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 static char *forwarding = "";
  30 CFS_MODULE_PARM(forwarding, "s", charp, 0444,
  31                 "Explicitly enable/disable forwarding between networks");
  32
  33 static int tiny_router_buffers = 1024;
  34 CFS_MODULE_PARM(tiny_router_buffers, "i", int, 0444,
  35                 "# of 0 payload messages to buffer in the router");
  36 static int small_router_buffers = 8192;
  37 CFS_MODULE_PARM(small_router_buffers, "i", int, 0444,
  38                 "# of small (1 page) messages to buffer in the router");
  39 static int large_router_buffers = 512;
  40 CFS_MODULE_PARM(large_router_buffers, "i", int, 0444,
  41                 "# of large messages to buffer in the router");
  42 static int peer_buffer_credits = 0;
  43 CFS_MODULE_PARM(peer_buffer_credits, "i", int, 0444,
  44                 "# router buffer credits per peer");
  45
  46 static int auto_down = 1;
  47 CFS_MODULE_PARM(auto_down, "i", int, 0444,
  48                 "Automatically mark peers down on comms error");
  49
  50 int
  51 lnet_peer_buffer_credits(lnet_ni_t *ni)
  52 {
  53         /* NI option overrides LNet default */
  54         if (ni->ni_peerrtrcredits > 0)
  55                 return ni->ni_peerrtrcredits;
  56         if (peer_buffer_credits > 0)
  57                 return peer_buffer_credits;
  58
  59         /* As an approximation, allow this peer the same number of router
  60          * buffers as it is allowed outstanding sends */
  61         return ni->ni_peertxcredits;
  62 }
  63
  64 /* forward ref's */
  65 static int lnet_router_checker(void *);
  66 #else
  67
  68 int
  69 lnet_peer_buffer_credits(lnet_ni_t *ni)
  70 {
  71         return 0;
  72 }
  73
  74 #endif
  75
  76 static int check_routers_before_use = 0;
  77 CFS_MODULE_PARM(check_routers_before_use, "i", int, 0444,
  78                 "Assume routers are down and ping them before use");
  79
  80 static int avoid_asym_router_failure = 0;
  81 CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0444,
  82                 "Avoid asymmetrical failures: reserved, use at your own risk");
  83
  84 static int dead_router_check_interval = 0;
  85 CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0444,
  86                 "Seconds between dead router health checks (<= 0 to disable)");
  87
  88 static int live_router_check_interval = 0;
  89 CFS_MODULE_PARM(live_router_check_interval, "i", int, 0444,
  90                 "Seconds between live router health checks (<= 0 to disable)");
  91
  92 static int router_ping_timeout = 50;
  93 CFS_MODULE_PARM(router_ping_timeout, "i", int, 0444,
  94                 "Seconds to wait for the reply to a router health query");
  95
  96 int
  97 lnet_peers_start_down(void)
  98 {
  99         return check_routers_before_use;
 100 }
 101
 102 void
 103 lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when)
 104 {
 105         if (cfs_time_before(when, lp->lp_timestamp)) { /* out of date information */
 106                 CDEBUG(D_NET, "Out of date\n");
 107                 return;
 108         }
 109
 110         lp->lp_timestamp = when;                /* update timestamp */
 111         lp->lp_ping_deadline = 0;               /* disable ping timeout */
 112
 113         if (lp->lp_alive_count != 0 &&          /* got old news */
 114             (!lp->lp_alive) == (!alive)) {      /* new date for old news */
 115                 CDEBUG(D_NET, "Old news\n");
 116                 return;
 117         }
 118
 119         /* Flag that notification is outstanding */
 120
 121         lp->lp_alive_count++;
 122         lp->lp_alive = !(!alive);               /* 1 bit! */
 123         lp->lp_notify = 1;
 124         lp->lp_notifylnd |= notifylnd;
 125         if (lp->lp_alive)
 126                 lp->lp_ping_version = LNET_PROTO_PING_UNKNOWN; /* reset */
 127
 128         CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
 129 }
 130
 131 void
 132 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
 133 {
 134         int        alive;
 135         int        notifylnd;
 136
 137         /* Notify only in 1 thread at any time to ensure ordered notification.
 138          * NB individual events can be missed; the only guarantee is that you
 139          * always get the most recent news */
 140
 141         if (lp->lp_notifying)
 142                 return;
 143
 144         lp->lp_notifying = 1;
 145
 146         while (lp->lp_notify) {
 147                 alive     = lp->lp_alive;
 148                 notifylnd = lp->lp_notifylnd;
 149
 150                 lp->lp_notifylnd = 0;
 151                 lp->lp_notify    = 0;
 152
 153                 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
 154                         LNET_UNLOCK();
 155
 156                         /* A new notification could happen now; I'll handle it
 157                          * when control returns to me */
 158
 159                         (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
 160
 161                         LNET_LOCK();
 162                 }
 163         }
 164
 165         lp->lp_notifying = 0;
 166 }
 167
 168
 169 static void
 170 lnet_rtr_addref_locked(lnet_peer_t *lp)
 171 {
 172         LASSERT (lp->lp_refcount > 0);
 173         LASSERT (lp->lp_rtr_refcount >= 0);
 174
 175         lp->lp_rtr_refcount++;
 176         if (lp->lp_rtr_refcount == 1) {
 177                 cfs_list_t *pos;
 178
 179                 /* a simple insertion sort */
 180                 cfs_list_for_each_prev(pos, &the_lnet.ln_routers) {
 181                         lnet_peer_t *rtr = cfs_list_entry(pos, lnet_peer_t,
 182                                                           lp_rtr_list);
 183
 184                         if (rtr->lp_nid < lp->lp_nid)
 185                                 break;
 186                 }
 187
 188                 cfs_list_add(&lp->lp_rtr_list, pos);
 189                 /* addref for the_lnet.ln_routers */
 190                 lnet_peer_addref_locked(lp);
 191                 the_lnet.ln_routers_version++;
 192         }
 193 }
 194
 195 static void
 196 lnet_rtr_decref_locked(lnet_peer_t *lp)
 197 {
 198         LASSERT (lp->lp_refcount > 0);
 199         LASSERT (lp->lp_rtr_refcount > 0);
 200
 201         lp->lp_rtr_refcount--;
 202         if (lp->lp_rtr_refcount == 0) {
 203                 LASSERT(cfs_list_empty(&lp->lp_routes));
 204
 205                 if (lp->lp_rcd != NULL) {
 206                         cfs_list_add(&lp->lp_rcd->rcd_list,
