drivers/staging/lustre/lnet/lnet/router.c

   1 /*
   2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Copyright (c) 2011, 2012, Intel Corporation.
   5  *
   6  *   This file is part of Portals
   7  *   http://sourceforge.net/projects/sandiaportals/
   8  *
   9  *   Portals is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Portals is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Portals; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LNET
  25 #include "../../include/linux/lnet/lib-lnet.h"
  26
  27 #if  defined(LNET_ROUTER)
  28
  29 #define LNET_NRB_TINY_MIN       512     /* min value for each CPT */
  30 #define LNET_NRB_TINY           (LNET_NRB_TINY_MIN * 4)
  31 #define LNET_NRB_SMALL_MIN      4096    /* min value for each CPT */
  32 #define LNET_NRB_SMALL          (LNET_NRB_SMALL_MIN * 4)
  33 #define LNET_NRB_LARGE_MIN      256     /* min value for each CPT */
  34 #define LNET_NRB_LARGE          (LNET_NRB_LARGE_MIN * 4)
  35
  36 static char *forwarding = "";
  37 module_param(forwarding, charp, 0444);
  38 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
  39
  40 static int tiny_router_buffers;
  41 module_param(tiny_router_buffers, int, 0444);
  42 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
  43 static int small_router_buffers;
  44 module_param(small_router_buffers, int, 0444);
  45 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
  46 static int large_router_buffers;
  47 module_param(large_router_buffers, int, 0444);
  48 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
  49 static int peer_buffer_credits = 0;
  50 module_param(peer_buffer_credits, int, 0444);
  51 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
  52
  53 static int auto_down = 1;
  54 module_param(auto_down, int, 0444);
  55 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
  56
  57 int
  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 module_param(check_routers_before_use, int, 0444);
  85 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
  86
  87 static int avoid_asym_router_failure = 1;
  88 module_param(avoid_asym_router_failure, int, 0644);
  89 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
  90
  91 static int dead_router_check_interval = 60;
  92 module_param(dead_router_check_interval, int, 0644);
  93 MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
  94
  95 static int live_router_check_interval = 60;
  96 module_param(live_router_check_interval, int, 0644);
  97 MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
  98
  99 static int router_ping_timeout = 50;
 100 module_param(router_ping_timeout, int, 0644);
 101 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
 102
 103 int
 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, unsigned long when)
 111 {
 112         if (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 static 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 || ni == NULL)
 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                 struct list_head *pos;
 186
 187                 /* a simple insertion sort */
 188                 list_for_each_prev(pos, &the_lnet.ln_routers) {
 189                         lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
 190                                                           lp_rtr_list);
 191
 192                         if (rtr->lp_nid < lp->lp_nid)
 193                                 break;
 194                 }
 195
 196                 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(list_empty(&lp->lp_routes));
 213
 214                 if (lp->lp_rcd != NULL) {
 215                         list_add(&lp->lp_rcd->rcd_list,
 216                                      &the_lnet.ln_rcd_deathrow);
 217                         lp->lp_rcd = NULL;
 218                 }
 219
 220                 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         struct list_head                *tmp;
 232         struct list_head                *rn_list;
 233
 234         LASSERT(!the_lnet.ln_shutdown);
 235
 236         rn_list = lnet_net2rnethash(net);
 237         list_for_each(tmp, rn_list) {
 238                 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
 239
 240                 if (rnet->lrn_net == net)
 241                         return rnet;
 242         }
 243         return NULL;
 244 }
 245
 246 static void lnet_shuffle_seed(void)
 247 {
 248         static int seeded = 0;
 249         int lnd_type, seed[2];
 250         struct timeval tv;
 251         lnet_ni_t *ni;
 252         struct list_head *tmp;
 253
 254         if (seeded)
 255                 return;
 256
 257         cfs_get_random_bytes(seed, sizeof(seed));
 258
 259         /* Nodes with small feet have little entropy
 260          * the NID for this node gives the most entropy in the low bits */
 261         list_for_each(tmp, &the_lnet.ln_nis) {
 262                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 263                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
 264
 265                 if (lnd_type != LOLND)
 266                         seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
 267         }
 268
 269         do_gettimeofday(&tv);
 270         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 271         seeded = 1;
 272         return;
 273 }
 274
 275 /* NB expects LNET_LOCK held */
 276 static void
 277 lnet_add_route_to_rnet (lnet_remotenet_t *rnet, lnet_route_t *route)
 278 {
 279         unsigned int      len = 0;
 280         unsigned int      offset = 0;
 281         struct list_head       *e;
 282
 283         lnet_shuffle_seed();
 284
 285         list_for_each (e, &rnet->lrn_routes) {
 286                 len++;
 287         }
 288
 289         /* len+1 positions to add a new entry, also prevents division by 0 */
 290         offset = cfs_rand() % (len + 1);
 291         list_for_each (e, &rnet->lrn_routes) {
 292                 if (offset == 0)
 293                         break;
 294                 offset--;
 295         }
 296         list_add(&route->lr_list, e);
 297         list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
 298
 299         the_lnet.ln_remote_nets_version++;
 300         lnet_rtr_addref_locked(route->lr_gateway);
 301 }
 302
 303 int
 304 lnet_add_route(__u32 net, unsigned int hops, lnet_nid_t gateway,
 305                unsigned int priority)
 306 {
 307         struct list_head          *e;
 308         lnet_remotenet_t    *rnet;
 309         lnet_remotenet_t    *rnet2;
 310         lnet_route_t    *route;
 311         lnet_ni_t          *ni;
 312         int               add_route;
 313         int               rc;
 314
 315         CDEBUG(D_NET, "Add route: net %s hops %u priority %u gw %s\n",
 316                libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
 317
 318         if (gateway == LNET_NID_ANY ||
 319             LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
