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[fs/lustre-release.git] / lnet / lnet / router.c
1 /*
2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
3  *
4  * Copyright (c) 2011, Whamcloud, Inc.
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 <lnet/lib-lnet.h>
26
27 #if defined(__KERNEL__) && 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 CFS_MODULE_PARM(forwarding, "s", charp, 0444,
38                 "Explicitly enable/disable forwarding between networks");
39
40 static int tiny_router_buffers;
41 CFS_MODULE_PARM(tiny_router_buffers, "i", int, 0444,
42                 "# of 0 payload messages to buffer in the router");
43 static int small_router_buffers;
44 CFS_MODULE_PARM(small_router_buffers, "i", int, 0444,
45                 "# of small (1 page) messages to buffer in the router");
46 static int large_router_buffers;
47 CFS_MODULE_PARM(large_router_buffers, "i", int, 0444,
48                 "# of large messages to buffer in the router");
49 static int peer_buffer_credits = 0;
50 CFS_MODULE_PARM(peer_buffer_credits, "i", int, 0444,
51                 "# router buffer credits per peer");
52
53 static int auto_down = 1;
54 CFS_MODULE_PARM(auto_down, "i", int, 0444,
55                 "Automatically mark peers down on comms error");
56
57 int
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
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 = 0;
84 CFS_MODULE_PARM(check_routers_before_use, "i", int, 0444,
85                 "Assume routers are down and ping them before use");
86
87 static int avoid_asym_router_failure = 0;
88 CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0644,
89                 "Avoid asymmetrical failures: reserved, use at your own risk");
90
91 static int dead_router_check_interval = 0;
92 CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0644,
93                 "Seconds between dead router health checks (<= 0 to disable)");
94
95 static int live_router_check_interval = 0;
96 CFS_MODULE_PARM(live_router_check_interval, "i", int, 0644,
97                 "Seconds between live router health checks (<= 0 to disable)");
98
99 static int router_ping_timeout = 50;
100 CFS_MODULE_PARM(router_ping_timeout, "i", int, 0644,
101                 "Seconds to wait for the reply to a router health query");
102
103 int
104 lnet_peers_start_down(void)
105 {
106         return check_routers_before_use;
107 }
108
109 void
110 lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when)
111 {
112         if (cfs_time_before(when, lp->lp_timestamp)) { /* out of date information */
113                 CDEBUG(D_NET, "Out of date\n");
114                 return;
115         }
116
117         lp->lp_timestamp = when;                /* update timestamp */
118         lp->lp_ping_deadline = 0;               /* disable ping timeout */
119
120         if (lp->lp_alive_count != 0 &&          /* got old news */
121             (!lp->lp_alive) == (!alive)) {      /* new date for old news */
122                 CDEBUG(D_NET, "Old news\n");
123                 return;
124         }
125
126         /* Flag that notification is outstanding */
127
128         lp->lp_alive_count++;
129         lp->lp_alive = !(!alive);               /* 1 bit! */
130         lp->lp_notify = 1;
131         lp->lp_notifylnd |= notifylnd;
132         if (lp->lp_alive)
133                 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
134
135         CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
136 }
137
138 void
139 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
140 {
141         int        alive;
142         int        notifylnd;
143
144         /* Notify only in 1 thread at any time to ensure ordered notification.
145          * NB individual events can be missed; the only guarantee is that you
146          * always get the most recent news */
147
148         if (lp->lp_notifying)
149                 return;
150
151         lp->lp_notifying = 1;
152
153         while (lp->lp_notify) {
154                 alive     = lp->lp_alive;
155                 notifylnd = lp->lp_notifylnd;
156
157                 lp->lp_notifylnd = 0;
158                 lp->lp_notify    = 0;
159
160                 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
161                         lnet_net_unlock(lp->lp_cpt);
162
163                         /* A new notification could happen now; I'll handle it
164                          * when control returns to me */
165
166                         (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
167
168                         lnet_net_lock(lp->lp_cpt);
169                 }
170         }
171
172         lp->lp_notifying = 0;
173 }
174
175
176 static void
177 lnet_rtr_addref_locked(lnet_peer_t *lp)
178 {
179         LASSERT(lp->lp_refcount > 0);
180         LASSERT(lp->lp_rtr_refcount >= 0);
181
182         /* lnet_net_lock must be exclusively locked */
183         lp->lp_rtr_refcount++;
184         if (lp->lp_rtr_refcount == 1) {
185                 cfs_list_t *pos;
186
187                 /* a simple insertion sort */
188                 cfs_list_for_each_prev(pos, &the_lnet.ln_routers) {
189                         lnet_peer_t *rtr = cfs_list_entry(pos, lnet_peer_t,
190                                                           lp_rtr_list);
191
192                         if (rtr->lp_nid < lp->lp_nid)
193                                 break;
194                 }
195
196                 cfs_list_add(&lp->lp_rtr_list, pos);
197                 /* addref for the_lnet.ln_routers */
198                 lnet_peer_addref_locked(lp);
199                 the_lnet.ln_routers_version++;
200         }
201 }
202
203 static void
204 lnet_rtr_decref_locked(lnet_peer_t *lp)
205 {
206         LASSERT(lp->lp_refcount > 0);
207         LASSERT(lp->lp_rtr_refcount > 0);
208
209         /* lnet_net_lock must be exclusively locked */
210         lp->lp_rtr_refcount--;
211         if (lp->lp_rtr_refcount == 0) {
212                 LASSERT(cfs_list_empty(&lp->lp_routes));
213
214                 if (lp->lp_rcd != NULL) {
215                         cfs_list_add(&lp->lp_rcd->rcd_list,
216                                      &the_lnet.ln_rcd_deathrow);
217                         lp->lp_rcd = NULL;
218                 }
219
220                 cfs_list_del(&lp->lp_rtr_list);
221                 /* decref for the_lnet.ln_routers */
222                 lnet_peer_decref_locked(lp);
223                 the_lnet.ln_routers_version++;
224         }
225 }
226
227 lnet_remotenet_t *
228 lnet_find_net_locked (__u32 net)
229 {
230         lnet_remotenet_t *rnet;
231         cfs_list_t       *tmp;
232
233         LASSERT (!the_lnet.ln_shutdown);
234
235         cfs_list_for_each (tmp, &the_lnet.ln_remote_nets) {
236                 rnet = cfs_list_entry(tmp, lnet_remotenet_t, lrn_list);
237
238                 if (rnet->lrn_net == net)
239                         return rnet;
240         }
241         return NULL;
242 }
243
244 static void lnet_shuffle_seed(void)
245 {
246         static int seeded = 0;
247         int lnd_type, seed[2];
248         struct timeval tv;
249         lnet_ni_t *ni;
250         cfs_list_t *tmp;
251
252         if (seeded)
253                 return;
254
255         cfs_get_random_bytes(seed, sizeof(seed));
256
257         /* Nodes with small feet have little entropy
258          * the NID for this node gives the most entropy in the low bits */
259         cfs_list_for_each(tmp, &the_lnet.ln_nis) {
260                 ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
261                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
262
263                 if (lnd_type != LOLND)
264                         seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
265         }
266
267         cfs_gettimeofday(&tv);
268         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
269         seeded = 1;
270         return;
271 }
272
273 /* NB expects LNET_LOCK held */
274 void
275 lnet_add_route_to_rnet (lnet_remotenet_t *rnet, lnet_route_t *route)
276 {
277         unsigned int      len = 0;
278         unsigned int      offset = 0;
279         cfs_list_t       *e;
280
281         lnet_shuffle_seed();
282
283         cfs_list_for_each (e, &rnet->lrn_routes) {