 207                                      &the_lnet.ln_rcd_deathrow);
 208                         lp->lp_rcd = NULL;
 209                 }
 210
 211                 cfs_list_del(&lp->lp_rtr_list);
 212                 /* decref for the_lnet.ln_routers */
 213                 lnet_peer_decref_locked(lp);
 214                 the_lnet.ln_routers_version++;
 215         }
 216 }
 217
 218 lnet_remotenet_t *
 219 lnet_find_net_locked (__u32 net)
 220 {
 221         lnet_remotenet_t *rnet;
 222         cfs_list_t       *tmp;
 223
 224         LASSERT (!the_lnet.ln_shutdown);
 225
 226         cfs_list_for_each (tmp, &the_lnet.ln_remote_nets) {
 227                 rnet = cfs_list_entry(tmp, lnet_remotenet_t, lrn_list);
 228
 229                 if (rnet->lrn_net == net)
 230                         return rnet;
 231         }
 232         return NULL;
 233 }
 234
 235 static void lnet_shuffle_seed(void)
 236 {
 237         static int seeded = 0;
 238         int lnd_type, seed[2];
 239         struct timeval tv;
 240         lnet_ni_t *ni;
 241         cfs_list_t *tmp;
 242
 243         if (seeded)
 244                 return;
 245
 246         cfs_get_random_bytes(seed, sizeof(seed));
 247
 248         /* Nodes with small feet have little entropy
 249          * the NID for this node gives the most entropy in the low bits */
 250         cfs_list_for_each(tmp, &the_lnet.ln_nis) {
 251                 ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
 252                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
 253
 254                 if (lnd_type != LOLND)
 255                         seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
 256         }
 257
 258         cfs_gettimeofday(&tv);
 259         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 260         seeded = 1;
 261         return;
 262 }
 263
 264 /* NB expects LNET_LOCK held */
 265 void
 266 lnet_add_route_to_rnet (lnet_remotenet_t *rnet, lnet_route_t *route)
 267 {
 268         unsigned int      len = 0;
 269         unsigned int      offset = 0;
 270         cfs_list_t       *e;
 271
 272         lnet_shuffle_seed();
 273
 274         cfs_list_for_each (e, &rnet->lrn_routes) {
 275                 len++;
 276         }
 277
 278         /* len+1 positions to add a new entry, also prevents division by 0 */
 279         offset = cfs_rand() % (len + 1);
 280         cfs_list_for_each (e, &rnet->lrn_routes) {
 281                 if (offset == 0)
 282                         break;
 283                 offset--;
 284         }
 285         cfs_list_add(&route->lr_list, e);
 286         cfs_list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
 287
 288         the_lnet.ln_remote_nets_version++;
 289         lnet_rtr_addref_locked(route->lr_gateway);
 290 }
 291
 292 int
 293 lnet_add_route (__u32 net, unsigned int hops, lnet_nid_t gateway)
 294 {
 295         cfs_list_t          *e;
 296         lnet_remotenet_t    *rnet;
 297         lnet_remotenet_t    *rnet2;
 298         lnet_route_t        *route;
 299         lnet_ni_t           *ni;
 300         int                  add_route;
 301         int                  rc;
 302
 303         CDEBUG(D_NET, "Add route: net %s hops %u gw %s\n",
 304                libcfs_net2str(net), hops, libcfs_nid2str(gateway));
 305
 306         if (gateway == LNET_NID_ANY ||
 307             LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
 308             net == LNET_NIDNET(LNET_NID_ANY) ||
 309             LNET_NETTYP(net) == LOLND ||
 310             LNET_NIDNET(gateway) == net ||
 311             hops < 1 || hops > 255)
 312                 return (-EINVAL);
 313
 314         if (lnet_islocalnet(net))               /* it's a local network */
 315                 return 0;                       /* ignore the route entry */
 316
 317         /* Assume net, route, all new */
 318         LIBCFS_ALLOC(route, sizeof(*route));
 319         LIBCFS_ALLOC(rnet, sizeof(*rnet));
 320         if (route == NULL || rnet == NULL) {
 321                 CERROR("Out of memory creating route %s %d %s\n",
 322                        libcfs_net2str(net), hops, libcfs_nid2str(gateway));
 323                 if (route != NULL)
 324                         LIBCFS_FREE(route, sizeof(*route));
 325                 if (rnet != NULL)
 326                         LIBCFS_FREE(rnet, sizeof(*rnet));
 327                 return -ENOMEM;
 328         }
 329
 330         CFS_INIT_LIST_HEAD(&rnet->lrn_routes);
 331         rnet->lrn_net = net;
 332         route->lr_hops = hops;
 333         route->lr_net = net;
 334
 335         LNET_LOCK();
 336
 337         rc = lnet_nid2peer_locked(&route->lr_gateway, gateway);
 338         if (rc != 0) {
 339                 LNET_UNLOCK();
 340
 341                 LIBCFS_FREE(route, sizeof(*route));
 342                 LIBCFS_FREE(rnet, sizeof(*rnet));
 343
 344                 if (rc == -EHOSTUNREACH) { /* gateway is not on a local net */
 345                         return 0;               /* ignore the route entry */
 346                 } else {
 347                         CERROR("Error %d creating route %s %d %s\n", rc,
 348                                libcfs_net2str(net), hops,
 349                                libcfs_nid2str(gateway));
 350                 }
 351                 return rc;
 352         }
 353
 354         LASSERT (!the_lnet.ln_shutdown);
 355
 356         rnet2 = lnet_find_net_locked(net);
 357         if (rnet2 == NULL) {
 358                 /* new network */
 359                 cfs_list_add_tail(&rnet->lrn_list, &the_lnet.ln_remote_nets);
 360                 rnet2 = rnet;
 361         }
 362
 363         /* Search for a duplicate route (it's a NOOP if it is) */
 364         add_route = 1;
 365         cfs_list_for_each (e, &rnet2->lrn_routes) {
 366                 lnet_route_t *route2 = cfs_list_entry(e, lnet_route_t, lr_list);
 367
 368                 if (route2->lr_gateway == route->lr_gateway) {
 369                         add_route = 0;
 370                         break;
 371                 }
 372
 373                 /* our lookups must be true */
 374                 LASSERT (route2->lr_gateway->lp_nid != gateway);
 375         }
 376
 377         if (add_route) {
 378                 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
 379                 lnet_add_route_to_rnet(rnet2, route);
 380
 381                 ni = route->lr_gateway->lp_ni;
 382                 LNET_UNLOCK();
 383
 384                 /* XXX Assume alive */
 385                 if (ni->ni_lnd->lnd_notify != NULL)
