lnet/lnet/router.c

   1 /*
   2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Copyright (c) 2011, 2017, Intel Corporation.
   5  *
   6  *   This file is part of Lustre, https://wiki.whamcloud.com/
   7  *
   8  *   Portals is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Portals is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Portals; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_LNET
  24
  25 #include <linux/random.h>
  26 #include <lnet/lib-lnet.h>
  27
  28 #define LNET_NRB_TINY_MIN       512     /* min value for each CPT */
  29 #define LNET_NRB_TINY           (LNET_NRB_TINY_MIN * 4)
  30 #define LNET_NRB_SMALL_MIN      4096    /* min value for each CPT */
  31 #define LNET_NRB_SMALL          (LNET_NRB_SMALL_MIN * 4)
  32 #define LNET_NRB_SMALL_PAGES    1
  33 #define LNET_NRB_LARGE_MIN      256     /* min value for each CPT */
  34 #define LNET_NRB_LARGE          (LNET_NRB_LARGE_MIN * 4)
  35 #define LNET_NRB_LARGE_PAGES    ((LNET_MTU + PAGE_SIZE - 1) >> \
  36                                   PAGE_SHIFT)
  37
  38 static char *forwarding = "";
  39 module_param(forwarding, charp, 0444);
  40 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
  41
  42 static int tiny_router_buffers;
  43 module_param(tiny_router_buffers, int, 0444);
  44 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
  45 static int small_router_buffers;
  46 module_param(small_router_buffers, int, 0444);
  47 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
  48 static int large_router_buffers;
  49 module_param(large_router_buffers, int, 0444);
  50 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
  51 static int peer_buffer_credits;
  52 module_param(peer_buffer_credits, int, 0444);
  53 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
  54
  55 static int auto_down = 1;
  56 module_param(auto_down, int, 0444);
  57 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
  58
  59 int
  60 lnet_peer_buffer_credits(struct lnet_net *net)
  61 {
  62         /* NI option overrides LNet default */
  63         if (net->net_tunables.lct_peer_rtr_credits > 0)
  64                 return net->net_tunables.lct_peer_rtr_credits;
  65         if (peer_buffer_credits > 0)
  66                 return peer_buffer_credits;
  67
  68         /* As an approximation, allow this peer the same number of router
  69          * buffers as it is allowed outstanding sends */
  70         return net->net_tunables.lct_peer_tx_credits;
  71 }
  72
  73 static int check_routers_before_use;
  74 module_param(check_routers_before_use, int, 0444);
  75 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
  76
  77 int avoid_asym_router_failure = 1;
  78 module_param(avoid_asym_router_failure, int, 0644);
  79 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
  80
  81 static int dead_router_check_interval = 60;
  82 module_param(dead_router_check_interval, int, 0644);
  83 MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
  84
  85 static int live_router_check_interval = 60;
  86 module_param(live_router_check_interval, int, 0644);
  87 MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
  88
  89 static int router_ping_timeout = 50;
  90 module_param(router_ping_timeout, int, 0644);
  91 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
  92
  93 /*
  94  * A value between 0 and 100. 0 meaning that even if router's interfaces
  95  * have the worse health still consider the gateway usable.
  96  * 100 means that at least one interface on the route's remote net is 100%
  97  * healthy to consider the route alive.
  98  * The default is set to 100 to ensure we maintain the original behavior.
  99  */
 100 unsigned int router_sensitivity_percentage = 100;
 101 static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
 102 static struct kernel_param_ops param_ops_rtr_sensitivity = {
 103         .set = rtr_sensitivity_set,
 104         .get = param_get_int,
 105 };
 106 #define param_check_rtr_sensitivity(name, p) \
 107                 __param_check(name, p, int)
 108 #ifdef HAVE_KERNEL_PARAM_OPS
 109 module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR);
 110 #else
 111 module_param_call(router_sensitivity_percentage, rtr_sensitivity_set, param_get_int,
 112                   &router_sensitivity_percentage, S_IRUGO|S_IWUSR);
 113 #endif
 114 MODULE_PARM_DESC(router_sensitivity_percentage,
 115                 "How healthy a gateway should be to be used in percent");
 116
 117 static int
 118 rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
 119 {
 120         int rc;
 121         unsigned *sen = (unsigned *)kp->arg;
 122         unsigned long value;
 123
 124         rc = kstrtoul(val, 0, &value);
 125         if (rc) {
 126                 CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
 127                 return rc;
 128         }
 129
 130         if (value < 0 || value > 100) {
 131                 CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
 132                 return -EINVAL;
 133         }
 134
 135         /*
 136          * The purpose of locking the api_mutex here is to ensure that
 137          * the correct value ends up stored properly.
 138          */
 139         mutex_lock(&the_lnet.ln_api_mutex);
 140
 141         *sen = value;
 142
 143         mutex_unlock(&the_lnet.ln_api_mutex);
 144
 145         return 0;
 146 }
 147
 148 int
 149 lnet_peers_start_down(void)
 150 {
 151         return check_routers_before_use;
 152 }
 153
 154 void
 155 lnet_notify_locked(struct lnet_peer_ni *lp, int notifylnd, int alive,
 156                    time64_t when)
 157 {
 158         if (lp->lpni_timestamp > when) { /* out of date information */
 159                 CDEBUG(D_NET, "Out of date\n");
 160                 return;
 161         }
 162
 163         /*
 164          * This function can be called with different cpt locks being
 165          * held. lpni_alive_count modification needs to be properly protected.
