1 // SPDX-License-Identifier: GPL-2.0-or-later
3 #include <linux/mrp_bridge.h>
4 #include "br_private_mrp.h"
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 };
9 static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
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,
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)
27 static bool br_mrp_is_in_port(struct net_bridge_port *i_port,
28 struct net_bridge_port *port)
36 static struct net_bridge_port *br_mrp_get_port(struct net_bridge *br,
39 struct net_bridge_port *res = NULL;
40 struct net_bridge_port *port;
42 list_for_each_entry(port, &br->port_list, list) {
43 if (port->dev->ifindex == ifindex) {
52 static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id)
54 struct br_mrp *res = NULL;
57 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
58 lockdep_rtnl_is_held()) {
59 if (mrp->ring_id == ring_id) {
68 static struct br_mrp *br_mrp_find_in_id(struct net_bridge *br, u32 in_id)
70 struct br_mrp *res = NULL;
73 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
74 lockdep_rtnl_is_held()) {
75 if (mrp->in_id == in_id) {
84 static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
88 hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
89 lockdep_rtnl_is_held()) {
90 struct net_bridge_port *p;
92 p = rtnl_dereference(mrp->p_port);
93 if (p && p->dev->ifindex == ifindex)
96 p = rtnl_dereference(mrp->s_port);
97 if (p && p->dev->ifindex == ifindex)
100 p = rtnl_dereference(mrp->i_port);
101 if (p && p->dev->ifindex == ifindex)
108 static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
109 struct net_bridge_port *p)
111 struct br_mrp *res = NULL;
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) {
127 static int br_mrp_next_seq(struct br_mrp *mrp)
133 static struct sk_buff *br_mrp_skb_alloc(struct net_bridge_port *p,
134 const u8 *src, const u8 *dst)
136 struct ethhdr *eth_hdr;
140 skb = dev_alloc_skb(MRP_MAX_FRAME_LENGTH);
145 skb->protocol = htons(ETH_P_MRP);
146 skb->priority = MRP_FRAME_PRIO;
147 skb_reserve(skb, sizeof(*eth_hdr));
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);
154 version = skb_put(skb, sizeof(*version));
155 *version = cpu_to_be16(MRP_VERSION);
160 static void br_mrp_skb_tlv(struct sk_buff *skb,
161 enum br_mrp_tlv_header_type type,
164 struct br_mrp_tlv_hdr *hdr;
166 hdr = skb_put(skb, sizeof(*hdr));
168 hdr->length = length;
171 static void br_mrp_skb_common(struct sk_buff *skb, struct br_mrp *mrp)
173 struct br_mrp_common_hdr *hdr;
175 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_COMMON, sizeof(*hdr));
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);
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)
186 struct br_mrp_ring_test_hdr *hdr = NULL;
187 struct sk_buff *skb = NULL;
192 skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_test_dmac);
196 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_RING_TEST, sizeof(*hdr));
197 hdr = skb_put(skb, sizeof(*hdr));
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));
206 br_mrp_skb_common(skb, mrp);
207 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
212 static struct sk_buff *br_mrp_alloc_in_test_skb(struct br_mrp *mrp,
213 struct net_bridge_port *p,
214 enum br_mrp_port_role_type port_role)
216 struct br_mrp_in_test_hdr *hdr = NULL;
217 struct sk_buff *skb = NULL;
222 skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_in_test_dmac);
226 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_IN_TEST, sizeof(*hdr));
227 hdr = skb_put(skb, sizeof(*hdr));
229 hdr->id = cpu_to_be16(mrp->in_id);
230 ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
231 hdr->port_role = cpu_to_be16(port_role);
232 hdr->state = cpu_to_be16(mrp->in_state);
233 hdr->transitions = cpu_to_be16(mrp->in_transitions);
234 hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies));
236 br_mrp_skb_common(skb, mrp);
237 br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
242 /* This function is continuously called in the following cases:
243 * - when node role is MRM, in this case test_monitor is always set to false
244 * because it needs to notify the userspace that the ring is open and needs to
245 * send MRP_Test frames
246 * - when node role is MRA, there are 2 subcases:
247 * - when MRA behaves as MRM, in this case is similar with MRM role
248 * - when MRA behaves as MRC, in this case test_monitor is set to true,
249 * because it needs to detect when it stops seeing MRP_Test frames
250 * from MRM node but it doesn't need to send MRP_Test frames.