 386                         (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
 387
 388                 LNET_LOCK();
 389         }
 390
 391         /* -1 for notify or !add_route */
 392         lnet_peer_decref_locked(route->lr_gateway);
 393         LNET_UNLOCK();
 394
 395         if (!add_route)
 396                 LIBCFS_FREE(route, sizeof(*route));
 397
 398         if (rnet != rnet2)
 399                 LIBCFS_FREE(rnet, sizeof(*rnet));
 400
 401         return 0;
 402 }
 403
 404 int
 405 lnet_check_routes (void)
 406 {
 407         lnet_remotenet_t    *rnet;
 408         lnet_route_t        *route;
 409         lnet_route_t        *route2;
 410         cfs_list_t          *e1;
 411         cfs_list_t          *e2;
 412
 413         LNET_LOCK();
 414
 415         cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
 416                 rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
 417
 418                 route2 = NULL;
 419                 cfs_list_for_each (e2, &rnet->lrn_routes) {
 420                         lnet_nid_t      nid1;
 421                         lnet_nid_t      nid2;
 422                         int             net;
 423
 424                         route = cfs_list_entry(e2, lnet_route_t, lr_list);
 425
 426                         if (route2 == NULL) {
 427                                 route2 = route;
 428                                 continue;
 429                         }
 430
 431                         if (route->lr_gateway->lp_ni ==
 432                             route2->lr_gateway->lp_ni)
 433                                 continue;
 434
 435                         nid1 = route->lr_gateway->lp_nid;
 436                         nid2 = route2->lr_gateway->lp_nid;
 437                         net = rnet->lrn_net;
 438
 439                         LNET_UNLOCK();
 440
 441                         CERROR("Routes to %s via %s and %s not supported\n",
 442                                libcfs_net2str(net), libcfs_nid2str(nid1),
 443                                libcfs_nid2str(nid2));
 444                         return -EINVAL;
 445                 }
 446         }
 447
 448         LNET_UNLOCK();
 449         return 0;
 450 }
 451
 452 int
 453 lnet_del_route (__u32 net, lnet_nid_t gw_nid)
 454 {
 455         struct lnet_peer        *gateway;
 456         lnet_remotenet_t    *rnet;
 457         lnet_route_t        *route;
 458         cfs_list_t          *e1;
 459         cfs_list_t          *e2;
 460         int                  rc = -ENOENT;
 461
 462         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 463                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 464
 465         /* NB Caller may specify either all routes via the given gateway
 466          * or a specific route entry actual NIDs) */
 467
 468  again:
 469         LNET_LOCK();
 470
 471         cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
 472                 rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
 473
 474                 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
 475                       net == rnet->lrn_net))
 476                         continue;
 477
 478                 cfs_list_for_each (e2, &rnet->lrn_routes) {
 479                         route = cfs_list_entry(e2, lnet_route_t, lr_list);
 480
 481                         gateway = route->lr_gateway;
 482                         if (!(gw_nid == LNET_NID_ANY ||
 483                               gw_nid == gateway->lp_nid))
 484                                 continue;
 485
 486                         cfs_list_del(&route->lr_list);
 487                         cfs_list_del(&route->lr_gwlist);
 488                         the_lnet.ln_remote_nets_version++;
 489
 490                         if (cfs_list_empty(&rnet->lrn_routes))
 491                                 cfs_list_del(&rnet->lrn_list);
 492                         else
 493                                 rnet = NULL;
 494
 495                         lnet_rtr_decref_locked(gateway);
 496                         lnet_peer_decref_locked(gateway);
 497                         LNET_UNLOCK();
 498
 499                         LIBCFS_FREE(route, sizeof (*route));
 500
 501                         if (rnet != NULL)
 502                                 LIBCFS_FREE(rnet, sizeof(*rnet));
 503
 504                         rc = 0;
 505                         goto again;
 506                 }
 507         }
 508
 509         LNET_UNLOCK();
 510         return rc;
 511 }
 512
 513 void
 514 lnet_destroy_routes (void)
 515 {
 516         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 517 }
 518
 519 int
 520 lnet_get_route (int idx, __u32 *net, __u32 *hops,
 521                lnet_nid_t *gateway, __u32 *alive)
 522 {
 523         cfs_list_t          *e1;
 524         cfs_list_t          *e2;
 525         lnet_remotenet_t    *rnet;
 526         lnet_route_t        *route;
 527
 528         LNET_LOCK();
 529
 530         cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
 531                 rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
 532
 533                 cfs_list_for_each (e2, &rnet->lrn_routes) {
 534                         route = cfs_list_entry(e2, lnet_route_t, lr_list);
 535
 536                         if (idx-- == 0) {
 537                                 *net     = rnet->lrn_net;
 538                                 *hops    = route->lr_hops;
 539                                 *gateway = route->lr_gateway->lp_nid;
 540                                 *alive   = route->lr_gateway->lp_alive;
 541                                 LNET_UNLOCK();
 542                                 return 0;
 543                         }
 544                 }
 545         }
 546
 547         LNET_UNLOCK();
 548         return -ENOENT;
 549 }
 550
 551 void
 552 lnet_swap_pinginfo(lnet_ping_info_t *info)
 553 {
 554         int               i;
 555         lnet_ni_status_t *stat;
 556
 557         __swab32s(&info->pi_magic);
 558         __swab32s(&info->pi_version);
 559         __swab32s(&info->pi_pid);
 560         __swab32s(&info->pi_nnis);
 561         for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 562                 stat = &info->pi_ni[i];
 563                 __swab64s(&stat->ns_nid);
 564                 __swab32s(&stat->ns_status);
 565         }
 566         return;
 567 }
 568
 569 /**
 570  * parse router-checker pinginfo, record number of down NIs for remote
 571  * networks on that router.
