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.h"
16#include "netlink.h"
17#include "port.h"
18#include "switch.h"
19#include "tag_8021q.h"
20#include "trace.h"
21#include "user.h"
22
23static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
24 unsigned int ageing_time)
25{
26 struct dsa_port *dp;
27
28 dsa_switch_for_each_port(dp, ds)
29 if (dp->ageing_time && dp->ageing_time < ageing_time)
30 ageing_time = dp->ageing_time;
31
32 return ageing_time;
33}
34
35static int dsa_switch_ageing_time(struct dsa_switch *ds,
36 struct dsa_notifier_ageing_time_info *info)
37{
38 unsigned int ageing_time = info->ageing_time;
39
40 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
41 return -ERANGE;
42
43 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
44 return -ERANGE;
45
46 /* Program the fastest ageing time in case of multiple bridges */
47 ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
48
49 if (ds->ops->set_ageing_time)
50 return ds->ops->set_ageing_time(ds, ageing_time);
51
52 return 0;
53}
54
55static bool dsa_port_mtu_match(struct dsa_port *dp,
56 struct dsa_notifier_mtu_info *info)
57{
58 return dp == info->dp || dsa_port_is_dsa(port: dp) || dsa_port_is_cpu(port: dp);
59}
60
61static int dsa_switch_mtu(struct dsa_switch *ds,
62 struct dsa_notifier_mtu_info *info)
63{
64 struct dsa_port *dp;
65 int ret;
66
67 if (!ds->ops->port_change_mtu)
68 return -EOPNOTSUPP;
69
70 dsa_switch_for_each_port(dp, ds) {
71 if (dsa_port_mtu_match(dp, info)) {
72 ret = ds->ops->port_change_mtu(ds, dp->index,
73 info->mtu);
74 if (ret)
75 return ret;
76 }
77 }
78
79 return 0;
80}
81
82static int dsa_switch_bridge_join(struct dsa_switch *ds,
83 struct dsa_notifier_bridge_info *info)
84{
85 int err;
86
87 if (info->dp->ds == ds) {
88 if (!ds->ops->port_bridge_join)
89 return -EOPNOTSUPP;
90
91 err = ds->ops->port_bridge_join(ds, info->dp->index,
92 info->bridge,
93 &info->tx_fwd_offload,
94 info->extack);
95 if (err)
96 return err;
97 }
98
99 if (info->dp->ds != ds && ds->ops->crosschip_bridge_join) {
100 err = ds->ops->crosschip_bridge_join(ds,
101 info->dp->ds->dst->index,
102 info->dp->ds->index,
103 info->dp->index,
104 info->bridge,
105 info->extack);
106 if (err)
107 return err;
108 }
109
110 return 0;
111}
112
113static int dsa_switch_bridge_leave(struct dsa_switch *ds,
114 struct dsa_notifier_bridge_info *info)
115{
116 if (info->dp->ds == ds && ds->ops->port_bridge_leave)
117 ds->ops->port_bridge_leave(ds, info->dp->index, info->bridge);
118
119 if (info->dp->ds != ds && ds->ops->crosschip_bridge_leave)
120 ds->ops->crosschip_bridge_leave(ds, info->dp->ds->dst->index,
121 info->dp->ds->index,
122 info->dp->index,
123 info->bridge);
124
125 return 0;
126}
127
128/* Matches for all upstream-facing ports (the CPU port and all upstream-facing
129 * DSA links) that sit between the targeted port on which the notifier was
130 * emitted and its dedicated CPU port.
131 */
132static bool dsa_port_host_address_match(struct dsa_port *dp,
133 const struct dsa_port *targeted_dp)
134{
135 struct dsa_port *cpu_dp = targeted_dp->cpu_dp;
136
137 if (dsa_switch_is_upstream_of(upstream_ds: dp->ds, downstream_ds: targeted_dp->ds))
138 return dp->index == dsa_towards_port(ds: dp->ds, device: cpu_dp->ds->index,
139 port: cpu_dp->index);
140
141 return false;
142}
143
144static struct dsa_mac_addr *dsa_mac_addr_find(struct list_head *addr_list,
145 const unsigned char *addr, u16 vid,
146 struct dsa_db db)
147{
148 struct dsa_mac_addr *a;
149
150 list_for_each_entry(a, addr_list, list)
151 if (ether_addr_equal(addr1: a->addr, addr2: addr) && a->vid == vid &&
152 dsa_db_equal(a: &a->db, b: &db))
153 return a;
154
155 return NULL;
156}
157
158static int dsa_port_do_mdb_add(struct dsa_port *dp,
