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 extern unsigned int lnet_current_net_count;
  39
  40 static char *forwarding = "";
  41 module_param(forwarding, charp, 0444);
  42 MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
  43
  44 static int tiny_router_buffers;
  45 module_param(tiny_router_buffers, int, 0444);
  46 MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
  47 static int small_router_buffers;
  48 module_param(small_router_buffers, int, 0444);
  49 MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
  50 static int large_router_buffers;
  51 module_param(large_router_buffers, int, 0444);
  52 MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
  53 static int peer_buffer_credits;
  54 module_param(peer_buffer_credits, int, 0444);
  55 MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
  56
  57 static int auto_down = 1;
  58 module_param(auto_down, int, 0444);
  59 MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
  60
  61 int
  62 lnet_peer_buffer_credits(struct lnet_net *net)
  63 {
  64         /* NI option overrides LNet default */
  65         if (net->net_tunables.lct_peer_rtr_credits > 0)
  66                 return net->net_tunables.lct_peer_rtr_credits;
  67         if (peer_buffer_credits > 0)
  68                 return peer_buffer_credits;
  69
  70         /* As an approximation, allow this peer the same number of router
  71          * buffers as it is allowed outstanding sends */
  72         return net->net_tunables.lct_peer_tx_credits;
  73 }
  74
  75 static int check_routers_before_use;
  76 module_param(check_routers_before_use, int, 0444);
  77 MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
  78
  79 int avoid_asym_router_failure = 1;
  80 module_param(avoid_asym_router_failure, int, 0644);
  81 MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
  82
  83 int alive_router_check_interval = 60;
  84 module_param(alive_router_check_interval, int, 0644);
  85 MODULE_PARM_DESC(alive_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
  86
  87 static int router_ping_timeout = 50;
  88 module_param(router_ping_timeout, int, 0644);
  89 MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
  90
  91 /*
  92  * A value between 0 and 100. 0 meaning that even if router's interfaces
  93  * have the worse health still consider the gateway usable.
  94  * 100 means that at least one interface on the route's remote net is 100%
  95  * healthy to consider the route alive.
  96  * The default is set to 100 to ensure we maintain the original behavior.
  97  */
  98 unsigned int router_sensitivity_percentage = 100;
  99 static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
 100 static struct kernel_param_ops param_ops_rtr_sensitivity = {
 101         .set = rtr_sensitivity_set,
 102         .get = param_get_int,
 103 };
 104 #define param_check_rtr_sensitivity(name, p) \
 105                 __param_check(name, p, int)
 106 #ifdef HAVE_KERNEL_PARAM_OPS
 107 module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR);
 108 #else
 109 module_param_call(router_sensitivity_percentage, rtr_sensitivity_set, param_get_int,
 110                   &router_sensitivity_percentage, S_IRUGO|S_IWUSR);
 111 #endif
 112 MODULE_PARM_DESC(router_sensitivity_percentage,
 113                 "How healthy a gateway should be to be used in percent");
 114
 115 static int
 116 rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
 117 {
 118         int rc;
 119         unsigned *sen = (unsigned *)kp->arg;
 120         unsigned long value;
 121
 122         rc = kstrtoul(val, 0, &value);
 123         if (rc) {
 124                 CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
 125                 return rc;
 126         }
 127
 128         if (value < 0 || value > 100) {
 129                 CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
 130                 return -EINVAL;
 131         }
 132
 133         /*
 134          * The purpose of locking the api_mutex here is to ensure that
 135          * the correct value ends up stored properly.
 136          */
 137         mutex_lock(&the_lnet.ln_api_mutex);
 138
 139         *sen = value;
 140
 141         mutex_unlock(&the_lnet.ln_api_mutex);
 142
 143         return 0;
 144 }
 145
 146 void
 147 lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target)
 148 {
 149         struct lnet_route *route;
 150
 151         lnet_net_lock(LNET_LOCK_EX);
 152         target->lp_rtr_refcount += src->lp_rtr_refcount;
 153         /* move the list of queued messages to the new peer */
 154         list_splice_init(&src->lp_rtrq, &target->lp_rtrq);
 155         /* move all the routes that reference the peer */
 156         list_splice_init(&src->lp_routes, &target->lp_routes);
 157         /* update all the routes to point to the new peer */
 158         list_for_each_entry(route, &target->lp_routes, lr_gwlist)
 159                 route->lr_gateway = target;
 160         /* remove the old peer from the ln_routers list */
 161         list_del_init(&src->lp_rtr_list);
 162         /* add the new peer to the ln_routers list */
 163         if (list_empty(&target->lp_rtr_list)) {
 164                 lnet_peer_addref_locked(target);
 165                 list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers);
 166         }
 167         /* reset the ref count on the old peer and decrement its ref count */
 168         src->lp_rtr_refcount = 0;
 169         lnet_peer_decref_locked(src);
 170         /* update the router version */
 171         the_lnet.ln_routers_version++;
 172         lnet_net_unlock(LNET_LOCK_EX);
 173 }
 174
 175 int
 176 lnet_peers_start_down(void)
 177 {
 178         return check_routers_before_use;
 179 }
 180
 181 /*
 182  * A net is alive if at least one gateway NI on the network is alive.
 183  */
 184 static bool
 185 lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
 186 {
 187         struct lnet_peer_ni *lpni;
 188
 189         list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
 190                 if (lnet_is_peer_ni_alive(lpni))
 191                         return true;
 192         }
 193
 194         return false;
 195 }
 196
 197 /*
 198  * a gateway is alive only if all its nets are alive
 199  * called with cpt lock held
 200  */
 201 bool lnet_is_gateway_alive(struct lnet_peer *gw)
 202 {
 203         struct lnet_peer_net *lpn;
 204
 205         list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
 206                 if (!lnet_is_gateway_net_alive(lpn))
 207                         return false;
 208         }
 209
 210         return true;
 211 }
 212
 213 /*
 214  * lnet_is_route_alive() needs to be called with cpt lock held
 215  * A route is alive if the gateway can route between the local network and
 216  * the remote network of the route.
