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(struct lnet_nid *gw_nid,
124 struct list_head *route_list,
125 struct list_head *zombies);
128 rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
131 unsigned *sen = (unsigned *)kp->arg;
134 rc = kstrtoul(val, 0, &value);
136 CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
140 if (value < 0 || value > 100) {
141 CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
146 * The purpose of locking the api_mutex here is to ensure that
147 * the correct value ends up stored properly.
149 mutex_lock(&the_lnet.ln_api_mutex);
153 mutex_unlock(&the_lnet.ln_api_mutex);
159 lnet_move_route(struct lnet_route *route, struct lnet_peer *lp,
160 struct list_head *rt_list)
161 __must_hold(&the_lnet.ln_api_mutex)
163 struct lnet_remotenet *rnet;
164 struct list_head zombies;
167 INIT_LIST_HEAD(&zombies);
174 rnet = lnet_find_rnet_locked(route->lr_net);
177 CDEBUG(D_NET, "deleting route %s->%s\n",
178 libcfs_net2str(route->lr_net),
179 libcfs_nidstr(&route->lr_nid));
182 * use the gateway's lp_primary_nid to delete the route as the
183 * lr_nid can be a constituent NID of the peer
185 lnet_del_route_from_rnet(
186 &route->lr_gateway->lp_primary_nid,
187 &rnet->lrn_routes, l);
190 route = list_first_entry(l, struct lnet_route,
192 route->lr_gateway = lp;
193 lnet_add_route_to_rnet(rnet, route);
195 while (!list_empty(l) && !rt_list) {
196 route = list_first_entry(l, struct lnet_route,
198 list_del(&route->lr_list);
199 LIBCFS_FREE(route, sizeof(*route));
205 lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target)
207 struct lnet_route *route;
208 struct lnet_route *tmp, *tmp2;
210 lnet_net_lock(LNET_LOCK_EX);
211 CDEBUG(D_NET, "transfering routes from %s -> %s\n",
212 libcfs_nidstr(&src->lp_primary_nid),
213 libcfs_nidstr(&target->lp_primary_nid));
214 list_for_each_entry(route, &src->lp_routes, lr_gwlist) {
215 CDEBUG(D_NET, "%s: %s->%s\n",
216 libcfs_nidstr(&src->lp_primary_nid),
217 libcfs_net2str(route->lr_net),
218 libcfs_nidstr(&route->lr_nid));
220 list_splice_init(&src->lp_rtrq, &target->lp_rtrq);
221 list_for_each_entry_safe(route, tmp, &src->lp_routes, lr_gwlist) {
222 struct lnet_route *r2;
223 bool present = false;
224 list_for_each_entry_safe(r2, tmp2, &target->lp_routes, lr_gwlist) {
225 if (route->lr_net == r2->lr_net) {
226 if (route->lr_priority >= r2->lr_priority)
228 else if (route->lr_hops >= r2->lr_hops)
231 lnet_move_route(r2, NULL, NULL);
235 lnet_move_route(route, NULL, NULL);
237 lnet_move_route(route, target, NULL);
240 if (list_empty(&target->lp_rtr_list)) {
241 lnet_peer_addref_locked(target);
242 list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers);
245 the_lnet.ln_routers_version++;
246 lnet_net_unlock(LNET_LOCK_EX);
250 lnet_peers_start_down(void)
252 return check_routers_before_use;
256 * The peer_net of a gateway is alive if at least one of the peer_ni's on
257 * that peer_net is alive.
260 lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
262 struct lnet_peer_ni *lpni;
264 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
265 if (lnet_is_peer_ni_alive(lpni))
273 * a gateway is alive only if all its nets are alive
274 * called with cpt lock held
276 bool lnet_is_gateway_alive(struct lnet_peer *gw)
278 struct lnet_peer_net *lpn;
283 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
284 if (!lnet_is_gateway_net_alive(lpn))
292 * lnet_is_route_alive() needs to be called with cpt lock held
293 * A route is alive if the gateway can route between the local network and
294 * the remote network of the route.
295 * This means at least one NI is alive on each of the local and remote
296 * networks of the gateway.
298 bool lnet_is_route_alive(struct lnet_route *route)
300 struct lnet_peer *gw = route->lr_gateway;
301 struct lnet_peer_net *llpn;
302 struct lnet_peer_net *rlpn;
304 /* If the gateway is down then all routes are considered down */
309 * if discovery is disabled then rely on the cached aliveness
310 * information. This is handicapped information which we log when
311 * we receive the discovery ping response. The most uptodate
312 * aliveness information can only be obtained when discovery is
315 if (lnet_is_discovery_disabled(gw))
316 return atomic_read(&route->lr_alive) == 1;
319 * check the gateway's interfaces on the local network
321 llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
325 if (!lnet_is_gateway_net_alive(llpn))
329 * For single hop routes avoid_asym_router_failure dictates
330 * that the remote net must exist on the gateway. For multi-hop
331 * routes the next-hop will not have the remote net.
