kernel/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;
  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;
  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 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,
 111                    unsigned long when)
 112 {
 113         if (time_before(when, lp->lp_timestamp)) { /* out of date information */
 114                 CDEBUG(D_NET, "Out of date\n");
 115                 return;
 116         }
 117
 118         lp->lp_timestamp = when;                /* update timestamp */
 119         lp->lp_ping_deadline = 0;              /* disable ping timeout */
 120
 121         if (lp->lp_alive_count != 0 &&    /* got old news */
 122             (!lp->lp_alive) == (!alive)) {      /* new date for old news */
 123                 CDEBUG(D_NET, "Old news\n");
 124                 return;
 125         }
 126
 127         /* Flag that notification is outstanding */
 128
 129         lp->lp_alive_count++;
 130         lp->lp_alive = !(!alive);              /* 1 bit! */
 131         lp->lp_notify = 1;
 132         lp->lp_notifylnd |= notifylnd;
 133         if (lp->lp_alive)
 134                 lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
 135
 136         CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
 137 }
 138
 139 static void
 140 lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
 141 {
 142         int     alive;
 143         int     notifylnd;
 144
 145         /* Notify only in 1 thread at any time to ensure ordered notification.
 146          * NB individual events can be missed; the only guarantee is that you
 147          * always get the most recent news */
 148
 149         if (lp->lp_notifying || ni == NULL)
 150                 return;
 151
 152         lp->lp_notifying = 1;
 153
 154         while (lp->lp_notify) {
 155                 alive     = lp->lp_alive;
 156                 notifylnd = lp->lp_notifylnd;
 157
 158                 lp->lp_notifylnd = 0;
 159                 lp->lp_notify    = 0;
 160
 161                 if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
 162                         lnet_net_unlock(lp->lp_cpt);
 163
 164                         /* A new notification could happen now; I'll handle it
 165                          * when control returns to me */
 166
 167                         (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
 168
 169                         lnet_net_lock(lp->lp_cpt);
 170                 }
 171         }
 172
 173         lp->lp_notifying = 0;
 174 }
 175
 176
 177 static void
 178 lnet_rtr_addref_locked(lnet_peer_t *lp)
 179 {
 180         LASSERT(lp->lp_refcount > 0);
 181         LASSERT(lp->lp_rtr_refcount >= 0);
 182
 183         /* lnet_net_lock must be exclusively locked */
 184         lp->lp_rtr_refcount++;
 185         if (lp->lp_rtr_refcount == 1) {
 186                 struct list_head *pos;
 187
 188                 /* a simple insertion sort */
 189                 list_for_each_prev(pos, &the_lnet.ln_routers) {
 190                         lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
 191                                                           lp_rtr_list);
 192
 193                         if (rtr->lp_nid < lp->lp_nid)
 194                                 break;
 195                 }
 196
 197                 list_add(&lp->lp_rtr_list, pos);
 198                 /* addref for the_lnet.ln_routers */
 199                 lnet_peer_addref_locked(lp);
 200                 the_lnet.ln_routers_version++;
 201         }
 202 }
 203
 204 static void
 205 lnet_rtr_decref_locked(lnet_peer_t *lp)
 206 {
 207         LASSERT(lp->lp_refcount > 0);
 208         LASSERT(lp->lp_rtr_refcount > 0);
 209
 210         /* lnet_net_lock must be exclusively locked */
 211         lp->lp_rtr_refcount--;
 212         if (lp->lp_rtr_refcount == 0) {
 213                 LASSERT(list_empty(&lp->lp_routes));
 214
 215                 if (lp->lp_rcd != NULL) {
 216                         list_add(&lp->lp_rcd->rcd_list,
 217                                      &the_lnet.ln_rcd_deathrow);
 218                         lp->lp_rcd = NULL;
 219                 }
 220
 221                 list_del(&lp->lp_rtr_list);
 222                 /* decref for the_lnet.ln_routers */
 223                 lnet_peer_decref_locked(lp);
 224                 the_lnet.ln_routers_version++;
 225         }
 226 }
 227
 228 lnet_remotenet_t *
 229 lnet_find_net_locked(__u32 net)
 230 {
 231         lnet_remotenet_t        *rnet;
 232         struct list_head                *tmp;
 233         struct list_head                *rn_list;
 234
 235         LASSERT(!the_lnet.ln_shutdown);
 236
 237         rn_list = lnet_net2rnethash(net);
 238         list_for_each(tmp, rn_list) {
 239                 rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
 240
 241                 if (rnet->lrn_net == net)
 242                         return rnet;
 243         }
 244         return NULL;
 245 }
 246
 247 static void lnet_shuffle_seed(void)
 248 {
 249         static int seeded;
 250         int lnd_type, seed[2];
 251         struct timeval tv;
 252         lnet_ni_t *ni;
 253         struct list_head *tmp;
 254
 255         if (seeded)
 256                 return;
 257
 258         cfs_get_random_bytes(seed, sizeof(seed));
 259
 260         /* Nodes with small feet have little entropy
 261          * the NID for this node gives the most entropy in the low bits */
 262         list_for_each(tmp, &the_lnet.ln_nis) {
 263                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 264                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
 265
 266                 if (lnd_type != LOLND)
 267                         seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
 268         }
 269
 270         do_gettimeofday(&tv);
 271         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 272         seeded = 1;
 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                 CERROR("Error %d creating route %s %d %s\n", rc,
 360                        libcfs_net2str(net), hops,
 361                        libcfs_nid2str(gateway));
 362
 363                 return rc;
 364         }
 365
 366         LASSERT(!the_lnet.ln_shutdown);
 367
 368         rnet2 = lnet_find_net_locked(net);
 369         if (rnet2 == NULL) {
 370                 /* new network */
 371                 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
 372                 rnet2 = rnet;
 373         }
 374
 375         /* Search for a duplicate route (it's a NOOP if it is) */
 376         add_route = 1;
 377         list_for_each(e, &rnet2->lrn_routes) {
 378                 lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
 379
 380                 if (route2->lr_gateway == route->lr_gateway) {
 381                         add_route = 0;
 382                         break;
 383                 }
 384
 385                 /* our lookups must be true */
 386                 LASSERT(route2->lr_gateway->lp_nid != gateway);
 387         }
 388
 389         if (add_route) {
 390                 lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
 391                 lnet_add_route_to_rnet(rnet2, route);
 392
 393                 ni = route->lr_gateway->lp_ni;
 394                 lnet_net_unlock(LNET_LOCK_EX);
 395
 396                 /* XXX Assume alive */
 397                 if (ni->ni_lnd->lnd_notify != NULL)
 398                         (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
 399
 400                 lnet_net_lock(LNET_LOCK_EX);
 401         }
 402
 403         /* -1 for notify or !add_route */
 404         lnet_peer_decref_locked(route->lr_gateway);
 405         lnet_net_unlock(LNET_LOCK_EX);
 406
 407         if (!add_route)
 408                 LIBCFS_FREE(route, sizeof(*route));
 409
 410         if (rnet != rnet2)
 411                 LIBCFS_FREE(rnet, sizeof(*rnet));
