1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 #include <linux/mrp_bridge.h>
4 #include "br_private_mrp.h"
5
6 static const u8 mrp_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x1 };
7 static const u8 mrp_in_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x3 };
8
9 static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
10
11 static struct br_frame_type mrp_frame_type __read_mostly = {
12 .type = cpu_to_be16(ETH_P_MRP),
13 .frame_handler = br_mrp_process,
14 };
15
16 static bool br_mrp_is_ring_port(struct net_bridge_port *p_port,
17 struct net_bridge_port *s_port,
18 struct net_bridge_port *port)
19 {
20 if (port == p_port ||
21 port == s_port)
22 return true;
23
24 return false;
25 }
26
27 static bool br_mrp_is_in_port(struct net_bridge_port *i_port,
28 struct net_bridge_port *port)
29 {
30 if (port == i_port)
31 return true;
32
33 return false;
34 }
35
36 static struct net_bridge_port *br_mrp_get_port(struct net_bridge *br,
37 u32 ifindex)
38 {
39 struct net_bridge_port *res = NULL;
40 struct net_bridge_port *port;
41
42 list_for_each_entry(port, &br->port_list, list) {
43 if (port->dev->ifindex == ifindex) {
44 res = port;
45 break;
46 }
47 }
48
49 return res;
50 }
51
52 static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id)
53 {
54 struct br_mrp *res = NULL;
55 struct br_mrp *mrp;
56
57 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
58 lockdep_rtnl_is_held()) {
59 if (mrp->ring_id == ring_id) {
60 res = mrp;
61 break;
62 }
63 }
64
65 return res;
66 }
67
68 static struct br_mrp *br_mrp_find_in_id(struct net_bridge *br, u32 in_id)
69 {
70 struct br_mrp *res = NULL;
71 struct br_mrp *mrp;
72
73 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
74 lockdep_rtnl_is_held()) {
75 if (mrp->in_id == in_id) {
76 res = mrp;
77 break;
78 }
79 }
80
81 return res;
82 }
83
84 static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
85 {
86 struct br_mrp *mrp;
87
88 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
89 lockdep_rtnl_is_held()) {
90 struct net_bridge_port *p;
91
92 p = rtnl_dereference(mrp->p_port);
93 if (p && p->dev->ifindex == ifindex)
94 return false;
95
96 p = rtnl_dereference(mrp->s_port);
97 if (p && p->dev->ifindex == ifindex)
98 return false;
99
100 p = rtnl_dereference(mrp->i_port);
101 if (p && p->dev->ifindex == ifindex)
102 return false;
103 }
104
105 return true;
106 }
107
108 static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
109 struct net_bridge_port *p)
110 {
111 struct br_mrp *res = NULL;
112 struct br_mrp *mrp;
113
114 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
115 lockdep_rtnl_is_held()) {
116 if (rcu_access_pointer(mrp->p_port) == p ||
117 rcu_access_pointer(mrp->s_port) == p ||
118 rcu_access_pointer(mrp->i_port) == p) {
119 res = mrp;
120 break;
121 }
122 }
123
124 return res;
125 }
126
127 static int br_mrp_next_seq(struct br_mrp *mrp)
128 {
129 mrp->seq_id++;
130 return mrp->seq_id;
131 }
132
133 static struct sk_buff *br_mrp_skb_alloc(struct net_bridge_port *p,
134 const u8 *src, const u8 *dst)
135 {
136 struct ethhdr *eth_hdr;
137 struct sk_buff *skb;
138 __be16 *version;
139
140 skb = dev_alloc_skb(MRP_MAX_FRAME_LENGTH);
141 if (!skb)
142 return NULL;
143
144 skb->dev = p->dev;
145 skb->protocol = htons(ETH_P_MRP);
146 skb->priority = MRP_FRAME_PRIO;
147 skb_reserve(skb, sizeof(*eth_hdr));
148
149 eth_hdr = skb_push(skb, sizeof(*eth_hdr));
150 ether_addr_copy(eth_hdr->h_dest, dst);
151 ether_addr_copy(eth_hdr->h_source, src);
152 eth_hdr->h_proto = htons(ETH_P_MRP);
153
154 version = skb_put(skb, sizeof(*version));
155 *version = cpu_to_be16(MRP_VERSION);
156
157 return skb;
158 }
159
160 static void br_mrp_skb_tlv(struct sk_buff *skb,
161 enum br_mrp_tlv_header_type type,
162 u8 length)
163 {
164 struct br_mrp_tlv_hdr *hdr;
165
166 hdr = skb_put(skb, sizeof(*hdr));
167 hdr->type = type;
168 hdr->length = length;
169 }
170
171 static void br_mrp_skb_common(struct sk_buff *skb, struct br_mrp *mrp)
172 {
173 struct br_mrp_common_hdr *hdr;
174
175 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_COMMON, sizeof(*hdr));
176
177 hdr = skb_put(skb, sizeof(*hdr));
178 hdr->seq_id = cpu_to_be16(br_mrp_next_seq(mrp));
179 memset(hdr->domain, 0xff, MRP_DOMAIN_UUID_LENGTH);
180 }
181
182 static struct sk_buff *br_mrp_alloc_test_skb(struct br_mrp *mrp,
183 struct net_bridge_port *p,
184 enum br_mrp_port_role_type port_role)
185 {
186 struct br_mrp_ring_test_hdr *hdr = NULL;
187 struct sk_buff *skb = NULL;
188
189 if (!p)
190 return NULL;
191
192 skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_test_dmac);
193 if (!skb)
194 return NULL;
195
196 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_RING_TEST, sizeof(*hdr));
197 hdr = skb_put(skb, sizeof(*hdr));
198
199 hdr->prio = cpu_to_be16(mrp->prio);
200 ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
201 hdr->port_role = cpu_to_be16(port_role);
