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 = prandom_u32_max(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         if (!lnet_islocalnet(LNET_NIDNET(gateway))) {
 461                 CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
 462                        libcfs_nid2str(gateway),
 463                        libcfs_net2str(LNET_NIDNET(gateway)));
 464                 return -EINVAL;
 465         }
 466
 467         /* Assume net, route, all new */
 468         LIBCFS_ALLOC(route, sizeof(*route));
 469         LIBCFS_ALLOC(rnet, sizeof(*rnet));
 470         if (route == NULL || rnet == NULL) {
 471                 CERROR("Out of memory creating route %s %d %s\n",
 472                        libcfs_net2str(net), hops, libcfs_nid2str(gateway));
 473                 if (route != NULL)
 474                         LIBCFS_FREE(route, sizeof(*route));
 475                 if (rnet != NULL)
 476                         LIBCFS_FREE(rnet, sizeof(*rnet));
 477                 return -ENOMEM;
 478         }
 479
 480         INIT_LIST_HEAD(&rnet->lrn_routes);
 481         rnet->lrn_net = net;
 482         /* store the local and remote net that the route represents */
 483         route->lr_lnet = LNET_NIDNET(gateway);
 484         route->lr_net = net;
 485         route->lr_nid = gateway;
 486         route->lr_priority = priority;
 487         route->lr_hops = hops;
 488
 489         lnet_net_lock(LNET_LOCK_EX);
 490
 491         /*
 492          * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
 493          * lose that once we're done
 494          */
 495         lpni = lnet_nid2peerni_ex(gateway, LNET_LOCK_EX);
 496         if (IS_ERR(lpni)) {
 497                 lnet_net_unlock(LNET_LOCK_EX);
 498
 499                 LIBCFS_FREE(route, sizeof(*route));
 500                 LIBCFS_FREE(rnet, sizeof(*rnet));
 501
 502                 rc = PTR_ERR(lpni);
 503                 CERROR("Error %d creating route %s %d %s\n", rc,
 504                         libcfs_net2str(net), hops,
 505                         libcfs_nid2str(gateway));
 506                 return rc;
 507         }
 508
 509         LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
 510         gw = lpni->lpni_peer_net->lpn_peer;
 511
 512         route->lr_gateway = gw;
 513
 514         rnet2 = lnet_find_rnet_locked(net);
 515         if (rnet2 == NULL) {
 516                 /* new network */
 517                 list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
 518                 rnet2 = rnet;
 519         }
 520
 521         /* Search for a duplicate route (it's a NOOP if it is) */
 522         add_route = 1;
 523         list_for_each(route_entry, &rnet2->lrn_routes) {
 524                 struct lnet_route *route2;
 525
 526                 route2 = list_entry(route_entry, struct lnet_route, lr_list);
 527                 if (route2->lr_gateway == route->lr_gateway) {
 528                         add_route = 0;
 529                         break;
 530                 }
 531
 532                 /* our lookups must be true */
 533                 LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
 534         }
 535
 536         /*
 537          * It is possible to add multiple routes through the same peer,
 538          * but it'll be using a different NID of that peer. When the
 539          * gateway is discovered, discovery will consolidate the different
 540          * peers into one peer. In this case the discovery code will have
 541          * to move the routes from the peer that's being deleted to the
 542          * consolidated peer lp_routes list
 543          */
 544         if (add_route) {
 545                 gw->lp_health_sensitivity = sensitivity;
 546                 lnet_add_route_to_rnet(rnet2, route);
 547         }
 548
 549         /*
 550          * get rid of the reference on the lpni.
