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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 bool switchdev_obj_eq(const struct switchdev_obj *a,
23 const struct switchdev_obj *b)
24{
25 const struct switchdev_obj_port_vlan *va, *vb;
26 const struct switchdev_obj_port_mdb *ma, *mb;
27
28 if (a->id != b->id || a->orig_dev != b->orig_dev)
29 return false;
30
31 switch (a->id) {
32 case SWITCHDEV_OBJ_ID_PORT_VLAN:
33 va = SWITCHDEV_OBJ_PORT_VLAN(a);
34 vb = SWITCHDEV_OBJ_PORT_VLAN(b);
35 return va->flags == vb->flags &&
36 va->vid == vb->vid &&
37 va->changed == vb->changed;
38 case SWITCHDEV_OBJ_ID_PORT_MDB:
39 case SWITCHDEV_OBJ_ID_HOST_MDB:
40 ma = SWITCHDEV_OBJ_PORT_MDB(a);
41 mb = SWITCHDEV_OBJ_PORT_MDB(b);
42 return ma->vid == mb->vid &&
43 ether_addr_equal(ma->addr, mb->addr);
44 default:
45 break;
46 }
47
48 BUG();
49}
50
51static LIST_HEAD(deferred);
52static DEFINE_SPINLOCK(deferred_lock);
53
54typedef void switchdev_deferred_func_t(struct net_device *dev,
55 const void *data);
56
57struct switchdev_deferred_item {
58 struct list_head list;
59 struct net_device *dev;
60 netdevice_tracker dev_tracker;
61 switchdev_deferred_func_t *func;
62 unsigned long data[];
63};
64
65static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
66{
67 struct switchdev_deferred_item *dfitem;
68
69 spin_lock_bh(&deferred_lock);
70 if (list_empty(&deferred)) {
71 dfitem = NULL;
72 goto unlock;
73 }
74 dfitem = list_first_entry(&deferred,
75 struct switchdev_deferred_item, list);
76 list_del(&dfitem->list);
77unlock:
78 spin_unlock_bh(&deferred_lock);
79 return dfitem;
80}
81
82/**
83 * switchdev_deferred_process - Process ops in deferred queue
84 *
85 * Called to flush the ops currently queued in deferred ops queue.
86 * rtnl_lock must be held.
87 */
88void switchdev_deferred_process(void)
89{
90 struct switchdev_deferred_item *dfitem;
91
92 ASSERT_RTNL();
93
94 while ((dfitem = switchdev_deferred_dequeue())) {
95 dfitem->func(dfitem->dev, dfitem->data);
96 netdev_put(dfitem->dev, &dfitem->dev_tracker);
97 kfree(dfitem);
98 }
99}
100EXPORT_SYMBOL_GPL(switchdev_deferred_process);
101
102static void switchdev_deferred_process_work(struct work_struct *work)
103{
104 rtnl_lock();
105 switchdev_deferred_process();
106 rtnl_unlock();
107}
108
109static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
110
111static int switchdev_deferred_enqueue(struct net_device *dev,
112 const void *data, size_t data_len,
113 switchdev_deferred_func_t *func)
114{
115 struct switchdev_deferred_item *dfitem;
116
117 dfitem = kmalloc(struct_size(dfitem, data, data_len), GFP_ATOMIC);
118 if (!dfitem)
119 return -ENOMEM;
120 dfitem->dev = dev;
121 dfitem->func = func;
122 memcpy(dfitem->data, data, data_len);
123 netdev_hold(dev, &dfitem->dev_tracker, GFP_ATOMIC);
124 spin_lock_bh(&deferred_lock);
125 list_add_tail(&dfitem->list, &deferred);
126 spin_unlock_bh(&deferred_lock);
127 schedule_work(&deferred_process_work);
128 return 0;
129}
130
131static int switchdev_port_attr_notify(enum switchdev_notifier_type nt,
132 struct net_device *dev,
133 const struct switchdev_attr *attr,
134 struct netlink_ext_ack *extack)
135{
136 int err;
137 int rc;
138
139 struct switchdev_notifier_port_attr_info attr_info = {
140 .attr = attr,
141 .handled = false,
142 };
143
144 rc = call_switchdev_blocking_notifiers(nt, dev,
145 &attr_info.info, extack);
146 err = notifier_to_errno(rc);
147 if (err) {
148 WARN_ON(!attr_info.handled);
149 return err;
150 }
151
152 if (!attr_info.handled)
