projects/linux·blob v5.19-rc3 · refs

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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/switchdev/switchdev.c - Switch device API
4 * Copyright (c) 2014-2015 Jiri Pirko <[email protected]>
5 * Copyright (c) 2014-2015 Scott Feldman <[email protected]>
6 */
7
8#include <linux/kernel.h>
9#include <linux/types.h>
10#include <linux/init.h>
11#include <linux/mutex.h>
12#include <linux/notifier.h>
13#include <linux/netdevice.h>
14#include <linux/etherdevice.h>
15#include <linux/if_bridge.h>
16#include <linux/list.h>
17#include <linux/workqueue.h>
18#include <linux/if_vlan.h>
19#include <linux/rtnetlink.h>
20#include <net/switchdev.h>
21
22static LIST_HEAD(deferred);
23static DEFINE_SPINLOCK(deferred_lock);
24
25typedef void switchdev_deferred_func_t(struct net_device *dev,
26 const void *data);
27
28struct switchdev_deferred_item {
29 struct list_head list;
30 struct net_device *dev;
31 netdevice_tracker dev_tracker;
32 switchdev_deferred_func_t *func;
33 unsigned long data[];
34};
35
36static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
37{
38 struct switchdev_deferred_item *dfitem;
39
40 spin_lock_bh(&deferred_lock);
41 if (list_empty(&deferred)) {
42 dfitem = NULL;
43 goto unlock;
44 }
45 dfitem = list_first_entry(&deferred,
46 struct switchdev_deferred_item, list);
47 list_del(&dfitem->list);
48unlock:
49 spin_unlock_bh(&deferred_lock);
50 return dfitem;
51}
52
53/**
54 * switchdev_deferred_process - Process ops in deferred queue
55 *
56 * Called to flush the ops currently queued in deferred ops queue.
57 * rtnl_lock must be held.
58 */
59void switchdev_deferred_process(void)
60{
61 struct switchdev_deferred_item *dfitem;
62
63 ASSERT_RTNL();
64
65 while ((dfitem = switchdev_deferred_dequeue())) {
66 dfitem->func(dfitem->dev, dfitem->data);
67 dev_put_track(dfitem->dev, &dfitem->dev_tracker);
68 kfree(dfitem);
69 }
70}
71EXPORT_SYMBOL_GPL(switchdev_deferred_process);
72
73static void switchdev_deferred_process_work(struct work_struct *work)
74{
75 rtnl_lock();
76 switchdev_deferred_process();
77 rtnl_unlock();
78}
79
80static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
81
82static int switchdev_deferred_enqueue(struct net_device *dev,
83 const void *data, size_t data_len,
84 switchdev_deferred_func_t *func)
85{
86 struct switchdev_deferred_item *dfitem;
87
88 dfitem = kmalloc(struct_size(dfitem, data, data_len), GFP_ATOMIC);
89 if (!dfitem)
90 return -ENOMEM;
91 dfitem->dev = dev;
92 dfitem->func = func;
93 memcpy(dfitem->data, data, data_len);
94 dev_hold_track(dev, &dfitem->dev_tracker, GFP_ATOMIC);
95 spin_lock_bh(&deferred_lock);
96 list_add_tail(&dfitem->list, &deferred);
97 spin_unlock_bh(&deferred_lock);
98 schedule_work(&deferred_process_work);
99 return 0;
100}
101
102static int switchdev_port_attr_notify(enum switchdev_notifier_type nt,
103 struct net_device *dev,
104 const struct switchdev_attr *attr,
105 struct netlink_ext_ack *extack)
106{
107 int err;
108 int rc;
109
110 struct switchdev_notifier_port_attr_info attr_info = {
111 .attr = attr,
112 .handled = false,
113 };
114
115 rc = call_switchdev_blocking_notifiers(nt, dev,
116 &attr_info.info, extack);
117 err = notifier_to_errno(rc);
118 if (err) {
119 WARN_ON(!attr_info.handled);
120 return err;
121 }
122
123 if (!attr_info.handled)
124 return -EOPNOTSUPP;
125
126 return 0;
127}
128
129static int switchdev_port_attr_set_now(struct net_device *dev,
130 const struct switchdev_attr *attr,
131 struct netlink_ext_ack *extack)
132{
133 return switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
134 extack);
135}
136
137static void switchdev_port_attr_set_deferred(struct net_device *dev,
138 const void *data)
139{
140 const struct switchdev_attr *attr = data;
141 int err;
142
143 err = switchdev_port_attr_set_now(dev, attr, NULL);
144 if (err && err != -EOPNOTSUPP)
145 netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
146 err, attr->id);
147 if (attr->complete)
148 attr->complete(dev, err, attr->complete_priv);
149}
150
151static int switchdev_port_attr_set_defer(struct net_device *dev,
152 const struct switchdev_attr *attr)
153{
154 return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
155 switchdev_port_attr_set_deferred);
156}
157
158/**
159 * switchdev_port_attr_set - Set port attribute
160 *
161 * @dev: port device
162 * @attr: attribute to set
163 * @extack: netlink extended ack, for error message propagation
164 *
165 * rtnl_lock must be held and must not be in atomic section,
166 * in case SWITCHDEV_F_DEFER flag is not set.
