1 /*
2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Copyright (c) 2011, 2012, Intel Corporation.
5 *
6 * This file is part of Portals
7 * http://sourceforge.net/projects/sandiaportals/
8 *
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.
12 *
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.
17 *
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.
21 *
22 */
23
24 #define DEBUG_SUBSYSTEM S_LNET
25 #include "../../include/linux/lnet/lib-lnet.h"
26
27 #if defined(LNET_ROUTER)
28
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_LARGE_MIN 256 /* min value for each CPT */
34 #define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
35
36 static char *forwarding = "";
37 module_param(forwarding, charp, 0444);
38 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
39
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");
52
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");
56
57 int
lnet_peer_buffer_credits(lnet_ni_t * ni)58 lnet_peer_buffer_credits(lnet_ni_t *ni)
59 {
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;
65
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;
69 }
70
71 /* forward ref's */
72 static int lnet_router_checker(void *);
73 #else
74
75 int
lnet_peer_buffer_credits(lnet_ni_t * ni)76 lnet_peer_buffer_credits(lnet_ni_t *ni)
77 {
78 return 0;
79 }
80
81 #endif
82
83 static int check_routers_before_use;
84 module_param(check_routers_before_use, int, 0444);
85 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
86
87 int avoid_asym_router_failure = 1;
88 module_param(avoid_asym_router_failure, int, 0644);
89 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
90
91 static int dead_router_check_interval = 60;
92 module_param(dead_router_check_interval, int, 0644);
93 MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
94
95 static int live_router_check_interval = 60;
96 module_param(live_router_check_interval, int, 0644);
97 MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
98
99 static int router_ping_timeout = 50;
100 module_param(router_ping_timeout, int, 0644);
101 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
102
103 int
lnet_peers_start_down(void)104 lnet_peers_start_down(void)
105 {
106 return check_routers_before_use;
107 }
108
109 void
lnet_notify_locked(lnet_peer_t * lp,int notifylnd,int alive,unsigned long when)110 lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive,
111 unsigned long when)
112 {
113 if (time_before(when, lp->lp_timestamp)) { /* out of date information */
114 CDEBUG(D_NET, "Out of date\n");
115 return;
116 }
117
118 lp->lp_timestamp = when; /* update timestamp */
119 lp->lp_ping_deadline = 0; /* disable ping timeout */
120
121 if (lp->lp_alive_count != 0 && /* got old news */
122 (!lp->lp_alive) == (!alive)) { /* new date for old news */
123 CDEBUG(D_NET, "Old news\n");
124 return;
125 }
126
127 /* Flag that notification is outstanding */
128
129 lp->lp_alive_count++;
130 lp->lp_alive = !(!alive); /* 1 bit! */
131 lp->lp_notify = 1;
132 lp->lp_notifylnd |= notifylnd;
133 if (lp->lp_alive)
134 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
135
136 CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
137 }
138
139 static void
lnet_ni_notify_locked(lnet_ni_t * ni,lnet_peer_t * lp)140 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
141 {
142 int alive;
143 int notifylnd;
144
145 /* Notify only in 1 thread at any time to ensure ordered notification.
146 * NB individual events can be missed; the only guarantee is that you
147 * always get the most recent news */
148
149 if (lp->lp_notifying || ni == NULL)
150 return;
151
152 lp->lp_notifying = 1;
153
154 while (lp->lp_notify) {
155 alive = lp->lp_alive;
156 notifylnd = lp->lp_notifylnd;
157
158 lp->lp_notifylnd = 0;
159 lp->lp_notify = 0;
160
161 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
162 lnet_net_unlock(lp->lp_cpt);
163
164 /* A new notification could happen now; I'll handle it
165 * when control returns to me */
166
167 (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
168
169 lnet_net_lock(lp->lp_cpt);
170 }
171 }
172
173 lp->lp_notifying = 0;
174 }
175
176
177 static void
lnet_rtr_addref_locked(lnet_peer_t * lp)178 lnet_rtr_addref_locked(lnet_peer_t *lp)
179 {
180 LASSERT(lp->lp_refcount > 0);
181 LASSERT(lp->lp_rtr_refcount >= 0);
182
183 /* lnet_net_lock must be exclusively locked */
184 lp->lp_rtr_refcount++;
185 if (lp->lp_rtr_refcount == 1) {
186 struct list_head *pos;
187
188 /* a simple insertion sort */
189 list_for_each_prev(pos, &the_lnet.ln_routers) {
190 lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
191 lp_rtr_list);
192
193 if (rtr->lp_nid < lp->lp_nid)
194 break;
195 }
196
197 list_add(&lp->lp_rtr_list, pos);
198 /* addref for the_lnet.ln_routers */
199 lnet_peer_addref_locked(lp);
200 the_lnet.ln_routers_version++;
201 }
202 }
203
204 static void
lnet_rtr_decref_locked(lnet_peer_t * lp)205 lnet_rtr_decref_locked(lnet_peer_t *lp)
206 {
207 LASSERT(lp->lp_refcount > 0);
208 LASSERT(lp->lp_rtr_refcount > 0);
209
210 /* lnet_net_lock must be exclusively locked */
211 lp->lp_rtr_refcount--;
212 if (lp->lp_rtr_refcount == 0) {
