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writeback: Fix performance regression in wb_over_bg_thresh()
[deliverable/linux.git] / drivers / staging / lustre / lnet / lnet / router.c
1 /*
2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Copyright (c) 2011, 2015, 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 */
19
20 #define DEBUG_SUBSYSTEM S_LNET
21 #include "../../include/linux/lnet/lib-lnet.h"
22
23 #define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
24 #define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4)
25 #define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */
26 #define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
27 #define LNET_NRB_SMALL_PAGES 1
28 #define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
29 #define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
30 #define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_CACHE_SIZE - 1) >> \
31 PAGE_CACHE_SHIFT)
32
33 static char *forwarding = "";
34 module_param(forwarding, charp, 0444);
35 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
36
37 static int tiny_router_buffers;
38 module_param(tiny_router_buffers, int, 0444);
39 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
40 static int small_router_buffers;
41 module_param(small_router_buffers, int, 0444);
42 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
43 static int large_router_buffers;
44 module_param(large_router_buffers, int, 0444);
45 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
46 static int peer_buffer_credits;
47 module_param(peer_buffer_credits, int, 0444);
48 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
49
50 static int auto_down = 1;
51 module_param(auto_down, int, 0444);
52 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
53
54 int
55 lnet_peer_buffer_credits(lnet_ni_t *ni)
56 {
57 /* NI option overrides LNet default */
58 if (ni->ni_peerrtrcredits > 0)
59 return ni->ni_peerrtrcredits;
60 if (peer_buffer_credits > 0)
61 return peer_buffer_credits;
62
63 /*
64 * As an approximation, allow this peer the same number of router
65 * buffers as it is allowed outstanding sends
66 */
67 return ni->ni_peertxcredits;
68 }
69
70 /* forward ref's */
71 static int lnet_router_checker(void *);
72
73 static int check_routers_before_use;
74 module_param(check_routers_before_use, int, 0444);
75 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
76
77 int avoid_asym_router_failure = 1;
78 module_param(avoid_asym_router_failure, int, 0644);
79 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
80
81 static int dead_router_check_interval = 60;
82 module_param(dead_router_check_interval, int, 0644);
83 MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
84
85 static int live_router_check_interval = 60;
86 module_param(live_router_check_interval, int, 0644);
87 MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
88
89 static int router_ping_timeout = 50;
90 module_param(router_ping_timeout, int, 0644);
91 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
92
93 int
94 lnet_peers_start_down(void)
95 {
96 return check_routers_before_use;
97 }
98
99 void
100 lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive,
101 unsigned long when)
102 {
103 if (time_before(when, lp->lp_timestamp)) { /* out of date information */
104 CDEBUG(D_NET, "Out of date\n");
105 return;
106 }
107
108 lp->lp_timestamp = when; /* update timestamp */
109 lp->lp_ping_deadline = 0; /* disable ping timeout */
110
111 if (lp->lp_alive_count && /* got old news */
112 (!lp->lp_alive) == (!alive)) { /* new date for old news */
113 CDEBUG(D_NET, "Old news\n");
114 return;
115 }
116
117 /* Flag that notification is outstanding */
118
119 lp->lp_alive_count++;
120 lp->lp_alive = !(!alive); /* 1 bit! */
121 lp->lp_notify = 1;
122 lp->lp_notifylnd |= notifylnd;
123 if (lp->lp_alive)
124 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
125
126 CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
127 }
128
129 static void
130 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
131 {
132 int alive;
133 int notifylnd;
134
135 /*
136 * Notify only in 1 thread at any time to ensure ordered notification.
137 * NB individual events can be missed; the only guarantee is that you
138 * always get the most recent news
139 */
140 if (lp->lp_notifying || !ni)
141 return;
142
143 lp->lp_notifying = 1;
144
145 while (lp->lp_notify) {
146 alive = lp->lp_alive;
147 notifylnd = lp->lp_notifylnd;
148
149 lp->lp_notifylnd = 0;
150 lp->lp_notify = 0;
151
152 if (notifylnd && ni->ni_lnd->lnd_notify) {
153 lnet_net_unlock(lp->lp_cpt);
154
155 /*
156 * A new notification could happen now; I'll handle it
157 * when control returns to me
158 */
159 ni->ni_lnd->lnd_notify(ni, lp->lp_nid, alive);
160
161 lnet_net_lock(lp->lp_cpt);
162 }
163 }
164
165 lp->lp_notifying = 0;
166 }
167
168 static void
169 lnet_rtr_addref_locked(lnet_peer_t *lp)
170 {
171 LASSERT(lp->lp_refcount > 0);
172 LASSERT(lp->lp_rtr_refcount >= 0);
173
174 /* lnet_net_lock must be exclusively locked */
175 lp->lp_rtr_refcount++;
176 if (lp->lp_rtr_refcount == 1) {
177 struct list_head *pos;
178
179 /* a simple insertion sort */
180 list_for_each_prev(pos, &the_lnet.ln_routers) {
181 lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
182 lp_rtr_list);
183
184 if (rtr->lp_nid < lp->lp_nid)
185 break;
186 }
187
188 list_add(&lp->lp_rtr_list, pos);
189 /* addref for the_lnet.ln_routers */