202 hdr->state = cpu_to_be16(mrp->ring_state);
203 hdr->transitions = cpu_to_be16(mrp->ring_transitions);
204 hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies));
205
206 br_mrp_skb_common(skb, mrp);
207
208 /* In case the node behaves as MRA then the Test frame needs to have
209 * an Option TLV which includes eventually a sub-option TLV that has
210 * the type AUTO_MGR
211 */
212 if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) {
213 struct br_mrp_sub_option1_hdr *sub_opt = NULL;
214 struct br_mrp_tlv_hdr *sub_tlv = NULL;
215 struct br_mrp_oui_hdr *oui = NULL;
216 u8 length;
217
218 length = sizeof(*sub_opt) + sizeof(*sub_tlv) + sizeof(oui) +
219 MRP_OPT_PADDING;
220 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_OPTION, length);
221
222 oui = skb_put(skb, sizeof(*oui));
223 memset(oui, 0x0, sizeof(*oui));
224 sub_opt = skb_put(skb, sizeof(*sub_opt));
225 memset(sub_opt, 0x0, sizeof(*sub_opt));
226
227 sub_tlv = skb_put(skb, sizeof(*sub_tlv));
228 sub_tlv->type = BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR;
229
230 /* 32 bit alligment shall be ensured therefore add 2 bytes */
231 skb_put(skb, MRP_OPT_PADDING);
232 }
233
234 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
235
236 return skb;
237 }
238
239 static struct sk_buff *br_mrp_alloc_in_test_skb(struct br_mrp *mrp,
240 struct net_bridge_port *p,
241 enum br_mrp_port_role_type port_role)
242 {
243 struct br_mrp_in_test_hdr *hdr = NULL;
244 struct sk_buff *skb = NULL;
245
246 if (!p)
247 return NULL;
248
249 skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_in_test_dmac);
250 if (!skb)
251 return NULL;
252
253 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_IN_TEST, sizeof(*hdr));
254 hdr = skb_put(skb, sizeof(*hdr));
255
256 hdr->id = cpu_to_be16(mrp->in_id);
257 ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
258 hdr->port_role = cpu_to_be16(port_role);
259 hdr->state = cpu_to_be16(mrp->in_state);
260 hdr->transitions = cpu_to_be16(mrp->in_transitions);
261 hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies));
262
263 br_mrp_skb_common(skb, mrp);
264 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
265
266 return skb;
267 }
268
269 /* This function is continuously called in the following cases:
270 * - when node role is MRM, in this case test_monitor is always set to false
271 * because it needs to notify the userspace that the ring is open and needs to
272 * send MRP_Test frames
273 * - when node role is MRA, there are 2 subcases:
274 * - when MRA behaves as MRM, in this case is similar with MRM role
275 * - when MRA behaves as MRC, in this case test_monitor is set to true,
276 * because it needs to detect when it stops seeing MRP_Test frames
277 * from MRM node but it doesn't need to send MRP_Test frames.
278 */
279 static void br_mrp_test_work_expired(struct work_struct *work)
280 {
281 struct delayed_work *del_work = to_delayed_work(work);
282 struct br_mrp *mrp = container_of(del_work, struct br_mrp, test_work);
283 struct net_bridge_port *p;
284 bool notify_open = false;
285 struct sk_buff *skb;
286
287 if (time_before_eq(mrp->test_end, jiffies))
288 return;
289
290 if (mrp->test_count_miss < mrp->test_max_miss) {
291 mrp->test_count_miss++;
292 } else {
293 /* Notify that the ring is open only if the ring state is
294 * closed, otherwise it would continue to notify at every
295 * interval.
296 * Also notify that the ring is open when the node has the
297 * role MRA and behaves as MRC. The reason is that the
298 * userspace needs to know when the MRM stopped sending
299 * MRP_Test frames so that the current node to try to take
300 * the role of a MRM.
301 */
302 if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED ||
303 mrp->test_monitor)
304 notify_open = true;
305 }
306
307 rcu_read_lock();
308
309 p = rcu_dereference(mrp->p_port);
310 if (p) {
311 if (!mrp->test_monitor) {
312 skb = br_mrp_alloc_test_skb(mrp, p,
313 BR_MRP_PORT_ROLE_PRIMARY);
314 if (!skb)
315 goto out;
316
317 skb_reset_network_header(skb);
318 dev_queue_xmit(skb);
319 }
320
321 if (notify_open && !mrp->ring_role_offloaded)
322 br_mrp_ring_port_open(p->dev, true);
323 }
324
325 p = rcu_dereference(mrp->s_port);
326 if (p) {
327 if (!mrp->test_monitor) {
328 skb = br_mrp_alloc_test_skb(mrp, p,
329 BR_MRP_PORT_ROLE_SECONDARY);
330 if (!skb)
331 goto out;
332
333 skb_reset_network_header(skb);
334 dev_queue_xmit(skb);
335 }
336
337 if (notify_open && !mrp->ring_role_offloaded)
338 br_mrp_ring_port_open(p->dev, true);
339 }
340
341 out:
342 rcu_read_unlock();
343
344 queue_delayed_work(system_wq, &mrp->test_work,
345 usecs_to_jiffies(mrp->test_interval));
346 }
347
348 /* This function is continuously called when the node has the interconnect role
349 * MIM. It would generate interconnect test frames and will send them on all 3
350 * ports. But will also check if it stop receiving interconnect test frames.
