2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
4 * Copyright (c) 2011, 2013, Intel Corporation.
6 * This file is part of Portals
7 * http://sourceforge.net/projects/sandiaportals/
9 * Portals is free software; you can redistribute it and/or
10 * modify it under the terms of version 2 of the GNU General Public
11 * License as published by the Free Software Foundation.
13 * Portals is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with Portals; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_LNET
25 #include <lnet/lib-lnet.h>
27 #if defined(__KERNEL__) && defined(LNET_ROUTER)
29 #define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
30 #define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4)
31 #define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */
32 #define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
33 #define LNET_NRB_SMALL_PAGES 1
34 #define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
35 #define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
36 #define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_CACHE_SIZE - 1) >> \
39 static char *forwarding = "";
40 CFS_MODULE_PARM(forwarding, "s", charp, 0444,
41 "Explicitly enable/disable forwarding between networks");
43 static int tiny_router_buffers;
44 CFS_MODULE_PARM(tiny_router_buffers, "i", int, 0444,
45 "# of 0 payload messages to buffer in the router");
46 static int small_router_buffers;
47 CFS_MODULE_PARM(small_router_buffers, "i", int, 0444,
48 "# of small (1 page) messages to buffer in the router");
49 static int large_router_buffers;
50 CFS_MODULE_PARM(large_router_buffers, "i", int, 0444,
51 "# of large messages to buffer in the router");
52 static int peer_buffer_credits = 0;
53 CFS_MODULE_PARM(peer_buffer_credits, "i", int, 0444,
54 "# router buffer credits per peer");
56 static int auto_down = 1;
57 CFS_MODULE_PARM(auto_down, "i", int, 0444,
58 "Automatically mark peers down on comms error");
61 lnet_peer_buffer_credits(lnet_ni_t *ni)
63 /* NI option overrides LNet default */
64 if (ni->ni_peerrtrcredits > 0)
65 return ni->ni_peerrtrcredits;
66 if (peer_buffer_credits > 0)
67 return peer_buffer_credits;
69 /* As an approximation, allow this peer the same number of router
70 * buffers as it is allowed outstanding sends */
71 return ni->ni_peertxcredits;
75 static int lnet_router_checker(void *);
79 lnet_peer_buffer_credits(lnet_ni_t *ni)
86 static int check_routers_before_use = 0;
87 CFS_MODULE_PARM(check_routers_before_use, "i", int, 0444,
88 "Assume routers are down and ping them before use");
90 static int avoid_asym_router_failure = 1;
91 CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0644,
92 "Avoid asymmetrical router failures (0 to disable)");
94 static int dead_router_check_interval = 60;
95 CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0644,
96 "Seconds between dead router health checks (<= 0 to disable)");
98 static int live_router_check_interval = 60;
99 CFS_MODULE_PARM(live_router_check_interval, "i", int, 0644,
100 "Seconds between live router health checks (<= 0 to disable)");
102 static int router_ping_timeout = 50;
103 CFS_MODULE_PARM(router_ping_timeout, "i", int, 0644,
104 "Seconds to wait for the reply to a router health query");
107 lnet_peers_start_down(void)
109 return check_routers_before_use;
113 lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when)
115 if (cfs_time_before(when, lp->lp_timestamp)) { /* out of date information */
116 CDEBUG(D_NET, "Out of date\n");
120 lp->lp_timestamp = when; /* update timestamp */
121 lp->lp_ping_deadline = 0; /* disable ping timeout */
123 if (lp->lp_alive_count != 0 && /* got old news */
124 (!lp->lp_alive) == (!alive)) { /* new date for old news */
125 CDEBUG(D_NET, "Old news\n");
129 /* Flag that notification is outstanding */
131 lp->lp_alive_count++;
132 lp->lp_alive = !(!alive); /* 1 bit! */
134 lp->lp_notifylnd |= notifylnd;
136 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
138 CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
142 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
147 /* Notify only in 1 thread at any time to ensure ordered notification.