 412
 413         return 0;
 414 }
 415
 416 int
 417 lnet_check_routes(void)
 418 {
 419         lnet_remotenet_t        *rnet;
 420         lnet_route_t            *route;
 421         lnet_route_t            *route2;
 422         struct list_head                *e1;
 423         struct list_head                *e2;
 424         int                     cpt;
 425         struct list_head                *rn_list;
 426         int                     i;
 427
 428         cpt = lnet_net_lock_current();
 429
 430         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 431                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 432                 list_for_each(e1, rn_list) {
 433                         rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 434
 435                         route2 = NULL;
 436                         list_for_each(e2, &rnet->lrn_routes) {
 437                                 lnet_nid_t      nid1;
 438                                 lnet_nid_t      nid2;
 439                                 int             net;
 440
 441                                 route = list_entry(e2, lnet_route_t,
 442                                                        lr_list);
 443
 444                                 if (route2 == NULL) {
 445                                         route2 = route;
 446                                         continue;
 447                                 }
 448
 449                                 if (route->lr_gateway->lp_ni ==
 450                                     route2->lr_gateway->lp_ni)
 451                                         continue;
 452
 453                                 nid1 = route->lr_gateway->lp_nid;
 454                                 nid2 = route2->lr_gateway->lp_nid;
 455                                 net = rnet->lrn_net;
 456
 457                                 lnet_net_unlock(cpt);
 458
 459                                 CERROR("Routes to %s via %s and %s not supported\n",
 460                                        libcfs_net2str(net),
 461                                        libcfs_nid2str(nid1),
 462                                        libcfs_nid2str(nid2));
 463                                 return -EINVAL;
 464                         }
 465                 }
 466         }
 467
 468         lnet_net_unlock(cpt);
 469         return 0;
 470 }
 471
 472 int
 473 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
 474 {
 475         struct lnet_peer        *gateway;
 476         lnet_remotenet_t        *rnet;
 477         lnet_route_t            *route;
 478         struct list_head                *e1;
 479         struct list_head                *e2;
 480         int                     rc = -ENOENT;
 481         struct list_head                *rn_list;
 482         int                     idx = 0;
 483
 484         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 485                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 486
 487         /* NB Caller may specify either all routes via the given gateway
 488          * or a specific route entry actual NIDs) */
 489
 490         lnet_net_lock(LNET_LOCK_EX);
 491         if (net == LNET_NIDNET(LNET_NID_ANY))
 492                 rn_list = &the_lnet.ln_remote_nets_hash[0];
 493         else
 494                 rn_list = lnet_net2rnethash(net);
 495
 496  again:
 497         list_for_each(e1, rn_list) {
 498                 rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 499
 500                 if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
 501                         net == rnet->lrn_net))
 502                         continue;
 503
 504                 list_for_each(e2, &rnet->lrn_routes) {
 505                         route = list_entry(e2, lnet_route_t, lr_list);
 506
 507                         gateway = route->lr_gateway;
 508                         if (!(gw_nid == LNET_NID_ANY ||
 509                               gw_nid == gateway->lp_nid))
 510                                 continue;
 511
 512                         list_del(&route->lr_list);
 513                         list_del(&route->lr_gwlist);
 514                         the_lnet.ln_remote_nets_version++;
 515
 516                         if (list_empty(&rnet->lrn_routes))
 517                                 list_del(&rnet->lrn_list);
 518                         else
 519                                 rnet = NULL;
 520
 521                         lnet_rtr_decref_locked(gateway);
 522                         lnet_peer_decref_locked(gateway);
 523
 524                         lnet_net_unlock(LNET_LOCK_EX);
 525
 526                         LIBCFS_FREE(route, sizeof(*route));
 527
 528                         if (rnet != NULL)
 529                                 LIBCFS_FREE(rnet, sizeof(*rnet));
 530
 531                         rc = 0;
 532                         lnet_net_lock(LNET_LOCK_EX);
 533                         goto again;
 534                 }
 535         }
 536
 537         if (net == LNET_NIDNET(LNET_NID_ANY) &&
 538             ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
 539                 rn_list = &the_lnet.ln_remote_nets_hash[idx];
 540                 goto again;
 541         }
 542         lnet_net_unlock(LNET_LOCK_EX);
 543
 544         return rc;
 545 }
 546
 547 void
 548 lnet_destroy_routes(void)
 549 {
 550         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 551 }
 552
 553 int
 554 lnet_get_route(int idx, __u32 *net, __u32 *hops,
 555                lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
 556 {
 557         struct list_head                *e1;
 558         struct list_head                *e2;
 559         lnet_remotenet_t        *rnet;
 560         lnet_route_t            *route;
 561         int                     cpt;
 562         int                     i;
 563         struct list_head                *rn_list;
 564
 565         cpt = lnet_net_lock_current();
 566
 567         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 568                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 569                 list_for_each(e1, rn_list) {
 570                         rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
 571
 572                         list_for_each(e2, &rnet->lrn_routes) {
 573                                 route = list_entry(e2, lnet_route_t,
 574                                                        lr_list);
 575
 576                                 if (idx-- == 0) {
 577                                         *net      = rnet->lrn_net;
 578                                         *hops     = route->lr_hops;
 579                                         *priority = route->lr_priority;
 580                                         *gateway  = route->lr_gateway->lp_nid;
 581                                         *alive    = route->lr_gateway->lp_alive;
 582                                         lnet_net_unlock(cpt);
 583                                         return 0;
 584                                 }
 585                         }
 586                 }
 587         }
 588
 589         lnet_net_unlock(cpt);
 590         return -ENOENT;
 591 }
 592
 593 void
 594 lnet_swap_pinginfo(lnet_ping_info_t *info)
 595 {
 596         int            i;
 597         lnet_ni_status_t *stat;
 598
 599         __swab32s(&info->pi_magic);
 600         __swab32s(&info->pi_features);
 601         __swab32s(&info->pi_pid);
 602         __swab32s(&info->pi_nnis);
 603         for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 604                 stat = &info->pi_ni[i];
 605                 __swab64s(&stat->ns_nid);
 606                 __swab32s(&stat->ns_status);
 607         }
 608 }
 609
 610 /**
 611  * parse router-checker pinginfo, record number of down NIs for remote
 612  * networks on that router.
