2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2016, Intel Corporation.
6 * This file is part of Lustre, https://wiki.hpdd.intel.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
24 #include <lnet/lib-lnet.h>
26 #define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
27 #define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4)
28 #define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */
29 #define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
30 #define LNET_NRB_SMALL_PAGES 1
31 #define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
32 #define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
33 #define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_SIZE - 1) >> \
36 static char *forwarding = "";
37 module_param(forwarding, charp, 0444);
38 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
40 static int tiny_router_buffers;
41 module_param(tiny_router_buffers, int, 0444);
42 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
43 static int small_router_buffers;
44 module_param(small_router_buffers, int, 0444);
45 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
46 static int large_router_buffers;
47 module_param(large_router_buffers, int, 0444);
48 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
49 static int peer_buffer_credits;
50 module_param(peer_buffer_credits, int, 0444);
51 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
53 static int auto_down = 1;
54 module_param(auto_down, int, 0444);
55 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
58 lnet_peer_buffer_credits(lnet_ni_t *ni)
60 /* NI option overrides LNet default */
61 if (ni->ni_peerrtrcredits > 0)
62 return ni->ni_peerrtrcredits;
63 if (peer_buffer_credits > 0)
64 return peer_buffer_credits;
66 /* As an approximation, allow this peer the same number of router
67 * buffers as it is allowed outstanding sends */
68 return ni->ni_peertxcredits;
72 static int lnet_router_checker(void *);
74 static int check_routers_before_use;
75 module_param(check_routers_before_use, int, 0444);
76 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
78 int avoid_asym_router_failure = 1;
79 module_param(avoid_asym_router_failure, int, 0644);
80 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
82 static int dead_router_check_interval = 60;
83 module_param(dead_router_check_interval, int, 0644);
84 MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
86 static int live_router_check_interval = 60;
87 module_param(live_router_check_interval, int, 0644);
88 MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
90 static int router_ping_timeout = 50;
91 module_param(router_ping_timeout, int, 0644);
92 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
95 lnet_peers_start_down(void)
97 return check_routers_before_use;
101 lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when)
103 if (cfs_time_before(when, lp->lp_timestamp)) { /* out of date information */
104 CDEBUG(D_NET, "Out of date\n");
108 lp->lp_timestamp = when; /* update timestamp */
109 lp->lp_ping_deadline = 0; /* disable ping timeout */
111 if (lp->lp_alive_count != 0 && /* got old news */
112 (!lp->lp_alive) == (!alive)) { /* new date for old news */
113 CDEBUG(D_NET, "Old news\n");
117 /* Flag that notification is outstanding */
119 lp->lp_alive_count++;
120 lp->lp_alive = !(!alive); /* 1 bit! */
122 lp->lp_notifylnd |= notifylnd;
124 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
126 CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
130 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
135 /* Notify only in 1 thread at any time to ensure ordered notification.
136 * NB individual events can be missed; the only guarantee is that you
137 * always get the most recent news */
139 if (lp->lp_notifying || ni == NULL)
142 lp->lp_notifying = 1;
144 while (lp->lp_notify) {
145 alive = lp->lp_alive;
146 notifylnd = lp->lp_notifylnd;
148 lp->lp_notifylnd = 0;
151 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
152 lnet_net_unlock(lp->lp_cpt);
154 /* A new notification could happen now; I'll handle it
155 * when control returns to me */
157 (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
159 lnet_net_lock(lp->lp_cpt);
163 lp->lp_notifying = 0;
168 lnet_rtr_addref_locked(lnet_peer_t *lp)
170 LASSERT(lp->lp_refcount > 0);
171 LASSERT(lp->lp_rtr_refcount >= 0);
173 /* lnet_net_lock must be exclusively locked */
174 lp->lp_rtr_refcount++;
175 if (lp->lp_rtr_refcount == 1) {
176 struct list_head *pos;
178 /* a simple insertion sort */