252 static void br_mrp_test_work_expired(struct work_struct *work)
254 struct delayed_work *del_work = to_delayed_work(work);
255 struct br_mrp *mrp = container_of(del_work, struct br_mrp, test_work);
256 struct net_bridge_port *p;
257 bool notify_open = false;
260 if (time_before_eq(mrp->test_end, jiffies))
263 if (mrp->test_count_miss < mrp->test_max_miss) {
264 mrp->test_count_miss++;
266 /* Notify that the ring is open only if the ring state is
267 * closed, otherwise it would continue to notify at every
269 * Also notify that the ring is open when the node has the
270 * role MRA and behaves as MRC. The reason is that the
271 * userspace needs to know when the MRM stopped sending
272 * MRP_Test frames so that the current node to try to take
275 if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED ||
282 p = rcu_dereference(mrp->p_port);
284 if (!mrp->test_monitor) {
285 skb = br_mrp_alloc_test_skb(mrp, p,
286 BR_MRP_PORT_ROLE_PRIMARY);
290 skb_reset_network_header(skb);
294 if (notify_open && !mrp->ring_role_offloaded)
295 br_mrp_ring_port_open(p->dev, true);
298 p = rcu_dereference(mrp->s_port);
300 if (!mrp->test_monitor) {
301 skb = br_mrp_alloc_test_skb(mrp, p,
302 BR_MRP_PORT_ROLE_SECONDARY);
306 skb_reset_network_header(skb);
310 if (notify_open && !mrp->ring_role_offloaded)
311 br_mrp_ring_port_open(p->dev, true);
317 queue_delayed_work(system_wq, &mrp->test_work,
318 usecs_to_jiffies(mrp->test_interval));
321 /* This function is continuously called when the node has the interconnect role
322 * MIM. It would generate interconnect test frames and will send them on all 3
323 * ports. But will also check if it stop receiving interconnect test frames.
325 static void br_mrp_in_test_work_expired(struct work_struct *work)
327 struct delayed_work *del_work = to_delayed_work(work);
328 struct br_mrp *mrp = container_of(del_work, struct br_mrp, in_test_work);
329 struct net_bridge_port *p;
330 bool notify_open = false;
333 if (time_before_eq(mrp->in_test_end, jiffies))
336 if (mrp->in_test_count_miss < mrp->in_test_max_miss) {
337 mrp->in_test_count_miss++;
339 /* Notify that the interconnect ring is open only if the
340 * interconnect ring state is closed, otherwise it would
341 * continue to notify at every interval.
343 if (mrp->in_state == BR_MRP_IN_STATE_CLOSED)
349 p = rcu_dereference(mrp->p_port);
351 skb = br_mrp_alloc_in_test_skb(mrp, p,
352 BR_MRP_PORT_ROLE_PRIMARY);
356 skb_reset_network_header(skb);
359 if (notify_open && !mrp->in_role_offloaded)
360 br_mrp_in_port_open(p->dev, true);
363 p = rcu_dereference(mrp->s_port);
365 skb = br_mrp_alloc_in_test_skb(mrp, p,
366 BR_MRP_PORT_ROLE_SECONDARY);
370 skb_reset_network_header(skb);
373 if (notify_open && !mrp->in_role_offloaded)
374 br_mrp_in_port_open(p->dev, true);
377 p = rcu_dereference(mrp->i_port);
379 skb = br_mrp_alloc_in_test_skb(mrp, p,
380 BR_MRP_PORT_ROLE_INTER);
384 skb_reset_network_header(skb);
387 if (notify_open && !mrp->in_role_offloaded)
388 br_mrp_in_port_open(p->dev, true);
394 queue_delayed_work(system_wq, &mrp->in_test_work,
395 usecs_to_jiffies(mrp->in_test_interval));
398 /* Deletes the MRP instance.