 166          * Significant reads to lpni_alive_count are also protected with
 167          * the same lock
 168          */
 169         spin_lock(&lp->lpni_lock);
 170
 171         lp->lpni_timestamp = when; /* update timestamp */
 172
 173         if (lp->lpni_alive_count != 0 &&          /* got old news */
 174             (!lp->lpni_alive) == (!alive)) {      /* new date for old news */
 175                 spin_unlock(&lp->lpni_lock);
 176                 CDEBUG(D_NET, "Old news\n");
 177                 return;
 178         }
 179
 180         /* Flag that notification is outstanding */
 181
 182         lp->lpni_alive_count++;
 183         lp->lpni_alive = (alive) ? 1 : 0;
 184         lp->lpni_notify = 1;
 185         lp->lpni_notifylnd = notifylnd;
 186         if (lp->lpni_alive)
 187                 lp->lpni_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
 188
 189         spin_unlock(&lp->lpni_lock);
 190
 191         CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lpni_nid), alive);
 192 }
 193
 194 /*
 195  * This function will always be called with lp->lpni_cpt lock held.
 196  */
 197 static void
 198 lnet_ni_notify_locked(struct lnet_ni *ni, struct lnet_peer_ni *lp)
 199 {
 200         int alive;
 201         int notifylnd;
 202
 203         /* Notify only in 1 thread at any time to ensure ordered notification.
 204          * NB individual events can be missed; the only guarantee is that you
 205          * always get the most recent news */
 206
 207         spin_lock(&lp->lpni_lock);
 208
 209         if (lp->lpni_notifying || ni == NULL) {
 210                 spin_unlock(&lp->lpni_lock);
 211                 return;
 212         }
 213
 214         lp->lpni_notifying = 1;
 215
 216         /*
 217          * lp->lpni_notify needs to be protected because it can be set in
 218          * lnet_notify_locked().
 219          */
 220         while (lp->lpni_notify) {
 221                 alive     = lp->lpni_alive;
 222                 notifylnd = lp->lpni_notifylnd;
 223
 224                 lp->lpni_notifylnd = 0;
 225                 lp->lpni_notify    = 0;
 226
 227                 if (notifylnd && ni->ni_net->net_lnd->lnd_notify != NULL) {
 228                         spin_unlock(&lp->lpni_lock);
 229                         lnet_net_unlock(lp->lpni_cpt);
 230
 231                         /* A new notification could happen now; I'll handle it
 232                          * when control returns to me */
 233
 234                         (ni->ni_net->net_lnd->lnd_notify)(ni, lp->lpni_nid,
 235                                                           alive);
 236
 237                         lnet_net_lock(lp->lpni_cpt);
 238                         spin_lock(&lp->lpni_lock);
 239                 }
 240         }
 241
 242         lp->lpni_notifying = 0;
 243         spin_unlock(&lp->lpni_lock);
 244 }
 245
 246 static void
 247 lnet_rtr_addref_locked(struct lnet_peer *lp)
 248 {
 249         LASSERT(lp->lp_rtr_refcount >= 0);
 250
 251         /* lnet_net_lock must be exclusively locked */
 252         lp->lp_rtr_refcount++;
 253         if (lp->lp_rtr_refcount == 1) {
 254                 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
 255                 /* addref for the_lnet.ln_routers */
 256                 lnet_peer_addref_locked(lp);
 257                 the_lnet.ln_routers_version++;
 258         }
 259 }
 260
 261 static void
 262 lnet_rtr_decref_locked(struct lnet_peer *lp)
 263 {
 264         LASSERT(atomic_read(&lp->lp_refcount) > 0);
 265         LASSERT(lp->lp_rtr_refcount > 0);
 266
 267         /* lnet_net_lock must be exclusively locked */
 268         lp->lp_rtr_refcount--;
 269         if (lp->lp_rtr_refcount == 0) {
 270                 LASSERT(list_empty(&lp->lp_routes));
 271
 272                 list_del(&lp->lp_rtr_list);
 273                 /* decref for the_lnet.ln_routers */
 274                 lnet_peer_decref_locked(lp);
 275                 the_lnet.ln_routers_version++;
 276         }
 277 }
 278
 279 struct lnet_remotenet *
 280 lnet_find_rnet_locked(__u32 net)
 281 {
 282         struct lnet_remotenet *rnet;
 283         struct list_head *tmp;
 284         struct list_head *rn_list;
 285
 286         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
 287
 288         rn_list = lnet_net2rnethash(net);
 289         list_for_each(tmp, rn_list) {
 290                 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
 291
 292                 if (rnet->lrn_net == net)
 293                         return rnet;
 294         }
 295         return NULL;
 296 }
 297
 298 static void lnet_shuffle_seed(void)
 299 {
 300         static int seeded;
 301         struct lnet_ni *ni = NULL;
 302
 303         if (seeded)
 304                 return;
 305
 306         /* Nodes with small feet have little entropy
 307          * the NID for this node gives the most entropy in the low bits */
 308         while ((ni = lnet_get_next_ni_locked(NULL, ni)))
 309                 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
 310
 311         seeded = 1;
 312         return;
 313 }
 314
 315 /* NB expects LNET_LOCK held */
 316 static void
 317 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
 318 {
 319         unsigned int len = 0;
 320         unsigned int offset = 0;
 321         struct list_head *e;
 322
 323         lnet_shuffle_seed();
 324
 325         list_for_each(e, &rnet->lrn_routes)
 326                 len++;
 327
 328         /*
 329          * Randomly adding routes to the list is done to ensure that when
 330          * different nodes are using the same list of routers, they end up
 331          * preferring different routers.
