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staging/lustre: Remove server defines from lustre_disk.h
[deliverable/linux.git] / drivers / staging / lustre / lnet / lnet / router.c
CommitLineData
d7e09d03
PT		 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
9fdaf8c0 25#include "../../include/linux/lnet/lib-lnet.h"
d7e09d03 26
d7e09d03
PT		 27#define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
28#define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4)
29#define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */
30#define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
31#define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
32#define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
33
34static char *forwarding = "";
8cc7b4b9
PT		 35module_param(forwarding, charp, 0444);
36MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
d7e09d03
PT		 37
38static int tiny_router_buffers;
8cc7b4b9
PT		 39module_param(tiny_router_buffers, int, 0444);
40MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
d7e09d03 41static int small_router_buffers;
8cc7b4b9
PT		 42module_param(small_router_buffers, int, 0444);
43MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
d7e09d03 44static int large_router_buffers;
8cc7b4b9
PT		 45module_param(large_router_buffers, int, 0444);
46MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
f96d1d7e 47static int peer_buffer_credits;
8cc7b4b9
PT		 48module_param(peer_buffer_credits, int, 0444);
49MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
d7e09d03
PT		 50
51static int auto_down = 1;
8cc7b4b9
PT		 52module_param(auto_down, int, 0444);
53MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
d7e09d03
PT		 54
55int
56lnet_peer_buffer_credits(lnet_ni_t *ni)
57{
58 /* NI option overrides LNet default */
59 if (ni->ni_peerrtrcredits > 0)
60 return ni->ni_peerrtrcredits;
61 if (peer_buffer_credits > 0)
62 return peer_buffer_credits;
63
64 /* As an approximation, allow this peer the same number of router
65 * buffers as it is allowed outstanding sends */
66 return ni->ni_peertxcredits;
67}
68
69/* forward ref's */
70static int lnet_router_checker(void *);
d7e09d03 71
f96d1d7e 72static int check_routers_before_use;
8cc7b4b9
PT		 73module_param(check_routers_before_use, int, 0444);
74MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
d7e09d03 75
af3fa7c7 76int avoid_asym_router_failure = 1;
8cc7b4b9
PT		 77module_param(avoid_asym_router_failure, int, 0644);
78MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
d7e09d03
PT		 79
80static int dead_router_check_interval = 60;
8cc7b4b9
PT		 81module_param(dead_router_check_interval, int, 0644);
82MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
d7e09d03
PT		 83
84static int live_router_check_interval = 60;
8cc7b4b9
PT		 85module_param(live_router_check_interval, int, 0644);
86MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
d7e09d03
PT		 87
88static int router_ping_timeout = 50;
8cc7b4b9
PT		 89module_param(router_ping_timeout, int, 0644);
90MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
d7e09d03
PT		 91
92int
93lnet_peers_start_down(void)
94{
95 return check_routers_before_use;
96}
97
98void
e6157b1b
RG		 99lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive,
100 unsigned long when)
d7e09d03 101{
699503bc 102 if (time_before(when, lp->lp_timestamp)) { /* out of date information */
d7e09d03
PT		 103 CDEBUG(D_NET, "Out of date\n");
104 return;
105 }
106
107 lp->lp_timestamp = when; /* update timestamp */
108 lp->lp_ping_deadline = 0; /* disable ping timeout */
109
110 if (lp->lp_alive_count != 0 && /* got old news */
111 (!lp->lp_alive) == (!alive)) { /* new date for old news */
112 CDEBUG(D_NET, "Old news\n");
113 return;
114 }
115
116 /* Flag that notification is outstanding */
117
118 lp->lp_alive_count++;
119 lp->lp_alive = !(!alive); /* 1 bit! */
120 lp->lp_notify = 1;
121 lp->lp_notifylnd |= notifylnd;
122 if (lp->lp_alive)
123 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
124
125 CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
126}
127
24008203 128static void
d7e09d03
PT		 129lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
130{
7e7ab095
MS		 131 int alive;
132 int notifylnd;
d7e09d03
PT		 133
134 /* Notify only in 1 thread at any time to ensure ordered notification.
135 * NB individual events can be missed; the only guarantee is that you
136 * always get the most recent news */
137
d36175e9 138 if (lp->lp_notifying || ni == NULL)
d7e09d03
PT		 139 return;
140
141 lp->lp_notifying = 1;
142
143 while (lp->lp_notify) {
7e7ab095 144 alive = lp->lp_alive;
d7e09d03
PT		 145 notifylnd = lp->lp_notifylnd;
146
147 lp->lp_notifylnd = 0;
148 lp->lp_notify = 0;
149
150 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
151 lnet_net_unlock(lp->lp_cpt);
152
153 /* A new notification could happen now; I'll handle it
154 * when control returns to me */
155
156 (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
157
158 lnet_net_lock(lp->lp_cpt);
159 }
160 }
161
162 lp->lp_notifying = 0;
163}
164
165
166static void
167lnet_rtr_addref_locked(lnet_peer_t *lp)
168{
169 LASSERT(lp->lp_refcount > 0);
170 LASSERT(lp->lp_rtr_refcount >= 0);
171
172 /* lnet_net_lock must be exclusively locked */
173 lp->lp_rtr_refcount++;
174 if (lp->lp_rtr_refcount == 1) {
175 struct list_head *pos;
176
177 /* a simple insertion sort */
178 list_for_each_prev(pos, &the_lnet.ln_routers) {
179 lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
