summaryrefslogtreecommitdiffstats
path: root/net/bridge/br_switchdev.c
blob: 7b41ee8740cbbaf6b959d9273c49ebcd4830a5c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <net/switchdev.h>

#include "br_private.h"

static struct static_key_false br_switchdev_tx_fwd_offload;

static bool nbp_switchdev_can_offload_tx_fwd(const struct net_bridge_port *p,
					     const struct sk_buff *skb)
{
	if (!static_branch_unlikely(&br_switchdev_tx_fwd_offload))
		return false;

	return (p->flags & BR_TX_FWD_OFFLOAD) &&
	       (p->hwdom != BR_INPUT_SKB_CB(skb)->src_hwdom);
}

bool br_switchdev_frame_uses_tx_fwd_offload(struct sk_buff *skb)
{
	if (!static_branch_unlikely(&br_switchdev_tx_fwd_offload))
		return false;

	return BR_INPUT_SKB_CB(skb)->tx_fwd_offload;
}

void br_switchdev_frame_set_offload_fwd_mark(struct sk_buff *skb)
{
	skb->offload_fwd_mark = br_switchdev_frame_uses_tx_fwd_offload(skb);
}

/* Mark the frame for TX forwarding offload if this egress port supports it */
void nbp_switchdev_frame_mark_tx_fwd_offload(const struct net_bridge_port *p,
					     struct sk_buff *skb)
{
	if (nbp_switchdev_can_offload_tx_fwd(p, skb))
		BR_INPUT_SKB_CB(skb)->tx_fwd_offload = true;
}

/* Lazily adds the hwdom of the egress bridge port to the bit mask of hwdoms
 * that the skb has been already forwarded to, to avoid further cloning to
 * other ports in the same hwdom by making nbp_switchdev_allowed_egress()
 * return false.
 */
void nbp_switchdev_frame_mark_tx_fwd_to_hwdom(const struct net_bridge_port *p,
					      struct sk_buff *skb)
{
	if (nbp_switchdev_can_offload_tx_fwd(p, skb))
		set_bit(p->hwdom, &BR_INPUT_SKB_CB(skb)->fwd_hwdoms);
}

void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
			      struct sk_buff *skb)
{
	if (p->hwdom)
		BR_INPUT_SKB_CB(skb)->src_hwdom = p->hwdom;
}

bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
				  const struct sk_buff *skb)
{
	struct br_input_skb_cb *cb = BR_INPUT_SKB_CB(skb);

	return !test_bit(p->hwdom, &cb->fwd_hwdoms) &&
		(!skb->offload_fwd_mark || cb->src_hwdom != p->hwdom);
}

/* Flags that can be offloaded to hardware */
#define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | BR_PORT_MAB | \
				  BR_MCAST_FLOOD | BR_BCAST_FLOOD | BR_PORT_LOCKED | \
				  BR_HAIRPIN_MODE | BR_ISOLATED | BR_MULTICAST_TO_UNICAST)

int br_switchdev_set_port_flag(struct net_bridge_port *p,
			       unsigned long flags,
			       unsigned long mask,
			       struct netlink_ext_ack *extack)
{
	struct switchdev_attr attr = {
		.orig_dev = p->dev,
	};
	struct switchdev_notifier_port_attr_info info = {
		.attr = &attr,
	};
	int err;

	mask &= BR_PORT_FLAGS_HW_OFFLOAD;
	if (!mask)
		return 0;

	attr.id = SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS;
	attr.u.brport_flags.val = flags;
	attr.u.brport_flags.mask = mask;

	/* We run from atomic context here */
	err = call_switchdev_notifiers(SWITCHDEV_PORT_ATTR_SET, p->dev,
				       &info.info, extack);
	err = notifier_to_errno(err);
	if (err == -EOPNOTSUPP)
		return 0;

	if (err) {
		NL_SET_ERR_MSG_WEAK_MOD(extack,
					"bridge flag offload is not supported");
		return -EOPNOTSUPP;
	}

	attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
	attr.flags = SWITCHDEV_F_DEFER;

	err = switchdev_port_attr_set(p->dev, &attr, extack);
	if (err) {
		NL_SET_ERR_MSG_WEAK_MOD(extack,
					"error setting offload flag on port");
		return err;
	}

	return 0;
}

static void br_switchdev_fdb_populate(struct net_bridge *br,
				      struct switchdev_notifier_fdb_info *item,
				      const struct net_bridge_fdb_entry *fdb,
				      const void *ctx)
{
	const struct net_bridge_port *p = READ_ONCE(fdb->dst);