 613  */
 614 static void
 615 lnet_parse_rc_info(lnet_rc_data_t *rcd)
 616 {
 617         lnet_ping_info_t        *info = rcd->rcd_pinginfo;
 618         struct lnet_peer        *gw   = rcd->rcd_gateway;
 619         lnet_route_t            *rtr;
 620
 621         if (!gw->lp_alive)
 622                 return;
 623
 624         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
 625                 lnet_swap_pinginfo(info);
 626
 627         /* NB always racing with network! */
 628         if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
 629                 CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
 630                        libcfs_nid2str(gw->lp_nid), info->pi_magic);
 631                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 632                 return;
 633         }
 634
 635         gw->lp_ping_feats = info->pi_features;
 636         if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) {
 637                 CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
 638                        libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats);
 639                 return; /* nothing I can understand */
 640         }
 641
 642         if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0)
 643                 return; /* can't carry NI status info */
 644
 645         list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) {
 646                 int     ptl_status = LNET_NI_STATUS_INVALID;
 647                 int     down = 0;
 648                 int     up = 0;
 649                 int     i;
 650
 651                 for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
 652                         lnet_ni_status_t *stat = &info->pi_ni[i];
 653                         lnet_nid_t       nid = stat->ns_nid;
 654
 655                         if (nid == LNET_NID_ANY) {
 656                                 CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
 657                                        libcfs_nid2str(gw->lp_nid));
 658                                 gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 659                                 return;
 660                         }
 661
 662                         if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
 663                                 continue;
 664
 665                         if (stat->ns_status == LNET_NI_STATUS_DOWN) {
 666                                 if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND)
 667                                         down++;
 668                                 else if (ptl_status != LNET_NI_STATUS_UP)
 669                                         ptl_status = LNET_NI_STATUS_DOWN;
 670                                 continue;
 671                         }
 672
 673                         if (stat->ns_status == LNET_NI_STATUS_UP) {
 674                                 if (LNET_NIDNET(nid) == rtr->lr_net) {
 675                                         up = 1;
 676                                         break;
 677                                 }
 678                                 /* ptl NIs are considered down only when
 679                                  * they're all down */
 680                                 if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
 681                                         ptl_status = LNET_NI_STATUS_UP;
 682                                 continue;
 683                         }
 684
 685                         CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
 686                                libcfs_nid2str(gw->lp_nid), stat->ns_status);
 687                         gw->lp_ping_feats = LNET_PING_FEAT_INVAL;
 688                         return;
 689                 }
 690
 691                 if (up) { /* ignore downed NIs if NI for dest network is up */
 692                         rtr->lr_downis = 0;
 693                         continue;
 694                 }
 695                 rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN);
 696         }
 697 }
 698
 699 static void
 700 lnet_router_checker_event(lnet_event_t *event)
 701 {
 702         lnet_rc_data_t          *rcd = event->md.user_ptr;
 703         struct lnet_peer        *lp;
 704
 705         LASSERT(rcd != NULL);
 706
 707         if (event->unlinked) {
 708                 LNetInvalidateHandle(&rcd->rcd_mdh);
 709                 return;
 710         }
 711
 712         LASSERT(event->type == LNET_EVENT_SEND ||
 713                 event->type == LNET_EVENT_REPLY);
 714
 715         lp = rcd->rcd_gateway;
 716         LASSERT(lp != NULL);
 717
 718          /* NB: it's called with holding lnet_res_lock, we have a few
 719           * places need to hold both locks at the same time, please take
 720           * care of lock ordering */
 721         lnet_net_lock(lp->lp_cpt);
 722         if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) {
 723                 /* ignore if no longer a router or rcd is replaced */
 724                 goto out;
 725         }
 726
 727         if (event->type == LNET_EVENT_SEND) {
 728                 lp->lp_ping_notsent = 0;
 729                 if (event->status == 0)
 730                         goto out;
 731         }
 732
 733         /* LNET_EVENT_REPLY */
 734         /* A successful REPLY means the router is up.  If _any_ comms
 735          * to the router fail I assume it's down (this will happen if
 736          * we ping alive routers to try to detect router death before
 737          * apps get burned). */
 738
 739         lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
 740         /* The router checker will wake up very shortly and do the
 741          * actual notification.
