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 atomic_read(&route->lr_alive) == 1;
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 &&
330 (route->lr_hops == 1 || route->lr_hops == LNET_UNDEFINED_HOPS)) {
331 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
334 if (!lnet_is_gateway_net_alive(rlpn))
338 spin_lock(&gw->lp_lock);
339 if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
340 spin_unlock(&gw->lp_lock);
341 if (gw->lp_rtr_refcount > 0)
342 CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
343 libcfs_nid2str(gw->lp_primary_nid));
346 spin_unlock(&gw->lp_lock);
352 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
353 struct lnet_peer *new_lp)
355 struct lnet_peer_ni *lpni;
356 struct lnet_route *route;
359 * Although a route is correlated with a peer, but when it's added
360 * a specific NID is used. That NID refers to a peer_ni within
361 * a peer. There could be other peer_nis on the same net, which
362 * can be used to send to that gateway. However when we are
363 * consolidating gateways because of discovery, the nid used to
364 * add the route might've moved between gateway peers. In this
365 * case we want to move the route to the new gateway as well. The
366 * intent here is not to confuse the user who added the route.
368 list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
369 lpni = lnet_peer_get_ni_locked(orig_lp, route->lr_nid);
371 lnet_net_lock(LNET_LOCK_EX);
372 list_move(&route->lr_gwlist, &new_lp->lp_routes);
373 lnet_net_unlock(LNET_LOCK_EX);
379 lnet_check_route_inconsistency(struct lnet_route *route)
381 if (!route->lr_single_hop &&
382 (route->lr_hops == 1 || route->lr_hops == LNET_UNDEFINED_HOPS)) {
383 CWARN("route %s->%s is detected to be multi-hop but hop count is set to %d\n",
384 libcfs_net2str(route->lr_net),
385 libcfs_nid2str(route->lr_gateway->lp_primary_nid),
386 (int) route->lr_hops);
391 lnet_set_route_hop_type(struct lnet_peer *gw, struct lnet_route *route)
393 struct lnet_peer_net *lpn;
394 bool single_hop = false;
396 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
397 if (route->lr_net == lpn->lpn_net_id) {
402 route->lr_single_hop = single_hop;
403 lnet_check_route_inconsistency(route);
406 /* Must hold net_lock/EX */
408 lnet_router_discovery_ping_reply(struct lnet_peer *lp)
410 struct lnet_ping_buffer *pbuf = lp->lp_data;
411 struct lnet_peer_net *llpn;
412 struct lnet_route *route;
413 bool single_hop = false;
420 spin_lock(&lp->lp_lock);
421 lp_state = lp->lp_state;
423 /* only handle replies if discovery is disabled. */
424 if (!lnet_is_discovery_disabled_locked(lp)) {
425 spin_unlock(&lp->lp_lock);
429 spin_unlock(&lp->lp_lock);
431 if (lp_state & LNET_PEER_PING_FAILED ||
432 pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
433 CDEBUG(D_NET, "Set routes down for gw %s because %s %d\n",
434 libcfs_nid2str(lp->lp_primary_nid),
435 lp_state & LNET_PEER_PING_FAILED ? "ping failed" :
436 "route feature is disabled", lp->lp_ping_error);
437 /* If the ping failed or the peer has routing disabled then
438 * mark the routes served by this peer down
440 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
441 lnet_set_route_aliveness(route, false);
445 CDEBUG(D_NET, "Discovery is disabled. Processing reply for gw: %s:%d\n",
446 libcfs_nid2str(lp->lp_primary_nid), pbuf->pb_info.pi_nnis);
449 * examine the ping response to determine if the routes on that
450 * gateway should be declared alive.
451 * The route is alive if:
452 * 1. local network to reach the route is alive and
453 * 2. route is single hop, avoid_async_router_failure is set and
454 * there exists at least one NI on the route's remote net
456 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
457 llpn = lnet_peer_get_net_locked(lp, route->lr_lnet);
459 lnet_set_route_aliveness(route, false);
463 if (!lnet_is_gateway_net_alive(llpn)) {
464 lnet_set_route_aliveness(route, false);
468 single_hop = net_up = false;
469 for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
470 net = LNET_NIDNET(pbuf->pb_info.pi_ni[i].ns_nid);
472 if (route->lr_net == net) {
474 if (pbuf->pb_info.pi_ni[i].ns_status ==
482 route->lr_single_hop = single_hop;
483 if (avoid_asym_router_failure &&
484 (route->lr_hops == 1 ||
485 route->lr_hops == LNET_UNDEFINED_HOPS))
486 lnet_set_route_aliveness(route, net_up);
488 lnet_set_route_aliveness(route, true);
491 * warn that the route is configured as single-hop but it
492 * really is multi-hop as far as we can tell.
