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1/*
2 * net/switchdev/switchdev.c - Switch device API
3 * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
4 * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/init.h>
15#include <linux/mutex.h>
16#include <linux/notifier.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
19#include <linux/if_bridge.h>
20#include <linux/list.h>
21#include <linux/workqueue.h>
22#include <linux/if_vlan.h>
23#include <linux/rtnetlink.h>
24#include <net/switchdev.h>
25
26/**
27 * switchdev_trans_item_enqueue - Enqueue data item to transaction queue
28 *
29 * @trans: transaction
30 * @data: pointer to data being queued
31 * @destructor: data destructor
32 * @tritem: transaction item being queued
33 *
34 * Enqeueue data item to transaction queue. tritem is typically placed in
35 * cointainter pointed at by data pointer. Destructor is called on
36 * transaction abort and after successful commit phase in case
37 * the caller did not dequeue the item before.
38 */
39void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
40 void *data, void (*destructor)(void const *),
41 struct switchdev_trans_item *tritem)
42{
43 tritem->data = data;
44 tritem->destructor = destructor;
45 list_add_tail(&tritem->list, &trans->item_list);
46}
47EXPORT_SYMBOL_GPL(switchdev_trans_item_enqueue);
48
49static struct switchdev_trans_item *
50__switchdev_trans_item_dequeue(struct switchdev_trans *trans)
51{
52 struct switchdev_trans_item *tritem;
53
54 if (list_empty(&trans->item_list))
55 return NULL;
56 tritem = list_first_entry(&trans->item_list,
57 struct switchdev_trans_item, list);
58 list_del(&tritem->list);
59 return tritem;
60}
61
62/**
63 * switchdev_trans_item_dequeue - Dequeue data item from transaction queue
64 *
65 * @trans: transaction
66 */
67void *switchdev_trans_item_dequeue(struct switchdev_trans *trans)
68{
69 struct switchdev_trans_item *tritem;
70
71 tritem = __switchdev_trans_item_dequeue(trans);
72 BUG_ON(!tritem);
73 return tritem->data;
74}
75EXPORT_SYMBOL_GPL(switchdev_trans_item_dequeue);
76
77static void switchdev_trans_init(struct switchdev_trans *trans)
78{
79 INIT_LIST_HEAD(&trans->item_list);
80}
81
82static void switchdev_trans_items_destroy(struct switchdev_trans *trans)
83{
84 struct switchdev_trans_item *tritem;
85
86 while ((tritem = __switchdev_trans_item_dequeue(trans)))
87 tritem->destructor(tritem->data);
88}
89
90static void switchdev_trans_items_warn_destroy(struct net_device *dev,
91 struct switchdev_trans *trans)
92{
93 WARN(!list_empty(&trans->item_list), "%s: transaction item queue is not empty.\n",
94 dev->name);
95 switchdev_trans_items_destroy(trans);
96}
97
98static LIST_HEAD(deferred);
99static DEFINE_SPINLOCK(deferred_lock);
100
101typedef void switchdev_deferred_func_t(struct net_device *dev,
102 const void *data);
103
104struct switchdev_deferred_item {
105 struct list_head list;
106 struct net_device *dev;
107 switchdev_deferred_func_t *func;
108 unsigned long data[0];
109};
110
111static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
112{
113 struct switchdev_deferred_item *dfitem;
114
115 spin_lock_bh(&deferred_lock);
116 if (list_empty(&deferred)) {
117 dfitem = NULL;
118 goto unlock;
119 }
120 dfitem = list_first_entry(&deferred,
121 struct switchdev_deferred_item, list);
122 list_del(&dfitem->list);
123unlock:
124 spin_unlock_bh(&deferred_lock);
125 return dfitem;
126}
127
128/**
129 * switchdev_deferred_process - Process ops in deferred queue
130 *
131 * Called to flush the ops currently queued in deferred ops queue.
132 * rtnl_lock must be held.
133 */
134void switchdev_deferred_process(void)
135{
136 struct switchdev_deferred_item *dfitem;
137
138 ASSERT_RTNL();
139
140 while ((dfitem = switchdev_deferred_dequeue())) {
141 dfitem->func(dfitem->dev, dfitem->data);
142 dev_put(dfitem->dev);
143 kfree(dfitem);
144 }
145}
146EXPORT_SYMBOL_GPL(switchdev_deferred_process);
147
148static void switchdev_deferred_process_work(struct work_struct *work)
149{
150 rtnl_lock();
151 switchdev_deferred_process();
152 rtnl_unlock();
153}
154
155static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
156
157static int switchdev_deferred_enqueue(struct net_device *dev,
158 const void *data, size_t data_len,
159 switchdev_deferred_func_t *func)
160{
161 struct switchdev_deferred_item *dfitem;
162
163 dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
164 if (!dfitem)
165 return -ENOMEM;
166 dfitem->dev = dev;
167 dfitem->func = func;
168 memcpy(dfitem->data, data, data_len);
169 dev_hold(dev);
170 spin_lock_bh(&deferred_lock);
171 list_add_tail(&dfitem->list, &deferred);
172 spin_unlock_bh(&deferred_lock);
173 schedule_work(&deferred_process_work);
174 return 0;
175}
176
177/**
178 * switchdev_port_attr_get - Get port attribute
179 *
180 * @dev: port device
181 * @attr: attribute to get
182 */
183int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
184{
185 const struct switchdev_ops *ops = dev->switchdev_ops;
186 struct net_device *lower_dev;
187 struct list_head *iter;
188 struct switchdev_attr first = {
189 .id = SWITCHDEV_ATTR_ID_UNDEFINED
190 };
191 int err = -EOPNOTSUPP;
192
193 if (ops && ops->switchdev_port_attr_get)
194 return ops->switchdev_port_attr_get(dev, attr);
195
196 if (attr->flags & SWITCHDEV_F_NO_RECURSE)
197 return err;
198
199 /* Switch device port(s) may be stacked under
200 * bond/team/vlan dev, so recurse down to get attr on
201 * each port. Return -ENODATA if attr values don't
202 * compare across ports.
