1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/list.h>
4 #include <linux/netdevice.h>
5 #include <linux/rtnetlink.h>
6 #include <linux/skbuff.h>
7 #include <net/ip.h>
8 #include <net/switchdev.h>
9
10 #include "br_private.h"
11
12 static struct static_key_false br_switchdev_tx_fwd_offload;
13
14 static bool nbp_switchdev_can_offload_tx_fwd(const struct net_bridge_port *p,
15 const struct sk_buff *skb)
16 {
17 if (!static_branch_unlikely(&br_switchdev_tx_fwd_offload))
18 return false;
19
20 return (p->flags & BR_TX_FWD_OFFLOAD) &&
21 (p->hwdom != BR_INPUT_SKB_CB(skb)->src_hwdom);
22 }
23
24 bool br_switchdev_frame_uses_tx_fwd_offload(struct sk_buff *skb)
25 {
26 if (!static_branch_unlikely(&br_switchdev_tx_fwd_offload))
27 return false;
28
29 return BR_INPUT_SKB_CB(skb)->tx_fwd_offload;
30 }
31
32 void br_switchdev_frame_set_offload_fwd_mark(struct sk_buff *skb)
33 {
34 skb->offload_fwd_mark = br_switchdev_frame_uses_tx_fwd_offload(skb);
35 }
36
37 /* Mark the frame for TX forwarding offload if this egress port supports it */
38 void nbp_switchdev_frame_mark_tx_fwd_offload(const struct net_bridge_port *p,
39 struct sk_buff *skb)
40 {
41 if (nbp_switchdev_can_offload_tx_fwd(p, skb))
42 BR_INPUT_SKB_CB(skb)->tx_fwd_offload = true;
43 }
44
45 /* Lazily adds the hwdom of the egress bridge port to the bit mask of hwdoms
46 * that the skb has been already forwarded to, to avoid further cloning to
47 * other ports in the same hwdom by making nbp_switchdev_allowed_egress()
48 * return false.
49 */
50 void nbp_switchdev_frame_mark_tx_fwd_to_hwdom(const struct net_bridge_port *p,
51 struct sk_buff *skb)
52 {
53 if (nbp_switchdev_can_offload_tx_fwd(p, skb))
54 set_bit(p->hwdom, &BR_INPUT_SKB_CB(skb)->fwd_hwdoms);
55 }
56
57 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
58 struct sk_buff *skb)
59 {
60 if (p->hwdom)
61 BR_INPUT_SKB_CB(skb)->src_hwdom = p->hwdom;
62 }
63
64 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
65 const struct sk_buff *skb)
66 {
67 struct br_input_skb_cb *cb = BR_INPUT_SKB_CB(skb);
68
69 return !test_bit(p->hwdom, &cb->fwd_hwdoms) &&
70 (!skb->offload_fwd_mark || cb->src_hwdom != p->hwdom);
71 }
72
73 /* Flags that can be offloaded to hardware */
74 #define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | BR_PORT_MAB | \
75 BR_MCAST_FLOOD | BR_BCAST_FLOOD | BR_PORT_LOCKED | \
76 BR_HAIRPIN_MODE | BR_ISOLATED | BR_MULTICAST_TO_UNICAST)
77
78 int br_switchdev_set_port_flag(struct net_bridge_port *p,
79 unsigned long flags,
80 unsigned long mask,
81 struct netlink_ext_ack *extack)
82 {
83 struct switchdev_attr attr = {
84 .orig_dev = p->dev,
85 };
86 struct switchdev_notifier_port_attr_info info = {
87 .attr = &attr,
88 };
89 int err;
90
91 mask &= BR_PORT_FLAGS_HW_OFFLOAD;
92 if (!mask)
93 return 0;
94
95 attr.id = SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS;
96 attr.u.brport_flags.val = flags;
97 attr.u.brport_flags.mask = mask;
98
99 /* We run from atomic context here */
100 err = call_switchdev_notifiers(SWITCHDEV_PORT_ATTR_SET, p->dev,
101 &info.info, extack);
102 err = notifier_to_errno(err);
103 if (err == -EOPNOTSUPP)
104 return 0;
105
106 if (err) {
107 NL_SET_ERR_MSG_WEAK_MOD(extack,
108 "bridge flag offload is not supported");
109 return -EOPNOTSUPP;
110 }
111
112 attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
113 attr.flags = SWITCHDEV_F_DEFER;
114
115 err = switchdev_port_attr_set(p->dev, &attr, extack);
116 if (err) {
117 NL_SET_ERR_MSG_WEAK_MOD(extack,
118 "error setting offload flag on port");
119 return err;
120 }
121
122 return 0;
123 }
124
125 static void br_switchdev_fdb_populate(struct net_bridge *br,
126 struct switchdev_notifier_fdb_info *item,
