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");
121 static void lnet_add_route_to_rnet(struct lnet_remotenet *rnet,
122 struct lnet_route *route);
123 static void lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
124 struct list_head *zombies);
127 rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
130 unsigned *sen = (unsigned *)kp->arg;
133 rc = kstrtoul(val, 0, &value);
135 CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
139 if (value < 0 || value > 100) {
140 CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
145 * The purpose of locking the api_mutex here is to ensure that
146 * the correct value ends up stored properly.
148 mutex_lock(&the_lnet.ln_api_mutex);
152 mutex_unlock(&the_lnet.ln_api_mutex);
158 lnet_move_route(struct lnet_route *route, struct lnet_peer *lp,
159 struct list_head *rt_list)
161 struct lnet_remotenet *rnet;
162 struct list_head zombies;
165 INIT_LIST_HEAD(&zombies);
172 rnet = lnet_find_rnet_locked(route->lr_net);
175 CDEBUG(D_NET, "deleting route %s->%s\n",
176 libcfs_net2str(route->lr_net),
177 libcfs_nid2str(route->lr_nid));
180 * use the gateway's lp_primary_nid to delete the route as the
181 * lr_nid can be a constituent NID of the peer
183 lnet_del_route_from_rnet(route->lr_gateway->lp_primary_nid,
184 &rnet->lrn_routes, l);
187 route = list_first_entry(l, struct lnet_route,
189 route->lr_gateway = lp;
190 lnet_add_route_to_rnet(rnet, route);
192 while (!list_empty(l) && !rt_list) {
193 route = list_first_entry(l, struct lnet_route,
195 list_del(&route->lr_list);
196 LIBCFS_FREE(route, sizeof(*route));
202 lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target)
204 struct lnet_route *route;
205 struct lnet_route *tmp, *tmp2;
207 lnet_net_lock(LNET_LOCK_EX);
208 CDEBUG(D_NET, "transfering routes from %s -> %s\n",
209 libcfs_nid2str(src->lp_primary_nid),
210 libcfs_nid2str(target->lp_primary_nid));
211 list_for_each_entry(route, &src->lp_routes, lr_gwlist) {
212 CDEBUG(D_NET, "%s: %s->%s\n", libcfs_nid2str(src->lp_primary_nid),
213 libcfs_net2str(route->lr_net),
214 libcfs_nid2str(route->lr_nid));
216 list_splice_init(&src->lp_rtrq, &target->lp_rtrq);
217 list_for_each_entry_safe(route, tmp, &src->lp_routes, lr_gwlist) {
218 struct lnet_route *r2;
219 bool present = false;
220 list_for_each_entry_safe(r2, tmp2, &target->lp_routes, lr_gwlist) {
221 if (route->lr_net == r2->lr_net) {
222 if (route->lr_priority >= r2->lr_priority)
224 else if (route->lr_hops >= r2->lr_hops)
227 lnet_move_route(r2, NULL, NULL);
231 lnet_move_route(route, NULL, NULL);
233 lnet_move_route(route, target, NULL);
236 if (list_empty(&target->lp_rtr_list)) {
237 lnet_peer_addref_locked(target);
238 list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers);
241 the_lnet.ln_routers_version++;
242 lnet_net_unlock(LNET_LOCK_EX);
246 lnet_peers_start_down(void)
248 return check_routers_before_use;
252 * The peer_net of a gateway is alive if at least one of the peer_ni's on
253 * that peer_net is alive.
256 lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
258 struct lnet_peer_ni *lpni;
260 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
261 if (lnet_is_peer_ni_alive(lpni))
269 * a gateway is alive only if all its nets are alive
270 * called with cpt lock held
272 bool lnet_is_gateway_alive(struct lnet_peer *gw)
274 struct lnet_peer_net *lpn;
279 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
280 if (!lnet_is_gateway_net_alive(lpn))
288 * lnet_is_route_alive() needs to be called with cpt lock held
289 * A route is alive if the gateway can route between the local network and
290 * the remote network of the route.
291 * This means at least one NI is alive on each of the local and remote
292 * networks of the gateway.
294 bool lnet_is_route_alive(struct lnet_route *route)
296 struct lnet_peer *gw = route->lr_gateway;
297 struct lnet_peer_net *llpn;
298 struct lnet_peer_net *rlpn;
300 /* If the gateway is down then all routes are considered down */
305 * if discovery is disabled then rely on the cached aliveness
306 * information. This is handicapped information which we log when
307 * we receive the discovery ping response. The most uptodate
308 * aliveness information can only be obtained when discovery is
311 if (lnet_is_discovery_disabled(gw))
312 return route->lr_alive;
315 * check the gateway's interfaces on the local network
317 llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
321 if (!lnet_is_gateway_net_alive(llpn))
325 * For single hop routes avoid_asym_router_failure dictates
326 * that the remote net must exist on the gateway. For multi-hop
327 * routes the next-hop will not have the remote net.