190 lnet_peer_addref_locked(lp);
191 the_lnet.ln_routers_version++;
192 }
193 }
194
195 static void
196 lnet_rtr_decref_locked(lnet_peer_t *lp)
197 {
198 LASSERT(lp->lp_refcount > 0);
199 LASSERT(lp->lp_rtr_refcount > 0);
200
201 /* lnet_net_lock must be exclusively locked */
202 lp->lp_rtr_refcount--;
203 if (!lp->lp_rtr_refcount) {
204 LASSERT(list_empty(&lp->lp_routes));
205
206 if (lp->lp_rcd) {
207 list_add(&lp->lp_rcd->rcd_list,
208 &the_lnet.ln_rcd_deathrow);
209 lp->lp_rcd = NULL;
210 }
211
212 list_del(&lp->lp_rtr_list);
213 /* decref for the_lnet.ln_routers */
214 lnet_peer_decref_locked(lp);
215 the_lnet.ln_routers_version++;
216 }
217 }
218
219 lnet_remotenet_t *
220 lnet_find_net_locked(__u32 net)
221 {
222 lnet_remotenet_t *rnet;
223 struct list_head *tmp;
224 struct list_head *rn_list;
225
226 LASSERT(!the_lnet.ln_shutdown);
227
228 rn_list = lnet_net2rnethash(net);
229 list_for_each(tmp, rn_list) {
230 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
231
232 if (rnet->lrn_net == net)
233 return rnet;
234 }
235 return NULL;
236 }
237
238 static void lnet_shuffle_seed(void)
239 {
240 static int seeded;
241 __u32 lnd_type, seed[2];
242 struct timespec64 ts;
243 lnet_ni_t *ni;
244 struct list_head *tmp;
245
246 if (seeded)
247 return;
248
249 cfs_get_random_bytes(seed, sizeof(seed));
250
251 /*
252 * Nodes with small feet have little entropy
253 * the NID for this node gives the most entropy in the low bits
254 */
255 list_for_each(tmp, &the_lnet.ln_nis) {
256 ni = list_entry(tmp, lnet_ni_t, ni_list);
257 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
258
259 if (lnd_type != LOLND)
260 seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
261 }
262
263 ktime_get_ts64(&ts);
264 cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
265 seeded = 1;
266 }
267
268 /* NB expects LNET_LOCK held */
269 static void
270 lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
271 {
272 unsigned int len = 0;
273 unsigned int offset = 0;
274 struct list_head *e;
275
276 lnet_shuffle_seed();
277
278 list_for_each(e, &rnet->lrn_routes) {
279 len++;
280 }
281
282 /* len+1 positions to add a new entry, also prevents division by 0 */
283 offset = cfs_rand() % (len + 1);
284 list_for_each(e, &rnet->lrn_routes) {
285 if (!offset)
286 break;
287 offset--;
288 }
289 list_add(&route->lr_list, e);
290 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
291
292 the_lnet.ln_remote_nets_version++;
293 lnet_rtr_addref_locked(route->lr_gateway);
294 }
295
296 int
297 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
298 unsigned int priority)
299 {
300 struct list_head *e;
301 lnet_remotenet_t *rnet;
302 lnet_remotenet_t *rnet2;
303 lnet_route_t *route;
304 lnet_ni_t *ni;
305 int add_route;
306 int rc;
307
308 CDEBUG(D_NET, "Add route: net %s hops %d priority %u gw %s\n",
309 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
310
311 if (gateway == LNET_NID_ANY ||
312 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
313 net == LNET_NIDNET(LNET_NID_ANY) ||
314 LNET_NETTYP(net) == LOLND ||
315 LNET_NIDNET(gateway) == net ||
316 (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
317 return -EINVAL;
318
319 if (lnet_islocalnet(net)) /* it's a local network */
320 return -EEXIST;
321
322 /* Assume net, route, all new */
323 LIBCFS_ALLOC(route, sizeof(*route));
324 LIBCFS_ALLOC(rnet, sizeof(*rnet));
325 if (!route || !rnet) {
326 CERROR("Out of memory creating route %s %d %s\n",
327 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
328 if (route)
329 LIBCFS_FREE(route, sizeof(*route));
330 if (rnet)
331 LIBCFS_FREE(rnet, sizeof(*rnet));
332 return -ENOMEM;
333 }
334
335 INIT_LIST_HEAD(&rnet->lrn_routes);
336 rnet->lrn_net = net;
337 route->lr_hops = hops;
338 route->lr_net = net;
339 route->lr_priority = priority;
340
341 lnet_net_lock(LNET_LOCK_EX);
342
343 rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
344 if (rc) {
345 lnet_net_unlock(LNET_LOCK_EX);
346
347 LIBCFS_FREE(route, sizeof(*route));
348 LIBCFS_FREE(rnet, sizeof(*rnet));
349
350 if (rc == -EHOSTUNREACH) /* gateway is not on a local net */
351 return rc; /* ignore the route entry */
352 CERROR("Error %d creating route %s %d %s\n", rc,
353 libcfs_net2str(net), hops,
354 libcfs_nid2str(gateway));
355 return rc;
356 }
357
358 LASSERT(!the_lnet.ln_shutdown);
359
360 rnet2 = lnet_find_net_locked(net);
361 if (!rnet2) {
362 /* new network */
363 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
364 rnet2 = rnet;
365 }
366
367 /* Search for a duplicate route (it's a NOOP if it is) */
368 add_route = 1;
369 list_for_each(e, &rnet2->lrn_routes) {
370 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
371
372 if (route2->lr_gateway == route->lr_gateway) {
373 add_route = 0;
374 break;
375 }
376
377 /* our lookups must be true */
378 LASSERT(route2->lr_gateway->lp_nid != gateway);
379 }
380
381 if (add_route) {
382 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
383 lnet_add_route_to_rnet(rnet2, route);
384
385 ni = route->lr_gateway->lp_ni;
386 lnet_net_unlock(LNET_LOCK_EX);
387
388 /* XXX Assume alive */
389 if (ni->ni_lnd->lnd_notify)
390 ni->ni_lnd->lnd_notify(ni, gateway, 1);
391
392 lnet_net_lock(LNET_LOCK_EX);
393 }
394
395 /* -1 for notify or !add_route */
396 lnet_peer_decref_locked(route->lr_gateway);
397 lnet_net_unlock(LNET_LOCK_EX);
398 rc = 0;
399
400 if (!add_route) {
401 rc = -EEXIST;
402 LIBCFS_FREE(route, sizeof(*route));
403 }
404
405 if (rnet != rnet2)