 332          */
 333         offset = cfs_rand() % (len + 1);
 334         list_for_each(e, &rnet->lrn_routes) {
 335                 if (offset == 0)
 336                         break;
 337                 offset--;
 338         }
 339         list_add(&route->lr_list, e);
 340         /*
 341          * force a router check on the gateway to make sure the route is
 342          * alive
 343          */
 344         route->lr_gateway->lp_rtrcheck_timestamp = 0;
 345
 346         the_lnet.ln_remote_nets_version++;
 347
 348         /* add the route on the gateway list */
 349         list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
 350
 351         /* take a router reference count on the gateway */
 352         lnet_rtr_addref_locked(route->lr_gateway);
 353 }
 354
 355 int
 356 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
 357                unsigned int priority)
 358 {
 359         struct list_head *route_entry;
 360         struct lnet_remotenet *rnet;
 361         struct lnet_remotenet *rnet2;
 362         struct lnet_route *route;
 363         struct lnet_peer_ni *lpni;
 364         struct lnet_peer *gw;
 365         int add_route;
 366         int rc;
 367
 368         CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
 369                libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
 370
 371         if (gateway == LNET_NID_ANY ||
 372             LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
 373             net == LNET_NIDNET(LNET_NID_ANY) ||
 374             LNET_NETTYP(net) == LOLND ||
 375             LNET_NIDNET(gateway) == net ||
 376             (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
 377                 return -EINVAL;
 378
 379         /* it's a local network */
 380         if (lnet_islocalnet(net))
 381                 return -EEXIST;
 382
 383         /* Assume net, route, all new */
 384         LIBCFS_ALLOC(route, sizeof(*route));
 385         LIBCFS_ALLOC(rnet, sizeof(*rnet));
 386         if (route == NULL || rnet == NULL) {
 387                 CERROR("Out of memory creating route %s %d %s\n",
 388                        libcfs_net2str(net), hops, libcfs_nid2str(gateway));
 389                 if (route != NULL)
 390                         LIBCFS_FREE(route, sizeof(*route));
 391                 if (rnet != NULL)
 392                         LIBCFS_FREE(rnet, sizeof(*rnet));
 393                 return -ENOMEM;
 394         }
 395
 396         INIT_LIST_HEAD(&rnet->lrn_routes);
 397         rnet->lrn_net = net;
 398         /* store the local and remote net that the route represents */
 399         route->lr_lnet = LNET_NIDNET(gateway);
 400         route->lr_net = net;
 401         route->lr_priority = priority;
 402         route->lr_hops = hops;
 403
 404         lnet_net_lock(LNET_LOCK_EX);
 405
 406         /*
 407          * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
 408          * lose that once we're done
 409          */
 410         lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
 411         if (IS_ERR(lpni)) {
 412                 lnet_net_unlock(LNET_LOCK_EX);
 413
 414                 LIBCFS_FREE(route, sizeof(*route));
 415                 LIBCFS_FREE(rnet, sizeof(*rnet));
 416
 417                 rc = PTR_ERR(lpni);
 418                 CERROR("Error %d creating route %s %d %s\n", rc,
 419                         libcfs_net2str(net), hops,
 420                         libcfs_nid2str(gateway));
 421                 return rc;
 422         }
 423
 424         LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
 425         gw = lpni->lpni_peer_net->lpn_peer;
 426
 427         route->lr_gateway = gw;
 428
 429         rnet2 = lnet_find_rnet_locked(net);
 430         if (rnet2 == NULL) {
 431                 /* new network */
 432                 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
 433                 rnet2 = rnet;
 434         }
 435
 436         /* Search for a duplicate route (it's a NOOP if it is) */
 437         add_route = 1;
 438         list_for_each(route_entry, &rnet2->lrn_routes) {
 439                 struct lnet_route *route2;
 440
 441                 route2 = list_entry(route_entry, struct lnet_route, lr_list);
 442                 if (route2->lr_gateway == route->lr_gateway) {
 443                         add_route = 0;
 444                         break;
 445                 }
 446
 447                 /* our lookups must be true */
 448                 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
 449         }
 450
 451         /*
 452          * It is possible to add multiple routes through the same peer,
 453          * but it'll be using a different NID of that peer. When the
 454          * gateway is discovered, discovery will consolidate the different
 455          * peers into one peer. In this case the discovery code will have
 456          * to move the routes from the peer that's being deleted to the
 457          * consolidated peer lp_routes list
 458          */
 459         if (add_route)
 460                 lnet_add_route_to_rnet(rnet2, route);
 461
 462         /*
 463          * get rid of the reference on the lpni.
 464          */
 465         lnet_peer_ni_decref_locked(lpni);
 466         lnet_net_unlock(LNET_LOCK_EX);
 467
 468         rc = 0;
 469
 470         if (!add_route) {
 471                 rc = -EEXIST;
 472                 LIBCFS_FREE(route, sizeof(*route));
 473         }
 474
 475         if (rnet != rnet2)
 476                 LIBCFS_FREE(rnet, sizeof(*rnet));
 477
 478         /* kick start the monitor thread to handle the added route */
 479         wake_up(&the_lnet.ln_mt_waitq);
 480
 481         return rc;
 482 }
 483
 484 static void
 485 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
 486                          struct list_head *zombies)
 487 {
 488         struct lnet_peer *gateway;
 489         struct lnet_route *route;
 490         struct lnet_route *tmp;
 491
 492         list_for_each_entry_safe(route, tmp, route_list, lr_list) {
 493                 gateway = route->lr_gateway;
 494                 if (gw_nid != LNET_NID_ANY &&
 495                     gw_nid != gateway->lp_primary_nid)
 496                         continue;
 497
 498                 /*
 499                  * move to zombie to delete outside the lock
 500                  * Note that this function is called with the
 501                  * ln_api_mutex held as well as the exclusive net
 502                  * lock. Adding to the remote net list happens
 503                  * under the same conditions. Same goes for the
 504                  * gateway router list
 505                  */
 506                 list_move(&route->lr_list, zombies);
 507                 the_lnet.ln_remote_nets_version++;
 508
 509                 list_del(&route->lr_gwlist);
 510                 lnet_rtr_decref_locked(gateway);
 511         }
 512 }
 513
 514 int
 515 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
 516 {
 517         struct list_head rnet_zombies;
 518         struct lnet_remotenet *rnet;
 519         struct lnet_remotenet *tmp;
 520         struct list_head *rn_list;
 521         struct lnet_peer_ni *lpni;
 522         struct lnet_route *route;
 523         struct list_head zombies;
 524         struct lnet_peer *lp;
 525         int i = 0;
 526
 527         INIT_LIST_HEAD(&rnet_zombies);
 528         INIT_LIST_HEAD(&zombies);
 529
 530         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 531                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 532
 533         /* NB Caller may specify either all routes via the given gateway