399 * note: called under rtnl_lock
401 static void br_mrp_del_impl(struct net_bridge *br, struct br_mrp *mrp)
403 struct net_bridge_port *p;
406 /* Stop sending MRP_Test frames */
407 cancel_delayed_work_sync(&mrp->test_work);
408 br_mrp_switchdev_send_ring_test(br, mrp, 0, 0, 0, 0);
410 /* Stop sending MRP_InTest frames if has an interconnect role */
411 cancel_delayed_work_sync(&mrp->in_test_work);
412 br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
414 /* Disable the roles */
415 br_mrp_switchdev_set_ring_role(br, mrp, BR_MRP_RING_ROLE_DISABLED);
416 p = rtnl_dereference(mrp->i_port);
418 br_mrp_switchdev_set_in_role(br, mrp, mrp->in_id, mrp->ring_id,
419 BR_MRP_IN_ROLE_DISABLED);
421 br_mrp_switchdev_del(br, mrp);
423 /* Reset the ports */
424 p = rtnl_dereference(mrp->p_port);
426 spin_lock_bh(&br->lock);
427 state = netif_running(br->dev) ?
428 BR_STATE_FORWARDING : BR_STATE_DISABLED;
430 p->flags &= ~BR_MRP_AWARE;
431 spin_unlock_bh(&br->lock);
432 br_mrp_port_switchdev_set_state(p, state);
433 rcu_assign_pointer(mrp->p_port, NULL);
436 p = rtnl_dereference(mrp->s_port);
438 spin_lock_bh(&br->lock);
439 state = netif_running(br->dev) ?
440 BR_STATE_FORWARDING : BR_STATE_DISABLED;
442 p->flags &= ~BR_MRP_AWARE;
443 spin_unlock_bh(&br->lock);
444 br_mrp_port_switchdev_set_state(p, state);
445 rcu_assign_pointer(mrp->s_port, NULL);
448 p = rtnl_dereference(mrp->i_port);
450 spin_lock_bh(&br->lock);
451 state = netif_running(br->dev) ?
452 BR_STATE_FORWARDING : BR_STATE_DISABLED;
454 p->flags &= ~BR_MRP_AWARE;
455 spin_unlock_bh(&br->lock);
456 br_mrp_port_switchdev_set_state(p, state);
457 rcu_assign_pointer(mrp->i_port, NULL);
460 hlist_del_rcu(&mrp->list);
463 if (hlist_empty(&br->mrp_list))
464 br_del_frame(br, &mrp_frame_type);
467 /* Adds a new MRP instance.
468 * note: called under rtnl_lock
470 int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
472 struct net_bridge_port *p;
476 /* If the ring exists, it is not possible to create another one with the
479 mrp = br_mrp_find_id(br, instance->ring_id);
483 if (!br_mrp_get_port(br, instance->p_ifindex) ||
484 !br_mrp_get_port(br, instance->s_ifindex))
487 /* It is not possible to have the same port part of multiple rings */
488 if (!br_mrp_unique_ifindex(br, instance->p_ifindex) ||
489 !br_mrp_unique_ifindex(br, instance->s_ifindex))
492 mrp = kzalloc(sizeof(*mrp), GFP_KERNEL);
496 mrp->ring_id = instance->ring_id;
497 mrp->prio = instance->prio;
499 p = br_mrp_get_port(br, instance->p_ifindex);
500 spin_lock_bh(&br->lock);
501 p->state = BR_STATE_FORWARDING;
502 p->flags |= BR_MRP_AWARE;
503 spin_unlock_bh(&br->lock);
504 rcu_assign_pointer(mrp->p_port, p);
506 p = br_mrp_get_port(br, instance->s_ifindex);
507 spin_lock_bh(&br->lock);
508 p->state = BR_STATE_FORWARDING;
509 p->flags |= BR_MRP_AWARE;
510 spin_unlock_bh(&br->lock);
511 rcu_assign_pointer(mrp->s_port, p);
513 if (hlist_empty(&br->mrp_list))
514 br_add_frame(br, &mrp_frame_type);
516 INIT_DELAYED_WORK(&mrp->test_work, br_mrp_test_work_expired);
517 INIT_DELAYED_WORK(&mrp->in_test_work, br_mrp_in_test_work_expired);
518 hlist_add_tail_rcu(&mrp->list, &br->mrp_list);