179 list_for_each_prev(pos, &the_lnet.ln_routers) {
180 lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
183 if (rtr->lp_nid < lp->lp_nid)
187 list_add(&lp->lp_rtr_list, pos);
188 /* addref for the_lnet.ln_routers */
189 lnet_peer_addref_locked(lp);
190 the_lnet.ln_routers_version++;
195 lnet_rtr_decref_locked(lnet_peer_t *lp)
197 LASSERT(lp->lp_refcount > 0);
198 LASSERT(lp->lp_rtr_refcount > 0);
200 /* lnet_net_lock must be exclusively locked */
201 lp->lp_rtr_refcount--;
202 if (lp->lp_rtr_refcount == 0) {
203 LASSERT(list_empty(&lp->lp_routes));
205 if (lp->lp_rcd != NULL) {
206 list_add(&lp->lp_rcd->rcd_list,
207 &the_lnet.ln_rcd_deathrow);
211 list_del(&lp->lp_rtr_list);
212 /* decref for the_lnet.ln_routers */
213 lnet_peer_decref_locked(lp);
214 the_lnet.ln_routers_version++;
219 lnet_find_net_locked (__u32 net)
221 lnet_remotenet_t *rnet;
222 struct list_head *tmp;
223 struct list_head *rn_list;
225 LASSERT(!the_lnet.ln_shutdown);
227 rn_list = lnet_net2rnethash(net);
228 list_for_each(tmp, rn_list) {
229 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
231 if (rnet->lrn_net == net)
237 static void lnet_shuffle_seed(void)
242 struct timespec64 ts;
244 struct list_head *tmp;
249 cfs_get_random_bytes(seed, sizeof(seed));
251 /* Nodes with small feet have little entropy
252 * the NID for this node gives the most entropy in the low bits */
253 list_for_each(tmp, &the_lnet.ln_nis) {
254 ni = list_entry(tmp, lnet_ni_t, ni_list);
255 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
257 if (lnd_type != LOLND)
258 seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
262 cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
267 /* NB expects LNET_LOCK held */
269 lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
271 unsigned int len = 0;
272 unsigned int offset = 0;
277 list_for_each(e, &rnet->lrn_routes) {
281 /* len+1 positions to add a new entry, also prevents division by 0 */
282 offset = cfs_rand() % (len + 1);
283 list_for_each(e, &rnet->lrn_routes) {
288 list_add(&route->lr_list, e);
289 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
291 the_lnet.ln_remote_nets_version++;
292 lnet_rtr_addref_locked(route->lr_gateway);
296 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
297 unsigned int priority)
300 lnet_remotenet_t *rnet;
301 lnet_remotenet_t *rnet2;
307 CDEBUG(D_NET, "Add route: net %s hops %d priority %u gw %s\n",
308 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
310 if (gateway == LNET_NID_ANY ||
311 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
312 net == LNET_NIDNET(LNET_NID_ANY) ||
313 LNET_NETTYP(net) == LOLND ||
314 LNET_NIDNET(gateway) == net ||
315 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
318 if (lnet_islocalnet(net)) /* it's a local network */
321 /* Assume net, route, all new */
322 LIBCFS_ALLOC(route, sizeof(*route));
323 LIBCFS_ALLOC(rnet, sizeof(*rnet));
324 if (route == NULL || rnet == NULL) {
325 CERROR("Out of memory creating route %s %d %s\n",
326 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
328 LIBCFS_FREE(route, sizeof(*route));
330 LIBCFS_FREE(rnet, sizeof(*rnet));
334 INIT_LIST_HEAD(&rnet->lrn_routes);
336 route->lr_hops = hops;
338 route->lr_priority = priority;
340 lnet_net_lock(LNET_LOCK_EX);
342 rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
344 lnet_net_unlock(LNET_LOCK_EX);
346 LIBCFS_FREE(route, sizeof(*route));
347 LIBCFS_FREE(rnet, sizeof(*rnet));
349 if (rc == -EHOSTUNREACH) /* gateway is not on a local net. */
350 return rc; /* ignore the route entry */
351 CERROR("Error %d creating route %s %d %s\n", rc,
352 libcfs_net2str(net), hops,
353 libcfs_nid2str(gateway));
357 LASSERT(!the_lnet.ln_shutdown);
359 rnet2 = lnet_find_net_locked(net);
362 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
366 /* Search for a duplicate route (it's a NOOP if it is) */
368 list_for_each(e, &rnet2->lrn_routes) {
369 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
371 if (route2->lr_gateway == route->lr_gateway) {
376 /* our lookups must be true */
377 LASSERT(route2->lr_gateway->lp_nid != gateway);
381 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
382 lnet_add_route_to_rnet(rnet2, route);
384 ni = route->lr_gateway->lp_ni;
385 lnet_net_unlock(LNET_LOCK_EX);
387 /* XXX Assume alive */
388 if (ni->ni_lnd->lnd_notify != NULL)
389 (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
391 lnet_net_lock(LNET_LOCK_EX);
394 /* -1 for notify or !add_route */
395 lnet_peer_decref_locked(route->lr_gateway);