406 LIBCFS_FREE(rnet, sizeof(*rnet));
407
408 /* indicate to startup the router checker if configured */
409 wake_up(&the_lnet.ln_rc_waitq);
410
411 return rc;
412 }
413
414 int
415 lnet_check_routes(void)
416 {
417 lnet_remotenet_t *rnet;
418 lnet_route_t *route;
419 lnet_route_t *route2;
420 struct list_head *e1;
421 struct list_head *e2;
422 int cpt;
423 struct list_head *rn_list;
424 int i;
425
426 cpt = lnet_net_lock_current();
427
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);
432
433 route2 = NULL;
434 list_for_each(e2, &rnet->lrn_routes) {
435 lnet_nid_t nid1;
436 lnet_nid_t nid2;
437 int net;
438
439 route = list_entry(e2, lnet_route_t, lr_list);
440
441 if (!route2) {
442 route2 = route;
443 continue;
444 }
445
446 if (route->lr_gateway->lp_ni ==
447 route2->lr_gateway->lp_ni)
448 continue;
449
450 nid1 = route->lr_gateway->lp_nid;
451 nid2 = route2->lr_gateway->lp_nid;
452 net = rnet->lrn_net;
453
454 lnet_net_unlock(cpt);
455
456 CERROR("Routes to %s via %s and %s not supported\n",
457 libcfs_net2str(net),
458 libcfs_nid2str(nid1),
459 libcfs_nid2str(nid2));
460 return -EINVAL;
461 }
462 }
463 }
464
465 lnet_net_unlock(cpt);
466 return 0;
467 }
468
469 int
470 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
471 {
472 struct lnet_peer *gateway;
473 lnet_remotenet_t *rnet;
474 lnet_route_t *route;
475 struct list_head *e1;
476 struct list_head *e2;
477 int rc = -ENOENT;
478 struct list_head *rn_list;
479 int idx = 0;
480
481 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
482 libcfs_net2str(net), libcfs_nid2str(gw_nid));
483
484 /*
485 * NB Caller may specify either all routes via the given gateway
486 * or a specific route entry actual NIDs)
487 */
488 lnet_net_lock(LNET_LOCK_EX);
489 if (net == LNET_NIDNET(LNET_NID_ANY))
490 rn_list = &the_lnet.ln_remote_nets_hash[0];
491 else
492 rn_list = lnet_net2rnethash(net);
493
494 again:
495 list_for_each(e1, rn_list) {
496 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
497
498 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
499 net == rnet->lrn_net))
500 continue;
501
502 list_for_each(e2, &rnet->lrn_routes) {
503 route = list_entry(e2, lnet_route_t, lr_list);
504
505 gateway = route->lr_gateway;
506 if (!(gw_nid == LNET_NID_ANY ||
507 gw_nid == gateway->lp_nid))
508 continue;
509
510 list_del(&route->lr_list);
511 list_del(&route->lr_gwlist);
512 the_lnet.ln_remote_nets_version++;
513
514 if (list_empty(&rnet->lrn_routes))
515 list_del(&rnet->lrn_list);
516 else
517 rnet = NULL;
518
519 lnet_rtr_decref_locked(gateway);
520 lnet_peer_decref_locked(gateway);
521
522 lnet_net_unlock(LNET_LOCK_EX);
523
524 LIBCFS_FREE(route, sizeof(*route));
525
526 if (rnet)
527 LIBCFS_FREE(rnet, sizeof(*rnet));
528
529 rc = 0;
530 lnet_net_lock(LNET_LOCK_EX);
531 goto again;
532 }
533 }
534
535 if (net == LNET_NIDNET(LNET_NID_ANY) &&
536 ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
537 rn_list = &the_lnet.ln_remote_nets_hash[idx];
538 goto again;
539 }
540 lnet_net_unlock(LNET_LOCK_EX);
541
542 return rc;
543 }
544
545 void
546 lnet_destroy_routes(void)
547 {
548 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
549 }
550
551 int lnet_get_rtr_pool_cfg(int idx, struct lnet_ioctl_pool_cfg *pool_cfg)
552 {
553 int i, rc = -ENOENT, j;
554
555 if (!the_lnet.ln_rtrpools)
556 return rc;
557
558 for (i = 0; i < LNET_NRBPOOLS; i++) {
559 lnet_rtrbufpool_t *rbp;
560
561 lnet_net_lock(LNET_LOCK_EX);
562 cfs_percpt_for_each(rbp, j, the_lnet.ln_rtrpools) {
563 if (i++ != idx)
564 continue;
565
566 pool_cfg->pl_pools[i].pl_npages = rbp[i].rbp_npages;
567 pool_cfg->pl_pools[i].pl_nbuffers = rbp[i].rbp_nbuffers;
568 pool_cfg->pl_pools[i].pl_credits = rbp[i].rbp_credits;
569 pool_cfg->pl_pools[i].pl_mincredits = rbp[i].rbp_mincredits;
570 rc = 0;
571 break;
572 }
573 lnet_net_unlock(LNET_LOCK_EX);
574 }
575
576 lnet_net_lock(LNET_LOCK_EX);
577 pool_cfg->pl_routing = the_lnet.ln_routing;
578 lnet_net_unlock(LNET_LOCK_EX);
579
580 return rc;
581 }
582
583 int
584 lnet_get_route(int idx, __u32 *net, __u32 *hops,
585 lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
586 {
587 struct list_head *e1;
588 struct list_head *e2;
589 lnet_remotenet_t *rnet;
590 lnet_route_t *route;
591 int cpt;
592 int i;
593 struct list_head *rn_list;
594
595 cpt = lnet_net_lock_current();
596
597 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
598 rn_list = &the_lnet.ln_remote_nets_hash[i];
599 list_for_each(e1, rn_list) {
600 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
601
602 list_for_each(e2, &rnet->lrn_routes) {
603 route = list_entry(e2, lnet_route_t, lr_list);
604
605 if (!idx--) {
606 *net = rnet->lrn_net;
607 *hops = route->lr_hops;
608 *priority = route->lr_priority;
609 *gateway = route->lr_gateway->lp_nid;
610 *alive = lnet_is_route_alive(route);
611 lnet_net_unlock(cpt);
612 return 0;
613 }
614 }
615 }
616 }
617
618 lnet_net_unlock(cpt);
619 return -ENOENT;
620 }
621
622 void
623 lnet_swap_pinginfo(lnet_ping_info_t *info)
624 {
625 int i;
626 lnet_ni_status_t *stat;
627
628 __swab32s(&info->pi_magic);
629 __swab32s(&info->pi_features);
630 __swab32s(&info->pi_pid);
631 __swab32s(&info->pi_nnis);
632 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
633 stat = &info->pi_ni[i];
634 __swab64s(&stat->ns_nid);
635 __swab32s(&stat->ns_status);
636 }
637 }
638
639 /**
640 * parse router-checker pinginfo, record number of down NIs for remote
641 * networks on that router.