 551          */
 552         lnet_peer_ni_decref_locked(lpni);
 553         lnet_net_unlock(LNET_LOCK_EX);
 554
 555         rc = 0;
 556
 557         if (!add_route) {
 558                 rc = -EEXIST;
 559                 LIBCFS_FREE(route, sizeof(*route));
 560         }
 561
 562         if (rnet != rnet2)
 563                 LIBCFS_FREE(rnet, sizeof(*rnet));
 564
 565         /* kick start the monitor thread to handle the added route */
 566         wake_up(&the_lnet.ln_mt_waitq);
 567
 568         return rc;
 569 }
 570
 571 static void
 572 lnet_del_route_from_rnet(lnet_nid_t gw_nid, struct list_head *route_list,
 573                          struct list_head *zombies)
 574 {
 575         struct lnet_peer *gateway;
 576         struct lnet_route *route;
 577         struct lnet_route *tmp;
 578
 579         list_for_each_entry_safe(route, tmp, route_list, lr_list) {
 580                 gateway = route->lr_gateway;
 581                 if (gw_nid != LNET_NID_ANY &&
 582                     gw_nid != gateway->lp_primary_nid)
 583                         continue;
 584
 585                 /*
 586                  * move to zombie to delete outside the lock
 587                  * Note that this function is called with the
 588                  * ln_api_mutex held as well as the exclusive net
 589                  * lock. Adding to the remote net list happens
 590                  * under the same conditions. Same goes for the
 591                  * gateway router list
 592                  */
 593                 list_move(&route->lr_list, zombies);
 594                 the_lnet.ln_remote_nets_version++;
 595
 596                 list_del(&route->lr_gwlist);
 597                 lnet_rtr_decref_locked(gateway);
 598         }
 599 }
 600
 601 int
 602 lnet_del_route(__u32 net, lnet_nid_t gw_nid)
 603 {
 604         struct list_head rnet_zombies;
 605         struct lnet_remotenet *rnet;
 606         struct lnet_remotenet *tmp;
 607         struct list_head *rn_list;
 608         struct lnet_peer_ni *lpni;
 609         struct lnet_route *route;
 610         struct list_head zombies;
 611         struct lnet_peer *lp;
 612         int i = 0;
 613
 614         INIT_LIST_HEAD(&rnet_zombies);
 615         INIT_LIST_HEAD(&zombies);
 616
 617         CDEBUG(D_NET, "Del route: net %s : gw %s\n",
 618                libcfs_net2str(net), libcfs_nid2str(gw_nid));
 619
 620         /* NB Caller may specify either all routes via the given gateway
 621          * or a specific route entry actual NIDs) */
 622
 623         lnet_net_lock(LNET_LOCK_EX);
 624
 625         lpni = lnet_find_peer_ni_locked(gw_nid);
 626         if (lpni) {
 627                 lp = lpni->lpni_peer_net->lpn_peer;
 628                 LASSERT(lp);
 629                 gw_nid = lp->lp_primary_nid;
 630                 lnet_peer_ni_decref_locked(lpni);
 631         }
 632
 633         if (net != LNET_NIDNET(LNET_NID_ANY)) {
 634                 rnet = lnet_find_rnet_locked(net);
 635                 if (!rnet) {
 636                         lnet_net_unlock(LNET_LOCK_EX);
 637                         return -ENOENT;
 638                 }
 639                 lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
 640                                          &zombies);
 641                 if (list_empty(&rnet->lrn_routes))
 642                         list_move(&rnet->lrn_list, &rnet_zombies);
 643                 goto delete_zombies;
 644         }
 645
 646         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 647                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 648
 649                 list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
 650                         lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes,
 651                                                  &zombies);
 652                         if (list_empty(&rnet->lrn_routes))
 653                                 list_move(&rnet->lrn_list, &rnet_zombies);
 654                 }
 655         }
 656
 657 delete_zombies:
 658         /*
 659          * check if there are any routes remaining on the gateway
 660          * If there are no more routes make sure to set the peer's
 661          * lp_disc_net_id to 0 (invalid), in case we add more routes in
 662          * the future on that gateway, then we start our discovery process
 663          * from scratch
 664          */
 665         if (lpni) {
 666                 if (list_empty(&lp->lp_routes))
 667                         lp->lp_disc_net_id = 0;
 668         }
 669
 670         lnet_net_unlock(LNET_LOCK_EX);
 671
 672         while (!list_empty(&zombies)) {
 673                 route = list_first_entry(&zombies, struct lnet_route, lr_list);
 674                 list_del(&route->lr_list);
 675                 LIBCFS_FREE(route, sizeof(*route));
 676         }
 677
 678         while (!list_empty(&rnet_zombies)) {
 679                 rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet,
 680                                         lrn_list);
 681                 list_del(&rnet->lrn_list);
 682                 LIBCFS_FREE(rnet, sizeof(*rnet));
 683         }
 684
 685         return 0;
 686 }
 687
 688 void
 689 lnet_destroy_routes (void)
 690 {
 691         lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
 692 }
 693
 694 int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
 695 {
 696         struct lnet_rtrbufpool *rbp;
 697         int i, rc = -ENOENT, j;
 698
 699         if (the_lnet.ln_rtrpools == NULL)
 700                 return rc;
 701
 702
 703         cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 704                 if (i != cpt)