213 LASSERT(list_empty(&lp->lp_routes));
214
215 if (lp->lp_rcd != NULL) {
216 list_add(&lp->lp_rcd->rcd_list,
217 &the_lnet.ln_rcd_deathrow);
218 lp->lp_rcd = NULL;
219 }
220
221 list_del(&lp->lp_rtr_list);
222 /* decref for the_lnet.ln_routers */
223 lnet_peer_decref_locked(lp);
224 the_lnet.ln_routers_version++;
225 }
226 }
227
228 lnet_remotenet_t *
lnet_find_net_locked(__u32 net)229 lnet_find_net_locked(__u32 net)
230 {
231 lnet_remotenet_t *rnet;
232 struct list_head *tmp;
233 struct list_head *rn_list;
234
235 LASSERT(!the_lnet.ln_shutdown);
236
237 rn_list = lnet_net2rnethash(net);
238 list_for_each(tmp, rn_list) {
239 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
240
241 if (rnet->lrn_net == net)
242 return rnet;
243 }
244 return NULL;
245 }
246
lnet_shuffle_seed(void)247 static void lnet_shuffle_seed(void)
248 {
249 static int seeded;
250 int lnd_type, seed[2];
251 struct timeval tv;
252 lnet_ni_t *ni;
253 struct list_head *tmp;
254
255 if (seeded)
256 return;
257
258 cfs_get_random_bytes(seed, sizeof(seed));
259
260 /* Nodes with small feet have little entropy
261 * the NID for this node gives the most entropy in the low bits */
262 list_for_each(tmp, &the_lnet.ln_nis) {
263 ni = list_entry(tmp, lnet_ni_t, ni_list);
264 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
265
266 if (lnd_type != LOLND)
267 seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
268 }
269
270 do_gettimeofday(&tv);
271 cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
272 seeded = 1;
273 }
274
275 /* NB expects LNET_LOCK held */
276 static void
lnet_add_route_to_rnet(lnet_remotenet_t * rnet,lnet_route_t * route)277 lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
278 {
279 unsigned int len = 0;
280 unsigned int offset = 0;
281 struct list_head *e;
282
283 lnet_shuffle_seed();
284
285 list_for_each(e, &rnet->lrn_routes) {
286 len++;
287 }
288
289 /* len+1 positions to add a new entry, also prevents division by 0 */
290 offset = cfs_rand() % (len + 1);
291 list_for_each(e, &rnet->lrn_routes) {
292 if (offset == 0)
293 break;
294 offset--;
295 }
296 list_add(&route->lr_list, e);
297 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
298
299 the_lnet.ln_remote_nets_version++;
300 lnet_rtr_addref_locked(route->lr_gateway);
301 }
302
303 int
lnet_add_route(__u32 net,unsigned int hops,lnet_nid_t gateway,unsigned int priority)304 lnet_add_route(__u32 net, unsigned int hops, lnet_nid_t gateway,
305 unsigned int priority)
306 {
307 struct list_head *e;
308 lnet_remotenet_t *rnet;
309 lnet_remotenet_t *rnet2;
310 lnet_route_t *route;
311 lnet_ni_t *ni;
312 int add_route;
313 int rc;
314
315 CDEBUG(D_NET, "Add route: net %s hops %u priority %u gw %s\n",
316 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
317
318 if (gateway == LNET_NID_ANY ||
319 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
320 net == LNET_NIDNET(LNET_NID_ANY) ||
321 LNET_NETTYP(net) == LOLND ||
322 LNET_NIDNET(gateway) == net ||
323 hops < 1 || hops > 255)
324 return -EINVAL;
325
326 if (lnet_islocalnet(net)) /* it's a local network */
327 return 0; /* ignore the route entry */
328
329 /* Assume net, route, all new */
330 LIBCFS_ALLOC(route, sizeof(*route));
331 LIBCFS_ALLOC(rnet, sizeof(*rnet));
332 if (route == NULL || rnet == NULL) {
333 CERROR("Out of memory creating route %s %d %s\n",
334 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
335 if (route != NULL)
336 LIBCFS_FREE(route, sizeof(*route));
337 if (rnet != NULL)
338 LIBCFS_FREE(rnet, sizeof(*rnet));
339 return -ENOMEM;
340 }
341
342 INIT_LIST_HEAD(&rnet->lrn_routes);
343 rnet->lrn_net = net;
344 route->lr_hops = hops;
345 route->lr_net = net;
346 route->lr_priority = priority;
347
348 lnet_net_lock(LNET_LOCK_EX);
349
350 rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
351 if (rc != 0) {
352 lnet_net_unlock(LNET_LOCK_EX);
353
354 LIBCFS_FREE(route, sizeof(*route));
355 LIBCFS_FREE(rnet, sizeof(*rnet));
356
357 if (rc == -EHOSTUNREACH) /* gateway is not on a local net */
358 return 0; /* ignore the route entry */
359 CERROR("Error %d creating route %s %d %s\n", rc,
360 libcfs_net2str(net), hops,
361 libcfs_nid2str(gateway));
362
363 return rc;
364 }
365
366 LASSERT(!the_lnet.ln_shutdown);
367
368 rnet2 = lnet_find_net_locked(net);
369 if (rnet2 == NULL) {
370 /* new network */
371 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
372 rnet2 = rnet;
373 }
374
375 /* Search for a duplicate route (it's a NOOP if it is) */
376 add_route = 1;
377 list_for_each(e, &rnet2->lrn_routes) {
378 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
379
380 if (route2->lr_gateway == route->lr_gateway) {
381 add_route = 0;
382 break;
383 }
384
385 /* our lookups must be true */
386 LASSERT(route2->lr_gateway->lp_nid != gateway);
387 }
388
389 if (add_route) {
390 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
391 lnet_add_route_to_rnet(rnet2, route);
392
393 ni = route->lr_gateway->lp_ni;
394 lnet_net_unlock(LNET_LOCK_EX);
395
396 /* XXX Assume alive */
397 if (ni->ni_lnd->lnd_notify != NULL)
398 (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
399
400 lnet_net_lock(LNET_LOCK_EX);