203 */
204
205 netdev_for_each_lower_dev(dev, lower_dev, iter) {
206 err = switchdev_port_attr_get(lower_dev, attr);
207 if (err)
208 break;
209 if (first.id == SWITCHDEV_ATTR_ID_UNDEFINED)
210 first = *attr;
211 else if (memcmp(&first, attr, sizeof(*attr)))
212 return -ENODATA;
213 }
214
215 return err;
216}
217EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
218
219static int __switchdev_port_attr_set(struct net_device *dev,
220 const struct switchdev_attr *attr,
221 struct switchdev_trans *trans)
222{
223 const struct switchdev_ops *ops = dev->switchdev_ops;
224 struct net_device *lower_dev;
225 struct list_head *iter;
226 int err = -EOPNOTSUPP;
227
228 if (ops && ops->switchdev_port_attr_set) {
229 err = ops->switchdev_port_attr_set(dev, attr, trans);
230 goto done;
231 }
232
233 if (attr->flags & SWITCHDEV_F_NO_RECURSE)
234 goto done;
235
236 /* Switch device port(s) may be stacked under
237 * bond/team/vlan dev, so recurse down to set attr on
238 * each port.
239 */
240
241 netdev_for_each_lower_dev(dev, lower_dev, iter) {
242 err = __switchdev_port_attr_set(lower_dev, attr, trans);
243 if (err)
244 break;
245 }
246
247done:
248 if (err == -EOPNOTSUPP && attr->flags & SWITCHDEV_F_SKIP_EOPNOTSUPP)
249 err = 0;
250
251 return err;
252}
253
254static int switchdev_port_attr_set_now(struct net_device *dev,
255 const struct switchdev_attr *attr)
256{
257 struct switchdev_trans trans;
258 int err;
259
260 switchdev_trans_init(&trans);
261
262 /* Phase I: prepare for attr set. Driver/device should fail
263 * here if there are going to be issues in the commit phase,
264 * such as lack of resources or support. The driver/device
265 * should reserve resources needed for the commit phase here,
266 * but should not commit the attr.
267 */
268
269 trans.ph_prepare = true;
270 err = __switchdev_port_attr_set(dev, attr, &trans);
271 if (err) {
272 /* Prepare phase failed: abort the transaction. Any
273 * resources reserved in the prepare phase are
274 * released.
275 */
276
277 if (err != -EOPNOTSUPP)
278 switchdev_trans_items_destroy(&trans);
279
280 return err;
281 }
282
283 /* Phase II: commit attr set. This cannot fail as a fault
284 * of driver/device. If it does, it's a bug in the driver/device
285 * because the driver said everythings was OK in phase I.
286 */
287
288 trans.ph_prepare = false;
289 err = __switchdev_port_attr_set(dev, attr, &trans);
290 WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
291 dev->name, attr->id);
292 switchdev_trans_items_warn_destroy(dev, &trans);
293
294 return err;
295}
296
297static void switchdev_port_attr_set_deferred(struct net_device *dev,
298 const void *data)
299{
300 const struct switchdev_attr *attr = data;
301 int err;
302
303 err = switchdev_port_attr_set_now(dev, attr);
304 if (err && err != -EOPNOTSUPP)
305 netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
306 err, attr->id);
307 if (attr->complete)
308 attr->complete(dev, err, attr->complete_priv);
309}
310
311static int switchdev_port_attr_set_defer(struct net_device *dev,
312 const struct switchdev_attr *attr)
313{
314 return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
315 switchdev_port_attr_set_deferred);
316}
317
318/**
319 * switchdev_port_attr_set - Set port attribute
320 *
321 * @dev: port device
322 * @attr: attribute to set
323 *
324 * Use a 2-phase prepare-commit transaction model to ensure
325 * system is not left in a partially updated state due to
326 * failure from driver/device.
327 *
328 * rtnl_lock must be held and must not be in atomic section,
329 * in case SWITCHDEV_F_DEFER flag is not set.
330 */
331int switchdev_port_attr_set(struct net_device *dev,
332 const struct switchdev_attr *attr)
333{
334 if (attr->flags & SWITCHDEV_F_DEFER)
335 return switchdev_port_attr_set_defer(dev, attr);
336 ASSERT_RTNL();
337 return switchdev_port_attr_set_now(dev, attr);
338}
339EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
340
341static size_t switchdev_obj_size(const struct switchdev_obj *obj)
342{
343 switch (obj->id) {
344 case SWITCHDEV_OBJ_ID_PORT_VLAN:
345 return sizeof(struct switchdev_obj_port_vlan);
346 case SWITCHDEV_OBJ_ID_PORT_FDB:
347 return sizeof(struct switchdev_obj_port_fdb);
348 case SWITCHDEV_OBJ_ID_PORT_MDB:
349 return sizeof(struct switchdev_obj_port_mdb);
350 default:
351 BUG();
352 }
353 return 0;
354}
355
356static int __switchdev_port_obj_add(struct net_device *dev,
357 const struct switchdev_obj *obj,
358 struct switchdev_trans *trans)
359{
360 const struct switchdev_ops *ops = dev->switchdev_ops;
361 struct net_device *lower_dev;
362 struct list_head *iter;
363 int err = -EOPNOTSUPP;
364
365 if (ops && ops->switchdev_port_obj_add)
366 return ops->switchdev_port_obj_add(dev, obj, trans);
367
368 /* Switch device port(s) may be stacked under
369 * bond/team/vlan dev, so recurse down to add object on
370 * each port.
371 */
372
373 netdev_for_each_lower_dev(dev, lower_dev, iter) {
374 err = __switchdev_port_obj_add(lower_dev, obj, trans);
375 if (err)
376 break;
377 }
378
379 return err;
380}
381
382static int switchdev_port_obj_add_now(struct net_device *dev,
383 const struct switchdev_obj *obj)
384{
385 struct switchdev_trans trans;
386 int err;
387
388 ASSERT_RTNL();
389
390 switchdev_trans_init(&trans);
391
392 /* Phase I: prepare for obj add. Driver/device should fail
393 * here if there are going to be issues in the commit phase,
394 * such as lack of resources or support. The driver/device
395 * should reserve resources needed for the commit phase here,
396 * but should not commit the obj.
397 */
398
399 trans.ph_prepare = true;
400 err = __switchdev_port_obj_add(dev, obj, &trans);
401 if (err) {
402 /* Prepare phase failed: abort the transaction. Any
403 * resources reserved in the prepare phase are
404 * released.
405 */
406
407 if (err != -EOPNOTSUPP)
408 switchdev_trans_items_destroy(&trans);
409
410 return err;
411 }
412
413 /* Phase II: commit obj add. This cannot fail as a fault
414 * of driver/device. If it does, it's a bug in the driver/device
415 * because the driver said everythings was OK in phase I.
