2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2017, Intel Corporation.
6 * This file is part of Lustre, https://wiki.whamcloud.com/
8 * Portals is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Portals is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Portals; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define DEBUG_SUBSYSTEM S_LNET
25 #include <linux/random.h>
26 #include <lnet/lib-lnet.h>
28 #define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
29 #define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4)
30 #define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */
31 #define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
32 #define LNET_NRB_SMALL_PAGES 1
33 #define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
34 #define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
35 #define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_SIZE - 1) >> \
38 static char *forwarding = "";
39 module_param(forwarding, charp, 0444);
40 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
42 static int tiny_router_buffers;
43 module_param(tiny_router_buffers, int, 0444);
44 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
45 static int small_router_buffers;
46 module_param(small_router_buffers, int, 0444);
47 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
48 static int large_router_buffers;
49 module_param(large_router_buffers, int, 0444);
50 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
51 static int peer_buffer_credits;
52 module_param(peer_buffer_credits, int, 0444);
53 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
55 static int auto_down = 1;
56 module_param(auto_down, int, 0444);
57 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
60 lnet_peer_buffer_credits(struct lnet_net *net)
62 /* NI option overrides LNet default */
63 if (net->net_tunables.lct_peer_rtr_credits > 0)
64 return net->net_tunables.lct_peer_rtr_credits;
65 if (peer_buffer_credits > 0)
66 return peer_buffer_credits;
68 /* As an approximation, allow this peer the same number of router
69 * buffers as it is allowed outstanding sends */
70 return net->net_tunables.lct_peer_tx_credits;
73 static int check_routers_before_use;
74 module_param(check_routers_before_use, int, 0444);
75 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
77 int avoid_asym_router_failure = 1;
78 module_param(avoid_asym_router_failure, int, 0644);
79 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
81 int dead_router_check_interval = INT_MIN;
82 module_param(dead_router_check_interval, int, 0444);
83 MODULE_PARM_DESC(dead_router_check_interval, "(DEPRECATED - Use alive_router_check_interval)");
85 int live_router_check_interval = INT_MIN;
86 module_param(live_router_check_interval, int, 0444);
87 MODULE_PARM_DESC(live_router_check_interval, "(DEPRECATED - Use alive_router_check_interval)");
89 int alive_router_check_interval = 60;
90 module_param(alive_router_check_interval, int, 0644);
91 MODULE_PARM_DESC(alive_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
93 static int router_ping_timeout = 50;
94 module_param(router_ping_timeout, int, 0644);
95 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
98 * A value between 0 and 100. 0 meaning that even if router's interfaces
99 * have the worse health still consider the gateway usable.
100 * 100 means that at least one interface on the route's remote net is 100%
101 * healthy to consider the route alive.
102 * The default is set to 100 to ensure we maintain the original behavior.
104 unsigned int router_sensitivity_percentage = 100;
105 static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
106 static struct kernel_param_ops param_ops_rtr_sensitivity = {
107 .set = rtr_sensitivity_set,
108 .get = param_get_int,
110 #define param_check_rtr_sensitivity(name, p) \
111 __param_check(name, p, int)
112 #ifdef HAVE_KERNEL_PARAM_OPS
113 module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR);
115 module_param_call(router_sensitivity_percentage, rtr_sensitivity_set, param_get_int,
116 &router_sensitivity_percentage, S_IRUGO|S_IWUSR);
118 MODULE_PARM_DESC(router_sensitivity_percentage,
119 "How healthy a gateway should be to be used in percent");
122 rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
125 unsigned *sen = (unsigned *)kp->arg;
128 rc = kstrtoul(val, 0, &value);
130 CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
134 if (value < 0 || value > 100) {
135 CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
140 * The purpose of locking the api_mutex here is to ensure that
141 * the correct value ends up stored properly.
143 mutex_lock(&the_lnet.ln_api_mutex);
147 mutex_unlock(&the_lnet.ln_api_mutex);
153 lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target)
155 struct lnet_route *route;
157 lnet_net_lock(LNET_LOCK_EX);
158 target->lp_rtr_refcount += src->lp_rtr_refcount;
159 /* move the list of queued messages to the new peer */
160 list_splice_init(&src->lp_rtrq, &target->lp_rtrq);
161 /* move all the routes that reference the peer */
162 list_splice_init(&src->lp_routes, &target->lp_routes);
163 /* update all the routes to point to the new peer */
164 list_for_each_entry(route, &target->lp_routes, lr_gwlist)
165 route->lr_gateway = target;
166 /* remove the old peer from the ln_routers list */
167 list_del_init(&src->lp_rtr_list);
168 /* add the new peer to the ln_routers list */
169 if (list_empty(&target->lp_rtr_list)) {
170 lnet_peer_addref_locked(target);
171 list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers);
173 /* reset the ref count on the old peer and decrement its ref count */
174 src->lp_rtr_refcount = 0;
175 lnet_peer_decref_locked(src);
176 /* update the router version */
177 the_lnet.ln_routers_version++;
178 lnet_net_unlock(LNET_LOCK_EX);
182 lnet_peers_start_down(void)
184 return check_routers_before_use;
188 * A net is alive if at least one gateway NI on the network is alive.