 217  * This means at least one NI is alive on each of the local and remote
 218  * networks of the gateway.
 219  */
 220 bool lnet_is_route_alive(struct lnet_route *route)
 221 {
 222         struct lnet_peer *gw = route->lr_gateway;
 223         struct lnet_peer_net *llpn;
 224         struct lnet_peer_net *rlpn;
 225         bool route_alive;
 226
 227         /*
 228          * check the gateway's interfaces on the route rnet to make sure
 229          * that the gateway is viable.
 230          */
 231         llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
 232         if (!llpn)
 233                 return false;
 234
 235         route_alive = lnet_is_gateway_net_alive(llpn);
 236
 237         if (avoid_asym_router_failure) {
 238                 rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
 239                 if (!rlpn)
 240                         return false;
 241                 route_alive = route_alive &&
 242                               lnet_is_gateway_net_alive(rlpn);
 243         }
 244
 245         if (!route_alive)
 246                 return route_alive;
 247
 248         spin_lock(&gw->lp_lock);
 249         if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
 250                 if (gw->lp_rtr_refcount > 0)
 251                         CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
 252                                libcfs_nid2str(gw->lp_primary_nid));
 253                 route_alive = false;
 254         }
 255         spin_unlock(&gw->lp_lock);
 256
 257         return route_alive;
 258 }
 259
 260 void
 261 lnet_consolidate_routes_locked(struct lnet_peer *orig_lp,
 262                                struct lnet_peer *new_lp)
 263 {
 264         struct lnet_peer_ni *lpni;
 265         struct lnet_route *route;
 266
 267         /*
 268          * Although a route is correlated with a peer, but when it's added
 269          * a specific NID is used. That NID refers to a peer_ni within
 270          * a peer. There could be other peer_nis on the same net, which
 271          * can be used to send to that gateway. However when we are
 272          * consolidating gateways because of discovery, the nid used to
 273          * add the route might've moved between gateway peers. In this
 274          * case we want to move the route to the new gateway as well. The
 275          * intent here is not to confuse the user who added the route.
 276          */
 277         list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) {
 278                 lpni = lnet_peer_get_ni_locked(orig_lp, route->lr_nid);
 279                 if (!lpni) {
 280                         lnet_net_lock(LNET_LOCK_EX);
 281                         list_move(&route->lr_gwlist, &new_lp->lp_routes);
 282                         lnet_net_unlock(LNET_LOCK_EX);
 283                 }
 284         }
 285
 286 }
 287
 288 void
 289 lnet_router_discovery_complete(struct lnet_peer *lp)
 290 {
 291         struct lnet_peer_ni *lpni = NULL;
 292
 293         spin_lock(&lp->lp_lock);
 294         lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
 295         spin_unlock(&lp->lp_lock);
 296
 297         /*
 298          * Router discovery successful? All peer information would've been
 299          * updated already. No need to do any more processing
 300          */
 301         if (!lp->lp_dc_error)
 302                 return;
 303         /*
 304          * discovery failed? then we need to set the status of each lpni
 305          * to DOWN. It will be updated the next time we discover the
 306          * router. For router peer NIs not on local networks, we never send
 307          * messages directly to them, so their health will always remain
 308          * at maximum. We can only tell if they are up or down from the
 309          * status returned in the PING response. If we fail to get that
 310          * status in our scheduled router discovery, then we'll assume
 311          * it's down until we're told otherwise.
 312          */
 313         CDEBUG(D_NET, "%s: Router discovery failed %d\n",
 314                libcfs_nid2str(lp->lp_primary_nid), lp->lp_dc_error);
 315         while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
 316                 lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
 317 }
 318
 319 static void
 320 lnet_rtr_addref_locked(struct lnet_peer *lp)
 321 {
 322         LASSERT(lp->lp_rtr_refcount >= 0);
 323
 324         /* lnet_net_lock must be exclusively locked */
 325         lp->lp_rtr_refcount++;
 326         if (lp->lp_rtr_refcount == 1) {
 327                 list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
 328                 /* addref for the_lnet.ln_routers */
 329                 lnet_peer_addref_locked(lp);
 330                 the_lnet.ln_routers_version++;
 331         }
 332 }
 333
 334 static void
 335 lnet_rtr_decref_locked(struct lnet_peer *lp)
 336 {
 337         LASSERT(atomic_read(&lp->lp_refcount) > 0);
 338         LASSERT(lp->lp_rtr_refcount > 0);
 339
 340         /* lnet_net_lock must be exclusively locked */
 341         lp->lp_rtr_refcount--;
 342         if (lp->lp_rtr_refcount == 0) {
 343                 LASSERT(list_empty(&lp->lp_routes));
 344
 345                 list_del(&lp->lp_rtr_list);
 346                 /* decref for the_lnet.ln_routers */
 347                 lnet_peer_decref_locked(lp);
 348                 the_lnet.ln_routers_version++;
 349         }
 350 }
 351
 352 struct lnet_remotenet *
 353 lnet_find_rnet_locked(__u32 net)
 354 {
 355         struct lnet_remotenet *rnet;
 356         struct list_head *tmp;
 357         struct list_head *rn_list;
 358
 359         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
 360
 361         rn_list = lnet_net2rnethash(net);
 362         list_for_each(tmp, rn_list) {
 363                 rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
 364
 365                 if (rnet->lrn_net == net)
 366                         return rnet;
 367         }
 368         return NULL;
 369 }
 370
 371 static void lnet_shuffle_seed(void)
 372 {
 373         static int seeded;
 374         struct lnet_ni *ni = NULL;
 375
 376         if (seeded)
 377                 return;
 378
 379         /* Nodes with small feet have little entropy
 380          * the NID for this node gives the most entropy in the low bits */
 381         while ((ni = lnet_get_next_ni_locked(NULL, ni)))
 382                 add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
 383
 384         seeded = 1;
 385         return;
 386 }
 387
 388 /* NB expects LNET_LOCK held */
 389 static void
 390 lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
 391 {
 392         struct lnet_peer_net *lpn;
 393         unsigned int offset = 0;
 394         unsigned int len = 0;
 395         struct list_head *e;
 396
 397         lnet_shuffle_seed();
 398
 399         list_for_each(e, &rnet->lrn_routes)
 400                 len++;
 401
 402         /*
 403          * Randomly adding routes to the list is done to ensure that when
 404          * different nodes are using the same list of routers, they end up
 405          * preferring different routers.