153 return -EOPNOTSUPP;
154
155 return 0;
156}
157
158static int switchdev_port_attr_set_now(struct net_device *dev,
159 const struct switchdev_attr *attr,
160 struct netlink_ext_ack *extack)
161{
162 return switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
163 extack);
164}
165
166static void switchdev_port_attr_set_deferred(struct net_device *dev,
167 const void *data)
168{
169 const struct switchdev_attr *attr = data;
170 int err;
171
172 err = switchdev_port_attr_set_now(dev, attr, NULL);
173 if (err && err != -EOPNOTSUPP)
174 netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
175 err, attr->id);
176 if (attr->complete)
177 attr->complete(dev, err, attr->complete_priv);
178}
179
180static int switchdev_port_attr_set_defer(struct net_device *dev,
181 const struct switchdev_attr *attr)
182{
183 return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
184 switchdev_port_attr_set_deferred);
185}
186
187/**
188 * switchdev_port_attr_set - Set port attribute
189 *
190 * @dev: port device
191 * @attr: attribute to set
192 * @extack: netlink extended ack, for error message propagation
193 *
194 * rtnl_lock must be held and must not be in atomic section,
195 * in case SWITCHDEV_F_DEFER flag is not set.
196 */
197int switchdev_port_attr_set(struct net_device *dev,
198 const struct switchdev_attr *attr,
199 struct netlink_ext_ack *extack)
200{
201 if (attr->flags & SWITCHDEV_F_DEFER)
202 return switchdev_port_attr_set_defer(dev, attr);
203 ASSERT_RTNL();
204 return switchdev_port_attr_set_now(dev, attr, extack);
205}
206EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
207
208static size_t switchdev_obj_size(const struct switchdev_obj *obj)
209{
210 switch (obj->id) {
211 case SWITCHDEV_OBJ_ID_PORT_VLAN:
212 return sizeof(struct switchdev_obj_port_vlan);
213 case SWITCHDEV_OBJ_ID_PORT_MDB:
214 return sizeof(struct switchdev_obj_port_mdb);
215 case SWITCHDEV_OBJ_ID_HOST_MDB:
216 return sizeof(struct switchdev_obj_port_mdb);
217 default:
218 BUG();
219 }
220 return 0;
221}
222
223static int switchdev_port_obj_notify(enum switchdev_notifier_type nt,
224 struct net_device *dev,
225 const struct switchdev_obj *obj,
226 struct netlink_ext_ack *extack)
227{
228 int rc;
229 int err;
230
231 struct switchdev_notifier_port_obj_info obj_info = {
232 .obj = obj,
233 .handled = false,
234 };
235
236 rc = call_switchdev_blocking_notifiers(nt, dev, &obj_info.info, extack);
237 err = notifier_to_errno(rc);
238 if (err) {
239 WARN_ON(!obj_info.handled);
240 return err;
241 }
242 if (!obj_info.handled)
243 return -EOPNOTSUPP;
244 return 0;
245}
246
247static void switchdev_port_obj_add_deferred(struct net_device *dev,
248 const void *data)
249{
250 const struct switchdev_obj *obj = data;
251 int err;
252
253 ASSERT_RTNL();
254 err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
255 dev, obj, NULL);
256 if (err && err != -EOPNOTSUPP)
257 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
258 err, obj->id);
259 if (obj->complete)
260 obj->complete(dev, err, obj->complete_priv);
261}
262
263static int switchdev_port_obj_add_defer(struct net_device *dev,
264 const struct switchdev_obj *obj)
265{
266 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
267 switchdev_port_obj_add_deferred);
268}
269
270/**
271 * switchdev_port_obj_add - Add port object
272 *
273 * @dev: port device
274 * @obj: object to add
275 * @extack: netlink extended ack
276 *
277 * rtnl_lock must be held and must not be in atomic section,
278 * in case SWITCHDEV_F_DEFER flag is not set.
