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 "
 461                                        "supported\n",
 462                                        libcfs_net2str(net),
 463                                        libcfs_nid2str(nid1),
 464                                        libcfs_nid2str(nid2));
 465                                 return -EINVAL;
 466                         }
 467                 }
 468         }
 469
 470         lnet_net_unlock(cpt);
 471         return 0;
 472 }
 473
 474 int
 475 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
 476 {
 477         struct lnet_peer        *gateway;
 478         lnet_remotenet_t        *rnet;
 479         lnet_route_t            *route;
 480         struct list_head                *e1;
 481         struct list_head                *e2;
 482         int                     rc = -ENOENT;
 483         struct list_head                *rn_list;
 484         int                     idx = 0;
 485
 486         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 487                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 488
 489         /* NB Caller may specify either all routes via the given gateway
 490          * or a specific route entry actual NIDs) */
 491
 492         lnet_net_lock(LNET_LOCK_EX);
 493         if (net == LNET_NIDNET(LNET_NID_ANY))
 494                 rn_list = &the_lnet.ln_remote_nets_hash[0];
 495         else
 496                 rn_list = lnet_net2rnethash(net);
 497
 498  again:
 499         list_for_each(e1, rn_list) {
 500                 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 501
 502                 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
 503                         net == rnet->lrn_net))
 504                         continue;
 505
 506                 list_for_each(e2, &rnet->lrn_routes) {
 507                         route = list_entry(e2, lnet_route_t, lr_list);
 508
 509                         gateway = route->lr_gateway;
 510                         if (!(gw_nid == LNET_NID_ANY ||
 511                               gw_nid == gateway->lp_nid))
 512                                 continue;
 513
 514                         list_del(&route->lr_list);
 515                         list_del(&route->lr_gwlist);
 516                         the_lnet.ln_remote_nets_version++;
 517
 518                         if (list_empty(&rnet->lrn_routes))
 519                                 list_del(&rnet->lrn_list);
 520                         else
 521                                 rnet = NULL;
 522
 523                         lnet_rtr_decref_locked(gateway);
 524                         lnet_peer_decref_locked(gateway);
 525
 526                         lnet_net_unlock(LNET_LOCK_EX);
 527
 528                         LIBCFS_FREE(route, sizeof(*route));
 529
 530                         if (rnet != NULL)
 531                                 LIBCFS_FREE(rnet, sizeof(*rnet));
 532
 533                         rc = 0;
 534                         lnet_net_lock(LNET_LOCK_EX);
 535                         goto again;
 536                 }
 537         }
 538
 539         if (net == LNET_NIDNET(LNET_NID_ANY) &&
 540             ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
 541                 rn_list = &the_lnet.ln_remote_nets_hash[idx];
 542                 goto again;
 543         }
 544         lnet_net_unlock(LNET_LOCK_EX);
 545
 546         return rc;
 547 }
 548
 549 void
 550 lnet_destroy_routes (void)
 551 {
 552         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 553 }
 554
 555 int
 556 lnet_get_route(int idx, __u32 *net, __u32 *hops,
 557                lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
 558 {
 559         struct list_head                *e1;
 560         struct list_head                *e2;
 561         lnet_remotenet_t        *rnet;
 562         lnet_route_t            *route;
 563         int                     cpt;
 564         int                     i;
 565         struct list_head                *rn_list;
 566
 567         cpt = lnet_net_lock_current();
 568
 569         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 570                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 571                 list_for_each(e1, rn_list) {
 572                         rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 573
 574                         list_for_each(e2, &rnet->lrn_routes) {
 575                                 route = list_entry(e2, lnet_route_t,
 576                                                        lr_list);
 577
 578                                 if (idx-- == 0) {
 579                                         *net      = rnet->lrn_net;
 580                                         *hops     = route->lr_hops;
 581                                         *priority = route->lr_priority;
 582                                         *gateway  = route->lr_gateway->lp_nid;
 583                                         *alive    = route->lr_gateway->lp_alive;
 584                                         lnet_net_unlock(cpt);
 585                                         return 0;
 586                                 }
 587                         }
 588                 }
 589         }
 590
 591         lnet_net_unlock(cpt);
 592         return -ENOENT;
 593 }
 594
 595 void
 596 lnet_swap_pinginfo(lnet_ping_info_t *info)
 597 {
 598         int            i;
 599         lnet_ni_status_t *stat;
 600
 601         __swab32s(&info->pi_magic);
 602         __swab32s(&info->pi_features);
 603         __swab32s(&info->pi_pid);
 604         __swab32s(&info->pi_nnis);
 605         for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 606                 stat = &info->pi_ni[i];
 607                 __swab64s(&stat->ns_nid);
 608                 __swab32s(&stat->ns_status);
 609         }
 610         return;
 611 }
 612
 613 /**
 614  * parse router-checker pinginfo, record number of down NIs for remote
 615  * networks on that router.