 406          */
 407         offset = cfs_rand() % (len + 1);
 408         list_for_each(e, &rnet->lrn_routes) {
 409                 if (offset == 0)
 410                         break;
 411                 offset--;
 412         }
 413         list_add(&route->lr_list, e);
 414         /*
 415          * force a router check on the gateway to make sure the route is
 416          * alive
 417          */
 418         list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
 419                             lpn_peer_nets) {
 420                 lpn->lpn_rtrcheck_timestamp = 0;
 421         }
 422
 423         the_lnet.ln_remote_nets_version++;
 424
 425         /* add the route on the gateway list */
 426         list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes);
 427
 428         /* take a router reference count on the gateway */
 429         lnet_rtr_addref_locked(route->lr_gateway);
 430 }
 431
 432 int
 433 lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
 434                __u32 priority, __u32 sensitivity)
 435 {
 436         struct list_head *route_entry;
 437         struct lnet_remotenet *rnet;
 438         struct lnet_remotenet *rnet2;
 439         struct lnet_route *route;
 440         struct lnet_peer_ni *lpni;
 441         struct lnet_peer *gw;
 442         int add_route;
 443         int rc;
 444
 445         CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n",
 446                libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
 447
 448         if (gateway == LNET_NID_ANY ||
 449             LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
 450             net == LNET_NIDNET(LNET_NID_ANY) ||
 451             LNET_NETTYP(net) == LOLND ||
 452             LNET_NIDNET(gateway) == net ||
 453             (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
 454                 return -EINVAL;
 455
 456         /* it's a local network */
 457         if (lnet_islocalnet(net))
 458                 return -EEXIST;
 459
 460         /* Assume net, route, all new */
 461         LIBCFS_ALLOC(route, sizeof(*route));
 462         LIBCFS_ALLOC(rnet, sizeof(*rnet));
 463         if (route == NULL || rnet == NULL) {
 464                 CERROR("Out of memory creating route %s %d %s\n",
 465                        libcfs_net2str(net), hops, libcfs_nid2str(gateway));
 466                 if (route != NULL)
 467                         LIBCFS_FREE(route, sizeof(*route));
 468                 if (rnet != NULL)
 469                         LIBCFS_FREE(rnet, sizeof(*rnet));
 470                 return -ENOMEM;
 471         }
 472
 473         INIT_LIST_HEAD(&rnet->lrn_routes);
 474         rnet->lrn_net = net;
 475         /* store the local and remote net that the route represents */
 476         route->lr_lnet = LNET_NIDNET(gateway);
 477         route->lr_net = net;
 478         route->lr_nid = gateway;
 479         route->lr_priority = priority;
 480         route->lr_hops = hops;
 481
 482         lnet_net_lock(LNET_LOCK_EX);
 483
 484         /*
 485          * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
 486          * lose that once we're done
 487          */
 488         lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
 489         if (IS_ERR(lpni)) {
 490                 lnet_net_unlock(LNET_LOCK_EX);
 491
 492                 LIBCFS_FREE(route, sizeof(*route));
 493                 LIBCFS_FREE(rnet, sizeof(*rnet));
 494
 495                 rc = PTR_ERR(lpni);
 496                 CERROR("Error %d creating route %s %d %s\n", rc,
 497                         libcfs_net2str(net), hops,
 498                         libcfs_nid2str(gateway));
 499                 return rc;
 500         }
 501
 502         LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
 503         gw = lpni->lpni_peer_net->lpn_peer;
 504
 505         route->lr_gateway = gw;
 506
 507         rnet2 = lnet_find_rnet_locked(net);
 508         if (rnet2 == NULL) {
 509                 /* new network */
 510                 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
 511                 rnet2 = rnet;
 512         }
 513
 514         /* Search for a duplicate route (it's a NOOP if it is) */
 515         add_route = 1;
 516         list_for_each(route_entry, &rnet2->lrn_routes) {
 517                 struct lnet_route *route2;
 518
 519                 route2 = list_entry(route_entry, struct lnet_route, lr_list);
 520                 if (route2->lr_gateway == route->lr_gateway) {
 521                         add_route = 0;
 522                         break;
 523                 }
 524
 525                 /* our lookups must be true */
 526                 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
 527         }
 528
 529         /*
 530          * It is possible to add multiple routes through the same peer,
 531          * but it'll be using a different NID of that peer. When the
 532          * gateway is discovered, discovery will consolidate the different
 533          * peers into one peer. In this case the discovery code will have
 534          * to move the routes from the peer that's being deleted to the
 535          * consolidated peer lp_routes list
 536          */
 537         if (add_route) {
 538                 gw->lp_health_sensitivity = sensitivity;
 539                 lnet_add_route_to_rnet(rnet2, route);
 540         }
 541
 542         /*
 543          * get rid of the reference on the lpni.