148 * NB individual events can be missed; the only guarantee is that you
149 * always get the most recent news */
151 if (lp->lp_notifying)
154 lp->lp_notifying = 1;
156 while (lp->lp_notify) {
157 alive = lp->lp_alive;
158 notifylnd = lp->lp_notifylnd;
160 lp->lp_notifylnd = 0;
163 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
164 lnet_net_unlock(lp->lp_cpt);
166 /* A new notification could happen now; I'll handle it
167 * when control returns to me */
169 (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
171 lnet_net_lock(lp->lp_cpt);
175 lp->lp_notifying = 0;
180 lnet_rtr_addref_locked(lnet_peer_t *lp)
182 LASSERT(lp->lp_refcount > 0);
183 LASSERT(lp->lp_rtr_refcount >= 0);
185 /* lnet_net_lock must be exclusively locked */
186 lp->lp_rtr_refcount++;
187 if (lp->lp_rtr_refcount == 1) {
188 struct list_head *pos;
190 /* a simple insertion sort */
191 list_for_each_prev(pos, &the_lnet.ln_routers) {
192 lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
195 if (rtr->lp_nid < lp->lp_nid)
199 list_add(&lp->lp_rtr_list, pos);
200 /* addref for the_lnet.ln_routers */
201 lnet_peer_addref_locked(lp);
202 the_lnet.ln_routers_version++;
207 lnet_rtr_decref_locked(lnet_peer_t *lp)
209 LASSERT(lp->lp_refcount > 0);
210 LASSERT(lp->lp_rtr_refcount > 0);
212 /* lnet_net_lock must be exclusively locked */
213 lp->lp_rtr_refcount--;
214 if (lp->lp_rtr_refcount == 0) {
215 LASSERT(list_empty(&lp->lp_routes));
217 if (lp->lp_rcd != NULL) {
218 list_add(&lp->lp_rcd->rcd_list,
219 &the_lnet.ln_rcd_deathrow);
223 list_del(&lp->lp_rtr_list);
224 /* decref for the_lnet.ln_routers */
225 lnet_peer_decref_locked(lp);
226 the_lnet.ln_routers_version++;
231 lnet_find_net_locked (__u32 net)
233 lnet_remotenet_t *rnet;
234 struct list_head *tmp;
235 struct list_head *rn_list;
237 LASSERT(!the_lnet.ln_shutdown);
239 rn_list = lnet_net2rnethash(net);
240 list_for_each(tmp, rn_list) {
241 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
243 if (rnet->lrn_net == net)
249 static void lnet_shuffle_seed(void)
251 static int seeded = 0;
252 int lnd_type, seed[2];
255 struct list_head *tmp;
260 cfs_get_random_bytes(seed, sizeof(seed));
262 /* Nodes with small feet have little entropy
263 * the NID for this node gives the most entropy in the low bits */
264 list_for_each(tmp, &the_lnet.ln_nis) {
265 ni = list_entry(tmp, lnet_ni_t, ni_list);
266 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
268 if (lnd_type != LOLND)
269 seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
272 do_gettimeofday(&tv);
273 cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
278 /* NB expects LNET_LOCK held */
280 lnet_add_route_to_rnet (lnet_remotenet_t *rnet, lnet_route_t *route)
282 unsigned int len = 0;
283 unsigned int offset = 0;
288 list_for_each(e, &rnet->lrn_routes) {
292 /* len+1 positions to add a new entry, also prevents division by 0 */
293 offset = cfs_rand() % (len + 1);
294 list_for_each(e, &rnet->lrn_routes) {
299 list_add(&route->lr_list, e);
300 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
302 the_lnet.ln_remote_nets_version++;
303 lnet_rtr_addref_locked(route->lr_gateway);
307 lnet_add_route(__u32 net, unsigned int hops, lnet_nid_t gateway,
308 unsigned int priority)
311 lnet_remotenet_t *rnet;
312 lnet_remotenet_t *rnet2;
318 CDEBUG(D_NET, "Add route: net %s hops %u priority %u gw %s\n",
319 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
321 if (gateway == LNET_NID_ANY ||
322 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
323 net == LNET_NIDNET(LNET_NID_ANY) ||
324 LNET_NETTYP(net) == LOLND ||
325 LNET_NIDNET(gateway) == net ||
326 hops < 1 || hops > 255)
329 if (lnet_islocalnet(net)) /* it's a local network */
330 return 0; /* ignore the route entry */
332 /* Assume net, route, all new */
333 LIBCFS_ALLOC(route, sizeof(*route));
334 LIBCFS_ALLOC(rnet, sizeof(*rnet));
335 if (route == NULL || rnet == NULL) {
336 CERROR("Out of memory creating route %s %d %s\n",
337 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
339 LIBCFS_FREE(route, sizeof(*route));
341 LIBCFS_FREE(rnet, sizeof(*rnet));
345 INIT_LIST_HEAD(&rnet->lrn_routes);
347 route->lr_hops = hops;
349 route->lr_priority = priority;
351 lnet_net_lock(LNET_LOCK_EX);
353 rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
355 lnet_net_unlock(LNET_LOCK_EX);
357 LIBCFS_FREE(route, sizeof(*route));
358 LIBCFS_FREE(rnet, sizeof(*rnet));
360 if (rc == -EHOSTUNREACH) /* gateway is not on a local net. */
361 return 0; /* ignore the route entry */
362 CERROR("Error %d creating route %s %d %s\n", rc,
363 libcfs_net2str(net), hops,
364 libcfs_nid2str(gateway));