 320             net == LNET_NIDNET(LNET_NID_ANY) ||
 321             LNET_NETTYP(net) == LOLND ||
 322             LNET_NIDNET(gateway) == net ||
 323             hops < 1 || hops > 255)
 324                 return -EINVAL;
 325
 326         if (lnet_islocalnet(net))              /* it's a local network */
 327                 return 0;                      /* ignore the route entry */
 328
 329         /* Assume net, route, all new */
 330         LIBCFS_ALLOC(route, sizeof(*route));
 331         LIBCFS_ALLOC(rnet, sizeof(*rnet));
 332         if (route == NULL || rnet == NULL) {
 333                 CERROR("Out of memory creating route %s %d %s\n",
 334                        libcfs_net2str(net), hops, libcfs_nid2str(gateway));
 335                 if (route != NULL)
 336                         LIBCFS_FREE(route, sizeof(*route));
 337                 if (rnet != NULL)
 338                         LIBCFS_FREE(rnet, sizeof(*rnet));
 339                 return -ENOMEM;
 340         }
 341
 342         INIT_LIST_HEAD(&rnet->lrn_routes);
 343         rnet->lrn_net = net;
 344         route->lr_hops = hops;
 345         route->lr_net = net;
 346         route->lr_priority = priority;
 347
 348         lnet_net_lock(LNET_LOCK_EX);
 349
 350         rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX);
 351         if (rc != 0) {
 352                 lnet_net_unlock(LNET_LOCK_EX);
 353
 354                 LIBCFS_FREE(route, sizeof(*route));
 355                 LIBCFS_FREE(rnet, sizeof(*rnet));
 356
 357                 if (rc == -EHOSTUNREACH) { /* gateway is not on a local net */
 358                         return 0;       /* ignore the route entry */
 359                 } else {
 360                         CERROR("Error %d creating route %s %d %s\n", rc,
 361                                libcfs_net2str(net), hops,
 362                                libcfs_nid2str(gateway));
 363                 }
 364                 return rc;
 365         }
 366
 367         LASSERT (!the_lnet.ln_shutdown);
 368
 369         rnet2 = lnet_find_net_locked(net);
 370         if (rnet2 == NULL) {
 371                 /* new network */
 372                 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
 373                 rnet2 = rnet;
 374         }
 375
 376         /* Search for a duplicate route (it's a NOOP if it is) */
 377         add_route = 1;
 378         list_for_each (e, &rnet2->lrn_routes) {
 379                 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
 380
 381                 if (route2->lr_gateway == route->lr_gateway) {
 382                         add_route = 0;
 383                         break;
 384                 }
 385
 386                 /* our lookups must be true */
 387                 LASSERT (route2->lr_gateway->lp_nid != gateway);
 388         }
 389
 390         if (add_route) {
 391                 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
 392                 lnet_add_route_to_rnet(rnet2, route);
 393
 394                 ni = route->lr_gateway->lp_ni;
 395                 lnet_net_unlock(LNET_LOCK_EX);
 396
 397                 /* XXX Assume alive */
 398                 if (ni->ni_lnd->lnd_notify != NULL)
 399                         (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
 400
 401                 lnet_net_lock(LNET_LOCK_EX);
 402         }
 403
 404         /* -1 for notify or !add_route */
 405         lnet_peer_decref_locked(route->lr_gateway);
 406         lnet_net_unlock(LNET_LOCK_EX);
 407
 408         if (!add_route)
 409                 LIBCFS_FREE(route, sizeof(*route));
 410
 411         if (rnet != rnet2)
 412                 LIBCFS_FREE(rnet, sizeof(*rnet));
 413
 414         return 0;
 415 }
 416
 417 int
 418 lnet_check_routes(void)
 419 {
 420         lnet_remotenet_t        *rnet;
 421         lnet_route_t            *route;
 422         lnet_route_t            *route2;
 423         struct list_head                *e1;
 424         struct list_head                *e2;
 425         int                     cpt;
 426         struct list_head                *rn_list;
 427         int                     i;
 428
 429         cpt = lnet_net_lock_current();
 430
 431         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 432                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 433                 list_for_each(e1, rn_list) {
 434                         rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 435
 436                         route2 = NULL;
 437                         list_for_each(e2, &rnet->lrn_routes) {
 438                                 lnet_nid_t      nid1;
 439                                 lnet_nid_t      nid2;
 440                                 int             net;
 441
 442                                 route = list_entry(e2, lnet_route_t,
 443                                                        lr_list);
 444
 445                                 if (route2 == NULL) {
 446                                         route2 = route;
 447                                         continue;
 448                                 }
 449
 450                                 if (route->lr_gateway->lp_ni ==
 451                                     route2->lr_gateway->lp_ni)
 452                                         continue;
 453
 454                                 nid1 = route->lr_gateway->lp_nid;
 455                                 nid2 = route2->lr_gateway->lp_nid;
 456                                 net = rnet->lrn_net;
 457
 458                                 lnet_net_unlock(cpt);
 459
 460                                 CERROR("Routes to %s via %s and %s not supported\n",
 461                                        libcfs_net2str(net),
 462                                        libcfs_nid2str(nid1),
 463                                        libcfs_nid2str(nid2));
 464                                 return -EINVAL;
 465                         }
 466                 }
 467         }
 468
 469         lnet_net_unlock(cpt);
 470         return 0;
 471 }
 472
 473 int
 474 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
 475 {
 476         struct lnet_peer        *gateway;
 477         lnet_remotenet_t        *rnet;
 478         lnet_route_t            *route;
 479         struct list_head                *e1;
 480         struct list_head                *e2;
 481         int                     rc = -ENOENT;
 482         struct list_head                *rn_list;
 483         int                     idx = 0;
 484
 485         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 486                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 487
 488         /* NB Caller may specify either all routes via the given gateway
 489          * or a specific route entry actual NIDs) */
 490
 491         lnet_net_lock(LNET_LOCK_EX);