284                 len++;
285         }
286
287         /* len+1 positions to add a new entry, also prevents division by 0 */
288         offset = cfs_rand() % (len + 1);
289         cfs_list_for_each (e, &rnet->lrn_routes) {
290                 if (offset == 0)
291                         break;
292                 offset--;
293         }
294         cfs_list_add(&route->lr_list, e);
295         cfs_list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
296
297         the_lnet.ln_remote_nets_version++;
298         lnet_rtr_addref_locked(route->lr_gateway);
299 }
300
301 int
302 lnet_add_route (__u32 net, unsigned int hops, lnet_nid_t gateway)
303 {
304         cfs_list_t          *e;
305         lnet_remotenet_t    *rnet;
306         lnet_remotenet_t    *rnet2;
307         lnet_route_t        *route;
308         lnet_ni_t           *ni;
309         int                  add_route;
310         int                  rc;
311
312         CDEBUG(D_NET, "Add route: net %s hops %u gw %s\n",
313                libcfs_net2str(net), hops, libcfs_nid2str(gateway));
314
315         if (gateway == LNET_NID_ANY ||
316             LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
317             net == LNET_NIDNET(LNET_NID_ANY) ||
318             LNET_NETTYP(net) == LOLND ||
319             LNET_NIDNET(gateway) == net ||
320             hops < 1 || hops > 255)
321                 return (-EINVAL);
322
323         if (lnet_islocalnet(net))               /* it's a local network */
324                 return 0;                       /* ignore the route entry */
325
326         /* Assume net, route, all new */
327         LIBCFS_ALLOC(route, sizeof(*route));
328         LIBCFS_ALLOC(rnet, sizeof(*rnet));
329         if (route == NULL || rnet == NULL) {
330                 CERROR("Out of memory creating route %s %d %s\n",
331                        libcfs_net2str(net), hops, libcfs_nid2str(gateway));
332                 if (route != NULL)
333                         LIBCFS_FREE(route, sizeof(*route));
334                 if (rnet != NULL)
335                         LIBCFS_FREE(rnet, sizeof(*rnet));
336                 return -ENOMEM;
337         }
338
339         CFS_INIT_LIST_HEAD(&rnet->lrn_routes);
340         rnet->lrn_net = net;
341         route->lr_hops = hops;
342         route->lr_net = net;
343
344         lnet_net_lock(LNET_LOCK_EX);
345
346         rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
347         if (rc != 0) {
348                 lnet_net_unlock(LNET_LOCK_EX);
349
350                 LIBCFS_FREE(route, sizeof(*route));
351                 LIBCFS_FREE(rnet, sizeof(*rnet));
352
353                 if (rc == -EHOSTUNREACH) { /* gateway is not on a local net */
354                         return 0;       /* ignore the route entry */
355                 } else {
356                         CERROR("Error %d creating route %s %d %s\n", rc,
357                                libcfs_net2str(net), hops,
358                                libcfs_nid2str(gateway));
359                 }
360                 return rc;
361         }
362
363         LASSERT (!the_lnet.ln_shutdown);
364
365         rnet2 = lnet_find_net_locked(net);
366         if (rnet2 == NULL) {
367                 /* new network */
368                 cfs_list_add_tail(&rnet->lrn_list, &the_lnet.ln_remote_nets);
369                 rnet2 = rnet;
370         }
371
372         /* Search for a duplicate route (it's a NOOP if it is) */
373         add_route = 1;
374         cfs_list_for_each (e, &rnet2->lrn_routes) {
375                 lnet_route_t *route2 = cfs_list_entry(e, lnet_route_t, lr_list);
376
377                 if (route2->lr_gateway == route->lr_gateway) {
378                         add_route = 0;
379                         break;
380                 }
381
382                 /* our lookups must be true */
383                 LASSERT (route2->lr_gateway->lp_nid != gateway);
384         }
385
386         if (add_route) {
387                 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
388                 lnet_add_route_to_rnet(rnet2, route);
389
390                 ni = route->lr_gateway->lp_ni;
391                 lnet_net_unlock(LNET_LOCK_EX);
392
393                 /* XXX Assume alive */
394                 if (ni->ni_lnd->lnd_notify != NULL)
395                         (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
396
397                 lnet_net_lock(LNET_LOCK_EX);
398         }
399
400         /* -1 for notify or !add_route */
401         lnet_peer_decref_locked(route->lr_gateway);
402         lnet_net_unlock(LNET_LOCK_EX);
403
404         if (!add_route)
405                 LIBCFS_FREE(route, sizeof(*route));
406
407         if (rnet != rnet2)
408                 LIBCFS_FREE(rnet, sizeof(*rnet));
409
410         return 0;
411 }
412
413 int
414 lnet_check_routes(void)
415 {
416         lnet_remotenet_t        *rnet;
417         lnet_route_t            *route;
418         lnet_route_t            *route2;
419         cfs_list_t              *e1;
420         cfs_list_t              *e2;
421         int                     cpt;
422
423         cpt = lnet_net_lock_current();
424
425         cfs_list_for_each(e1, &the_lnet.ln_remote_nets) {
426                 rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
427
428                 route2 = NULL;
429                 cfs_list_for_each(e2, &rnet->lrn_routes) {
430                         lnet_nid_t      nid1;
431                         lnet_nid_t      nid2;
432                         int             net;
433
434                         route = cfs_list_entry(e2, lnet_route_t, lr_list);
435
436                         if (route2 == NULL) {
437                                 route2 = route;
438                                 continue;
439                         }
440
441                         if (route->lr_gateway->lp_ni ==
442                             route2->lr_gateway->lp_ni)
443                                 continue;
444
445                         nid1 = route->lr_gateway->lp_nid;
446                         nid2 = route2->lr_gateway->lp_nid;
447                         net = rnet->lrn_net;
448
449                         lnet_net_unlock(cpt);
450
451                         CERROR("Routes to %s via %s and %s not supported\n",
452                                libcfs_net2str(net), libcfs_nid2str(nid1),
453                                libcfs_nid2str(nid2));
454                         return -EINVAL;
455                 }
456         }
457
458         lnet_net_unlock(cpt);
459         return 0;
460 }
461
462 int
463 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
464 {
465         struct lnet_peer        *gateway;
466         lnet_remotenet_t    *rnet;
467         lnet_route_t        *route;
468         cfs_list_t          *e1;
469         cfs_list_t          *e2;
470         int                  rc = -ENOENT;
471
472         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
473                libcfs_net2str(net), libcfs_nid2str(gw_nid));
474
475         /* NB Caller may specify either all routes via the given gateway
476          * or a specific route entry actual NIDs) */
477
478  again:
479         lnet_net_lock(LNET_LOCK_EX);
480
481         cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
482                 rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
483
484                 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
485                       net == rnet->lrn_net))
486                         continue;
487
488                 cfs_list_for_each (e2, &rnet->lrn_routes) {
489                         route = cfs_list_entry(e2, lnet_route_t, lr_list);
490
491                         gateway = route->lr_gateway;
492                         if (!(gw_nid == LNET_NID_ANY ||
493                               gw_nid == gateway->lp_nid))
494                                 continue;
495
496                         cfs_list_del(&route->lr_list);
497                         cfs_list_del(&route->lr_gwlist);
498                         the_lnet.ln_remote_nets_version++;
499
500                         if (cfs_list_empty(&rnet->lrn_routes))
501                                 cfs_list_del(&rnet->lrn_list);