494 lnet_check_route_inconsistency(route);
499 lnet_router_discovery_complete(struct lnet_peer *lp)
501 struct lnet_peer_ni *lpni = NULL;
502 struct lnet_route *route;
504 spin_lock(&lp->lp_lock);
505 lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
506 lp->lp_state |= LNET_PEER_RTR_DISCOVERED;
507 lp->lp_alive = lp->lp_dc_error == 0;
508 spin_unlock(&lp->lp_lock);
510 if (!lp->lp_dc_error) {
511 /* ping replies are being handled when discovery is disabled */
512 if (lnet_is_discovery_disabled_locked(lp))
516 * mark single-hop routes. If the remote net is not configured on
517 * the gateway we assume this is intentional and we mark the
518 * gateway as multi-hop
520 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
521 lnet_set_route_aliveness(route, true);
522 lnet_set_route_hop_type(lp, route);
529 * We do not send messages directly to the remote interfaces
530 * of an LNet router. As such, we rely on the PING response
531 * to determine the up/down status of these interfaces. If
532 * a PING response is not receieved, or some other problem with
533 * discovery occurs that prevents us from getting this status,
534 * we assume all interfaces are down until we're able to
535 * determine otherwise.
537 CDEBUG(D_NET, "%s: Router discovery failed %d\n",
538 libcfs_nid2str(lp->lp_primary_nid), lp->lp_dc_error);
539 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
540 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
542 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
543 lnet_set_route_aliveness(route, false);
547 lnet_rtr_addref_locked(struct lnet_peer *lp)
549 LASSERT(lp->lp_rtr_refcount >= 0);
551 /* lnet_net_lock must be exclusively locked */
552 lp->lp_rtr_refcount++;
553 if (lp->lp_rtr_refcount == 1) {
554 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
555 /* addref for the_lnet.ln_routers */
556 lnet_peer_addref_locked(lp);
557 the_lnet.ln_routers_version++;
562 lnet_rtr_decref_locked(struct lnet_peer *lp)
564 LASSERT(atomic_read(&lp->lp_refcount) > 0);
565 LASSERT(lp->lp_rtr_refcount > 0);
567 /* lnet_net_lock must be exclusively locked */
568 lp->lp_rtr_refcount--;
569 if (lp->lp_rtr_refcount == 0) {
570 LASSERT(list_empty(&lp->lp_routes));
572 list_del(&lp->lp_rtr_list);
573 /* decref for the_lnet.ln_routers */
574 lnet_peer_decref_locked(lp);
575 the_lnet.ln_routers_version++;
579 struct lnet_remotenet *
580 lnet_find_rnet_locked(__u32 net)
582 struct lnet_remotenet *rnet;
583 struct list_head *tmp;
584 struct list_head *rn_list;
586 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
588 rn_list = lnet_net2rnethash(net);
589 list_for_each(tmp, rn_list) {
590 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
592 if (rnet->lrn_net == net)
598 static void lnet_shuffle_seed(void)
601 struct lnet_ni *ni = NULL;
606 /* Nodes with small feet have little entropy
607 * the NID for this node gives the most entropy in the low bits */
608 while ((ni = lnet_get_next_ni_locked(NULL, ni)))
609 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
614 /* NB expects LNET_LOCK held */
616 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
618 struct lnet_peer_net *lpn;
619 unsigned int offset = 0;
620 unsigned int len = 0;
626 list_for_each(e, &rnet->lrn_routes)
630 * Randomly adding routes to the list is done to ensure that when
631 * different nodes are using the same list of routers, they end up
632 * preferring different routers.