 616  */
 617 static void
 618 lnet_parse_rc_info(lnet_rc_data_t *rcd)
 619 {
 620         lnet_ping_info_t        *info = rcd->rcd_pinginfo;
 621         struct lnet_peer        *gw   = rcd->rcd_gateway;
 622         lnet_route_t            *rtr;
 623
 624         if (!gw->lp_alive)
 625                 return;
 626
 627         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
 628                 lnet_swap_pinginfo(info);
 629
 630         /* NB always racing with network! */
 631         if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
 632                 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
 633                        libcfs_nid2str(gw->lp_nid), info->pi_magic);
 634                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 635                 return;
 636         }
 637
 638         gw->lp_ping_feats = info->pi_features;
 639         if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
 640                 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
 641                        libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
 642                 return; /* nothing I can understand */
 643         }
 644
 645         if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
 646                 return; /* can't carry NI status info */
 647
 648         list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
 649                 int     ptl_status = LNET_NI_STATUS_INVALID;
 650                 int     down = 0;
 651                 int     up = 0;
 652                 int     i;
 653
 654                 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 655                         lnet_ni_status_t *stat = &info->pi_ni[i];
 656                         lnet_nid_t       nid = stat->ns_nid;
 657
 658                         if (nid == LNET_NID_ANY) {
 659                                 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
 660                                        libcfs_nid2str(gw->lp_nid));
 661                                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 662                                 return;
 663                         }
 664
 665                         if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
 666                                 continue;
 667
 668                         if (stat->ns_status == LNET_NI_STATUS_DOWN) {
 669                                 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
 670                                         down++;
 671                                 else if (ptl_status != LNET_NI_STATUS_UP)
 672                                         ptl_status = LNET_NI_STATUS_DOWN;
 673                                 continue;
 674                         }
 675
 676                         if (stat->ns_status == LNET_NI_STATUS_UP) {
 677                                 if (LNET_NIDNET(nid) == rtr->lr_net) {
 678                                         up = 1;
 679                                         break;
 680                                 }
 681                                 /* ptl NIs are considered down only when
 682                                  * they're all down */
 683                                 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
 684                                         ptl_status = LNET_NI_STATUS_UP;
 685                                 continue;
 686                         }
 687
 688                         CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
 689                                libcfs_nid2str(gw->lp_nid), stat->ns_status);
 690                         gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 691                         return;
 692                 }
 693
 694                 if (up) { /* ignore downed NIs if NI for dest network is up */
 695                         rtr->lr_downis = 0;
 696                         continue;
 697                 }
 698                 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
 699         }
 700 }
 701
 702 static void
 703 lnet_router_checker_event(lnet_event_t *event)
 704 {
 705         lnet_rc_data_t          *rcd = event->md.user_ptr;
 706         struct lnet_peer        *lp;
 707
 708         LASSERT(rcd != NULL);
 709
 710         if (event->unlinked) {
 711                 LNetInvalidateHandle(&rcd->rcd_mdh);
 712                 return;
 713         }
 714
 715         LASSERT(event->type == LNET_EVENT_SEND ||
 716                 event->type == LNET_EVENT_REPLY);
 717
 718         lp = rcd->rcd_gateway;
 719         LASSERT(lp != NULL);
 720
 721          /* NB: it's called with holding lnet_res_lock, we have a few
 722           * places need to hold both locks at the same time, please take
 723           * care of lock ordering */
 724         lnet_net_lock(lp->lp_cpt);
 725         if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
 726                 /* ignore if no longer a router or rcd is replaced */
 727                 goto out;
 728         }
 729
 730         if (event->type == LNET_EVENT_SEND) {
 731                 lp->lp_ping_notsent = 0;
 732                 if (event->status == 0)
 733                         goto out;
 734         }
 735
 736         /* LNET_EVENT_REPLY */
 737         /* A successful REPLY means the router is up.  If _any_ comms
 738          * to the router fail I assume it's down (this will happen if
 739          * we ping alive routers to try to detect router death before
 740          * apps get burned). */
 741
 742         lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
 743         /* The router checker will wake up very shortly and do the
 744          * actual notification.
