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 * The peer_net of a gateway is alive if at least one of the peer_ni's on
189 * that peer_net is alive.
192 lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
194 struct lnet_peer_ni *lpni;
196 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
197 if (lnet_is_peer_ni_alive(lpni))
205 * a gateway is alive only if all its nets are alive
206 * called with cpt lock held
208 bool lnet_is_gateway_alive(struct lnet_peer *gw)
210 struct lnet_peer_net *lpn;
215 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
216 if (!lnet_is_gateway_net_alive(lpn))
224 * lnet_is_route_alive() needs to be called with cpt lock held
225 * A route is alive if the gateway can route between the local network and
226 * the remote network of the route.
227 * This means at least one NI is alive on each of the local and remote
228 * networks of the gateway.
230 bool lnet_is_route_alive(struct lnet_route *route)
232 struct lnet_peer *gw = route->lr_gateway;
233 struct lnet_peer_net *llpn;
234 struct lnet_peer_net *rlpn;
236 /* If the gateway is down then all routes are considered down */
241 * if discovery is disabled then rely on the cached aliveness
242 * information. This is handicapped information which we log when
243 * we receive the discovery ping response. The most uptodate
244 * aliveness information can only be obtained when discovery is
247 if (lnet_is_discovery_disabled(gw))
248 return route->lr_alive;
251 * check the gateway's interfaces on the local network
253 llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
257 if (!lnet_is_gateway_net_alive(llpn))
260 if (avoid_asym_router_failure) {
261 /* Check the gateway's interfaces on the remote network */
262 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
265 if (!lnet_is_gateway_net_alive(rlpn))
269 spin_lock(&gw->lp_lock);
270 if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
271 spin_unlock(&gw->lp_lock);
272 if (gw->lp_rtr_refcount > 0)
273 CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
274 libcfs_nid2str(gw->lp_primary_nid));
277 spin_unlock(&gw->lp_lock);
283 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
284 struct lnet_peer *new_lp)
286 struct lnet_peer_ni *lpni;
287 struct lnet_route *route;
290 * Although a route is correlated with a peer, but when it's added
291 * a specific NID is used. That NID refers to a peer_ni within
292 * a peer. There could be other peer_nis on the same net, which
293 * can be used to send to that gateway. However when we are
294 * consolidating gateways because of discovery, the nid used to
295 * add the route might've moved between gateway peers. In this
296 * case we want to move the route to the new gateway as well. The
297 * intent here is not to confuse the user who added the route.
299 list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
300 lpni = lnet_peer_get_ni_locked(orig_lp, route->lr_nid);
302 lnet_net_lock(LNET_LOCK_EX);
303 list_move(&route->lr_gwlist, &new_lp->lp_routes);
304 lnet_net_unlock(LNET_LOCK_EX);
311 lnet_set_route_aliveness(struct lnet_route *route, bool alive)
313 /* Log when there's a state change */
314 if (route->lr_alive != alive) {
315 CERROR("route to %s through %s has gone from %s to %s\n",
316 libcfs_net2str(route->lr_net),
317 libcfs_nid2str(route->lr_gateway->lp_primary_nid),
318 (route->lr_alive) ? "up" : "down",
319 alive ? "up" : "down");
320 route->lr_alive = alive;
325 lnet_router_discovery_ping_reply(struct lnet_peer *lp)
327 struct lnet_ping_buffer *pbuf = lp->lp_data;
328 struct lnet_remotenet *rnet;
329 struct lnet_peer_net *llpn;
330 struct lnet_route *route;
337 spin_lock(&lp->lp_lock);
338 lp_state = lp->lp_state;
340 /* only handle replies if discovery is disabled. */
341 if (!lnet_is_discovery_disabled_locked(lp)) {
342 spin_unlock(&lp->lp_lock);
346 spin_unlock(&lp->lp_lock);
348 if (lp_state & LNET_PEER_PING_FAILED ||
349 pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
350 CDEBUG(D_NET, "Set routes down for gw %s because %s %d\n",
351 libcfs_nid2str(lp->lp_primary_nid),
352 lp_state & LNET_PEER_PING_FAILED ? "ping failed" :
353 "route feature is disabled", lp->lp_ping_error);
354 /* If the ping failed or the peer has routing disabled then
355 * mark the routes served by this peer down
357 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
358 lnet_set_route_aliveness(route, false);
362 CDEBUG(D_NET, "Discovery is disabled. Processing reply for gw: %s\n",