127 const struct net_bridge_fdb_entry *fdb,
128 const void *ctx)
129 {
130 const struct net_bridge_port *p = READ_ONCE(fdb->dst);
131
132 item->addr = fdb->key.addr.addr;
133 item->vid = fdb->key.vlan_id;
134 item->added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
135 item->offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags);
136 item->is_local = test_bit(BR_FDB_LOCAL, &fdb->flags);
137 item->locked = false;
138 item->info.dev = (!p || item->is_local) ? br->dev : p->dev;
139 item->info.ctx = ctx;
140 }
141
142 void
143 br_switchdev_fdb_notify(struct net_bridge *br,
144 const struct net_bridge_fdb_entry *fdb, int type)
145 {
146 struct switchdev_notifier_fdb_info item;
147
148 if (test_bit(BR_FDB_LOCKED, &fdb->flags))
149 return;
150
151 /* Entries with these flags were created using ndm_state == NUD_REACHABLE,
152 * ndm_flags == NTF_MASTER( | NTF_STICKY), ext_flags == 0 by something
153 * equivalent to 'bridge fdb add ... master dynamic (sticky)'.
154 * Drivers don't know how to deal with these, so don't notify them to
155 * avoid confusing them.
156 */
157 if (test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags) &&
158 !test_bit(BR_FDB_STATIC, &fdb->flags) &&
159 !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
160 return;
161
162 br_switchdev_fdb_populate(br, &item, fdb, NULL);
163
164 switch (type) {
165 case RTM_DELNEIGH:
166 call_switchdev_notifiers(SWITCHDEV_FDB_DEL_TO_DEVICE,
167 item.info.dev, &item.info, NULL);
168 break;
169 case RTM_NEWNEIGH:
170 call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_DEVICE,
171 item.info.dev, &item.info, NULL);
172 break;
173 }
174 }
175
176 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
177 bool changed, struct netlink_ext_ack *extack)
178 {
179 struct switchdev_obj_port_vlan v = {
180 .obj.orig_dev = dev,
181 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
182 .flags = flags,
183 .vid = vid,
184 .changed = changed,
185 };
186
187 return switchdev_port_obj_add(dev, &v.obj, extack);
188 }
189
190 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
191 {
192 struct switchdev_obj_port_vlan v = {
193 .obj.orig_dev = dev,
194 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
195 .vid = vid,
196 };
197
198 return switchdev_port_obj_del(dev, &v.obj);
199 }
200
201 static int nbp_switchdev_hwdom_set(struct net_bridge_port *joining)
202 {
203 struct net_bridge *br = joining->br;
204 struct net_bridge_port *p;
205 int hwdom;
206
207 /* joining is yet to be added to the port list. */
208 list_for_each_entry(p, &br->port_list, list) {
209 if (netdev_phys_item_id_same(&joining->ppid, &p->ppid)) {
210 joining->hwdom = p->hwdom;
211 return 0;
212 }
213 }
214
215 hwdom = find_next_zero_bit(&br->busy_hwdoms, BR_HWDOM_MAX, 1);
216 if (hwdom >= BR_HWDOM_MAX)
217 return -EBUSY;
218
219 set_bit(hwdom, &br->busy_hwdoms);
220 joining->hwdom = hwdom;
221 return 0;
222 }
223
224 static void nbp_switchdev_hwdom_put(struct net_bridge_port *leaving)
225 {
226 struct net_bridge *br = leaving->br;
227 struct net_bridge_port *p;
228
229 /* leaving is no longer in the port list. */
230 list_for_each_entry(p, &br->port_list, list) {
231 if (p->hwdom == leaving->hwdom)
232 return;
233 }
234
235 clear_bit(leaving->hwdom, &br->busy_hwdoms);
236 }
237
238 static int nbp_switchdev_add(struct net_bridge_port *p,
239 struct netdev_phys_item_id ppid,
240 bool tx_fwd_offload,
241 struct netlink_ext_ack *extack)
242 {
243 int err;
244
245 if (p->offload_count) {
246 /* Prevent unsupported configurations such as a bridge port
247 * which is a bonding interface, and the member ports are from
248 * different hardware switches.