 492         if (net == LNET_NIDNET(LNET_NID_ANY))
 493                 rn_list = &the_lnet.ln_remote_nets_hash[0];
 494         else
 495                 rn_list = lnet_net2rnethash(net);
 496
 497  again:
 498         list_for_each(e1, rn_list) {
 499                 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 500
 501                 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
 502                         net == rnet->lrn_net))
 503                         continue;
 504
 505                 list_for_each(e2, &rnet->lrn_routes) {
 506                         route = list_entry(e2, lnet_route_t, lr_list);
 507
 508                         gateway = route->lr_gateway;
 509                         if (!(gw_nid == LNET_NID_ANY ||
 510                               gw_nid == gateway->lp_nid))
 511                                 continue;
 512
 513                         list_del(&route->lr_list);
 514                         list_del(&route->lr_gwlist);
 515                         the_lnet.ln_remote_nets_version++;
 516
 517                         if (list_empty(&rnet->lrn_routes))
 518                                 list_del(&rnet->lrn_list);
 519                         else
 520                                 rnet = NULL;
 521
 522                         lnet_rtr_decref_locked(gateway);
 523                         lnet_peer_decref_locked(gateway);
 524
 525                         lnet_net_unlock(LNET_LOCK_EX);
 526
 527                         LIBCFS_FREE(route, sizeof(*route));
 528
 529                         if (rnet != NULL)
 530                                 LIBCFS_FREE(rnet, sizeof(*rnet));
 531
 532                         rc = 0;
 533                         lnet_net_lock(LNET_LOCK_EX);
 534                         goto again;
 535                 }
 536         }
 537
 538         if (net == LNET_NIDNET(LNET_NID_ANY) &&
 539             ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
 540                 rn_list = &the_lnet.ln_remote_nets_hash[idx];
 541                 goto again;
 542         }
 543         lnet_net_unlock(LNET_LOCK_EX);
 544
 545         return rc;
 546 }
 547
 548 void
 549 lnet_destroy_routes (void)
 550 {
 551         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 552 }
 553
 554 int
 555 lnet_get_route(int idx, __u32 *net, __u32 *hops,
 556                lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
 557 {
 558         struct list_head                *e1;
 559         struct list_head                *e2;
 560         lnet_remotenet_t        *rnet;
 561         lnet_route_t            *route;
 562         int                     cpt;
 563         int                     i;
 564         struct list_head                *rn_list;
 565
 566         cpt = lnet_net_lock_current();
 567
 568         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 569                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 570                 list_for_each(e1, rn_list) {
 571                         rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 572
 573                         list_for_each(e2, &rnet->lrn_routes) {
 574                                 route = list_entry(e2, lnet_route_t,
 575                                                        lr_list);
 576
 577                                 if (idx-- == 0) {
 578                                         *net      = rnet->lrn_net;
 579                                         *hops     = route->lr_hops;
 580                                         *priority = route->lr_priority;
 581                                         *gateway  = route->lr_gateway->lp_nid;
 582                                         *alive    = route->lr_gateway->lp_alive;
 583                                         lnet_net_unlock(cpt);
 584                                         return 0;
 585                                 }
 586                         }
 587                 }
 588         }
 589
 590         lnet_net_unlock(cpt);
 591         return -ENOENT;
 592 }
 593
 594 void
 595 lnet_swap_pinginfo(lnet_ping_info_t *info)
 596 {
 597         int            i;
 598         lnet_ni_status_t *stat;
 599
 600         __swab32s(&info->pi_magic);
 601         __swab32s(&info->pi_features);
 602         __swab32s(&info->pi_pid);
 603         __swab32s(&info->pi_nnis);
 604         for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 605                 stat = &info->pi_ni[i];
 606                 __swab64s(&stat->ns_nid);
 607                 __swab32s(&stat->ns_status);
 608         }
 609         return;
 610 }
 611
 612 /**
 613  * parse router-checker pinginfo, record number of down NIs for remote
 614  * networks on that router.
 615  */
 616 static void
 617 lnet_parse_rc_info(lnet_rc_data_t *rcd)
 618 {
 619         lnet_ping_info_t        *info = rcd->rcd_pinginfo;
 620         struct lnet_peer        *gw   = rcd->rcd_gateway;
 621         lnet_route_t            *rtr;
 622
 623         if (!gw->lp_alive)
 624                 return;
 625
 626         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
 627                 lnet_swap_pinginfo(info);
 628
 629         /* NB always racing with network! */
 630         if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
 631                 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
 632                        libcfs_nid2str(gw->lp_nid), info->pi_magic);
 633                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 634                 return;
 635         }
 636
 637         gw->lp_ping_feats = info->pi_features;
 638         if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
 639                 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
 640                        libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
 641                 return; /* nothing I can understand */
 642         }
 643
 644         if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
 645                 return; /* can't carry NI status info */
 646
 647         list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
 648                 int     ptl_status = LNET_NI_STATUS_INVALID;
 649                 int     down = 0;
 650                 int     up = 0;
 651                 int     i;
 652
 653                 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 654                         lnet_ni_status_t *stat = &info->pi_ni[i];
 655                         lnet_nid_t       nid = stat->ns_nid;
 656
 657                         if (nid == LNET_NID_ANY) {
 658                                 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
 659                                        libcfs_nid2str(gw->lp_nid));
 660                                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 661                                 return;
 662                         }
 663
