lnet/lnet/api-ni.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LNET
  34
  35 #include <linux/ctype.h>
  36 #include <linux/log2.h>
  37 #include <linux/ktime.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/uaccess.h>
  40 #ifdef HAVE_SCHED_HEADERS
  41 #include <linux/sched/signal.h>
  42 #endif
  43
  44 #include <lnet/lib-lnet.h>
  45
  46 #define D_LNI D_CONSOLE
  47
  48 /*
  49  * initialize ln_api_mutex statically, since it needs to be used in
  50  * discovery_set callback. That module parameter callback can be called
  51  * before module init completes. The mutex needs to be ready for use then.
  52  */
  53 struct lnet the_lnet = {
  54         .ln_api_mutex = __MUTEX_INITIALIZER(the_lnet.ln_api_mutex),
  55 };              /* THE state of the network */
  56 EXPORT_SYMBOL(the_lnet);
  57
  58 static char *ip2nets = "";
  59 module_param(ip2nets, charp, 0444);
  60 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  61
  62 static char *networks = "";
  63 module_param(networks, charp, 0444);
  64 MODULE_PARM_DESC(networks, "local networks");
  65
  66 static char *routes = "";
  67 module_param(routes, charp, 0444);
  68 MODULE_PARM_DESC(routes, "routes to non-local networks");
  69
  70 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  71 module_param(rnet_htable_size, int, 0444);
  72 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
  73
  74 static int use_tcp_bonding = false;
  75 module_param(use_tcp_bonding, int, 0444);
  76 MODULE_PARM_DESC(use_tcp_bonding,
  77                  "Set to 1 to use socklnd bonding. 0 to use Multi-Rail");
  78
  79 unsigned int lnet_numa_range = 0;
  80 module_param(lnet_numa_range, uint, 0444);
  81 MODULE_PARM_DESC(lnet_numa_range,
  82                 "NUMA range to consider during Multi-Rail selection");
  83
  84 /*
  85  * lnet_health_sensitivity determines by how much we decrement the health
  86  * value on sending error. The value defaults to 100, which means health
  87  * interface health is decremented by 100 points every failure.
  88  */
  89 unsigned int lnet_health_sensitivity = 100;
  90 static int sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
  91 #ifdef HAVE_KERNEL_PARAM_OPS
  92 static struct kernel_param_ops param_ops_health_sensitivity = {
  93         .set = sensitivity_set,
  94         .get = param_get_int,
  95 };
  96 #define param_check_health_sensitivity(name, p) \
  97                 __param_check(name, p, int)
  98 module_param(lnet_health_sensitivity, health_sensitivity, S_IRUGO|S_IWUSR);
  99 #else
 100 module_param_call(lnet_health_sensitivity, sensitivity_set, param_get_int,
 101                   &lnet_health_sensitivity, S_IRUGO|S_IWUSR);
 102 #endif
 103 MODULE_PARM_DESC(lnet_health_sensitivity,
 104                 "Value to decrement the health value by on error");
 105
 106 /*
 107  * lnet_recovery_interval determines how often we should perform recovery
 108  * on unhealthy interfaces.