 544          */
 545         lnet_peer_ni_decref_locked(lpni);
 546         lnet_net_unlock(LNET_LOCK_EX);
 547
 548         rc = 0;
 549
 550         if (!add_route) {
 551                 rc = -EEXIST;
 552                 LIBCFS_FREE(route, sizeof(*route));
 553         }
 554
 555         if (rnet != rnet2)
 556                 LIBCFS_FREE(rnet, sizeof(*rnet));
 557
 558         /* kick start the monitor thread to handle the added route */
 559         wake_up(&the_lnet.ln_mt_waitq);
 560
 561         return rc;
 562 }
 563
 564 static void
 565 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
 566                          struct list_head *zombies)
 567 {
 568         struct lnet_peer *gateway;
 569         struct lnet_route *route;
 570         struct lnet_route *tmp;
 571
 572         list_for_each_entry_safe(route, tmp, route_list, lr_list) {
 573                 gateway = route->lr_gateway;
 574                 if (gw_nid != LNET_NID_ANY &&
 575                     gw_nid != gateway->lp_primary_nid)
 576                         continue;
 577
 578                 /*
 579                  * move to zombie to delete outside the lock
 580                  * Note that this function is called with the
 581                  * ln_api_mutex held as well as the exclusive net
 582                  * lock. Adding to the remote net list happens
 583                  * under the same conditions. Same goes for the
 584                  * gateway router list
 585                  */
 586                 list_move(&route->lr_list, zombies);
 587                 the_lnet.ln_remote_nets_version++;
 588
 589                 list_del(&route->lr_gwlist);
 590                 lnet_rtr_decref_locked(gateway);
 591         }
 592 }
 593
 594 int
 595 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
 596 {
 597         struct list_head rnet_zombies;
 598         struct lnet_remotenet *rnet;
 599         struct lnet_remotenet *tmp;
 600         struct list_head *rn_list;
 601         struct lnet_peer_ni *lpni;
 602         struct lnet_route *route;
 603         struct list_head zombies;
 604         struct lnet_peer *lp;
 605         int i = 0;
 606
 607         INIT_LIST_HEAD(&rnet_zombies);
 608         INIT_LIST_HEAD(&zombies);
 609
 610         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 611                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 612
 613         /* NB Caller may specify either all routes via the given gateway
 614          * or a specific route entry actual NIDs) */
 615
 616         lnet_net_lock(LNET_LOCK_EX);
 617
 618         lpni = lnet_find_peer_ni_locked(gw_nid);
 619         if (lpni) {
 620                 lp = lpni->lpni_peer_net->lpn_peer;
 621                 LASSERT(lp);
 622                 gw_nid = lp->lp_primary_nid;
 623                 lnet_peer_ni_decref_locked(lpni);
 624         }
 625
 626         if (net != LNET_NIDNET(LNET_NID_ANY)) {
 627                 rnet = lnet_find_rnet_locked(net);
 628                 if (!rnet) {
 629                         lnet_net_unlock(LNET_LOCK_EX);
 630                         return -ENOENT;
 631                 }
 632                 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
 633                                          &zombies);
 634                 if (list_empty(&rnet->lrn_routes))
 635                         list_move(&rnet->lrn_list, &rnet_zombies);
 636                 goto delete_zombies;
 637         }
 638
 639         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 640                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 641
 642                 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
 643                         lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
 644                                                  &zombies);
 645                         if (list_empty(&rnet->lrn_routes))
 646                                 list_move(&rnet->lrn_list, &rnet_zombies);
 647                 }
 648         }
 649
 650 delete_zombies:
 651         /*
 652          * check if there are any routes remaining on the gateway
 653          * If there are no more routes make sure to set the peer's
 654          * lp_disc_net_id to 0 (invalid), in case we add more routes in
 655          * the future on that gateway, then we start our discovery process
 656          * from scratch
 657          */
 658         if (lpni) {
 659                 if (list_empty(&lp->lp_routes))
 660                         lp->lp_disc_net_id = 0;
 661         }
 662
 663         lnet_net_unlock(LNET_LOCK_EX);
 664
 665         while (!list_empty(&zombies)) {
 666                 route = list_first_entry(&zombies, struct lnet_route, lr_list);
 667                 list_del(&route->lr_list);
 668                 LIBCFS_FREE(route, sizeof(*route));
 669         }
 670
 671         while (!list_empty(&rnet_zombies)) {
 672                 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
 673                                         lrn_list);
 674                 list_del(&rnet->lrn_list);
 675                 LIBCFS_FREE(rnet, sizeof(*rnet));
 676         }
 677
 678         return 0;
 679 }
 680
 681 void
 682 lnet_destroy_routes (void)
 683 {
 684         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 685 }
 686
 687 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
 688 {
 689         struct lnet_rtrbufpool *rbp;
 690         int i, rc = -ENOENT, j;
 691
 692         if (the_lnet.ln_rtrpools == NULL)
 693                 return rc;
 694
 695
 696         cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 697                 if (i != cpt)
 698                         continue;
 699
 700                 lnet_net_lock(i);
 701                 for (j = 0; j < LNET_NRBPOOLS; j++) {
 702                         pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
 703                         pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
 704                         pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
 705                         pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
 706                 }
 707                 lnet_net_unlock(i);
 708                 rc = 0;
 709                 break;
 710         }
 711
 712         lnet_net_lock(LNET_LOCK_EX);
 713         pool_cfg->pl_routing = the_lnet.ln_routing;
 714         lnet_net_unlock(LNET_LOCK_EX);
 715
 716         return rc;
 717 }
 718
 719 int
 720 lnet_get_route(int idx, __u32 *net, __u32 *hops,
 721                lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
 722 {
 723         struct lnet_remotenet *rnet;
 724         struct list_head *rn_list;
 725         struct lnet_route *route;
 726         struct list_head *e1;