368 LASSERT(!the_lnet.ln_shutdown);
370 rnet2 = lnet_find_net_locked(net);
373 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
377 /* Search for a duplicate route (it's a NOOP if it is) */
379 list_for_each(e, &rnet2->lrn_routes) {
380 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
382 if (route2->lr_gateway == route->lr_gateway) {
387 /* our lookups must be true */
388 LASSERT(route2->lr_gateway->lp_nid != gateway);
392 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
393 lnet_add_route_to_rnet(rnet2, route);
395 ni = route->lr_gateway->lp_ni;
396 lnet_net_unlock(LNET_LOCK_EX);
398 /* XXX Assume alive */
399 if (ni->ni_lnd->lnd_notify != NULL)
400 (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
402 lnet_net_lock(LNET_LOCK_EX);
405 /* -1 for notify or !add_route */
406 lnet_peer_decref_locked(route->lr_gateway);
407 lnet_net_unlock(LNET_LOCK_EX);
410 LIBCFS_FREE(route, sizeof(*route));
413 LIBCFS_FREE(rnet, sizeof(*rnet));
419 lnet_check_routes(void)
421 lnet_remotenet_t *rnet;
423 lnet_route_t *route2;
424 struct list_head *e1;
425 struct list_head *e2;
427 struct list_head *rn_list;
430 cpt = lnet_net_lock_current();
432 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
433 rn_list = &the_lnet.ln_remote_nets_hash[i];
434 list_for_each(e1, rn_list) {
435 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
438 list_for_each(e2, &rnet->lrn_routes) {
443 route = list_entry(e2, lnet_route_t,
446 if (route2 == NULL) {
451 if (route->lr_gateway->lp_ni ==
452 route2->lr_gateway->lp_ni)
455 nid1 = route->lr_gateway->lp_nid;
456 nid2 = route2->lr_gateway->lp_nid;
459 lnet_net_unlock(cpt);
461 CERROR("Routes to %s via %s and %s not "
464 libcfs_nid2str(nid1),
465 libcfs_nid2str(nid2));
471 lnet_net_unlock(cpt);
476 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
478 struct lnet_peer *gateway;
479 lnet_remotenet_t *rnet;
481 struct list_head *e1;
482 struct list_head *e2;
484 struct list_head *rn_list;
487 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
488 libcfs_net2str(net), libcfs_nid2str(gw_nid));
490 /* NB Caller may specify either all routes via the given gateway
491 * or a specific route entry actual NIDs) */
493 lnet_net_lock(LNET_LOCK_EX);
494 if (net == LNET_NIDNET(LNET_NID_ANY))
495 rn_list = &the_lnet.ln_remote_nets_hash[0];
497 rn_list = lnet_net2rnethash(net);
500 list_for_each(e1, rn_list) {
501 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
503 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
504 net == rnet->lrn_net))
507 list_for_each(e2, &rnet->lrn_routes) {
508 route = list_entry(e2, lnet_route_t, lr_list);
510 gateway = route->lr_gateway;
511 if (!(gw_nid == LNET_NID_ANY ||
512 gw_nid == gateway->lp_nid))
515 list_del(&route->lr_list);
516 list_del(&route->lr_gwlist);
517 the_lnet.ln_remote_nets_version++;
519 if (list_empty(&rnet->lrn_routes))
520 list_del(&rnet->lrn_list);
524 lnet_rtr_decref_locked(gateway);
525 lnet_peer_decref_locked(gateway);
527 lnet_net_unlock(LNET_LOCK_EX);
529 LIBCFS_FREE(route, sizeof(*route));
532 LIBCFS_FREE(rnet, sizeof(*rnet));
535 lnet_net_lock(LNET_LOCK_EX);
540 if (net == LNET_NIDNET(LNET_NID_ANY) &&
541 ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
542 rn_list = &the_lnet.ln_remote_nets_hash[idx];
545 lnet_net_unlock(LNET_LOCK_EX);
551 lnet_destroy_routes (void)
553 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
557 lnet_get_route(int idx, __u32 *net, __u32 *hops,
558 lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
560 struct list_head *e1;
561 struct list_head *e2;
562 lnet_remotenet_t *rnet;
566 struct list_head *rn_list;
568 cpt = lnet_net_lock_current();
570 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
571 rn_list = &the_lnet.ln_remote_nets_hash[i];
572 list_for_each(e1, rn_list) {
573 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
575 list_for_each(e2, &rnet->lrn_routes) {
576 route = list_entry(e2, lnet_route_t,
580 *net = rnet->lrn_net;
581 *hops = route->lr_hops;
582 *priority = route->lr_priority;
583 *gateway = route->lr_gateway->lp_nid;
585 route->lr_gateway->lp_alive &&
587 lnet_net_unlock(cpt);
594 lnet_net_unlock(cpt);
599 lnet_swap_pinginfo(lnet_ping_info_t *info)
602 lnet_ni_status_t *stat;
604 __swab32s(&info->pi_magic);
605 __swab32s(&info->pi_features);
606 __swab32s(&info->pi_pid);
607 __swab32s(&info->pi_nnis);
608 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
609 stat = &info->pi_ni[i];
610 __swab64s(&stat->ns_nid);
611 __swab32s(&stat->ns_status);
617 * parse router-checker pinginfo, record number of down NIs for remote
618 * networks on that router.