 745          * XXX If 'lp' stops being a router before then, it will still
 746          * have the notification pending!!! */
 747
 748         if (avoid_asym_router_failure && event->status == 0)
 749                 lnet_parse_rc_info(rcd);
 750
 751  out:
 752         lnet_net_unlock(lp->lp_cpt);
 753 }
 754
 755 void
 756 lnet_wait_known_routerstate(void)
 757 {
 758         lnet_peer_t      *rtr;
 759         struct list_head          *entry;
 760         int               all_known;
 761
 762         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
 763
 764         for (;;) {
 765                 int     cpt = lnet_net_lock_current();
 766
 767                 all_known = 1;
 768                 list_for_each (entry, &the_lnet.ln_routers) {
 769                         rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
 770
 771                         if (rtr->lp_alive_count == 0) {
 772                                 all_known = 0;
 773                                 break;
 774                         }
 775                 }
 776
 777                 lnet_net_unlock(cpt);
 778
 779                 if (all_known)
 780                         return;
 781
 782                 set_current_state(TASK_UNINTERRUPTIBLE);
 783                 schedule_timeout(cfs_time_seconds(1));
 784         }
 785 }
 786
 787 void
 788 lnet_update_ni_status_locked(void)
 789 {
 790         lnet_ni_t       *ni;
 791         long            now;
 792         int             timeout;
 793
 794         LASSERT(the_lnet.ln_routing);
 795
 796         timeout = router_ping_timeout +
 797                   MAX(live_router_check_interval, dead_router_check_interval);
 798
 799         now = get_seconds();
 800         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 801                 if (ni->ni_lnd->lnd_type == LOLND)
 802                         continue;
 803
 804                 if (now < ni->ni_last_alive + timeout)
 805                         continue;
 806
 807                 lnet_ni_lock(ni);
 808                 /* re-check with lock */
 809                 if (now < ni->ni_last_alive + timeout) {
 810                         lnet_ni_unlock(ni);
 811                         continue;
 812                 }
 813
 814                 LASSERT(ni->ni_status != NULL);
 815
 816                 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
 817                         CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
 818                                libcfs_nid2str(ni->ni_nid), timeout);
 819                         /* NB: so far, this is the only place to set
 820                          * NI status to "down" */
 821                         ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
 822                 }
 823                 lnet_ni_unlock(ni);
 824         }
 825 }
 826
 827 void
 828 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
 829 {
 830         LASSERT(list_empty(&rcd->rcd_list));
 831         /* detached from network */
 832         LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
 833
 834         if (rcd->rcd_gateway != NULL) {
 835                 int cpt = rcd->rcd_gateway->lp_cpt;
 836
 837                 lnet_net_lock(cpt);
 838                 lnet_peer_decref_locked(rcd->rcd_gateway);
 839                 lnet_net_unlock(cpt);
 840         }
 841
 842         if (rcd->rcd_pinginfo != NULL)
 843                 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
 844
 845         LIBCFS_FREE(rcd, sizeof(*rcd));
 846 }
 847
 848 lnet_rc_data_t *
 849 lnet_create_rc_data_locked(lnet_peer_t *gateway)
 850 {
 851         lnet_rc_data_t          *rcd = NULL;
 852         lnet_ping_info_t        *pi;
 853         int                     rc;
 854         int                     i;
 855
 856         lnet_net_unlock(gateway->lp_cpt);
 857
 858         LIBCFS_ALLOC(rcd, sizeof(*rcd));
 859         if (rcd == NULL)
 860                 goto out;
 861
 862         LNetInvalidateHandle(&rcd->rcd_mdh);
 863         INIT_LIST_HEAD(&rcd->rcd_list);
 864
 865         LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
 866         if (pi == NULL)
 867                 goto out;
 868
 869         for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
 870                 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
 871                 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
 872         }
 873         rcd->rcd_pinginfo = pi;
 874
 875         LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
 876         rc = LNetMDBind((lnet_md_t){.start     = pi,
 877                                     .user_ptr  = rcd,
 878                                     .length    = LNET_PINGINFO_SIZE,
 879                                     .threshold = LNET_MD_THRESH_INF,
 880                                     .options   = LNET_MD_TRUNCATE,
 881                                     .eq_handle = the_lnet.ln_rc_eqh},
 882                         LNET_UNLINK,
 883                         &rcd->rcd_mdh);
 884         if (rc < 0) {
 885                 CERROR("Can't bind MD: %d\n", rc);
 886                 goto out;
 887         }
 888         LASSERT(rc == 0);
 889
 890         lnet_net_lock(gateway->lp_cpt);
 891         /* router table changed or someone has created rcd for this gateway */
 892         if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
 893                 lnet_net_unlock(gateway->lp_cpt);
 894                 goto out;
 895         }
 896
 897         lnet_peer_addref_locked(gateway);
 898         rcd->rcd_gateway = gateway;
 899         gateway->lp_rcd = rcd;
 900         gateway->lp_ping_notsent = 0;
 901
 902         return rcd;
 903
 904  out:
 905         if (rcd != NULL) {
 906                 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
 907                         rc = LNetMDUnlink(rcd->rcd_mdh);
 908                         LASSERT(rc == 0);
 909                 }
 910                 lnet_destroy_rc_data(rcd);
 911         }
 912
 913         lnet_net_lock(gateway->lp_cpt);
 914         return gateway->lp_rcd;
 915 }
 916
 917 static int
 918 lnet_router_check_interval (lnet_peer_t *rtr)
 919 {
 920         int secs;
 921
 922         secs = rtr->lp_alive ? live_router_check_interval :
 923                                dead_router_check_interval;
 924         if (secs < 0)
 925                 secs = 0;
 926
 927         return secs;
 928 }
 929
 930 static void
 931 lnet_ping_router_locked (lnet_peer_t *rtr)
 932 {
 933         lnet_rc_data_t *rcd = NULL;
 934         unsigned long      now = cfs_time_current();
 935         int          secs;
 936
 937         lnet_peer_addref_locked(rtr);
 938
 939         if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
 940             cfs_time_after(now, rtr->lp_ping_deadline))
 941                 lnet_notify_locked(rtr, 1, 0, now);
 942
 943         /* Run any outstanding notifications */
 944         lnet_ni_notify_locked(rtr->lp_ni, rtr);
 945
 946         if (!lnet_isrouter(rtr) ||
 947             the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
 948                 /* router table changed or router checker is shutting down */
 949                 lnet_peer_decref_locked(rtr);
 950                 return;
 951         }
 952
 953         rcd = rtr->lp_rcd != NULL ?