642 */
643 static void
644 lnet_parse_rc_info(lnet_rc_data_t *rcd)
645 {
646 lnet_ping_info_t *info = rcd->rcd_pinginfo;
647 struct lnet_peer *gw = rcd->rcd_gateway;
648 lnet_route_t *rte;
649
650 if (!gw->lp_alive)
651 return;
652
653 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
654 lnet_swap_pinginfo(info);
655
656 /* NB always racing with network! */
657 if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
658 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
659 libcfs_nid2str(gw->lp_nid), info->pi_magic);
660 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
661 return;
662 }
663
664 gw->lp_ping_feats = info->pi_features;
665 if (!(gw->lp_ping_feats & LNET_PING_FEAT_MASK)) {
666 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
667 libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
668 return; /* nothing I can understand */
669 }
670
671 if (!(gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS))
672 return; /* can't carry NI status info */
673
674 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
675 int down = 0;
676 int up = 0;
677 int i;
678
679 if (gw->lp_ping_feats & LNET_PING_FEAT_RTE_DISABLED) {
680 rte->lr_downis = 1;
681 continue;
682 }
683
684 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
685 lnet_ni_status_t *stat = &info->pi_ni[i];
686 lnet_nid_t nid = stat->ns_nid;
687
688 if (nid == LNET_NID_ANY) {
689 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
690 libcfs_nid2str(gw->lp_nid));
691 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
692 return;
693 }
694
695 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
696 continue;
697
698 if (stat->ns_status == LNET_NI_STATUS_DOWN) {
699 down++;
700 continue;
701 }
702
703 if (stat->ns_status == LNET_NI_STATUS_UP) {
704 if (LNET_NIDNET(nid) == rte->lr_net) {
705 up = 1;
706 break;
707 }
708 continue;
709 }
710
711 CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
712 libcfs_nid2str(gw->lp_nid), stat->ns_status);
713 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
714 return;
715 }
716
717 if (up) { /* ignore downed NIs if NI for dest network is up */
718 rte->lr_downis = 0;
719 continue;
720 }
721 /**
722 * if @down is zero and this route is single-hop, it means
723 * we can't find NI for target network
724 */
725 if (!down && rte->lr_hops == 1)
726 down = 1;
727
728 rte->lr_downis = down;
729 }
730 }
731
732 static void
733 lnet_router_checker_event(lnet_event_t *event)
734 {
735 lnet_rc_data_t *rcd = event->md.user_ptr;
736 struct lnet_peer *lp;
737
738 LASSERT(rcd);
739
740 if (event->unlinked) {
741 LNetInvalidateHandle(&rcd->rcd_mdh);
742 return;
743 }
744
745 LASSERT(event->type == LNET_EVENT_SEND ||
746 event->type == LNET_EVENT_REPLY);
747
748 lp = rcd->rcd_gateway;
749 LASSERT(lp);
750
751 /*
752 * NB: it's called with holding lnet_res_lock, we have a few
753 * places need to hold both locks at the same time, please take
754 * care of lock ordering
755 */
756 lnet_net_lock(lp->lp_cpt);
757 if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
758 /* ignore if no longer a router or rcd is replaced */
759 goto out;
760 }
761
762 if (event->type == LNET_EVENT_SEND) {
763 lp->lp_ping_notsent = 0;
764 if (!event->status)
765 goto out;
766 }
767
768 /* LNET_EVENT_REPLY */
769 /*
770 * A successful REPLY means the router is up. If _any_ comms
771 * to the router fail I assume it's down (this will happen if
772 * we ping alive routers to try to detect router death before
773 * apps get burned).
774 */
775 lnet_notify_locked(lp, 1, !event->status, cfs_time_current());
776
777 /*
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!!!
782 */
783 if (avoid_asym_router_failure && !event->status)
784 lnet_parse_rc_info(rcd);
785
786 out:
787 lnet_net_unlock(lp->lp_cpt);
788 }
789
790 static void
791 lnet_wait_known_routerstate(void)
792 {
793 lnet_peer_t *rtr;
794 struct list_head *entry;
795 int all_known;
796
797 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
798
799 for (;;) {
800 int cpt = lnet_net_lock_current();
801
802 all_known = 1;
803 list_for_each(entry, &the_lnet.ln_routers) {
804 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
805
806 if (!rtr->lp_alive_count) {
807 all_known = 0;
808 break;
809 }
810 }
811
812 lnet_net_unlock(cpt);
813
814 if (all_known)
815 return;
816
817 set_current_state(TASK_UNINTERRUPTIBLE);
818 schedule_timeout(cfs_time_seconds(1));
819 }
820 }
821
822 void
823 lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
824 {
825 lnet_route_t *rte;
826
827 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS)) {
828 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
829 if (rte->lr_net == net) {
830 rte->lr_downis = 0;
831 break;
832 }
833 }
834 }
835 }
836
837 static void
838 lnet_update_ni_status_locked(void)
839 {
840 lnet_ni_t *ni;
841 time64_t now;
842 int timeout;
843
844 LASSERT(the_lnet.ln_routing);
845
846 timeout = router_ping_timeout +
847 max(live_router_check_interval, dead_router_check_interval);
848
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)
852 continue;
853
854 if (now < ni->ni_last_alive + timeout)
855 continue;
856
857 lnet_ni_lock(ni);
858 /* re-check with lock */
859 if (now < ni->ni_last_alive + timeout) {
860 lnet_ni_unlock(ni);
861 continue;
862 }
863
864 LASSERT(ni->ni_status);
865
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 /*
870 * NB: so far, this is the only place to set
871 * NI status to "down"
872 */
873 ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
874 }
875 lnet_ni_unlock(ni);
876 }
877 }
878
879 static void
880 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
881 {
882 LASSERT(list_empty(&rcd->rcd_list));
883 /* detached from network */
884 LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
885
886 if (rcd->rcd_gateway) {
887 int cpt = rcd->rcd_gateway->lp_cpt;
888
889 lnet_net_lock(cpt);
890 lnet_peer_decref_locked(rcd->rcd_gateway);
891 lnet_net_unlock(cpt);
892 }
893
894 if (rcd->rcd_pinginfo)
895 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
896
897 LIBCFS_FREE(rcd, sizeof(*rcd));
898 }
899
900 static lnet_rc_data_t *
901 lnet_create_rc_data_locked(lnet_peer_t *gateway)
902 {
903 lnet_rc_data_t *rcd = NULL;
904 lnet_ping_info_t *pi;
905 int rc;
906 int i;
907
908 lnet_net_unlock(gateway->lp_cpt);
909
910 LIBCFS_ALLOC(rcd, sizeof(*rcd));
911 if (!rcd)
912 goto out;
913
914 LNetInvalidateHandle(&rcd->rcd_mdh);
915 INIT_LIST_HEAD(&rcd->rcd_list);
916
917 LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
918 if (!pi)
919 goto out;
920
921 for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
922 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
923 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
924 }
925 rcd->rcd_pinginfo = pi;
926
927 LASSERT(!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
928 rc = LNetMDBind((lnet_md_t){.start = pi,
929 .user_ptr = rcd,
930 .length = LNET_PINGINFO_SIZE,
931 .threshold = LNET_MD_THRESH_INF,
932 .options = LNET_MD_TRUNCATE,
933 .eq_handle = the_lnet.ln_rc_eqh},
934 LNET_UNLINK,
935 &rcd->rcd_mdh);
936 if (rc < 0) {
937 CERROR("Can't bind MD: %d\n", rc);
938 goto out;
939 }
940 LASSERT(!rc);
941
942 lnet_net_lock(gateway->lp_cpt);
943 /* router table changed or someone has created rcd for this gateway */
944 if (!lnet_isrouter(gateway) || gateway->lp_rcd) {
945 lnet_net_unlock(gateway->lp_cpt);
946 goto out;
947 }
948
949 lnet_peer_addref_locked(gateway);
950 rcd->rcd_gateway = gateway;
951 gateway->lp_rcd = rcd;
952 gateway->lp_ping_notsent = 0;
953
954 return rcd;
955
956 out:
957 if (rcd) {
958 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
959 rc = LNetMDUnlink(rcd->rcd_mdh);
960 LASSERT(!rc);
961 }
962 lnet_destroy_rc_data(rcd);
963 }
964
965 lnet_net_lock(gateway->lp_cpt);
966 return gateway->lp_rcd;
967 }
968
969 static int
970 lnet_router_check_interval(lnet_peer_t *rtr)
971 {
972 int secs;
973
974 secs = rtr->lp_alive ? live_router_check_interval :
975 dead_router_check_interval;
976 if (secs < 0)
977 secs = 0;
978
979 return secs;
980 }
981
982 static void
983 lnet_ping_router_locked(lnet_peer_t *rtr)
984 {
985 lnet_rc_data_t *rcd = NULL;
986 unsigned long now = cfs_time_current();
987 int secs;
988
989 lnet_peer_addref_locked(rtr);
990
991 if (rtr->lp_ping_deadline && /* ping timed out? */
992 cfs_time_after(now, rtr->lp_ping_deadline))
993 lnet_notify_locked(rtr, 1, 0, now);
994
995 /* Run any outstanding notifications */
996 lnet_ni_notify_locked(rtr->lp_ni, rtr);
997
998 if (!lnet_isrouter(rtr) ||
999 the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1000 /* router table changed or router checker is shutting down */
1001 lnet_peer_decref_locked(rtr);
1002 return;
1003 }
1004
1005 rcd = rtr->lp_rcd ?
