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 extern unsigned int lnet_current_net_count;
40 static char *forwarding = "";
41 module_param(forwarding, charp, 0444);
42 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
44 static int tiny_router_buffers;
45 module_param(tiny_router_buffers, int, 0444);
46 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
47 static int small_router_buffers;
48 module_param(small_router_buffers, int, 0444);
49 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
50 static int large_router_buffers;
51 module_param(large_router_buffers, int, 0444);
52 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
53 static int peer_buffer_credits;
54 module_param(peer_buffer_credits, int, 0444);
55 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
57 static int auto_down = 1;
58 module_param(auto_down, int, 0444);
59 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
62 lnet_peer_buffer_credits(struct lnet_net *net)
64 /* NI option overrides LNet default */
65 if (net->net_tunables.lct_peer_rtr_credits > 0)
66 return net->net_tunables.lct_peer_rtr_credits;
67 if (peer_buffer_credits > 0)
68 return peer_buffer_credits;
70 /* As an approximation, allow this peer the same number of router
71 * buffers as it is allowed outstanding sends */
72 return net->net_tunables.lct_peer_tx_credits;
75 static int check_routers_before_use;
76 module_param(check_routers_before_use, int, 0444);
77 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
79 int avoid_asym_router_failure = 1;
80 module_param(avoid_asym_router_failure, int, 0644);
81 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
83 int alive_router_check_interval = 60;
84 module_param(alive_router_check_interval, int, 0644);
85 MODULE_PARM_DESC(alive_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
87 static int router_ping_timeout = 50;
88 module_param(router_ping_timeout, int, 0644);
89 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
92 * A value between 0 and 100. 0 meaning that even if router's interfaces
93 * have the worse health still consider the gateway usable.
94 * 100 means that at least one interface on the route's remote net is 100%
95 * healthy to consider the route alive.
96 * The default is set to 100 to ensure we maintain the original behavior.
98 unsigned int router_sensitivity_percentage = 100;
99 static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
100 static struct kernel_param_ops param_ops_rtr_sensitivity = {
101 .set = rtr_sensitivity_set,
102 .get = param_get_int,
104 #define param_check_rtr_sensitivity(name, p) \
105 __param_check(name, p, int)
106 #ifdef HAVE_KERNEL_PARAM_OPS
107 module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR);
109 module_param_call(router_sensitivity_percentage, rtr_sensitivity_set, param_get_int,
110 &router_sensitivity_percentage, S_IRUGO|S_IWUSR);
112 MODULE_PARM_DESC(router_sensitivity_percentage,
113 "How healthy a gateway should be to be used in percent");
116 rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
119 unsigned *sen = (unsigned *)kp->arg;
122 rc = kstrtoul(val, 0, &value);
124 CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
128 if (value < 0 || value > 100) {
129 CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
134 * The purpose of locking the api_mutex here is to ensure that
135 * the correct value ends up stored properly.
137 mutex_lock(&the_lnet.ln_api_mutex);
141 mutex_unlock(&the_lnet.ln_api_mutex);
147 lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target)
149 struct lnet_route *route;
151 lnet_net_lock(LNET_LOCK_EX);
152 target->lp_rtr_refcount += src->lp_rtr_refcount;
153 /* move the list of queued messages to the new peer */
154 list_splice_init(&src->lp_rtrq, &target->lp_rtrq);
155 /* move all the routes that reference the peer */
156 list_splice_init(&src->lp_routes, &target->lp_routes);
157 /* update all the routes to point to the new peer */
158 list_for_each_entry(route, &target->lp_routes, lr_gwlist)
159 route->lr_gateway = target;
160 /* remove the old peer from the ln_routers list */
161 list_del_init(&src->lp_rtr_list);
162 /* add the new peer to the ln_routers list */
163 if (list_empty(&target->lp_rtr_list)) {
164 lnet_peer_addref_locked(target);
165 list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers);
167 /* reset the ref count on the old peer and decrement its ref count */
168 src->lp_rtr_refcount = 0;
169 lnet_peer_decref_locked(src);
170 /* update the router version */
171 the_lnet.ln_routers_version++;
172 lnet_net_unlock(LNET_LOCK_EX);
176 lnet_peers_start_down(void)
178 return check_routers_before_use;
182 * A net is alive if at least one gateway NI on the network is alive.