249 */
250 if (!netdev_phys_item_id_same(&p->ppid, &ppid)) {
251 NL_SET_ERR_MSG_MOD(extack,
252 "Same bridge port cannot be offloaded by two physical switches");
253 return -EBUSY;
254 }
255
256 /* Tolerate drivers that call switchdev_bridge_port_offload()
257 * more than once for the same bridge port, such as when the
258 * bridge port is an offloaded bonding/team interface.
259 */
260 p->offload_count++;
261
262 return 0;
263 }
264
265 p->ppid = ppid;
266 p->offload_count = 1;
267
268 err = nbp_switchdev_hwdom_set(p);
269 if (err)
270 return err;
271
272 if (tx_fwd_offload) {
273 p->flags |= BR_TX_FWD_OFFLOAD;
274 static_branch_inc(&br_switchdev_tx_fwd_offload);
275 }
276
277 return 0;
278 }
279
280 static void nbp_switchdev_del(struct net_bridge_port *p)
281 {
282 if (WARN_ON(!p->offload_count))
283 return;
284
285 p->offload_count--;
286
287 if (p->offload_count)
288 return;
289
290 if (p->hwdom)
291 nbp_switchdev_hwdom_put(p);
292
293 if (p->flags & BR_TX_FWD_OFFLOAD) {
294 p->flags &= ~BR_TX_FWD_OFFLOAD;
295 static_branch_dec(&br_switchdev_tx_fwd_offload);
296 }
297 }
298
299 static int
300 br_switchdev_fdb_replay_one(struct net_bridge *br, struct notifier_block *nb,
301 const struct net_bridge_fdb_entry *fdb,
302 unsigned long action, const void *ctx)
303 {
304 struct switchdev_notifier_fdb_info item;
305 int err;
306
307 br_switchdev_fdb_populate(br, &item, fdb, ctx);
308
309 err = nb->notifier_call(nb, action, &item);
310 return notifier_to_errno(err);
311 }
312
313 static int
314 br_switchdev_fdb_replay(const struct net_device *br_dev, const void *ctx,
315 bool adding, struct notifier_block *nb)
316 {
317 struct net_bridge_fdb_entry *fdb;
318 struct net_bridge *br;
319 unsigned long action;
320 int err = 0;
321
322 if (!nb)
323 return 0;
324
325 if (!netif_is_bridge_master(br_dev))
326 return -EINVAL;
327
328 br = netdev_priv(br_dev);
329
330 if (adding)
331 action = SWITCHDEV_FDB_ADD_TO_DEVICE;
332 else
333 action = SWITCHDEV_FDB_DEL_TO_DEVICE;
334
335 rcu_read_lock();
336
337 hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) {
338 err = br_switchdev_fdb_replay_one(br, nb, fdb, action, ctx);
339 if (err)
340 break;
341 }
342
343 rcu_read_unlock();
344
345 return err;
346 }
347
348 static int br_switchdev_vlan_attr_replay(struct net_device *br_dev,
349 const void *ctx,
350 struct notifier_block *nb,
351 struct netlink_ext_ack *extack)
352 {
353 struct switchdev_notifier_port_attr_info attr_info = {
354 .info = {
355 .dev = br_dev,
356 .extack = extack,
357 .ctx = ctx,
358 },
359 };
360 struct net_bridge *br = netdev_priv(br_dev);
361 struct net_bridge_vlan_group *vg;
362 struct switchdev_attr attr;
363 struct net_bridge_vlan *v;
364 int err;
365
366 attr_info.attr = &attr;
367 attr.orig_dev = br_dev;
368
369 vg = br_vlan_group(br);
370 if (!vg)
371 return 0;
372
373 list_for_each_entry(v, &vg->vlan_list, vlist) {
374 if (v->msti) {
375 attr.id = SWITCHDEV_ATTR_ID_VLAN_MSTI;
376 attr.u.vlan_msti.vid = v->vid;
377 attr.u.vlan_msti.msti = v->msti;
378
379 err = nb->notifier_call(nb, SWITCHDEV_PORT_ATTR_SET,