621 lnet_parse_rc_info(lnet_rc_data_t *rcd)
623 lnet_ping_info_t *info = rcd->rcd_pinginfo;
624 struct lnet_peer *gw = rcd->rcd_gateway;
630 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
631 lnet_swap_pinginfo(info);
633 /* NB always racing with network! */
634 if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
635 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
636 libcfs_nid2str(gw->lp_nid), info->pi_magic);
637 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
641 gw->lp_ping_feats = info->pi_features;
642 if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
643 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
644 libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
645 return; /* nothing I can understand */
648 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
649 return; /* can't carry NI status info */
651 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
656 if ((gw->lp_ping_feats & LNET_PING_FEAT_RTE_DISABLED) != 0) {
661 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
662 lnet_ni_status_t *stat = &info->pi_ni[i];
663 lnet_nid_t nid = stat->ns_nid;
665 if (nid == LNET_NID_ANY) {
666 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
667 libcfs_nid2str(gw->lp_nid));
668 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
672 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
675 if (stat->ns_status == LNET_NI_STATUS_DOWN) {
680 if (stat->ns_status == LNET_NI_STATUS_UP) {
681 if (LNET_NIDNET(nid) == rte->lr_net) {
688 CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
689 libcfs_nid2str(gw->lp_nid), stat->ns_status);
690 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
694 if (up) { /* ignore downed NIs if NI for dest network is up */
698 rte->lr_downis = down;
703 lnet_router_checker_event(lnet_event_t *event)
705 lnet_rc_data_t *rcd = event->md.user_ptr;
706 struct lnet_peer *lp;
708 LASSERT(rcd != NULL);
710 if (event->unlinked) {
711 LNetInvalidateHandle(&rcd->rcd_mdh);
715 LASSERT(event->type == LNET_EVENT_SEND ||
716 event->type == LNET_EVENT_REPLY);
718 lp = rcd->rcd_gateway;
721 /* NB: it's called with holding lnet_res_lock, we have a few
722 * places need to hold both locks at the same time, please take
723 * care of lock ordering */
724 lnet_net_lock(lp->lp_cpt);
725 if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
726 /* ignore if no longer a router or rcd is replaced */
730 if (event->type == LNET_EVENT_SEND) {
731 lp->lp_ping_notsent = 0;
732 if (event->status == 0)
736 /* LNET_EVENT_REPLY */
737 /* A successful REPLY means the router is up. If _any_ comms
738 * to the router fail I assume it's down (this will happen if
739 * we ping alive routers to try to detect router death before
740 * apps get burned). */
742 lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
743 /* The router checker will wake up very shortly and do the
744 * actual notification.
745 * XXX If 'lp' stops being a router before then, it will still
746 * have the notification pending!!! */
748 if (avoid_asym_router_failure && event->status == 0)
749 lnet_parse_rc_info(rcd);
752 lnet_net_unlock(lp->lp_cpt);
756 lnet_wait_known_routerstate(void)
759 struct list_head *entry;
762 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
765 int cpt = lnet_net_lock_current();
768 list_for_each(entry, &the_lnet.ln_routers) {
769 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
771 if (rtr->lp_alive_count == 0) {
777 lnet_net_unlock(cpt);
783 lnet_router_checker();
785 cfs_pause(cfs_time_seconds(1));
790 lnet_update_ni_status_locked(void)
796 LASSERT(the_lnet.ln_routing);
798 timeout = router_ping_timeout +
799 MAX(live_router_check_interval, dead_router_check_interval);
801 now = cfs_time_current_sec();
802 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
803 if (ni->ni_lnd->lnd_type == LOLND)
806 if (now < ni->ni_last_alive + timeout)
810 /* re-check with lock */
811 if (now < ni->ni_last_alive + timeout) {
816 LASSERT(ni->ni_status != NULL);
818 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
819 CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
820 libcfs_nid2str(ni->ni_nid), timeout);
821 /* NB: so far, this is the only place to set
822 * NI status to "down" */
823 ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
830 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
832 LASSERT(list_empty(&rcd->rcd_list));
833 /* detached from network */
834 LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
836 if (rcd->rcd_gateway != NULL) {
837 int cpt = rcd->rcd_gateway->lp_cpt;
840 lnet_peer_decref_locked(rcd->rcd_gateway);
841 lnet_net_unlock(cpt);
844 if (rcd->rcd_pinginfo != NULL)
845 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
847 LIBCFS_FREE(rcd, sizeof(*rcd));
851 lnet_create_rc_data_locked(lnet_peer_t *gateway)
853 lnet_rc_data_t *rcd = NULL;
854 lnet_ping_info_t *pi;
858 lnet_net_unlock(gateway->lp_cpt);
860 LIBCFS_ALLOC(rcd, sizeof(*rcd));
864 LNetInvalidateHandle(&rcd->rcd_mdh);
865 INIT_LIST_HEAD(&rcd->rcd_list);
867 LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
871 for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
872 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
873 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
875 rcd->rcd_pinginfo = pi;
877 LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
878 rc = LNetMDBind((lnet_md_t){.start = pi,
880 .length = LNET_PINGINFO_SIZE,
881 .threshold = LNET_MD_THRESH_INF,
882 .options = LNET_MD_TRUNCATE,
883 .eq_handle = the_lnet.ln_rc_eqh},
887 CERROR("Can't bind MD: %d\n", rc);
892 lnet_net_lock(gateway->lp_cpt);
893 /* router table changed or someone has created rcd for this gateway */
894 if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
895 lnet_net_unlock(gateway->lp_cpt);
899 lnet_peer_addref_locked(gateway);
900 rcd->rcd_gateway = gateway;
901 gateway->lp_rcd = rcd;
902 gateway->lp_ping_notsent = 0;
908 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
909 rc = LNetMDUnlink(rcd->rcd_mdh);
912 lnet_destroy_rc_data(rcd);
915 lnet_net_lock(gateway->lp_cpt);
916 return gateway->lp_rcd;
920 lnet_router_check_interval (lnet_peer_t *rtr)
924 secs = rtr->lp_alive ? live_router_check_interval :
925 dead_router_check_interval;
933 lnet_ping_router_locked (lnet_peer_t *rtr)
935 lnet_rc_data_t *rcd = NULL;
936 cfs_time_t now = cfs_time_current();
939 lnet_peer_addref_locked(rtr);
941 if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
942 cfs_time_after(now, rtr->lp_ping_deadline))
943 lnet_notify_locked(rtr, 1, 0, now);
945 /* Run any outstanding notifications */
946 lnet_ni_notify_locked(rtr->lp_ni, rtr);
948 if (!lnet_isrouter(rtr) ||
949 the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
950 /* router table changed or router checker is shutting down */
951 lnet_peer_decref_locked(rtr);
955 rcd = rtr->lp_rcd != NULL ?