351 */
352 static void br_mrp_in_test_work_expired(struct work_struct *work)
353 {
354 struct delayed_work *del_work = to_delayed_work(work);
355 struct br_mrp *mrp = container_of(del_work, struct br_mrp, in_test_work);
356 struct net_bridge_port *p;
357 bool notify_open = false;
358 struct sk_buff *skb;
359
360 if (time_before_eq(mrp->in_test_end, jiffies))
361 return;
362
363 if (mrp->in_test_count_miss < mrp->in_test_max_miss) {
364 mrp->in_test_count_miss++;
365 } else {
366 /* Notify that the interconnect ring is open only if the
367 * interconnect ring state is closed, otherwise it would
368 * continue to notify at every interval.
369 */
370 if (mrp->in_state == BR_MRP_IN_STATE_CLOSED)
371 notify_open = true;
372 }
373
374 rcu_read_lock();
375
376 p = rcu_dereference(mrp->p_port);
377 if (p) {
378 skb = br_mrp_alloc_in_test_skb(mrp, p,
379 BR_MRP_PORT_ROLE_PRIMARY);
380 if (!skb)
381 goto out;
382
383 skb_reset_network_header(skb);
384 dev_queue_xmit(skb);
385
386 if (notify_open && !mrp->in_role_offloaded)
387 br_mrp_in_port_open(p->dev, true);
388 }
389
390 p = rcu_dereference(mrp->s_port);
391 if (p) {
392 skb = br_mrp_alloc_in_test_skb(mrp, p,
393 BR_MRP_PORT_ROLE_SECONDARY);
394 if (!skb)
395 goto out;
396
397 skb_reset_network_header(skb);
398 dev_queue_xmit(skb);
399
400 if (notify_open && !mrp->in_role_offloaded)
401 br_mrp_in_port_open(p->dev, true);
402 }
403
404 p = rcu_dereference(mrp->i_port);
405 if (p) {
406 skb = br_mrp_alloc_in_test_skb(mrp, p,
407 BR_MRP_PORT_ROLE_INTER);
408 if (!skb)
409 goto out;
410
411 skb_reset_network_header(skb);
412 dev_queue_xmit(skb);
413
414 if (notify_open && !mrp->in_role_offloaded)
415 br_mrp_in_port_open(p->dev, true);
416 }
417
418 out:
419 rcu_read_unlock();
420
421 queue_delayed_work(system_wq, &mrp->in_test_work,
422 usecs_to_jiffies(mrp->in_test_interval));
423 }
424
425 /* Deletes the MRP instance.
426 * note: called under rtnl_lock
427 */
428 static void br_mrp_del_impl(struct net_bridge *br, struct br_mrp *mrp)
429 {
430 struct net_bridge_port *p;
431 u8 state;
432
433 /* Stop sending MRP_Test frames */
434 cancel_delayed_work_sync(&mrp->test_work);
435 br_mrp_switchdev_send_ring_test(br, mrp, 0, 0, 0, 0);
436
437 /* Stop sending MRP_InTest frames if has an interconnect role */
438 cancel_delayed_work_sync(&mrp->in_test_work);
439 br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
440
441 /* Disable the roles */
442 br_mrp_switchdev_set_ring_role(br, mrp, BR_MRP_RING_ROLE_DISABLED);
443 p = rtnl_dereference(mrp->i_port);
444 if (p)
445 br_mrp_switchdev_set_in_role(br, mrp, mrp->in_id, mrp->ring_id,
446 BR_MRP_IN_ROLE_DISABLED);
447
448 br_mrp_switchdev_del(br, mrp);
449
450 /* Reset the ports */
451 p = rtnl_dereference(mrp->p_port);
452 if (p) {
453 spin_lock_bh(&br->lock);
454 state = netif_running(br->dev) ?
455 BR_STATE_FORWARDING : BR_STATE_DISABLED;
456 p->state = state;
457 p->flags &= ~BR_MRP_AWARE;
458 spin_unlock_bh(&br->lock);
459 br_mrp_port_switchdev_set_state(p, state);
460 rcu_assign_pointer(mrp->p_port, NULL);
461 }
462
463 p = rtnl_dereference(mrp->s_port);
464 if (p) {
465 spin_lock_bh(&br->lock);
466 state = netif_running(br->dev) ?
467 BR_STATE_FORWARDING : BR_STATE_DISABLED;
468 p->state = state;
469 p->flags &= ~BR_MRP_AWARE;
470 spin_unlock_bh(&br->lock);
471 br_mrp_port_switchdev_set_state(p, state);
472 rcu_assign_pointer(mrp->s_port, NULL);
473 }
474
475 p = rtnl_dereference(mrp->i_port);
476 if (p) {
477 spin_lock_bh(&br->lock);
478 state = netif_running(br->dev) ?
479 BR_STATE_FORWARDING : BR_STATE_DISABLED;
480 p->state = state;
481 p->flags &= ~BR_MRP_AWARE;
482 spin_unlock_bh(&br->lock);
483 br_mrp_port_switchdev_set_state(p, state);
484 rcu_assign_pointer(mrp->i_port, NULL);
485 }
486
487 hlist_del_rcu(&mrp->list);
488 kfree_rcu(mrp, rcu);
489
490 if (hlist_empty(&br->mrp_list))
491 br_del_frame(br, &mrp_frame_type);
492 }
493
494 /* Adds a new MRP instance.