167 */
168int switchdev_port_attr_set(struct net_device *dev,
169 const struct switchdev_attr *attr,
170 struct netlink_ext_ack *extack)
171{
172 if (attr->flags & SWITCHDEV_F_DEFER)
173 return switchdev_port_attr_set_defer(dev, attr);
174 ASSERT_RTNL();
175 return switchdev_port_attr_set_now(dev, attr, extack);
176}
177EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
178
179static size_t switchdev_obj_size(const struct switchdev_obj *obj)
180{
181 switch (obj->id) {
182 case SWITCHDEV_OBJ_ID_PORT_VLAN:
183 return sizeof(struct switchdev_obj_port_vlan);
184 case SWITCHDEV_OBJ_ID_PORT_MDB:
185 return sizeof(struct switchdev_obj_port_mdb);
186 case SWITCHDEV_OBJ_ID_HOST_MDB:
187 return sizeof(struct switchdev_obj_port_mdb);
188 default:
189 BUG();
190 }
191 return 0;
192}
193
194static int switchdev_port_obj_notify(enum switchdev_notifier_type nt,
195 struct net_device *dev,
196 const struct switchdev_obj *obj,
197 struct netlink_ext_ack *extack)
198{
199 int rc;
200 int err;
201
202 struct switchdev_notifier_port_obj_info obj_info = {
203 .obj = obj,
204 .handled = false,
205 };
206
207 rc = call_switchdev_blocking_notifiers(nt, dev, &obj_info.info, extack);
208 err = notifier_to_errno(rc);
209 if (err) {
210 WARN_ON(!obj_info.handled);
211 return err;
212 }
213 if (!obj_info.handled)
214 return -EOPNOTSUPP;
215 return 0;
216}
217
218static void switchdev_port_obj_add_deferred(struct net_device *dev,
219 const void *data)
220{
221 const struct switchdev_obj *obj = data;
222 int err;
223
224 ASSERT_RTNL();
225 err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
226 dev, obj, NULL);
227 if (err && err != -EOPNOTSUPP)
228 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
229 err, obj->id);
230 if (obj->complete)
231 obj->complete(dev, err, obj->complete_priv);
232}
233
234static int switchdev_port_obj_add_defer(struct net_device *dev,
235 const struct switchdev_obj *obj)
236{
237 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
238 switchdev_port_obj_add_deferred);
239}
240
241/**
242 * switchdev_port_obj_add - Add port object
243 *
244 * @dev: port device
245 * @obj: object to add
246 * @extack: netlink extended ack
247 *
248 * rtnl_lock must be held and must not be in atomic section,
249 * in case SWITCHDEV_F_DEFER flag is not set.