380 &attr_info);
381 err = notifier_to_errno(err);
382 if (err)
383 return err;
384 }
385 }
386
387 return 0;
388 }
389
390 static int
391 br_switchdev_vlan_replay_one(struct notifier_block *nb,
392 struct net_device *dev,
393 struct switchdev_obj_port_vlan *vlan,
394 const void *ctx, unsigned long action,
395 struct netlink_ext_ack *extack)
396 {
397 struct switchdev_notifier_port_obj_info obj_info = {
398 .info = {
399 .dev = dev,
400 .extack = extack,
401 .ctx = ctx,
402 },
403 .obj = &vlan->obj,
404 };
405 int err;
406
407 err = nb->notifier_call(nb, action, &obj_info);
408 return notifier_to_errno(err);
409 }
410
411 static int br_switchdev_vlan_replay_group(struct notifier_block *nb,
412 struct net_device *dev,
413 struct net_bridge_vlan_group *vg,
414 const void *ctx, unsigned long action,
415 struct netlink_ext_ack *extack)
416 {
417 struct net_bridge_vlan *v;
418 int err = 0;
419 u16 pvid;
420
421 if (!vg)
422 return 0;
423
424 pvid = br_get_pvid(vg);
425
426 list_for_each_entry(v, &vg->vlan_list, vlist) {
427 struct switchdev_obj_port_vlan vlan = {
428 .obj.orig_dev = dev,
429 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
430 .flags = br_vlan_flags(v, pvid),
431 .vid = v->vid,
432 };
433
434 if (!br_vlan_should_use(v))
435 continue;
436
437 err = br_switchdev_vlan_replay_one(nb, dev, &vlan, ctx,
438 action, extack);
439 if (err)
440 return err;
441 }
442
443 return 0;
444 }
445
446 static int br_switchdev_vlan_replay(struct net_device *br_dev,
447 const void *ctx, bool adding,
448 struct notifier_block *nb,
449 struct netlink_ext_ack *extack)
450 {
451 struct net_bridge *br = netdev_priv(br_dev);
452 struct net_bridge_port *p;
453 unsigned long action;
454 int err;
455
456 ASSERT_RTNL();
457
458 if (!nb)
459 return 0;
460
461 if (!netif_is_bridge_master(br_dev))
462 return -EINVAL;
463
464 if (adding)
465 action = SWITCHDEV_PORT_OBJ_ADD;
466 else
467 action = SWITCHDEV_PORT_OBJ_DEL;
468
469 err = br_switchdev_vlan_replay_group(nb, br_dev, br_vlan_group(br),
470 ctx, action, extack);
471 if (err)
472 return err;
473
474 list_for_each_entry(p, &br->port_list, list) {
475 struct net_device *dev = p->dev;
476
477 err = br_switchdev_vlan_replay_group(nb, dev,
478 nbp_vlan_group(p),
479 ctx, action, extack);
480 if (err)
481 return err;
482 }
483
484 if (adding) {
485 err = br_switchdev_vlan_attr_replay(br_dev, ctx, nb, extack);
486 if (err)
487 return err;
488 }
489
490 return 0;
491 }
492
493 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
494 struct br_switchdev_mdb_complete_info {
495 struct net_bridge_port *port;
496 struct br_ip ip;
497 };
498
499 static void br_switchdev_mdb_complete(struct net_device *dev, int err, void *priv)
500 {
501 struct br_switchdev_mdb_complete_info *data = priv;
502 struct net_bridge_port_group __rcu **pp;
503 struct net_bridge_port_group *p;
504 struct net_bridge_mdb_entry *mp;
505 struct net_bridge_port *port = data->port;
506 struct net_bridge *br = port->br;
507
508 if (err)
509 goto err;
510
511 spin_lock_bh(&br->multicast_lock);