279 */
280int switchdev_port_obj_add(struct net_device *dev,
281 const struct switchdev_obj *obj,
282 struct netlink_ext_ack *extack)
283{
284 if (obj->flags & SWITCHDEV_F_DEFER)
285 return switchdev_port_obj_add_defer(dev, obj);
286 ASSERT_RTNL();
287 return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
288 dev, obj, extack);
289}
290EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
291
292static int switchdev_port_obj_del_now(struct net_device *dev,
293 const struct switchdev_obj *obj)
294{
295 return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_DEL,
296 dev, obj, NULL);
297}
298
299static void switchdev_port_obj_del_deferred(struct net_device *dev,
300 const void *data)
301{
302 const struct switchdev_obj *obj = data;
303 int err;
304
305 err = switchdev_port_obj_del_now(dev, obj);
306 if (err && err != -EOPNOTSUPP)
307 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
308 err, obj->id);
309 if (obj->complete)
310 obj->complete(dev, err, obj->complete_priv);
311}
312
313static int switchdev_port_obj_del_defer(struct net_device *dev,
314 const struct switchdev_obj *obj)
315{
316 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
317 switchdev_port_obj_del_deferred);
318}
319
320/**
321 * switchdev_port_obj_del - Delete port object
322 *
323 * @dev: port device
324 * @obj: object to delete
325 *
326 * rtnl_lock must be held and must not be in atomic section,
327 * in case SWITCHDEV_F_DEFER flag is not set.
328 */
329int switchdev_port_obj_del(struct net_device *dev,
330 const struct switchdev_obj *obj)
331{
332 if (obj->flags & SWITCHDEV_F_DEFER)
333 return switchdev_port_obj_del_defer(dev, obj);
334 ASSERT_RTNL();
335 return switchdev_port_obj_del_now(dev, obj);
336}
337EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
338
339/**
340 * switchdev_port_obj_act_is_deferred - Is object action pending?
341 *
342 * @dev: port device
343 * @nt: type of action; add or delete
344 * @obj: object to test
345 *
346 * Returns true if a deferred item is pending, which is
347 * equivalent to the action @nt on an object @obj.
348 *
349 * rtnl_lock must be held.
350 */
351bool switchdev_port_obj_act_is_deferred(struct net_device *dev,
352 enum switchdev_notifier_type nt,
353 const struct switchdev_obj *obj)
354{
355 struct switchdev_deferred_item *dfitem;
356 bool found = false;
357
358 ASSERT_RTNL();
359
360 spin_lock_bh(&deferred_lock);
361
362 list_for_each_entry(dfitem, &deferred, list) {
363 if (dfitem->dev != dev)
364 continue;
365
366 if ((dfitem->func == switchdev_port_obj_add_deferred &&
367 nt == SWITCHDEV_PORT_OBJ_ADD) ||
368 (dfitem->func == switchdev_port_obj_del_deferred &&
369 nt == SWITCHDEV_PORT_OBJ_DEL)) {
370 if (switchdev_obj_eq((const void *)dfitem->data, obj)) {
371 found = true;
372 break;
373 }
374 }
375 }
376
377 spin_unlock_bh(&deferred_lock);
378
379 return found;
380}
381EXPORT_SYMBOL_GPL(switchdev_port_obj_act_is_deferred);
382
383static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
384static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain);
385
386/**
387 * register_switchdev_notifier - Register notifier
388 * @nb: notifier_block
389 *
390 * Register switch device notifier.