185 lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
187 struct lnet_peer_ni *lpni;
189 list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
190 if (lnet_is_peer_ni_alive(lpni))
198 * a gateway is alive only if all its nets are alive
199 * called with cpt lock held
201 bool lnet_is_gateway_alive(struct lnet_peer *gw)
203 struct lnet_peer_net *lpn;
205 list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
206 if (!lnet_is_gateway_net_alive(lpn))
214 * lnet_is_route_alive() needs to be called with cpt lock held
215 * A route is alive if the gateway can route between the local network and
216 * the remote network of the route.
217 * This means at least one NI is alive on each of the local and remote
218 * networks of the gateway.
220 bool lnet_is_route_alive(struct lnet_route *route)
222 struct lnet_peer *gw = route->lr_gateway;
223 struct lnet_peer_net *llpn;
224 struct lnet_peer_net *rlpn;
228 * check the gateway's interfaces on the route rnet to make sure
229 * that the gateway is viable.
231 llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
235 route_alive = lnet_is_gateway_net_alive(llpn);
237 if (avoid_asym_router_failure) {
238 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
241 route_alive = route_alive &&
242 lnet_is_gateway_net_alive(rlpn);
248 spin_lock(&gw->lp_lock);
249 if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
250 if (gw->lp_rtr_refcount > 0)
251 CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
252 libcfs_nid2str(gw->lp_primary_nid));
255 spin_unlock(&gw->lp_lock);
261 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
262 struct lnet_peer *new_lp)
264 struct lnet_peer_ni *lpni;
265 struct lnet_route *route;
268 * Although a route is correlated with a peer, but when it's added
269 * a specific NID is used. That NID refers to a peer_ni within
270 * a peer. There could be other peer_nis on the same net, which
271 * can be used to send to that gateway. However when we are
272 * consolidating gateways because of discovery, the nid used to
273 * add the route might've moved between gateway peers. In this
274 * case we want to move the route to the new gateway as well. The
275 * intent here is not to confuse the user who added the route.
277 list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
278 lpni = lnet_peer_get_ni_locked(orig_lp, route->lr_nid);
280 lnet_net_lock(LNET_LOCK_EX);
281 list_move(&route->lr_gwlist, &new_lp->lp_routes);
282 lnet_net_unlock(LNET_LOCK_EX);
289 lnet_router_discovery_complete(struct lnet_peer *lp)
291 struct lnet_peer_ni *lpni = NULL;
293 spin_lock(&lp->lp_lock);
294 lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
295 spin_unlock(&lp->lp_lock);
298 * Router discovery successful? All peer information would've been
299 * updated already. No need to do any more processing
301 if (!lp->lp_dc_error)
304 * discovery failed? then we need to set the status of each lpni
305 * to DOWN. It will be updated the next time we discover the
306 * router. For router peer NIs not on local networks, we never send
307 * messages directly to them, so their health will always remain
308 * at maximum. We can only tell if they are up or down from the
309 * status returned in the PING response. If we fail to get that
310 * status in our scheduled router discovery, then we'll assume
311 * it's down until we're told otherwise.
313 CDEBUG(D_NET, "%s: Router discovery failed %d\n",
314 libcfs_nid2str(lp->lp_primary_nid), lp->lp_dc_error);
315 while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
316 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
320 lnet_rtr_addref_locked(struct lnet_peer *lp)
322 LASSERT(lp->lp_rtr_refcount >= 0);
324 /* lnet_net_lock must be exclusively locked */
325 lp->lp_rtr_refcount++;
326 if (lp->lp_rtr_refcount == 1) {
327 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
328 /* addref for the_lnet.ln_routers */
329 lnet_peer_addref_locked(lp);
330 the_lnet.ln_routers_version++;
335 lnet_rtr_decref_locked(struct lnet_peer *lp)
337 LASSERT(atomic_read(&lp->lp_refcount) > 0);
338 LASSERT(lp->lp_rtr_refcount > 0);
340 /* lnet_net_lock must be exclusively locked */
341 lp->lp_rtr_refcount--;
342 if (lp->lp_rtr_refcount == 0) {
343 LASSERT(list_empty(&lp->lp_routes));
345 list_del(&lp->lp_rtr_list);
346 /* decref for the_lnet.ln_routers */
347 lnet_peer_decref_locked(lp);
348 the_lnet.ln_routers_version++;
352 struct lnet_remotenet *
353 lnet_find_rnet_locked(__u32 net)
355 struct lnet_remotenet *rnet;
356 struct list_head *tmp;
357 struct list_head *rn_list;
359 LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
361 rn_list = lnet_net2rnethash(net);
362 list_for_each(tmp, rn_list) {
363 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
365 if (rnet->lrn_net == net)
371 static void lnet_shuffle_seed(void)
374 struct lnet_ni *ni = NULL;
379 /* Nodes with small feet have little entropy
380 * the NID for this node gives the most entropy in the low bits */
381 while ((ni = lnet_get_next_ni_locked(NULL, ni)))
382 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
388 /* NB expects LNET_LOCK held */
390 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
392 struct lnet_peer_net *lpn;
393 unsigned int offset = 0;
394 unsigned int len = 0;
399 list_for_each(e, &rnet->lrn_routes)
403 * Randomly adding routes to the list is done to ensure that when
404 * different nodes are using the same list of routers, they end up
405 * preferring different routers.