159 const struct switchdev_obj_port_mdb *mdb,
160 struct dsa_db db)
161{
162 struct dsa_switch *ds = dp->ds;
163 struct dsa_mac_addr *a;
164 int port = dp->index;
165 int err = 0;
166
167 /* No need to bother with refcounting for user ports */
168 if (!(dsa_port_is_cpu(port: dp) || dsa_port_is_dsa(port: dp))) {
169 err = ds->ops->port_mdb_add(ds, port, mdb, db);
170 trace_dsa_mdb_add_hw(dp, addr: mdb->addr, vid: mdb->vid, db: &db, err);
171
172 return err;
173 }
174
175 mutex_lock(&dp->addr_lists_lock);
176
177 a = dsa_mac_addr_find(addr_list: &dp->mdbs, addr: mdb->addr, vid: mdb->vid, db);
178 if (a) {
179 refcount_inc(r: &a->refcount);
180 trace_dsa_mdb_add_bump(dp, addr: mdb->addr, vid: mdb->vid, db: &db,
181 refcount: &a->refcount);
182 goto out;
183 }
184
185 a = kzalloc(sizeof(*a), GFP_KERNEL);
186 if (!a) {
187 err = -ENOMEM;
188 goto out;
189 }
190
191 err = ds->ops->port_mdb_add(ds, port, mdb, db);
192 trace_dsa_mdb_add_hw(dp, addr: mdb->addr, vid: mdb->vid, db: &db, err);
193 if (err) {
194 kfree(objp: a);
195 goto out;
196 }
197
198 ether_addr_copy(dst: a->addr, src: mdb->addr);
199 a->vid = mdb->vid;
200 a->db = db;
201 refcount_set(r: &a->refcount, n: 1);
202 list_add_tail(new: &a->list, head: &dp->mdbs);
203
204out:
205 mutex_unlock(lock: &dp->addr_lists_lock);
206
207 return err;
208}
209
210static int dsa_port_do_mdb_del(struct dsa_port *dp,
211 const struct switchdev_obj_port_mdb *mdb,
212 struct dsa_db db)
213{
214 struct dsa_switch *ds = dp->ds;
215 struct dsa_mac_addr *a;
216 int port = dp->index;
217 int err = 0;
218
219 /* No need to bother with refcounting for user ports */
220 if (!(dsa_port_is_cpu(port: dp) || dsa_port_is_dsa(port: dp))) {
221 err = ds->ops->port_mdb_del(ds, port, mdb, db);
222 trace_dsa_mdb_del_hw(dp, addr: mdb->addr, vid: mdb->vid, db: &db, err);
223
224 return err;
225 }
226
227 mutex_lock(&dp->addr_lists_lock);
228
229 a = dsa_mac_addr_find(addr_list: &dp->mdbs, addr: mdb->addr, vid: mdb->vid, db);
230 if (!a) {
231 trace_dsa_mdb_del_not_found(dp, addr: mdb->addr, vid: mdb->vid, db: &db);
232 err = -ENOENT;
233 goto out;
234 }
235
236 if (!refcount_dec_and_test(r: &a->refcount)) {
237 trace_dsa_mdb_del_drop(dp, addr: mdb->addr, vid: mdb->vid, db: &db,
238 refcount: &a->refcount);
239 goto out;
240 }
241
242 err = ds->ops->port_mdb_del(ds, port, mdb, db);
243 trace_dsa_mdb_del_hw(dp, addr: mdb->addr, vid: mdb->vid, db: &db, err);
244 if (err) {
245 refcount_set(r: &a->refcount, n: 1);
246 goto out;
247 }
248
249 list_del(entry: &a->list);
250 kfree(objp: a);
251
252out:
253 mutex_unlock(lock: &dp->addr_lists_lock);
254
255 return err;
256}
257
258static int dsa_port_do_fdb_add(struct dsa_port *dp, const unsigned char *addr,
259 u16 vid, struct dsa_db db)
260{
261 struct dsa_switch *ds = dp->ds;
262 struct dsa_mac_addr *a;
263 int port = dp->index;
264 int err = 0;
265
266 /* No need to bother with refcounting for user ports */
267 if (!(dsa_port_is_cpu(port: dp) || dsa_port_is_dsa(port: dp))) {
268 err = ds->ops->port_fdb_add(ds, port, addr, vid, db);
269 trace_dsa_fdb_add_hw(dp, addr, vid, db: &db, err);
270
271 return err;
272 }
273
274 mutex_lock(&dp->addr_lists_lock);
275
276 a = dsa_mac_addr_find(addr_list: &dp->fdbs, addr, vid, db);
277 if (a) {
278 refcount_inc(r: &a->refcount);
279 trace_dsa_fdb_add_bump(dp, addr, vid, db: &db, refcount: &a->refcount);
280 goto out;
281 }
282
283 a = kzalloc(sizeof(*a), GFP_KERNEL);
284 if (!a) {
285 err = -ENOMEM;
286 goto out;
287 }
288
289 err = ds->ops->port_fdb_add(ds, port, addr, vid, db);
290 trace_dsa_fdb_add_hw(dp, addr, vid, db: &db, err);
291 if (err) {
292 kfree(objp: a);
293 goto out;
294 }
295
296 ether_addr_copy(dst: a->addr, src: addr);