502                         else
503                                 rnet = NULL;
504
505                         lnet_rtr_decref_locked(gateway);
506                         lnet_peer_decref_locked(gateway);
507
508                         lnet_net_unlock(LNET_LOCK_EX);
509
510                         LIBCFS_FREE(route, sizeof (*route));
511
512                         if (rnet != NULL)
513                                 LIBCFS_FREE(rnet, sizeof(*rnet));
514
515                         rc = 0;
516                         goto again;
517                 }
518         }
519
520         lnet_net_unlock(LNET_LOCK_EX);
521         return rc;
522 }
523
524 void
525 lnet_destroy_routes (void)
526 {
527         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
528 }
529
530 int
531 lnet_get_route(int idx, __u32 *net, __u32 *hops,
532                lnet_nid_t *gateway, __u32 *alive)
533 {
534         cfs_list_t              *e1;
535         cfs_list_t              *e2;
536         lnet_remotenet_t        *rnet;
537         lnet_route_t            *route;
538         int                     cpt;
539
540         cpt = lnet_net_lock_current();
541
542         cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
543                 rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
544
545                 cfs_list_for_each (e2, &rnet->lrn_routes) {
546                         route = cfs_list_entry(e2, lnet_route_t, lr_list);
547
548                         if (idx-- == 0) {
549                                 *net     = rnet->lrn_net;
550                                 *hops    = route->lr_hops;
551                                 *gateway = route->lr_gateway->lp_nid;
552                                 *alive   = route->lr_gateway->lp_alive;
553                                 lnet_net_unlock(cpt);
554                                 return 0;
555                         }
556                 }
557         }
558
559         lnet_net_unlock(cpt);
560         return -ENOENT;
561 }
562
563 void
564 lnet_swap_pinginfo(lnet_ping_info_t *info)
565 {
566         int               i;
567         lnet_ni_status_t *stat;
568
569         __swab32s(&info->pi_magic);
570         __swab32s(&info->pi_features);
571         __swab32s(&info->pi_pid);
572         __swab32s(&info->pi_nnis);
573         for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
574                 stat = &info->pi_ni[i];
575                 __swab64s(&stat->ns_nid);
576                 __swab32s(&stat->ns_status);
577         }
578         return;
579 }
580
581 /**
582  * parse router-checker pinginfo, record number of down NIs for remote
583  * networks on that router.
584  */
585 static void
586 lnet_parse_rc_info(lnet_rc_data_t *rcd)
587 {
588         lnet_ping_info_t        *info = rcd->rcd_pinginfo;
589         struct lnet_peer        *gw   = rcd->rcd_gateway;
590         lnet_route_t            *rtr;
591
592         if (!gw->lp_alive)
593                 return;
594
595         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
596                 lnet_swap_pinginfo(info);
597
598         /* NB always racing with network! */
599         if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
600                 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
601                        libcfs_nid2str(gw->lp_nid), info->pi_magic);
602                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
603                 return;
604         }
605
606         gw->lp_ping_feats = info->pi_features;
607         if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
608                 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
609                        libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
610                 return; /* nothing I can understand */
611         }
612
613         if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
614                 return; /* can't carry NI status info */
615
616         cfs_list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
617                 int     ptl_status = LNET_NI_STATUS_INVALID;
618                 int     down = 0;
619                 int     up = 0;
620                 int     i;
621
622                 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
623                         lnet_ni_status_t *stat = &info->pi_ni[i];
624                         lnet_nid_t       nid = stat->ns_nid;
625
626                         if (nid == LNET_NID_ANY) {
627                                 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
628                                        libcfs_nid2str(gw->lp_nid));
629                                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
630                                 return;
631                         }
632
633                         if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
634                                 continue;
635
636                         if (stat->ns_status == LNET_NI_STATUS_DOWN) {
637                                 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
638                                         down++;
639                                 else if (ptl_status != LNET_NI_STATUS_UP)
640                                         ptl_status = LNET_NI_STATUS_DOWN;
641                                 continue;
642                         }
643
644                         if (stat->ns_status == LNET_NI_STATUS_UP) {
645                                 if (LNET_NIDNET(nid) == rtr->lr_net) {
646                                         up = 1;
647                                         break;
648                                 }
649                                 /* ptl NIs are considered down only when
650                                  * they're all down */
651                                 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
652                                         ptl_status = LNET_NI_STATUS_UP;
653                                 continue;
654                         }
655
656                         CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
657                                libcfs_nid2str(gw->lp_nid), stat->ns_status);
658                         gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
659                         return;
660                 }
661
662                 if (up) { /* ignore downed NIs if NI for dest network is up */
663                         rtr->lr_downis = 0;
664                         continue;
665                 }
666                 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
667         }
668 }
669
670 static void
671 lnet_router_checker_event(lnet_event_t *event)
672 {
673         lnet_rc_data_t          *rcd = event->md.user_ptr;
674         struct lnet_peer        *lp;
675
676         LASSERT(rcd != NULL);
677
678         if (event->unlinked) {
679                 LNetInvalidateHandle(&rcd->rcd_mdh);
680                 return;
681         }
682
683         LASSERT(event->type == LNET_EVENT_SEND ||
684                 event->type == LNET_EVENT_REPLY);
685
686         lp = rcd->rcd_gateway;
687         LASSERT(lp != NULL);
688
689          /* NB: it's called with holding lnet_res_lock, we have a few
690           * places need to hold both locks at the same time, please take
691           * care of lock ordering */
692         lnet_net_lock(lp->lp_cpt);
693         if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
694                 /* ignore if no longer a router or rcd is replaced */
695                 goto out;
696         }
697
698         if (event->type == LNET_EVENT_SEND) {
699                 lp->lp_ping_notsent = 0;
700                 if (event->status == 0)
701                         goto out;
702         }
703
704         /* LNET_EVENT_REPLY */
705         /* A successful REPLY means the router is up.  If _any_ comms
706          * to the router fail I assume it's down (this will happen if
707          * we ping alive routers to try to detect router death before
708          * apps get burned). */
709
710         lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
711         /* The router checker will wake up very shortly and do the
712          * actual notification.