250 */
251int switchdev_port_obj_add(struct net_device *dev,
252 const struct switchdev_obj *obj,
253 struct netlink_ext_ack *extack)
254{
255 if (obj->flags & SWITCHDEV_F_DEFER)
256 return switchdev_port_obj_add_defer(dev, obj);
257 ASSERT_RTNL();
258 return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
259 dev, obj, extack);
260}
261EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
262
263static int switchdev_port_obj_del_now(struct net_device *dev,
264 const struct switchdev_obj *obj)
265{
266 return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_DEL,
267 dev, obj, NULL);
268}
269
270static void switchdev_port_obj_del_deferred(struct net_device *dev,
271 const void *data)
272{
273 const struct switchdev_obj *obj = data;
274 int err;
275
276 err = switchdev_port_obj_del_now(dev, obj);
277 if (err && err != -EOPNOTSUPP)
278 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
279 err, obj->id);
280 if (obj->complete)
281 obj->complete(dev, err, obj->complete_priv);
282}
283
284static int switchdev_port_obj_del_defer(struct net_device *dev,
285 const struct switchdev_obj *obj)
286{
287 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
288 switchdev_port_obj_del_deferred);
289}
290
291/**
292 * switchdev_port_obj_del - Delete port object
293 *
294 * @dev: port device
295 * @obj: object to delete
296 *
297 * rtnl_lock must be held and must not be in atomic section,
298 * in case SWITCHDEV_F_DEFER flag is not set.
299 */
300int switchdev_port_obj_del(struct net_device *dev,
301 const struct switchdev_obj *obj)
302{
303 if (obj->flags & SWITCHDEV_F_DEFER)
304 return switchdev_port_obj_del_defer(dev, obj);
305 ASSERT_RTNL();
306 return switchdev_port_obj_del_now(dev, obj);
307}
308EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
309
310static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
311static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain);
312
313/**
314 * register_switchdev_notifier - Register notifier
315 * @nb: notifier_block
316 *
317 * Register switch device notifier.
318 */
319int register_switchdev_notifier(struct notifier_block *nb)
320{
321 return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
322}
323EXPORT_SYMBOL_GPL(register_switchdev_notifier);
324
325/**
326 * unregister_switchdev_notifier - Unregister notifier
327 * @nb: notifier_block
328 *
329 * Unregister switch device notifier.
330 */
331int unregister_switchdev_notifier(struct notifier_block *nb)
332{
333 return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
334}
335EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
336
337/**
338 * call_switchdev_notifiers - Call notifiers
339 * @val: value passed unmodified to notifier function
340 * @dev: port device
341 * @info: notifier information data
342 * @extack: netlink extended ack
343 * Call all network notifier blocks.
344 */
345int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
346 struct switchdev_notifier_info *info,
347 struct netlink_ext_ack *extack)
348{
349 info->dev = dev;
350 info->extack = extack;
351 return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
352}
353EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
354
355int register_switchdev_blocking_notifier(struct notifier_block *nb)
356{
357 struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
358
359 return blocking_notifier_chain_register(chain, nb);
360}
361EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier);
362
363int unregister_switchdev_blocking_notifier(struct notifier_block *nb)
364{
365 struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
366
367 return blocking_notifier_chain_unregister(chain, nb);
368}
369EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier);
370
371int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
372 struct switchdev_notifier_info *info,
373 struct netlink_ext_ack *extack)
374{
375 info->dev = dev;
376 info->extack = extack;