191 lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
193 struct lnet_peer_ni *lpni;
195 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
196 if (lnet_is_peer_ni_alive(lpni))
204 * a gateway is alive only if all its nets are alive
205 * called with cpt lock held
207 bool lnet_is_gateway_alive(struct lnet_peer *gw)
209 struct lnet_peer_net *lpn;
211 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
212 if (!lnet_is_gateway_net_alive(lpn))
220 * lnet_is_route_alive() needs to be called with cpt lock held
221 * A route is alive if the gateway can route between the local network and
222 * the remote network of the route.
223 * This means at least one NI is alive on each of the local and remote
224 * networks of the gateway.
226 bool lnet_is_route_alive(struct lnet_route *route)
228 struct lnet_peer *gw = route->lr_gateway;
229 struct lnet_peer_net *llpn;
230 struct lnet_peer_net *rlpn;
234 * if discovery is disabled then rely on the cached aliveness
235 * information. This is handicapped information which we log when
236 * we receive the discovery ping response. The most uptodate
237 * aliveness information can only be obtained when discovery is
240 if (lnet_is_discovery_disabled(gw))
241 return route->lr_alive;
244 * check the gateway's interfaces on the route rnet to make sure
245 * that the gateway is viable.
247 llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
251 route_alive = lnet_is_gateway_net_alive(llpn);
253 if (avoid_asym_router_failure) {
254 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
257 route_alive = route_alive &&
258 lnet_is_gateway_net_alive(rlpn);
264 spin_lock(&gw->lp_lock);
265 if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
266 if (gw->lp_rtr_refcount > 0)
267 CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
268 libcfs_nid2str(gw->lp_primary_nid));
271 spin_unlock(&gw->lp_lock);
277 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
278 struct lnet_peer *new_lp)
280 struct lnet_peer_ni *lpni;
281 struct lnet_route *route;
284 * Although a route is correlated with a peer, but when it's added
285 * a specific NID is used. That NID refers to a peer_ni within
286 * a peer. There could be other peer_nis on the same net, which
287 * can be used to send to that gateway. However when we are
288 * consolidating gateways because of discovery, the nid used to
289 * add the route might've moved between gateway peers. In this
290 * case we want to move the route to the new gateway as well. The
291 * intent here is not to confuse the user who added the route.
293 list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
294 lpni = lnet_peer_get_ni_locked(orig_lp, route->lr_nid);
296 lnet_net_lock(LNET_LOCK_EX);
297 list_move(&route->lr_gwlist, &new_lp->lp_routes);
298 lnet_net_unlock(LNET_LOCK_EX);
305 lnet_set_route_aliveness(struct lnet_route *route, bool alive)
307 /* Log when there's a state change */
308 if (route->lr_alive != alive) {
309 CERROR("route to %s through %s has gone from %s to %s\n",
310 libcfs_net2str(route->lr_net),
311 libcfs_nid2str(route->lr_gateway->lp_primary_nid),
312 (route->lr_alive) ? "up" : "down",
313 alive ? "up" : "down");
314 route->lr_alive = alive;
319 lnet_router_discovery_ping_reply(struct lnet_peer *lp)
321 struct lnet_ping_buffer *pbuf = lp->lp_data;
322 struct lnet_remotenet *rnet;
323 struct lnet_peer_net *llpn;
324 struct lnet_route *route;
331 spin_lock(&lp->lp_lock);
332 lp_state = lp->lp_state;
334 /* only handle replies if discovery is disabled. */
335 if (!lnet_is_discovery_disabled_locked(lp)) {
336 spin_unlock(&lp->lp_lock);
340 spin_unlock(&lp->lp_lock);
342 if (lp_state & LNET_PEER_PING_FAILED ||
343 pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
344 CDEBUG(D_NET, "Set routes down for gw %s because %s %d\n",
345 libcfs_nid2str(lp->lp_primary_nid),
346 lp_state & LNET_PEER_PING_FAILED ? "ping failed" :
347 "route feature is disabled", lp->lp_ping_error);
348 /* If the ping failed or the peer has routing disabled then
349 * mark the routes served by this peer down
351 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
352 lnet_set_route_aliveness(route, false);
356 CDEBUG(D_NET, "Discovery is disabled. Processing reply for gw: %s\n",
357 libcfs_nid2str(lp->lp_primary_nid));
360 * examine the ping response:
361 * For each NID in the ping response, extract the net
362 * if the net exists on our remote net list then
363 * iterate over the routes on the rnet and if:
364 * The route's local net is healthy and
365 * The remote net status is UP, then mark the route up
366 * otherwise mark the route down
368 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
369 net = LNET_NIDNET(pbuf->pb_info.pi_ni[i].ns_nid);
370 rnet = lnet_find_rnet_locked(net);
373 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
374 /* check if this is the route's gateway */
375 if (lp->lp_primary_nid !=
376 route->lr_gateway->lp_primary_nid)
379 llpn = lnet_peer_get_net_locked(lp, route->lr_lnet);
381 lnet_set_route_aliveness(route, false);
385 if (!lnet_is_gateway_net_alive(llpn)) {
386 lnet_set_route_aliveness(route, false);
390 if (avoid_asym_router_failure &&
391 pbuf->pb_info.pi_ni[i].ns_status !=
396 * revisit all previous NIDs and check if
397 * any on the network we're examining is
398 * up. If at least one is up then we consider
399 * the route to be alive.