512 mp = br_mdb_ip_get(br, &data->ip);
513 if (!mp)
514 goto out;
515 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
516 pp = &p->next) {
517 if (p->key.port != port)
518 continue;
519 p->flags |= MDB_PG_FLAGS_OFFLOAD;
520 }
521 out:
522 spin_unlock_bh(&br->multicast_lock);
523 err:
524 kfree(priv);
525 }
526
527 static void br_switchdev_mdb_populate(struct switchdev_obj_port_mdb *mdb,
528 const struct net_bridge_mdb_entry *mp)
529 {
530 if (mp->addr.proto == htons(ETH_P_IP))
531 ip_eth_mc_map(mp->addr.dst.ip4, mdb->addr);
532 #if IS_ENABLED(CONFIG_IPV6)
533 else if (mp->addr.proto == htons(ETH_P_IPV6))
534 ipv6_eth_mc_map(&mp->addr.dst.ip6, mdb->addr);
535 #endif
536 else
537 ether_addr_copy(mdb->addr, mp->addr.dst.mac_addr);
538
539 mdb->vid = mp->addr.vid;
540 }
541
542 static void br_switchdev_host_mdb_one(struct net_device *dev,
543 struct net_device *lower_dev,
544 struct net_bridge_mdb_entry *mp,
545 int type)
546 {
547 struct switchdev_obj_port_mdb mdb = {
548 .obj = {
549 .id = SWITCHDEV_OBJ_ID_HOST_MDB,
550 .flags = SWITCHDEV_F_DEFER,
551 .orig_dev = dev,
552 },
553 };
554
555 br_switchdev_mdb_populate(&mdb, mp);
556
557 switch (type) {
558 case RTM_NEWMDB:
559 switchdev_port_obj_add(lower_dev, &mdb.obj, NULL);
560 break;
561 case RTM_DELMDB:
562 switchdev_port_obj_del(lower_dev, &mdb.obj);
563 break;
564 }
565 }
566
567 static void br_switchdev_host_mdb(struct net_device *dev,
568 struct net_bridge_mdb_entry *mp, int type)
569 {
570 struct net_device *lower_dev;
571 struct list_head *iter;
572
573 netdev_for_each_lower_dev(dev, lower_dev, iter)
574 br_switchdev_host_mdb_one(dev, lower_dev, mp, type);
575 }
576
577 static int
578 br_switchdev_mdb_replay_one(struct notifier_block *nb, struct net_device *dev,
579 const struct switchdev_obj_port_mdb *mdb,
580 unsigned long action, const void *ctx,
581 struct netlink_ext_ack *extack)
582 {
583 struct switchdev_notifier_port_obj_info obj_info = {
584 .info = {
585 .dev = dev,
586 .extack = extack,
587 .ctx = ctx,
588 },
589 .obj = &mdb->obj,
590 };
591 int err;
592
593 err = nb->notifier_call(nb, action, &obj_info);
594 return notifier_to_errno(err);
595 }
596
597 static int br_switchdev_mdb_queue_one(struct list_head *mdb_list,
598 struct net_device *dev,
599 unsigned long action,
600 enum switchdev_obj_id id,
601 const struct net_bridge_mdb_entry *mp,
602 struct net_device *orig_dev)
603 {
604 struct switchdev_obj_port_mdb mdb = {
605 .obj = {
606 .id = id,
607 .orig_dev = orig_dev,
608 },
609 };
610 struct switchdev_obj_port_mdb *pmdb;
611
612 br_switchdev_mdb_populate(&mdb, mp);
613
614 if (action == SWITCHDEV_PORT_OBJ_ADD &&
615 switchdev_port_obj_act_is_deferred(dev, action, &mdb.obj)) {
616 /* This event is already in the deferred queue of
617 * events, so this replay must be elided, lest the
618 * driver receives duplicate events for it. This can
619 * only happen when replaying additions, since
620 * modifications are always immediately visible in
621 * br->mdb_list, whereas actual event delivery may be
622 * delayed.