416 */
417
418 trans.ph_prepare = false;
419 err = __switchdev_port_obj_add(dev, obj, &trans);
420 WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
421 switchdev_trans_items_warn_destroy(dev, &trans);
422
423 return err;
424}
425
426static void switchdev_port_obj_add_deferred(struct net_device *dev,
427 const void *data)
428{
429 const struct switchdev_obj *obj = data;
430 int err;
431
432 err = switchdev_port_obj_add_now(dev, obj);
433 if (err && err != -EOPNOTSUPP)
434 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
435 err, obj->id);
436 if (obj->complete)
437 obj->complete(dev, err, obj->complete_priv);
438}
439
440static int switchdev_port_obj_add_defer(struct net_device *dev,
441 const struct switchdev_obj *obj)
442{
443 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
444 switchdev_port_obj_add_deferred);
445}
446
447/**
448 * switchdev_port_obj_add - Add port object
449 *
450 * @dev: port device
451 * @id: object ID
452 * @obj: object to add
453 *
454 * Use a 2-phase prepare-commit transaction model to ensure
455 * system is not left in a partially updated state due to
456 * failure from driver/device.
457 *
458 * rtnl_lock must be held and must not be in atomic section,
459 * in case SWITCHDEV_F_DEFER flag is not set.
460 */
461int switchdev_port_obj_add(struct net_device *dev,
462 const struct switchdev_obj *obj)
463{
464 if (obj->flags & SWITCHDEV_F_DEFER)
465 return switchdev_port_obj_add_defer(dev, obj);
466 ASSERT_RTNL();
467 return switchdev_port_obj_add_now(dev, obj);
468}
469EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
470
471static int switchdev_port_obj_del_now(struct net_device *dev,
472 const struct switchdev_obj *obj)
473{
474 const struct switchdev_ops *ops = dev->switchdev_ops;
475 struct net_device *lower_dev;
476 struct list_head *iter;
477 int err = -EOPNOTSUPP;
478
479 if (ops && ops->switchdev_port_obj_del)
480 return ops->switchdev_port_obj_del(dev, obj);
481
482 /* Switch device port(s) may be stacked under
483 * bond/team/vlan dev, so recurse down to delete object on
484 * each port.
485 */
486
487 netdev_for_each_lower_dev(dev, lower_dev, iter) {
488 err = switchdev_port_obj_del_now(lower_dev, obj);
489 if (err)
490 break;
491 }
492
493 return err;
494}
495
496static void switchdev_port_obj_del_deferred(struct net_device *dev,
497 const void *data)
498{
499 const struct switchdev_obj *obj = data;
500 int err;
501
502 err = switchdev_port_obj_del_now(dev, obj);
503 if (err && err != -EOPNOTSUPP)
504 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
505 err, obj->id);
506 if (obj->complete)
507 obj->complete(dev, err, obj->complete_priv);
508}
509
510static int switchdev_port_obj_del_defer(struct net_device *dev,
511 const struct switchdev_obj *obj)
512{
513 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
514 switchdev_port_obj_del_deferred);
515}
516
517/**
518 * switchdev_port_obj_del - Delete port object
519 *
520 * @dev: port device
521 * @id: object ID
522 * @obj: object to delete
523 *
524 * rtnl_lock must be held and must not be in atomic section,
525 * in case SWITCHDEV_F_DEFER flag is not set.
526 */
527int switchdev_port_obj_del(struct net_device *dev,
528 const struct switchdev_obj *obj)
529{
530 if (obj->flags & SWITCHDEV_F_DEFER)
531 return switchdev_port_obj_del_defer(dev, obj);
532 ASSERT_RTNL();
533 return switchdev_port_obj_del_now(dev, obj);
534}
535EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
536
537/**
538 * switchdev_port_obj_dump - Dump port objects
539 *
540 * @dev: port device
541 * @id: object ID
542 * @obj: object to dump
543 * @cb: function to call with a filled object
544 *
545 * rtnl_lock must be held.
546 */
547int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj,
548 switchdev_obj_dump_cb_t *cb)
549{
550 const struct switchdev_ops *ops = dev->switchdev_ops;
551 struct net_device *lower_dev;
552 struct list_head *iter;
553 int err = -EOPNOTSUPP;
554
555 ASSERT_RTNL();
556
557 if (ops && ops->switchdev_port_obj_dump)
558 return ops->switchdev_port_obj_dump(dev, obj, cb);
559
560 /* Switch device port(s) may be stacked under
561 * bond/team/vlan dev, so recurse down to dump objects on
562 * first port at bottom of stack.
563 */
564
565 netdev_for_each_lower_dev(dev, lower_dev, iter) {
566 err = switchdev_port_obj_dump(lower_dev, obj, cb);
567 break;
568 }
569
570 return err;
571}
572EXPORT_SYMBOL_GPL(switchdev_port_obj_dump);
573
574static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
575
576/**
577 * register_switchdev_notifier - Register notifier
578 * @nb: notifier_block
579 *
580 * Register switch device notifier. This should be used by code
581 * which needs to monitor events happening in particular device.
582 * Return values are same as for atomic_notifier_chain_register().
583 */
584int register_switchdev_notifier(struct notifier_block *nb)
585{
586 int err;
587
588 rtnl_lock();
589 err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
590 rtnl_unlock();
591 return err;
592}
593EXPORT_SYMBOL_GPL(register_switchdev_notifier);
594
595/**
596 * unregister_switchdev_notifier - Unregister notifier
597 * @nb: notifier_block
598 *
599 * Unregister switch device notifier.
600 * Return values are same as for atomic_notifier_chain_unregister().
601 */
602int unregister_switchdev_notifier(struct notifier_block *nb)
603{
604 int err;
605
606 rtnl_lock();
607 err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
608 rtnl_unlock();
609 return err;
610}
611EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
612
613/**
614 * call_switchdev_notifiers - Call notifiers
615 * @val: value passed unmodified to notifier function
616 * @dev: port device
617 * @info: notifier information data
618 *
619 * Call all network notifier blocks. This should be called by driver
620 * when it needs to propagate hardware event.
621 * Return values are same as for atomic_notifier_call_chain().
622 * rtnl_lock must be held.