495 * note: called under rtnl_lock
496 */
497 int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
498 {
499 struct net_bridge_port *p;
500 struct br_mrp *mrp;
501 int err;
502
503 /* If the ring exists, it is not possible to create another one with the
504 * same ring_id
505 */
506 mrp = br_mrp_find_id(br, instance->ring_id);
507 if (mrp)
508 return -EINVAL;
509
510 if (!br_mrp_get_port(br, instance->p_ifindex) ||
511 !br_mrp_get_port(br, instance->s_ifindex))
512 return -EINVAL;
513
514 /* It is not possible to have the same port part of multiple rings */
515 if (!br_mrp_unique_ifindex(br, instance->p_ifindex) ||
516 !br_mrp_unique_ifindex(br, instance->s_ifindex))
517 return -EINVAL;
518
519 mrp = kzalloc(sizeof(*mrp), GFP_KERNEL);
520 if (!mrp)
521 return -ENOMEM;
522
523 mrp->ring_id = instance->ring_id;
524 mrp->prio = instance->prio;
525
526 p = br_mrp_get_port(br, instance->p_ifindex);
527 spin_lock_bh(&br->lock);
528 p->state = BR_STATE_FORWARDING;
529 p->flags |= BR_MRP_AWARE;
530 spin_unlock_bh(&br->lock);
531 rcu_assign_pointer(mrp->p_port, p);
532
533 p = br_mrp_get_port(br, instance->s_ifindex);
534 spin_lock_bh(&br->lock);
535 p->state = BR_STATE_FORWARDING;
536 p->flags |= BR_MRP_AWARE;
537 spin_unlock_bh(&br->lock);
538 rcu_assign_pointer(mrp->s_port, p);
539
540 if (hlist_empty(&br->mrp_list))
541 br_add_frame(br, &mrp_frame_type);
542
543 INIT_DELAYED_WORK(&mrp->test_work, br_mrp_test_work_expired);
544 INIT_DELAYED_WORK(&mrp->in_test_work, br_mrp_in_test_work_expired);
545 hlist_add_tail_rcu(&mrp->list, &br->mrp_list);
546
547 err = br_mrp_switchdev_add(br, mrp);
548 if (err)
549 goto delete_mrp;
550
551 return 0;
552
553 delete_mrp:
554 br_mrp_del_impl(br, mrp);
555
556 return err;
557 }
558
559 /* Deletes the MRP instance from which the port is part of
560 * note: called under rtnl_lock
561 */
562 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p)
563 {
564 struct br_mrp *mrp = br_mrp_find_port(br, p);
565
566 /* If the port is not part of a MRP instance just bail out */
567 if (!mrp)
568 return;
569
570 br_mrp_del_impl(br, mrp);
571 }
572
573 /* Deletes existing MRP instance based on ring_id
574 * note: called under rtnl_lock
575 */
576 int br_mrp_del(struct net_bridge *br, struct br_mrp_instance *instance)
577 {
578 struct br_mrp *mrp = br_mrp_find_id(br, instance->ring_id);
579
580 if (!mrp)
581 return -EINVAL;
582
583 br_mrp_del_impl(br, mrp);
584
585 return 0;
586 }
587
588 /* Set port state, port state can be forwarding, blocked or disabled
589 * note: already called with rtnl_lock
590 */
591 int br_mrp_set_port_state(struct net_bridge_port *p,
592 enum br_mrp_port_state_type state)
593 {
594 u32 port_state;
595
596 if (!p || !(p->flags & BR_MRP_AWARE))
597 return -EINVAL;
598
599 spin_lock_bh(&p->br->lock);
600
601 if (state == BR_MRP_PORT_STATE_FORWARDING)
602 port_state = BR_STATE_FORWARDING;
603 else
604 port_state = BR_STATE_BLOCKING;
605
606 p->state = port_state;
607 spin_unlock_bh(&p->br->lock);
608
609 br_mrp_port_switchdev_set_state(p, port_state);
610
611 return 0;
612 }
613
614 /* Set port role, port role can be primary or secondary
615 * note: already called with rtnl_lock
616 */
617 int br_mrp_set_port_role(struct net_bridge_port *p,
618 enum br_mrp_port_role_type role)
619 {
620 struct br_mrp *mrp;
621
622 if (!p || !(p->flags & BR_MRP_AWARE))
623 return -EINVAL;
624
625 mrp = br_mrp_find_port(p->br, p);
626
627 if (!mrp)
628 return -EINVAL;
629
630 switch (role) {
631 case BR_MRP_PORT_ROLE_PRIMARY:
632 rcu_assign_pointer(mrp->p_port, p);
633 break;
634 case BR_MRP_PORT_ROLE_SECONDARY:
635 rcu_assign_pointer(mrp->s_port, p);
636 break;
637 default:
638 return -EINVAL;
639 }
640
641 br_mrp_port_switchdev_set_role(p, role);
642
643 return 0;
644 }
645
646 /* Set ring state, ring state can be only Open or Closed
647 * note: already called with rtnl_lock
648 */
649 int br_mrp_set_ring_state(struct net_bridge *br,
650 struct br_mrp_ring_state *state)
651 {
652 struct br_mrp *mrp = br_mrp_find_id(br, state->ring_id);
653
654 if (!mrp)
655 return -EINVAL;
656
657 if (mrp->ring_state != state->ring_state)
658 mrp->ring_transitions++;
659
660 mrp->ring_state = state->ring_state;
661
662 br_mrp_switchdev_set_ring_state(br, mrp, state->ring_state);
663
664 return 0;
665 }
666
667 /* Set ring role, ring role can be only MRM(Media Redundancy Manager) or
668 * MRC(Media Redundancy Client).