391 */
392int register_switchdev_notifier(struct notifier_block *nb)
393{
394 return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
395}
396EXPORT_SYMBOL_GPL(register_switchdev_notifier);
397
398/**
399 * unregister_switchdev_notifier - Unregister notifier
400 * @nb: notifier_block
401 *
402 * Unregister switch device notifier.
403 */
404int unregister_switchdev_notifier(struct notifier_block *nb)
405{
406 return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
407}
408EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
409
410/**
411 * call_switchdev_notifiers - Call notifiers
412 * @val: value passed unmodified to notifier function
413 * @dev: port device
414 * @info: notifier information data
415 * @extack: netlink extended ack
416 * Call all network notifier blocks.
417 */
418int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
419 struct switchdev_notifier_info *info,
420 struct netlink_ext_ack *extack)
421{
422 info->dev = dev;
423 info->extack = extack;
424 return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
425}
426EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
427
428int register_switchdev_blocking_notifier(struct notifier_block *nb)
429{
430 struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
431
432 return blocking_notifier_chain_register(chain, nb);
433}
434EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier);
435
436int unregister_switchdev_blocking_notifier(struct notifier_block *nb)
437{
438 struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
439
440 return blocking_notifier_chain_unregister(chain, nb);
441}
442EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier);
443
444int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
445 struct switchdev_notifier_info *info,
446 struct netlink_ext_ack *extack)
447{
448 info->dev = dev;
449 info->extack = extack;
450 return blocking_notifier_call_chain(&switchdev_blocking_notif_chain,
451 val, info);
452}
453EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers);
454
455struct switchdev_nested_priv {
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 const struct net_device *dev;
460 struct net_device *lower_dev;
461};
462
463static int switchdev_lower_dev_walk(struct net_device *lower_dev,
464 struct netdev_nested_priv *priv)
465{
466 struct switchdev_nested_priv *switchdev_priv = priv->data;
467 bool (*foreign_dev_check_cb)(const struct net_device *dev,
468 const struct net_device *foreign_dev);
469 bool (*check_cb)(const struct net_device *dev);
470 const struct net_device *dev;
471
472 check_cb = switchdev_priv->check_cb;
473 foreign_dev_check_cb = switchdev_priv->foreign_dev_check_cb;
474 dev = switchdev_priv->dev;
475
476 if (check_cb(lower_dev) && !foreign_dev_check_cb(lower_dev, dev)) {
477 switchdev_priv->lower_dev = lower_dev;
478 return 1;
479 }
480
481 return 0;
482}
483
484static struct net_device *
485switchdev_lower_dev_find_rcu(struct net_device *dev,
486 bool (*check_cb)(const struct net_device *dev),
487 bool (*foreign_dev_check_cb)(const struct net_device *dev,
488 const struct net_device *foreign_dev))
489{
490 struct switchdev_nested_priv switchdev_priv = {
491 .check_cb = check_cb,
492 .foreign_dev_check_cb = foreign_dev_check_cb,
493 .dev = dev,
494 .lower_dev = NULL,
495 };
496 struct netdev_nested_priv priv = {
497 .data = &switchdev_priv,
498 };
499
500 netdev_walk_all_lower_dev_rcu(dev, switchdev_lower_dev_walk, &priv);
501
502 return switchdev_priv.lower_dev;
503}
504
505static struct net_device *
506switchdev_lower_dev_find(struct net_device *dev,
507 bool (*check_cb)(const struct net_device *dev),
508 bool (*foreign_dev_check_cb)(const struct net_device *dev,
509 const struct net_device *foreign_dev))
510{
511 struct switchdev_nested_priv switchdev_priv = {
512 .check_cb = check_cb,
513 .foreign_dev_check_cb = foreign_dev_check_cb,
514 .dev = dev,
515 .lower_dev = NULL,
516 };
517 struct netdev_nested_priv priv = {
518 .data = &switchdev_priv,
519 };
520
521 netdev_walk_all_lower_dev(dev, switchdev_lower_dev_walk, &priv);
522
523 return switchdev_priv.lower_dev;
524}
525
526static int __switchdev_handle_fdb_event_to_device(struct net_device *dev,
527 struct net_device *orig_dev, unsigned long event,
528 const struct switchdev_notifier_fdb_info *fdb_info,
529 bool (*check_cb)(const struct net_device *dev),
530 bool (*foreign_dev_check_cb)(const struct net_device *dev,
531 const struct net_device *foreign_dev),
532 int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
533 unsigned long event, const void *ctx,
534 const struct switchdev_notifier_fdb_info *fdb_info))
535{
536 const struct switchdev_notifier_info *info = &fdb_info->info;
537 struct net_device *br, *lower_dev, *switchdev;
538 struct list_head *iter;
539 int err = -EOPNOTSUPP;
540
541 if (check_cb(dev))
542 return mod_cb(dev, orig_dev, event, info->ctx, fdb_info);
543
544 /* Recurse through lower interfaces in case the FDB entry is pointing
545 * towards a bridge or a LAG device.