363 libcfs_nid2str(lp->lp_primary_nid));
366 * examine the ping response:
367 * For each NID in the ping response, extract the net
368 * if the net exists on our remote net list then
369 * iterate over the routes on the rnet and if:
370 * The route's local net is healthy and
371 * The remote net status is UP, then mark the route up
372 * otherwise mark the route down
374 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
375 net = LNET_NIDNET(pbuf->pb_info.pi_ni[i].ns_nid);
376 rnet = lnet_find_rnet_locked(net);
379 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
380 /* check if this is the route's gateway */
381 if (lp->lp_primary_nid !=
382 route->lr_gateway->lp_primary_nid)
385 llpn = lnet_peer_get_net_locked(lp, route->lr_lnet);
387 lnet_set_route_aliveness(route, false);
391 if (!lnet_is_gateway_net_alive(llpn)) {
392 lnet_set_route_aliveness(route, false);
396 if (avoid_asym_router_failure &&
397 pbuf->pb_info.pi_ni[i].ns_status !=
402 * revisit all previous NIDs and check if
403 * any on the network we're examining is
404 * up. If at least one is up then we consider
405 * the route to be alive.
407 for (j = 1; j < i; j++) {
408 net2 = LNET_NIDNET(pbuf->pb_info.
411 pbuf->pb_info.pi_ni[j].ns_status ==
416 lnet_set_route_aliveness(route, false);
421 lnet_set_route_aliveness(route, true);
427 lnet_router_discovery_complete(struct lnet_peer *lp)
429 struct lnet_peer_ni *lpni = NULL;
430 struct lnet_route *route;
432 spin_lock(&lp->lp_lock);
433 lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
434 lp->lp_state |= LNET_PEER_RTR_DISCOVERED;
435 lp->lp_alive = lp->lp_dc_error == 0;
436 spin_unlock(&lp->lp_lock);
439 * Router discovery successful? All peer information would've been
440 * updated already. No need to do any more processing
446 * We do not send messages directly to the remote interfaces
447 * of an LNet router. As such, we rely on the PING response
448 * to determine the up/down status of these interfaces. If
449 * a PING response is not receieved, or some other problem with
450 * discovery occurs that prevents us from getting this status,
451 * we assume all interfaces are down until we're able to
452 * determine otherwise.
454 CDEBUG(D_NET, "%s: Router discovery failed %d\n",
455 libcfs_nid2str(lp->lp_primary_nid), lp->lp_dc_error);
456 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
457 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
459 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
460 lnet_set_route_aliveness(route, false);
464 lnet_rtr_addref_locked(struct lnet_peer *lp)
466 LASSERT(lp->lp_rtr_refcount >= 0);
468 /* lnet_net_lock must be exclusively locked */
469 lp->lp_rtr_refcount++;
470 if (lp->lp_rtr_refcount == 1) {
471 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
472 /* addref for the_lnet.ln_routers */
473 lnet_peer_addref_locked(lp);
474 the_lnet.ln_routers_version++;
479 lnet_rtr_decref_locked(struct lnet_peer *lp)
481 LASSERT(atomic_read(&lp->lp_refcount) > 0);
482 LASSERT(lp->lp_rtr_refcount > 0);
484 /* lnet_net_lock must be exclusively locked */
485 lp->lp_rtr_refcount--;
486 if (lp->lp_rtr_refcount == 0) {
487 LASSERT(list_empty(&lp->lp_routes));
489 list_del(&lp->lp_rtr_list);
490 /* decref for the_lnet.ln_routers */
491 lnet_peer_decref_locked(lp);
492 the_lnet.ln_routers_version++;
496 struct lnet_remotenet *
497 lnet_find_rnet_locked(__u32 net)
499 struct lnet_remotenet *rnet;
500 struct list_head *tmp;
501 struct list_head *rn_list;
503 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
505 rn_list = lnet_net2rnethash(net);
506 list_for_each(tmp, rn_list) {
507 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
509 if (rnet->lrn_net == net)
515 static void lnet_shuffle_seed(void)
518 struct lnet_ni *ni = NULL;
523 /* Nodes with small feet have little entropy
524 * the NID for this node gives the most entropy in the low bits */
525 while ((ni = lnet_get_next_ni_locked(NULL, ni)))
526 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
531 /* NB expects LNET_LOCK held */
533 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
535 struct lnet_peer_net *lpn;
536 unsigned int offset = 0;
537 unsigned int len = 0;
542 list_for_each(e, &rnet->lrn_routes)
546 * Randomly adding routes to the list is done to ensure that when
547 * different nodes are using the same list of routers, they end up
548 * preferring different routers.