396 lnet_net_unlock(LNET_LOCK_EX);
402 LIBCFS_FREE(route, sizeof(*route));
406 LIBCFS_FREE(rnet, sizeof(*rnet));
408 /* indicate to startup the router checker if configured */
409 wake_up(&the_lnet.ln_rc_waitq);
415 lnet_check_routes(void)
417 lnet_remotenet_t *rnet;
419 lnet_route_t *route2;
420 struct list_head *e1;
421 struct list_head *e2;
423 struct list_head *rn_list;
426 cpt = lnet_net_lock_current();
428 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
429 rn_list = &the_lnet.ln_remote_nets_hash[i];
430 list_for_each(e1, rn_list) {
431 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
434 list_for_each(e2, &rnet->lrn_routes) {
439 route = list_entry(e2, lnet_route_t,
442 if (route2 == NULL) {
447 if (route->lr_gateway->lp_ni ==
448 route2->lr_gateway->lp_ni)
451 nid1 = route->lr_gateway->lp_nid;
452 nid2 = route2->lr_gateway->lp_nid;
455 lnet_net_unlock(cpt);
457 CERROR("Routes to %s via %s and %s not "
460 libcfs_nid2str(nid1),
461 libcfs_nid2str(nid2));
467 lnet_net_unlock(cpt);
472 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
474 struct lnet_peer *gateway;
475 lnet_remotenet_t *rnet;
477 struct list_head *e1;
478 struct list_head *e2;
480 struct list_head *rn_list;
483 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
484 libcfs_net2str(net), libcfs_nid2str(gw_nid));
486 /* NB Caller may specify either all routes via the given gateway
487 * or a specific route entry actual NIDs) */
489 lnet_net_lock(LNET_LOCK_EX);
490 if (net == LNET_NIDNET(LNET_NID_ANY))
491 rn_list = &the_lnet.ln_remote_nets_hash[0];
493 rn_list = lnet_net2rnethash(net);
496 list_for_each(e1, rn_list) {
497 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
499 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
500 net == rnet->lrn_net))
503 list_for_each(e2, &rnet->lrn_routes) {
504 route = list_entry(e2, lnet_route_t, lr_list);
506 gateway = route->lr_gateway;
507 if (!(gw_nid == LNET_NID_ANY ||
508 gw_nid == gateway->lp_nid))
511 list_del(&route->lr_list);
512 list_del(&route->lr_gwlist);
513 the_lnet.ln_remote_nets_version++;
515 if (list_empty(&rnet->lrn_routes))
516 list_del(&rnet->lrn_list);
520 lnet_rtr_decref_locked(gateway);
521 lnet_peer_decref_locked(gateway);
523 lnet_net_unlock(LNET_LOCK_EX);
525 LIBCFS_FREE(route, sizeof(*route));
528 LIBCFS_FREE(rnet, sizeof(*rnet));
531 lnet_net_lock(LNET_LOCK_EX);
536 if (net == LNET_NIDNET(LNET_NID_ANY) &&
537 ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
538 rn_list = &the_lnet.ln_remote_nets_hash[idx];
541 lnet_net_unlock(LNET_LOCK_EX);
547 lnet_destroy_routes (void)
549 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
552 int lnet_get_rtr_pool_cfg(int idx, struct lnet_ioctl_pool_cfg *pool_cfg)
554 int i, rc = -ENOENT, lidx, j;
556 if (the_lnet.ln_rtrpools == NULL)
559 for (i = 0; i < LNET_NRBPOOLS; i++) {
560 lnet_rtrbufpool_t *rbp;
562 lnet_net_lock(LNET_LOCK_EX);
564 cfs_percpt_for_each(rbp, j, the_lnet.ln_rtrpools) {
567 pool_cfg->pl_pools[i].pl_npages =
569 pool_cfg->pl_pools[i].pl_nbuffers =
571 pool_cfg->pl_pools[i].pl_credits =
573 pool_cfg->pl_pools[i].pl_mincredits =
574 rbp[i].rbp_mincredits;
578 lnet_net_unlock(LNET_LOCK_EX);
581 lnet_net_lock(LNET_LOCK_EX);
582 pool_cfg->pl_routing = the_lnet.ln_routing;
583 lnet_net_unlock(LNET_LOCK_EX);
589 lnet_get_route(int idx, __u32 *net, __u32 *hops,
590 lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
592 struct list_head *e1;
593 struct list_head *e2;
594 lnet_remotenet_t *rnet;
598 struct list_head *rn_list;
600 cpt = lnet_net_lock_current();
602 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
603 rn_list = &the_lnet.ln_remote_nets_hash[i];
604 list_for_each(e1, rn_list) {
605 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
607 list_for_each(e2, &rnet->lrn_routes) {
608 route = list_entry(e2, lnet_route_t,
612 *net = rnet->lrn_net;
613 *hops = route->lr_hops;
614 *priority = route->lr_priority;
615 *gateway = route->lr_gateway->lp_nid;
616 *alive = lnet_is_route_alive(route);
617 lnet_net_unlock(cpt);
624 lnet_net_unlock(cpt);
629 lnet_swap_pinginfo(struct lnet_ping_info *info)
632 struct lnet_ni_status *stat;
634 __swab32s(&info->pi_magic);
635 __swab32s(&info->pi_features);
636 __swab32s(&info->pi_pid);
637 __swab32s(&info->pi_nnis);
638 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
639 stat = &info->pi_ni[i];
640 __swab64s(&stat->ns_nid);
641 __swab32s(&stat->ns_status);
647 * parse router-checker pinginfo, record number of down NIs for remote
648 * networks on that router.