713          * XXX If 'lp' stops being a router before then, it will still
714          * have the notification pending!!! */
715
716         if (avoid_asym_router_failure && event->status == 0)
717                 lnet_parse_rc_info(rcd);
718
719  out:
720         lnet_net_unlock(lp->lp_cpt);
721 }
722
723 void
724 lnet_wait_known_routerstate(void)
725 {
726         lnet_peer_t         *rtr;
727         cfs_list_t          *entry;
728         int                  all_known;
729
730         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
731
732         for (;;) {
733                 int     cpt = lnet_net_lock_current();
734
735                 all_known = 1;
736                 cfs_list_for_each (entry, &the_lnet.ln_routers) {
737                         rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list);
738
739                         if (rtr->lp_alive_count == 0) {
740                                 all_known = 0;
741                                 break;
742                         }
743                 }
744
745                 lnet_net_unlock(cpt);
746
747                 if (all_known)
748                         return;
749
750 #ifndef __KERNEL__
751                 lnet_router_checker();
752 #endif
753                 cfs_pause(cfs_time_seconds(1));
754         }
755 }
756
757 void
758 lnet_update_ni_status_locked(void)
759 {
760         lnet_ni_t       *ni;
761         long            now;
762         int             timeout;
763
764         LASSERT(the_lnet.ln_routing);
765
766         timeout = router_ping_timeout +
767                   MAX(live_router_check_interval, dead_router_check_interval);
768
769         now = cfs_time_current_sec();
770         cfs_list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
771                 if (ni->ni_lnd->lnd_type == LOLND)
772                         continue;
773
774                 if (now < ni->ni_last_alive + timeout)
775                         continue;
776
777                 lnet_ni_lock(ni);
778                 /* re-check with lock */
779                 if (now < ni->ni_last_alive + timeout) {
780                         lnet_ni_unlock(ni);
781                         continue;
782                 }
783
784                 LASSERT(ni->ni_status != NULL);
785
786                 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
787                         CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
788                                libcfs_nid2str(ni->ni_nid), timeout);
789                         /* NB: so far, this is the only place to set
790                          * NI status to "down" */
791                         ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
792                 }
793                 lnet_ni_unlock(ni);
794         }
795 }
796
797 void
798 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
799 {
800         LASSERT(cfs_list_empty(&rcd->rcd_list));
801         /* detached from network */
802         LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
803
804         if (rcd->rcd_gateway != NULL) {
805                 int cpt = rcd->rcd_gateway->lp_cpt;
806
807                 lnet_net_lock(cpt);
808                 lnet_peer_decref_locked(rcd->rcd_gateway);
809                 lnet_net_unlock(cpt);
810         }
811
812         if (rcd->rcd_pinginfo != NULL)
813                 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
814
815         LIBCFS_FREE(rcd, sizeof(*rcd));
816 }
817
818 lnet_rc_data_t *
819 lnet_create_rc_data_locked(lnet_peer_t *gateway)
820 {
821         lnet_rc_data_t          *rcd = NULL;
822         lnet_ping_info_t        *pi;
823         int                     rc;
824         int                     i;
825
826         lnet_net_unlock(gateway->lp_cpt);
827
828         LIBCFS_ALLOC(rcd, sizeof(*rcd));
829         if (rcd == NULL)
830                 goto out;
831
832         LNetInvalidateHandle(&rcd->rcd_mdh);
833         CFS_INIT_LIST_HEAD(&rcd->rcd_list);
834
835         LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
836         if (pi == NULL)
837                 goto out;
838
839         memset(pi, 0, LNET_PINGINFO_SIZE);
840         for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
841                 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
842                 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
843         }
844         rcd->rcd_pinginfo = pi;
845
846         LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
847         rc = LNetMDBind((lnet_md_t){.start     = pi,
848                                     .user_ptr  = rcd,
849                                     .length    = LNET_PINGINFO_SIZE,
850                                     .threshold = LNET_MD_THRESH_INF,
851                                     .options   = LNET_MD_TRUNCATE,
852                                     .eq_handle = the_lnet.ln_rc_eqh},
853                         LNET_UNLINK,
854                         &rcd->rcd_mdh);
855         if (rc < 0) {
856                 CERROR("Can't bind MD: %d\n", rc);
857                 goto out;
858         }
859         LASSERT(rc == 0);
860
861         lnet_net_lock(gateway->lp_cpt);
862         /* router table changed or someone has created rcd for this gateway */
863         if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
864                 lnet_net_unlock(gateway->lp_cpt);
865                 goto out;
866         }
867
868         lnet_peer_addref_locked(gateway);
869         rcd->rcd_gateway = gateway;
870         gateway->lp_rcd = rcd;
871         gateway->lp_ping_notsent = 0;
872
873         return rcd;
874
875  out:
876         if (rcd != NULL) {
877                 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
878                         rc = LNetMDUnlink(rcd->rcd_mdh);
879                         LASSERT(rc == 0);
880                 }
881                 lnet_destroy_rc_data(rcd);
882         }
883
884         lnet_net_lock(gateway->lp_cpt);
885         return gateway->lp_rcd;
886 }
887
888 static int
889 lnet_router_check_interval (lnet_peer_t *rtr)
890 {
891         int secs;
892
893         secs = rtr->lp_alive ? live_router_check_interval :
894                                dead_router_check_interval;
895         if (secs < 0)
896                 secs = 0;
897
898         return secs;
899 }
900
901 static void
902 lnet_ping_router_locked (lnet_peer_t *rtr)
903 {
904         lnet_rc_data_t *rcd = NULL;
905         cfs_time_t      now = cfs_time_current();
906         int             secs;
907
908         lnet_peer_addref_locked(rtr);
909
910         if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
911             cfs_time_after(now, rtr->lp_ping_deadline))
912                 lnet_notify_locked(rtr, 1, 0, now);
913
914         /* Run any outstanding notifications */
915         lnet_ni_notify_locked(rtr->lp_ni, rtr);
916
917         if (!lnet_isrouter(rtr) ||
918             the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
919                 /* router table changed or router checker is shutting down */
920                 lnet_peer_decref_locked(rtr);
921                 return;
922         }
923
924         rcd = rtr->lp_rcd != NULL ?