 705                         continue;
 706
 707                 lnet_net_lock(i);
 708                 for (j = 0; j < LNET_NRBPOOLS; j++) {
 709                         pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
 710                         pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
 711                         pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
 712                         pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
 713                 }
 714                 lnet_net_unlock(i);
 715                 rc = 0;
 716                 break;
 717         }
 718
 719         lnet_net_lock(LNET_LOCK_EX);
 720         pool_cfg->pl_routing = the_lnet.ln_routing;
 721         lnet_net_unlock(LNET_LOCK_EX);
 722
 723         return rc;
 724 }
 725
 726 int
 727 lnet_get_route(int idx, __u32 *net, __u32 *hops,
 728                lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
 729 {
 730         struct lnet_remotenet *rnet;
 731         struct list_head *rn_list;
 732         struct lnet_route *route;
 733         struct list_head *e1;
 734         struct list_head *e2;
 735         int cpt;
 736         int i;
 737
 738         cpt = lnet_net_lock_current();
 739
 740         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
 741                 rn_list = &the_lnet.ln_remote_nets_hash[i];
 742                 list_for_each(e1, rn_list) {
 743                         rnet = list_entry(e1, struct lnet_remotenet, lrn_list);
 744
 745                         list_for_each(e2, &rnet->lrn_routes) {
 746                                 route = list_entry(e2, struct lnet_route,
 747                                                    lr_list);
 748
 749                                 if (idx-- == 0) {
 750                                         *net      = rnet->lrn_net;
 751                                         *gateway  = route->lr_nid;
 752                                         *hops     = route->lr_hops;
 753                                         *priority = route->lr_priority;
 754                                         *sensitivity = route->lr_gateway->
 755                                                 lp_health_sensitivity;
 756                                         *alive    = lnet_is_route_alive(route);
 757                                         lnet_net_unlock(cpt);
 758                                         return 0;
 759                                 }
 760                         }
 761                 }
 762         }
 763
 764         lnet_net_unlock(cpt);
 765         return -ENOENT;
 766 }
 767
 768 static void
 769 lnet_wait_known_routerstate(void)
 770 {
 771         struct lnet_peer *rtr;
 772         struct list_head *entry;
 773         int all_known;
 774
 775         LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
 776
 777         for (;;) {
 778                 int cpt = lnet_net_lock_current();
 779
 780                 all_known = 1;
 781                 list_for_each(entry, &the_lnet.ln_routers) {
 782                         rtr = list_entry(entry, struct lnet_peer,
 783                                          lp_rtr_list);
 784
 785                         spin_lock(&rtr->lp_lock);
 786
 787                         if ((rtr->lp_state & LNET_PEER_DISCOVERED) == 0) {
 788                                 all_known = 0;
 789                                 spin_unlock(&rtr->lp_lock);
 790                                 break;
 791                         }
 792                         spin_unlock(&rtr->lp_lock);
 793                 }
 794
 795                 lnet_net_unlock(cpt);
 796
 797                 if (all_known)
 798                         return;
 799
 800                 set_current_state(TASK_UNINTERRUPTIBLE);
 801                 schedule_timeout(cfs_time_seconds(1));
 802         }
 803 }
 804
 805 static inline bool
 806 lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
 807 {
 808         struct lnet_ni *ni;
 809         bool update = false;
 810
 811         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 812                 lnet_ni_lock(ni);
 813                 if (ni->ni_status &&
 814                     ni->ni_status->ns_status != status) {
 815                     ni->ni_status->ns_status = status;
 816                     update = true;
 817                 }
 818                 lnet_ni_unlock(ni);
 819         }
 820
 821         return update;
 822 }
 823
 824 static bool
 825 lnet_update_ni_status_locked(void)
 826 {
 827         struct lnet_net *net;
 828         bool push = false;
 829         time64_t now;
 830         time64_t timeout;
 831
 832         LASSERT(the_lnet.ln_routing);
 833
 834         timeout = router_ping_timeout + alive_router_check_interval;
 835
 836         now = ktime_get_real_seconds();
 837         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 838                 if (net->net_lnd->lnd_type == LOLND)
 839                         continue;
 840
 841                 if (now < net->net_last_alive + timeout)
 842                         continue;
 843
 844                 spin_lock(&net->net_lock);
 845                 /* re-check with lock */
 846                 if (now < net->net_last_alive + timeout) {
 847                         spin_unlock(&net->net_lock);
 848                         continue;
 849                 }
 850                 spin_unlock(&net->net_lock);
 851
 852                 /*
 853                  * if the net didn't receive any traffic for past the
 854                  * timeout on any of its constituent NIs, then mark all
 855                  * the NIs down.