 572  */
 573 static void
 574 lnet_parse_rc_info(lnet_rc_data_t *rcd)
 575 {
 576         lnet_ping_info_t        *info = rcd->rcd_pinginfo;
 577         struct lnet_peer        *gw   = rcd->rcd_gateway;
 578         lnet_route_t            *rtr;
 579
 580         if (!gw->lp_alive)
 581                 return;
 582
 583         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
 584                 lnet_swap_pinginfo(info);
 585
 586         /* NB always racing with network! */
 587         if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
 588                 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
 589                        libcfs_nid2str(gw->lp_nid), info->pi_magic);
 590                 gw->lp_ping_version = LNET_PROTO_PING_UNKNOWN;
 591                 return;
 592         }
 593
 594         gw->lp_ping_version = info->pi_version;
 595         if (gw->lp_ping_version == LNET_PROTO_PING_VERSION_1)
 596                 return; /* v1 doesn't carry NI status info */
 597
 598         if (gw->lp_ping_version != LNET_PROTO_PING_VERSION) {
 599                 CDEBUG(D_NET, "%s: Unexpected version 0x%x\n",
 600                        libcfs_nid2str(gw->lp_nid), gw->lp_ping_version);
 601                 gw->lp_ping_version = LNET_PROTO_PING_UNKNOWN;
 602                 return;
 603         }
 604
 605         cfs_list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
 606                 int     ptl_status = LNET_NI_STATUS_INVALID;
 607                 int     down = 0;
 608                 int     up = 0;
 609                 int     i;
 610
 611                 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 612                         lnet_ni_status_t *stat = &info->pi_ni[i];
 613                         lnet_nid_t       nid = stat->ns_nid;
 614
 615                         if (nid == LNET_NID_ANY) {
 616                                 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
 617                                        libcfs_nid2str(gw->lp_nid));
 618                                 gw->lp_ping_version = LNET_PROTO_PING_UNKNOWN;
 619                                 return;
 620                         }
 621
 622                         if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
 623                                 continue;
 624
 625                         if (stat->ns_status == LNET_NI_STATUS_DOWN) {
 626                                 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
 627                                         down++;
 628                                 else if (ptl_status != LNET_NI_STATUS_UP)
 629                                         ptl_status = LNET_NI_STATUS_DOWN;
 630                                 continue;
 631                         }
 632
 633                         if (stat->ns_status == LNET_NI_STATUS_UP) {
 634                                 if (LNET_NIDNET(nid) == rtr->lr_net) {
 635                                         up = 1;
 636                                         break;
 637                                 }
 638                                 /* ptl NIs are considered down only when
 639                                  * they're all down */
 640                                 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
 641                                         ptl_status = LNET_NI_STATUS_UP;
 642                                 continue;
 643                         }
 644
 645                         CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
 646                                libcfs_nid2str(gw->lp_nid), stat->ns_status);
 647                         gw->lp_ping_version = LNET_PROTO_PING_UNKNOWN;
 648                         return;
 649                 }
 650
 651                 if (up) { /* ignore downed NIs if NI for dest network is up */
 652                         rtr->lr_downis = 0;
 653                         continue;
 654                 }
 655                 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
 656         }
 657 }
 658
 659 static void
 660 lnet_router_checker_event(lnet_event_t *event)
 661 {
 662         lnet_rc_data_t          *rcd = event->md.user_ptr;
 663         struct lnet_peer        *lp;
 664
 665         LASSERT(rcd != NULL);
 666
 667         if (event->unlinked) {
 668                 LNetInvalidateHandle(&rcd->rcd_mdh);
 669                 return;
 670         }
 671
 672         LASSERT(event->type == LNET_EVENT_SEND ||
 673                 event->type == LNET_EVENT_REPLY);
 674
 675         lp = rcd->rcd_gateway;
 676         LASSERT(lp != NULL);
 677
 678         LNET_LOCK();
 679         if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
 680                 /* ignore if no longer a router or rcd is replaced */
 681                 goto out;
 682         }
 683
 684         if (event->type == LNET_EVENT_SEND) {
 685                 lp->lp_ping_notsent = 0;
 686                 if (event->status == 0)
 687                         goto out;
 688         }
 689
 690         /* LNET_EVENT_REPLY */
 691         /* A successful REPLY means the router is up.  If _any_ comms
 692          * to the router fail I assume it's down (this will happen if
 693          * we ping alive routers to try to detect router death before
 694          * apps get burned). */
 695
 696         lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
 697         /* The router checker will wake up very shortly and do the
 698          * actual notification.
 699          * XXX If 'lp' stops being a router before then, it will still
 700          * have the notification pending!!! */
 701
 702         if (avoid_asym_router_failure && event->status == 0)
 703                 lnet_parse_rc_info(rcd);
 704
 705  out:
 706         LNET_UNLOCK();
 707 }
 708
 709 void
 710 lnet_wait_known_routerstate(void)
 711 {
 712         lnet_peer_t         *rtr;
 713         cfs_list_t          *entry;
 714         int                  all_known;
 715
 716         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
 717
 718         for (;;) {
 719                 LNET_LOCK();
 720
 721                 all_known = 1;
 722                 cfs_list_for_each (entry, &the_lnet.ln_routers) {
 723                         rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list);
 724
 725                         if (rtr->lp_alive_count == 0) {
 726                                 all_known = 0;
 727                                 break;
 728                         }
 729                 }
 730
 731                 LNET_UNLOCK();
 732
 733                 if (all_known)
 734                         return;
 735
 736 #ifndef __KERNEL__
 737                 lnet_router_checker();
 738 #endif
 739                 cfs_pause(cfs_time_seconds(1));
 740         }
 741 }
 742
 743 void
 744 lnet_update_ni_status_locked(void)
 745 {
 746         lnet_ni_t       *ni;
 747         long            now;
 748         int             timeout;
 749
 750         LASSERT(the_lnet.ln_routing);
 751
 752         timeout = router_ping_timeout +
 753                   MAX(live_router_check_interval, dead_router_check_interval);
 754
 755         now = cfs_time_current_sec();
 756         cfs_list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 757                 if (ni->ni_lnd->lnd_type == LOLND)
 758                         continue;
 759
 760                 if (now < ni->ni_last_alive + timeout)
 761                         continue;
 762
