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_off = (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_off) {
 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_off = 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         /* only send a push when we're turning off discovery */
 375         if (*discovery_off <= 0 && value > 0)
 376                 lnet_push_update_to_peers(1);
 377         *discovery_off = value;
 378
 379         mutex_unlock(&the_lnet.ln_api_mutex);
 380
 381         return 0;
 382 }
 383
 384 static int
 385 drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp)
 386 {
 387         int rc;
 388         unsigned int *drop_asym_route = (unsigned int *)kp->arg;
 389         unsigned long value;
 390
 391         rc = kstrtoul(val, 0, &value);
 392         if (rc) {
 393                 CERROR("Invalid module parameter value for "
 394                        "'lnet_drop_asym_route'\n");
 395                 return rc;
 396         }
 397
 398         /*
 399          * The purpose of locking the api_mutex here is to ensure that
 400          * the correct value ends up stored properly.
 401          */
 402         mutex_lock(&the_lnet.ln_api_mutex);
 403
 404         if (value == *drop_asym_route) {
 405                 mutex_unlock(&the_lnet.ln_api_mutex);
 406                 return 0;
 407         }
 408
 409         *drop_asym_route = value;
 410
 411         mutex_unlock(&the_lnet.ln_api_mutex);
 412
 413         return 0;
 414 }
 415
 416 static int
 417 transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp)
 418 {
 419         int rc;
 420         unsigned *transaction_to = (unsigned *)kp->arg;
 421         unsigned long value;
 422
 423         rc = kstrtoul(val, 0, &value);
 424         if (rc) {
 425                 CERROR("Invalid module parameter value for 'lnet_transaction_timeout'\n");
 426                 return rc;
 427         }
 428
 429         /*
 430          * The purpose of locking the api_mutex here is to ensure that
 431          * the correct value ends up stored properly.
 432          */
 433         mutex_lock(&the_lnet.ln_api_mutex);
 434
 435         if (value < lnet_retry_count || value == 0) {
 436                 mutex_unlock(&the_lnet.ln_api_mutex);
 437                 CERROR("Invalid value for lnet_transaction_timeout (%lu). "
 438                        "Has to be greater than lnet_retry_count (%u)\n",
 439                        value, lnet_retry_count);
 440                 return -EINVAL;
 441         }
 442
 443         if (value == *transaction_to) {
 444                 mutex_unlock(&the_lnet.ln_api_mutex);
 445                 return 0;
 446         }
 447
 448         *transaction_to = value;
 449         if (lnet_retry_count == 0)
 450                 lnet_lnd_timeout = value;
 451         else
 452                 lnet_lnd_timeout = value / lnet_retry_count;
 453
 454         mutex_unlock(&the_lnet.ln_api_mutex);
 455
 456         return 0;
 457 }
 458
 459 static int
 460 retry_count_set(const char *val, cfs_kernel_param_arg_t *kp)
 461 {
 462         int rc;
 463         unsigned *retry_count = (unsigned *)kp->arg;
 464         unsigned long value;
 465
 466         rc = kstrtoul(val, 0, &value);
 467         if (rc) {
 468                 CERROR("Invalid module parameter value for 'lnet_retry_count'\n");
 469                 return rc;
 470         }
 471
 472         /*
 473          * The purpose of locking the api_mutex here is to ensure that
 474          * the correct value ends up stored properly.
 475          */
 476         mutex_lock(&the_lnet.ln_api_mutex);
 477
 478         if (lnet_health_sensitivity == 0) {
 479                 mutex_unlock(&the_lnet.ln_api_mutex);
 480                 CERROR("Can not set retry_count when health feature is turned off\n");
 481                 return -EINVAL;
 482         }
 483
 484         if (value > lnet_transaction_timeout) {
 485                 mutex_unlock(&the_lnet.ln_api_mutex);
 486                 CERROR("Invalid value for lnet_retry_count (%lu). "
 487                        "Has to be smaller than lnet_transaction_timeout (%u)\n",
 488                        value, lnet_transaction_timeout);
 489                 return -EINVAL;
 490         }
 491
 492         *retry_count = value;
 493
 494         if (value == 0)
 495                 lnet_lnd_timeout = lnet_transaction_timeout;
 496         else
 497                 lnet_lnd_timeout = lnet_transaction_timeout / value;
 498
 499         mutex_unlock(&the_lnet.ln_api_mutex);
 500
 501         return 0;
 502 }
 503
 504 static int
 505 intf_max_set(const char *val, cfs_kernel_param_arg_t *kp)
 506 {
 507         int value, rc;
 508
 509         rc = kstrtoint(val, 0, &value);
 510         if (rc) {
 511                 CERROR("Invalid module parameter value for 'lnet_interfaces_max'\n");
 512                 return rc;
 513         }
 514
 515         if (value < LNET_INTERFACES_MIN) {
 516                 CWARN("max interfaces provided are too small, setting to %d\n",
 517                       LNET_INTERFACES_MAX_DEFAULT);
 518                 value = LNET_INTERFACES_MAX_DEFAULT;
 519         }
 520
 521         *(int *)kp->arg = value;
 522
 523         return 0;
 524 }
 525
 526 static const char *
 527 lnet_get_routes(void)
 528 {
 529         return routes;
 530 }
 531
 532 static const char *
 533 lnet_get_networks(void)
 534 {
 535         const char *nets;
 536         int rc;
 537
 538         if (*networks != 0 && *ip2nets != 0) {
 539                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
 540                                    "'ip2nets' but not both at once\n");
 541                 return NULL;
 542         }
 543
 544         if (*ip2nets != 0) {
 545                 rc = lnet_parse_ip2nets(&nets, ip2nets);
 546                 return (rc == 0) ? nets : NULL;
 547         }
 548
 549         if (*networks != 0)
 550                 return networks;
 551
 552         return "tcp";
 553 }
 554
 555 static void
 556 lnet_init_locks(void)
 557 {
 558         spin_lock_init(&the_lnet.ln_eq_wait_lock);
 559         spin_lock_init(&the_lnet.ln_msg_resend_lock);
 560         init_completion(&the_lnet.ln_mt_wait_complete);
 561         mutex_init(&the_lnet.ln_lnd_mutex);
 562 }
 563
 564 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 565 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 566                                             *  MDs kmem_cache */
 567 struct kmem_cache *lnet_rspt_cachep;       /* response tracker cache */
 568 struct kmem_cache *lnet_msg_cachep;
 569
 570 static int
 571 lnet_slab_setup(void)
 572 {
 573         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 574          * allocated in <size-xxx> kmem_cache).
 575          */
 576         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(struct lnet_me),
 577                                             0, 0, NULL);
 578         if (!lnet_mes_cachep)
 579                 return -ENOMEM;
 580
 581         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 582                                                   LNET_SMALL_MD_SIZE, 0, 0,
 583                                                   NULL);
 584         if (!lnet_small_mds_cachep)
 585                 return -ENOMEM;
 586
 587         lnet_rspt_cachep = kmem_cache_create("lnet_rspt", sizeof(struct lnet_rsp_tracker),
 588                                             0, 0, NULL);
 589         if (!lnet_rspt_cachep)
 590                 return -ENOMEM;
 591
 592         lnet_msg_cachep = kmem_cache_create("lnet_msg", sizeof(struct lnet_msg),
 593                                             0, 0, NULL);
 594         if (!lnet_msg_cachep)
 595                 return -ENOMEM;
 596
 597         return 0;
 598 }
 599
 600 static void
 601 lnet_slab_cleanup(void)
 602 {
 603         if (lnet_msg_cachep) {
 604                 kmem_cache_destroy(lnet_msg_cachep);
 605                 lnet_msg_cachep = NULL;
 606         }
 607
 608
 609         if (lnet_rspt_cachep) {
 610                 kmem_cache_destroy(lnet_rspt_cachep);
 611                 lnet_rspt_cachep = NULL;
 612         }
 613
 614         if (lnet_small_mds_cachep) {
 615                 kmem_cache_destroy(lnet_small_mds_cachep);
 616                 lnet_small_mds_cachep = NULL;
 617         }
 618
 619         if (lnet_mes_cachep) {
 620                 kmem_cache_destroy(lnet_mes_cachep);
 621                 lnet_mes_cachep = NULL;
 622         }
 623 }
 624
 625 static int
 626 lnet_create_remote_nets_table(void)
 627 {
 628         int               i;
 629         struct list_head *hash;
 630
 631         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 632         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 633         CFS_ALLOC_PTR_ARRAY(hash, LNET_REMOTE_NETS_HASH_SIZE);
 634         if (hash == NULL) {
 635                 CERROR("Failed to create remote nets hash table\n");
 636                 return -ENOMEM;
 637         }
 638
 639         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 640                 INIT_LIST_HEAD(&hash[i]);
 641         the_lnet.ln_remote_nets_hash = hash;
 642         return 0;
 643 }
 644
 645 static void
 646 lnet_destroy_remote_nets_table(void)
 647 {
 648         int i;
 649
 650         if (the_lnet.ln_remote_nets_hash == NULL)
 651                 return;
 652
 653         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 654                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 655
 656         CFS_FREE_PTR_ARRAY(the_lnet.ln_remote_nets_hash,
 657                            LNET_REMOTE_NETS_HASH_SIZE);
 658         the_lnet.ln_remote_nets_hash = NULL;
 659 }
 660
 661 static void
 662 lnet_destroy_locks(void)
 663 {
 664         if (the_lnet.ln_res_lock != NULL) {
 665                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 666                 the_lnet.ln_res_lock = NULL;
 667         }
 668
 669         if (the_lnet.ln_net_lock != NULL) {
 670                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 671                 the_lnet.ln_net_lock = NULL;
 672         }
 673 }
 674
 675 static int
 676 lnet_create_locks(void)
 677 {
 678         lnet_init_locks();
 679
 680         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 681         if (the_lnet.ln_res_lock == NULL)
 682                 goto failed;
 683
 684         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 685         if (the_lnet.ln_net_lock == NULL)
 686                 goto failed;
 687
 688         return 0;
 689
 690  failed:
 691         lnet_destroy_locks();
 692         return -ENOMEM;
 693 }
 694
 695 static void lnet_assert_wire_constants(void)
 696 {
 697         /* Wire protocol assertions generated by 'wirecheck'
 698          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 699          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 700          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 701
 702         /* Constants... */
 703         BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
 704         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
 705         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
 706         BUILD_BUG_ON(LNET_MSG_ACK != 0);
 707         BUILD_BUG_ON(LNET_MSG_PUT != 1);
 708         BUILD_BUG_ON(LNET_MSG_GET != 2);
 709         BUILD_BUG_ON(LNET_MSG_REPLY != 3);
 710         BUILD_BUG_ON(LNET_MSG_HELLO != 4);
 711
 712         /* Checks for struct lnet_handle_wire */
 713         BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
 714         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 715                                    wh_interface_cookie) != 0);
 716         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
 717         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 718                                    wh_object_cookie) != 8);
 719         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
 720
 721         /* Checks for struct struct lnet_magicversion */
 722         BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
 723         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
 724         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
 725         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
 726         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
 727         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion,
 728                                    version_minor) != 6);
 729         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
 730
 731         /* Checks for struct struct lnet_hdr */
 732         BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
 733         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
 734         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
 735         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
 736         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
 737         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
 738         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
 739         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
 740         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
 741         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
 742         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
 743         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
 744         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
 745         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
 746         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
 747
 748         /* Ack */
 749         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
 750         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
 751         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
 752         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
 753         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
 754         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
 755
 756         /* Put */
 757         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
 758         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
 759         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
 760         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
 761         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
 762         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
 763         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
 764         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
 765         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
 766         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
 767
 768         /* Get */
 769         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
 770         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
 771         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
 772         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
 773         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
 774         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
 775         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
 776         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
 777         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
 778         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
 779
 780         /* Reply */
 781         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
 782         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
 783
 784         /* Hello */
 785         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
 786         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
 787         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
 788         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
 789
 790         /* Checks for struct lnet_ni_status and related constants */
 791         BUILD_BUG_ON(LNET_NI_STATUS_INVALID != 0x00000000);
 792         BUILD_BUG_ON(LNET_NI_STATUS_UP != 0x15aac0de);
 793         BUILD_BUG_ON(LNET_NI_STATUS_DOWN != 0xdeadface);
 794
 795         /* Checks for struct lnet_ni_status */
 796         BUILD_BUG_ON((int)sizeof(struct lnet_ni_status) != 16);
 797         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_nid) != 0);
 798         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_nid) != 8);
 799         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_status) != 8);
 800         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_status) != 4);
 801         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_unused) != 12);
 802         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_unused) != 4);
 803
 804         /* Checks for struct lnet_ping_info and related constants */
 805         BUILD_BUG_ON(LNET_PROTO_PING_MAGIC != 0x70696E67);
 806         BUILD_BUG_ON(LNET_PING_FEAT_INVAL != 0);
 807         BUILD_BUG_ON(LNET_PING_FEAT_BASE != 1);
 808         BUILD_BUG_ON(LNET_PING_FEAT_NI_STATUS != 2);
 809         BUILD_BUG_ON(LNET_PING_FEAT_RTE_DISABLED != 4);
 810         BUILD_BUG_ON(LNET_PING_FEAT_MULTI_RAIL != 8);
 811         BUILD_BUG_ON(LNET_PING_FEAT_DISCOVERY != 16);
 812         BUILD_BUG_ON(LNET_PING_FEAT_BITS != 31);
 813
 814         /* Checks for struct lnet_ping_info */
 815         BUILD_BUG_ON((int)sizeof(struct lnet_ping_info) != 16);
 816         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_magic) != 0);
 817         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_magic) != 4);
 818         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_features) != 4);
 819         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_features) != 4);
 820         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_pid) != 8);
 821         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_pid) != 4);
 822         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_nnis) != 12);
 823         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_nnis) != 4);
 824         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_ni) != 16);
 825         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_ni) != 0);
 826 }
 827
 828 static const struct lnet_lnd *lnet_find_lnd_by_type(__u32 type)
 829 {
 830         const struct lnet_lnd *lnd;
 831
 832         /* holding lnd mutex */
 833         if (type >= NUM_LNDS)