297 a->vid = vid;
298 a->db = db;
299 refcount_set(r: &a->refcount, n: 1);
300 list_add_tail(new: &a->list, head: &dp->fdbs);
301
302out:
303 mutex_unlock(lock: &dp->addr_lists_lock);
304
305 return err;
306}
307
308static int dsa_port_do_fdb_del(struct dsa_port *dp, const unsigned char *addr,
309 u16 vid, struct dsa_db db)
310{
311 struct dsa_switch *ds = dp->ds;
312 struct dsa_mac_addr *a;
313 int port = dp->index;
314 int err = 0;
315
316 /* No need to bother with refcounting for user ports */
317 if (!(dsa_port_is_cpu(port: dp) || dsa_port_is_dsa(port: dp))) {
318 err = ds->ops->port_fdb_del(ds, port, addr, vid, db);
319 trace_dsa_fdb_del_hw(dp, addr, vid, db: &db, err);
320
321 return err;
322 }
323
324 mutex_lock(&dp->addr_lists_lock);
325
326 a = dsa_mac_addr_find(addr_list: &dp->fdbs, addr, vid, db);
327 if (!a) {
328 trace_dsa_fdb_del_not_found(dp, addr, vid, db: &db);
329 err = -ENOENT;
330 goto out;
331 }
332
333 if (!refcount_dec_and_test(r: &a->refcount)) {
334 trace_dsa_fdb_del_drop(dp, addr, vid, db: &db, refcount: &a->refcount);
335 goto out;
336 }
337
338 err = ds->ops->port_fdb_del(ds, port, addr, vid, db);
339 trace_dsa_fdb_del_hw(dp, addr, vid, db: &db, err);
340 if (err) {
341 refcount_set(r: &a->refcount, n: 1);
342 goto out;
343 }
344
345 list_del(entry: &a->list);
346 kfree(objp: a);
347
348out:
349 mutex_unlock(lock: &dp->addr_lists_lock);
350
351 return err;
352}
353
354static int dsa_switch_do_lag_fdb_add(struct dsa_switch *ds, struct dsa_lag *lag,
355 const unsigned char *addr, u16 vid,
356 struct dsa_db db)
357{
358 struct dsa_mac_addr *a;
359 int err = 0;
360
361 mutex_lock(&lag->fdb_lock);
362
363 a = dsa_mac_addr_find(addr_list: &lag->fdbs, addr, vid, db);
364 if (a) {
365 refcount_inc(r: &a->refcount);
366 trace_dsa_lag_fdb_add_bump(lag_dev: lag->dev, addr, vid, db: &db,
367 refcount: &a->refcount);
368 goto out;
369 }
370
371 a = kzalloc(sizeof(*a), GFP_KERNEL);
372 if (!a) {
373 err = -ENOMEM;
374 goto out;
375 }
376
377 err = ds->ops->lag_fdb_add(ds, *lag, addr, vid, db);
378 trace_dsa_lag_fdb_add_hw(lag_dev: lag->dev, addr, vid, db: &db, err);
379 if (err) {
380 kfree(objp: a);
381 goto out;
382 }
383
384 ether_addr_copy(dst: a->addr, src: addr);
385 a->vid = vid;
386 a->db = db;
387 refcount_set(r: &a->refcount, n: 1);
388 list_add_tail(new: &a->list, head: &lag->fdbs);
389
390out:
391 mutex_unlock(lock: &lag->fdb_lock);
392
393 return err;
394}
395
396static int dsa_switch_do_lag_fdb_del(struct dsa_switch *ds, struct dsa_lag *lag,
397 const unsigned char *addr, u16 vid,
398 struct dsa_db db)
399{
400 struct dsa_mac_addr *a;
401 int err = 0;
402
403 mutex_lock(&lag->fdb_lock);
404
405 a = dsa_mac_addr_find(addr_list: &lag->fdbs, addr, vid, db);
406 if (!a) {
407 trace_dsa_lag_fdb_del_not_found(lag_dev: lag->dev, addr, vid, db: &db);
408 err = -ENOENT;
409 goto out;
410 }
411
412 if (!refcount_dec_and_test(r: &a->refcount)) {
413 trace_dsa_lag_fdb_del_drop(lag_dev: lag->dev, addr, vid, db: &db,
414 refcount: &a->refcount);
415 goto out;
416 }
417
418 err = ds->ops->lag_fdb_del(ds, *lag, addr, vid, db);
419 trace_dsa_lag_fdb_del_hw(lag_dev: lag->dev, addr, vid, db: &db, err);
420 if (err) {
421 refcount_set(r: &a->refcount, n: 1);
422 goto out;
423 }
424
425 list_del(entry: &a->list);
426 kfree(objp: a);
427
428out:
429 mutex_unlock(lock: &lag->fdb_lock);
430
431 return err;
432}
433
434static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
435 struct dsa_notifier_fdb_info *info)
436{
437 struct dsa_port *dp;
438 int err = 0;
439
440 if (!ds->ops->port_fdb_add)
441 return -EOPNOTSUPP;
442
443 dsa_switch_for_each_port(dp, ds) {
444 if (dsa_port_host_address_match(dp, targeted_dp: info->dp)) {
445 if (dsa_port_is_cpu(port: dp) && info->dp->cpu_port_in_lag) {