 742          * XXX If 'lp' stops being a router before then, it will still
 743          * have the notification pending!!! */
 744
 745         if (avoid_asym_router_failure && event->status == 0)
 746                 lnet_parse_rc_info(rcd);
 747
 748  out:
 749         lnet_net_unlock(lp->lp_cpt);
 750 }
 751
 752 static void
 753 lnet_wait_known_routerstate(void)
 754 {
 755         lnet_peer_t      *rtr;
 756         struct list_head          *entry;
 757         int               all_known;
 758
 759         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
 760
 761         for (;;) {
 762                 int     cpt = lnet_net_lock_current();
 763
 764                 all_known = 1;
 765                 list_for_each(entry, &the_lnet.ln_routers) {
 766                         rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
 767
 768                         if (rtr->lp_alive_count == 0) {
 769                                 all_known = 0;
 770                                 break;
 771                         }
 772                 }
 773
 774                 lnet_net_unlock(cpt);
 775
 776                 if (all_known)
 777                         return;
 778
 779                 set_current_state(TASK_UNINTERRUPTIBLE);
 780                 schedule_timeout(cfs_time_seconds(1));
 781         }
 782 }
 783
 784 void
 785 lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
 786 {
 787         lnet_route_t *rte;
 788
 789         if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
 790                 list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
 791                         if (rte->lr_net == net) {
 792                                 rte->lr_downis = 0;
 793                                 break;
 794                         }
 795                 }
 796         }
 797 }
 798
 799 static void
 800 lnet_update_ni_status_locked(void)
 801 {
 802         lnet_ni_t       *ni;
 803         long            now;
 804         int             timeout;
 805
 806         LASSERT(the_lnet.ln_routing);
 807
 808         timeout = router_ping_timeout +
 809                   max(live_router_check_interval, dead_router_check_interval);
 810
 811         now = get_seconds();
 812         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 813                 if (ni->ni_lnd->lnd_type == LOLND)
 814                         continue;
 815
 816                 if (now < ni->ni_last_alive + timeout)
 817                         continue;
 818
 819                 lnet_ni_lock(ni);
 820                 /* re-check with lock */
 821                 if (now < ni->ni_last_alive + timeout) {
 822                         lnet_ni_unlock(ni);
 823                         continue;
 824                 }
 825
 826                 LASSERT(ni->ni_status != NULL);
 827
 828                 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
 829                         CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
 830                                libcfs_nid2str(ni->ni_nid), timeout);
 831                         /* NB: so far, this is the only place to set
 832                          * NI status to "down" */
 833                         ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
 834                 }
 835                 lnet_ni_unlock(ni);
 836         }
 837 }
 838
 839 static void
 840 lnet_destroy_rc_data(lnet_rc_data_t *rcd)
 841 {
 842         LASSERT(list_empty(&rcd->rcd_list));
 843         /* detached from network */
 844         LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
 845
 846         if (rcd->rcd_gateway != NULL) {
 847                 int cpt = rcd->rcd_gateway->lp_cpt;
 848
 849                 lnet_net_lock(cpt);
 850                 lnet_peer_decref_locked(rcd->rcd_gateway);
 851                 lnet_net_unlock(cpt);
 852         }
 853
 854         if (rcd->rcd_pinginfo != NULL)
 855                 LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
 856
 857         LIBCFS_FREE(rcd, sizeof(*rcd));
 858 }
 859
 860 static lnet_rc_data_t *
 861 lnet_create_rc_data_locked(lnet_peer_t *gateway)
 862 {
 863         lnet_rc_data_t          *rcd = NULL;
 864         lnet_ping_info_t        *pi;
 865         int                     rc;
 866         int                     i;
 867
 868         lnet_net_unlock(gateway->lp_cpt);
 869
 870         LIBCFS_ALLOC(rcd, sizeof(*rcd));
 871         if (rcd == NULL)
 872                 goto out;
 873
 874         LNetInvalidateHandle(&rcd->rcd_mdh);
 875         INIT_LIST_HEAD(&rcd->rcd_list);
 876
 877         LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
 878         if (pi == NULL)
 879                 goto out;
 880
 881         for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
 882                 pi->pi_ni[i].ns_nid = LNET_NID_ANY;
 883                 pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
 884         }
 885         rcd->rcd_pinginfo = pi;
 886
 887         LASSERT(!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
 888         rc = LNetMDBind((lnet_md_t){.start     = pi,
 889                                     .user_ptr  = rcd,
 890                                     .length    = LNET_PINGINFO_SIZE,
 891                                     .threshold = LNET_MD_THRESH_INF,
 892                                     .options   = LNET_MD_TRUNCATE,
 893                                     .eq_handle = the_lnet.ln_rc_eqh},
 894                         LNET_UNLINK,
 895                         &rcd->rcd_mdh);
 896         if (rc < 0) {
 897                 CERROR("Can't bind MD: %d\n", rc);
 898                 goto out;
 899         }
 900         LASSERT(rc == 0);
 901
 902         lnet_net_lock(gateway->lp_cpt);
 903         /* router table changed or someone has created rcd for this gateway */
 904         if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) {
 905                 lnet_net_unlock(gateway->lp_cpt);
 906                 goto out;
 907         }
 908
 909         lnet_peer_addref_locked(gateway);
 910         rcd->rcd_gateway = gateway;
 911         gateway->lp_rcd = rcd;
 912         gateway->lp_ping_notsent = 0;
 913
 914         return rcd;
 915
 916  out:
 917         if (rcd != NULL) {
 918                 if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
 919                         rc = LNetMDUnlink(rcd->rcd_mdh);
 920                         LASSERT(rc == 0);
 921                 }
 922                 lnet_destroy_rc_data(rcd);
 923         }
 924
 925         lnet_net_lock(gateway->lp_cpt);
 926         return gateway->lp_rcd;
 927 }
 928
 929 static int
 930 lnet_router_check_interval(lnet_peer_t *rtr)
 931 {
 932         int secs;
 933
 934         secs = rtr->lp_alive ? live_router_check_interval :
 935                                dead_router_check_interval;
 936         if (secs < 0)
 937                 secs = 0;
 938
 939         return secs;
 940 }
 941
 942 static void
 943 lnet_ping_router_locked(lnet_peer_t *rtr)
 944 {
 945         lnet_rc_data_t *rcd = NULL;
 946         unsigned long      now = cfs_time_current();
 947         int          secs;
 948
 949         lnet_peer_addref_locked(rtr);
 950
 951         if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
 952             cfs_time_after(now, rtr->lp_ping_deadline))
 953                 lnet_notify_locked(rtr, 1, 0, now);
 954
 955         /* Run any outstanding notifications */
 956         lnet_ni_notify_locked(rtr->lp_ni, rtr);
 957
 958         if (!lnet_isrouter(rtr) ||
 959             the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
 960                 /* router table changed or router checker is shutting down */
 961                 lnet_peer_decref_locked(rtr);
 962                 return;
 963         }
 964
 965         rcd = rtr->lp_rcd != NULL ?