1006 rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
1007
1008 if (!rcd)
1009 return;
1010
1011 secs = lnet_router_check_interval(rtr);
1012
1013 CDEBUG(D_NET,
1014 "rtr %s %d: deadline %lu ping_notsent %d alive %d alive_count %d lp_ping_timestamp %lu\n",
1015 libcfs_nid2str(rtr->lp_nid), secs,
1016 rtr->lp_ping_deadline, rtr->lp_ping_notsent,
1017 rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
1018
1019 if (secs && !rtr->lp_ping_notsent &&
1020 cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
1021 cfs_time_seconds(secs)))) {
1022 int rc;
1023 lnet_process_id_t id;
1024 lnet_handle_md_t mdh;
1025
1026 id.nid = rtr->lp_nid;
1027 id.pid = LNET_PID_LUSTRE;
1028 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
1029
1030 rtr->lp_ping_notsent = 1;
1031 rtr->lp_ping_timestamp = now;
1032
1033 mdh = rcd->rcd_mdh;
1034
1035 if (!rtr->lp_ping_deadline) {
1036 rtr->lp_ping_deadline =
1037 cfs_time_shift(router_ping_timeout);
1038 }
1039
1040 lnet_net_unlock(rtr->lp_cpt);
1041
1042 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
1043 LNET_PROTO_PING_MATCHBITS, 0);
1044
1045 lnet_net_lock(rtr->lp_cpt);
1046 if (rc)
1047 rtr->lp_ping_notsent = 0; /* no event pending */
1048 }
1049
1050 lnet_peer_decref_locked(rtr);
1051 }
1052
1053 int
1054 lnet_router_checker_start(void)
1055 {
1056 struct task_struct *task;
1057 int rc;
1058 int eqsz = 0;
1059
1060 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1061
1062 if (check_routers_before_use &&
1063 dead_router_check_interval <= 0) {
1064 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be set if 'check_routers_before_use' is set\n");
1065 return -EINVAL;
1066 }
1067
1068 sema_init(&the_lnet.ln_rc_signal, 0);
1069
1070 rc = LNetEQAlloc(0, lnet_router_checker_event, &the_lnet.ln_rc_eqh);
1071 if (rc) {
1072 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1073 return -ENOMEM;
1074 }
1075
1076 the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1077 task = kthread_run(lnet_router_checker, NULL, "router_checker");
1078 if (IS_ERR(task)) {
1079 rc = PTR_ERR(task);
1080 CERROR("Can't start router checker thread: %d\n", rc);
1081 /* block until event callback signals exit */
1082 down(&the_lnet.ln_rc_signal);
1083 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1084 LASSERT(!rc);
1085 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1086 return -ENOMEM;
1087 }
1088
1089 if (check_routers_before_use) {
1090 /*
1091 * Note that a helpful side-effect of pinging all known routers
1092 * at startup is that it makes them drop stale connections they
1093 * may have to a previous instance of me.
1094 */
1095 lnet_wait_known_routerstate();
1096 }
1097
1098 return 0;
1099 }
1100
1101 void
1102 lnet_router_checker_stop(void)
1103 {
1104 int rc;
1105
1106 if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1107 return;
1108
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);
1113
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);
1117
1118 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1119 LASSERT(!rc);
1120 }
1121
1122 static void
1123 lnet_prune_rc_data(int wait_unlink)
1124 {
1125 lnet_rc_data_t *rcd;
1126 lnet_rc_data_t *tmp;
1127 lnet_peer_t *lp;
1128 struct list_head head;
1129 int i = 2;
1130
1131 if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1132 list_empty(&the_lnet.ln_rcd_deathrow) &&
1133 list_empty(&the_lnet.ln_rcd_zombie)))
1134 return;
1135
1136 INIT_LIST_HEAD(&head);
1137
1138 lnet_net_lock(LNET_LOCK_EX);
1139
1140 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1141 /* router checker is stopping, prune all */
1142 list_for_each_entry(lp, &the_lnet.ln_routers,
1143 lp_rtr_list) {
1144 if (!lp->lp_rcd)
1145 continue;
1146
1147 LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1148 list_add(&lp->lp_rcd->rcd_list,
1149 &the_lnet.ln_rcd_deathrow);
1150 lp->lp_rcd = NULL;
1151 }
1152 }
1153
1154 /* unlink all RCDs on deathrow list */
1155 list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1156
1157 if (!list_empty(&head)) {
1158 lnet_net_unlock(LNET_LOCK_EX);
1159
1160 list_for_each_entry(rcd, &head, rcd_list)
1161 LNetMDUnlink(rcd->rcd_mdh);
1162
1163 lnet_net_lock(LNET_LOCK_EX);
1164 }
1165
1166 list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1167
1168 /* release all zombie RCDs */
1169 while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1170 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1171 rcd_list) {
1172 if (LNetHandleIsInvalid(rcd->rcd_mdh))
1173 list_move(&rcd->rcd_list, &head);
1174 }
1175
1176 wait_unlink = wait_unlink &&
1177 !list_empty(&the_lnet.ln_rcd_zombie);
1178
1179 lnet_net_unlock(LNET_LOCK_EX);
1180
1181 while (!list_empty(&head)) {
1182 rcd = list_entry(head.next,
1183 lnet_rc_data_t, rcd_list);
1184 list_del_init(&rcd->rcd_list);
1185 lnet_destroy_rc_data(rcd);
1186 }
1187
1188 if (!wait_unlink)
1189 return;
1190
1191 i++;
1192 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1193 "Waiting for rc buffers to unlink\n");
1194 set_current_state(TASK_UNINTERRUPTIBLE);
1195 schedule_timeout(cfs_time_seconds(1) / 4);
1196
1197 lnet_net_lock(LNET_LOCK_EX);
1198 }
1199
1200 lnet_net_unlock(LNET_LOCK_EX);
1201 }
1202
1203 /*
1204 * This function is called to check if the RC should block indefinitely.