	item->addr = fdb->key.addr.addr;
	item->vid = fdb->key.vlan_id;
	item->added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
	item->offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags);
	item->is_local = test_bit(BR_FDB_LOCAL, &fdb->flags);
	item->locked = false;
	item->info.dev = (!p || item->is_local) ? br->dev : p->dev;
	item->info.ctx = ctx;
}

void
br_switchdev_fdb_notify(struct net_bridge *br,
			const struct net_bridge_fdb_entry *fdb, int type)
{
	struct switchdev_notifier_fdb_info item;

	if (test_bit(BR_FDB_LOCKED, &fdb->flags))
		return;

	/* Entries with these flags were created using ndm_state == NUD_REACHABLE,
	 * ndm_flags == NTF_MASTER( | NTF_STICKY), ext_flags == 0 by something
	 * equivalent to 'bridge fdb add ... master dynamic (sticky)'.
	 * Drivers don't know how to deal with these, so don't notify them to
	 * avoid confusing them.
	 */
	if (test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags) &&
	    !test_bit(BR_FDB_STATIC, &fdb->flags) &&
	    !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
		return;

	br_switchdev_fdb_populate(br, &item, fdb, NULL);

	switch (type) {
	case RTM_DELNEIGH:
		call_switchdev_notifiers(SWITCHDEV_FDB_DEL_TO_DEVICE,
					 item.info.dev, &item.info, NULL);
		break;
	case RTM_NEWNEIGH:
		call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_DEVICE,
					 item.info.dev, &item.info, NULL);
		break;
	}
}

int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
			       bool changed, struct netlink_ext_ack *extack)
{
	struct switchdev_obj_port_vlan v = {
		.obj.orig_dev = dev,
		.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
		.flags = flags,
		.vid = vid,
		.changed = changed,
	};

	return switchdev_port_obj_add(dev, &v.obj, extack);
}

int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
{
	struct switchdev_obj_port_vlan v = {
		.obj.orig_dev = dev,
		.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
		.vid = vid,
	};

	return switchdev_port_obj_del(dev, &v.obj);
}

static int nbp_switchdev_hwdom_set(struct net_bridge_port *joining)
{
	struct net_bridge *br = joining->br;
	struct net_bridge_port *p;
	int hwdom;

	/* joining is yet to be added to the port list. */
	list_for_each_entry(p, &br->port_list, list) {
		if (netdev_phys_item_id_same(&joining->ppid, &p->ppid)) {
			joining->hwdom = p->hwdom;
			return 0;
		}
	}

	hwdom = find_next_zero_bit(&br->busy_hwdoms, BR_HWDOM_MAX, 1);
	if (hwdom >= BR_HWDOM_MAX)
		return -EBUSY;

	set_bit(hwdom, &br->busy_hwdoms);
	joining->hwdom = hwdom;
	return 0;
}

static void nbp_switchdev_hwdom_put(struct net_bridge_port *leaving)
{
	struct net_bridge *br = leaving->br;
	struct net_bridge_port *p;

	/* leaving is no longer in the port list. */
	list_for_each_entry(p, &br->port_list, list) {
		if (p->hwdom == leaving->hwdom)
			return;
	}

	clear_bit(leaving->hwdom, &br->busy_hwdoms);
}

static int nbp_switchdev_add(struct net_bridge_port *p,
			     struct netdev_phys_item_id ppid,
			     bool tx_fwd_offload,
			     struct netlink_ext_ack *extack)
{
	int err;

	if (p->offload_count) {
		/* Prevent unsupported configurations such as a bridge port
		 * which is a bonding interface, and the member ports are from
		 * different hardware switches.
		 */
		if (!netdev_phys_item_id_same(&p->ppid, &ppid)) {
			NL_SET_ERR_MSG_MOD(extack,
					   "Same bridge port cannot be offloaded by two physical switches");
			return -EBUSY;
		}