 966               rtr->lp_rcd : lnet_create_rc_data_locked(rtr);
 967
 968         if (rcd == NULL)
 969                 return;
 970
 971         secs = lnet_router_check_interval(rtr);
 972
 973         CDEBUG(D_NET,
 974                "rtr %s %d: deadline %lu ping_notsent %d alive %d alive_count %d lp_ping_timestamp %lu\n",
 975                libcfs_nid2str(rtr->lp_nid), secs,
 976                rtr->lp_ping_deadline, rtr->lp_ping_notsent,
 977                rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
 978
 979         if (secs != 0 && !rtr->lp_ping_notsent &&
 980             cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
 981                                              cfs_time_seconds(secs)))) {
 982                 int            rc;
 983                 lnet_process_id_t id;
 984                 lnet_handle_md_t  mdh;
 985
 986                 id.nid = rtr->lp_nid;
 987                 id.pid = LUSTRE_SRV_LNET_PID;
 988                 CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
 989
 990                 rtr->lp_ping_notsent   = 1;
 991                 rtr->lp_ping_timestamp = now;
 992
 993                 mdh = rcd->rcd_mdh;
 994
 995                 if (rtr->lp_ping_deadline == 0) {
 996                         rtr->lp_ping_deadline =
 997                                 cfs_time_shift(router_ping_timeout);
 998                 }
 999
1000                 lnet_net_unlock(rtr->lp_cpt);
1001
1002                 rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
1003                              LNET_PROTO_PING_MATCHBITS, 0);
1004
1005                 lnet_net_lock(rtr->lp_cpt);
1006                 if (rc != 0)
1007                         rtr->lp_ping_notsent = 0; /* no event pending */
1008         }
1009
1010         lnet_peer_decref_locked(rtr);
1011 }
1012
1013 int
1014 lnet_router_checker_start(void)
1015 {
1016         int       rc;
1017         int       eqsz;
1018
1019         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1020
1021         if (check_routers_before_use &&
1022             dead_router_check_interval <= 0) {
1023                 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be set if 'check_routers_before_use' is set\n");
1024                 return -EINVAL;
1025         }
1026
1027         if (!the_lnet.ln_routing &&
1028             live_router_check_interval <= 0 &&
1029             dead_router_check_interval <= 0)
1030                 return 0;
1031
1032         sema_init(&the_lnet.ln_rc_signal, 0);
1033         /* EQ size doesn't matter; the callback is guaranteed to get every
1034          * event */
1035         eqsz = 0;
1036         rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
1037                          &the_lnet.ln_rc_eqh);
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         rc = PTR_ERR(kthread_run(lnet_router_checker,
1045                                  NULL, "router_checker"));
1046         if (IS_ERR_VALUE(rc)) {
1047                 CERROR("Can't start router checker thread: %d\n", rc);
1048                 /* block until event callback signals exit */
1049                 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
1056         if (check_routers_before_use) {
1057                 /* Note that a helpful side-effect of pinging all known routers
1058                  * at startup is that it makes them drop stale connections they
1059                  * may have to a previous instance of me. */
1060                 lnet_wait_known_routerstate();
1061         }
1062
1063         return 0;
1064 }
1065
1066 void
1067 lnet_router_checker_stop(void)
1068 {
1069         int rc;
1070
1071         if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
1072                 return;
1073
1074         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1075         the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
1076
1077         /* block until event callback signals exit */
1078         down(&the_lnet.ln_rc_signal);
1079         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
1080
1081         rc = LNetEQFree(the_lnet.ln_rc_eqh);
1082         LASSERT(rc == 0);
1083 }
1084
1085 static void
1086 lnet_prune_rc_data(int wait_unlink)
1087 {
1088         lnet_rc_data_t          *rcd;
1089         lnet_rc_data_t          *tmp;
1090         lnet_peer_t             *lp;
1091         struct list_head                head;
1092         int                     i = 2;
1093
1094         if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
1095                    list_empty(&the_lnet.ln_rcd_deathrow) &&
1096                    list_empty(&the_lnet.ln_rcd_zombie)))
1097                 return;
1098
1099         INIT_LIST_HEAD(&head);
1100
1101         lnet_net_lock(LNET_LOCK_EX);
1102
1103         if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
1104                 /* router checker is stopping, prune all */
1105                 list_for_each_entry(lp, &the_lnet.ln_routers,
1106                                         lp_rtr_list) {
1107                         if (lp->lp_rcd == NULL)
1108                                 continue;
1109
1110                         LASSERT(list_empty(&lp->lp_rcd->rcd_list));
1111                         list_add(&lp->lp_rcd->rcd_list,
1112                                      &the_lnet.ln_rcd_deathrow);
1113                         lp->lp_rcd = NULL;
1114                 }
1115         }
1116
1117         /* unlink all RCDs on deathrow list */
1118         list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
1119
1120         if (!list_empty(&head)) {
1121                 lnet_net_unlock(LNET_LOCK_EX);
1122
1123                 list_for_each_entry(rcd, &head, rcd_list)
1124                         LNetMDUnlink(rcd->rcd_mdh);
1125
1126                 lnet_net_lock(LNET_LOCK_EX);
1127         }
1128
1129         list_splice_init(&head, &the_lnet.ln_rcd_zombie);
1130
1131         /* release all zombie RCDs */
1132         while (!list_empty(&the_lnet.ln_rcd_zombie)) {
1133                 list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
1134                                              rcd_list) {
1135                         if (LNetHandleIsInvalid(rcd->rcd_mdh))
1136                                 list_move(&rcd->rcd_list, &head);
1137                 }
1138
1139                 wait_unlink = wait_unlink &&
1140                               !list_empty(&the_lnet.ln_rcd_zombie);
1141
1142                 lnet_net_unlock(LNET_LOCK_EX);
1143