329 if (avoid_asym_router_failure && route->lr_single_hop) {
330 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
333 if (!lnet_is_gateway_net_alive(rlpn))
337 spin_lock(&gw->lp_lock);
338 if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
339 spin_unlock(&gw->lp_lock);
340 if (gw->lp_rtr_refcount > 0)
341 CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
342 libcfs_nid2str(gw->lp_primary_nid));
345 spin_unlock(&gw->lp_lock);
351 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
352 struct lnet_peer *new_lp)
354 struct lnet_peer_ni *lpni;
355 struct lnet_route *route;
358 * Although a route is correlated with a peer, but when it's added
359 * a specific NID is used. That NID refers to a peer_ni within
360 * a peer. There could be other peer_nis on the same net, which
361 * can be used to send to that gateway. However when we are
362 * consolidating gateways because of discovery, the nid used to
363 * add the route might've moved between gateway peers. In this
364 * case we want to move the route to the new gateway as well. The
365 * intent here is not to confuse the user who added the route.
367 list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
368 lpni = lnet_peer_get_ni_locked(orig_lp, route->lr_nid);
370 lnet_net_lock(LNET_LOCK_EX);
371 list_move(&route->lr_gwlist, &new_lp->lp_routes);
372 lnet_net_unlock(LNET_LOCK_EX);
378 lnet_check_route_inconsistency(struct lnet_route *route)
380 if (!route->lr_single_hop && (int)route->lr_hops <= 1) {
381 CWARN("route %s->%s is detected to be multi-hop but hop count is set to %d\n",
382 libcfs_net2str(route->lr_net),
383 libcfs_nid2str(route->lr_gateway->lp_primary_nid),
384 (int) route->lr_hops);
389 lnet_set_route_hop_type(struct lnet_peer *gw, struct lnet_route *route)
391 struct lnet_peer_net *lpn;
392 bool single_hop = false;
394 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
395 if (route->lr_net == lpn->lpn_net_id) {
400 route->lr_single_hop = single_hop;
401 lnet_check_route_inconsistency(route);
404 /* Must hold net_lock/EX */
406 lnet_set_route_aliveness(struct lnet_route *route, bool alive)
408 /* Log when there's a state change */
409 if (route->lr_alive != alive) {
410 CERROR("route to %s through %s has gone from %s to %s\n",
411 libcfs_net2str(route->lr_net),
412 libcfs_nid2str(route->lr_gateway->lp_primary_nid),
413 (route->lr_alive) ? "up" : "down",
414 alive ? "up" : "down");
415 route->lr_alive = alive;
419 /* Must hold net_lock/EX */
421 lnet_router_discovery_ping_reply(struct lnet_peer *lp)
423 struct lnet_ping_buffer *pbuf = lp->lp_data;
424 struct lnet_peer_net *llpn;
425 struct lnet_route *route;
426 bool single_hop = false;
433 spin_lock(&lp->lp_lock);
434 lp_state = lp->lp_state;
436 /* only handle replies if discovery is disabled. */
437 if (!lnet_is_discovery_disabled_locked(lp)) {
438 spin_unlock(&lp->lp_lock);
442 spin_unlock(&lp->lp_lock);
444 if (lp_state & LNET_PEER_PING_FAILED ||
445 pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
446 CDEBUG(D_NET, "Set routes down for gw %s because %s %d\n",
447 libcfs_nid2str(lp->lp_primary_nid),
448 lp_state & LNET_PEER_PING_FAILED ? "ping failed" :
449 "route feature is disabled", lp->lp_ping_error);
450 /* If the ping failed or the peer has routing disabled then
451 * mark the routes served by this peer down
453 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
454 lnet_set_route_aliveness(route, false);
458 CDEBUG(D_NET, "Discovery is disabled. Processing reply for gw: %s:%d\n",
459 libcfs_nid2str(lp->lp_primary_nid), pbuf->pb_info.pi_nnis);
462 * examine the ping response to determine if the routes on that
463 * gateway should be declared alive.
464 * The route is alive if:
465 * 1. local network to reach the route is alive and
466 * 2. route is single hop, avoid_async_router_failure is set and
467 * there exists at least one NI on the route's remote net
469 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
470 llpn = lnet_peer_get_net_locked(lp, route->lr_lnet);
472 lnet_set_route_aliveness(route, false);
476 if (!lnet_is_gateway_net_alive(llpn)) {
477 lnet_set_route_aliveness(route, false);
481 single_hop = net_up = false;
482 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
483 net = LNET_NIDNET(pbuf->pb_info.pi_ni[i].ns_nid);
485 if (route->lr_net == net) {
487 if (pbuf->pb_info.pi_ni[i].ns_status ==
495 route->lr_single_hop = single_hop;
496 if (avoid_asym_router_failure && single_hop)
497 lnet_set_route_aliveness(route, net_up);
499 lnet_set_route_aliveness(route, true);
502 * warn that the route is configured as single-hop but it
503 * really is multi-hop as far as we can tell.