 834                 return NULL;
 835         lnd = the_lnet.ln_lnds[type];
 836         LASSERT(!lnd || lnd->lnd_type == type);
 837
 838         return lnd;
 839 }
 840
 841 unsigned int
 842 lnet_get_lnd_timeout(void)
 843 {
 844         return lnet_lnd_timeout;
 845 }
 846 EXPORT_SYMBOL(lnet_get_lnd_timeout);
 847
 848 void
 849 lnet_register_lnd(const struct lnet_lnd *lnd)
 850 {
 851         mutex_lock(&the_lnet.ln_lnd_mutex);
 852
 853         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 854         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 855
 856         the_lnet.ln_lnds[lnd->lnd_type] = lnd;
 857
 858         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 859
 860         mutex_unlock(&the_lnet.ln_lnd_mutex);
 861 }
 862 EXPORT_SYMBOL(lnet_register_lnd);
 863
 864 void
 865 lnet_unregister_lnd(const struct lnet_lnd *lnd)
 866 {
 867         mutex_lock(&the_lnet.ln_lnd_mutex);
 868
 869         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 870
 871         the_lnet.ln_lnds[lnd->lnd_type] = NULL;
 872         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 873
 874         mutex_unlock(&the_lnet.ln_lnd_mutex);
 875 }
 876 EXPORT_SYMBOL(lnet_unregister_lnd);
 877
 878 void
 879 lnet_counters_get_common(struct lnet_counters_common *common)
 880 {
 881         struct lnet_counters *ctr;
 882         int i;
 883
 884         memset(common, 0, sizeof(*common));
 885
 886         lnet_net_lock(LNET_LOCK_EX);
 887
 888         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 889                 common->lcc_msgs_max     += ctr->lct_common.lcc_msgs_max;
 890                 common->lcc_msgs_alloc   += ctr->lct_common.lcc_msgs_alloc;
 891                 common->lcc_errors       += ctr->lct_common.lcc_errors;
 892                 common->lcc_send_count   += ctr->lct_common.lcc_send_count;
 893                 common->lcc_recv_count   += ctr->lct_common.lcc_recv_count;
 894                 common->lcc_route_count  += ctr->lct_common.lcc_route_count;
 895                 common->lcc_drop_count   += ctr->lct_common.lcc_drop_count;
 896                 common->lcc_send_length  += ctr->lct_common.lcc_send_length;
 897                 common->lcc_recv_length  += ctr->lct_common.lcc_recv_length;
 898                 common->lcc_route_length += ctr->lct_common.lcc_route_length;
 899                 common->lcc_drop_length  += ctr->lct_common.lcc_drop_length;
 900         }
 901         lnet_net_unlock(LNET_LOCK_EX);
 902 }
 903 EXPORT_SYMBOL(lnet_counters_get_common);
 904
 905 void
 906 lnet_counters_get(struct lnet_counters *counters)
 907 {
 908         struct lnet_counters *ctr;
 909         struct lnet_counters_health *health = &counters->lct_health;
 910         int             i;
 911
 912         memset(counters, 0, sizeof(*counters));
 913
 914         lnet_counters_get_common(&counters->lct_common);
 915
 916         lnet_net_lock(LNET_LOCK_EX);
 917
 918         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 919                 health->lch_rst_alloc    += ctr->lct_health.lch_rst_alloc;
 920                 health->lch_resend_count += ctr->lct_health.lch_resend_count;
 921                 health->lch_response_timeout_count +=
 922                                 ctr->lct_health.lch_response_timeout_count;
 923                 health->lch_local_interrupt_count +=
 924                                 ctr->lct_health.lch_local_interrupt_count;
 925                 health->lch_local_dropped_count +=
 926                                 ctr->lct_health.lch_local_dropped_count;
 927                 health->lch_local_aborted_count +=
 928                                 ctr->lct_health.lch_local_aborted_count;
 929                 health->lch_local_no_route_count +=
 930                                 ctr->lct_health.lch_local_no_route_count;
 931                 health->lch_local_timeout_count +=
 932                                 ctr->lct_health.lch_local_timeout_count;
 933                 health->lch_local_error_count +=
 934                                 ctr->lct_health.lch_local_error_count;
 935                 health->lch_remote_dropped_count +=
 936                                 ctr->lct_health.lch_remote_dropped_count;
 937                 health->lch_remote_error_count +=
 938                                 ctr->lct_health.lch_remote_error_count;
 939                 health->lch_remote_timeout_count +=
 940                                 ctr->lct_health.lch_remote_timeout_count;
 941                 health->lch_network_timeout_count +=
 942                                 ctr->lct_health.lch_network_timeout_count;
 943         }
 944         lnet_net_unlock(LNET_LOCK_EX);
 945 }
 946 EXPORT_SYMBOL(lnet_counters_get);
 947
 948 void
 949 lnet_counters_reset(void)
 950 {
 951         struct lnet_counters *counters;
 952         int             i;
 953
 954         lnet_net_lock(LNET_LOCK_EX);
 955
 956         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 957                 memset(counters, 0, sizeof(struct lnet_counters));
 958
 959         lnet_net_unlock(LNET_LOCK_EX);
 960 }
 961
 962 static char *
 963 lnet_res_type2str(int type)
 964 {
 965         switch (type) {
 966         default:
 967                 LBUG();
 968         case LNET_COOKIE_TYPE_MD:
 969                 return "MD";
 970         case LNET_COOKIE_TYPE_ME:
 971                 return "ME";
 972         case LNET_COOKIE_TYPE_EQ:
 973                 return "EQ";
 974         }
 975 }
 976
 977 static void
 978 lnet_res_container_cleanup(struct lnet_res_container *rec)
 979 {
 980         int     count = 0;
 981
 982         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 983                 return;
 984
 985         while (!list_empty(&rec->rec_active)) {
 986                 struct list_head *e = rec->rec_active.next;
 987
 988                 list_del_init(e);
 989                 if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 990                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
 991
 992                 } else { /* NB: Active MEs should be attached on portals */
 993                         LBUG();
 994                 }
 995                 count++;
 996         }
 997
 998         if (count > 0) {
 999                 /* Found alive MD/ME/EQ, user really should unlink/free
1000                  * all of them before finalize LNet, but if someone didn't,
1001                  * we have to recycle garbage for him */
1002                 CERROR("%d active elements on exit of %s container\n",
1003                        count, lnet_res_type2str(rec->rec_type));
1004         }
1005
1006         if (rec->rec_lh_hash != NULL) {
1007                 CFS_FREE_PTR_ARRAY(rec->rec_lh_hash, LNET_LH_HASH_SIZE);
1008                 rec->rec_lh_hash = NULL;
1009         }
1010
1011         rec->rec_type = 0; /* mark it as finalized */
1012 }
1013
1014 static int
1015 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
1016 {
1017         int     rc = 0;
1018         int     i;
1019
1020         LASSERT(rec->rec_type == 0);
1021
1022         rec->rec_type = type;
1023         INIT_LIST_HEAD(&rec->rec_active);
1024
1025         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
1026
1027         /* Arbitrary choice of hash table size */
1028         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
1029                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
1030         if (rec->rec_lh_hash == NULL) {
1031                 rc = -ENOMEM;
1032                 goto out;
1033         }
1034
1035         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
1036                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
1037
1038         return 0;
1039
1040 out:
1041         CERROR("Failed to setup %s resource container\n",
1042                lnet_res_type2str(type));
1043         lnet_res_container_cleanup(rec);
1044         return rc;
1045 }
1046
1047 static void
1048 lnet_res_containers_destroy(struct lnet_res_container **recs)
1049 {
1050         struct lnet_res_container       *rec;
1051         int                             i;
1052
1053         cfs_percpt_for_each(rec, i, recs)
1054                 lnet_res_container_cleanup(rec);
1055
1056         cfs_percpt_free(recs);
1057 }
1058
1059 static struct lnet_res_container **
1060 lnet_res_containers_create(int type)
1061 {
1062         struct lnet_res_container       **recs;
1063         struct lnet_res_container       *rec;
1064         int                             rc;
1065         int                             i;
1066
1067         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
1068         if (recs == NULL) {
1069                 CERROR("Failed to allocate %s resource containers\n",
1070                        lnet_res_type2str(type));
1071                 return NULL;
1072         }
1073
1074         cfs_percpt_for_each(rec, i, recs) {
1075                 rc = lnet_res_container_setup(rec, i, type);
1076                 if (rc != 0) {
1077                         lnet_res_containers_destroy(recs);
1078                         return NULL;
1079                 }
1080         }
1081
1082         return recs;
1083 }
1084
1085 struct lnet_libhandle *
1086 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
1087 {
1088         /* ALWAYS called with lnet_res_lock held */
1089         struct list_head        *head;
1090         struct lnet_libhandle   *lh;
1091         unsigned int            hash;
1092
1093         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
1094                 return NULL;
1095
1096         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
1097         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
1098
1099         list_for_each_entry(lh, head, lh_hash_chain) {
1100                 if (lh->lh_cookie == cookie)
1101                         return lh;
1102         }
1103
1104         return NULL;
1105 }
1106
1107 void
1108 lnet_res_lh_initialize(struct lnet_res_container *rec,
1109                        struct lnet_libhandle *lh)
1110 {
1111         /* ALWAYS called with lnet_res_lock held */
1112         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
1113         unsigned int    hash;
1114
1115         lh->lh_cookie = rec->rec_lh_cookie;
1116         rec->rec_lh_cookie += 1 << ibits;
1117
1118         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
1119
1120         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
1121 }
1122
1123 struct list_head **
1124 lnet_create_array_of_queues(void)
1125 {
1126         struct list_head **qs;
1127         struct list_head *q;
1128         int i;
1129
1130         qs = cfs_percpt_alloc(lnet_cpt_table(),
1131                               sizeof(struct list_head));
1132         if (!qs) {
1133                 CERROR("Failed to allocate queues\n");
1134                 return NULL;
1135         }
1136
1137         cfs_percpt_for_each(q, i, qs)
1138                 INIT_LIST_HEAD(q);
1139
1140         return qs;
1141 }
1142
1143 static int lnet_unprepare(void);
1144
1145 static int
1146 lnet_prepare(lnet_pid_t requested_pid)
1147 {
1148         /* Prepare to bring up the network */
1149         struct lnet_res_container **recs;
1150         int                       rc = 0;
1151
1152         if (requested_pid == LNET_PID_ANY) {
1153                 /* Don't instantiate LNET just for me */
1154                 return -ENETDOWN;
1155         }
1156
1157         LASSERT(the_lnet.ln_refcount == 0);
1158
1159         the_lnet.ln_routing = 0;
1160
1161         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
1162         the_lnet.ln_pid = requested_pid;
1163
1164         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
1165         INIT_LIST_HEAD(&the_lnet.ln_remote_peer_ni_list);
1166         INIT_LIST_HEAD(&the_lnet.ln_nets);
1167         INIT_LIST_HEAD(&the_lnet.ln_routers);
1168         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
1169         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
1170         INIT_LIST_HEAD(&the_lnet.ln_dc_request);
1171         INIT_LIST_HEAD(&the_lnet.ln_dc_working);
1172         INIT_LIST_HEAD(&the_lnet.ln_dc_expired);
1173         INIT_LIST_HEAD(&the_lnet.ln_mt_localNIRecovq);
1174         INIT_LIST_HEAD(&the_lnet.ln_mt_peerNIRecovq);
1175         init_waitqueue_head(&the_lnet.ln_dc_waitq);
1176         the_lnet.ln_mt_handler = NULL;
1177         init_completion(&the_lnet.ln_started);
1178
1179         rc = lnet_slab_setup();
1180         if (rc != 0)
1181                 goto failed;
1182
1183         rc = lnet_create_remote_nets_table();
1184         if (rc != 0)
1185                 goto failed;
1186
1187         /*
1188          * NB the interface cookie in wire handles guards against delayed
1189          * replies and ACKs appearing valid after reboot.
1190          */
1191         the_lnet.ln_interface_cookie = ktime_get_real_ns();
1192
1193         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
1194                                                 sizeof(struct lnet_counters));
1195         if (the_lnet.ln_counters == NULL) {
1196                 CERROR("Failed to allocate counters for LNet\n");
1197                 rc = -ENOMEM;
1198                 goto failed;
1199         }
1200
1201         rc = lnet_peer_tables_create();
1202         if (rc != 0)
1203                 goto failed;
1204
1205         rc = lnet_msg_containers_create();
1206         if (rc != 0)
1207                 goto failed;
1208
1209         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
1210                                       LNET_COOKIE_TYPE_EQ);
1211         if (rc != 0)
1212                 goto failed;
1213
1214         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
1215         if (recs == NULL) {
1216                 rc = -ENOMEM;
1217                 goto failed;
1218         }
1219
1220         the_lnet.ln_md_containers = recs;
1221
1222         rc = lnet_portals_create();
1223         if (rc != 0) {
1224                 CERROR("Failed to create portals for LNet: %d\n", rc);
1225                 goto failed;
1226         }
1227
1228         the_lnet.ln_mt_zombie_rstqs = lnet_create_array_of_queues();
1229         if (!the_lnet.ln_mt_zombie_rstqs) {
1230                 rc = -ENOMEM;
1231                 goto failed;
1232         }
1233
1234         return 0;
1235
1236  failed:
1237         lnet_unprepare();
1238         return rc;
1239 }
1240
1241 static int
1242 lnet_unprepare (void)
1243 {
1244         /* NB no LNET_LOCK since this is the last reference.  All LND instances
1245          * have shut down already, so it is safe to unlink and free all
1246          * descriptors, even those that appear committed to a network op (eg MD
1247          * with non-zero pending count) */
1248
1249         lnet_fail_nid(LNET_NID_ANY, 0);
1250
1251         LASSERT(the_lnet.ln_refcount == 0);
1252         LASSERT(list_empty(&the_lnet.ln_test_peers));
1253         LASSERT(list_empty(&the_lnet.ln_nets));
1254
1255         if (the_lnet.ln_mt_zombie_rstqs) {
1256                 lnet_clean_zombie_rstqs();
1257                 the_lnet.ln_mt_zombie_rstqs = NULL;
1258         }
1259
1260         lnet_assert_handler_unused(the_lnet.ln_mt_handler);
1261         the_lnet.ln_mt_handler = NULL;
1262
1263         lnet_portals_destroy();
1264
1265         if (the_lnet.ln_md_containers != NULL) {
1266                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
1267                 the_lnet.ln_md_containers = NULL;
1268         }
1269
1270         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
1271
1272         lnet_msg_containers_destroy();
1273         lnet_peer_uninit();
1274         lnet_rtrpools_free(0);
1275
1276         if (the_lnet.ln_counters != NULL) {
1277                 cfs_percpt_free(the_lnet.ln_counters);
1278                 the_lnet.ln_counters = NULL;
1279         }
1280         lnet_destroy_remote_nets_table();
1281         lnet_slab_cleanup();
1282
1283         return 0;
1284 }
1285
1286 struct lnet_ni  *
1287 lnet_net2ni_locked(__u32 net_id, int cpt)
1288 {
1289         struct lnet_ni   *ni;
1290         struct lnet_net  *net;
1291
1292         LASSERT(cpt != LNET_LOCK_EX);
1293
1294         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1295                 if (net->net_id == net_id) {
1296                         ni = list_entry(net->net_ni_list.next, struct lnet_ni,
1297                                         ni_netlist);
1298                         return ni;
1299                 }
1300         }
1301
1302         return NULL;
1303 }
1304
1305 struct lnet_ni *
1306 lnet_net2ni_addref(__u32 net)
1307 {
1308         struct lnet_ni *ni;
1309
1310         lnet_net_lock(0);
1311         ni = lnet_net2ni_locked(net, 0);
1312         if (ni)
1313                 lnet_ni_addref_locked(ni, 0);
1314         lnet_net_unlock(0);
1315
1316         return ni;
1317 }
1318 EXPORT_SYMBOL(lnet_net2ni_addref);
1319
1320 struct lnet_net *
1321 lnet_get_net_locked(__u32 net_id)
1322 {
1323         struct lnet_net  *net;
1324
1325         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1326                 if (net->net_id == net_id)
1327                         return net;
1328         }
1329
1330         return NULL;
1331 }
1332
1333 unsigned int
1334 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
1335 {
1336         __u64           key = nid;
1337         unsigned int    val;
1338
1339         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
1340
1341         if (number == 1)
1342                 return 0;
1343
1344         val = hash_long(key, LNET_CPT_BITS);
1345         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
1346         if (val < number)
1347                 return val;
1348
1349         return (unsigned int)(key + val + (val >> 1)) % number;
1350 }
1351
1352 int
1353 lnet_cpt_of_nid_locked(lnet_nid_t nid, struct lnet_ni *ni)
1354 {
1355         struct lnet_net *net;
1356
1357         /* must called with hold of lnet_net_lock */
1358         if (LNET_CPT_NUMBER == 1)
1359                 return 0; /* the only one */
1360
1361         /*
1362          * If NI is provided then use the CPT identified in the NI cpt
1363          * list if one exists. If one doesn't exist, then that NI is
1364          * associated with all CPTs and it follows that the net it belongs
1365          * to is implicitly associated with all CPTs, so just hash the nid
1366          * and return that.