 954               rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
 955
 956         if (rcd == NULL)
 957                 return;
 958
 959         secs = lnet_router_check_interval(rtr);
 960
 961         CDEBUG(D_NET,
 962                "rtr %s %d: deadline %lu ping_notsent %d alive %d "
 963                "alive_count %d lp_ping_timestamp %lu\n",
 964                libcfs_nid2str(rtr->lp_nid), secs,
 965                rtr->lp_ping_deadline, rtr->lp_ping_notsent,
 966                rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
 967
 968         if (secs != 0 && !rtr->lp_ping_notsent &&
 969             cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
 970                                              cfs_time_seconds(secs)))) {
 971                 int            rc;
 972                 lnet_process_id_t id;
 973                 lnet_handle_md_t  mdh;
 974
 975                 id.nid = rtr->lp_nid;
 976                 id.pid = LUSTRE_SRV_LNET_PID;
 977                 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
 978
 979                 rtr->lp_ping_notsent   = 1;
 980                 rtr->lp_ping_timestamp = now;
 981
 982                 mdh = rcd->rcd_mdh;
 983
 984                 if (rtr->lp_ping_deadline == 0) {
 985                         rtr->lp_ping_deadline =
 986                                 cfs_time_shift(router_ping_timeout);
 987                 }
 988
 989                 lnet_net_unlock(rtr->lp_cpt);
 990
 991                 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
 992                              LNET_PROTO_PING_MATCHBITS, 0);
 993
 994                 lnet_net_lock(rtr->lp_cpt);
 995                 if (rc != 0)
 996                         rtr->lp_ping_notsent = 0; /* no event pending */
 997         }
 998
 999         lnet_peer_decref_locked(rtr);
1000         return;
1001 }
1002
1003 int
1004 lnet_router_checker_start(void)
1005 {
1006         int       rc;
1007         int       eqsz;
1008
1009         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1010
1011         if (check_routers_before_use &&
1012             dead_router_check_interval <= 0) {
1013                 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
1014                                    " set if 'check_routers_before_use' is set"
1015                                    "\n");
1016                 return -EINVAL;
1017         }
1018
1019         if (!the_lnet.ln_routing &&
1020             live_router_check_interval <= 0 &&
1021             dead_router_check_interval <= 0)
1022                 return 0;
1023
1024         sema_init(&the_lnet.ln_rc_signal, 0);
1025         /* EQ size doesn't matter; the callback is guaranteed to get every
1026          * event */
1027         eqsz = 0;
1028         rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1029                          &the_lnet.ln_rc_eqh);
1030         if (rc != 0) {
1031                 CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
1032                 return -ENOMEM;
1033         }
1034
1035         the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
1036         rc = PTR_ERR(kthread_run(lnet_router_checker,
1037                                  NULL, "router_checker"));
1038         if (IS_ERR_VALUE(rc)) {
1039                 CERROR("Can't start router checker thread: %d\n", rc);
1040                 /* block until event callback signals exit */
1041                 down(&the_lnet.ln_rc_signal);
1042                 rc = LNetEQFree(the_lnet.ln_rc_eqh);
1043                 LASSERT(rc == 0);
1044                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1045                 return -ENOMEM;
1046         }
1047
1048         if (check_routers_before_use) {
1049                 /* Note that a helpful side-effect of pinging all known routers
1050                  * at startup is that it makes them drop stale connections they
1051                  * may have to a previous instance of me. */
1052                 lnet_wait_known_routerstate();
1053         }
1054
1055         return 0;
1056 }
1057
1058 void
1059 lnet_router_checker_stop (void)
1060 {
1061         int rc;
1062
1063         if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1064                 return;
1065
1066         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1067         the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1068
1069         /* block until event callback signals exit */
1070         down(&the_lnet.ln_rc_signal);
1071         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1072
1073         rc = LNetEQFree(the_lnet.ln_rc_eqh);
1074         LASSERT (rc == 0);
1075         return;
1076 }
1077
1078 static void
1079 lnet_prune_rc_data(int wait_unlink)
1080 {
1081         lnet_rc_data_t          *rcd;
1082         lnet_rc_data_t          *tmp;
1083         lnet_peer_t             *lp;
1084         struct list_head                head;
1085         int                     i = 2;
1086
1087         if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1088                    list_empty(&the_lnet.ln_rcd_deathrow) &&
1089                    list_empty(&the_lnet.ln_rcd_zombie)))
1090                 return;
1091
1092         INIT_LIST_HEAD(&head);
1093
1094         lnet_net_lock(LNET_LOCK_EX);
1095