 763                 LASSERT(ni->ni_status != NULL);
 764
 765                 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
 766                         CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
 767                                libcfs_nid2str(ni->ni_nid), timeout);
 768                         /* NB: so far, this is the only place to set
 769                          * NI status to "down" */
 770                         ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
 771                 }
 772         }
 773 }
 774
 775 void
 776 lnet_destroy_rc_data (lnet_rc_data_t *rcd)
 777 {
 778         LASSERT(cfs_list_empty(&rcd->rcd_list));
 779         /* detached from network */
 780         LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
 781
 782         if (rcd->rcd_gateway != NULL) {
 783                 LNET_LOCK();
 784                 lnet_peer_decref_locked(rcd->rcd_gateway);
 785                 LNET_UNLOCK();
 786         }
 787
 788         if (rcd->rcd_pinginfo != NULL)
 789                 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
 790
 791         LIBCFS_FREE(rcd, sizeof(*rcd));
 792 }
 793
 794 lnet_rc_data_t *
 795 lnet_create_rc_data_locked(lnet_peer_t *gateway)
 796 {
 797         lnet_rc_data_t          *rcd = NULL;
 798         lnet_ping_info_t        *pi;
 799         int                     rc;
 800         int                     i;
 801
 802         LNET_UNLOCK();
 803
 804         LIBCFS_ALLOC(rcd, sizeof(*rcd));
 805         if (rcd == NULL)
 806                 goto out;
 807
 808         LNetInvalidateHandle(&rcd->rcd_mdh);
 809         CFS_INIT_LIST_HEAD(&rcd->rcd_list);
 810
 811         LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
 812         if (pi == NULL)
 813                 goto out;
 814
 815         memset(pi, 0, LNET_PINGINFO_SIZE);
 816         for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
 817                 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
 818                 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
 819         }
 820         rcd->rcd_pinginfo = pi;
 821
 822         LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
 823         rc = LNetMDBind((lnet_md_t){.start     = pi,
 824                                     .user_ptr  = rcd,
 825                                     .length    = LNET_PINGINFO_SIZE,
 826                                     .threshold = LNET_MD_THRESH_INF,
 827                                     .options   = LNET_MD_TRUNCATE,
 828                                     .eq_handle = the_lnet.ln_rc_eqh},
 829                         LNET_UNLINK,
 830                         &rcd->rcd_mdh);
 831         if (rc < 0) {
 832                 CERROR("Can't bind MD: %d\n", rc);
 833                 goto out;
 834         }
 835         LASSERT(rc == 0);
 836
 837         LNET_LOCK();
 838         /* router table changed or someone has created rcd for this gateway */
 839         if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
 840                 LNET_UNLOCK();
 841                 goto out;
 842         }
 843
 844         lnet_peer_addref_locked(gateway);
 845         rcd->rcd_gateway = gateway;
 846         gateway->lp_rcd = rcd;
 847         gateway->lp_ping_notsent = 0;
 848
 849         return rcd;
 850
 851  out:
 852         if (rcd != NULL) {
 853                 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
 854                         rc = LNetMDUnlink(rcd->rcd_mdh);
 855                         LASSERT(rc == 0);
 856                 }
 857                 lnet_destroy_rc_data(rcd);
 858         }
 859
 860         LNET_LOCK();
 861         return gateway->lp_rcd;
 862 }
 863
 864 static int
 865 lnet_router_check_interval (lnet_peer_t *rtr)
 866 {
 867         int secs;
 868
 869         secs = rtr->lp_alive ? live_router_check_interval :
 870                                dead_router_check_interval;
 871         if (secs < 0)
 872                 secs = 0;
 873
 874         return secs;
 875 }
 876
 877 static void
 878 lnet_ping_router_locked (lnet_peer_t *rtr)
 879 {
 880         lnet_rc_data_t *rcd = NULL;
 881         cfs_time_t      now = cfs_time_current();
 882         int             secs;
 883
 884         lnet_peer_addref_locked(rtr);
 885
 886         if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
 887             cfs_time_after(now, rtr->lp_ping_deadline))
 888                 lnet_notify_locked(rtr, 1, 0, now);
 889
 890         /* Run any outstanding notifications */
 891         lnet_ni_notify_locked(rtr->lp_ni, rtr);
 892
 893         if (!lnet_isrouter(rtr) ||
 894             the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
 895                 /* router table changed or router checker is shutting down */
 896                 lnet_peer_decref_locked(rtr);
 897                 return;
 898         }
 899
 900         rcd = rtr->lp_rcd != NULL ?
 901               rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
 902
 903         if (rcd == NULL)
 904                 return;
 905
 906         secs = lnet_router_check_interval(rtr);
 907
 908         CDEBUG(D_NET,
 909                "rtr %s %d: deadline %lu ping_notsent %d alive %d "
 910                "alive_count %d lp_ping_timestamp %lu\n",
 911                libcfs_nid2str(rtr->lp_nid), secs,
 912                rtr->lp_ping_deadline, rtr->lp_ping_notsent,
 913                rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
 914
 915         if (secs != 0 && !rtr->lp_ping_notsent &&
 916             cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
 917                                              cfs_time_seconds(secs)))) {
 918                 int               rc;
 919                 lnet_process_id_t id;
 920                 lnet_handle_md_t  mdh;
 921
 922                 id.nid = rtr->lp_nid;
 923                 id.pid = LUSTRE_SRV_LNET_PID;
 924                 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
 925
 926                 rtr->lp_ping_notsent   = 1;
 927                 rtr->lp_ping_timestamp = now;
 928
 929                 mdh = rcd->rcd_mdh;
 930
 931                 if (rtr->lp_ping_deadline == 0) {
 932                         rtr->lp_ping_deadline = \
 933                                 cfs_time_shift(router_ping_timeout);
 934                 }
 935
 936                 LNET_UNLOCK();
 937
 938                 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
 939                              LNET_PROTO_PING_MATCHBITS, 0);
 940
 941                 LNET_LOCK();
 942                 if (rc != 0)
 943                         rtr->lp_ping_notsent = 0; /* no event pending */
 944         }
 945
 946         lnet_peer_decref_locked(rtr);
 947         return;
 948 }
 949
 950 int
 951 lnet_router_checker_start(void)
 952 {
 953         int          rc;
 954         int          eqsz;
 955 #ifndef __KERNEL__
 956         lnet_peer_t *rtr;
 957         __u64        version;
 958         int          nrtr = 0;
 959         int          router_checker_max_eqsize = 10240;
 960
 961         LASSERT (check_routers_before_use);
 962         LASSERT (dead_router_check_interval > 0);
 963
 964         LNET_LOCK();
 965
 966         /* As an approximation, allow each router the same number of
 967          * outstanding events as it is allowed outstanding sends */
 968         eqsz = 0;
 969         version = the_lnet.ln_routers_version;
 970         cfs_list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