446 err = dsa_switch_do_lag_fdb_add(ds, lag: dp->lag,
447 addr: info->addr,
448 vid: info->vid,
449 db: info->db);
450 } else {
451 err = dsa_port_do_fdb_add(dp, addr: info->addr,
452 vid: info->vid, db: info->db);
453 }
454 if (err)
455 break;
456 }
457 }
458
459 return err;
460}
461
462static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
463 struct dsa_notifier_fdb_info *info)
464{
465 struct dsa_port *dp;
466 int err = 0;
467
468 if (!ds->ops->port_fdb_del)
469 return -EOPNOTSUPP;
470
471 dsa_switch_for_each_port(dp, ds) {
472 if (dsa_port_host_address_match(dp, targeted_dp: info->dp)) {
473 if (dsa_port_is_cpu(port: dp) && info->dp->cpu_port_in_lag) {
474 err = dsa_switch_do_lag_fdb_del(ds, lag: dp->lag,
475 addr: info->addr,
476 vid: info->vid,
477 db: info->db);
478 } else {
479 err = dsa_port_do_fdb_del(dp, addr: info->addr,
480 vid: info->vid, db: info->db);
481 }
482 if (err)
483 break;
484 }
485 }
486
487 return err;
488}
489
490static int dsa_switch_fdb_add(struct dsa_switch *ds,
491 struct dsa_notifier_fdb_info *info)
492{
493 int port = dsa_towards_port(ds, device: info->dp->ds->index, port: info->dp->index);
494 struct dsa_port *dp = dsa_to_port(ds, p: port);
495
496 if (!ds->ops->port_fdb_add)
497 return -EOPNOTSUPP;
498
499 return dsa_port_do_fdb_add(dp, addr: info->addr, vid: info->vid, db: info->db);
500}
501
502static int dsa_switch_fdb_del(struct dsa_switch *ds,
503 struct dsa_notifier_fdb_info *info)
504{
505 int port = dsa_towards_port(ds, device: info->dp->ds->index, port: info->dp->index);
506 struct dsa_port *dp = dsa_to_port(ds, p: port);
507
508 if (!ds->ops->port_fdb_del)
509 return -EOPNOTSUPP;
510
511 return dsa_port_do_fdb_del(dp, addr: info->addr, vid: info->vid, db: info->db);
512}
513
514static int dsa_switch_lag_fdb_add(struct dsa_switch *ds,
515 struct dsa_notifier_lag_fdb_info *info)
516{
517 struct dsa_port *dp;
518
519 if (!ds->ops->lag_fdb_add)
520 return -EOPNOTSUPP;
521
522 /* Notify switch only if it has a port in this LAG */
523 dsa_switch_for_each_port(dp, ds)
524 if (dsa_port_offloads_lag(dp, lag: info->lag))
525 return dsa_switch_do_lag_fdb_add(ds, lag: info->lag,
526 addr: info->addr, vid: info->vid,
527 db: info->db);
528
529 return 0;
530}
531
532static int dsa_switch_lag_fdb_del(struct dsa_switch *ds,
533 struct dsa_notifier_lag_fdb_info *info)
534{
535 struct dsa_port *dp;
536
537 if (!ds->ops->lag_fdb_del)
538 return -EOPNOTSUPP;
539
540 /* Notify switch only if it has a port in this LAG */
541 dsa_switch_for_each_port(dp, ds)
542 if (dsa_port_offloads_lag(dp, lag: info->lag))
543 return dsa_switch_do_lag_fdb_del(ds, lag: info->lag,
544 addr: info->addr, vid: info->vid,
545 db: info->db);
546
547 return 0;
548}
549
550static int dsa_switch_lag_change(struct dsa_switch *ds,
551 struct dsa_notifier_lag_info *info)
552{
553 if (info->dp->ds == ds && ds->ops->port_lag_change)
554 return ds->ops->port_lag_change(ds, info->dp->index);
555
556 if (info->dp->ds != ds && ds->ops->crosschip_lag_change)
557 return ds->ops->crosschip_lag_change(ds, info->dp->ds->index,
558 info->dp->index);
559
560 return 0;
561}
562
563static int dsa_switch_lag_join(struct dsa_switch *ds,
564 struct dsa_notifier_lag_info *info)
565{
566 if (info->dp->ds == ds && ds->ops->port_lag_join)
567 return ds->ops->port_lag_join(ds, info->dp->index, info->lag,
568 info->info, info->extack);
569
570 if (info->dp->ds != ds && ds->ops->crosschip_lag_join)
571 return ds->ops->crosschip_lag_join(ds, info->dp->ds->index,
572 info->dp->index, info->lag,
573 info->info, info->extack);
574
575 return -EOPNOTSUPP;
576}
577
578static int dsa_switch_lag_leave(struct dsa_switch *ds,
579 struct dsa_notifier_lag_info *info)