651 lnet_parse_rc_info(lnet_rc_data_t *rcd)
653 struct lnet_ping_info *info = rcd->rcd_pinginfo;
654 struct lnet_peer *gw = rcd->rcd_gateway;
660 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
661 lnet_swap_pinginfo(info);
663 /* NB always racing with network! */
664 if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
665 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
666 libcfs_nid2str(gw->lp_nid), info->pi_magic);
667 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
671 gw->lp_ping_feats = info->pi_features;
672 if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
673 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
674 libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
675 return; /* nothing I can understand */
678 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
679 return; /* can't carry NI status info */
681 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
686 if ((gw->lp_ping_feats & LNET_PING_FEAT_RTE_DISABLED) != 0) {
691 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
692 struct lnet_ni_status *stat = &info->pi_ni[i];
693 lnet_nid_t nid = stat->ns_nid;
695 if (nid == LNET_NID_ANY) {
696 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
697 libcfs_nid2str(gw->lp_nid));
698 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
702 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
705 if (stat->ns_status == LNET_NI_STATUS_DOWN) {
710 if (stat->ns_status == LNET_NI_STATUS_UP) {
711 if (LNET_NIDNET(nid) == rte->lr_net) {
718 CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
719 libcfs_nid2str(gw->lp_nid), stat->ns_status);
720 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
724 if (up) { /* ignore downed NIs if NI for dest network is up */
728 /* if @down is zero and this route is single-hop, it means
729 * we can't find NI for target network */
730 if (down == 0 && rte->lr_hops == 1)
733 rte->lr_downis = down;
738 lnet_router_checker_event(lnet_event_t *event)
740 lnet_rc_data_t *rcd = event->md.user_ptr;
741 struct lnet_peer *lp;
743 LASSERT(rcd != NULL);
745 if (event->unlinked) {
746 LNetInvalidateHandle(&rcd->rcd_mdh);
750 LASSERT(event->type == LNET_EVENT_SEND ||
751 event->type == LNET_EVENT_REPLY);
753 lp = rcd->rcd_gateway;
756 /* NB: it's called with holding lnet_res_lock, we have a few
757 * places need to hold both locks at the same time, please take
758 * care of lock ordering */
759 lnet_net_lock(lp->lp_cpt);
760 if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
761 /* ignore if no longer a router or rcd is replaced */
765 if (event->type == LNET_EVENT_SEND) {
766 lp->lp_ping_notsent = 0;
767 if (event->status == 0)
771 /* LNET_EVENT_REPLY */
772 /* A successful REPLY means the router is up. If _any_ comms
773 * to the router fail I assume it's down (this will happen if
774 * we ping alive routers to try to detect router death before
775 * apps get burned). */
777 lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
778 /* The router checker will wake up very shortly and do the
779 * actual notification.
780 * XXX If 'lp' stops being a router before then, it will still
781 * have the notification pending!!! */
783 if (avoid_asym_router_failure && event->status == 0)
784 lnet_parse_rc_info(rcd);
787 lnet_net_unlock(lp->lp_cpt);
791 lnet_wait_known_routerstate(void)
794 struct list_head *entry;
797 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
800 int cpt = lnet_net_lock_current();
803 list_for_each(entry, &the_lnet.ln_routers) {
804 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
806 if (rtr->lp_alive_count == 0) {
812 lnet_net_unlock(cpt);
817 set_current_state(TASK_UNINTERRUPTIBLE);
818 schedule_timeout(cfs_time_seconds(1));
823 lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
827 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
828 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
829 if (rte->lr_net == net) {
838 lnet_update_ni_status_locked(void)
844 LASSERT(the_lnet.ln_routing);
846 timeout = router_ping_timeout +
847 MAX(live_router_check_interval, dead_router_check_interval);
849 now = ktime_get_real_seconds();
850 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
851 if (ni->ni_lnd->lnd_type == LOLND)
854 if (now < ni->ni_last_alive + timeout)
858 /* re-check with lock */
859 if (now < ni->ni_last_alive + timeout) {
864 LASSERT(ni->ni_status != NULL);
866 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
867 CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
868 libcfs_nid2str(ni->ni_nid), timeout);
869 /* NB: so far, this is the only place to set
870 * NI status to "down" */
871 ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
878 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
880 LASSERT(list_empty(&rcd->rcd_list));
881 /* detached from network */
882 LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
884 if (rcd->rcd_gateway != NULL) {
885 int cpt = rcd->rcd_gateway->lp_cpt;
888 lnet_peer_decref_locked(rcd->rcd_gateway);
889 lnet_net_unlock(cpt);
892 if (rcd->rcd_pinginfo != NULL)
893 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
895 LIBCFS_FREE(rcd, sizeof(*rcd));
898 static lnet_rc_data_t *
899 lnet_create_rc_data_locked(lnet_peer_t *gateway)
901 lnet_rc_data_t *rcd = NULL;
902 struct lnet_ping_info *pi;
906 lnet_net_unlock(gateway->lp_cpt);
908 LIBCFS_ALLOC(rcd, sizeof(*rcd));