634 offset = prandom_u32_max(len + 1);
635 list_for_each(e, &rnet->lrn_routes) {
640 list_add(&route->lr_list, e);
642 * force a router check on the gateway to make sure the route is
645 now = ktime_get_real_seconds();
646 list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
648 lpn->lpn_next_ping = now;
651 the_lnet.ln_remote_nets_version++;
653 /* add the route on the gateway list */
654 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
656 /* take a router reference count on the gateway */
657 lnet_rtr_addref_locked(route->lr_gateway);
661 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
662 __u32 priority, __u32 sensitivity)
664 struct list_head *route_entry;
665 struct lnet_remotenet *rnet;
666 struct lnet_remotenet *rnet2;
667 struct lnet_route *route;
668 struct lnet_peer_ni *lpni;
669 struct lnet_peer *gw;
673 CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
674 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
676 if (gateway == LNET_NID_ANY ||
677 gateway == LNET_NID_LO_0 ||
678 net == LNET_NET_ANY ||
679 LNET_NETTYP(net) == LOLND ||
680 LNET_NIDNET(gateway) == net ||
681 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
684 /* it's a local network */
685 if (lnet_islocalnet(net))
688 if (!lnet_islocalnet(LNET_NIDNET(gateway))) {
689 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
690 libcfs_nid2str(gateway),
691 libcfs_net2str(LNET_NIDNET(gateway)));
692 return -EHOSTUNREACH;
695 /* Assume net, route, all new */
696 LIBCFS_ALLOC(route, sizeof(*route));
697 LIBCFS_ALLOC(rnet, sizeof(*rnet));
698 if (route == NULL || rnet == NULL) {
699 CERROR("Out of memory creating route %s %d %s\n",
700 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
702 LIBCFS_FREE(route, sizeof(*route));
704 LIBCFS_FREE(rnet, sizeof(*rnet));
708 INIT_LIST_HEAD(&rnet->lrn_routes);
710 /* store the local and remote net that the route represents */
711 route->lr_lnet = LNET_NIDNET(gateway);
713 route->lr_nid = gateway;
714 route->lr_priority = priority;
715 route->lr_hops = hops;
716 if (lnet_peers_start_down())
717 atomic_set(&route->lr_alive, 0);
719 atomic_set(&route->lr_alive, 1);
721 lnet_net_lock(LNET_LOCK_EX);
724 * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
725 * lose that once we're done
727 lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
729 lnet_net_unlock(LNET_LOCK_EX);
731 LIBCFS_FREE(route, sizeof(*route));
732 LIBCFS_FREE(rnet, sizeof(*rnet));
735 CERROR("Error %d creating route %s %d %s\n", rc,
736 libcfs_net2str(net), hops,
737 libcfs_nid2str(gateway));
741 LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
742 gw = lpni->lpni_peer_net->lpn_peer;
744 route->lr_gateway = gw;
746 rnet2 = lnet_find_rnet_locked(net);
749 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
753 /* Search for a duplicate route (it's a NOOP if it is) */
755 list_for_each(route_entry, &rnet2->lrn_routes) {
756 struct lnet_route *route2;
758 route2 = list_entry(route_entry, struct lnet_route, lr_list);
759 if (route2->lr_gateway == route->lr_gateway) {
764 /* our lookups must be true */
765 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
769 * It is possible to add multiple routes through the same peer,
770 * but it'll be using a different NID of that peer. When the
771 * gateway is discovered, discovery will consolidate the different
772 * peers into one peer. In this case the discovery code will have
773 * to move the routes from the peer that's being deleted to the
774 * consolidated peer lp_routes list
777 gw->lp_health_sensitivity = sensitivity;
778 lnet_add_route_to_rnet(rnet2, route);
779 if (lnet_peer_discovery_disabled)
780 CWARN("Consider turning discovery on to enable full "
781 "Multi-Rail routing functionality\n");
785 * get rid of the reference on the lpni.