669 * note: already called with rtnl_lock
670 */
671 int br_mrp_set_ring_role(struct net_bridge *br,
672 struct br_mrp_ring_role *role)
673 {
674 struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
675 enum br_mrp_hw_support support;
676
677 if (!mrp)
678 return -EINVAL;
679
680 mrp->ring_role = role->ring_role;
681
682 /* If there is an error just bailed out */
683 support = br_mrp_switchdev_set_ring_role(br, mrp, role->ring_role);
684 if (support == BR_MRP_NONE)
685 return -EOPNOTSUPP;
686
687 /* Now detect if the HW actually applied the role or not. If the HW
688 * applied the role it means that the SW will not to do those operations
689 * anymore. For example if the role ir MRM then the HW will notify the
690 * SW when ring is open, but if the is not pushed to the HW the SW will
691 * need to detect when the ring is open
692 */
693 mrp->ring_role_offloaded = support == BR_MRP_SW ? 0 : 1;
694
695 return 0;
696 }
697
698 /* Start to generate or monitor MRP test frames, the frames are generated by
699 * HW and if it fails, they are generated by the SW.
700 * note: already called with rtnl_lock
701 */
702 int br_mrp_start_test(struct net_bridge *br,
703 struct br_mrp_start_test *test)
704 {
705 struct br_mrp *mrp = br_mrp_find_id(br, test->ring_id);
706 enum br_mrp_hw_support support;
707
708 if (!mrp)
709 return -EINVAL;
710
711 /* Try to push it to the HW and if it fails then continue with SW
712 * implementation and if that also fails then return error.
713 */
714 support = br_mrp_switchdev_send_ring_test(br, mrp, test->interval,
715 test->max_miss, test->period,
716 test->monitor);
717 if (support == BR_MRP_NONE)
718 return -EOPNOTSUPP;
719
720 if (support == BR_MRP_HW)
721 return 0;
722
723 mrp->test_interval = test->interval;
724 mrp->test_end = jiffies + usecs_to_jiffies(test->period);
725 mrp->test_max_miss = test->max_miss;
726 mrp->test_monitor = test->monitor;
727 mrp->test_count_miss = 0;
728 queue_delayed_work(system_wq, &mrp->test_work,
729 usecs_to_jiffies(test->interval));
730
731 return 0;
732 }
733
734 /* Set in state, int state can be only Open or Closed
735 * note: already called with rtnl_lock
736 */
737 int br_mrp_set_in_state(struct net_bridge *br, struct br_mrp_in_state *state)
738 {
739 struct br_mrp *mrp = br_mrp_find_in_id(br, state->in_id);
740
741 if (!mrp)
742 return -EINVAL;
743
744 if (mrp->in_state != state->in_state)
745 mrp->in_transitions++;
746
747 mrp->in_state = state->in_state;
748
749 br_mrp_switchdev_set_in_state(br, mrp, state->in_state);
750
751 return 0;
752 }
753
754 /* Set in role, in role can be only MIM(Media Interconnection Manager) or
755 * MIC(Media Interconnection Client).
756 * note: already called with rtnl_lock
757 */
758 int br_mrp_set_in_role(struct net_bridge *br, struct br_mrp_in_role *role)
759 {
760 struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
761 enum br_mrp_hw_support support;
762 struct net_bridge_port *p;
763
764 if (!mrp)
765 return -EINVAL;
766
767 if (!br_mrp_get_port(br, role->i_ifindex))
768 return -EINVAL;
769
770 if (role->in_role == BR_MRP_IN_ROLE_DISABLED) {
771 u8 state;
772
773 /* It is not allowed to disable a port that doesn't exist */
774 p = rtnl_dereference(mrp->i_port);
775 if (!p)
776 return -EINVAL;
777
778 /* Stop the generating MRP_InTest frames */
779 cancel_delayed_work_sync(&mrp->in_test_work);
780 br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
781
782 /* Remove the port */
783 spin_lock_bh(&br->lock);
784 state = netif_running(br->dev) ?
785 BR_STATE_FORWARDING : BR_STATE_DISABLED;
786 p->state = state;
787 p->flags &= ~BR_MRP_AWARE;
788 spin_unlock_bh(&br->lock);
789 br_mrp_port_switchdev_set_state(p, state);
790 rcu_assign_pointer(mrp->i_port, NULL);
791
792 mrp->in_role = role->in_role;
793 mrp->in_id = 0;
794
795 return 0;
796 }
797
798 /* It is not possible to have the same port part of multiple rings */
799 if (!br_mrp_unique_ifindex(br, role->i_ifindex))
800 return -EINVAL;
801
802 /* It is not allowed to set a different interconnect port if the mrp
803 * instance has already one. First it needs to be disabled and after
804 * that set the new port
805 */
806 if (rcu_access_pointer(mrp->i_port))
807 return -EINVAL;
808
809 p = br_mrp_get_port(br, role->i_ifindex);
810 spin_lock_bh(&br->lock);
811 p->state = BR_STATE_FORWARDING;
812 p->flags |= BR_MRP_AWARE;
813 spin_unlock_bh(&br->lock);
814 rcu_assign_pointer(mrp->i_port, p);
815
816 mrp->in_role = role->in_role;
817 mrp->in_id = role->in_id;
818
819 /* If there is an error just bailed out */
820 support = br_mrp_switchdev_set_in_role(br, mrp, role->in_id,
821 role->ring_id, role->in_role);
822 if (support == BR_MRP_NONE)
823 return -EOPNOTSUPP;
824
825 /* Now detect if the HW actually applied the role or not. If the HW
826 * applied the role it means that the SW will not to do those operations
827 * anymore. For example if the role is MIM then the HW will notify the
828 * SW when interconnect ring is open, but if the is not pushed to the HW
829 * the SW will need to detect when the interconnect ring is open.