580{
581 if (info->dp->ds == ds && ds->ops->port_lag_leave)
582 return ds->ops->port_lag_leave(ds, info->dp->index, info->lag);
583
584 if (info->dp->ds != ds && ds->ops->crosschip_lag_leave)
585 return ds->ops->crosschip_lag_leave(ds, info->dp->ds->index,
586 info->dp->index, info->lag);
587
588 return -EOPNOTSUPP;
589}
590
591static int dsa_switch_mdb_add(struct dsa_switch *ds,
592 struct dsa_notifier_mdb_info *info)
593{
594 int port = dsa_towards_port(ds, device: info->dp->ds->index, port: info->dp->index);
595 struct dsa_port *dp = dsa_to_port(ds, p: port);
596
597 if (!ds->ops->port_mdb_add)
598 return -EOPNOTSUPP;
599
600 return dsa_port_do_mdb_add(dp, mdb: info->mdb, db: info->db);
601}
602
603static int dsa_switch_mdb_del(struct dsa_switch *ds,
604 struct dsa_notifier_mdb_info *info)
605{
606 int port = dsa_towards_port(ds, device: info->dp->ds->index, port: info->dp->index);
607 struct dsa_port *dp = dsa_to_port(ds, p: port);
608
609 if (!ds->ops->port_mdb_del)
610 return -EOPNOTSUPP;
611
612 return dsa_port_do_mdb_del(dp, mdb: info->mdb, db: info->db);
613}
614
615static int dsa_switch_host_mdb_add(struct dsa_switch *ds,
616 struct dsa_notifier_mdb_info *info)
617{
618 struct dsa_port *dp;
619 int err = 0;
620
621 if (!ds->ops->port_mdb_add)
622 return -EOPNOTSUPP;
623
624 dsa_switch_for_each_port(dp, ds) {
625 if (dsa_port_host_address_match(dp, targeted_dp: info->dp)) {
626 err = dsa_port_do_mdb_add(dp, mdb: info->mdb, db: info->db);
627 if (err)
628 break;
629 }
630 }
631
632 return err;
633}
634
635static int dsa_switch_host_mdb_del(struct dsa_switch *ds,
636 struct dsa_notifier_mdb_info *info)
637{
638 struct dsa_port *dp;
639 int err = 0;
640
641 if (!ds->ops->port_mdb_del)
642 return -EOPNOTSUPP;
643
644 dsa_switch_for_each_port(dp, ds) {
645 if (dsa_port_host_address_match(dp, targeted_dp: info->dp)) {
646 err = dsa_port_do_mdb_del(dp, mdb: info->mdb, db: info->db);
647 if (err)
648 break;
649 }
650 }
651
652 return err;
653}
654
655/* Port VLANs match on the targeted port and on all DSA ports */
656static bool dsa_port_vlan_match(struct dsa_port *dp,
657 struct dsa_notifier_vlan_info *info)
658{
659 return dsa_port_is_dsa(port: dp) || dp == info->dp;
660}
661
662/* Host VLANs match on the targeted port's CPU port, and on all DSA ports
663 * (upstream and downstream) of that switch and its upstream switches.
664 */
665static bool dsa_port_host_vlan_match(struct dsa_port *dp,
666 const struct dsa_port *targeted_dp)
667{
668 struct dsa_port *cpu_dp = targeted_dp->cpu_dp;
669
670 if (dsa_switch_is_upstream_of(upstream_ds: dp->ds, downstream_ds: targeted_dp->ds))
671 return dsa_port_is_dsa(port: dp) || dp == cpu_dp;
672
673 return false;
674}
675
676struct dsa_vlan *dsa_vlan_find(struct list_head *vlan_list,
677 const struct switchdev_obj_port_vlan *vlan)
678{
679 struct dsa_vlan *v;
680
681 list_for_each_entry(v, vlan_list, list)
682 if (v->vid == vlan->vid)
683 return v;
684
685 return NULL;
686}
687
688static int dsa_port_do_vlan_add(struct dsa_port *dp,
689 const struct switchdev_obj_port_vlan *vlan,
690 struct netlink_ext_ack *extack)
691{
692 struct dsa_switch *ds = dp->ds;
693 int port = dp->index;
694 struct dsa_vlan *v;
695 int err = 0;
696
697 /* No need to bother with refcounting for user ports. */
698 if (!(dsa_port_is_cpu(port: dp) || dsa_port_is_dsa(port: dp))) {
699 err = ds->ops->port_vlan_add(ds, port, vlan, extack);
700 trace_dsa_vlan_add_hw(dp, vlan, err);
701
702 return err;
703 }
704
705 /* No need to propagate on shared ports the existing VLANs that were
706 * re-notified after just the flags have changed. This would cause a
707 * refcount bump which we need to avoid, since it unbalances the
708 * additions with the deletions.