401 for (j = 1; j < i; j++) {
402 net2 = LNET_NIDNET(pbuf->pb_info.
405 pbuf->pb_info.pi_ni[j].ns_status ==
410 lnet_set_route_aliveness(route, false);
415 lnet_set_route_aliveness(route, true);
421 lnet_router_discovery_complete(struct lnet_peer *lp)
423 struct lnet_peer_ni *lpni = NULL;
424 struct lnet_route *route;
426 spin_lock(&lp->lp_lock);
427 lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
428 lp->lp_state |= LNET_PEER_RTR_DISCOVERED;
429 spin_unlock(&lp->lp_lock);
432 * Router discovery successful? All peer information would've been
433 * updated already. No need to do any more processing
435 if (!lp->lp_dc_error)
438 * discovery failed? then we need to set the status of each lpni
439 * to DOWN. It will be updated the next time we discover the
440 * router. For router peer NIs not on local networks, we never send
441 * messages directly to them, so their health will always remain
442 * at maximum. We can only tell if they are up or down from the
443 * status returned in the PING response. If we fail to get that
444 * status in our scheduled router discovery, then we'll assume
445 * it's down until we're told otherwise.
447 CDEBUG(D_NET, "%s: Router discovery failed %d\n",
448 libcfs_nid2str(lp->lp_primary_nid), lp->lp_dc_error);
449 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
450 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
452 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
453 lnet_set_route_aliveness(route, false);
457 lnet_rtr_addref_locked(struct lnet_peer *lp)
459 LASSERT(lp->lp_rtr_refcount >= 0);
461 /* lnet_net_lock must be exclusively locked */
462 lp->lp_rtr_refcount++;
463 if (lp->lp_rtr_refcount == 1) {
464 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
465 /* addref for the_lnet.ln_routers */
466 lnet_peer_addref_locked(lp);
467 the_lnet.ln_routers_version++;
472 lnet_rtr_decref_locked(struct lnet_peer *lp)
474 LASSERT(atomic_read(&lp->lp_refcount) > 0);
475 LASSERT(lp->lp_rtr_refcount > 0);
477 /* lnet_net_lock must be exclusively locked */
478 lp->lp_rtr_refcount--;
479 if (lp->lp_rtr_refcount == 0) {
480 LASSERT(list_empty(&lp->lp_routes));
482 list_del(&lp->lp_rtr_list);
483 /* decref for the_lnet.ln_routers */
484 lnet_peer_decref_locked(lp);
485 the_lnet.ln_routers_version++;
489 struct lnet_remotenet *
490 lnet_find_rnet_locked(__u32 net)
492 struct lnet_remotenet *rnet;
493 struct list_head *tmp;
494 struct list_head *rn_list;
496 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
498 rn_list = lnet_net2rnethash(net);
499 list_for_each(tmp, rn_list) {
500 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
502 if (rnet->lrn_net == net)
508 static void lnet_shuffle_seed(void)
511 struct lnet_ni *ni = NULL;
516 /* Nodes with small feet have little entropy
517 * the NID for this node gives the most entropy in the low bits */
518 while ((ni = lnet_get_next_ni_locked(NULL, ni)))
519 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
524 /* NB expects LNET_LOCK held */
526 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
528 struct lnet_peer_net *lpn;
529 unsigned int offset = 0;
530 unsigned int len = 0;
535 list_for_each(e, &rnet->lrn_routes)
539 * Randomly adding routes to the list is done to ensure that when
540 * different nodes are using the same list of routers, they end up
541 * preferring different routers.