830 */
831 mrp->in_role_offloaded = support == BR_MRP_SW ? 0 : 1;
832
833 return 0;
834 }
835
836 /* Start to generate MRP_InTest frames, the frames are generated by
837 * HW and if it fails, they are generated by the SW.
838 * note: already called with rtnl_lock
839 */
840 int br_mrp_start_in_test(struct net_bridge *br,
841 struct br_mrp_start_in_test *in_test)
842 {
843 struct br_mrp *mrp = br_mrp_find_in_id(br, in_test->in_id);
844 enum br_mrp_hw_support support;
845
846 if (!mrp)
847 return -EINVAL;
848
849 if (mrp->in_role != BR_MRP_IN_ROLE_MIM)
850 return -EINVAL;
851
852 /* Try to push it to the HW and if it fails then continue with SW
853 * implementation and if that also fails then return error.
854 */
855 support = br_mrp_switchdev_send_in_test(br, mrp, in_test->interval,
856 in_test->max_miss,
857 in_test->period);
858 if (support == BR_MRP_NONE)
859 return -EOPNOTSUPP;
860
861 if (support == BR_MRP_HW)
862 return 0;
863
864 mrp->in_test_interval = in_test->interval;
865 mrp->in_test_end = jiffies + usecs_to_jiffies(in_test->period);
866 mrp->in_test_max_miss = in_test->max_miss;
867 mrp->in_test_count_miss = 0;
868 queue_delayed_work(system_wq, &mrp->in_test_work,
869 usecs_to_jiffies(in_test->interval));
870
871 return 0;
872 }
873
874 /* Determine if the frame type is a ring frame */
875 static bool br_mrp_ring_frame(struct sk_buff *skb)
876 {
877 const struct br_mrp_tlv_hdr *hdr;
878 struct br_mrp_tlv_hdr _hdr;
879
880 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
881 if (!hdr)
882 return false;
883
884 if (hdr->type == BR_MRP_TLV_HEADER_RING_TEST ||
885 hdr->type == BR_MRP_TLV_HEADER_RING_TOPO ||
886 hdr->type == BR_MRP_TLV_HEADER_RING_LINK_DOWN ||
887 hdr->type == BR_MRP_TLV_HEADER_RING_LINK_UP ||
888 hdr->type == BR_MRP_TLV_HEADER_OPTION)
889 return true;
890
891 return false;
892 }
893
894 /* Determine if the frame type is an interconnect frame */
895 static bool br_mrp_in_frame(struct sk_buff *skb)
896 {
897 const struct br_mrp_tlv_hdr *hdr;
898 struct br_mrp_tlv_hdr _hdr;
899
900 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
901 if (!hdr)
902 return false;
903
904 if (hdr->type == BR_MRP_TLV_HEADER_IN_TEST ||
905 hdr->type == BR_MRP_TLV_HEADER_IN_TOPO ||
906 hdr->type == BR_MRP_TLV_HEADER_IN_LINK_DOWN ||
907 hdr->type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
908 hdr->type == BR_MRP_TLV_HEADER_IN_LINK_STATUS)
909 return true;
910
911 return false;
912 }
913
914 /* Process only MRP Test frame. All the other MRP frames are processed by
915 * userspace application
916 * note: already called with rcu_read_lock
917 */
918 static void br_mrp_mrm_process(struct br_mrp *mrp, struct net_bridge_port *port,
919 struct sk_buff *skb)
920 {
921 const struct br_mrp_tlv_hdr *hdr;
922 struct br_mrp_tlv_hdr _hdr;
923
924 /* Each MRP header starts with a version field which is 16 bits.
925 * Therefore skip the version and get directly the TLV header.
926 */
927 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
928 if (!hdr)
929 return;
930
931 if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST)
932 return;
933
934 mrp->test_count_miss = 0;
935
936 /* Notify the userspace that the ring is closed only when the ring is
937 * not closed
938 */
939 if (mrp->ring_state != BR_MRP_RING_STATE_CLOSED)
940 br_mrp_ring_port_open(port->dev, false);
941 }
942
943 /* Determine if the test hdr has a better priority than the node */
944 static bool br_mrp_test_better_than_own(struct br_mrp *mrp,
945 struct net_bridge *br,
946 const struct br_mrp_ring_test_hdr *hdr)
947 {
948 u16 prio = be16_to_cpu(hdr->prio);
949
950 if (prio < mrp->prio ||
951 (prio == mrp->prio &&
952 ether_addr_to_u64(hdr->sa) < ether_addr_to_u64(br->dev->dev_addr)))
953 return true;
954
955 return false;
956 }
957
958 /* Process only MRP Test frame. All the other MRP frames are processed by
959 * userspace application
960 * note: already called with rcu_read_lock
961 */
962 static void br_mrp_mra_process(struct br_mrp *mrp, struct net_bridge *br,
963 struct net_bridge_port *port,
964 struct sk_buff *skb)
965 {
966 const struct br_mrp_ring_test_hdr *test_hdr;
967 struct br_mrp_ring_test_hdr _test_hdr;
968 const struct br_mrp_tlv_hdr *hdr;
969 struct br_mrp_tlv_hdr _hdr;
970
971 /* Each MRP header starts with a version field which is 16 bits.