407 offset = cfs_rand() % (len + 1);
408 list_for_each(e, &rnet->lrn_routes) {
413 list_add(&route->lr_list, e);
415 * force a router check on the gateway to make sure the route is
418 list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
420 lpn->lpn_rtrcheck_timestamp = 0;
423 the_lnet.ln_remote_nets_version++;
425 /* add the route on the gateway list */
426 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
428 /* take a router reference count on the gateway */
429 lnet_rtr_addref_locked(route->lr_gateway);
433 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
434 __u32 priority, __u32 sensitivity)
436 struct list_head *route_entry;
437 struct lnet_remotenet *rnet;
438 struct lnet_remotenet *rnet2;
439 struct lnet_route *route;
440 struct lnet_peer_ni *lpni;
441 struct lnet_peer *gw;
445 CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
446 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
448 if (gateway == LNET_NID_ANY ||
449 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
450 net == LNET_NIDNET(LNET_NID_ANY) ||
451 LNET_NETTYP(net) == LOLND ||
452 LNET_NIDNET(gateway) == net ||
453 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
456 /* it's a local network */
457 if (lnet_islocalnet(net))
460 if (!lnet_islocalnet(LNET_NIDNET(gateway))) {
461 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
462 libcfs_nid2str(gateway),
463 libcfs_net2str(LNET_NIDNET(gateway)));
467 /* Assume net, route, all new */
468 LIBCFS_ALLOC(route, sizeof(*route));
469 LIBCFS_ALLOC(rnet, sizeof(*rnet));
470 if (route == NULL || rnet == NULL) {
471 CERROR("Out of memory creating route %s %d %s\n",
472 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
474 LIBCFS_FREE(route, sizeof(*route));
476 LIBCFS_FREE(rnet, sizeof(*rnet));
480 INIT_LIST_HEAD(&rnet->lrn_routes);
482 /* store the local and remote net that the route represents */
483 route->lr_lnet = LNET_NIDNET(gateway);
485 route->lr_nid = gateway;
486 route->lr_priority = priority;
487 route->lr_hops = hops;
489 lnet_net_lock(LNET_LOCK_EX);
492 * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
493 * lose that once we're done
495 lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
497 lnet_net_unlock(LNET_LOCK_EX);
499 LIBCFS_FREE(route, sizeof(*route));
500 LIBCFS_FREE(rnet, sizeof(*rnet));
503 CERROR("Error %d creating route %s %d %s\n", rc,
504 libcfs_net2str(net), hops,
505 libcfs_nid2str(gateway));
509 LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
510 gw = lpni->lpni_peer_net->lpn_peer;
512 route->lr_gateway = gw;
514 rnet2 = lnet_find_rnet_locked(net);
517 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
521 /* Search for a duplicate route (it's a NOOP if it is) */
523 list_for_each(route_entry, &rnet2->lrn_routes) {
524 struct lnet_route *route2;
526 route2 = list_entry(route_entry, struct lnet_route, lr_list);
527 if (route2->lr_gateway == route->lr_gateway) {
532 /* our lookups must be true */
533 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
537 * It is possible to add multiple routes through the same peer,
538 * but it'll be using a different NID of that peer. When the
539 * gateway is discovered, discovery will consolidate the different
540 * peers into one peer. In this case the discovery code will have
541 * to move the routes from the peer that's being deleted to the
542 * consolidated peer lp_routes list
545 gw->lp_health_sensitivity = sensitivity;
546 lnet_add_route_to_rnet(rnet2, route);
550 * get rid of the reference on the lpni.