505 lnet_check_route_inconsistency(route);
510 lnet_router_discovery_complete(struct lnet_peer *lp)
512 struct lnet_peer_ni *lpni = NULL;
513 struct lnet_route *route;
515 spin_lock(&lp->lp_lock);
516 lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
517 lp->lp_state |= LNET_PEER_RTR_DISCOVERED;
518 lp->lp_alive = lp->lp_dc_error == 0;
519 spin_unlock(&lp->lp_lock);
521 /* ping replies are being handled when discovery is disabled */
522 if (lnet_is_discovery_disabled_locked(lp))
525 if (!lp->lp_dc_error) {
527 * mark single-hop routes. If the remote net is not configured on
528 * the gateway we assume this is intentional and we mark the
529 * gateway as multi-hop
531 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
532 lnet_set_route_aliveness(route, true);
533 lnet_set_route_hop_type(lp, route);
540 * We do not send messages directly to the remote interfaces
541 * of an LNet router. As such, we rely on the PING response
542 * to determine the up/down status of these interfaces. If
543 * a PING response is not receieved, or some other problem with
544 * discovery occurs that prevents us from getting this status,
545 * we assume all interfaces are down until we're able to
546 * determine otherwise.
548 CDEBUG(D_NET, "%s: Router discovery failed %d\n",
549 libcfs_nid2str(lp->lp_primary_nid), lp->lp_dc_error);
550 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
551 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
553 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
554 lnet_set_route_aliveness(route, false);
558 lnet_rtr_addref_locked(struct lnet_peer *lp)
560 LASSERT(lp->lp_rtr_refcount >= 0);
562 /* lnet_net_lock must be exclusively locked */
563 lp->lp_rtr_refcount++;
564 if (lp->lp_rtr_refcount == 1) {
565 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
566 /* addref for the_lnet.ln_routers */
567 lnet_peer_addref_locked(lp);
568 the_lnet.ln_routers_version++;
573 lnet_rtr_decref_locked(struct lnet_peer *lp)
575 LASSERT(atomic_read(&lp->lp_refcount) > 0);
576 LASSERT(lp->lp_rtr_refcount > 0);
578 /* lnet_net_lock must be exclusively locked */
579 lp->lp_rtr_refcount--;
580 if (lp->lp_rtr_refcount == 0) {
581 LASSERT(list_empty(&lp->lp_routes));
583 list_del(&lp->lp_rtr_list);
584 /* decref for the_lnet.ln_routers */
585 lnet_peer_decref_locked(lp);
586 the_lnet.ln_routers_version++;
590 struct lnet_remotenet *
591 lnet_find_rnet_locked(__u32 net)
593 struct lnet_remotenet *rnet;
594 struct list_head *tmp;
595 struct list_head *rn_list;
597 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
599 rn_list = lnet_net2rnethash(net);
600 list_for_each(tmp, rn_list) {
601 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
603 if (rnet->lrn_net == net)
609 static void lnet_shuffle_seed(void)
612 struct lnet_ni *ni = NULL;
617 /* Nodes with small feet have little entropy
618 * the NID for this node gives the most entropy in the low bits */
619 while ((ni = lnet_get_next_ni_locked(NULL, ni)))
620 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
625 /* NB expects LNET_LOCK held */
627 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
629 struct lnet_peer_net *lpn;
630 unsigned int offset = 0;
631 unsigned int len = 0;
636 list_for_each(e, &rnet->lrn_routes)
640 * Randomly adding routes to the list is done to ensure that when
641 * different nodes are using the same list of routers, they end up
642 * preferring different routers.
644 offset = prandom_u32_max(len + 1);
645 list_for_each(e, &rnet->lrn_routes) {
650 list_add(&route->lr_list, e);
652 * force a router check on the gateway to make sure the route is
655 list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
657 lpn->lpn_rtrcheck_timestamp = 0;
660 the_lnet.ln_remote_nets_version++;
662 /* add the route on the gateway list */
663 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
665 /* take a router reference count on the gateway */
666 lnet_rtr_addref_locked(route->lr_gateway);
670 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
671 __u32 priority, __u32 sensitivity)
673 struct list_head *route_entry;
674 struct lnet_remotenet *rnet;
675 struct lnet_remotenet *rnet2;
676 struct lnet_route *route;
677 struct lnet_peer_ni *lpni;
678 struct lnet_peer *gw;
682 CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
683 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
685 if (gateway == LNET_NID_ANY ||
686 gateway == LNET_NID_LO_0 ||
687 net == LNET_NET_ANY ||
688 LNET_NETTYP(net) == LOLND ||
689 LNET_NIDNET(gateway) == net ||
690 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
693 /* it's a local network */
694 if (lnet_islocalnet(net))
697 if (!lnet_islocalnet(LNET_NIDNET(gateway))) {
698 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
699 libcfs_nid2str(gateway),
700 libcfs_net2str(LNET_NIDNET(gateway)));
701 return -EHOSTUNREACH;
704 /* Assume net, route, all new */
705 LIBCFS_ALLOC(route, sizeof(*route));
706 LIBCFS_ALLOC(rnet, sizeof(*rnet));
707 if (route == NULL || rnet == NULL) {
708 CERROR("Out of memory creating route %s %d %s\n",