401 }
402
403 /* -1 for notify or !add_route */
404 lnet_peer_decref_locked(route->lr_gateway);
405 lnet_net_unlock(LNET_LOCK_EX);
406
407 if (!add_route)
408 LIBCFS_FREE(route, sizeof(*route));
409
410 if (rnet != rnet2)
411 LIBCFS_FREE(rnet, sizeof(*rnet));
412
413 return 0;
414 }
415
416 int
lnet_check_routes(void)417 lnet_check_routes(void)
418 {
419 lnet_remotenet_t *rnet;
420 lnet_route_t *route;
421 lnet_route_t *route2;
422 struct list_head *e1;
423 struct list_head *e2;
424 int cpt;
425 struct list_head *rn_list;
426 int i;
427
428 cpt = lnet_net_lock_current();
429
430 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
431 rn_list = &the_lnet.ln_remote_nets_hash[i];
432 list_for_each(e1, rn_list) {
433 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
434
435 route2 = NULL;
436 list_for_each(e2, &rnet->lrn_routes) {
437 lnet_nid_t nid1;
438 lnet_nid_t nid2;
439 int net;
440
441 route = list_entry(e2, lnet_route_t,
442 lr_list);
443
444 if (route2 == NULL) {
445 route2 = route;
446 continue;
447 }
448
449 if (route->lr_gateway->lp_ni ==
450 route2->lr_gateway->lp_ni)
451 continue;
452
453 nid1 = route->lr_gateway->lp_nid;
454 nid2 = route2->lr_gateway->lp_nid;
455 net = rnet->lrn_net;
456
457 lnet_net_unlock(cpt);
458
459 CERROR("Routes to %s via %s and %s not supported\n",
460 libcfs_net2str(net),
461 libcfs_nid2str(nid1),
462 libcfs_nid2str(nid2));
463 return -EINVAL;
464 }
465 }
466 }
467
468 lnet_net_unlock(cpt);
469 return 0;
470 }
471
472 int
lnet_del_route(__u32 net,lnet_nid_t gw_nid)473 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
474 {
475 struct lnet_peer *gateway;
476 lnet_remotenet_t *rnet;
477 lnet_route_t *route;
478 struct list_head *e1;
479 struct list_head *e2;
480 int rc = -ENOENT;
481 struct list_head *rn_list;
482 int idx = 0;
483
484 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
485 libcfs_net2str(net), libcfs_nid2str(gw_nid));
486
487 /* NB Caller may specify either all routes via the given gateway
488 * or a specific route entry actual NIDs) */
489
490 lnet_net_lock(LNET_LOCK_EX);
491 if (net == LNET_NIDNET(LNET_NID_ANY))
492 rn_list = &the_lnet.ln_remote_nets_hash[0];
493 else
494 rn_list = lnet_net2rnethash(net);
495
496 again:
497 list_for_each(e1, rn_list) {
498 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
499
500 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
501 net == rnet->lrn_net))
502 continue;
503
504 list_for_each(e2, &rnet->lrn_routes) {
505 route = list_entry(e2, lnet_route_t, lr_list);
506
507 gateway = route->lr_gateway;
508 if (!(gw_nid == LNET_NID_ANY ||
509 gw_nid == gateway->lp_nid))
510 continue;
511
512 list_del(&route->lr_list);
513 list_del(&route->lr_gwlist);
514 the_lnet.ln_remote_nets_version++;
515
516 if (list_empty(&rnet->lrn_routes))
517 list_del(&rnet->lrn_list);
518 else
519 rnet = NULL;
520
521 lnet_rtr_decref_locked(gateway);
522 lnet_peer_decref_locked(gateway);
523
524 lnet_net_unlock(LNET_LOCK_EX);
525
526 LIBCFS_FREE(route, sizeof(*route));
527
528 if (rnet != NULL)
529 LIBCFS_FREE(rnet, sizeof(*rnet));
530
531 rc = 0;
532 lnet_net_lock(LNET_LOCK_EX);
533 goto again;
534 }
535 }
536
537 if (net == LNET_NIDNET(LNET_NID_ANY) &&
538 ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
539 rn_list = &the_lnet.ln_remote_nets_hash[idx];
540 goto again;
541 }
542 lnet_net_unlock(LNET_LOCK_EX);
543
544 return rc;
545 }
546
547 void
lnet_destroy_routes(void)548 lnet_destroy_routes(void)
549 {
550 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
551 }
552
553 int
lnet_get_route(int idx,__u32 * net,__u32 * hops,lnet_nid_t * gateway,__u32 * alive,__u32 * priority)554 lnet_get_route(int idx, __u32 *net, __u32 *hops,
555 lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
556 {
557 struct list_head *e1;
558 struct list_head *e2;
559 lnet_remotenet_t *rnet;
560 lnet_route_t *route;
561 int cpt;
562 int i;
563 struct list_head *rn_list;
564
565 cpt = lnet_net_lock_current();
566
567 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
568 rn_list = &the_lnet.ln_remote_nets_hash[i];
569 list_for_each(e1, rn_list) {
570 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
571
572 list_for_each(e2, &rnet->lrn_routes) {
573 route = list_entry(e2, lnet_route_t,
574 lr_list);
575
576 if (idx-- == 0) {
577 *net = rnet->lrn_net;
578 *hops = route->lr_hops;
579 *priority = route->lr_priority;
580 *gateway = route->lr_gateway->lp_nid;
581 *alive = route->lr_gateway->lp_alive;
582 lnet_net_unlock(cpt);
583 return 0;
584 }
585 }
586 }
587 }
588
589 lnet_net_unlock(cpt);
590 return -ENOENT;
591 }
592
593 void
lnet_swap_pinginfo(lnet_ping_info_t * info)594 lnet_swap_pinginfo(lnet_ping_info_t *info)
595 {
596 int i;
597 lnet_ni_status_t *stat;
598
599 __swab32s(&info->pi_magic);
600 __swab32s(&info->pi_features);
601 __swab32s(&info->pi_pid);
602 __swab32s(&info->pi_nnis);
603 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
604 stat = &info->pi_ni[i];
605 __swab64s(&stat->ns_nid);
606 __swab32s(&stat->ns_status);
607 }
608 }
609
610 /**
611 * parse router-checker pinginfo, record number of down NIs for remote
612 * networks on that router.