		/* Tolerate drivers that call switchdev_bridge_port_offload()
		 * more than once for the same bridge port, such as when the
		 * bridge port is an offloaded bonding/team interface.
		 */
		p->offload_count++;

		return 0;
	}

	p->ppid = ppid;
	p->offload_count = 1;

	err = nbp_switchdev_hwdom_set(p);
	if (err)
		return err;

	if (tx_fwd_offload) {
		p->flags |= BR_TX_FWD_OFFLOAD;
		static_branch_inc(&br_switchdev_tx_fwd_offload);
	}

	return 0;
}

static void nbp_switchdev_del(struct net_bridge_port *p)
{
	if (WARN_ON(!p->offload_count))
		return;

	p->offload_count--;

	if (p->offload_count)
		return;

	if (p->hwdom)
		nbp_switchdev_hwdom_put(p);

	if (p->flags & BR_TX_FWD_OFFLOAD) {
		p->flags &= ~BR_TX_FWD_OFFLOAD;
		static_branch_dec(&br_switchdev_tx_fwd_offload);
	}
}

static int
br_switchdev_fdb_replay_one(struct net_bridge *br, struct notifier_block *nb,
			    const struct net_bridge_fdb_entry *fdb,
			    unsigned long action, const void *ctx)
{
	struct switchdev_notifier_fdb_info item;
	int err;

	br_switchdev_fdb_populate(br, &item, fdb, ctx);

	err = nb->notifier_call(nb, action, &item);
	return notifier_to_errno(err);
}

static int
br_switchdev_fdb_replay(const struct net_device *br_dev, const void *ctx,
			bool adding, struct notifier_block *nb)
{
	struct net_bridge_fdb_entry *fdb;
	struct net_bridge *br;
	unsigned long action;
	int err = 0;

	if (!nb)
		return 0;

	if (!netif_is_bridge_master(br_dev))
		return -EINVAL;

	br = netdev_priv(br_dev);

	if (adding)
		action = SWITCHDEV_FDB_ADD_TO_DEVICE;
	else
		action = SWITCHDEV_FDB_DEL_TO_DEVICE;

	rcu_read_lock();

	hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) {
		err = br_switchdev_fdb_replay_one(br, nb, fdb, action, ctx);
		if (err)
			break;
	}

	rcu_read_unlock();

	return err;
}

static int br_switchdev_vlan_attr_replay(struct net_device *br_dev,
					 const void *ctx,
					 struct notifier_block *nb,
					 struct netlink_ext_ack *extack)
{
	struct switchdev_notifier_port_attr_info attr_info = {
		.info = {
			.dev = br_dev,
			.extack = extack,
			.ctx = ctx,
		},
	};
	struct net_bridge *br = netdev_priv(br_dev);
	struct net_bridge_vlan_group *vg;
	struct switchdev_attr attr;
	struct net_bridge_vlan *v;
	int err;

	attr_info.attr = &attr;
	attr.orig_dev = br_dev;

	vg = br_vlan_group(br);
	if (!vg)
		return 0;

	list_for_each_entry(v, &vg->vlan_list, vlist) {
		if (v->msti) {
			attr.id = SWITCHDEV_ATTR_ID_VLAN_MSTI;
			attr.u.vlan_msti.vid = v->vid;
			attr.u.vlan_msti.msti = v->msti;

			err = nb->notifier_call(nb, SWITCHDEV_PORT_ATTR_SET,
						&attr_info);
			err = notifier_to_errno(err);
			if (err)
				return err;
		}
	}

	return 0;
}

static int
br_switchdev_vlan_replay_one(struct notifier_block *nb,
			     struct net_device *dev,
			     struct switchdev_obj_port_vlan *vlan,
			     const void *ctx, unsigned long action,
			     struct netlink_ext_ack *extack)
{
	struct switchdev_notifier_port_obj_info obj_info = {
		.info = {
			.dev = dev,
			.extack = extack,
			.ctx = ctx,
		},
		.obj = &vlan->obj,
	};
	int err;

	err = nb->notifier_call(nb, action, &obj_info);
	return notifier_to_errno(err);
}

static int br_switchdev_vlan_replay_group(struct notifier_block *nb,
					  struct net_device *dev,
					  struct net_bridge_vlan_group *vg,
					  const void *ctx, unsigned long action,
					  struct netlink_ext_ack *extack)
{
	struct net_bridge_vlan *v;
	int err = 0;
	u16 pvid;

	if (!vg)
		return 0;

	pvid = br_get_pvid(vg);

	list_for_each_entry(v, &vg->vlan_list, vlist) {
		struct switchdev_obj_port_vlan vlan = {
			.obj.orig_dev = dev,
			.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
			.flags = br_vlan_flags(v, pvid),
			.vid = v->vid,
		};

		if (!br_vlan_should_use(v))
			continue;

		err = br_switchdev_vlan_replay_one(nb, dev, &vlan, ctx,
						   action, extack);
		if (err)
			return err;
	}

	return 0;
}

static int br_switchdev_vlan_replay(struct net_device *br_dev,
				    const void *ctx, bool adding,
				    struct notifier_block *nb,
				    struct netlink_ext_ack *extack)
{
	struct net_bridge *br = netdev_priv(br_dev);
	struct net_bridge_port *p;
	unsigned long action;
	int err;