333 if (avoid_asym_router_failure &&
334 (route->lr_hops == 1 || route->lr_single_hop)) {
335 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
338 if (!lnet_is_gateway_net_alive(rlpn))
342 spin_lock(&gw->lp_lock);
343 if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
344 spin_unlock(&gw->lp_lock);
345 if (gw->lp_rtr_refcount > 0)
346 CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
347 libcfs_nidstr(&gw->lp_primary_nid));
350 spin_unlock(&gw->lp_lock);
356 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
357 struct lnet_peer *new_lp)
359 struct lnet_peer_ni *lpni;
360 struct lnet_route *route;
363 * Although a route is correlated with a peer, but when it's added
364 * a specific NID is used. That NID refers to a peer_ni within
365 * a peer. There could be other peer_nis on the same net, which
366 * can be used to send to that gateway. However when we are
367 * consolidating gateways because of discovery, the nid used to
368 * add the route might've moved between gateway peers. In this
369 * case we want to move the route to the new gateway as well. The
370 * intent here is not to confuse the user who added the route.
372 list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
373 lpni = lnet_peer_ni_get_locked(orig_lp, &route->lr_nid);
375 lnet_net_lock(LNET_LOCK_EX);
376 list_move(&route->lr_gwlist, &new_lp->lp_routes);
377 lnet_net_unlock(LNET_LOCK_EX);
383 lnet_check_route_inconsistency(struct lnet_route *route)
385 if (!route->lr_single_hop && route->lr_hops == 1 &&
386 avoid_asym_router_failure) {
387 CWARN("route %s->%s is detected to be multi-hop but hop count is set to %d\n",
388 libcfs_net2str(route->lr_net),
389 libcfs_nidstr(&route->lr_gateway->lp_primary_nid),
390 (int) route->lr_hops);
394 /* Routes are added and removed under both ln_api_mutex and net_lock/EX
395 * Since we are not modifying anything we simply require the ln_api_mutex be
396 * held so that things are not modified underneath us
399 lnet_router_discovery_ping_reply(struct lnet_peer *lp,
400 struct lnet_ping_buffer *pbuf)
401 __must_hold(&the_lnet.ln_api_mutex)
403 struct lnet_ping_iter piter;
404 struct lnet_peer_net *llpn;
405 struct lnet_route *route;
407 bool single_hop = false;
411 if (pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
412 CERROR("Peer %s is being used as a gateway but routing feature is not turned on\n",
413 libcfs_nidstr(&lp->lp_primary_nid));
414 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
415 lnet_set_route_aliveness(route, false);
419 CDEBUG(D_NET, "Processing reply for gw: %s nnis %d\n",
420 libcfs_nidstr(&lp->lp_primary_nid), pbuf->pb_info.pi_nnis);
422 /* examine the ping response to determine if the routes on that
423 * gateway should be declared alive.
424 * The route is alive if:
425 * 1. local network to reach the route is alive and
426 * 2. route is single hop, avoid_async_router_failure is set and
427 * there exists at least one NI on the route's remote net
429 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
430 llpn = lnet_peer_get_net_locked(lp, route->lr_lnet);
432 lnet_set_route_aliveness(route, false);
436 if (!lnet_is_gateway_net_alive(llpn)) {
437 lnet_set_route_aliveness(route, false);
441 single_hop = net_up = false;
442 for (stp = ping_iter_first(&piter, pbuf, &nid);
444 stp = ping_iter_next(&piter, &nid)) {
445 if (route->lr_net == LNET_NID_NET(&nid)) {
447 if (*stp == LNET_NI_STATUS_UP) {
454 route->lr_single_hop = single_hop;
455 if (avoid_asym_router_failure &&
456 (route->lr_hops == 1 || route->lr_single_hop))
457 lnet_set_route_aliveness(route, net_up);
459 lnet_set_route_aliveness(route, true);
462 * warn that the route is configured as single-hop but it
463 * really is multi-hop as far as we can tell.
465 lnet_check_route_inconsistency(route);
470 lnet_router_discovery_complete(struct lnet_peer *lp)
472 struct lnet_peer_ni *lpni = NULL;
473 struct lnet_route *route;
475 spin_lock(&lp->lp_lock);
476 lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
477 lp->lp_state |= LNET_PEER_RTR_DISCOVERED;
478 lp->lp_alive = lp->lp_dc_error == 0;
479 spin_unlock(&lp->lp_lock);
481 if (!lp->lp_dc_error)
485 * We do not send messages directly to the remote interfaces
486 * of an LNet router. As such, we rely on the PING response
487 * to determine the up/down status of these interfaces. If
488 * a PING response is not receieved, or some other problem with
489 * discovery occurs that prevents us from getting this status,
490 * we assume all interfaces are down until we're able to
491 * determine otherwise.