 856                  */
 857                 push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN);
 858         }
 859
 860         return push;
 861 }
 862
 863 void lnet_wait_router_start(void)
 864 {
 865         if (check_routers_before_use) {
 866                 /* Note that a helpful side-effect of pinging all known routers
 867                  * at startup is that it makes them drop stale connections they
 868                  * may have to a previous instance of me. */
 869                 lnet_wait_known_routerstate();
 870         }
 871 }
 872
 873 /*
 874  * This function is called from the monitor thread to check if there are
 875  * any active routers that need to be checked.
 876  */
 877 inline bool
 878 lnet_router_checker_active(void)
 879 {
 880         /* Router Checker thread needs to run when routing is enabled in
 881          * order to call lnet_update_ni_status_locked() */
 882         if (the_lnet.ln_routing)
 883                 return true;
 884
 885         return !list_empty(&the_lnet.ln_routers) &&
 886                 alive_router_check_interval > 0;
 887 }
 888
 889 void
 890 lnet_check_routers(void)
 891 {
 892         struct lnet_peer_net *first_lpn = NULL;
 893         struct lnet_peer_net *lpn;
 894         struct lnet_peer_ni *lpni;
 895         struct list_head *entry;
 896         struct lnet_peer *rtr;
 897         bool push = false;
 898         bool found_lpn;
 899         __u64 version;
 900         __u32 net_id;
 901         time64_t now;
 902         int cpt;
 903         int rc;
 904
 905         cpt = lnet_net_lock_current();
 906 rescan:
 907         version = the_lnet.ln_routers_version;
 908
 909         list_for_each(entry, &the_lnet.ln_routers) {
 910                 rtr = list_entry(entry, struct lnet_peer,
 911                                  lp_rtr_list);
 912
 913                 now = ktime_get_real_seconds();
 914
 915                 /*
 916                  * only discover the router if we've passed
 917                  * alive_router_check_interval seconds. Some of the router
 918                  * interfaces could be down and in that case they would be
 919                  * undergoing recovery separately from this discovery.
 920                  */
 921                 /* find next peer net which is also local */
 922                 net_id = rtr->lp_disc_net_id;
 923                 do {
 924                         lpn = lnet_get_next_peer_net_locked(rtr, net_id);
 925                         if (!lpn) {
 926                                 CERROR("gateway %s has no networks\n",
 927                                 libcfs_nid2str(rtr->lp_primary_nid));
 928                                 break;
 929                         }
 930                         if (first_lpn == lpn)
 931                                 break;
 932                         if (!first_lpn)
 933                                 first_lpn = lpn;
 934                         found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id);
 935                         net_id = lpn->lpn_net_id;
 936                 } while (!found_lpn);
 937
 938                 if (!found_lpn || !lpn) {
 939                         CERROR("no local network found for gateway %s\n",
 940                                libcfs_nid2str(rtr->lp_primary_nid));
 941                         continue;
 942                 }
 943
 944                 if (now - lpn->lpn_rtrcheck_timestamp <
 945                     alive_router_check_interval / lnet_current_net_count)
 946                        continue;
 947
 948                 /*
 949                  * If we're currently discovering the peer then don't
 950                  * issue another discovery
 951                  */
 952                 spin_lock(&rtr->lp_lock);
 953                 if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) {
 954                         spin_unlock(&rtr->lp_lock);
 955                         continue;
 956                 }
 957                 /* make sure we actively discover the router */
 958                 rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
 959                 rtr->lp_state |= LNET_PEER_RTR_DISCOVERY;
 960                 spin_unlock(&rtr->lp_lock);
 961
 962                 /* find the peer_ni associated with the primary NID */
 963                 lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid);
 964                 if (!lpni) {
 965                         CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
 966                                libcfs_nid2str(rtr->lp_primary_nid));