180 lp_rtr_list);
181
182 if (rtr->lp_nid < lp->lp_nid)
183 break;
184 }
185
186 list_add(&lp->lp_rtr_list, pos);
187 /* addref for the_lnet.ln_routers */
188 lnet_peer_addref_locked(lp);
189 the_lnet.ln_routers_version++;
190 }
191}
192
193static void
194lnet_rtr_decref_locked(lnet_peer_t *lp)
195{
196 LASSERT(lp->lp_refcount > 0);
197 LASSERT(lp->lp_rtr_refcount > 0);
198
199 /* lnet_net_lock must be exclusively locked */
200 lp->lp_rtr_refcount--;
201 if (lp->lp_rtr_refcount == 0) {
202 LASSERT(list_empty(&lp->lp_routes));
203
204 if (lp->lp_rcd != NULL) {
205 list_add(&lp->lp_rcd->rcd_list,
206 &the_lnet.ln_rcd_deathrow);
207 lp->lp_rcd = NULL;
208 }
209
210 list_del(&lp->lp_rtr_list);
211 /* decref for the_lnet.ln_routers */
212 lnet_peer_decref_locked(lp);
213 the_lnet.ln_routers_version++;
214 }
215}
216
217lnet_remotenet_t *
939af333 218lnet_find_net_locked(__u32 net)
d7e09d03 219{
7e7ab095
MS		 220 lnet_remotenet_t *rnet;
221 struct list_head *tmp;
222 struct list_head *rn_list;
d7e09d03
PT		 223
224 LASSERT(!the_lnet.ln_shutdown);
225
226 rn_list = lnet_net2rnethash(net);
227 list_for_each(tmp, rn_list) {
228 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
229
230 if (rnet->lrn_net == net)
231 return rnet;
232 }
233 return NULL;
234}
235
236static void lnet_shuffle_seed(void)
237{
f96d1d7e 238 static int seeded;
d7e09d03
PT		 239 int lnd_type, seed[2];
240 struct timeval tv;
241 lnet_ni_t *ni;
242 struct list_head *tmp;
243
244 if (seeded)
245 return;
246
247 cfs_get_random_bytes(seed, sizeof(seed));
248
249 /* Nodes with small feet have little entropy
250 * the NID for this node gives the most entropy in the low bits */
251 list_for_each(tmp, &the_lnet.ln_nis) {
252 ni = list_entry(tmp, lnet_ni_t, ni_list);
253 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
254
255 if (lnd_type != LOLND)
256 seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
257 }
258
259 do_gettimeofday(&tv);
260 cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
261 seeded = 1;
d7e09d03
PT		 262}
263
264/* NB expects LNET_LOCK held */
24008203 265static void
939af333 266lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
d7e09d03 267{
7e7ab095
MS		 268 unsigned int len = 0;
269 unsigned int offset = 0;
270 struct list_head *e;
d7e09d03
PT		 271
272 lnet_shuffle_seed();
273
939af333 274 list_for_each(e, &rnet->lrn_routes) {
d7e09d03
PT		 275 len++;
276 }
277
278 /* len+1 positions to add a new entry, also prevents division by 0 */
279 offset = cfs_rand() % (len + 1);
939af333 280 list_for_each(e, &rnet->lrn_routes) {
d7e09d03
PT		 281 if (offset == 0)
282 break;
283 offset--;
284 }
285 list_add(&route->lr_list, e);
286 list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
287
288 the_lnet.ln_remote_nets_version++;
289 lnet_rtr_addref_locked(route->lr_gateway);
290}
291
292int
e75fb87f
DO		 293lnet_add_route(__u32 net, unsigned int hops, lnet_nid_t gateway,
294 unsigned int priority)
d7e09d03 295{
7e7ab095
MS		 296 struct list_head *e;
297 lnet_remotenet_t *rnet;
298 lnet_remotenet_t *rnet2;
299 lnet_route_t *route;
300 lnet_ni_t *ni;
301 int add_route;
302 int rc;
d7e09d03 303
e75fb87f
DO		 304 CDEBUG(D_NET, "Add route: net %s hops %u priority %u gw %s\n",
305 libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
d7e09d03
PT		 306
307 if (gateway == LNET_NID_ANY ||
308 LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
309 net == LNET_NIDNET(LNET_NID_ANY) ||
310 LNET_NETTYP(net) == LOLND ||
311 LNET_NIDNET(gateway) == net ||
312 hops < 1 || hops > 255)
fbe7c6c7 313 return -EINVAL;
d7e09d03
PT		 314
315 if (lnet_islocalnet(net)) /* it's a local network */
316 return 0; /* ignore the route entry */
317
318 /* Assume net, route, all new */
319 LIBCFS_ALLOC(route, sizeof(*route));
320 LIBCFS_ALLOC(rnet, sizeof(*rnet));
321 if (route == NULL || rnet == NULL) {
322 CERROR("Out of memory creating route %s %d %s\n",
323 libcfs_net2str(net), hops, libcfs_nid2str(gateway));
324 if (route != NULL)
325 LIBCFS_FREE(route, sizeof(*route));
326 if (rnet != NULL)
327 LIBCFS_FREE(rnet, sizeof(*rnet));
328 return -ENOMEM;
329 }
330
331 INIT_LIST_HEAD(&rnet->lrn_routes);
332 rnet->lrn_net = net;
333 route->lr_hops = hops;
334 route->lr_net = net;
e75fb87f 335 route->lr_priority = priority;
d7e09d03
PT		 336
337 lnet_net_lock(LNET_LOCK_EX);
338
339 rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
340 if (rc != 0) {
341 lnet_net_unlock(LNET_LOCK_EX);
342
343 LIBCFS_FREE(route, sizeof(*route));
344 LIBCFS_FREE(rnet, sizeof(*rnet));
345
ec523735 346 if (rc == -EHOSTUNREACH) /* gateway is not on a local net */
d7e09d03 347 return 0; /* ignore the route entry */
ec523735
RG		 348 CERROR("Error %d creating route %s %d %s\n", rc,
349 libcfs_net2str(net), hops,
350 libcfs_nid2str(gateway));
351
d7e09d03
PT		 352 return rc;
353 }
354
939af333 355 LASSERT(!the_lnet.ln_shutdown);
d7e09d03
PT		 356
357 rnet2 = lnet_find_net_locked(net);
358 if (rnet2 == NULL) {
359 /* new network */
360 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
361 rnet2 = rnet;
362 }
363
364 /* Search for a duplicate route (it's a NOOP if it is) */
365 add_route = 1;
939af333 366 list_for_each(e, &rnet2->lrn_routes) {
d7e09d03
PT		 367 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
368
369 if (route2->lr_gateway == route->lr_gateway) {
370 add_route = 0;
371 break;
372 }
373
374 /* our lookups must be true */
939af333 375 LASSERT(route2->lr_gateway->lp_nid != gateway);
d7e09d03
PT		 376 }
377