493 CDEBUG(D_NET, "%s: Router discovery failed %d\n",
494 libcfs_nidstr(&lp->lp_primary_nid), lp->lp_dc_error);
495 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
496 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
498 list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
499 lnet_set_route_aliveness(route, false);
503 lnet_rtr_addref_locked(struct lnet_peer *lp)
505 LASSERT(lp->lp_rtr_refcount >= 0);
507 /* lnet_net_lock must be exclusively locked */
508 lp->lp_rtr_refcount++;
509 if (lp->lp_rtr_refcount == 1) {
510 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
511 /* addref for the_lnet.ln_routers */
512 lnet_peer_addref_locked(lp);
513 the_lnet.ln_routers_version++;
518 lnet_rtr_decref_locked(struct lnet_peer *lp)
520 LASSERT(atomic_read(&lp->lp_refcount) > 0);
521 LASSERT(lp->lp_rtr_refcount > 0);
523 /* lnet_net_lock must be exclusively locked */
524 lp->lp_rtr_refcount--;
525 if (lp->lp_rtr_refcount == 0) {
526 LASSERT(list_empty(&lp->lp_routes));
528 list_del(&lp->lp_rtr_list);
529 /* decref for the_lnet.ln_routers */
530 lnet_peer_decref_locked(lp);
531 the_lnet.ln_routers_version++;
535 struct lnet_remotenet *
536 lnet_find_rnet_locked(__u32 net)
538 struct lnet_remotenet *rnet;
539 struct list_head *rn_list;
541 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
543 rn_list = lnet_net2rnethash(net);
544 list_for_each_entry(rnet, rn_list, lrn_list) {
545 if (rnet->lrn_net == net)
551 static void lnet_shuffle_seed(void)
554 struct lnet_ni *ni = NULL;
559 /* Nodes with small feet have little entropy
560 * the NID for this node gives the most entropy in the low bits */
561 while ((ni = lnet_get_next_ni_locked(NULL, ni)))
562 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
567 /* NB expects LNET_LOCK held */
569 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
571 struct lnet_peer_net *lpn;
572 unsigned int offset = 0;
573 unsigned int len = 0;
579 list_for_each(e, &rnet->lrn_routes)
583 * Randomly adding routes to the list is done to ensure that when
584 * different nodes are using the same list of routers, they end up
585 * preferring different routers.
587 offset = prandom_u32_max(len + 1);
588 list_for_each(e, &rnet->lrn_routes) {
593 list_add(&route->lr_list, e);
595 * force a router check on the gateway to make sure the route is
598 now = ktime_get_real_seconds();
599 list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
601 lpn->lpn_next_ping = now;
604 the_lnet.ln_remote_nets_version++;
606 /* add the route on the gateway list */
607 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
609 /* take a router reference count on the gateway */
610 lnet_rtr_addref_locked(route->lr_gateway);
614 lnet_add_route(__u32 net, __u32 hops, struct lnet_nid *gateway,
615 __u32 priority, __u32 sensitivity)
616 __must_hold(&the_lnet.ln_api_mutex)
618 struct list_head *route_entry;
619 struct lnet_remotenet *rnet;
620 struct lnet_remotenet *rnet2;
621 struct lnet_route *route;
622 struct lnet_peer_ni *lpni;
623 struct lnet_peer *gw;
627 CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
628 libcfs_net2str(net), hops, priority, libcfs_nidstr(gateway));
630 if (LNET_NID_IS_ANY(gateway) ||
631 nid_is_lo0(gateway) ||
632 net == LNET_NET_ANY ||
633 LNET_NETTYP(net) == LOLND ||
634 LNET_NID_NET(gateway) == net ||
635 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
638 /* it's a local network */
639 if (lnet_islocalnet(net))
642 if (!lnet_islocalnet(LNET_NID_NET(gateway))) {
643 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
644 libcfs_nidstr(gateway),
645 libcfs_net2str(LNET_NID_NET(gateway)));
646 return -EHOSTUNREACH;
649 /* Assume net, route, all new */
650 LIBCFS_ALLOC(route, sizeof(*route));
651 LIBCFS_ALLOC(rnet, sizeof(*rnet));
652 if (route == NULL || rnet == NULL) {
653 CERROR("Out of memory creating route %s %d %s\n",
654 libcfs_net2str(net), hops, libcfs_nidstr(gateway));
656 LIBCFS_FREE(route, sizeof(*route));
658 LIBCFS_FREE(rnet, sizeof(*rnet));
662 INIT_LIST_HEAD(&rnet->lrn_routes);
664 /* store the local and remote net that the route represents */
665 route->lr_lnet = LNET_NID_NET(gateway);
667 route->lr_nid = *gateway;
668 route->lr_priority = priority;
669 route->lr_hops = hops;
670 if (lnet_peers_start_down())
671 atomic_set(&route->lr_alive, 0);
673 atomic_set(&route->lr_alive, 1);
675 lnet_net_lock(LNET_LOCK_EX);
678 * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
679 * lose that once we're done
681 lpni = lnet_nid2peerni_ex(gateway);
683 lnet_net_unlock(LNET_LOCK_EX);
685 LIBCFS_FREE(route, sizeof(*route));
686 LIBCFS_FREE(rnet, sizeof(*rnet));
689 CERROR("Error %d creating route %s %d %s\n", rc,
690 libcfs_net2str(net), hops,
691 libcfs_nidstr(gateway));
696 LASSERT(lpni->lpni_peer_net);
697 LASSERT(lpni->lpni_peer_net->lpn_peer);
698 gw = lpni->lpni_peer_net->lpn_peer;
700 route->lr_gateway = gw;
702 rnet2 = lnet_find_rnet_locked(net);
705 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
709 /* Search for a duplicate route (it's a NOOP if it is) */
711 list_for_each(route_entry, &rnet2->lrn_routes) {
712 struct lnet_route *route2;
714 route2 = list_entry(route_entry, struct lnet_route, lr_list);
715 if (route2->lr_gateway == route->lr_gateway) {
720 /* our lookups must be true */
721 LASSERT(!nid_same(&route2->lr_gateway->lp_primary_nid,
726 * It is possible to add multiple routes through the same peer,
727 * but it'll be using a different NID of that peer. When the
728 * gateway is discovered, discovery will consolidate the different
729 * peers into one peer. In this case the discovery code will have
730 * to move the routes from the peer that's being deleted to the
731 * consolidated peer lp_routes list
734 gw->lp_health_sensitivity = sensitivity;
735 lnet_add_route_to_rnet(rnet2, route);
736 if (lnet_peer_discovery_disabled)
737 CWARN("Consider turning discovery on to enable full Multi-Rail routing functionality\n");
741 * get rid of the reference on the lpni.