520 err = br_mrp_switchdev_add(br, mrp);
527 br_mrp_del_impl(br, mrp);
532 /* Deletes the MRP instance from which the port is part of
533 * note: called under rtnl_lock
535 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p)
537 struct br_mrp *mrp = br_mrp_find_port(br, p);
539 /* If the port is not part of a MRP instance just bail out */
543 br_mrp_del_impl(br, mrp);
546 /* Deletes existing MRP instance based on ring_id
547 * note: called under rtnl_lock
549 int br_mrp_del(struct net_bridge *br, struct br_mrp_instance *instance)
551 struct br_mrp *mrp = br_mrp_find_id(br, instance->ring_id);
556 br_mrp_del_impl(br, mrp);
561 /* Set port state, port state can be forwarding, blocked or disabled
562 * note: already called with rtnl_lock
564 int br_mrp_set_port_state(struct net_bridge_port *p,
565 enum br_mrp_port_state_type state)
569 if (!p || !(p->flags & BR_MRP_AWARE))
572 spin_lock_bh(&p->br->lock);
574 if (state == BR_MRP_PORT_STATE_FORWARDING)
575 port_state = BR_STATE_FORWARDING;
577 port_state = BR_STATE_BLOCKING;
579 p->state = port_state;
580 spin_unlock_bh(&p->br->lock);
582 br_mrp_port_switchdev_set_state(p, port_state);
587 /* Set port role, port role can be primary or secondary
588 * note: already called with rtnl_lock
590 int br_mrp_set_port_role(struct net_bridge_port *p,
591 enum br_mrp_port_role_type role)
595 if (!p || !(p->flags & BR_MRP_AWARE))
598 mrp = br_mrp_find_port(p->br, p);
604 case BR_MRP_PORT_ROLE_PRIMARY:
605 rcu_assign_pointer(mrp->p_port, p);
607 case BR_MRP_PORT_ROLE_SECONDARY:
608 rcu_assign_pointer(mrp->s_port, p);
614 br_mrp_port_switchdev_set_role(p, role);
619 /* Set ring state, ring state can be only Open or Closed
620 * note: already called with rtnl_lock
622 int br_mrp_set_ring_state(struct net_bridge *br,
623 struct br_mrp_ring_state *state)
625 struct br_mrp *mrp = br_mrp_find_id(br, state->ring_id);
630 if (mrp->ring_state != state->ring_state)
631 mrp->ring_transitions++;
633 mrp->ring_state = state->ring_state;
635 br_mrp_switchdev_set_ring_state(br, mrp, state->ring_state);
640 /* Set ring role, ring role can be only MRM(Media Redundancy Manager) or
641 * MRC(Media Redundancy Client).
642 * note: already called with rtnl_lock
644 int br_mrp_set_ring_role(struct net_bridge *br,
645 struct br_mrp_ring_role *role)
647 struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
648 enum br_mrp_hw_support support;
653 mrp->ring_role = role->ring_role;
655 /* If there is an error just bailed out */
656 support = br_mrp_switchdev_set_ring_role(br, mrp, role->ring_role);
657 if (support == BR_MRP_NONE)
660 /* Now detect if the HW actually applied the role or not. If the HW
661 * applied the role it means that the SW will not to do those operations
662 * anymore. For example if the role ir MRM then the HW will notify the
663 * SW when ring is open, but if the is not pushed to the HW the SW will
664 * need to detect when the ring is open
666 mrp->ring_role_offloaded = support == BR_MRP_SW ? 0 : 1;
671 /* Start to generate or monitor MRP test frames, the frames are generated by
672 * HW and if it fails, they are generated by the SW.