 534          * or a specific route entry actual NIDs) */
 535
 536         lnet_net_lock(LNET_LOCK_EX);
 537
 538         lpni = lnet_find_peer_ni_locked(gw_nid);
 539         if (lpni) {
 540                 lp = lpni->lpni_peer_net->lpn_peer;
 541                 LASSERT(lp);
 542                 gw_nid = lp->lp_primary_nid;
 543                 lnet_peer_ni_decref_locked(lpni);
 544         }
 545
 546         if (net != LNET_NIDNET(LNET_NID_ANY)) {
 547                 rnet = lnet_find_rnet_locked(net);
 548                 if (!rnet) {
 549                         lnet_net_unlock(LNET_LOCK_EX);
 550                         return -ENOENT;
 551                 }
 552                 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
 553                                          &zombies);
 554                 if (list_empty(&rnet->lrn_routes))
 555                         list_move(&rnet->lrn_list, &rnet_zombies);
 556                 goto delete_zombies;
 557         }
 558
 559         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 560                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 561
 562                 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
 563                         lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
 564                                                  &zombies);
 565                         if (list_empty(&rnet->lrn_routes))
 566                                 list_move(&rnet->lrn_list, &rnet_zombies);
 567                 }
 568         }
 569
 570 delete_zombies:
 571         lnet_net_unlock(LNET_LOCK_EX);
 572
 573         while (!list_empty(&zombies)) {
 574                 route = list_first_entry(&zombies, struct lnet_route, lr_list);
 575                 list_del(&route->lr_list);
 576                 LIBCFS_FREE(route, sizeof(*route));
 577         }
 578
 579         while (!list_empty(&rnet_zombies)) {
 580                 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
 581                                         lrn_list);
 582                 list_del(&rnet->lrn_list);
 583                 LIBCFS_FREE(rnet, sizeof(*rnet));
 584         }
 585
 586         return 0;
 587 }
 588
 589 void
 590 lnet_destroy_routes (void)
 591 {
 592         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 593 }
 594
 595 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
 596 {
 597         struct lnet_rtrbufpool *rbp;
 598         int i, rc = -ENOENT, j;
 599
 600         if (the_lnet.ln_rtrpools == NULL)
 601                 return rc;
 602
 603
 604         cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 605                 if (i != cpt)
 606                         continue;
 607
 608                 lnet_net_lock(i);
 609                 for (j = 0; j < LNET_NRBPOOLS; j++) {
 610                         pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
 611                         pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
 612                         pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
 613                         pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
 614                 }
 615                 lnet_net_unlock(i);
 616                 rc = 0;
 617                 break;
 618         }
 619
 620         lnet_net_lock(LNET_LOCK_EX);
 621         pool_cfg->pl_routing = the_lnet.ln_routing;
 622         lnet_net_unlock(LNET_LOCK_EX);
 623
 624         return rc;
 625 }
 626
 627 int
 628 lnet_get_route(int idx, __u32 *net, __u32 *hops,
 629                lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
 630 {
 631         struct list_head *e1;
 632         struct list_head *e2;
 633         struct lnet_remotenet *rnet;
 634         struct lnet_route        *route;
 635         int               cpt;
 636         int               i;
 637         struct list_head *rn_list;
 638
 639         cpt = lnet_net_lock_current();
 640
 641         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 642                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 643                 list_for_each(e1, rn_list) {
 644                         rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
 645
 646                         list_for_each(e2, &rnet->lrn_routes) {
 647                                 route = list_entry(e2, struct lnet_route,
 648                                                    lr_list);
 649
 650                                 if (idx-- == 0) {
 651                                         *net      = rnet->lrn_net;
 652                                         *hops     = route->lr_hops;
 653                                         *priority = route->lr_priority;
 654                                         *gateway  = route->lr_gateway->lp_primary_nid;
 655                                         *alive    = lnet_is_route_alive(route);
 656                                         lnet_net_unlock(cpt);
 657                                         return 0;
 658                                 }
 659                         }
 660                 }
 661         }
 662
 663         lnet_net_unlock(cpt);
 664         return -ENOENT;
 665 }
 666
 667 void
 668 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
 669 {
 670         struct lnet_ni_status *stat;
 671         int nnis;
 672         int i;
 673
 674         __swab32s(&pbuf->pb_info.pi_magic);
 675         __swab32s(&pbuf->pb_info.pi_features);
 676         __swab32s(&pbuf->pb_info.pi_pid);
 677         __swab32s(&pbuf->pb_info.pi_nnis);
 678         nnis = pbuf->pb_info.pi_nnis;
 679         if (nnis > pbuf->pb_nnis)
 680                 nnis = pbuf->pb_nnis;
 681         for (i = 0; i < nnis; i++) {
 682                 stat = &pbuf->pb_info.pi_ni[i];
 683                 __swab64s(&stat->ns_nid);
 684                 __swab32s(&stat->ns_status);
 685         }
 686         return;
 687 }
 688
 689 /**
 690  * TODO: re-implement
 691  */
 692 static void
 693 lnet_parse_rc_info(struct lnet_rc_data *rcd)
 694 {
 695         rcd = rcd;
 696 }
 697
 698 static void
 699 lnet_router_checker_event(struct lnet_event *event)
 700 {
 701         struct lnet_rc_data *rcd = event->md.user_ptr;
 702         struct lnet_peer_ni *lp;
 703
 704         LASSERT(rcd != NULL);
 705
 706         if (event->unlinked) {
 707                 LNetInvalidateMDHandle(&rcd->rcd_mdh);
 708                 return;
 709         }
 710
 711         LASSERT(event->type == LNET_EVENT_SEND ||
 712                 event->type == LNET_EVENT_REPLY);
 713
 714         lp = rcd->rcd_gateway;
 715         LASSERT(lp != NULL);
 716
 717          /* NB: it's called with holding lnet_res_lock, we have a few
 718           * places need to hold both locks at the same time, please take
 719           * care of lock ordering */
 720         lnet_net_lock(lp->lpni_cpt);
 721         if (!lnet_isrouter(lp) || lp->lpni_rcd != rcd) {
 722                 /* ignore if no longer a router or rcd is replaced */
 723                 goto out;
 724         }
 725
 726         if (event->type == LNET_EVENT_SEND) {
 727                 if (event->status == 0)
 728                         goto out;
 729         }
 730
 731         /* LNET_EVENT_REPLY */
 732         /* A successful REPLY means the router is up.  If _any_ comms
 733          * to the router fail I assume it's down (this will happen if
 734          * we ping alive routers to try to detect router death before
 735          * apps get burned). */
 736
 737         lnet_notify_locked(lp, 1, !event->status, ktime_get_seconds());
 738         /* The router checker will wake up very shortly and do the
 739          * actual notification.