1367          */
1368         if (ni != NULL) {
1369                 if (ni->ni_cpts != NULL)
1370                         return ni->ni_cpts[lnet_nid_cpt_hash(nid,
1371                                                              ni->ni_ncpts)];
1372                 else
1373                         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1374         }
1375
1376         /* no NI provided so look at the net */
1377         net = lnet_get_net_locked(LNET_NIDNET(nid));
1378
1379         if (net != NULL && net->net_cpts != NULL) {
1380                 return net->net_cpts[lnet_nid_cpt_hash(nid, net->net_ncpts)];
1381         }
1382
1383         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1384 }
1385
1386 int
1387 lnet_cpt_of_nid(lnet_nid_t nid, struct lnet_ni *ni)
1388 {
1389         int     cpt;
1390         int     cpt2;
1391
1392         if (LNET_CPT_NUMBER == 1)
1393                 return 0; /* the only one */
1394
1395         cpt = lnet_net_lock_current();
1396
1397         cpt2 = lnet_cpt_of_nid_locked(nid, ni);
1398
1399         lnet_net_unlock(cpt);
1400
1401         return cpt2;
1402 }
1403 EXPORT_SYMBOL(lnet_cpt_of_nid);
1404
1405 int
1406 lnet_islocalnet_locked(__u32 net_id)
1407 {
1408         struct lnet_net *net;
1409         bool local;
1410
1411         net = lnet_get_net_locked(net_id);
1412
1413         local = net != NULL;
1414
1415         return local;
1416 }
1417
1418 int
1419 lnet_islocalnet(__u32 net_id)
1420 {
1421         int cpt;
1422         bool local;
1423
1424         cpt = lnet_net_lock_current();
1425
1426         local = lnet_islocalnet_locked(net_id);
1427
1428         lnet_net_unlock(cpt);
1429
1430         return local;
1431 }
1432
1433 struct lnet_ni  *
1434 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
1435 {
1436         struct lnet_net  *net;
1437         struct lnet_ni   *ni;
1438
1439         LASSERT(cpt != LNET_LOCK_EX);
1440
1441         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1442                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1443                         if (ni->ni_nid == nid)
1444                                 return ni;
1445                 }
1446         }
1447
1448         return NULL;
1449 }
1450
1451 struct lnet_ni *
1452 lnet_nid2ni_addref(lnet_nid_t nid)
1453 {
1454         struct lnet_ni *ni;
1455
1456         lnet_net_lock(0);
1457         ni = lnet_nid2ni_locked(nid, 0);
1458         if (ni)
1459                 lnet_ni_addref_locked(ni, 0);
1460         lnet_net_unlock(0);
1461
1462         return ni;
1463 }
1464 EXPORT_SYMBOL(lnet_nid2ni_addref);
1465
1466 int
1467 lnet_islocalnid(lnet_nid_t nid)
1468 {
1469         struct lnet_ni  *ni;
1470         int             cpt;
1471
1472         cpt = lnet_net_lock_current();
1473         ni = lnet_nid2ni_locked(nid, cpt);
1474         lnet_net_unlock(cpt);
1475
1476         return ni != NULL;
1477 }
1478
1479 int
1480 lnet_count_acceptor_nets(void)
1481 {
1482         /* Return the # of NIs that need the acceptor. */
1483         int              count = 0;
1484         struct lnet_net  *net;
1485         int              cpt;
1486
1487         cpt = lnet_net_lock_current();
1488         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1489                 /* all socklnd type networks should have the acceptor
1490                  * thread started */
1491                 if (net->net_lnd->lnd_accept != NULL)
1492                         count++;
1493         }
1494
1495         lnet_net_unlock(cpt);
1496
1497         return count;
1498 }
1499
1500 struct lnet_ping_buffer *
1501 lnet_ping_buffer_alloc(int nnis, gfp_t gfp)
1502 {
1503         struct lnet_ping_buffer *pbuf;
1504
1505         LIBCFS_ALLOC_GFP(pbuf, LNET_PING_BUFFER_SIZE(nnis), gfp);
1506         if (pbuf) {
1507                 pbuf->pb_nnis = nnis;
1508                 pbuf->pb_needs_post = false;
1509                 atomic_set(&pbuf->pb_refcnt, 1);
1510         }
1511
1512         return pbuf;
1513 }
1514
1515 void
1516 lnet_ping_buffer_free(struct lnet_ping_buffer *pbuf)
1517 {
1518         LASSERT(atomic_read(&pbuf->pb_refcnt) == 0);
1519         LIBCFS_FREE(pbuf, LNET_PING_BUFFER_SIZE(pbuf->pb_nnis));
1520 }
1521
1522 static struct lnet_ping_buffer *
1523 lnet_ping_target_create(int nnis)
1524 {
1525         struct lnet_ping_buffer *pbuf;
1526
1527         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1528         if (pbuf == NULL) {
1529                 CERROR("Can't allocate ping source [%d]\n", nnis);
1530                 return NULL;
1531         }
1532
1533         pbuf->pb_info.pi_nnis = nnis;
1534         pbuf->pb_info.pi_pid = the_lnet.ln_pid;
1535         pbuf->pb_info.pi_magic = LNET_PROTO_PING_MAGIC;
1536         pbuf->pb_info.pi_features =
1537                 LNET_PING_FEAT_NI_STATUS | LNET_PING_FEAT_MULTI_RAIL;
1538
1539         return pbuf;
1540 }
1541
1542 static inline int
1543 lnet_get_net_ni_count_locked(struct lnet_net *net)
1544 {
1545         struct lnet_ni  *ni;
1546         int             count = 0;
1547
1548         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1549                 count++;
1550
1551         return count;
1552 }
1553
1554 static inline int
1555 lnet_get_net_ni_count_pre(struct lnet_net *net)
1556 {
1557         struct lnet_ni  *ni;
1558         int             count = 0;
1559
1560         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
1561                 count++;
1562
1563         return count;
1564 }
1565
1566 static inline int
1567 lnet_get_ni_count(void)
1568 {
1569         struct lnet_ni  *ni;
1570         struct lnet_net *net;
1571         int             count = 0;
1572
1573         lnet_net_lock(0);
1574
1575         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1576                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1577                         count++;
1578         }
1579
1580         lnet_net_unlock(0);
1581
1582         return count;
1583 }
1584
1585 int
1586 lnet_get_net_count(void)
1587 {
1588         struct lnet_net *net;
1589         int count = 0;
1590
1591         lnet_net_lock(0);
1592
1593         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1594                 count++;
1595         }
1596
1597         lnet_net_unlock(0);
1598
1599         return count;
1600 }
1601
1602 void
1603 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
1604 {
1605         struct lnet_ni_status *stat;
1606         int nnis;
1607         int i;
1608
1609         __swab32s(&pbuf->pb_info.pi_magic);
1610         __swab32s(&pbuf->pb_info.pi_features);
1611         __swab32s(&pbuf->pb_info.pi_pid);
1612         __swab32s(&pbuf->pb_info.pi_nnis);
1613         nnis = pbuf->pb_info.pi_nnis;
1614         if (nnis > pbuf->pb_nnis)
1615                 nnis = pbuf->pb_nnis;
1616         for (i = 0; i < nnis; i++) {
1617                 stat = &pbuf->pb_info.pi_ni[i];
1618                 __swab64s(&stat->ns_nid);
1619                 __swab32s(&stat->ns_status);
1620         }
1621 }
1622
1623 int
1624 lnet_ping_info_validate(struct lnet_ping_info *pinfo)
1625 {
1626         if (!pinfo)
1627                 return -EINVAL;
1628         if (pinfo->pi_magic != LNET_PROTO_PING_MAGIC)
1629                 return -EPROTO;
1630         if (!(pinfo->pi_features & LNET_PING_FEAT_NI_STATUS))
1631                 return -EPROTO;
1632         /* Loopback is guaranteed to be present */
1633         if (pinfo->pi_nnis < 1 || pinfo->pi_nnis > lnet_interfaces_max)
1634                 return -ERANGE;
1635         if (LNET_PING_INFO_LONI(pinfo) != LNET_NID_LO_0)
1636                 return -EPROTO;
1637         return 0;
1638 }
1639
1640 static void
1641 lnet_ping_target_destroy(void)
1642 {
1643         struct lnet_net *net;
1644         struct lnet_ni  *ni;
1645
1646         lnet_net_lock(LNET_LOCK_EX);
1647
1648         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1649                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1650                         lnet_ni_lock(ni);
1651                         ni->ni_status = NULL;
1652                         lnet_ni_unlock(ni);
1653                 }
1654         }
1655
1656         lnet_ping_buffer_decref(the_lnet.ln_ping_target);
1657         the_lnet.ln_ping_target = NULL;
1658
1659         lnet_net_unlock(LNET_LOCK_EX);
1660 }
1661
1662 static void
1663 lnet_ping_target_event_handler(struct lnet_event *event)
1664 {
1665         struct lnet_ping_buffer *pbuf = event->md_user_ptr;
1666
1667         if (event->unlinked)
1668                 lnet_ping_buffer_decref(pbuf);
1669 }
1670
1671 static int
1672 lnet_ping_target_setup(struct lnet_ping_buffer **ppbuf,
1673                        struct lnet_handle_md *ping_mdh,
1674                        int ni_count, bool set_eq)
1675 {
1676         struct lnet_process_id id = {
1677                 .nid = LNET_NID_ANY,
1678                 .pid = LNET_PID_ANY
1679         };
1680         struct lnet_me *me;
1681         struct lnet_md md = { NULL };
1682         int rc;
1683
1684         if (set_eq)
1685                 the_lnet.ln_ping_target_handler =
1686                         lnet_ping_target_event_handler;
1687
1688         *ppbuf = lnet_ping_target_create(ni_count);
1689         if (*ppbuf == NULL) {
1690                 rc = -ENOMEM;
1691                 goto fail_free_eq;
1692         }
1693
1694         /* Ping target ME/MD */
1695         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1696                           LNET_PROTO_PING_MATCHBITS, 0,
1697                           LNET_UNLINK, LNET_INS_AFTER);
1698         if (IS_ERR(me)) {
1699                 rc = PTR_ERR(me);
1700                 CERROR("Can't create ping target ME: %d\n", rc);
1701                 goto fail_decref_ping_buffer;
1702         }
1703
1704         /* initialize md content */
1705         md.start     = &(*ppbuf)->pb_info;
1706         md.length    = LNET_PING_INFO_SIZE((*ppbuf)->pb_nnis);
1707         md.threshold = LNET_MD_THRESH_INF;
1708         md.max_size  = 0;
1709         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1710                        LNET_MD_MANAGE_REMOTE;
1711         md.handler   = the_lnet.ln_ping_target_handler;
1712         md.user_ptr  = *ppbuf;
1713
1714         rc = LNetMDAttach(me, &md, LNET_RETAIN, ping_mdh);
1715         if (rc != 0) {
1716                 CERROR("Can't attach ping target MD: %d\n", rc);
1717                 goto fail_unlink_ping_me;
1718         }
1719         lnet_ping_buffer_addref(*ppbuf);
1720
1721         return 0;
1722
1723 fail_unlink_ping_me:
1724         LNetMEUnlink(me);
1725 fail_decref_ping_buffer:
1726         LASSERT(atomic_read(&(*ppbuf)->pb_refcnt) == 1);
1727         lnet_ping_buffer_decref(*ppbuf);
1728         *ppbuf = NULL;
1729 fail_free_eq:
1730         return rc;
1731 }
1732
1733 static void
1734 lnet_ping_md_unlink(struct lnet_ping_buffer *pbuf,
1735                     struct lnet_handle_md *ping_mdh)
1736 {
1737         LNetMDUnlink(*ping_mdh);
1738         LNetInvalidateMDHandle(ping_mdh);
1739
1740         /* NB the MD could be busy; this just starts the unlink */
1741         wait_var_event_warning(&pbuf->pb_refcnt,
1742                                atomic_read(&pbuf->pb_refcnt) <= 1,
1743                                "Still waiting for ping data MD to unlink\n");
1744 }
1745
1746 static void
1747 lnet_ping_target_install_locked(struct lnet_ping_buffer *pbuf)
1748 {
1749         struct lnet_ni          *ni;
1750         struct lnet_net         *net;
1751         struct lnet_ni_status *ns;
1752         int                     i;
1753         int                     rc;
1754
1755         i = 0;
1756         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1757                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1758                         LASSERT(i < pbuf->pb_nnis);
1759
1760                         ns = &pbuf->pb_info.pi_ni[i];
1761
1762                         ns->ns_nid = ni->ni_nid;
1763
1764                         lnet_ni_lock(ni);
1765                         ns->ns_status = (ni->ni_status != NULL) ?
1766                                          ni->ni_status->ns_status :
1767                                                 LNET_NI_STATUS_UP;
1768                         ni->ni_status = ns;
1769                         lnet_ni_unlock(ni);
1770
1771                         i++;
1772                 }
1773         }
1774         /*
1775          * We (ab)use the ns_status of the loopback interface to
1776          * transmit the sequence number. The first interface listed
1777          * must be the loopback interface.
1778          */
1779         rc = lnet_ping_info_validate(&pbuf->pb_info);
1780         if (rc) {
1781                 LCONSOLE_EMERG("Invalid ping target: %d\n", rc);
1782                 LBUG();
1783         }
1784         LNET_PING_BUFFER_SEQNO(pbuf) =
1785                 atomic_inc_return(&the_lnet.ln_ping_target_seqno);
1786 }
1787
1788 static void
1789 lnet_ping_target_update(struct lnet_ping_buffer *pbuf,
1790                         struct lnet_handle_md ping_mdh)
1791 {
1792         struct lnet_ping_buffer *old_pbuf = NULL;
1793         struct lnet_handle_md old_ping_md;
1794
1795         /* switch the NIs to point to the new ping info created */
1796         lnet_net_lock(LNET_LOCK_EX);
1797
1798         if (!the_lnet.ln_routing)
1799                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1800         if (!lnet_peer_discovery_disabled)
1801                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
1802
1803         /* Ensure only known feature bits have been set. */
1804         LASSERT(pbuf->pb_info.pi_features & LNET_PING_FEAT_BITS);
1805         LASSERT(!(pbuf->pb_info.pi_features & ~LNET_PING_FEAT_BITS));
1806
1807         lnet_ping_target_install_locked(pbuf);
1808
1809         if (the_lnet.ln_ping_target) {
1810                 old_pbuf = the_lnet.ln_ping_target;
1811                 old_ping_md = the_lnet.ln_ping_target_md;
1812         }
1813         the_lnet.ln_ping_target_md = ping_mdh;
1814         the_lnet.ln_ping_target = pbuf;
1815
1816         lnet_net_unlock(LNET_LOCK_EX);
1817
1818         if (old_pbuf) {
1819                 /* unlink and free the old ping info */
1820                 lnet_ping_md_unlink(old_pbuf, &old_ping_md);
1821                 lnet_ping_buffer_decref(old_pbuf);
1822         }
1823
1824         lnet_push_update_to_peers(0);
1825 }
1826
1827 static void
1828 lnet_ping_target_fini(void)
1829 {
1830         lnet_ping_md_unlink(the_lnet.ln_ping_target,
1831                             &the_lnet.ln_ping_target_md);
1832
1833         lnet_assert_handler_unused(the_lnet.ln_ping_target_handler);
1834         lnet_ping_target_destroy();
1835 }
1836
1837 /* Resize the push target. */
1838 int lnet_push_target_resize(void)
1839 {
1840         struct lnet_handle_md mdh;
1841         struct lnet_handle_md old_mdh;
1842         struct lnet_ping_buffer *pbuf;
1843         struct lnet_ping_buffer *old_pbuf;
1844         int nnis;
1845         int rc;
1846
1847 again:
1848         nnis = the_lnet.ln_push_target_nnis;
1849         if (nnis <= 0) {
1850                 CDEBUG(D_NET, "Invalid nnis %d\n", nnis);
1851                 return -EINVAL;
1852         }
1853
1854         /* NB: lnet_ping_buffer_alloc() sets pbuf refcount to 1. That ref is
1855          * dropped when we need to resize again (see "old_pbuf" below) or when
1856          * LNet is shutdown (see lnet_push_target_fini())
1857          */
1858         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1859         if (!pbuf) {
1860                 CDEBUG(D_NET, "Can't allocate pbuf for nnis %d\n", nnis);
1861                 return -ENOMEM;
1862         }
1863
1864         rc = lnet_push_target_post(pbuf, &mdh);
1865         if (rc) {
1866                 CDEBUG(D_NET, "Failed to post push target: %d\n", rc);
1867                 lnet_ping_buffer_decref(pbuf);
1868                 return rc;
1869         }
1870
1871         lnet_net_lock(LNET_LOCK_EX);
1872         old_pbuf = the_lnet.ln_push_target;
1873         old_mdh = the_lnet.ln_push_target_md;
1874         the_lnet.ln_push_target = pbuf;
1875         the_lnet.ln_push_target_md = mdh;
1876         lnet_net_unlock(LNET_LOCK_EX);
1877
1878         if (old_pbuf) {
1879                 LNetMDUnlink(old_mdh);
1880                 /* Drop ref set by lnet_ping_buffer_alloc() */
1881                 lnet_ping_buffer_decref(old_pbuf);
1882         }
1883
1884         /* Received another push or reply that requires a larger buffer */
1885         if (nnis < the_lnet.ln_push_target_nnis)
1886                 goto again;
1887
1888         CDEBUG(D_NET, "nnis %d success\n", nnis);
1889         return 0;
1890 }
1891
1892 int lnet_push_target_post(struct lnet_ping_buffer *pbuf,
1893                           struct lnet_handle_md *mdhp)
1894 {
1895         struct lnet_process_id id = { LNET_NID_ANY, LNET_PID_ANY };
1896         struct lnet_md md = { NULL };
1897         struct lnet_me *me;
1898         int rc;
1899
1900         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1901                           LNET_PROTO_PING_MATCHBITS, 0,
1902                           LNET_UNLINK, LNET_INS_AFTER);
1903         if (IS_ERR(me)) {
1904                 rc = PTR_ERR(me);
1905                 CERROR("Can't create push target ME: %d\n", rc);
1906                 return rc;
1907         }
1908
1909         pbuf->pb_needs_post = false;
1910
1911         /* This reference is dropped by lnet_push_target_event_handler() */
1912         lnet_ping_buffer_addref(pbuf);
1913
1914         /* initialize md content */
1915         md.start     = &pbuf->pb_info;