709 */
710 if (vlan->changed)
711 return 0;
712
713 mutex_lock(&dp->vlans_lock);
714
715 v = dsa_vlan_find(vlan_list: &dp->vlans, vlan);
716 if (v) {
717 refcount_inc(r: &v->refcount);
718 trace_dsa_vlan_add_bump(dp, vlan, refcount: &v->refcount);
719 goto out;
720 }
721
722 v = kzalloc(sizeof(*v), GFP_KERNEL);
723 if (!v) {
724 err = -ENOMEM;
725 goto out;
726 }
727
728 err = ds->ops->port_vlan_add(ds, port, vlan, extack);
729 trace_dsa_vlan_add_hw(dp, vlan, err);
730 if (err) {
731 kfree(objp: v);
732 goto out;
733 }
734
735 v->vid = vlan->vid;
736 refcount_set(r: &v->refcount, n: 1);
737 list_add_tail(new: &v->list, head: &dp->vlans);
738
739out:
740 mutex_unlock(lock: &dp->vlans_lock);
741
742 return err;
743}
744
745static int dsa_port_do_vlan_del(struct dsa_port *dp,
746 const struct switchdev_obj_port_vlan *vlan)
747{
748 struct dsa_switch *ds = dp->ds;
749 int port = dp->index;
750 struct dsa_vlan *v;
751 int err = 0;
752
753 /* No need to bother with refcounting for user ports */
754 if (!(dsa_port_is_cpu(port: dp) || dsa_port_is_dsa(port: dp))) {
755 err = ds->ops->port_vlan_del(ds, port, vlan);
756 trace_dsa_vlan_del_hw(dp, vlan, err);
757
758 return err;
759 }
760
761 mutex_lock(&dp->vlans_lock);
762
763 v = dsa_vlan_find(vlan_list: &dp->vlans, vlan);
764 if (!v) {
765 trace_dsa_vlan_del_not_found(dp, vlan);
766 err = -ENOENT;
767 goto out;
768 }
769
770 if (!refcount_dec_and_test(r: &v->refcount)) {
771 trace_dsa_vlan_del_drop(dp, vlan, refcount: &v->refcount);
772 goto out;
773 }
774
775 err = ds->ops->port_vlan_del(ds, port, vlan);
776 trace_dsa_vlan_del_hw(dp, vlan, err);
777 if (err) {
778 refcount_set(r: &v->refcount, n: 1);
779 goto out;
780 }
781
782 list_del(entry: &v->list);
783 kfree(objp: v);
784
785out:
786 mutex_unlock(lock: &dp->vlans_lock);
787
788 return err;
789}
790
791static int dsa_switch_vlan_add(struct dsa_switch *ds,
792 struct dsa_notifier_vlan_info *info)
793{
794 struct dsa_port *dp;
795 int err;
796
797 if (!ds->ops->port_vlan_add)
798 return -EOPNOTSUPP;
799
800 dsa_switch_for_each_port(dp, ds) {
801 if (dsa_port_vlan_match(dp, info)) {
802 err = dsa_port_do_vlan_add(dp, vlan: info->vlan,
803 extack: info->extack);
804 if (err)
805 return err;
806 }
807 }
808
809 return 0;
810}
811
812static int dsa_switch_vlan_del(struct dsa_switch *ds,
813 struct dsa_notifier_vlan_info *info)
814{
815 struct dsa_port *dp;
816 int err;
817
818 if (!ds->ops->port_vlan_del)
819 return -EOPNOTSUPP;
820
821 dsa_switch_for_each_port(dp, ds) {
822 if (dsa_port_vlan_match(dp, info)) {
823 err = dsa_port_do_vlan_del(dp, vlan: info->vlan);
824 if (err)
825 return err;
826 }
827 }
828
829 return 0;
830}
831
832static int dsa_switch_host_vlan_add(struct dsa_switch *ds,
833 struct dsa_notifier_vlan_info *info)
834{
835 struct dsa_port *dp;
836 int err;
837
838 if (!ds->ops->port_vlan_add)
839 return -EOPNOTSUPP;
840
841 dsa_switch_for_each_port(dp, ds) {
842 if (dsa_port_host_vlan_match(dp, targeted_dp: info->dp)) {
843 err = dsa_port_do_vlan_add(dp, vlan: info->vlan,
844 extack: info->extack);
845 if (err)
846 return err;
847 }
848 }
849
850 return 0;
851}
852
853static int dsa_switch_host_vlan_del(struct dsa_switch *ds,
854 struct dsa_notifier_vlan_info *info)
855{
856 struct dsa_port *dp;
857 int err;
858
859 if (!ds->ops->port_vlan_del)
860 return -EOPNOTSUPP;
861
862 dsa_switch_for_each_port(dp, ds) {
863 if (dsa_port_host_vlan_match(dp, targeted_dp: info->dp)) {
864 err = dsa_port_do_vlan_del(dp, vlan: info->vlan);
865 if (err)
866 return err;
867 }
868 }
869
870 return 0;
871}
872
873static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
874 struct dsa_notifier_tag_proto_info *info)
875{
876 const struct dsa_device_ops *tag_ops = info->tag_ops;
877 struct dsa_port *dp, *cpu_dp;
878 int err;
879
880 if (!ds->ops->change_tag_protocol)
881 return -EOPNOTSUPP;
882
883 ASSERT_RTNL();
884
885 err = ds->ops->change_tag_protocol(ds, tag_ops->proto);
886 if (err)
887 return err;
888
889 dsa_switch_for_each_cpu_port(cpu_dp, ds)
890 dsa_port_set_tag_protocol(cpu_dp, tag_ops);
891
892 /* Now that changing the tag protocol can no longer fail, let's update
893 * the remaining bits which are "duplicated for faster access", and the
894 * bits that depend on the tagger, such as the MTU.