377 return blocking_notifier_call_chain(&switchdev_blocking_notif_chain,
378 val, info);
379}
380EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers);
381
382struct switchdev_nested_priv {
383 bool (*check_cb)(const struct net_device *dev);
384 bool (*foreign_dev_check_cb)(const struct net_device *dev,
385 const struct net_device *foreign_dev);
386 const struct net_device *dev;
387 struct net_device *lower_dev;
388};
389
390static int switchdev_lower_dev_walk(struct net_device *lower_dev,
391 struct netdev_nested_priv *priv)
392{
393 struct switchdev_nested_priv *switchdev_priv = priv->data;
394 bool (*foreign_dev_check_cb)(const struct net_device *dev,
395 const struct net_device *foreign_dev);
396 bool (*check_cb)(const struct net_device *dev);
397 const struct net_device *dev;
398
399 check_cb = switchdev_priv->check_cb;
400 foreign_dev_check_cb = switchdev_priv->foreign_dev_check_cb;
401 dev = switchdev_priv->dev;
402
403 if (check_cb(lower_dev) && !foreign_dev_check_cb(lower_dev, dev)) {
404 switchdev_priv->lower_dev = lower_dev;
405 return 1;
406 }
407
408 return 0;
409}
410
411static struct net_device *
412switchdev_lower_dev_find_rcu(struct net_device *dev,
413 bool (*check_cb)(const struct net_device *dev),
414 bool (*foreign_dev_check_cb)(const struct net_device *dev,
415 const struct net_device *foreign_dev))
416{
417 struct switchdev_nested_priv switchdev_priv = {
418 .check_cb = check_cb,
419 .foreign_dev_check_cb = foreign_dev_check_cb,
420 .dev = dev,
421 .lower_dev = NULL,
422 };
423 struct netdev_nested_priv priv = {
424 .data = &switchdev_priv,
425 };
426
427 netdev_walk_all_lower_dev_rcu(dev, switchdev_lower_dev_walk, &priv);
428
429 return switchdev_priv.lower_dev;
430}
431
432static struct net_device *
433switchdev_lower_dev_find(struct net_device *dev,
434 bool (*check_cb)(const struct net_device *dev),
435 bool (*foreign_dev_check_cb)(const struct net_device *dev,
436 const struct net_device *foreign_dev))
437{
438 struct switchdev_nested_priv switchdev_priv = {
439 .check_cb = check_cb,
440 .foreign_dev_check_cb = foreign_dev_check_cb,
441 .dev = dev,
442 .lower_dev = NULL,
443 };
444 struct netdev_nested_priv priv = {
445 .data = &switchdev_priv,
446 };
447
448 netdev_walk_all_lower_dev(dev, switchdev_lower_dev_walk, &priv);
449
450 return switchdev_priv.lower_dev;
451}
452
453static int __switchdev_handle_fdb_event_to_device(struct net_device *dev,
454 struct net_device *orig_dev, unsigned long event,
455 const struct switchdev_notifier_fdb_info *fdb_info,
456 bool (*check_cb)(const struct net_device *dev),
457 bool (*foreign_dev_check_cb)(const struct net_device *dev,
458 const struct net_device *foreign_dev),
459 int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
460 unsigned long event, const void *ctx,
461 const struct switchdev_notifier_fdb_info *fdb_info))
462{
463 const struct switchdev_notifier_info *info = &fdb_info->info;
464 struct net_device *br, *lower_dev, *switchdev;
465 struct list_head *iter;
466 int err = -EOPNOTSUPP;
467
468 if (check_cb(dev))
469 return mod_cb(dev, orig_dev, event, info->ctx, fdb_info);
470
471 /* Recurse through lower interfaces in case the FDB entry is pointing
472 * towards a bridge or a LAG device.
473 */
474 netdev_for_each_lower_dev(dev, lower_dev, iter) {
475 /* Do not propagate FDB entries across bridges */
476 if (netif_is_bridge_master(lower_dev))
477 continue;
478
479 /* Bridge ports might be either us, or LAG interfaces
480 * that we offload.
481 */
482 if (!check_cb(lower_dev) &&
483 !switchdev_lower_dev_find_rcu(lower_dev, check_cb,
484 foreign_dev_check_cb))
485 continue;
486
487 err = __switchdev_handle_fdb_event_to_device(lower_dev, orig_dev,
488 event, fdb_info, check_cb,
489 foreign_dev_check_cb,
490 mod_cb);
491 if (err && err != -EOPNOTSUPP)
492 return err;
493 }
494
495 /* Event is neither on a bridge nor a LAG. Check whether it is on an
496 * interface that is in a bridge with us.