787 lnet_peer_ni_decref_locked(lpni);
788 lnet_net_unlock(LNET_LOCK_EX);
794 LIBCFS_FREE(route, sizeof(*route));
798 LIBCFS_FREE(rnet, sizeof(*rnet));
800 /* kick start the monitor thread to handle the added route */
801 complete(&the_lnet.ln_mt_wait_complete);
807 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
808 struct list_head *zombies)
810 struct lnet_peer *gateway;
811 struct lnet_route *route;
812 struct lnet_route *tmp;
814 list_for_each_entry_safe(route, tmp, route_list, lr_list) {
815 gateway = route->lr_gateway;
816 if (gw_nid != LNET_NID_ANY &&
817 gw_nid != gateway->lp_primary_nid)
821 * move to zombie to delete outside the lock
822 * Note that this function is called with the
823 * ln_api_mutex held as well as the exclusive net
824 * lock. Adding to the remote net list happens
825 * under the same conditions. Same goes for the
826 * gateway router list
828 list_move(&route->lr_list, zombies);
829 the_lnet.ln_remote_nets_version++;
831 list_del(&route->lr_gwlist);
832 lnet_rtr_decref_locked(gateway);
837 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
839 LIST_HEAD(rnet_zombies);
840 struct lnet_remotenet *rnet;
841 struct lnet_remotenet *tmp;
842 struct list_head *rn_list;
843 struct lnet_peer_ni *lpni;
844 struct lnet_route *route;
846 struct lnet_peer *lp = NULL;
849 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
850 libcfs_net2str(net), libcfs_nid2str(gw_nid));
852 /* NB Caller may specify either all routes via the given gateway
853 * or a specific route entry actual NIDs) */
855 lnet_net_lock(LNET_LOCK_EX);
857 lpni = lnet_find_peer_ni_locked(gw_nid);
859 lp = lpni->lpni_peer_net->lpn_peer;
861 gw_nid = lp->lp_primary_nid;
862 lnet_peer_ni_decref_locked(lpni);
865 if (net != LNET_NET_ANY) {
866 rnet = lnet_find_rnet_locked(net);
868 lnet_net_unlock(LNET_LOCK_EX);
871 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
873 if (list_empty(&rnet->lrn_routes))
874 list_move(&rnet->lrn_list, &rnet_zombies);
878 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
879 rn_list = &the_lnet.ln_remote_nets_hash[i];
881 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
882 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
884 if (list_empty(&rnet->lrn_routes))
885 list_move(&rnet->lrn_list, &rnet_zombies);
891 * check if there are any routes remaining on the gateway
892 * If there are no more routes make sure to set the peer's
893 * lp_disc_net_id to 0 (invalid), in case we add more routes in
894 * the future on that gateway, then we start our discovery process
898 if (list_empty(&lp->lp_routes))
899 lp->lp_disc_net_id = 0;
902 lnet_net_unlock(LNET_LOCK_EX);
904 while (!list_empty(&zombies)) {
905 route = list_first_entry(&zombies, struct lnet_route, lr_list);
906 list_del(&route->lr_list);
907 LIBCFS_FREE(route, sizeof(*route));
910 while (!list_empty(&rnet_zombies)) {
911 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
913 list_del(&rnet->lrn_list);
914 LIBCFS_FREE(rnet, sizeof(*rnet));
921 lnet_destroy_routes (void)
923 lnet_del_route(LNET_NET_ANY, LNET_NID_ANY);
926 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
928 struct lnet_rtrbufpool *rbp;
929 int i, rc = -ENOENT, j;
931 if (the_lnet.ln_rtrpools == NULL)
935 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
940 for (j = 0; j < LNET_NRBPOOLS; j++) {
941 pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
942 pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
943 pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
944 pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
951 lnet_net_lock(LNET_LOCK_EX);
952 pool_cfg->pl_routing = the_lnet.ln_routing;
953 lnet_net_unlock(LNET_LOCK_EX);
959 lnet_get_route(int idx, __u32 *net, __u32 *hops,
960 lnet_nid_t *gateway, __u32 *flags, __u32 *priority, __u32 *sensitivity)
962 struct lnet_remotenet *rnet;
963 struct list_head *rn_list;
964 struct lnet_route *route;
965 struct list_head *e1;
966 struct list_head *e2;
970 cpt = lnet_net_lock_current();
972 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
973 rn_list = &the_lnet.ln_remote_nets_hash[i];
974 list_for_each(e1, rn_list) {
975 rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
977 list_for_each(e2, &rnet->lrn_routes) {
978 route = list_entry(e2, struct lnet_route,
982 *net = rnet->lrn_net;
983 *gateway = route->lr_nid;
984 *hops = route->lr_hops;
985 *priority = route->lr_priority;
986 *sensitivity = route->lr_gateway->
987 lp_health_sensitivity;
988 if (lnet_is_route_alive(route))
989 *flags |= LNET_RT_ALIVE;
991 *flags &= ~LNET_RT_ALIVE;
992 if (route->lr_single_hop)
993 *flags &= ~LNET_RT_MULTI_HOP;
995 *flags |= LNET_RT_MULTI_HOP;
996 lnet_net_unlock(cpt);
1003 lnet_net_unlock(cpt);
1008 lnet_wait_known_routerstate(void)
1010 struct lnet_peer *rtr;
1011 struct list_head *entry;
1014 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
1017 int cpt = lnet_net_lock_current();
1020 list_for_each(entry, &the_lnet.ln_routers) {
1021 rtr = list_entry(entry, struct lnet_peer,
1024 spin_lock(&rtr->lp_lock);
1026 if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
1028 spin_unlock(&rtr->lp_lock);
1031 spin_unlock(&rtr->lp_lock);
1034 lnet_net_unlock(cpt);
1039 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1044 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
1047 bool update = false;
1049 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1050 if (lnet_ni_set_status(ni, status))
1057 lnet_update_ni_status_locked(void)
1059 struct lnet_net *net;
1065 LASSERT(the_lnet.ln_routing);
1067 timeout = router_ping_timeout + alive_router_check_interval;
1069 now = ktime_get_real_seconds();
1070 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1071 if (net->net_lnd->lnd_type == LOLND)
1074 if (now < net->net_last_alive + timeout)
1075 goto check_ni_fatal;
1077 spin_lock(&net->net_lock);
1078 /* re-check with lock */
1079 if (now < net->net_last_alive + timeout) {
1080 spin_unlock(&net->net_lock);
1081 goto check_ni_fatal;
1083 spin_unlock(&net->net_lock);
1086 * if the net didn't receive any traffic for past the
1087 * timeout on any of its constituent NIs, then mark all
1090 if (lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN)) {
1096 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1097 /* lnet_ni_set_status() will perform the same check of
1098 * ni_status while holding the ni lock. We can safely
1099 * check ni_status without that lock because it is only
1100 * written to under net_lock/EX and our caller is
1101 * holding a net lock.