 967                         continue;
 968                 }
 969                 lnet_peer_ni_addref_locked(lpni);
 970
 971                 /* specify the net to use */
 972                 rtr->lp_disc_net_id = lpn->lpn_net_id;
 973
 974                 /* discover the router */
 975                 CDEBUG(D_NET, "discover %s, cpt = %d\n",
 976                        libcfs_nid2str(lpni->lpni_nid), cpt);
 977                 rc = lnet_discover_peer_locked(lpni, cpt, false);
 978
 979                 /* decrement ref count acquired by find_peer_ni_locked() */
 980                 lnet_peer_ni_decref_locked(lpni);
 981
 982                 if (!rc)
 983                         lpn->lpn_rtrcheck_timestamp = now;
 984                 else
 985                         CERROR("Failed to discover router %s\n",
 986                                libcfs_nid2str(rtr->lp_primary_nid));
 987
 988                 /* NB dropped lock */
 989                 if (version != the_lnet.ln_routers_version) {
 990                         /* the routers list has changed */
 991                         goto rescan;
 992                 }
 993         }
 994
 995         if (the_lnet.ln_routing)
 996                 push = lnet_update_ni_status_locked();
 997
 998         lnet_net_unlock(cpt);
 999
1000         /* if the status of the ni changed update the peers */
1001         if (push)
1002                 lnet_push_update_to_peers(1);
1003 }
1004
1005 void
1006 lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
1007 {
1008         int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1009
1010         while (--npages >= 0)
1011                 __free_page(rb->rb_kiov[npages].kiov_page);
1012
1013         LIBCFS_FREE(rb, sz);
1014 }
1015
1016 static struct lnet_rtrbuf *
1017 lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
1018 {
1019         int            npages = rbp->rbp_npages;
1020         int            sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
1021         struct page   *page;
1022         struct lnet_rtrbuf *rb;
1023         int            i;
1024
1025         LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
1026         if (rb == NULL)
1027                 return NULL;
1028
1029         rb->rb_pool = rbp;
1030
1031         for (i = 0; i < npages; i++) {
1032                 page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1033                                           GFP_KERNEL | __GFP_ZERO);
1034                 if (page == NULL) {
1035                         while (--i >= 0)
1036                                 __free_page(rb->rb_kiov[i].kiov_page);
1037
1038                         LIBCFS_FREE(rb, sz);
1039                         return NULL;
1040                 }
1041
1042                 rb->rb_kiov[i].kiov_len = PAGE_SIZE;
1043                 rb->rb_kiov[i].kiov_offset = 0;
1044                 rb->rb_kiov[i].kiov_page = page;
1045         }
1046
1047         return rb;
1048 }
1049
1050 static void
1051 lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
1052 {
1053         int npages = rbp->rbp_npages;
1054         struct lnet_rtrbuf *rb;
1055         struct list_head tmp;
1056
1057         if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
1058                 return;
1059
1060         INIT_LIST_HEAD(&tmp);
1061
1062         lnet_net_lock(cpt);
1063         list_splice_init(&rbp->rbp_msgs, &tmp);
1064         lnet_drop_routed_msgs_locked(&tmp, cpt);
1065         list_splice_init(&rbp->rbp_bufs, &tmp);
1066         rbp->rbp_req_nbuffers = 0;
1067         rbp->rbp_nbuffers = rbp->rbp_credits = 0;
1068         rbp->rbp_mincredits = 0;
1069         lnet_net_unlock(cpt);
1070
1071         /* Free buffers on the free list. */
1072         while (!list_empty(&tmp)) {
1073                 rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
1074                 list_del(&rb->rb_list);
1075                 lnet_destroy_rtrbuf(rb, npages);
1076         }
1077 }
1078
1079 static int
1080 lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
1081 {
1082         struct list_head rb_list;
1083         struct lnet_rtrbuf *rb;
1084         int             num_rb;
1085         int             num_buffers = 0;
1086         int             old_req_nbufs;
1087         int             npages = rbp->rbp_npages;
1088
1089         lnet_net_lock(cpt);
1090         /* If we are called for less buffers than already in the pool, we
1091          * just lower the req_nbuffers number and excess buffers will be
1092          * thrown away as they are returned to the free list.  Credits
1093          * then get adjusted as well.