912 LNetInvalidateHandle(&rcd->rcd_mdh);
913 INIT_LIST_HEAD(&rcd->rcd_list);
915 LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
919 for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
920 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
921 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
923 rcd->rcd_pinginfo = pi;
925 LASSERT(!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
926 rc = LNetMDBind((lnet_md_t){.start = pi,
928 .length = LNET_PINGINFO_SIZE,
929 .threshold = LNET_MD_THRESH_INF,
930 .options = LNET_MD_TRUNCATE,
931 .eq_handle = the_lnet.ln_rc_eqh},
935 CERROR("Can't bind MD: %d\n", rc);
940 lnet_net_lock(gateway->lp_cpt);
941 /* router table changed or someone has created rcd for this gateway */
942 if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
943 lnet_net_unlock(gateway->lp_cpt);
947 lnet_peer_addref_locked(gateway);
948 rcd->rcd_gateway = gateway;
949 gateway->lp_rcd = rcd;
950 gateway->lp_ping_notsent = 0;
956 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
957 rc = LNetMDUnlink(rcd->rcd_mdh);
960 lnet_destroy_rc_data(rcd);
963 lnet_net_lock(gateway->lp_cpt);
964 return gateway->lp_rcd;
968 lnet_router_check_interval (lnet_peer_t *rtr)
972 secs = rtr->lp_alive ? live_router_check_interval :
973 dead_router_check_interval;
981 lnet_ping_router_locked (lnet_peer_t *rtr)
983 lnet_rc_data_t *rcd = NULL;
984 cfs_time_t now = cfs_time_current();
987 lnet_peer_addref_locked(rtr);
989 if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
990 cfs_time_after(now, rtr->lp_ping_deadline))
991 lnet_notify_locked(rtr, 1, 0, now);
993 /* Run any outstanding notifications */
994 lnet_ni_notify_locked(rtr->lp_ni, rtr);
996 if (!lnet_isrouter(rtr) ||
997 the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
998 /* router table changed or router checker is shutting down */
999 lnet_peer_decref_locked(rtr);
1003 rcd = rtr->lp_rcd != NULL ?
1004 rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
1009 secs = lnet_router_check_interval(rtr);
1012 "rtr %s %d: deadline %lu ping_notsent %d alive %d "
1013 "alive_count %d lp_ping_timestamp %lu\n",
1014 libcfs_nid2str(rtr->lp_nid), secs,
1015 rtr->lp_ping_deadline, rtr->lp_ping_notsent,
1016 rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
1018 if (secs != 0 && !rtr->lp_ping_notsent &&
1019 cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
1020 cfs_time_seconds(secs)))) {
1022 lnet_process_id_t id;
1023 lnet_handle_md_t mdh;
1025 id.nid = rtr->lp_nid;
1026 id.pid = LNET_PID_LUSTRE;
1027 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
1029 rtr->lp_ping_notsent = 1;
1030 rtr->lp_ping_timestamp = now;
1034 if (rtr->lp_ping_deadline == 0) {
1035 rtr->lp_ping_deadline =
1036 cfs_time_shift(router_ping_timeout);
1039 lnet_net_unlock(rtr->lp_cpt);
1041 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
1042 LNET_PROTO_PING_MATCHBITS, 0);
1044 lnet_net_lock(rtr->lp_cpt);
1046 rtr->lp_ping_notsent = 0; /* no event pending */
1049 lnet_peer_decref_locked(rtr);
1054 lnet_router_checker_start(void)
1058 struct task_struct *task;
1060 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1062 if (check_routers_before_use &&
1063 dead_router_check_interval <= 0) {
1064 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
1065 " set if 'check_routers_before_use' is set"
1070 sema_init(&the_lnet.ln_rc_signal, 0);
1072 rc = LNetEQAlloc(0, lnet_router_checker_event, &the_lnet.ln_rc_eqh);
1074 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1078 the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1079 task = kthread_run(lnet_router_checker, NULL, "router_checker");
1082 CERROR("Can't start router checker thread: %d\n", rc);
1083 /* block until event callback signals exit */
1084 down(&the_lnet.ln_rc_signal);
1085 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1087 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1091 if (check_routers_before_use) {
1092 /* Note that a helpful side-effect of pinging all known routers
1093 * at startup is that it makes them drop stale connections they
1094 * may have to a previous instance of me. */
1095 lnet_wait_known_routerstate();
1102 lnet_router_checker_stop (void)
1106 if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1109 LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1110 the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1111 /* wakeup the RC thread if it's sleeping */
1112 wake_up(&the_lnet.ln_rc_waitq);
1114 /* block until event callback signals exit */
1115 down(&the_lnet.ln_rc_signal);
1116 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1118 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1124 lnet_prune_rc_data(int wait_unlink)
1126 lnet_rc_data_t *rcd;
1127 lnet_rc_data_t *tmp;
1129 struct list_head head;
1132 if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1133 list_empty(&the_lnet.ln_rcd_deathrow) &&
1134 list_empty(&the_lnet.ln_rcd_zombie)))
1137 INIT_LIST_HEAD(&head);
1139 lnet_net_lock(LNET_LOCK_EX);
1141 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1142 /* router checker is stopping, prune all */
1143 list_for_each_entry(lp, &the_lnet.ln_routers,
1145 if (lp->lp_rcd == NULL)
1148 LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1149 list_add(&lp->lp_rcd->rcd_list,
1150 &the_lnet.ln_rcd_deathrow);
