lnet/lnet/api-ni.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LNET
  34
  35 #include <linux/ctype.h>
  36 #include <linux/log2.h>
  37 #include <linux/ktime.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/uaccess.h>
  40 #ifdef HAVE_SCHED_HEADERS
  41 #include <linux/sched/signal.h>
  42 #endif
  43
  44 #include <lnet/lib-lnet.h>
  45
  46 #define D_LNI D_CONSOLE
  47
  48 /*
  49  * initialize ln_api_mutex statically, since it needs to be used in
  50  * discovery_set callback. That module parameter callback can be called
  51  * before module init completes. The mutex needs to be ready for use then.
  52  */
  53 struct lnet the_lnet = {
  54         .ln_api_mutex = __MUTEX_INITIALIZER(the_lnet.ln_api_mutex),
  55 };              /* THE state of the network */
  56 EXPORT_SYMBOL(the_lnet);
  57
  58 static char *ip2nets = "";
  59 module_param(ip2nets, charp, 0444);
  60 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  61
  62 static char *networks = "";
  63 module_param(networks, charp, 0444);
  64 MODULE_PARM_DESC(networks, "local networks");
  65
  66 static char *routes = "";
  67 module_param(routes, charp, 0444);
  68 MODULE_PARM_DESC(routes, "routes to non-local networks");
  69
  70 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  71 module_param(rnet_htable_size, int, 0444);
  72 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
  73
  74 static int use_tcp_bonding = false;
  75 module_param(use_tcp_bonding, int, 0444);
  76 MODULE_PARM_DESC(use_tcp_bonding,
  77                  "Set to 1 to use socklnd bonding. 0 to use Multi-Rail");
  78
  79 unsigned int lnet_numa_range = 0;
  80 module_param(lnet_numa_range, uint, 0444);
  81 MODULE_PARM_DESC(lnet_numa_range,
  82                 "NUMA range to consider during Multi-Rail selection");
  83
  84 /*
  85  * lnet_health_sensitivity determines by how much we decrement the health
  86  * value on sending error. The value defaults to 100, which means health
  87  * interface health is decremented by 100 points every failure.
  88  */
  89 unsigned int lnet_health_sensitivity = 100;
  90 static int sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
  91 #ifdef HAVE_KERNEL_PARAM_OPS
  92 static struct kernel_param_ops param_ops_health_sensitivity = {
  93         .set = sensitivity_set,
  94         .get = param_get_int,
  95 };
  96 #define param_check_health_sensitivity(name, p) \
  97                 __param_check(name, p, int)
  98 module_param(lnet_health_sensitivity, health_sensitivity, S_IRUGO|S_IWUSR);
  99 #else
 100 module_param_call(lnet_health_sensitivity, sensitivity_set, param_get_int,
 101                   &lnet_health_sensitivity, S_IRUGO|S_IWUSR);
 102 #endif
 103 MODULE_PARM_DESC(lnet_health_sensitivity,
 104                 "Value to decrement the health value by on error");
 105
 106 /*
 107  * lnet_recovery_interval determines how often we should perform recovery
 108  * on unhealthy interfaces.
 109  */
 110 unsigned int lnet_recovery_interval = 1;
 111 static int recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp);
 112 #ifdef HAVE_KERNEL_PARAM_OPS
 113 static struct kernel_param_ops param_ops_recovery_interval = {
 114         .set = recovery_interval_set,
 115         .get = param_get_int,
 116 };
 117 #define param_check_recovery_interval(name, p) \
 118                 __param_check(name, p, int)
 119 module_param(lnet_recovery_interval, recovery_interval, S_IRUGO|S_IWUSR);
 120 #else
 121 module_param_call(lnet_recovery_interval, recovery_interval_set, param_get_int,
 122                   &lnet_recovery_interval, S_IRUGO|S_IWUSR);
 123 #endif
 124 MODULE_PARM_DESC(lnet_recovery_interval,
 125                 "Interval to recover unhealthy interfaces in seconds");
 126
 127 static int lnet_interfaces_max = LNET_INTERFACES_MAX_DEFAULT;
 128 static int intf_max_set(const char *val, cfs_kernel_param_arg_t *kp);
 129
 130 static struct kernel_param_ops param_ops_interfaces_max = {
 131         .set = intf_max_set,
 132         .get = param_get_int,
 133 };
 134
 135 #define param_check_interfaces_max(name, p) \
 136                 __param_check(name, p, int)
 137
 138 #ifdef HAVE_KERNEL_PARAM_OPS
 139 module_param(lnet_interfaces_max, interfaces_max, 0644);
 140 #else
 141 module_param_call(lnet_interfaces_max, intf_max_set, param_get_int,
 142                   &param_ops_interfaces_max, 0644);
 143 #endif
 144 MODULE_PARM_DESC(lnet_interfaces_max,
 145                 "Maximum number of interfaces in a node.");
 146
 147 unsigned lnet_peer_discovery_disabled = 0;
 148 static int discovery_set(const char *val, cfs_kernel_param_arg_t *kp);
 149
 150 static struct kernel_param_ops param_ops_discovery_disabled = {
 151         .set = discovery_set,
 152         .get = param_get_int,
 153 };
 154
 155 #define param_check_discovery_disabled(name, p) \
 156                 __param_check(name, p, int)
 157 #ifdef HAVE_KERNEL_PARAM_OPS
 158 module_param(lnet_peer_discovery_disabled, discovery_disabled, 0644);
 159 #else
 160 module_param_call(lnet_peer_discovery_disabled, discovery_set, param_get_int,
 161                   &param_ops_discovery_disabled, 0644);
 162 #endif
 163 MODULE_PARM_DESC(lnet_peer_discovery_disabled,
 164                 "Set to 1 to disable peer discovery on this node.");
 165
 166 unsigned int lnet_drop_asym_route;
 167 static int drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp);
 168
 169 static struct kernel_param_ops param_ops_drop_asym_route = {
 170         .set = drop_asym_route_set,
 171         .get = param_get_int,
 172 };
 173
 174 #define param_check_drop_asym_route(name, p)    \
 175         __param_check(name, p, int)
 176 #ifdef HAVE_KERNEL_PARAM_OPS
 177 module_param(lnet_drop_asym_route, drop_asym_route, 0644);
 178 #else
 179 module_param_call(lnet_drop_asym_route, drop_asym_route_set, param_get_int,
 180                   &param_ops_drop_asym_route, 0644);
 181 #endif
 182 MODULE_PARM_DESC(lnet_drop_asym_route,
 183                  "Set to 1 to drop asymmetrical route messages.");
 184
 185 #define LNET_TRANSACTION_TIMEOUT_NO_HEALTH_DEFAULT 50
 186 #define LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT 50
 187
 188 unsigned lnet_transaction_timeout = LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT;
 189 static int transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp);
 190 #ifdef HAVE_KERNEL_PARAM_OPS
 191 static struct kernel_param_ops param_ops_transaction_timeout = {
 192         .set = transaction_to_set,
 193         .get = param_get_int,
 194 };
 195
 196 #define param_check_transaction_timeout(name, p) \
 197                 __param_check(name, p, int)
 198 module_param(lnet_transaction_timeout, transaction_timeout, S_IRUGO|S_IWUSR);
 199 #else
 200 module_param_call(lnet_transaction_timeout, transaction_to_set, param_get_int,
 201                   &lnet_transaction_timeout, S_IRUGO|S_IWUSR);
 202 #endif
 203 MODULE_PARM_DESC(lnet_transaction_timeout,
 204                 "Maximum number of seconds to wait for a peer response.");
 205
 206 #define LNET_RETRY_COUNT_HEALTH_DEFAULT 2
 207 unsigned lnet_retry_count = LNET_RETRY_COUNT_HEALTH_DEFAULT;
 208 static int retry_count_set(const char *val, cfs_kernel_param_arg_t *kp);
 209 #ifdef HAVE_KERNEL_PARAM_OPS
 210 static struct kernel_param_ops param_ops_retry_count = {
 211         .set = retry_count_set,
 212         .get = param_get_int,
 213 };
 214
 215 #define param_check_retry_count(name, p) \
 216                 __param_check(name, p, int)
 217 module_param(lnet_retry_count, retry_count, S_IRUGO|S_IWUSR);
 218 #else
 219 module_param_call(lnet_retry_count, retry_count_set, param_get_int,
 220                   &lnet_retry_count, S_IRUGO|S_IWUSR);
 221 #endif
 222 MODULE_PARM_DESC(lnet_retry_count,
 223                  "Maximum number of times to retry transmitting a message");
 224
 225
 226 unsigned lnet_lnd_timeout = LNET_LND_DEFAULT_TIMEOUT;
 227 unsigned int lnet_current_net_count;
 228
 229 /*
 230  * This sequence number keeps track of how many times DLC was used to
 231  * update the local NIs. It is incremented when a NI is added or
 232  * removed and checked when sending a message to determine if there is
 233  * a need to re-run the selection algorithm. See lnet_select_pathway()
 234  * for more details on its usage.
 235  */
 236 static atomic_t lnet_dlc_seq_no = ATOMIC_INIT(0);
 237
 238 static int lnet_ping(struct lnet_process_id id, signed long timeout,
 239                      struct lnet_process_id __user *ids, int n_ids);
 240
 241 static int lnet_discover(struct lnet_process_id id, __u32 force,
 242                          struct lnet_process_id __user *ids, int n_ids);
 243
 244 static int
 245 sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
 246 {
 247         int rc;
 248         unsigned *sensitivity = (unsigned *)kp->arg;
 249         unsigned long value;
 250
 251         rc = kstrtoul(val, 0, &value);
 252         if (rc) {
 253                 CERROR("Invalid module parameter value for 'lnet_health_sensitivity'\n");
 254                 return rc;
 255         }
 256
 257         /*
 258          * The purpose of locking the api_mutex here is to ensure that
 259          * the correct value ends up stored properly.
 260          */
 261         mutex_lock(&the_lnet.ln_api_mutex);
 262
 263         if (value > LNET_MAX_HEALTH_VALUE) {
 264                 mutex_unlock(&the_lnet.ln_api_mutex);
 265                 CERROR("Invalid health value. Maximum: %d value = %lu\n",
 266                        LNET_MAX_HEALTH_VALUE, value);
 267                 return -EINVAL;
 268         }
 269
 270         /*
 271          * if we're turning on health then use the health timeout
 272          * defaults.
 273          */
 274         if (*sensitivity == 0 && value != 0) {
 275                 lnet_transaction_timeout = LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT;
 276                 lnet_retry_count = LNET_RETRY_COUNT_HEALTH_DEFAULT;
 277         /*
 278          * if we're turning off health then use the no health timeout
 279          * default.
 280          */
 281         } else if (*sensitivity != 0 && value == 0) {
 282                 lnet_transaction_timeout =
 283                         LNET_TRANSACTION_TIMEOUT_NO_HEALTH_DEFAULT;
 284                 lnet_retry_count = 0;
 285         }
 286
 287         *sensitivity = value;
 288
 289         mutex_unlock(&the_lnet.ln_api_mutex);
 290
 291         return 0;
 292 }
 293
 294 static int
 295 recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp)
 296 {
 297         int rc;
 298         unsigned *interval = (unsigned *)kp->arg;
 299         unsigned long value;
 300
 301         rc = kstrtoul(val, 0, &value);
 302         if (rc) {
 303                 CERROR("Invalid module parameter value for 'lnet_recovery_interval'\n");
 304                 return rc;
 305         }
 306
 307         if (value < 1) {
 308                 CERROR("lnet_recovery_interval must be at least 1 second\n");
 309                 return -EINVAL;
 310         }
 311
 312         /*
 313          * The purpose of locking the api_mutex here is to ensure that
 314          * the correct value ends up stored properly.
 315          */
 316         mutex_lock(&the_lnet.ln_api_mutex);
 317
 318         *interval = value;
 319
 320         mutex_unlock(&the_lnet.ln_api_mutex);
 321
 322         return 0;
 323 }
 324
 325 static int
 326 discovery_set(const char *val, cfs_kernel_param_arg_t *kp)
 327 {
 328         int rc;
 329         unsigned *discovery = (unsigned *)kp->arg;
 330         unsigned long value;
 331         struct lnet_ping_buffer *pbuf;
 332
 333         rc = kstrtoul(val, 0, &value);
 334         if (rc) {
 335                 CERROR("Invalid module parameter value for 'lnet_peer_discovery_disabled'\n");
 336                 return rc;
 337         }
 338
 339         value = (value) ? 1 : 0;
 340
 341         /*
 342          * The purpose of locking the api_mutex here is to ensure that
 343          * the correct value ends up stored properly.
 344          */
 345         mutex_lock(&the_lnet.ln_api_mutex);
 346
 347         if (value == *discovery) {
 348                 mutex_unlock(&the_lnet.ln_api_mutex);
 349                 return 0;
 350         }
 351
 352         /*
 353          * We still want to set the discovery value even when LNet is not
 354          * running. This is the case when LNet is being loaded and we want
 355          * the module parameters to take effect. Otherwise if we're
 356          * changing the value dynamically, we want to set it after
 357          * updating the peers
 358          */
 359         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
 360                 *discovery = value;
 361                 mutex_unlock(&the_lnet.ln_api_mutex);
 362                 return 0;
 363         }
 364
 365         /* tell peers that discovery setting has changed */
 366         lnet_net_lock(LNET_LOCK_EX);
 367         pbuf = the_lnet.ln_ping_target;
 368         if (value)
 369                 pbuf->pb_info.pi_features &= ~LNET_PING_FEAT_DISCOVERY;
 370         else
 371                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
 372         lnet_net_unlock(LNET_LOCK_EX);
 373
 374         /*
 375          * Always update the peers. This will result in a push to the
 376          * peers with the updated capabilities feature mask. The peer can
 377          * then take appropriate action to update its representation of
 378          * the node.
 379          *
 380          * If discovery is already off, turn it on first before pushing
 381          * the update. The discovery flag must be on before pushing.
 382          * otherwise if the flag is on and we're turning it off then push
 383          * first before turning the flag off. In the former case the flag
 384          * is being set twice, but I find it's better to do that rather
 385          * than have duplicate code in an if/else statement.
 386          */
 387         if (*discovery > 0 && value == 0)
 388                 *discovery = value;
 389         lnet_push_update_to_peers(1);
 390         *discovery = value;
 391
 392         mutex_unlock(&the_lnet.ln_api_mutex);
 393
 394         return 0;
 395 }
 396
 397 static int
 398 drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp)
 399 {
 400         int rc;
 401         unsigned int *drop_asym_route = (unsigned int *)kp->arg;
 402         unsigned long value;
 403
 404         rc = kstrtoul(val, 0, &value);
 405         if (rc) {
 406                 CERROR("Invalid module parameter value for "
 407                        "'lnet_drop_asym_route'\n");
 408                 return rc;
 409         }
 410
 411         /*
 412          * The purpose of locking the api_mutex here is to ensure that
 413          * the correct value ends up stored properly.
 414          */
 415         mutex_lock(&the_lnet.ln_api_mutex);
 416
 417         if (value == *drop_asym_route) {
 418                 mutex_unlock(&the_lnet.ln_api_mutex);
 419                 return 0;
 420         }
 421
 422         *drop_asym_route = value;
 423
 424         mutex_unlock(&the_lnet.ln_api_mutex);
 425
 426         return 0;
 427 }
 428
 429 static int
 430 transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp)
 431 {
 432         int rc;
 433         unsigned *transaction_to = (unsigned *)kp->arg;
 434         unsigned long value;
 435
 436         rc = kstrtoul(val, 0, &value);
 437         if (rc) {
 438                 CERROR("Invalid module parameter value for 'lnet_transaction_timeout'\n");
 439                 return rc;
 440         }
 441
 442         /*
 443          * The purpose of locking the api_mutex here is to ensure that
 444          * the correct value ends up stored properly.
 445          */
 446         mutex_lock(&the_lnet.ln_api_mutex);
 447
 448         if (value < lnet_retry_count || value == 0) {
 449                 mutex_unlock(&the_lnet.ln_api_mutex);
 450                 CERROR("Invalid value for lnet_transaction_timeout (%lu). "
 451                        "Has to be greater than lnet_retry_count (%u)\n",
 452                        value, lnet_retry_count);
 453                 return -EINVAL;
 454         }
 455
 456         if (value == *transaction_to) {
 457                 mutex_unlock(&the_lnet.ln_api_mutex);
 458                 return 0;
 459         }
 460
 461         *transaction_to = value;
 462         if (lnet_retry_count == 0)
 463                 lnet_lnd_timeout = value;
 464         else
 465                 lnet_lnd_timeout = value / lnet_retry_count;
 466
 467         mutex_unlock(&the_lnet.ln_api_mutex);
 468
 469         return 0;
 470 }
 471
 472 static int
 473 retry_count_set(const char *val, cfs_kernel_param_arg_t *kp)
 474 {
 475         int rc;
 476         unsigned *retry_count = (unsigned *)kp->arg;
 477         unsigned long value;
 478
 479         rc = kstrtoul(val, 0, &value);
 480         if (rc) {
 481                 CERROR("Invalid module parameter value for 'lnet_retry_count'\n");
 482                 return rc;
 483         }
 484
 485         /*
 486          * The purpose of locking the api_mutex here is to ensure that
 487          * the correct value ends up stored properly.