546 */
547 netdev_for_each_lower_dev(dev, lower_dev, iter) {
548 /* Do not propagate FDB entries across bridges */
549 if (netif_is_bridge_master(lower_dev))
550 continue;
551
552 /* Bridge ports might be either us, or LAG interfaces
553 * that we offload.
554 */
555 if (!check_cb(lower_dev) &&
556 !switchdev_lower_dev_find_rcu(lower_dev, check_cb,
557 foreign_dev_check_cb))
558 continue;
559
560 err = __switchdev_handle_fdb_event_to_device(lower_dev, orig_dev,
561 event, fdb_info, check_cb,
562 foreign_dev_check_cb,
563 mod_cb);
564 if (err && err != -EOPNOTSUPP)
565 return err;
566 }
567
568 /* Event is neither on a bridge nor a LAG. Check whether it is on an
569 * interface that is in a bridge with us.
570 */
571 br = netdev_master_upper_dev_get_rcu(dev);
572 if (!br || !netif_is_bridge_master(br))
573 return 0;
574
575 switchdev = switchdev_lower_dev_find_rcu(br, check_cb, foreign_dev_check_cb);
576 if (!switchdev)
577 return 0;
578
579 if (!foreign_dev_check_cb(switchdev, dev))
580 return err;
581
582 return __switchdev_handle_fdb_event_to_device(br, orig_dev, event, fdb_info,
583 check_cb, foreign_dev_check_cb,
584 mod_cb);
585}
586
587int switchdev_handle_fdb_event_to_device(struct net_device *dev, unsigned long event,
588 const struct switchdev_notifier_fdb_info *fdb_info,
589 bool (*check_cb)(const struct net_device *dev),
590 bool (*foreign_dev_check_cb)(const struct net_device *dev,
591 const struct net_device *foreign_dev),
592 int (*mod_cb)(struct net_device *dev, struct net_device *orig_dev,
593 unsigned long event, const void *ctx,
594 const struct switchdev_notifier_fdb_info *fdb_info))
595{
596 int err;
597
598 err = __switchdev_handle_fdb_event_to_device(dev, dev, event, fdb_info,
599 check_cb, foreign_dev_check_cb,
600 mod_cb);
601 if (err == -EOPNOTSUPP)
602 err = 0;
603
604 return err;
605}
606EXPORT_SYMBOL_GPL(switchdev_handle_fdb_event_to_device);
607
608static int __switchdev_handle_port_obj_add(struct net_device *dev,
609 struct switchdev_notifier_port_obj_info *port_obj_info,
610 bool (*check_cb)(const struct net_device *dev),
611 bool (*foreign_dev_check_cb)(const struct net_device *dev,
612 const struct net_device *foreign_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 struct switchdev_notifier_info *info = &port_obj_info->info;
618 struct net_device *br, *lower_dev, *switchdev;
619 struct netlink_ext_ack *extack;
620 struct list_head *iter;
621 int err = -EOPNOTSUPP;
622
623 extack = switchdev_notifier_info_to_extack(info);
624
625 if (check_cb(dev)) {
626 err = add_cb(dev, info->ctx, port_obj_info->obj, extack);
627 if (err != -EOPNOTSUPP)
628 port_obj_info->handled = true;
629 return err;
630 }
631
632 /* Switch ports might be stacked under e.g. a LAG. Ignore the
633 * unsupported devices, another driver might be able to handle them. But
634 * propagate to the callers any hard errors.