1103 if (atomic_read(&ni->ni_fatal_error_on) &&
1105 ni->ni_status->ns_status != LNET_NI_STATUS_DOWN &&
1106 lnet_ni_set_status(ni, LNET_NI_STATUS_DOWN))
1114 void lnet_wait_router_start(void)
1116 if (check_routers_before_use) {
1117 /* Note that a helpful side-effect of pinging all known routers
1118 * at startup is that it makes them drop stale connections they
1119 * may have to a previous instance of me. */
1120 lnet_wait_known_routerstate();
1125 * This function is called from the monitor thread to check if there are
1126 * any active routers that need to be checked.
1128 bool lnet_router_checker_active(void)
1130 /* Router Checker thread needs to run when routing is enabled in
1131 * order to call lnet_update_ni_status_locked() */
1132 if (the_lnet.ln_routing)
1135 return !list_empty(&the_lnet.ln_routers) &&
1136 alive_router_check_interval > 0;
1140 lnet_check_routers(void)
1142 struct lnet_peer_net *first_lpn;
1143 struct lnet_peer_net *lpn;
1144 struct lnet_peer_ni *lpni;
1145 struct list_head *entry;
1146 struct lnet_peer *rtr;
1156 cpt = lnet_net_lock_current();
1158 version = the_lnet.ln_routers_version;
1160 list_for_each(entry, &the_lnet.ln_routers) {
1161 rtr = list_entry(entry, struct lnet_peer,
1164 /* If we're currently discovering the peer then don't
1165 * issue another discovery
1167 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY)
1170 now = ktime_get_real_seconds();
1172 /* find the next local peer net which needs to be ping'd */
1176 net_id = rtr->lp_disc_net_id;
1178 lpn = lnet_get_next_peer_net_locked(rtr, net_id);
1180 CERROR("gateway %s has no networks\n",
1181 libcfs_nid2str(rtr->lp_primary_nid));
1185 /* We looped back to the first peer net */
1186 if (first_lpn == lpn)
1191 net_id = lpn->lpn_net_id;
1192 if (!lnet_islocalnet_locked(net_id))
1197 CDEBUG(D_NET, "rtr %s(%p) %s(%p) next ping %lld\n",
1198 libcfs_nid2str(rtr->lp_primary_nid), rtr,
1199 libcfs_net2str(net_id), lpn,
1200 lpn->lpn_next_ping);
1202 needs_ping = now >= lpn->lpn_next_ping;
1204 } while (!needs_ping);
1206 if (!found_lpn || !lpn) {
1207 CERROR("no local network found for gateway %s\n",
1208 libcfs_nid2str(rtr->lp_primary_nid));
1215 spin_lock(&rtr->lp_lock);
1216 /* make sure we fully discover the router */
1217 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1218 rtr->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH |
1219 LNET_PEER_RTR_DISCOVERY;
1220 spin_unlock(&rtr->lp_lock);
1222 /* find the peer_ni associated with the primary NID */
1223 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
1225 CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
1226 libcfs_nid2str(rtr->lp_primary_nid));
1229 lnet_peer_ni_addref_locked(lpni);
1231 /* specify the net to use */
1232 rtr->lp_disc_net_id = lpn->lpn_net_id;
1234 /* discover the router */
1235 CDEBUG(D_NET, "discover %s, cpt = %d\n",
1236 libcfs_nid2str(lpni->lpni_nid), cpt);
1237 rc = lnet_discover_peer_locked(lpni, cpt, false);
1239 /* drop ref taken above */
1240 lnet_peer_ni_decref_locked(lpni);
1243 lpn->lpn_next_ping = now + alive_router_check_interval;
1245 CERROR("Failed to discover router %s\n",
1246 libcfs_nid2str(rtr->lp_primary_nid));
1248 /* NB cpt lock was dropped in lnet_discover_peer_locked() */
1249 if (version != the_lnet.ln_routers_version) {
1250 /* the routers list has changed */
1255 if (the_lnet.ln_routing)
1256 push = lnet_update_ni_status_locked();
1258 lnet_net_unlock(cpt);
1260 /* if the status of the ni changed update the peers */
1262 lnet_push_update_to_peers(1);
1266 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1268 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1270 while (--npages >= 0)
1271 __free_page(rb->rb_kiov[npages].bv_page);
1273 LIBCFS_FREE(rb, sz);
1276 static struct lnet_rtrbuf *
1277 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1279 int npages = rbp->rbp_npages;