613 */
614 static void
lnet_parse_rc_info(lnet_rc_data_t * rcd)615 lnet_parse_rc_info(lnet_rc_data_t *rcd)
616 {
617 lnet_ping_info_t *info = rcd->rcd_pinginfo;
618 struct lnet_peer *gw = rcd->rcd_gateway;
619 lnet_route_t *rtr;
620
621 if (!gw->lp_alive)
622 return;
623
624 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
625 lnet_swap_pinginfo(info);
626
627 /* NB always racing with network! */
628 if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
629 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
630 libcfs_nid2str(gw->lp_nid), info->pi_magic);
631 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
632 return;
633 }
634
635 gw->lp_ping_feats = info->pi_features;
636 if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
637 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
638 libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
639 return; /* nothing I can understand */
640 }
641
642 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
643 return; /* can't carry NI status info */
644
645 list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
646 int ptl_status = LNET_NI_STATUS_INVALID;
647 int down = 0;
648 int up = 0;
649 int i;
650
651 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
652 lnet_ni_status_t *stat = &info->pi_ni[i];
653 lnet_nid_t nid = stat->ns_nid;
654
655 if (nid == LNET_NID_ANY) {
656 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
657 libcfs_nid2str(gw->lp_nid));
658 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
659 return;
660 }
661
662 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
663 continue;
664
665 if (stat->ns_status == LNET_NI_STATUS_DOWN) {
666 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
667 down++;
668 else if (ptl_status != LNET_NI_STATUS_UP)
669 ptl_status = LNET_NI_STATUS_DOWN;
670 continue;
671 }
672
673 if (stat->ns_status == LNET_NI_STATUS_UP) {
674 if (LNET_NIDNET(nid) == rtr->lr_net) {
675 up = 1;
676 break;
677 }
678 /* ptl NIs are considered down only when
679 * they're all down */
680 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
681 ptl_status = LNET_NI_STATUS_UP;
682 continue;
683 }
684
685 CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
686 libcfs_nid2str(gw->lp_nid), stat->ns_status);
687 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
688 return;
689 }
690
691 if (up) { /* ignore downed NIs if NI for dest network is up */
692 rtr->lr_downis = 0;
693 continue;
694 }
695 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
696 }
697 }
698
699 static void
lnet_router_checker_event(lnet_event_t * event)700 lnet_router_checker_event(lnet_event_t *event)
701 {
702 lnet_rc_data_t *rcd = event->md.user_ptr;
703 struct lnet_peer *lp;
704
705 LASSERT(rcd != NULL);
706
707 if (event->unlinked) {
708 LNetInvalidateHandle(&rcd->rcd_mdh);
709 return;
710 }
711
712 LASSERT(event->type == LNET_EVENT_SEND ||
713 event->type == LNET_EVENT_REPLY);
714
715 lp = rcd->rcd_gateway;
716 LASSERT(lp != NULL);
717
718 /* NB: it's called with holding lnet_res_lock, we have a few
719 * places need to hold both locks at the same time, please take
720 * care of lock ordering */
721 lnet_net_lock(lp->lp_cpt);
722 if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
723 /* ignore if no longer a router or rcd is replaced */
724 goto out;
725 }
726
727 if (event->type == LNET_EVENT_SEND) {
728 lp->lp_ping_notsent = 0;
729 if (event->status == 0)
730 goto out;
731 }
732
733 /* LNET_EVENT_REPLY */
734 /* A successful REPLY means the router is up. If _any_ comms
735 * to the router fail I assume it's down (this will happen if
736 * we ping alive routers to try to detect router death before
737 * apps get burned). */
738
739 lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
740 /* The router checker will wake up very shortly and do the
741 * actual notification.
742 * XXX If 'lp' stops being a router before then, it will still
743 * have the notification pending!!! */
744
745 if (avoid_asym_router_failure && event->status == 0)
746 lnet_parse_rc_info(rcd);
747
748 out:
749 lnet_net_unlock(lp->lp_cpt);
750 }
751
752 static void
lnet_wait_known_routerstate(void)753 lnet_wait_known_routerstate(void)
754 {
755 lnet_peer_t *rtr;
756 struct list_head *entry;
757 int all_known;
758
759 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
760
761 for (;;) {
762 int cpt = lnet_net_lock_current();
763
764 all_known = 1;
765 list_for_each(entry, &the_lnet.ln_routers) {
766 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
767
768 if (rtr->lp_alive_count == 0) {
769 all_known = 0;
770 break;
771 }
772 }
773
774 lnet_net_unlock(cpt);
775
776 if (all_known)
777 return;
778
779 set_current_state(TASK_UNINTERRUPTIBLE);
780 schedule_timeout(cfs_time_seconds(1));
781 }
782 }
783
784 void
lnet_router_ni_update_locked(lnet_peer_t * gw,__u32 net)785 lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
786 {
787 lnet_route_t *rte;
788
789 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
790 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
791 if (rte->lr_net == net) {
792 rte->lr_downis = 0;
793 break;
794 }
795 }
796 }
797 }
798
799 static void
lnet_update_ni_status_locked(void)800 lnet_update_ni_status_locked(void)
801 {
802 lnet_ni_t *ni;
803 long now;
804 int timeout;
805
806 LASSERT(the_lnet.ln_routing);
807
808 timeout = router_ping_timeout +
809 max(live_router_check_interval, dead_router_check_interval);
810
811 now = get_seconds();
812 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
813 if (ni->ni_lnd->lnd_type == LOLND)
814 continue;
815
816 if (now < ni->ni_last_alive + timeout)
817 continue;
818
819 lnet_ni_lock(ni);
820 /* re-check with lock */
821 if (now < ni->ni_last_alive + timeout) {
822 lnet_ni_unlock(ni);
823 continue;
824 }
825
826 LASSERT(ni->ni_status != NULL);
827
828 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
829 CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