543 offset = prandom_u32_max(len + 1);
544 list_for_each(e, &rnet->lrn_routes) {
549 list_add(&route->lr_list, e);
551 * force a router check on the gateway to make sure the route is
554 list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
556 lpn->lpn_rtrcheck_timestamp = 0;
559 the_lnet.ln_remote_nets_version++;
561 /* add the route on the gateway list */
562 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
564 /* take a router reference count on the gateway */
565 lnet_rtr_addref_locked(route->lr_gateway);
569 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
570 __u32 priority, __u32 sensitivity)
572 struct list_head *route_entry;
573 struct lnet_remotenet *rnet;
574 struct lnet_remotenet *rnet2;
575 struct lnet_route *route;
576 struct lnet_peer_ni *lpni;
577 struct lnet_peer *gw;
581 CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
582 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
584 if (gateway == LNET_NID_ANY ||
585 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
586 net == LNET_NIDNET(LNET_NID_ANY) ||
587 LNET_NETTYP(net) == LOLND ||
588 LNET_NIDNET(gateway) == net ||
589 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
592 /* it's a local network */
593 if (lnet_islocalnet(net))
596 if (!lnet_islocalnet(LNET_NIDNET(gateway))) {
597 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
598 libcfs_nid2str(gateway),
599 libcfs_net2str(LNET_NIDNET(gateway)));
600 return -EHOSTUNREACH;
603 /* Assume net, route, all new */
604 LIBCFS_ALLOC(route, sizeof(*route));
605 LIBCFS_ALLOC(rnet, sizeof(*rnet));
606 if (route == NULL || rnet == NULL) {
607 CERROR("Out of memory creating route %s %d %s\n",
608 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
610 LIBCFS_FREE(route, sizeof(*route));
612 LIBCFS_FREE(rnet, sizeof(*rnet));
616 INIT_LIST_HEAD(&rnet->lrn_routes);
618 /* store the local and remote net that the route represents */
619 route->lr_lnet = LNET_NIDNET(gateway);
621 route->lr_nid = gateway;
622 route->lr_priority = priority;
623 route->lr_hops = hops;
625 lnet_net_lock(LNET_LOCK_EX);
628 * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
629 * lose that once we're done
631 lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
633 lnet_net_unlock(LNET_LOCK_EX);
635 LIBCFS_FREE(route, sizeof(*route));
636 LIBCFS_FREE(rnet, sizeof(*rnet));
639 CERROR("Error %d creating route %s %d %s\n", rc,
640 libcfs_net2str(net), hops,
641 libcfs_nid2str(gateway));
645 LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
646 gw = lpni->lpni_peer_net->lpn_peer;
648 route->lr_gateway = gw;
650 rnet2 = lnet_find_rnet_locked(net);
653 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
657 /* Search for a duplicate route (it's a NOOP if it is) */
659 list_for_each(route_entry, &rnet2->lrn_routes) {
660 struct lnet_route *route2;
662 route2 = list_entry(route_entry, struct lnet_route, lr_list);
663 if (route2->lr_gateway == route->lr_gateway) {
668 /* our lookups must be true */
669 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
673 * It is possible to add multiple routes through the same peer,
674 * but it'll be using a different NID of that peer. When the
675 * gateway is discovered, discovery will consolidate the different
676 * peers into one peer. In this case the discovery code will have
677 * to move the routes from the peer that's being deleted to the
678 * consolidated peer lp_routes list
681 gw->lp_health_sensitivity = sensitivity;
682 lnet_add_route_to_rnet(rnet2, route);
683 if (lnet_peer_discovery_disabled)
684 CWARN("Consider turning discovery on to enable full "
685 "Multi-Rail routing functionality\n");
689 * get rid of the reference on the lpni.
691 lnet_peer_ni_decref_locked(lpni);
692 lnet_net_unlock(LNET_LOCK_EX);
698 LIBCFS_FREE(route, sizeof(*route));
702 LIBCFS_FREE(rnet, sizeof(*rnet));
704 /* kick start the monitor thread to handle the added route */
705 complete(&the_lnet.ln_mt_wait_complete);
711 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
712 struct list_head *zombies)
714 struct lnet_peer *gateway;
715 struct lnet_route *route;
716 struct lnet_route *tmp;
718 list_for_each_entry_safe(route, tmp, route_list, lr_list) {
719 gateway = route->lr_gateway;
720 if (gw_nid != LNET_NID_ANY &&
721 gw_nid != gateway->lp_primary_nid)
725 * move to zombie to delete outside the lock
726 * Note that this function is called with the
727 * ln_api_mutex held as well as the exclusive net
728 * lock. Adding to the remote net list happens
729 * under the same conditions. Same goes for the
730 * gateway router list
732 list_move(&route->lr_list, zombies);
733 the_lnet.ln_remote_nets_version++;
735 list_del(&route->lr_gwlist);
736 lnet_rtr_decref_locked(gateway);
741 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
743 struct list_head rnet_zombies;
744 struct lnet_remotenet *rnet;
745 struct lnet_remotenet *tmp;
746 struct list_head *rn_list;
747 struct lnet_peer_ni *lpni;
748 struct lnet_route *route;
749 struct list_head zombies;
750 struct lnet_peer *lp = NULL;
753 INIT_LIST_HEAD(&rnet_zombies);
754 INIT_LIST_HEAD(&zombies);