378 if (add_route) {
379 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
380 lnet_add_route_to_rnet(rnet2, route);
381
382 ni = route->lr_gateway->lp_ni;
383 lnet_net_unlock(LNET_LOCK_EX);
384
385 /* XXX Assume alive */
386 if (ni->ni_lnd->lnd_notify != NULL)
387 (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
388
389 lnet_net_lock(LNET_LOCK_EX);
390 }
391
392 /* -1 for notify or !add_route */
393 lnet_peer_decref_locked(route->lr_gateway);
394 lnet_net_unlock(LNET_LOCK_EX);
395
396 if (!add_route)
397 LIBCFS_FREE(route, sizeof(*route));
398
399 if (rnet != rnet2)
400 LIBCFS_FREE(rnet, sizeof(*rnet));
401
402 return 0;
403}
404
405int
406lnet_check_routes(void)
407{
7e7ab095
MS		 408 lnet_remotenet_t *rnet;
409 lnet_route_t *route;
410 lnet_route_t *route2;
411 struct list_head *e1;
412 struct list_head *e2;
413 int cpt;
414 struct list_head *rn_list;
415 int i;
d7e09d03
PT		 416
417 cpt = lnet_net_lock_current();
418
419 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
420 rn_list = &the_lnet.ln_remote_nets_hash[i];
421 list_for_each(e1, rn_list) {
422 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
423
424 route2 = NULL;
425 list_for_each(e2, &rnet->lrn_routes) {
7e7ab095
MS		 426 lnet_nid_t nid1;
427 lnet_nid_t nid2;
428 int net;
d7e09d03
PT		 429
430 route = list_entry(e2, lnet_route_t,
431 lr_list);
432
433 if (route2 == NULL) {
434 route2 = route;
435 continue;
436 }
437
438 if (route->lr_gateway->lp_ni ==
439 route2->lr_gateway->lp_ni)
440 continue;
441
442 nid1 = route->lr_gateway->lp_nid;
443 nid2 = route2->lr_gateway->lp_nid;
444 net = rnet->lrn_net;
445
446 lnet_net_unlock(cpt);
447
2d00bd17 448 CERROR("Routes to %s via %s and %s not supported\n",
d7e09d03
PT		 449 libcfs_net2str(net),
450 libcfs_nid2str(nid1),
451 libcfs_nid2str(nid2));
452 return -EINVAL;
453 }
454 }
455 }
456
457 lnet_net_unlock(cpt);
458 return 0;
459}
460
461int
462lnet_del_route(__u32 net, lnet_nid_t gw_nid)
463{
7e7ab095
MS		 464 struct lnet_peer *gateway;
465 lnet_remotenet_t *rnet;
466 lnet_route_t *route;
467 struct list_head *e1;
468 struct list_head *e2;
469 int rc = -ENOENT;
470 struct list_head *rn_list;
471 int idx = 0;
d7e09d03
PT		 472
473 CDEBUG(D_NET, "Del route: net %s : gw %s\n",
474 libcfs_net2str(net), libcfs_nid2str(gw_nid));
475
476 /* NB Caller may specify either all routes via the given gateway
477 * or a specific route entry actual NIDs) */
478
479 lnet_net_lock(LNET_LOCK_EX);
480 if (net == LNET_NIDNET(LNET_NID_ANY))
481 rn_list = &the_lnet.ln_remote_nets_hash[0];
482 else
483 rn_list = lnet_net2rnethash(net);
484
485 again:
486 list_for_each(e1, rn_list) {
487 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
488
489 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
490 net == rnet->lrn_net))
491 continue;
492
493 list_for_each(e2, &rnet->lrn_routes) {
494 route = list_entry(e2, lnet_route_t, lr_list);
495
496 gateway = route->lr_gateway;
497 if (!(gw_nid == LNET_NID_ANY ||
498 gw_nid == gateway->lp_nid))
499 continue;
500
501 list_del(&route->lr_list);
502 list_del(&route->lr_gwlist);
503 the_lnet.ln_remote_nets_version++;
504
505 if (list_empty(&rnet->lrn_routes))
506 list_del(&rnet->lrn_list);
507 else
508 rnet = NULL;
509
510 lnet_rtr_decref_locked(gateway);
511 lnet_peer_decref_locked(gateway);
512
513 lnet_net_unlock(LNET_LOCK_EX);
514
515 LIBCFS_FREE(route, sizeof(*route));
516
517 if (rnet != NULL)
518 LIBCFS_FREE(rnet, sizeof(*rnet));
519
520 rc = 0;
521 lnet_net_lock(LNET_LOCK_EX);
522 goto again;
523 }
524 }
525
526 if (net == LNET_NIDNET(LNET_NID_ANY) &&
527 ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
528 rn_list = &the_lnet.ln_remote_nets_hash[idx];
529 goto again;
530 }
531 lnet_net_unlock(LNET_LOCK_EX);
532
533 return rc;
534}
535
536void
939af333 537lnet_destroy_routes(void)
d7e09d03
PT		 538{
539 lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
540}
541
542int
543lnet_get_route(int idx, __u32 *net, __u32 *hops,
e75fb87f 544 lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
d7e09d03 545{
7e7ab095
MS		 546 struct list_head *e1;
547 struct list_head *e2;
548 lnet_remotenet_t *rnet;
549 lnet_route_t *route;
550 int cpt;
551 int i;
552 struct list_head *rn_list;
d7e09d03
PT		 553
554 cpt = lnet_net_lock_current();
555
556 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
557 rn_list = &the_lnet.ln_remote_nets_hash[i];
558 list_for_each(e1, rn_list) {
559 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
560
561 list_for_each(e2, &rnet->lrn_routes) {
562 route = list_entry(e2, lnet_route_t,
563 lr_list);
564
565 if (idx-- == 0) {
7e7ab095
MS		 566 *net = rnet->lrn_net;
567 *hops = route->lr_hops;
e75fb87f
DO		 568 *priority = route->lr_priority;
569 *gateway = route->lr_gateway->lp_nid;
7e7ab095 570 *alive = route->lr_gateway->lp_alive;
d7e09d03
PT		 571 lnet_net_unlock(cpt);
572 return 0;
573 }
574 }
575 }
576 }
577
578 lnet_net_unlock(cpt);
579 return -ENOENT;
580}
581
582void
583lnet_swap_pinginfo(lnet_ping_info_t *info)
584{
7e7ab095 585 int i;
d7e09d03
PT		 586 lnet_ni_status_t *stat;
587
588 __swab32s(&info->pi_magic);
589 __swab32s(&info->pi_features);
590 __swab32s(&info->pi_pid);
591 __swab32s(&info->pi_nnis);
592 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
593 stat = &info->pi_ni[i];
594 __swab64s(&stat->ns_nid);
595 __swab32s(&stat->ns_status);
596 }
d7e09d03
PT		 597}
598
599/**
600 * parse router-checker pinginfo, record number of down NIs for remote
601 * networks on that router.