1280 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1282 struct lnet_rtrbuf *rb;
1285 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1291 for (i = 0; i < npages; i++) {
1292 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1293 GFP_KERNEL | __GFP_ZERO);
1296 __free_page(rb->rb_kiov[i].bv_page);
1298 LIBCFS_FREE(rb, sz);
1302 rb->rb_kiov[i].bv_len = PAGE_SIZE;
1303 rb->rb_kiov[i].bv_offset = 0;
1304 rb->rb_kiov[i].bv_page = page;
1311 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1313 int npages = rbp->rbp_npages;
1314 struct lnet_rtrbuf *rb;
1317 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1321 list_splice_init(&rbp->rbp_msgs, &tmp);
1322 lnet_drop_routed_msgs_locked(&tmp, cpt);
1323 list_splice_init(&rbp->rbp_bufs, &tmp);
1324 rbp->rbp_req_nbuffers = 0;
1325 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1326 rbp->rbp_mincredits = 0;
1327 lnet_net_unlock(cpt);
1329 /* Free buffers on the free list. */
1330 while (!list_empty(&tmp)) {
1331 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1332 list_del(&rb->rb_list);
1333 lnet_destroy_rtrbuf(rb, npages);
1338 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1341 struct lnet_rtrbuf *rb;
1343 int num_buffers = 0;
1345 int npages = rbp->rbp_npages;
1348 /* If we are called for less buffers than already in the pool, we
1349 * just lower the req_nbuffers number and excess buffers will be
1350 * thrown away as they are returned to the free list. Credits
1351 * then get adjusted as well.
1352 * If we already have enough buffers allocated to serve the
1353 * increase requested, then we can treat that the same way as we
1354 * do the decrease. */
1355 num_rb = nbufs - rbp->rbp_nbuffers;
1356 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1357 rbp->rbp_req_nbuffers = nbufs;
1358 lnet_net_unlock(cpt);
1361 /* store the older value of rbp_req_nbuffers and then set it to
1362 * the new request to prevent lnet_return_rx_credits_locked() from
1363 * freeing buffers that we need to keep around */
1364 old_req_nbufs = rbp->rbp_req_nbuffers;
1365 rbp->rbp_req_nbuffers = nbufs;
1366 lnet_net_unlock(cpt);
1368 /* allocate the buffers on a local list first. If all buffers are
1369 * allocated successfully then join this list to the rbp buffer
1370 * list. If not then free all allocated buffers. */
1371 while (num_rb-- > 0) {
1372 rb = lnet_new_rtrbuf(rbp, cpt);
1374 CERROR("Failed to allocate %d route bufs of %d pages\n",
1378 rbp->rbp_req_nbuffers = old_req_nbufs;
1379 lnet_net_unlock(cpt);
1384 list_add(&rb->rb_list, &rb_list);
1390 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1391 rbp->rbp_nbuffers += num_buffers;
1392 rbp->rbp_credits += num_buffers;
1393 rbp->rbp_mincredits = rbp->rbp_credits;
1394 /* We need to schedule blocked msg using the newly
1396 while (!list_empty(&rbp->rbp_bufs) &&
1397 !list_empty(&rbp->rbp_msgs))
1398 lnet_schedule_blocked_locked(rbp);
1400 lnet_net_unlock(cpt);
1405 while (!list_empty(&rb_list)) {
1406 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1407 list_del(&rb->rb_list);
1408 lnet_destroy_rtrbuf(rb, npages);
1415 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1417 INIT_LIST_HEAD(&rbp->rbp_msgs);
1418 INIT_LIST_HEAD(&rbp->rbp_bufs);
1420 rbp->rbp_npages = npages;
1421 rbp->rbp_credits = 0;
1422 rbp->rbp_mincredits = 0;
1426 lnet_rtrpools_free(int keep_pools)
1428 struct lnet_rtrbufpool *rtrp;
1431 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1434 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1435 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1436 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1437 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1441 cfs_percpt_free(the_lnet.ln_rtrpools);
1442 the_lnet.ln_rtrpools = NULL;
1447 lnet_nrb_tiny_calculate(void)