1155 /* unlink all RCDs on deathrow list */
1156 list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1158 if (!list_empty(&head)) {
1159 lnet_net_unlock(LNET_LOCK_EX);
1161 list_for_each_entry(rcd, &head, rcd_list)
1162 LNetMDUnlink(rcd->rcd_mdh);
1164 lnet_net_lock(LNET_LOCK_EX);
1167 list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1169 /* release all zombie RCDs */
1170 while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1171 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1173 if (LNetHandleIsInvalid(rcd->rcd_mdh))
1174 list_move(&rcd->rcd_list, &head);
1177 wait_unlink = wait_unlink &&
1178 !list_empty(&the_lnet.ln_rcd_zombie);
1180 lnet_net_unlock(LNET_LOCK_EX);
1182 while (!list_empty(&head)) {
1183 rcd = list_entry(head.next,
1184 lnet_rc_data_t, rcd_list);
1185 list_del_init(&rcd->rcd_list);
1186 lnet_destroy_rc_data(rcd);
1193 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1194 "Waiting for rc buffers to unlink\n");
1195 set_current_state(TASK_UNINTERRUPTIBLE);
1196 schedule_timeout(cfs_time_seconds(1) / 4);
1198 lnet_net_lock(LNET_LOCK_EX);
1201 lnet_net_unlock(LNET_LOCK_EX);
1205 * This function is called to check if the RC should block indefinitely.
1206 * It's called from lnet_router_checker() as well as being passed to
1207 * wait_event_interruptible() to avoid the lost wake_up problem.
1209 * When it's called from wait_event_interruptible() it is necessary to
1210 * also not sleep if the rc state is not running to avoid a deadlock
1211 * when the system is shutting down
1214 lnet_router_checker_active(void)
1216 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING)
1219 /* Router Checker thread needs to run when routing is enabled in
1220 * order to call lnet_update_ni_status_locked() */
1221 if (the_lnet.ln_routing)
1224 return !list_empty(&the_lnet.ln_routers) &&
1225 (live_router_check_interval > 0 ||
1226 dead_router_check_interval > 0);
1230 lnet_router_checker(void *arg)
1233 struct list_head *entry;
1235 cfs_block_allsigs();
1237 while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1242 cpt = lnet_net_lock_current();
1244 version = the_lnet.ln_routers_version;
1246 list_for_each(entry, &the_lnet.ln_routers) {
1247 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1249 cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1251 lnet_net_unlock(cpt);
1254 /* the routers list has changed */
1255 if (version != the_lnet.ln_routers_version)
1259 lnet_ping_router_locked(rtr);
1261 /* NB dropped lock */
1262 if (version != the_lnet.ln_routers_version) {
1263 /* the routers list has changed */
1268 if (the_lnet.ln_routing)
1269 lnet_update_ni_status_locked();
1271 lnet_net_unlock(cpt);
1273 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1275 /* Call schedule_timeout() here always adds 1 to load average
1276 * because kernel counts # active tasks as nr_running
1277 * + nr_uninterruptible. */
1278 /* if there are any routes then wakeup every second. If
1279 * there are no routes then sleep indefinitely until woken
1280 * up by a user adding a route */
1281 if (!lnet_router_checker_active())
1282 wait_event_interruptible(the_lnet.ln_rc_waitq,
1283 lnet_router_checker_active());
1285 wait_event_interruptible_timeout(the_lnet.ln_rc_waitq,
1287 cfs_time_seconds(1));
1290 lnet_prune_rc_data(1); /* wait for UNLINK */
1292 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1293 up(&the_lnet.ln_rc_signal);
1294 /* The unlink event callback will signal final completion */
1299 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1301 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1303 while (--npages >= 0)
1304 __free_page(rb->rb_kiov[npages].kiov_page);
1306 LIBCFS_FREE(rb, sz);
1309 static lnet_rtrbuf_t *
1310 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1312 int npages = rbp->rbp_npages;
1313 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1318 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1324 for (i = 0; i < npages; i++) {
1325 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1326 GFP_KERNEL | __GFP_ZERO);
1329 __free_page(rb->rb_kiov[i].kiov_page);
1331 LIBCFS_FREE(rb, sz);
1335 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
1336 rb->rb_kiov[i].kiov_offset = 0;
1337 rb->rb_kiov[i].kiov_page = page;
1344 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp, int cpt)
1346 int npages = rbp->rbp_npages;
1348 struct list_head tmp;
1350 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1353 INIT_LIST_HEAD(&tmp);
1356 lnet_drop_routed_msgs_locked(&rbp->rbp_msgs, cpt);
1357 list_splice_init(&rbp->rbp_bufs, &tmp);
1358 rbp->rbp_req_nbuffers = 0;
1359 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1360 rbp->rbp_mincredits = 0;
1361 lnet_net_unlock(cpt);
1363 /* Free buffers on the free list. */
1364 while (!list_empty(&tmp)) {
1365 rb = list_entry(tmp.next, lnet_rtrbuf_t, rb_list);
1366 list_del(&rb->rb_list);
1367 lnet_destroy_rtrbuf(rb, npages);
1372 lnet_rtrpool_adjust_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1374 struct list_head rb_list;
1377 int num_buffers = 0;
1379 int npages = rbp->rbp_npages;
1382 /* If we are called for less buffers than already in the pool, we
1383 * just lower the req_nbuffers number and excess buffers will be
1384 * thrown away as they are returned to the free list. Credits
1385 * then get adjusted as well.