552 lnet_peer_ni_decref_locked(lpni);
553 lnet_net_unlock(LNET_LOCK_EX);
559 LIBCFS_FREE(route, sizeof(*route));
563 LIBCFS_FREE(rnet, sizeof(*rnet));
565 /* kick start the monitor thread to handle the added route */
566 wake_up(&the_lnet.ln_mt_waitq);
572 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
573 struct list_head *zombies)
575 struct lnet_peer *gateway;
576 struct lnet_route *route;
577 struct lnet_route *tmp;
579 list_for_each_entry_safe(route, tmp, route_list, lr_list) {
580 gateway = route->lr_gateway;
581 if (gw_nid != LNET_NID_ANY &&
582 gw_nid != gateway->lp_primary_nid)
586 * move to zombie to delete outside the lock
587 * Note that this function is called with the
588 * ln_api_mutex held as well as the exclusive net
589 * lock. Adding to the remote net list happens
590 * under the same conditions. Same goes for the
591 * gateway router list
593 list_move(&route->lr_list, zombies);
594 the_lnet.ln_remote_nets_version++;
596 list_del(&route->lr_gwlist);
597 lnet_rtr_decref_locked(gateway);
602 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
604 struct list_head rnet_zombies;
605 struct lnet_remotenet *rnet;
606 struct lnet_remotenet *tmp;
607 struct list_head *rn_list;
608 struct lnet_peer_ni *lpni;
609 struct lnet_route *route;
610 struct list_head zombies;
611 struct lnet_peer *lp;
614 INIT_LIST_HEAD(&rnet_zombies);
615 INIT_LIST_HEAD(&zombies);
617 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
618 libcfs_net2str(net), libcfs_nid2str(gw_nid));
620 /* NB Caller may specify either all routes via the given gateway
621 * or a specific route entry actual NIDs) */
623 lnet_net_lock(LNET_LOCK_EX);
625 lpni = lnet_find_peer_ni_locked(gw_nid);
627 lp = lpni->lpni_peer_net->lpn_peer;
629 gw_nid = lp->lp_primary_nid;
630 lnet_peer_ni_decref_locked(lpni);
633 if (net != LNET_NIDNET(LNET_NID_ANY)) {
634 rnet = lnet_find_rnet_locked(net);
636 lnet_net_unlock(LNET_LOCK_EX);
639 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
641 if (list_empty(&rnet->lrn_routes))
642 list_move(&rnet->lrn_list, &rnet_zombies);
646 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
647 rn_list = &the_lnet.ln_remote_nets_hash[i];
649 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
650 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
652 if (list_empty(&rnet->lrn_routes))
653 list_move(&rnet->lrn_list, &rnet_zombies);
659 * check if there are any routes remaining on the gateway
660 * If there are no more routes make sure to set the peer's
661 * lp_disc_net_id to 0 (invalid), in case we add more routes in
662 * the future on that gateway, then we start our discovery process
666 if (list_empty(&lp->lp_routes))
667 lp->lp_disc_net_id = 0;
670 lnet_net_unlock(LNET_LOCK_EX);
672 while (!list_empty(&zombies)) {
673 route = list_first_entry(&zombies, struct lnet_route, lr_list);
674 list_del(&route->lr_list);
675 LIBCFS_FREE(route, sizeof(*route));
678 while (!list_empty(&rnet_zombies)) {
679 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
681 list_del(&rnet->lrn_list);
682 LIBCFS_FREE(rnet, sizeof(*rnet));
689 lnet_destroy_routes (void)
691 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
694 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
696 struct lnet_rtrbufpool *rbp;
697 int i, rc = -ENOENT, j;
699 if (the_lnet.ln_rtrpools == NULL)
703 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
708 for (j = 0; j < LNET_NRBPOOLS; j++) {
709 pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
710 pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
711 pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
712 pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
719 lnet_net_lock(LNET_LOCK_EX);