602 */
603static void
604lnet_parse_rc_info(lnet_rc_data_t *rcd)
605{
7e7ab095
MS		 606 lnet_ping_info_t *info = rcd->rcd_pinginfo;
607 struct lnet_peer *gw = rcd->rcd_gateway;
608 lnet_route_t *rtr;
d7e09d03
PT		 609
610 if (!gw->lp_alive)
611 return;
612
613 if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
614 lnet_swap_pinginfo(info);
615
616 /* NB always racing with network! */
617 if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
618 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
619 libcfs_nid2str(gw->lp_nid), info->pi_magic);
620 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
621 return;
622 }
623
624 gw->lp_ping_feats = info->pi_features;
625 if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
626 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
627 libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
628 return; /* nothing I can understand */
629 }
630
631 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
632 return; /* can't carry NI status info */
633
634 list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
7e7ab095
MS		 635 int ptl_status = LNET_NI_STATUS_INVALID;
636 int down = 0;
637 int up = 0;
638 int i;
d7e09d03
PT		 639
640 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
641 lnet_ni_status_t *stat = &info->pi_ni[i];
7e7ab095 642 lnet_nid_t nid = stat->ns_nid;
d7e09d03
PT		 643
644 if (nid == LNET_NID_ANY) {
645 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
646 libcfs_nid2str(gw->lp_nid));
647 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
648 return;
649 }
650
651 if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
652 continue;
653
654 if (stat->ns_status == LNET_NI_STATUS_DOWN) {
655 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
656 down++;
657 else if (ptl_status != LNET_NI_STATUS_UP)
658 ptl_status = LNET_NI_STATUS_DOWN;
659 continue;
660 }
661
662 if (stat->ns_status == LNET_NI_STATUS_UP) {
663 if (LNET_NIDNET(nid) == rtr->lr_net) {
664 up = 1;
665 break;
666 }
667 /* ptl NIs are considered down only when
668 * they're all down */
669 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
670 ptl_status = LNET_NI_STATUS_UP;
671 continue;
672 }
673
674 CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
675 libcfs_nid2str(gw->lp_nid), stat->ns_status);
676 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
677 return;
678 }
679
680 if (up) { /* ignore downed NIs if NI for dest network is up */
681 rtr->lr_downis = 0;
682 continue;
683 }
684 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
685 }
686}
687
688static void
689lnet_router_checker_event(lnet_event_t *event)
690{
7e7ab095
MS		 691 lnet_rc_data_t *rcd = event->md.user_ptr;
692 struct lnet_peer *lp;
d7e09d03
PT		 693
694 LASSERT(rcd != NULL);
695
696 if (event->unlinked) {
697 LNetInvalidateHandle(&rcd->rcd_mdh);
698 return;
699 }
700
701 LASSERT(event->type == LNET_EVENT_SEND ||
702 event->type == LNET_EVENT_REPLY);
703
704 lp = rcd->rcd_gateway;
705 LASSERT(lp != NULL);
706
707 /* NB: it's called with holding lnet_res_lock, we have a few
708 * places need to hold both locks at the same time, please take
709 * care of lock ordering */
710 lnet_net_lock(lp->lp_cpt);
711 if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
712 /* ignore if no longer a router or rcd is replaced */
713 goto out;
714 }
715
716 if (event->type == LNET_EVENT_SEND) {
717 lp->lp_ping_notsent = 0;
718 if (event->status == 0)
719 goto out;
720 }
721
722 /* LNET_EVENT_REPLY */
723 /* A successful REPLY means the router is up. If _any_ comms
724 * to the router fail I assume it's down (this will happen if
725 * we ping alive routers to try to detect router death before
726 * apps get burned). */
727
728 lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
729 /* The router checker will wake up very shortly and do the
730 * actual notification.
731 * XXX If 'lp' stops being a router before then, it will still
732 * have the notification pending!!! */
733
734 if (avoid_asym_router_failure && event->status == 0)
735 lnet_parse_rc_info(rcd);
736
737 out:
738 lnet_net_unlock(lp->lp_cpt);
739}
740
2595fa36 741static void
d7e09d03
PT		 742lnet_wait_known_routerstate(void)
743{
7e7ab095
MS		 744 lnet_peer_t *rtr;
745 struct list_head *entry;
746 int all_known;
d7e09d03 747
939af333 748 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
d7e09d03
PT		 749
750 for (;;) {
7e7ab095 751 int cpt = lnet_net_lock_current();
d7e09d03
PT		 752
753 all_known = 1;
939af333 754 list_for_each(entry, &the_lnet.ln_routers) {
d7e09d03
PT		 755 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
756
757 if (rtr->lp_alive_count == 0) {
758 all_known = 0;
759 break;
760 }
761 }
762
763 lnet_net_unlock(cpt);
764
765 if (all_known)
766 return;
767
d3caf4d5
PT		 768 set_current_state(TASK_UNINTERRUPTIBLE);
769 schedule_timeout(cfs_time_seconds(1));
d7e09d03
PT		 770 }
771}
772
af3fa7c7
LZ		 773void
774lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
775{
776 lnet_route_t *rte;
777
778 if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
779 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
780 if (rte->lr_net == net) {
781 rte->lr_downis = 0;
782 break;
783 }
784 }
785 }
786}
787
2595fa36 788static void
d7e09d03
PT		 789lnet_update_ni_status_locked(void)
790{
7e7ab095
MS		 791 lnet_ni_t *ni;
792 long now;
793 int timeout;
d7e09d03
PT		 794
795 LASSERT(the_lnet.ln_routing);