830 libcfs_nid2str(ni->ni_nid), timeout);
831 /* NB: so far, this is the only place to set
832 * NI status to "down" */
833 ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
834 }
835 lnet_ni_unlock(ni);
836 }
837 }
838
839 static void
lnet_destroy_rc_data(lnet_rc_data_t * rcd)840 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
841 {
842 LASSERT(list_empty(&rcd->rcd_list));
843 /* detached from network */
844 LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
845
846 if (rcd->rcd_gateway != NULL) {
847 int cpt = rcd->rcd_gateway->lp_cpt;
848
849 lnet_net_lock(cpt);
850 lnet_peer_decref_locked(rcd->rcd_gateway);
851 lnet_net_unlock(cpt);
852 }
853
854 if (rcd->rcd_pinginfo != NULL)
855 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
856
857 LIBCFS_FREE(rcd, sizeof(*rcd));
858 }
859
860 static lnet_rc_data_t *
lnet_create_rc_data_locked(lnet_peer_t * gateway)861 lnet_create_rc_data_locked(lnet_peer_t *gateway)
862 {
863 lnet_rc_data_t *rcd = NULL;
864 lnet_ping_info_t *pi;
865 int rc;
866 int i;
867
868 lnet_net_unlock(gateway->lp_cpt);
869
870 LIBCFS_ALLOC(rcd, sizeof(*rcd));
871 if (rcd == NULL)
872 goto out;
873
874 LNetInvalidateHandle(&rcd->rcd_mdh);
875 INIT_LIST_HEAD(&rcd->rcd_list);
876
877 LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
878 if (pi == NULL)
879 goto out;
880
881 for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
882 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
883 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
884 }
885 rcd->rcd_pinginfo = pi;
886
887 LASSERT(!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
888 rc = LNetMDBind((lnet_md_t){.start = pi,
889 .user_ptr = rcd,
890 .length = LNET_PINGINFO_SIZE,
891 .threshold = LNET_MD_THRESH_INF,
892 .options = LNET_MD_TRUNCATE,
893 .eq_handle = the_lnet.ln_rc_eqh},
894 LNET_UNLINK,
895 &rcd->rcd_mdh);
896 if (rc < 0) {
897 CERROR("Can't bind MD: %d\n", rc);
898 goto out;
899 }
900 LASSERT(rc == 0);
901
902 lnet_net_lock(gateway->lp_cpt);
903 /* router table changed or someone has created rcd for this gateway */
904 if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
905 lnet_net_unlock(gateway->lp_cpt);
906 goto out;
907 }
908
909 lnet_peer_addref_locked(gateway);
910 rcd->rcd_gateway = gateway;
911 gateway->lp_rcd = rcd;
912 gateway->lp_ping_notsent = 0;
913
914 return rcd;
915
916 out:
917 if (rcd != NULL) {
918 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
919 rc = LNetMDUnlink(rcd->rcd_mdh);
920 LASSERT(rc == 0);
921 }
922 lnet_destroy_rc_data(rcd);
923 }
924
925 lnet_net_lock(gateway->lp_cpt);
926 return gateway->lp_rcd;
927 }
928
929 static int
lnet_router_check_interval(lnet_peer_t * rtr)930 lnet_router_check_interval(lnet_peer_t *rtr)
931 {
932 int secs;
933
934 secs = rtr->lp_alive ? live_router_check_interval :
935 dead_router_check_interval;
936 if (secs < 0)
937 secs = 0;
938
939 return secs;
940 }
941
942 static void
lnet_ping_router_locked(lnet_peer_t * rtr)943 lnet_ping_router_locked(lnet_peer_t *rtr)
944 {
945 lnet_rc_data_t *rcd = NULL;
946 unsigned long now = cfs_time_current();
947 int secs;
948
949 lnet_peer_addref_locked(rtr);
950
951 if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
952 cfs_time_after(now, rtr->lp_ping_deadline))
953 lnet_notify_locked(rtr, 1, 0, now);
954
955 /* Run any outstanding notifications */
956 lnet_ni_notify_locked(rtr->lp_ni, rtr);
957
958 if (!lnet_isrouter(rtr) ||
959 the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
960 /* router table changed or router checker is shutting down */
961 lnet_peer_decref_locked(rtr);
962 return;
963 }
964
965 rcd = rtr->lp_rcd != NULL ?
966 rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
967
968 if (rcd == NULL)
969 return;
970
971 secs = lnet_router_check_interval(rtr);
972
973 CDEBUG(D_NET,
974 "rtr %s %d: deadline %lu ping_notsent %d alive %d alive_count %d lp_ping_timestamp %lu\n",
975 libcfs_nid2str(rtr->lp_nid), secs,
976 rtr->lp_ping_deadline, rtr->lp_ping_notsent,
977 rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
978
979 if (secs != 0 && !rtr->lp_ping_notsent &&
980 cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
981 cfs_time_seconds(secs)))) {
982 int rc;
983 lnet_process_id_t id;
984 lnet_handle_md_t mdh;
985
986 id.nid = rtr->lp_nid;
987 id.pid = LUSTRE_SRV_LNET_PID;
988 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
989
990 rtr->lp_ping_notsent = 1;
991 rtr->lp_ping_timestamp = now;
992
993 mdh = rcd->rcd_mdh;
994
995 if (rtr->lp_ping_deadline == 0) {
996 rtr->lp_ping_deadline =
997 cfs_time_shift(router_ping_timeout);
998 }
999
1000 lnet_net_unlock(rtr->lp_cpt);
1001
1002 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
1003 LNET_PROTO_PING_MATCHBITS, 0);
1004
1005 lnet_net_lock(rtr->lp_cpt);
1006 if (rc != 0)
1007 rtr->lp_ping_notsent = 0; /* no event pending */
1008 }
1009
1010 lnet_peer_decref_locked(rtr);
1011 }
1012
1013 int
lnet_router_checker_start(void)1014 lnet_router_checker_start(void)
1015 {
1016 int rc;
1017 int eqsz;
1018
1019 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1020
1021 if (check_routers_before_use &&
1022 dead_router_check_interval <= 0) {
1023 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be set if 'check_routers_before_use' is set\n");
1024 return -EINVAL;
1025 }
1026
1027 if (!the_lnet.ln_routing &&
1028 live_router_check_interval <= 0 &&
1029 dead_router_check_interval <= 0)
1030 return 0;
1031
1032 sema_init(&the_lnet.ln_rc_signal, 0);
1033 /* EQ size doesn't matter; the callback is guaranteed to get every
1034 * event */
1035 eqsz = 0;
1036 rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1037 &the_lnet.ln_rc_eqh);
1038 if (rc != 0) {
1039 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1040 return -ENOMEM;
1041 }
1042
1043 the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1044 rc = PTR_ERR(kthread_run(lnet_router_checker,
1045 NULL, "router_checker"));
1046 if (IS_ERR_VALUE(rc)) {