925               rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
926
927         if (rcd == NULL)
928                 return;
929
930         secs = lnet_router_check_interval(rtr);
931
932         CDEBUG(D_NET,
933                "rtr %s %d: deadline %lu ping_notsent %d alive %d "
934                "alive_count %d lp_ping_timestamp %lu\n",
935                libcfs_nid2str(rtr->lp_nid), secs,
936                rtr->lp_ping_deadline, rtr->lp_ping_notsent,
937                rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
938
939         if (secs != 0 && !rtr->lp_ping_notsent &&
940             cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
941                                              cfs_time_seconds(secs)))) {
942                 int               rc;
943                 lnet_process_id_t id;
944                 lnet_handle_md_t  mdh;
945
946                 id.nid = rtr->lp_nid;
947                 id.pid = LUSTRE_SRV_LNET_PID;
948                 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
949
950                 rtr->lp_ping_notsent   = 1;
951                 rtr->lp_ping_timestamp = now;
952
953                 mdh = rcd->rcd_mdh;
954
955                 if (rtr->lp_ping_deadline == 0) {
956                         rtr->lp_ping_deadline =
957                                 cfs_time_shift(router_ping_timeout);
958                 }
959
960                 lnet_net_unlock(rtr->lp_cpt);
961
962                 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
963                              LNET_PROTO_PING_MATCHBITS, 0);
964
965                 lnet_net_lock(rtr->lp_cpt);
966                 if (rc != 0)
967                         rtr->lp_ping_notsent = 0; /* no event pending */
968         }
969
970         lnet_peer_decref_locked(rtr);
971         return;
972 }
973
974 int
975 lnet_router_checker_start(void)
976 {
977         int          rc;
978         int          eqsz;
979 #ifndef __KERNEL__
980         lnet_peer_t *rtr;
981         __u64        version;
982         int          nrtr = 0;
983         int          router_checker_max_eqsize = 10240;
984
985         LASSERT (check_routers_before_use);
986         LASSERT (dead_router_check_interval > 0);
987
988         lnet_net_lock(0);
989
990         /* As an approximation, allow each router the same number of
991          * outstanding events as it is allowed outstanding sends */
992         eqsz = 0;
993         version = the_lnet.ln_routers_version;
994         cfs_list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
995                 lnet_ni_t         *ni = rtr->lp_ni;
996                 lnet_process_id_t  id;
997
998                 nrtr++;
999                 eqsz += ni->ni_peertxcredits;
1000
1001                 /* one async ping reply per router */
1002                 id.nid = rtr->lp_nid;
1003                 id.pid = LUSTRE_SRV_LNET_PID;
1004
1005                 lnet_net_unlock(0);
1006
1007                 rc = LNetSetAsync(id, 1);
1008                 if (rc != 0) {
1009                         CWARN("LNetSetAsync %s failed: %d\n",
1010                               libcfs_id2str(id), rc);
1011                         return rc;
1012                 }
1013
1014                 lnet_net_lock(0);
1015                 /* NB router list doesn't change in userspace */
1016                 LASSERT(version == the_lnet.ln_routers_version);
1017         }
1018
1019         lnet_net_unlock(0);
1020
1021         if (nrtr == 0) {
1022                 CDEBUG(D_NET,
1023                        "No router found, not starting router checker\n");
1024                 return 0;
1025         }
1026
1027         /* at least allow a SENT and a REPLY per router */
1028         if (router_checker_max_eqsize < 2 * nrtr)
1029                 router_checker_max_eqsize = 2 * nrtr;
1030
1031         LASSERT (eqsz > 0);
1032         if (eqsz > router_checker_max_eqsize)
1033                 eqsz = router_checker_max_eqsize;
1034 #endif
1035
1036         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1037
1038         if (check_routers_before_use &&
1039             dead_router_check_interval <= 0) {
1040                 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
1041                                    " set if 'check_routers_before_use' is set"
1042                                    "\n");
1043                 return -EINVAL;
1044         }
1045
1046         if (!the_lnet.ln_routing &&
1047             live_router_check_interval <= 0 &&
1048             dead_router_check_interval <= 0)
1049                 return 0;
1050
1051 #ifdef __KERNEL__
1052         cfs_sema_init(&the_lnet.ln_rc_signal, 0);
1053         /* EQ size doesn't matter; the callback is guaranteed to get every
1054          * event */
1055         eqsz = 0;
1056         rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1057                          &the_lnet.ln_rc_eqh);
1058 #else
1059         rc = LNetEQAlloc(eqsz, LNET_EQ_HANDLER_NONE,
1060                          &the_lnet.ln_rc_eqh);
1061 #endif
1062         if (rc != 0) {
1063                 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1064                 return -ENOMEM;
1065         }
1066
1067         the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1068 #ifdef __KERNEL__
1069         rc = cfs_create_thread(lnet_router_checker, NULL, 0);
1070         if (rc < 0) {
1071                 CERROR("Can't start router checker thread: %d\n", rc);
1072                 /* block until event callback signals exit */
1073                 cfs_down(&the_lnet.ln_rc_signal);
1074                 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1075                 LASSERT (rc == 0);
1076                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1077                 return -ENOMEM;
1078         }
1079 #endif
1080
1081         if (check_routers_before_use) {
1082                 /* Note that a helpful side-effect of pinging all known routers
1083                  * at startup is that it makes them drop stale connections they
1084                  * may have to a previous instance of me. */
1085                 lnet_wait_known_routerstate();
1086         }
1087
1088         return 0;
1089 }
1090
1091 void
1092 lnet_router_checker_stop (void)
1093 {
1094         int rc;
1095
1096         if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1097                 return;
1098
1099         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1100         the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1101
1102 #ifdef __KERNEL__
1103         /* block until event callback signals exit */
1104         cfs_down(&the_lnet.ln_rc_signal);
1105 #else
1106         lnet_router_checker();
1107 #endif
1108         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1109
1110         rc = LNetEQFree(the_lnet.ln_rc_eqh);
1111         LASSERT (rc == 0);
1112         return;
1113 }
1114
1115 static void
1116 lnet_prune_rc_data(int wait_unlink)
1117 {
1118         lnet_rc_data_t          *rcd;
1119         lnet_rc_data_t          *tmp;
1120         lnet_peer_t             *lp;
1121         cfs_list_t              head;
1122         int                     i = 2;
1123