623 */
624int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
625 struct switchdev_notifier_info *info)
626{
627 ASSERT_RTNL();
628
629 info->dev = dev;
630 return raw_notifier_call_chain(&switchdev_notif_chain, val, info);
631}
632EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
633
634struct switchdev_vlan_dump {
635 struct switchdev_obj_port_vlan vlan;
636 struct sk_buff *skb;
637 u32 filter_mask;
638 u16 flags;
639 u16 begin;
640 u16 end;
641};
642
643static int switchdev_port_vlan_dump_put(struct switchdev_vlan_dump *dump)
644{
645 struct bridge_vlan_info vinfo;
646
647 vinfo.flags = dump->flags;
648
649 if (dump->begin == 0 && dump->end == 0) {
650 return 0;
651 } else if (dump->begin == dump->end) {
652 vinfo.vid = dump->begin;
653 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
654 sizeof(vinfo), &vinfo))
655 return -EMSGSIZE;
656 } else {
657 vinfo.vid = dump->begin;
658 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
659 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
660 sizeof(vinfo), &vinfo))
661 return -EMSGSIZE;
662 vinfo.vid = dump->end;
663 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
664 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_END;
665 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
666 sizeof(vinfo), &vinfo))
667 return -EMSGSIZE;
668 }
669
670 return 0;
671}
672
673static int switchdev_port_vlan_dump_cb(struct switchdev_obj *obj)
674{
675 struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
676 struct switchdev_vlan_dump *dump =
677 container_of(vlan, struct switchdev_vlan_dump, vlan);
678 int err = 0;
679
680 if (vlan->vid_begin > vlan->vid_end)
681 return -EINVAL;
682
683 if (dump->filter_mask & RTEXT_FILTER_BRVLAN) {
684 dump->flags = vlan->flags;
685 for (dump->begin = dump->end = vlan->vid_begin;
686 dump->begin <= vlan->vid_end;
687 dump->begin++, dump->end++) {
688 err = switchdev_port_vlan_dump_put(dump);
689 if (err)
690 return err;
691 }
692 } else if (dump->filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) {
693 if (dump->begin > vlan->vid_begin &&
694 dump->begin >= vlan->vid_end) {
695 if ((dump->begin - 1) == vlan->vid_end &&
696 dump->flags == vlan->flags) {
697 /* prepend */
698 dump->begin = vlan->vid_begin;
699 } else {
700 err = switchdev_port_vlan_dump_put(dump);
701 dump->flags = vlan->flags;
702 dump->begin = vlan->vid_begin;
703 dump->end = vlan->vid_end;
704 }
705 } else if (dump->end <= vlan->vid_begin &&
706 dump->end < vlan->vid_end) {
707 if ((dump->end + 1) == vlan->vid_begin &&
708 dump->flags == vlan->flags) {
709 /* append */
710 dump->end = vlan->vid_end;
711 } else {
712 err = switchdev_port_vlan_dump_put(dump);
713 dump->flags = vlan->flags;
714 dump->begin = vlan->vid_begin;
715 dump->end = vlan->vid_end;
716 }
717 } else {
718 err = -EINVAL;
719 }
720 }
721
722 return err;
723}
724
725static int switchdev_port_vlan_fill(struct sk_buff *skb, struct net_device *dev,
726 u32 filter_mask)
727{
728 struct switchdev_vlan_dump dump = {
729 .vlan.obj.orig_dev = dev,
730 .vlan.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
731 .skb = skb,
732 .filter_mask = filter_mask,
733 };
734 int err = 0;
735
736 if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
737 (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
738 err = switchdev_port_obj_dump(dev, &dump.vlan.obj,
739 switchdev_port_vlan_dump_cb);
740 if (err)
741 goto err_out;
742 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
743 /* last one */
744 err = switchdev_port_vlan_dump_put(&dump);
745 }
746
747err_out:
748 return err == -EOPNOTSUPP ? 0 : err;
749}
750
751/**
752 * switchdev_port_bridge_getlink - Get bridge port attributes
753 *
754 * @dev: port device
755 *
756 * Called for SELF on rtnl_bridge_getlink to get bridge port
757 * attributes.
758 */
759int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
760 struct net_device *dev, u32 filter_mask,
761 int nlflags)
762{
763 struct switchdev_attr attr = {
764 .orig_dev = dev,
765 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
766 };
767 u16 mode = BRIDGE_MODE_UNDEF;
768 u32 mask = BR_LEARNING | BR_LEARNING_SYNC | BR_FLOOD;
769 int err;
770
771 if (!netif_is_bridge_port(dev))
772 return -EOPNOTSUPP;
773
774 err = switchdev_port_attr_get(dev, &attr);
775 if (err && err != -EOPNOTSUPP)
776 return err;
777
778 return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
779 attr.u.brport_flags, mask, nlflags,
780 filter_mask, switchdev_port_vlan_fill);
781}
782EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
783
784static int switchdev_port_br_setflag(struct net_device *dev,
785 struct nlattr *nlattr,
786 unsigned long brport_flag)
787{
788 struct switchdev_attr attr = {
789 .orig_dev = dev,
790 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
791 };
792 u8 flag = nla_get_u8(nlattr);
793 int err;
794
795 err = switchdev_port_attr_get(dev, &attr);
796 if (err)
797 return err;
798
799 if (flag)
800 attr.u.brport_flags |= brport_flag;
801 else
802 attr.u.brport_flags &= ~brport_flag;
803
804 return switchdev_port_attr_set(dev, &attr);
805}
806
807static const struct nla_policy
808switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
809 [IFLA_BRPORT_STATE] = { .type = NLA_U8 },
810 [IFLA_BRPORT_COST] = { .type = NLA_U32 },
811 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