635 *
636 * If the driver does its own bookkeeping of stacked ports, it's not
637 * necessary to go through this helper.
638 */
639 netdev_for_each_lower_dev(dev, lower_dev, iter) {
640 if (netif_is_bridge_master(lower_dev))
641 continue;
642
643 /* When searching for switchdev interfaces that are neighbors
644 * of foreign ones, and @dev is a bridge, do not recurse on the
645 * foreign interface again, it was already visited.
646 */
647 if (foreign_dev_check_cb && !check_cb(lower_dev) &&
648 !switchdev_lower_dev_find(lower_dev, check_cb, foreign_dev_check_cb))
649 continue;
650
651 err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
652 check_cb, foreign_dev_check_cb,
653 add_cb);
654 if (err && err != -EOPNOTSUPP)
655 return err;
656 }
657
658 /* Event is neither on a bridge nor a LAG. Check whether it is on an
659 * interface that is in a bridge with us.
660 */
661 if (!foreign_dev_check_cb)
662 return err;
663
664 br = netdev_master_upper_dev_get(dev);
665 if (!br || !netif_is_bridge_master(br))
666 return err;
667
668 switchdev = switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb);
669 if (!switchdev)
670 return err;
671
672 if (!foreign_dev_check_cb(switchdev, dev))
673 return err;
674
675 return __switchdev_handle_port_obj_add(br, port_obj_info, check_cb,
676 foreign_dev_check_cb, add_cb);
677}
678
679/* Pass through a port object addition, if @dev passes @check_cb, or replicate
680 * it towards all lower interfaces of @dev that pass @check_cb, if @dev is a
681 * bridge or a LAG.
682 */
683int switchdev_handle_port_obj_add(struct net_device *dev,
684 struct switchdev_notifier_port_obj_info *port_obj_info,
685 bool (*check_cb)(const struct net_device *dev),
686 int (*add_cb)(struct net_device *dev, const void *ctx,
687 const struct switchdev_obj *obj,
688 struct netlink_ext_ack *extack))
689{
690 int err;
691
692 err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
693 NULL, add_cb);
694 if (err == -EOPNOTSUPP)
695 err = 0;
696 return err;
697}
698EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
699
700/* Same as switchdev_handle_port_obj_add(), except if object is notified on a
701 * @dev that passes @foreign_dev_check_cb, it is replicated towards all devices
702 * that pass @check_cb and are in the same bridge as @dev.
703 */
704int switchdev_handle_port_obj_add_foreign(struct net_device *dev,
705 struct switchdev_notifier_port_obj_info *port_obj_info,
706 bool (*check_cb)(const struct net_device *dev),
707 bool (*foreign_dev_check_cb)(const struct net_device *dev,
708 const struct net_device *foreign_dev),
709 int (*add_cb)(struct net_device *dev, const void *ctx,
710 const struct switchdev_obj *obj,
711 struct netlink_ext_ack *extack))
712{
713 int err;
714
715 err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
716 foreign_dev_check_cb, add_cb);
717 if (err == -EOPNOTSUPP)
718 err = 0;
719 return err;
720}
721EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add_foreign);
722
723static int __switchdev_handle_port_obj_del(struct net_device *dev,
724 struct switchdev_notifier_port_obj_info *port_obj_info,
725 bool (*check_cb)(const struct net_device *dev),
726 bool (*foreign_dev_check_cb)(const struct net_device *dev,
727 const struct net_device *foreign_dev),
728 int (*del_cb)(struct net_device *dev, const void *ctx,
729 const struct switchdev_obj *obj))
730{
731 struct switchdev_notifier_info *info = &port_obj_info->info;
732 struct net_device *br, *lower_dev, *switchdev;
733 struct list_head *iter;
734 int err = -EOPNOTSUPP;
735
736 if (check_cb(dev)) {
737 err = del_cb(dev, info->ctx, port_obj_info->obj);
738 if (err != -EOPNOTSUPP)
739 port_obj_info->handled = true;
740 return err;
741 }
742
743 /* Switch ports might be stacked under e.g. a LAG. Ignore the
744 * unsupported devices, another driver might be able to handle them. But
745 * propagate to the callers any hard errors.