 488          */
 489         mutex_lock(&the_lnet.ln_api_mutex);
 490
 491         if (lnet_health_sensitivity == 0) {
 492                 mutex_unlock(&the_lnet.ln_api_mutex);
 493                 CERROR("Can not set retry_count when health feature is turned off\n");
 494                 return -EINVAL;
 495         }
 496
 497         if (value > lnet_transaction_timeout) {
 498                 mutex_unlock(&the_lnet.ln_api_mutex);
 499                 CERROR("Invalid value for lnet_retry_count (%lu). "
 500                        "Has to be smaller than lnet_transaction_timeout (%u)\n",
 501                        value, lnet_transaction_timeout);
 502                 return -EINVAL;
 503         }
 504
 505         *retry_count = value;
 506
 507         if (value == 0)
 508                 lnet_lnd_timeout = lnet_transaction_timeout;
 509         else
 510                 lnet_lnd_timeout = lnet_transaction_timeout / value;
 511
 512         mutex_unlock(&the_lnet.ln_api_mutex);
 513
 514         return 0;
 515 }
 516
 517 static int
 518 intf_max_set(const char *val, cfs_kernel_param_arg_t *kp)
 519 {
 520         int value, rc;
 521
 522         rc = kstrtoint(val, 0, &value);
 523         if (rc) {
 524                 CERROR("Invalid module parameter value for 'lnet_interfaces_max'\n");
 525                 return rc;
 526         }
 527
 528         if (value < LNET_INTERFACES_MIN) {
 529                 CWARN("max interfaces provided are too small, setting to %d\n",
 530                       LNET_INTERFACES_MAX_DEFAULT);
 531                 value = LNET_INTERFACES_MAX_DEFAULT;
 532         }
 533
 534         *(int *)kp->arg = value;
 535
 536         return 0;
 537 }
 538
 539 static char *
 540 lnet_get_routes(void)
 541 {
 542         return routes;
 543 }
 544
 545 static char *
 546 lnet_get_networks(void)
 547 {
 548         char   *nets;
 549         int     rc;
 550
 551         if (*networks != 0 && *ip2nets != 0) {
 552                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
 553                                    "'ip2nets' but not both at once\n");
 554                 return NULL;
 555         }
 556
 557         if (*ip2nets != 0) {
 558                 rc = lnet_parse_ip2nets(&nets, ip2nets);
 559                 return (rc == 0) ? nets : NULL;
 560         }
 561
 562         if (*networks != 0)
 563                 return networks;
 564
 565         return "tcp";
 566 }
 567
 568 static void
 569 lnet_init_locks(void)
 570 {
 571         spin_lock_init(&the_lnet.ln_eq_wait_lock);
 572         spin_lock_init(&the_lnet.ln_msg_resend_lock);
 573         init_completion(&the_lnet.ln_mt_wait_complete);
 574         mutex_init(&the_lnet.ln_lnd_mutex);
 575 }
 576
 577 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 578 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 579                                             *  MDs kmem_cache */
 580 struct kmem_cache *lnet_rspt_cachep;       /* response tracker cache */
 581 struct kmem_cache *lnet_msg_cachep;
 582
 583 static int
 584 lnet_slab_setup(void)
 585 {
 586         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 587          * allocated in <size-xxx> kmem_cache).
 588          */
 589         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(struct lnet_me),
 590                                             0, 0, NULL);
 591         if (!lnet_mes_cachep)
 592                 return -ENOMEM;
 593
 594         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 595                                                   LNET_SMALL_MD_SIZE, 0, 0,
 596                                                   NULL);
 597         if (!lnet_small_mds_cachep)
 598                 return -ENOMEM;
 599
 600         lnet_rspt_cachep = kmem_cache_create("lnet_rspt", sizeof(struct lnet_rsp_tracker),
 601                                             0, 0, NULL);
 602         if (!lnet_rspt_cachep)
 603                 return -ENOMEM;
 604
 605         lnet_msg_cachep = kmem_cache_create("lnet_msg", sizeof(struct lnet_msg),
 606                                             0, 0, NULL);
 607         if (!lnet_msg_cachep)
 608                 return -ENOMEM;
 609
 610         return 0;
 611 }
 612
 613 static void
 614 lnet_slab_cleanup(void)
 615 {
 616         if (lnet_msg_cachep) {
 617                 kmem_cache_destroy(lnet_msg_cachep);
 618                 lnet_msg_cachep = NULL;
 619         }
 620
 621
 622         if (lnet_rspt_cachep) {
 623                 kmem_cache_destroy(lnet_rspt_cachep);
 624                 lnet_rspt_cachep = NULL;
 625         }
 626
 627         if (lnet_small_mds_cachep) {
 628                 kmem_cache_destroy(lnet_small_mds_cachep);
 629                 lnet_small_mds_cachep = NULL;
 630         }
 631
 632         if (lnet_mes_cachep) {
 633                 kmem_cache_destroy(lnet_mes_cachep);
 634                 lnet_mes_cachep = NULL;
 635         }
 636 }
 637
 638 static int
 639 lnet_create_remote_nets_table(void)
 640 {
 641         int               i;
 642         struct list_head *hash;
 643
 644         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 645         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 646         CFS_ALLOC_PTR_ARRAY(hash, LNET_REMOTE_NETS_HASH_SIZE);
 647         if (hash == NULL) {
 648                 CERROR("Failed to create remote nets hash table\n");
 649                 return -ENOMEM;
 650         }
 651
 652         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 653                 INIT_LIST_HEAD(&hash[i]);
 654         the_lnet.ln_remote_nets_hash = hash;
 655         return 0;
 656 }
 657
 658 static void
 659 lnet_destroy_remote_nets_table(void)
 660 {
 661         int i;
 662
 663         if (the_lnet.ln_remote_nets_hash == NULL)
 664                 return;
 665
 666         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 667                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 668
 669         CFS_FREE_PTR_ARRAY(the_lnet.ln_remote_nets_hash,
 670                            LNET_REMOTE_NETS_HASH_SIZE);
 671         the_lnet.ln_remote_nets_hash = NULL;
 672 }
 673
 674 static void
 675 lnet_destroy_locks(void)
 676 {
 677         if (the_lnet.ln_res_lock != NULL) {
 678                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 679                 the_lnet.ln_res_lock = NULL;
 680         }
 681
 682         if (the_lnet.ln_net_lock != NULL) {
 683                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 684                 the_lnet.ln_net_lock = NULL;
 685         }
 686 }
 687
 688 static int
 689 lnet_create_locks(void)
 690 {
 691         lnet_init_locks();
 692
 693         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 694         if (the_lnet.ln_res_lock == NULL)
 695                 goto failed;
 696
 697         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 698         if (the_lnet.ln_net_lock == NULL)
 699                 goto failed;
 700
 701         return 0;
 702
 703  failed:
 704         lnet_destroy_locks();
 705         return -ENOMEM;
 706 }
 707
 708 static void lnet_assert_wire_constants(void)
 709 {
 710         /* Wire protocol assertions generated by 'wirecheck'
 711          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 712          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 713          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 714
 715         /* Constants... */
 716         BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
 717         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
 718         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
 719         BUILD_BUG_ON(LNET_MSG_ACK != 0);
 720         BUILD_BUG_ON(LNET_MSG_PUT != 1);
 721         BUILD_BUG_ON(LNET_MSG_GET != 2);
 722         BUILD_BUG_ON(LNET_MSG_REPLY != 3);
 723         BUILD_BUG_ON(LNET_MSG_HELLO != 4);
 724
 725         /* Checks for struct lnet_handle_wire */
 726         BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
 727         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 728                                    wh_interface_cookie) != 0);
 729         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
 730         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 731                                    wh_object_cookie) != 8);
 732         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
 733
 734         /* Checks for struct struct lnet_magicversion */
 735         BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
 736         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
 737         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
 738         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
 739         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
 740         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion,
 741                                    version_minor) != 6);
 742         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
 743
 744         /* Checks for struct struct lnet_hdr */
 745         BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
 746         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
 747         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
 748         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
 749         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
 750         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
 751         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
 752         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
 753         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
 754         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
 755         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
 756         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
 757         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
 758         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
 759         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
 760
 761         /* Ack */
 762         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
 763         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
 764         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
 765         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
 766         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
 767         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
 768
 769         /* Put */
 770         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
 771         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
 772         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
 773         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
 774         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
 775         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
 776         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
 777         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
 778         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
 779         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
 780
 781         /* Get */
 782         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
 783         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
 784         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
 785         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
 786         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
 787         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
 788         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
 789         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
 790         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
 791         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
 792
 793         /* Reply */
 794         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
 795         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
 796
 797         /* Hello */
 798         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
 799         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
 800         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
 801         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
 802
 803         /* Checks for struct lnet_ni_status and related constants */
 804         BUILD_BUG_ON(LNET_NI_STATUS_INVALID != 0x00000000);
 805         BUILD_BUG_ON(LNET_NI_STATUS_UP != 0x15aac0de);
 806         BUILD_BUG_ON(LNET_NI_STATUS_DOWN != 0xdeadface);
 807
 808         /* Checks for struct lnet_ni_status */
 809         BUILD_BUG_ON((int)sizeof(struct lnet_ni_status) != 16);
 810         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_nid) != 0);
 811         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_nid) != 8);
 812         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_status) != 8);
 813         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_status) != 4);
 814         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_unused) != 12);
 815         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_unused) != 4);
 816
 817         /* Checks for struct lnet_ping_info and related constants */
 818         BUILD_BUG_ON(LNET_PROTO_PING_MAGIC != 0x70696E67);
 819         BUILD_BUG_ON(LNET_PING_FEAT_INVAL != 0);
 820         BUILD_BUG_ON(LNET_PING_FEAT_BASE != 1);
 821         BUILD_BUG_ON(LNET_PING_FEAT_NI_STATUS != 2);
 822         BUILD_BUG_ON(LNET_PING_FEAT_RTE_DISABLED != 4);
 823         BUILD_BUG_ON(LNET_PING_FEAT_MULTI_RAIL != 8);
 824         BUILD_BUG_ON(LNET_PING_FEAT_DISCOVERY != 16);
 825         BUILD_BUG_ON(LNET_PING_FEAT_BITS != 31);
 826
 827         /* Checks for struct lnet_ping_info */
 828         BUILD_BUG_ON((int)sizeof(struct lnet_ping_info) != 16);
 829         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_magic) != 0);
 830         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_magic) != 4);
 831         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_features) != 4);
 832         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_features) != 4);
 833         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_pid) != 8);
 834         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_pid) != 4);
 835         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_nnis) != 12);
 836         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_nnis) != 4);
 837         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_ni) != 16);
 838         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_ni) != 0);
 839 }
 840
 841 static const struct lnet_lnd *lnet_find_lnd_by_type(__u32 type)
 842 {
 843         const struct lnet_lnd *lnd;
 844
 845         /* holding lnd mutex */
 846         if (type >= NUM_LNDS)
 847                 return NULL;
 848         lnd = the_lnet.ln_lnds[type];
 849         LASSERT(!lnd || lnd->lnd_type == type);
 850
 851         return lnd;
 852 }
 853
 854 unsigned int
 855 lnet_get_lnd_timeout(void)
 856 {
 857         return lnet_lnd_timeout;
 858 }
 859 EXPORT_SYMBOL(lnet_get_lnd_timeout);
 860
 861 void
 862 lnet_register_lnd(const struct lnet_lnd *lnd)
 863 {
 864         mutex_lock(&the_lnet.ln_lnd_mutex);
 865
 866         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 867         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 868
 869         the_lnet.ln_lnds[lnd->lnd_type] = lnd;
 870
 871         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 872
 873         mutex_unlock(&the_lnet.ln_lnd_mutex);
 874 }
 875 EXPORT_SYMBOL(lnet_register_lnd);
 876
 877 void
 878 lnet_unregister_lnd(const struct lnet_lnd *lnd)
 879 {
 880         mutex_lock(&the_lnet.ln_lnd_mutex);
 881
 882         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 883
 884         the_lnet.ln_lnds[lnd->lnd_type] = NULL;
 885         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 886
 887         mutex_unlock(&the_lnet.ln_lnd_mutex);
 888 }
 889 EXPORT_SYMBOL(lnet_unregister_lnd);
 890
 891 void
 892 lnet_counters_get_common(struct lnet_counters_common *common)
 893 {
 894         struct lnet_counters *ctr;
 895         int i;
 896
 897         memset(common, 0, sizeof(*common));
 898
 899         lnet_net_lock(LNET_LOCK_EX);
 900
 901         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 902                 common->lcc_msgs_max     += ctr->lct_common.lcc_msgs_max;
 903                 common->lcc_msgs_alloc   += ctr->lct_common.lcc_msgs_alloc;
 904                 common->lcc_errors       += ctr->lct_common.lcc_errors;
 905                 common->lcc_send_count   += ctr->lct_common.lcc_send_count;
 906                 common->lcc_recv_count   += ctr->lct_common.lcc_recv_count;
 907                 common->lcc_route_count  += ctr->lct_common.lcc_route_count;
 908                 common->lcc_drop_count   += ctr->lct_common.lcc_drop_count;
 909                 common->lcc_send_length  += ctr->lct_common.lcc_send_length;
 910                 common->lcc_recv_length  += ctr->lct_common.lcc_recv_length;
 911                 common->lcc_route_length += ctr->lct_common.lcc_route_length;
 912                 common->lcc_drop_length  += ctr->lct_common.lcc_drop_length;
 913         }
 914         lnet_net_unlock(LNET_LOCK_EX);
 915 }
 916 EXPORT_SYMBOL(lnet_counters_get_common);
 917
 918 void
 919 lnet_counters_get(struct lnet_counters *counters)
 920 {
 921         struct lnet_counters *ctr;
 922         struct lnet_counters_health *health = &counters->lct_health;
 923         int             i;
 924
 925         memset(counters, 0, sizeof(*counters));
 926
 927         lnet_counters_get_common(&counters->lct_common);
 928
 929         lnet_net_lock(LNET_LOCK_EX);
 930
 931         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 932                 health->lch_rst_alloc    += ctr->lct_health.lch_rst_alloc;
 933                 health->lch_resend_count += ctr->lct_health.lch_resend_count;
 934                 health->lch_response_timeout_count +=
 935                                 ctr->lct_health.lch_response_timeout_count;
 936                 health->lch_local_interrupt_count +=
 937                                 ctr->lct_health.lch_local_interrupt_count;
 938                 health->lch_local_dropped_count +=
 939                                 ctr->lct_health.lch_local_dropped_count;
 940                 health->lch_local_aborted_count +=
 941                                 ctr->lct_health.lch_local_aborted_count;
 942                 health->lch_local_no_route_count +=
 943                                 ctr->lct_health.lch_local_no_route_count;
 944                 health->lch_local_timeout_count +=
 945                                 ctr->lct_health.lch_local_timeout_count;
 946                 health->lch_local_error_count +=
 947                                 ctr->lct_health.lch_local_error_count;
 948                 health->lch_remote_dropped_count +=
 949                                 ctr->lct_health.lch_remote_dropped_count;
 950                 health->lch_remote_error_count +=
 951                                 ctr->lct_health.lch_remote_error_count;
 952                 health->lch_remote_timeout_count +=
 953                                 ctr->lct_health.lch_remote_timeout_count;
 954                 health->lch_network_timeout_count +=
 955                                 ctr->lct_health.lch_network_timeout_count;
 956         }
 957         lnet_net_unlock(LNET_LOCK_EX);
 958 }
 959 EXPORT_SYMBOL(lnet_counters_get);
 960
 961 void
 962 lnet_counters_reset(void)
 963 {
 964         struct lnet_counters *counters;
 965         int             i;
 966
 967         lnet_net_lock(LNET_LOCK_EX);
 968
 969         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 970                 memset(counters, 0, sizeof(struct lnet_counters));
 971
 972         lnet_net_unlock(LNET_LOCK_EX);
 973 }
 974
 975 static char *
 976 lnet_res_type2str(int type)
 977 {
 978         switch (type) {
 979         default:
 980                 LBUG();
 981         case LNET_COOKIE_TYPE_MD:
 982                 return "MD";
 983         case LNET_COOKIE_TYPE_ME:
 984                 return "ME";
 985         case LNET_COOKIE_TYPE_EQ:
 986                 return "EQ";
 987         }
 988 }
 989
 990 static void
 991 lnet_res_container_cleanup(struct lnet_res_container *rec)
 992 {
 993         int     count = 0;
 994
 995         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 996                 return;
 997
 998         while (!list_empty(&rec->rec_active)) {
 999                 struct list_head *e = rec->rec_active.next;
1000
1001                 list_del_init(e);
1002                 if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
1003                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
1004
1005                 } else { /* NB: Active MEs should be attached on portals */
1006                         LBUG();
1007                 }
1008                 count++;
1009         }
1010
1011         if (count > 0) {
1012                 /* Found alive MD/ME/EQ, user really should unlink/free
1013                  * all of them before finalize LNet, but if someone didn't,
1014                  * we have to recycle garbage for him */
1015                 CERROR("%d active elements on exit of %s container\n",
1016                        count, lnet_res_type2str(rec->rec_type));
1017         }
1018
1019         if (rec->rec_lh_hash != NULL) {
1020                 CFS_FREE_PTR_ARRAY(rec->rec_lh_hash, LNET_LH_HASH_SIZE);
1021                 rec->rec_lh_hash = NULL;
1022         }
1023
1024         rec->rec_type = 0; /* mark it as finalized */
1025 }
1026
1027 static int
1028 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
1029 {
1030         int     rc = 0;
1031         int     i;
1032
1033         LASSERT(rec->rec_type == 0);
1034
1035         rec->rec_type = type;
1036         INIT_LIST_HEAD(&rec->rec_active);
1037
1038         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
1039
1040         /* Arbitrary choice of hash table size */
1041         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
1042                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
1043         if (rec->rec_lh_hash == NULL) {
1044                 rc = -ENOMEM;
1045                 goto out;
1046         }
1047
1048         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
1049                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
1050
1051         return 0;
1052
1053 out:
1054         CERROR("Failed to setup %s resource container\n",
1055                lnet_res_type2str(type));
1056         lnet_res_container_cleanup(rec);
1057         return rc;
1058 }
1059
1060 static void
1061 lnet_res_containers_destroy(struct lnet_res_container **recs)
1062 {
1063         struct lnet_res_container       *rec;
1064         int                             i;
1065
1066         cfs_percpt_for_each(rec, i, recs)
1067                 lnet_res_container_cleanup(rec);
1068
1069         cfs_percpt_free(recs);
1070 }
1071
1072 static struct lnet_res_container **
1073 lnet_res_containers_create(int type)
1074 {
1075         struct lnet_res_container       **recs;
1076         struct lnet_res_container       *rec;
1077         int                             rc;
1078         int                             i;
1079
1080         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
1081         if (recs == NULL) {
1082                 CERROR("Failed to allocate %s resource containers\n",
1083                        lnet_res_type2str(type));
1084                 return NULL;
1085         }
1086
1087         cfs_percpt_for_each(rec, i, recs) {
1088                 rc = lnet_res_container_setup(rec, i, type);
1089                 if (rc != 0) {
1090                         lnet_res_containers_destroy(recs);
1091                         return NULL;
1092                 }
1093         }
1094
1095         return recs;
1096 }
1097
1098 struct lnet_libhandle *
1099 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
1100 {
1101         /* ALWAYS called with lnet_res_lock held */
1102         struct list_head        *head;
1103         struct lnet_libhandle   *lh;
1104         unsigned int            hash;
1105
1106         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
1107                 return NULL;
1108
1109         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
1110         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
1111
1112         list_for_each_entry(lh, head, lh_hash_chain) {
1113                 if (lh->lh_cookie == cookie)
1114                         return lh;
1115         }
1116
1117         return NULL;
1118 }
1119
1120 void
1121 lnet_res_lh_initialize(struct lnet_res_container *rec,
1122                        struct lnet_libhandle *lh)
1123 {
1124         /* ALWAYS called with lnet_res_lock held */
1125         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
1126         unsigned int    hash;
1127
1128         lh->lh_cookie = rec->rec_lh_cookie;
1129         rec->rec_lh_cookie += 1 << ibits;
1130
1131         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
1132
1133         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
1134 }
1135
1136 struct list_head **
1137 lnet_create_array_of_queues(void)
1138 {
1139         struct list_head **qs;
1140         struct list_head *q;
1141         int i;
1142
1143         qs = cfs_percpt_alloc(lnet_cpt_table(),
1144                               sizeof(struct list_head));
1145         if (!qs) {
1146                 CERROR("Failed to allocate queues\n");
1147                 return NULL;
1148         }
1149
1150         cfs_percpt_for_each(q, i, qs)
1151                 INIT_LIST_HEAD(q);
1152
1153         return qs;
1154 }
1155
1156 static int lnet_unprepare(void);
1157
1158 static int
1159 lnet_prepare(lnet_pid_t requested_pid)
1160 {
1161         /* Prepare to bring up the network */
1162         struct lnet_res_container **recs;
1163         int                       rc = 0;
1164
1165         if (requested_pid == LNET_PID_ANY) {
1166                 /* Don't instantiate LNET just for me */
1167                 return -ENETDOWN;
1168         }
1169
1170         LASSERT(the_lnet.ln_refcount == 0);
1171
1172         the_lnet.ln_routing = 0;
1173
1174         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
1175         the_lnet.ln_pid = requested_pid;
1176
1177         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
1178         INIT_LIST_HEAD(&the_lnet.ln_remote_peer_ni_list);
1179         INIT_LIST_HEAD(&the_lnet.ln_nets);
1180         INIT_LIST_HEAD(&the_lnet.ln_routers);
1181         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
1182         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
1183         INIT_LIST_HEAD(&the_lnet.ln_dc_request);
1184         INIT_LIST_HEAD(&the_lnet.ln_dc_working);
1185         INIT_LIST_HEAD(&the_lnet.ln_dc_expired);
1186         INIT_LIST_HEAD(&the_lnet.ln_mt_localNIRecovq);
1187         INIT_LIST_HEAD(&the_lnet.ln_mt_peerNIRecovq);
1188         init_waitqueue_head(&the_lnet.ln_dc_waitq);
1189         the_lnet.ln_mt_handler = NULL;
1190         init_completion(&the_lnet.ln_started);
1191
1192         rc = lnet_slab_setup();
1193         if (rc != 0)
1194                 goto failed;
1195
1196         rc = lnet_create_remote_nets_table();
1197         if (rc != 0)
1198                 goto failed;
1199
1200         /*
1201          * NB the interface cookie in wire handles guards against delayed
1202          * replies and ACKs appearing valid after reboot.