	ASSERT_RTNL();

	if (!nb)
		return 0;

	if (!netif_is_bridge_master(br_dev))
		return -EINVAL;

	if (adding)
		action = SWITCHDEV_PORT_OBJ_ADD;
	else
		action = SWITCHDEV_PORT_OBJ_DEL;

	err = br_switchdev_vlan_replay_group(nb, br_dev, br_vlan_group(br),
					     ctx, action, extack);
	if (err)
		return err;

	list_for_each_entry(p, &br->port_list, list) {
		struct net_device *dev = p->dev;

		err = br_switchdev_vlan_replay_group(nb, dev,
						     nbp_vlan_group(p),
						     ctx, action, extack);
		if (err)
			return err;
	}

	if (adding) {
		err = br_switchdev_vlan_attr_replay(br_dev, ctx, nb, extack);
		if (err)
			return err;
	}

	return 0;
}

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
struct br_switchdev_mdb_complete_info {
	struct net_bridge_port *port;
	struct br_ip ip;
};

static void br_switchdev_mdb_complete(struct net_device *dev, int err, void *priv)
{
	struct br_switchdev_mdb_complete_info *data = priv;
	struct net_bridge_port_group __rcu **pp;
	struct net_bridge_port_group *p;
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port *port = data->port;
	struct net_bridge *br = port->br;

	if (err)
		goto err;

	spin_lock_bh(&br->multicast_lock);
	mp = br_mdb_ip_get(br, &data->ip);
	if (!mp)
		goto out;
	for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
		if (p->key.port != port)
			continue;
		p->flags |= MDB_PG_FLAGS_OFFLOAD;
	}
out:
	spin_unlock_bh(&br->multicast_lock);
err:
	kfree(priv);
}

static void br_switchdev_mdb_populate(struct switchdev_obj_port_mdb *mdb,
				      const struct net_bridge_mdb_entry *mp)
{
	if (mp->addr.proto == htons(ETH_P_IP))
		ip_eth_mc_map(mp->addr.dst.ip4, mdb->addr);
#if IS_ENABLED(CONFIG_IPV6)
	else if (mp->addr.proto == htons(ETH_P_IPV6))
		ipv6_eth_mc_map(&mp->addr.dst.ip6, mdb->addr);
#endif
	else
		ether_addr_copy(mdb->addr, mp->addr.dst.mac_addr);

	mdb->vid = mp->addr.vid;
}

static void br_switchdev_host_mdb_one(struct net_device *dev,
				      struct net_device *lower_dev,
				      struct net_bridge_mdb_entry *mp,
				      int type)
{
	struct switchdev_obj_port_mdb mdb = {
		.obj = {
			.id = SWITCHDEV_OBJ_ID_HOST_MDB,
			.flags = SWITCHDEV_F_DEFER,
			.orig_dev = dev,
		},
	};

	br_switchdev_mdb_populate(&mdb, mp);

	switch (type) {
	case RTM_NEWMDB:
		switchdev_port_obj_add(lower_dev, &mdb.obj, NULL);
		break;
	case RTM_DELMDB:
		switchdev_port_obj_del(lower_dev, &mdb.obj);
		break;
	}
}

static void br_switchdev_host_mdb(struct net_device *dev,
				  struct net_bridge_mdb_entry *mp, int type)
{
	struct net_device *lower_dev;
	struct list_head *iter;

	netdev_for_each_lower_dev(dev, lower_dev, iter)
		br_switchdev_host_mdb_one(dev, lower_dev, mp, type);
}

static int
br_switchdev_mdb_replay_one(struct notifier_block *nb, struct net_device *dev,
			    const struct switchdev_obj_port_mdb *mdb,
			    unsigned long action, const void *ctx,
			    struct netlink_ext_ack *extack)
{
	struct switchdev_notifier_port_obj_info obj_info = {
		.info = {
			.dev = dev,
			.extack = extack,
			.ctx = ctx,
		},
		.obj = &mdb->obj,
	};
	int err;