895 */
896 dsa_switch_for_each_user_port(dp, ds) {
897 struct net_device *user = dp->user;
898
899 dsa_user_setup_tagger(user);
900
901 /* rtnl_mutex is held in dsa_tree_change_tag_proto */
902 dsa_user_change_mtu(dev: user, new_mtu: user->mtu);
903 }
904
905 return 0;
906}
907
908/* We use the same cross-chip notifiers to inform both the tagger side, as well
909 * as the switch side, of connection and disconnection events.
910 * Since ds->tagger_data is owned by the tagger, it isn't a hard error if the
911 * switch side doesn't support connecting to this tagger, and therefore, the
912 * fact that we don't disconnect the tagger side doesn't constitute a memory
913 * leak: the tagger will still operate with persistent per-switch memory, just
914 * with the switch side unconnected to it. What does constitute a hard error is
915 * when the switch side supports connecting but fails.
916 */
917static int
918dsa_switch_connect_tag_proto(struct dsa_switch *ds,
919 struct dsa_notifier_tag_proto_info *info)
920{
921 const struct dsa_device_ops *tag_ops = info->tag_ops;
922 int err;
923
924 /* Notify the new tagger about the connection to this switch */
925 if (tag_ops->connect) {
926 err = tag_ops->connect(ds);
927 if (err)
928 return err;
929 }
930
931 if (!ds->ops->connect_tag_protocol)
932 return -EOPNOTSUPP;
933
934 /* Notify the switch about the connection to the new tagger */
935 err = ds->ops->connect_tag_protocol(ds, tag_ops->proto);
936 if (err) {
937 /* Revert the new tagger's connection to this tree */
938 if (tag_ops->disconnect)
939 tag_ops->disconnect(ds);
940 return err;
941 }
942
943 return 0;
944}
945
946static int
947dsa_switch_disconnect_tag_proto(struct dsa_switch *ds,
948 struct dsa_notifier_tag_proto_info *info)
949{
950 const struct dsa_device_ops *tag_ops = info->tag_ops;
951
952 /* Notify the tagger about the disconnection from this switch */
953 if (tag_ops->disconnect && ds->tagger_data)
954 tag_ops->disconnect(ds);
955
956 /* No need to notify the switch, since it shouldn't have any
957 * resources to tear down
958 */
959 return 0;
960}
961
962static int
963dsa_switch_conduit_state_change(struct dsa_switch *ds,
964 struct dsa_notifier_conduit_state_info *info)
965{
966 if (!ds->ops->conduit_state_change)
967 return 0;
968
969 ds->ops->conduit_state_change(ds, info->conduit, info->operational);
970
971 return 0;
972}
973
974static int dsa_switch_event(struct notifier_block *nb,
975 unsigned long event, void *info)
976{
977 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
978 int err;
979
980 switch (event) {
981 case DSA_NOTIFIER_AGEING_TIME:
982 err = dsa_switch_ageing_time(ds, info);
983 break;
984 case DSA_NOTIFIER_BRIDGE_JOIN:
985 err = dsa_switch_bridge_join(ds, info);
986 break;
987 case DSA_NOTIFIER_BRIDGE_LEAVE:
988 err = dsa_switch_bridge_leave(ds, info);
989 break;
990 case DSA_NOTIFIER_FDB_ADD:
991 err = dsa_switch_fdb_add(ds, info);
992 break;
993 case DSA_NOTIFIER_FDB_DEL:
994 err = dsa_switch_fdb_del(ds, info);
995 break;
996 case DSA_NOTIFIER_HOST_FDB_ADD:
997 err = dsa_switch_host_fdb_add(ds, info);
998 break;
999 case DSA_NOTIFIER_HOST_FDB_DEL:
1000 err = dsa_switch_host_fdb_del(ds, info);
1001 break;
1002 case DSA_NOTIFIER_LAG_FDB_ADD:
1003 err = dsa_switch_lag_fdb_add(ds, info);
1004 break;
1005 case DSA_NOTIFIER_LAG_FDB_DEL:
1006 err = dsa_switch_lag_fdb_del(ds, info);
1007 break;
1008 case DSA_NOTIFIER_LAG_CHANGE:
1009 err = dsa_switch_lag_change(ds, info);
1010 break;
1011 case DSA_NOTIFIER_LAG_JOIN:
1012 err = dsa_switch_lag_join(ds, info);
1013 break;
1014 case DSA_NOTIFIER_LAG_LEAVE:
1015 err = dsa_switch_lag_leave(ds, info);
1016 break;