756 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
757 libcfs_net2str(net), libcfs_nid2str(gw_nid));
759 /* NB Caller may specify either all routes via the given gateway
760 * or a specific route entry actual NIDs) */
762 lnet_net_lock(LNET_LOCK_EX);
764 lpni = lnet_find_peer_ni_locked(gw_nid);
766 lp = lpni->lpni_peer_net->lpn_peer;
768 gw_nid = lp->lp_primary_nid;
769 lnet_peer_ni_decref_locked(lpni);
772 if (net != LNET_NIDNET(LNET_NID_ANY)) {
773 rnet = lnet_find_rnet_locked(net);
775 lnet_net_unlock(LNET_LOCK_EX);
778 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
780 if (list_empty(&rnet->lrn_routes))
781 list_move(&rnet->lrn_list, &rnet_zombies);
785 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
786 rn_list = &the_lnet.ln_remote_nets_hash[i];
788 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
789 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
791 if (list_empty(&rnet->lrn_routes))
792 list_move(&rnet->lrn_list, &rnet_zombies);
798 * check if there are any routes remaining on the gateway
799 * If there are no more routes make sure to set the peer's
800 * lp_disc_net_id to 0 (invalid), in case we add more routes in
801 * the future on that gateway, then we start our discovery process
805 if (list_empty(&lp->lp_routes))
806 lp->lp_disc_net_id = 0;
809 lnet_net_unlock(LNET_LOCK_EX);
811 while (!list_empty(&zombies)) {
812 route = list_first_entry(&zombies, struct lnet_route, lr_list);
813 list_del(&route->lr_list);
814 LIBCFS_FREE(route, sizeof(*route));
817 while (!list_empty(&rnet_zombies)) {
818 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
820 list_del(&rnet->lrn_list);
821 LIBCFS_FREE(rnet, sizeof(*rnet));
828 lnet_destroy_routes (void)
830 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
833 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
835 struct lnet_rtrbufpool *rbp;
836 int i, rc = -ENOENT, j;
838 if (the_lnet.ln_rtrpools == NULL)
842 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
847 for (j = 0; j < LNET_NRBPOOLS; j++) {
848 pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
849 pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
850 pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
851 pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
858 lnet_net_lock(LNET_LOCK_EX);
859 pool_cfg->pl_routing = the_lnet.ln_routing;
860 lnet_net_unlock(LNET_LOCK_EX);
866 lnet_get_route(int idx, __u32 *net, __u32 *hops,
867 lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
869 struct lnet_remotenet *rnet;
870 struct list_head *rn_list;
871 struct lnet_route *route;
872 struct list_head *e1;
873 struct list_head *e2;
877 cpt = lnet_net_lock_current();
879 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
880 rn_list = &the_lnet.ln_remote_nets_hash[i];
881 list_for_each(e1, rn_list) {
882 rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
884 list_for_each(e2, &rnet->lrn_routes) {
885 route = list_entry(e2, struct lnet_route,
889 *net = rnet->lrn_net;
890 *gateway = route->lr_nid;
891 *hops = route->lr_hops;
892 *priority = route->lr_priority;
893 *sensitivity = route->lr_gateway->
894 lp_health_sensitivity;
895 *alive = lnet_is_route_alive(route);
896 lnet_net_unlock(cpt);
903 lnet_net_unlock(cpt);
908 lnet_wait_known_routerstate(void)
910 struct lnet_peer *rtr;
911 struct list_head *entry;
914 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
917 int cpt = lnet_net_lock_current();
920 list_for_each(entry, &the_lnet.ln_routers) {
921 rtr = list_entry(entry, struct lnet_peer,
924 spin_lock(&rtr->lp_lock);
926 if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
928 spin_unlock(&rtr->lp_lock);
931 spin_unlock(&rtr->lp_lock);
934 lnet_net_unlock(cpt);
939 set_current_state(TASK_UNINTERRUPTIBLE);
940 schedule_timeout(cfs_time_seconds(1));
945 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
950 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
953 ni->ni_status->ns_status != status) {
954 ni->ni_status->ns_status = status;
964 lnet_update_ni_status_locked(void)
966 struct lnet_net *net;
971 LASSERT(the_lnet.ln_routing);
973 timeout = router_ping_timeout + alive_router_check_interval;
975 now = ktime_get_real_seconds();
976 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
977 if (net->net_lnd->lnd_type == LOLND)
980 if (now < net->net_last_alive + timeout)
983 spin_lock(&net->net_lock);
984 /* re-check with lock */
985 if (now < net->net_last_alive + timeout) {
986 spin_unlock(&net->net_lock);
989 spin_unlock(&net->net_lock);
992 * if the net didn't receive any traffic for past the
993 * timeout on any of its constituent NIs, then mark all
996 push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN);
1002 void lnet_wait_router_start(void)
1004 if (check_routers_before_use) {
1005 /* Note that a helpful side-effect of pinging all known routers
1006 * at startup is that it makes them drop stale connections they
1007 * may have to a previous instance of me. */
1008 lnet_wait_known_routerstate();
1013 * This function is called from the monitor thread to check if there are
1014 * any active routers that need to be checked.