 740          * XXX If 'lp' stops being a router before then, it will still
 741          * have the notification pending!!! */
 742
 743         if (avoid_asym_router_failure && event->status == 0)
 744                 lnet_parse_rc_info(rcd);
 745
 746  out:
 747         lnet_net_unlock(lp->lpni_cpt);
 748 }
 749
 750 static void
 751 lnet_wait_known_routerstate(void)
 752 {
 753         struct lnet_peer *rtr;
 754         struct list_head *entry;
 755         int all_known;
 756
 757         LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
 758
 759         for (;;) {
 760                 int cpt = lnet_net_lock_current();
 761
 762                 all_known = 1;
 763                 list_for_each(entry, &the_lnet.ln_routers) {
 764                         rtr = list_entry(entry, struct lnet_peer,
 765                                          lp_rtr_list);
 766
 767                         spin_lock(&rtr->lp_lock);
 768
 769                         if ((rtr->lp_state & LNET_PEER_DISCOVERED) == 0) {
 770                                 all_known = 0;
 771                                 spin_unlock(&rtr->lp_lock);
 772                                 break;
 773                         }
 774                         spin_unlock(&rtr->lp_lock);
 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 /* TODO: reimplement */
 788 void
 789 lnet_router_ni_update_locked(struct lnet_peer_ni *gw, __u32 net)
 790 {
 791         struct lnet_route *rte;
 792         struct lnet_peer *lp;
 793
 794         if ((gw->lpni_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0)
 795                 lp = gw->lpni_peer_net->lpn_peer;
 796         else
 797                 return;
 798
 799         list_for_each_entry(rte, &lp->lp_routes, lr_gwlist) {
 800                 if (rte->lr_net == net) {
 801                         rte->lr_downis = 0;
 802                         break;
 803                 }
 804         }
 805 }
 806
 807 static void
 808 lnet_update_ni_status_locked(void)
 809 {
 810         struct lnet_ni *ni = NULL;
 811         time64_t now;
 812         time64_t timeout;
 813
 814         LASSERT(the_lnet.ln_routing);
 815
 816         timeout = router_ping_timeout +
 817                   MAX(live_router_check_interval, dead_router_check_interval);
 818
 819         now = ktime_get_real_seconds();
 820         while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
 821                 if (ni->ni_net->net_lnd->lnd_type == LOLND)
 822                         continue;
 823
 824                 if (now < ni->ni_last_alive + timeout)
 825                         continue;
 826
 827                 lnet_ni_lock(ni);
 828                 /* re-check with lock */
 829                 if (now < ni->ni_last_alive + timeout) {
 830                         lnet_ni_unlock(ni);
 831                         continue;
 832                 }
 833
 834                 LASSERT(ni->ni_status != NULL);
 835
 836                 if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
 837                         CDEBUG(D_NET, "NI(%s:%lld) status changed to down\n",
 838                                libcfs_nid2str(ni->ni_nid), timeout);
 839                         /* NB: so far, this is the only place to set
 840                          * NI status to "down" */
 841                         ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
 842                 }
 843                 lnet_ni_unlock(ni);
 844         }
 845 }
 846
 847 int lnet_router_pre_mt_start(void)
 848 {
 849         int rc;
 850
 851         if (check_routers_before_use &&
 852             dead_router_check_interval <= 0) {
 853                 LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
 854                                    " set if 'check_routers_before_use' is set"
 855                                    "\n");
 856                 return -EINVAL;
 857         }
 858
 859         rc = LNetEQAlloc(0, lnet_router_checker_event, &the_lnet.ln_rc_eqh);
 860         if (rc != 0) {
 861                 CERROR("Can't allocate EQ(0): %d\n", rc);
 862                 return -ENOMEM;
 863         }
 864
 865         return 0;
 866 }
 867
 868 void lnet_router_post_mt_start(void)
 869 {
 870         if (check_routers_before_use) {
 871                 /* Note that a helpful side-effect of pinging all known routers
 872                  * at startup is that it makes them drop stale connections they
 873                  * may have to a previous instance of me. */
 874                 lnet_wait_known_routerstate();
 875         }
 876 }
 877
 878 void
 879 lnet_router_cleanup(void)
 880 {
 881         int rc;
 882
 883         rc = LNetEQFree(the_lnet.ln_rc_eqh);
 884         LASSERT(rc == 0);
 885         return;
 886 }
 887
 888 void
 889 lnet_prune_rc_data(int wait_unlink)
 890 {
 891         wait_unlink = wait_unlink;
 892 }
 893
 894 /*
 895  * This function is called from the monitor thread to check if there are
 896  * any active routers that need to be checked.