743 lnet_peer_ni_decref_locked(lpni);
744 lnet_net_unlock(LNET_LOCK_EX);
746 /* If avoid_asym_router_failure is enabled and hop count is not
747 * set to 1 for a route that is actually single-hop, then the
748 * feature will fail to prevent the router from being selected
749 * if it is missing a NI on the remote network due to misconfiguration.
751 if (avoid_asym_router_failure && hops == LNET_UNDEFINED_HOPS)
752 CWARN("Use hops = 1 for a single-hop route when avoid_asym_router_failure feature is enabled\n");
758 LIBCFS_FREE(route, sizeof(*route));
762 LIBCFS_FREE(rnet, sizeof(*rnet));
764 /* kick start the monitor thread to handle the added route */
765 complete(&the_lnet.ln_mt_wait_complete);
771 lnet_del_route_from_rnet(struct lnet_nid *gw_nid,
772 struct list_head *route_list,
773 struct list_head *zombies)
775 struct lnet_peer *gateway;
776 struct lnet_route *route;
777 struct lnet_route *tmp;
779 list_for_each_entry_safe(route, tmp, route_list, lr_list) {
780 gateway = route->lr_gateway;
781 if (gw_nid && !nid_same(gw_nid, &gateway->lp_primary_nid))
785 * move to zombie to delete outside the lock
786 * Note that this function is called with the
787 * ln_api_mutex held as well as the exclusive net
788 * lock. Adding to the remote net list happens
789 * under the same conditions. Same goes for the
790 * gateway router list
792 list_move(&route->lr_list, zombies);
793 the_lnet.ln_remote_nets_version++;
795 list_del(&route->lr_gwlist);
796 lnet_rtr_decref_locked(gateway);
801 lnet_del_route(__u32 net, struct lnet_nid *gw)
802 __must_hold(&the_lnet.ln_api_mutex)
804 LIST_HEAD(rnet_zombies);
805 struct lnet_remotenet *rnet;
806 struct lnet_remotenet *tmp;
807 struct list_head *rn_list;
808 struct lnet_peer_ni *lpni;
809 struct lnet_route *route;
810 struct lnet_nid gw_nid;
812 struct lnet_peer *lp = NULL;
815 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
816 libcfs_net2str(net), libcfs_nidstr(gw));
818 /* NB Caller may specify either all routes via the given gateway
819 * or a specific route entry actual NIDs) */
821 lnet_net_lock(LNET_LOCK_EX);
824 lpni = lnet_peer_ni_find_locked(gw);
828 lp = lpni->lpni_peer_net->lpn_peer;
830 gw_nid = lp->lp_primary_nid;
832 lnet_peer_ni_decref_locked(lpni);
835 if (net != LNET_NET_ANY) {
836 rnet = lnet_find_rnet_locked(net);
838 lnet_net_unlock(LNET_LOCK_EX);
841 lnet_del_route_from_rnet(gw, &rnet->lrn_routes,
843 if (list_empty(&rnet->lrn_routes))
844 list_move(&rnet->lrn_list, &rnet_zombies);
848 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
849 rn_list = &the_lnet.ln_remote_nets_hash[i];
851 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
852 lnet_del_route_from_rnet(gw, &rnet->lrn_routes,
854 if (list_empty(&rnet->lrn_routes))
855 list_move(&rnet->lrn_list, &rnet_zombies);
861 * check if there are any routes remaining on the gateway
862 * If there are no more routes make sure to set the peer's
863 * lp_disc_net_id to 0 (invalid), in case we add more routes in
864 * the future on that gateway, then we start our discovery process
868 if (list_empty(&lp->lp_routes))
869 lp->lp_disc_net_id = 0;
872 lnet_net_unlock(LNET_LOCK_EX);
874 while (!list_empty(&zombies)) {
875 route = list_first_entry(&zombies, struct lnet_route, lr_list);
876 list_del(&route->lr_list);
877 LIBCFS_FREE(route, sizeof(*route));
880 while (!list_empty(&rnet_zombies)) {
881 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
883 list_del(&rnet->lrn_list);
884 LIBCFS_FREE(rnet, sizeof(*rnet));
891 lnet_destroy_routes(void)
893 lnet_del_route(LNET_NET_ANY, NULL);
896 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
898 struct lnet_rtrbufpool *rbp;
899 int i, rc = -ENOENT, j;
901 if (the_lnet.ln_rtrpools == NULL)
905 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
910 for (j = 0; j < LNET_NRBPOOLS; j++) {
911 pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
912 pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
913 pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
914 pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