1205 * It's called from lnet_router_checker() as well as being passed to
1206 * wait_event_interruptible() to avoid the lost wake_up problem.
1207 *
1208 * When it's called from wait_event_interruptible() it is necessary to
1209 * also not sleep if the rc state is not running to avoid a deadlock
1210 * when the system is shutting down
1211 */
1212 static inline bool
1213 lnet_router_checker_active(void)
1214 {
1215 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING)
1216 return true;
1217
1218 /*
1219 * Router Checker thread needs to run when routing is enabled in
1220 * order to call lnet_update_ni_status_locked()
1221 */
1222 if (the_lnet.ln_routing)
1223 return true;
1224
1225 return !list_empty(&the_lnet.ln_routers) &&
1226 (live_router_check_interval > 0 ||
1227 dead_router_check_interval > 0);
1228 }
1229
1230 static int
1231 lnet_router_checker(void *arg)
1232 {
1233 lnet_peer_t *rtr;
1234 struct list_head *entry;
1235
1236 cfs_block_allsigs();
1237
1238 while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1239 __u64 version;
1240 int cpt;
1241 int cpt2;
1242
1243 cpt = lnet_net_lock_current();
1244 rescan:
1245 version = the_lnet.ln_routers_version;
1246
1247 list_for_each(entry, &the_lnet.ln_routers) {
1248 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1249
1250 cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1251 if (cpt != cpt2) {
1252 lnet_net_unlock(cpt);
1253 cpt = cpt2;
1254 lnet_net_lock(cpt);
1255 /* the routers list has changed */
1256 if (version != the_lnet.ln_routers_version)
1257 goto rescan;
1258 }
1259
1260 lnet_ping_router_locked(rtr);
1261
1262 /* NB dropped lock */
1263 if (version != the_lnet.ln_routers_version) {
1264 /* the routers list has changed */
1265 goto rescan;
1266 }
1267 }
1268
1269 if (the_lnet.ln_routing)
1270 lnet_update_ni_status_locked();
1271
1272 lnet_net_unlock(cpt);
1273
1274 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1275
1276 /*
1277 * Call schedule_timeout() here always adds 1 to load average
1278 * because kernel counts # active tasks as nr_running
1279 * + nr_uninterruptible.
1280 */
1281 /*
1282 * if there are any routes then wakeup every second. If
1283 * there are no routes then sleep indefinitely until woken
1284 * up by a user adding a route
1285 */
1286 if (!lnet_router_checker_active())
1287 wait_event_interruptible(the_lnet.ln_rc_waitq,
1288 lnet_router_checker_active());
1289 else
1290 wait_event_interruptible_timeout(the_lnet.ln_rc_waitq,
1291 false,
1292 cfs_time_seconds(1));
1293 }
1294
1295 lnet_prune_rc_data(1); /* wait for UNLINK */
1296
1297 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1298 up(&the_lnet.ln_rc_signal);
1299 /* The unlink event callback will signal final completion */
1300 return 0;
1301 }
1302
1303 void
1304 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1305 {
1306 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1307
1308 while (--npages >= 0)
1309 __free_page(rb->rb_kiov[npages].kiov_page);
1310
1311 LIBCFS_FREE(rb, sz);
1312 }
1313
1314 static lnet_rtrbuf_t *
1315 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1316 {
1317 int npages = rbp->rbp_npages;
1318 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1319 struct page *page;
1320 lnet_rtrbuf_t *rb;
1321 int i;
1322
1323 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1324 if (!rb)
1325 return NULL;
1326
1327 rb->rb_pool = rbp;
1328
1329 for (i = 0; i < npages; i++) {
1330 page = alloc_pages_node(
1331 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1332 GFP_KERNEL | __GFP_ZERO, 0);
1333 if (!page) {
1334 while (--i >= 0)
1335 __free_page(rb->rb_kiov[i].kiov_page);
1336
1337 LIBCFS_FREE(rb, sz);
1338 return NULL;
1339 }
1340
1341 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1342 rb->rb_kiov[i].kiov_offset = 0;
1343 rb->rb_kiov[i].kiov_page = page;
1344 }
1345
1346 return rb;
1347 }
1348
1349 static void
1350 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp, int cpt)
1351 {
1352 int npages = rbp->rbp_npages;
1353 struct list_head tmp;
1354 lnet_rtrbuf_t *rb;
1355 lnet_rtrbuf_t *temp;
1356
1357 if (!rbp->rbp_nbuffers) /* not initialized or already freed */
1358 return;
1359
1360 INIT_LIST_HEAD(&tmp);
1361
1362 lnet_net_lock(cpt);
1363 lnet_drop_routed_msgs_locked(&rbp->rbp_msgs, cpt);
1364 list_splice_init(&rbp->rbp_bufs, &tmp);
1365 rbp->rbp_req_nbuffers = 0;
1366 rbp->rbp_nbuffers = 0;
1367 rbp->rbp_credits = 0;
1368 rbp->rbp_mincredits = 0;
1369 lnet_net_unlock(cpt);
1370
1371 /* Free buffers on the free list. */
1372 list_for_each_entry_safe(rb, temp, &tmp, rb_list) {
1373 list_del(&rb->rb_list);
1374 lnet_destroy_rtrbuf(rb, npages);
1375 }
1376 }
1377
1378 static int
1379 lnet_rtrpool_adjust_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1380 {
1381 struct list_head rb_list;
1382 lnet_rtrbuf_t *rb;
1383 int num_rb;
1384 int num_buffers = 0;
1385 int old_req_nbufs;
1386 int npages = rbp->rbp_npages;
1387
1388 lnet_net_lock(cpt);
1389 /*
1390 * If we are called for less buffers than already in the pool, we
1391 * just lower the req_nbuffers number and excess buffers will be
1392 * thrown away as they are returned to the free list. Credits
1393 * then get adjusted as well.