720 pool_cfg->pl_routing = the_lnet.ln_routing;
721 lnet_net_unlock(LNET_LOCK_EX);
727 lnet_get_route(int idx, __u32 *net, __u32 *hops,
728 lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
730 struct lnet_remotenet *rnet;
731 struct list_head *rn_list;
732 struct lnet_route *route;
733 struct list_head *e1;
734 struct list_head *e2;
738 cpt = lnet_net_lock_current();
740 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
741 rn_list = &the_lnet.ln_remote_nets_hash[i];
742 list_for_each(e1, rn_list) {
743 rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
745 list_for_each(e2, &rnet->lrn_routes) {
746 route = list_entry(e2, struct lnet_route,
750 *net = rnet->lrn_net;
751 *gateway = route->lr_nid;
752 *hops = route->lr_hops;
753 *priority = route->lr_priority;
754 *sensitivity = route->lr_gateway->
755 lp_health_sensitivity;
756 *alive = lnet_is_route_alive(route);
757 lnet_net_unlock(cpt);
764 lnet_net_unlock(cpt);
769 lnet_wait_known_routerstate(void)
771 struct lnet_peer *rtr;
772 struct list_head *entry;
775 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
778 int cpt = lnet_net_lock_current();
781 list_for_each(entry, &the_lnet.ln_routers) {
782 rtr = list_entry(entry, struct lnet_peer,
785 spin_lock(&rtr->lp_lock);
787 if ((rtr->lp_state & LNET_PEER_DISCOVERED) == 0) {
789 spin_unlock(&rtr->lp_lock);
792 spin_unlock(&rtr->lp_lock);
795 lnet_net_unlock(cpt);
800 set_current_state(TASK_UNINTERRUPTIBLE);
801 schedule_timeout(cfs_time_seconds(1));
806 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
811 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
814 ni->ni_status->ns_status != status) {
815 ni->ni_status->ns_status = status;
825 lnet_update_ni_status_locked(void)
827 struct lnet_net *net;
832 LASSERT(the_lnet.ln_routing);
834 timeout = router_ping_timeout + alive_router_check_interval;
836 now = ktime_get_real_seconds();
837 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
838 if (net->net_lnd->lnd_type == LOLND)
841 if (now < net->net_last_alive + timeout)
844 spin_lock(&net->net_lock);
845 /* re-check with lock */
846 if (now < net->net_last_alive + timeout) {
847 spin_unlock(&net->net_lock);
850 spin_unlock(&net->net_lock);
853 * if the net didn't receive any traffic for past the
854 * timeout on any of its constituent NIs, then mark all
857 push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN);
863 void lnet_wait_router_start(void)
865 if (check_routers_before_use) {
866 /* Note that a helpful side-effect of pinging all known routers
867 * at startup is that it makes them drop stale connections they
868 * may have to a previous instance of me. */
869 lnet_wait_known_routerstate();
874 * This function is called from the monitor thread to check if there are
875 * any active routers that need to be checked.
878 lnet_router_checker_active(void)
880 /* Router Checker thread needs to run when routing is enabled in
881 * order to call lnet_update_ni_status_locked() */
882 if (the_lnet.ln_routing)
885 return !list_empty(&the_lnet.ln_routers) &&
886 alive_router_check_interval > 0;
890 lnet_check_routers(void)
892 struct lnet_peer_net *first_lpn = NULL;
893 struct lnet_peer_net *lpn;
894 struct lnet_peer_ni *lpni;
895 struct list_head *entry;
896 struct lnet_peer *rtr;
905 cpt = lnet_net_lock_current();
907 version = the_lnet.ln_routers_version;
909 list_for_each(entry, &the_lnet.ln_routers) {
910 rtr = list_entry(entry, struct lnet_peer,
913 now = ktime_get_real_seconds();
916 * only discover the router if we've passed
917 * alive_router_check_interval seconds. Some of the router
918 * interfaces could be down and in that case they would be
919 * undergoing recovery separately from this discovery.