550 offset = prandom_u32_max(len + 1);
551 list_for_each(e, &rnet->lrn_routes) {
556 list_add(&route->lr_list, e);
558 * force a router check on the gateway to make sure the route is
561 list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
563 lpn->lpn_rtrcheck_timestamp = 0;
566 the_lnet.ln_remote_nets_version++;
568 /* add the route on the gateway list */
569 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
571 /* take a router reference count on the gateway */
572 lnet_rtr_addref_locked(route->lr_gateway);
576 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
577 __u32 priority, __u32 sensitivity)
579 struct list_head *route_entry;
580 struct lnet_remotenet *rnet;
581 struct lnet_remotenet *rnet2;
582 struct lnet_route *route;
583 struct lnet_peer_ni *lpni;
584 struct lnet_peer *gw;
588 CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
589 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
591 if (gateway == LNET_NID_ANY ||
592 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
593 net == LNET_NIDNET(LNET_NID_ANY) ||
594 LNET_NETTYP(net) == LOLND ||
595 LNET_NIDNET(gateway) == net ||
596 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
599 /* it's a local network */
600 if (lnet_islocalnet(net))
603 if (!lnet_islocalnet(LNET_NIDNET(gateway))) {
604 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
605 libcfs_nid2str(gateway),
606 libcfs_net2str(LNET_NIDNET(gateway)));
607 return -EHOSTUNREACH;
610 /* Assume net, route, all new */
611 LIBCFS_ALLOC(route, sizeof(*route));
612 LIBCFS_ALLOC(rnet, sizeof(*rnet));
613 if (route == NULL || rnet == NULL) {
614 CERROR("Out of memory creating route %s %d %s\n",
615 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
617 LIBCFS_FREE(route, sizeof(*route));
619 LIBCFS_FREE(rnet, sizeof(*rnet));
623 INIT_LIST_HEAD(&rnet->lrn_routes);
625 /* store the local and remote net that the route represents */
626 route->lr_lnet = LNET_NIDNET(gateway);
628 route->lr_nid = gateway;
629 route->lr_priority = priority;
630 route->lr_hops = hops;
632 lnet_net_lock(LNET_LOCK_EX);
635 * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
636 * lose that once we're done
638 lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
640 lnet_net_unlock(LNET_LOCK_EX);
642 LIBCFS_FREE(route, sizeof(*route));
643 LIBCFS_FREE(rnet, sizeof(*rnet));
646 CERROR("Error %d creating route %s %d %s\n", rc,
647 libcfs_net2str(net), hops,
648 libcfs_nid2str(gateway));
652 LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
653 gw = lpni->lpni_peer_net->lpn_peer;
655 route->lr_gateway = gw;
657 rnet2 = lnet_find_rnet_locked(net);
660 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
664 /* Search for a duplicate route (it's a NOOP if it is) */
666 list_for_each(route_entry, &rnet2->lrn_routes) {
667 struct lnet_route *route2;
669 route2 = list_entry(route_entry, struct lnet_route, lr_list);
670 if (route2->lr_gateway == route->lr_gateway) {
675 /* our lookups must be true */
676 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
680 * It is possible to add multiple routes through the same peer,
681 * but it'll be using a different NID of that peer. When the
682 * gateway is discovered, discovery will consolidate the different
683 * peers into one peer. In this case the discovery code will have
684 * to move the routes from the peer that's being deleted to the
685 * consolidated peer lp_routes list
688 gw->lp_health_sensitivity = sensitivity;
689 lnet_add_route_to_rnet(rnet2, route);
690 if (lnet_peer_discovery_disabled)
691 CWARN("Consider turning discovery on to enable full "
692 "Multi-Rail routing functionality\n");
696 * get rid of the reference on the lpni.