709 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
711 LIBCFS_FREE(route, sizeof(*route));
713 LIBCFS_FREE(rnet, sizeof(*rnet));
717 INIT_LIST_HEAD(&rnet->lrn_routes);
719 /* store the local and remote net that the route represents */
720 route->lr_lnet = LNET_NIDNET(gateway);
722 route->lr_nid = gateway;
723 route->lr_priority = priority;
724 route->lr_hops = hops;
726 lnet_net_lock(LNET_LOCK_EX);
729 * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
730 * lose that once we're done
732 lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
734 lnet_net_unlock(LNET_LOCK_EX);
736 LIBCFS_FREE(route, sizeof(*route));
737 LIBCFS_FREE(rnet, sizeof(*rnet));
740 CERROR("Error %d creating route %s %d %s\n", rc,
741 libcfs_net2str(net), hops,
742 libcfs_nid2str(gateway));
746 LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
747 gw = lpni->lpni_peer_net->lpn_peer;
749 route->lr_gateway = gw;
751 rnet2 = lnet_find_rnet_locked(net);
754 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
758 /* Search for a duplicate route (it's a NOOP if it is) */
760 list_for_each(route_entry, &rnet2->lrn_routes) {
761 struct lnet_route *route2;
763 route2 = list_entry(route_entry, struct lnet_route, lr_list);
764 if (route2->lr_gateway == route->lr_gateway) {
769 /* our lookups must be true */
770 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
774 * It is possible to add multiple routes through the same peer,
775 * but it'll be using a different NID of that peer. When the
776 * gateway is discovered, discovery will consolidate the different
777 * peers into one peer. In this case the discovery code will have
778 * to move the routes from the peer that's being deleted to the
779 * consolidated peer lp_routes list
782 gw->lp_health_sensitivity = sensitivity;
783 lnet_add_route_to_rnet(rnet2, route);
784 if (lnet_peer_discovery_disabled)
785 CWARN("Consider turning discovery on to enable full "
786 "Multi-Rail routing functionality\n");
790 * get rid of the reference on the lpni.
792 lnet_peer_ni_decref_locked(lpni);
793 lnet_net_unlock(LNET_LOCK_EX);
799 LIBCFS_FREE(route, sizeof(*route));
803 LIBCFS_FREE(rnet, sizeof(*rnet));
805 /* kick start the monitor thread to handle the added route */
806 complete(&the_lnet.ln_mt_wait_complete);
812 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
813 struct list_head *zombies)
815 struct lnet_peer *gateway;
816 struct lnet_route *route;
817 struct lnet_route *tmp;
819 list_for_each_entry_safe(route, tmp, route_list, lr_list) {
820 gateway = route->lr_gateway;
821 if (gw_nid != LNET_NID_ANY &&
822 gw_nid != gateway->lp_primary_nid)
826 * move to zombie to delete outside the lock
827 * Note that this function is called with the
828 * ln_api_mutex held as well as the exclusive net
829 * lock. Adding to the remote net list happens
830 * under the same conditions. Same goes for the
831 * gateway router list
833 list_move(&route->lr_list, zombies);
834 the_lnet.ln_remote_nets_version++;
836 list_del(&route->lr_gwlist);
837 lnet_rtr_decref_locked(gateway);
842 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
844 LIST_HEAD(rnet_zombies);
845 struct lnet_remotenet *rnet;
846 struct lnet_remotenet *tmp;
847 struct list_head *rn_list;
848 struct lnet_peer_ni *lpni;
849 struct lnet_route *route;
851 struct lnet_peer *lp = NULL;
854 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
855 libcfs_net2str(net), libcfs_nid2str(gw_nid));
857 /* NB Caller may specify either all routes via the given gateway
858 * or a specific route entry actual NIDs) */
860 lnet_net_lock(LNET_LOCK_EX);
862 lpni = lnet_find_peer_ni_locked(gw_nid);
864 lp = lpni->lpni_peer_net->lpn_peer;
866 gw_nid = lp->lp_primary_nid;
867 lnet_peer_ni_decref_locked(lpni);
870 if (net != LNET_NET_ANY) {
871 rnet = lnet_find_rnet_locked(net);
873 lnet_net_unlock(LNET_LOCK_EX);
876 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
878 if (list_empty(&rnet->lrn_routes))
879 list_move(&rnet->lrn_list, &rnet_zombies);
883 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
884 rn_list = &the_lnet.ln_remote_nets_hash[i];
886 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
887 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
889 if (list_empty(&rnet->lrn_routes))
890 list_move(&rnet->lrn_list, &rnet_zombies);
896 * check if there are any routes remaining on the gateway
897 * If there are no more routes make sure to set the peer's
898 * lp_disc_net_id to 0 (invalid), in case we add more routes in
899 * the future on that gateway, then we start our discovery process
903 if (list_empty(&lp->lp_routes))
904 lp->lp_disc_net_id = 0;
907 lnet_net_unlock(LNET_LOCK_EX);
909 while (!list_empty(&zombies)) {
910 route = list_first_entry(&zombies, struct lnet_route, lr_list);
911 list_del(&route->lr_list);
912 LIBCFS_FREE(route, sizeof(*route));
915 while (!list_empty(&rnet_zombies)) {
916 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
918 list_del(&rnet->lrn_list);
919 LIBCFS_FREE(rnet, sizeof(*rnet));