 664                         if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
 665                                 continue;
 666
 667                         if (stat->ns_status == LNET_NI_STATUS_DOWN) {
 668                                 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
 669                                         down++;
 670                                 else if (ptl_status != LNET_NI_STATUS_UP)
 671                                         ptl_status = LNET_NI_STATUS_DOWN;
 672                                 continue;
 673                         }
 674
 675                         if (stat->ns_status == LNET_NI_STATUS_UP) {
 676                                 if (LNET_NIDNET(nid) == rtr->lr_net) {
 677                                         up = 1;
 678                                         break;
 679                                 }
 680                                 /* ptl NIs are considered down only when
 681                                  * they're all down */
 682                                 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
 683                                         ptl_status = LNET_NI_STATUS_UP;
 684                                 continue;
 685                         }
 686
 687                         CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
 688                                libcfs_nid2str(gw->lp_nid), stat->ns_status);
 689                         gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 690                         return;
 691                 }
 692
 693                 if (up) { /* ignore downed NIs if NI for dest network is up */
 694                         rtr->lr_downis = 0;
 695                         continue;
 696                 }
 697                 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
 698         }
 699 }
 700
 701 static void
 702 lnet_router_checker_event(lnet_event_t *event)
 703 {
 704         lnet_rc_data_t          *rcd = event->md.user_ptr;
 705         struct lnet_peer        *lp;
 706
 707         LASSERT(rcd != NULL);
 708
 709         if (event->unlinked) {
 710                 LNetInvalidateHandle(&rcd->rcd_mdh);
 711                 return;
 712         }
 713
 714         LASSERT(event->type == LNET_EVENT_SEND ||
 715                 event->type == LNET_EVENT_REPLY);
 716
 717         lp = rcd->rcd_gateway;
 718         LASSERT(lp != NULL);
 719
 720          /* NB: it's called with holding lnet_res_lock, we have a few
 721           * places need to hold both locks at the same time, please take
 722           * care of lock ordering */
 723         lnet_net_lock(lp->lp_cpt);
 724         if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
 725                 /* ignore if no longer a router or rcd is replaced */
 726                 goto out;
 727         }
 728
 729         if (event->type == LNET_EVENT_SEND) {
 730                 lp->lp_ping_notsent = 0;
 731                 if (event->status == 0)
 732                         goto out;
 733         }
 734
 735         /* LNET_EVENT_REPLY */
 736         /* A successful REPLY means the router is up.  If _any_ comms
 737          * to the router fail I assume it's down (this will happen if
 738          * we ping alive routers to try to detect router death before
 739          * apps get burned). */
 740
 741         lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
 742         /* The router checker will wake up very shortly and do the
 743          * actual notification.
 744          * XXX If 'lp' stops being a router before then, it will still
 745          * have the notification pending!!! */
 746
 747         if (avoid_asym_router_failure && event->status == 0)
 748                 lnet_parse_rc_info(rcd);
 749
 750  out:
 751         lnet_net_unlock(lp->lp_cpt);
 752 }
 753
 754 void
 755 lnet_wait_known_routerstate(void)
 756 {
 757         lnet_peer_t      *rtr;
 758         struct list_head          *entry;
 759         int               all_known;
 760
 761         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
 762
 763         for (;;) {
 764                 int     cpt = lnet_net_lock_current();
 765
 766                 all_known = 1;
 767                 list_for_each (entry, &the_lnet.ln_routers) {
 768                         rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
 769
 770                         if (rtr->lp_alive_count == 0) {
 771                                 all_known = 0;
 772                                 break;
 773                         }
 774                 }
 775
 776                 lnet_net_unlock(cpt);
 777
 778                 if (all_known)
 779                         return;
 780
 781                 set_current_state(TASK_UNINTERRUPTIBLE);
 782                 schedule_timeout(cfs_time_seconds(1));
 783         }
 784 }
 785
 786 void
 787 lnet_update_ni_status_locked(void)
 788 {
 789         lnet_ni_t       *ni;
 790         long            now;
 791         int             timeout;
 792
 793         LASSERT(the_lnet.ln_routing);
 794
 795         timeout = router_ping_timeout +
 796                   MAX(live_router_check_interval, dead_router_check_interval);
 797
 798         now = get_seconds();
 799         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 800                 if (ni->ni_lnd->lnd_type == LOLND)
 801                         continue;
 802
 803                 if (now < ni->ni_last_alive + timeout)
 804                         continue;
 805
 806                 lnet_ni_lock(ni);
 807                 /* re-check with lock */
 808                 if (now < ni->ni_last_alive + timeout) {
 809                         lnet_ni_unlock(ni);
 810                         continue;
 811                 }
 812
 813                 LASSERT(ni->ni_status != NULL);
 814
 815                 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
 816                         CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
 817                                libcfs_nid2str(ni->ni_nid), timeout);
 818                         /* NB: so far, this is the only place to set
 819                          * NI status to "down" */
 820                         ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
 821                 }
 822                 lnet_ni_unlock(ni);
 823         }
 824 }
 825
 826 void
 827 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
 828 {
 829         LASSERT(list_empty(&rcd->rcd_list));
 830         /* detached from network */
 831         LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
 832
 833         if (rcd->rcd_gateway != NULL) {
 834                 int cpt = rcd->rcd_gateway->lp_cpt;
 835
 836                 lnet_net_lock(cpt);
 837                 lnet_peer_decref_locked(rcd->rcd_gateway);
 838                 lnet_net_unlock(cpt);
 839         }
 840