1096         if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1097                 /* router checker is stopping, prune all */
1098                 list_for_each_entry(lp, &the_lnet.ln_routers,
1099                                         lp_rtr_list) {
1100                         if (lp->lp_rcd == NULL)
1101                                 continue;
1102
1103                         LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1104                         list_add(&lp->lp_rcd->rcd_list,
1105                                      &the_lnet.ln_rcd_deathrow);
1106                         lp->lp_rcd = NULL;
1107                 }
1108         }
1109
1110         /* unlink all RCDs on deathrow list */
1111         list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1112
1113         if (!list_empty(&head)) {
1114                 lnet_net_unlock(LNET_LOCK_EX);
1115
1116                 list_for_each_entry(rcd, &head, rcd_list)
1117                         LNetMDUnlink(rcd->rcd_mdh);
1118
1119                 lnet_net_lock(LNET_LOCK_EX);
1120         }
1121
1122         list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1123
1124         /* release all zombie RCDs */
1125         while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1126                 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1127                                              rcd_list) {
1128                         if (LNetHandleIsInvalid(rcd->rcd_mdh))
1129                                 list_move(&rcd->rcd_list, &head);
1130                 }
1131
1132                 wait_unlink = wait_unlink &&
1133                               !list_empty(&the_lnet.ln_rcd_zombie);
1134
1135                 lnet_net_unlock(LNET_LOCK_EX);
1136
1137                 while (!list_empty(&head)) {
1138                         rcd = list_entry(head.next,
1139                                              lnet_rc_data_t, rcd_list);
1140                         list_del_init(&rcd->rcd_list);
1141                         lnet_destroy_rc_data(rcd);
1142                 }
1143
1144                 if (!wait_unlink)
1145                         return;
1146
1147                 i++;
1148                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1149                        "Waiting for rc buffers to unlink\n");
1150                 set_current_state(TASK_UNINTERRUPTIBLE);
1151                 schedule_timeout(cfs_time_seconds(1) / 4);
1152
1153                 lnet_net_lock(LNET_LOCK_EX);
1154         }
1155
1156         lnet_net_unlock(LNET_LOCK_EX);
1157 }
1158
1159
1160 #if  defined(LNET_ROUTER)
1161
1162 static int
1163 lnet_router_checker(void *arg)
1164 {
1165         lnet_peer_t       *rtr;
1166         struct list_head        *entry;
1167
1168         cfs_block_allsigs();
1169
1170         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1171
1172         while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1173                 __u64   version;
1174                 int     cpt;
1175                 int     cpt2;
1176
1177                 cpt = lnet_net_lock_current();
1178 rescan:
1179                 version = the_lnet.ln_routers_version;
1180
1181                 list_for_each(entry, &the_lnet.ln_routers) {
1182                         rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1183
1184                         cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1185                         if (cpt != cpt2) {
1186                                 lnet_net_unlock(cpt);
1187                                 cpt = cpt2;
1188                                 lnet_net_lock(cpt);
1189                                 /* the routers list has changed */
1190                                 if (version != the_lnet.ln_routers_version)
1191                                         goto rescan;
1192                         }
1193
1194                         lnet_ping_router_locked(rtr);
1195
1196                         /* NB dropped lock */
1197                         if (version != the_lnet.ln_routers_version) {
1198                                 /* the routers list has changed */
1199                                 goto rescan;
1200                         }
1201                 }
1202
1203                 if (the_lnet.ln_routing)
1204                         lnet_update_ni_status_locked();
1205
1206                 lnet_net_unlock(cpt);
1207
1208                 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1209
1210                 /* Call schedule_timeout() here always adds 1 to load average
1211                  * because kernel counts # active tasks as nr_running
1212                  * + nr_uninterruptible. */
1213                 set_current_state(TASK_INTERRUPTIBLE);
1214                 schedule_timeout(cfs_time_seconds(1));
1215         }
1216
1217         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1218
1219         lnet_prune_rc_data(1); /* wait for UNLINK */
1220
1221         the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1222         up(&the_lnet.ln_rc_signal);
1223         /* The unlink event callback will signal final completion */
1224         return 0;
1225 }
1226
1227 void
1228 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1229 {
1230         int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1231