497 */
498 br = netdev_master_upper_dev_get_rcu(dev);
499 if (!br || !netif_is_bridge_master(br))
500 return 0;
501
502 switchdev = switchdev_lower_dev_find_rcu(br, check_cb, foreign_dev_check_cb);
503 if (!switchdev)
504 return 0;
505
506 if (!foreign_dev_check_cb(switchdev, dev))
507 return err;
508
509 return __switchdev_handle_fdb_event_to_device(br, orig_dev, event, fdb_info,
510 check_cb, foreign_dev_check_cb,
511 mod_cb);
512}
513
514int switchdev_handle_fdb_event_to_device(struct net_device *dev, unsigned long event,
515 const struct switchdev_notifier_fdb_info *fdb_info,
516 bool (*check_cb)(const struct net_device *dev),
517 bool (*foreign_dev_check_cb)(const struct net_device *dev,
518 const struct net_device *foreign_dev),
519 int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
520 unsigned long event, const void *ctx,
521 const struct switchdev_notifier_fdb_info *fdb_info))
522{
523 int err;
524
525 err = __switchdev_handle_fdb_event_to_device(dev, dev, event, fdb_info,
526 check_cb, foreign_dev_check_cb,
527 mod_cb);
528 if (err == -EOPNOTSUPP)
529 err = 0;
530
531 return err;
532}
533EXPORT_SYMBOL_GPL(switchdev_handle_fdb_event_to_device);
534
535static int __switchdev_handle_port_obj_add(struct net_device *dev,
536 struct switchdev_notifier_port_obj_info *port_obj_info,
537 bool (*check_cb)(const struct net_device *dev),
538 bool (*foreign_dev_check_cb)(const struct net_device *dev,
539 const struct net_device *foreign_dev),
540 int (*add_cb)(struct net_device *dev, const void *ctx,
541 const struct switchdev_obj *obj,
542 struct netlink_ext_ack *extack))
543{
544 struct switchdev_notifier_info *info = &port_obj_info->info;
545 struct net_device *br, *lower_dev, *switchdev;
546 struct netlink_ext_ack *extack;
547 struct list_head *iter;
548 int err = -EOPNOTSUPP;
549
550 extack = switchdev_notifier_info_to_extack(info);
551
552 if (check_cb(dev)) {
553 err = add_cb(dev, info->ctx, port_obj_info->obj, extack);
554 if (err != -EOPNOTSUPP)
555 port_obj_info->handled = true;
556 return err;
557 }
558
559 /* Switch ports might be stacked under e.g. a LAG. Ignore the
560 * unsupported devices, another driver might be able to handle them. But
561 * propagate to the callers any hard errors.
562 *
563 * If the driver does its own bookkeeping of stacked ports, it's not
564 * necessary to go through this helper.
565 */
566 netdev_for_each_lower_dev(dev, lower_dev, iter) {
567 if (netif_is_bridge_master(lower_dev))
568 continue;
569
570 /* When searching for switchdev interfaces that are neighbors
571 * of foreign ones, and @dev is a bridge, do not recurse on the
572 * foreign interface again, it was already visited.
573 */
574 if (foreign_dev_check_cb && !check_cb(lower_dev) &&
575 !switchdev_lower_dev_find(lower_dev, check_cb, foreign_dev_check_cb))
576 continue;
577
578 err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
579 check_cb, foreign_dev_check_cb,
580 add_cb);
581 if (err && err != -EOPNOTSUPP)
582 return err;
583 }
584
585 /* Event is neither on a bridge nor a LAG. Check whether it is on an
586 * interface that is in a bridge with us.
587 */
588 if (!foreign_dev_check_cb)
589 return err;
590
591 br = netdev_master_upper_dev_get(dev);
592 if (!br || !netif_is_bridge_master(br))
593 return err;
594
595 switchdev = switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb);
596 if (!switchdev)
597 return err;
598
599 if (!foreign_dev_check_cb(switchdev, dev))
600 return err;
601
602 return __switchdev_handle_port_obj_add(br, port_obj_info, check_cb,
603 foreign_dev_check_cb, add_cb);
604}
605
606/* Pass through a port object addition, if @dev passes @check_cb, or replicate
607 * it towards all lower interfaces of @dev that pass @check_cb, if @dev is a
608 * bridge or a LAG.
609 */
610int switchdev_handle_port_obj_add(struct net_device *dev,
611 struct switchdev_notifier_port_obj_info *port_obj_info,
612 bool (*check_cb)(const struct net_device *dev),
613 int (*add_cb)(struct net_device *dev, const void *ctx,
614 const struct switchdev_obj *obj,
615 struct netlink_ext_ack *extack))
616{
617 int err;
618
619 err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
620 NULL, add_cb);
621 if (err == -EOPNOTSUPP)
622 err = 0;
623 return err;
624}
625EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
626
627/* Same as switchdev_handle_port_obj_add(), except if object is notified on a
628 * @dev that passes @foreign_dev_check_cb, it is replicated towards all devices
629 * that pass @check_cb and are in the same bridge as @dev.