673 * note: already called with rtnl_lock
675 int br_mrp_start_test(struct net_bridge *br,
676 struct br_mrp_start_test *test)
678 struct br_mrp *mrp = br_mrp_find_id(br, test->ring_id);
679 enum br_mrp_hw_support support;
684 /* Try to push it to the HW and if it fails then continue with SW
685 * implementation and if that also fails then return error.
687 support = br_mrp_switchdev_send_ring_test(br, mrp, test->interval,
688 test->max_miss, test->period,
690 if (support == BR_MRP_NONE)
693 if (support == BR_MRP_HW)
696 mrp->test_interval = test->interval;
697 mrp->test_end = jiffies + usecs_to_jiffies(test->period);
698 mrp->test_max_miss = test->max_miss;
699 mrp->test_monitor = test->monitor;
700 mrp->test_count_miss = 0;
701 queue_delayed_work(system_wq, &mrp->test_work,
702 usecs_to_jiffies(test->interval));
707 /* Set in state, int state can be only Open or Closed
708 * note: already called with rtnl_lock
710 int br_mrp_set_in_state(struct net_bridge *br, struct br_mrp_in_state *state)
712 struct br_mrp *mrp = br_mrp_find_in_id(br, state->in_id);
717 if (mrp->in_state != state->in_state)
718 mrp->in_transitions++;
720 mrp->in_state = state->in_state;
722 br_mrp_switchdev_set_in_state(br, mrp, state->in_state);
727 /* Set in role, in role can be only MIM(Media Interconnection Manager) or
728 * MIC(Media Interconnection Client).
729 * note: already called with rtnl_lock
731 int br_mrp_set_in_role(struct net_bridge *br, struct br_mrp_in_role *role)
733 struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
734 enum br_mrp_hw_support support;
735 struct net_bridge_port *p;
740 if (!br_mrp_get_port(br, role->i_ifindex))
743 if (role->in_role == BR_MRP_IN_ROLE_DISABLED) {
746 /* It is not allowed to disable a port that doesn't exist */
747 p = rtnl_dereference(mrp->i_port);
751 /* Stop the generating MRP_InTest frames */
752 cancel_delayed_work_sync(&mrp->in_test_work);
753 br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
755 /* Remove the port */
756 spin_lock_bh(&br->lock);
757 state = netif_running(br->dev) ?
758 BR_STATE_FORWARDING : BR_STATE_DISABLED;
760 p->flags &= ~BR_MRP_AWARE;
761 spin_unlock_bh(&br->lock);
762 br_mrp_port_switchdev_set_state(p, state);
763 rcu_assign_pointer(mrp->i_port, NULL);
765 mrp->in_role = role->in_role;
771 /* It is not possible to have the same port part of multiple rings */
772 if (!br_mrp_unique_ifindex(br, role->i_ifindex))
775 /* It is not allowed to set a different interconnect port if the mrp
776 * instance has already one. First it needs to be disabled and after
777 * that set the new port
779 if (rcu_access_pointer(mrp->i_port))
782 p = br_mrp_get_port(br, role->i_ifindex);
783 spin_lock_bh(&br->lock);
784 p->state = BR_STATE_FORWARDING;
785 p->flags |= BR_MRP_AWARE;
786 spin_unlock_bh(&br->lock);
787 rcu_assign_pointer(mrp->i_port, p);
789 mrp->in_role = role->in_role;
790 mrp->in_id = role->in_id;
792 /* If there is an error just bailed out */
793 support = br_mrp_switchdev_set_in_role(br, mrp, role->in_id,
794 role->ring_id, role->in_role);
795 if (support == BR_MRP_NONE)
798 /* Now detect if the HW actually applied the role or not. If the HW
799 * applied the role it means that the SW will not to do those operations
800 * anymore. For example if the role is MIM then the HW will notify the
801 * SW when interconnect ring is open, but if the is not pushed to the HW
802 * the SW will need to detect when the interconnect ring is open.