1203          */
1204         the_lnet.ln_interface_cookie = ktime_get_real_ns();
1205
1206         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
1207                                                 sizeof(struct lnet_counters));
1208         if (the_lnet.ln_counters == NULL) {
1209                 CERROR("Failed to allocate counters for LNet\n");
1210                 rc = -ENOMEM;
1211                 goto failed;
1212         }
1213
1214         rc = lnet_peer_tables_create();
1215         if (rc != 0)
1216                 goto failed;
1217
1218         rc = lnet_msg_containers_create();
1219         if (rc != 0)
1220                 goto failed;
1221
1222         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
1223                                       LNET_COOKIE_TYPE_EQ);
1224         if (rc != 0)
1225                 goto failed;
1226
1227         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
1228         if (recs == NULL) {
1229                 rc = -ENOMEM;
1230                 goto failed;
1231         }
1232
1233         the_lnet.ln_md_containers = recs;
1234
1235         rc = lnet_portals_create();
1236         if (rc != 0) {
1237                 CERROR("Failed to create portals for LNet: %d\n", rc);
1238                 goto failed;
1239         }
1240
1241         the_lnet.ln_mt_zombie_rstqs = lnet_create_array_of_queues();
1242         if (!the_lnet.ln_mt_zombie_rstqs) {
1243                 rc = -ENOMEM;
1244                 goto failed;
1245         }
1246
1247         return 0;
1248
1249  failed:
1250         lnet_unprepare();
1251         return rc;
1252 }
1253
1254 static int
1255 lnet_unprepare (void)
1256 {
1257         /* NB no LNET_LOCK since this is the last reference.  All LND instances
1258          * have shut down already, so it is safe to unlink and free all
1259          * descriptors, even those that appear committed to a network op (eg MD
1260          * with non-zero pending count) */
1261
1262         lnet_fail_nid(LNET_NID_ANY, 0);
1263
1264         LASSERT(the_lnet.ln_refcount == 0);
1265         LASSERT(list_empty(&the_lnet.ln_test_peers));
1266         LASSERT(list_empty(&the_lnet.ln_nets));
1267
1268         if (the_lnet.ln_mt_zombie_rstqs) {
1269                 lnet_clean_zombie_rstqs();
1270                 the_lnet.ln_mt_zombie_rstqs = NULL;
1271         }
1272
1273         the_lnet.ln_mt_handler = NULL;
1274
1275         lnet_portals_destroy();
1276
1277         if (the_lnet.ln_md_containers != NULL) {
1278                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
1279                 the_lnet.ln_md_containers = NULL;
1280         }
1281
1282         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
1283
1284         lnet_msg_containers_destroy();
1285         lnet_peer_uninit();
1286         lnet_rtrpools_free(0);
1287
1288         if (the_lnet.ln_counters != NULL) {
1289                 cfs_percpt_free(the_lnet.ln_counters);
1290                 the_lnet.ln_counters = NULL;
1291         }
1292         lnet_destroy_remote_nets_table();
1293         lnet_slab_cleanup();
1294
1295         return 0;
1296 }
1297
1298 struct lnet_ni  *
1299 lnet_net2ni_locked(__u32 net_id, int cpt)
1300 {
1301         struct lnet_ni   *ni;
1302         struct lnet_net  *net;
1303
1304         LASSERT(cpt != LNET_LOCK_EX);
1305
1306         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1307                 if (net->net_id == net_id) {
1308                         ni = list_entry(net->net_ni_list.next, struct lnet_ni,
1309                                         ni_netlist);
1310                         return ni;
1311                 }
1312         }
1313
1314         return NULL;
1315 }
1316
1317 struct lnet_ni *
1318 lnet_net2ni_addref(__u32 net)
1319 {
1320         struct lnet_ni *ni;
1321
1322         lnet_net_lock(0);
1323         ni = lnet_net2ni_locked(net, 0);
1324         if (ni)
1325                 lnet_ni_addref_locked(ni, 0);
1326         lnet_net_unlock(0);
1327
1328         return ni;
1329 }
1330 EXPORT_SYMBOL(lnet_net2ni_addref);
1331
1332 struct lnet_net *
1333 lnet_get_net_locked(__u32 net_id)
1334 {
1335         struct lnet_net  *net;
1336
1337         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1338                 if (net->net_id == net_id)
1339                         return net;
1340         }
1341
1342         return NULL;
1343 }
1344
1345 unsigned int
1346 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
1347 {
1348         __u64           key = nid;
1349         unsigned int    val;
1350
1351         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
1352
1353         if (number == 1)
1354                 return 0;
1355
1356         val = hash_long(key, LNET_CPT_BITS);
1357         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
1358         if (val < number)
1359                 return val;
1360
1361         return (unsigned int)(key + val + (val >> 1)) % number;
1362 }
1363
1364 int
1365 lnet_cpt_of_nid_locked(lnet_nid_t nid, struct lnet_ni *ni)
1366 {
1367         struct lnet_net *net;
1368
1369         /* must called with hold of lnet_net_lock */
1370         if (LNET_CPT_NUMBER == 1)
1371                 return 0; /* the only one */
1372
1373         /*
1374          * If NI is provided then use the CPT identified in the NI cpt
1375          * list if one exists. If one doesn't exist, then that NI is
1376          * associated with all CPTs and it follows that the net it belongs
1377          * to is implicitly associated with all CPTs, so just hash the nid
1378          * and return that.
1379          */
1380         if (ni != NULL) {
1381                 if (ni->ni_cpts != NULL)
1382                         return ni->ni_cpts[lnet_nid_cpt_hash(nid,
1383                                                              ni->ni_ncpts)];
1384                 else
1385                         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1386         }
1387
1388         /* no NI provided so look at the net */
1389         net = lnet_get_net_locked(LNET_NIDNET(nid));
1390
1391         if (net != NULL && net->net_cpts != NULL) {
1392                 return net->net_cpts[lnet_nid_cpt_hash(nid, net->net_ncpts)];
1393         }
1394
1395         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1396 }
1397
1398 int
1399 lnet_cpt_of_nid(lnet_nid_t nid, struct lnet_ni *ni)
1400 {
1401         int     cpt;
1402         int     cpt2;
1403
1404         if (LNET_CPT_NUMBER == 1)
1405                 return 0; /* the only one */
1406
1407         cpt = lnet_net_lock_current();
1408
1409         cpt2 = lnet_cpt_of_nid_locked(nid, ni);
1410
1411         lnet_net_unlock(cpt);
1412
1413         return cpt2;
1414 }
1415 EXPORT_SYMBOL(lnet_cpt_of_nid);
1416
1417 int
1418 lnet_islocalnet_locked(__u32 net_id)
1419 {
1420         struct lnet_net *net;
1421         bool local;
1422
1423         net = lnet_get_net_locked(net_id);
1424
1425         local = net != NULL;
1426
1427         return local;
1428 }
1429
1430 int
1431 lnet_islocalnet(__u32 net_id)
1432 {
1433         int cpt;
1434         bool local;
1435
1436         cpt = lnet_net_lock_current();
1437
1438         local = lnet_islocalnet_locked(net_id);
1439
1440         lnet_net_unlock(cpt);
1441
1442         return local;
1443 }
1444
1445 struct lnet_ni  *
1446 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
1447 {
1448         struct lnet_net  *net;
1449         struct lnet_ni   *ni;
1450
1451         LASSERT(cpt != LNET_LOCK_EX);
1452
1453         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1454                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1455                         if (ni->ni_nid == nid)
1456                                 return ni;
1457                 }
1458         }
1459
1460         return NULL;
1461 }
1462
1463 struct lnet_ni *
1464 lnet_nid2ni_addref(lnet_nid_t nid)
1465 {
1466         struct lnet_ni *ni;
1467
1468         lnet_net_lock(0);
1469         ni = lnet_nid2ni_locked(nid, 0);
1470         if (ni)
1471                 lnet_ni_addref_locked(ni, 0);
1472         lnet_net_unlock(0);
1473
1474         return ni;
1475 }
1476 EXPORT_SYMBOL(lnet_nid2ni_addref);
1477
1478 int
1479 lnet_islocalnid(lnet_nid_t nid)
1480 {
1481         struct lnet_ni  *ni;
1482         int             cpt;
1483
1484         cpt = lnet_net_lock_current();
1485         ni = lnet_nid2ni_locked(nid, cpt);
1486         lnet_net_unlock(cpt);
1487
1488         return ni != NULL;
1489 }
1490
1491 int
1492 lnet_count_acceptor_nets(void)
1493 {
1494         /* Return the # of NIs that need the acceptor. */
1495         int              count = 0;
1496         struct lnet_net  *net;
1497         int              cpt;
1498
1499         cpt = lnet_net_lock_current();
1500         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1501                 /* all socklnd type networks should have the acceptor
1502                  * thread started */
1503                 if (net->net_lnd->lnd_accept != NULL)
1504                         count++;
1505         }
1506
1507         lnet_net_unlock(cpt);
1508
1509         return count;
1510 }
1511
1512 struct lnet_ping_buffer *
1513 lnet_ping_buffer_alloc(int nnis, gfp_t gfp)
1514 {
1515         struct lnet_ping_buffer *pbuf;
1516
1517         LIBCFS_ALLOC_GFP(pbuf, LNET_PING_BUFFER_SIZE(nnis), gfp);
1518         if (pbuf) {
1519                 pbuf->pb_nnis = nnis;
1520                 pbuf->pb_needs_post = false;
1521                 atomic_set(&pbuf->pb_refcnt, 1);
1522         }
1523
1524         return pbuf;
1525 }
1526
1527 void
1528 lnet_ping_buffer_free(struct lnet_ping_buffer *pbuf)
1529 {
1530         LASSERT(atomic_read(&pbuf->pb_refcnt) == 0);
1531         LIBCFS_FREE(pbuf, LNET_PING_BUFFER_SIZE(pbuf->pb_nnis));
1532 }
1533
1534 static struct lnet_ping_buffer *
1535 lnet_ping_target_create(int nnis)
1536 {
1537         struct lnet_ping_buffer *pbuf;
1538
1539         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1540         if (pbuf == NULL) {
1541                 CERROR("Can't allocate ping source [%d]\n", nnis);
1542                 return NULL;
1543         }
1544
1545         pbuf->pb_info.pi_nnis = nnis;
1546         pbuf->pb_info.pi_pid = the_lnet.ln_pid;
1547         pbuf->pb_info.pi_magic = LNET_PROTO_PING_MAGIC;
1548         pbuf->pb_info.pi_features =
1549                 LNET_PING_FEAT_NI_STATUS | LNET_PING_FEAT_MULTI_RAIL;
1550
1551         return pbuf;
1552 }
1553
1554 static inline int
1555 lnet_get_net_ni_count_locked(struct lnet_net *net)
1556 {
1557         struct lnet_ni  *ni;
1558         int             count = 0;
1559
1560         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1561                 count++;
1562
1563         return count;
1564 }
1565
1566 static inline int
1567 lnet_get_net_ni_count_pre(struct lnet_net *net)
1568 {
1569         struct lnet_ni  *ni;
1570         int             count = 0;
1571
1572         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
1573                 count++;
1574
1575         return count;
1576 }
1577
1578 static inline int
1579 lnet_get_ni_count(void)
1580 {
1581         struct lnet_ni  *ni;
1582         struct lnet_net *net;
1583         int             count = 0;
1584
1585         lnet_net_lock(0);
1586
1587         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1588                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1589                         count++;
1590         }
1591
1592         lnet_net_unlock(0);
1593
1594         return count;
1595 }
1596
1597 int
1598 lnet_get_net_count(void)
1599 {
1600         struct lnet_net *net;
1601         int count = 0;
1602
1603         lnet_net_lock(0);
1604
1605         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1606                 count++;
1607         }
1608
1609         lnet_net_unlock(0);
1610
1611         return count;
1612 }
1613
1614 void
1615 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
1616 {
1617         struct lnet_ni_status *stat;
1618         int nnis;
1619         int i;
1620
1621         __swab32s(&pbuf->pb_info.pi_magic);
1622         __swab32s(&pbuf->pb_info.pi_features);
1623         __swab32s(&pbuf->pb_info.pi_pid);
1624         __swab32s(&pbuf->pb_info.pi_nnis);
1625         nnis = pbuf->pb_info.pi_nnis;
1626         if (nnis > pbuf->pb_nnis)
1627                 nnis = pbuf->pb_nnis;
1628         for (i = 0; i < nnis; i++) {
1629                 stat = &pbuf->pb_info.pi_ni[i];
1630                 __swab64s(&stat->ns_nid);
1631                 __swab32s(&stat->ns_status);
1632         }
1633 }
1634
1635 int
1636 lnet_ping_info_validate(struct lnet_ping_info *pinfo)
1637 {
1638         if (!pinfo)
1639                 return -EINVAL;
1640         if (pinfo->pi_magic != LNET_PROTO_PING_MAGIC)
1641                 return -EPROTO;
1642         if (!(pinfo->pi_features & LNET_PING_FEAT_NI_STATUS))
1643                 return -EPROTO;
1644         /* Loopback is guaranteed to be present */
1645         if (pinfo->pi_nnis < 1 || pinfo->pi_nnis > lnet_interfaces_max)
1646                 return -ERANGE;
1647         if (LNET_NETTYP(LNET_NIDNET(LNET_PING_INFO_LONI(pinfo))) != LOLND)
1648                 return -EPROTO;
1649         return 0;
1650 }
1651
1652 static void
1653 lnet_ping_target_destroy(void)
1654 {
1655         struct lnet_net *net;
1656         struct lnet_ni  *ni;
1657
1658         lnet_net_lock(LNET_LOCK_EX);
1659
1660         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1661                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1662                         lnet_ni_lock(ni);
1663                         ni->ni_status = NULL;
1664                         lnet_ni_unlock(ni);
1665                 }
1666         }
1667
1668         lnet_ping_buffer_decref(the_lnet.ln_ping_target);
1669         the_lnet.ln_ping_target = NULL;
1670
1671         lnet_net_unlock(LNET_LOCK_EX);
1672 }
1673
1674 static void
1675 lnet_ping_target_event_handler(struct lnet_event *event)
1676 {
1677         struct lnet_ping_buffer *pbuf = event->md.user_ptr;
1678
1679         if (event->unlinked)
1680                 lnet_ping_buffer_decref(pbuf);
1681 }
1682
1683 static int
1684 lnet_ping_target_setup(struct lnet_ping_buffer **ppbuf,
1685                        struct lnet_handle_md *ping_mdh,
1686                        int ni_count, bool set_eq)
1687 {
1688         struct lnet_process_id id = {
1689                 .nid = LNET_NID_ANY,
1690                 .pid = LNET_PID_ANY
1691         };
1692         struct lnet_me *me;
1693         struct lnet_md md = { NULL };
1694         int rc;
1695
1696         if (set_eq)
1697                 the_lnet.ln_ping_target_handler =
1698                         lnet_ping_target_event_handler;
1699
1700         *ppbuf = lnet_ping_target_create(ni_count);
1701         if (*ppbuf == NULL) {
1702                 rc = -ENOMEM;
1703                 goto fail_free_eq;
1704         }
1705
1706         /* Ping target ME/MD */
1707         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1708                           LNET_PROTO_PING_MATCHBITS, 0,
1709                           LNET_UNLINK, LNET_INS_AFTER);
1710         if (IS_ERR(me)) {
1711                 rc = PTR_ERR(me);
1712                 CERROR("Can't create ping target ME: %d\n", rc);
1713                 goto fail_decref_ping_buffer;
1714         }
1715
1716         /* initialize md content */
1717         md.start     = &(*ppbuf)->pb_info;
1718         md.length    = LNET_PING_INFO_SIZE((*ppbuf)->pb_nnis);
1719         md.threshold = LNET_MD_THRESH_INF;
1720         md.max_size  = 0;
1721         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1722                        LNET_MD_MANAGE_REMOTE;
1723         md.handler   = the_lnet.ln_ping_target_handler;
1724         md.user_ptr  = *ppbuf;
1725
1726         rc = LNetMDAttach(me, md, LNET_RETAIN, ping_mdh);
1727         if (rc != 0) {
1728                 CERROR("Can't attach ping target MD: %d\n", rc);
1729                 goto fail_unlink_ping_me;
1730         }
1731         lnet_ping_buffer_addref(*ppbuf);
1732
1733         return 0;
1734
1735 fail_unlink_ping_me:
1736         LNetMEUnlink(me);
1737 fail_decref_ping_buffer:
1738         LASSERT(atomic_read(&(*ppbuf)->pb_refcnt) == 1);
1739         lnet_ping_buffer_decref(*ppbuf);
1740         *ppbuf = NULL;
1741 fail_free_eq:
1742         return rc;
1743 }
1744
1745 static void
1746 lnet_ping_md_unlink(struct lnet_ping_buffer *pbuf,
1747                     struct lnet_handle_md *ping_mdh)
1748 {
1749         LNetMDUnlink(*ping_mdh);
1750         LNetInvalidateMDHandle(ping_mdh);
1751
1752         /* NB the MD could be busy; this just starts the unlink */
1753         wait_var_event_warning(&pbuf->pb_refcnt,
1754                                atomic_read(&pbuf->pb_refcnt) <= 1,
1755                                "Still waiting for ping data MD to unlink\n");
1756 }
1757
1758 static void
1759 lnet_ping_target_install_locked(struct lnet_ping_buffer *pbuf)
1760 {
1761         struct lnet_ni          *ni;
1762         struct lnet_net         *net;
1763         struct lnet_ni_status *ns;
1764         int                     i;
1765         int                     rc;
1766
1767         i = 0;
1768         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1769                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1770                         LASSERT(i < pbuf->pb_nnis);
1771
1772                         ns = &pbuf->pb_info.pi_ni[i];
1773
1774                         ns->ns_nid = ni->ni_nid;
1775
1776                         lnet_ni_lock(ni);
1777                         ns->ns_status = (ni->ni_status != NULL) ?