812 [IFLA_BRPORT_MODE] = { .type = NLA_U8 },
813 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
814 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
815 [IFLA_BRPORT_FAST_LEAVE] = { .type = NLA_U8 },
816 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
817 [IFLA_BRPORT_LEARNING_SYNC] = { .type = NLA_U8 },
818 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
819};
820
821static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
822 struct nlattr *protinfo)
823{
824 struct nlattr *attr;
825 int rem;
826 int err;
827
828 err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
829 switchdev_port_bridge_policy);
830 if (err)
831 return err;
832
833 nla_for_each_nested(attr, protinfo, rem) {
834 switch (nla_type(attr)) {
835 case IFLA_BRPORT_LEARNING:
836 err = switchdev_port_br_setflag(dev, attr,
837 BR_LEARNING);
838 break;
839 case IFLA_BRPORT_LEARNING_SYNC:
840 err = switchdev_port_br_setflag(dev, attr,
841 BR_LEARNING_SYNC);
842 break;
843 case IFLA_BRPORT_UNICAST_FLOOD:
844 err = switchdev_port_br_setflag(dev, attr, BR_FLOOD);
845 break;
846 default:
847 err = -EOPNOTSUPP;
848 break;
849 }
850 if (err)
851 return err;
852 }
853
854 return 0;
855}
856
857static int switchdev_port_br_afspec(struct net_device *dev,
858 struct nlattr *afspec,
859 int (*f)(struct net_device *dev,
860 const struct switchdev_obj *obj))
861{
862 struct nlattr *attr;
863 struct bridge_vlan_info *vinfo;
864 struct switchdev_obj_port_vlan vlan = {
865 .obj.orig_dev = dev,
866 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
867 };
868 int rem;
869 int err;
870
871 nla_for_each_nested(attr, afspec, rem) {
872 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
873 continue;
874 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
875 return -EINVAL;
876 vinfo = nla_data(attr);
877 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
878 return -EINVAL;
879 vlan.flags = vinfo->flags;
880 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
881 if (vlan.vid_begin)
882 return -EINVAL;
883 vlan.vid_begin = vinfo->vid;
884 /* don't allow range of pvids */
885 if (vlan.flags & BRIDGE_VLAN_INFO_PVID)
886 return -EINVAL;
887 } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
888 if (!vlan.vid_begin)
889 return -EINVAL;
890 vlan.vid_end = vinfo->vid;
891 if (vlan.vid_end <= vlan.vid_begin)
892 return -EINVAL;
893 err = f(dev, &vlan.obj);
894 if (err)
895 return err;
896 vlan.vid_begin = 0;
897 } else {
898 if (vlan.vid_begin)
899 return -EINVAL;
900 vlan.vid_begin = vinfo->vid;
901 vlan.vid_end = vinfo->vid;
902 err = f(dev, &vlan.obj);
903 if (err)
904 return err;
905 vlan.vid_begin = 0;
906 }
907 }
908
909 return 0;
910}
911
912/**
913 * switchdev_port_bridge_setlink - Set bridge port attributes
914 *
915 * @dev: port device
916 * @nlh: netlink header
917 * @flags: netlink flags
918 *
919 * Called for SELF on rtnl_bridge_setlink to set bridge port
920 * attributes.
921 */
922int switchdev_port_bridge_setlink(struct net_device *dev,
923 struct nlmsghdr *nlh, u16 flags)
924{
925 struct nlattr *protinfo;
926 struct nlattr *afspec;
927 int err = 0;
928
929 if (!netif_is_bridge_port(dev))
930 return -EOPNOTSUPP;
931
932 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
933 IFLA_PROTINFO);
934 if (protinfo) {
935 err = switchdev_port_br_setlink_protinfo(dev, protinfo);
936 if (err)
937 return err;
938 }
939
940 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
941 IFLA_AF_SPEC);
942 if (afspec)
943 err = switchdev_port_br_afspec(dev, afspec,
944 switchdev_port_obj_add);
945
946 return err;
947}
948EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
949
950/**
951 * switchdev_port_bridge_dellink - Set bridge port attributes
952 *
953 * @dev: port device
954 * @nlh: netlink header
955 * @flags: netlink flags
956 *
957 * Called for SELF on rtnl_bridge_dellink to set bridge port
958 * attributes.
959 */
960int switchdev_port_bridge_dellink(struct net_device *dev,
961 struct nlmsghdr *nlh, u16 flags)
962{
963 struct nlattr *afspec;
964
965 if (!netif_is_bridge_port(dev))
966 return -EOPNOTSUPP;
967
968 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
969 IFLA_AF_SPEC);
970 if (afspec)
971 return switchdev_port_br_afspec(dev, afspec,
972 switchdev_port_obj_del);
973
974 return 0;
975}
976EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
977
978/**
979 * switchdev_port_fdb_add - Add FDB (MAC/VLAN) entry to port
980 *
981 * @ndmsg: netlink hdr
982 * @nlattr: netlink attributes
983 * @dev: port device
984 * @addr: MAC address to add
985 * @vid: VLAN to add
986 *
987 * Add FDB entry to switch device.
988 */
989int switchdev_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
990 struct net_device *dev, const unsigned char *addr,
991 u16 vid, u16 nlm_flags)
992{
993 struct switchdev_obj_port_fdb fdb = {
994 .obj.orig_dev = dev,
995 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
996 .vid = vid,
997 };
998
999 ether_addr_copy(fdb.addr, addr);
1000 return switchdev_port_obj_add(dev, &fdb.obj);
1001}
1002EXPORT_SYMBOL_GPL(switchdev_port_fdb_add);
1003
1004/**
1005 * switchdev_port_fdb_del - Delete FDB (MAC/VLAN) entry from port
1006 *
1007 * @ndmsg: netlink hdr
1008 * @nlattr: netlink attributes
1009 * @dev: port device
1010 * @addr: MAC address to delete
1011 * @vid: VLAN to delete
1012 *
1013 * Delete FDB entry from switch device.
