
162 int info_sw_index, int info_port)
163{
164 struct dsa_port *targeted_dp, *cpu_dp;
165 struct dsa_switch *targeted_ds;
166
167 targeted_ds = dsa_switch_find(ds->dst->index, info_sw_index);
168 targeted_dp = dsa_to_port(targeted_ds, info_port);
169 cpu_dp = targeted_dp->cpu_dp;
170
171 if (dsa_switch_is_upstream_of(ds, targeted_ds))
172 return port == dsa_towards_port(ds, cpu_dp->ds->index,
173 cpu_dp->index);
174
175 return false;
176}
177
178static struct dsa_mac_addr *dsa_mac_addr_find(struct list_head *addr_list,
179 const unsigned char *addr,
180 u16 vid)
181{
182 struct dsa_mac_addr *a;
183
184 list_for_each_entry(a, addr_list, list)
185 if (ether_addr_equal(a->addr, addr) && a->vid == vid)
186 return a;
187
188 return NULL;
189}
190
191static int dsa_switch_do_mdb_add(struct dsa_switch *ds, int port,
192 const struct switchdev_obj_port_mdb *mdb)
193{
194 struct dsa_port *dp = dsa_to_port(ds, port);
195 struct dsa_mac_addr *a;
196 int err;
197
198 /* No need to bother with refcounting for user ports */
199 if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
200 return ds->ops->port_mdb_add(ds, port, mdb);
201
202 a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid);
203 if (a) {
204 refcount_inc(&a->refcount);
205 return 0;
206 }
207
208 a = kzalloc(sizeof(*a), GFP_KERNEL);
209 if (!a)
210 return -ENOMEM;
211
212 err = ds->ops->port_mdb_add(ds, port, mdb);
213 if (err) {
214 kfree(a);
215 return err;
216 }
217
218 ether_addr_copy(a->addr, mdb->addr);
219 a->vid = mdb->vid;
220 refcount_set(&a->refcount, 1);
221 list_add_tail(&a->list, &dp->mdbs);
222
223 return 0;
224}
225
226static int dsa_switch_do_mdb_del(struct dsa_switch *ds, int port,
227 const struct switchdev_obj_port_mdb *mdb)
228{
229 struct dsa_port *dp = dsa_to_port(ds, port);
230 struct dsa_mac_addr *a;
231 int err;
232
233 /* No need to bother with refcounting for user ports */
234 if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
235 return ds->ops->port_mdb_del(ds, port, mdb);
236
237 a = dsa_mac_addr_find(&dp->mdbs, mdb->addr, mdb->vid);
238 if (!a)
239 return -ENOENT;
240
241 if (!refcount_dec_and_test(&a->refcount))
242 return 0;
243
244 err = ds->ops->port_mdb_del(ds, port, mdb);
245 if (err) {
246 refcount_inc(&a->refcount);
247 return err;
248 }
249
250 list_del(&a->list);
251 kfree(a);
252
253 return 0;
254}
255
256static int dsa_switch_do_fdb_add(struct dsa_switch *ds, int port,
257 const unsigned char *addr, u16 vid)
258{
259 struct dsa_port *dp = dsa_to_port(ds, port);
260 struct dsa_mac_addr *a;
261 int err;
262
263 /* No need to bother with refcounting for user ports */
264 if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
265 return ds->ops->port_fdb_add(ds, port, addr, vid);
266
267 a = dsa_mac_addr_find(&dp->fdbs, addr, vid);
268 if (a) {
269 refcount_inc(&a->refcount);
270 return 0;
271 }
272
273 a = kzalloc(sizeof(*a), GFP_KERNEL);
274 if (!a)
275 return -ENOMEM;
276
277 err = ds->ops->port_fdb_add(ds, port, addr, vid);
278 if (err) {
279 kfree(a);
280 return err;
281 }
282
283 ether_addr_copy(a->addr, addr);
284 a->vid = vid;
285 refcount_set(&a->refcount, 1);
286 list_add_tail(&a->list, &dp->fdbs);
287
288 return 0;
289}
290
291static int dsa_switch_do_fdb_del(struct dsa_switch *ds, int port,
292 const unsigned char *addr, u16 vid)