1047 CERROR("Can't start router checker thread: %d\n", rc);
1048 /* block until event callback signals exit */
1049 down(&the_lnet.ln_rc_signal);
1050 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1051 LASSERT(rc == 0);
1052 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1053 return -ENOMEM;
1054 }
1055
1056 if (check_routers_before_use) {
1057 /* Note that a helpful side-effect of pinging all known routers
1058 * at startup is that it makes them drop stale connections they
1059 * may have to a previous instance of me. */
1060 lnet_wait_known_routerstate();
1061 }
1062
1063 return 0;
1064 }
1065
1066 void
lnet_router_checker_stop(void)1067 lnet_router_checker_stop(void)
1068 {
1069 int rc;
1070
1071 if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1072 return;
1073
1074 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1075 the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1076
1077 /* block until event callback signals exit */
1078 down(&the_lnet.ln_rc_signal);
1079 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1080
1081 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1082 LASSERT(rc == 0);
1083 }
1084
1085 static void
lnet_prune_rc_data(int wait_unlink)1086 lnet_prune_rc_data(int wait_unlink)
1087 {
1088 lnet_rc_data_t *rcd;
1089 lnet_rc_data_t *tmp;
1090 lnet_peer_t *lp;
1091 struct list_head head;
1092 int i = 2;
1093
1094 if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1095 list_empty(&the_lnet.ln_rcd_deathrow) &&
1096 list_empty(&the_lnet.ln_rcd_zombie)))
1097 return;
1098
1099 INIT_LIST_HEAD(&head);
1100
1101 lnet_net_lock(LNET_LOCK_EX);
1102
1103 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1104 /* router checker is stopping, prune all */
1105 list_for_each_entry(lp, &the_lnet.ln_routers,
1106 lp_rtr_list) {
1107 if (lp->lp_rcd == NULL)
1108 continue;
1109
1110 LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1111 list_add(&lp->lp_rcd->rcd_list,
1112 &the_lnet.ln_rcd_deathrow);
1113 lp->lp_rcd = NULL;
1114 }
1115 }
1116
1117 /* unlink all RCDs on deathrow list */
1118 list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1119
1120 if (!list_empty(&head)) {
1121 lnet_net_unlock(LNET_LOCK_EX);
1122
1123 list_for_each_entry(rcd, &head, rcd_list)
1124 LNetMDUnlink(rcd->rcd_mdh);
1125
1126 lnet_net_lock(LNET_LOCK_EX);
1127 }
1128
1129 list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1130
1131 /* release all zombie RCDs */
1132 while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1133 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1134 rcd_list) {
1135 if (LNetHandleIsInvalid(rcd->rcd_mdh))
1136 list_move(&rcd->rcd_list, &head);
1137 }
1138
1139 wait_unlink = wait_unlink &&
1140 !list_empty(&the_lnet.ln_rcd_zombie);
1141
1142 lnet_net_unlock(LNET_LOCK_EX);
1143
1144 while (!list_empty(&head)) {
1145 rcd = list_entry(head.next,
1146 lnet_rc_data_t, rcd_list);
1147 list_del_init(&rcd->rcd_list);
1148 lnet_destroy_rc_data(rcd);
1149 }
1150
1151 if (!wait_unlink)
1152 return;
1153
1154 i++;
1155 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1156 "Waiting for rc buffers to unlink\n");
1157 set_current_state(TASK_UNINTERRUPTIBLE);
1158 schedule_timeout(cfs_time_seconds(1) / 4);
1159
1160 lnet_net_lock(LNET_LOCK_EX);
1161 }
1162
1163 lnet_net_unlock(LNET_LOCK_EX);
1164 }
1165
1166
1167 #if defined(LNET_ROUTER)
1168
1169 static int
lnet_router_checker(void * arg)1170 lnet_router_checker(void *arg)
1171 {
1172 lnet_peer_t *rtr;
1173 struct list_head *entry;
1174
1175 cfs_block_allsigs();
1176
1177 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1178
1179 while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1180 __u64 version;
1181 int cpt;
1182 int cpt2;
1183
1184 cpt = lnet_net_lock_current();
1185 rescan:
1186 version = the_lnet.ln_routers_version;
1187
1188 list_for_each(entry, &the_lnet.ln_routers) {
1189 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1190
1191 cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1192 if (cpt != cpt2) {
1193 lnet_net_unlock(cpt);
1194 cpt = cpt2;
1195 lnet_net_lock(cpt);
1196 /* the routers list has changed */
1197 if (version != the_lnet.ln_routers_version)
1198 goto rescan;
1199 }
1200
1201 lnet_ping_router_locked(rtr);
1202
1203 /* NB dropped lock */
1204 if (version != the_lnet.ln_routers_version) {
1205 /* the routers list has changed */
1206 goto rescan;
1207 }
1208 }
1209
1210 if (the_lnet.ln_routing)
1211 lnet_update_ni_status_locked();
1212
1213 lnet_net_unlock(cpt);
1214
1215 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1216
1217 /* Call schedule_timeout() here always adds 1 to load average
1218 * because kernel counts # active tasks as nr_running
1219 * + nr_uninterruptible. */
1220 set_current_state(TASK_INTERRUPTIBLE);
1221 schedule_timeout(cfs_time_seconds(1));
1222 }
1223
1224 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1225
1226 lnet_prune_rc_data(1); /* wait for UNLINK */
1227
1228 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1229 up(&the_lnet.ln_rc_signal);
1230 /* The unlink event callback will signal final completion */
1231 return 0;
1232 }
1233
1234 static void
lnet_destroy_rtrbuf(lnet_rtrbuf_t * rb,int npages)1235 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1236 {
1237 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1238
1239 while (--npages >= 0)
1240 __free_page(rb->rb_kiov[npages].kiov_page);
1241
1242 LIBCFS_FREE(rb, sz);
1243 }
1244
1245 static lnet_rtrbuf_t *
lnet_new_rtrbuf(lnet_rtrbufpool_t * rbp,int cpt)1246 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1247 {
1248 int npages = rbp->rbp_npages;
1249 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1250 struct page *page;
1251 lnet_rtrbuf_t *rb;
1252 int i;
1253
1254 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1255 if (rb == NULL)
1256 return NULL;
1257
1258 rb->rb_pool = rbp;
1259
1260 for (i = 0; i < npages; i++) {
1261 page = alloc_pages_node(