1394 * If we already have enough buffers allocated to serve the
1395 * increase requested, then we can treat that the same way as we
1396 * do the decrease.
1397 */
1398 num_rb = nbufs - rbp->rbp_nbuffers;
1399 if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1400 rbp->rbp_req_nbuffers = nbufs;
1401 lnet_net_unlock(cpt);
1402 return 0;
1403 }
1404 /*
1405 * store the older value of rbp_req_nbuffers and then set it to
1406 * the new request to prevent lnet_return_rx_credits_locked() from
1407 * freeing buffers that we need to keep around
1408 */
1409 old_req_nbufs = rbp->rbp_req_nbuffers;
1410 rbp->rbp_req_nbuffers = nbufs;
1411 lnet_net_unlock(cpt);
1412
1413 INIT_LIST_HEAD(&rb_list);
1414
1415 /*
1416 * allocate the buffers on a local list first. If all buffers are
1417 * allocated successfully then join this list to the rbp buffer
1418 * list. If not then free all allocated buffers.
1419 */
1420 while (num_rb-- > 0) {
1421 rb = lnet_new_rtrbuf(rbp, cpt);
1422 if (!rb) {
1423 CERROR("Failed to allocate %d route bufs of %d pages\n",
1424 nbufs, npages);
1425
1426 lnet_net_lock(cpt);
1427 rbp->rbp_req_nbuffers = old_req_nbufs;
1428 lnet_net_unlock(cpt);
1429
1430 goto failed;
1431 }
1432
1433 list_add(&rb->rb_list, &rb_list);
1434 num_buffers++;
1435 }
1436
1437 lnet_net_lock(cpt);
1438
1439 list_splice_tail(&rb_list, &rbp->rbp_bufs);
1440 rbp->rbp_nbuffers += num_buffers;
1441 rbp->rbp_credits += num_buffers;
1442 rbp->rbp_mincredits = rbp->rbp_credits;
1443 /*
1444 * We need to schedule blocked msg using the newly
1445 * added buffers.
1446 */
1447 while (!list_empty(&rbp->rbp_bufs) &&
1448 !list_empty(&rbp->rbp_msgs))
1449 lnet_schedule_blocked_locked(rbp);
1450
1451 lnet_net_unlock(cpt);
1452
1453 return 0;
1454
1455 failed:
1456 while (!list_empty(&rb_list)) {
1457 rb = list_entry(rb_list.next, lnet_rtrbuf_t, rb_list);
1458 list_del(&rb->rb_list);
1459 lnet_destroy_rtrbuf(rb, npages);
1460 }
1461
1462 return -ENOMEM;
1463 }
1464
1465 static void
1466 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1467 {
1468 INIT_LIST_HEAD(&rbp->rbp_msgs);
1469 INIT_LIST_HEAD(&rbp->rbp_bufs);
1470
1471 rbp->rbp_npages = npages;
1472 rbp->rbp_credits = 0;
1473 rbp->rbp_mincredits = 0;
1474 }
1475
1476 void
1477 lnet_rtrpools_free(int keep_pools)
1478 {
1479 lnet_rtrbufpool_t *rtrp;
1480 int i;
1481
1482 if (!the_lnet.ln_rtrpools) /* uninitialized or freed */
1483 return;
1484
1485 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1486 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1487 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1488 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1489 }
1490
1491 if (!keep_pools) {
1492 cfs_percpt_free(the_lnet.ln_rtrpools);
1493 the_lnet.ln_rtrpools = NULL;
1494 }
1495 }
1496
1497 static int
1498 lnet_nrb_tiny_calculate(void)
1499 {
1500 int nrbs = LNET_NRB_TINY;
1501
1502 if (tiny_router_buffers < 0) {
1503 LCONSOLE_ERROR_MSG(0x10c,
1504 "tiny_router_buffers=%d invalid when routing enabled\n",
1505 tiny_router_buffers);
1506 return -EINVAL;
1507 }
1508
1509 if (tiny_router_buffers > 0)
1510 nrbs = tiny_router_buffers;
1511
1512 nrbs /= LNET_CPT_NUMBER;
1513 return max(nrbs, LNET_NRB_TINY_MIN);
1514 }
1515
1516 static int
1517 lnet_nrb_small_calculate(void)
1518 {
1519 int nrbs = LNET_NRB_SMALL;
1520
1521 if (small_router_buffers < 0) {
1522 LCONSOLE_ERROR_MSG(0x10c,
1523 "small_router_buffers=%d invalid when routing enabled\n",
1524 small_router_buffers);
1525 return -EINVAL;
1526 }
1527
1528 if (small_router_buffers > 0)
1529 nrbs = small_router_buffers;
1530
1531 nrbs /= LNET_CPT_NUMBER;
1532 return max(nrbs, LNET_NRB_SMALL_MIN);
1533 }
1534
1535 static int
1536 lnet_nrb_large_calculate(void)
1537 {
1538 int nrbs = LNET_NRB_LARGE;
1539
1540 if (large_router_buffers < 0) {
1541 LCONSOLE_ERROR_MSG(0x10c,
1542 "large_router_buffers=%d invalid when routing enabled\n",
1543 large_router_buffers);
1544 return -EINVAL;
1545 }
1546
1547 if (large_router_buffers > 0)
1548 nrbs = large_router_buffers;
1549
1550 nrbs /= LNET_CPT_NUMBER;
1551 return max(nrbs, LNET_NRB_LARGE_MIN);
1552 }
1553
1554 int
1555 lnet_rtrpools_alloc(int im_a_router)
1556 {
1557 lnet_rtrbufpool_t *rtrp;
1558 int nrb_tiny;
1559 int nrb_small;
1560 int nrb_large;
1561 int rc;
1562 int i;
1563
1564 if (!strcmp(forwarding, "")) {
1565 /* not set either way */
1566 if (!im_a_router)
1567 return 0;
1568 } else if (!strcmp(forwarding, "disabled")) {
1569 /* explicitly disabled */
1570 return 0;
1571 } else if (!strcmp(forwarding, "enabled")) {
1572 /* explicitly enabled */
1573 } else {
1574 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either 'enabled' or 'disabled'\n");
1575 return -EINVAL;
1576 }
1577
1578 nrb_tiny = lnet_nrb_tiny_calculate();
1579 if (nrb_tiny < 0)
1580 return -EINVAL;
1581
1582 nrb_small = lnet_nrb_small_calculate();
1583 if (nrb_small < 0)
1584 return -EINVAL;
1585
1586 nrb_large = lnet_nrb_large_calculate();
1587 if (nrb_large < 0)
1588 return -EINVAL;
1589
1590 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1591 LNET_NRBPOOLS *
1592 sizeof(lnet_rtrbufpool_t));
1593 if (!the_lnet.ln_rtrpools) {
1594 LCONSOLE_ERROR_MSG(0x10c,
1595 "Failed to initialize router buffe pool\n");
1596 return -ENOMEM;
1597 }
1598
1599 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1600 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1601 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1602 nrb_tiny, i);
1603 if (rc)
1604 goto failed;
1605
1606 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1607 LNET_NRB_SMALL_PAGES);
1608 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1609 nrb_small, i);
1610 if (rc)
1611 goto failed;
1612
1613 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1614 LNET_NRB_LARGE_PAGES);
1615 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1616 nrb_large, i);
1617 if (rc)
1618 goto failed;
1619 }
1620
1621 lnet_net_lock(LNET_LOCK_EX);
1622 the_lnet.ln_routing = 1;
1623 lnet_net_unlock(LNET_LOCK_EX);
1624
1625 return 0;
1626
1627 failed:
1628 lnet_rtrpools_free(0);
1629 return rc;
1630 }
1631
1632 static int
1633 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1634 {
1635 int nrb = 0;
1636 int rc = 0;
1637 int i;
1638 lnet_rtrbufpool_t *rtrp;
1639
1640 /*
1641 * If the provided values for each buffer pool are different than the
1642 * configured values, we need to take action.