921 /* find next peer net which is also local */
922 net_id = rtr->lp_disc_net_id;
924 lpn = lnet_get_next_peer_net_locked(rtr, net_id);
926 CERROR("gateway %s has no networks\n",
927 libcfs_nid2str(rtr->lp_primary_nid));
930 if (first_lpn == lpn)
934 found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id);
935 net_id = lpn->lpn_net_id;
936 } while (!found_lpn);
938 if (!found_lpn || !lpn) {
939 CERROR("no local network found for gateway %s\n",
940 libcfs_nid2str(rtr->lp_primary_nid));
944 if (now - lpn->lpn_rtrcheck_timestamp <
945 alive_router_check_interval / lnet_current_net_count)
949 * If we're currently discovering the peer then don't
950 * issue another discovery
952 spin_lock(&rtr->lp_lock);
953 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) {
954 spin_unlock(&rtr->lp_lock);
957 /* make sure we actively discover the router */
958 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
959 rtr->lp_state |= LNET_PEER_RTR_DISCOVERY;
960 spin_unlock(&rtr->lp_lock);
962 /* find the peer_ni associated with the primary NID */
963 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
965 CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
966 libcfs_nid2str(rtr->lp_primary_nid));
969 lnet_peer_ni_addref_locked(lpni);
971 /* specify the net to use */
972 rtr->lp_disc_net_id = lpn->lpn_net_id;
974 /* discover the router */
975 CDEBUG(D_NET, "discover %s, cpt = %d\n",
976 libcfs_nid2str(lpni->lpni_nid), cpt);
977 rc = lnet_discover_peer_locked(lpni, cpt, false);
979 /* decrement ref count acquired by find_peer_ni_locked() */
980 lnet_peer_ni_decref_locked(lpni);
983 lpn->lpn_rtrcheck_timestamp = now;
985 CERROR("Failed to discover router %s\n",
986 libcfs_nid2str(rtr->lp_primary_nid));
988 /* NB dropped lock */
989 if (version != the_lnet.ln_routers_version) {
990 /* the routers list has changed */
995 if (the_lnet.ln_routing)
996 push = lnet_update_ni_status_locked();
998 lnet_net_unlock(cpt);
1000 /* if the status of the ni changed update the peers */
1002 lnet_push_update_to_peers(1);
1006 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1008 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1010 while (--npages >= 0)
1011 __free_page(rb->rb_kiov[npages].kiov_page);
1013 LIBCFS_FREE(rb, sz);
1016 static struct lnet_rtrbuf *
1017 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1019 int npages = rbp->rbp_npages;
1020 int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1022 struct lnet_rtrbuf *rb;
1025 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1031 for (i = 0; i < npages; i++) {
1032 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1033 GFP_KERNEL | __GFP_ZERO);
1036 __free_page(rb->rb_kiov[i].kiov_page);
1038 LIBCFS_FREE(rb, sz);
1042 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
1043 rb->rb_kiov[i].kiov_offset = 0;
1044 rb->rb_kiov[i].kiov_page = page;
1051 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1053 int npages = rbp->rbp_npages;
1054 struct lnet_rtrbuf *rb;
1055 struct list_head tmp;
1057 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1060 INIT_LIST_HEAD(&tmp);
1063 list_splice_init(&rbp->rbp_msgs, &tmp);
1064 lnet_drop_routed_msgs_locked(&tmp, cpt);
1065 list_splice_init(&rbp->rbp_bufs, &tmp);
1066 rbp->rbp_req_nbuffers = 0;
1067 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1068 rbp->rbp_mincredits = 0;
1069 lnet_net_unlock(cpt);
1071 /* Free buffers on the free list. */
1072 while (!list_empty(&tmp)) {
1073 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1074 list_del(&rb->rb_list);
1075 lnet_destroy_rtrbuf(rb, npages);
1080 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1082 struct list_head rb_list;
1083 struct lnet_rtrbuf *rb;
1085 int num_buffers = 0;
1087 int npages = rbp->rbp_npages;
1090 /* If we are called for less buffers than already in the pool, we
1091 * just lower the req_nbuffers number and excess buffers will be
1092 * thrown away as they are returned to the free list. Credits
1093 * then get adjusted as well.