921 lnet_net_lock(LNET_LOCK_EX);
922 pool_cfg->pl_routing = the_lnet.ln_routing;
923 lnet_net_unlock(LNET_LOCK_EX);
929 lnet_get_route(int idx, __u32 *net, __u32 *hops, lnet_nid_t *gateway,
930 __u32 *flags, __u32 *priority, __u32 *sensitivity)
932 struct lnet_remotenet *rnet;
933 struct list_head *rn_list;
934 struct lnet_route *route;
938 cpt = lnet_net_lock_current();
940 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
941 rn_list = &the_lnet.ln_remote_nets_hash[i];
942 list_for_each_entry(rnet, rn_list, lrn_list) {
943 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
945 *net = rnet->lrn_net;
946 *gateway = lnet_nid_to_nid4(&route->lr_nid);
947 *hops = route->lr_hops;
948 *priority = route->lr_priority;
949 *sensitivity = route->lr_gateway->
950 lp_health_sensitivity;
951 if (lnet_is_route_alive(route))
952 *flags |= LNET_RT_ALIVE;
954 *flags &= ~LNET_RT_ALIVE;
955 if (route->lr_single_hop)
956 *flags &= ~LNET_RT_MULTI_HOP;
958 *flags |= LNET_RT_MULTI_HOP;
959 lnet_net_unlock(cpt);
966 lnet_net_unlock(cpt);
971 lnet_wait_known_routerstate(void)
973 struct lnet_peer *rtr;
976 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
979 int cpt = lnet_net_lock_current();
982 list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
983 spin_lock(&rtr->lp_lock);
985 if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
987 spin_unlock(&rtr->lp_lock);
990 spin_unlock(&rtr->lp_lock);
993 lnet_net_unlock(cpt);
998 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1003 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
1006 bool update = false;
1008 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1009 if (lnet_ni_set_status(ni, status))
1016 lnet_update_ni_status_locked(void)
1018 struct lnet_net *net;
1024 LASSERT(the_lnet.ln_routing);
1026 timeout = router_ping_timeout + alive_router_check_interval;
1028 now = ktime_get_seconds();
1029 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1030 if (net->net_lnd->lnd_type == LOLND)
1033 if (now < net->net_last_alive + timeout)
1034 goto check_ni_fatal;
1036 spin_lock(&net->net_lock);
1037 /* re-check with lock */
1038 if (now < net->net_last_alive + timeout) {
1039 spin_unlock(&net->net_lock);
1040 goto check_ni_fatal;
1042 spin_unlock(&net->net_lock);
1045 * if the net didn't receive any traffic for past the
1046 * timeout on any of its constituent NIs, then mark all
1049 if (lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN)) {
1055 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1056 /* lnet_ni_set_status() will perform the same check of
1057 * ni_status while holding the ni lock. We can safely
1058 * check ni_status without that lock because it is only
1059 * written to under net_lock/EX and our caller is
1060 * holding a net lock.
1062 if (atomic_read(&ni->ni_fatal_error_on) &&
1064 *ni->ni_status != LNET_NI_STATUS_DOWN &&
1065 lnet_ni_set_status(ni, LNET_NI_STATUS_DOWN))
1073 void lnet_wait_router_start(void)
1075 if (check_routers_before_use) {
1076 /* Note that a helpful side-effect of pinging all known routers
1077 * at startup is that it makes them drop stale connections they
1078 * may have to a previous instance of me. */
1079 lnet_wait_known_routerstate();
1084 * This function is called from the monitor thread to check if there are
1085 * any active routers that need to be checked.
1087 bool lnet_router_checker_active(void)
1089 /* Router Checker thread needs to run when routing is enabled in
1090 * order to call lnet_update_ni_status_locked() */
1091 if (the_lnet.ln_routing)
1094 return !list_empty(&the_lnet.ln_routers) &&
1095 alive_router_check_interval > 0;
1099 lnet_check_routers(void)
1101 struct lnet_peer_net *first_lpn;
1102 struct lnet_peer_net *lpn;
1103 struct lnet_peer_ni *lpni;
1104 struct lnet_peer *rtr;
1114 cpt = lnet_net_lock_current();
1116 version = the_lnet.ln_routers_version;
1118 list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
1119 /* If we're currently discovering the peer then don't
1120 * issue another discovery
1122 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY)