1386 * If we already have enough buffers allocated to serve the
1387 * increase requested, then we can treat that the same way as we
1388 * do the decrease. */
1389 num_rb = nbufs - rbp->rbp_nbuffers;
1390 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1391 rbp->rbp_req_nbuffers = nbufs;
1392 lnet_net_unlock(cpt);
1395 /* store the older value of rbp_req_nbuffers and then set it to
1396 * the new request to prevent lnet_return_rx_credits_locked() from
1397 * freeing buffers that we need to keep around */
1398 old_req_nbufs = rbp->rbp_req_nbuffers;
1399 rbp->rbp_req_nbuffers = nbufs;
1400 lnet_net_unlock(cpt);
1402 INIT_LIST_HEAD(&rb_list);
1404 /* allocate the buffers on a local list first. If all buffers are
1405 * allocated successfully then join this list to the rbp buffer
1406 * list. If not then free all allocated buffers. */
1407 while (num_rb-- > 0) {
1408 rb = lnet_new_rtrbuf(rbp, cpt);
1410 CERROR("Failed to allocate %d route bufs of %d pages\n",
1414 rbp->rbp_req_nbuffers = old_req_nbufs;
1415 lnet_net_unlock(cpt);
1420 list_add(&rb->rb_list, &rb_list);
1426 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1427 rbp->rbp_nbuffers += num_buffers;
1428 rbp->rbp_credits += num_buffers;
1429 rbp->rbp_mincredits = rbp->rbp_credits;
1430 /* We need to schedule blocked msg using the newly
1432 while (!list_empty(&rbp->rbp_bufs) &&
1433 !list_empty(&rbp->rbp_msgs))
1434 lnet_schedule_blocked_locked(rbp);
1436 lnet_net_unlock(cpt);
1441 while (!list_empty(&rb_list)) {
1442 rb = list_entry(rb_list.next, lnet_rtrbuf_t, rb_list);
1443 list_del(&rb->rb_list);
1444 lnet_destroy_rtrbuf(rb, npages);
1451 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1453 INIT_LIST_HEAD(&rbp->rbp_msgs);
1454 INIT_LIST_HEAD(&rbp->rbp_bufs);
1456 rbp->rbp_npages = npages;
1457 rbp->rbp_credits = 0;
1458 rbp->rbp_mincredits = 0;
1462 lnet_rtrpools_free(int keep_pools)
1464 lnet_rtrbufpool_t *rtrp;
1467 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1470 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1471 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1472 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1473 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1477 cfs_percpt_free(the_lnet.ln_rtrpools);
1478 the_lnet.ln_rtrpools = NULL;
1483 lnet_nrb_tiny_calculate(void)
1485 int nrbs = LNET_NRB_TINY;
1487 if (tiny_router_buffers < 0) {
1488 LCONSOLE_ERROR_MSG(0x10c,
1489 "tiny_router_buffers=%d invalid when "
1490 "routing enabled\n", tiny_router_buffers);
1494 if (tiny_router_buffers > 0)
1495 nrbs = tiny_router_buffers;
1497 nrbs /= LNET_CPT_NUMBER;
1498 return max(nrbs, LNET_NRB_TINY_MIN);
1502 lnet_nrb_small_calculate(void)
1504 int nrbs = LNET_NRB_SMALL;
1506 if (small_router_buffers < 0) {
1507 LCONSOLE_ERROR_MSG(0x10c,
1508 "small_router_buffers=%d invalid when "
1509 "routing enabled\n", small_router_buffers);
1513 if (small_router_buffers > 0)
1514 nrbs = small_router_buffers;
1516 nrbs /= LNET_CPT_NUMBER;
1517 return max(nrbs, LNET_NRB_SMALL_MIN);
1521 lnet_nrb_large_calculate(void)
1523 int nrbs = LNET_NRB_LARGE;
1525 if (large_router_buffers < 0) {
1526 LCONSOLE_ERROR_MSG(0x10c,
1527 "large_router_buffers=%d invalid when "
1528 "routing enabled\n", large_router_buffers);
1532 if (large_router_buffers > 0)
1533 nrbs = large_router_buffers;
1535 nrbs /= LNET_CPT_NUMBER;
1536 return max(nrbs, LNET_NRB_LARGE_MIN);
1540 lnet_rtrpools_alloc(int im_a_router)
1542 lnet_rtrbufpool_t *rtrp;
1549 if (!strcmp(forwarding, "")) {
1550 /* not set either way */
1553 } else if (!strcmp(forwarding, "disabled")) {
1554 /* explicitly disabled */
1556 } else if (!strcmp(forwarding, "enabled")) {
1557 /* explicitly enabled */
1559 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1560 "'enabled' or 'disabled'\n");
1564 nrb_tiny = lnet_nrb_tiny_calculate();
1568 nrb_small = lnet_nrb_small_calculate();
1572 nrb_large = lnet_nrb_large_calculate();
1576 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1578 sizeof(lnet_rtrbufpool_t));
1579 if (the_lnet.ln_rtrpools == NULL) {
1580 LCONSOLE_ERROR_MSG(0x10c,
1581 "Failed to initialize router buffe pool\n");