926 lnet_destroy_routes (void)
928 lnet_del_route(LNET_NET_ANY, LNET_NID_ANY);
931 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
933 struct lnet_rtrbufpool *rbp;
934 int i, rc = -ENOENT, j;
936 if (the_lnet.ln_rtrpools == NULL)
940 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
945 for (j = 0; j < LNET_NRBPOOLS; j++) {
946 pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
947 pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
948 pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
949 pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
956 lnet_net_lock(LNET_LOCK_EX);
957 pool_cfg->pl_routing = the_lnet.ln_routing;
958 lnet_net_unlock(LNET_LOCK_EX);
964 lnet_get_route(int idx, __u32 *net, __u32 *hops,
965 lnet_nid_t *gateway, __u32 *flags, __u32 *priority, __u32 *sensitivity)
967 struct lnet_remotenet *rnet;
968 struct list_head *rn_list;
969 struct lnet_route *route;
970 struct list_head *e1;
971 struct list_head *e2;
975 cpt = lnet_net_lock_current();
977 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
978 rn_list = &the_lnet.ln_remote_nets_hash[i];
979 list_for_each(e1, rn_list) {
980 rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
982 list_for_each(e2, &rnet->lrn_routes) {
983 route = list_entry(e2, struct lnet_route,
987 *net = rnet->lrn_net;
988 *gateway = route->lr_nid;
989 *hops = route->lr_hops;
990 *priority = route->lr_priority;
991 *sensitivity = route->lr_gateway->
992 lp_health_sensitivity;
993 if (lnet_is_route_alive(route))
994 *flags |= LNET_RT_ALIVE;
996 *flags &= ~LNET_RT_ALIVE;
997 if (route->lr_single_hop)
998 *flags &= ~LNET_RT_MULTI_HOP;
1000 *flags |= LNET_RT_MULTI_HOP;
1001 lnet_net_unlock(cpt);
1008 lnet_net_unlock(cpt);
1013 lnet_wait_known_routerstate(void)
1015 struct lnet_peer *rtr;
1016 struct list_head *entry;
1019 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
1022 int cpt = lnet_net_lock_current();
1025 list_for_each(entry, &the_lnet.ln_routers) {
1026 rtr = list_entry(entry, struct lnet_peer,
1029 spin_lock(&rtr->lp_lock);
1031 if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
1033 spin_unlock(&rtr->lp_lock);
1036 spin_unlock(&rtr->lp_lock);
1039 lnet_net_unlock(cpt);
1044 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1049 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
1052 bool update = false;
1054 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1055 if (lnet_ni_set_status(ni, status))
1062 lnet_update_ni_status_locked(void)
1064 struct lnet_net *net;
1070 LASSERT(the_lnet.ln_routing);
1072 timeout = router_ping_timeout + alive_router_check_interval;
1074 now = ktime_get_real_seconds();
1075 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1076 if (net->net_lnd->lnd_type == LOLND)
1079 if (now < net->net_last_alive + timeout)
1080 goto check_ni_fatal;
1082 spin_lock(&net->net_lock);
1083 /* re-check with lock */
1084 if (now < net->net_last_alive + timeout) {
1085 spin_unlock(&net->net_lock);
1086 goto check_ni_fatal;
1088 spin_unlock(&net->net_lock);
1091 * if the net didn't receive any traffic for past the
1092 * timeout on any of its constituent NIs, then mark all
1095 if (lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN)) {
1101 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1102 /* lnet_ni_set_status() will perform the same check of
1103 * ni_status while holding the ni lock. We can safely
1104 * check ni_status without that lock because it is only
1105 * written to under net_lock/EX and our caller is
1106 * holding a net lock.
1108 if (atomic_read(&ni->ni_fatal_error_on) &&
1110 ni->ni_status->ns_status != LNET_NI_STATUS_DOWN &&
1111 lnet_ni_set_status(ni, LNET_NI_STATUS_DOWN))
1119 void lnet_wait_router_start(void)
1121 if (check_routers_before_use) {
1122 /* Note that a helpful side-effect of pinging all known routers
1123 * at startup is that it makes them drop stale connections they
1124 * may have to a previous instance of me. */
1125 lnet_wait_known_routerstate();
1130 * This function is called from the monitor thread to check if there are
1131 * any active routers that need to be checked.
1133 bool lnet_router_checker_active(void)
1135 /* Router Checker thread needs to run when routing is enabled in
1136 * order to call lnet_update_ni_status_locked() */
1137 if (the_lnet.ln_routing)
1140 return !list_empty(&the_lnet.ln_routers) &&
1141 alive_router_check_interval > 0;
1145 lnet_check_routers(void)
1147 struct lnet_peer_net *first_lpn = NULL;
1148 struct lnet_peer_net *lpn;
1149 struct lnet_peer_ni *lpni;
1150 struct list_head *entry;
1151 struct lnet_peer *rtr;
1160 cpt = lnet_net_lock_current();
1162 version = the_lnet.ln_routers_version;
1164 list_for_each(entry, &the_lnet.ln_routers) {
1165 rtr = list_entry(entry, struct lnet_peer,
1168 now = ktime_get_real_seconds();
1171 * only discover the router if we've passed
1172 * alive_router_check_interval seconds. Some of the router
1173 * interfaces could be down and in that case they would be
1174 * undergoing recovery separately from this discovery.