1232         while (--npages >= 0)
1233                 __free_page(rb->rb_kiov[npages].kiov_page);
1234
1235         LIBCFS_FREE(rb, sz);
1236 }
1237
1238 lnet_rtrbuf_t *
1239 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1240 {
1241         int         npages = rbp->rbp_npages;
1242         int         sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1243         struct page   *page;
1244         lnet_rtrbuf_t *rb;
1245         int         i;
1246
1247         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1248         if (rb == NULL)
1249                 return NULL;
1250
1251         rb->rb_pool = rbp;
1252
1253         for (i = 0; i < npages; i++) {
1254                 page = alloc_pages_node(
1255                                 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1256                                 __GFP_ZERO | GFP_IOFS, 0);
1257                 if (page == NULL) {
1258                         while (--i >= 0)
1259                                 __free_page(rb->rb_kiov[i].kiov_page);
1260
1261                         LIBCFS_FREE(rb, sz);
1262                         return NULL;
1263                 }
1264
1265                 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1266                 rb->rb_kiov[i].kiov_offset = 0;
1267                 rb->rb_kiov[i].kiov_page = page;
1268         }
1269
1270         return rb;
1271 }
1272
1273 void
1274 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
1275 {
1276         int             npages = rbp->rbp_npages;
1277         int             nbuffers = 0;
1278         lnet_rtrbuf_t   *rb;
1279
1280         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1281                 return;
1282
1283         LASSERT (list_empty(&rbp->rbp_msgs));
1284         LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers);
1285
1286         while (!list_empty(&rbp->rbp_bufs)) {
1287                 LASSERT (rbp->rbp_credits > 0);
1288
1289                 rb = list_entry(rbp->rbp_bufs.next,
1290                                     lnet_rtrbuf_t, rb_list);
1291                 list_del(&rb->rb_list);
1292                 lnet_destroy_rtrbuf(rb, npages);
1293                 nbuffers++;
1294         }
1295
1296         LASSERT (rbp->rbp_nbuffers == nbuffers);
1297         LASSERT (rbp->rbp_credits == nbuffers);
1298
1299         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1300 }
1301
1302 int
1303 lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1304 {
1305         lnet_rtrbuf_t *rb;
1306         int         i;
1307
1308         if (rbp->rbp_nbuffers != 0) {
1309                 LASSERT (rbp->rbp_nbuffers == nbufs);
1310                 return 0;
1311         }
1312
1313         for (i = 0; i < nbufs; i++) {
1314                 rb = lnet_new_rtrbuf(rbp, cpt);
1315
1316                 if (rb == NULL) {
1317                         CERROR("Failed to allocate %d router bufs of %d pages\n",
1318                                nbufs, rbp->rbp_npages);
1319                         return -ENOMEM;
1320                 }
1321
1322                 rbp->rbp_nbuffers++;
1323                 rbp->rbp_credits++;
1324                 rbp->rbp_mincredits++;
1325                 list_add(&rb->rb_list, &rbp->rbp_bufs);
1326
1327                 /* No allocation "under fire" */
1328                 /* Otherwise we'd need code to schedule blocked msgs etc */
1329                 LASSERT (!the_lnet.ln_routing);
1330         }
1331
1332         LASSERT (rbp->rbp_credits == nbufs);
1333         return 0;
1334 }
1335
1336 void
1337 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1338 {
1339         INIT_LIST_HEAD(&rbp->rbp_msgs);
1340         INIT_LIST_HEAD(&rbp->rbp_bufs);
1341
1342         rbp->rbp_npages = npages;
1343         rbp->rbp_credits = 0;
1344         rbp->rbp_mincredits = 0;
1345 }
1346
1347 void
1348 lnet_rtrpools_free(void)
1349 {
1350         lnet_rtrbufpool_t *rtrp;
1351         int               i;
1352
1353         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1354                 return;
1355
1356         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1357                 lnet_rtrpool_free_bufs(&rtrp[0]);
1358                 lnet_rtrpool_free_bufs(&rtrp[1]);
1359                 lnet_rtrpool_free_bufs(&rtrp[2]);
1360         }
1361
1362         cfs_percpt_free(the_lnet.ln_rtrpools);
1363         the_lnet.ln_rtrpools = NULL;
1364 }
1365
1366 static int
1367 lnet_nrb_tiny_calculate(int npages)
1368 {
1369         int     nrbs = LNET_NRB_TINY;
1370
1371         if (tiny_router_buffers < 0) {
1372                 LCONSOLE_ERROR_MSG(0x10c,
1373                                    "tiny_router_buffers=%d invalid when "
1374                                    "routing enabled\n", tiny_router_buffers);
1375                 return -1;
1376         }
1377
1378         if (tiny_router_buffers > 0)
1379                 nrbs = tiny_router_buffers;
1380
1381         nrbs /= LNET_CPT_NUMBER;
1382         return max(nrbs, LNET_NRB_TINY_MIN);
1383 }
1384
1385 static int
1386 lnet_nrb_small_calculate(int npages)
1387 {
1388         int     nrbs = LNET_NRB_SMALL;
1389
1390         if (small_router_buffers < 0) {
1391                 LCONSOLE_ERROR_MSG(0x10c,
1392                                    "small_router_buffers=%d invalid when "