796
797 timeout = router_ping_timeout +
0c575417 798 max(live_router_check_interval, dead_router_check_interval);
d7e09d03 799
7264b8a5 800 now = get_seconds();
d7e09d03
PT		 801 list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
802 if (ni->ni_lnd->lnd_type == LOLND)
803 continue;
804
805 if (now < ni->ni_last_alive + timeout)
806 continue;
807
808 lnet_ni_lock(ni);
809 /* re-check with lock */
810 if (now < ni->ni_last_alive + timeout) {
811 lnet_ni_unlock(ni);
812 continue;
813 }
814
815 LASSERT(ni->ni_status != NULL);
816
817 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
818 CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
819 libcfs_nid2str(ni->ni_nid), timeout);
820 /* NB: so far, this is the only place to set
821 * NI status to "down" */
822 ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
823 }
824 lnet_ni_unlock(ni);
825 }
826}
827
2595fa36 828static void
d7e09d03
PT		 829lnet_destroy_rc_data(lnet_rc_data_t *rcd)
830{
831 LASSERT(list_empty(&rcd->rcd_list));
832 /* detached from network */
833 LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
834
835 if (rcd->rcd_gateway != NULL) {
836 int cpt = rcd->rcd_gateway->lp_cpt;
837
838 lnet_net_lock(cpt);
839 lnet_peer_decref_locked(rcd->rcd_gateway);
840 lnet_net_unlock(cpt);
841 }
842
843 if (rcd->rcd_pinginfo != NULL)
844 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
845
846 LIBCFS_FREE(rcd, sizeof(*rcd));
847}
848
2595fa36 849static lnet_rc_data_t *
d7e09d03
PT		 850lnet_create_rc_data_locked(lnet_peer_t *gateway)
851{
7e7ab095
MS		 852 lnet_rc_data_t *rcd = NULL;
853 lnet_ping_info_t *pi;
854 int rc;
855 int i;
d7e09d03
PT		 856
857 lnet_net_unlock(gateway->lp_cpt);
858
859 LIBCFS_ALLOC(rcd, sizeof(*rcd));
860 if (rcd == NULL)
861 goto out;
862
863 LNetInvalidateHandle(&rcd->rcd_mdh);
864 INIT_LIST_HEAD(&rcd->rcd_list);
865
866 LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
867 if (pi == NULL)
868 goto out;
869
d7e09d03
PT		 870 for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
871 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
872 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
873 }
874 rcd->rcd_pinginfo = pi;
875
939af333 876 LASSERT(!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
d7e09d03
PT		 877 rc = LNetMDBind((lnet_md_t){.start = pi,
878 .user_ptr = rcd,
879 .length = LNET_PINGINFO_SIZE,
880 .threshold = LNET_MD_THRESH_INF,
881 .options = LNET_MD_TRUNCATE,
882 .eq_handle = the_lnet.ln_rc_eqh},
883 LNET_UNLINK,
884 &rcd->rcd_mdh);
885 if (rc < 0) {
886 CERROR("Can't bind MD: %d\n", rc);
887 goto out;
888 }
889 LASSERT(rc == 0);
890
891 lnet_net_lock(gateway->lp_cpt);
892 /* router table changed or someone has created rcd for this gateway */
893 if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
894 lnet_net_unlock(gateway->lp_cpt);
895 goto out;
896 }
897
898 lnet_peer_addref_locked(gateway);
899 rcd->rcd_gateway = gateway;
900 gateway->lp_rcd = rcd;
901 gateway->lp_ping_notsent = 0;
902
903 return rcd;
904
905 out:
906 if (rcd != NULL) {
907 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
908 rc = LNetMDUnlink(rcd->rcd_mdh);
909 LASSERT(rc == 0);
910 }
911 lnet_destroy_rc_data(rcd);
912 }
913
914 lnet_net_lock(gateway->lp_cpt);
915 return gateway->lp_rcd;
916}
917
918static int
939af333 919lnet_router_check_interval(lnet_peer_t *rtr)
d7e09d03
PT		 920{
921 int secs;
922
923 secs = rtr->lp_alive ? live_router_check_interval :
924 dead_router_check_interval;
925 if (secs < 0)
926 secs = 0;
927
928 return secs;
929}
930
931static void
939af333 932lnet_ping_router_locked(lnet_peer_t *rtr)
d7e09d03
PT		 933{
934 lnet_rc_data_t *rcd = NULL;
7e7ab095
MS		 935 unsigned long now = cfs_time_current();
936 int secs;
d7e09d03
PT		 937
938 lnet_peer_addref_locked(rtr);
939
940 if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
941 cfs_time_after(now, rtr->lp_ping_deadline))
942 lnet_notify_locked(rtr, 1, 0, now);
943
944 /* Run any outstanding notifications */
945 lnet_ni_notify_locked(rtr->lp_ni, rtr);
946
947 if (!lnet_isrouter(rtr) ||
948 the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
949 /* router table changed or router checker is shutting down */
950 lnet_peer_decref_locked(rtr);
951 return;
952 }
953
954 rcd = rtr->lp_rcd != NULL ?
955 rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
956
957 if (rcd == NULL)
958 return;
959
960 secs = lnet_router_check_interval(rtr);
961
962 CDEBUG(D_NET,
2d00bd17 963 "rtr %s %d: deadline %lu ping_notsent %d alive %d alive_count %d lp_ping_timestamp %lu\n",
d7e09d03
PT		 964 libcfs_nid2str(rtr->lp_nid), secs,
965 rtr->lp_ping_deadline, rtr->lp_ping_notsent,
966 rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
967
968 if (secs != 0 && !rtr->lp_ping_notsent &&
969 cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
970 cfs_time_seconds(secs)))) {
7e7ab095 971 int rc;
d7e09d03 972 lnet_process_id_t id;
7e7ab095 973 lnet_handle_md_t mdh;
d7e09d03
PT		 974
975 id.nid = rtr->lp_nid;
976 id.pid = LUSTRE_SRV_LNET_PID;
977 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
978
979 rtr->lp_ping_notsent = 1;
980 rtr->lp_ping_timestamp = now;
981
982 mdh = rcd->rcd_mdh;
983
984 if (rtr->lp_ping_deadline == 0) {
985 rtr->lp_ping_deadline =
986 cfs_time_shift(router_ping_timeout);
987 }
988
989 lnet_net_unlock(rtr->lp_cpt);
990
991 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