623 */
624 return 0;
625 }
626
627 pmdb = kmemdup(&mdb, sizeof(mdb), GFP_ATOMIC);
628 if (!pmdb)
629 return -ENOMEM;
630
631 list_add_tail(&pmdb->obj.list, mdb_list);
632 return 0;
633 }
634
635 void br_switchdev_mdb_notify(struct net_device *dev,
636 struct net_bridge_mdb_entry *mp,
637 struct net_bridge_port_group *pg,
638 int type)
639 {
640 struct br_switchdev_mdb_complete_info *complete_info;
641 struct switchdev_obj_port_mdb mdb = {
642 .obj = {
643 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
644 .flags = SWITCHDEV_F_DEFER,
645 },
646 };
647
648 if (!pg)
649 return br_switchdev_host_mdb(dev, mp, type);
650
651 br_switchdev_mdb_populate(&mdb, mp);
652
653 mdb.obj.orig_dev = pg->key.port->dev;
654 switch (type) {
655 case RTM_NEWMDB:
656 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
657 if (!complete_info)
658 break;
659 complete_info->port = pg->key.port;
660 complete_info->ip = mp->addr;
661 mdb.obj.complete_priv = complete_info;
662 mdb.obj.complete = br_switchdev_mdb_complete;
663 if (switchdev_port_obj_add(pg->key.port->dev, &mdb.obj, NULL))
664 kfree(complete_info);
665 break;
666 case RTM_DELMDB:
667 switchdev_port_obj_del(pg->key.port->dev, &mdb.obj);
668 break;
669 }
670 }
671 #endif
672
673 static int
674 br_switchdev_mdb_replay(struct net_device *br_dev, struct net_device *dev,
675 const void *ctx, bool adding, struct notifier_block *nb,
676 struct netlink_ext_ack *extack)
677 {
678 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
679 const struct net_bridge_mdb_entry *mp;
680 struct switchdev_obj *obj, *tmp;
681 struct net_bridge *br;
682 unsigned long action;
683 LIST_HEAD(mdb_list);
684 int err = 0;
685
686 ASSERT_RTNL();
687
688 if (!nb)
689 return 0;
690
691 if (!netif_is_bridge_master(br_dev) || !netif_is_bridge_port(dev))
692 return -EINVAL;
693
694 br = netdev_priv(br_dev);
695
696 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
697 return 0;
698
699 if (adding)
700 action = SWITCHDEV_PORT_OBJ_ADD;
701 else
702 action = SWITCHDEV_PORT_OBJ_DEL;
703
704 /* br_switchdev_mdb_queue_one() will take care to not queue a
705 * replay of an event that is already pending in the switchdev
706 * deferred queue. In order to safely determine that, there
707 * must be no new deferred MDB notifications enqueued for the
708 * duration of the MDB scan. Therefore, grab the write-side
709 * lock to avoid racing with any concurrent IGMP/MLD snooping.
710 */
711 spin_lock_bh(&br->multicast_lock);
712
713 hlist_for_each_entry(mp, &br->mdb_list, mdb_node) {
714 struct net_bridge_port_group __rcu * const *pp;
715 const struct net_bridge_port_group *p;
716
717 if (mp->host_joined) {
718 err = br_switchdev_mdb_queue_one(&mdb_list, dev, action,
719 SWITCHDEV_OBJ_ID_HOST_MDB,
720 mp, br_dev);
721 if (err) {
722 spin_unlock_bh(&br->multicast_lock);
723 goto out_free_mdb;
724 }
725 }
726
727 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
728 pp = &p->next) {
729 if (p->key.port->dev != dev)
730 continue;
731
732 err = br_switchdev_mdb_queue_one(&mdb_list, dev, action,
733 SWITCHDEV_OBJ_ID_PORT_MDB,
734 mp, dev);
735 if (err) {
736 spin_unlock_bh(&br->multicast_lock);
737 goto out_free_mdb;
738 }
739 }
740 }
741
742 spin_unlock_bh(&br->multicast_lock);
743
744 list_for_each_entry(obj, &mdb_list, list) {
745 err = br_switchdev_mdb_replay_one(nb, dev,
746 SWITCHDEV_OBJ_PORT_MDB(obj),
747 action, ctx, extack);
748 if (err == -EOPNOTSUPP)