 109  */
 110 unsigned int lnet_recovery_interval = 1;
 111 static int recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp);
 112 #ifdef HAVE_KERNEL_PARAM_OPS
 113 static struct kernel_param_ops param_ops_recovery_interval = {
 114         .set = recovery_interval_set,
 115         .get = param_get_int,
 116 };
 117 #define param_check_recovery_interval(name, p) \
 118                 __param_check(name, p, int)
 119 module_param(lnet_recovery_interval, recovery_interval, S_IRUGO|S_IWUSR);
 120 #else
 121 module_param_call(lnet_recovery_interval, recovery_interval_set, param_get_int,
 122                   &lnet_recovery_interval, S_IRUGO|S_IWUSR);
 123 #endif
 124 MODULE_PARM_DESC(lnet_recovery_interval,
 125                 "Interval to recover unhealthy interfaces in seconds");
 126
 127 static int lnet_interfaces_max = LNET_INTERFACES_MAX_DEFAULT;
 128 static int intf_max_set(const char *val, cfs_kernel_param_arg_t *kp);
 129
 130 static struct kernel_param_ops param_ops_interfaces_max = {
 131         .set = intf_max_set,
 132         .get = param_get_int,
 133 };
 134
 135 #define param_check_interfaces_max(name, p) \
 136                 __param_check(name, p, int)
 137
 138 #ifdef HAVE_KERNEL_PARAM_OPS
 139 module_param(lnet_interfaces_max, interfaces_max, 0644);
 140 #else
 141 module_param_call(lnet_interfaces_max, intf_max_set, param_get_int,
 142                   &param_ops_interfaces_max, 0644);
 143 #endif
 144 MODULE_PARM_DESC(lnet_interfaces_max,
 145                 "Maximum number of interfaces in a node.");
 146
 147 unsigned lnet_peer_discovery_disabled = 0;
 148 static int discovery_set(const char *val, cfs_kernel_param_arg_t *kp);
 149
 150 static struct kernel_param_ops param_ops_discovery_disabled = {
 151         .set = discovery_set,
 152         .get = param_get_int,
 153 };
 154
 155 #define param_check_discovery_disabled(name, p) \
 156                 __param_check(name, p, int)
 157 #ifdef HAVE_KERNEL_PARAM_OPS
 158 module_param(lnet_peer_discovery_disabled, discovery_disabled, 0644);
 159 #else
 160 module_param_call(lnet_peer_discovery_disabled, discovery_set, param_get_int,
 161                   &param_ops_discovery_disabled, 0644);
 162 #endif
 163 MODULE_PARM_DESC(lnet_peer_discovery_disabled,
 164                 "Set to 1 to disable peer discovery on this node.");
 165
 166 unsigned int lnet_drop_asym_route;
 167 static int drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp);
 168
 169 static struct kernel_param_ops param_ops_drop_asym_route = {
 170         .set = drop_asym_route_set,
 171         .get = param_get_int,
 172 };
 173
 174 #define param_check_drop_asym_route(name, p)    \
 175         __param_check(name, p, int)
 176 #ifdef HAVE_KERNEL_PARAM_OPS
 177 module_param(lnet_drop_asym_route, drop_asym_route, 0644);
 178 #else
 179 module_param_call(lnet_drop_asym_route, drop_asym_route_set, param_get_int,
 180                   &param_ops_drop_asym_route, 0644);
 181 #endif
 182 MODULE_PARM_DESC(lnet_drop_asym_route,
 183                  "Set to 1 to drop asymmetrical route messages.");
 184
 185 #define LNET_TRANSACTION_TIMEOUT_NO_HEALTH_DEFAULT 50
 186 #define LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT 50
 187
 188 unsigned lnet_transaction_timeout = LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT;
 189 static int transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp);
 190 #ifdef HAVE_KERNEL_PARAM_OPS
 191 static struct kernel_param_ops param_ops_transaction_timeout = {
 192         .set = transaction_to_set,
 193         .get = param_get_int,
 194 };
 195
 196 #define param_check_transaction_timeout(name, p) \
 197                 __param_check(name, p, int)
 198 module_param(lnet_transaction_timeout, transaction_timeout, S_IRUGO|S_IWUSR);
 199 #else
 200 module_param_call(lnet_transaction_timeout, transaction_to_set, param_get_int,
 201                   &lnet_transaction_timeout, S_IRUGO|S_IWUSR);