1916         md.length    = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
1917         md.threshold = 1;
1918         md.max_size  = 0;
1919         md.options   = LNET_MD_OP_PUT | LNET_MD_TRUNCATE;
1920         md.user_ptr  = pbuf;
1921         md.handler   = the_lnet.ln_push_target_handler;
1922
1923         rc = LNetMDAttach(me, &md, LNET_UNLINK, mdhp);
1924         if (rc) {
1925                 CERROR("Can't attach push MD: %d\n", rc);
1926                 LNetMEUnlink(me);
1927                 lnet_ping_buffer_decref(pbuf);
1928                 pbuf->pb_needs_post = true;
1929                 return rc;
1930         }
1931
1932         CDEBUG(D_NET, "posted push target %p\n", pbuf);
1933
1934         return 0;
1935 }
1936
1937 static void lnet_push_target_event_handler(struct lnet_event *ev)
1938 {
1939         struct lnet_ping_buffer *pbuf = ev->md_user_ptr;
1940
1941         CDEBUG(D_NET, "type %d status %d unlinked %d\n", ev->type, ev->status,
1942                ev->unlinked);
1943
1944         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
1945                 lnet_swap_pinginfo(pbuf);
1946
1947         if (ev->type == LNET_EVENT_UNLINK) {
1948                 /* Drop ref added by lnet_push_target_post() */
1949                 lnet_ping_buffer_decref(pbuf);
1950                 return;
1951         }
1952
1953         lnet_peer_push_event(ev);
1954         if (ev->unlinked)
1955                 /* Drop ref added by lnet_push_target_post */
1956                 lnet_ping_buffer_decref(pbuf);
1957 }
1958
1959 /* Initialize the push target. */
1960 static int lnet_push_target_init(void)
1961 {
1962         int rc;
1963
1964         if (the_lnet.ln_push_target)
1965                 return -EALREADY;
1966
1967         the_lnet.ln_push_target_handler =
1968                 lnet_push_target_event_handler;
1969
1970         rc = LNetSetLazyPortal(LNET_RESERVED_PORTAL);
1971         LASSERT(rc == 0);
1972
1973         /* Start at the required minimum, we'll enlarge if required. */
1974         the_lnet.ln_push_target_nnis = LNET_INTERFACES_MIN;
1975
1976         rc = lnet_push_target_resize();
1977
1978         if (rc) {
1979                 LNetClearLazyPortal(LNET_RESERVED_PORTAL);
1980                 the_lnet.ln_push_target_handler = NULL;
1981         }
1982
1983         return rc;
1984 }
1985
1986 /* Clean up the push target. */
1987 static void lnet_push_target_fini(void)
1988 {
1989         if (!the_lnet.ln_push_target)
1990                 return;
1991
1992         /* Unlink and invalidate to prevent new references. */
1993         LNetMDUnlink(the_lnet.ln_push_target_md);
1994         LNetInvalidateMDHandle(&the_lnet.ln_push_target_md);
1995
1996         /* Wait for the unlink to complete. */
1997         wait_var_event_warning(&the_lnet.ln_push_target->pb_refcnt,
1998                                atomic_read(&the_lnet.ln_push_target->pb_refcnt) <= 1,
1999                                "Still waiting for ping data MD to unlink\n");
2000
2001         /* Drop ref set by lnet_ping_buffer_alloc() */
2002         lnet_ping_buffer_decref(the_lnet.ln_push_target);
2003         the_lnet.ln_push_target = NULL;
2004         the_lnet.ln_push_target_nnis = 0;
2005
2006         LNetClearLazyPortal(LNET_RESERVED_PORTAL);
2007         lnet_assert_handler_unused(the_lnet.ln_push_target_handler);
2008         the_lnet.ln_push_target_handler = NULL;
2009 }
2010
2011 static int
2012 lnet_ni_tq_credits(struct lnet_ni *ni)
2013 {
2014         int     credits;
2015
2016         LASSERT(ni->ni_ncpts >= 1);
2017
2018         if (ni->ni_ncpts == 1)
2019                 return ni->ni_net->net_tunables.lct_max_tx_credits;
2020
2021         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
2022         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
2023         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
2024
2025         return credits;
2026 }
2027
2028 static void
2029 lnet_ni_unlink_locked(struct lnet_ni *ni)
2030 {
2031         /* move it to zombie list and nobody can find it anymore */
2032         LASSERT(!list_empty(&ni->ni_netlist));
2033         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
2034         lnet_ni_decref_locked(ni, 0);
2035 }
2036
2037 static void
2038 lnet_clear_zombies_nis_locked(struct lnet_net *net)
2039 {
2040         int             i;
2041         int             islo;
2042         struct lnet_ni  *ni;
2043         struct list_head *zombie_list = &net->net_ni_zombie;
2044
2045         /*
2046          * Now wait for the NIs I just nuked to show up on the zombie
2047          * list and shut them down in guaranteed thread context
2048          */
2049         i = 2;
2050         while (!list_empty(zombie_list)) {
2051                 int     *ref;
2052                 int     j;
2053
2054                 ni = list_entry(zombie_list->next,
2055                                 struct lnet_ni, ni_netlist);
2056                 list_del_init(&ni->ni_netlist);
2057                 /* the ni should be in deleting state. If it's not it's
2058                  * a bug */
2059                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
2060                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
2061                         if (*ref == 0)
2062                                 continue;
2063                         /* still busy, add it back to zombie list */
2064                         list_add(&ni->ni_netlist, zombie_list);
2065                         break;
2066                 }
2067
2068                 if (!list_empty(&ni->ni_netlist)) {
2069                         lnet_net_unlock(LNET_LOCK_EX);
2070                         ++i;
2071                         if ((i & (-i)) == i) {
2072                                 CDEBUG(D_WARNING,
2073                                        "Waiting for zombie LNI %s\n",
2074                                        libcfs_nid2str(ni->ni_nid));
2075                         }
2076                         schedule_timeout_uninterruptible(cfs_time_seconds(1));
2077                         lnet_net_lock(LNET_LOCK_EX);
2078                         continue;
2079                 }
2080
2081                 lnet_net_unlock(LNET_LOCK_EX);
2082
2083                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
2084
2085                 LASSERT(!in_interrupt());
2086                 /* Holding the mutex makes it safe for lnd_shutdown
2087                  * to call module_put(). Module unload cannot finish
2088                  * until lnet_unregister_lnd() completes, and that
2089                  * requires the mutex.
2090                  */
2091                 mutex_lock(&the_lnet.ln_lnd_mutex);
2092                 (net->net_lnd->lnd_shutdown)(ni);
2093                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2094
2095                 if (!islo)
2096                         CDEBUG(D_LNI, "Removed LNI %s\n",
2097                               libcfs_nid2str(ni->ni_nid));
2098
2099                 lnet_ni_free(ni);
2100                 i = 2;
2101                 lnet_net_lock(LNET_LOCK_EX);
2102         }
2103 }
2104
2105 /* shutdown down the NI and release refcount */
2106 static void
2107 lnet_shutdown_lndni(struct lnet_ni *ni)
2108 {
2109         int i;
2110         struct lnet_net *net = ni->ni_net;
2111
2112         lnet_net_lock(LNET_LOCK_EX);
2113         lnet_ni_lock(ni);
2114         ni->ni_state = LNET_NI_STATE_DELETING;
2115         lnet_ni_unlock(ni);
2116         lnet_ni_unlink_locked(ni);
2117         lnet_incr_dlc_seq();
2118         lnet_net_unlock(LNET_LOCK_EX);
2119
2120         /* clear messages for this NI on the lazy portal */
2121         for (i = 0; i < the_lnet.ln_nportals; i++)
2122                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
2123
2124         lnet_net_lock(LNET_LOCK_EX);
2125         lnet_clear_zombies_nis_locked(net);
2126         lnet_net_unlock(LNET_LOCK_EX);
2127 }
2128
2129 static void
2130 lnet_shutdown_lndnet(struct lnet_net *net)
2131 {
2132         struct lnet_ni *ni;
2133
2134         lnet_net_lock(LNET_LOCK_EX);
2135
2136         list_del_init(&net->net_list);
2137
2138         while (!list_empty(&net->net_ni_list)) {
2139                 ni = list_entry(net->net_ni_list.next,
2140                                 struct lnet_ni, ni_netlist);
2141                 lnet_net_unlock(LNET_LOCK_EX);
2142                 lnet_shutdown_lndni(ni);
2143                 lnet_net_lock(LNET_LOCK_EX);
2144         }
2145
2146         lnet_net_unlock(LNET_LOCK_EX);
2147
2148         /* Do peer table cleanup for this net */
2149         lnet_peer_tables_cleanup(net);
2150
2151         lnet_net_free(net);
2152 }
2153
2154 static void
2155 lnet_shutdown_lndnets(void)
2156 {
2157         struct lnet_net *net;
2158         LIST_HEAD(resend);
2159         struct lnet_msg *msg, *tmp;
2160
2161         /* NB called holding the global mutex */
2162
2163         /* All quiet on the API front */
2164         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
2165         LASSERT(the_lnet.ln_refcount == 0);
2166
2167         lnet_net_lock(LNET_LOCK_EX);
2168         the_lnet.ln_state = LNET_STATE_STOPPING;
2169
2170         /*
2171          * move the nets to the zombie list to avoid them being
2172          * picked up for new work. LONET is also included in the
2173          * Nets that will be moved to the zombie list
2174          */
2175         list_splice_init(&the_lnet.ln_nets, &the_lnet.ln_net_zombie);
2176
2177         /* Drop the cached loopback Net. */
2178         if (the_lnet.ln_loni != NULL) {
2179                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
2180                 the_lnet.ln_loni = NULL;
2181         }
2182         lnet_net_unlock(LNET_LOCK_EX);
2183
2184         /* iterate through the net zombie list and delete each net */
2185         while (!list_empty(&the_lnet.ln_net_zombie)) {
2186                 net = list_entry(the_lnet.ln_net_zombie.next,
2187                                  struct lnet_net, net_list);
2188                 lnet_shutdown_lndnet(net);
2189         }
2190
2191         spin_lock(&the_lnet.ln_msg_resend_lock);
2192         list_splice(&the_lnet.ln_msg_resend, &resend);
2193         spin_unlock(&the_lnet.ln_msg_resend_lock);
2194
2195         list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
2196                 list_del_init(&msg->msg_list);
2197                 msg->msg_no_resend = true;
2198                 lnet_finalize(msg, -ECANCELED);
2199         }
2200
2201         lnet_net_lock(LNET_LOCK_EX);
2202         the_lnet.ln_state = LNET_STATE_SHUTDOWN;
2203         lnet_net_unlock(LNET_LOCK_EX);
2204 }
2205
2206 static int
2207 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
2208 {
2209         int                     rc = -EINVAL;
2210         struct lnet_tx_queue    *tq;
2211         int                     i;
2212         struct lnet_net         *net = ni->ni_net;
2213
2214         mutex_lock(&the_lnet.ln_lnd_mutex);
2215
2216         if (tun) {
2217                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
2218                 ni->ni_lnd_tunables_set = true;
2219         }
2220
2221         rc = (net->net_lnd->lnd_startup)(ni);
2222
2223         mutex_unlock(&the_lnet.ln_lnd_mutex);
2224
2225         if (rc != 0) {
2226                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
2227                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
2228                 goto failed0;
2229         }
2230
2231         lnet_ni_lock(ni);
2232         ni->ni_state = LNET_NI_STATE_ACTIVE;
2233         lnet_ni_unlock(ni);
2234
2235         /* We keep a reference on the loopback net through the loopback NI */
2236         if (net->net_lnd->lnd_type == LOLND) {
2237                 lnet_ni_addref(ni);
2238                 LASSERT(the_lnet.ln_loni == NULL);
2239                 the_lnet.ln_loni = ni;
2240                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
2241                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
2242                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
2243                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
2244                 return 0;
2245         }
2246
2247         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
2248             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
2249                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
2250                                    libcfs_lnd2str(net->net_lnd->lnd_type),
2251                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
2252                                         "" : "per-peer ");
2253                 /* shutdown the NI since if we get here then it must've already
2254                  * been started
2255                  */
2256                 lnet_shutdown_lndni(ni);
2257                 return -EINVAL;
2258         }
2259
2260         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
2261                 tq->tq_credits_min =
2262                 tq->tq_credits_max =
2263                 tq->tq_credits = lnet_ni_tq_credits(ni);
2264         }
2265
2266         atomic_set(&ni->ni_tx_credits,
2267                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
2268         atomic_set(&ni->ni_healthv, LNET_MAX_HEALTH_VALUE);
2269
2270         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
2271                 libcfs_nid2str(ni->ni_nid),
2272                 ni->ni_net->net_tunables.lct_peer_tx_credits,
2273                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
2274                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
2275                 ni->ni_net->net_tunables.lct_peer_timeout);
2276
2277         return 0;
2278 failed0:
2279         lnet_ni_free(ni);
2280         return rc;
2281 }
2282
2283 static int
2284 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
2285 {
2286         struct lnet_ni *ni;
2287         struct lnet_net *net_l = NULL;
2288         LIST_HEAD(local_ni_list);
2289         int rc;
2290         int ni_count = 0;
2291         __u32 lnd_type;
2292         const struct lnet_lnd  *lnd;
2293         int peer_timeout =
2294                 net->net_tunables.lct_peer_timeout;
2295         int maxtxcredits =
2296                 net->net_tunables.lct_max_tx_credits;
2297         int peerrtrcredits =
2298                 net->net_tunables.lct_peer_rtr_credits;
2299
2300         /*
2301          * make sure that this net is unique. If it isn't then
2302          * we are adding interfaces to an already existing network, and
2303          * 'net' is just a convenient way to pass in the list.
2304          * if it is unique we need to find the LND and load it if
2305          * necessary.
2306          */
2307         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
2308                 lnd_type = LNET_NETTYP(net->net_id);
2309
2310                 mutex_lock(&the_lnet.ln_lnd_mutex);
2311                 lnd = lnet_find_lnd_by_type(lnd_type);
2312
2313                 if (lnd == NULL) {
2314                         mutex_unlock(&the_lnet.ln_lnd_mutex);
2315                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
2316                         mutex_lock(&the_lnet.ln_lnd_mutex);
2317
2318                         lnd = lnet_find_lnd_by_type(lnd_type);
2319                         if (lnd == NULL) {
2320                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2321                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
2322                                 libcfs_lnd2str(lnd_type),
2323                                 libcfs_lnd2modname(lnd_type), rc);
2324 #ifndef HAVE_MODULE_LOADING_SUPPORT
2325                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
2326                                                 "compiled with kernel module "
2327                                                 "loading support.");
2328 #endif
2329                                 rc = -EINVAL;
2330                                 goto failed0;
2331                         }
2332                 }
2333
2334                 net->net_lnd = lnd;
2335
2336                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2337
2338                 net_l = net;
2339         }
2340
2341         /*
2342          * net_l: if the network being added is unique then net_l
2343          *        will point to that network
2344          *        if the network being added is not unique then
2345          *        net_l points to the existing network.
2346          *
2347          * When we enter the loop below, we'll pick NIs off he
2348          * network beign added and start them up, then add them to
2349          * a local ni list. Once we've successfully started all
2350          * the NIs then we join the local NI list (of started up
2351          * networks) with the net_l->net_ni_list, which should
2352          * point to the correct network to add the new ni list to
2353          *
2354          * If any of the new NIs fail to start up, then we want to
2355          * iterate through the local ni list, which should include
2356          * any NIs which were successfully started up, and shut
2357          * them down.
2358          *
2359          * After than we want to delete the network being added,
2360          * to avoid a memory leak.
2361          */
2362
2363         /*
2364          * When a network uses TCP bonding then all its interfaces
2365          * must be specified when the network is first defined: the
2366          * TCP bonding code doesn't allow for interfaces to be added
2367          * or removed.