1144                 while (!list_empty(&head)) {
1145                         rcd = list_entry(head.next,
1146                                              lnet_rc_data_t, rcd_list);
1147                         list_del_init(&rcd->rcd_list);
1148                         lnet_destroy_rc_data(rcd);
1149                 }
1150
1151                 if (!wait_unlink)
1152                         return;
1153
1154                 i++;
1155                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1156                        "Waiting for rc buffers to unlink\n");
1157                 set_current_state(TASK_UNINTERRUPTIBLE);
1158                 schedule_timeout(cfs_time_seconds(1) / 4);
1159
1160                 lnet_net_lock(LNET_LOCK_EX);
1161         }
1162
1163         lnet_net_unlock(LNET_LOCK_EX);
1164 }
1165
1166
1167 #if  defined(LNET_ROUTER)
1168
1169 static int
1170 lnet_router_checker(void *arg)
1171 {
1172         lnet_peer_t       *rtr;
1173         struct list_head        *entry;
1174
1175         cfs_block_allsigs();
1176
1177         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1178
1179         while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
1180                 __u64   version;
1181                 int     cpt;
1182                 int     cpt2;
1183
1184                 cpt = lnet_net_lock_current();
1185 rescan:
1186                 version = the_lnet.ln_routers_version;
1187
1188                 list_for_each(entry, &the_lnet.ln_routers) {
1189                         rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
1190
1191                         cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid);
1192                         if (cpt != cpt2) {
1193                                 lnet_net_unlock(cpt);
1194                                 cpt = cpt2;
1195                                 lnet_net_lock(cpt);
1196                                 /* the routers list has changed */
1197                                 if (version != the_lnet.ln_routers_version)
1198                                         goto rescan;
1199                         }
1200
1201                         lnet_ping_router_locked(rtr);
1202
1203                         /* NB dropped lock */
1204                         if (version != the_lnet.ln_routers_version) {
1205                                 /* the routers list has changed */
1206                                 goto rescan;
1207                         }
1208                 }
1209
1210                 if (the_lnet.ln_routing)
1211                         lnet_update_ni_status_locked();
1212
1213                 lnet_net_unlock(cpt);
1214
1215                 lnet_prune_rc_data(0); /* don't wait for UNLINK */
1216
1217                 /* Call schedule_timeout() here always adds 1 to load average
1218                  * because kernel counts # active tasks as nr_running
1219                  * + nr_uninterruptible. */
1220                 set_current_state(TASK_INTERRUPTIBLE);
1221                 schedule_timeout(cfs_time_seconds(1));
1222         }
1223
1224         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING);
1225
1226         lnet_prune_rc_data(1); /* wait for UNLINK */
1227
1228         the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1229         up(&the_lnet.ln_rc_signal);
1230         /* The unlink event callback will signal final completion */
1231         return 0;
1232 }
1233
1234 static void
1235 lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
1236 {
1237         int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1238
1239         while (--npages >= 0)
1240                 __free_page(rb->rb_kiov[npages].kiov_page);
1241
1242         LIBCFS_FREE(rb, sz);
1243 }
1244
1245 static lnet_rtrbuf_t *
1246 lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
1247 {
1248         int         npages = rbp->rbp_npages;
1249         int         sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
1250         struct page   *page;
1251         lnet_rtrbuf_t *rb;
1252         int         i;
1253
1254         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1255         if (rb == NULL)
1256                 return NULL;
1257
1258         rb->rb_pool = rbp;
1259
1260         for (i = 0; i < npages; i++) {
1261                 page = alloc_pages_node(
1262                                 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1263                                 __GFP_ZERO | GFP_IOFS, 0);
1264                 if (page == NULL) {
1265                         while (--i >= 0)
1266                                 __free_page(rb->rb_kiov[i].kiov_page);
1267
1268                         LIBCFS_FREE(rb, sz);
1269                         return NULL;
1270                 }
1271
1272                 rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE;
1273                 rb->rb_kiov[i].kiov_offset = 0;
1274                 rb->rb_kiov[i].kiov_page = page;
1275         }
1276
1277         return rb;
1278 }
1279
1280 static void
1281 lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
1282 {
1283         int             npages = rbp->rbp_npages;
1284         int             nbuffers = 0;
1285         lnet_rtrbuf_t   *rb;
1286
1287         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1288                 return;
1289
1290         LASSERT(list_empty(&rbp->rbp_msgs));
1291         LASSERT(rbp->rbp_credits == rbp->rbp_nbuffers);
1292
1293         while (!list_empty(&rbp->rbp_bufs)) {
1294                 LASSERT(rbp->rbp_credits > 0);
1295
1296                 rb = list_entry(rbp->rbp_bufs.next,
1297                                     lnet_rtrbuf_t, rb_list);
1298                 list_del(&rb->rb_list);
1299                 lnet_destroy_rtrbuf(rb, npages);
1300                 nbuffers++;
1301         }
1302
1303         LASSERT(rbp->rbp_nbuffers == nbuffers);
1304         LASSERT(rbp->rbp_credits == nbuffers);
1305
1306         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1307 }
1308
1309 static int
1310 lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
1311 {
1312         lnet_rtrbuf_t *rb;
1313         int         i;
1314
1315         if (rbp->rbp_nbuffers != 0) {
1316                 LASSERT(rbp->rbp_nbuffers == nbufs);
1317                 return 0;
1318         }
1319
1320         for (i = 0; i < nbufs; i++) {
1321                 rb = lnet_new_rtrbuf(rbp, cpt);
1322
1323                 if (rb == NULL) {
1324                         CERROR("Failed to allocate %d router bufs of %d pages\n",