	err = nb->notifier_call(nb, action, &obj_info);
	return notifier_to_errno(err);
}

static int br_switchdev_mdb_queue_one(struct list_head *mdb_list,
				      struct net_device *dev,
				      unsigned long action,
				      enum switchdev_obj_id id,
				      const struct net_bridge_mdb_entry *mp,
				      struct net_device *orig_dev)
{
	struct switchdev_obj_port_mdb mdb = {
		.obj = {
			.id = id,
			.orig_dev = orig_dev,
		},
	};
	struct switchdev_obj_port_mdb *pmdb;

	br_switchdev_mdb_populate(&mdb, mp);

	if (action == SWITCHDEV_PORT_OBJ_ADD &&
	    switchdev_port_obj_act_is_deferred(dev, action, &mdb.obj)) {
		/* This event is already in the deferred queue of
		 * events, so this replay must be elided, lest the
		 * driver receives duplicate events for it. This can
		 * only happen when replaying additions, since
		 * modifications are always immediately visible in
		 * br->mdb_list, whereas actual event delivery may be
		 * delayed.
		 */
		return 0;
	}

	pmdb = kmemdup(&mdb, sizeof(mdb), GFP_ATOMIC);
	if (!pmdb)
		return -ENOMEM;

	list_add_tail(&pmdb->obj.list, mdb_list);
	return 0;
}

void br_switchdev_mdb_notify(struct net_device *dev,
			     struct net_bridge_mdb_entry *mp,
			     struct net_bridge_port_group *pg,
			     int type)
{
	struct br_switchdev_mdb_complete_info *complete_info;
	struct switchdev_obj_port_mdb mdb = {
		.obj = {
			.id = SWITCHDEV_OBJ_ID_PORT_MDB,
			.flags = SWITCHDEV_F_DEFER,
		},
	};

	if (!pg)
		return br_switchdev_host_mdb(dev, mp, type);

	br_switchdev_mdb_populate(&mdb, mp);

	mdb.obj.orig_dev = pg->key.port->dev;
	switch (type) {
	case RTM_NEWMDB:
		complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
		if (!complete_info)
			break;
		complete_info->port = pg->key.port;
		complete_info->ip = mp->addr;
		mdb.obj.complete_priv = complete_info;
		mdb.obj.complete = br_switchdev_mdb_complete;
		if (switchdev_port_obj_add(pg->key.port->dev, &mdb.obj, NULL))
			kfree(complete_info);
		break;
	case RTM_DELMDB:
		switchdev_port_obj_del(pg->key.port->dev, &mdb.obj);
		break;
	}
}
#endif

static int
br_switchdev_mdb_replay(struct net_device *br_dev, struct net_device *dev,
			const void *ctx, bool adding, struct notifier_block *nb,
			struct netlink_ext_ack *extack)
{
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	const struct net_bridge_mdb_entry *mp;
	struct switchdev_obj *obj, *tmp;
	struct net_bridge *br;
	unsigned long action;
	LIST_HEAD(mdb_list);
	int err = 0;

	ASSERT_RTNL();

	if (!nb)
		return 0;

	if (!netif_is_bridge_master(br_dev) || !netif_is_bridge_port(dev))
		return -EINVAL;

	br = netdev_priv(br_dev);

	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
		return 0;

	if (adding)
		action = SWITCHDEV_PORT_OBJ_ADD;
	else
		action = SWITCHDEV_PORT_OBJ_DEL;

	/* br_switchdev_mdb_queue_one() will take care to not queue a
	 * replay of an event that is already pending in the switchdev
	 * deferred queue. In order to safely determine that, there
	 * must be no new deferred MDB notifications enqueued for the
	 * duration of the MDB scan. Therefore, grab the write-side
	 * lock to avoid racing with any concurrent IGMP/MLD snooping.
	 */
	spin_lock_bh(&br->multicast_lock);

	hlist_for_each_entry(mp, &br->mdb_list, mdb_node) {
		struct net_bridge_port_group __rcu * const *pp;
		const struct net_bridge_port_group *p;

		if (mp->host_joined) {
			err = br_switchdev_mdb_queue_one(&mdb_list, dev, action,
							 SWITCHDEV_OBJ_ID_HOST_MDB,
							 mp, br_dev);
			if (err) {
				spin_unlock_bh(&br->multicast_lock);
				goto out_free_mdb;
			}
		}

		for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
		     pp = &p->next) {
			if (p->key.port->dev != dev)
				continue;