698 lnet_peer_ni_decref_locked(lpni);
699 lnet_net_unlock(LNET_LOCK_EX);
705 LIBCFS_FREE(route, sizeof(*route));
709 LIBCFS_FREE(rnet, sizeof(*rnet));
711 /* kick start the monitor thread to handle the added route */
712 complete(&the_lnet.ln_mt_wait_complete);
718 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
719 struct list_head *zombies)
721 struct lnet_peer *gateway;
722 struct lnet_route *route;
723 struct lnet_route *tmp;
725 list_for_each_entry_safe(route, tmp, route_list, lr_list) {
726 gateway = route->lr_gateway;
727 if (gw_nid != LNET_NID_ANY &&
728 gw_nid != gateway->lp_primary_nid)
732 * move to zombie to delete outside the lock
733 * Note that this function is called with the
734 * ln_api_mutex held as well as the exclusive net
735 * lock. Adding to the remote net list happens
736 * under the same conditions. Same goes for the
737 * gateway router list
739 list_move(&route->lr_list, zombies);
740 the_lnet.ln_remote_nets_version++;
742 list_del(&route->lr_gwlist);
743 lnet_rtr_decref_locked(gateway);
748 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
750 LIST_HEAD(rnet_zombies);
751 struct lnet_remotenet *rnet;
752 struct lnet_remotenet *tmp;
753 struct list_head *rn_list;
754 struct lnet_peer_ni *lpni;
755 struct lnet_route *route;
757 struct lnet_peer *lp = NULL;
760 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
761 libcfs_net2str(net), libcfs_nid2str(gw_nid));
763 /* NB Caller may specify either all routes via the given gateway
764 * or a specific route entry actual NIDs) */
766 lnet_net_lock(LNET_LOCK_EX);
768 lpni = lnet_find_peer_ni_locked(gw_nid);
770 lp = lpni->lpni_peer_net->lpn_peer;
772 gw_nid = lp->lp_primary_nid;
773 lnet_peer_ni_decref_locked(lpni);
776 if (net != LNET_NIDNET(LNET_NID_ANY)) {
777 rnet = lnet_find_rnet_locked(net);
779 lnet_net_unlock(LNET_LOCK_EX);
782 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
784 if (list_empty(&rnet->lrn_routes))
785 list_move(&rnet->lrn_list, &rnet_zombies);
789 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
790 rn_list = &the_lnet.ln_remote_nets_hash[i];
792 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
793 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
795 if (list_empty(&rnet->lrn_routes))
796 list_move(&rnet->lrn_list, &rnet_zombies);
802 * check if there are any routes remaining on the gateway
803 * If there are no more routes make sure to set the peer's
804 * lp_disc_net_id to 0 (invalid), in case we add more routes in
805 * the future on that gateway, then we start our discovery process
809 if (list_empty(&lp->lp_routes))
810 lp->lp_disc_net_id = 0;
813 lnet_net_unlock(LNET_LOCK_EX);
815 while (!list_empty(&zombies)) {
816 route = list_first_entry(&zombies, struct lnet_route, lr_list);
817 list_del(&route->lr_list);
818 LIBCFS_FREE(route, sizeof(*route));
821 while (!list_empty(&rnet_zombies)) {
822 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
824 list_del(&rnet->lrn_list);
825 LIBCFS_FREE(rnet, sizeof(*rnet));
832 lnet_destroy_routes (void)
834 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
837 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
839 struct lnet_rtrbufpool *rbp;
840 int i, rc = -ENOENT, j;
842 if (the_lnet.ln_rtrpools == NULL)
846 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
851 for (j = 0; j < LNET_NRBPOOLS; j++) {
852 pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
853 pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
854 pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
855 pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
862 lnet_net_lock(LNET_LOCK_EX);
863 pool_cfg->pl_routing = the_lnet.ln_routing;