 897  */
 898 inline bool
 899 lnet_router_checker_active(void)
 900 {
 901         if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
 902                 return true;
 903
 904         /* Router Checker thread needs to run when routing is enabled in
 905          * order to call lnet_update_ni_status_locked() */
 906         if (the_lnet.ln_routing)
 907                 return true;
 908
 909         /* if there are routers that need to be cleaned up then do so */
 910         if (!list_empty(&the_lnet.ln_rcd_deathrow) ||
 911             !list_empty(&the_lnet.ln_rcd_zombie))
 912                 return true;
 913
 914         return !list_empty(&the_lnet.ln_routers) &&
 915                 (live_router_check_interval > 0 ||
 916                  dead_router_check_interval > 0);
 917 }
 918
 919 void
 920 lnet_check_routers(void)
 921 {
 922         struct lnet_peer *rtr;
 923         struct list_head *entry;
 924         __u64   version;
 925         int     cpt;
 926
 927         cpt = lnet_net_lock_current();
 928 rescan:
 929         version = the_lnet.ln_routers_version;
 930
 931         list_for_each(entry, &the_lnet.ln_routers) {
 932                 rtr = list_entry(entry, struct lnet_peer,
 933                                  lp_rtr_list);
 934
 935                 /* TODO use discovery to determine if router is alive */
 936
 937                 /* NB dropped lock */
 938                 if (version != the_lnet.ln_routers_version) {
 939                         /* the routers list has changed */
 940                         goto rescan;
 941                 }
 942         }
 943
 944         if (the_lnet.ln_routing)
 945                 lnet_update_ni_status_locked();
 946
 947         lnet_net_unlock(cpt);
 948
 949         lnet_prune_rc_data(0); /* don't wait for UNLINK */
 950 }
 951
 952 void
 953 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
 954 {
 955         int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
 956
 957         while (--npages >= 0)
 958                 __free_page(rb->rb_kiov[npages].kiov_page);
 959
 960         LIBCFS_FREE(rb, sz);
 961 }
 962
 963 static struct lnet_rtrbuf *
 964 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
 965 {
 966         int            npages = rbp->rbp_npages;
 967         int            sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
 968         struct page   *page;
 969         struct lnet_rtrbuf *rb;
 970         int            i;
 971
 972         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
 973         if (rb == NULL)
 974                 return NULL;
 975
 976         rb->rb_pool = rbp;
 977
 978         for (i = 0; i < npages; i++) {
 979                 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
 980                                           GFP_KERNEL | __GFP_ZERO);
 981                 if (page == NULL) {
 982                         while (--i >= 0)
 983                                 __free_page(rb->rb_kiov[i].kiov_page);
 984
 985                         LIBCFS_FREE(rb, sz);
 986                         return NULL;
 987                 }
 988
 989                 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
 990                 rb->rb_kiov[i].kiov_offset = 0;
 991                 rb->rb_kiov[i].kiov_page = page;
 992         }
 993
 994         return rb;
 995 }
 996
 997 static void
 998 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
 999 {
1000         int npages = rbp->rbp_npages;
1001         struct lnet_rtrbuf *rb;
1002         struct list_head tmp;
1003
1004         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1005                 return;
1006
1007         INIT_LIST_HEAD(&tmp);
1008
1009         lnet_net_lock(cpt);
1010         list_splice_init(&rbp->rbp_msgs, &tmp);
1011         lnet_drop_routed_msgs_locked(&tmp, cpt);
1012         list_splice_init(&rbp->rbp_bufs, &tmp);
1013         rbp->rbp_req_nbuffers = 0;
1014         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1015         rbp->rbp_mincredits = 0;
1016         lnet_net_unlock(cpt);
1017
1018         /* Free buffers on the free list. */
1019         while (!list_empty(&tmp)) {
1020                 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1021                 list_del(&rb->rb_list);
1022                 lnet_destroy_rtrbuf(rb, npages);
1023         }
1024 }
1025
1026 static int
1027 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1028 {
1029         struct list_head rb_list;
1030         struct lnet_rtrbuf *rb;
1031         int             num_rb;
1032         int             num_buffers = 0;
1033         int             old_req_nbufs;
1034         int             npages = rbp->rbp_npages;
1035
1036         lnet_net_lock(cpt);
1037         /* If we are called for less buffers than already in the pool, we
1038          * just lower the req_nbuffers number and excess buffers will be
1039          * thrown away as they are returned to the free list.  Credits
1040          * then get adjusted as well.
1041          * If we already have enough buffers allocated to serve the
1042          * increase requested, then we can treat that the same way as we
1043          * do the decrease. */
1044         num_rb = nbufs - rbp->rbp_nbuffers;
1045         if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1046                 rbp->rbp_req_nbuffers = nbufs;
1047                 lnet_net_unlock(cpt);
1048                 return 0;
1049         }
1050         /* store the older value of rbp_req_nbuffers and then set it to
1051          * the new request to prevent lnet_return_rx_credits_locked() from
1052          * freeing buffers that we need to keep around */
1053         old_req_nbufs = rbp->rbp_req_nbuffers;
1054         rbp->rbp_req_nbuffers = nbufs;
1055         lnet_net_unlock(cpt);
1056
1057         INIT_LIST_HEAD(&rb_list);
1058
1059         /* allocate the buffers on a local list first.  If all buffers are
1060          * allocated successfully then join this list to the rbp buffer
1061          * list.  If not then free all allocated buffers. */
1062         while (num_rb-- > 0) {
1063                 rb = lnet_new_rtrbuf(rbp, cpt);
1064                 if (rb == NULL) {
1065                         CERROR("Failed to allocate %d route bufs of %d pages\n",
1066                                nbufs, npages);
1067
1068                         lnet_net_lock(cpt);
1069                         rbp->rbp_req_nbuffers = old_req_nbufs;
1070                         lnet_net_unlock(cpt);
1071
1072                         goto failed;
1073                 }
1074
1075                 list_add(&rb->rb_list, &rb_list);
1076                 num_buffers++;
1077         }
1078
1079         lnet_net_lock(cpt);
1080
1081         list_splice_tail(&rb_list, &rbp->rbp_bufs);
1082         rbp->rbp_nbuffers += num_buffers;