 727         struct list_head *e2;
 728         int cpt;
 729         int i;
 730
 731         cpt = lnet_net_lock_current();
 732
 733         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 734                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 735                 list_for_each(e1, rn_list) {
 736                         rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
 737
 738                         list_for_each(e2, &rnet->lrn_routes) {
 739                                 route = list_entry(e2, struct lnet_route,
 740                                                    lr_list);
 741
 742                                 if (idx-- == 0) {
 743                                         *net      = rnet->lrn_net;
 744                                         *gateway  = route->lr_nid;
 745                                         *hops     = route->lr_hops;
 746                                         *priority = route->lr_priority;
 747                                         *sensitivity = route->lr_gateway->
 748                                                 lp_health_sensitivity;
 749                                         *alive    = lnet_is_route_alive(route);
 750                                         lnet_net_unlock(cpt);
 751                                         return 0;
 752                                 }
 753                         }
 754                 }
 755         }
 756
 757         lnet_net_unlock(cpt);
 758         return -ENOENT;
 759 }
 760
 761 static void
 762 lnet_wait_known_routerstate(void)
 763 {
 764         struct lnet_peer *rtr;
 765         struct list_head *entry;
 766         int all_known;
 767
 768         LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
 769
 770         for (;;) {
 771                 int cpt = lnet_net_lock_current();
 772
 773                 all_known = 1;
 774                 list_for_each(entry, &the_lnet.ln_routers) {
 775                         rtr = list_entry(entry, struct lnet_peer,
 776                                          lp_rtr_list);
 777
 778                         spin_lock(&rtr->lp_lock);
 779
 780                         if ((rtr->lp_state & LNET_PEER_DISCOVERED) == 0) {
 781                                 all_known = 0;
 782                                 spin_unlock(&rtr->lp_lock);
 783                                 break;
 784                         }
 785                         spin_unlock(&rtr->lp_lock);
 786                 }
 787
 788                 lnet_net_unlock(cpt);
 789
 790                 if (all_known)
 791                         return;
 792
 793                 set_current_state(TASK_UNINTERRUPTIBLE);
 794                 schedule_timeout(cfs_time_seconds(1));
 795         }
 796 }
 797
 798 static inline bool
 799 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
 800 {
 801         struct lnet_ni *ni;
 802         bool update = false;
 803
 804         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 805                 lnet_ni_lock(ni);
 806                 if (ni->ni_status &&
 807                     ni->ni_status->ns_status != status) {
 808                     ni->ni_status->ns_status = status;
 809                     update = true;
 810                 }
 811                 lnet_ni_unlock(ni);
 812         }
 813
 814         return update;
 815 }
 816
 817 static bool
 818 lnet_update_ni_status_locked(void)
 819 {
 820         struct lnet_net *net;
 821         bool push = false;
 822         time64_t now;
 823         time64_t timeout;
 824
 825         LASSERT(the_lnet.ln_routing);
 826
 827         timeout = router_ping_timeout + alive_router_check_interval;
 828
 829         now = ktime_get_real_seconds();
 830         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 831                 if (net->net_lnd->lnd_type == LOLND)
 832                         continue;
 833
 834                 if (now < net->net_last_alive + timeout)
 835                         continue;
 836
 837                 spin_lock(&net->net_lock);
 838                 /* re-check with lock */
 839                 if (now < net->net_last_alive + timeout) {
 840                         spin_unlock(&net->net_lock);
 841                         continue;
 842                 }
 843                 spin_unlock(&net->net_lock);
 844
 845                 /*
 846                  * if the net didn't receive any traffic for past the
 847                  * timeout on any of its constituent NIs, then mark all
 848                  * the NIs down.
 849                  */
 850                 push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN);
 851         }
 852
 853         return push;
 854 }
 855
 856 void lnet_wait_router_start(void)
 857 {
 858         if (check_routers_before_use) {
 859                 /* Note that a helpful side-effect of pinging all known routers
 860                  * at startup is that it makes them drop stale connections they
 861                  * may have to a previous instance of me. */
 862                 lnet_wait_known_routerstate();
 863         }
 864 }
 865
 866 /*
 867  * This function is called from the monitor thread to check if there are
 868  * any active routers that need to be checked.
 869  */
 870 inline bool
 871 lnet_router_checker_active(void)
 872 {
 873         /* Router Checker thread needs to run when routing is enabled in
 874          * order to call lnet_update_ni_status_locked() */
 875         if (the_lnet.ln_routing)
 876                 return true;
 877
 878         return !list_empty(&the_lnet.ln_routers) &&
 879                 alive_router_check_interval > 0;
 880 }
 881
 882 void
 883 lnet_check_routers(void)
 884 {
 885         struct lnet_peer_net *first_lpn = NULL;
 886         struct lnet_peer_net *lpn;
 887         struct lnet_peer_ni *lpni;
 888         struct list_head *entry;
 889         struct lnet_peer *rtr;
 890         bool push = false;
 891         bool found_lpn;
 892         __u64 version;
 893         __u32 net_id;
 894         time64_t now;
 895         int cpt;
 896         int rc;
 897
 898         cpt = lnet_net_lock_current();
 899 rescan:
 900         version = the_lnet.ln_routers_version;
 901
 902         list_for_each(entry, &the_lnet.ln_routers) {
 903                 rtr = list_entry(entry, struct lnet_peer,
 904                                  lp_rtr_list);
 905
 906                 now = ktime_get_real_seconds();
 907
 908                 /*
 909                  * only discover the router if we've passed
 910                  * alive_router_check_interval seconds. Some of the router
 911                  * interfaces could be down and in that case they would be
 912                  * undergoing recovery separately from this discovery.