1014 */
1015int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1016 struct net_device *dev, const unsigned char *addr,
1017 u16 vid)
1018{
1019 struct switchdev_obj_port_fdb fdb = {
1020 .obj.orig_dev = dev,
1021 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1022 .vid = vid,
1023 };
1024
1025 ether_addr_copy(fdb.addr, addr);
1026 return switchdev_port_obj_del(dev, &fdb.obj);
1027}
1028EXPORT_SYMBOL_GPL(switchdev_port_fdb_del);
1029
1030struct switchdev_fdb_dump {
1031 struct switchdev_obj_port_fdb fdb;
1032 struct net_device *dev;
1033 struct sk_buff *skb;
1034 struct netlink_callback *cb;
1035 int idx;
1036};
1037
1038static int switchdev_port_fdb_dump_cb(struct switchdev_obj *obj)
1039{
1040 struct switchdev_obj_port_fdb *fdb = SWITCHDEV_OBJ_PORT_FDB(obj);
1041 struct switchdev_fdb_dump *dump =
1042 container_of(fdb, struct switchdev_fdb_dump, fdb);
1043 u32 portid = NETLINK_CB(dump->cb->skb).portid;
1044 u32 seq = dump->cb->nlh->nlmsg_seq;
1045 struct nlmsghdr *nlh;
1046 struct ndmsg *ndm;
1047
1048 if (dump->idx < dump->cb->args[2])
1049 goto skip;
1050
1051 nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
1052 sizeof(*ndm), NLM_F_MULTI);
1053 if (!nlh)
1054 return -EMSGSIZE;
1055
1056 ndm = nlmsg_data(nlh);
1057 ndm->ndm_family = AF_BRIDGE;
1058 ndm->ndm_pad1 = 0;
1059 ndm->ndm_pad2 = 0;
1060 ndm->ndm_flags = NTF_SELF;
1061 ndm->ndm_type = 0;
1062 ndm->ndm_ifindex = dump->dev->ifindex;
1063 ndm->ndm_state = fdb->ndm_state;
1064
1065 if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, fdb->addr))
1066 goto nla_put_failure;
1067
1068 if (fdb->vid && nla_put_u16(dump->skb, NDA_VLAN, fdb->vid))
1069 goto nla_put_failure;
1070
1071 nlmsg_end(dump->skb, nlh);
1072
1073skip:
1074 dump->idx++;
1075 return 0;
1076
1077nla_put_failure:
1078 nlmsg_cancel(dump->skb, nlh);
1079 return -EMSGSIZE;
1080}
1081
1082/**
1083 * switchdev_port_fdb_dump - Dump port FDB (MAC/VLAN) entries
1084 *
1085 * @skb: netlink skb
1086 * @cb: netlink callback
1087 * @dev: port device
1088 * @filter_dev: filter device
1089 * @idx:
1090 *
1091 * Dump FDB entries from switch device.
1092 */
1093int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1094 struct net_device *dev,
1095 struct net_device *filter_dev, int *idx)
1096{
1097 struct switchdev_fdb_dump dump = {
1098 .fdb.obj.orig_dev = dev,
1099 .fdb.obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1100 .dev = dev,
1101 .skb = skb,
1102 .cb = cb,
1103 .idx = *idx,
1104 };
1105 int err;
1106
1107 err = switchdev_port_obj_dump(dev, &dump.fdb.obj,
1108 switchdev_port_fdb_dump_cb);
1109 *idx = dump.idx;
1110 return err;
1111}
1112EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);
1113
1114bool switchdev_port_same_parent_id(struct net_device *a,
1115 struct net_device *b)
1116{
1117 struct switchdev_attr a_attr = {
1118 .orig_dev = a,
1119 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1120 };
1121 struct switchdev_attr b_attr = {
1122 .orig_dev = b,
1123 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1124 };
1125
1126 if (switchdev_port_attr_get(a, &a_attr) ||
1127 switchdev_port_attr_get(b, &b_attr))
1128 return false;
1129
1130 return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
1131}
1132EXPORT_SYMBOL_GPL(switchdev_port_same_parent_id);
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 <jiri@resnulli.us>
5 * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
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 switchdev_deferred_func_t *func;
32 unsigned long data[0];
33};
34
35static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
36{
37 struct switchdev_deferred_item *dfitem;
38
39 spin_lock_bh(&deferred_lock);
40 if (list_empty(&deferred)) {
41 dfitem = NULL;
42 goto unlock;
43 }
44 dfitem = list_first_entry(&deferred,
45 struct switchdev_deferred_item, list);
46 list_del(&dfitem->list);
47unlock:
48 spin_unlock_bh(&deferred_lock);
49 return dfitem;
50}
51
52/**
53 * switchdev_deferred_process - Process ops in deferred queue
54 *
55 * Called to flush the ops currently queued in deferred ops queue.
56 * rtnl_lock must be held.
57 */
58void switchdev_deferred_process(void)
59{
60 struct switchdev_deferred_item *dfitem;
61
62 ASSERT_RTNL();
63
64 while ((dfitem = switchdev_deferred_dequeue())) {
65 dfitem->func(dfitem->dev, dfitem->data);
66 dev_put(dfitem->dev);
67 kfree(dfitem);
68 }
69}
70EXPORT_SYMBOL_GPL(switchdev_deferred_process);
71
72static void switchdev_deferred_process_work(struct work_struct *work)
73{
74 rtnl_lock();
75 switchdev_deferred_process();
76 rtnl_unlock();
77}
78
79static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
80
81static int switchdev_deferred_enqueue(struct net_device *dev,
82 const void *data, size_t data_len,
83 switchdev_deferred_func_t *func)
84{
85 struct switchdev_deferred_item *dfitem;
86
87 dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
88 if (!dfitem)
89 return -ENOMEM;
90 dfitem->dev = dev;
91 dfitem->func = func;
92 memcpy(dfitem->data, data, data_len);
93 dev_hold(dev);
94 spin_lock_bh(&deferred_lock);
95 list_add_tail(&dfitem->list, &deferred);
96 spin_unlock_bh(&deferred_lock);
97 schedule_work(&deferred_process_work);
98 return 0;
99}
100
101static int switchdev_port_attr_notify(enum switchdev_notifier_type nt,
102 struct net_device *dev,
103 const struct switchdev_attr *attr,
104 struct switchdev_trans *trans)
105{
106 int err;
107 int rc;
108
109 struct switchdev_notifier_port_attr_info attr_info = {
110 .attr = attr,
111 .trans = trans,
112 .handled = false,
113 };
114
115 rc = call_switchdev_blocking_notifiers(nt, dev,
116 &attr_info.info, NULL);
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{
132 struct switchdev_trans trans;
133 int err;
134
135 /* Phase I: prepare for attr set. Driver/device should fail
136 * here if there are going to be issues in the commit phase,
137 * such as lack of resources or support. The driver/device
138 * should reserve resources needed for the commit phase here,
139 * but should not commit the attr.
140 */
141
142 trans.ph_prepare = true;
143 err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
144 &trans);
145 if (err)
146 return err;
147
148 /* Phase II: commit attr set. This cannot fail as a fault
149 * of driver/device. If it does, it's a bug in the driver/device
150 * because the driver said everythings was OK in phase I.