1124         if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1125                    cfs_list_empty(&the_lnet.ln_rcd_deathrow) &&
1126                    cfs_list_empty(&the_lnet.ln_rcd_zombie)))
1127                 return;
1128
1129         CFS_INIT_LIST_HEAD(&head);
1130
1131         lnet_net_lock(LNET_LOCK_EX);
1132
1133         if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1134                 /* router checker is stopping, prune all */
1135                 cfs_list_for_each_entry(lp, &the_lnet.ln_routers,
1136                                         lp_rtr_list) {
1137                         if (lp->lp_rcd == NULL)
1138                                 continue;
1139
1140                         LASSERT(cfs_list_empty(&lp->lp_rcd->rcd_list));
1141                         cfs_list_add(&lp->lp_rcd->rcd_list,
1142                                      &the_lnet.ln_rcd_deathrow);
1143                         lp->lp_rcd = NULL;
1144                 }
1145         }
1146
1147         /* unlink all RCDs on deathrow list */
1148         cfs_list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1149
1150         if (!cfs_list_empty(&head)) {
1151                 lnet_net_unlock(LNET_LOCK_EX);
1152
1153                 cfs_list_for_each_entry(rcd, &head, rcd_list)
1154                         LNetMDUnlink(rcd->rcd_mdh);
1155
1156                 lnet_net_lock(LNET_LOCK_EX);
1157         }
1158
1159         cfs_list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1160
1161         /* release all zombie RCDs */
1162         while (!cfs_list_empty(&the_lnet.ln_rcd_zombie)) {
1163                 cfs_list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1164                                              rcd_list) {
1165                         if (LNetHandleIsInvalid(rcd->rcd_mdh))
1166                                 cfs_list_move(&rcd->rcd_list, &head);
1167                 }
1168
1169                 wait_unlink = wait_unlink &&
1170                               !cfs_list_empty(&the_lnet.ln_rcd_zombie);
1171
1172                 lnet_net_unlock(LNET_LOCK_EX);
1173
1174                 while (!cfs_list_empty(&head)) {
1175                         rcd = cfs_list_entry(head.next,
1176                                              lnet_rc_data_t, rcd_list);
1177                         cfs_list_del_init(&rcd->rcd_list);
1178                         lnet_destroy_rc_data(rcd);
1179                 }
1180
1181                 if (!wait_unlink)
1182                         return;
1183
1184                 i++;
1185                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1186                        "Waiting for rc buffers to unlink\n");
1187                 cfs_pause(cfs_time_seconds(1) / 4);
1188
1189                 lnet_net_lock(LNET_LOCK_EX);
1190         }
1191
1192         lnet_net_unlock(LNET_LOCK_EX);
1193 }
1194
1195
1196 #if defined(__KERNEL__) && defined(LNET_ROUTER)
1197
1198 static int
1199 lnet_router_checker(void *arg)
1200 {
1201         lnet_peer_t       *rtr;
1202         cfs_list_t        *entry;
1203
1204         cfs_daemonize("router_checker");
1205         cfs_block_allsigs();
1206
1207         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1208
1209         while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1210                 __u64   version;
1211                 int     cpt;
1212                 int     cpt2;
1213
1214                 cpt = lnet_net_lock_current();
1215 rescan:
1216                 version = the_lnet.ln_routers_version;
1217
1218                 cfs_list_for_each(entry, &the_lnet.ln_routers) {
1219                         rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list);
1220
1221                         cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1222                         if (cpt != cpt2) {
1223                                 lnet_net_unlock(cpt);
1224                                 cpt = cpt2;
1225                                 lnet_net_lock(cpt);
1226                                 /* the routers list has changed */
1227                                 if (version != the_lnet.ln_routers_version)
1228                                         goto rescan;
1229                         }
1230
1231                         lnet_ping_router_locked(rtr);
1232
1233                         /* NB dropped lock */
1234                         if (version != the_lnet.ln_routers_version) {
1235                                 /* the routers list has changed */
1236                                 goto rescan;
1237                         }
1238                 }
1239
1240                 if (the_lnet.ln_routing)
1241                         lnet_update_ni_status_locked();
1242
1243                 lnet_net_unlock(cpt);
1244
1245                 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1246
1247                 /* Call cfs_pause() here always adds 1 to load average 
1248                  * because kernel counts # active tasks as nr_running 
1249                  * + nr_uninterruptible. */
1250                 cfs_schedule_timeout_and_set_state(CFS_TASK_INTERRUPTIBLE,
1251                                                    cfs_time_seconds(1));
1252         }
1253
1254         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1255
1256         lnet_prune_rc_data(1); /* wait for UNLINK */
1257
1258         the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1259         cfs_up(&the_lnet.ln_rc_signal);
1260         /* The unlink event callback will signal final completion */
1261         return 0;
1262 }
1263
1264 void
1265 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1266 {
1267         int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1268
1269         while (--npages >= 0)
1270                 cfs_free_page(rb->rb_kiov[npages].kiov_page);
1271
1272         LIBCFS_FREE(rb, sz);
1273 }
1274
1275 lnet_rtrbuf_t *
1276 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1277 {
1278         int            npages = rbp->rbp_npages;
1279         int            sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1280         struct page   *page;
1281         lnet_rtrbuf_t *rb;
1282         int            i;
1283
1284         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1285         if (rb == NULL)
1286                 return NULL;
1287
1288         rb->rb_pool = rbp;
1289
1290         for (i = 0; i < npages; i++) {
1291                 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1292                                           CFS_ALLOC_ZERO | CFS_ALLOC_STD);
1293                 if (page == NULL) {
1294                         while (--i >= 0)
1295                                 cfs_free_page(rb->rb_kiov[i].kiov_page);
1296
1297                         LIBCFS_FREE(rb, sz);
1298                         return NULL;
1299                 }
1300
1301                 rb->rb_kiov[i].kiov_len = CFS_PAGE_SIZE;
1302                 rb->rb_kiov[i].kiov_offset = 0;
1303                 rb->rb_kiov[i].kiov_page = page;
1304         }
1305
1306         return rb;
1307 }
1308
1309 void
1310 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
1311 {
1312         int             npages = rbp->rbp_npages;
1313         int             nbuffers = 0;