1449 int nrbs = LNET_NRB_TINY;
1451 if (tiny_router_buffers < 0) {
1452 LCONSOLE_ERROR_MSG(0x10c,
1453 "tiny_router_buffers=%d invalid when "
1454 "routing enabled\n", tiny_router_buffers);
1458 if (tiny_router_buffers > 0)
1459 nrbs = tiny_router_buffers;
1461 nrbs /= LNET_CPT_NUMBER;
1462 return max(nrbs, LNET_NRB_TINY_MIN);
1466 lnet_nrb_small_calculate(void)
1468 int nrbs = LNET_NRB_SMALL;
1470 if (small_router_buffers < 0) {
1471 LCONSOLE_ERROR_MSG(0x10c,
1472 "small_router_buffers=%d invalid when "
1473 "routing enabled\n", small_router_buffers);
1477 if (small_router_buffers > 0)
1478 nrbs = small_router_buffers;
1480 nrbs /= LNET_CPT_NUMBER;
1481 return max(nrbs, LNET_NRB_SMALL_MIN);
1485 lnet_nrb_large_calculate(void)
1487 int nrbs = LNET_NRB_LARGE;
1489 if (large_router_buffers < 0) {
1490 LCONSOLE_ERROR_MSG(0x10c,
1491 "large_router_buffers=%d invalid when "
1492 "routing enabled\n", large_router_buffers);
1496 if (large_router_buffers > 0)
1497 nrbs = large_router_buffers;
1499 nrbs /= LNET_CPT_NUMBER;
1500 return max(nrbs, LNET_NRB_LARGE_MIN);
1504 lnet_rtrpools_alloc(int im_a_router)
1506 struct lnet_rtrbufpool *rtrp;
1513 if (!strcmp(forwarding, "")) {
1514 /* not set either way */
1517 } else if (!strcmp(forwarding, "disabled")) {
1518 /* explicitly disabled */
1520 } else if (!strcmp(forwarding, "enabled")) {
1521 /* explicitly enabled */
1523 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1524 "'enabled' or 'disabled'\n");
1528 nrb_tiny = lnet_nrb_tiny_calculate();
1532 nrb_small = lnet_nrb_small_calculate();
1536 nrb_large = lnet_nrb_large_calculate();
1540 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1542 sizeof(struct lnet_rtrbufpool));
1543 if (the_lnet.ln_rtrpools == NULL) {
1544 LCONSOLE_ERROR_MSG(0x10c,
1545 "Failed to initialize router buffe pool\n");
1549 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1550 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1551 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1556 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1557 LNET_NRB_SMALL_PAGES);
1558 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1563 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1564 LNET_NRB_LARGE_PAGES);
1565 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1571 lnet_net_lock(LNET_LOCK_EX);
1572 the_lnet.ln_routing = 1;
1573 lnet_net_unlock(LNET_LOCK_EX);
1574 complete(&the_lnet.ln_mt_wait_complete);
1578 lnet_rtrpools_free(0);
1583 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1588 struct lnet_rtrbufpool *rtrp;
1590 /* If the provided values for each buffer pool are different than the
1591 * configured values, we need to take action. */
1593 tiny_router_buffers = tiny;
1594 nrb = lnet_nrb_tiny_calculate();
1595 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1596 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1603 small_router_buffers = small;
1604 nrb = lnet_nrb_small_calculate();
1605 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1606 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1613 large_router_buffers = large;
1614 nrb = lnet_nrb_large_calculate();
1615 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1616 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1627 lnet_rtrpools_adjust(int tiny, int small, int large)
1629 /* this function doesn't revert the changes if adding new buffers
1630 * failed. It's up to the user space caller to revert the
1633 if (!the_lnet.ln_routing)
1636 return lnet_rtrpools_adjust_helper(tiny, small, large);
1640 lnet_rtrpools_enable(void)
1644 if (the_lnet.ln_routing)
1647 if (the_lnet.ln_rtrpools == NULL)
1648 /* If routing is turned off, and we have never
1649 * initialized the pools before, just call the
1650 * standard buffer pool allocation routine as
1651 * if we are just configuring this for the first