1176 /* find next peer net which is also local */
1177 net_id = rtr->lp_disc_net_id;
1179 lpn = lnet_get_next_peer_net_locked(rtr, net_id);
1181 CERROR("gateway %s has no networks\n",
1182 libcfs_nid2str(rtr->lp_primary_nid));
1185 if (first_lpn == lpn)
1189 found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id);
1190 net_id = lpn->lpn_net_id;
1191 } while (!found_lpn);
1193 if (!found_lpn || !lpn) {
1194 CERROR("no local network found for gateway %s\n",
1195 libcfs_nid2str(rtr->lp_primary_nid));
1199 if (now - lpn->lpn_rtrcheck_timestamp <
1200 alive_router_check_interval / lnet_current_net_count)
1204 * If we're currently discovering the peer then don't
1205 * issue another discovery
1207 spin_lock(&rtr->lp_lock);
1208 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) {
1209 spin_unlock(&rtr->lp_lock);
1212 /* make sure we fully discover the router */
1213 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1214 rtr->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH |
1215 LNET_PEER_RTR_DISCOVERY;
1216 spin_unlock(&rtr->lp_lock);
1218 /* find the peer_ni associated with the primary NID */
1219 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
1221 CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
1222 libcfs_nid2str(rtr->lp_primary_nid));
1225 lnet_peer_ni_addref_locked(lpni);
1227 /* specify the net to use */
1228 rtr->lp_disc_net_id = lpn->lpn_net_id;
1230 /* discover the router */
1231 CDEBUG(D_NET, "discover %s, cpt = %d\n",
1232 libcfs_nid2str(lpni->lpni_nid), cpt);
1233 rc = lnet_discover_peer_locked(lpni, cpt, false);
1235 /* decrement ref count acquired by find_peer_ni_locked() */
1236 lnet_peer_ni_decref_locked(lpni);
1239 lpn->lpn_rtrcheck_timestamp = now;
1241 CERROR("Failed to discover router %s\n",
1242 libcfs_nid2str(rtr->lp_primary_nid));
1244 /* NB dropped lock */
1245 if (version != the_lnet.ln_routers_version) {
1246 /* the routers list has changed */
1251 if (the_lnet.ln_routing)
1252 push = lnet_update_ni_status_locked();
1254 lnet_net_unlock(cpt);
1256 /* if the status of the ni changed update the peers */
1258 lnet_push_update_to_peers(1);
1262 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1264 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1266 while (--npages >= 0)
1267 __free_page(rb->rb_kiov[npages].bv_page);
1269 LIBCFS_FREE(rb, sz);
1272 static struct lnet_rtrbuf *
1273 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1275 int npages = rbp->rbp_npages;
1276 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1278 struct lnet_rtrbuf *rb;
1281 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1287 for (i = 0; i < npages; i++) {
1288 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1289 GFP_KERNEL | __GFP_ZERO);
1292 __free_page(rb->rb_kiov[i].bv_page);
1294 LIBCFS_FREE(rb, sz);
1298 rb->rb_kiov[i].bv_len = PAGE_SIZE;
1299 rb->rb_kiov[i].bv_offset = 0;
1300 rb->rb_kiov[i].bv_page = page;
1307 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1309 int npages = rbp->rbp_npages;
1310 struct lnet_rtrbuf *rb;
1313 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1317 list_splice_init(&rbp->rbp_msgs, &tmp);
1318 lnet_drop_routed_msgs_locked(&tmp, cpt);
1319 list_splice_init(&rbp->rbp_bufs, &tmp);
1320 rbp->rbp_req_nbuffers = 0;
1321 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1322 rbp->rbp_mincredits = 0;
1323 lnet_net_unlock(cpt);
1325 /* Free buffers on the free list. */
1326 while (!list_empty(&tmp)) {
1327 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1328 list_del(&rb->rb_list);
1329 lnet_destroy_rtrbuf(rb, npages);
1334 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1337 struct lnet_rtrbuf *rb;
1339 int num_buffers = 0;
1341 int npages = rbp->rbp_npages;
1344 /* If we are called for less buffers than already in the pool, we
1345 * just lower the req_nbuffers number and excess buffers will be
1346 * thrown away as they are returned to the free list. Credits
1347 * then get adjusted as well.