1314         lnet_rtrbuf_t   *rb;
1315
1316         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1317                 return;
1318
1319         LASSERT (cfs_list_empty(&rbp->rbp_msgs));
1320         LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers);
1321
1322         while (!cfs_list_empty(&rbp->rbp_bufs)) {
1323                 LASSERT (rbp->rbp_credits > 0);
1324
1325                 rb = cfs_list_entry(rbp->rbp_bufs.next,
1326                                     lnet_rtrbuf_t, rb_list);
1327                 cfs_list_del(&rb->rb_list);
1328                 lnet_destroy_rtrbuf(rb, npages);
1329                 nbuffers++;
1330         }
1331
1332         LASSERT (rbp->rbp_nbuffers == nbuffers);
1333         LASSERT (rbp->rbp_credits == nbuffers);
1334
1335         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1336 }
1337
1338 int
1339 lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1340 {
1341         lnet_rtrbuf_t *rb;
1342         int            i;
1343
1344         if (rbp->rbp_nbuffers != 0) {
1345                 LASSERT (rbp->rbp_nbuffers == nbufs);
1346                 return 0;
1347         }
1348
1349         for (i = 0; i < nbufs; i++) {
1350                 rb = lnet_new_rtrbuf(rbp, cpt);
1351
1352                 if (rb == NULL) {
1353                         CERROR("Failed to allocate %d router bufs of %d pages\n",
1354                                nbufs, rbp->rbp_npages);
1355                         return -ENOMEM;
1356                 }
1357
1358                 rbp->rbp_nbuffers++;
1359                 rbp->rbp_credits++;
1360                 rbp->rbp_mincredits++;
1361                 cfs_list_add(&rb->rb_list, &rbp->rbp_bufs);
1362
1363                 /* No allocation "under fire" */
1364                 /* Otherwise we'd need code to schedule blocked msgs etc */
1365                 LASSERT (!the_lnet.ln_routing);
1366         }
1367
1368         LASSERT (rbp->rbp_credits == nbufs);
1369         return 0;
1370 }
1371
1372 void
1373 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1374 {
1375         CFS_INIT_LIST_HEAD(&rbp->rbp_msgs);
1376         CFS_INIT_LIST_HEAD(&rbp->rbp_bufs);
1377
1378         rbp->rbp_npages = npages;
1379         rbp->rbp_credits = 0;
1380         rbp->rbp_mincredits = 0;
1381 }
1382
1383 void
1384 lnet_rtrpools_free(void)
1385 {
1386         lnet_rtrbufpool_t *rtrp;
1387         int               i;
1388
1389         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1390                 return;
1391
1392         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1393                 lnet_rtrpool_free_bufs(&rtrp[0]);
1394                 lnet_rtrpool_free_bufs(&rtrp[1]);
1395                 lnet_rtrpool_free_bufs(&rtrp[2]);
1396         }
1397
1398         cfs_percpt_free(the_lnet.ln_rtrpools);
1399         the_lnet.ln_rtrpools = NULL;
1400 }
1401
1402 static int
1403 lnet_nrb_tiny_calculate(int npages)
1404 {
1405         int     nrbs = LNET_NRB_TINY;
1406
1407         if (tiny_router_buffers < 0) {
1408                 LCONSOLE_ERROR_MSG(0x10c,
1409                                    "tiny_router_buffers=%d invalid when "
1410                                    "routing enabled\n", tiny_router_buffers);
1411                 return -1;
1412         }
1413
1414         if (tiny_router_buffers > 0)
1415                 nrbs = tiny_router_buffers;
1416
1417         nrbs /= LNET_CPT_NUMBER;
1418         return max(nrbs, LNET_NRB_TINY_MIN);
1419 }
1420
1421 static int
1422 lnet_nrb_small_calculate(int npages)
1423 {
1424         int     nrbs = LNET_NRB_SMALL;
1425
1426         if (small_router_buffers < 0) {
1427                 LCONSOLE_ERROR_MSG(0x10c,
1428                                    "small_router_buffers=%d invalid when "
1429                                    "routing enabled\n", small_router_buffers);
1430                 return -1;
1431         }
1432
1433         if (small_router_buffers > 0)
1434                 nrbs = small_router_buffers;
1435
1436         nrbs /= LNET_CPT_NUMBER;
1437         return max(nrbs, LNET_NRB_SMALL_MIN);
1438 }
1439
1440 static int
1441 lnet_nrb_large_calculate(int npages)
1442 {
1443         int     nrbs = LNET_NRB_LARGE;
1444
1445         if (large_router_buffers < 0) {
1446                 LCONSOLE_ERROR_MSG(0x10c,
1447                                    "large_router_buffers=%d invalid when "
1448                                    "routing enabled\n", large_router_buffers);
1449                 return -1;
1450         }
1451
1452         if (large_router_buffers > 0)
1453                 nrbs = large_router_buffers;
1454
1455         nrbs /= LNET_CPT_NUMBER;
1456         return max(nrbs, LNET_NRB_LARGE_MIN);
1457 }
1458
1459 int
1460 lnet_rtrpools_alloc(int im_a_router)
1461 {
1462         lnet_rtrbufpool_t *rtrp;
1463         int     large_pages = (LNET_MTU + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
1464         int     small_pages = 1;
1465         int     nrb_tiny;
1466         int     nrb_small;
1467         int     nrb_large;
1468         int     rc;
1469         int     i;
1470
1471         if (!strcmp(forwarding, "")) {
1472                 /* not set either way */
1473                 if (!im_a_router)
1474                         return 0;
1475         } else if (!strcmp(forwarding, "disabled")) {
1476                 /* explicitly disabled */
1477                 return 0;
1478         } else if (!strcmp(forwarding, "enabled")) {
1479                 /* explicitly enabled */
1480         } else {
1481                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1482                                    "'enabled' or 'disabled'\n");
1483                 return -EINVAL;
1484         }
1485
1486         nrb_tiny = lnet_nrb_tiny_calculate(0);
1487         if (nrb_tiny < 0)
1488                 return -EINVAL;
1489
1490         nrb_small = lnet_nrb_small_calculate(small_pages);
1491         if (nrb_small < 0)
1492                 return -EINVAL;
1493
1494         nrb_large = lnet_nrb_large_calculate(large_pages);
1495         if (nrb_large < 0)
1496                 return -EINVAL;
1497
1498         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1499                                                 LNET_NRBPOOLS *
1500                                                 sizeof(lnet_rtrbufpool_t));
1501         if (the_lnet.ln_rtrpools == NULL) {
1502                 LCONSOLE_ERROR_MSG(0x10c,
1503                                    "Failed to initialize router buffe pool\n");
1504                 return -ENOMEM;
1505         }
1506
1507         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1508                 lnet_rtrpool_init(&rtrp[0], 0);
1509                 rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i);
1510                 if (rc != 0)
1511                         goto failed;
1512
1513                 lnet_rtrpool_init(&rtrp[1], small_pages);
1514                 rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i);
1515                 if (rc != 0)
1516                         goto failed;
1517
1518                 lnet_rtrpool_init(&rtrp[2], large_pages);
1519                 rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i);