804 mrp->in_role_offloaded = support == BR_MRP_SW ? 0 : 1;
809 /* Start to generate MRP_InTest frames, the frames are generated by
810 * HW and if it fails, they are generated by the SW.
811 * note: already called with rtnl_lock
813 int br_mrp_start_in_test(struct net_bridge *br,
814 struct br_mrp_start_in_test *in_test)
816 struct br_mrp *mrp = br_mrp_find_in_id(br, in_test->in_id);
817 enum br_mrp_hw_support support;
822 if (mrp->in_role != BR_MRP_IN_ROLE_MIM)
825 /* Try to push it to the HW and if it fails then continue with SW
826 * implementation and if that also fails then return error.
828 support = br_mrp_switchdev_send_in_test(br, mrp, in_test->interval,
831 if (support == BR_MRP_NONE)
834 if (support == BR_MRP_HW)
837 mrp->in_test_interval = in_test->interval;
838 mrp->in_test_end = jiffies + usecs_to_jiffies(in_test->period);
839 mrp->in_test_max_miss = in_test->max_miss;
840 mrp->in_test_count_miss = 0;
841 queue_delayed_work(system_wq, &mrp->in_test_work,
842 usecs_to_jiffies(in_test->interval));
847 /* Determine if the frame type is a ring frame */
848 static bool br_mrp_ring_frame(struct sk_buff *skb)
850 const struct br_mrp_tlv_hdr *hdr;
851 struct br_mrp_tlv_hdr _hdr;
853 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
857 if (hdr->type == BR_MRP_TLV_HEADER_RING_TEST ||
858 hdr->type == BR_MRP_TLV_HEADER_RING_TOPO ||
859 hdr->type == BR_MRP_TLV_HEADER_RING_LINK_DOWN ||
860 hdr->type == BR_MRP_TLV_HEADER_RING_LINK_UP ||
861 hdr->type == BR_MRP_TLV_HEADER_OPTION)
867 /* Determine if the frame type is an interconnect frame */
868 static bool br_mrp_in_frame(struct sk_buff *skb)
870 const struct br_mrp_tlv_hdr *hdr;
871 struct br_mrp_tlv_hdr _hdr;
873 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
877 if (hdr->type == BR_MRP_TLV_HEADER_IN_TEST ||
878 hdr->type == BR_MRP_TLV_HEADER_IN_TOPO ||
879 hdr->type == BR_MRP_TLV_HEADER_IN_LINK_DOWN ||
880 hdr->type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
881 hdr->type == BR_MRP_TLV_HEADER_IN_LINK_STATUS)
887 /* Process only MRP Test frame. All the other MRP frames are processed by
888 * userspace application
889 * note: already called with rcu_read_lock
891 static void br_mrp_mrm_process(struct br_mrp *mrp, struct net_bridge_port *port,
894 const struct br_mrp_tlv_hdr *hdr;
895 struct br_mrp_tlv_hdr _hdr;
897 /* Each MRP header starts with a version field which is 16 bits.
898 * Therefore skip the version and get directly the TLV header.
900 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
904 if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST)
907 mrp->test_count_miss = 0;
909 /* Notify the userspace that the ring is closed only when the ring is
912 if (mrp->ring_state != BR_MRP_RING_STATE_CLOSED)
913 br_mrp_ring_port_open(port->dev, false);
916 /* Determine if the test hdr has a better priority than the node */
917 static bool br_mrp_test_better_than_own(struct br_mrp *mrp,
918 struct net_bridge *br,
919 const struct br_mrp_ring_test_hdr *hdr)
921 u16 prio = be16_to_cpu(hdr->prio);
923 if (prio < mrp->prio ||
924 (prio == mrp->prio &&
925 ether_addr_to_u64(hdr->sa) < ether_addr_to_u64(br->dev->dev_addr)))
931 /* Process only MRP Test frame. All the other MRP frames are processed by
932 * userspace application
933 * note: already called with rcu_read_lock
935 static void br_mrp_mra_process(struct br_mrp *mrp, struct net_bridge *br,
936 struct net_bridge_port *port,
939 const struct br_mrp_ring_test_hdr *test_hdr;
940 struct br_mrp_ring_test_hdr _test_hdr;
941 const struct br_mrp_tlv_hdr *hdr;
942 struct br_mrp_tlv_hdr _hdr;
944 /* Each MRP header starts with a version field which is 16 bits.