992 LNET_PROTO_PING_MATCHBITS, 0);
993
994 lnet_net_lock(rtr->lp_cpt);
995 if (rc != 0)
996 rtr->lp_ping_notsent = 0; /* no event pending */
997 }
998
999 lnet_peer_decref_locked(rtr);
d7e09d03
PT		 1000}
1001
1002int
1003lnet_router_checker_start(void)
1004{
7e7ab095
MS		 1005 int rc;
1006 int eqsz;
d7e09d03 1007
939af333 1008 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
d7e09d03
PT		 1009
1010 if (check_routers_before_use &&
1011 dead_router_check_interval <= 0) {
2d00bd17 1012 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be set if 'check_routers_before_use' is set\n");
d7e09d03
PT		 1013 return -EINVAL;
1014 }
1015
1016 if (!the_lnet.ln_routing &&
1017 live_router_check_interval <= 0 &&
1018 dead_router_check_interval <= 0)
1019 return 0;
1020
1021 sema_init(&the_lnet.ln_rc_signal, 0);
1022 /* EQ size doesn't matter; the callback is guaranteed to get every
1023 * event */
1024 eqsz = 0;
1025 rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1026 &the_lnet.ln_rc_eqh);
1027 if (rc != 0) {
1028 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1029 return -ENOMEM;
1030 }
1031
1032 the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1033 rc = PTR_ERR(kthread_run(lnet_router_checker,
1034 NULL, "router_checker"));
1035 if (IS_ERR_VALUE(rc)) {
1036 CERROR("Can't start router checker thread: %d\n", rc);
1037 /* block until event callback signals exit */
1038 down(&the_lnet.ln_rc_signal);
1039 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1040 LASSERT(rc == 0);
1041 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1042 return -ENOMEM;
1043 }
1044
1045 if (check_routers_before_use) {
1046 /* Note that a helpful side-effect of pinging all known routers
1047 * at startup is that it makes them drop stale connections they
1048 * may have to a previous instance of me. */
1049 lnet_wait_known_routerstate();
1050 }
1051
1052 return 0;
1053}
1054
1055void
939af333 1056lnet_router_checker_stop(void)
d7e09d03
PT		 1057{
1058 int rc;
1059
1060 if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1061 return;
1062
939af333 1063 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
d7e09d03
PT		 1064 the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1065
1066 /* block until event callback signals exit */
1067 down(&the_lnet.ln_rc_signal);
1068 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1069
1070 rc = LNetEQFree(the_lnet.ln_rc_eqh);
939af333 1071 LASSERT(rc == 0);
d7e09d03
PT		 1072}
1073
1074static void
1075lnet_prune_rc_data(int wait_unlink)
1076{
7e7ab095
MS		 1077 lnet_rc_data_t *rcd;
1078 lnet_rc_data_t *tmp;
1079 lnet_peer_t *lp;
1080 struct list_head head;
1081 int i = 2;
d7e09d03
PT		 1082
1083 if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1084 list_empty(&the_lnet.ln_rcd_deathrow) &&
1085 list_empty(&the_lnet.ln_rcd_zombie)))
1086 return;
1087
1088 INIT_LIST_HEAD(&head);
1089
1090 lnet_net_lock(LNET_LOCK_EX);
1091
1092 if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1093 /* router checker is stopping, prune all */
1094 list_for_each_entry(lp, &the_lnet.ln_routers,
1095 lp_rtr_list) {
1096 if (lp->lp_rcd == NULL)
1097 continue;
1098
1099 LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1100 list_add(&lp->lp_rcd->rcd_list,
1101 &the_lnet.ln_rcd_deathrow);
1102 lp->lp_rcd = NULL;
1103 }
1104 }
1105
1106 /* unlink all RCDs on deathrow list */
1107 list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1108
1109 if (!list_empty(&head)) {
1110 lnet_net_unlock(LNET_LOCK_EX);
1111
1112 list_for_each_entry(rcd, &head, rcd_list)
1113 LNetMDUnlink(rcd->rcd_mdh);
1114
1115 lnet_net_lock(LNET_LOCK_EX);
1116 }
1117
1118 list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1119
1120 /* release all zombie RCDs */
1121 while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1122 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1123 rcd_list) {
1124 if (LNetHandleIsInvalid(rcd->rcd_mdh))
1125 list_move(&rcd->rcd_list, &head);
1126 }
1127
1128 wait_unlink = wait_unlink &&
1129 !list_empty(&the_lnet.ln_rcd_zombie);
1130
1131 lnet_net_unlock(LNET_LOCK_EX);
1132
1133 while (!list_empty(&head)) {
1134 rcd = list_entry(head.next,
1135 lnet_rc_data_t, rcd_list);
1136 list_del_init(&rcd->rcd_list);
1137 lnet_destroy_rc_data(rcd);
1138 }
1139
1140 if (!wait_unlink)
1141 return;
1142
1143 i++;
1144 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1145 "Waiting for rc buffers to unlink\n");
d3caf4d5
PT		 1146 set_current_state(TASK_UNINTERRUPTIBLE);
1147 schedule_timeout(cfs_time_seconds(1) / 4);
d7e09d03
PT		 1148
1149 lnet_net_lock(LNET_LOCK_EX);
1150 }
1151
1152 lnet_net_unlock(LNET_LOCK_EX);
1153}
1154
d7e09d03
PT		 1155static int
1156lnet_router_checker(void *arg)
1157{
7e7ab095
MS		 1158 lnet_peer_t *rtr;
1159 struct list_head *entry;
d7e09d03
PT		 1160
1161 cfs_block_allsigs();
1162
939af333 1163 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
d7e09d03
PT		 1164
1165 while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
7e7ab095
MS		 1166 __u64 version;
1167 int cpt;
1168 int cpt2;
d7e09d03
PT		 1169
1170 cpt = lnet_net_lock_current();
1171rescan:
1172 version = the_lnet.ln_routers_version;
1173
1174 list_for_each(entry, &the_lnet.ln_routers) {
1175 rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1176
1177 cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1178 if (cpt != cpt2) {
1179 lnet_net_unlock(cpt);