956 rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
961 secs = lnet_router_check_interval(rtr);
964 "rtr %s %d: deadline %lu ping_notsent %d alive %d "
965 "alive_count %d lp_ping_timestamp %lu\n",
966 libcfs_nid2str(rtr->lp_nid), secs,
967 rtr->lp_ping_deadline, rtr->lp_ping_notsent,
968 rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
970 if (secs != 0 && !rtr->lp_ping_notsent &&
971 cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
972 cfs_time_seconds(secs)))) {
974 lnet_process_id_t id;
975 lnet_handle_md_t mdh;
977 id.nid = rtr->lp_nid;
978 id.pid = LUSTRE_SRV_LNET_PID;
979 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
981 rtr->lp_ping_notsent = 1;
982 rtr->lp_ping_timestamp = now;
986 if (rtr->lp_ping_deadline == 0) {
987 rtr->lp_ping_deadline =
988 cfs_time_shift(router_ping_timeout);
991 lnet_net_unlock(rtr->lp_cpt);
993 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
994 LNET_PROTO_PING_MATCHBITS, 0);
996 lnet_net_lock(rtr->lp_cpt);
998 rtr->lp_ping_notsent = 0; /* no event pending */
1001 lnet_peer_decref_locked(rtr);
1006 lnet_router_checker_start(void)
1011 struct task_struct *task;
1012 #else /* __KERNEL__ */
1016 int router_checker_max_eqsize = 10240;
1018 LASSERT (check_routers_before_use);
1019 LASSERT (dead_router_check_interval > 0);
1023 /* As an approximation, allow each router the same number of
1024 * outstanding events as it is allowed outstanding sends */
1026 version = the_lnet.ln_routers_version;
1027 list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
1028 lnet_ni_t *ni = rtr->lp_ni;
1029 lnet_process_id_t id;
1032 eqsz += ni->ni_peertxcredits;
1034 /* one async ping reply per router */
1035 id.nid = rtr->lp_nid;
1036 id.pid = LUSTRE_SRV_LNET_PID;
1040 rc = LNetSetAsync(id, 1);
1042 CWARN("LNetSetAsync %s failed: %d\n",
1043 libcfs_id2str(id), rc);
1048 /* NB router list doesn't change in userspace */
1049 LASSERT(version == the_lnet.ln_routers_version);
1056 "No router found, not starting router checker\n");
1060 /* at least allow a SENT and a REPLY per router */
1061 if (router_checker_max_eqsize < 2 * nrtr)
1062 router_checker_max_eqsize = 2 * nrtr;
1065 if (eqsz > router_checker_max_eqsize)
1066 eqsz = router_checker_max_eqsize;
1069 LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1071 if (check_routers_before_use &&
1072 dead_router_check_interval <= 0) {
1073 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
1074 " set if 'check_routers_before_use' is set"
1079 if (!the_lnet.ln_routing &&
1080 live_router_check_interval <= 0 &&
1081 dead_router_check_interval <= 0)
1085 sema_init(&the_lnet.ln_rc_signal, 0);
1086 /* EQ size doesn't matter; the callback is guaranteed to get every
1089 rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1090 &the_lnet.ln_rc_eqh);
1092 rc = LNetEQAlloc(eqsz, LNET_EQ_HANDLER_NONE,
1093 &the_lnet.ln_rc_eqh);
1096 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1100 the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1102 task = kthread_run(lnet_router_checker, NULL, "router_checker");
1105 CERROR("Can't start router checker thread: %d\n", rc);
1106 /* block until event callback signals exit */
1107 down(&the_lnet.ln_rc_signal);
1108 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1110 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1115 if (check_routers_before_use) {
1116 /* Note that a helpful side-effect of pinging all known routers
1117 * at startup is that it makes them drop stale connections they
1118 * may have to a previous instance of me. */
1119 lnet_wait_known_routerstate();
1126 lnet_router_checker_stop (void)
1130 if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1133 LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1134 the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1137 /* block until event callback signals exit */
1138 down(&the_lnet.ln_rc_signal);
1140 lnet_router_checker();
1142 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1144 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1150 lnet_prune_rc_data(int wait_unlink)
1152 lnet_rc_data_t *rcd;
1153 lnet_rc_data_t *tmp;
1155 struct list_head head;
1158 if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1159 list_empty(&the_lnet.ln_rcd_deathrow) &&
1160 list_empty(&the_lnet.ln_rcd_zombie)))
1163 INIT_LIST_HEAD(&head);
1165 lnet_net_lock(LNET_LOCK_EX);
1167 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1168 /* router checker is stopping, prune all */
1169 list_for_each_entry(lp, &the_lnet.ln_routers,
1171 if (lp->lp_rcd == NULL)
1174 LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1175 list_add(&lp->lp_rcd->rcd_list,
1176 &the_lnet.ln_rcd_deathrow);
1181 /* unlink all RCDs on deathrow list */
1182 list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1184 if (!list_empty(&head)) {
1185 lnet_net_unlock(LNET_LOCK_EX);