2368          */
2369         if (net_l != net && net_l != NULL && use_tcp_bonding &&
2370             LNET_NETTYP(net_l->net_id) == SOCKLND) {
2371                 rc = -EINVAL;
2372                 goto failed0;
2373         }
2374
2375         while (!list_empty(&net->net_ni_added)) {
2376                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
2377                                 ni_netlist);
2378                 list_del_init(&ni->ni_netlist);
2379
2380                 /* make sure that the the NI we're about to start
2381                  * up is actually unique. if it's not fail. */
2382                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
2383                                         ni->ni_interfaces[0])) {
2384                         rc = -EEXIST;
2385                         goto failed1;
2386                 }
2387
2388                 /* adjust the pointer the parent network, just in case it
2389                  * the net is a duplicate */
2390                 ni->ni_net = net_l;
2391
2392                 rc = lnet_startup_lndni(ni, tun);
2393
2394                 if (rc < 0)
2395                         goto failed1;
2396
2397                 lnet_ni_addref(ni);
2398                 list_add_tail(&ni->ni_netlist, &local_ni_list);
2399
2400                 ni_count++;
2401         }
2402
2403         lnet_net_lock(LNET_LOCK_EX);
2404         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
2405         lnet_incr_dlc_seq();
2406         lnet_net_unlock(LNET_LOCK_EX);
2407
2408         /* if the network is not unique then we don't want to keep
2409          * it around after we're done. Free it. Otherwise add that
2410          * net to the global the_lnet.ln_nets */
2411         if (net_l != net && net_l != NULL) {
2412                 /*
2413                  * TODO - note. currently the tunables can not be updated
2414                  * once added
2415                  */
2416                 lnet_net_free(net);
2417         } else {
2418                 /*
2419                  * restore tunables after it has been overwitten by the
2420                  * lnd
2421                  */
2422                 if (peer_timeout != -1)
2423                         net->net_tunables.lct_peer_timeout = peer_timeout;
2424                 if (maxtxcredits != -1)
2425                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
2426                 if (peerrtrcredits != -1)
2427                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
2428
2429                 lnet_net_lock(LNET_LOCK_EX);
2430                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
2431                 lnet_net_unlock(LNET_LOCK_EX);
2432         }
2433
2434         /* update net count */
2435         lnet_current_net_count = lnet_get_net_count();
2436
2437         return ni_count;
2438
2439 failed1:
2440         /*
2441          * shutdown the new NIs that are being started up
2442          * free the NET being started
2443          */
2444         while (!list_empty(&local_ni_list)) {
2445                 ni = list_entry(local_ni_list.next, struct lnet_ni,
2446                                 ni_netlist);
2447
2448                 lnet_shutdown_lndni(ni);
2449         }
2450
2451 failed0:
2452         lnet_net_free(net);
2453
2454         return rc;
2455 }
2456
2457 static int
2458 lnet_startup_lndnets(struct list_head *netlist)
2459 {
2460         struct lnet_net         *net;
2461         int                     rc;
2462         int                     ni_count = 0;
2463
2464         /*
2465          * Change to running state before bringing up the LNDs. This
2466          * allows lnet_shutdown_lndnets() to assert that we've passed
2467          * through here.
2468          */
2469         lnet_net_lock(LNET_LOCK_EX);
2470         the_lnet.ln_state = LNET_STATE_RUNNING;
2471         lnet_net_unlock(LNET_LOCK_EX);
2472
2473         while (!list_empty(netlist)) {
2474                 net = list_entry(netlist->next, struct lnet_net, net_list);
2475                 list_del_init(&net->net_list);
2476
2477                 rc = lnet_startup_lndnet(net, NULL);
2478
2479                 if (rc < 0)
2480                         goto failed;
2481
2482                 ni_count += rc;
2483         }
2484
2485         return ni_count;
2486 failed:
2487         lnet_shutdown_lndnets();
2488
2489         return rc;
2490 }
2491
2492 /**
2493  * Initialize LNet library.
2494  *
2495  * Automatically called at module loading time. Caller has to call
2496  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
2497  * latter returned 0. It must be called exactly once.
2498  *
2499  * \retval 0 on success
2500  * \retval -ve on failures.
2501  */
2502 int lnet_lib_init(void)
2503 {
2504         int rc;
2505
2506         lnet_assert_wire_constants();
2507
2508         /* refer to global cfs_cpt_table for now */
2509         the_lnet.ln_cpt_table = cfs_cpt_tab;
2510         the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_tab);
2511
2512         LASSERT(the_lnet.ln_cpt_number > 0);
2513         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
2514                 /* we are under risk of consuming all lh_cookie */
2515                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
2516                        "please change setting of CPT-table and retry\n",
2517                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
2518                 return -E2BIG;
2519         }
2520
2521         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
2522                 the_lnet.ln_cpt_bits++;
2523
2524         rc = lnet_create_locks();
2525         if (rc != 0) {
2526                 CERROR("Can't create LNet global locks: %d\n", rc);
2527                 return rc;
2528         }
2529
2530         the_lnet.ln_refcount = 0;
2531         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
2532         INIT_LIST_HEAD(&the_lnet.ln_msg_resend);
2533
2534         /* The hash table size is the number of bits it takes to express the set
2535          * ln_num_routes, minus 1 (better to under estimate than over so we
2536          * don't waste memory). */
2537         if (rnet_htable_size <= 0)
2538                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
2539         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
2540                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
2541         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
2542                                            order_base_2(rnet_htable_size) - 1);
2543
2544         /* All LNDs apart from the LOLND are in separate modules.  They
2545          * register themselves when their module loads, and unregister
2546          * themselves when their module is unloaded. */
2547         lnet_register_lnd(&the_lolnd);
2548         return 0;
2549 }
2550
2551 /**
2552  * Finalize LNet library.
2553  *
2554  * \pre lnet_lib_init() called with success.
2555  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
2556  *
2557  * As this happens at module-unload, all lnds must already be unloaded,
2558  * so they must already be unregistered.
2559  */
2560 void lnet_lib_exit(void)
2561 {
2562         int i;
2563
2564         LASSERT(the_lnet.ln_refcount == 0);
2565         lnet_unregister_lnd(&the_lolnd);
2566         for (i = 0; i < NUM_LNDS; i++)
2567                 LASSERT(!the_lnet.ln_lnds[i]);
2568         lnet_destroy_locks();
2569 }
2570
2571 /**
2572  * Set LNet PID and start LNet interfaces, routing, and forwarding.
2573  *
2574  * Users must call this function at least once before any other functions.
2575  * For each successful call there must be a corresponding call to
2576  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
2577  * ignored.
2578  *
2579  * The PID used by LNet may be different from the one requested.
2580  * See LNetGetId().
2581  *
2582  * \param requested_pid PID requested by the caller.
2583  *
2584  * \return >= 0 on success, and < 0 error code on failures.
2585  */
2586 int
2587 LNetNIInit(lnet_pid_t requested_pid)
2588 {
2589         int                     im_a_router = 0;
2590         int                     rc;
2591         int                     ni_count;
2592         struct lnet_ping_buffer *pbuf;
2593         struct lnet_handle_md   ping_mdh;
2594         LIST_HEAD(net_head);
2595         struct lnet_net         *net;
2596
2597         mutex_lock(&the_lnet.ln_api_mutex);
2598
2599         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
2600
2601         if (the_lnet.ln_refcount > 0) {
2602                 rc = the_lnet.ln_refcount++;
2603                 mutex_unlock(&the_lnet.ln_api_mutex);
2604                 return rc;
2605         }
2606
2607         rc = lnet_prepare(requested_pid);
2608         if (rc != 0) {
2609                 mutex_unlock(&the_lnet.ln_api_mutex);
2610                 return rc;
2611         }
2612
2613         /* create a network for Loopback network */
2614         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
2615         if (net == NULL) {
2616                 rc = -ENOMEM;
2617                 goto err_empty_list;
2618         }
2619
2620         /* Add in the loopback NI */
2621         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
2622                 rc = -ENOMEM;
2623                 goto err_empty_list;
2624         }
2625
2626         /* If LNet is being initialized via DLC it is possible
2627          * that the user requests not to load module parameters (ones which
2628          * are supported by DLC) on initialization.  Therefore, make sure not
2629          * to load networks, routes and forwarding from module parameters
2630          * in this case.  On cleanup in case of failure only clean up
2631          * routes if it has been loaded */
2632         if (!the_lnet.ln_nis_from_mod_params) {
2633                 rc = lnet_parse_networks(&net_head, lnet_get_networks(),
2634                                          use_tcp_bonding);
2635                 if (rc < 0)
2636                         goto err_empty_list;
2637         }
2638
2639         ni_count = lnet_startup_lndnets(&net_head);
2640         if (ni_count < 0) {
2641                 rc = ni_count;
2642                 goto err_empty_list;
2643         }
2644
2645         if (!the_lnet.ln_nis_from_mod_params) {
2646                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
2647                 if (rc != 0)
2648                         goto err_shutdown_lndnis;
2649
2650                 rc = lnet_rtrpools_alloc(im_a_router);
2651                 if (rc != 0)
2652                         goto err_destroy_routes;
2653         }
2654
2655         rc = lnet_acceptor_start();
2656         if (rc != 0)
2657                 goto err_destroy_routes;
2658
2659         the_lnet.ln_refcount = 1;
2660         /* Now I may use my own API functions... */
2661
2662         rc = lnet_ping_target_setup(&pbuf, &ping_mdh, ni_count, true);
2663         if (rc != 0)
2664                 goto err_acceptor_stop;
2665
2666         lnet_ping_target_update(pbuf, ping_mdh);
2667
2668         the_lnet.ln_mt_handler = lnet_mt_event_handler;
2669
2670         rc = lnet_push_target_init();
2671         if (rc != 0)
2672                 goto err_stop_ping;
2673
2674         rc = lnet_peer_discovery_start();
2675         if (rc != 0)
2676                 goto err_destroy_push_target;
2677
2678         rc = lnet_monitor_thr_start();
2679         if (rc != 0)
2680                 goto err_stop_discovery_thr;
2681
2682         lnet_fault_init();
2683         lnet_router_debugfs_init();
2684
2685         mutex_unlock(&the_lnet.ln_api_mutex);
2686
2687         complete_all(&the_lnet.ln_started);
2688
2689         /* wait for all routers to start */
2690         lnet_wait_router_start();
2691
2692         return 0;
2693
2694 err_stop_discovery_thr:
2695         lnet_peer_discovery_stop();
2696 err_destroy_push_target:
2697         lnet_push_target_fini();
2698 err_stop_ping:
2699         lnet_ping_target_fini();
2700 err_acceptor_stop:
2701         the_lnet.ln_refcount = 0;
2702         lnet_acceptor_stop();
2703 err_destroy_routes:
2704         if (!the_lnet.ln_nis_from_mod_params)
2705                 lnet_destroy_routes();
2706 err_shutdown_lndnis:
2707         lnet_shutdown_lndnets();
2708 err_empty_list:
2709         lnet_unprepare();
2710         LASSERT(rc < 0);
2711         mutex_unlock(&the_lnet.ln_api_mutex);
2712         while (!list_empty(&net_head)) {
2713                 struct lnet_net *net;
2714
2715                 net = list_entry(net_head.next, struct lnet_net, net_list);
2716                 list_del_init(&net->net_list);
2717                 lnet_net_free(net);
2718         }
2719         return rc;
2720 }
2721 EXPORT_SYMBOL(LNetNIInit);
2722
2723 /**
2724  * Stop LNet interfaces, routing, and forwarding.
2725  *
2726  * Users must call this function once for each successful call to LNetNIInit().
2727  * Once the LNetNIFini() operation has been started, the results of pending
2728  * API operations are undefined.
2729  *
2730  * \return always 0 for current implementation.
2731  */
2732 int
2733 LNetNIFini(void)
2734 {
2735         mutex_lock(&the_lnet.ln_api_mutex);
2736
2737         LASSERT(the_lnet.ln_refcount > 0);
2738
2739         if (the_lnet.ln_refcount != 1) {
2740                 the_lnet.ln_refcount--;
2741         } else {
2742                 LASSERT(!the_lnet.ln_niinit_self);
2743
2744                 lnet_fault_fini();
2745
2746                 lnet_router_debugfs_fini();
2747                 lnet_monitor_thr_stop();
2748                 lnet_peer_discovery_stop();
2749                 lnet_push_target_fini();
2750                 lnet_ping_target_fini();
2751
2752                 /* Teardown fns that use my own API functions BEFORE here */
2753                 the_lnet.ln_refcount = 0;
2754
2755                 lnet_acceptor_stop();
2756                 lnet_destroy_routes();
2757                 lnet_shutdown_lndnets();
2758                 lnet_unprepare();
2759         }
2760
2761         mutex_unlock(&the_lnet.ln_api_mutex);
2762         return 0;
2763 }
2764 EXPORT_SYMBOL(LNetNIFini);
2765
2766 /**
2767  * Grabs the ni data from the ni structure and fills the out
2768  * parameters
2769  *
2770  * \param[in] ni network        interface structure
2771  * \param[out] cfg_ni           NI config information
2772  * \param[out] tun              network and LND tunables
2773  */
2774 static void
2775 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
2776                    struct lnet_ioctl_config_lnd_tunables *tun,
2777                    struct lnet_ioctl_element_stats *stats,
2778                    __u32 tun_size)
2779 {
2780         size_t min_size = 0;
2781         int i;
2782
2783         if (!ni || !cfg_ni || !tun)
2784                 return;
2785
2786         if (ni->ni_interfaces[0] != NULL) {
2787                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2788                         if (ni->ni_interfaces[i] != NULL) {
2789                                 strncpy(cfg_ni->lic_ni_intf[i],
2790                                         ni->ni_interfaces[i],
2791                                         sizeof(cfg_ni->lic_ni_intf[i]));
2792                         }
2793                 }
2794         }
2795
2796         cfg_ni->lic_nid = ni->ni_nid;
2797         if (ni->ni_nid == LNET_NID_LO_0)
2798                 cfg_ni->lic_status = LNET_NI_STATUS_UP;
2799         else
2800                 cfg_ni->lic_status = ni->ni_status->ns_status;
2801         cfg_ni->lic_tcp_bonding = use_tcp_bonding;
2802         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
2803
2804         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
2805
2806         if (stats) {
2807                 stats->iel_send_count = lnet_sum_stats(&ni->ni_stats,
2808                                                        LNET_STATS_TYPE_SEND);
2809                 stats->iel_recv_count = lnet_sum_stats(&ni->ni_stats,
2810                                                        LNET_STATS_TYPE_RECV);
2811                 stats->iel_drop_count = lnet_sum_stats(&ni->ni_stats,
2812                                                        LNET_STATS_TYPE_DROP);
2813         }
2814
2815         /*
2816          * tun->lt_tun will always be present, but in order to be
2817          * backwards compatible, we need to deal with the cases when
2818          * tun->lt_tun is smaller than what the kernel has, because it
2819          * comes from an older version of a userspace program, then we'll
2820          * need to copy as much information as we have available space.
2821          */
2822         min_size = tun_size - sizeof(tun->lt_cmn);
2823         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
2824
2825         /* copy over the cpts */
2826         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
2827             ni->ni_cpts == NULL)  {
2828                 for (i = 0; i < ni->ni_ncpts; i++)
2829                         cfg_ni->lic_cpts[i] = i;
2830         } else {
2831                 for (i = 0;
2832                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
2833                      i < LNET_MAX_SHOW_NUM_CPT;
2834                      i++)
2835                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
2836         }
2837         cfg_ni->lic_ncpts = ni->ni_ncpts;
2838 }
2839
2840 /**
2841  * NOTE: This is a legacy function left in the code to be backwards
2842  * compatible with older userspace programs. It should eventually be
2843  * removed.
2844  *
2845  * Grabs the ni data from the ni structure and fills the out
2846  * parameters
2847  *
2848  * \param[in] ni network        interface structure
2849  * \param[out] config           config information
2850  */
2851 static void
2852 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
2853                          struct lnet_ioctl_config_data *config)
2854 {
2855         struct lnet_ioctl_net_config *net_config;
2856         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
2857         size_t min_size, tunable_size = 0;
2858         int i;
2859
2860         if (!ni || !config)
2861                 return;
2862
2863         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
2864         if (!net_config)
2865                 return;
2866
2867         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
2868                      ARRAY_SIZE(net_config->ni_interfaces));
2869
2870         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2871                 if (!ni->ni_interfaces[i])
2872                         break;
2873
2874                 strncpy(net_config->ni_interfaces[i],
2875                         ni->ni_interfaces[i],
2876                         sizeof(net_config->ni_interfaces[i]));
2877         }
2878
2879         config->cfg_nid = ni->ni_nid;
2880         config->cfg_config_u.cfg_net.net_peer_timeout =
2881                 ni->ni_net->net_tunables.lct_peer_timeout;
2882         config->cfg_config_u.cfg_net.net_max_tx_credits =
2883                 ni->ni_net->net_tunables.lct_max_tx_credits;
2884         config->cfg_config_u.cfg_net.net_peer_tx_credits =
2885                 ni->ni_net->net_tunables.lct_peer_tx_credits;
2886         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
2887                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
2888
2889         if (ni->ni_nid == LNET_NID_LO_0)
2890                 net_config->ni_status = LNET_NI_STATUS_UP;
2891         else
2892                 net_config->ni_status = ni->ni_status->ns_status;
2893
2894         if (ni->ni_cpts) {
2895                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
2896
2897                 for (i = 0; i < num_cpts; i++)
2898                         net_config->ni_cpts[i] = ni->ni_cpts[i];
2899
2900                 config->cfg_ncpts = num_cpts;
2901         }
2902
2903         /*
2904          * See if user land tools sent in a newer and larger version
2905          * of struct lnet_tunables than what the kernel uses.