1325                                nbufs, rbp->rbp_npages);
1326                         return -ENOMEM;
1327                 }
1328
1329                 rbp->rbp_nbuffers++;
1330                 rbp->rbp_credits++;
1331                 rbp->rbp_mincredits++;
1332                 list_add(&rb->rb_list, &rbp->rbp_bufs);
1333
1334                 /* No allocation "under fire" */
1335                 /* Otherwise we'd need code to schedule blocked msgs etc */
1336                 LASSERT(!the_lnet.ln_routing);
1337         }
1338
1339         LASSERT(rbp->rbp_credits == nbufs);
1340         return 0;
1341 }
1342
1343 static void
1344 lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
1345 {
1346         INIT_LIST_HEAD(&rbp->rbp_msgs);
1347         INIT_LIST_HEAD(&rbp->rbp_bufs);
1348
1349         rbp->rbp_npages = npages;
1350         rbp->rbp_credits = 0;
1351         rbp->rbp_mincredits = 0;
1352 }
1353
1354 void
1355 lnet_rtrpools_free(void)
1356 {
1357         lnet_rtrbufpool_t *rtrp;
1358         int               i;
1359
1360         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1361                 return;
1362
1363         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1364                 lnet_rtrpool_free_bufs(&rtrp[0]);
1365                 lnet_rtrpool_free_bufs(&rtrp[1]);
1366                 lnet_rtrpool_free_bufs(&rtrp[2]);
1367         }
1368
1369         cfs_percpt_free(the_lnet.ln_rtrpools);
1370         the_lnet.ln_rtrpools = NULL;
1371 }
1372
1373 static int
1374 lnet_nrb_tiny_calculate(int npages)
1375 {
1376         int     nrbs = LNET_NRB_TINY;
1377
1378         if (tiny_router_buffers < 0) {
1379                 LCONSOLE_ERROR_MSG(0x10c,
1380                                    "tiny_router_buffers=%d invalid when routing enabled\n",
1381                                    tiny_router_buffers);
1382                 return -1;
1383         }
1384
1385         if (tiny_router_buffers > 0)
1386                 nrbs = tiny_router_buffers;
1387
1388         nrbs /= LNET_CPT_NUMBER;
1389         return max(nrbs, LNET_NRB_TINY_MIN);
1390 }
1391
1392 static int
1393 lnet_nrb_small_calculate(int npages)
1394 {
1395         int     nrbs = LNET_NRB_SMALL;
1396
1397         if (small_router_buffers < 0) {
1398                 LCONSOLE_ERROR_MSG(0x10c,
1399                                    "small_router_buffers=%d invalid when routing enabled\n",
1400                                    small_router_buffers);
1401                 return -1;
1402         }
1403
1404         if (small_router_buffers > 0)
1405                 nrbs = small_router_buffers;
1406
1407         nrbs /= LNET_CPT_NUMBER;
1408         return max(nrbs, LNET_NRB_SMALL_MIN);
1409 }
1410
1411 static int
1412 lnet_nrb_large_calculate(int npages)
1413 {
1414         int     nrbs = LNET_NRB_LARGE;
1415
1416         if (large_router_buffers < 0) {
1417                 LCONSOLE_ERROR_MSG(0x10c,
1418                                    "large_router_buffers=%d invalid when routing enabled\n",
1419                                    large_router_buffers);
1420                 return -1;
1421         }
1422
1423         if (large_router_buffers > 0)
1424                 nrbs = large_router_buffers;
1425
1426         nrbs /= LNET_CPT_NUMBER;
1427         return max(nrbs, LNET_NRB_LARGE_MIN);
1428 }
1429
1430 int
1431 lnet_rtrpools_alloc(int im_a_router)
1432 {
1433         lnet_rtrbufpool_t *rtrp;
1434         int     large_pages;
1435         int     small_pages = 1;
1436         int     nrb_tiny;
1437         int     nrb_small;
1438         int     nrb_large;
1439         int     rc;
1440         int     i;
1441
1442         large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1443
1444         if (!strcmp(forwarding, "")) {
1445                 /* not set either way */
1446                 if (!im_a_router)
1447                         return 0;
1448         } else if (!strcmp(forwarding, "disabled")) {
1449                 /* explicitly disabled */
1450                 return 0;
1451         } else if (!strcmp(forwarding, "enabled")) {
1452                 /* explicitly enabled */
1453         } else {
1454                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either 'enabled' or 'disabled'\n");
1455                 return -EINVAL;
1456         }
1457
1458         nrb_tiny = lnet_nrb_tiny_calculate(0);
1459         if (nrb_tiny < 0)
1460                 return -EINVAL;
1461
1462         nrb_small = lnet_nrb_small_calculate(small_pages);
1463         if (nrb_small < 0)
1464                 return -EINVAL;
1465
1466         nrb_large = lnet_nrb_large_calculate(large_pages);
1467         if (nrb_large < 0)
1468                 return -EINVAL;
1469
1470         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1471                                                 LNET_NRBPOOLS *
1472                                                 sizeof(lnet_rtrbufpool_t));
1473         if (the_lnet.ln_rtrpools == NULL) {
1474                 LCONSOLE_ERROR_MSG(0x10c,
1475                                    "Failed to initialize router buffe pool\n");
1476                 return -ENOMEM;
1477         }
1478
1479         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1480                 lnet_rtrpool_init(&rtrp[0], 0);
1481                 rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i);
1482                 if (rc != 0)
1483                         goto failed;
1484
1485                 lnet_rtrpool_init(&rtrp[1], small_pages);
1486                 rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i);
1487                 if (rc != 0)
1488                         goto failed;
1489
1490                 lnet_rtrpool_init(&rtrp[2], large_pages);
1491                 rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i);
1492                 if (rc != 0)
1493                         goto failed;
1494         }
1495
1496         lnet_net_lock(LNET_LOCK_EX);
1497         the_lnet.ln_routing = 1;
1498         lnet_net_unlock(LNET_LOCK_EX);
1499
1500         return 0;
1501
1502  failed:
1503         lnet_rtrpools_free();
1504         return rc;
1505 }
1506
1507 int
1508 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1509 {
1510         struct lnet_peer        *lp = NULL;
1511         unsigned long           now = cfs_time_current();
1512         int                     cpt = lnet_cpt_of_nid(nid);
1513
1514         LASSERT(!in_interrupt ());
1515
1516         CDEBUG(D_NET, "%s notifying %s: %s\n",