1778                                          ni->ni_status->ns_status :
1779                                                 LNET_NI_STATUS_UP;
1780                         ni->ni_status = ns;
1781                         lnet_ni_unlock(ni);
1782
1783                         i++;
1784                 }
1785         }
1786         /*
1787          * We (ab)use the ns_status of the loopback interface to
1788          * transmit the sequence number. The first interface listed
1789          * must be the loopback interface.
1790          */
1791         rc = lnet_ping_info_validate(&pbuf->pb_info);
1792         if (rc) {
1793                 LCONSOLE_EMERG("Invalid ping target: %d\n", rc);
1794                 LBUG();
1795         }
1796         LNET_PING_BUFFER_SEQNO(pbuf) =
1797                 atomic_inc_return(&the_lnet.ln_ping_target_seqno);
1798 }
1799
1800 static void
1801 lnet_ping_target_update(struct lnet_ping_buffer *pbuf,
1802                         struct lnet_handle_md ping_mdh)
1803 {
1804         struct lnet_ping_buffer *old_pbuf = NULL;
1805         struct lnet_handle_md old_ping_md;
1806
1807         /* switch the NIs to point to the new ping info created */
1808         lnet_net_lock(LNET_LOCK_EX);
1809
1810         if (!the_lnet.ln_routing)
1811                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1812         if (!lnet_peer_discovery_disabled)
1813                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
1814
1815         /* Ensure only known feature bits have been set. */
1816         LASSERT(pbuf->pb_info.pi_features & LNET_PING_FEAT_BITS);
1817         LASSERT(!(pbuf->pb_info.pi_features & ~LNET_PING_FEAT_BITS));
1818
1819         lnet_ping_target_install_locked(pbuf);
1820
1821         if (the_lnet.ln_ping_target) {
1822                 old_pbuf = the_lnet.ln_ping_target;
1823                 old_ping_md = the_lnet.ln_ping_target_md;
1824         }
1825         the_lnet.ln_ping_target_md = ping_mdh;
1826         the_lnet.ln_ping_target = pbuf;
1827
1828         lnet_net_unlock(LNET_LOCK_EX);
1829
1830         if (old_pbuf) {
1831                 /* unlink and free the old ping info */
1832                 lnet_ping_md_unlink(old_pbuf, &old_ping_md);
1833                 lnet_ping_buffer_decref(old_pbuf);
1834         }
1835
1836         lnet_push_update_to_peers(0);
1837 }
1838
1839 static void
1840 lnet_ping_target_fini(void)
1841 {
1842         lnet_ping_md_unlink(the_lnet.ln_ping_target,
1843                             &the_lnet.ln_ping_target_md);
1844
1845         lnet_ping_target_destroy();
1846 }
1847
1848 /* Resize the push target. */
1849 int lnet_push_target_resize(void)
1850 {
1851         struct lnet_handle_md mdh;
1852         struct lnet_handle_md old_mdh;
1853         struct lnet_ping_buffer *pbuf;
1854         struct lnet_ping_buffer *old_pbuf;
1855         int nnis;
1856         int rc;
1857
1858 again:
1859         nnis = the_lnet.ln_push_target_nnis;
1860         if (nnis <= 0) {
1861                 CDEBUG(D_NET, "Invalid nnis %d\n", nnis);
1862                 return -EINVAL;
1863         }
1864
1865         /* NB: lnet_ping_buffer_alloc() sets pbuf refcount to 1. That ref is
1866          * dropped when we need to resize again (see "old_pbuf" below) or when
1867          * LNet is shutdown (see lnet_push_target_fini())
1868          */
1869         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1870         if (!pbuf) {
1871                 CDEBUG(D_NET, "Can't allocate pbuf for nnis %d\n", nnis);
1872                 return -ENOMEM;
1873         }
1874
1875         rc = lnet_push_target_post(pbuf, &mdh);
1876         if (rc) {
1877                 CDEBUG(D_NET, "Failed to post push target: %d\n", rc);
1878                 lnet_ping_buffer_decref(pbuf);
1879                 return rc;
1880         }
1881
1882         lnet_net_lock(LNET_LOCK_EX);
1883         old_pbuf = the_lnet.ln_push_target;
1884         old_mdh = the_lnet.ln_push_target_md;
1885         the_lnet.ln_push_target = pbuf;
1886         the_lnet.ln_push_target_md = mdh;
1887         lnet_net_unlock(LNET_LOCK_EX);
1888
1889         if (old_pbuf) {
1890                 LNetMDUnlink(old_mdh);
1891                 /* Drop ref set by lnet_ping_buffer_alloc() */
1892                 lnet_ping_buffer_decref(old_pbuf);
1893         }
1894
1895         /* Received another push or reply that requires a larger buffer */
1896         if (nnis < the_lnet.ln_push_target_nnis)
1897                 goto again;
1898
1899         CDEBUG(D_NET, "nnis %d success\n", nnis);
1900         return 0;
1901 }
1902
1903 int lnet_push_target_post(struct lnet_ping_buffer *pbuf,
1904                           struct lnet_handle_md *mdhp)
1905 {
1906         struct lnet_process_id id = { LNET_NID_ANY, LNET_PID_ANY };
1907         struct lnet_md md = { NULL };
1908         struct lnet_me *me;
1909         int rc;
1910
1911         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1912                           LNET_PROTO_PING_MATCHBITS, 0,
1913                           LNET_UNLINK, LNET_INS_AFTER);
1914         if (IS_ERR(me)) {
1915                 rc = PTR_ERR(me);
1916                 CERROR("Can't create push target ME: %d\n", rc);
1917                 return rc;
1918         }
1919
1920         pbuf->pb_needs_post = false;
1921
1922         /* This reference is dropped by lnet_push_target_event_handler() */
1923         lnet_ping_buffer_addref(pbuf);
1924
1925         /* initialize md content */
1926         md.start     = &pbuf->pb_info;
1927         md.length    = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
1928         md.threshold = 1;
1929         md.max_size  = 0;
1930         md.options   = LNET_MD_OP_PUT | LNET_MD_TRUNCATE;
1931         md.user_ptr  = pbuf;
1932         md.handler   = the_lnet.ln_push_target_handler;
1933
1934         rc = LNetMDAttach(me, md, LNET_UNLINK, mdhp);
1935         if (rc) {
1936                 CERROR("Can't attach push MD: %d\n", rc);
1937                 LNetMEUnlink(me);
1938                 lnet_ping_buffer_decref(pbuf);
1939                 pbuf->pb_needs_post = true;
1940                 return rc;
1941         }
1942
1943         CDEBUG(D_NET, "posted push target %p\n", pbuf);
1944
1945         return 0;
1946 }
1947
1948 static void lnet_push_target_event_handler(struct lnet_event *ev)
1949 {
1950         struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1951
1952         CDEBUG(D_NET, "type %d status %d unlinked %d\n", ev->type, ev->status,
1953                ev->unlinked);
1954
1955         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
1956                 lnet_swap_pinginfo(pbuf);
1957
1958         if (ev->type == LNET_EVENT_UNLINK) {
1959                 /* Drop ref added by lnet_push_target_post() */
1960                 lnet_ping_buffer_decref(pbuf);
1961                 return;
1962         }
1963
1964         lnet_peer_push_event(ev);
1965         if (ev->unlinked)
1966                 /* Drop ref added by lnet_push_target_post */
1967                 lnet_ping_buffer_decref(pbuf);
1968 }
1969
1970 /* Initialize the push target. */
1971 static int lnet_push_target_init(void)
1972 {
1973         int rc;
1974
1975         if (the_lnet.ln_push_target)
1976                 return -EALREADY;
1977
1978         the_lnet.ln_push_target_handler =
1979                 lnet_push_target_event_handler;
1980
1981         rc = LNetSetLazyPortal(LNET_RESERVED_PORTAL);
1982         LASSERT(rc == 0);
1983
1984         /* Start at the required minimum, we'll enlarge if required. */
1985         the_lnet.ln_push_target_nnis = LNET_INTERFACES_MIN;
1986
1987         rc = lnet_push_target_resize();
1988
1989         if (rc) {
1990                 LNetClearLazyPortal(LNET_RESERVED_PORTAL);
1991                 the_lnet.ln_push_target_handler = NULL;
1992         }
1993
1994         return rc;
1995 }
1996
1997 /* Clean up the push target. */
1998 static void lnet_push_target_fini(void)
1999 {
2000         if (!the_lnet.ln_push_target)
2001                 return;
2002
2003         /* Unlink and invalidate to prevent new references. */
2004         LNetMDUnlink(the_lnet.ln_push_target_md);
2005         LNetInvalidateMDHandle(&the_lnet.ln_push_target_md);
2006
2007         /* Wait for the unlink to complete. */
2008         wait_var_event_warning(&the_lnet.ln_push_target->pb_refcnt,
2009                                atomic_read(&the_lnet.ln_push_target->pb_refcnt) <= 1,
2010                                "Still waiting for ping data MD to unlink\n");
2011
2012         /* Drop ref set by lnet_ping_buffer_alloc() */
2013         lnet_ping_buffer_decref(the_lnet.ln_push_target);
2014         the_lnet.ln_push_target = NULL;
2015         the_lnet.ln_push_target_nnis = 0;
2016
2017         LNetClearLazyPortal(LNET_RESERVED_PORTAL);
2018         the_lnet.ln_push_target_handler = NULL;
2019 }
2020
2021 static int
2022 lnet_ni_tq_credits(struct lnet_ni *ni)
2023 {
2024         int     credits;
2025
2026         LASSERT(ni->ni_ncpts >= 1);
2027
2028         if (ni->ni_ncpts == 1)
2029                 return ni->ni_net->net_tunables.lct_max_tx_credits;
2030
2031         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
2032         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
2033         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
2034
2035         return credits;
2036 }
2037
2038 static void
2039 lnet_ni_unlink_locked(struct lnet_ni *ni)
2040 {
2041         /* move it to zombie list and nobody can find it anymore */
2042         LASSERT(!list_empty(&ni->ni_netlist));
2043         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
2044         lnet_ni_decref_locked(ni, 0);
2045 }
2046
2047 static void
2048 lnet_clear_zombies_nis_locked(struct lnet_net *net)
2049 {
2050         int             i;
2051         int             islo;
2052         struct lnet_ni  *ni;
2053         struct list_head *zombie_list = &net->net_ni_zombie;
2054
2055         /*
2056          * Now wait for the NIs I just nuked to show up on the zombie
2057          * list and shut them down in guaranteed thread context
2058          */
2059         i = 2;
2060         while (!list_empty(zombie_list)) {
2061                 int     *ref;
2062                 int     j;
2063
2064                 ni = list_entry(zombie_list->next,
2065                                 struct lnet_ni, ni_netlist);
2066                 list_del_init(&ni->ni_netlist);
2067                 /* the ni should be in deleting state. If it's not it's
2068                  * a bug */
2069                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
2070                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
2071                         if (*ref == 0)
2072                                 continue;
2073                         /* still busy, add it back to zombie list */
2074                         list_add(&ni->ni_netlist, zombie_list);
2075                         break;
2076                 }
2077
2078                 if (!list_empty(&ni->ni_netlist)) {
2079                         lnet_net_unlock(LNET_LOCK_EX);
2080                         ++i;
2081                         if ((i & (-i)) == i) {
2082                                 CDEBUG(D_WARNING,
2083                                        "Waiting for zombie LNI %s\n",
2084                                        libcfs_nid2str(ni->ni_nid));
2085                         }
2086                         schedule_timeout_uninterruptible(cfs_time_seconds(1));
2087                         lnet_net_lock(LNET_LOCK_EX);
2088                         continue;
2089                 }
2090
2091                 lnet_net_unlock(LNET_LOCK_EX);
2092
2093                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
2094
2095                 LASSERT(!in_interrupt());
2096                 /* Holding the mutex makes it safe for lnd_shutdown
2097                  * to call module_put(). Module unload cannot finish
2098                  * until lnet_unregister_lnd() completes, and that
2099                  * requires the mutex.