 841         if (rcd->rcd_pinginfo != NULL)
 842                 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
 843
 844         LIBCFS_FREE(rcd, sizeof(*rcd));
 845 }
 846
 847 lnet_rc_data_t *
 848 lnet_create_rc_data_locked(lnet_peer_t *gateway)
 849 {
 850         lnet_rc_data_t          *rcd = NULL;
 851         lnet_ping_info_t        *pi;
 852         int                     rc;
 853         int                     i;
 854
 855         lnet_net_unlock(gateway->lp_cpt);
 856
 857         LIBCFS_ALLOC(rcd, sizeof(*rcd));
 858         if (rcd == NULL)
 859                 goto out;
 860
 861         LNetInvalidateHandle(&rcd->rcd_mdh);
 862         INIT_LIST_HEAD(&rcd->rcd_list);
 863
 864         LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
 865         if (pi == NULL)
 866                 goto out;
 867
 868         for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
 869                 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
 870                 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
 871         }
 872         rcd->rcd_pinginfo = pi;
 873
 874         LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
 875         rc = LNetMDBind((lnet_md_t){.start     = pi,
 876                                     .user_ptr  = rcd,
 877                                     .length    = LNET_PINGINFO_SIZE,
 878                                     .threshold = LNET_MD_THRESH_INF,
 879                                     .options   = LNET_MD_TRUNCATE,
 880                                     .eq_handle = the_lnet.ln_rc_eqh},
 881                         LNET_UNLINK,
 882                         &rcd->rcd_mdh);
 883         if (rc < 0) {
 884                 CERROR("Can't bind MD: %d\n", rc);
 885                 goto out;
 886         }
 887         LASSERT(rc == 0);
 888
 889         lnet_net_lock(gateway->lp_cpt);
 890         /* router table changed or someone has created rcd for this gateway */
 891         if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
 892                 lnet_net_unlock(gateway->lp_cpt);
 893                 goto out;
 894         }
 895
 896         lnet_peer_addref_locked(gateway);
 897         rcd->rcd_gateway = gateway;
 898         gateway->lp_rcd = rcd;
 899         gateway->lp_ping_notsent = 0;
 900
 901         return rcd;
 902
 903  out:
 904         if (rcd != NULL) {
 905                 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
 906                         rc = LNetMDUnlink(rcd->rcd_mdh);
 907                         LASSERT(rc == 0);
 908                 }
 909                 lnet_destroy_rc_data(rcd);
 910         }
 911
 912         lnet_net_lock(gateway->lp_cpt);
 913         return gateway->lp_rcd;
 914 }
 915
 916 static int
 917 lnet_router_check_interval (lnet_peer_t *rtr)
 918 {
 919         int secs;
 920
 921         secs = rtr->lp_alive ? live_router_check_interval :
 922                                dead_router_check_interval;
 923         if (secs < 0)
 924                 secs = 0;
 925
 926         return secs;
 927 }
 928
 929 static void
 930 lnet_ping_router_locked (lnet_peer_t *rtr)
 931 {
 932         lnet_rc_data_t *rcd = NULL;
 933         unsigned long      now = cfs_time_current();
 934         int          secs;
 935
 936         lnet_peer_addref_locked(rtr);
 937
 938         if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
 939             cfs_time_after(now, rtr->lp_ping_deadline))
 940                 lnet_notify_locked(rtr, 1, 0, now);
 941
 942         /* Run any outstanding notifications */
 943         lnet_ni_notify_locked(rtr->lp_ni, rtr);
 944
 945         if (!lnet_isrouter(rtr) ||
 946             the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
 947                 /* router table changed or router checker is shutting down */
 948                 lnet_peer_decref_locked(rtr);
 949                 return;
 950         }
 951
 952         rcd = rtr->lp_rcd != NULL ?
 953               rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
 954
 955         if (rcd == NULL)
 956                 return;
 957
 958         secs = lnet_router_check_interval(rtr);
 959
 960         CDEBUG(D_NET,
 961                "rtr %s %d: deadline %lu ping_notsent %d alive %d alive_count %d lp_ping_timestamp %lu\n",
 962                libcfs_nid2str(rtr->lp_nid), secs,
 963                rtr->lp_ping_deadline, rtr->lp_ping_notsent,
 964                rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
 965
 966         if (secs != 0 && !rtr->lp_ping_notsent &&
 967             cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
 968                                              cfs_time_seconds(secs)))) {
 969                 int            rc;
 970                 lnet_process_id_t id;
 971                 lnet_handle_md_t  mdh;
 972
 973                 id.nid = rtr->lp_nid;
 974                 id.pid = LUSTRE_SRV_LNET_PID;
 975                 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
 976
 977                 rtr->lp_ping_notsent   = 1;
 978                 rtr->lp_ping_timestamp = now;
 979
 980                 mdh = rcd->rcd_mdh;
 981
 982                 if (rtr->lp_ping_deadline == 0) {
 983                         rtr->lp_ping_deadline =
 984                                 cfs_time_shift(router_ping_timeout);
 985                 }
 986
 987                 lnet_net_unlock(rtr->lp_cpt);
 988
 989                 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
 990                              LNET_PROTO_PING_MATCHBITS, 0);
 991
 992                 lnet_net_lock(rtr->lp_cpt);
 993                 if (rc != 0)
 994                         rtr->lp_ping_notsent = 0; /* no event pending */
 995         }
 996
 997         lnet_peer_decref_locked(rtr);
 998         return;
 999 }
1000
1001 int
1002 lnet_router_checker_start(void)
1003 {
1004         int       rc;
1005         int       eqsz;
1006
1007         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1008
1009         if (check_routers_before_use &&
1010             dead_router_check_interval <= 0) {
1011                 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be set if 'check_routers_before_use' is set\n");
1012                 return -EINVAL;
1013         }
1014
1015         if (!the_lnet.ln_routing &&
1016             live_router_check_interval <= 0 &&
1017             dead_router_check_interval <= 0)
1018                 return 0;
1019
1020         sema_init(&the_lnet.ln_rc_signal, 0);
1021         /* EQ size doesn't matter; the callback is guaranteed to get every
1022          * event */
1023         eqsz = 0;
1024         rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1025                          &the_lnet.ln_rc_eqh);
1026         if (rc != 0) {
1027                 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1028                 return -ENOMEM;
1029         }
1030