1262 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1263 __GFP_ZERO | GFP_IOFS, 0);
1264 if (page == NULL) {
1265 while (--i >= 0)
1266 __free_page(rb->rb_kiov[i].kiov_page);
1267
1268 LIBCFS_FREE(rb, sz);
1269 return NULL;
1270 }
1271
1272 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1273 rb->rb_kiov[i].kiov_offset = 0;
1274 rb->rb_kiov[i].kiov_page = page;
1275 }
1276
1277 return rb;
1278 }
1279
1280 static void
lnet_rtrpool_free_bufs(lnet_rtrbufpool_t * rbp)1281 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
1282 {
1283 int npages = rbp->rbp_npages;
1284 int nbuffers = 0;
1285 lnet_rtrbuf_t *rb;
1286
1287 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1288 return;
1289
1290 LASSERT(list_empty(&rbp->rbp_msgs));
1291 LASSERT(rbp->rbp_credits == rbp->rbp_nbuffers);
1292
1293 while (!list_empty(&rbp->rbp_bufs)) {
1294 LASSERT(rbp->rbp_credits > 0);
1295
1296 rb = list_entry(rbp->rbp_bufs.next,
1297 lnet_rtrbuf_t, rb_list);
1298 list_del(&rb->rb_list);
1299 lnet_destroy_rtrbuf(rb, npages);
1300 nbuffers++;
1301 }
1302
1303 LASSERT(rbp->rbp_nbuffers == nbuffers);
1304 LASSERT(rbp->rbp_credits == nbuffers);
1305
1306 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1307 }
1308
1309 static int
lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t * rbp,int nbufs,int cpt)1310 lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1311 {
1312 lnet_rtrbuf_t *rb;
1313 int i;
1314
1315 if (rbp->rbp_nbuffers != 0) {
1316 LASSERT(rbp->rbp_nbuffers == nbufs);
1317 return 0;
1318 }
1319
1320 for (i = 0; i < nbufs; i++) {
1321 rb = lnet_new_rtrbuf(rbp, cpt);
1322
1323 if (rb == NULL) {
1324 CERROR("Failed to allocate %d router bufs of %d pages\n",
1325 nbufs, rbp->rbp_npages);
1326 return -ENOMEM;
1327 }
1328
1329 rbp->rbp_nbuffers++;
1330 rbp->rbp_credits++;
1331 rbp->rbp_mincredits++;
1332 list_add(&rb->rb_list, &rbp->rbp_bufs);
1333
1334 /* No allocation "under fire" */
1335 /* Otherwise we'd need code to schedule blocked msgs etc */
1336 LASSERT(!the_lnet.ln_routing);
1337 }
1338
1339 LASSERT(rbp->rbp_credits == nbufs);
1340 return 0;
1341 }
1342
1343 static void
lnet_rtrpool_init(lnet_rtrbufpool_t * rbp,int npages)1344 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1345 {
1346 INIT_LIST_HEAD(&rbp->rbp_msgs);
1347 INIT_LIST_HEAD(&rbp->rbp_bufs);
1348
1349 rbp->rbp_npages = npages;
1350 rbp->rbp_credits = 0;
1351 rbp->rbp_mincredits = 0;
1352 }
1353
1354 void
lnet_rtrpools_free(void)1355 lnet_rtrpools_free(void)
1356 {
1357 lnet_rtrbufpool_t *rtrp;
1358 int i;
1359
1360 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1361 return;
1362
1363 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1364 lnet_rtrpool_free_bufs(&rtrp[0]);
1365 lnet_rtrpool_free_bufs(&rtrp[1]);
1366 lnet_rtrpool_free_bufs(&rtrp[2]);
1367 }
1368
1369 cfs_percpt_free(the_lnet.ln_rtrpools);
1370 the_lnet.ln_rtrpools = NULL;
1371 }
1372
1373 static int
lnet_nrb_tiny_calculate(int npages)1374 lnet_nrb_tiny_calculate(int npages)
1375 {
1376 int nrbs = LNET_NRB_TINY;
1377
1378 if (tiny_router_buffers < 0) {
1379 LCONSOLE_ERROR_MSG(0x10c,
1380 "tiny_router_buffers=%d invalid when routing enabled\n",
1381 tiny_router_buffers);
1382 return -1;
1383 }
1384
1385 if (tiny_router_buffers > 0)
1386 nrbs = tiny_router_buffers;
1387
1388 nrbs /= LNET_CPT_NUMBER;
1389 return max(nrbs, LNET_NRB_TINY_MIN);
1390 }
1391
1392 static int
lnet_nrb_small_calculate(int npages)1393 lnet_nrb_small_calculate(int npages)
1394 {
1395 int nrbs = LNET_NRB_SMALL;
1396
1397 if (small_router_buffers < 0) {
1398 LCONSOLE_ERROR_MSG(0x10c,
1399 "small_router_buffers=%d invalid when routing enabled\n",
1400 small_router_buffers);
1401 return -1;
1402 }
1403
1404 if (small_router_buffers > 0)
1405 nrbs = small_router_buffers;
1406
1407 nrbs /= LNET_CPT_NUMBER;
1408 return max(nrbs, LNET_NRB_SMALL_MIN);
1409 }
1410
1411 static int
lnet_nrb_large_calculate(int npages)1412 lnet_nrb_large_calculate(int npages)
1413 {
1414 int nrbs = LNET_NRB_LARGE;
1415
1416 if (large_router_buffers < 0) {
1417 LCONSOLE_ERROR_MSG(0x10c,
1418 "large_router_buffers=%d invalid when routing enabled\n",
1419 large_router_buffers);
1420 return -1;
1421 }
1422
1423 if (large_router_buffers > 0)
1424 nrbs = large_router_buffers;
1425
1426 nrbs /= LNET_CPT_NUMBER;
1427 return max(nrbs, LNET_NRB_LARGE_MIN);
1428 }
1429
1430 int
lnet_rtrpools_alloc(int im_a_router)1431 lnet_rtrpools_alloc(int im_a_router)
1432 {
1433 lnet_rtrbufpool_t *rtrp;
1434 int large_pages;
1435 int small_pages = 1;
1436 int nrb_tiny;
1437 int nrb_small;
1438 int nrb_large;
1439 int rc;
1440 int i;
1441
1442 large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1443
1444 if (!strcmp(forwarding, "")) {
1445 /* not set either way */
1446 if (!im_a_router)
1447 return 0;
1448 } else if (!strcmp(forwarding, "disabled")) {
1449 /* explicitly disabled */
1450 return 0;
1451 } else if (!strcmp(forwarding, "enabled")) {
1452 /* explicitly enabled */
1453 } else {
1454 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either 'enabled' or 'disabled'\n");
1455 return -EINVAL;
1456 }
1457
1458 nrb_tiny = lnet_nrb_tiny_calculate(0);
1459 if (nrb_tiny < 0)
1460 return -EINVAL;
1461
1462 nrb_small = lnet_nrb_small_calculate(small_pages);
1463 if (nrb_small < 0)
1464 return -EINVAL;
1465
1466 nrb_large = lnet_nrb_large_calculate(large_pages);
1467 if (nrb_large < 0)
1468 return -EINVAL;
1469
1470 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1471 LNET_NRBPOOLS *
1472 sizeof(lnet_rtrbufpool_t));
1473 if (the_lnet.ln_rtrpools == NULL) {
1474 LCONSOLE_ERROR_MSG(0x10c,
1475 "Failed to initialize router buffe pool\n");
1476 return -ENOMEM;
1477 }
1478
1479 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1480 lnet_rtrpool_init(&rtrp[0], 0);
1481 rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i);
1482 if (rc != 0)
1483 goto failed;
1484
1485 lnet_rtrpool_init(&rtrp[1], small_pages);
1486 rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i);