1094 * If we already have enough buffers allocated to serve the
1095 * increase requested, then we can treat that the same way as we
1096 * do the decrease. */
1097 num_rb = nbufs - rbp->rbp_nbuffers;
1098 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1099 rbp->rbp_req_nbuffers = nbufs;
1100 lnet_net_unlock(cpt);
1103 /* store the older value of rbp_req_nbuffers and then set it to
1104 * the new request to prevent lnet_return_rx_credits_locked() from
1105 * freeing buffers that we need to keep around */
1106 old_req_nbufs = rbp->rbp_req_nbuffers;
1107 rbp->rbp_req_nbuffers = nbufs;
1108 lnet_net_unlock(cpt);
1110 INIT_LIST_HEAD(&rb_list);
1112 /* allocate the buffers on a local list first. If all buffers are
1113 * allocated successfully then join this list to the rbp buffer
1114 * list. If not then free all allocated buffers. */
1115 while (num_rb-- > 0) {
1116 rb = lnet_new_rtrbuf(rbp, cpt);
1118 CERROR("Failed to allocate %d route bufs of %d pages\n",
1122 rbp->rbp_req_nbuffers = old_req_nbufs;
1123 lnet_net_unlock(cpt);
1128 list_add(&rb->rb_list, &rb_list);
1134 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1135 rbp->rbp_nbuffers += num_buffers;
1136 rbp->rbp_credits += num_buffers;
1137 rbp->rbp_mincredits = rbp->rbp_credits;
1138 /* We need to schedule blocked msg using the newly
1140 while (!list_empty(&rbp->rbp_bufs) &&
1141 !list_empty(&rbp->rbp_msgs))
1142 lnet_schedule_blocked_locked(rbp);
1144 lnet_net_unlock(cpt);
1149 while (!list_empty(&rb_list)) {
1150 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1151 list_del(&rb->rb_list);
1152 lnet_destroy_rtrbuf(rb, npages);
1159 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1161 INIT_LIST_HEAD(&rbp->rbp_msgs);
1162 INIT_LIST_HEAD(&rbp->rbp_bufs);
1164 rbp->rbp_npages = npages;
1165 rbp->rbp_credits = 0;
1166 rbp->rbp_mincredits = 0;
1170 lnet_rtrpools_free(int keep_pools)
1172 struct lnet_rtrbufpool *rtrp;
1175 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1178 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1179 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1180 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1181 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1185 cfs_percpt_free(the_lnet.ln_rtrpools);
1186 the_lnet.ln_rtrpools = NULL;
1191 lnet_nrb_tiny_calculate(void)
1193 int nrbs = LNET_NRB_TINY;
1195 if (tiny_router_buffers < 0) {
1196 LCONSOLE_ERROR_MSG(0x10c,
1197 "tiny_router_buffers=%d invalid when "
1198 "routing enabled\n", tiny_router_buffers);
1202 if (tiny_router_buffers > 0)
1203 nrbs = tiny_router_buffers;
1205 nrbs /= LNET_CPT_NUMBER;
1206 return max(nrbs, LNET_NRB_TINY_MIN);
1210 lnet_nrb_small_calculate(void)
1212 int nrbs = LNET_NRB_SMALL;
1214 if (small_router_buffers < 0) {
1215 LCONSOLE_ERROR_MSG(0x10c,
1216 "small_router_buffers=%d invalid when "
1217 "routing enabled\n", small_router_buffers);
1221 if (small_router_buffers > 0)
1222 nrbs = small_router_buffers;
1224 nrbs /= LNET_CPT_NUMBER;
1225 return max(nrbs, LNET_NRB_SMALL_MIN);
1229 lnet_nrb_large_calculate(void)
1231 int nrbs = LNET_NRB_LARGE;
1233 if (large_router_buffers < 0) {
1234 LCONSOLE_ERROR_MSG(0x10c,
1235 "large_router_buffers=%d invalid when "
1236 "routing enabled\n", large_router_buffers);
1240 if (large_router_buffers > 0)
1241 nrbs = large_router_buffers;
1243 nrbs /= LNET_CPT_NUMBER;
1244 return max(nrbs, LNET_NRB_LARGE_MIN);
1248 lnet_rtrpools_alloc(int im_a_router)
1250 struct lnet_rtrbufpool *rtrp;
1257 if (!strcmp(forwarding, "")) {
1258 /* not set either way */
1261 } else if (!strcmp(forwarding, "disabled")) {
1262 /* explicitly disabled */
1264 } else if (!strcmp(forwarding, "enabled")) {
1265 /* explicitly enabled */
1267 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1268 "'enabled' or 'disabled'\n");
1272 nrb_tiny = lnet_nrb_tiny_calculate();
1276 nrb_small = lnet_nrb_small_calculate();
1280 nrb_large = lnet_nrb_large_calculate();
1284 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1286 sizeof(struct lnet_rtrbufpool));
1287 if (the_lnet.ln_rtrpools == NULL) {
1288 LCONSOLE_ERROR_MSG(0x10c,
1289 "Failed to initialize router buffe pool\n");
1293 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1294 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1295 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1300 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1301 LNET_NRB_SMALL_PAGES);