1187 list_for_each_entry(rcd, &head, rcd_list)
1188 LNetMDUnlink(rcd->rcd_mdh);
1190 lnet_net_lock(LNET_LOCK_EX);
1193 list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1195 /* release all zombie RCDs */
1196 while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1197 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1199 if (LNetHandleIsInvalid(rcd->rcd_mdh))
1200 list_move(&rcd->rcd_list, &head);
1203 wait_unlink = wait_unlink &&
1204 !list_empty(&the_lnet.ln_rcd_zombie);
1206 lnet_net_unlock(LNET_LOCK_EX);
1208 while (!list_empty(&head)) {
1209 rcd = list_entry(head.next,
1210 lnet_rc_data_t, rcd_list);
1211 list_del_init(&rcd->rcd_list);
1212 lnet_destroy_rc_data(rcd);
1219 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1220 "Waiting for rc buffers to unlink\n");
1221 cfs_pause(cfs_time_seconds(1) / 4);
1223 lnet_net_lock(LNET_LOCK_EX);
1226 lnet_net_unlock(LNET_LOCK_EX);
1230 #if defined(__KERNEL__) && defined(LNET_ROUTER)
1233 lnet_router_checker(void *arg)
1236 struct list_head *entry;
1238 cfs_block_allsigs();
1240 LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1242 while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1247 cpt = lnet_net_lock_current();
1249 version = the_lnet.ln_routers_version;
1251 list_for_each(entry, &the_lnet.ln_routers) {
1252 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1254 cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1256 lnet_net_unlock(cpt);
1259 /* the routers list has changed */
1260 if (version != the_lnet.ln_routers_version)
1264 lnet_ping_router_locked(rtr);
1266 /* NB dropped lock */
1267 if (version != the_lnet.ln_routers_version) {
1268 /* the routers list has changed */
1273 if (the_lnet.ln_routing)
1274 lnet_update_ni_status_locked();
1276 lnet_net_unlock(cpt);
1278 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1280 /* Call cfs_pause() here always adds 1 to load average
1281 * because kernel counts # active tasks as nr_running
1282 * + nr_uninterruptible. */
1283 schedule_timeout_and_set_state(TASK_INTERRUPTIBLE,
1284 cfs_time_seconds(1));
1287 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1289 lnet_prune_rc_data(1); /* wait for UNLINK */
1291 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1292 up(&the_lnet.ln_rc_signal);
1293 /* The unlink event callback will signal final completion */
1298 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1300 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1302 while (--npages >= 0)
1303 __free_page(rb->rb_kiov[npages].kiov_page);
1305 LIBCFS_FREE(rb, sz);
1309 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1311 int npages = rbp->rbp_npages;
1312 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1317 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1323 for (i = 0; i < npages; i++) {
1324 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1325 __GFP_ZERO | GFP_IOFS);
1328 __free_page(rb->rb_kiov[i].kiov_page);
1330 LIBCFS_FREE(rb, sz);
1334 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1335 rb->rb_kiov[i].kiov_offset = 0;
1336 rb->rb_kiov[i].kiov_page = page;
1343 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp, int cpt)
1345 int npages = rbp->rbp_npages;
1347 struct list_head tmp;
1349 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1352 INIT_LIST_HEAD(&tmp);
1355 lnet_drop_routed_msgs_locked(&rbp->rbp_msgs, cpt);
1356 list_splice_init(&rbp->rbp_bufs, &tmp);
1357 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1358 rbp->rbp_mincredits = 0;
1359 lnet_net_unlock(cpt);
1361 /* Free buffers on the free list. */
1362 while (!list_empty(&tmp)) {
1363 rb = list_entry(tmp.next, lnet_rtrbuf_t, rb_list);
1364 list_del(&rb->rb_list);
1365 lnet_destroy_rtrbuf(rb, npages);
1370 lnet_rtrpool_adjust_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1372 struct list_head rb_list;
1375 int num_buffers = 0;
1376 int npages = rbp->rbp_npages;
1378 /* If we are called for less buffers than already in the pool, we
1379 * just lower the nbuffers number and excess buffers will be
1380 * thrown away as they are returned to the free list. Credits
1381 * then get adjusted as well. */
1382 if (nbufs <= rbp->rbp_nbuffers) {
1384 rbp->rbp_nbuffers = nbufs;
1385 lnet_net_unlock(cpt);
1389 INIT_LIST_HEAD(&rb_list);
1391 /* allocate the buffers on a local list first. If all buffers are
1392 * allocated successfully then join this list to the rbp buffer
1393 * list. If not then free all allocated buffers. */
1394 num_rb = rbp->rbp_nbuffers;
1396 while (num_rb < nbufs) {
1397 rb = lnet_new_rtrbuf(rbp, cpt);
1399 CERROR("Failed to allocate %d route bufs of %d pages\n",
1404 list_add(&rb->rb_list, &rb_list);
1411 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1412 rbp->rbp_nbuffers += num_buffers;
1413 rbp->rbp_credits += num_buffers;
1414 rbp->rbp_mincredits = rbp->rbp_credits;