1017 lnet_router_checker_active(void)
1019 /* Router Checker thread needs to run when routing is enabled in
1020 * order to call lnet_update_ni_status_locked() */
1021 if (the_lnet.ln_routing)
1024 return !list_empty(&the_lnet.ln_routers) &&
1025 alive_router_check_interval > 0;
1029 lnet_check_routers(void)
1031 struct lnet_peer_net *first_lpn = NULL;
1032 struct lnet_peer_net *lpn;
1033 struct lnet_peer_ni *lpni;
1034 struct list_head *entry;
1035 struct lnet_peer *rtr;
1044 cpt = lnet_net_lock_current();
1046 version = the_lnet.ln_routers_version;
1048 list_for_each(entry, &the_lnet.ln_routers) {
1049 rtr = list_entry(entry, struct lnet_peer,
1052 now = ktime_get_real_seconds();
1055 * only discover the router if we've passed
1056 * alive_router_check_interval seconds. Some of the router
1057 * interfaces could be down and in that case they would be
1058 * undergoing recovery separately from this discovery.
1060 /* find next peer net which is also local */
1061 net_id = rtr->lp_disc_net_id;
1063 lpn = lnet_get_next_peer_net_locked(rtr, net_id);
1065 CERROR("gateway %s has no networks\n",
1066 libcfs_nid2str(rtr->lp_primary_nid));
1069 if (first_lpn == lpn)
1073 found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id);
1074 net_id = lpn->lpn_net_id;
1075 } while (!found_lpn);
1077 if (!found_lpn || !lpn) {
1078 CERROR("no local network found for gateway %s\n",
1079 libcfs_nid2str(rtr->lp_primary_nid));
1083 if (now - lpn->lpn_rtrcheck_timestamp <
1084 alive_router_check_interval / lnet_current_net_count)
1088 * If we're currently discovering the peer then don't
1089 * issue another discovery
1091 spin_lock(&rtr->lp_lock);
1092 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) {
1093 spin_unlock(&rtr->lp_lock);
1096 /* make sure we actively discover the router */
1097 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1098 rtr->lp_state |= LNET_PEER_RTR_DISCOVERY;
1099 spin_unlock(&rtr->lp_lock);
1101 /* find the peer_ni associated with the primary NID */
1102 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
1104 CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
1105 libcfs_nid2str(rtr->lp_primary_nid));
1108 lnet_peer_ni_addref_locked(lpni);
1110 /* specify the net to use */
1111 rtr->lp_disc_net_id = lpn->lpn_net_id;
1113 /* discover the router */
1114 CDEBUG(D_NET, "discover %s, cpt = %d\n",
1115 libcfs_nid2str(lpni->lpni_nid), cpt);
1116 rc = lnet_discover_peer_locked(lpni, cpt, false);
1118 /* decrement ref count acquired by find_peer_ni_locked() */
1119 lnet_peer_ni_decref_locked(lpni);
1122 lpn->lpn_rtrcheck_timestamp = now;
1124 CERROR("Failed to discover router %s\n",
1125 libcfs_nid2str(rtr->lp_primary_nid));
1127 /* NB dropped lock */
1128 if (version != the_lnet.ln_routers_version) {
1129 /* the routers list has changed */
1134 if (the_lnet.ln_routing)
1135 push = lnet_update_ni_status_locked();
1137 lnet_net_unlock(cpt);
1139 /* if the status of the ni changed update the peers */
1141 lnet_push_update_to_peers(1);
1145 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1147 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1149 while (--npages >= 0)
1150 __free_page(rb->rb_kiov[npages].kiov_page);
1152 LIBCFS_FREE(rb, sz);
1155 static struct lnet_rtrbuf *
1156 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1158 int npages = rbp->rbp_npages;
1159 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1161 struct lnet_rtrbuf *rb;
1164 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1170 for (i = 0; i < npages; i++) {
1171 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1172 GFP_KERNEL | __GFP_ZERO);
1175 __free_page(rb->rb_kiov[i].kiov_page);
1177 LIBCFS_FREE(rb, sz);
1181 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
1182 rb->rb_kiov[i].kiov_offset = 0;
1183 rb->rb_kiov[i].kiov_page = page;
1190 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1192 int npages = rbp->rbp_npages;
1193 struct lnet_rtrbuf *rb;
1194 struct list_head tmp;
1196 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1199 INIT_LIST_HEAD(&tmp);
1202 list_splice_init(&rbp->rbp_msgs, &tmp);
1203 lnet_drop_routed_msgs_locked(&tmp, cpt);
1204 list_splice_init(&rbp->rbp_bufs, &tmp);
1205 rbp->rbp_req_nbuffers = 0;
1206 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1207 rbp->rbp_mincredits = 0;
1208 lnet_net_unlock(cpt);
1210 /* Free buffers on the free list. */
1211 while (!list_empty(&tmp)) {
1212 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1213 list_del(&rb->rb_list);
1214 lnet_destroy_rtrbuf(rb, npages);
1219 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1221 struct list_head rb_list;
1222 struct lnet_rtrbuf *rb;
1224 int num_buffers = 0;
1226 int npages = rbp->rbp_npages;
1229 /* If we are called for less buffers than already in the pool, we
1230 * just lower the req_nbuffers number and excess buffers will be
1231 * thrown away as they are returned to the free list. Credits
1232 * then get adjusted as well.