1643 */
1644 if (tiny >= 0) {
1645 tiny_router_buffers = tiny;
1646 nrb = lnet_nrb_tiny_calculate();
1647 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1648 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1649 nrb, i);
1650 if (rc)
1651 return rc;
1652 }
1653 }
1654 if (small >= 0) {
1655 small_router_buffers = small;
1656 nrb = lnet_nrb_small_calculate();
1657 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1658 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1659 nrb, i);
1660 if (rc)
1661 return rc;
1662 }
1663 }
1664 if (large >= 0) {
1665 large_router_buffers = large;
1666 nrb = lnet_nrb_large_calculate();
1667 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1668 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1669 nrb, i);
1670 if (rc)
1671 return rc;
1672 }
1673 }
1674
1675 return 0;
1676 }
1677
1678 int
1679 lnet_rtrpools_adjust(int tiny, int small, int large)
1680 {
1681 /*
1682 * this function doesn't revert the changes if adding new buffers
1683 * failed. It's up to the user space caller to revert the
1684 * changes.
1685 */
1686 if (!the_lnet.ln_routing)
1687 return 0;
1688
1689 return lnet_rtrpools_adjust_helper(tiny, small, large);
1690 }
1691
1692 int
1693 lnet_rtrpools_enable(void)
1694 {
1695 int rc;
1696
1697 if (the_lnet.ln_routing)
1698 return 0;
1699
1700 if (!the_lnet.ln_rtrpools)
1701 /*
1702 * If routing is turned off, and we have never
1703 * initialized the pools before, just call the
1704 * standard buffer pool allocation routine as
1705 * if we are just configuring this for the first
1706 * time.
1707 */
1708 return lnet_rtrpools_alloc(1);
1709
1710 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1711 if (rc)
1712 return rc;
1713
1714 lnet_net_lock(LNET_LOCK_EX);
1715 the_lnet.ln_routing = 1;
1716
1717 the_lnet.ln_ping_info->pi_features &= ~LNET_PING_FEAT_RTE_DISABLED;
1718 lnet_net_unlock(LNET_LOCK_EX);
1719
1720 return 0;
1721 }
1722
1723 void
1724 lnet_rtrpools_disable(void)
1725 {
1726 if (!the_lnet.ln_routing)
1727 return;
1728
1729 lnet_net_lock(LNET_LOCK_EX);
1730 the_lnet.ln_routing = 0;
1731 the_lnet.ln_ping_info->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1732
1733 tiny_router_buffers = 0;
1734 small_router_buffers = 0;
1735 large_router_buffers = 0;
1736 lnet_net_unlock(LNET_LOCK_EX);
1737 lnet_rtrpools_free(1);
1738 }
1739
1740 int
1741 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1742 {
1743 struct lnet_peer *lp = NULL;
1744 unsigned long now = cfs_time_current();
1745 int cpt = lnet_cpt_of_nid(nid);
1746
1747 LASSERT(!in_interrupt());
1748
1749 CDEBUG(D_NET, "%s notifying %s: %s\n",
1750 !ni ? "userspace" : libcfs_nid2str(ni->ni_nid),
1751 libcfs_nid2str(nid),
1752 alive ? "up" : "down");
1753
1754 if (ni &&
1755 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1756 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1757 libcfs_nid2str(nid), alive ? "birth" : "death",
1758 libcfs_nid2str(ni->ni_nid));
1759 return -EINVAL;
1760 }
1761
1762 /* can't do predictions... */
1763 if (cfs_time_after(when, now)) {
1764 CWARN("Ignoring prediction from %s of %s %s %ld seconds in the future\n",
1765 !ni ? "userspace" : libcfs_nid2str(ni->ni_nid),
1766 libcfs_nid2str(nid), alive ? "up" : "down",
1767 cfs_duration_sec(cfs_time_sub(when, now)));
1768 return -EINVAL;
1769 }
1770
1771 if (ni && !alive && /* LND telling me she's down */
1772 !auto_down) { /* auto-down disabled */
1773 CDEBUG(D_NET, "Auto-down disabled\n");
1774 return 0;
1775 }
1776
1777 lnet_net_lock(cpt);
1778
1779 if (the_lnet.ln_shutdown) {
1780 lnet_net_unlock(cpt);
1781 return -ESHUTDOWN;
1782 }
1783
1784 lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1785 if (!lp) {
1786 /* nid not found */
1787 lnet_net_unlock(cpt);
1788 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1789 return 0;
1790 }
1791
1792 /*
1793 * We can't fully trust LND on reporting exact peer last_alive
1794 * if he notifies us about dead peer. For example ksocklnd can
1795 * call us with when == _time_when_the_node_was_booted_ if
1796 * no connections were successfully established
1797 */
1798 if (ni && !alive && when < lp->lp_last_alive)
1799 when = lp->lp_last_alive;
1800
1801 lnet_notify_locked(lp, !ni, alive, when);
1802
1803 if (ni)
1804 lnet_ni_notify_locked(ni, lp);
1805
1806 lnet_peer_decref_locked(lp);
1807
1808 lnet_net_unlock(cpt);
1809 return 0;
1810 }
1811 EXPORT_SYMBOL(lnet_notify);
Linux kernel - Deliverables
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