1302 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1307 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1308 LNET_NRB_LARGE_PAGES);
1309 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1315 lnet_net_lock(LNET_LOCK_EX);
1316 the_lnet.ln_routing = 1;
1317 lnet_net_unlock(LNET_LOCK_EX);
1318 wake_up(&the_lnet.ln_mt_waitq);
1322 lnet_rtrpools_free(0);
1327 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1332 struct lnet_rtrbufpool *rtrp;
1334 /* If the provided values for each buffer pool are different than the
1335 * configured values, we need to take action. */
1337 tiny_router_buffers = tiny;
1338 nrb = lnet_nrb_tiny_calculate();
1339 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1340 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1347 small_router_buffers = small;
1348 nrb = lnet_nrb_small_calculate();
1349 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1350 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1357 large_router_buffers = large;
1358 nrb = lnet_nrb_large_calculate();
1359 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1360 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1371 lnet_rtrpools_adjust(int tiny, int small, int large)
1373 /* this function doesn't revert the changes if adding new buffers
1374 * failed. It's up to the user space caller to revert the
1377 if (!the_lnet.ln_routing)
1380 return lnet_rtrpools_adjust_helper(tiny, small, large);
1384 lnet_rtrpools_enable(void)
1388 if (the_lnet.ln_routing)
1391 if (the_lnet.ln_rtrpools == NULL)
1392 /* If routing is turned off, and we have never
1393 * initialized the pools before, just call the
1394 * standard buffer pool allocation routine as
1395 * if we are just configuring this for the first
1397 rc = lnet_rtrpools_alloc(1);
1399 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1403 lnet_net_lock(LNET_LOCK_EX);
1404 the_lnet.ln_routing = 1;
1406 the_lnet.ln_ping_target->pb_info.pi_features &=
1407 ~LNET_PING_FEAT_RTE_DISABLED;
1408 lnet_net_unlock(LNET_LOCK_EX);
1414 lnet_rtrpools_disable(void)
1416 if (!the_lnet.ln_routing)
1419 lnet_net_lock(LNET_LOCK_EX);
1420 the_lnet.ln_routing = 0;
1421 the_lnet.ln_ping_target->pb_info.pi_features |=
1422 LNET_PING_FEAT_RTE_DISABLED;
1424 tiny_router_buffers = 0;
1425 small_router_buffers = 0;
1426 large_router_buffers = 0;
1427 lnet_net_unlock(LNET_LOCK_EX);
1428 lnet_rtrpools_free(1);
1432 lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid)
1434 if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1435 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1439 * ni: local NI used to communicate with the peer
1441 * alive: true if peer is alive, false otherwise
1442 * reset: reset health value. This is requested by the LND.
1443 * when: notificaiton time.
1446 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
1449 struct lnet_peer_ni *lpni = NULL;
1450 time64_t now = ktime_get_seconds();
1453 LASSERT (!in_interrupt ());
1455 CDEBUG (D_NET, "%s notifying %s: %s\n",
1456 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1457 libcfs_nid2str(nid),
1458 alive ? "up" : "down");
1461 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1462 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1463 libcfs_nid2str(nid), alive ? "birth" : "death",
1464 libcfs_nid2str(ni->ni_nid));
1468 /* can't do predictions... */
1470 CWARN("Ignoring prediction from %s of %s %s "
1471 "%lld seconds in the future\n",
1472 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1473 libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1477 if (ni != NULL && !alive && /* LND telling me she's down */
1478 !auto_down) { /* auto-down disabled */
1479 CDEBUG(D_NET, "Auto-down disabled\n");
1483 /* must lock 0 since this is used for synchronization */
1486 if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1491 lpni = lnet_find_peer_ni_locked(nid);
1495 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1501 lnet_set_healthv(&lpni->lpni_healthv,
1502 LNET_MAX_HEALTH_VALUE);
1504 lnet_inc_healthv(&lpni->lpni_healthv);
1506 lnet_handle_remote_failure_locked(lpni);
1509 /* recalculate aliveness */
1510 alive = lnet_is_peer_ni_alive(lpni);
1513 if (ni != NULL && !alive)
1514 lnet_notify_peer_down(ni, lpni->lpni_nid);
1516 cpt = lpni->lpni_cpt;
1518 lnet_peer_ni_decref_locked(lpni);
1519 lnet_net_unlock(cpt);
1523 EXPORT_SYMBOL(lnet_notify);