 913                  */
 914                 /* find next peer net which is also local */
 915                 net_id = rtr->lp_disc_net_id;
 916                 do {
 917                         lpn = lnet_get_next_peer_net_locked(rtr, net_id);
 918                         if (!lpn) {
 919                                 CERROR("gateway %s has no networks\n",
 920                                 libcfs_nid2str(rtr->lp_primary_nid));
 921                                 break;
 922                         }
 923                         if (first_lpn == lpn)
 924                                 break;
 925                         if (!first_lpn)
 926                                 first_lpn = lpn;
 927                         found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id);
 928                         net_id = lpn->lpn_net_id;
 929                 } while (!found_lpn);
 930
 931                 if (!found_lpn || !lpn) {
 932                         CERROR("no local network found for gateway %s\n",
 933                                libcfs_nid2str(rtr->lp_primary_nid));
 934                         continue;
 935                 }
 936
 937                 if (now - lpn->lpn_rtrcheck_timestamp <
 938                     alive_router_check_interval / lnet_current_net_count)
 939                        continue;
 940
 941                 /*
 942                  * If we're currently discovering the peer then don't
 943                  * issue another discovery
 944                  */
 945                 spin_lock(&rtr->lp_lock);
 946                 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) {
 947                         spin_unlock(&rtr->lp_lock);
 948                         continue;
 949                 }
 950                 /* make sure we actively discover the router */
 951                 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
 952                 rtr->lp_state |= LNET_PEER_RTR_DISCOVERY;
 953                 spin_unlock(&rtr->lp_lock);
 954
 955                 /* find the peer_ni associated with the primary NID */
 956                 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
 957                 if (!lpni) {
 958                         CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
 959                                libcfs_nid2str(rtr->lp_primary_nid));
 960                         continue;
 961                 }
 962                 lnet_peer_ni_addref_locked(lpni);
 963
 964                 /* specify the net to use */
 965                 rtr->lp_disc_net_id = lpn->lpn_net_id;
 966
 967                 /* discover the router */
 968                 CDEBUG(D_NET, "discover %s, cpt = %d\n",
 969                        libcfs_nid2str(lpni->lpni_nid), cpt);
 970                 rc = lnet_discover_peer_locked(lpni, cpt, false);
 971
 972                 /* decrement ref count acquired by find_peer_ni_locked() */
 973                 lnet_peer_ni_decref_locked(lpni);
 974
 975                 if (!rc)
 976                         lpn->lpn_rtrcheck_timestamp = now;
 977                 else
 978                         CERROR("Failed to discover router %s\n",
 979                                libcfs_nid2str(rtr->lp_primary_nid));
 980
 981                 /* NB dropped lock */
 982                 if (version != the_lnet.ln_routers_version) {
 983                         /* the routers list has changed */
 984                         goto rescan;
 985                 }
 986         }
 987
 988         if (the_lnet.ln_routing)
 989                 push = lnet_update_ni_status_locked();
 990
 991         lnet_net_unlock(cpt);
 992
 993         /* if the status of the ni changed update the peers */
 994         if (push)
 995                 lnet_push_update_to_peers(1);
 996 }
 997
 998 void
 999 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1000 {
1001         int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1002
1003         while (--npages >= 0)
1004                 __free_page(rb->rb_kiov[npages].kiov_page);
1005
1006         LIBCFS_FREE(rb, sz);
1007 }
1008
1009 static struct lnet_rtrbuf *
1010 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1011 {
1012         int            npages = rbp->rbp_npages;
1013         int            sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1014         struct page   *page;
1015         struct lnet_rtrbuf *rb;
1016         int            i;
1017
1018         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1019         if (rb == NULL)
1020                 return NULL;
1021
1022         rb->rb_pool = rbp;
1023
1024         for (i = 0; i < npages; i++) {
1025                 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1026                                           GFP_KERNEL | __GFP_ZERO);
1027                 if (page == NULL) {
1028                         while (--i >= 0)
1029                                 __free_page(rb->rb_kiov[i].kiov_page);
1030
1031                         LIBCFS_FREE(rb, sz);
1032                         return NULL;
1033                 }
1034
1035                 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
1036                 rb->rb_kiov[i].kiov_offset = 0;
1037                 rb->rb_kiov[i].kiov_page = page;
1038         }
1039
1040         return rb;
1041 }
1042
1043 static void
1044 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1045 {
1046         int npages = rbp->rbp_npages;
1047         struct lnet_rtrbuf *rb;
1048         struct list_head tmp;
1049
1050         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1051                 return;
1052
1053         INIT_LIST_HEAD(&tmp);
1054
1055         lnet_net_lock(cpt);
1056         list_splice_init(&rbp->rbp_msgs, &tmp);
1057         lnet_drop_routed_msgs_locked(&tmp, cpt);
1058         list_splice_init(&rbp->rbp_bufs, &tmp);
1059         rbp->rbp_req_nbuffers = 0;
1060         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1061         rbp->rbp_mincredits = 0;
1062         lnet_net_unlock(cpt);
1063
1064         /* Free buffers on the free list. */
1065         while (!list_empty(&tmp)) {
1066                 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1067                 list_del(&rb->rb_list);
1068                 lnet_destroy_rtrbuf(rb, npages);
1069         }
1070 }
1071
1072 static int
1073 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1074 {
1075         struct list_head rb_list;
1076         struct lnet_rtrbuf *rb;
1077         int             num_rb;
1078         int             num_buffers = 0;
1079         int             old_req_nbufs;
1080         int             npages = rbp->rbp_npages;
1081
1082         lnet_net_lock(cpt);
1083         /* If we are called for less buffers than already in the pool, we
1084          * just lower the req_nbuffers number and excess buffers will be
1085          * thrown away as they are returned to the free list.  Credits
1086          * then get adjusted as well.