2906          */
2907         min_size = sizeof(*config) + sizeof(*net_config);
2908
2909         if (config->cfg_hdr.ioc_len > min_size)
2910                 tunable_size = config->cfg_hdr.ioc_len - min_size;
2911
2912         /* Don't copy too much data to user space */
2913         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
2914         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
2915
2916         if (lnd_cfg && min_size) {
2917                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
2918                 config->cfg_config_u.cfg_net.net_interface_count = 1;
2919
2920                 /* Tell user land that kernel side has less data */
2921                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
2922                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
2923                         config->cfg_hdr.ioc_len -= min_size;
2924                 }
2925         }
2926 }
2927
2928 struct lnet_ni *
2929 lnet_get_ni_idx_locked(int idx)
2930 {
2931         struct lnet_ni          *ni;
2932         struct lnet_net         *net;
2933
2934         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2935                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2936                         if (idx-- == 0)
2937                                 return ni;
2938                 }
2939         }
2940
2941         return NULL;
2942 }
2943
2944 struct lnet_ni *
2945 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
2946 {
2947         struct lnet_ni          *ni;
2948         struct lnet_net         *net = mynet;
2949
2950         /*
2951          * It is possible that the net has been cleaned out while there is
2952          * a message being sent. This function accessed the net without
2953          * checking if the list is empty
2954          */
2955         if (prev == NULL) {
2956                 if (net == NULL)
2957                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
2958                                         net_list);
2959                 if (list_empty(&net->net_ni_list))
2960                         return NULL;
2961                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2962                                 ni_netlist);
2963
2964                 return ni;
2965         }
2966
2967         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
2968                 /* if you reached the end of the ni list and the net is
2969                  * specified, then there are no more nis in that net */
2970                 if (net != NULL)
2971                         return NULL;
2972
2973                 /* we reached the end of this net ni list. move to the
2974                  * next net */
2975                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
2976                         /* no more nets and no more NIs. */
2977                         return NULL;
2978
2979                 /* get the next net */
2980                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
2981                                  net_list);
2982                 if (list_empty(&net->net_ni_list))
2983                         return NULL;
2984                 /* get the ni on it */
2985                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2986                                 ni_netlist);
2987
2988                 return ni;
2989         }
2990
2991         if (list_empty(&prev->ni_netlist))
2992                 return NULL;
2993
2994         /* there are more nis left */
2995         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
2996
2997         return ni;
2998 }
2999
3000 int
3001 lnet_get_net_config(struct lnet_ioctl_config_data *config)
3002 {
3003         struct lnet_ni *ni;
3004         int cpt;
3005         int rc = -ENOENT;
3006         int idx = config->cfg_count;
3007
3008         cpt = lnet_net_lock_current();
3009
3010         ni = lnet_get_ni_idx_locked(idx);
3011
3012         if (ni != NULL) {
3013                 rc = 0;
3014                 lnet_ni_lock(ni);
3015                 lnet_fill_ni_info_legacy(ni, config);
3016                 lnet_ni_unlock(ni);
3017         }
3018
3019         lnet_net_unlock(cpt);
3020         return rc;
3021 }
3022
3023 int
3024 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
3025                    struct lnet_ioctl_config_lnd_tunables *tun,
3026                    struct lnet_ioctl_element_stats *stats,
3027                    __u32 tun_size)
3028 {
3029         struct lnet_ni          *ni;
3030         int                     cpt;
3031         int                     rc = -ENOENT;
3032
3033         if (!cfg_ni || !tun || !stats)
3034                 return -EINVAL;
3035
3036         cpt = lnet_net_lock_current();
3037
3038         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
3039
3040         if (ni) {
3041                 rc = 0;
3042                 lnet_ni_lock(ni);
3043                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
3044                 lnet_ni_unlock(ni);
3045         }
3046
3047         lnet_net_unlock(cpt);
3048         return rc;
3049 }
3050
3051 int lnet_get_ni_stats(struct lnet_ioctl_element_msg_stats *msg_stats)
3052 {
3053         struct lnet_ni *ni;
3054         int cpt;
3055         int rc = -ENOENT;
3056
3057         if (!msg_stats)
3058                 return -EINVAL;
3059
3060         cpt = lnet_net_lock_current();
3061
3062         ni = lnet_get_ni_idx_locked(msg_stats->im_idx);
3063
3064         if (ni) {
3065                 lnet_usr_translate_stats(msg_stats, &ni->ni_stats);
3066                 rc = 0;
3067         }
3068
3069         lnet_net_unlock(cpt);
3070
3071         return rc;
3072 }
3073
3074 static int lnet_add_net_common(struct lnet_net *net,
3075                                struct lnet_ioctl_config_lnd_tunables *tun)
3076 {
3077         __u32                   net_id;
3078         struct lnet_ping_buffer *pbuf;
3079         struct lnet_handle_md   ping_mdh;
3080         int                     rc;
3081         struct lnet_remotenet *rnet;
3082         int                     net_ni_count;
3083
3084         lnet_net_lock(LNET_LOCK_EX);
3085         rnet = lnet_find_rnet_locked(net->net_id);
3086         lnet_net_unlock(LNET_LOCK_EX);
3087         /*
3088          * make sure that the net added doesn't invalidate the current
3089          * configuration LNet is keeping
3090          */
3091         if (rnet) {
3092                 CERROR("Adding net %s will invalidate routing configuration\n",
3093                        libcfs_net2str(net->net_id));
3094                 lnet_net_free(net);
3095                 return -EUSERS;
3096         }
3097
3098         /*
3099          * make sure you calculate the correct number of slots in the ping
3100          * buffer. Since the ping info is a flattened list of all the NIs,
3101          * we should allocate enough slots to accomodate the number of NIs
3102          * which will be added.
3103          *
3104          * since ni hasn't been configured yet, use
3105          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
3106          */
3107         net_ni_count = lnet_get_net_ni_count_pre(net);
3108
3109         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3110                                     net_ni_count + lnet_get_ni_count(),
3111                                     false);
3112         if (rc < 0) {
3113                 lnet_net_free(net);
3114                 return rc;
3115         }
3116
3117         if (tun)
3118                 memcpy(&net->net_tunables,
3119                        &tun->lt_cmn, sizeof(net->net_tunables));
3120         else
3121                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
3122
3123         net_id = net->net_id;
3124
3125         rc = lnet_startup_lndnet(net,
3126                                  (tun) ? &tun->lt_tun : NULL);
3127         if (rc < 0)
3128                 goto failed;
3129
3130         lnet_net_lock(LNET_LOCK_EX);
3131         net = lnet_get_net_locked(net_id);
3132         lnet_net_unlock(LNET_LOCK_EX);
3133
3134         LASSERT(net);
3135
3136         /*
3137          * Start the acceptor thread if this is the first network
3138          * being added that requires the thread.
3139          */
3140         if (net->net_lnd->lnd_accept) {
3141                 rc = lnet_acceptor_start();
3142                 if (rc < 0) {
3143                         /* shutdown the net that we just started */
3144                         CERROR("Failed to start up acceptor thread\n");
3145                         lnet_shutdown_lndnet(net);
3146                         goto failed;
3147                 }
3148         }
3149
3150         lnet_net_lock(LNET_LOCK_EX);
3151         lnet_peer_net_added(net);
3152         lnet_net_unlock(LNET_LOCK_EX);
3153
3154         lnet_ping_target_update(pbuf, ping_mdh);
3155
3156         return 0;
3157
3158 failed:
3159         lnet_ping_md_unlink(pbuf, &ping_mdh);
3160         lnet_ping_buffer_decref(pbuf);
3161         return rc;
3162 }
3163
3164 static int lnet_handle_legacy_ip2nets(char *ip2nets,
3165                                       struct lnet_ioctl_config_lnd_tunables *tun)
3166 {
3167         struct lnet_net *net;
3168         const char *nets;
3169         int rc;
3170         LIST_HEAD(net_head);
3171
3172         rc = lnet_parse_ip2nets(&nets, ip2nets);
3173         if (rc < 0)
3174                 return rc;
3175
3176         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3177         if (rc < 0)
3178                 return rc;
3179
3180         mutex_lock(&the_lnet.ln_api_mutex);
3181         while (!list_empty(&net_head)) {
3182                 net = list_entry(net_head.next, struct lnet_net, net_list);
3183                 list_del_init(&net->net_list);
3184                 rc = lnet_add_net_common(net, tun);
3185                 if (rc < 0)
3186                         goto out;
3187         }
3188
3189 out:
3190         mutex_unlock(&the_lnet.ln_api_mutex);
3191
3192         while (!list_empty(&net_head)) {
3193                 net = list_entry(net_head.next, struct lnet_net, net_list);
3194                 list_del_init(&net->net_list);
3195                 lnet_net_free(net);
3196         }
3197         return rc;
3198 }
3199
3200 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
3201 {
3202         struct lnet_net *net;
3203         struct lnet_ni *ni;
3204         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3205         int rc, i;
3206         __u32 net_id, lnd_type;
3207
3208         /* get the tunables if they are available */
3209         if (conf->lic_cfg_hdr.ioc_len >=
3210             sizeof(*conf) + sizeof(*tun))
3211                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3212                         conf->lic_bulk;
3213
3214         /* handle legacy ip2nets from DLC */
3215         if (conf->lic_legacy_ip2nets[0] != '\0')
3216                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
3217                                                   tun);
3218
3219         net_id = LNET_NIDNET(conf->lic_nid);
3220         lnd_type = LNET_NETTYP(net_id);
3221
3222         if (!libcfs_isknown_lnd(lnd_type)) {
3223                 CERROR("No valid net and lnd information provided\n");
3224                 return -EINVAL;
3225         }
3226
3227         net = lnet_net_alloc(net_id, NULL);
3228         if (!net)
3229                 return -ENOMEM;
3230
3231         for (i = 0; i < conf->lic_ncpts; i++) {
3232                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
3233                         return -EINVAL;
3234         }
3235
3236         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
3237                                        conf->lic_ni_intf[0]);
3238         if (!ni)
3239                 return -ENOMEM;
3240
3241         mutex_lock(&the_lnet.ln_api_mutex);
3242
3243         rc = lnet_add_net_common(net, tun);
3244
3245         mutex_unlock(&the_lnet.ln_api_mutex);
3246
3247         return rc;
3248 }
3249
3250 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
3251 {
3252         struct lnet_net  *net;
3253         struct lnet_ni *ni;
3254         __u32 net_id = LNET_NIDNET(conf->lic_nid);
3255         struct lnet_ping_buffer *pbuf;
3256         struct lnet_handle_md  ping_mdh;
3257         int               rc;
3258         int               net_count;
3259         __u32             addr;
3260
3261         /* don't allow userspace to shutdown the LOLND */
3262         if (LNET_NETTYP(net_id) == LOLND)
3263                 return -EINVAL;
3264
3265         mutex_lock(&the_lnet.ln_api_mutex);
3266
3267         lnet_net_lock(0);
3268
3269         net = lnet_get_net_locked(net_id);
3270         if (!net) {
3271                 CERROR("net %s not found\n",
3272                        libcfs_net2str(net_id));
3273                 rc = -ENOENT;
3274                 goto unlock_net;
3275         }
3276
3277         addr = LNET_NIDADDR(conf->lic_nid);
3278         if (addr == 0) {
3279                 /* remove the entire net */
3280                 net_count = lnet_get_net_ni_count_locked(net);
3281
3282                 lnet_net_unlock(0);
3283
3284                 /* create and link a new ping info, before removing the old one */
3285                 rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3286                                         lnet_get_ni_count() - net_count,
3287                                         false);
3288                 if (rc != 0)
3289                         goto unlock_api_mutex;
3290
3291                 lnet_shutdown_lndnet(net);
3292
3293                 lnet_acceptor_stop();
3294
3295                 lnet_ping_target_update(pbuf, ping_mdh);
3296
3297                 goto unlock_api_mutex;
3298         }
3299
3300         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
3301         if (!ni) {
3302                 CERROR("nid %s not found\n",
3303                        libcfs_nid2str(conf->lic_nid));
3304                 rc = -ENOENT;
3305                 goto unlock_net;
3306         }
3307
3308         net_count = lnet_get_net_ni_count_locked(net);
3309
3310         lnet_net_unlock(0);
3311
3312         /* create and link a new ping info, before removing the old one */
3313         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3314                                   lnet_get_ni_count() - 1, false);
3315         if (rc != 0)
3316                 goto unlock_api_mutex;
3317
3318         lnet_shutdown_lndni(ni);
3319
3320         lnet_acceptor_stop();
3321
3322         lnet_ping_target_update(pbuf, ping_mdh);
3323
3324         /* check if the net is empty and remove it if it is */
3325         if (net_count == 1)
3326                 lnet_shutdown_lndnet(net);
3327
3328         goto unlock_api_mutex;
3329
3330 unlock_net:
3331         lnet_net_unlock(0);
3332 unlock_api_mutex:
3333         mutex_unlock(&the_lnet.ln_api_mutex);
3334
3335         return rc;
3336 }
3337
3338 /*
3339  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
3340  * They are only expected to be called for unique networks.