1094          * If we already have enough buffers allocated to serve the
1095          * increase requested, then we can treat that the same way as we
1096          * do the decrease. */
1097         num_rb = nbufs - rbp->rbp_nbuffers;
1098         if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
1099                 rbp->rbp_req_nbuffers = nbufs;
1100                 lnet_net_unlock(cpt);
1101                 return 0;
1102         }
1103         /* store the older value of rbp_req_nbuffers and then set it to
1104          * the new request to prevent lnet_return_rx_credits_locked() from
1105          * freeing buffers that we need to keep around */
1106         old_req_nbufs = rbp->rbp_req_nbuffers;
1107         rbp->rbp_req_nbuffers = nbufs;
1108         lnet_net_unlock(cpt);
1109
1110         INIT_LIST_HEAD(&rb_list);
1111
1112         /* allocate the buffers on a local list first.  If all buffers are
1113          * allocated successfully then join this list to the rbp buffer
1114          * list.  If not then free all allocated buffers. */
1115         while (num_rb-- > 0) {
1116                 rb = lnet_new_rtrbuf(rbp, cpt);
1117                 if (rb == NULL) {
1118                         CERROR("Failed to allocate %d route bufs of %d pages\n",
1119                                nbufs, npages);
1120
1121                         lnet_net_lock(cpt);
1122                         rbp->rbp_req_nbuffers = old_req_nbufs;
1123                         lnet_net_unlock(cpt);
1124
1125                         goto failed;
1126                 }
1127
1128                 list_add(&rb->rb_list, &rb_list);
1129                 num_buffers++;
1130         }
1131
1132         lnet_net_lock(cpt);
1133
1134         list_splice_tail(&rb_list, &rbp->rbp_bufs);
1135         rbp->rbp_nbuffers += num_buffers;
1136         rbp->rbp_credits += num_buffers;
1137         rbp->rbp_mincredits = rbp->rbp_credits;
1138         /* We need to schedule blocked msg using the newly
1139          * added buffers. */
1140         while (!list_empty(&rbp->rbp_bufs) &&
1141                !list_empty(&rbp->rbp_msgs))
1142                 lnet_schedule_blocked_locked(rbp);
1143
1144         lnet_net_unlock(cpt);
1145
1146         return 0;
1147
1148 failed:
1149         while (!list_empty(&rb_list)) {
1150                 rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
1151                 list_del(&rb->rb_list);
1152                 lnet_destroy_rtrbuf(rb, npages);
1153         }
1154
1155         return -ENOMEM;
1156 }
1157
1158 static void
1159 lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
1160 {
1161         INIT_LIST_HEAD(&rbp->rbp_msgs);
1162         INIT_LIST_HEAD(&rbp->rbp_bufs);
1163
1164         rbp->rbp_npages = npages;
1165         rbp->rbp_credits = 0;
1166         rbp->rbp_mincredits = 0;
1167 }
1168
1169 void
1170 lnet_rtrpools_free(int keep_pools)
1171 {
1172         struct lnet_rtrbufpool *rtrp;
1173         int               i;
1174
1175         if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
1176                 return;
1177
1178         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1179                 lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
1180                 lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
1181                 lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
1182         }
1183
1184         if (!keep_pools) {
1185                 cfs_percpt_free(the_lnet.ln_rtrpools);
1186                 the_lnet.ln_rtrpools = NULL;
1187         }
1188 }
1189
1190 static int
1191 lnet_nrb_tiny_calculate(void)
1192 {
1193         int     nrbs = LNET_NRB_TINY;
1194
1195         if (tiny_router_buffers < 0) {
1196                 LCONSOLE_ERROR_MSG(0x10c,
1197                                    "tiny_router_buffers=%d invalid when "
1198                                    "routing enabled\n", tiny_router_buffers);
1199                 return -EINVAL;
1200         }
1201
1202         if (tiny_router_buffers > 0)
1203                 nrbs = tiny_router_buffers;
1204
1205         nrbs /= LNET_CPT_NUMBER;
1206         return max(nrbs, LNET_NRB_TINY_MIN);
1207 }
1208
1209 static int
1210 lnet_nrb_small_calculate(void)
1211 {
1212         int     nrbs = LNET_NRB_SMALL;
1213
1214         if (small_router_buffers < 0) {
1215                 LCONSOLE_ERROR_MSG(0x10c,
1216                                    "small_router_buffers=%d invalid when "
1217                                    "routing enabled\n", small_router_buffers);
1218                 return -EINVAL;
1219         }
1220
1221         if (small_router_buffers > 0)
1222                 nrbs = small_router_buffers;
1223
1224         nrbs /= LNET_CPT_NUMBER;
1225         return max(nrbs, LNET_NRB_SMALL_MIN);
1226 }
1227
1228 static int
1229 lnet_nrb_large_calculate(void)
1230 {
1231         int     nrbs = LNET_NRB_LARGE;
1232
1233         if (large_router_buffers < 0) {
1234                 LCONSOLE_ERROR_MSG(0x10c,
1235                                    "large_router_buffers=%d invalid when "
1236                                    "routing enabled\n", large_router_buffers);
1237                 return -EINVAL;
1238         }
1239
1240         if (large_router_buffers > 0)