1083         rbp->rbp_credits += num_buffers;
1084         rbp->rbp_mincredits = rbp->rbp_credits;
1085         /* We need to schedule blocked msg using the newly
1086          * added buffers. */
1087         while (!list_empty(&rbp->rbp_bufs) &&
1088                !list_empty(&rbp->rbp_msgs))
1089                 lnet_schedule_blocked_locked(rbp);
1090
1091         lnet_net_unlock(cpt);
1092
1093         return 0;
1094
1095 failed:
1096         while (!list_empty(&rb_list)) {
1097                 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1098                 list_del(&rb->rb_list);
1099                 lnet_destroy_rtrbuf(rb, npages);
1100         }
1101
1102         return -ENOMEM;
1103 }
1104
1105 static void
1106 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1107 {
1108         INIT_LIST_HEAD(&rbp->rbp_msgs);
1109         INIT_LIST_HEAD(&rbp->rbp_bufs);
1110
1111         rbp->rbp_npages = npages;
1112         rbp->rbp_credits = 0;
1113         rbp->rbp_mincredits = 0;
1114 }
1115
1116 void
1117 lnet_rtrpools_free(int keep_pools)
1118 {
1119         struct lnet_rtrbufpool *rtrp;
1120         int               i;
1121
1122         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1123                 return;
1124
1125         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1126                 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1127                 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1128                 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1129         }
1130
1131         if (!keep_pools) {
1132                 cfs_percpt_free(the_lnet.ln_rtrpools);
1133                 the_lnet.ln_rtrpools = NULL;
1134         }
1135 }
1136
1137 static int
1138 lnet_nrb_tiny_calculate(void)
1139 {
1140         int     nrbs = LNET_NRB_TINY;
1141
1142         if (tiny_router_buffers < 0) {
1143                 LCONSOLE_ERROR_MSG(0x10c,
1144                                    "tiny_router_buffers=%d invalid when "
1145                                    "routing enabled\n", tiny_router_buffers);
1146                 return -EINVAL;
1147         }
1148
1149         if (tiny_router_buffers > 0)
1150                 nrbs = tiny_router_buffers;
1151
1152         nrbs /= LNET_CPT_NUMBER;
1153         return max(nrbs, LNET_NRB_TINY_MIN);
1154 }
1155
1156 static int
1157 lnet_nrb_small_calculate(void)
1158 {
1159         int     nrbs = LNET_NRB_SMALL;
1160
1161         if (small_router_buffers < 0) {
1162                 LCONSOLE_ERROR_MSG(0x10c,
1163                                    "small_router_buffers=%d invalid when "
1164                                    "routing enabled\n", small_router_buffers);
1165                 return -EINVAL;
1166         }
1167
1168         if (small_router_buffers > 0)
1169                 nrbs = small_router_buffers;
1170
1171         nrbs /= LNET_CPT_NUMBER;
1172         return max(nrbs, LNET_NRB_SMALL_MIN);
1173 }
1174
1175 static int
1176 lnet_nrb_large_calculate(void)
1177 {
1178         int     nrbs = LNET_NRB_LARGE;
1179
1180         if (large_router_buffers < 0) {
1181                 LCONSOLE_ERROR_MSG(0x10c,
1182                                    "large_router_buffers=%d invalid when "
1183                                    "routing enabled\n", large_router_buffers);
1184                 return -EINVAL;
1185         }
1186
1187         if (large_router_buffers > 0)
1188                 nrbs = large_router_buffers;
1189
1190         nrbs /= LNET_CPT_NUMBER;
1191         return max(nrbs, LNET_NRB_LARGE_MIN);
1192 }
1193
1194 int
1195 lnet_rtrpools_alloc(int im_a_router)
1196 {
1197         struct lnet_rtrbufpool *rtrp;
1198         int     nrb_tiny;
1199         int     nrb_small;
1200         int     nrb_large;
1201         int     rc;
1202         int     i;
1203
1204         if (!strcmp(forwarding, "")) {
1205                 /* not set either way */
1206                 if (!im_a_router)
1207                         return 0;
1208         } else if (!strcmp(forwarding, "disabled")) {
1209                 /* explicitly disabled */
1210                 return 0;
1211         } else if (!strcmp(forwarding, "enabled")) {
1212                 /* explicitly enabled */
1213         } else {
1214                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1215                                    "'enabled' or 'disabled'\n");
1216                 return -EINVAL;
1217         }
1218
1219         nrb_tiny = lnet_nrb_tiny_calculate();
1220         if (nrb_tiny < 0)
1221                 return -EINVAL;
1222
1223         nrb_small = lnet_nrb_small_calculate();
1224         if (nrb_small < 0)
1225                 return -EINVAL;
1226
1227         nrb_large = lnet_nrb_large_calculate();
1228         if (nrb_large < 0)
1229                 return -EINVAL;
1230
1231         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1232                                                 LNET_NRBPOOLS *
1233                                                 sizeof(struct lnet_rtrbufpool));
1234         if (the_lnet.ln_rtrpools == NULL) {
1235                 LCONSOLE_ERROR_MSG(0x10c,
1236                                    "Failed to initialize router buffe pool\n");
1237                 return -ENOMEM;
1238         }
1239
1240         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1241                 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1242                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1243                                               nrb_tiny, i);
1244                 if (rc != 0)
1245                         goto failed;
1246
1247                 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1248                                   LNET_NRB_SMALL_PAGES);
1249                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1250                                               nrb_small, i);
1251                 if (rc != 0)
1252                         goto failed;
1253
1254                 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1255                                   LNET_NRB_LARGE_PAGES);
1256                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1257                                               nrb_large, i);
1258                 if (rc != 0)
1259                         goto failed;
1260         }
1261
1262         lnet_net_lock(LNET_LOCK_EX);
1263         the_lnet.ln_routing = 1;
1264         lnet_net_unlock(LNET_LOCK_EX);
1265         wake_up(&the_lnet.ln_mt_waitq);
1266         return 0;
1267
1268  failed:
1269         lnet_rtrpools_free(0);
1270         return rc;
1271 }
1272
1273 static int
1274 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1275 {
1276         int nrb = 0;
1277         int rc = 0;
1278         int i;