945 * Therefore skip the version and get directly the TLV header.
947 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
951 if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST)
954 test_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
955 sizeof(_test_hdr), &_test_hdr);
959 /* Only frames that have a better priority than the node will
960 * clear the miss counter because otherwise the node will need to behave
963 if (br_mrp_test_better_than_own(mrp, br, test_hdr))
964 mrp->test_count_miss = 0;
967 /* Process only MRP InTest frame. All the other MRP frames are processed by
968 * userspace application
969 * note: already called with rcu_read_lock
971 static bool br_mrp_mim_process(struct br_mrp *mrp, struct net_bridge_port *port,
974 const struct br_mrp_in_test_hdr *in_hdr;
975 struct br_mrp_in_test_hdr _in_hdr;
976 const struct br_mrp_tlv_hdr *hdr;
977 struct br_mrp_tlv_hdr _hdr;
979 /* Each MRP header starts with a version field which is 16 bits.
980 * Therefore skip the version and get directly the TLV header.
982 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
986 /* The check for InTest frame type was already done */
987 in_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
988 sizeof(_in_hdr), &_in_hdr);
992 /* It needs to process only it's own InTest frames. */
993 if (mrp->in_id != ntohs(in_hdr->id))
996 mrp->in_test_count_miss = 0;
998 /* Notify the userspace that the ring is closed only when the ring is
1001 if (mrp->in_state != BR_MRP_IN_STATE_CLOSED)
1002 br_mrp_in_port_open(port->dev, false);
1007 /* Get the MRP frame type
1008 * note: already called with rcu_read_lock
1010 static u8 br_mrp_get_frame_type(struct sk_buff *skb)
1012 const struct br_mrp_tlv_hdr *hdr;
1013 struct br_mrp_tlv_hdr _hdr;
1015 /* Each MRP header starts with a version field which is 16 bits.
1016 * Therefore skip the version and get directly the TLV header.
1018 hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
1025 static bool br_mrp_mrm_behaviour(struct br_mrp *mrp)
1027 if (mrp->ring_role == BR_MRP_RING_ROLE_MRM ||
1028 (mrp->ring_role == BR_MRP_RING_ROLE_MRA && !mrp->test_monitor))
1034 static bool br_mrp_mrc_behaviour(struct br_mrp *mrp)
1036 if (mrp->ring_role == BR_MRP_RING_ROLE_MRC ||
1037 (mrp->ring_role == BR_MRP_RING_ROLE_MRA && mrp->test_monitor))
1043 /* This will just forward the frame to the other mrp ring ports, depending on
1044 * the frame type, ring role and interconnect role
1045 * note: already called with rcu_read_lock
1047 static int br_mrp_rcv(struct net_bridge_port *p,
1048 struct sk_buff *skb, struct net_device *dev)
1050 struct net_bridge_port *p_port, *s_port, *i_port = NULL;
1051 struct net_bridge_port *p_dst, *s_dst, *i_dst = NULL;
1052 struct net_bridge *br;
1055 /* If port is disabled don't accept any frames */
1056 if (p->state == BR_STATE_DISABLED)
1060 mrp = br_mrp_find_port(br, p);
1064 p_port = rcu_dereference(mrp->p_port);
1069 s_port = rcu_dereference(mrp->s_port);
1074 /* If the frame is a ring frame then it is not required to check the
1075 * interconnect role and ports to process or forward the frame
1077 if (br_mrp_ring_frame(skb)) {
1078 /* If the role is MRM then don't forward the frames */
1079 if (mrp->ring_role == BR_MRP_RING_ROLE_MRM) {
1080 br_mrp_mrm_process(mrp, p, skb);
1084 /* If the role is MRA then don't forward the frames if it
1085 * behaves as MRM node
1087 if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) {
1088 if (!mrp->test_monitor) {
1089 br_mrp_mrm_process(mrp, p, skb);
1093 br_mrp_mra_process(mrp, br, p, skb);
1099 if (br_mrp_in_frame(skb)) {
1100 u8 in_type = br_mrp_get_frame_type(skb);
1102 i_port = rcu_dereference(mrp->i_port);
1105 /* If the ring port is in block state it should not forward
1108 if (br_mrp_is_ring_port(p_port, s_port, p) &&
1109 p->state == BR_STATE_BLOCKING &&
1110 in_type == BR_MRP_TLV_HEADER_IN_TEST)
1113 /* Nodes that behaves as MRM needs to stop forwarding the
1114 * frames in case the ring is closed, otherwise will be a loop.