1233 * If we already have enough buffers allocated to serve the
1234 * increase requested, then we can treat that the same way as we
1235 * do the decrease. */
1236 num_rb = nbufs - rbp->rbp_nbuffers;
1237 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1238 rbp->rbp_req_nbuffers = nbufs;
1239 lnet_net_unlock(cpt);
1242 /* store the older value of rbp_req_nbuffers and then set it to
1243 * the new request to prevent lnet_return_rx_credits_locked() from
1244 * freeing buffers that we need to keep around */
1245 old_req_nbufs = rbp->rbp_req_nbuffers;
1246 rbp->rbp_req_nbuffers = nbufs;
1247 lnet_net_unlock(cpt);
1249 INIT_LIST_HEAD(&rb_list);
1251 /* allocate the buffers on a local list first. If all buffers are
1252 * allocated successfully then join this list to the rbp buffer
1253 * list. If not then free all allocated buffers. */
1254 while (num_rb-- > 0) {
1255 rb = lnet_new_rtrbuf(rbp, cpt);
1257 CERROR("Failed to allocate %d route bufs of %d pages\n",
1261 rbp->rbp_req_nbuffers = old_req_nbufs;
1262 lnet_net_unlock(cpt);
1267 list_add(&rb->rb_list, &rb_list);
1273 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1274 rbp->rbp_nbuffers += num_buffers;
1275 rbp->rbp_credits += num_buffers;
1276 rbp->rbp_mincredits = rbp->rbp_credits;
1277 /* We need to schedule blocked msg using the newly
1279 while (!list_empty(&rbp->rbp_bufs) &&
1280 !list_empty(&rbp->rbp_msgs))
1281 lnet_schedule_blocked_locked(rbp);
1283 lnet_net_unlock(cpt);
1288 while (!list_empty(&rb_list)) {
1289 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1290 list_del(&rb->rb_list);
1291 lnet_destroy_rtrbuf(rb, npages);
1298 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1300 INIT_LIST_HEAD(&rbp->rbp_msgs);
1301 INIT_LIST_HEAD(&rbp->rbp_bufs);
1303 rbp->rbp_npages = npages;
1304 rbp->rbp_credits = 0;
1305 rbp->rbp_mincredits = 0;
1309 lnet_rtrpools_free(int keep_pools)
1311 struct lnet_rtrbufpool *rtrp;
1314 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1317 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1318 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1319 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1320 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1324 cfs_percpt_free(the_lnet.ln_rtrpools);
1325 the_lnet.ln_rtrpools = NULL;
1330 lnet_nrb_tiny_calculate(void)
1332 int nrbs = LNET_NRB_TINY;
1334 if (tiny_router_buffers < 0) {
1335 LCONSOLE_ERROR_MSG(0x10c,
1336 "tiny_router_buffers=%d invalid when "
1337 "routing enabled\n", tiny_router_buffers);
1341 if (tiny_router_buffers > 0)
1342 nrbs = tiny_router_buffers;
1344 nrbs /= LNET_CPT_NUMBER;
1345 return max(nrbs, LNET_NRB_TINY_MIN);
1349 lnet_nrb_small_calculate(void)
1351 int nrbs = LNET_NRB_SMALL;
1353 if (small_router_buffers < 0) {
1354 LCONSOLE_ERROR_MSG(0x10c,
1355 "small_router_buffers=%d invalid when "
1356 "routing enabled\n", small_router_buffers);
1360 if (small_router_buffers > 0)
1361 nrbs = small_router_buffers;
1363 nrbs /= LNET_CPT_NUMBER;
1364 return max(nrbs, LNET_NRB_SMALL_MIN);
1368 lnet_nrb_large_calculate(void)
1370 int nrbs = LNET_NRB_LARGE;
1372 if (large_router_buffers < 0) {
1373 LCONSOLE_ERROR_MSG(0x10c,
1374 "large_router_buffers=%d invalid when "
1375 "routing enabled\n", large_router_buffers);
1379 if (large_router_buffers > 0)
1380 nrbs = large_router_buffers;
1382 nrbs /= LNET_CPT_NUMBER;
1383 return max(nrbs, LNET_NRB_LARGE_MIN);
1387 lnet_rtrpools_alloc(int im_a_router)
1389 struct lnet_rtrbufpool *rtrp;
1396 if (!strcmp(forwarding, "")) {
1397 /* not set either way */
1400 } else if (!strcmp(forwarding, "disabled")) {
1401 /* explicitly disabled */
1403 } else if (!strcmp(forwarding, "enabled")) {
1404 /* explicitly enabled */
1406 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1407 "'enabled' or 'disabled'\n");
1411 nrb_tiny = lnet_nrb_tiny_calculate();
1415 nrb_small = lnet_nrb_small_calculate();
1419 nrb_large = lnet_nrb_large_calculate();
1423 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1425 sizeof(struct lnet_rtrbufpool));
1426 if (the_lnet.ln_rtrpools == NULL) {
1427 LCONSOLE_ERROR_MSG(0x10c,
1428 "Failed to initialize router buffe pool\n");
1432 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1433 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1434 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1439 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1440 LNET_NRB_SMALL_PAGES);
1441 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1446 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1447 LNET_NRB_LARGE_PAGES);
1448 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1454 lnet_net_lock(LNET_LOCK_EX);