630 */
631int switchdev_handle_port_obj_add_foreign(struct net_device *dev,
632 struct switchdev_notifier_port_obj_info *port_obj_info,
633 bool (*check_cb)(const struct net_device *dev),
634 bool (*foreign_dev_check_cb)(const struct net_device *dev,
635 const struct net_device *foreign_dev),
636 int (*add_cb)(struct net_device *dev, const void *ctx,
637 const struct switchdev_obj *obj,
638 struct netlink_ext_ack *extack))
639{
640 int err;
641
642 err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
643 foreign_dev_check_cb, add_cb);
644 if (err == -EOPNOTSUPP)
645 err = 0;
646 return err;
647}
648EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add_foreign);
649
650static int __switchdev_handle_port_obj_del(struct net_device *dev,
651 struct switchdev_notifier_port_obj_info *port_obj_info,
652 bool (*check_cb)(const struct net_device *dev),
653 bool (*foreign_dev_check_cb)(const struct net_device *dev,
654 const struct net_device *foreign_dev),
655 int (*del_cb)(struct net_device *dev, const void *ctx,
656 const struct switchdev_obj *obj))
657{
658 struct switchdev_notifier_info *info = &port_obj_info->info;
659 struct net_device *br, *lower_dev, *switchdev;
660 struct list_head *iter;
661 int err = -EOPNOTSUPP;
662
663 if (check_cb(dev)) {
664 err = del_cb(dev, info->ctx, port_obj_info->obj);
665 if (err != -EOPNOTSUPP)
666 port_obj_info->handled = true;
667 return err;
668 }
669
670 /* Switch ports might be stacked under e.g. a LAG. Ignore the
671 * unsupported devices, another driver might be able to handle them. But
672 * propagate to the callers any hard errors.
673 *
674 * If the driver does its own bookkeeping of stacked ports, it's not
675 * necessary to go through this helper.
676 */
677 netdev_for_each_lower_dev(dev, lower_dev, iter) {
678 if (netif_is_bridge_master(lower_dev))
679 continue;
680
681 /* When searching for switchdev interfaces that are neighbors
682 * of foreign ones, and @dev is a bridge, do not recurse on the
683 * foreign interface again, it was already visited.
684 */
685 if (foreign_dev_check_cb && !check_cb(lower_dev) &&
686 !switchdev_lower_dev_find(lower_dev, check_cb, foreign_dev_check_cb))
687 continue;
688
689 err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
690 check_cb, foreign_dev_check_cb,
691 del_cb);
692 if (err && err != -EOPNOTSUPP)
693 return err;
694 }
695
696 /* Event is neither on a bridge nor a LAG. Check whether it is on an
697 * interface that is in a bridge with us.
698 */
699 if (!foreign_dev_check_cb)
700 return err;
701
702 br = netdev_master_upper_dev_get(dev);
703 if (!br || !netif_is_bridge_master(br))
704 return err;
705
706 switchdev = switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb);
707 if (!switchdev)
708 return err;
709
710 if (!foreign_dev_check_cb(switchdev, dev))
711 return err;
712
713 return __switchdev_handle_port_obj_del(br, port_obj_info, check_cb,
714 foreign_dev_check_cb, del_cb);
715}
716
717/* Pass through a port object deletion, if @dev passes @check_cb, or replicate
718 * it towards all lower interfaces of @dev that pass @check_cb, if @dev is a
719 * bridge or a LAG.
720 */
721int switchdev_handle_port_obj_del(struct net_device *dev,
722 struct switchdev_notifier_port_obj_info *port_obj_info,
723 bool (*check_cb)(const struct net_device *dev),
724 int (*del_cb)(struct net_device *dev, const void *ctx,
725 const struct switchdev_obj *obj))
726{
727 int err;
728
729 err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
730 NULL, del_cb);
731 if (err == -EOPNOTSUPP)
732 err = 0;
733 return err;
734}
735EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
736
737/* Same as switchdev_handle_port_obj_del(), except if object is notified on a
738 * @dev that passes @foreign_dev_check_cb, it is replicated towards all devices
739 * that pass @check_cb and are in the same bridge as @dev.