1241                 nrbs = large_router_buffers;
1242
1243         nrbs /= LNET_CPT_NUMBER;
1244         return max(nrbs, LNET_NRB_LARGE_MIN);
1245 }
1246
1247 int
1248 lnet_rtrpools_alloc(int im_a_router)
1249 {
1250         struct lnet_rtrbufpool *rtrp;
1251         int     nrb_tiny;
1252         int     nrb_small;
1253         int     nrb_large;
1254         int     rc;
1255         int     i;
1256
1257         if (!strcmp(forwarding, "")) {
1258                 /* not set either way */
1259                 if (!im_a_router)
1260                         return 0;
1261         } else if (!strcmp(forwarding, "disabled")) {
1262                 /* explicitly disabled */
1263                 return 0;
1264         } else if (!strcmp(forwarding, "enabled")) {
1265                 /* explicitly enabled */
1266         } else {
1267                 LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
1268                                    "'enabled' or 'disabled'\n");
1269                 return -EINVAL;
1270         }
1271
1272         nrb_tiny = lnet_nrb_tiny_calculate();
1273         if (nrb_tiny < 0)
1274                 return -EINVAL;
1275
1276         nrb_small = lnet_nrb_small_calculate();
1277         if (nrb_small < 0)
1278                 return -EINVAL;
1279
1280         nrb_large = lnet_nrb_large_calculate();
1281         if (nrb_large < 0)
1282                 return -EINVAL;
1283
1284         the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
1285                                                 LNET_NRBPOOLS *
1286                                                 sizeof(struct lnet_rtrbufpool));
1287         if (the_lnet.ln_rtrpools == NULL) {
1288                 LCONSOLE_ERROR_MSG(0x10c,
1289                                    "Failed to initialize router buffe pool\n");
1290                 return -ENOMEM;
1291         }
1292
1293         cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1294                 lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
1295                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1296                                               nrb_tiny, i);
1297                 if (rc != 0)
1298                         goto failed;
1299
1300                 lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
1301                                   LNET_NRB_SMALL_PAGES);
1302                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1303                                               nrb_small, i);
1304                 if (rc != 0)
1305                         goto failed;
1306
1307                 lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
1308                                   LNET_NRB_LARGE_PAGES);
1309                 rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1310                                               nrb_large, i);
1311                 if (rc != 0)
1312                         goto failed;
1313         }
1314
1315         lnet_net_lock(LNET_LOCK_EX);
1316         the_lnet.ln_routing = 1;
1317         lnet_net_unlock(LNET_LOCK_EX);
1318         wake_up(&the_lnet.ln_mt_waitq);
1319         return 0;
1320
1321  failed:
1322         lnet_rtrpools_free(0);
1323         return rc;
1324 }
1325
1326 static int
1327 lnet_rtrpools_adjust_helper(int tiny, int small, int large)
1328 {
1329         int nrb = 0;
1330         int rc = 0;
1331         int i;
1332         struct lnet_rtrbufpool *rtrp;
1333
1334         /* If the provided values for each buffer pool are different than the
1335          * configured values, we need to take action. */
1336         if (tiny >= 0) {
1337                 tiny_router_buffers = tiny;
1338                 nrb = lnet_nrb_tiny_calculate();
1339                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1340                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
1341                                                       nrb, i);
1342                         if (rc != 0)
1343                                 return rc;
1344                 }
1345         }
1346         if (small >= 0) {
1347                 small_router_buffers = small;
1348                 nrb = lnet_nrb_small_calculate();
1349                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1350                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
1351                                                       nrb, i);
1352                         if (rc != 0)
1353                                 return rc;
1354                 }
1355         }
1356         if (large >= 0) {
1357                 large_router_buffers = large;
1358                 nrb = lnet_nrb_large_calculate();
1359                 cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
1360                         rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
1361                                                       nrb, i);
1362                         if (rc != 0)
1363                                 return rc;
1364                 }
1365         }
1366
1367         return 0;
1368 }
1369
1370 int
1371 lnet_rtrpools_adjust(int tiny, int small, int large)
1372 {
1373         /* this function doesn't revert the changes if adding new buffers