1348 * If we already have enough buffers allocated to serve the
1349 * increase requested, then we can treat that the same way as we
1350 * do the decrease. */
1351 num_rb = nbufs - rbp->rbp_nbuffers;
1352 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1353 rbp->rbp_req_nbuffers = nbufs;
1354 lnet_net_unlock(cpt);
1357 /* store the older value of rbp_req_nbuffers and then set it to
1358 * the new request to prevent lnet_return_rx_credits_locked() from
1359 * freeing buffers that we need to keep around */
1360 old_req_nbufs = rbp->rbp_req_nbuffers;
1361 rbp->rbp_req_nbuffers = nbufs;
1362 lnet_net_unlock(cpt);
1364 /* allocate the buffers on a local list first. If all buffers are
1365 * allocated successfully then join this list to the rbp buffer
1366 * list. If not then free all allocated buffers. */
1367 while (num_rb-- > 0) {
1368 rb = lnet_new_rtrbuf(rbp, cpt);
1370 CERROR("Failed to allocate %d route bufs of %d pages\n",
1374 rbp->rbp_req_nbuffers = old_req_nbufs;
1375 lnet_net_unlock(cpt);
1380 list_add(&rb->rb_list, &rb_list);
1386 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1387 rbp->rbp_nbuffers += num_buffers;
1388 rbp->rbp_credits += num_buffers;
1389 rbp->rbp_mincredits = rbp->rbp_credits;
1390 /* We need to schedule blocked msg using the newly
1392 while (!list_empty(&rbp->rbp_bufs) &&
1393 !list_empty(&rbp->rbp_msgs))
1394 lnet_schedule_blocked_locked(rbp);
1396 lnet_net_unlock(cpt);
1401 while (!list_empty(&rb_list)) {
1402 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1403 list_del(&rb->rb_list);
1404 lnet_destroy_rtrbuf(rb, npages);
1411 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1413 INIT_LIST_HEAD(&rbp->rbp_msgs);
1414 INIT_LIST_HEAD(&rbp->rbp_bufs);
1416 rbp->rbp_npages = npages;
1417 rbp->rbp_credits = 0;
1418 rbp->rbp_mincredits = 0;
1422 lnet_rtrpools_free(int keep_pools)
1424 struct lnet_rtrbufpool *rtrp;
1427 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1430 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1431 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1432 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1433 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1437 cfs_percpt_free(the_lnet.ln_rtrpools);
1438 the_lnet.ln_rtrpools = NULL;
1443 lnet_nrb_tiny_calculate(void)
1445 int nrbs = LNET_NRB_TINY;
1447 if (tiny_router_buffers < 0) {
1448 LCONSOLE_ERROR_MSG(0x10c,
1449 "tiny_router_buffers=%d invalid when "
1450 "routing enabled\n", tiny_router_buffers);
1454 if (tiny_router_buffers > 0)
1455 nrbs = tiny_router_buffers;
1457 nrbs /= LNET_CPT_NUMBER;
1458 return max(nrbs, LNET_NRB_TINY_MIN);
1462 lnet_nrb_small_calculate(void)
1464 int nrbs = LNET_NRB_SMALL;
1466 if (small_router_buffers < 0) {
1467 LCONSOLE_ERROR_MSG(0x10c,
1468 "small_router_buffers=%d invalid when "
1469 "routing enabled\n", small_router_buffers);
1473 if (small_router_buffers > 0)
1474 nrbs = small_router_buffers;
1476 nrbs /= LNET_CPT_NUMBER;
1477 return max(nrbs, LNET_NRB_SMALL_MIN);
1481 lnet_nrb_large_calculate(void)
1483 int nrbs = LNET_NRB_LARGE;
1485 if (large_router_buffers < 0) {
1486 LCONSOLE_ERROR_MSG(0x10c,
1487 "large_router_buffers=%d invalid when "
1488 "routing enabled\n", large_router_buffers);
1492 if (large_router_buffers > 0)
1493 nrbs = large_router_buffers;
1495 nrbs /= LNET_CPT_NUMBER;
1496 return max(nrbs, LNET_NRB_LARGE_MIN);
1500 lnet_rtrpools_alloc(int im_a_router)
1502 struct lnet_rtrbufpool *rtrp;
1509 if (!strcmp(forwarding, "")) {
1510 /* not set either way */
1513 } else if (!strcmp(forwarding, "disabled")) {
1514 /* explicitly disabled */
1516 } else if (!strcmp(forwarding, "enabled")) {
1517 /* explicitly enabled */
1519 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1520 "'enabled' or 'disabled'\n");
1524 nrb_tiny = lnet_nrb_tiny_calculate();
1528 nrb_small = lnet_nrb_small_calculate();
1532 nrb_large = lnet_nrb_large_calculate();
1536 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1538 sizeof(struct lnet_rtrbufpool));
1539 if (the_lnet.ln_rtrpools == NULL) {
1540 LCONSOLE_ERROR_MSG(0x10c,
1541 "Failed to initialize router buffe pool\n");
1545 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1546 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1547 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1552 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1553 LNET_NRB_SMALL_PAGES);
1554 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1559 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1560 LNET_NRB_LARGE_PAGES);
1561 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1567 lnet_net_lock(LNET_LOCK_EX);
1568 the_lnet.ln_routing = 1;
1569 lnet_net_unlock(LNET_LOCK_EX);
1570 complete(&the_lnet.ln_mt_wait_complete);
1574 lnet_rtrpools_free(0);
1579 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1584 struct lnet_rtrbufpool *rtrp;
1586 /* If the provided values for each buffer pool are different than the
1587 * configured values, we need to take action. */
1589 tiny_router_buffers = tiny;
1590 nrb = lnet_nrb_tiny_calculate();