1087          * If we already have enough buffers allocated to serve the
1088          * increase requested, then we can treat that the same way as we
1089          * do the decrease. */
1090         num_rb = nbufs - rbp->rbp_nbuffers;
1091         if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1092                 rbp->rbp_req_nbuffers = nbufs;
1093                 lnet_net_unlock(cpt);
1094                 return 0;
1095         }
1096         /* store the older value of rbp_req_nbuffers and then set it to
1097          * the new request to prevent lnet_return_rx_credits_locked() from
1098          * freeing buffers that we need to keep around */
1099         old_req_nbufs = rbp->rbp_req_nbuffers;
1100         rbp->rbp_req_nbuffers = nbufs;
1101         lnet_net_unlock(cpt);
1102
1103         INIT_LIST_HEAD(&rb_list);
1104
1105         /* allocate the buffers on a local list first.  If all buffers are
1106          * allocated successfully then join this list to the rbp buffer
1107          * list.  If not then free all allocated buffers. */
1108         while (num_rb-- > 0) {
1109                 rb = lnet_new_rtrbuf(rbp, cpt);
1110                 if (rb == NULL) {
1111                         CERROR("Failed to allocate %d route bufs of %d pages\n",
1112                                nbufs, npages);
1113
1114                         lnet_net_lock(cpt);
1115                         rbp->rbp_req_nbuffers = old_req_nbufs;
1116                         lnet_net_unlock(cpt);
1117
1118                         goto failed;
1119                 }
1120
1121                 list_add(&rb->rb_list, &rb_list);
1122                 num_buffers++;
1123         }
1124
1125         lnet_net_lock(cpt);
1126
1127         list_splice_tail(&rb_list, &rbp->rbp_bufs);
1128         rbp->rbp_nbuffers += num_buffers;
1129         rbp->rbp_credits += num_buffers;
1130         rbp->rbp_mincredits = rbp->rbp_credits;
1131         /* We need to schedule blocked msg using the newly
1132          * added buffers. */
1133         while (!list_empty(&rbp->rbp_bufs) &&
1134                !list_empty(&rbp->rbp_msgs))
1135                 lnet_schedule_blocked_locked(rbp);
1136
1137         lnet_net_unlock(cpt);
1138
1139         return 0;
1140
1141 failed:
1142         while (!list_empty(&rb_list)) {
1143                 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1144                 list_del(&rb->rb_list);
1145                 lnet_destroy_rtrbuf(rb, npages);
1146         }
1147
1148         return -ENOMEM;
1149 }
1150
1151 static void
1152 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1153 {
1154         INIT_LIST_HEAD(&rbp->rbp_msgs);
1155         INIT_LIST_HEAD(&rbp->rbp_bufs);
1156
1157         rbp->rbp_npages = npages;
1158         rbp->rbp_credits = 0;
1159         rbp->rbp_mincredits = 0;
1160 }
1161
1162 void
1163 lnet_rtrpools_free(int keep_pools)
1164 {
1165         struct lnet_rtrbufpool *rtrp;
1166         int               i;
1167
1168         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1169                 return;
1170
1171         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1172                 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1173                 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1174                 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1175         }
1176
1177         if (!keep_pools) {
1178                 cfs_percpt_free(the_lnet.ln_rtrpools);
1179                 the_lnet.ln_rtrpools = NULL;
1180         }
1181 }
1182
1183 static int
1184 lnet_nrb_tiny_calculate(void)
1185 {
1186         int     nrbs = LNET_NRB_TINY;
1187
1188         if (tiny_router_buffers < 0) {
1189                 LCONSOLE_ERROR_MSG(0x10c,
1190                                    "tiny_router_buffers=%d invalid when "
1191                                    "routing enabled\n", tiny_router_buffers);
1192                 return -EINVAL;
1193         }
1194
1195         if (tiny_router_buffers > 0)
1196                 nrbs = tiny_router_buffers;
1197
1198         nrbs /= LNET_CPT_NUMBER;
1199         return max(nrbs, LNET_NRB_TINY_MIN);
1200 }
1201
1202 static int
1203 lnet_nrb_small_calculate(void)
1204 {
1205         int     nrbs = LNET_NRB_SMALL;
1206
1207         if (small_router_buffers < 0) {
1208                 LCONSOLE_ERROR_MSG(0x10c,
1209                                    "small_router_buffers=%d invalid when "
1210                                    "routing enabled\n", small_router_buffers);
1211                 return -EINVAL;
1212         }
1213
1214         if (small_router_buffers > 0)
1215                 nrbs = small_router_buffers;
1216
1217         nrbs /= LNET_CPT_NUMBER;
1218         return max(nrbs, LNET_NRB_SMALL_MIN);
1219 }
1220
1221 static int
1222 lnet_nrb_large_calculate(void)
1223 {
1224         int     nrbs = LNET_NRB_LARGE;
1225
1226         if (large_router_buffers < 0) {
1227                 LCONSOLE_ERROR_MSG(0x10c,
1228                                    "large_router_buffers=%d invalid when "
1229                                    "routing enabled\n", large_router_buffers);
1230                 return -EINVAL;
1231         }
1232
1233         if (large_router_buffers > 0)
1234                 nrbs = large_router_buffers;
1235
1236         nrbs /= LNET_CPT_NUMBER;
1237         return max(nrbs, LNET_NRB_LARGE_MIN);
1238 }
1239
1240 int
1241 lnet_rtrpools_alloc(int im_a_router)
1242 {
1243         struct lnet_rtrbufpool *rtrp;
1244         int     nrb_tiny;
1245         int     nrb_small;
1246         int     nrb_large;
1247         int     rc;
1248         int     i;
1249
1250         if (!strcmp(forwarding, "")) {
1251                 /* not set either way */
1252                 if (!im_a_router)
1253                         return 0;
1254         } else if (!strcmp(forwarding, "disabled")) {
1255                 /* explicitly disabled */
1256                 return 0;
1257         } else if (!strcmp(forwarding, "enabled")) {
1258                 /* explicitly enabled */
1259         } else {
1260                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1261                                    "'enabled' or 'disabled'\n");
1262                 return -EINVAL;
1263         }
1264
1265         nrb_tiny = lnet_nrb_tiny_calculate();
1266         if (nrb_tiny < 0)
1267                 return -EINVAL;
1268
1269         nrb_small = lnet_nrb_small_calculate();
1270         if (nrb_small < 0)
1271                 return -EINVAL;
1272
1273         nrb_large = lnet_nrb_large_calculate();
1274         if (nrb_large < 0)
1275                 return -EINVAL;
1276
1277         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1278                                                 LNET_NRBPOOLS *
1279                                                 sizeof(struct lnet_rtrbufpool));
1280         if (the_lnet.ln_rtrpools == NULL) {
1281                 LCONSOLE_ERROR_MSG(0x10c,
1282                                    "Failed to initialize router buffe pool\n");
1283                 return -ENOMEM;
1284         }
1285
1286         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1287                 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1288                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1289                                               nrb_tiny, i);
1290                 if (rc != 0)
1291                         goto failed;
1292
1293                 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1294                                   LNET_NRB_SMALL_PAGES);
1295                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1296                                               nrb_small, i);
1297                 if (rc != 0)
1298                         goto failed;
1299