2100                  */
2101                 mutex_lock(&the_lnet.ln_lnd_mutex);
2102                 (net->net_lnd->lnd_shutdown)(ni);
2103                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2104
2105                 if (!islo)
2106                         CDEBUG(D_LNI, "Removed LNI %s\n",
2107                               libcfs_nid2str(ni->ni_nid));
2108
2109                 lnet_ni_free(ni);
2110                 i = 2;
2111                 lnet_net_lock(LNET_LOCK_EX);
2112         }
2113 }
2114
2115 /* shutdown down the NI and release refcount */
2116 static void
2117 lnet_shutdown_lndni(struct lnet_ni *ni)
2118 {
2119         int i;
2120         struct lnet_net *net = ni->ni_net;
2121
2122         lnet_net_lock(LNET_LOCK_EX);
2123         lnet_ni_lock(ni);
2124         ni->ni_state = LNET_NI_STATE_DELETING;
2125         lnet_ni_unlock(ni);
2126         lnet_ni_unlink_locked(ni);
2127         lnet_incr_dlc_seq();
2128         lnet_net_unlock(LNET_LOCK_EX);
2129
2130         /* clear messages for this NI on the lazy portal */
2131         for (i = 0; i < the_lnet.ln_nportals; i++)
2132                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
2133
2134         lnet_net_lock(LNET_LOCK_EX);
2135         lnet_clear_zombies_nis_locked(net);
2136         lnet_net_unlock(LNET_LOCK_EX);
2137 }
2138
2139 static void
2140 lnet_shutdown_lndnet(struct lnet_net *net)
2141 {
2142         struct lnet_ni *ni;
2143
2144         lnet_net_lock(LNET_LOCK_EX);
2145
2146         list_del_init(&net->net_list);
2147
2148         while (!list_empty(&net->net_ni_list)) {
2149                 ni = list_entry(net->net_ni_list.next,
2150                                 struct lnet_ni, ni_netlist);
2151                 lnet_net_unlock(LNET_LOCK_EX);
2152                 lnet_shutdown_lndni(ni);
2153                 lnet_net_lock(LNET_LOCK_EX);
2154         }
2155
2156         lnet_net_unlock(LNET_LOCK_EX);
2157
2158         /* Do peer table cleanup for this net */
2159         lnet_peer_tables_cleanup(net);
2160
2161         lnet_net_free(net);
2162 }
2163
2164 static void
2165 lnet_shutdown_lndnets(void)
2166 {
2167         struct lnet_net *net;
2168         LIST_HEAD(resend);
2169         struct lnet_msg *msg, *tmp;
2170
2171         /* NB called holding the global mutex */
2172
2173         /* All quiet on the API front */
2174         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
2175         LASSERT(the_lnet.ln_refcount == 0);
2176
2177         lnet_net_lock(LNET_LOCK_EX);
2178         the_lnet.ln_state = LNET_STATE_STOPPING;
2179
2180         /*
2181          * move the nets to the zombie list to avoid them being
2182          * picked up for new work. LONET is also included in the
2183          * Nets that will be moved to the zombie list
2184          */
2185         list_splice_init(&the_lnet.ln_nets, &the_lnet.ln_net_zombie);
2186
2187         /* Drop the cached loopback Net. */
2188         if (the_lnet.ln_loni != NULL) {
2189                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
2190                 the_lnet.ln_loni = NULL;
2191         }
2192         lnet_net_unlock(LNET_LOCK_EX);
2193
2194         /* iterate through the net zombie list and delete each net */
2195         while (!list_empty(&the_lnet.ln_net_zombie)) {
2196                 net = list_entry(the_lnet.ln_net_zombie.next,
2197                                  struct lnet_net, net_list);
2198                 lnet_shutdown_lndnet(net);
2199         }
2200
2201         spin_lock(&the_lnet.ln_msg_resend_lock);
2202         list_splice(&the_lnet.ln_msg_resend, &resend);
2203         spin_unlock(&the_lnet.ln_msg_resend_lock);
2204
2205         list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
2206                 list_del_init(&msg->msg_list);
2207                 msg->msg_no_resend = true;
2208                 lnet_finalize(msg, -ECANCELED);
2209         }
2210
2211         lnet_net_lock(LNET_LOCK_EX);
2212         the_lnet.ln_state = LNET_STATE_SHUTDOWN;
2213         lnet_net_unlock(LNET_LOCK_EX);
2214 }
2215
2216 static int
2217 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
2218 {
2219         int                     rc = -EINVAL;
2220         struct lnet_tx_queue    *tq;
2221         int                     i;
2222         struct lnet_net         *net = ni->ni_net;
2223
2224         mutex_lock(&the_lnet.ln_lnd_mutex);
2225
2226         if (tun) {
2227                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
2228                 ni->ni_lnd_tunables_set = true;
2229         }
2230
2231         rc = (net->net_lnd->lnd_startup)(ni);
2232
2233         mutex_unlock(&the_lnet.ln_lnd_mutex);
2234
2235         if (rc != 0) {
2236                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
2237                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
2238                 goto failed0;
2239         }
2240
2241         lnet_ni_lock(ni);
2242         ni->ni_state = LNET_NI_STATE_ACTIVE;
2243         lnet_ni_unlock(ni);
2244
2245         /* We keep a reference on the loopback net through the loopback NI */
2246         if (net->net_lnd->lnd_type == LOLND) {
2247                 lnet_ni_addref(ni);
2248                 LASSERT(the_lnet.ln_loni == NULL);
2249                 the_lnet.ln_loni = ni;
2250                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
2251                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
2252                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
2253                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
2254                 return 0;
2255         }
2256
2257         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
2258             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
2259                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
2260                                    libcfs_lnd2str(net->net_lnd->lnd_type),
2261                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
2262                                         "" : "per-peer ");
2263                 /* shutdown the NI since if we get here then it must've already
2264                  * been started
2265                  */
2266                 lnet_shutdown_lndni(ni);
2267                 return -EINVAL;
2268         }
2269
2270         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
2271                 tq->tq_credits_min =
2272                 tq->tq_credits_max =
2273                 tq->tq_credits = lnet_ni_tq_credits(ni);
2274         }
2275
2276         atomic_set(&ni->ni_tx_credits,
2277                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
2278         atomic_set(&ni->ni_healthv, LNET_MAX_HEALTH_VALUE);
2279
2280         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
2281                 libcfs_nid2str(ni->ni_nid),
2282                 ni->ni_net->net_tunables.lct_peer_tx_credits,
2283                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
2284                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
2285                 ni->ni_net->net_tunables.lct_peer_timeout);
2286
2287         return 0;
2288 failed0:
2289         lnet_ni_free(ni);
2290         return rc;
2291 }
2292
2293 static int
2294 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
2295 {
2296         struct lnet_ni *ni;
2297         struct lnet_net *net_l = NULL;
2298         LIST_HEAD(local_ni_list);
2299         int rc;
2300         int ni_count = 0;
2301         __u32 lnd_type;
2302         const struct lnet_lnd  *lnd;
2303         int peer_timeout =
2304                 net->net_tunables.lct_peer_timeout;
2305         int maxtxcredits =
2306                 net->net_tunables.lct_max_tx_credits;
2307         int peerrtrcredits =
2308                 net->net_tunables.lct_peer_rtr_credits;
2309
2310         /*
2311          * make sure that this net is unique. If it isn't then
2312          * we are adding interfaces to an already existing network, and
2313          * 'net' is just a convenient way to pass in the list.
2314          * if it is unique we need to find the LND and load it if
2315          * necessary.
2316          */
2317         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
2318                 lnd_type = LNET_NETTYP(net->net_id);
2319
2320                 mutex_lock(&the_lnet.ln_lnd_mutex);
2321                 lnd = lnet_find_lnd_by_type(lnd_type);
2322
2323                 if (lnd == NULL) {
2324                         mutex_unlock(&the_lnet.ln_lnd_mutex);
2325                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
2326                         mutex_lock(&the_lnet.ln_lnd_mutex);
2327
2328                         lnd = lnet_find_lnd_by_type(lnd_type);
2329                         if (lnd == NULL) {
2330                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2331                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
2332                                 libcfs_lnd2str(lnd_type),
2333                                 libcfs_lnd2modname(lnd_type), rc);
2334 #ifndef HAVE_MODULE_LOADING_SUPPORT
2335                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
2336                                                 "compiled with kernel module "
2337                                                 "loading support.");
2338 #endif
2339                                 rc = -EINVAL;
2340                                 goto failed0;
2341                         }
2342                 }
2343
2344                 net->net_lnd = lnd;
2345
2346                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2347
2348                 net_l = net;
2349         }
2350
2351         /*
2352          * net_l: if the network being added is unique then net_l
2353          *        will point to that network
2354          *        if the network being added is not unique then
2355          *        net_l points to the existing network.
2356          *
2357          * When we enter the loop below, we'll pick NIs off he
2358          * network beign added and start them up, then add them to
2359          * a local ni list. Once we've successfully started all
2360          * the NIs then we join the local NI list (of started up
2361          * networks) with the net_l->net_ni_list, which should
2362          * point to the correct network to add the new ni list to
2363          *
2364          * If any of the new NIs fail to start up, then we want to
2365          * iterate through the local ni list, which should include
2366          * any NIs which were successfully started up, and shut
2367          * them down.
2368          *
2369          * After than we want to delete the network being added,
2370          * to avoid a memory leak.
2371          */
2372
2373         /*
2374          * When a network uses TCP bonding then all its interfaces
2375          * must be specified when the network is first defined: the
2376          * TCP bonding code doesn't allow for interfaces to be added
2377          * or removed.
2378          */
2379         if (net_l != net && net_l != NULL && use_tcp_bonding &&
2380             LNET_NETTYP(net_l->net_id) == SOCKLND) {
2381                 rc = -EINVAL;
2382                 goto failed0;
2383         }
2384
2385         while (!list_empty(&net->net_ni_added)) {
2386                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
2387                                 ni_netlist);
2388                 list_del_init(&ni->ni_netlist);
2389
2390                 /* make sure that the the NI we're about to start
2391                  * up is actually unique. if it's not fail. */
2392                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
2393                                         ni->ni_interfaces[0])) {
2394                         rc = -EEXIST;
2395                         goto failed1;
2396                 }
2397
2398                 /* adjust the pointer the parent network, just in case it
2399                  * the net is a duplicate */
2400                 ni->ni_net = net_l;
2401
2402                 rc = lnet_startup_lndni(ni, tun);
2403
2404                 if (rc < 0)
2405                         goto failed1;
2406
2407                 lnet_ni_addref(ni);
2408                 list_add_tail(&ni->ni_netlist, &local_ni_list);
2409
2410                 ni_count++;
2411         }
2412
2413         lnet_net_lock(LNET_LOCK_EX);
2414         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
2415         lnet_incr_dlc_seq();
2416         lnet_net_unlock(LNET_LOCK_EX);
2417
2418         /* if the network is not unique then we don't want to keep
2419          * it around after we're done. Free it. Otherwise add that
2420          * net to the global the_lnet.ln_nets */
2421         if (net_l != net && net_l != NULL) {
2422                 /*
2423                  * TODO - note. currently the tunables can not be updated
2424                  * once added
2425                  */
2426                 lnet_net_free(net);
2427         } else {
2428                 /*
2429                  * restore tunables after it has been overwitten by the
2430                  * lnd
2431                  */
2432                 if (peer_timeout != -1)
2433                         net->net_tunables.lct_peer_timeout = peer_timeout;
2434                 if (maxtxcredits != -1)
2435                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
2436                 if (peerrtrcredits != -1)
2437                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
2438
2439                 lnet_net_lock(LNET_LOCK_EX);
2440                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
2441                 lnet_net_unlock(LNET_LOCK_EX);
2442         }
2443
2444         /* update net count */
2445         lnet_current_net_count = lnet_get_net_count();
2446
2447         return ni_count;
2448
2449 failed1:
2450         /*
2451          * shutdown the new NIs that are being started up
2452          * free the NET being started
2453          */
2454         while (!list_empty(&local_ni_list)) {
2455                 ni = list_entry(local_ni_list.next, struct lnet_ni,
2456                                 ni_netlist);
2457
2458                 lnet_shutdown_lndni(ni);
2459         }
2460
2461 failed0:
2462         lnet_net_free(net);
2463
2464         return rc;
2465 }
2466
2467 static int
2468 lnet_startup_lndnets(struct list_head *netlist)
2469 {
2470         struct lnet_net         *net;
2471         int                     rc;
2472         int                     ni_count = 0;
2473
2474         /*
2475          * Change to running state before bringing up the LNDs. This
2476          * allows lnet_shutdown_lndnets() to assert that we've passed
2477          * through here.
2478          */
2479         lnet_net_lock(LNET_LOCK_EX);
2480         the_lnet.ln_state = LNET_STATE_RUNNING;
2481         lnet_net_unlock(LNET_LOCK_EX);
2482
2483         while (!list_empty(netlist)) {
2484                 net = list_entry(netlist->next, struct lnet_net, net_list);
2485                 list_del_init(&net->net_list);
2486
2487                 rc = lnet_startup_lndnet(net, NULL);
2488
2489                 if (rc < 0)
2490                         goto failed;
2491
2492                 ni_count += rc;
2493         }
2494
2495         return ni_count;
2496 failed:
2497         lnet_shutdown_lndnets();
2498
2499         return rc;
2500 }
2501
2502 /**
2503  * Initialize LNet library.
2504  *
2505  * Automatically called at module loading time. Caller has to call
2506  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
2507  * latter returned 0. It must be called exactly once.
2508  *
2509  * \retval 0 on success
2510  * \retval -ve on failures.
2511  */
2512 int lnet_lib_init(void)
2513 {
2514         int rc;
2515
2516         lnet_assert_wire_constants();
2517
2518         /* refer to global cfs_cpt_table for now */
2519         the_lnet.ln_cpt_table = cfs_cpt_tab;
2520         the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_tab);
2521
2522         LASSERT(the_lnet.ln_cpt_number > 0);
2523         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
2524                 /* we are under risk of consuming all lh_cookie */
2525                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
2526                        "please change setting of CPT-table and retry\n",
2527                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
2528                 return -E2BIG;
2529         }
2530
2531         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
2532                 the_lnet.ln_cpt_bits++;
2533
2534         rc = lnet_create_locks();
2535         if (rc != 0) {
2536                 CERROR("Can't create LNet global locks: %d\n", rc);
2537                 return rc;
2538         }
2539
2540         the_lnet.ln_refcount = 0;
2541         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
2542         INIT_LIST_HEAD(&the_lnet.ln_msg_resend);
2543
2544         /* The hash table size is the number of bits it takes to express the set
2545          * ln_num_routes, minus 1 (better to under estimate than over so we
2546          * don't waste memory). */
2547         if (rnet_htable_size <= 0)
2548                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
2549         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
2550                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
2551         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
2552                                            order_base_2(rnet_htable_size) - 1);
2553
2554         /* All LNDs apart from the LOLND are in separate modules.  They
2555          * register themselves when their module loads, and unregister
2556          * themselves when their module is unloaded. */
2557         lnet_register_lnd(&the_lolnd);
2558         return 0;
2559 }
2560
2561 /**
2562  * Finalize LNet library.
2563  *
2564  * \pre lnet_lib_init() called with success.
2565  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
2566  *
2567  * As this happens at module-unload, all lnds must already be unloaded,
2568  * so they must already be unregistered.
2569  */
2570 void lnet_lib_exit(void)
2571 {
2572         int i;
2573
2574         LASSERT(the_lnet.ln_refcount == 0);
2575         lnet_unregister_lnd(&the_lolnd);
2576         for (i = 0; i < NUM_LNDS; i++)
2577                 LASSERT(!the_lnet.ln_lnds[i]);
2578         lnet_destroy_locks();
2579 }
2580
2581 /**
2582  * Set LNet PID and start LNet interfaces, routing, and forwarding.
2583  *
2584  * Users must call this function at least once before any other functions.
2585  * For each successful call there must be a corresponding call to
2586  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
2587  * ignored.
2588  *
2589  * The PID used by LNet may be different from the one requested.
2590  * See LNetGetId().
2591  *
2592  * \param requested_pid PID requested by the caller.
2593  *
2594  * \return >= 0 on success, and < 0 error code on failures.
2595  */
2596 int
2597 LNetNIInit(lnet_pid_t requested_pid)
2598 {
2599         int                     im_a_router = 0;
2600         int                     rc;
2601         int                     ni_count;
2602         struct lnet_ping_buffer *pbuf;
2603         struct lnet_handle_md   ping_mdh;
2604         LIST_HEAD(net_head);
2605         struct lnet_net         *net;
2606
2607         mutex_lock(&the_lnet.ln_api_mutex);
2608
2609         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
2610
2611         if (the_lnet.ln_refcount > 0) {
2612                 rc = the_lnet.ln_refcount++;
2613                 mutex_unlock(&the_lnet.ln_api_mutex);
2614                 return rc;
2615         }
2616
2617         rc = lnet_prepare(requested_pid);
2618         if (rc != 0) {
2619                 mutex_unlock(&the_lnet.ln_api_mutex);
2620                 return rc;
2621         }
2622
2623         /* create a network for Loopback network */
2624         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
2625         if (net == NULL) {
2626                 rc = -ENOMEM;
2627                 goto err_empty_list;
2628         }
2629
2630         /* Add in the loopback NI */
2631         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
2632                 rc = -ENOMEM;
2633                 goto err_empty_list;
2634         }
2635
2636         /* If LNet is being initialized via DLC it is possible
2637          * that the user requests not to load module parameters (ones which
2638          * are supported by DLC) on initialization.  Therefore, make sure not
2639          * to load networks, routes and forwarding from module parameters
2640          * in this case.  On cleanup in case of failure only clean up
2641          * routes if it has been loaded */
2642         if (!the_lnet.ln_nis_from_mod_params) {
2643                 rc = lnet_parse_networks(&net_head, lnet_get_networks(),
2644                                          use_tcp_bonding);
2645                 if (rc < 0)
2646                         goto err_empty_list;
2647         }
2648
2649         ni_count = lnet_startup_lndnets(&net_head);
2650         if (ni_count < 0) {
2651                 rc = ni_count;
2652                 goto err_empty_list;
2653         }
2654
2655         if (!the_lnet.ln_nis_from_mod_params) {
2656                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
2657                 if (rc != 0)
2658                         goto err_shutdown_lndnis;
2659
2660                 rc = lnet_rtrpools_alloc(im_a_router);
2661                 if (rc != 0)
2662                         goto err_destroy_routes;
2663         }
2664
2665         rc = lnet_acceptor_start();
2666         if (rc != 0)
2667                 goto err_destroy_routes;
2668
2669         the_lnet.ln_refcount = 1;
2670         /* Now I may use my own API functions... */
2671
2672         rc = lnet_ping_target_setup(&pbuf, &ping_mdh, ni_count, true);
2673         if (rc != 0)
2674                 goto err_acceptor_stop;
2675
2676         lnet_ping_target_update(pbuf, ping_mdh);
2677
2678         the_lnet.ln_mt_handler = lnet_mt_event_handler;
2679
2680         rc = lnet_push_target_init();
2681         if (rc != 0)
2682                 goto err_stop_ping;
2683
2684         rc = lnet_peer_discovery_start();
2685         if (rc != 0)
2686                 goto err_destroy_push_target;
2687
2688         rc = lnet_monitor_thr_start();
2689         if (rc != 0)
2690                 goto err_stop_discovery_thr;
2691
2692         lnet_fault_init();
2693         lnet_router_debugfs_init();
2694
2695         mutex_unlock(&the_lnet.ln_api_mutex);
2696
2697         complete_all(&the_lnet.ln_started);
2698
2699         /* wait for all routers to start */
2700         lnet_wait_router_start();
2701
2702         return 0;
2703
2704 err_stop_discovery_thr:
2705         lnet_peer_discovery_stop();
2706 err_destroy_push_target:
2707         lnet_push_target_fini();
2708 err_stop_ping:
2709         lnet_ping_target_fini();
2710 err_acceptor_stop:
2711         the_lnet.ln_refcount = 0;
2712         lnet_acceptor_stop();
2713 err_destroy_routes:
2714         if (!the_lnet.ln_nis_from_mod_params)
2715                 lnet_destroy_routes();
2716 err_shutdown_lndnis:
2717         lnet_shutdown_lndnets();
2718 err_empty_list:
2719         lnet_unprepare();
2720         LASSERT(rc < 0);
2721         mutex_unlock(&the_lnet.ln_api_mutex);
2722         while (!list_empty(&net_head)) {
2723                 struct lnet_net *net;
2724
2725                 net = list_entry(net_head.next, struct lnet_net, net_list);
2726                 list_del_init(&net->net_list);
2727                 lnet_net_free(net);
2728         }
2729         return rc;
2730 }
2731 EXPORT_SYMBOL(LNetNIInit);
2732
2733 /**
2734  * Stop LNet interfaces, routing, and forwarding.
2735  *
2736  * Users must call this function once for each successful call to LNetNIInit().
2737  * Once the LNetNIFini() operation has been started, the results of pending
2738  * API operations are undefined.
2739  *
2740  * \return always 0 for current implementation.