1591 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1592 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1599 small_router_buffers = small;
1600 nrb = lnet_nrb_small_calculate();
1601 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1602 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1609 large_router_buffers = large;
1610 nrb = lnet_nrb_large_calculate();
1611 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1612 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1623 lnet_rtrpools_adjust(int tiny, int small, int large)
1625 /* this function doesn't revert the changes if adding new buffers
1626 * failed. It's up to the user space caller to revert the
1629 if (!the_lnet.ln_routing)
1632 return lnet_rtrpools_adjust_helper(tiny, small, large);
1636 lnet_rtrpools_enable(void)
1640 if (the_lnet.ln_routing)
1643 if (the_lnet.ln_rtrpools == NULL)
1644 /* If routing is turned off, and we have never
1645 * initialized the pools before, just call the
1646 * standard buffer pool allocation routine as
1647 * if we are just configuring this for the first
1649 rc = lnet_rtrpools_alloc(1);
1651 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1655 lnet_net_lock(LNET_LOCK_EX);
1656 the_lnet.ln_routing = 1;
1658 the_lnet.ln_ping_target->pb_info.pi_features &=
1659 ~LNET_PING_FEAT_RTE_DISABLED;
1660 lnet_net_unlock(LNET_LOCK_EX);
1662 if (lnet_peer_discovery_disabled)
1663 CWARN("Consider turning discovery on to enable full "
1664 "Multi-Rail routing functionality\n");
1670 lnet_rtrpools_disable(void)
1672 if (!the_lnet.ln_routing)
1675 lnet_net_lock(LNET_LOCK_EX);
1676 the_lnet.ln_routing = 0;
1677 the_lnet.ln_ping_target->pb_info.pi_features |=
1678 LNET_PING_FEAT_RTE_DISABLED;
1680 tiny_router_buffers = 0;
1681 small_router_buffers = 0;
1682 large_router_buffers = 0;
1683 lnet_net_unlock(LNET_LOCK_EX);
1684 lnet_rtrpools_free(1);
1688 lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid)
1690 if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1691 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1695 * ni: local NI used to communicate with the peer
1697 * alive: true if peer is alive, false otherwise
1698 * reset: reset health value. This is requested by the LND.
1699 * when: notificaiton time.
1702 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
1705 struct lnet_peer_ni *lpni = NULL;
1706 struct lnet_route *route;
1707 struct lnet_peer *lp;
1708 time64_t now = ktime_get_seconds();
1711 LASSERT(!in_interrupt());
1713 CDEBUG(D_NET, "%s notifying %s: %s\n",
1714 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1715 libcfs_nid2str(nid), alive ? "up" : "down");
1718 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1719 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1720 libcfs_nid2str(nid), alive ? "birth" : "death",
1721 libcfs_nid2str(ni->ni_nid));
1725 /* can't do predictions... */
1727 CWARN("Ignoring prediction from %s of %s %s "
1728 "%lld seconds in the future\n",
1729 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1730 libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1734 if (ni != NULL && !alive && /* LND telling me she's down */
1735 !auto_down) { /* auto-down disabled */
1736 CDEBUG(D_NET, "Auto-down disabled\n");
1740 /* must lock 0 since this is used for synchronization */
1743 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1748 lpni = lnet_find_peer_ni_locked(nid);
1752 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1758 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
1759 lnet_set_lpni_healthv_locked(lpni,
1760 LNET_MAX_HEALTH_VALUE);
1762 __u32 sensitivity = lpni->lpni_peer_net->
1763 lpn_peer->lp_health_sensitivity;
1765 lnet_inc_lpni_healthv_locked(lpni,
1766 (sensitivity) ? sensitivity :
1767 lnet_health_sensitivity);
1770 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
1773 /* recalculate aliveness */
1774 alive = lnet_is_peer_ni_alive(lpni);
1776 lp = lpni->lpni_peer_net->lpn_peer;
1777 /* If this is an LNet router then update route aliveness */
1778 if (lp->lp_rtr_refcount) {
1780 /* reset flag indicates gateway peer went up or down */
1781 lp->lp_alive = alive;
1783 /* If discovery is disabled, locally or on the gateway, then
1784 * any routes using lpni as next-hop need to be updated
1786 * NB: We can get many notifications while a route is down, so
1787 * we try and avoid the expensive net_lock/EX here for the
1788 * common case of receiving duplicate lnet_notify() calls (i.e.
1789 * only grab EX lock when we actually need to update the route
1792 if (lnet_is_discovery_disabled(lp)) {
1793 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
1794 if (route->lr_nid == lpni->lpni_nid &&
1795 route->lr_alive != alive) {
1797 lnet_net_lock(LNET_LOCK_EX);
1798 lnet_set_route_aliveness(route, alive);
1799 lnet_net_unlock(LNET_LOCK_EX);
1808 if (ni != NULL && !alive)
1809 lnet_notify_peer_down(ni, lpni->lpni_nid);
1811 cpt = lpni->lpni_cpt;
1813 lnet_peer_ni_decref_locked(lpni);
1814 lnet_net_unlock(cpt);
1818 EXPORT_SYMBOL(lnet_notify);