 971                 lnet_ni_t         *ni = rtr->lp_ni;
 972                 lnet_process_id_t  id;
 973
 974                 nrtr++;
 975                 eqsz += ni->ni_peertxcredits;
 976
 977                 /* one async ping reply per router */
 978                 id.nid = rtr->lp_nid;
 979                 id.pid = LUSTRE_SRV_LNET_PID;
 980
 981                 LNET_UNLOCK();
 982
 983                 rc = LNetSetAsync(id, 1);
 984                 if (rc != 0) {
 985                         CWARN("LNetSetAsync %s failed: %d\n",
 986                               libcfs_id2str(id), rc);
 987                         return rc;
 988                 }
 989
 990                 LNET_LOCK();
 991                 /* NB router list doesn't change in userspace */
 992                 LASSERT (version == the_lnet.ln_routers_version);
 993         }
 994
 995         LNET_UNLOCK();
 996
 997         if (nrtr == 0) {
 998                 CDEBUG(D_NET,
 999                        "No router found, not starting router checker\n");
1000                 return 0;
1001         }
1002
1003         /* at least allow a SENT and a REPLY per router */
1004         if (router_checker_max_eqsize < 2 * nrtr)
1005                 router_checker_max_eqsize = 2 * nrtr;
1006
1007         LASSERT (eqsz > 0);
1008         if (eqsz > router_checker_max_eqsize)
1009                 eqsz = router_checker_max_eqsize;
1010 #endif
1011
1012         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1013
1014         if (check_routers_before_use &&
1015             dead_router_check_interval <= 0) {
1016                 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
1017                                    " set if 'check_routers_before_use' is set"
1018                                    "\n");
1019                 return -EINVAL;
1020         }
1021
1022         if (!the_lnet.ln_routing &&
1023             live_router_check_interval <= 0 &&
1024             dead_router_check_interval <= 0)
1025                 return 0;
1026
1027 #ifdef __KERNEL__
1028         cfs_sema_init(&the_lnet.ln_rc_signal, 0);
1029         /* EQ size doesn't matter; the callback is guaranteed to get every
1030          * event */
1031         eqsz = 0;
1032         rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1033                          &the_lnet.ln_rc_eqh);
1034 #else
1035         rc = LNetEQAlloc(eqsz, LNET_EQ_HANDLER_NONE,
1036                          &the_lnet.ln_rc_eqh);
1037 #endif
1038         if (rc != 0) {
1039                 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1040                 return -ENOMEM;
1041         }
1042
1043         the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1044 #ifdef __KERNEL__
1045         rc = cfs_create_thread(lnet_router_checker, NULL, 0);
1046         if (rc < 0) {
1047                 CERROR("Can't start router checker thread: %d\n", rc);
1048                 /* block until event callback signals exit */
1049                 cfs_down(&the_lnet.ln_rc_signal);
1050                 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1051                 LASSERT (rc == 0);
1052                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1053                 return -ENOMEM;
1054         }
1055 #endif
1056
1057         if (check_routers_before_use) {
1058                 /* Note that a helpful side-effect of pinging all known routers
1059                  * at startup is that it makes them drop stale connections they
1060                  * may have to a previous instance of me. */
1061                 lnet_wait_known_routerstate();
1062         }
1063
1064         return 0;
1065 }
1066
1067 void
1068 lnet_router_checker_stop (void)
1069 {
1070         int rc;
1071
1072         if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1073                 return;
1074
1075         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1076         the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1077
1078 #ifdef __KERNEL__
1079         /* block until event callback signals exit */
1080         cfs_down(&the_lnet.ln_rc_signal);
1081 #else
1082         lnet_router_checker();
1083 #endif
1084         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1085
1086         rc = LNetEQFree(the_lnet.ln_rc_eqh);
1087         LASSERT (rc == 0);
1088         return;
1089 }
1090
1091 static void
1092 lnet_prune_rc_data(int wait_unlink)
1093 {
1094         lnet_rc_data_t          *rcd;
1095         lnet_rc_data_t          *tmp;
1096         lnet_peer_t             *lp;
1097         cfs_list_t              head;
1098         int                     i = 2;
1099
1100         if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1101                    cfs_list_empty(&the_lnet.ln_rcd_deathrow) &&
1102                    cfs_list_empty(&the_lnet.ln_rcd_zombie)))
1103                 return;
1104
1105         CFS_INIT_LIST_HEAD(&head);
1106
1107         LNET_LOCK();
1108
1109         if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1110                 /* router checker is stopping, prune all */
1111                 cfs_list_for_each_entry(lp, &the_lnet.ln_routers,
1112                                         lp_rtr_list) {
1113                         if (lp->lp_rcd == NULL)
1114                                 continue;
1115
1116                         LASSERT(cfs_list_empty(&lp->lp_rcd->rcd_list));
1117                         cfs_list_add(&lp->lp_rcd->rcd_list,
1118                                      &the_lnet.ln_rcd_deathrow);
1119                         lp->lp_rcd = NULL;
1120                 }
1121         }
1122
1123         /* unlink all RCDs on deathrow list */
1124         cfs_list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1125
1126         if (!cfs_list_empty(&head)) {
1127                 LNET_UNLOCK();
1128
1129                 cfs_list_for_each_entry(rcd, &head, rcd_list)
1130                         LNetMDUnlink(rcd->rcd_mdh);
1131
1132                 LNET_LOCK();
1133         }
1134
1135         cfs_list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1136
1137         /* release all zombie RCDs */
1138         while (!cfs_list_empty(&the_lnet.ln_rcd_zombie)) {
1139                 cfs_list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1140                                              rcd_list) {
1141                         if (!LNetHandleIsInvalid(rcd->rcd_mdh))
1142                                 cfs_list_move(&rcd->rcd_list, &head);
1143                 }
1144
1145                 wait_unlink = wait_unlink &&
1146                               !cfs_list_empty(&the_lnet.ln_rcd_zombie);
1147
1148                 LNET_UNLOCK();
1149
1150                 while (!cfs_list_empty(&head)) {
1151                         rcd = cfs_list_entry(head.next,
1152                                              lnet_rc_data_t, rcd_list);
1153                         cfs_list_del_init(&rcd->rcd_list);
1154                         lnet_destroy_rc_data(rcd);
1155                 }
1156
1157                 if (!wait_unlink)
1158                         break;
1159
1160                 i++;
1161                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1162                        "Waiting for rc buffers to unlink\n");
1163                 cfs_pause(cfs_time_seconds(1) / 4);
1164
1165                 LNET_LOCK();
1166         }
1167 }
1168
1169
1170 #if defined(__KERNEL__) && defined(LNET_ROUTER)
1171
1172 static int