1031         the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1032         rc = PTR_ERR(kthread_run(lnet_router_checker,
1033                                  NULL, "router_checker"));
1034         if (IS_ERR_VALUE(rc)) {
1035                 CERROR("Can't start router checker thread: %d\n", rc);
1036                 /* block until event callback signals exit */
1037                 down(&the_lnet.ln_rc_signal);
1038                 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1039                 LASSERT(rc == 0);
1040                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1041                 return -ENOMEM;
1042         }
1043
1044         if (check_routers_before_use) {
1045                 /* Note that a helpful side-effect of pinging all known routers
1046                  * at startup is that it makes them drop stale connections they
1047                  * may have to a previous instance of me. */
1048                 lnet_wait_known_routerstate();
1049         }
1050
1051         return 0;
1052 }
1053
1054 void
1055 lnet_router_checker_stop (void)
1056 {
1057         int rc;
1058
1059         if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1060                 return;
1061
1062         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1063         the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1064
1065         /* block until event callback signals exit */
1066         down(&the_lnet.ln_rc_signal);
1067         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1068
1069         rc = LNetEQFree(the_lnet.ln_rc_eqh);
1070         LASSERT (rc == 0);
1071         return;
1072 }
1073
1074 static void
1075 lnet_prune_rc_data(int wait_unlink)
1076 {
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;
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");
1146                 set_current_state(TASK_UNINTERRUPTIBLE);
1147                 schedule_timeout(cfs_time_seconds(1) / 4);
1148
1149                 lnet_net_lock(LNET_LOCK_EX);
1150         }
1151
1152         lnet_net_unlock(LNET_LOCK_EX);
1153 }
1154
1155
1156 #if  defined(LNET_ROUTER)
1157
1158 static int
1159 lnet_router_checker(void *arg)
1160 {
1161         lnet_peer_t       *rtr;
1162         struct list_head        *entry;
1163
1164         cfs_block_allsigs();
1165
1166         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1167
1168         while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1169                 __u64   version;
1170                 int     cpt;
1171                 int     cpt2;
1172
1173                 cpt = lnet_net_lock_current();
1174 rescan:
1175                 version = the_lnet.ln_routers_version;
1176
1177                 list_for_each(entry, &the_lnet.ln_routers) {
1178                         rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1179
1180                         cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1181                         if (cpt != cpt2) {
1182                                 lnet_net_unlock(cpt);
1183                                 cpt = cpt2;
1184                                 lnet_net_lock(cpt);
1185                                 /* the routers list has changed */
1186                                 if (version != the_lnet.ln_routers_version)
1187                                         goto rescan;
1188                         }
1189
1190                         lnet_ping_router_locked(rtr);
1191
1192                         /* NB dropped lock */
1193                         if (version != the_lnet.ln_routers_version) {
1194                                 /* the routers list has changed */
1195                                 goto rescan;
1196                         }
1197                 }
1198
1199                 if (the_lnet.ln_routing)
1200                         lnet_update_ni_status_locked();
1201
1202                 lnet_net_unlock(cpt);
1203
1204                 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1205
1206                 /* Call schedule_timeout() here always adds 1 to load average
1207                  * because kernel counts # active tasks as nr_running
1208                  * + nr_uninterruptible. */
1209                 set_current_state(TASK_INTERRUPTIBLE);
1210                 schedule_timeout(cfs_time_seconds(1));
1211         }
1212
1213         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1214
1215         lnet_prune_rc_data(1); /* wait for UNLINK */
1216
1217         the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1218         up(&the_lnet.ln_rc_signal);
1219         /* The unlink event callback will signal final completion */
1220         return 0;
1221 }
1222
1223 void
1224 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1225 {
1226         int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1227
1228         while (--npages >= 0)
1229                 __free_page(rb->rb_kiov[npages].kiov_page);
1230
1231         LIBCFS_FREE(rb, sz);
1232 }
1233
1234 lnet_rtrbuf_t *
1235 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1236 {
1237         int         npages = rbp->rbp_npages;
1238         int         sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1239         struct page   *page;
1240         lnet_rtrbuf_t *rb;
1241         int         i;
1242
1243         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1244         if (rb == NULL)
1245                 return NULL;
1246
1247         rb->rb_pool = rbp;
1248
1249         for (i = 0; i < npages; i++) {
1250                 page = alloc_pages_node(
1251                                 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1252                                 __GFP_ZERO | GFP_IOFS, 0);
1253                 if (page == NULL) {
1254                         while (--i >= 0)
1255                                 __free_page(rb->rb_kiov[i].kiov_page);
1256
1257                         LIBCFS_FREE(rb, sz);
1258                         return NULL;
1259                 }
1260
1261                 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1262                 rb->rb_kiov[i].kiov_offset = 0;
1263                 rb->rb_kiov[i].kiov_page = page;
1264         }
1265
1266         return rb;
1267 }
1268
1269 void
1270 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
1271 {
1272         int             npages = rbp->rbp_npages;
1273         int             nbuffers = 0;
1274         lnet_rtrbuf_t   *rb;
1275
1276         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1277                 return;
1278
1279         LASSERT (list_empty(&rbp->rbp_msgs));
1280         LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers);
1281
1282         while (!list_empty(&rbp->rbp_bufs)) {
1283                 LASSERT (rbp->rbp_credits > 0);
1284
1285                 rb = list_entry(rbp->rbp_bufs.next,
1286                                     lnet_rtrbuf_t, rb_list);