1300                 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1301                                   LNET_NRB_LARGE_PAGES);
1302                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1303                                               nrb_large, i);
1304                 if (rc != 0)
1305                         goto failed;
1306         }
1307
1308         lnet_net_lock(LNET_LOCK_EX);
1309         the_lnet.ln_routing = 1;
1310         lnet_net_unlock(LNET_LOCK_EX);
1311         wake_up(&the_lnet.ln_mt_waitq);
1312         return 0;
1313
1314  failed:
1315         lnet_rtrpools_free(0);
1316         return rc;
1317 }
1318
1319 static int
1320 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1321 {
1322         int nrb = 0;
1323         int rc = 0;
1324         int i;
1325         struct lnet_rtrbufpool *rtrp;
1326
1327         /* If the provided values for each buffer pool are different than the
1328          * configured values, we need to take action. */
1329         if (tiny >= 0) {
1330                 tiny_router_buffers = tiny;
1331                 nrb = lnet_nrb_tiny_calculate();
1332                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1333                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1334                                                       nrb, i);
1335                         if (rc != 0)
1336                                 return rc;
1337                 }
1338         }
1339         if (small >= 0) {
1340                 small_router_buffers = small;
1341                 nrb = lnet_nrb_small_calculate();
1342                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1343                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1344                                                       nrb, i);
1345                         if (rc != 0)
1346                                 return rc;
1347                 }
1348         }
1349         if (large >= 0) {
1350                 large_router_buffers = large;
1351                 nrb = lnet_nrb_large_calculate();
1352                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1353                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1354                                                       nrb, i);
1355                         if (rc != 0)
1356                                 return rc;
1357                 }
1358         }
1359
1360         return 0;
1361 }
1362
1363 int
1364 lnet_rtrpools_adjust(int tiny, int small, int large)
1365 {
1366         /* this function doesn't revert the changes if adding new buffers
1367          * failed.  It's up to the user space caller to revert the
1368          * changes. */
1369
1370         if (!the_lnet.ln_routing)
1371                 return 0;
1372
1373         return lnet_rtrpools_adjust_helper(tiny, small, large);
1374 }
1375
1376 int
1377 lnet_rtrpools_enable(void)
1378 {
1379         int rc = 0;
1380
1381         if (the_lnet.ln_routing)
1382                 return 0;
1383
1384         if (the_lnet.ln_rtrpools == NULL)
1385                 /* If routing is turned off, and we have never
1386                  * initialized the pools before, just call the
1387                  * standard buffer pool allocation routine as
1388                  * if we are just configuring this for the first
1389                  * time. */
1390                 rc = lnet_rtrpools_alloc(1);
1391         else
1392                 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1393         if (rc != 0)
1394                 return rc;
1395
1396         lnet_net_lock(LNET_LOCK_EX);
1397         the_lnet.ln_routing = 1;
1398
1399         the_lnet.ln_ping_target->pb_info.pi_features &=
1400                 ~LNET_PING_FEAT_RTE_DISABLED;
1401         lnet_net_unlock(LNET_LOCK_EX);
1402
1403         return rc;
1404 }
1405
1406 void
1407 lnet_rtrpools_disable(void)
1408 {
1409         if (!the_lnet.ln_routing)
1410                 return;
1411
1412         lnet_net_lock(LNET_LOCK_EX);
1413         the_lnet.ln_routing = 0;
1414         the_lnet.ln_ping_target->pb_info.pi_features |=
1415                 LNET_PING_FEAT_RTE_DISABLED;
1416
1417         tiny_router_buffers = 0;
1418         small_router_buffers = 0;
1419         large_router_buffers = 0;
1420         lnet_net_unlock(LNET_LOCK_EX);
1421         lnet_rtrpools_free(1);
1422 }
1423
1424 static inline void
1425 lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid)
1426 {
1427         if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1428                 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1429 }
1430
1431 /*
1432  * ni: local NI used to communicate with the peer
1433  * nid: peer NID
1434  * alive: true if peer is alive, false otherwise
1435  * reset: reset health value. This is requested by the LND.
1436  * when: notificaiton time.
1437  */
1438 int
1439 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
1440             time64_t when)
1441 {
1442         struct lnet_peer_ni *lpni = NULL;
1443         time64_t now = ktime_get_seconds();
1444         int cpt;
1445
1446         LASSERT (!in_interrupt ());
1447
1448         CDEBUG (D_NET, "%s notifying %s: %s\n",
1449                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1450                 libcfs_nid2str(nid),
1451                 alive ? "up" : "down");
1452
1453         if (ni != NULL &&
1454             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1455                 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1456                       libcfs_nid2str(nid), alive ? "birth" : "death",
1457                       libcfs_nid2str(ni->ni_nid));
1458                 return -EINVAL;
1459         }
1460
1461         /* can't do predictions... */
1462         if (when > now) {
1463                 CWARN("Ignoring prediction from %s of %s %s "
1464                       "%lld seconds in the future\n",
1465                       (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1466                       libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1467                 return -EINVAL;
1468         }
1469
1470         if (ni != NULL && !alive &&             /* LND telling me she's down */
1471             !auto_down) {                       /* auto-down disabled */
1472                 CDEBUG(D_NET, "Auto-down disabled\n");
1473                 return 0;
1474         }
1475
1476         /* must lock 0 since this is used for synchronization */
1477         lnet_net_lock(0);
1478
1479         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1480                 lnet_net_unlock(0);
1481                 return -ESHUTDOWN;
1482         }
1483
1484         lpni = lnet_find_peer_ni_locked(nid);
1485         if (lpni == NULL) {
1486                 /* nid not found */
1487                 lnet_net_unlock(0);
1488                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1489                 return 0;
1490         }
1491
1492         if (alive) {
1493                 if (reset)
1494                         lnet_set_healthv(&lpni->lpni_healthv,
1495                                          LNET_MAX_HEALTH_VALUE);
1496                 else
1497                         lnet_inc_healthv(&lpni->lpni_healthv);
1498         } else {
1499                 lnet_handle_remote_failure_locked(lpni);
1500         }
1501
1502         /* recalculate aliveness */
1503         alive = lnet_is_peer_ni_alive(lpni);
1504         lnet_net_unlock(0);
1505
1506         if (ni != NULL && !alive)
1507                 lnet_notify_peer_down(ni, lpni->lpni_nid);
1508
1509         cpt = lpni->lpni_cpt;
1510         lnet_net_lock(cpt);
1511         lnet_peer_ni_decref_locked(lpni);
1512         lnet_net_unlock(cpt);
1513
1514         return 0;
1515 }
1516 EXPORT_SYMBOL(lnet_notify);