1393                                    "routing enabled\n", small_router_buffers);
1394                 return -1;
1395         }
1396
1397         if (small_router_buffers > 0)
1398                 nrbs = small_router_buffers;
1399
1400         nrbs /= LNET_CPT_NUMBER;
1401         return max(nrbs, LNET_NRB_SMALL_MIN);
1402 }
1403
1404 static int
1405 lnet_nrb_large_calculate(int npages)
1406 {
1407         int     nrbs = LNET_NRB_LARGE;
1408
1409         if (large_router_buffers < 0) {
1410                 LCONSOLE_ERROR_MSG(0x10c,
1411                                    "large_router_buffers=%d invalid when "
1412                                    "routing enabled\n", large_router_buffers);
1413                 return -1;
1414         }
1415
1416         if (large_router_buffers > 0)
1417                 nrbs = large_router_buffers;
1418
1419         nrbs /= LNET_CPT_NUMBER;
1420         return max(nrbs, LNET_NRB_LARGE_MIN);
1421 }
1422
1423 int
1424 lnet_rtrpools_alloc(int im_a_router)
1425 {
1426         lnet_rtrbufpool_t *rtrp;
1427         int     large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1428         int     small_pages = 1;
1429         int     nrb_tiny;
1430         int     nrb_small;
1431         int     nrb_large;
1432         int     rc;
1433         int     i;
1434
1435         if (!strcmp(forwarding, "")) {
1436                 /* not set either way */
1437                 if (!im_a_router)
1438                         return 0;
1439         } else if (!strcmp(forwarding, "disabled")) {
1440                 /* explicitly disabled */
1441                 return 0;
1442         } else if (!strcmp(forwarding, "enabled")) {
1443                 /* explicitly enabled */
1444         } else {
1445                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1446                                    "'enabled' or 'disabled'\n");
1447                 return -EINVAL;
1448         }
1449
1450         nrb_tiny = lnet_nrb_tiny_calculate(0);
1451         if (nrb_tiny < 0)
1452                 return -EINVAL;
1453
1454         nrb_small = lnet_nrb_small_calculate(small_pages);
1455         if (nrb_small < 0)
1456                 return -EINVAL;
1457
1458         nrb_large = lnet_nrb_large_calculate(large_pages);
1459         if (nrb_large < 0)
1460                 return -EINVAL;
1461
1462         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1463                                                 LNET_NRBPOOLS *
1464                                                 sizeof(lnet_rtrbufpool_t));
1465         if (the_lnet.ln_rtrpools == NULL) {
1466                 LCONSOLE_ERROR_MSG(0x10c,
1467                                    "Failed to initialize router buffe pool\n");
1468                 return -ENOMEM;
1469         }
1470
1471         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1472                 lnet_rtrpool_init(&rtrp[0], 0);
1473                 rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i);
1474                 if (rc != 0)
1475                         goto failed;
1476
1477                 lnet_rtrpool_init(&rtrp[1], small_pages);
1478                 rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i);
1479                 if (rc != 0)
1480                         goto failed;
1481
1482                 lnet_rtrpool_init(&rtrp[2], large_pages);
1483                 rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i);
1484                 if (rc != 0)
1485                         goto failed;
1486         }
1487
1488         lnet_net_lock(LNET_LOCK_EX);
1489         the_lnet.ln_routing = 1;
1490         lnet_net_unlock(LNET_LOCK_EX);
1491
1492         return 0;
1493
1494  failed:
1495         lnet_rtrpools_free();
1496         return rc;
1497 }
1498
1499 int
1500 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1501 {
1502         struct lnet_peer        *lp = NULL;
1503         unsigned long           now = cfs_time_current();
1504         int                     cpt = lnet_cpt_of_nid(nid);
1505
1506         LASSERT (!in_interrupt ());
1507
1508         CDEBUG (D_NET, "%s notifying %s: %s\n",
1509                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1510                 libcfs_nid2str(nid),
1511                 alive ? "up" : "down");
1512
1513         if (ni != NULL &&
1514             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1515                 CWARN ("Ignoring notification of %s %s by %s (different net)\n",
1516                         libcfs_nid2str(nid), alive ? "birth" : "death",
1517                         libcfs_nid2str(ni->ni_nid));
1518                 return -EINVAL;
1519         }
1520
1521         /* can't do predictions... */
1522         if (cfs_time_after(when, now)) {
1523                 CWARN ("Ignoring prediction from %s of %s %s "
1524                        "%ld seconds in the future\n",
1525                        (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1526                        libcfs_nid2str(nid), alive ? "up" : "down",
1527                        cfs_duration_sec(cfs_time_sub(when, now)));
1528                 return -EINVAL;
1529         }
1530
1531         if (ni != NULL && !alive &&          /* LND telling me she's down */
1532             !auto_down) {                      /* auto-down disabled */