293{
294 struct dsa_port *dp = dsa_to_port(ds, port);
295 struct dsa_mac_addr *a;
296 int err;
297
298 /* No need to bother with refcounting for user ports */
299 if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp)))
300 return ds->ops->port_fdb_del(ds, port, addr, vid);
301
302 a = dsa_mac_addr_find(&dp->fdbs, addr, vid);
303 if (!a)
304 return -ENOENT;
305
306 if (!refcount_dec_and_test(&a->refcount))
307 return 0;
308
309 err = ds->ops->port_fdb_del(ds, port, addr, vid);
310 if (err) {
311 refcount_inc(&a->refcount);
312 return err;
313 }
314
315 list_del(&a->list);
316 kfree(a);
317
318 return 0;
319}
320
321static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
322 struct dsa_notifier_fdb_info *info)
323{
324 int err = 0;
325 int port;
326
327 if (!ds->ops->port_fdb_add)
328 return -EOPNOTSUPP;
329
330 for (port = 0; port < ds->num_ports; port++) {
331 if (dsa_switch_host_address_match(ds, port, info->sw_index,
332 info->port)) {
333 err = dsa_switch_do_fdb_add(ds, port, info->addr,
334 info->vid);
335 if (err)
336 break;
337 }
338 }
339
340 return err;
341}
342
343static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
344 struct dsa_notifier_fdb_info *info)
345{
346 int err = 0;
347 int port;
348
349 if (!ds->ops->port_fdb_del)
350 return -EOPNOTSUPP;
351
352 for (port = 0; port < ds->num_ports; port++) {
353 if (dsa_switch_host_address_match(ds, port, info->sw_index,
354 info->port)) {
355 err = dsa_switch_do_fdb_del(ds, port, info->addr,
356 info->vid);
357 if (err)
358 break;
359 }
360 }
361
362 return err;
363}
364
365static int dsa_switch_fdb_add(struct dsa_switch *ds,
366 struct dsa_notifier_fdb_info *info)
367{
368 int port = dsa_towards_port(ds, info->sw_index, info->port);
369
370 if (!ds->ops->port_fdb_add)
371 return -EOPNOTSUPP;
372
373 return dsa_switch_do_fdb_add(ds, port, info->addr, info->vid);
374}
375
376static int dsa_switch_fdb_del(struct dsa_switch *ds,
377 struct dsa_notifier_fdb_info *info)
378{
379 int port = dsa_towards_port(ds, info->sw_index, info->port);
380
381 if (!ds->ops->port_fdb_del)
382 return -EOPNOTSUPP;
383
384 return dsa_switch_do_fdb_del(ds, port, info->addr, info->vid);
385}
386
387static int dsa_switch_hsr_join(struct dsa_switch *ds,
388 struct dsa_notifier_hsr_info *info)
389{
390 if (ds->index == info->sw_index && ds->ops->port_hsr_join)
391 return ds->ops->port_hsr_join(ds, info->port, info->hsr);
392
393 return -EOPNOTSUPP;
394}
395
396static int dsa_switch_hsr_leave(struct dsa_switch *ds,
397 struct dsa_notifier_hsr_info *info)
398{
399 if (ds->index == info->sw_index && ds->ops->port_hsr_leave)
400 return ds->ops->port_hsr_leave(ds, info->port, info->hsr);
401
402 return -EOPNOTSUPP;
403}
404
405static int dsa_switch_lag_change(struct dsa_switch *ds,
406 struct dsa_notifier_lag_info *info)
407{
408 if (ds->index == info->sw_index && ds->ops->port_lag_change)
409 return ds->ops->port_lag_change(ds, info->port);
410
411 if (ds->index != info->sw_index && ds->ops->crosschip_lag_change)
412 return ds->ops->crosschip_lag_change(ds, info->sw_index,
413 info->port);
414
415 return 0;
416}
417
418static int dsa_switch_lag_join(struct dsa_switch *ds,
419 struct dsa_notifier_lag_info *info)
420{
421 if (ds->index == info->sw_index && ds->ops->port_lag_join)