1115 * In this case the frame is no forward between the ring ports.
1117 if (br_mrp_mrm_behaviour(mrp) &&
1118 br_mrp_is_ring_port(p_port, s_port, p) &&
1119 (s_port->state != BR_STATE_FORWARDING ||
1120 p_port->state != BR_STATE_FORWARDING)) {
1125 /* A node that behaves as MRC and doesn't have a interconnect
1126 * role then it should forward all frames between the ring ports
1127 * because it doesn't have an interconnect port
1129 if (br_mrp_mrc_behaviour(mrp) &&
1130 mrp->in_role == BR_MRP_IN_ROLE_DISABLED)
1133 if (mrp->in_role == BR_MRP_IN_ROLE_MIM) {
1134 if (in_type == BR_MRP_TLV_HEADER_IN_TEST) {
1135 /* MIM should not forward it's own InTest
1138 if (br_mrp_mim_process(mrp, p, skb)) {
1141 if (br_mrp_is_ring_port(p_port, s_port,
1145 if (br_mrp_is_in_port(i_port, p))
1149 /* MIM should forward IntLinkChange/Status and
1150 * IntTopoChange between ring ports but MIM
1151 * should not forward IntLinkChange/Status and
1152 * IntTopoChange if the frame was received at
1153 * the interconnect port
1155 if (br_mrp_is_ring_port(p_port, s_port, p))
1158 if (br_mrp_is_in_port(i_port, p))
1163 if (mrp->in_role == BR_MRP_IN_ROLE_MIC) {
1164 /* MIC should forward InTest frames on all ports
1165 * regardless of the received port
1167 if (in_type == BR_MRP_TLV_HEADER_IN_TEST)
1170 /* MIC should forward IntLinkChange frames only if they
1171 * are received on ring ports to all the ports
1173 if (br_mrp_is_ring_port(p_port, s_port, p) &&
1174 (in_type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
1175 in_type == BR_MRP_TLV_HEADER_IN_LINK_DOWN))
1178 /* MIC should forward IntLinkStatus frames only to
1179 * interconnect port if it was received on a ring port.
1180 * If it is received on interconnect port then, it
1181 * should be forward on both ring ports
1183 if (br_mrp_is_ring_port(p_port, s_port, p) &&
1184 in_type == BR_MRP_TLV_HEADER_IN_LINK_STATUS) {
1189 /* Should forward the InTopo frames only between the
1192 if (in_type == BR_MRP_TLV_HEADER_IN_TOPO) {
1197 /* In all the other cases don't forward the frames */
1204 br_forward(p_dst, skb, true, false);
1206 br_forward(s_dst, skb, true, false);
1208 br_forward(i_dst, skb, true, false);
1214 /* Check if the frame was received on a port that is part of MRP ring
1215 * and if the frame has MRP eth. In that case process the frame otherwise do
1216 * normal forwarding.
1217 * note: already called with rcu_read_lock
1219 static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1221 /* If there is no MRP instance do normal forwarding */
1222 if (likely(!(p->flags & BR_MRP_AWARE)))
1225 return br_mrp_rcv(p, skb, p->dev);
1230 bool br_mrp_enabled(struct net_bridge *br)
1232 return !hlist_empty(&br->mrp_list);