151 */
152
153 trans.ph_prepare = false;
154 err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
155 &trans);
156 WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
157 dev->name, attr->id);
158
159 return err;
160}
161
162static void switchdev_port_attr_set_deferred(struct net_device *dev,
163 const void *data)
164{
165 const struct switchdev_attr *attr = data;
166 int err;
167
168 err = switchdev_port_attr_set_now(dev, attr);
169 if (err && err != -EOPNOTSUPP)
170 netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
171 err, attr->id);
172 if (attr->complete)
173 attr->complete(dev, err, attr->complete_priv);
174}
175
176static int switchdev_port_attr_set_defer(struct net_device *dev,
177 const struct switchdev_attr *attr)
178{
179 return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
180 switchdev_port_attr_set_deferred);
181}
182
183/**
184 * switchdev_port_attr_set - Set port attribute
185 *
186 * @dev: port device
187 * @attr: attribute to set
188 *
189 * Use a 2-phase prepare-commit transaction model to ensure
190 * system is not left in a partially updated state due to
191 * failure from driver/device.
192 *
193 * rtnl_lock must be held and must not be in atomic section,
194 * in case SWITCHDEV_F_DEFER flag is not set.
195 */
196int switchdev_port_attr_set(struct net_device *dev,
197 const struct switchdev_attr *attr)
198{
199 if (attr->flags & SWITCHDEV_F_DEFER)
200 return switchdev_port_attr_set_defer(dev, attr);
201 ASSERT_RTNL();
202 return switchdev_port_attr_set_now(dev, attr);
203}
204EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
205
206static size_t switchdev_obj_size(const struct switchdev_obj *obj)
207{
208 switch (obj->id) {
209 case SWITCHDEV_OBJ_ID_PORT_VLAN:
210 return sizeof(struct switchdev_obj_port_vlan);
211 case SWITCHDEV_OBJ_ID_PORT_MDB:
212 return sizeof(struct switchdev_obj_port_mdb);
213 case SWITCHDEV_OBJ_ID_HOST_MDB:
214 return sizeof(struct switchdev_obj_port_mdb);
215 default:
216 BUG();
217 }
218 return 0;
219}
220
221static int switchdev_port_obj_notify(enum switchdev_notifier_type nt,
222 struct net_device *dev,
223 const struct switchdev_obj *obj,
224 struct switchdev_trans *trans,
225 struct netlink_ext_ack *extack)
226{
227 int rc;
228 int err;
229
230 struct switchdev_notifier_port_obj_info obj_info = {
231 .obj = obj,
232 .trans = trans,
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 int switchdev_port_obj_add_now(struct net_device *dev,
248 const struct switchdev_obj *obj,
249 struct netlink_ext_ack *extack)
250{
251 struct switchdev_trans trans;
252 int err;
253
254 ASSERT_RTNL();
255
256 /* Phase I: prepare for obj add. Driver/device should fail
257 * here if there are going to be issues in the commit phase,
258 * such as lack of resources or support. The driver/device
259 * should reserve resources needed for the commit phase here,
260 * but should not commit the obj.
261 */
262
263 trans.ph_prepare = true;
264 err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
265 dev, obj, &trans, extack);
266 if (err)
267 return err;
268
269 /* Phase II: commit obj add. This cannot fail as a fault
270 * of driver/device. If it does, it's a bug in the driver/device
271 * because the driver said everythings was OK in phase I.
272 */
273
274 trans.ph_prepare = false;
275 err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
276 dev, obj, &trans, extack);
277 WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
278
279 return err;
280}
281
282static void switchdev_port_obj_add_deferred(struct net_device *dev,
283 const void *data)
284{
285 const struct switchdev_obj *obj = data;
286 int err;
287
288 err = switchdev_port_obj_add_now(dev, obj, NULL);
289 if (err && err != -EOPNOTSUPP)
290 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
291 err, obj->id);
292 if (obj->complete)
293 obj->complete(dev, err, obj->complete_priv);
294}
295
296static int switchdev_port_obj_add_defer(struct net_device *dev,
297 const struct switchdev_obj *obj)
298{
299 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
300 switchdev_port_obj_add_deferred);
301}
302
303/**
304 * switchdev_port_obj_add - Add port object
305 *
306 * @dev: port device
307 * @id: object ID
308 * @obj: object to add
309 *
310 * Use a 2-phase prepare-commit transaction model to ensure
311 * system is not left in a partially updated state due to
312 * failure from driver/device.
313 *
314 * rtnl_lock must be held and must not be in atomic section,
315 * in case SWITCHDEV_F_DEFER flag is not set.
316 */
317int switchdev_port_obj_add(struct net_device *dev,
318 const struct switchdev_obj *obj,
319 struct netlink_ext_ack *extack)
320{
321 if (obj->flags & SWITCHDEV_F_DEFER)
322 return switchdev_port_obj_add_defer(dev, obj);
323 ASSERT_RTNL();
324 return switchdev_port_obj_add_now(dev, obj, extack);
325}
326EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
327
328static int switchdev_port_obj_del_now(struct net_device *dev,
329 const struct switchdev_obj *obj)
330{
331 return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_DEL,
332 dev, obj, NULL, NULL);
333}
334
335static void switchdev_port_obj_del_deferred(struct net_device *dev,
336 const void *data)
337{
338 const struct switchdev_obj *obj = data;
339 int err;
340
341 err = switchdev_port_obj_del_now(dev, obj);
342 if (err && err != -EOPNOTSUPP)
343 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
344 err, obj->id);
345 if (obj->complete)
346 obj->complete(dev, err, obj->complete_priv);
347}
348
349static int switchdev_port_obj_del_defer(struct net_device *dev,
350 const struct switchdev_obj *obj)
351{
352 return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
353 switchdev_port_obj_del_deferred);
354}
355
356/**
357 * switchdev_port_obj_del - Delete port object
358 *
359 * @dev: port device
360 * @id: object ID
361 * @obj: object to delete
362 *
363 * rtnl_lock must be held and must not be in atomic section,
364 * in case SWITCHDEV_F_DEFER flag is not set.
365 */
366int switchdev_port_obj_del(struct net_device *dev,
367 const struct switchdev_obj *obj)
368{
369 if (obj->flags & SWITCHDEV_F_DEFER)
370 return switchdev_port_obj_del_defer(dev, obj);
371 ASSERT_RTNL();
372 return switchdev_port_obj_del_now(dev, obj);
373}
374EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
375
376static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
377static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain);
378
379/**
380 * register_switchdev_notifier - Register notifier
381 * @nb: notifier_block
382 *
383 * Register switch device notifier.
384 */
385int register_switchdev_notifier(struct notifier_block *nb)
386{
387 return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
388}
389EXPORT_SYMBOL_GPL(register_switchdev_notifier);
390
391/**
392 * unregister_switchdev_notifier - Unregister notifier
393 * @nb: notifier_block
394 *
395 * Unregister switch device notifier.