1125 now = ktime_get_real_seconds();
1127 /* find the next local peer net which needs to be ping'd */
1131 net_id = rtr->lp_disc_net_id;
1133 lpn = lnet_get_next_peer_net_locked(rtr, net_id);
1135 CERROR("gateway %s has no networks\n",
1136 libcfs_nidstr(&rtr->lp_primary_nid));
1140 /* We looped back to the first peer net */
1141 if (first_lpn == lpn)
1146 net_id = lpn->lpn_net_id;
1147 if (!lnet_islocalnet_locked(net_id))
1152 CDEBUG(D_NET, "rtr %s(%p) %s(%p) next ping %lld\n",
1153 libcfs_nidstr(&rtr->lp_primary_nid), rtr,
1154 libcfs_net2str(net_id), lpn,
1155 lpn->lpn_next_ping);
1157 needs_ping = now >= lpn->lpn_next_ping;
1159 } while (!needs_ping);
1161 if (!found_lpn || !lpn) {
1162 CERROR("no local network found for gateway %s\n",
1163 libcfs_nidstr(&rtr->lp_primary_nid));
1170 spin_lock(&rtr->lp_lock);
1171 /* make sure we fully discover the router */
1172 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
1173 rtr->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH |
1174 LNET_PEER_RTR_DISCOVERY;
1175 spin_unlock(&rtr->lp_lock);
1177 /* find the peer_ni associated with the primary NID */
1178 lpni = lnet_peer_ni_get_locked(rtr, &rtr->lp_primary_nid);
1180 CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
1181 libcfs_nidstr(&rtr->lp_primary_nid));
1184 lnet_peer_ni_addref_locked(lpni);
1186 /* specify the net to use */
1187 rtr->lp_disc_net_id = lpn->lpn_net_id;
1189 /* discover the router */
1190 CDEBUG(D_NET, "discover %s, cpt = %d\n",
1191 libcfs_nidstr(&lpni->lpni_nid), cpt);
1192 rc = lnet_discover_peer_locked(lpni, cpt, false);
1194 /* drop ref taken above */
1195 lnet_peer_ni_decref_locked(lpni);
1198 lpn->lpn_next_ping = now + alive_router_check_interval;
1200 CERROR("Failed to discover router %s\n",
1201 libcfs_nidstr(&rtr->lp_primary_nid));
1203 /* NB cpt lock was dropped in lnet_discover_peer_locked() */
1204 if (version != the_lnet.ln_routers_version) {
1205 /* the routers list has changed */
1210 if (the_lnet.ln_routing)
1211 push = lnet_update_ni_status_locked();
1213 lnet_net_unlock(cpt);
1215 /* if the status of the ni changed update the peers */
1217 lnet_push_update_to_peers(1);
1221 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1223 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1225 while (--npages >= 0)
1226 __free_page(rb->rb_kiov[npages].bv_page);
1228 LIBCFS_FREE(rb, sz);
1231 static struct lnet_rtrbuf *
1232 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1234 int npages = rbp->rbp_npages;
1235 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1237 struct lnet_rtrbuf *rb;
1240 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1246 for (i = 0; i < npages; i++) {
1247 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt, GFP_KERNEL |
1248 __GFP_ZERO | __GFP_NORETRY);
1251 __free_page(rb->rb_kiov[i].bv_page);
1253 LIBCFS_FREE(rb, sz);
1257 rb->rb_kiov[i].bv_len = PAGE_SIZE;
1258 rb->rb_kiov[i].bv_offset = 0;
1259 rb->rb_kiov[i].bv_page = page;
1266 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1268 int npages = rbp->rbp_npages;
1269 struct lnet_rtrbuf *rb;
1272 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1276 list_splice_init(&rbp->rbp_msgs, &tmp);
1277 lnet_drop_routed_msgs_locked(&tmp, cpt);
1278 list_splice_init(&rbp->rbp_bufs, &tmp);
1279 rbp->rbp_req_nbuffers = 0;
1280 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1281 rbp->rbp_mincredits = 0;
1282 lnet_net_unlock(cpt);
1284 /* Free buffers on the free list. */
1285 while (!list_empty(&tmp)) {
1286 rb = list_first_entry(&tmp, struct lnet_rtrbuf, rb_list);
1287 list_del(&rb->rb_list);
1288 lnet_destroy_rtrbuf(rb, npages);
1293 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1296 struct lnet_rtrbuf *rb;
1298 int num_buffers = 0;
1300 int npages = rbp->rbp_npages;
1303 /* If we are called for less buffers than already in the pool, we
1304 * just lower the req_nbuffers number and excess buffers will be
1305 * thrown away as they are returned to the free list. Credits
1306 * then get adjusted as well.