2741  */
2742 int
2743 LNetNIFini(void)
2744 {
2745         mutex_lock(&the_lnet.ln_api_mutex);
2746
2747         LASSERT(the_lnet.ln_refcount > 0);
2748
2749         if (the_lnet.ln_refcount != 1) {
2750                 the_lnet.ln_refcount--;
2751         } else {
2752                 LASSERT(!the_lnet.ln_niinit_self);
2753
2754                 lnet_fault_fini();
2755
2756                 lnet_router_debugfs_fini();
2757                 lnet_monitor_thr_stop();
2758                 lnet_peer_discovery_stop();
2759                 lnet_push_target_fini();
2760                 lnet_ping_target_fini();
2761
2762                 /* Teardown fns that use my own API functions BEFORE here */
2763                 the_lnet.ln_refcount = 0;
2764
2765                 lnet_acceptor_stop();
2766                 lnet_destroy_routes();
2767                 lnet_shutdown_lndnets();
2768                 lnet_unprepare();
2769         }
2770
2771         mutex_unlock(&the_lnet.ln_api_mutex);
2772         return 0;
2773 }
2774 EXPORT_SYMBOL(LNetNIFini);
2775
2776 /**
2777  * Grabs the ni data from the ni structure and fills the out
2778  * parameters
2779  *
2780  * \param[in] ni network        interface structure
2781  * \param[out] cfg_ni           NI config information
2782  * \param[out] tun              network and LND tunables
2783  */
2784 static void
2785 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
2786                    struct lnet_ioctl_config_lnd_tunables *tun,
2787                    struct lnet_ioctl_element_stats *stats,
2788                    __u32 tun_size)
2789 {
2790         size_t min_size = 0;
2791         int i;
2792
2793         if (!ni || !cfg_ni || !tun)
2794                 return;
2795
2796         if (ni->ni_interfaces[0] != NULL) {
2797                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2798                         if (ni->ni_interfaces[i] != NULL) {
2799                                 strncpy(cfg_ni->lic_ni_intf[i],
2800                                         ni->ni_interfaces[i],
2801                                         sizeof(cfg_ni->lic_ni_intf[i]));
2802                         }
2803                 }
2804         }
2805
2806         cfg_ni->lic_nid = ni->ni_nid;
2807         if (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND)
2808                 cfg_ni->lic_status = LNET_NI_STATUS_UP;
2809         else
2810                 cfg_ni->lic_status = ni->ni_status->ns_status;
2811         cfg_ni->lic_tcp_bonding = use_tcp_bonding;
2812         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
2813
2814         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
2815
2816         if (stats) {
2817                 stats->iel_send_count = lnet_sum_stats(&ni->ni_stats,
2818                                                        LNET_STATS_TYPE_SEND);
2819                 stats->iel_recv_count = lnet_sum_stats(&ni->ni_stats,
2820                                                        LNET_STATS_TYPE_RECV);
2821                 stats->iel_drop_count = lnet_sum_stats(&ni->ni_stats,
2822                                                        LNET_STATS_TYPE_DROP);
2823         }
2824
2825         /*
2826          * tun->lt_tun will always be present, but in order to be
2827          * backwards compatible, we need to deal with the cases when
2828          * tun->lt_tun is smaller than what the kernel has, because it
2829          * comes from an older version of a userspace program, then we'll
2830          * need to copy as much information as we have available space.
2831          */
2832         min_size = tun_size - sizeof(tun->lt_cmn);
2833         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
2834
2835         /* copy over the cpts */
2836         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
2837             ni->ni_cpts == NULL)  {
2838                 for (i = 0; i < ni->ni_ncpts; i++)
2839                         cfg_ni->lic_cpts[i] = i;
2840         } else {
2841                 for (i = 0;
2842                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
2843                      i < LNET_MAX_SHOW_NUM_CPT;
2844                      i++)
2845                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
2846         }
2847         cfg_ni->lic_ncpts = ni->ni_ncpts;
2848 }
2849
2850 /**
2851  * NOTE: This is a legacy function left in the code to be backwards
2852  * compatible with older userspace programs. It should eventually be
2853  * removed.
2854  *
2855  * Grabs the ni data from the ni structure and fills the out
2856  * parameters
2857  *
2858  * \param[in] ni network        interface structure
2859  * \param[out] config           config information
2860  */
2861 static void
2862 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
2863                          struct lnet_ioctl_config_data *config)
2864 {
2865         struct lnet_ioctl_net_config *net_config;
2866         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
2867         size_t min_size, tunable_size = 0;
2868         int i;
2869
2870         if (!ni || !config)
2871                 return;
2872
2873         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
2874         if (!net_config)
2875                 return;
2876
2877         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
2878                      ARRAY_SIZE(net_config->ni_interfaces));
2879
2880         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2881                 if (!ni->ni_interfaces[i])
2882                         break;
2883
2884                 strncpy(net_config->ni_interfaces[i],
2885                         ni->ni_interfaces[i],
2886                         sizeof(net_config->ni_interfaces[i]));
2887         }
2888
2889         config->cfg_nid = ni->ni_nid;
2890         config->cfg_config_u.cfg_net.net_peer_timeout =
2891                 ni->ni_net->net_tunables.lct_peer_timeout;
2892         config->cfg_config_u.cfg_net.net_max_tx_credits =
2893                 ni->ni_net->net_tunables.lct_max_tx_credits;
2894         config->cfg_config_u.cfg_net.net_peer_tx_credits =
2895                 ni->ni_net->net_tunables.lct_peer_tx_credits;
2896         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
2897                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
2898
2899         if (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND)
2900                 net_config->ni_status = LNET_NI_STATUS_UP;
2901         else
2902                 net_config->ni_status = ni->ni_status->ns_status;
2903
2904         if (ni->ni_cpts) {
2905                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
2906
2907                 for (i = 0; i < num_cpts; i++)
2908                         net_config->ni_cpts[i] = ni->ni_cpts[i];
2909
2910                 config->cfg_ncpts = num_cpts;
2911         }
2912
2913         /*
2914          * See if user land tools sent in a newer and larger version
2915          * of struct lnet_tunables than what the kernel uses.
2916          */
2917         min_size = sizeof(*config) + sizeof(*net_config);
2918
2919         if (config->cfg_hdr.ioc_len > min_size)
2920                 tunable_size = config->cfg_hdr.ioc_len - min_size;
2921
2922         /* Don't copy too much data to user space */
2923         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
2924         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
2925
2926         if (lnd_cfg && min_size) {
2927                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
2928                 config->cfg_config_u.cfg_net.net_interface_count = 1;
2929
2930                 /* Tell user land that kernel side has less data */
2931                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
2932                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
2933                         config->cfg_hdr.ioc_len -= min_size;
2934                 }
2935         }
2936 }
2937
2938 struct lnet_ni *
2939 lnet_get_ni_idx_locked(int idx)
2940 {
2941         struct lnet_ni          *ni;
2942         struct lnet_net         *net;
2943
2944         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2945                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2946                         if (idx-- == 0)
2947                                 return ni;
2948                 }
2949         }
2950
2951         return NULL;
2952 }
2953
2954 struct lnet_ni *
2955 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
2956 {
2957         struct lnet_ni          *ni;
2958         struct lnet_net         *net = mynet;
2959
2960         /*
2961          * It is possible that the net has been cleaned out while there is
2962          * a message being sent. This function accessed the net without
2963          * checking if the list is empty
2964          */
2965         if (prev == NULL) {
2966                 if (net == NULL)
2967                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
2968                                         net_list);
2969                 if (list_empty(&net->net_ni_list))
2970                         return NULL;
2971                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2972                                 ni_netlist);
2973
2974                 return ni;
2975         }
2976
2977         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
2978                 /* if you reached the end of the ni list and the net is
2979                  * specified, then there are no more nis in that net */
2980                 if (net != NULL)
2981                         return NULL;
2982
2983                 /* we reached the end of this net ni list. move to the
2984                  * next net */
2985                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
2986                         /* no more nets and no more NIs. */
2987                         return NULL;
2988
2989                 /* get the next net */
2990                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
2991                                  net_list);
2992                 if (list_empty(&net->net_ni_list))
2993                         return NULL;
2994                 /* get the ni on it */
2995                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2996                                 ni_netlist);
2997
2998                 return ni;
2999         }
3000
3001         if (list_empty(&prev->ni_netlist))
3002                 return NULL;
3003
3004         /* there are more nis left */
3005         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
3006
3007         return ni;
3008 }
3009
3010 int
3011 lnet_get_net_config(struct lnet_ioctl_config_data *config)
3012 {
3013         struct lnet_ni *ni;
3014         int cpt;
3015         int rc = -ENOENT;
3016         int idx = config->cfg_count;
3017
3018         cpt = lnet_net_lock_current();
3019
3020         ni = lnet_get_ni_idx_locked(idx);
3021
3022         if (ni != NULL) {
3023                 rc = 0;
3024                 lnet_ni_lock(ni);
3025                 lnet_fill_ni_info_legacy(ni, config);
3026                 lnet_ni_unlock(ni);
3027         }
3028
3029         lnet_net_unlock(cpt);
3030         return rc;
3031 }
3032
3033 int
3034 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
3035                    struct lnet_ioctl_config_lnd_tunables *tun,
3036                    struct lnet_ioctl_element_stats *stats,
3037                    __u32 tun_size)
3038 {
3039         struct lnet_ni          *ni;
3040         int                     cpt;
3041         int                     rc = -ENOENT;
3042
3043         if (!cfg_ni || !tun || !stats)
3044                 return -EINVAL;
3045
3046         cpt = lnet_net_lock_current();
3047
3048         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
3049
3050         if (ni) {
3051                 rc = 0;
3052                 lnet_ni_lock(ni);
3053                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
3054                 lnet_ni_unlock(ni);
3055         }
3056
3057         lnet_net_unlock(cpt);
3058         return rc;
3059 }
3060
3061 int lnet_get_ni_stats(struct lnet_ioctl_element_msg_stats *msg_stats)
3062 {
3063         struct lnet_ni *ni;
3064         int cpt;
3065         int rc = -ENOENT;
3066
3067         if (!msg_stats)
3068                 return -EINVAL;
3069
3070         cpt = lnet_net_lock_current();
3071
3072         ni = lnet_get_ni_idx_locked(msg_stats->im_idx);
3073
3074         if (ni) {
3075                 lnet_usr_translate_stats(msg_stats, &ni->ni_stats);
3076                 rc = 0;
3077         }
3078
3079         lnet_net_unlock(cpt);
3080
3081         return rc;
3082 }
3083
3084 static int lnet_add_net_common(struct lnet_net *net,
3085                                struct lnet_ioctl_config_lnd_tunables *tun)
3086 {
3087         __u32                   net_id;
3088         struct lnet_ping_buffer *pbuf;
3089         struct lnet_handle_md   ping_mdh;
3090         int                     rc;
3091         struct lnet_remotenet *rnet;
3092         int                     net_ni_count;
3093
3094         lnet_net_lock(LNET_LOCK_EX);
3095         rnet = lnet_find_rnet_locked(net->net_id);
3096         lnet_net_unlock(LNET_LOCK_EX);
3097         /*
3098          * make sure that the net added doesn't invalidate the current
3099          * configuration LNet is keeping
3100          */
3101         if (rnet) {
3102                 CERROR("Adding net %s will invalidate routing configuration\n",
3103                        libcfs_net2str(net->net_id));
3104                 lnet_net_free(net);
3105                 return -EUSERS;
3106         }
3107
3108         /*
3109          * make sure you calculate the correct number of slots in the ping
3110          * buffer. Since the ping info is a flattened list of all the NIs,
3111          * we should allocate enough slots to accomodate the number of NIs
3112          * which will be added.
3113          *
3114          * since ni hasn't been configured yet, use
3115          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
3116          */
3117         net_ni_count = lnet_get_net_ni_count_pre(net);
3118
3119         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3120                                     net_ni_count + lnet_get_ni_count(),
3121                                     false);
3122         if (rc < 0) {
3123                 lnet_net_free(net);
3124                 return rc;
3125         }
3126
3127         if (tun)
3128                 memcpy(&net->net_tunables,
3129                        &tun->lt_cmn, sizeof(net->net_tunables));
3130         else
3131                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
3132
3133         net_id = net->net_id;
3134
3135         rc = lnet_startup_lndnet(net,
3136                                  (tun) ? &tun->lt_tun : NULL);
3137         if (rc < 0)
3138                 goto failed;
3139
3140         lnet_net_lock(LNET_LOCK_EX);
3141         net = lnet_get_net_locked(net_id);
3142         lnet_net_unlock(LNET_LOCK_EX);
3143
3144         LASSERT(net);
3145
3146         /*
3147          * Start the acceptor thread if this is the first network
3148          * being added that requires the thread.
3149          */
3150         if (net->net_lnd->lnd_accept) {
3151                 rc = lnet_acceptor_start();
3152                 if (rc < 0) {
3153                         /* shutdown the net that we just started */
3154                         CERROR("Failed to start up acceptor thread\n");
3155                         lnet_shutdown_lndnet(net);
3156                         goto failed;
3157                 }
3158         }
3159
3160         lnet_net_lock(LNET_LOCK_EX);
3161         lnet_peer_net_added(net);
3162         lnet_net_unlock(LNET_LOCK_EX);
3163
3164         lnet_ping_target_update(pbuf, ping_mdh);
3165
3166         return 0;
3167
3168 failed:
3169         lnet_ping_md_unlink(pbuf, &ping_mdh);
3170         lnet_ping_buffer_decref(pbuf);
3171         return rc;
3172 }
3173
3174 static int lnet_handle_legacy_ip2nets(char *ip2nets,
3175                                       struct lnet_ioctl_config_lnd_tunables *tun)
3176 {
3177         struct lnet_net *net;
3178         char *nets;
3179         int rc;
3180         LIST_HEAD(net_head);
3181
3182         rc = lnet_parse_ip2nets(&nets, ip2nets);
3183         if (rc < 0)
3184                 return rc;
3185
3186         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3187         if (rc < 0)
3188                 return rc;
3189
3190         mutex_lock(&the_lnet.ln_api_mutex);
3191         while (!list_empty(&net_head)) {
3192                 net = list_entry(net_head.next, struct lnet_net, net_list);
3193                 list_del_init(&net->net_list);
3194                 rc = lnet_add_net_common(net, tun);
3195                 if (rc < 0)
3196                         goto out;
3197         }
3198
3199 out:
3200         mutex_unlock(&the_lnet.ln_api_mutex);
3201
3202         while (!list_empty(&net_head)) {
3203                 net = list_entry(net_head.next, struct lnet_net, net_list);
3204                 list_del_init(&net->net_list);
3205                 lnet_net_free(net);
3206         }
3207         return rc;
3208 }
3209
3210 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
3211 {
3212         struct lnet_net *net;
3213         struct lnet_ni *ni;
3214         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3215         int rc, i;
3216         __u32 net_id, lnd_type;
3217
3218         /* get the tunables if they are available */
3219         if (conf->lic_cfg_hdr.ioc_len >=
3220             sizeof(*conf) + sizeof(*tun))
3221                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3222                         conf->lic_bulk;
3223
3224         /* handle legacy ip2nets from DLC */
3225         if (conf->lic_legacy_ip2nets[0] != '\0')
3226                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
3227                                                   tun);
3228
3229         net_id = LNET_NIDNET(conf->lic_nid);
3230         lnd_type = LNET_NETTYP(net_id);
3231
3232         if (!libcfs_isknown_lnd(lnd_type)) {
3233                 CERROR("No valid net and lnd information provided\n");
3234                 return -EINVAL;
3235         }
3236
3237         net = lnet_net_alloc(net_id, NULL);
3238         if (!net)
3239                 return -ENOMEM;
3240
3241         for (i = 0; i < conf->lic_ncpts; i++) {
3242                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
3243                         return -EINVAL;
3244         }
3245
3246         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
3247                                        conf->lic_ni_intf[0]);
3248         if (!ni)
3249                 return -ENOMEM;
3250
3251         mutex_lock(&the_lnet.ln_api_mutex);
3252
3253         rc = lnet_add_net_common(net, tun);
3254
3255         mutex_unlock(&the_lnet.ln_api_mutex);
3256
3257         return rc;
3258 }
3259
3260 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
3261 {
3262         struct lnet_net  *net;
3263         struct lnet_ni *ni;
3264         __u32 net_id = LNET_NIDNET(conf->lic_nid);
3265         struct lnet_ping_buffer *pbuf;
3266         struct lnet_handle_md  ping_mdh;
3267         int               rc;
3268         int               net_count;
3269         __u32             addr;
3270
3271         /* don't allow userspace to shutdown the LOLND */
3272         if (LNET_NETTYP(net_id) == LOLND)
3273                 return -EINVAL;
3274
3275         mutex_lock(&the_lnet.ln_api_mutex);
3276
3277         lnet_net_lock(0);
3278
3279         net = lnet_get_net_locked(net_id);
3280         if (!net) {
3281                 CERROR("net %s not found\n",
3282                        libcfs_net2str(net_id));
3283                 rc = -ENOENT;
3284                 goto unlock_net;
3285         }
3286
3287         addr = LNET_NIDADDR(conf->lic_nid);
3288         if (addr == 0) {
3289                 /* remove the entire net */
3290                 net_count = lnet_get_net_ni_count_locked(net);
3291
3292                 lnet_net_unlock(0);
3293
3294                 /* create and link a new ping info, before removing the old one */
3295                 rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3296                                         lnet_get_ni_count() - net_count,
3297                                         false);
3298                 if (rc != 0)
3299                         goto unlock_api_mutex;
3300
3301                 lnet_shutdown_lndnet(net);
3302
3303                 lnet_acceptor_stop();
3304
3305                 lnet_ping_target_update(pbuf, ping_mdh);
3306
3307                 goto unlock_api_mutex;
3308         }
3309
3310         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
3311         if (!ni) {
3312                 CERROR("nid %s not found\n",
3313                        libcfs_nid2str(conf->lic_nid));
3314                 rc = -ENOENT;
3315                 goto unlock_net;
3316         }
3317
3318         net_count = lnet_get_net_ni_count_locked(net);
3319
3320         lnet_net_unlock(0);
3321
3322         /* create and link a new ping info, before removing the old one */
3323         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3324                                   lnet_get_ni_count() - 1, false);
3325         if (rc != 0)
3326                 goto unlock_api_mutex;
3327
3328         lnet_shutdown_lndni(ni);
3329
3330         lnet_acceptor_stop();
3331
3332         lnet_ping_target_update(pbuf, ping_mdh);
3333
3334         /* check if the net is empty and remove it if it is */
3335         if (net_count == 1)
3336                 lnet_shutdown_lndnet(net);
3337
3338         goto unlock_api_mutex;
3339
3340 unlock_net:
3341         lnet_net_unlock(0);
3342 unlock_api_mutex:
3343         mutex_unlock(&the_lnet.ln_api_mutex);
3344
3345         return rc;
3346 }
3347
3348 /*
3349  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
3350  * They are only expected to be called for unique networks.