740 */
741int switchdev_handle_port_obj_del_foreign(struct net_device *dev,
742 struct switchdev_notifier_port_obj_info *port_obj_info,
743 bool (*check_cb)(const struct net_device *dev),
744 bool (*foreign_dev_check_cb)(const struct net_device *dev,
745 const struct net_device *foreign_dev),
746 int (*del_cb)(struct net_device *dev, const void *ctx,
747 const struct switchdev_obj *obj))
748{
749 int err;
750
751 err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
752 foreign_dev_check_cb, del_cb);
753 if (err == -EOPNOTSUPP)
754 err = 0;
755 return err;
756}
757EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del_foreign);
758
759static int __switchdev_handle_port_attr_set(struct net_device *dev,
760 struct switchdev_notifier_port_attr_info *port_attr_info,
761 bool (*check_cb)(const struct net_device *dev),
762 int (*set_cb)(struct net_device *dev, const void *ctx,
763 const struct switchdev_attr *attr,
764 struct netlink_ext_ack *extack))
765{
766 struct switchdev_notifier_info *info = &port_attr_info->info;
767 struct netlink_ext_ack *extack;
768 struct net_device *lower_dev;
769 struct list_head *iter;
770 int err = -EOPNOTSUPP;
771
772 extack = switchdev_notifier_info_to_extack(info);
773
774 if (check_cb(dev)) {
775 err = set_cb(dev, info->ctx, port_attr_info->attr, extack);
776 if (err != -EOPNOTSUPP)
777 port_attr_info->handled = true;
778 return err;
779 }
780
781 /* Switch ports might be stacked under e.g. a LAG. Ignore the
782 * unsupported devices, another driver might be able to handle them. But
783 * propagate to the callers any hard errors.
784 *
785 * If the driver does its own bookkeeping of stacked ports, it's not
786 * necessary to go through this helper.
787 */
788 netdev_for_each_lower_dev(dev, lower_dev, iter) {
789 if (netif_is_bridge_master(lower_dev))
790 continue;
791
792 err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
793 check_cb, set_cb);
794 if (err && err != -EOPNOTSUPP)
795 return err;
796 }
797
798 return err;
799}
800
801int switchdev_handle_port_attr_set(struct net_device *dev,
802 struct switchdev_notifier_port_attr_info *port_attr_info,
803 bool (*check_cb)(const struct net_device *dev),
804 int (*set_cb)(struct net_device *dev, const void *ctx,
805 const struct switchdev_attr *attr,
806 struct netlink_ext_ack *extack))
807{
808 int err;
809
810 err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb,
811 set_cb);
812 if (err == -EOPNOTSUPP)
813 err = 0;
814 return err;
815}
816EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set);
817
818int switchdev_bridge_port_offload(struct net_device *brport_dev,
819 struct net_device *dev, const void *ctx,
820 struct notifier_block *atomic_nb,
821 struct notifier_block *blocking_nb,
822 bool tx_fwd_offload,
823 struct netlink_ext_ack *extack)
824{
825 struct switchdev_notifier_brport_info brport_info = {
826 .brport = {
827 .dev = dev,
828 .ctx = ctx,
829 .atomic_nb = atomic_nb,
830 .blocking_nb = blocking_nb,
831 .tx_fwd_offload = tx_fwd_offload,
832 },
833 };
834 int err;
835
836 ASSERT_RTNL();
837
838 err = call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_OFFLOADED,
839 brport_dev, &brport_info.info,
840 extack);
841 return notifier_to_errno(err);
842}
843EXPORT_SYMBOL_GPL(switchdev_bridge_port_offload);
844
845void switchdev_bridge_port_unoffload(struct net_device *brport_dev,
846 const void *ctx,
847 struct notifier_block *atomic_nb,
848 struct notifier_block *blocking_nb)
849{
850 struct switchdev_notifier_brport_info brport_info = {
851 .brport = {
852 .ctx = ctx,
853 .atomic_nb = atomic_nb,
854 .blocking_nb = blocking_nb,
855 },
856 };
857
858 ASSERT_RTNL();
859
860 call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_UNOFFLOADED,
861 brport_dev, &brport_info.info,
862 NULL);
863}
864EXPORT_SYMBOL_GPL(switchdev_bridge_port_unoffload);