972 * Therefore skip the version and get directly the TLV header.
973 */
974 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
975 if (!hdr)
976 return;
977
978 if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST)
979 return;
980
981 test_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
982 sizeof(_test_hdr), &_test_hdr);
983 if (!test_hdr)
984 return;
985
986 /* Only frames that have a better priority than the node will
987 * clear the miss counter because otherwise the node will need to behave
988 * as MRM.
989 */
990 if (br_mrp_test_better_than_own(mrp, br, test_hdr))
991 mrp->test_count_miss = 0;
992 }
993
994 /* Process only MRP InTest frame. All the other MRP frames are processed by
995 * userspace application
996 * note: already called with rcu_read_lock
997 */
998 static bool br_mrp_mim_process(struct br_mrp *mrp, struct net_bridge_port *port,
999 struct sk_buff *skb)
1000 {
1001 const struct br_mrp_in_test_hdr *in_hdr;
1002 struct br_mrp_in_test_hdr _in_hdr;
1003 const struct br_mrp_tlv_hdr *hdr;
1004 struct br_mrp_tlv_hdr _hdr;
1005
1006 /* Each MRP header starts with a version field which is 16 bits.
1007 * Therefore skip the version and get directly the TLV header.
1008 */
1009 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
1010 if (!hdr)
1011 return false;
1012
1013 /* The check for InTest frame type was already done */
1014 in_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
1015 sizeof(_in_hdr), &_in_hdr);
1016 if (!in_hdr)
1017 return false;
1018
1019 /* It needs to process only it's own InTest frames. */
1020 if (mrp->in_id != ntohs(in_hdr->id))
1021 return false;
1022
1023 mrp->in_test_count_miss = 0;
1024
1025 /* Notify the userspace that the ring is closed only when the ring is
1026 * not closed
1027 */
1028 if (mrp->in_state != BR_MRP_IN_STATE_CLOSED)
1029 br_mrp_in_port_open(port->dev, false);
1030
1031 return true;
1032 }
1033
1034 /* Get the MRP frame type
1035 * note: already called with rcu_read_lock
1036 */
1037 static u8 br_mrp_get_frame_type(struct sk_buff *skb)
1038 {
1039 const struct br_mrp_tlv_hdr *hdr;
1040 struct br_mrp_tlv_hdr _hdr;
1041
1042 /* Each MRP header starts with a version field which is 16 bits.
1043 * Therefore skip the version and get directly the TLV header.
1044 */
1045 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
1046 if (!hdr)
1047 return 0xff;
1048
1049 return hdr->type;
1050 }
1051
1052 static bool br_mrp_mrm_behaviour(struct br_mrp *mrp)
1053 {
1054 if (mrp->ring_role == BR_MRP_RING_ROLE_MRM ||
1055 (mrp->ring_role == BR_MRP_RING_ROLE_MRA && !mrp->test_monitor))
1056 return true;
1057
1058 return false;
1059 }
1060
1061 static bool br_mrp_mrc_behaviour(struct br_mrp *mrp)
1062 {
1063 if (mrp->ring_role == BR_MRP_RING_ROLE_MRC ||
1064 (mrp->ring_role == BR_MRP_RING_ROLE_MRA && mrp->test_monitor))
1065 return true;
1066
1067 return false;
1068 }
1069
1070 /* This will just forward the frame to the other mrp ring ports, depending on
1071 * the frame type, ring role and interconnect role
1072 * note: already called with rcu_read_lock
1073 */
1074 static int br_mrp_rcv(struct net_bridge_port *p,
1075 struct sk_buff *skb, struct net_device *dev)
1076 {
1077 struct net_bridge_port *p_port, *s_port, *i_port = NULL;
1078 struct net_bridge_port *p_dst, *s_dst, *i_dst = NULL;
1079 struct net_bridge *br;
1080 struct br_mrp *mrp;
1081
1082 /* If port is disabled don't accept any frames */
1083 if (p->state == BR_STATE_DISABLED)
1084 return 0;
1085
1086 br = p->br;
1087 mrp = br_mrp_find_port(br, p);
1088 if (unlikely(!mrp))
1089 return 0;
1090
1091 p_port = rcu_dereference(mrp->p_port);
1092 if (!p_port)
1093 return 0;
1094 p_dst = p_port;
1095
1096 s_port = rcu_dereference(mrp->s_port);
1097 if (!s_port)
1098 return 0;
1099 s_dst = s_port;
1100
1101 /* If the frame is a ring frame then it is not required to check the
1102 * interconnect role and ports to process or forward the frame
1103 */
1104 if (br_mrp_ring_frame(skb)) {
1105 /* If the role is MRM then don't forward the frames */
1106 if (mrp->ring_role == BR_MRP_RING_ROLE_MRM) {
1107 br_mrp_mrm_process(mrp, p, skb);
1108 goto no_forward;
1109 }
1110
1111 /* If the role is MRA then don't forward the frames if it
1112 * behaves as MRM node
1113 */
1114 if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) {
1115 if (!mrp->test_monitor) {
1116 br_mrp_mrm_process(mrp, p, skb);
1117 goto no_forward;
1118 }
1119
1120 br_mrp_mra_process(mrp, br, p, skb);
1121 }
1122
1123 goto forward;
1124 }
1125
1126 if (br_mrp_in_frame(skb)) {
1127 u8 in_type = br_mrp_get_frame_type(skb);
1128
1129 i_port = rcu_dereference(mrp->i_port);
1130 i_dst = i_port;
1131
1132 /* If the ring port is in block state it should not forward
1133 * In_Test frames
1134 */
1135 if (br_mrp_is_ring_port(p_port, s_port, p) &&
1136 p->state == BR_STATE_BLOCKING &&
1137 in_type == BR_MRP_TLV_HEADER_IN_TEST)
1138 goto no_forward;
1139
1140 /* Nodes that behaves as MRM needs to stop forwarding the
1141 * frames in case the ring is closed, otherwise will be a loop.