749 err = 0;
750 if (err)
751 goto out_free_mdb;
752 }
753
754 out_free_mdb:
755 list_for_each_entry_safe(obj, tmp, &mdb_list, list) {
756 list_del(&obj->list);
757 kfree(SWITCHDEV_OBJ_PORT_MDB(obj));
758 }
759
760 if (err)
761 return err;
762 #endif
763
764 return 0;
765 }
766
767 static int nbp_switchdev_sync_objs(struct net_bridge_port *p, const void *ctx,
768 struct notifier_block *atomic_nb,
769 struct notifier_block *blocking_nb,
770 struct netlink_ext_ack *extack)
771 {
772 struct net_device *br_dev = p->br->dev;
773 struct net_device *dev = p->dev;
774 int err;
775
776 err = br_switchdev_vlan_replay(br_dev, ctx, true, blocking_nb, extack);
777 if (err && err != -EOPNOTSUPP)
778 return err;
779
780 err = br_switchdev_mdb_replay(br_dev, dev, ctx, true, blocking_nb,
781 extack);
782 if (err) {
783 /* -EOPNOTSUPP not propagated from MDB replay. */
784 return err;
785 }
786
787 err = br_switchdev_fdb_replay(br_dev, ctx, true, atomic_nb);
788 if (err && err != -EOPNOTSUPP)
789 return err;
790
791 return 0;
792 }
793
794 static void nbp_switchdev_unsync_objs(struct net_bridge_port *p,
795 const void *ctx,
796 struct notifier_block *atomic_nb,
797 struct notifier_block *blocking_nb)
798 {
799 struct net_device *br_dev = p->br->dev;
800 struct net_device *dev = p->dev;
801
802 br_switchdev_fdb_replay(br_dev, ctx, false, atomic_nb);
803
804 br_switchdev_mdb_replay(br_dev, dev, ctx, false, blocking_nb, NULL);
805
806 br_switchdev_vlan_replay(br_dev, ctx, false, blocking_nb, NULL);
807
808 /* Make sure that the device leaving this bridge has seen all
809 * relevant events before it is disassociated. In the normal
810 * case, when the device is directly attached to the bridge,
811 * this is covered by del_nbp(). If the association was indirect
812 * however, e.g. via a team or bond, and the device is leaving
813 * that intermediate device, then the bridge port remains in
814 * place.
815 */
816 switchdev_deferred_process();
817 }
818
819 /* Let the bridge know that this port is offloaded, so that it can assign a
820 * switchdev hardware domain to it.
821 */
822 int br_switchdev_port_offload(struct net_bridge_port *p,
823 struct net_device *dev, const void *ctx,
824 struct notifier_block *atomic_nb,
825 struct notifier_block *blocking_nb,
826 bool tx_fwd_offload,
827 struct netlink_ext_ack *extack)
828 {
829 struct netdev_phys_item_id ppid;
830 int err;
831
832 err = dev_get_port_parent_id(dev, &ppid, false);
833 if (err)
834 return err;
835
836 err = nbp_switchdev_add(p, ppid, tx_fwd_offload, extack);
837 if (err)
838 return err;
839
840 err = nbp_switchdev_sync_objs(p, ctx, atomic_nb, blocking_nb, extack);
841 if (err)
842 goto out_switchdev_del;
843
844 return 0;
845
846 out_switchdev_del:
847 nbp_switchdev_del(p);
848
849 return err;
850 }
851
852 void br_switchdev_port_unoffload(struct net_bridge_port *p, const void *ctx,
853 struct notifier_block *atomic_nb,
854 struct notifier_block *blocking_nb)
855 {
856 nbp_switchdev_unsync_objs(p, ctx, atomic_nb, blocking_nb);
857
858 nbp_switchdev_del(p);
859 }
860
861 int br_switchdev_port_replay(struct net_bridge_port *p,
862 struct net_device *dev, const void *ctx,
863 struct notifier_block *atomic_nb,
864 struct notifier_block *blocking_nb,
865 struct netlink_ext_ack *extack)
866 {
867 return nbp_switchdev_sync_objs(p, ctx, atomic_nb, blocking_nb, extack);
868 }
869
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