3351  * That can be as a result of older DLC library
3352  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
3353  */
3354 int
3355 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
3356 {
3357         struct lnet_net *net;
3358         LIST_HEAD(net_head);
3359         int rc;
3360         struct lnet_ioctl_config_lnd_tunables tun;
3361         char *nets = conf->cfg_config_u.cfg_net.net_intf;
3362
3363         /* Create a net/ni structures for the network string */
3364         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3365         if (rc <= 0)
3366                 return rc == 0 ? -EINVAL : rc;
3367
3368         mutex_lock(&the_lnet.ln_api_mutex);
3369
3370         if (rc > 1) {
3371                 rc = -EINVAL; /* only add one network per call */
3372                 goto out_unlock_clean;
3373         }
3374
3375         net = list_entry(net_head.next, struct lnet_net, net_list);
3376         list_del_init(&net->net_list);
3377
3378         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
3379
3380         memset(&tun, 0, sizeof(tun));
3381
3382         tun.lt_cmn.lct_peer_timeout =
3383           conf->cfg_config_u.cfg_net.net_peer_timeout;
3384         tun.lt_cmn.lct_peer_tx_credits =
3385           conf->cfg_config_u.cfg_net.net_peer_tx_credits;
3386         tun.lt_cmn.lct_peer_rtr_credits =
3387           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
3388         tun.lt_cmn.lct_max_tx_credits =
3389           conf->cfg_config_u.cfg_net.net_max_tx_credits;
3390
3391         rc = lnet_add_net_common(net, &tun);
3392
3393 out_unlock_clean:
3394         mutex_unlock(&the_lnet.ln_api_mutex);
3395         while (!list_empty(&net_head)) {
3396                 /* net_head list is empty in success case */
3397                 net = list_entry(net_head.next, struct lnet_net, net_list);
3398                 list_del_init(&net->net_list);
3399                 lnet_net_free(net);
3400         }
3401         return rc;
3402 }
3403
3404 int
3405 lnet_dyn_del_net(__u32 net_id)
3406 {
3407         struct lnet_net  *net;
3408         struct lnet_ping_buffer *pbuf;
3409         struct lnet_handle_md ping_mdh;
3410         int               rc;
3411         int               net_ni_count;
3412
3413         /* don't allow userspace to shutdown the LOLND */
3414         if (LNET_NETTYP(net_id) == LOLND)
3415                 return -EINVAL;
3416
3417         mutex_lock(&the_lnet.ln_api_mutex);
3418
3419         lnet_net_lock(0);
3420
3421         net = lnet_get_net_locked(net_id);
3422         if (net == NULL) {
3423                 lnet_net_unlock(0);
3424                 rc = -EINVAL;
3425                 goto out;
3426         }
3427
3428         net_ni_count = lnet_get_net_ni_count_locked(net);
3429
3430         lnet_net_unlock(0);
3431
3432         /* create and link a new ping info, before removing the old one */
3433         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3434                                     lnet_get_ni_count() - net_ni_count, false);
3435         if (rc != 0)
3436                 goto out;
3437
3438         lnet_shutdown_lndnet(net);
3439
3440         lnet_acceptor_stop();
3441
3442         lnet_ping_target_update(pbuf, ping_mdh);
3443
3444 out:
3445         mutex_unlock(&the_lnet.ln_api_mutex);
3446
3447         return rc;
3448 }
3449
3450 void lnet_incr_dlc_seq(void)
3451 {
3452         atomic_inc(&lnet_dlc_seq_no);
3453 }
3454
3455 __u32 lnet_get_dlc_seq_locked(void)
3456 {
3457         return atomic_read(&lnet_dlc_seq_no);
3458 }
3459
3460 static void
3461 lnet_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3462 {
3463         struct lnet_net *net;
3464         struct lnet_ni *ni;
3465
3466         lnet_net_lock(LNET_LOCK_EX);
3467         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3468                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3469                         if (ni->ni_nid == nid || all) {
3470                                 atomic_set(&ni->ni_healthv, value);
3471                                 if (list_empty(&ni->ni_recovery) &&
3472                                     value < LNET_MAX_HEALTH_VALUE) {
3473                                         CERROR("manually adding local NI %s to recovery\n",
3474                                                libcfs_nid2str(ni->ni_nid));
3475                                         list_add_tail(&ni->ni_recovery,
3476                                                       &the_lnet.ln_mt_localNIRecovq);
3477                                         lnet_ni_addref_locked(ni, 0);
3478                                 }
3479                                 if (!all) {
3480                                         lnet_net_unlock(LNET_LOCK_EX);
3481                                         return;
3482                                 }
3483                         }
3484                 }
3485         }
3486         lnet_net_unlock(LNET_LOCK_EX);
3487 }
3488
3489 static int
3490 lnet_get_local_ni_hstats(struct lnet_ioctl_local_ni_hstats *stats)
3491 {
3492         int cpt, rc = 0;
3493         struct lnet_ni *ni;
3494         lnet_nid_t nid = stats->hlni_nid;
3495
3496         cpt = lnet_net_lock_current();
3497         ni = lnet_nid2ni_locked(nid, cpt);
3498
3499         if (!ni) {
3500                 rc = -ENOENT;
3501                 goto unlock;
3502         }
3503
3504         stats->hlni_local_interrupt = atomic_read(&ni->ni_hstats.hlt_local_interrupt);
3505         stats->hlni_local_dropped = atomic_read(&ni->ni_hstats.hlt_local_dropped);
3506         stats->hlni_local_aborted = atomic_read(&ni->ni_hstats.hlt_local_aborted);
3507         stats->hlni_local_no_route = atomic_read(&ni->ni_hstats.hlt_local_no_route);
3508         stats->hlni_local_timeout = atomic_read(&ni->ni_hstats.hlt_local_timeout);
3509         stats->hlni_local_error = atomic_read(&ni->ni_hstats.hlt_local_error);
3510         stats->hlni_health_value = atomic_read(&ni->ni_healthv);
3511
3512 unlock:
3513         lnet_net_unlock(cpt);
3514
3515         return rc;
3516 }
3517
3518 static int
3519 lnet_get_local_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3520 {
3521         struct lnet_ni *ni;
3522         int i = 0;
3523
3524         lnet_net_lock(LNET_LOCK_EX);
3525         list_for_each_entry(ni, &the_lnet.ln_mt_localNIRecovq, ni_recovery) {
3526                 list->rlst_nid_array[i] = ni->ni_nid;
3527                 i++;
3528                 if (i >= LNET_MAX_SHOW_NUM_NID)
3529                         break;
3530         }
3531         lnet_net_unlock(LNET_LOCK_EX);
3532         list->rlst_num_nids = i;
3533
3534         return 0;
3535 }
3536
3537 static int
3538 lnet_get_peer_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3539 {
3540         struct lnet_peer_ni *lpni;
3541         int i = 0;
3542
3543         lnet_net_lock(LNET_LOCK_EX);
3544         list_for_each_entry(lpni, &the_lnet.ln_mt_peerNIRecovq, lpni_recovery) {
3545                 list->rlst_nid_array[i] = lpni->lpni_nid;
3546                 i++;
3547                 if (i >= LNET_MAX_SHOW_NUM_NID)
3548                         break;
3549         }
3550         lnet_net_unlock(LNET_LOCK_EX);
3551         list->rlst_num_nids = i;
3552
3553         return 0;
3554 }
3555
3556 /**
3557  * LNet ioctl handler.
3558  *
3559  */
3560 int
3561 LNetCtl(unsigned int cmd, void *arg)
3562 {
3563         struct libcfs_ioctl_data *data = arg;
3564         struct lnet_ioctl_config_data *config;
3565         struct lnet_process_id    id = {0};
3566         struct lnet_ni           *ni;
3567         int                       rc;
3568
3569         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
3570                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
3571
3572         switch (cmd) {
3573         case IOC_LIBCFS_GET_NI:
3574                 rc = LNetGetId(data->ioc_count, &id);
3575                 data->ioc_nid = id.nid;
3576                 return rc;
3577
3578         case IOC_LIBCFS_FAIL_NID:
3579                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
3580
3581         case IOC_LIBCFS_ADD_ROUTE: {
3582                 /* default router sensitivity to 1 */
3583                 unsigned int sensitivity = 1;
3584                 config = arg;
3585
3586                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3587                         return -EINVAL;
3588
3589                 if (config->cfg_config_u.cfg_route.rtr_sensitivity) {
3590                         sensitivity =
3591                           config->cfg_config_u.cfg_route.rtr_sensitivity;
3592                 }
3593
3594                 mutex_lock(&the_lnet.ln_api_mutex);
3595                 rc = lnet_add_route(config->cfg_net,
3596                                     config->cfg_config_u.cfg_route.rtr_hop,
3597                                     config->cfg_nid,
3598                                     config->cfg_config_u.cfg_route.
3599                                         rtr_priority, sensitivity);
3600                 mutex_unlock(&the_lnet.ln_api_mutex);
3601                 return rc;
3602         }
3603
3604         case IOC_LIBCFS_DEL_ROUTE:
3605                 config = arg;
3606
3607                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3608                         return -EINVAL;
3609
3610                 mutex_lock(&the_lnet.ln_api_mutex);
3611                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
3612                 mutex_unlock(&the_lnet.ln_api_mutex);
3613                 return rc;
3614
3615         case IOC_LIBCFS_GET_ROUTE:
3616                 config = arg;
3617
3618                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3619                         return -EINVAL;
3620
3621                 mutex_lock(&the_lnet.ln_api_mutex);
3622                 rc = lnet_get_route(config->cfg_count,
3623                                     &config->cfg_net,
3624                                     &config->cfg_config_u.cfg_route.rtr_hop,
3625                                     &config->cfg_nid,
3626                                     &config->cfg_config_u.cfg_route.rtr_flags,
3627                                     &config->cfg_config_u.cfg_route.
3628                                         rtr_priority,
3629                                     &config->cfg_config_u.cfg_route.
3630                                         rtr_sensitivity);
3631                 mutex_unlock(&the_lnet.ln_api_mutex);
3632                 return rc;
3633
3634         case IOC_LIBCFS_GET_LOCAL_NI: {
3635                 struct lnet_ioctl_config_ni *cfg_ni;
3636                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3637                 struct lnet_ioctl_element_stats *stats;
3638                 __u32 tun_size;
3639
3640                 cfg_ni = arg;
3641
3642                 /* get the tunables if they are available */
3643                 if (cfg_ni->lic_cfg_hdr.ioc_len <
3644                     sizeof(*cfg_ni) + sizeof(*stats) + sizeof(*tun))
3645                         return -EINVAL;
3646
3647                 stats = (struct lnet_ioctl_element_stats *)
3648                         cfg_ni->lic_bulk;
3649                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3650                                 (cfg_ni->lic_bulk + sizeof(*stats));
3651
3652                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
3653                         sizeof(*stats);
3654
3655                 mutex_lock(&the_lnet.ln_api_mutex);
3656                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
3657                 mutex_unlock(&the_lnet.ln_api_mutex);
3658                 return rc;
3659         }
3660
3661         case IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS: {
3662                 struct lnet_ioctl_element_msg_stats *msg_stats = arg;
3663
3664                 if (msg_stats->im_hdr.ioc_len != sizeof(*msg_stats))
3665                         return -EINVAL;
3666
3667                 mutex_lock(&the_lnet.ln_api_mutex);
3668                 rc = lnet_get_ni_stats(msg_stats);
3669                 mutex_unlock(&the_lnet.ln_api_mutex);
3670
3671                 return rc;
3672         }
3673
3674         case IOC_LIBCFS_GET_NET: {
3675                 size_t total = sizeof(*config) +
3676                                sizeof(struct lnet_ioctl_net_config);
3677                 config = arg;
3678
3679                 if (config->cfg_hdr.ioc_len < total)
3680                         return -EINVAL;
3681
3682                 mutex_lock(&the_lnet.ln_api_mutex);
3683                 rc = lnet_get_net_config(config);
3684                 mutex_unlock(&the_lnet.ln_api_mutex);
3685                 return rc;
3686         }
3687
3688         case IOC_LIBCFS_GET_LNET_STATS:
3689         {
3690                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
3691
3692                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
3693                         return -EINVAL;
3694
3695                 mutex_lock(&the_lnet.ln_api_mutex);
3696                 lnet_counters_get(&lnet_stats->st_cntrs);
3697                 mutex_unlock(&the_lnet.ln_api_mutex);
3698                 return 0;
3699         }
3700
3701         case IOC_LIBCFS_CONFIG_RTR:
3702                 config = arg;
3703
3704                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3705                         return -EINVAL;
3706
3707                 mutex_lock(&the_lnet.ln_api_mutex);
3708                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
3709                         rc = lnet_rtrpools_enable();
3710                         mutex_unlock(&the_lnet.ln_api_mutex);
3711                         return rc;
3712                 }
3713                 lnet_rtrpools_disable();
3714                 mutex_unlock(&the_lnet.ln_api_mutex);
3715                 return 0;
3716
3717         case IOC_LIBCFS_ADD_BUF:
3718                 config = arg;
3719
3720                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3721                         return -EINVAL;
3722
3723                 mutex_lock(&the_lnet.ln_api_mutex);
3724                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
3725                                                 buf_tiny,
3726                                           config->cfg_config_u.cfg_buffers.
3727                                                 buf_small,
3728                                           config->cfg_config_u.cfg_buffers.
3729                                                 buf_large);
3730                 mutex_unlock(&the_lnet.ln_api_mutex);
3731                 return rc;
3732
3733         case IOC_LIBCFS_SET_NUMA_RANGE: {
3734                 struct lnet_ioctl_set_value *numa;
3735                 numa = arg;
3736                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3737                         return -EINVAL;
3738                 lnet_net_lock(LNET_LOCK_EX);
3739                 lnet_numa_range = numa->sv_value;
3740                 lnet_net_unlock(LNET_LOCK_EX);
3741                 return 0;
3742         }
3743
3744         case IOC_LIBCFS_GET_NUMA_RANGE: {
3745                 struct lnet_ioctl_set_value *numa;
3746                 numa = arg;
3747                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3748                         return -EINVAL;
3749                 numa->sv_value = lnet_numa_range;
3750                 return 0;
3751         }
3752
3753         case IOC_LIBCFS_GET_BUF: {
3754                 struct lnet_ioctl_pool_cfg *pool_cfg;
3755                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
3756
3757                 config = arg;
3758
3759                 if (config->cfg_hdr.ioc_len < total)
3760                         return -EINVAL;
3761
3762                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
3763
3764                 mutex_lock(&the_lnet.ln_api_mutex);
3765                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
3766                 mutex_unlock(&the_lnet.ln_api_mutex);
3767                 return rc;
3768         }
3769
3770         case IOC_LIBCFS_GET_LOCAL_HSTATS: {
3771                 struct lnet_ioctl_local_ni_hstats *stats = arg;
3772
3773                 if (stats->hlni_hdr.ioc_len < sizeof(*stats))
3774                         return -EINVAL;
3775
3776                 mutex_lock(&the_lnet.ln_api_mutex);
3777                 rc = lnet_get_local_ni_hstats(stats);
3778                 mutex_unlock(&the_lnet.ln_api_mutex);
3779
3780                 return rc;
3781         }
3782
3783         case IOC_LIBCFS_GET_RECOVERY_QUEUE: {
3784                 struct lnet_ioctl_recovery_list *list = arg;
3785                 if (list->rlst_hdr.ioc_len < sizeof(*list))
3786                         return -EINVAL;
3787
3788                 mutex_lock(&the_lnet.ln_api_mutex);
3789                 if (list->rlst_type == LNET_HEALTH_TYPE_LOCAL_NI)
3790                         rc = lnet_get_local_ni_recovery_list(list);
3791                 else
3792                         rc = lnet_get_peer_ni_recovery_list(list);
3793                 mutex_unlock(&the_lnet.ln_api_mutex);
3794                 return rc;
3795         }
3796
3797         case IOC_LIBCFS_ADD_PEER_NI: {
3798                 struct lnet_ioctl_peer_cfg *cfg = arg;
3799
3800                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3801                         return -EINVAL;
3802
3803                 mutex_lock(&the_lnet.ln_api_mutex);
3804                 rc = lnet_add_peer_ni(cfg->prcfg_prim_nid,
3805                                       cfg->prcfg_cfg_nid,
3806                                       cfg->prcfg_mr);
3807                 mutex_unlock(&the_lnet.ln_api_mutex);
3808                 return rc;
3809         }
3810
3811         case IOC_LIBCFS_DEL_PEER_NI: {
3812                 struct lnet_ioctl_peer_cfg *cfg = arg;
3813
3814                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3815                         return -EINVAL;
3816
3817                 mutex_lock(&the_lnet.ln_api_mutex);
3818                 rc = lnet_del_peer_ni(cfg->prcfg_prim_nid,
3819                                       cfg->prcfg_cfg_nid);
3820                 mutex_unlock(&the_lnet.ln_api_mutex);
3821                 return rc;
3822         }
3823
3824         case IOC_LIBCFS_GET_PEER_INFO: {
3825                 struct lnet_ioctl_peer *peer_info = arg;
3826
3827                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
3828                         return -EINVAL;
3829
3830                 mutex_lock(&the_lnet.ln_api_mutex);
3831                 rc = lnet_get_peer_ni_info(
3832                    peer_info->pr_count,
3833                    &peer_info->pr_nid,
3834                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
3835                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
3836                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
3837                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
3838                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
3839                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
3840                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
3841                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
3842                 mutex_unlock(&the_lnet.ln_api_mutex);
3843                 return rc;
3844         }
3845
3846         case IOC_LIBCFS_GET_PEER_NI: {
3847                 struct lnet_ioctl_peer_cfg *cfg = arg;
3848
3849                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3850                         return -EINVAL;
3851
3852                 mutex_lock(&the_lnet.ln_api_mutex);
3853                 rc = lnet_get_peer_info(cfg,
3854                                         (void __user *)cfg->prcfg_bulk);
3855                 mutex_unlock(&the_lnet.ln_api_mutex);
3856                 return rc;
3857         }
3858
3859         case IOC_LIBCFS_GET_PEER_LIST: {
3860                 struct lnet_ioctl_peer_cfg *cfg = arg;
3861
3862                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3863                         return -EINVAL;
3864
3865                 mutex_lock(&the_lnet.ln_api_mutex);
3866                 rc = lnet_get_peer_list(&cfg->prcfg_count, &cfg->prcfg_size,
3867                                 (struct lnet_process_id __user *)cfg->prcfg_bulk);
3868                 mutex_unlock(&the_lnet.ln_api_mutex);
3869                 return rc;
3870         }
3871
3872         case IOC_LIBCFS_SET_HEALHV: {
3873                 struct lnet_ioctl_reset_health_cfg *cfg = arg;
3874                 int value;
3875                 if (cfg->rh_hdr.ioc_len < sizeof(*cfg))
3876                         return -EINVAL;
3877                 if (cfg->rh_value < 0 ||
3878                     cfg->rh_value > LNET_MAX_HEALTH_VALUE)
3879                         value = LNET_MAX_HEALTH_VALUE;
3880                 else
3881                         value = cfg->rh_value;
3882                 CDEBUG(D_NET, "Manually setting healthv to %d for %s:%s. all = %d\n",
3883                        value, (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI) ?