746 *
747 * If the driver does its own bookkeeping of stacked ports, it's not
748 * necessary to go through this helper.
749 */
750 netdev_for_each_lower_dev(dev, lower_dev, iter) {
751 if (netif_is_bridge_master(lower_dev))
752 continue;
753
754 /* When searching for switchdev interfaces that are neighbors
755 * of foreign ones, and @dev is a bridge, do not recurse on the
756 * foreign interface again, it was already visited.
757 */
758 if (foreign_dev_check_cb && !check_cb(lower_dev) &&
759 !switchdev_lower_dev_find(lower_dev, check_cb, foreign_dev_check_cb))
760 continue;
761
762 err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
763 check_cb, foreign_dev_check_cb,
764 del_cb);
765 if (err && err != -EOPNOTSUPP)
766 return err;
767 }
768
769 /* Event is neither on a bridge nor a LAG. Check whether it is on an
770 * interface that is in a bridge with us.
771 */
772 if (!foreign_dev_check_cb)
773 return err;
774
775 br = netdev_master_upper_dev_get(dev);
776 if (!br || !netif_is_bridge_master(br))
777 return err;
778
779 switchdev = switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb);
780 if (!switchdev)
781 return err;
782
783 if (!foreign_dev_check_cb(switchdev, dev))
784 return err;
785
786 return __switchdev_handle_port_obj_del(br, port_obj_info, check_cb,
787 foreign_dev_check_cb, del_cb);
788}
789
790/* Pass through a port object deletion, if @dev passes @check_cb, or replicate
791 * it towards all lower interfaces of @dev that pass @check_cb, if @dev is a
792 * bridge or a LAG.
793 */
794int switchdev_handle_port_obj_del(struct net_device *dev,
795 struct switchdev_notifier_port_obj_info *port_obj_info,
796 bool (*check_cb)(const struct net_device *dev),
797 int (*del_cb)(struct net_device *dev, const void *ctx,
798 const struct switchdev_obj *obj))
799{
800 int err;
801
802 err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
803 NULL, del_cb);
804 if (err == -EOPNOTSUPP)
805 err = 0;
806 return err;
807}
808EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
809
810/* Same as switchdev_handle_port_obj_del(), except if object is notified on a
811 * @dev that passes @foreign_dev_check_cb, it is replicated towards all devices
812 * that pass @check_cb and are in the same bridge as @dev.
813 */
814int switchdev_handle_port_obj_del_foreign(struct net_device *dev,
815 struct switchdev_notifier_port_obj_info *port_obj_info,
816 bool (*check_cb)(const struct net_device *dev),
817 bool (*foreign_dev_check_cb)(const struct net_device *dev,
818 const struct net_device *foreign_dev),
819 int (*del_cb)(struct net_device *dev, const void *ctx,
820 const struct switchdev_obj *obj))
821{
822 int err;
823
824 err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
825 foreign_dev_check_cb, del_cb);
826 if (err == -EOPNOTSUPP)
827 err = 0;
828 return err;
829}
830EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del_foreign);
831
832static int __switchdev_handle_port_attr_set(struct net_device *dev,
833 struct switchdev_notifier_port_attr_info *port_attr_info,
834 bool (*check_cb)(const struct net_device *dev),
835 int (*set_cb)(struct net_device *dev, const void *ctx,
836 const struct switchdev_attr *attr,
837 struct netlink_ext_ack *extack))
838{
839 struct switchdev_notifier_info *info = &port_attr_info->info;
840 struct netlink_ext_ack *extack;
841 struct net_device *lower_dev;
842 struct list_head *iter;
843 int err = -EOPNOTSUPP;
844
845 extack = switchdev_notifier_info_to_extack(info);
846
847 if (check_cb(dev)) {
848 err = set_cb(dev, info->ctx, port_attr_info->attr, extack);
849 if (err != -EOPNOTSUPP)
850 port_attr_info->handled = true;
851 return err;
852 }
853
854 /* Switch ports might be stacked under e.g. a LAG. Ignore the
855 * unsupported devices, another driver might be able to handle them. But
856 * propagate to the callers any hard errors.