422 return ds->ops->port_lag_join(ds, info->port, info->lag,
423 info->info);
424
425 if (ds->index != info->sw_index && ds->ops->crosschip_lag_join)
426 return ds->ops->crosschip_lag_join(ds, info->sw_index,
427 info->port, info->lag,
428 info->info);
429
430 return -EOPNOTSUPP;
431}
432
433static int dsa_switch_lag_leave(struct dsa_switch *ds,
434 struct dsa_notifier_lag_info *info)
435{
436 if (ds->index == info->sw_index && ds->ops->port_lag_leave)
437 return ds->ops->port_lag_leave(ds, info->port, info->lag);
438
439 if (ds->index != info->sw_index && ds->ops->crosschip_lag_leave)
440 return ds->ops->crosschip_lag_leave(ds, info->sw_index,
441 info->port, info->lag);
442
443 return -EOPNOTSUPP;
444}
445
446static int dsa_switch_mdb_add(struct dsa_switch *ds,
447 struct dsa_notifier_mdb_info *info)
448{
449 int port = dsa_towards_port(ds, info->sw_index, info->port);
450
451 if (!ds->ops->port_mdb_add)
452 return -EOPNOTSUPP;
453
454 return dsa_switch_do_mdb_add(ds, port, info->mdb);
455}
456
457static int dsa_switch_mdb_del(struct dsa_switch *ds,
458 struct dsa_notifier_mdb_info *info)
459{
460 int port = dsa_towards_port(ds, info->sw_index, info->port);
461
462 if (!ds->ops->port_mdb_del)
463 return -EOPNOTSUPP;
464
465 return dsa_switch_do_mdb_del(ds, port, info->mdb);
466}
467
468static int dsa_switch_host_mdb_add(struct dsa_switch *ds,
469 struct dsa_notifier_mdb_info *info)
470{
471 int err = 0;
472 int port;
473
474 if (!ds->ops->port_mdb_add)
475 return -EOPNOTSUPP;
476
477 for (port = 0; port < ds->num_ports; port++) {
478 if (dsa_switch_host_address_match(ds, port, info->sw_index,
479 info->port)) {
480 err = dsa_switch_do_mdb_add(ds, port, info->mdb);
481 if (err)
482 break;
483 }
484 }
485
486 return err;
487}
488
489static int dsa_switch_host_mdb_del(struct dsa_switch *ds,
490 struct dsa_notifier_mdb_info *info)
491{
492 int err = 0;
493 int port;
494
495 if (!ds->ops->port_mdb_del)
496 return -EOPNOTSUPP;
497
498 for (port = 0; port < ds->num_ports; port++) {
499 if (dsa_switch_host_address_match(ds, port, info->sw_index,
500 info->port)) {
501 err = dsa_switch_do_mdb_del(ds, port, info->mdb);
502 if (err)
503 break;
504 }
505 }
506
507 return err;
508}
509
510static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
511 struct dsa_notifier_vlan_info *info)
512{
513 if (ds->index == info->sw_index && port == info->port)
514 return true;
515
516 if (dsa_is_dsa_port(ds, port))
517 return true;
518
519 return false;
520}
521
522static int dsa_switch_vlan_add(struct dsa_switch *ds,
523 struct dsa_notifier_vlan_info *info)
524{
525 int port, err;
526
527 if (!ds->ops->port_vlan_add)
528 return -EOPNOTSUPP;
529
530 for (port = 0; port < ds->num_ports; port++) {
531 if (dsa_switch_vlan_match(ds, port, info)) {
532 err = ds->ops->port_vlan_add(ds, port, info->vlan,
533 info->extack);
534 if (err)
535 return err;
536 }
537 }
538
539 return 0;
540}
541
542static int dsa_switch_vlan_del(struct dsa_switch *ds,
543 struct dsa_notifier_vlan_info *info)
544{
545 if (!ds->ops->port_vlan_del)
546 return -EOPNOTSUPP;
547
548 if (ds->index == info->sw_index)
549 return ds->ops->port_vlan_del(ds, info->port, info->vlan);
550
551 /* Do not deprogram the DSA links as they may be used as conduit
552 * for other VLAN members in the fabric.