1279         struct lnet_rtrbufpool *rtrp;
1280
1281         /* If the provided values for each buffer pool are different than the
1282          * configured values, we need to take action. */
1283         if (tiny >= 0) {
1284                 tiny_router_buffers = tiny;
1285                 nrb = lnet_nrb_tiny_calculate();
1286                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1287                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1288                                                       nrb, i);
1289                         if (rc != 0)
1290                                 return rc;
1291                 }
1292         }
1293         if (small >= 0) {
1294                 small_router_buffers = small;
1295                 nrb = lnet_nrb_small_calculate();
1296                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1297                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1298                                                       nrb, i);
1299                         if (rc != 0)
1300                                 return rc;
1301                 }
1302         }
1303         if (large >= 0) {
1304                 large_router_buffers = large;
1305                 nrb = lnet_nrb_large_calculate();
1306                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1307                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1308                                                       nrb, i);
1309                         if (rc != 0)
1310                                 return rc;
1311                 }
1312         }
1313
1314         return 0;
1315 }
1316
1317 int
1318 lnet_rtrpools_adjust(int tiny, int small, int large)
1319 {
1320         /* this function doesn't revert the changes if adding new buffers
1321          * failed.  It's up to the user space caller to revert the
1322          * changes. */
1323
1324         if (!the_lnet.ln_routing)
1325                 return 0;
1326
1327         return lnet_rtrpools_adjust_helper(tiny, small, large);
1328 }
1329
1330 int
1331 lnet_rtrpools_enable(void)
1332 {
1333         int rc = 0;
1334
1335         if (the_lnet.ln_routing)
1336                 return 0;
1337
1338         if (the_lnet.ln_rtrpools == NULL)
1339                 /* If routing is turned off, and we have never
1340                  * initialized the pools before, just call the
1341                  * standard buffer pool allocation routine as
1342                  * if we are just configuring this for the first
1343                  * time. */
1344                 rc = lnet_rtrpools_alloc(1);
1345         else
1346                 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1347         if (rc != 0)
1348                 return rc;
1349
1350         lnet_net_lock(LNET_LOCK_EX);
1351         the_lnet.ln_routing = 1;
1352
1353         the_lnet.ln_ping_target->pb_info.pi_features &=
1354                 ~LNET_PING_FEAT_RTE_DISABLED;
1355         lnet_net_unlock(LNET_LOCK_EX);
1356
1357         return rc;
1358 }
1359
1360 void
1361 lnet_rtrpools_disable(void)
1362 {
1363         if (!the_lnet.ln_routing)
1364                 return;
1365
1366         lnet_net_lock(LNET_LOCK_EX);
1367         the_lnet.ln_routing = 0;
1368         the_lnet.ln_ping_target->pb_info.pi_features |=
1369                 LNET_PING_FEAT_RTE_DISABLED;
1370
1371         tiny_router_buffers = 0;
1372         small_router_buffers = 0;
1373         large_router_buffers = 0;
1374         lnet_net_unlock(LNET_LOCK_EX);
1375         lnet_rtrpools_free(1);
1376 }
1377
1378 int
1379 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, int alive, time64_t when)
1380 {
1381         struct lnet_peer_ni *lp = NULL;
1382         time64_t now = ktime_get_seconds();
1383         int cpt = lnet_cpt_of_nid(nid, ni);
1384
1385         LASSERT (!in_interrupt ());
1386
1387         CDEBUG (D_NET, "%s notifying %s: %s\n",
1388                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1389                 libcfs_nid2str(nid),
1390                 alive ? "up" : "down");
1391
1392         if (ni != NULL &&
1393             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1394                 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1395                       libcfs_nid2str(nid), alive ? "birth" : "death",
1396                       libcfs_nid2str(ni->ni_nid));
1397                 return -EINVAL;
1398         }
1399
1400         /* can't do predictions... */
1401         if (when > now) {
1402                 CWARN("Ignoring prediction from %s of %s %s "
1403                       "%lld seconds in the future\n",
1404                       (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1405                       libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1406                 return -EINVAL;
1407         }
1408
1409         if (ni != NULL && !alive &&             /* LND telling me she's down */
1410             !auto_down) {                       /* auto-down disabled */
1411                 CDEBUG(D_NET, "Auto-down disabled\n");
1412                 return 0;
1413         }
1414
1415         lnet_net_lock(cpt);
1416
1417         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1418                 lnet_net_unlock(cpt);
1419                 return -ESHUTDOWN;
1420         }
1421
1422         lp = lnet_find_peer_ni_locked(nid);
1423         if (lp == NULL) {
1424                 /* nid not found */
1425                 lnet_net_unlock(cpt);
1426                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1427                 return 0;
1428         }
1429
1430         /*
1431          * It is possible for this function to be called for the same peer
1432          * but with different NIs. We want to synchronize the notification
1433          * between the different calls. So we will use the lpni_cpt to
1434          * grab the net lock.
1435          */
1436         if (lp->lpni_cpt != cpt) {
1437                 lnet_net_unlock(cpt);
1438                 cpt = lp->lpni_cpt;
1439                 lnet_net_lock(cpt);
1440         }
1441
1442         /* We can't fully trust LND on reporting exact peer last_alive
1443          * if he notifies us about dead peer. For example ksocklnd can
1444          * call us with when == _time_when_the_node_was_booted_ if
1445          * no connections were successfully established */
1446         if (ni != NULL && !alive && when < lp->lpni_last_alive)
1447                 when = lp->lpni_last_alive;
1448
1449         lnet_notify_locked(lp, ni == NULL, alive, when);
1450
1451         if (ni != NULL)
1452                 lnet_ni_notify_locked(ni, lp);
1453
1454         lnet_peer_ni_decref_locked(lp);
1455
1456         lnet_net_unlock(cpt);
1457         return 0;
1458 }
1459 EXPORT_SYMBOL(lnet_notify);