1487 if (rc != 0)
1488 goto failed;
1489
1490 lnet_rtrpool_init(&rtrp[2], large_pages);
1491 rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i);
1492 if (rc != 0)
1493 goto failed;
1494 }
1495
1496 lnet_net_lock(LNET_LOCK_EX);
1497 the_lnet.ln_routing = 1;
1498 lnet_net_unlock(LNET_LOCK_EX);
1499
1500 return 0;
1501
1502 failed:
1503 lnet_rtrpools_free();
1504 return rc;
1505 }
1506
1507 int
lnet_notify(lnet_ni_t * ni,lnet_nid_t nid,int alive,unsigned long when)1508 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1509 {
1510 struct lnet_peer *lp = NULL;
1511 unsigned long now = cfs_time_current();
1512 int cpt = lnet_cpt_of_nid(nid);
1513
1514 LASSERT(!in_interrupt ());
1515
1516 CDEBUG(D_NET, "%s notifying %s: %s\n",
1517 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1518 libcfs_nid2str(nid),
1519 alive ? "up" : "down");
1520
1521 if (ni != NULL &&
1522 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1523 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1524 libcfs_nid2str(nid), alive ? "birth" : "death",
1525 libcfs_nid2str(ni->ni_nid));
1526 return -EINVAL;
1527 }
1528
1529 /* can't do predictions... */
1530 if (cfs_time_after(when, now)) {
1531 CWARN("Ignoring prediction from %s of %s %s %ld seconds in the future\n",
1532 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1533 libcfs_nid2str(nid), alive ? "up" : "down",
1534 cfs_duration_sec(cfs_time_sub(when, now)));
1535 return -EINVAL;
1536 }
1537
1538 if (ni != NULL && !alive && /* LND telling me she's down */
1539 !auto_down) { /* auto-down disabled */
1540 CDEBUG(D_NET, "Auto-down disabled\n");
1541 return 0;
1542 }
1543
1544 lnet_net_lock(cpt);
1545
1546 if (the_lnet.ln_shutdown) {
1547 lnet_net_unlock(cpt);
1548 return -ESHUTDOWN;
1549 }
1550
1551 lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1552 if (lp == NULL) {
1553 /* nid not found */
1554 lnet_net_unlock(cpt);
1555 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1556 return 0;
1557 }
1558
1559 /* We can't fully trust LND on reporting exact peer last_alive
1560 * if he notifies us about dead peer. For example ksocklnd can
1561 * call us with when == _time_when_the_node_was_booted_ if
1562 * no connections were successfully established */
1563 if (ni != NULL && !alive && when < lp->lp_last_alive)
1564 when = lp->lp_last_alive;
1565
1566 lnet_notify_locked(lp, ni == NULL, alive, when);
1567
1568 lnet_ni_notify_locked(ni, lp);
1569
1570 lnet_peer_decref_locked(lp);
1571
1572 lnet_net_unlock(cpt);
1573 return 0;
1574 }
1575 EXPORT_SYMBOL(lnet_notify);
1576
1577 void
lnet_get_tunables(void)1578 lnet_get_tunables(void)
1579 {
1580 }
1581
1582 #else
1583
1584 int
lnet_notify(lnet_ni_t * ni,lnet_nid_t nid,int alive,unsigned long when)1585 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1586 {
1587 return -EOPNOTSUPP;
1588 }
1589
1590 void
lnet_router_checker(void)1591 lnet_router_checker(void)
1592 {
1593 static time_t last;
1594 static int running;
1595
1596 time_t now = get_seconds();
1597 int interval = now - last;
1598 int rc;
1599 __u64 version;
1600 lnet_peer_t *rtr;
1601
1602 /* It's no use to call me again within a sec - all intervals and
1603 * timeouts are measured in seconds */
1604 if (last != 0 && interval < 2)
1605 return;
1606
1607 if (last != 0 &&
1608 interval > max(live_router_check_interval,
1609 dead_router_check_interval))
1610 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1611 live_router_check_interval, dead_router_check_interval,
1612 interval);
1613
1614 LASSERT(LNET_CPT_NUMBER == 1);
1615
1616 lnet_net_lock(0);
1617 LASSERT(!running); /* recursion check */
1618 running = 1;
1619 lnet_net_unlock(0);
1620
1621 last = now;
1622
1623 if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1624 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1625
1626 /* consume all pending events */
1627 while (1) {
1628 int i;
1629 lnet_event_t ev;
1630
1631 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1632 * recursion breaker in LNetEQPoll would fail */
1633 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1634 if (rc == 0) /* no event pending */
1635 break;
1636
1637 /* NB a lost SENT prevents me from pinging a router again */
1638 if (rc == -EOVERFLOW) {
1639 CERROR("Dropped an event!!!\n");
1640 abort();
1641 }
1642
1643 LASSERT(rc == 1);
1644
1645 lnet_router_checker_event(&ev);
1646 }
1647
1648 if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1649 lnet_prune_rc_data(1); /* release rcd */
1650 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1651 running = 0;
1652 return;
1653 }
1654
1655 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1656
1657 lnet_net_lock(0);
1658
1659 version = the_lnet.ln_routers_version;
1660 list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
1661 lnet_ping_router_locked(rtr);
1662 LASSERT(version == the_lnet.ln_routers_version);
1663 }
1664
1665 lnet_net_unlock(0);
1666
1667 running = 0; /* lock only needed for the recursion check */
1668 }
1669
1670 /* NB lnet_peers_start_down depends on me,
1671 * so must be called before any peer creation */
1672 void
lnet_get_tunables(void)1673 lnet_get_tunables(void)
1674 {
1675 char *s;
1676
1677 s = getenv("LNET_ROUTER_PING_TIMEOUT");
1678 if (s != NULL)
1679 router_ping_timeout = atoi(s);
1680
1681 s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1682 if (s != NULL)
1683 live_router_check_interval = atoi(s);
1684
1685 s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1686 if (s != NULL)
1687 dead_router_check_interval = atoi(s);
1688
1689 /* This replaces old lnd_notify mechanism */
1690 check_routers_before_use = 1;
1691 if (dead_router_check_interval <= 0)
1692 dead_router_check_interval = 30;
1693 }
1694
1695 void
lnet_rtrpools_free(void)1696 lnet_rtrpools_free(void)
1697 {
1698 }
1699
1700 int
lnet_rtrpools_alloc(int im_a_arouter)1701 lnet_rtrpools_alloc(int im_a_arouter)
1702 {
1703 return 0;
1704 }
1705
1706 #endif
1707