1374          * failed.  It's up to the user space caller to revert the
1375          * changes. */
1376
1377         if (!the_lnet.ln_routing)
1378                 return 0;
1379
1380         return lnet_rtrpools_adjust_helper(tiny, small, large);
1381 }
1382
1383 int
1384 lnet_rtrpools_enable(void)
1385 {
1386         int rc = 0;
1387
1388         if (the_lnet.ln_routing)
1389                 return 0;
1390
1391         if (the_lnet.ln_rtrpools == NULL)
1392                 /* If routing is turned off, and we have never
1393                  * initialized the pools before, just call the
1394                  * standard buffer pool allocation routine as
1395                  * if we are just configuring this for the first
1396                  * time. */
1397                 rc = lnet_rtrpools_alloc(1);
1398         else
1399                 rc = lnet_rtrpools_adjust_helper(0, 0, 0);
1400         if (rc != 0)
1401                 return rc;
1402
1403         lnet_net_lock(LNET_LOCK_EX);
1404         the_lnet.ln_routing = 1;
1405
1406         the_lnet.ln_ping_target->pb_info.pi_features &=
1407                 ~LNET_PING_FEAT_RTE_DISABLED;
1408         lnet_net_unlock(LNET_LOCK_EX);
1409
1410         return rc;
1411 }
1412
1413 void
1414 lnet_rtrpools_disable(void)
1415 {
1416         if (!the_lnet.ln_routing)
1417                 return;
1418
1419         lnet_net_lock(LNET_LOCK_EX);
1420         the_lnet.ln_routing = 0;
1421         the_lnet.ln_ping_target->pb_info.pi_features |=
1422                 LNET_PING_FEAT_RTE_DISABLED;
1423
1424         tiny_router_buffers = 0;
1425         small_router_buffers = 0;
1426         large_router_buffers = 0;
1427         lnet_net_unlock(LNET_LOCK_EX);
1428         lnet_rtrpools_free(1);
1429 }
1430
1431 static inline void
1432 lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid)
1433 {
1434         if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL)
1435                 (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid);
1436 }
1437
1438 /*
1439  * ni: local NI used to communicate with the peer
1440  * nid: peer NID
1441  * alive: true if peer is alive, false otherwise
1442  * reset: reset health value. This is requested by the LND.
1443  * when: notificaiton time.
1444  */
1445 int
1446 lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
1447             time64_t when)
1448 {
1449         struct lnet_peer_ni *lpni = NULL;
1450         time64_t now = ktime_get_seconds();
1451         int cpt;
1452
1453         LASSERT (!in_interrupt ());
1454
1455         CDEBUG (D_NET, "%s notifying %s: %s\n",
1456                 (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1457                 libcfs_nid2str(nid),
1458                 alive ? "up" : "down");
1459
1460         if (ni != NULL &&
1461             LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
1462                 CWARN("Ignoring notification of %s %s by %s (different net)\n",
1463                       libcfs_nid2str(nid), alive ? "birth" : "death",
1464                       libcfs_nid2str(ni->ni_nid));
1465                 return -EINVAL;
1466         }
1467
1468         /* can't do predictions... */
1469         if (when > now) {
1470                 CWARN("Ignoring prediction from %s of %s %s "
1471                       "%lld seconds in the future\n",
1472                       (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
1473                       libcfs_nid2str(nid), alive ? "up" : "down", when - now);
1474                 return -EINVAL;
1475         }
1476
1477         if (ni != NULL && !alive &&             /* LND telling me she's down */
1478             !auto_down) {                       /* auto-down disabled */
1479                 CDEBUG(D_NET, "Auto-down disabled\n");
1480                 return 0;
1481         }
1482
1483         /* must lock 0 since this is used for synchronization */
1484         lnet_net_lock(0);
1485
1486         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
1487                 lnet_net_unlock(0);
1488                 return -ESHUTDOWN;
1489         }
1490
1491         lpni = lnet_find_peer_ni_locked(nid);
1492         if (lpni == NULL) {
1493                 /* nid not found */
1494                 lnet_net_unlock(0);
1495                 CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
1496                 return 0;
1497         }
1498
1499         if (alive) {
1500                 if (reset)
1501                         lnet_set_healthv(&lpni->lpni_healthv,
1502                                          LNET_MAX_HEALTH_VALUE);
1503                 else
1504                         lnet_inc_healthv(&lpni->lpni_healthv);
1505         } else {
1506                 lnet_handle_remote_failure_locked(lpni);
1507         }
1508
1509         /* recalculate aliveness */
1510         alive = lnet_is_peer_ni_alive(lpni);
1511         lnet_net_unlock(0);
1512
1513         if (ni != NULL && !alive)
1514                 lnet_notify_peer_down(ni, lpni->lpni_nid);
1515
1516         cpt = lpni->lpni_cpt;
1517         lnet_net_lock(cpt);
1518         lnet_peer_ni_decref_locked(lpni);
1519         lnet_net_unlock(cpt);
1520
1521         return 0;
1522 }
1523 EXPORT_SYMBOL(lnet_notify);