553 */
554 return 0;
555}
556
557static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
558 struct dsa_notifier_tag_proto_info *info)
559{
560 const struct dsa_device_ops *tag_ops = info->tag_ops;
561 int port, err;
562
563 if (!ds->ops->change_tag_protocol)
564 return -EOPNOTSUPP;
565
566 ASSERT_RTNL();
567
568 for (port = 0; port < ds->num_ports; port++) {
569 if (!dsa_is_cpu_port(ds, port))
570 continue;
571
572 err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto);
573 if (err)
574 return err;
575
576 dsa_port_set_tag_protocol(dsa_to_port(ds, port), tag_ops);
577 }
578
579 /* Now that changing the tag protocol can no longer fail, let's update
580 * the remaining bits which are "duplicated for faster access", and the
581 * bits that depend on the tagger, such as the MTU.
582 */
583 for (port = 0; port < ds->num_ports; port++) {
584 if (dsa_is_user_port(ds, port)) {
585 struct net_device *slave;
586
587 slave = dsa_to_port(ds, port)->slave;
588 dsa_slave_setup_tagger(slave);
589
590 /* rtnl_mutex is held in dsa_tree_change_tag_proto */
591 dsa_slave_change_mtu(slave, slave->mtu);
592 }
593 }
594
595 return 0;
596}
597
598static int dsa_switch_mrp_add(struct dsa_switch *ds,
599 struct dsa_notifier_mrp_info *info)
600{
601 if (!ds->ops->port_mrp_add)
602 return -EOPNOTSUPP;
603
604 if (ds->index == info->sw_index)
605 return ds->ops->port_mrp_add(ds, info->port, info->mrp);
606
607 return 0;
608}
609
610static int dsa_switch_mrp_del(struct dsa_switch *ds,
611 struct dsa_notifier_mrp_info *info)
612{
613 if (!ds->ops->port_mrp_del)
614 return -EOPNOTSUPP;
615
616 if (ds->index == info->sw_index)
617 return ds->ops->port_mrp_del(ds, info->port, info->mrp);
618
619 return 0;
620}
621
622static int
623dsa_switch_mrp_add_ring_role(struct dsa_switch *ds,
624 struct dsa_notifier_mrp_ring_role_info *info)
625{
626 if (!ds->ops->port_mrp_add)
627 return -EOPNOTSUPP;
628
629 if (ds->index == info->sw_index)
630 return ds->ops->port_mrp_add_ring_role(ds, info->port,
631 info->mrp);
632
633 return 0;
634}
635
636static int
637dsa_switch_mrp_del_ring_role(struct dsa_switch *ds,
638 struct dsa_notifier_mrp_ring_role_info *info)
639{
640 if (!ds->ops->port_mrp_del)
641 return -EOPNOTSUPP;
642
643 if (ds->index == info->sw_index)
644 return ds->ops->port_mrp_del_ring_role(ds, info->port,
645 info->mrp);
646
647 return 0;
648}
649
650static int dsa_switch_event(struct notifier_block *nb,
651 unsigned long event, void *info)
652{
653 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
654 int err;
655
656 switch (event) {
657 case DSA_NOTIFIER_AGEING_TIME:
658 err = dsa_switch_ageing_time(ds, info);
659 break;
660 case DSA_NOTIFIER_BRIDGE_JOIN:
661 err = dsa_switch_bridge_join(ds, info);
662 break;
663 case DSA_NOTIFIER_BRIDGE_LEAVE:
664 err = dsa_switch_bridge_leave(ds, info);
665 break;
666 case DSA_NOTIFIER_FDB_ADD:
667 err = dsa_switch_fdb_add(ds, info);
668 break;
669 case DSA_NOTIFIER_FDB_DEL:
670 err = dsa_switch_fdb_del(ds, info);
671 break;
672 case DSA_NOTIFIER_HOST_FDB_ADD:
673 err = dsa_switch_host_fdb_add(ds, info);
674 break;
675 case DSA_NOTIFIER_HOST_FDB_DEL:
676 err = dsa_switch_host_fdb_del(ds, info);
677 break;
678 case DSA_NOTIFIER_HSR_JOIN:
679 err = dsa_switch_hsr_join(ds, info);
680 break;
681 case DSA_NOTIFIER_HSR_LEAVE:
682 err = dsa_switch_hsr_leave(ds, info);
683 break;
684 case DSA_NOTIFIER_LAG_CHANGE:
685 err = dsa_switch_lag_change(ds, info);
686 break;
687 case DSA_NOTIFIER_LAG_JOIN:
688 err = dsa_switch_lag_join(ds, info);
689 break;
690 case DSA_NOTIFIER_LAG_LEAVE:
691 err = dsa_switch_lag_leave(ds, info);
692 break;
693 case DSA_NOTIFIER_MDB_ADD:
694 err = dsa_switch_mdb_add(ds, info);
695 break;
696 case DSA_NOTIFIER_MDB_DEL:
697 err = dsa_switch_mdb_del(ds, info);
698 break;
699 case DSA_NOTIFIER_HOST_MDB_ADD:
700 err = dsa_switch_host_mdb_add(ds, info);
701 break;
702 case DSA_NOTIFIER_HOST_MDB_DEL:
703 err = dsa_switch_host_mdb_del(ds, info);
704 break;
705 case DSA_NOTIFIER_VLAN_ADD:
706 err = dsa_switch_vlan_add(ds, info);
707 break;
708 case DSA_NOTIFIER_VLAN_DEL:
709 err = dsa_switch_vlan_del(ds, info);
710 break;
711 case DSA_NOTIFIER_MTU:
712 err = dsa_switch_mtu(ds, info);
713 break;
714 case DSA_NOTIFIER_TAG_PROTO:
715 err = dsa_switch_change_tag_proto(ds, info);
716 break;
717 case DSA_NOTIFIER_MRP_ADD:
718 err = dsa_switch_mrp_add(ds, info);
719 break;
720 case DSA_NOTIFIER_MRP_DEL:
721 err = dsa_switch_mrp_del(ds, info);
722 break;
723 case DSA_NOTIFIER_MRP_ADD_RING_ROLE:
724 err = dsa_switch_mrp_add_ring_role(ds, info);
725 break;
726 case DSA_NOTIFIER_MRP_DEL_RING_ROLE:
727 err = dsa_switch_mrp_del_ring_role(ds, info);
728 break;
729 default:
730 err = -EOPNOTSUPP;
731 break;
732 }
733
734 if (err)
735 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
736 event, err);
737
738 return notifier_from_errno(err);
739}
740
741int dsa_switch_register_notifier(struct dsa_switch *ds)
742{
743 ds->nb.notifier_call = dsa_switch_event;
744
745 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
746}
747
748void dsa_switch_unregister_notifier(struct dsa_switch *ds)
749{
750 int err;
751
752 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
753 if (err)
754 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
755}
1/*
2 * Handling of a single switch chip, part of a switch fabric
3 *
4 * Copyright (c) 2017 Savoir-faire Linux Inc.