1017 case DSA_NOTIFIER_MDB_ADD:
1018 err = dsa_switch_mdb_add(ds, info);
1019 break;
1020 case DSA_NOTIFIER_MDB_DEL:
1021 err = dsa_switch_mdb_del(ds, info);
1022 break;
1023 case DSA_NOTIFIER_HOST_MDB_ADD:
1024 err = dsa_switch_host_mdb_add(ds, info);
1025 break;
1026 case DSA_NOTIFIER_HOST_MDB_DEL:
1027 err = dsa_switch_host_mdb_del(ds, info);
1028 break;
1029 case DSA_NOTIFIER_VLAN_ADD:
1030 err = dsa_switch_vlan_add(ds, info);
1031 break;
1032 case DSA_NOTIFIER_VLAN_DEL:
1033 err = dsa_switch_vlan_del(ds, info);
1034 break;
1035 case DSA_NOTIFIER_HOST_VLAN_ADD:
1036 err = dsa_switch_host_vlan_add(ds, info);
1037 break;
1038 case DSA_NOTIFIER_HOST_VLAN_DEL:
1039 err = dsa_switch_host_vlan_del(ds, info);
1040 break;
1041 case DSA_NOTIFIER_MTU:
1042 err = dsa_switch_mtu(ds, info);
1043 break;
1044 case DSA_NOTIFIER_TAG_PROTO:
1045 err = dsa_switch_change_tag_proto(ds, info);
1046 break;
1047 case DSA_NOTIFIER_TAG_PROTO_CONNECT:
1048 err = dsa_switch_connect_tag_proto(ds, info);
1049 break;
1050 case DSA_NOTIFIER_TAG_PROTO_DISCONNECT:
1051 err = dsa_switch_disconnect_tag_proto(ds, info);
1052 break;
1053 case DSA_NOTIFIER_TAG_8021Q_VLAN_ADD:
1054 err = dsa_switch_tag_8021q_vlan_add(ds, info);
1055 break;
1056 case DSA_NOTIFIER_TAG_8021Q_VLAN_DEL:
1057 err = dsa_switch_tag_8021q_vlan_del(ds, info);
1058 break;
1059 case DSA_NOTIFIER_CONDUIT_STATE_CHANGE:
1060 err = dsa_switch_conduit_state_change(ds, info);
1061 break;
1062 default:
1063 err = -EOPNOTSUPP;
1064 break;
1065 }
1066
1067 if (err)
1068 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
1069 event, err);
1070
1071 return notifier_from_errno(err);
1072}
1073
1074/**
1075 * dsa_tree_notify - Execute code for all switches in a DSA switch tree.
1076 * @dst: collection of struct dsa_switch devices to notify.
1077 * @e: event, must be of type DSA_NOTIFIER_*
1078 * @v: event-specific value.
1079 *
1080 * Given a struct dsa_switch_tree, this can be used to run a function once for
1081 * each member DSA switch. The other alternative of traversing the tree is only
1082 * through its ports list, which does not uniquely list the switches.
1083 */
1084int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v)
1085{
1086 struct raw_notifier_head *nh = &dst->nh;
1087 int err;
1088
1089 err = raw_notifier_call_chain(nh, val: e, v);
1090
1091 return notifier_to_errno(ret: err);
1092}
1093
1094/**
1095 * dsa_broadcast - Notify all DSA trees in the system.
1096 * @e: event, must be of type DSA_NOTIFIER_*
1097 * @v: event-specific value.
1098 *
1099 * Can be used to notify the switching fabric of events such as cross-chip
1100 * bridging between disjoint trees (such as islands of tagger-compatible
1101 * switches bridged by an incompatible middle switch).
1102 *
1103 * WARNING: this function is not reliable during probe time, because probing
1104 * between trees is asynchronous and not all DSA trees might have probed.
1105 */
1106int dsa_broadcast(unsigned long e, void *v)
1107{
1108 struct dsa_switch_tree *dst;
1109 int err = 0;
1110
1111 list_for_each_entry(dst, &dsa_tree_list, list) {
1112 err = dsa_tree_notify(dst, e, v);
1113 if (err)
1114 break;
1115 }
1116
1117 return err;
1118}
1119
1120int dsa_switch_register_notifier(struct dsa_switch *ds)
1121{
1122 ds->nb.notifier_call = dsa_switch_event;
1123
1124 return raw_notifier_chain_register(nh: &ds->dst->nh, nb: &ds->nb);
1125}
1126
1127void dsa_switch_unregister_notifier(struct dsa_switch *ds)
1128{
1129 int err;
1130
1131 err = raw_notifier_chain_unregister(nh: &ds->dst->nh, nb: &ds->nb);
1132 if (err)
1133 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
1134}
1135

source code of linux/net/dsa/switch.c