1520                 if (rc != 0)
1521                         goto failed;
1522         }
1523
1524         lnet_net_lock(LNET_LOCK_EX);
1525         the_lnet.ln_routing = 1;
1526         lnet_net_unlock(LNET_LOCK_EX);
1527
1528         return 0;
1529
1530  failed:
1531         lnet_rtrpools_free();
1532         return rc;
1533 }
1534
1535 int
1536 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1537 {
1538         struct lnet_peer        *lp = NULL;
1539         cfs_time_t              now = cfs_time_current();
1540         int                     cpt = lnet_cpt_of_nid(nid);
1541
1542         LASSERT (!cfs_in_interrupt ());
1543
1544         CDEBUG (D_NET, "%s notifying %s: %s\n",
1545                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1546                 libcfs_nid2str(nid),
1547                 alive ? "up" : "down");
1548
1549         if (ni != NULL &&
1550             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1551                 CWARN ("Ignoring notification of %s %s by %s (different net)\n",
1552                         libcfs_nid2str(nid), alive ? "birth" : "death",
1553                         libcfs_nid2str(ni->ni_nid));
1554                 return -EINVAL;
1555         }
1556
1557         /* can't do predictions... */
1558         if (cfs_time_after(when, now)) {
1559                 CWARN ("Ignoring prediction from %s of %s %s "
1560                        "%ld seconds in the future\n",
1561                        (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1562                        libcfs_nid2str(nid), alive ? "up" : "down",
1563                        cfs_duration_sec(cfs_time_sub(when, now)));
1564                 return -EINVAL;
1565         }
1566
1567         if (ni != NULL && !alive &&             /* LND telling me she's down */
1568             !auto_down) {                       /* auto-down disabled */
1569                 CDEBUG(D_NET, "Auto-down disabled\n");
1570                 return 0;
1571         }
1572
1573         lnet_net_lock(cpt);
1574
1575         if (the_lnet.ln_shutdown) {
1576                 lnet_net_unlock(cpt);
1577                 return -ESHUTDOWN;
1578         }
1579
1580         lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1581         if (lp == NULL) {
1582                 /* nid not found */
1583                 lnet_net_unlock(cpt);
1584                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1585                 return 0;
1586         }
1587
1588         /* We can't fully trust LND on reporting exact peer last_alive
1589          * if he notifies us about dead peer. For example ksocklnd can
1590          * call us with when == _time_when_the_node_was_booted_ if
1591          * no connections were successfully established */
1592         if (ni != NULL && !alive && when < lp->lp_last_alive)
1593                 when = lp->lp_last_alive;
1594
1595         lnet_notify_locked(lp, ni == NULL, alive, when);
1596
1597         lnet_ni_notify_locked(ni, lp);
1598
1599         lnet_peer_decref_locked(lp);
1600
1601         lnet_net_unlock(cpt);
1602         return 0;
1603 }
1604 EXPORT_SYMBOL(lnet_notify);
1605
1606 void
1607 lnet_get_tunables (void)
1608 {
1609         return;
1610 }
1611
1612 #else
1613
1614 int
1615 lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1616 {
1617         return -EOPNOTSUPP;
1618 }
1619
1620 void
1621 lnet_router_checker (void)
1622 {
1623         static time_t last = 0;
1624         static int    running = 0;
1625
1626         time_t            now = cfs_time_current_sec();
1627         int               interval = now - last;
1628         int               rc;
1629         __u64             version;
1630         lnet_peer_t      *rtr;
1631
1632         /* It's no use to call me again within a sec - all intervals and
1633          * timeouts are measured in seconds */
1634         if (last != 0 && interval < 2)
1635                 return;
1636
1637         if (last != 0 &&
1638             interval > MAX(live_router_check_interval,
1639                            dead_router_check_interval))
1640                 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1641                         live_router_check_interval, dead_router_check_interval,
1642                         interval);
1643
1644         LASSERT(LNET_CPT_NUMBER == 1);
1645
1646         lnet_net_lock(0);
1647         LASSERT(!running); /* recursion check */
1648         running = 1;
1649         lnet_net_unlock(0);
1650
1651         last = now;
1652
1653         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1654                 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1655
1656         /* consume all pending events */
1657         while (1) {
1658                 int          i;
1659                 lnet_event_t ev;
1660
1661                 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1662                  * recursion breaker in LNetEQPoll would fail */
1663                 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1664                 if (rc == 0)   /* no event pending */
1665                         break;
1666
1667                 /* NB a lost SENT prevents me from pinging a router again */
1668                 if (rc == -EOVERFLOW) {
1669                         CERROR("Dropped an event!!!\n");
1670                         abort();
1671                 }
1672
1673                 LASSERT (rc == 1);
1674
1675                 lnet_router_checker_event(&ev);
1676         }
1677
1678         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1679                 lnet_prune_rc_data(1); /* release rcd */
1680                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1681                 running = 0;
1682                 return;
1683         }
1684
1685         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1686
1687         lnet_net_lock(0);
1688
1689         version = the_lnet.ln_routers_version;
1690         cfs_list_for_each_entry (rtr, &the_lnet.ln_routers, lp_rtr_list) {
1691                 lnet_ping_router_locked(rtr);
1692                 LASSERT (version == the_lnet.ln_routers_version);
1693         }
1694
1695         lnet_net_unlock(0);
1696
1697         running = 0; /* lock only needed for the recursion check */
1698         return;
1699 }
1700
1701 /* NB lnet_peers_start_down depends on me,
1702  * so must be called before any peer creation */
1703 void
1704 lnet_get_tunables (void)
1705 {
1706         char *s;
1707
1708         s = getenv("LNET_ROUTER_PING_TIMEOUT");
1709         if (s != NULL) router_ping_timeout = atoi(s);
1710
1711         s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1712         if (s != NULL) live_router_check_interval = atoi(s);
1713
1714         s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1715         if (s != NULL) dead_router_check_interval = atoi(s);
1716
1717         /* This replaces old lnd_notify mechanism */
1718         check_routers_before_use = 1;
1719         if (dead_router_check_interval <= 0)
1720                 dead_router_check_interval = 30;
1721 }
1722
1723 void
1724 lnet_rtrpools_free(void)
1725 {
1726 }
1727
1728 int
1729 lnet_rtrpools_alloc(int im_a_arouter)
1730 {
1731         return 0;
1732 }
1733
1734 #endif