1653 rc = lnet_rtrpools_alloc(1);
1655 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1659 lnet_net_lock(LNET_LOCK_EX);
1660 the_lnet.ln_routing = 1;
1662 the_lnet.ln_ping_target->pb_info.pi_features &=
1663 ~LNET_PING_FEAT_RTE_DISABLED;
1664 lnet_net_unlock(LNET_LOCK_EX);
1666 if (lnet_peer_discovery_disabled)
1667 CWARN("Consider turning discovery on to enable full "
1668 "Multi-Rail routing functionality\n");
1674 lnet_rtrpools_disable(void)
1676 if (!the_lnet.ln_routing)
1679 lnet_net_lock(LNET_LOCK_EX);
1680 the_lnet.ln_routing = 0;
1681 the_lnet.ln_ping_target->pb_info.pi_features |=
1682 LNET_PING_FEAT_RTE_DISABLED;
1684 tiny_router_buffers = 0;
1685 small_router_buffers = 0;
1686 large_router_buffers = 0;
1687 lnet_net_unlock(LNET_LOCK_EX);
1688 lnet_rtrpools_free(1);
1692 lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid)
1694 if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1695 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1699 * ni: local NI used to communicate with the peer
1701 * alive: true if peer is alive, false otherwise
1702 * reset: reset health value. This is requested by the LND.
1703 * when: notificaiton time.
1706 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
1709 struct lnet_peer_ni *lpni = NULL;
1710 struct lnet_route *route;
1711 struct lnet_peer *lp;
1712 time64_t now = ktime_get_seconds();
1715 LASSERT(!in_interrupt());
1717 CDEBUG(D_NET, "%s notifying %s: %s\n",
1718 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1719 libcfs_nid2str(nid), alive ? "up" : "down");
1722 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1723 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1724 libcfs_nid2str(nid), alive ? "birth" : "death",
1725 libcfs_nid2str(ni->ni_nid));
1729 /* can't do predictions... */
1731 CWARN("Ignoring prediction from %s of %s %s "
1732 "%lld seconds in the future\n",
1733 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1734 libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1738 if (ni != NULL && !alive && /* LND telling me she's down */
1739 !auto_down) { /* auto-down disabled */
1740 CDEBUG(D_NET, "Auto-down disabled\n");
1744 /* must lock 0 since this is used for synchronization */
1747 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1752 lpni = lnet_find_peer_ni_locked(nid);
1756 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1762 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
1763 lnet_set_lpni_healthv_locked(lpni,
1764 LNET_MAX_HEALTH_VALUE);
1766 __u32 sensitivity = lpni->lpni_peer_net->
1767 lpn_peer->lp_health_sensitivity;
1769 lnet_inc_lpni_healthv_locked(lpni,
1770 (sensitivity) ? sensitivity :
1771 lnet_health_sensitivity);
1774 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
1777 /* recalculate aliveness */
1778 alive = lnet_is_peer_ni_alive(lpni);
1780 lp = lpni->lpni_peer_net->lpn_peer;
1781 /* If this is an LNet router then update route aliveness */
1782 if (lp->lp_rtr_refcount) {
1784 /* reset flag indicates gateway peer went up or down */
1785 lp->lp_alive = alive;
1787 /* If discovery is disabled, locally or on the gateway, then
1788 * any routes using lpni as next-hop need to be updated
1790 * NB: We can get many notifications while a route is down, so
1791 * we try and avoid the expensive net_lock/EX here for the
1792 * common case of receiving duplicate lnet_notify() calls (i.e.
1793 * only grab EX lock when we actually need to update the route
1796 if (lnet_is_discovery_disabled(lp)) {
1797 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
1798 if (route->lr_nid == lpni->lpni_nid)
1799 lnet_set_route_aliveness(route, alive);
1806 if (ni != NULL && !alive)
1807 lnet_notify_peer_down(ni, lpni->lpni_nid);
1809 cpt = lpni->lpni_cpt;
1811 lnet_peer_ni_decref_locked(lpni);
1812 lnet_net_unlock(cpt);
1816 EXPORT_SYMBOL(lnet_notify);