1585 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1586 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1587 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1592 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1593 LNET_NRB_SMALL_PAGES);
1594 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1599 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1600 LNET_NRB_LARGE_PAGES);
1601 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1607 lnet_net_lock(LNET_LOCK_EX);
1608 the_lnet.ln_routing = 1;
1609 lnet_net_unlock(LNET_LOCK_EX);
1613 lnet_rtrpools_free(0);
1618 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1623 lnet_rtrbufpool_t *rtrp;
1625 /* If the provided values for each buffer pool are different than the
1626 * configured values, we need to take action. */
1628 tiny_router_buffers = tiny;
1629 nrb = lnet_nrb_tiny_calculate();
1630 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1631 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1638 small_router_buffers = small;
1639 nrb = lnet_nrb_small_calculate();
1640 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1641 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1648 large_router_buffers = large;
1649 nrb = lnet_nrb_large_calculate();
1650 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1651 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1662 lnet_rtrpools_adjust(int tiny, int small, int large)
1664 /* this function doesn't revert the changes if adding new buffers
1665 * failed. It's up to the user space caller to revert the
1668 if (!the_lnet.ln_routing)
1671 return lnet_rtrpools_adjust_helper(tiny, small, large);
1675 lnet_rtrpools_enable(void)
1679 if (the_lnet.ln_routing)
1682 if (the_lnet.ln_rtrpools == NULL)
1683 /* If routing is turned off, and we have never
1684 * initialized the pools before, just call the
1685 * standard buffer pool allocation routine as
1686 * if we are just configuring this for the first
1688 rc = lnet_rtrpools_alloc(1);
1690 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1694 lnet_net_lock(LNET_LOCK_EX);
1695 the_lnet.ln_routing = 1;
1697 the_lnet.ln_ping_info->pi_features &= ~LNET_PING_FEAT_RTE_DISABLED;
1698 lnet_net_unlock(LNET_LOCK_EX);
1704 lnet_rtrpools_disable(void)
1706 if (!the_lnet.ln_routing)
1709 lnet_net_lock(LNET_LOCK_EX);
1710 the_lnet.ln_routing = 0;
1711 the_lnet.ln_ping_info->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1713 tiny_router_buffers = 0;
1714 small_router_buffers = 0;
1715 large_router_buffers = 0;
1716 lnet_net_unlock(LNET_LOCK_EX);
1717 lnet_rtrpools_free(1);
1721 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1723 struct lnet_peer *lp = NULL;
1724 cfs_time_t now = cfs_time_current();
1725 int cpt = lnet_cpt_of_nid(nid);
1727 LASSERT (!in_interrupt ());
1729 CDEBUG (D_NET, "%s notifying %s: %s\n",
1730 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1731 libcfs_nid2str(nid),
1732 alive ? "up" : "down");
1735 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1736 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1737 libcfs_nid2str(nid), alive ? "birth" : "death",
1738 libcfs_nid2str(ni->ni_nid));
1742 /* can't do predictions... */
1743 if (cfs_time_after(when, now)) {
1744 CWARN("Ignoring prediction from %s of %s %s "
1745 "%ld seconds in the future\n",
1746 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1747 libcfs_nid2str(nid), alive ? "up" : "down",
1748 cfs_duration_sec(cfs_time_sub(when, now)));
1752 if (ni != NULL && !alive && /* LND telling me she's down */
1753 !auto_down) { /* auto-down disabled */
1754 CDEBUG(D_NET, "Auto-down disabled\n");
1760 if (the_lnet.ln_shutdown) {
1761 lnet_net_unlock(cpt);
1765 lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1768 lnet_net_unlock(cpt);
1769 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1773 /* We can't fully trust LND on reporting exact peer last_alive
1774 * if he notifies us about dead peer. For example ksocklnd can
1775 * call us with when == _time_when_the_node_was_booted_ if
1776 * no connections were successfully established */
1777 if (ni != NULL && !alive && when < lp->lp_last_alive)
1778 when = lp->lp_last_alive;
1780 lnet_notify_locked(lp, ni == NULL, alive, when);
1783 lnet_ni_notify_locked(ni, lp);
1785 lnet_peer_decref_locked(lp);
1787 lnet_net_unlock(cpt);
1790 EXPORT_SYMBOL(lnet_notify);