1415 /* We need to schedule blocked msg using the newly
1417 while (!list_empty(&rbp->rbp_bufs) &&
1418 !list_empty(&rbp->rbp_msgs))
1419 lnet_schedule_blocked_locked(rbp);
1421 lnet_net_unlock(cpt);
1426 while (!list_empty(&rb_list)) {
1427 rb = list_entry(rb_list.next, lnet_rtrbuf_t, rb_list);
1428 list_del(&rb->rb_list);
1429 lnet_destroy_rtrbuf(rb, npages);
1436 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1438 INIT_LIST_HEAD(&rbp->rbp_msgs);
1439 INIT_LIST_HEAD(&rbp->rbp_bufs);
1441 rbp->rbp_npages = npages;
1442 rbp->rbp_credits = 0;
1443 rbp->rbp_mincredits = 0;
1447 lnet_rtrpools_free(int keep_pools)
1449 lnet_rtrbufpool_t *rtrp;
1452 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1455 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1456 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1457 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1458 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1462 cfs_percpt_free(the_lnet.ln_rtrpools);
1463 the_lnet.ln_rtrpools = NULL;
1468 lnet_nrb_tiny_calculate(void)
1470 int nrbs = LNET_NRB_TINY;
1472 if (tiny_router_buffers < 0) {
1473 LCONSOLE_ERROR_MSG(0x10c,
1474 "tiny_router_buffers=%d invalid when "
1475 "routing enabled\n", tiny_router_buffers);
1479 if (tiny_router_buffers > 0)
1480 nrbs = tiny_router_buffers;
1482 nrbs /= LNET_CPT_NUMBER;
1483 return max(nrbs, LNET_NRB_TINY_MIN);
1487 lnet_nrb_small_calculate(void)
1489 int nrbs = LNET_NRB_SMALL;
1491 if (small_router_buffers < 0) {
1492 LCONSOLE_ERROR_MSG(0x10c,
1493 "small_router_buffers=%d invalid when "
1494 "routing enabled\n", small_router_buffers);
1498 if (small_router_buffers > 0)
1499 nrbs = small_router_buffers;
1501 nrbs /= LNET_CPT_NUMBER;
1502 return max(nrbs, LNET_NRB_SMALL_MIN);
1506 lnet_nrb_large_calculate(void)
1508 int nrbs = LNET_NRB_LARGE;
1510 if (large_router_buffers < 0) {
1511 LCONSOLE_ERROR_MSG(0x10c,
1512 "large_router_buffers=%d invalid when "
1513 "routing enabled\n", large_router_buffers);
1517 if (large_router_buffers > 0)
1518 nrbs = large_router_buffers;
1520 nrbs /= LNET_CPT_NUMBER;
1521 return max(nrbs, LNET_NRB_LARGE_MIN);
1525 lnet_rtrpools_alloc(int im_a_router)
1527 lnet_rtrbufpool_t *rtrp;
1534 if (!strcmp(forwarding, "")) {
1535 /* not set either way */
1538 } else if (!strcmp(forwarding, "disabled")) {
1539 /* explicitly disabled */
1541 } else if (!strcmp(forwarding, "enabled")) {
1542 /* explicitly enabled */
1544 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1545 "'enabled' or 'disabled'\n");
1549 nrb_tiny = lnet_nrb_tiny_calculate();
1553 nrb_small = lnet_nrb_small_calculate();
1557 nrb_large = lnet_nrb_large_calculate();
1561 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1563 sizeof(lnet_rtrbufpool_t));
1564 if (the_lnet.ln_rtrpools == NULL) {
1565 LCONSOLE_ERROR_MSG(0x10c,
1566 "Failed to initialize router buffe pool\n");
1570 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1571 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1572 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1577 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1578 LNET_NRB_SMALL_PAGES);
1579 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1584 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1585 LNET_NRB_LARGE_PAGES);
1586 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1592 lnet_net_lock(LNET_LOCK_EX);
1593 the_lnet.ln_routing = 1;
1594 lnet_net_unlock(LNET_LOCK_EX);
1598 lnet_rtrpools_free(0);
1603 lnet_rtrpools_adjust(int tiny, int small, int large)
1608 lnet_rtrbufpool_t *rtrp;
1610 /* this function doesn't revert the changes if adding new buffers
1611 * failed. It's up to the user space caller to revert the
1614 if (!the_lnet.ln_routing)
1617 /* If the provided values for each buffer pool are different than the
1618 * configured values, we need to take action. */
1619 if (tiny >= 0 && tiny != tiny_router_buffers) {
1620 tiny_router_buffers = tiny;
1621 nrb = lnet_nrb_tiny_calculate();
1622 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1623 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1629 if (small >= 0 && small != small_router_buffers) {
1630 small_router_buffers = small;
1631 nrb = lnet_nrb_small_calculate();
1632 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1633 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1639 if (large >= 0 && large != large_router_buffers) {
1640 large_router_buffers = large;
1641 nrb = lnet_nrb_large_calculate();
1642 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1643 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1654 lnet_rtrpools_enable(void)
1658 if (the_lnet.ln_routing)
1661 if (the_lnet.ln_rtrpools == NULL)
1662 /* If routing is turned off, and we have never
1663 * initialized the pools before, just call the
1664 * standard buffer pool allocation routine as