1180 cpt = cpt2;
1181 lnet_net_lock(cpt);
1182 /* the routers list has changed */
1183 if (version != the_lnet.ln_routers_version)
1184 goto rescan;
1185 }
1186
1187 lnet_ping_router_locked(rtr);
1188
1189 /* NB dropped lock */
1190 if (version != the_lnet.ln_routers_version) {
1191 /* the routers list has changed */
1192 goto rescan;
1193 }
1194 }
1195
1196 if (the_lnet.ln_routing)
1197 lnet_update_ni_status_locked();
1198
1199 lnet_net_unlock(cpt);
1200
1201 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1202
d3caf4d5 1203 /* Call schedule_timeout() here always adds 1 to load average
d7e09d03
PT		 1204 * because kernel counts # active tasks as nr_running
1205 * + nr_uninterruptible. */
18fd5baa
PT		 1206 set_current_state(TASK_INTERRUPTIBLE);
1207 schedule_timeout(cfs_time_seconds(1));
d7e09d03
PT		 1208 }
1209
1210 LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1211
1212 lnet_prune_rc_data(1); /* wait for UNLINK */
1213
1214 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1215 up(&the_lnet.ln_rc_signal);
1216 /* The unlink event callback will signal final completion */
1217 return 0;
1218}
1219
2595fa36 1220static void
d7e09d03
PT		 1221lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1222{
1223 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1224
1225 while (--npages >= 0)
1226 __free_page(rb->rb_kiov[npages].kiov_page);
1227
1228 LIBCFS_FREE(rb, sz);
1229}
1230
2595fa36 1231static lnet_rtrbuf_t *
d7e09d03
PT		 1232lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1233{
7e7ab095
MS		 1234 int npages = rbp->rbp_npages;
1235 int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1236 struct page *page;
d7e09d03 1237 lnet_rtrbuf_t *rb;
7e7ab095 1238 int i;
d7e09d03
PT		 1239
1240 LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1241 if (rb == NULL)
1242 return NULL;
1243
1244 rb->rb_pool = rbp;
1245
1246 for (i = 0; i < npages; i++) {
49c02a75
PT		 1247 page = alloc_pages_node(
1248 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1249 __GFP_ZERO | GFP_IOFS, 0);
d7e09d03
PT		 1250 if (page == NULL) {
1251 while (--i >= 0)
1252 __free_page(rb->rb_kiov[i].kiov_page);
1253
1254 LIBCFS_FREE(rb, sz);
1255 return NULL;
1256 }
1257
1258 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1259 rb->rb_kiov[i].kiov_offset = 0;
1260 rb->rb_kiov[i].kiov_page = page;
1261 }
1262
1263 return rb;
1264}
1265
2595fa36 1266static void
d7e09d03
PT		 1267lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
1268{
7e7ab095
MS		 1269 int npages = rbp->rbp_npages;
1270 int nbuffers = 0;
1271 lnet_rtrbuf_t *rb;
d7e09d03
PT		 1272
1273 if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1274 return;
1275
939af333
HE		 1276 LASSERT(list_empty(&rbp->rbp_msgs));
1277 LASSERT(rbp->rbp_credits == rbp->rbp_nbuffers);
d7e09d03
PT		 1278
1279 while (!list_empty(&rbp->rbp_bufs)) {
939af333 1280 LASSERT(rbp->rbp_credits > 0);
d7e09d03
PT		 1281
1282 rb = list_entry(rbp->rbp_bufs.next,
1283 lnet_rtrbuf_t, rb_list);
1284 list_del(&rb->rb_list);
1285 lnet_destroy_rtrbuf(rb, npages);
1286 nbuffers++;
1287 }
1288
939af333
HE		 1289 LASSERT(rbp->rbp_nbuffers == nbuffers);
1290 LASSERT(rbp->rbp_credits == nbuffers);
d7e09d03
PT		 1291
1292 rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1293}
1294
2595fa36 1295static int
d7e09d03
PT		 1296lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1297{
1298 lnet_rtrbuf_t *rb;
7e7ab095 1299 int i;
d7e09d03
PT		 1300
1301 if (rbp->rbp_nbuffers != 0) {
939af333 1302 LASSERT(rbp->rbp_nbuffers == nbufs);
d7e09d03
PT		 1303 return 0;
1304 }
1305
1306 for (i = 0; i < nbufs; i++) {
1307 rb = lnet_new_rtrbuf(rbp, cpt);
1308
1309 if (rb == NULL) {
1310 CERROR("Failed to allocate %d router bufs of %d pages\n",
1311 nbufs, rbp->rbp_npages);
1312 return -ENOMEM;
1313 }
1314
1315 rbp->rbp_nbuffers++;
1316 rbp->rbp_credits++;
1317 rbp->rbp_mincredits++;
1318 list_add(&rb->rb_list, &rbp->rbp_bufs);
1319
1320 /* No allocation "under fire" */
1321 /* Otherwise we'd need code to schedule blocked msgs etc */
939af333 1322 LASSERT(!the_lnet.ln_routing);
d7e09d03
PT		 1323 }
1324
939af333 1325 LASSERT(rbp->rbp_credits == nbufs);
d7e09d03
PT		 1326 return 0;
1327}
1328
2595fa36 1329static void
d7e09d03
PT		 1330lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1331{
1332 INIT_LIST_HEAD(&rbp->rbp_msgs);
1333 INIT_LIST_HEAD(&rbp->rbp_bufs);
1334
1335 rbp->rbp_npages = npages;
1336 rbp->rbp_credits = 0;
1337 rbp->rbp_mincredits = 0;
1338}
1339
1340void
1341lnet_rtrpools_free(void)
1342{
1343 lnet_rtrbufpool_t *rtrp;
7e7ab095 1344 int i;
d7e09d03
PT		 1345
1346 if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1347 return;
1348
1349 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1350 lnet_rtrpool_free_bufs(&rtrp[0]);
1351 lnet_rtrpool_free_bufs(&rtrp[1]);
1352 lnet_rtrpool_free_bufs(&rtrp[2]);
1353 }
1354
1355 cfs_percpt_free(the_lnet.ln_rtrpools);
1356 the_lnet.ln_rtrpools = NULL;
1357}
1358
1359static int
1360lnet_nrb_tiny_calculate(int npages)
1361{
7e7ab095 1362 int nrbs = LNET_NRB_TINY;
d7e09d03
PT		 1363
1364 if (tiny_router_buffers < 0) {
1365 LCONSOLE_ERROR_MSG(0x10c,
2d00bd17
JP		 1366 "tiny_router_buffers=%d invalid when routing enabled\n",
1367 tiny_router_buffers);
d7e09d03
PT		 1368 return -1;
1369 }
1370
1371 if (tiny_router_buffers > 0)
1372 nrbs = tiny_router_buffers;
1373
1374 nrbs /= LNET_CPT_NUMBER;
1375 return max(nrbs, LNET_NRB_TINY_MIN);