1517                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1518                 libcfs_nid2str(nid),
1519                 alive ? "up" : "down");
1520
1521         if (ni != NULL &&
1522             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1523                 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1524                         libcfs_nid2str(nid), alive ? "birth" : "death",
1525                         libcfs_nid2str(ni->ni_nid));
1526                 return -EINVAL;
1527         }
1528
1529         /* can't do predictions... */
1530         if (cfs_time_after(when, now)) {
1531                 CWARN("Ignoring prediction from %s of %s %s %ld seconds in the future\n",
1532                       (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1533                       libcfs_nid2str(nid), alive ? "up" : "down",
1534                       cfs_duration_sec(cfs_time_sub(when, now)));
1535                 return -EINVAL;
1536         }
1537
1538         if (ni != NULL && !alive &&          /* LND telling me she's down */
1539             !auto_down) {                      /* auto-down disabled */
1540                 CDEBUG(D_NET, "Auto-down disabled\n");
1541                 return 0;
1542         }
1543
1544         lnet_net_lock(cpt);
1545
1546         if (the_lnet.ln_shutdown) {
1547                 lnet_net_unlock(cpt);
1548                 return -ESHUTDOWN;
1549         }
1550
1551         lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid);
1552         if (lp == NULL) {
1553                 /* nid not found */
1554                 lnet_net_unlock(cpt);
1555                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1556                 return 0;
1557         }
1558
1559         /* We can't fully trust LND on reporting exact peer last_alive
1560          * if he notifies us about dead peer. For example ksocklnd can
1561          * call us with when == _time_when_the_node_was_booted_ if
1562          * no connections were successfully established */
1563         if (ni != NULL && !alive && when < lp->lp_last_alive)
1564                 when = lp->lp_last_alive;
1565
1566         lnet_notify_locked(lp, ni == NULL, alive, when);
1567
1568         lnet_ni_notify_locked(ni, lp);
1569
1570         lnet_peer_decref_locked(lp);
1571
1572         lnet_net_unlock(cpt);
1573         return 0;
1574 }
1575 EXPORT_SYMBOL(lnet_notify);
1576
1577 void
1578 lnet_get_tunables(void)
1579 {
1580 }
1581
1582 #else
1583
1584 int
1585 lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
1586 {
1587         return -EOPNOTSUPP;
1588 }
1589
1590 void
1591 lnet_router_checker(void)
1592 {
1593         static time_t last;
1594         static int    running;
1595
1596         time_t      now = get_seconds();
1597         int            interval = now - last;
1598         int            rc;
1599         __u64        version;
1600         lnet_peer_t      *rtr;
1601
1602         /* It's no use to call me again within a sec - all intervals and
1603          * timeouts are measured in seconds */
1604         if (last != 0 && interval < 2)
1605                 return;
1606
1607         if (last != 0 &&
1608             interval > max(live_router_check_interval,
1609                            dead_router_check_interval))
1610                 CNETERR("Checker(%d/%d) not called for %d seconds\n",
1611                         live_router_check_interval, dead_router_check_interval,
1612                         interval);
1613
1614         LASSERT(LNET_CPT_NUMBER == 1);
1615
1616         lnet_net_lock(0);
1617         LASSERT(!running); /* recursion check */
1618         running = 1;
1619         lnet_net_unlock(0);
1620
1621         last = now;
1622
1623         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING)
1624                 lnet_prune_rc_data(0); /* unlink all rcd and nowait */
1625
1626         /* consume all pending events */
1627         while (1) {
1628                 int       i;
1629                 lnet_event_t ev;
1630
1631                 /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
1632                  * recursion breaker in LNetEQPoll would fail */
1633                 rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
1634                 if (rc == 0)   /* no event pending */
1635                         break;
1636
1637                 /* NB a lost SENT prevents me from pinging a router again */
1638                 if (rc == -EOVERFLOW) {
1639                         CERROR("Dropped an event!!!\n");
1640                         abort();
1641                 }
1642
1643                 LASSERT(rc == 1);
1644
1645                 lnet_router_checker_event(&ev);
1646         }
1647
1648         if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) {
1649                 lnet_prune_rc_data(1); /* release rcd */
1650                 the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
1651                 running = 0;
1652                 return;
1653         }
1654
1655         LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
1656
1657         lnet_net_lock(0);
1658
1659         version = the_lnet.ln_routers_version;
1660         list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
1661                 lnet_ping_router_locked(rtr);
1662                 LASSERT(version == the_lnet.ln_routers_version);
1663         }
1664
1665         lnet_net_unlock(0);
1666
1667         running = 0; /* lock only needed for the recursion check */
1668 }
1669
1670 /* NB lnet_peers_start_down depends on me,
1671  * so must be called before any peer creation */
1672 void
1673 lnet_get_tunables(void)
1674 {
1675         char *s;
1676
1677         s = getenv("LNET_ROUTER_PING_TIMEOUT");
1678         if (s != NULL)
1679                 router_ping_timeout = atoi(s);
1680
1681         s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
1682         if (s != NULL)
1683                 live_router_check_interval = atoi(s);
1684
1685         s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
1686         if (s != NULL)
1687                 dead_router_check_interval = atoi(s);
1688
1689         /* This replaces old lnd_notify mechanism */
1690         check_routers_before_use = 1;
1691         if (dead_router_check_interval <= 0)
1692                 dead_router_check_interval = 30;
1693 }
1694
1695 void
1696 lnet_rtrpools_free(void)
1697 {
1698 }
1699
1700 int
1701 lnet_rtrpools_alloc(int im_a_arouter)
1702 {
1703         return 0;
1704 }
1705
1706 #endif