1665 * if we are just configuring this for the first
1667 return lnet_rtrpools_alloc(1);
1669 rc = lnet_rtrpools_adjust(0, 0, 0);
1673 lnet_net_lock(LNET_LOCK_EX);
1674 the_lnet.ln_routing = 1;
1676 the_lnet.ln_ping_info->pi_features &= ~LNET_PING_FEAT_RTE_DISABLED;
1677 lnet_net_unlock(LNET_LOCK_EX);
1683 lnet_rtrpools_disable(void)
1685 if (!the_lnet.ln_routing)
1688 lnet_net_lock(LNET_LOCK_EX);
1689 the_lnet.ln_routing = 0;
1690 the_lnet.ln_ping_info->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1692 tiny_router_buffers = 0;
1693 small_router_buffers = 0;
1694 large_router_buffers = 0;
1695 lnet_net_unlock(LNET_LOCK_EX);
1696 lnet_rtrpools_free(1);
1700 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1702 struct lnet_peer *lp = NULL;
1703 cfs_time_t now = cfs_time_current();
1704 int cpt = lnet_cpt_of_nid(nid);
1706 LASSERT (!in_interrupt ());
1708 CDEBUG (D_NET, "%s notifying %s: %s\n",
1709 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1710 libcfs_nid2str(nid),
1711 alive ? "up" : "down");
1714 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1715 CWARN ("Ignoring notification of %s %s by %s (different net)\n",
1716 libcfs_nid2str(nid), alive ? "birth" : "death",
1717 libcfs_nid2str(ni->ni_nid));
1721 /* can't do predictions... */
1722 if (cfs_time_after(when, now)) {
1723 CWARN ("Ignoring prediction from %s of %s %s "
1724 "%ld seconds in the future\n",
1725 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1726 libcfs_nid2str(nid), alive ? "up" : "down",
1727 cfs_duration_sec(cfs_time_sub(when, now)));
1731 if (ni != NULL && !alive && /* LND telling me she's down */
1732 !auto_down) { /* auto-down disabled */
1733 CDEBUG(D_NET, "Auto-down disabled\n");
1739 if (the_lnet.ln_shutdown) {
1740 lnet_net_unlock(cpt);
1744 lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1747 lnet_net_unlock(cpt);
1748 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1752 /* We can't fully trust LND on reporting exact peer last_alive
1753 * if he notifies us about dead peer. For example ksocklnd can
1754 * call us with when == _time_when_the_node_was_booted_ if
1755 * no connections were successfully established */
1756 if (ni != NULL && !alive && when < lp->lp_last_alive)
1757 when = lp->lp_last_alive;
1759 lnet_notify_locked(lp, ni == NULL, alive, when);
1762 lnet_ni_notify_locked(ni, lp);
1764 lnet_peer_decref_locked(lp);
1766 lnet_net_unlock(cpt);
1769 EXPORT_SYMBOL(lnet_notify);
1772 lnet_get_tunables (void)
1780 lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1786 lnet_router_checker (void)
1788 static time_t last = 0;
1789 static int running = 0;
1791 time_t now = cfs_time_current_sec();
1792 int interval = now - last;
1797 /* It's no use to call me again within a sec - all intervals and
1798 * timeouts are measured in seconds */
1799 if (last != 0 && interval < 2)
1803 interval > MAX(live_router_check_interval,
1804 dead_router_check_interval))
1805 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1806 live_router_check_interval, dead_router_check_interval,
1809 LASSERT(LNET_CPT_NUMBER == 1);
1812 LASSERT(!running); /* recursion check */
1818 if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1819 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1821 /* consume all pending events */
1826 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1827 * recursion breaker in LNetEQPoll would fail */
1828 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1829 if (rc == 0) /* no event pending */
1832 /* NB a lost SENT prevents me from pinging a router again */
1833 if (rc == -EOVERFLOW) {
1834 CERROR("Dropped an event!!!\n");
1840 lnet_router_checker_event(&ev);
1843 if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1844 lnet_prune_rc_data(1); /* release rcd */
1845 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1850 LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1854 version = the_lnet.ln_routers_version;
1855 list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
1856 lnet_ping_router_locked(rtr);
1857 LASSERT(version == the_lnet.ln_routers_version);
1862 running = 0; /* lock only needed for the recursion check */
1866 /* NB lnet_peers_start_down depends on me,
1867 * so must be called before any peer creation */
1869 lnet_get_tunables (void)
1873 s = getenv("LNET_ROUTER_PING_TIMEOUT");
1874 if (s != NULL) router_ping_timeout = atoi(s);
1876 s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1877 if (s != NULL) live_router_check_interval = atoi(s);
1879 s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1880 if (s != NULL) dead_router_check_interval = atoi(s);
1882 /* This replaces old lnd_notify mechanism */
1883 check_routers_before_use = 1;
1884 if (dead_router_check_interval <= 0)
1885 dead_router_check_interval = 30;
1889 lnet_rtrpools_free(int keep_pools)
1894 lnet_rtrpools_alloc(int im_a_arouter)