1173 lnet_router_checker(void *arg)
1174 {
1175         lnet_peer_t       *rtr;
1176         cfs_list_t        *entry;
1177
1178         cfs_daemonize("router_checker");
1179         cfs_block_allsigs();
1180
1181         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1182
1183         while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1184                 __u64 version;
1185
1186                 LNET_LOCK();
1187 rescan:
1188                 version = the_lnet.ln_routers_version;
1189
1190                 cfs_list_for_each (entry, &the_lnet.ln_routers) {
1191                         rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list);
1192                         lnet_ping_router_locked(rtr);
1193
1194                         /* NB dropped lock */
1195                         if (version != the_lnet.ln_routers_version) {
1196                                 /* the routers list has changed */
1197                                 goto rescan;
1198                         }
1199                 }
1200
1201                 if (the_lnet.ln_routing)
1202                         lnet_update_ni_status_locked();
1203
1204                 LNET_UNLOCK();
1205
1206                 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1207
1208                 /* Call cfs_pause() here always adds 1 to load average
1209                  * because kernel counts # active tasks as nr_running
1210                  * + nr_uninterruptible. */
1211                 cfs_schedule_timeout_and_set_state(CFS_TASK_INTERRUPTIBLE,
1212                                                    cfs_time_seconds(1));
1213         }
1214
1215         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1216
1217         lnet_prune_rc_data(1); /* wait for UNLINK */
1218
1219         the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1220         cfs_up(&the_lnet.ln_rc_signal);
1221         /* The unlink event callback will signal final completion */
1222         return 0;
1223 }
1224
1225 void
1226 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1227 {
1228         int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1229
1230         while (--npages >= 0)
1231                 cfs_free_page(rb->rb_kiov[npages].kiov_page);
1232
1233         LIBCFS_FREE(rb, sz);
1234 }
1235
1236 lnet_rtrbuf_t *
1237 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp)
1238 {
1239         int            npages = rbp->rbp_npages;
1240         int            sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1241         struct page   *page;
1242         lnet_rtrbuf_t *rb;
1243         int            i;
1244
1245         LIBCFS_ALLOC(rb, sz);
1246         if (rb == NULL)
1247                 return NULL;
1248
1249         rb->rb_pool = rbp;
1250
1251         for (i = 0; i < npages; i++) {
1252                 page = cfs_alloc_page(CFS_ALLOC_ZERO | CFS_ALLOC_STD);
1253                 if (page == NULL) {
1254                         while (--i >= 0)
1255                                 cfs_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 = CFS_PAGE_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         LASSERT (cfs_list_empty(&rbp->rbp_msgs));
1277         LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers);
1278
1279         while (!cfs_list_empty(&rbp->rbp_bufs)) {
1280                 LASSERT (rbp->rbp_credits > 0);
1281
1282                 rb = cfs_list_entry(rbp->rbp_bufs.next,
1283                                     lnet_rtrbuf_t, rb_list);
1284                 cfs_list_del(&rb->rb_list);
1285                 lnet_destroy_rtrbuf(rb, npages);
1286                 nbuffers++;
1287         }
1288
1289         LASSERT (rbp->rbp_nbuffers == nbuffers);
1290         LASSERT (rbp->rbp_credits == nbuffers);
1291
1292         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1293 }
1294
1295 int
1296 lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs)
1297 {
1298         lnet_rtrbuf_t *rb;
1299         int            i;
1300
1301         if (rbp->rbp_nbuffers != 0) {
1302                 LASSERT (rbp->rbp_nbuffers == nbufs);
1303                 return 0;
1304         }
1305
1306         for (i = 0; i < nbufs; i++) {
1307                 rb = lnet_new_rtrbuf(rbp);
1308
1309                 if (rb == NULL) {
1310                         CERROR("Failed to allocate %d router bufs of %d pages\n",
1311                                nbufs, rbp->rbp_npages);
1312                         return -ENOMEM;
1313                 }
1314
1315                 rbp->rbp_nbuffers++;
1316                 rbp->rbp_credits++;
1317                 rbp->rbp_mincredits++;
1318                 cfs_list_add(&rb->rb_list, &rbp->rbp_bufs);
1319
1320                 /* No allocation "under fire" */
1321                 /* Otherwise we'd need code to schedule blocked msgs etc */
1322                 LASSERT (!the_lnet.ln_routing);
1323         }
1324
1325         LASSERT (rbp->rbp_credits == nbufs);
1326         return 0;
1327 }
1328
1329 void
1330 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1331 {
1332         CFS_INIT_LIST_HEAD(&rbp->rbp_msgs);
1333         CFS_INIT_LIST_HEAD(&rbp->rbp_bufs);
1334
1335         rbp->rbp_npages = npages;
1336         rbp->rbp_credits = 0;
1337         rbp->rbp_mincredits = 0;
1338 }
1339
1340 void
1341 lnet_free_rtrpools(void)
1342 {
1343         lnet_rtrpool_free_bufs(&the_lnet.ln_rtrpools[0]);
1344         lnet_rtrpool_free_bufs(&the_lnet.ln_rtrpools[1]);
1345         lnet_rtrpool_free_bufs(&the_lnet.ln_rtrpools[2]);
1346 }
1347
1348 void
1349 lnet_init_rtrpools(void)
1350 {
1351         int small_pages = 1;
1352         int large_pages = (LNET_MTU + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
1353
1354         lnet_rtrpool_init(&the_lnet.ln_rtrpools[0], 0);
1355         lnet_rtrpool_init(&the_lnet.ln_rtrpools[1], small_pages);
1356         lnet_rtrpool_init(&the_lnet.ln_rtrpools[2], large_pages);
1357 }
1358
1359
1360 int
1361 lnet_alloc_rtrpools(int im_a_router)
1362 {
1363         int       rc;
1364
1365         if (!strcmp(forwarding, "")) {
1366                 /* not set either way */
1367                 if (!im_a_router)
1368                         return 0;
1369         } else if (!strcmp(forwarding, "disabled")) {
1370                 /* explicitly disabled */
1371                 return 0;
1372         } else if (!strcmp(forwarding, "enabled")) {
1373                 /* explicitly enabled */
1374         } else {
1375                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1376                                    "'enabled' or 'disabled'\n");
1377                 return -EINVAL;
1378         }
1379
1380         if (tiny_router_buffers <= 0) {
1381                 LCONSOLE_ERROR_MSG(0x10c, "tiny_router_buffers=%d invalid when "
1382                                    "routing enabled\n", tiny_router_buffers);
1383                 rc = -EINVAL;
1384                 goto failed;
1385         }
1386
1387         rc = lnet_rtrpool_alloc_bufs(&the_lnet.ln_rtrpools[0],
1388                                      tiny_router_buffers);
1389         if (rc != 0)
1390                 goto failed;
1391
1392         if (small_router_buffers <= 0) {
1393                 LCONSOLE_ERROR_MSG(0x10d, "small_router_buffers=%d invalid when"
1394                                    " routing enabled\n", small_router_buffers);
1395                 rc = -EINVAL;
1396                 goto failed;
1397         }
1398
1399         rc = lnet_rtrpool_alloc_bufs(&the_lnet.ln_rtrpools[1],