1307 * If we already have enough buffers allocated to serve the
1308 * increase requested, then we can treat that the same way as we
1309 * do the decrease. */
1310 num_rb = nbufs - rbp->rbp_nbuffers;
1311 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1312 rbp->rbp_req_nbuffers = nbufs;
1313 lnet_net_unlock(cpt);
1316 /* store the older value of rbp_req_nbuffers and then set it to
1317 * the new request to prevent lnet_return_rx_credits_locked() from
1318 * freeing buffers that we need to keep around */
1319 old_req_nbufs = rbp->rbp_req_nbuffers;
1320 rbp->rbp_req_nbuffers = nbufs;
1321 lnet_net_unlock(cpt);
1323 /* allocate the buffers on a local list first. If all buffers are
1324 * allocated successfully then join this list to the rbp buffer
1325 * list. If not then free all allocated buffers. */
1326 while (num_rb-- > 0) {
1327 rb = lnet_new_rtrbuf(rbp, cpt);
1329 CERROR("lnet: error allocating %ux%u page router buffers on CPT %u: rc = %d\n",
1330 nbufs, npages, cpt, -ENOMEM);
1333 rbp->rbp_req_nbuffers = old_req_nbufs;
1334 lnet_net_unlock(cpt);
1339 list_add(&rb->rb_list, &rb_list);
1345 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1346 rbp->rbp_nbuffers += num_buffers;
1347 rbp->rbp_credits += num_buffers;
1348 rbp->rbp_mincredits = rbp->rbp_credits;
1349 /* We need to schedule blocked msg using the newly
1351 while (!list_empty(&rbp->rbp_bufs) &&
1352 !list_empty(&rbp->rbp_msgs))
1353 lnet_schedule_blocked_locked(rbp);
1355 lnet_net_unlock(cpt);
1360 while ((rb = list_first_entry_or_null(&rb_list,
1362 rb_list)) != NULL) {
1363 list_del(&rb->rb_list);
1364 lnet_destroy_rtrbuf(rb, npages);
1371 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1373 INIT_LIST_HEAD(&rbp->rbp_msgs);
1374 INIT_LIST_HEAD(&rbp->rbp_bufs);
1376 rbp->rbp_npages = npages;
1377 rbp->rbp_credits = 0;
1378 rbp->rbp_mincredits = 0;
1382 lnet_rtrpools_free(int keep_pools)
1384 struct lnet_rtrbufpool *rtrp;
1387 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1390 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1391 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1392 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1393 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1397 cfs_percpt_free(the_lnet.ln_rtrpools);
1398 the_lnet.ln_rtrpools = NULL;
1403 lnet_nrb_tiny_calculate(void)
1405 int nrbs = LNET_NRB_TINY;
1407 if (tiny_router_buffers < 0) {
1408 LCONSOLE_ERROR_MSG(0x10c,
1409 "tiny_router_buffers=%d invalid when "
1410 "routing enabled\n", tiny_router_buffers);
1414 if (tiny_router_buffers > 0) {
1415 if (tiny_router_buffers < LNET_NRB_TINY_MIN)
1416 CWARN("tiny_router_buffers=%d less than recommended minimum %d\n",
1417 tiny_router_buffers, LNET_NRB_TINY_MIN);
1418 nrbs = tiny_router_buffers;
1421 nrbs /= LNET_CPT_NUMBER;
1422 return max(nrbs, 1);
1426 lnet_nrb_small_calculate(void)
1428 int nrbs = LNET_NRB_SMALL;
1430 if (small_router_buffers < 0) {
1431 LCONSOLE_ERROR_MSG(0x10c,
1432 "small_router_buffers=%d invalid when "
1433 "routing enabled\n", small_router_buffers);
1437 if (small_router_buffers > 0) {
1438 if (small_router_buffers < LNET_NRB_SMALL_MIN)
1439 CWARN("small_router_buffers=%d less than recommended minimum %d\n",
1440 small_router_buffers, LNET_NRB_SMALL_MIN);
1441 nrbs = small_router_buffers;
1444 nrbs /= LNET_CPT_NUMBER;
1445 return max(nrbs, 1);
1449 lnet_nrb_large_calculate(void)
1451 int nrbs = LNET_NRB_LARGE;
1453 if (large_router_buffers < 0) {
1454 LCONSOLE_ERROR_MSG(0x10c,
1455 "large_router_buffers=%d invalid when "
1456 "routing enabled\n", large_router_buffers);
1460 if (large_router_buffers > 0) {
1461 if (large_router_buffers < LNET_NRB_LARGE_MIN)
1462 CWARN("large_router_buffers=%d less than recommended minimum %d\n",
1463 large_router_buffers, LNET_NRB_LARGE_MIN);
1464 nrbs = large_router_buffers;
1467 nrbs /= LNET_CPT_NUMBER;
1468 return max(nrbs, 1);
1472 lnet_rtrpools_alloc(int im_a_router)
1474 struct lnet_rtrbufpool *rtrp;
1481 if (!strcmp(forwarding, "")) {
1482 /* not set either way */
1485 } else if (!strcmp(forwarding, "disabled")) {
1486 /* explicitly disabled */
1488 } else if (!strcmp(forwarding, "enabled")) {
1489 /* explicitly enabled */
1492 LCONSOLE_ERROR_MSG(0x10b,
1493 "lnet: forwarding='%s' not set to either 'enabled' or 'disabled': rc = %d\n",
1498 nrb_tiny = lnet_nrb_tiny_calculate();
1502 nrb_small = lnet_nrb_small_calculate();
1506 nrb_large = lnet_nrb_large_calculate();
1510 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1512 sizeof(struct lnet_rtrbufpool));
1513 if (the_lnet.ln_rtrpools == NULL) {
1515 LCONSOLE_ERROR_MSG(0x10c,
1516 "lnet: error allocating router buffer pool: rc = %d\n",
1521 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1522 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1523 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1528 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1529 LNET_NRB_SMALL_PAGES);
1530 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1535 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1536 LNET_NRB_LARGE_PAGES);
1537 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1543 lnet_net_lock(LNET_LOCK_EX);
1544 the_lnet.ln_routing = 1;