1455 the_lnet.ln_routing = 1;
1456 lnet_net_unlock(LNET_LOCK_EX);
1457 complete(&the_lnet.ln_mt_wait_complete);
1461 lnet_rtrpools_free(0);
1466 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1471 struct lnet_rtrbufpool *rtrp;
1473 /* If the provided values for each buffer pool are different than the
1474 * configured values, we need to take action. */
1476 tiny_router_buffers = tiny;
1477 nrb = lnet_nrb_tiny_calculate();
1478 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1479 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1486 small_router_buffers = small;
1487 nrb = lnet_nrb_small_calculate();
1488 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1489 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1496 large_router_buffers = large;
1497 nrb = lnet_nrb_large_calculate();
1498 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1499 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1510 lnet_rtrpools_adjust(int tiny, int small, int large)
1512 /* this function doesn't revert the changes if adding new buffers
1513 * failed. It's up to the user space caller to revert the
1516 if (!the_lnet.ln_routing)
1519 return lnet_rtrpools_adjust_helper(tiny, small, large);
1523 lnet_rtrpools_enable(void)
1527 if (the_lnet.ln_routing)
1530 if (the_lnet.ln_rtrpools == NULL)
1531 /* If routing is turned off, and we have never
1532 * initialized the pools before, just call the
1533 * standard buffer pool allocation routine as
1534 * if we are just configuring this for the first
1536 rc = lnet_rtrpools_alloc(1);
1538 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1542 lnet_net_lock(LNET_LOCK_EX);
1543 the_lnet.ln_routing = 1;
1545 the_lnet.ln_ping_target->pb_info.pi_features &=
1546 ~LNET_PING_FEAT_RTE_DISABLED;
1547 lnet_net_unlock(LNET_LOCK_EX);
1549 if (lnet_peer_discovery_disabled)
1550 CWARN("Consider turning discovery on to enable full "
1551 "Multi-Rail routing functionality\n");
1557 lnet_rtrpools_disable(void)
1559 if (!the_lnet.ln_routing)
1562 lnet_net_lock(LNET_LOCK_EX);
1563 the_lnet.ln_routing = 0;
1564 the_lnet.ln_ping_target->pb_info.pi_features |=
1565 LNET_PING_FEAT_RTE_DISABLED;
1567 tiny_router_buffers = 0;
1568 small_router_buffers = 0;
1569 large_router_buffers = 0;
1570 lnet_net_unlock(LNET_LOCK_EX);
1571 lnet_rtrpools_free(1);
1575 lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid)
1577 if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1578 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1582 * ni: local NI used to communicate with the peer
1584 * alive: true if peer is alive, false otherwise
1585 * reset: reset health value. This is requested by the LND.
1586 * when: notificaiton time.
1589 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
1592 struct lnet_peer_ni *lpni = NULL;
1593 struct lnet_route *route;
1594 struct lnet_peer *lp;
1595 time64_t now = ktime_get_seconds();
1598 LASSERT (!in_interrupt ());
1600 CDEBUG (D_NET, "%s notifying %s: %s\n",
1601 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1602 libcfs_nid2str(nid),
1603 alive ? "up" : "down");
1606 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1607 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1608 libcfs_nid2str(nid), alive ? "birth" : "death",
1609 libcfs_nid2str(ni->ni_nid));
1613 /* can't do predictions... */
1615 CWARN("Ignoring prediction from %s of %s %s "
1616 "%lld seconds in the future\n",
1617 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1618 libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1622 if (ni != NULL && !alive && /* LND telling me she's down */
1623 !auto_down) { /* auto-down disabled */
1624 CDEBUG(D_NET, "Auto-down disabled\n");
1628 /* must lock 0 since this is used for synchronization */
1631 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1636 lpni = lnet_find_peer_ni_locked(nid);
1640 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1646 lnet_set_healthv(&lpni->lpni_healthv,
1647 LNET_MAX_HEALTH_VALUE);
1649 lnet_inc_healthv(&lpni->lpni_healthv);
1651 lnet_handle_remote_failure_locked(lpni);
1654 /* recalculate aliveness */
1655 alive = lnet_is_peer_ni_alive(lpni);
1658 if (ni != NULL && !alive)
1659 lnet_notify_peer_down(ni, lpni->lpni_nid);
1661 cpt = lpni->lpni_cpt;
1663 lnet_peer_ni_decref_locked(lpni);
1664 if (lpni && lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer) {
1665 lp = lpni->lpni_peer_net->lpn_peer;
1666 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
1667 lnet_set_route_aliveness(route, alive);
1669 lnet_net_unlock(cpt);
1673 EXPORT_SYMBOL(lnet_notify);