			err = br_switchdev_mdb_queue_one(&mdb_list, dev, action,
							 SWITCHDEV_OBJ_ID_PORT_MDB,
							 mp, dev);
			if (err) {
				spin_unlock_bh(&br->multicast_lock);
				goto out_free_mdb;
			}
		}
	}

	spin_unlock_bh(&br->multicast_lock);

	list_for_each_entry(obj, &mdb_list, list) {
		err = br_switchdev_mdb_replay_one(nb, dev,
						  SWITCHDEV_OBJ_PORT_MDB(obj),
						  action, ctx, extack);
		if (err == -EOPNOTSUPP)
			err = 0;
		if (err)
			goto out_free_mdb;
	}

out_free_mdb:
	list_for_each_entry_safe(obj, tmp, &mdb_list, list) {
		list_del(&obj->list);
		kfree(SWITCHDEV_OBJ_PORT_MDB(obj));
	}

	if (err)
		return err;
#endif

	return 0;
}

static int nbp_switchdev_sync_objs(struct net_bridge_port *p, const void *ctx,
				   struct notifier_block *atomic_nb,
				   struct notifier_block *blocking_nb,
				   struct netlink_ext_ack *extack)
{
	struct net_device *br_dev = p->br->dev;
	struct net_device *dev = p->dev;
	int err;

	err = br_switchdev_vlan_replay(br_dev, ctx, true, blocking_nb, extack);
	if (err && err != -EOPNOTSUPP)
		return err;

	err = br_switchdev_mdb_replay(br_dev, dev, ctx, true, blocking_nb,
				      extack);
	if (err) {
		/* -EOPNOTSUPP not propagated from MDB replay. */
		return err;
	}

	err = br_switchdev_fdb_replay(br_dev, ctx, true, atomic_nb);
	if (err && err != -EOPNOTSUPP)
		return err;

	return 0;
}

static void nbp_switchdev_unsync_objs(struct net_bridge_port *p,
				      const void *ctx,
				      struct notifier_block *atomic_nb,
				      struct notifier_block *blocking_nb)
{
	struct net_device *br_dev = p->br->dev;
	struct net_device *dev = p->dev;

	br_switchdev_fdb_replay(br_dev, ctx, false, atomic_nb);

	br_switchdev_mdb_replay(br_dev, dev, ctx, false, blocking_nb, NULL);

	br_switchdev_vlan_replay(br_dev, ctx, false, blocking_nb, NULL);

	/* Make sure that the device leaving this bridge has seen all
	 * relevant events before it is disassociated. In the normal
	 * case, when the device is directly attached to the bridge,
	 * this is covered by del_nbp(). If the association was indirect
	 * however, e.g. via a team or bond, and the device is leaving
	 * that intermediate device, then the bridge port remains in
	 * place.
	 */
	switchdev_deferred_process();
}

/* Let the bridge know that this port is offloaded, so that it can assign a
 * switchdev hardware domain to it.
 */
int br_switchdev_port_offload(struct net_bridge_port *p,
			      struct net_device *dev, const void *ctx,
			      struct notifier_block *atomic_nb,
			      struct notifier_block *blocking_nb,
			      bool tx_fwd_offload,
			      struct netlink_ext_ack *extack)
{
	struct netdev_phys_item_id ppid;
	int err;

	err = dev_get_port_parent_id(dev, &ppid, false);
	if (err)
		return err;

	err = nbp_switchdev_add(p, ppid, tx_fwd_offload, extack);
	if (err)
		return err;

	err = nbp_switchdev_sync_objs(p, ctx, atomic_nb, blocking_nb, extack);
	if (err)
		goto out_switchdev_del;

	return 0;

out_switchdev_del:
	nbp_switchdev_del(p);

	return err;
}

void br_switchdev_port_unoffload(struct net_bridge_port *p, const void *ctx,
				 struct notifier_block *atomic_nb,
				 struct notifier_block *blocking_nb)
{
	nbp_switchdev_unsync_objs(p, ctx, atomic_nb, blocking_nb);

	nbp_switchdev_del(p);
}

int br_switchdev_port_replay(struct net_bridge_port *p,
			     struct net_device *dev, const void *ctx,
			     struct notifier_block *atomic_nb,
			     struct notifier_block *blocking_nb,
			     struct netlink_ext_ack *extack)
{
	return nbp_switchdev_sync_objs(p, ctx, atomic_nb, blocking_nb, extack);
}