1545 lnet_net_unlock(LNET_LOCK_EX);
1546 complete(&the_lnet.ln_mt_wait_complete);
1550 lnet_rtrpools_free(0);
1555 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1560 struct lnet_rtrbufpool *rtrp;
1562 /* If the provided values for each buffer pool are different than the
1563 * configured values, we need to take action. */
1565 tiny_router_buffers = tiny;
1566 nrb = lnet_nrb_tiny_calculate();
1567 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1568 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1575 small_router_buffers = small;
1576 nrb = lnet_nrb_small_calculate();
1577 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1578 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1585 large_router_buffers = large;
1586 nrb = lnet_nrb_large_calculate();
1587 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1588 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1599 lnet_rtrpools_adjust(int tiny, int small, int large)
1601 /* this function doesn't revert the changes if adding new buffers
1602 * failed. It's up to the user space caller to revert the
1605 if (!the_lnet.ln_routing)
1608 return lnet_rtrpools_adjust_helper(tiny, small, large);
1612 lnet_rtrpools_enable(void)
1616 if (the_lnet.ln_routing)
1619 if (the_lnet.ln_rtrpools == NULL)
1620 /* If routing is turned off, and we have never
1621 * initialized the pools before, just call the
1622 * standard buffer pool allocation routine as
1623 * if we are just configuring this for the first
1625 rc = lnet_rtrpools_alloc(1);
1627 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1631 lnet_net_lock(LNET_LOCK_EX);
1632 the_lnet.ln_routing = 1;
1634 the_lnet.ln_ping_target->pb_info.pi_features &=
1635 ~LNET_PING_FEAT_RTE_DISABLED;
1636 lnet_net_unlock(LNET_LOCK_EX);
1638 if (lnet_peer_discovery_disabled)
1639 CWARN("Consider turning discovery on to enable full "
1640 "Multi-Rail routing functionality\n");
1646 lnet_rtrpools_disable(void)
1648 if (!the_lnet.ln_routing)
1651 lnet_net_lock(LNET_LOCK_EX);
1652 the_lnet.ln_routing = 0;
1653 the_lnet.ln_ping_target->pb_info.pi_features |=
1654 LNET_PING_FEAT_RTE_DISABLED;
1656 tiny_router_buffers = 0;
1657 small_router_buffers = 0;
1658 large_router_buffers = 0;
1659 lnet_net_unlock(LNET_LOCK_EX);
1660 lnet_rtrpools_free(1);
1664 lnet_notify_peer_down(struct lnet_ni *ni, struct lnet_nid *nid)
1666 if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1667 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1671 * ni: local NI used to communicate with the peer
1673 * alive: true if peer is alive, false otherwise
1674 * reset: reset health value. This is requested by the LND.
1675 * when: notificaiton time.
1678 lnet_notify(struct lnet_ni *ni, struct lnet_nid *nid, bool alive, bool reset,
1681 struct lnet_peer_ni *lpni = NULL;
1682 struct lnet_route *route;
1683 struct lnet_peer *lp;
1684 time64_t now = ktime_get_seconds();
1687 LASSERT(!in_interrupt());
1689 CDEBUG(D_NET, "%s notifying %s: %s\n",
1690 (ni == NULL) ? "userspace" : libcfs_nidstr(&ni->ni_nid),
1691 libcfs_nidstr(nid), alive ? "up" : "down");
1694 LNET_NID_NET(&ni->ni_nid) != LNET_NID_NET(nid)) {
1695 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1696 libcfs_nidstr(nid), alive ? "birth" : "death",
1697 libcfs_nidstr(&ni->ni_nid));
1701 /* can't do predictions... */
1703 CWARN("Ignoring prediction from %s of %s %s %lld seconds in the future\n",
1704 ni ? libcfs_nidstr(&ni->ni_nid) : "userspace",
1705 libcfs_nidstr(nid), alive ? "up" : "down", when - now);
1709 if (ni != NULL && !alive && /* LND telling me she's down */
1710 !auto_down) { /* auto-down disabled */
1711 CDEBUG(D_NET, "Auto-down disabled\n");
1715 /* must lock 0 since this is used for synchronization */
1718 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1723 lpni = lnet_peer_ni_find_locked(nid);
1727 CDEBUG(D_NET, "%s not found\n", libcfs_nidstr(nid));
1733 lpni->lpni_ns_status = LNET_NI_STATUS_UP;
1734 lnet_set_lpni_healthv_locked(lpni,
1735 LNET_MAX_HEALTH_VALUE);
1737 lnet_inc_lpni_healthv_locked(lpni);
1740 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
1743 /* recalculate aliveness */
1744 alive = lnet_is_peer_ni_alive(lpni);
1746 lp = lpni->lpni_peer_net->lpn_peer;
1747 /* If this is an LNet router then update route aliveness */
1748 if (lp->lp_rtr_refcount) {
1750 /* reset flag indicates gateway peer went up or down */
1751 lp->lp_alive = alive;
1753 /* If discovery is disabled, locally or on the gateway, then
1754 * any routes using lpni as next-hop need to be updated
1756 * NB: We can get many notifications while a route is down, so
1757 * we try and avoid the expensive net_lock/EX here for the
1758 * common case of receiving duplicate lnet_notify() calls (i.e.
1759 * only grab EX lock when we actually need to update the route
1762 if (lnet_is_discovery_disabled(lp)) {
1763 list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
1764 if (nid_same(&route->lr_nid, &lpni->lpni_nid))
1765 lnet_set_route_aliveness(route, alive);
1772 if (ni != NULL && !alive)
1773 lnet_notify_peer_down(ni, &lpni->lpni_nid);
1775 cpt = lpni->lpni_cpt;
1777 lnet_peer_ni_decref_locked(lpni);
1778 lnet_net_unlock(cpt);
1782 EXPORT_SYMBOL(lnet_notify);