1287                 list_del(&rb->rb_list);
1288                 lnet_destroy_rtrbuf(rb, npages);
1289                 nbuffers++;
1290         }
1291
1292         LASSERT (rbp->rbp_nbuffers == nbuffers);
1293         LASSERT (rbp->rbp_credits == nbuffers);
1294
1295         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1296 }
1297
1298 int
1299 lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1300 {
1301         lnet_rtrbuf_t *rb;
1302         int         i;
1303
1304         if (rbp->rbp_nbuffers != 0) {
1305                 LASSERT (rbp->rbp_nbuffers == nbufs);
1306                 return 0;
1307         }
1308
1309         for (i = 0; i < nbufs; i++) {
1310                 rb = lnet_new_rtrbuf(rbp, cpt);
1311
1312                 if (rb == NULL) {
1313                         CERROR("Failed to allocate %d router bufs of %d pages\n",
1314                                nbufs, rbp->rbp_npages);
1315                         return -ENOMEM;
1316                 }
1317
1318                 rbp->rbp_nbuffers++;
1319                 rbp->rbp_credits++;
1320                 rbp->rbp_mincredits++;
1321                 list_add(&rb->rb_list, &rbp->rbp_bufs);
1322
1323                 /* No allocation "under fire" */
1324                 /* Otherwise we'd need code to schedule blocked msgs etc */
1325                 LASSERT (!the_lnet.ln_routing);
1326         }
1327
1328         LASSERT (rbp->rbp_credits == nbufs);
1329         return 0;
1330 }
1331
1332 void
1333 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1334 {
1335         INIT_LIST_HEAD(&rbp->rbp_msgs);
1336         INIT_LIST_HEAD(&rbp->rbp_bufs);
1337
1338         rbp->rbp_npages = npages;
1339         rbp->rbp_credits = 0;
1340         rbp->rbp_mincredits = 0;
1341 }
1342
1343 void
1344 lnet_rtrpools_free(void)
1345 {
1346         lnet_rtrbufpool_t *rtrp;
1347         int               i;
1348
1349         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1350                 return;
1351
1352         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1353                 lnet_rtrpool_free_bufs(&rtrp[0]);
1354                 lnet_rtrpool_free_bufs(&rtrp[1]);
1355                 lnet_rtrpool_free_bufs(&rtrp[2]);
1356         }
1357
1358         cfs_percpt_free(the_lnet.ln_rtrpools);
1359         the_lnet.ln_rtrpools = NULL;
1360 }
1361
1362 static int
1363 lnet_nrb_tiny_calculate(int npages)
1364 {
1365         int     nrbs = LNET_NRB_TINY;
1366
1367         if (tiny_router_buffers < 0) {
1368                 LCONSOLE_ERROR_MSG(0x10c,
1369                                    "tiny_router_buffers=%d invalid when routing enabled\n",
1370                                    tiny_router_buffers);
1371                 return -1;
1372         }
1373
1374         if (tiny_router_buffers > 0)
1375                 nrbs = tiny_router_buffers;
1376
1377         nrbs /= LNET_CPT_NUMBER;
1378         return max(nrbs, LNET_NRB_TINY_MIN);
1379 }
1380
1381 static int
1382 lnet_nrb_small_calculate(int npages)
1383 {
1384         int     nrbs = LNET_NRB_SMALL;
1385
1386         if (small_router_buffers < 0) {
1387                 LCONSOLE_ERROR_MSG(0x10c,
1388                                    "small_router_buffers=%d invalid when routing enabled\n",
1389                                    small_router_buffers);
1390                 return -1;
1391         }
1392
1393         if (small_router_buffers > 0)
1394                 nrbs = small_router_buffers;
1395
1396         nrbs /= LNET_CPT_NUMBER;
1397         return max(nrbs, LNET_NRB_SMALL_MIN);
1398 }
1399
1400 static int
1401 lnet_nrb_large_calculate(int npages)
1402 {
1403         int     nrbs = LNET_NRB_LARGE;
1404
1405         if (large_router_buffers < 0) {
1406                 LCONSOLE_ERROR_MSG(0x10c,
1407                                    "large_router_buffers=%d invalid when routing enabled\n",
1408                                    large_router_buffers);
1409                 return -1;
1410         }
1411
1412         if (large_router_buffers > 0)
1413                 nrbs = large_router_buffers;
1414
1415         nrbs /= LNET_CPT_NUMBER;
1416         return max(nrbs, LNET_NRB_LARGE_MIN);
1417 }
1418
1419 int
1420 lnet_rtrpools_alloc(int im_a_router)
1421 {
1422         lnet_rtrbufpool_t *rtrp;
1423         int     large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1424         int     small_pages = 1;
1425         int     nrb_tiny;
1426         int     nrb_small;
1427         int     nrb_large;
1428         int     rc;
1429         int     i;
1430
1431         if (!strcmp(forwarding, "")) {
1432                 /* not set either way */
1433                 if (!im_a_router)
1434                         return 0;
1435         } else if (!strcmp(forwarding, "disabled")) {
1436                 /* explicitly disabled */
1437                 return 0;
1438         } else if (!strcmp(forwarding, "enabled")) {
1439                 /* explicitly enabled */
1440         } else {
1441                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either 'enabled' or 'disabled'\n");
1442                 return -EINVAL;
1443         }
1444
1445         nrb_tiny = lnet_nrb_tiny_calculate(0);
1446         if (nrb_tiny < 0)
1447                 return -EINVAL;
1448
1449         nrb_small = lnet_nrb_small_calculate(small_pages);
1450         if (nrb_small < 0)
1451                 return -EINVAL;
1452
1453         nrb_large = lnet_nrb_large_calculate(large_pages);
1454         if (nrb_large < 0)
1455                 return -EINVAL;
1456
1457         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1458                                                 LNET_NRBPOOLS *
1459                                                 sizeof(lnet_rtrbufpool_t));
1460         if (the_lnet.ln_rtrpools == NULL) {
1461                 LCONSOLE_ERROR_MSG(0x10c,
1462                                    "Failed to initialize router buffe pool\n");
1463                 return -ENOMEM;
1464         }
1465
1466         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1467                 lnet_rtrpool_init(&rtrp[0], 0);
1468                 rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i);
1469                 if (rc != 0)
1470                         goto failed;
1471
1472                 lnet_rtrpool_init(&rtrp[1], small_pages);
1473                 rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i);
1474                 if (rc != 0)
1475                         goto failed;
1476
1477                 lnet_rtrpool_init(&rtrp[2], large_pages);
1478                 rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i);
1479                 if (rc != 0)
1480                         goto failed;
1481         }
1482
1483         lnet_net_lock(LNET_LOCK_EX);
1484         the_lnet.ln_routing = 1;
1485         lnet_net_unlock(LNET_LOCK_EX);
1486
1487         return 0;
1488
1489  failed:
1490         lnet_rtrpools_free();
1491         return rc;
1492 }
1493
1494 int
1495 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1496 {
1497         struct lnet_peer        *lp = NULL;
1498         unsigned long           now = cfs_time_current();
1499         int                     cpt = lnet_cpt_of_nid(nid);
1500
1501         LASSERT (!in_interrupt ());
1502
1503         CDEBUG (D_NET, "%s notifying %s: %s\n",
1504                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1505                 libcfs_nid2str(nid),
1506                 alive ? "up" : "down");
1507
1508         if (ni != NULL &&
1509             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1510                 CWARN ("Ignoring notification of %s %s by %s (different net)\n",
1511                         libcfs_nid2str(nid), alive ? "birth" : "death",
1512                         libcfs_nid2str(ni->ni_nid));
1513                 return -EINVAL;
1514         }
1515
1516         /* can't do predictions... */
1517         if (cfs_time_after(when, now)) {
1518                 CWARN("Ignoring prediction from %s of %s %s %ld seconds in the future\n",
1519                       (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1520                       libcfs_nid2str(nid), alive ? "up" : "down",
1521                       cfs_duration_sec(cfs_time_sub(when, now)));
1522                 return -EINVAL;
1523         }
1524
1525         if (ni != NULL && !alive &&          /* LND telling me she's down */
1526             !auto_down) {                      /* auto-down disabled */
1527                 CDEBUG(D_NET, "Auto-down disabled\n");
1528                 return 0;
1529         }
1530
1531         lnet_net_lock(cpt);
1532
1533         if (the_lnet.ln_shutdown) {
1534                 lnet_net_unlock(cpt);
1535                 return -ESHUTDOWN;
1536         }
1537
1538         lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1539         if (lp == NULL) {
1540                 /* nid not found */
1541                 lnet_net_unlock(cpt);
1542                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1543                 return 0;
1544         }
1545
1546         /* We can't fully trust LND on reporting exact peer last_alive
1547          * if he notifies us about dead peer. For example ksocklnd can
1548          * call us with when == _time_when_the_node_was_booted_ if
1549          * no connections were successfully established */
1550         if (ni != NULL && !alive && when < lp->lp_last_alive)
1551                 when = lp->lp_last_alive;
1552
1553         lnet_notify_locked(lp, ni == NULL, alive, when);
1554
1555         lnet_ni_notify_locked(ni, lp);
1556
1557         lnet_peer_decref_locked(lp);
1558
1559         lnet_net_unlock(cpt);
1560         return 0;
1561 }
1562 EXPORT_SYMBOL(lnet_notify);
1563
1564 void
1565 lnet_get_tunables (void)
1566 {
1567         return;
1568 }
1569
1570 #else
1571
1572 int
1573 lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1574 {
1575         return -EOPNOTSUPP;
1576 }
1577
1578 void
1579 lnet_router_checker (void)
1580 {
1581         static time_t last = 0;
1582         static int    running = 0;
1583
1584         time_t      now = get_seconds();
1585         int            interval = now - last;
1586         int            rc;
1587         __u64        version;
1588         lnet_peer_t      *rtr;
1589
1590         /* It's no use to call me again within a sec - all intervals and
1591          * timeouts are measured in seconds */
1592         if (last != 0 && interval < 2)
1593                 return;
1594
1595         if (last != 0 &&
1596             interval > MAX(live_router_check_interval,
1597                            dead_router_check_interval))
1598                 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1599                         live_router_check_interval, dead_router_check_interval,
1600                         interval);
1601
1602         LASSERT(LNET_CPT_NUMBER == 1);
1603
1604         lnet_net_lock(0);
1605         LASSERT(!running); /* recursion check */
1606         running = 1;
1607         lnet_net_unlock(0);
1608
1609         last = now;
1610
1611         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1612                 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1613
1614         /* consume all pending events */
1615         while (1) {
1616                 int       i;
1617                 lnet_event_t ev;
1618
1619                 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1620                  * recursion breaker in LNetEQPoll would fail */
1621                 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1622                 if (rc == 0)   /* no event pending */
1623                         break;
1624
1625                 /* NB a lost SENT prevents me from pinging a router again */
1626                 if (rc == -EOVERFLOW) {
1627                         CERROR("Dropped an event!!!\n");
1628                         abort();
1629                 }
1630
1631                 LASSERT (rc == 1);
1632
1633                 lnet_router_checker_event(&ev);
1634         }
1635
1636         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1637                 lnet_prune_rc_data(1); /* release rcd */
1638                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1639                 running = 0;
1640                 return;
1641         }
1642
1643         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1644
1645         lnet_net_lock(0);
1646
1647         version = the_lnet.ln_routers_version;
1648         list_for_each_entry (rtr, &the_lnet.ln_routers, lp_rtr_list) {
1649                 lnet_ping_router_locked(rtr);
1650                 LASSERT (version == the_lnet.ln_routers_version);
1651         }
1652
1653         lnet_net_unlock(0);
1654
1655         running = 0; /* lock only needed for the recursion check */
1656         return;
1657 }
1658
1659 /* NB lnet_peers_start_down depends on me,
1660  * so must be called before any peer creation */
1661 void
1662 lnet_get_tunables (void)
1663 {
1664         char *s;
1665
1666         s = getenv("LNET_ROUTER_PING_TIMEOUT");
1667         if (s != NULL) router_ping_timeout = atoi(s);
1668
1669         s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1670         if (s != NULL) live_router_check_interval = atoi(s);
1671
1672         s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1673         if (s != NULL) dead_router_check_interval = atoi(s);
1674
1675         /* This replaces old lnd_notify mechanism */
1676         check_routers_before_use = 1;
1677         if (dead_router_check_interval <= 0)
1678                 dead_router_check_interval = 30;
1679 }
1680
1681 void
1682 lnet_rtrpools_free(void)
1683 {
1684 }
1685
1686 int
1687 lnet_rtrpools_alloc(int im_a_arouter)
1688 {
1689         return 0;
1690 }
1691
1692 #endif