5 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <linux/netdevice.h>
14#include <linux/notifier.h>
15#include <net/switchdev.h>
16
17#include "dsa_priv.h"
18
19static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
20 unsigned int ageing_time)
21{
22 int i;
23
24 for (i = 0; i < ds->num_ports; ++i) {
25 struct dsa_port *dp = &ds->ports[i];
26
27 if (dp->ageing_time && dp->ageing_time < ageing_time)
28 ageing_time = dp->ageing_time;
29 }
30
31 return ageing_time;
32}
33
34static int dsa_switch_ageing_time(struct dsa_switch *ds,
35 struct dsa_notifier_ageing_time_info *info)
36{
37 unsigned int ageing_time = info->ageing_time;
38 struct switchdev_trans *trans = info->trans;
39
40 if (switchdev_trans_ph_prepare(trans)) {
41 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
42 return -ERANGE;
43 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
44 return -ERANGE;
45 return 0;
46 }
47
48 /* Program the fastest ageing time in case of multiple bridges */
49 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
50
51 if (ds->ops->set_ageing_time)
52 return ds->ops->set_ageing_time(ds, ageing_time);
53
54 return 0;
55}
56
57static int dsa_switch_bridge_join(struct dsa_switch *ds,
58 struct dsa_notifier_bridge_info *info)
59{
60 if (ds->index == info->sw_index && ds->ops->port_bridge_join)
61 return ds->ops->port_bridge_join(ds, info->port, info->br);
62
63 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
64 return ds->ops->crosschip_bridge_join(ds, info->sw_index,
65 info->port, info->br);
66
67 return 0;
68}
69
70static int dsa_switch_bridge_leave(struct dsa_switch *ds,
71 struct dsa_notifier_bridge_info *info)
72{
73 if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
74 ds->ops->port_bridge_leave(ds, info->port, info->br);
75
76 if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
77 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
78 info->br);
79
80 return 0;
81}
82
83static int dsa_switch_fdb_add(struct dsa_switch *ds,
84 struct dsa_notifier_fdb_info *info)
85{
86 int port = dsa_towards_port(ds, info->sw_index, info->port);
87
88 if (!ds->ops->port_fdb_add)
89 return -EOPNOTSUPP;
90
91 return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
92}
93
94static int dsa_switch_fdb_del(struct dsa_switch *ds,
95 struct dsa_notifier_fdb_info *info)
96{
97 int port = dsa_towards_port(ds, info->sw_index, info->port);
98
99 if (!ds->ops->port_fdb_del)
100 return -EOPNOTSUPP;
101
102 return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
103}
104
105static int
106dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
107 const struct switchdev_obj_port_mdb *mdb,
108 const unsigned long *bitmap)
109{
110 int port, err;
111
112 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
113 return -EOPNOTSUPP;
114
115 for_each_set_bit(port, bitmap, ds->num_ports) {
116 err = ds->ops->port_mdb_prepare(ds, port, mdb);
117 if (err)
118 return err;
119 }
120
121 return 0;
122}
123
124static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
125 const struct switchdev_obj_port_mdb *mdb,
126 const unsigned long *bitmap)
127{
128 int port;
129
130 for_each_set_bit(port, bitmap, ds->num_ports)
131 ds->ops->port_mdb_add(ds, port, mdb);
132}
133
134static int dsa_switch_mdb_add(struct dsa_switch *ds,
135 struct dsa_notifier_mdb_info *info)
136{
137 const struct switchdev_obj_port_mdb *mdb = info->mdb;
138 struct switchdev_trans *trans = info->trans;
139 DECLARE_BITMAP(group, ds->num_ports);
140 int port;
141
142 /* Build a mask of Multicast group members */
143 bitmap_zero(group, ds->num_ports);
144 if (ds->index == info->sw_index)
145 set_bit(info->port, group);
146 for (port = 0; port < ds->num_ports; port++)
147 if (dsa_is_dsa_port(ds, port))
148 set_bit(port, group);
149
150 if (switchdev_trans_ph_prepare(trans))
151 return dsa_switch_mdb_prepare_bitmap(ds, mdb, group);
152
153 dsa_switch_mdb_add_bitmap(ds, mdb, group);
154