3341  * That can be as a result of older DLC library
3342  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
3343  */
3344 int
3345 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
3346 {
3347         struct lnet_net *net;
3348         LIST_HEAD(net_head);
3349         int rc;
3350         struct lnet_ioctl_config_lnd_tunables tun;
3351         const char *nets = conf->cfg_config_u.cfg_net.net_intf;
3352
3353         /* Create a net/ni structures for the network string */
3354         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3355         if (rc <= 0)
3356                 return rc == 0 ? -EINVAL : rc;
3357
3358         mutex_lock(&the_lnet.ln_api_mutex);
3359
3360         if (rc > 1) {
3361                 rc = -EINVAL; /* only add one network per call */
3362                 goto out_unlock_clean;
3363         }
3364
3365         net = list_entry(net_head.next, struct lnet_net, net_list);
3366         list_del_init(&net->net_list);
3367
3368         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
3369
3370         memset(&tun, 0, sizeof(tun));
3371
3372         tun.lt_cmn.lct_peer_timeout =
3373           conf->cfg_config_u.cfg_net.net_peer_timeout;
3374         tun.lt_cmn.lct_peer_tx_credits =
3375           conf->cfg_config_u.cfg_net.net_peer_tx_credits;
3376         tun.lt_cmn.lct_peer_rtr_credits =
3377           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
3378         tun.lt_cmn.lct_max_tx_credits =
3379           conf->cfg_config_u.cfg_net.net_max_tx_credits;
3380
3381         rc = lnet_add_net_common(net, &tun);
3382
3383 out_unlock_clean:
3384         mutex_unlock(&the_lnet.ln_api_mutex);
3385         while (!list_empty(&net_head)) {
3386                 /* net_head list is empty in success case */
3387                 net = list_entry(net_head.next, struct lnet_net, net_list);
3388                 list_del_init(&net->net_list);
3389                 lnet_net_free(net);
3390         }
3391         return rc;
3392 }
3393
3394 int
3395 lnet_dyn_del_net(__u32 net_id)
3396 {
3397         struct lnet_net  *net;
3398         struct lnet_ping_buffer *pbuf;
3399         struct lnet_handle_md ping_mdh;
3400         int               rc;
3401         int               net_ni_count;
3402
3403         /* don't allow userspace to shutdown the LOLND */
3404         if (LNET_NETTYP(net_id) == LOLND)
3405                 return -EINVAL;
3406
3407         mutex_lock(&the_lnet.ln_api_mutex);
3408
3409         lnet_net_lock(0);
3410
3411         net = lnet_get_net_locked(net_id);
3412         if (net == NULL) {
3413                 lnet_net_unlock(0);
3414                 rc = -EINVAL;
3415                 goto out;
3416         }
3417
3418         net_ni_count = lnet_get_net_ni_count_locked(net);
3419
3420         lnet_net_unlock(0);
3421
3422         /* create and link a new ping info, before removing the old one */
3423         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3424                                     lnet_get_ni_count() - net_ni_count, false);
3425         if (rc != 0)
3426                 goto out;
3427
3428         lnet_shutdown_lndnet(net);
3429
3430         lnet_acceptor_stop();
3431
3432         lnet_ping_target_update(pbuf, ping_mdh);
3433
3434 out:
3435         mutex_unlock(&the_lnet.ln_api_mutex);
3436
3437         return rc;
3438 }
3439
3440 void lnet_incr_dlc_seq(void)
3441 {
3442         atomic_inc(&lnet_dlc_seq_no);
3443 }
3444
3445 __u32 lnet_get_dlc_seq_locked(void)
3446 {
3447         return atomic_read(&lnet_dlc_seq_no);
3448 }
3449
3450 static void
3451 lnet_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3452 {
3453         struct lnet_net *net;
3454         struct lnet_ni *ni;
3455
3456         lnet_net_lock(LNET_LOCK_EX);
3457         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3458                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3459                         if (ni->ni_nid == nid || all) {
3460                                 atomic_set(&ni->ni_healthv, value);
3461                                 if (list_empty(&ni->ni_recovery) &&
3462                                     value < LNET_MAX_HEALTH_VALUE) {
3463                                         CERROR("manually adding local NI %s to recovery\n",
3464                                                libcfs_nid2str(ni->ni_nid));
3465                                         list_add_tail(&ni->ni_recovery,
3466                                                       &the_lnet.ln_mt_localNIRecovq);
3467                                         lnet_ni_addref_locked(ni, 0);
3468                                 }
3469                                 if (!all) {
3470                                         lnet_net_unlock(LNET_LOCK_EX);
3471                                         return;
3472                                 }
3473                         }
3474                 }
3475         }
3476         lnet_net_unlock(LNET_LOCK_EX);
3477 }
3478
3479 static int
3480 lnet_get_local_ni_hstats(struct lnet_ioctl_local_ni_hstats *stats)
3481 {
3482         int cpt, rc = 0;
3483         struct lnet_ni *ni;
3484         lnet_nid_t nid = stats->hlni_nid;
3485
3486         cpt = lnet_net_lock_current();
3487         ni = lnet_nid2ni_locked(nid, cpt);
3488
3489         if (!ni) {
3490                 rc = -ENOENT;
3491                 goto unlock;
3492         }
3493
3494         stats->hlni_local_interrupt = atomic_read(&ni->ni_hstats.hlt_local_interrupt);
3495         stats->hlni_local_dropped = atomic_read(&ni->ni_hstats.hlt_local_dropped);
3496         stats->hlni_local_aborted = atomic_read(&ni->ni_hstats.hlt_local_aborted);
3497         stats->hlni_local_no_route = atomic_read(&ni->ni_hstats.hlt_local_no_route);
3498         stats->hlni_local_timeout = atomic_read(&ni->ni_hstats.hlt_local_timeout);
3499         stats->hlni_local_error = atomic_read(&ni->ni_hstats.hlt_local_error);
3500         stats->hlni_health_value = atomic_read(&ni->ni_healthv);
3501
3502 unlock:
3503         lnet_net_unlock(cpt);
3504
3505         return rc;
3506 }
3507
3508 static int
3509 lnet_get_local_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3510 {
3511         struct lnet_ni *ni;
3512         int i = 0;
3513
3514         lnet_net_lock(LNET_LOCK_EX);
3515         list_for_each_entry(ni, &the_lnet.ln_mt_localNIRecovq, ni_recovery) {
3516                 list->rlst_nid_array[i] = ni->ni_nid;
3517                 i++;
3518                 if (i >= LNET_MAX_SHOW_NUM_NID)
3519                         break;
3520         }
3521         lnet_net_unlock(LNET_LOCK_EX);
3522         list->rlst_num_nids = i;
3523
3524         return 0;
3525 }
3526
3527 static int
3528 lnet_get_peer_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3529 {
3530         struct lnet_peer_ni *lpni;
3531         int i = 0;
3532
3533         lnet_net_lock(LNET_LOCK_EX);
3534         list_for_each_entry(lpni, &the_lnet.ln_mt_peerNIRecovq, lpni_recovery) {
3535                 list->rlst_nid_array[i] = lpni->lpni_nid;
3536                 i++;
3537                 if (i >= LNET_MAX_SHOW_NUM_NID)
3538                         break;
3539         }
3540         lnet_net_unlock(LNET_LOCK_EX);
3541         list->rlst_num_nids = i;
3542
3543         return 0;
3544 }
3545
3546 /**
3547  * LNet ioctl handler.
3548  *
3549  */
3550 int
3551 LNetCtl(unsigned int cmd, void *arg)
3552 {
3553         struct libcfs_ioctl_data *data = arg;
3554         struct lnet_ioctl_config_data *config;
3555         struct lnet_process_id    id = {0};
3556         struct lnet_ni           *ni;
3557         int                       rc;
3558
3559         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
3560                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
3561
3562         switch (cmd) {
3563         case IOC_LIBCFS_GET_NI:
3564                 rc = LNetGetId(data->ioc_count, &id);
3565                 data->ioc_nid = id.nid;
3566                 return rc;
3567
3568         case IOC_LIBCFS_FAIL_NID:
3569                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
3570
3571         case IOC_LIBCFS_ADD_ROUTE: {
3572                 /* default router sensitivity to 1 */
3573                 unsigned int sensitivity = 1;
3574                 config = arg;
3575
3576                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3577                         return -EINVAL;
3578
3579                 if (config->cfg_config_u.cfg_route.rtr_sensitivity) {
3580                         sensitivity =
3581                           config->cfg_config_u.cfg_route.rtr_sensitivity;
3582                 }
3583
3584                 mutex_lock(&the_lnet.ln_api_mutex);
3585                 rc = lnet_add_route(config->cfg_net,
3586                                     config->cfg_config_u.cfg_route.rtr_hop,
3587                                     config->cfg_nid,
3588                                     config->cfg_config_u.cfg_route.
3589                                         rtr_priority, sensitivity);
3590                 mutex_unlock(&the_lnet.ln_api_mutex);
3591                 return rc;
3592         }
3593
3594         case IOC_LIBCFS_DEL_ROUTE:
3595                 config = arg;
3596
3597                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3598                         return -EINVAL;
3599
3600                 mutex_lock(&the_lnet.ln_api_mutex);
3601                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
3602                 mutex_unlock(&the_lnet.ln_api_mutex);
3603                 return rc;
3604
3605         case IOC_LIBCFS_GET_ROUTE:
3606                 config = arg;
3607
3608                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3609                         return -EINVAL;
3610
3611                 mutex_lock(&the_lnet.ln_api_mutex);
3612                 rc = lnet_get_route(config->cfg_count,
3613                                     &config->cfg_net,
3614                                     &config->cfg_config_u.cfg_route.rtr_hop,
3615                                     &config->cfg_nid,
3616                                     &config->cfg_config_u.cfg_route.rtr_flags,
3617                                     &config->cfg_config_u.cfg_route.
3618                                         rtr_priority,
3619                                     &config->cfg_config_u.cfg_route.
3620                                         rtr_sensitivity);
3621                 mutex_unlock(&the_lnet.ln_api_mutex);
3622                 return rc;
3623
3624         case IOC_LIBCFS_GET_LOCAL_NI: {
3625                 struct lnet_ioctl_config_ni *cfg_ni;
3626                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3627                 struct lnet_ioctl_element_stats *stats;
3628                 __u32 tun_size;
3629
3630                 cfg_ni = arg;
3631
3632                 /* get the tunables if they are available */
3633                 if (cfg_ni->lic_cfg_hdr.ioc_len <
3634                     sizeof(*cfg_ni) + sizeof(*stats) + sizeof(*tun))
3635                         return -EINVAL;
3636
3637                 stats = (struct lnet_ioctl_element_stats *)
3638                         cfg_ni->lic_bulk;
3639                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3640                                 (cfg_ni->lic_bulk + sizeof(*stats));
3641
3642                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
3643                         sizeof(*stats);
3644
3645                 mutex_lock(&the_lnet.ln_api_mutex);
3646                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
3647                 mutex_unlock(&the_lnet.ln_api_mutex);
3648                 return rc;
3649         }
3650
3651         case IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS: {
3652                 struct lnet_ioctl_element_msg_stats *msg_stats = arg;
3653
3654                 if (msg_stats->im_hdr.ioc_len != sizeof(*msg_stats))
3655                         return -EINVAL;
3656
3657                 mutex_lock(&the_lnet.ln_api_mutex);
3658                 rc = lnet_get_ni_stats(msg_stats);
3659                 mutex_unlock(&the_lnet.ln_api_mutex);
3660
3661                 return rc;
3662         }
3663
3664         case IOC_LIBCFS_GET_NET: {
3665                 size_t total = sizeof(*config) +
3666                                sizeof(struct lnet_ioctl_net_config);
3667                 config = arg;
3668
3669                 if (config->cfg_hdr.ioc_len < total)
3670                         return -EINVAL;
3671
3672                 mutex_lock(&the_lnet.ln_api_mutex);
3673                 rc = lnet_get_net_config(config);
3674                 mutex_unlock(&the_lnet.ln_api_mutex);
3675                 return rc;
3676         }
3677
3678         case IOC_LIBCFS_GET_LNET_STATS:
3679         {
3680                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
3681
3682                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
3683                         return -EINVAL;
3684
3685                 mutex_lock(&the_lnet.ln_api_mutex);
3686                 lnet_counters_get(&lnet_stats->st_cntrs);
3687                 mutex_unlock(&the_lnet.ln_api_mutex);
3688                 return 0;
3689         }
3690
3691         case IOC_LIBCFS_CONFIG_RTR:
3692                 config = arg;
3693
3694                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3695                         return -EINVAL;
3696
3697                 mutex_lock(&the_lnet.ln_api_mutex);
3698                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
3699                         rc = lnet_rtrpools_enable();
3700                         mutex_unlock(&the_lnet.ln_api_mutex);
3701                         return rc;
3702                 }
3703                 lnet_rtrpools_disable();
3704                 mutex_unlock(&the_lnet.ln_api_mutex);
3705                 return 0;
3706
3707         case IOC_LIBCFS_ADD_BUF:
3708                 config = arg;
3709
3710                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3711                         return -EINVAL;
3712
3713                 mutex_lock(&the_lnet.ln_api_mutex);
3714                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
3715                                                 buf_tiny,
3716                                           config->cfg_config_u.cfg_buffers.
3717                                                 buf_small,
3718                                           config->cfg_config_u.cfg_buffers.
3719                                                 buf_large);
3720                 mutex_unlock(&the_lnet.ln_api_mutex);
3721                 return rc;
3722
3723         case IOC_LIBCFS_SET_NUMA_RANGE: {
3724                 struct lnet_ioctl_set_value *numa;
3725                 numa = arg;
3726                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3727                         return -EINVAL;
3728                 lnet_net_lock(LNET_LOCK_EX);
3729                 lnet_numa_range = numa->sv_value;
3730                 lnet_net_unlock(LNET_LOCK_EX);
3731                 return 0;
3732         }
3733
3734         case IOC_LIBCFS_GET_NUMA_RANGE: {
3735                 struct lnet_ioctl_set_value *numa;
3736                 numa = arg;
3737                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3738                         return -EINVAL;
3739                 numa->sv_value = lnet_numa_range;
3740                 return 0;
3741         }
3742
3743         case IOC_LIBCFS_GET_BUF: {
3744                 struct lnet_ioctl_pool_cfg *pool_cfg;
3745                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
3746
3747                 config = arg;
3748
3749                 if (config->cfg_hdr.ioc_len < total)
3750                         return -EINVAL;
3751
3752                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
3753
3754                 mutex_lock(&the_lnet.ln_api_mutex);
3755                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
3756                 mutex_unlock(&the_lnet.ln_api_mutex);
3757                 return rc;
3758         }
3759
3760         case IOC_LIBCFS_GET_LOCAL_HSTATS: {
3761                 struct lnet_ioctl_local_ni_hstats *stats = arg;
3762
3763                 if (stats->hlni_hdr.ioc_len < sizeof(*stats))
3764                         return -EINVAL;
3765
3766                 mutex_lock(&the_lnet.ln_api_mutex);
3767                 rc = lnet_get_local_ni_hstats(stats);
3768                 mutex_unlock(&the_lnet.ln_api_mutex);
3769
3770                 return rc;
3771         }
3772
3773         case IOC_LIBCFS_GET_RECOVERY_QUEUE: {
3774                 struct lnet_ioctl_recovery_list *list = arg;
3775                 if (list->rlst_hdr.ioc_len < sizeof(*list))
3776                         return -EINVAL;
3777
3778                 mutex_lock(&the_lnet.ln_api_mutex);
3779                 if (list->rlst_type == LNET_HEALTH_TYPE_LOCAL_NI)
3780                         rc = lnet_get_local_ni_recovery_list(list);
3781                 else
3782                         rc = lnet_get_peer_ni_recovery_list(list);
3783                 mutex_unlock(&the_lnet.ln_api_mutex);
3784                 return rc;
3785         }
3786
3787         case IOC_LIBCFS_ADD_PEER_NI: {
3788                 struct lnet_ioctl_peer_cfg *cfg = arg;
3789
3790                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3791                         return -EINVAL;
3792
3793                 mutex_lock(&the_lnet.ln_api_mutex);
3794                 rc = lnet_add_peer_ni(cfg->prcfg_prim_nid,
3795                                       cfg->prcfg_cfg_nid,
3796                                       cfg->prcfg_mr);
3797                 mutex_unlock(&the_lnet.ln_api_mutex);
3798                 return rc;
3799         }
3800
3801         case IOC_LIBCFS_DEL_PEER_NI: {
3802                 struct lnet_ioctl_peer_cfg *cfg = arg;
3803
3804                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3805                         return -EINVAL;
3806
3807                 mutex_lock(&the_lnet.ln_api_mutex);
3808                 rc = lnet_del_peer_ni(cfg->prcfg_prim_nid,
3809                                       cfg->prcfg_cfg_nid);
3810                 mutex_unlock(&the_lnet.ln_api_mutex);
3811                 return rc;
3812         }
3813
3814         case IOC_LIBCFS_GET_PEER_INFO: {
3815                 struct lnet_ioctl_peer *peer_info = arg;
3816
3817                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
3818                         return -EINVAL;
3819
3820                 mutex_lock(&the_lnet.ln_api_mutex);
3821                 rc = lnet_get_peer_ni_info(
3822                    peer_info->pr_count,
3823                    &peer_info->pr_nid,
3824                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
3825                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
3826                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
3827                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
3828                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
3829                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
3830                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
3831                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
3832                 mutex_unlock(&the_lnet.ln_api_mutex);
3833                 return rc;
3834         }
3835
3836         case IOC_LIBCFS_GET_PEER_NI: {
3837                 struct lnet_ioctl_peer_cfg *cfg = arg;
3838
3839                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3840                         return -EINVAL;
3841
3842                 mutex_lock(&the_lnet.ln_api_mutex);
3843                 rc = lnet_get_peer_info(cfg,
3844                                         (void __user *)cfg->prcfg_bulk);
3845                 mutex_unlock(&the_lnet.ln_api_mutex);
3846                 return rc;
3847         }
3848
3849         case IOC_LIBCFS_GET_PEER_LIST: {
3850                 struct lnet_ioctl_peer_cfg *cfg = arg;
3851
3852                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3853                         return -EINVAL;
3854
3855                 mutex_lock(&the_lnet.ln_api_mutex);
3856                 rc = lnet_get_peer_list(&cfg->prcfg_count, &cfg->prcfg_size,
3857                                 (struct lnet_process_id __user *)cfg->prcfg_bulk);
3858                 mutex_unlock(&the_lnet.ln_api_mutex);
3859                 return rc;
3860         }
3861
3862         case IOC_LIBCFS_SET_HEALHV: {
3863                 struct lnet_ioctl_reset_health_cfg *cfg = arg;
3864                 int value;
3865                 if (cfg->rh_hdr.ioc_len < sizeof(*cfg))
3866                         return -EINVAL;
3867                 if (cfg->rh_value < 0 ||
3868                     cfg->rh_value > LNET_MAX_HEALTH_VALUE)
3869                         value = LNET_MAX_HEALTH_VALUE;
3870                 else
3871                         value = cfg->rh_value;
3872                 CDEBUG(D_NET, "Manually setting healthv to %d for %s:%s. all = %d\n",
3873                        value, (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI) ?