857 *
858 * If the driver does its own bookkeeping of stacked ports, it's not
859 * necessary to go through this helper.
860 */
861 netdev_for_each_lower_dev(dev, lower_dev, iter) {
862 if (netif_is_bridge_master(lower_dev))
863 continue;
864
865 err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
866 check_cb, set_cb);
867 if (err && err != -EOPNOTSUPP)
868 return err;
869 }
870
871 return err;
872}
873
874int switchdev_handle_port_attr_set(struct net_device *dev,
875 struct switchdev_notifier_port_attr_info *port_attr_info,
876 bool (*check_cb)(const struct net_device *dev),
877 int (*set_cb)(struct net_device *dev, const void *ctx,
878 const struct switchdev_attr *attr,
879 struct netlink_ext_ack *extack))
880{
881 int err;
882
883 err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb,
884 set_cb);
885 if (err == -EOPNOTSUPP)
886 err = 0;
887 return err;
888}
889EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set);
890
891int switchdev_bridge_port_offload(struct net_device *brport_dev,
892 struct net_device *dev, const void *ctx,
893 struct notifier_block *atomic_nb,
894 struct notifier_block *blocking_nb,
895 bool tx_fwd_offload,
896 struct netlink_ext_ack *extack)
897{
898 struct switchdev_notifier_brport_info brport_info = {
899 .brport = {
900 .dev = dev,
901 .ctx = ctx,
902 .atomic_nb = atomic_nb,
903 .blocking_nb = blocking_nb,
904 .tx_fwd_offload = tx_fwd_offload,
905 },
906 };
907 int err;
908
909 ASSERT_RTNL();
910
911 err = call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_OFFLOADED,
912 brport_dev, &brport_info.info,
913 extack);
914 return notifier_to_errno(err);
915}
916EXPORT_SYMBOL_GPL(switchdev_bridge_port_offload);
917
918void switchdev_bridge_port_unoffload(struct net_device *brport_dev,
919 const void *ctx,
920 struct notifier_block *atomic_nb,
921 struct notifier_block *blocking_nb)
922{
923 struct switchdev_notifier_brport_info brport_info = {
924 .brport = {
925 .ctx = ctx,
926 .atomic_nb = atomic_nb,
927 .blocking_nb = blocking_nb,
928 },
929 };
930
931 ASSERT_RTNL();
932
933 call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_UNOFFLOADED,
934 brport_dev, &brport_info.info,
935 NULL);
936}
937EXPORT_SYMBOL_GPL(switchdev_bridge_port_unoffload);
938
939int switchdev_bridge_port_replay(struct net_device *brport_dev,
940 struct net_device *dev, const void *ctx,
941 struct notifier_block *atomic_nb,
942 struct notifier_block *blocking_nb,
943 struct netlink_ext_ack *extack)
944{
945 struct switchdev_notifier_brport_info brport_info = {
946 .brport = {
947 .dev = dev,
948 .ctx = ctx,
949 .atomic_nb = atomic_nb,
950 .blocking_nb = blocking_nb,
951 },
952 };
953 int err;
954
955 ASSERT_RTNL();
956
957 err = call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_REPLAY,
958 brport_dev, &brport_info.info,
959 extack);
960 return notifier_to_errno(err);
961}
962EXPORT_SYMBOL_GPL(switchdev_bridge_port_replay);