864 lnet_net_unlock(LNET_LOCK_EX);
870 lnet_get_route(int idx, __u32 *net, __u32 *hops,
871 lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
873 struct lnet_remotenet *rnet;
874 struct list_head *rn_list;
875 struct lnet_route *route;
876 struct list_head *e1;
877 struct list_head *e2;
881 cpt = lnet_net_lock_current();
883 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
884 rn_list = &the_lnet.ln_remote_nets_hash[i];
885 list_for_each(e1, rn_list) {
886 rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
888 list_for_each(e2, &rnet->lrn_routes) {
889 route = list_entry(e2, struct lnet_route,
893 *net = rnet->lrn_net;
894 *gateway = route->lr_nid;
895 *hops = route->lr_hops;
896 *priority = route->lr_priority;
897 *sensitivity = route->lr_gateway->
898 lp_health_sensitivity;
899 *alive = lnet_is_route_alive(route);
900 lnet_net_unlock(cpt);
907 lnet_net_unlock(cpt);
912 lnet_wait_known_routerstate(void)
914 struct lnet_peer *rtr;
915 struct list_head *entry;
918 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
921 int cpt = lnet_net_lock_current();
924 list_for_each(entry, &the_lnet.ln_routers) {
925 rtr = list_entry(entry, struct lnet_peer,
928 spin_lock(&rtr->lp_lock);
930 if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
932 spin_unlock(&rtr->lp_lock);
935 spin_unlock(&rtr->lp_lock);
938 lnet_net_unlock(cpt);
943 set_current_state(TASK_UNINTERRUPTIBLE);
944 schedule_timeout(cfs_time_seconds(1));
949 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
954 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
957 ni->ni_status->ns_status != status) {
958 ni->ni_status->ns_status = status;
968 lnet_update_ni_status_locked(void)
970 struct lnet_net *net;
975 LASSERT(the_lnet.ln_routing);
977 timeout = router_ping_timeout + alive_router_check_interval;
979 now = ktime_get_real_seconds();
980 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
981 if (net->net_lnd->lnd_type == LOLND)
984 if (now < net->net_last_alive + timeout)
987 spin_lock(&net->net_lock);
988 /* re-check with lock */
989 if (now < net->net_last_alive + timeout) {
990 spin_unlock(&net->net_lock);
993 spin_unlock(&net->net_lock);
996 * if the net didn't receive any traffic for past the
997 * timeout on any of its constituent NIs, then mark all
1000 push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN);
1006 void lnet_wait_router_start(void)
1008 if (check_routers_before_use) {
1009 /* Note that a helpful side-effect of pinging all known routers
1010 * at startup is that it makes them drop stale connections they
1011 * may have to a previous instance of me. */
1012 lnet_wait_known_routerstate();
1017 * This function is called from the monitor thread to check if there are
1018 * any active routers that need to be checked.
1021 lnet_router_checker_active(void)
1023 /* Router Checker thread needs to run when routing is enabled in
1024 * order to call lnet_update_ni_status_locked() */
1025 if (the_lnet.ln_routing)
1028 return !list_empty(&the_lnet.ln_routers) &&
1029 alive_router_check_interval > 0;
1033 lnet_check_routers(void)
1035 struct lnet_peer_net *first_lpn = NULL;
1036 struct lnet_peer_net *lpn;
1037 struct lnet_peer_ni *lpni;
1038 struct list_head *entry;
1039 struct lnet_peer *rtr;
1048 cpt = lnet_net_lock_current();
1050 version = the_lnet.ln_routers_version;
1052 list_for_each(entry, &the_lnet.ln_routers) {
1053 rtr = list_entry(entry, struct lnet_peer,
1056 now = ktime_get_real_seconds();
1059 * only discover the router if we've passed
1060 * alive_router_check_interval seconds. Some of the router
1061 * interfaces could be down and in that case they would be
1062 * undergoing recovery separately from this discovery.