3884                        "local" : "peer", libcfs_nid2str(cfg->rh_nid), cfg->rh_all);
3885                 mutex_lock(&the_lnet.ln_api_mutex);
3886                 if (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI)
3887                         lnet_ni_set_healthv(cfg->rh_nid, value,
3888                                              cfg->rh_all);
3889                 else
3890                         lnet_peer_ni_set_healthv(cfg->rh_nid, value,
3891                                                   cfg->rh_all);
3892                 mutex_unlock(&the_lnet.ln_api_mutex);
3893                 return 0;
3894         }
3895
3896         case IOC_LIBCFS_NOTIFY_ROUTER: {
3897                 time64_t deadline = ktime_get_real_seconds() - data->ioc_u64[0];
3898
3899                 /* The deadline passed in by the user should be some time in
3900                  * seconds in the future since the UNIX epoch. We have to map
3901                  * that deadline to the wall clock.
3902                  */
3903                 deadline += ktime_get_seconds();
3904                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags, false,
3905                                    deadline);
3906         }
3907
3908         case IOC_LIBCFS_LNET_DIST:
3909                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
3910                 if (rc < 0 && rc != -EHOSTUNREACH)
3911                         return rc;
3912
3913                 data->ioc_u32[0] = rc;
3914                 return 0;
3915
3916         case IOC_LIBCFS_TESTPROTOCOMPAT:
3917                 the_lnet.ln_testprotocompat = data->ioc_flags;
3918                 return 0;
3919
3920         case IOC_LIBCFS_LNET_FAULT:
3921                 return lnet_fault_ctl(data->ioc_flags, data);
3922
3923         case IOC_LIBCFS_PING: {
3924                 signed long timeout;
3925
3926                 id.nid = data->ioc_nid;
3927                 id.pid = data->ioc_u32[0];
3928
3929                 /* If timeout is negative then set default of 3 minutes */
3930                 if (((s32)data->ioc_u32[1] <= 0) ||
3931                     data->ioc_u32[1] > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3932                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3933                 else
3934                         timeout = nsecs_to_jiffies(data->ioc_u32[1] * NSEC_PER_MSEC);
3935
3936                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
3937                                data->ioc_plen1 / sizeof(struct lnet_process_id));
3938
3939                 if (rc < 0)
3940                         return rc;
3941
3942                 data->ioc_count = rc;
3943                 return 0;
3944         }
3945
3946         case IOC_LIBCFS_PING_PEER: {
3947                 struct lnet_ioctl_ping_data *ping = arg;
3948                 struct lnet_peer *lp;
3949                 signed long timeout;
3950
3951                 /* If timeout is negative then set default of 3 minutes */
3952                 if (((s32)ping->op_param) <= 0 ||
3953                     ping->op_param > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3954                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3955                 else
3956                         timeout = nsecs_to_jiffies(ping->op_param * NSEC_PER_MSEC);
3957
3958                 rc = lnet_ping(ping->ping_id, timeout,
3959                                ping->ping_buf,
3960                                ping->ping_count);
3961                 if (rc < 0)
3962                         return rc;
3963
3964                 mutex_lock(&the_lnet.ln_api_mutex);
3965                 lp = lnet_find_peer(ping->ping_id.nid);
3966                 if (lp) {
3967                         ping->ping_id.nid = lp->lp_primary_nid;
3968                         ping->mr_info = lnet_peer_is_multi_rail(lp);
3969                         lnet_peer_decref_locked(lp);
3970                 }
3971                 mutex_unlock(&the_lnet.ln_api_mutex);
3972
3973                 ping->ping_count = rc;
3974                 return 0;
3975         }
3976
3977         case IOC_LIBCFS_DISCOVER: {
3978                 struct lnet_ioctl_ping_data *discover = arg;
3979                 struct lnet_peer *lp;
3980
3981                 rc = lnet_discover(discover->ping_id, discover->op_param,
3982                                    discover->ping_buf,
3983                                    discover->ping_count);
3984                 if (rc < 0)
3985                         return rc;
3986
3987                 mutex_lock(&the_lnet.ln_api_mutex);
3988                 lp = lnet_find_peer(discover->ping_id.nid);
3989                 if (lp) {
3990                         discover->ping_id.nid = lp->lp_primary_nid;
3991                         discover->mr_info = lnet_peer_is_multi_rail(lp);
3992                         lnet_peer_decref_locked(lp);
3993                 }
3994                 mutex_unlock(&the_lnet.ln_api_mutex);
3995
3996                 discover->ping_count = rc;
3997                 return 0;
3998         }
3999
4000         default:
4001                 ni = lnet_net2ni_addref(data->ioc_net);
4002                 if (ni == NULL)
4003                         return -EINVAL;
4004
4005                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
4006                         rc = -EINVAL;
4007                 else
4008                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
4009
4010                 lnet_ni_decref(ni);
4011                 return rc;
4012         }
4013         /* not reached */
4014 }
4015 EXPORT_SYMBOL(LNetCtl);
4016
4017 void LNetDebugPeer(struct lnet_process_id id)
4018 {
4019         lnet_debug_peer(id.nid);
4020 }
4021 EXPORT_SYMBOL(LNetDebugPeer);
4022
4023 /**
4024  * Determine if the specified peer \a nid is on the local node.
4025  *
4026  * \param nid   peer nid to check
4027  *
4028  * \retval true         If peer NID is on the local node.
4029  * \retval false        If peer NID is not on the local node.
4030  */
4031 bool LNetIsPeerLocal(lnet_nid_t nid)
4032 {
4033         struct lnet_net *net;
4034         struct lnet_ni *ni;
4035         int cpt;
4036
4037         cpt = lnet_net_lock_current();
4038         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4039                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4040                         if (ni->ni_nid == nid) {
4041                                 lnet_net_unlock(cpt);
4042                                 return true;
4043                         }
4044                 }
4045         }
4046         lnet_net_unlock(cpt);
4047
4048         return false;
4049 }
4050 EXPORT_SYMBOL(LNetIsPeerLocal);
4051
4052 /**
4053  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
4054  * Note that all interfaces share a same PID, as requested by LNetNIInit().
4055  *
4056  * \param index Index of the interface to look up.
4057  * \param id On successful return, this location will hold the
4058  * struct lnet_process_id ID of the interface.
4059  *
4060  * \retval 0 If an interface exists at \a index.
4061  * \retval -ENOENT If no interface has been found.
4062  */
4063 int
4064 LNetGetId(unsigned int index, struct lnet_process_id *id)
4065 {
4066         struct lnet_ni   *ni;
4067         struct lnet_net  *net;
4068         int               cpt;
4069         int               rc = -ENOENT;
4070
4071         LASSERT(the_lnet.ln_refcount > 0);
4072
4073         cpt = lnet_net_lock_current();
4074
4075         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4076                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4077                         if (index-- != 0)
4078                                 continue;
4079
4080                         id->nid = ni->ni_nid;
4081                         id->pid = the_lnet.ln_pid;
4082                         rc = 0;
4083                         break;
4084                 }
4085         }
4086
4087         lnet_net_unlock(cpt);
4088         return rc;
4089 }
4090 EXPORT_SYMBOL(LNetGetId);
4091
4092 struct ping_data {
4093         int rc;
4094         int replied;
4095         struct lnet_handle_md mdh;
4096         struct completion completion;
4097 };
4098
4099 static void
4100 lnet_ping_event_handler(struct lnet_event *event)
4101 {
4102         struct ping_data *pd = event->md.user_ptr;
4103
4104         CDEBUG(D_NET, "ping event (%d %d)%s\n",
4105                event->type, event->status,
4106                event->unlinked ? " unlinked" : "");
4107
4108         if (event->status) {
4109                 if (!pd->rc)
4110                         pd->rc = event->status;
4111         } else if (event->type == LNET_EVENT_REPLY) {
4112                 pd->replied = 1;
4113                 pd->rc = event->mlength;
4114         }
4115         if (event->unlinked)
4116                 complete(&pd->completion);
4117 }
4118
4119 static int lnet_ping(struct lnet_process_id id, signed long timeout,
4120                      struct lnet_process_id __user *ids, int n_ids)
4121 {
4122         struct lnet_md md = { NULL };
4123         struct ping_data pd = { 0 };
4124         struct lnet_ping_buffer *pbuf;
4125         struct lnet_process_id tmpid;
4126         int i;
4127         int nob;
4128         int rc;
4129         int rc2;
4130
4131         /* n_ids limit is arbitrary */
4132         if (n_ids <= 0 || id.nid == LNET_NID_ANY)
4133                 return -EINVAL;
4134
4135         /*
4136          * if the user buffer has more space than the lnet_interfaces_max
4137          * then only fill it up to lnet_interfaces_max
4138          */
4139         if (n_ids > lnet_interfaces_max)
4140                 n_ids = lnet_interfaces_max;
4141
4142         if (id.pid == LNET_PID_ANY)
4143                 id.pid = LNET_PID_LUSTRE;
4144
4145         pbuf = lnet_ping_buffer_alloc(n_ids, GFP_NOFS);
4146         if (!pbuf)
4147                 return -ENOMEM;
4148
4149         /* initialize md content */
4150         md.start     = &pbuf->pb_info;
4151         md.length    = LNET_PING_INFO_SIZE(n_ids);
4152         md.threshold = 2; /* GET/REPLY */
4153         md.max_size  = 0;
4154         md.options   = LNET_MD_TRUNCATE;
4155         md.user_ptr  = &pd;
4156         md.handler   = lnet_ping_event_handler;
4157
4158         init_completion(&pd.completion);
4159
4160         rc = LNetMDBind(md, LNET_UNLINK, &pd.mdh);
4161         if (rc != 0) {
4162                 CERROR("Can't bind MD: %d\n", rc);
4163                 goto fail_ping_buffer_decref;
4164         }
4165
4166         rc = LNetGet(LNET_NID_ANY, pd.mdh, id,
4167                      LNET_RESERVED_PORTAL,
4168                      LNET_PROTO_PING_MATCHBITS, 0, false);
4169
4170         if (rc != 0) {
4171                 /* Don't CERROR; this could be deliberate! */
4172                 rc2 = LNetMDUnlink(pd.mdh);
4173                 LASSERT(rc2 == 0);
4174
4175                 /* NB must wait for the UNLINK event below... */
4176         }
4177
4178         if (wait_for_completion_timeout(&pd.completion, timeout) == 0) {
4179                 /* Ensure completion in finite time... */
4180                 LNetMDUnlink(pd.mdh);
4181                 wait_for_completion(&pd.completion);
4182         }
4183         if (!pd.replied) {
4184                 rc = -EIO;
4185                 goto fail_ping_buffer_decref;
4186         }
4187
4188         nob = pd.rc;
4189         LASSERT(nob >= 0 && nob <= LNET_PING_INFO_SIZE(n_ids));
4190
4191         rc = -EPROTO;           /* if I can't parse... */
4192
4193         if (nob < 8) {
4194                 CERROR("%s: ping info too short %d\n",
4195                        libcfs_id2str(id), nob);
4196                 goto fail_ping_buffer_decref;
4197         }
4198
4199         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
4200                 lnet_swap_pinginfo(pbuf);
4201         } else if (pbuf->pb_info.pi_magic != LNET_PROTO_PING_MAGIC) {
4202                 CERROR("%s: Unexpected magic %08x\n",
4203                        libcfs_id2str(id), pbuf->pb_info.pi_magic);
4204                 goto fail_ping_buffer_decref;
4205         }
4206
4207         if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
4208                 CERROR("%s: ping w/o NI status: 0x%x\n",
4209                        libcfs_id2str(id), pbuf->pb_info.pi_features);
4210                 goto fail_ping_buffer_decref;
4211         }
4212
4213         if (nob < LNET_PING_INFO_SIZE(0)) {
4214                 CERROR("%s: Short reply %d(%d min)\n",
4215                        libcfs_id2str(id),
4216                        nob, (int)LNET_PING_INFO_SIZE(0));
4217                 goto fail_ping_buffer_decref;
4218         }
4219
4220         if (pbuf->pb_info.pi_nnis < n_ids)
4221                 n_ids = pbuf->pb_info.pi_nnis;
4222
4223         if (nob < LNET_PING_INFO_SIZE(n_ids)) {
4224                 CERROR("%s: Short reply %d(%d expected)\n",
4225                        libcfs_id2str(id),
4226                        nob, (int)LNET_PING_INFO_SIZE(n_ids));
4227                 goto fail_ping_buffer_decref;
4228         }
4229
4230         rc = -EFAULT;           /* if I segv in copy_to_user()... */
4231
4232         memset(&tmpid, 0, sizeof(tmpid));
4233         for (i = 0; i < n_ids; i++) {
4234                 tmpid.pid = pbuf->pb_info.pi_pid;
4235                 tmpid.nid = pbuf->pb_info.pi_ni[i].ns_nid;
4236                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
4237                         goto fail_ping_buffer_decref;
4238         }
4239         rc = pbuf->pb_info.pi_nnis;
4240
4241  fail_ping_buffer_decref:
4242         lnet_ping_buffer_decref(pbuf);
4243         return rc;
4244 }
4245
4246 static int
4247 lnet_discover(struct lnet_process_id id, __u32 force,
4248               struct lnet_process_id __user *ids, int n_ids)
4249 {
4250         struct lnet_peer_ni *lpni;
4251         struct lnet_peer_ni *p;
4252         struct lnet_peer *lp;
4253         struct lnet_process_id *buf;
4254         int cpt;
4255         int i;
4256         int rc;
4257         int max_intf = lnet_interfaces_max;
4258
4259         if (n_ids <= 0 ||
4260             id.nid == LNET_NID_ANY)
4261                 return -EINVAL;
4262
4263         if (id.pid == LNET_PID_ANY)
4264                 id.pid = LNET_PID_LUSTRE;
4265
4266         /*
4267          * if the user buffer has more space than the max_intf
4268          * then only fill it up to max_intf
4269          */
4270         if (n_ids > max_intf)
4271                 n_ids = max_intf;
4272
4273         CFS_ALLOC_PTR_ARRAY(buf, n_ids);
4274         if (!buf)
4275                 return -ENOMEM;
4276
4277         cpt = lnet_net_lock_current();
4278         lpni = lnet_nid2peerni_locked(id.nid, LNET_NID_ANY, cpt);
4279         if (IS_ERR(lpni)) {
4280                 rc = PTR_ERR(lpni);
4281                 goto out;
4282         }
4283
4284         /*
4285          * Clearing the NIDS_UPTODATE flag ensures the peer will
4286          * be discovered, provided discovery has not been disabled.
4287          */
4288         lp = lpni->lpni_peer_net->lpn_peer;
4289         spin_lock(&lp->lp_lock);
4290         lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
4291         /* If the force flag is set, force a PING and PUSH as well. */
4292         if (force)
4293                 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
4294         spin_unlock(&lp->lp_lock);
4295         rc = lnet_discover_peer_locked(lpni, cpt, true);
4296         if (rc)
4297                 goto out_decref;
4298
4299         /* Peer may have changed. */
4300         lp = lpni->lpni_peer_net->lpn_peer;
4301         if (lp->lp_nnis < n_ids)
4302                 n_ids = lp->lp_nnis;
4303
4304         i = 0;
4305         p = NULL;
4306         while ((p = lnet_get_next_peer_ni_locked(lp, NULL, p)) != NULL) {
4307                 buf[i].pid = id.pid;
4308                 buf[i].nid = p->lpni_nid;
4309                 if (++i >= n_ids)
4310                         break;
4311         }
4312
4313         lnet_net_unlock(cpt);
4314
4315         rc = -EFAULT;
4316         if (copy_to_user(ids, buf, n_ids * sizeof(*buf)))
4317                 goto out_relock;
4318         rc = n_ids;
4319 out_relock:
4320         lnet_net_lock(cpt);
4321 out_decref:
4322         lnet_peer_ni_decref_locked(lpni);
4323 out:
4324         lnet_net_unlock(cpt);
4325
4326         CFS_FREE_PTR_ARRAY(buf, n_ids);
4327
4328         return rc;
4329 }
4330
4331 /**
4332  * Retrieve peer discovery status.
4333  *
4334  * \retval 1 if lnet_peer_discovery_disabled is 0
4335  * \retval 0 if lnet_peer_discovery_disabled is 1
4336  */
4337 int
4338 LNetGetPeerDiscoveryStatus(void)
4339 {
4340         return !lnet_peer_discovery_disabled;
4341 }
4342 EXPORT_SYMBOL(LNetGetPeerDiscoveryStatus);