396 */
397int unregister_switchdev_notifier(struct notifier_block *nb)
398{
399 return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
400}
401EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
402
403/**
404 * call_switchdev_notifiers - Call notifiers
405 * @val: value passed unmodified to notifier function
406 * @dev: port device
407 * @info: notifier information data
408 *
409 * Call all network notifier blocks.
410 */
411int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
412 struct switchdev_notifier_info *info,
413 struct netlink_ext_ack *extack)
414{
415 info->dev = dev;
416 info->extack = extack;
417 return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
418}
419EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
420
421int register_switchdev_blocking_notifier(struct notifier_block *nb)
422{
423 struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
424
425 return blocking_notifier_chain_register(chain, nb);
426}
427EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier);
428
429int unregister_switchdev_blocking_notifier(struct notifier_block *nb)
430{
431 struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
432
433 return blocking_notifier_chain_unregister(chain, nb);
434}
435EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier);
436
437int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
438 struct switchdev_notifier_info *info,
439 struct netlink_ext_ack *extack)
440{
441 info->dev = dev;
442 info->extack = extack;
443 return blocking_notifier_call_chain(&switchdev_blocking_notif_chain,
444 val, info);
445}
446EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers);
447
448static int __switchdev_handle_port_obj_add(struct net_device *dev,
449 struct switchdev_notifier_port_obj_info *port_obj_info,
450 bool (*check_cb)(const struct net_device *dev),
451 int (*add_cb)(struct net_device *dev,
452 const struct switchdev_obj *obj,
453 struct switchdev_trans *trans,
454 struct netlink_ext_ack *extack))
455{
456 struct netlink_ext_ack *extack;
457 struct net_device *lower_dev;
458 struct list_head *iter;
459 int err = -EOPNOTSUPP;
460
461 extack = switchdev_notifier_info_to_extack(&port_obj_info->info);
462
463 if (check_cb(dev)) {
464 /* This flag is only checked if the return value is success. */
465 port_obj_info->handled = true;
466 return add_cb(dev, port_obj_info->obj, port_obj_info->trans,
467 extack);
468 }
469
470 /* Switch ports might be stacked under e.g. a LAG. Ignore the
471 * unsupported devices, another driver might be able to handle them. But
472 * propagate to the callers any hard errors.
473 *
474 * If the driver does its own bookkeeping of stacked ports, it's not
475 * necessary to go through this helper.
476 */
477 netdev_for_each_lower_dev(dev, lower_dev, iter) {
478 err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
479 check_cb, add_cb);
480 if (err && err != -EOPNOTSUPP)
481 return err;
482 }
483
484 return err;
485}
486
487int switchdev_handle_port_obj_add(struct net_device *dev,
488 struct switchdev_notifier_port_obj_info *port_obj_info,
489 bool (*check_cb)(const struct net_device *dev),
490 int (*add_cb)(struct net_device *dev,
491 const struct switchdev_obj *obj,
492 struct switchdev_trans *trans,
493 struct netlink_ext_ack *extack))
494{
495 int err;
496
497 err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
498 add_cb);
499 if (err == -EOPNOTSUPP)
500 err = 0;
501 return err;
502}
503EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
504
505static int __switchdev_handle_port_obj_del(struct net_device *dev,
506 struct switchdev_notifier_port_obj_info *port_obj_info,
507 bool (*check_cb)(const struct net_device *dev),
508 int (*del_cb)(struct net_device *dev,
509 const struct switchdev_obj *obj))
510{
511 struct net_device *lower_dev;
512 struct list_head *iter;
513 int err = -EOPNOTSUPP;
514
515 if (check_cb(dev)) {
516 /* This flag is only checked if the return value is success. */
517 port_obj_info->handled = true;
518 return del_cb(dev, port_obj_info->obj);
519 }
520
521 /* Switch ports might be stacked under e.g. a LAG. Ignore the
522 * unsupported devices, another driver might be able to handle them. But
523 * propagate to the callers any hard errors.
524 *
525 * If the driver does its own bookkeeping of stacked ports, it's not
526 * necessary to go through this helper.
527 */
528 netdev_for_each_lower_dev(dev, lower_dev, iter) {
529 err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
530 check_cb, del_cb);
531 if (err && err != -EOPNOTSUPP)
532 return err;
533 }
534
535 return err;
536}
537
538int switchdev_handle_port_obj_del(struct net_device *dev,
539 struct switchdev_notifier_port_obj_info *port_obj_info,
540 bool (*check_cb)(const struct net_device *dev),
541 int (*del_cb)(struct net_device *dev,
542 const struct switchdev_obj *obj))
543{
544 int err;
545
546 err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
547 del_cb);
548 if (err == -EOPNOTSUPP)
549 err = 0;
550 return err;
551}
552EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
553
554static int __switchdev_handle_port_attr_set(struct net_device *dev,
555 struct switchdev_notifier_port_attr_info *port_attr_info,
556 bool (*check_cb)(const struct net_device *dev),
557 int (*set_cb)(struct net_device *dev,
558 const struct switchdev_attr *attr,
559 struct switchdev_trans *trans))
560{
561 struct net_device *lower_dev;
562 struct list_head *iter;
563 int err = -EOPNOTSUPP;
564
565 if (check_cb(dev)) {
566 port_attr_info->handled = true;
567 return set_cb(dev, port_attr_info->attr,
568 port_attr_info->trans);
569 }
570
571 /* Switch ports might be stacked under e.g. a LAG. Ignore the
572 * unsupported devices, another driver might be able to handle them. But
573 * propagate to the callers any hard errors.
574 *
575 * If the driver does its own bookkeeping of stacked ports, it's not
576 * necessary to go through this helper.
577 */
578 netdev_for_each_lower_dev(dev, lower_dev, iter) {
579 err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
580 check_cb, set_cb);
581 if (err && err != -EOPNOTSUPP)
582 return err;
583 }
584
585 return err;
586}
587
588int switchdev_handle_port_attr_set(struct net_device *dev,
589 struct switchdev_notifier_port_attr_info *port_attr_info,
590 bool (*check_cb)(const struct net_device *dev),
591 int (*set_cb)(struct net_device *dev,
592 const struct switchdev_attr *attr,
593 struct switchdev_trans *trans))
594{
595 int err;
596
597 err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb,
598 set_cb);
599 if (err == -EOPNOTSUPP)
600 err = 0;
601 return err;
602}
603EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set);