1142 * In this case the frame is no forward between the ring ports.
1143 */
1144 if (br_mrp_mrm_behaviour(mrp) &&
1145 br_mrp_is_ring_port(p_port, s_port, p) &&
1146 (s_port->state != BR_STATE_FORWARDING ||
1147 p_port->state != BR_STATE_FORWARDING)) {
1148 p_dst = NULL;
1149 s_dst = NULL;
1150 }
1151
1152 /* A node that behaves as MRC and doesn't have a interconnect
1153 * role then it should forward all frames between the ring ports
1154 * because it doesn't have an interconnect port
1155 */
1156 if (br_mrp_mrc_behaviour(mrp) &&
1157 mrp->in_role == BR_MRP_IN_ROLE_DISABLED)
1158 goto forward;
1159
1160 if (mrp->in_role == BR_MRP_IN_ROLE_MIM) {
1161 if (in_type == BR_MRP_TLV_HEADER_IN_TEST) {
1162 /* MIM should not forward it's own InTest
1163 * frames
1164 */
1165 if (br_mrp_mim_process(mrp, p, skb)) {
1166 goto no_forward;
1167 } else {
1168 if (br_mrp_is_ring_port(p_port, s_port,
1169 p))
1170 i_dst = NULL;
1171
1172 if (br_mrp_is_in_port(i_port, p))
1173 goto no_forward;
1174 }
1175 } else {
1176 /* MIM should forward IntLinkChange/Status and
1177 * IntTopoChange between ring ports but MIM
1178 * should not forward IntLinkChange/Status and
1179 * IntTopoChange if the frame was received at
1180 * the interconnect port
1181 */
1182 if (br_mrp_is_ring_port(p_port, s_port, p))
1183 i_dst = NULL;
1184
1185 if (br_mrp_is_in_port(i_port, p))
1186 goto no_forward;
1187 }
1188 }
1189
1190 if (mrp->in_role == BR_MRP_IN_ROLE_MIC) {
1191 /* MIC should forward InTest frames on all ports
1192 * regardless of the received port
1193 */
1194 if (in_type == BR_MRP_TLV_HEADER_IN_TEST)
1195 goto forward;
1196
1197 /* MIC should forward IntLinkChange frames only if they
1198 * are received on ring ports to all the ports
1199 */
1200 if (br_mrp_is_ring_port(p_port, s_port, p) &&
1201 (in_type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
1202 in_type == BR_MRP_TLV_HEADER_IN_LINK_DOWN))
1203 goto forward;
1204
1205 /* MIC should forward IntLinkStatus frames only to
1206 * interconnect port if it was received on a ring port.
1207 * If it is received on interconnect port then, it
1208 * should be forward on both ring ports
1209 */
1210 if (br_mrp_is_ring_port(p_port, s_port, p) &&
1211 in_type == BR_MRP_TLV_HEADER_IN_LINK_STATUS) {
1212 p_dst = NULL;
1213 s_dst = NULL;
1214 }
1215
1216 /* Should forward the InTopo frames only between the
1217 * ring ports
1218 */
1219 if (in_type == BR_MRP_TLV_HEADER_IN_TOPO) {
1220 i_dst = NULL;
1221 goto forward;
1222 }
1223
1224 /* In all the other cases don't forward the frames */
1225 goto no_forward;
1226 }
1227 }
1228
1229 forward:
1230 if (p_dst)
1231 br_forward(p_dst, skb, true, false);
1232 if (s_dst)
1233 br_forward(s_dst, skb, true, false);
1234 if (i_dst)
1235 br_forward(i_dst, skb, true, false);
1236
1237 no_forward:
1238 return 1;
1239 }
1240
1241 /* Check if the frame was received on a port that is part of MRP ring
1242 * and if the frame has MRP eth. In that case process the frame otherwise do
1243 * normal forwarding.
1244 * note: already called with rcu_read_lock
1245 */
1246 static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1247 {
1248 /* If there is no MRP instance do normal forwarding */
1249 if (likely(!(p->flags & BR_MRP_AWARE)))
1250 goto out;
1251
1252 return br_mrp_rcv(p, skb, p->dev);
1253 out:
1254 return 0;
1255 }
1256
1257 bool br_mrp_enabled(struct net_bridge *br)
1258 {
1259 return !hlist_empty(&br->mrp_list);
1260 }
1261
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