1533                 CDEBUG(D_NET, "Auto-down disabled\n");
1534                 return 0;
1535         }
1536
1537         lnet_net_lock(cpt);
1538
1539         if (the_lnet.ln_shutdown) {
1540                 lnet_net_unlock(cpt);
1541                 return -ESHUTDOWN;
1542         }
1543
1544         lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1545         if (lp == NULL) {
1546                 /* nid not found */
1547                 lnet_net_unlock(cpt);
1548                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1549                 return 0;
1550         }
1551
1552         /* We can't fully trust LND on reporting exact peer last_alive
1553          * if he notifies us about dead peer. For example ksocklnd can
1554          * call us with when == _time_when_the_node_was_booted_ if
1555          * no connections were successfully established */
1556         if (ni != NULL && !alive && when < lp->lp_last_alive)
1557                 when = lp->lp_last_alive;
1558
1559         lnet_notify_locked(lp, ni == NULL, alive, when);
1560
1561         lnet_ni_notify_locked(ni, lp);
1562
1563         lnet_peer_decref_locked(lp);
1564
1565         lnet_net_unlock(cpt);
1566         return 0;
1567 }
1568 EXPORT_SYMBOL(lnet_notify);
1569
1570 void
1571 lnet_get_tunables (void)
1572 {
1573         return;
1574 }
1575
1576 #else
1577
1578 int
1579 lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1580 {
1581         return -EOPNOTSUPP;
1582 }
1583
1584 void
1585 lnet_router_checker (void)
1586 {
1587         static time_t last = 0;
1588         static int    running = 0;
1589
1590         time_t      now = get_seconds();
1591         int            interval = now - last;
1592         int            rc;
1593         __u64        version;
1594         lnet_peer_t      *rtr;
1595
1596         /* It's no use to call me again within a sec - all intervals and
1597          * timeouts are measured in seconds */
1598         if (last != 0 && interval < 2)
1599                 return;
1600
1601         if (last != 0 &&
1602             interval > MAX(live_router_check_interval,
1603                            dead_router_check_interval))
1604                 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1605                         live_router_check_interval, dead_router_check_interval,
1606                         interval);
1607
1608         LASSERT(LNET_CPT_NUMBER == 1);
1609
1610         lnet_net_lock(0);
1611         LASSERT(!running); /* recursion check */
1612         running = 1;
1613         lnet_net_unlock(0);
1614
1615         last = now;
1616
1617         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1618                 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1619
1620         /* consume all pending events */
1621         while (1) {
1622                 int       i;
1623                 lnet_event_t ev;
1624
1625                 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1626                  * recursion breaker in LNetEQPoll would fail */
1627                 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1628                 if (rc == 0)   /* no event pending */
1629                         break;
1630
1631                 /* NB a lost SENT prevents me from pinging a router again */
1632                 if (rc == -EOVERFLOW) {
1633                         CERROR("Dropped an event!!!\n");
1634                         abort();
1635                 }
1636
1637                 LASSERT (rc == 1);
1638
1639                 lnet_router_checker_event(&ev);
1640         }
1641
1642         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1643                 lnet_prune_rc_data(1); /* release rcd */
1644                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1645                 running = 0;
1646                 return;
1647         }
1648
1649         LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1650
1651         lnet_net_lock(0);
1652
1653         version = the_lnet.ln_routers_version;
1654         list_for_each_entry (rtr, &the_lnet.ln_routers, lp_rtr_list) {
1655                 lnet_ping_router_locked(rtr);
1656                 LASSERT (version == the_lnet.ln_routers_version);
1657         }
1658
1659         lnet_net_unlock(0);
1660
1661         running = 0; /* lock only needed for the recursion check */
1662         return;
1663 }
1664
1665 /* NB lnet_peers_start_down depends on me,
1666  * so must be called before any peer creation */
1667 void
1668 lnet_get_tunables (void)
1669 {
1670         char *s;
1671
1672         s = getenv("LNET_ROUTER_PING_TIMEOUT");
1673         if (s != NULL) router_ping_timeout = atoi(s);
1674
1675         s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1676         if (s != NULL) live_router_check_interval = atoi(s);
1677
1678         s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1679         if (s != NULL) dead_router_check_interval = atoi(s);
1680
1681         /* This replaces old lnd_notify mechanism */
1682         check_routers_before_use = 1;
1683         if (dead_router_check_interval <= 0)
1684                 dead_router_check_interval = 30;
1685 }
1686
1687 void
1688 lnet_rtrpools_free(void)
1689 {
1690 }
1691
1692 int
1693 lnet_rtrpools_alloc(int im_a_arouter)
1694 {
1695         return 0;
1696 }
1697
1698 #endif