155 return 0;
156}
157
158static int dsa_switch_mdb_del(struct dsa_switch *ds,
159 struct dsa_notifier_mdb_info *info)
160{
161 const struct switchdev_obj_port_mdb *mdb = info->mdb;
162
163 if (!ds->ops->port_mdb_del)
164 return -EOPNOTSUPP;
165
166 if (ds->index == info->sw_index)
167 return ds->ops->port_mdb_del(ds, info->port, mdb);
168
169 return 0;
170}
171
172static int
173dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
174 const struct switchdev_obj_port_vlan *vlan,
175 const unsigned long *bitmap)
176{
177 int port, err;
178
179 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
180 return -EOPNOTSUPP;
181
182 for_each_set_bit(port, bitmap, ds->num_ports) {
183 err = ds->ops->port_vlan_prepare(ds, port, vlan);
184 if (err)
185 return err;
186 }
187
188 return 0;
189}
190
191static void
192dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
193 const struct switchdev_obj_port_vlan *vlan,
194 const unsigned long *bitmap)
195{
196 int port;
197
198 for_each_set_bit(port, bitmap, ds->num_ports)
199 ds->ops->port_vlan_add(ds, port, vlan);
200}
201
202static int dsa_switch_vlan_add(struct dsa_switch *ds,
203 struct dsa_notifier_vlan_info *info)
204{
205 const struct switchdev_obj_port_vlan *vlan = info->vlan;
206 struct switchdev_trans *trans = info->trans;
207 DECLARE_BITMAP(members, ds->num_ports);
208 int port;
209
210 /* Build a mask of VLAN members */
211 bitmap_zero(members, ds->num_ports);
212 if (ds->index == info->sw_index)
213 set_bit(info->port, members);
214 for (port = 0; port < ds->num_ports; port++)
215 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
216 set_bit(port, members);
217
218 if (switchdev_trans_ph_prepare(trans))
219 return dsa_switch_vlan_prepare_bitmap(ds, vlan, members);
220
221 dsa_switch_vlan_add_bitmap(ds, vlan, members);
222
223 return 0;
224}
225
226static int dsa_switch_vlan_del(struct dsa_switch *ds,
227 struct dsa_notifier_vlan_info *info)
228{
229 const struct switchdev_obj_port_vlan *vlan = info->vlan;
230
231 if (!ds->ops->port_vlan_del)
232 return -EOPNOTSUPP;
233
234 if (ds->index == info->sw_index)
235 return ds->ops->port_vlan_del(ds, info->port, vlan);
236
237 return 0;
238}
239
240static int dsa_switch_event(struct notifier_block *nb,
241 unsigned long event, void *info)
242{
243 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
244 int err;
245
246 switch (event) {
247 case DSA_NOTIFIER_AGEING_TIME:
248 err = dsa_switch_ageing_time(ds, info);
249 break;
250 case DSA_NOTIFIER_BRIDGE_JOIN:
251 err = dsa_switch_bridge_join(ds, info);
252 break;
253 case DSA_NOTIFIER_BRIDGE_LEAVE:
254 err = dsa_switch_bridge_leave(ds, info);
255 break;
256 case DSA_NOTIFIER_FDB_ADD:
257 err = dsa_switch_fdb_add(ds, info);
258 break;
259 case DSA_NOTIFIER_FDB_DEL:
260 err = dsa_switch_fdb_del(ds, info);
261 break;
262 case DSA_NOTIFIER_MDB_ADD:
263 err = dsa_switch_mdb_add(ds, info);
264 break;
265 case DSA_NOTIFIER_MDB_DEL:
266 err = dsa_switch_mdb_del(ds, info);
267 break;
268 case DSA_NOTIFIER_VLAN_ADD:
269 err = dsa_switch_vlan_add(ds, info);
270 break;
271 case DSA_NOTIFIER_VLAN_DEL:
272 err = dsa_switch_vlan_del(ds, info);
273 break;
274 default:
275 err = -EOPNOTSUPP;
276 break;
277 }
278
279 /* Non-switchdev operations cannot be rolled back. If a DSA driver
280 * returns an error during the chained call, switch chips may be in an
281 * inconsistent state.
282 */
283 if (err)
284 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
285 event, err);
286
287 return notifier_from_errno(err);
288}
289
290int dsa_switch_register_notifier(struct dsa_switch *ds)
291{
292 ds->nb.notifier_call = dsa_switch_event;
293
294 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
295}
296
297void dsa_switch_unregister_notifier(struct dsa_switch *ds)
298{
299 int err;
300
301 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
302 if (err)
303 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
304}