1064 /* find next peer net which is also local */
1065 net_id = rtr->lp_disc_net_id;
1067 lpn = lnet_get_next_peer_net_locked(rtr, net_id);
1069 CERROR("gateway %s has no networks\n",
1070 libcfs_nid2str(rtr->lp_primary_nid));
1073 if (first_lpn == lpn)
1077 found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id);
1078 net_id = lpn->lpn_net_id;
1079 } while (!found_lpn);
1081 if (!found_lpn || !lpn) {
1082 CERROR("no local network found for gateway %s\n",
1083 libcfs_nid2str(rtr->lp_primary_nid));
1087 if (now - lpn->lpn_rtrcheck_timestamp <
1088 alive_router_check_interval / lnet_current_net_count)
1092 * If we're currently discovering the peer then don't
1093 * issue another discovery
1095 spin_lock(&rtr->lp_lock);
1096 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) {
1097 spin_unlock(&rtr->lp_lock);
1100 /* make sure we actively discover the router */
1101 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1102 rtr->lp_state |= LNET_PEER_RTR_DISCOVERY;
1103 spin_unlock(&rtr->lp_lock);
1105 /* find the peer_ni associated with the primary NID */
1106 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
1108 CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
1109 libcfs_nid2str(rtr->lp_primary_nid));
1112 lnet_peer_ni_addref_locked(lpni);
1114 /* specify the net to use */
1115 rtr->lp_disc_net_id = lpn->lpn_net_id;
1117 /* discover the router */
1118 CDEBUG(D_NET, "discover %s, cpt = %d\n",
1119 libcfs_nid2str(lpni->lpni_nid), cpt);
1120 rc = lnet_discover_peer_locked(lpni, cpt, false);
1122 /* decrement ref count acquired by find_peer_ni_locked() */
1123 lnet_peer_ni_decref_locked(lpni);
1126 lpn->lpn_rtrcheck_timestamp = now;
1128 CERROR("Failed to discover router %s\n",
1129 libcfs_nid2str(rtr->lp_primary_nid));
1131 /* NB dropped lock */
1132 if (version != the_lnet.ln_routers_version) {
1133 /* the routers list has changed */
1138 if (the_lnet.ln_routing)
1139 push = lnet_update_ni_status_locked();
1141 lnet_net_unlock(cpt);
1143 /* if the status of the ni changed update the peers */
1145 lnet_push_update_to_peers(1);
1149 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1151 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1153 while (--npages >= 0)
1154 __free_page(rb->rb_kiov[npages].kiov_page);
1156 LIBCFS_FREE(rb, sz);
1159 static struct lnet_rtrbuf *
1160 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1162 int npages = rbp->rbp_npages;
1163 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1165 struct lnet_rtrbuf *rb;
1168 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1174 for (i = 0; i < npages; i++) {
1175 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1176 GFP_KERNEL | __GFP_ZERO);
1179 __free_page(rb->rb_kiov[i].kiov_page);
1181 LIBCFS_FREE(rb, sz);
1185 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
1186 rb->rb_kiov[i].kiov_offset = 0;
1187 rb->rb_kiov[i].kiov_page = page;
1194 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1196 int npages = rbp->rbp_npages;
1197 struct lnet_rtrbuf *rb;
1200 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1204 list_splice_init(&rbp->rbp_msgs, &tmp);
1205 lnet_drop_routed_msgs_locked(&tmp, cpt);
1206 list_splice_init(&rbp->rbp_bufs, &tmp);
1207 rbp->rbp_req_nbuffers = 0;
1208 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1209 rbp->rbp_mincredits = 0;
1210 lnet_net_unlock(cpt);
1212 /* Free buffers on the free list. */
1213 while (!list_empty(&tmp)) {
1214 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1215 list_del(&rb->rb_list);
1216 lnet_destroy_rtrbuf(rb, npages);
1221 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1224 struct lnet_rtrbuf *rb;
1226 int num_buffers = 0;
1228 int npages = rbp->rbp_npages;
1231 /* If we are called for less buffers than already in the pool, we
1232 * just lower the req_nbuffers number and excess buffers will be
1233 * thrown away as they are returned to the free list. Credits
1234 * then get adjusted as well.
1235 * If we already have enough buffers allocated to serve the
1236 * increase requested, then we can treat that the same way as we
1237 * do the decrease. */
1238 num_rb = nbufs - rbp->rbp_nbuffers;
1239 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1240 rbp->rbp_req_nbuffers = nbufs;
1241 lnet_net_unlock(cpt);
1244 /* store the older value of rbp_req_nbuffers and then set it to
1245 * the new request to prevent lnet_return_rx_credits_locked() from
1246 * freeing buffers that we need to keep around */
1247 old_req_nbufs = rbp->rbp_req_nbuffers;
1248 rbp->rbp_req_nbuffers = nbufs;
1249 lnet_net_unlock(cpt);
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 lp->lp_alive = alive;
1667 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
1668 lnet_set_route_aliveness(route, alive);
1670 lnet_net_unlock(cpt);
1674 EXPORT_SYMBOL(lnet_notify);