1400                                      small_router_buffers);
1401         if (rc != 0)
1402                 goto failed;
1403
1404         if (large_router_buffers <= 0) {
1405                 LCONSOLE_ERROR_MSG(0x10e, "large_router_buffers=%d invalid when"
1406                                    " routing enabled\n", large_router_buffers);
1407                 rc = -EINVAL;
1408                 goto failed;
1409         }
1410
1411         rc = lnet_rtrpool_alloc_bufs(&the_lnet.ln_rtrpools[2],
1412                                      large_router_buffers);
1413         if (rc != 0)
1414                 goto failed;
1415
1416         LNET_LOCK();
1417         the_lnet.ln_routing = 1;
1418         LNET_UNLOCK();
1419
1420         return 0;
1421
1422  failed:
1423         lnet_free_rtrpools();
1424         return rc;
1425 }
1426
1427 int
1428 lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1429 {
1430         lnet_peer_t *lp = NULL;
1431         cfs_time_t   now = cfs_time_current();
1432
1433         LASSERT (!cfs_in_interrupt ());
1434
1435         CDEBUG (D_NET, "%s notifying %s: %s\n",
1436                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1437                 libcfs_nid2str(nid),
1438                 alive ? "up" : "down");
1439
1440         if (ni != NULL &&
1441             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1442                 CWARN ("Ignoring notification of %s %s by %s (different net)\n",
1443                         libcfs_nid2str(nid), alive ? "birth" : "death",
1444                         libcfs_nid2str(ni->ni_nid));
1445                 return -EINVAL;
1446         }
1447
1448         /* can't do predictions... */
1449         if (cfs_time_after(when, now)) {
1450                 CWARN ("Ignoring prediction from %s of %s %s "
1451                        "%ld seconds in the future\n",
1452                        (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1453                        libcfs_nid2str(nid), alive ? "up" : "down",
1454                        cfs_duration_sec(cfs_time_sub(when, now)));
1455                 return -EINVAL;
1456         }
1457
1458         if (ni != NULL && !alive &&             /* LND telling me she's down */
1459             !auto_down) {                       /* auto-down disabled */
1460                 CDEBUG(D_NET, "Auto-down disabled\n");
1461                 return 0;
1462         }
1463
1464         LNET_LOCK();
1465
1466         lp = lnet_find_peer_locked(nid);
1467         if (lp == NULL) {
1468                 /* nid not found */
1469                 LNET_UNLOCK();
1470                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1471                 return 0;
1472         }
1473
1474         /* We can't fully trust LND on reporting exact peer last_alive
1475          * if he notifies us about dead peer. For example ksocklnd can
1476          * call us with when == _time_when_the_node_was_booted_ if
1477          * no connections were successfully established */
1478         if (ni != NULL && !alive && when < lp->lp_last_alive)
1479                 when = lp->lp_last_alive;
1480
1481         lnet_notify_locked(lp, ni == NULL, alive, when);
1482
1483         lnet_ni_notify_locked(ni, lp);
1484
1485         lnet_peer_decref_locked(lp);
1486
1487         LNET_UNLOCK();
1488         return 0;
1489 }
1490 EXPORT_SYMBOL(lnet_notify);
1491
1492 void
1493 lnet_get_tunables (void)
1494 {
1495         return;
1496 }
1497
1498 #else
1499
1500 int
1501 lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
1502 {
1503         return -EOPNOTSUPP;
1504 }
1505
1506 void
1507 lnet_router_checker (void)
1508 {
1509         static time_t last = 0;
1510         static int    running = 0;
1511
1512         time_t            now = cfs_time_current_sec();
1513         int               interval = now - last;
1514         int               rc;
1515         __u64             version;
1516         lnet_peer_t      *rtr;
1517
1518         /* It's no use to call me again within a sec - all intervals and
1519          * timeouts are measured in seconds */
1520         if (last != 0 && interval < 2)
1521                 return;
1522
1523         if (last != 0 &&
1524             interval > MAX(live_router_check_interval,
1525                            dead_router_check_interval))
1526                 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1527                         live_router_check_interval, dead_router_check_interval,
1528                         interval);
1529
1530         LNET_LOCK();
1531         LASSERT (!running); /* recursion check */
1532         running = 1;
1533         LNET_UNLOCK();
1534
1535         last = now;
1536
1537         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1538                 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1539
1540         /* consume all pending events */
1541         while (1) {
1542                 int          i;
1543                 lnet_event_t ev;
1544
1545                 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1546                  * recursion breaker in LNetEQPoll would fail */
1547                 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1548                 if (rc == 0)   /* no event pending */
1549                         break;
1550
1551                 /* NB a lost SENT prevents me from pinging a router again */
1552                 if (rc == -EOVERFLOW) {
1553                         CERROR("Dropped an event!!!\n");
1554                         abort();
1555                 }
1556
1557                 LASSERT (rc == 1);
1558
1559                 lnet_router_checker_event(&ev);
1560         }
1561
1562         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1563                 lnet_prune_rc_data(1); /* release rcd */
1564                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1565                 running = 0;
1566                 return;
1567         }
1568
1569         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1570
1571         LNET_LOCK();
1572
1573         version = the_lnet.ln_routers_version;
1574         cfs_list_for_each_entry (rtr, &the_lnet.ln_routers, lp_rtr_list) {
1575                 lnet_ping_router_locked(rtr);
1576                 LASSERT (version == the_lnet.ln_routers_version);
1577         }
1578
1579         LNET_UNLOCK();
1580
1581         running = 0; /* lock only needed for the recursion check */
1582         return;
1583 }
1584
1585 /* NB lnet_peers_start_down depends on me,
1586  * so must be called before any peer creation */
1587 void
1588 lnet_get_tunables (void)
1589 {
1590         char *s;
1591
1592         s = getenv("LNET_ROUTER_PING_TIMEOUT");
1593         if (s != NULL) router_ping_timeout = atoi(s);
1594
1595         s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1596         if (s != NULL) live_router_check_interval = atoi(s);
1597
1598         s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1599         if (s != NULL) dead_router_check_interval = atoi(s);
1600
1601         /* This replaces old lnd_notify mechanism */
1602         check_routers_before_use = 1;
1603         if (dead_router_check_interval <= 0)
1604                 dead_router_check_interval = 30;
1605 }
1606
1607 void
1608 lnet_free_rtrpools (void)
1609 {
1610 }
1611
1612 void
1613 lnet_init_rtrpools (void)
1614 {
1615 }
1616
1617 int
1618 lnet_alloc_rtrpools (int im_a_arouter)
1619 {
1620         return 0;
1621 }
1622
1623 #endif