3874                        "local" : "peer", libcfs_nid2str(cfg->rh_nid), cfg->rh_all);
3875                 mutex_lock(&the_lnet.ln_api_mutex);
3876                 if (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI)
3877                         lnet_ni_set_healthv(cfg->rh_nid, value,
3878                                              cfg->rh_all);
3879                 else
3880                         lnet_peer_ni_set_healthv(cfg->rh_nid, value,
3881                                                   cfg->rh_all);
3882                 mutex_unlock(&the_lnet.ln_api_mutex);
3883                 return 0;
3884         }
3885
3886         case IOC_LIBCFS_NOTIFY_ROUTER: {
3887                 time64_t deadline = ktime_get_real_seconds() - data->ioc_u64[0];
3888
3889                 /* The deadline passed in by the user should be some time in
3890                  * seconds in the future since the UNIX epoch. We have to map
3891                  * that deadline to the wall clock.
3892                  */
3893                 deadline += ktime_get_seconds();
3894                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags, false,
3895                                    deadline);
3896         }
3897
3898         case IOC_LIBCFS_LNET_DIST:
3899                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
3900                 if (rc < 0 && rc != -EHOSTUNREACH)
3901                         return rc;
3902
3903                 data->ioc_u32[0] = rc;
3904                 return 0;
3905
3906         case IOC_LIBCFS_TESTPROTOCOMPAT:
3907                 the_lnet.ln_testprotocompat = data->ioc_flags;
3908                 return 0;
3909
3910         case IOC_LIBCFS_LNET_FAULT:
3911                 return lnet_fault_ctl(data->ioc_flags, data);
3912
3913         case IOC_LIBCFS_PING: {
3914                 signed long timeout;
3915
3916                 id.nid = data->ioc_nid;
3917                 id.pid = data->ioc_u32[0];
3918
3919                 /* If timeout is negative then set default of 3 minutes */
3920                 if (((s32)data->ioc_u32[1] <= 0) ||
3921                     data->ioc_u32[1] > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3922                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3923                 else
3924                         timeout = nsecs_to_jiffies(data->ioc_u32[1] * NSEC_PER_MSEC);
3925
3926                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
3927                                data->ioc_plen1 / sizeof(struct lnet_process_id));
3928
3929                 if (rc < 0)
3930                         return rc;
3931
3932                 data->ioc_count = rc;
3933                 return 0;
3934         }
3935
3936         case IOC_LIBCFS_PING_PEER: {
3937                 struct lnet_ioctl_ping_data *ping = arg;
3938                 struct lnet_peer *lp;
3939                 signed long timeout;
3940
3941                 /* If timeout is negative then set default of 3 minutes */
3942                 if (((s32)ping->op_param) <= 0 ||
3943                     ping->op_param > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3944                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3945                 else
3946                         timeout = nsecs_to_jiffies(ping->op_param * NSEC_PER_MSEC);
3947
3948                 rc = lnet_ping(ping->ping_id, timeout,
3949                                ping->ping_buf,
3950                                ping->ping_count);
3951                 if (rc < 0)
3952                         return rc;
3953
3954                 mutex_lock(&the_lnet.ln_api_mutex);
3955                 lp = lnet_find_peer(ping->ping_id.nid);
3956                 if (lp) {
3957                         ping->ping_id.nid = lp->lp_primary_nid;
3958                         ping->mr_info = lnet_peer_is_multi_rail(lp);
3959                         lnet_peer_decref_locked(lp);
3960                 }
3961                 mutex_unlock(&the_lnet.ln_api_mutex);
3962
3963                 ping->ping_count = rc;
3964                 return 0;
3965         }
3966
3967         case IOC_LIBCFS_DISCOVER: {
3968                 struct lnet_ioctl_ping_data *discover = arg;
3969                 struct lnet_peer *lp;
3970
3971                 rc = lnet_discover(discover->ping_id, discover->op_param,
3972                                    discover->ping_buf,
3973                                    discover->ping_count);
3974                 if (rc < 0)
3975                         return rc;
3976
3977                 mutex_lock(&the_lnet.ln_api_mutex);
3978                 lp = lnet_find_peer(discover->ping_id.nid);
3979                 if (lp) {
3980                         discover->ping_id.nid = lp->lp_primary_nid;
3981                         discover->mr_info = lnet_peer_is_multi_rail(lp);
3982                         lnet_peer_decref_locked(lp);
3983                 }
3984                 mutex_unlock(&the_lnet.ln_api_mutex);
3985
3986                 discover->ping_count = rc;
3987                 return 0;
3988         }
3989
3990         default:
3991                 ni = lnet_net2ni_addref(data->ioc_net);
3992                 if (ni == NULL)
3993                         return -EINVAL;
3994
3995                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
3996                         rc = -EINVAL;
3997                 else
3998                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
3999
4000                 lnet_ni_decref(ni);
4001                 return rc;
4002         }
4003         /* not reached */
4004 }
4005 EXPORT_SYMBOL(LNetCtl);
4006
4007 void LNetDebugPeer(struct lnet_process_id id)
4008 {
4009         lnet_debug_peer(id.nid);
4010 }
4011 EXPORT_SYMBOL(LNetDebugPeer);
4012
4013 /**
4014  * Determine if the specified peer \a nid is on the local node.
4015  *
4016  * \param nid   peer nid to check
4017  *
4018  * \retval true         If peer NID is on the local node.
4019  * \retval false        If peer NID is not on the local node.
4020  */
4021 bool LNetIsPeerLocal(lnet_nid_t nid)
4022 {
4023         struct lnet_net *net;
4024         struct lnet_ni *ni;
4025         int cpt;
4026
4027         cpt = lnet_net_lock_current();
4028         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4029                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4030                         if (ni->ni_nid == nid) {
4031                                 lnet_net_unlock(cpt);
4032                                 return true;
4033                         }
4034                 }
4035         }
4036         lnet_net_unlock(cpt);
4037
4038         return false;
4039 }
4040 EXPORT_SYMBOL(LNetIsPeerLocal);
4041
4042 /**
4043  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
4044  * Note that all interfaces share a same PID, as requested by LNetNIInit().
4045  *
4046  * \param index Index of the interface to look up.
4047  * \param id On successful return, this location will hold the
4048  * struct lnet_process_id ID of the interface.
4049  *
4050  * \retval 0 If an interface exists at \a index.
4051  * \retval -ENOENT If no interface has been found.
4052  */
4053 int
4054 LNetGetId(unsigned int index, struct lnet_process_id *id)
4055 {
4056         struct lnet_ni   *ni;
4057         struct lnet_net  *net;
4058         int               cpt;
4059         int               rc = -ENOENT;
4060
4061         LASSERT(the_lnet.ln_refcount > 0);
4062
4063         cpt = lnet_net_lock_current();
4064
4065         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4066                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4067                         if (index-- != 0)
4068                                 continue;
4069
4070                         id->nid = ni->ni_nid;
4071                         id->pid = the_lnet.ln_pid;
4072                         rc = 0;
4073                         break;
4074                 }
4075         }
4076
4077         lnet_net_unlock(cpt);
4078         return rc;
4079 }
4080 EXPORT_SYMBOL(LNetGetId);
4081
4082 struct ping_data {
4083         int rc;
4084         int replied;
4085         struct lnet_handle_md mdh;
4086         struct completion completion;
4087 };
4088
4089 static void
4090 lnet_ping_event_handler(struct lnet_event *event)
4091 {
4092         struct ping_data *pd = event->md_user_ptr;
4093
4094         CDEBUG(D_NET, "ping event (%d %d)%s\n",
4095                event->type, event->status,
4096                event->unlinked ? " unlinked" : "");
4097
4098         if (event->status) {
4099                 if (!pd->rc)
4100                         pd->rc = event->status;
4101         } else if (event->type == LNET_EVENT_REPLY) {
4102                 pd->replied = 1;
4103                 pd->rc = event->mlength;
4104         }
4105         if (event->unlinked)
4106                 complete(&pd->completion);
4107 }
4108
4109 static int lnet_ping(struct lnet_process_id id, signed long timeout,
4110                      struct lnet_process_id __user *ids, int n_ids)
4111 {
4112         struct lnet_md md = { NULL };
4113         struct ping_data pd = { 0 };
4114         struct lnet_ping_buffer *pbuf;
4115         struct lnet_process_id tmpid;
4116         int i;
4117         int nob;
4118         int rc;
4119         int rc2;
4120
4121         /* n_ids limit is arbitrary */
4122         if (n_ids <= 0 || id.nid == LNET_NID_ANY)
4123                 return -EINVAL;
4124
4125         /*
4126          * if the user buffer has more space than the lnet_interfaces_max
4127          * then only fill it up to lnet_interfaces_max
4128          */
4129         if (n_ids > lnet_interfaces_max)
4130                 n_ids = lnet_interfaces_max;
4131
4132         if (id.pid == LNET_PID_ANY)
4133                 id.pid = LNET_PID_LUSTRE;
4134
4135         pbuf = lnet_ping_buffer_alloc(n_ids, GFP_NOFS);
4136         if (!pbuf)
4137                 return -ENOMEM;
4138
4139         /* initialize md content */
4140         md.start     = &pbuf->pb_info;
4141         md.length    = LNET_PING_INFO_SIZE(n_ids);
4142         md.threshold = 2; /* GET/REPLY */
4143         md.max_size  = 0;
4144         md.options   = LNET_MD_TRUNCATE;
4145         md.user_ptr  = &pd;
4146         md.handler   = lnet_ping_event_handler;
4147
4148         init_completion(&pd.completion);
4149
4150         rc = LNetMDBind(&md, LNET_UNLINK, &pd.mdh);
4151         if (rc != 0) {
4152                 CERROR("Can't bind MD: %d\n", rc);
4153                 goto fail_ping_buffer_decref;
4154         }
4155
4156         rc = LNetGet(LNET_NID_ANY, pd.mdh, id,
4157                      LNET_RESERVED_PORTAL,
4158                      LNET_PROTO_PING_MATCHBITS, 0, false);
4159
4160         if (rc != 0) {
4161                 /* Don't CERROR; this could be deliberate! */
4162                 rc2 = LNetMDUnlink(pd.mdh);
4163                 LASSERT(rc2 == 0);
4164
4165                 /* NB must wait for the UNLINK event below... */
4166         }
4167
4168         if (wait_for_completion_timeout(&pd.completion, timeout) == 0) {
4169                 /* Ensure completion in finite time... */
4170                 LNetMDUnlink(pd.mdh);
4171                 wait_for_completion(&pd.completion);
4172         }
4173         if (!pd.replied) {
4174                 rc = -EIO;
4175                 goto fail_ping_buffer_decref;
4176         }
4177
4178         nob = pd.rc;
4179         LASSERT(nob >= 0 && nob <= LNET_PING_INFO_SIZE(n_ids));
4180
4181         rc = -EPROTO;           /* if I can't parse... */
4182
4183         if (nob < 8) {
4184                 CERROR("%s: ping info too short %d\n",
4185                        libcfs_id2str(id), nob);
4186                 goto fail_ping_buffer_decref;
4187         }
4188
4189         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
4190                 lnet_swap_pinginfo(pbuf);
4191         } else if (pbuf->pb_info.pi_magic != LNET_PROTO_PING_MAGIC) {
4192                 CERROR("%s: Unexpected magic %08x\n",
4193                        libcfs_id2str(id), pbuf->pb_info.pi_magic);
4194                 goto fail_ping_buffer_decref;
4195         }
4196
4197         if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
4198                 CERROR("%s: ping w/o NI status: 0x%x\n",
4199                        libcfs_id2str(id), pbuf->pb_info.pi_features);
4200                 goto fail_ping_buffer_decref;
4201         }
4202
4203         if (nob < LNET_PING_INFO_SIZE(0)) {
4204                 CERROR("%s: Short reply %d(%d min)\n",
4205                        libcfs_id2str(id),
4206                        nob, (int)LNET_PING_INFO_SIZE(0));
4207                 goto fail_ping_buffer_decref;
4208         }
4209
4210         if (pbuf->pb_info.pi_nnis < n_ids)
4211                 n_ids = pbuf->pb_info.pi_nnis;
4212
4213         if (nob < LNET_PING_INFO_SIZE(n_ids)) {
4214                 CERROR("%s: Short reply %d(%d expected)\n",
4215                        libcfs_id2str(id),
4216                        nob, (int)LNET_PING_INFO_SIZE(n_ids));
4217                 goto fail_ping_buffer_decref;
4218         }
4219
4220         rc = -EFAULT;           /* if I segv in copy_to_user()... */
4221
4222         memset(&tmpid, 0, sizeof(tmpid));
4223         for (i = 0; i < n_ids; i++) {
4224                 tmpid.pid = pbuf->pb_info.pi_pid;
4225                 tmpid.nid = pbuf->pb_info.pi_ni[i].ns_nid;
4226                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
4227                         goto fail_ping_buffer_decref;
4228         }
4229         rc = pbuf->pb_info.pi_nnis;
4230
4231  fail_ping_buffer_decref:
4232         lnet_ping_buffer_decref(pbuf);
4233         return rc;
4234 }
4235
4236 static int
4237 lnet_discover(struct lnet_process_id id, __u32 force,
4238               struct lnet_process_id __user *ids, int n_ids)
4239 {
4240         struct lnet_peer_ni *lpni;
4241         struct lnet_peer_ni *p;
4242         struct lnet_peer *lp;
4243         struct lnet_process_id *buf;
4244         int cpt;
4245         int i;
4246         int rc;
4247
4248         if (n_ids <= 0 ||
4249             id.nid == LNET_NID_ANY)
4250                 return -EINVAL;
4251
4252         if (id.pid == LNET_PID_ANY)
4253                 id.pid = LNET_PID_LUSTRE;
4254
4255         /*
4256          * If the user buffer has more space than the lnet_interfaces_max,
4257          * then only fill it up to lnet_interfaces_max.
4258          */
4259         if (n_ids > lnet_interfaces_max)
4260                 n_ids = lnet_interfaces_max;
4261
4262         CFS_ALLOC_PTR_ARRAY(buf, n_ids);
4263         if (!buf)
4264                 return -ENOMEM;
4265
4266         cpt = lnet_net_lock_current();
4267         lpni = lnet_nid2peerni_locked(id.nid, LNET_NID_ANY, cpt);
4268         if (IS_ERR(lpni)) {
4269                 rc = PTR_ERR(lpni);
4270                 goto out;
4271         }
4272
4273         /*
4274          * Clearing the NIDS_UPTODATE flag ensures the peer will
4275          * be discovered, provided discovery has not been disabled.
4276          */
4277         lp = lpni->lpni_peer_net->lpn_peer;
4278         spin_lock(&lp->lp_lock);
4279         lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
4280         /* If the force flag is set, force a PING and PUSH as well. */
4281         if (force)
4282                 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
4283         spin_unlock(&lp->lp_lock);
4284         rc = lnet_discover_peer_locked(lpni, cpt, true);
4285         if (rc)
4286                 goto out_decref;
4287
4288         i = 0;
4289         p = NULL;
4290         while ((p = lnet_get_next_peer_ni_locked(lp, NULL, p)) != NULL) {
4291                 buf[i].pid = id.pid;
4292                 buf[i].nid = p->lpni_nid;
4293                 if (++i >= n_ids)
4294                         break;
4295         }
4296         rc = i;
4297
4298 out_decref:
4299         lnet_peer_ni_decref_locked(lpni);
4300 out:
4301         lnet_net_unlock(cpt);
4302
4303         if (rc >= 0)
4304                 if (copy_to_user(ids, buf, rc * sizeof(*buf)))
4305                         rc = -EFAULT;
4306         CFS_FREE_PTR_ARRAY(buf, n_ids);
4307
4308         return rc;
4309 }
4310
4311 /**
4312  * Retrieve peer discovery status.
4313  *
4314  * \retval 1 if lnet_peer_discovery_disabled is 0
4315  * \retval 0 if lnet_peer_discovery_disabled is 1
4316  */
4317 int
4318 LNetGetPeerDiscoveryStatus(void)
4319 {
4320         return !lnet_peer_discovery_disabled;
4321 }
4322 EXPORT_SYMBOL(LNetGetPeerDiscoveryStatus);