1376}
1377
1378static int
1379lnet_nrb_small_calculate(int npages)
1380{
7e7ab095 1381 int nrbs = LNET_NRB_SMALL;
d7e09d03
PT		 1382
1383 if (small_router_buffers < 0) {
1384 LCONSOLE_ERROR_MSG(0x10c,
2d00bd17
JP		 1385 "small_router_buffers=%d invalid when routing enabled\n",
1386 small_router_buffers);
d7e09d03
PT		 1387 return -1;
1388 }
1389
1390 if (small_router_buffers > 0)
1391 nrbs = small_router_buffers;
1392
1393 nrbs /= LNET_CPT_NUMBER;
1394 return max(nrbs, LNET_NRB_SMALL_MIN);
1395}
1396
1397static int
1398lnet_nrb_large_calculate(int npages)
1399{
7e7ab095 1400 int nrbs = LNET_NRB_LARGE;
d7e09d03
PT		 1401
1402 if (large_router_buffers < 0) {
1403 LCONSOLE_ERROR_MSG(0x10c,
2d00bd17
JP		 1404 "large_router_buffers=%d invalid when routing enabled\n",
1405 large_router_buffers);
d7e09d03
PT		 1406 return -1;
1407 }
1408
1409 if (large_router_buffers > 0)
1410 nrbs = large_router_buffers;
1411
1412 nrbs /= LNET_CPT_NUMBER;
1413 return max(nrbs, LNET_NRB_LARGE_MIN);
1414}
1415
1416int
1417lnet_rtrpools_alloc(int im_a_router)
1418{
1419 lnet_rtrbufpool_t *rtrp;
7e7ab095
MS		 1420 int large_pages;
1421 int small_pages = 1;
1422 int nrb_tiny;
1423 int nrb_small;
1424 int nrb_large;
1425 int rc;
1426 int i;
d7e09d03 1427
e6157b1b
RG		 1428 large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1429
d7e09d03
PT		 1430 if (!strcmp(forwarding, "")) {
1431 /* not set either way */
1432 if (!im_a_router)
1433 return 0;
1434 } else if (!strcmp(forwarding, "disabled")) {
1435 /* explicitly disabled */
1436 return 0;
1437 } else if (!strcmp(forwarding, "enabled")) {
1438 /* explicitly enabled */
1439 } else {
2d00bd17 1440 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either 'enabled' or 'disabled'\n");
d7e09d03
PT		 1441 return -EINVAL;
1442 }
1443
1444 nrb_tiny = lnet_nrb_tiny_calculate(0);
1445 if (nrb_tiny < 0)
1446 return -EINVAL;
1447
1448 nrb_small = lnet_nrb_small_calculate(small_pages);
1449 if (nrb_small < 0)
1450 return -EINVAL;
1451
1452 nrb_large = lnet_nrb_large_calculate(large_pages);
1453 if (nrb_large < 0)
1454 return -EINVAL;
1455
1456 the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1457 LNET_NRBPOOLS *
1458 sizeof(lnet_rtrbufpool_t));
1459 if (the_lnet.ln_rtrpools == NULL) {
1460 LCONSOLE_ERROR_MSG(0x10c,
1461 "Failed to initialize router buffe pool\n");
1462 return -ENOMEM;
1463 }
1464
1465 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1466 lnet_rtrpool_init(&rtrp[0], 0);
1467 rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i);
1468 if (rc != 0)
1469 goto failed;
1470
1471 lnet_rtrpool_init(&rtrp[1], small_pages);
1472 rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i);
1473 if (rc != 0)
1474 goto failed;
1475
1476 lnet_rtrpool_init(&rtrp[2], large_pages);
1477 rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i);
1478 if (rc != 0)
1479 goto failed;
1480 }
1481
1482 lnet_net_lock(LNET_LOCK_EX);
1483 the_lnet.ln_routing = 1;
1484 lnet_net_unlock(LNET_LOCK_EX);
1485
1486 return 0;
1487
1488 failed:
1489 lnet_rtrpools_free();
1490 return rc;
1491}
1492
1493int
a649ad1d 1494lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
d7e09d03 1495{
7e7ab095
MS		 1496 struct lnet_peer *lp = NULL;
1497 unsigned long now = cfs_time_current();
1498 int cpt = lnet_cpt_of_nid(nid);
d7e09d03 1499
939af333 1500 LASSERT(!in_interrupt ());
d7e09d03 1501
939af333 1502 CDEBUG(D_NET, "%s notifying %s: %s\n",
d7e09d03
PT		 1503 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1504 libcfs_nid2str(nid),
1505 alive ? "up" : "down");
1506
1507 if (ni != NULL &&
1508 LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
939af333 1509 CWARN("Ignoring notification of %s %s by %s (different net)\n",
d7e09d03
PT		 1510 libcfs_nid2str(nid), alive ? "birth" : "death",
1511 libcfs_nid2str(ni->ni_nid));
1512 return -EINVAL;
1513 }
1514
1515 /* can't do predictions... */
1516 if (cfs_time_after(when, now)) {
2d00bd17
JP		 1517 CWARN("Ignoring prediction from %s of %s %s %ld seconds in the future\n",
1518 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1519 libcfs_nid2str(nid), alive ? "up" : "down",
1520 cfs_duration_sec(cfs_time_sub(when, now)));
d7e09d03
PT		 1521 return -EINVAL;
1522 }
1523
1524 if (ni != NULL && !alive && /* LND telling me she's down */
1525 !auto_down) { /* auto-down disabled */
1526 CDEBUG(D_NET, "Auto-down disabled\n");
1527 return 0;
1528 }
1529
1530 lnet_net_lock(cpt);
1531
1532 if (the_lnet.ln_shutdown) {
1533 lnet_net_unlock(cpt);
1534 return -ESHUTDOWN;
1535 }
1536
1537 lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1538 if (lp == NULL) {
1539 /* nid not found */
1540 lnet_net_unlock(cpt);
1541 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1542 return 0;
1543 }
1544
1545 /* We can't fully trust LND on reporting exact peer last_alive
1546 * if he notifies us about dead peer. For example ksocklnd can
1547 * call us with when == _time_when_the_node_was_booted_ if
1548 * no connections were successfully established */
1549 if (ni != NULL && !alive && when < lp->lp_last_alive)
1550 when = lp->lp_last_alive;
1551
1552 lnet_notify_locked(lp, ni == NULL, alive, when);
1553
1554 lnet_ni_notify_locked(ni, lp);
1555
1556 lnet_peer_decref_locked(lp);
1557
1558 lnet_net_unlock(cpt);
1559 return 0;
1560}
1561EXPORT_SYMBOL(lnet_notify);
Linux kernel - Deliverables
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