 202 #endif
 203 MODULE_PARM_DESC(lnet_transaction_timeout,
 204                 "Maximum number of seconds to wait for a peer response.");
 205
 206 #define LNET_RETRY_COUNT_HEALTH_DEFAULT 2
 207 unsigned lnet_retry_count = LNET_RETRY_COUNT_HEALTH_DEFAULT;
 208 static int retry_count_set(const char *val, cfs_kernel_param_arg_t *kp);
 209 #ifdef HAVE_KERNEL_PARAM_OPS
 210 static struct kernel_param_ops param_ops_retry_count = {
 211         .set = retry_count_set,
 212         .get = param_get_int,
 213 };
 214
 215 #define param_check_retry_count(name, p) \
 216                 __param_check(name, p, int)
 217 module_param(lnet_retry_count, retry_count, S_IRUGO|S_IWUSR);
 218 #else
 219 module_param_call(lnet_retry_count, retry_count_set, param_get_int,
 220                   &lnet_retry_count, S_IRUGO|S_IWUSR);
 221 #endif
 222 MODULE_PARM_DESC(lnet_retry_count,
 223                  "Maximum number of times to retry transmitting a message");
 224
 225
 226 unsigned lnet_lnd_timeout = LNET_LND_DEFAULT_TIMEOUT;
 227 unsigned int lnet_current_net_count;
 228
 229 /*
 230  * This sequence number keeps track of how many times DLC was used to
 231  * update the local NIs. It is incremented when a NI is added or
 232  * removed and checked when sending a message to determine if there is
 233  * a need to re-run the selection algorithm. See lnet_select_pathway()
 234  * for more details on its usage.
 235  */
 236 static atomic_t lnet_dlc_seq_no = ATOMIC_INIT(0);
 237
 238 static int lnet_ping(struct lnet_process_id id, signed long timeout,
 239                      struct lnet_process_id __user *ids, int n_ids);
 240
 241 static int lnet_discover(struct lnet_process_id id, __u32 force,
 242                          struct lnet_process_id __user *ids, int n_ids);
 243
 244 static int
 245 sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
 246 {
 247         int rc;
 248         unsigned *sensitivity = (unsigned *)kp->arg;
 249         unsigned long value;
 250
 251         rc = kstrtoul(val, 0, &value);
 252         if (rc) {
 253                 CERROR("Invalid module parameter value for 'lnet_health_sensitivity'\n");
 254                 return rc;
 255         }
 256
 257         /*
 258          * The purpose of locking the api_mutex here is to ensure that
 259          * the correct value ends up stored properly.
 260          */
 261         mutex_lock(&the_lnet.ln_api_mutex);
 262
 263         if (value > LNET_MAX_HEALTH_VALUE) {
 264                 mutex_unlock(&the_lnet.ln_api_mutex);
 265                 CERROR("Invalid health value. Maximum: %d value = %lu\n",
 266                        LNET_MAX_HEALTH_VALUE, value);
 267                 return -EINVAL;
 268         }
 269
 270         /*
 271          * if we're turning on health then use the health timeout
 272          * defaults.
 273          */
 274         if (*sensitivity == 0 && value != 0) {
 275                 lnet_transaction_timeout = LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT;
 276                 lnet_retry_count = LNET_RETRY_COUNT_HEALTH_DEFAULT;
 277         /*
 278          * if we're turning off health then use the no health timeout
 279          * default.
 280          */
 281         } else if (*sensitivity != 0 && value == 0) {
 282                 lnet_transaction_timeout =
 283                         LNET_TRANSACTION_TIMEOUT_NO_HEALTH_DEFAULT;
 284                 lnet_retry_count = 0;
 285         }
 286
 287         *sensitivity = value;
 288
 289         mutex_unlock(&the_lnet.ln_api_mutex);
 290
 291         return 0;
 292 }
 293
 294 static int
 295 recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp)
 296 {
 297         int rc;
 298         unsigned *interval = (unsigned *)kp->arg;
 299         unsigned long value;
 300
 301         rc = kstrtoul(val, 0, &value);
 302         if (rc) {
 303                 CERROR("Invalid module parameter value for 'lnet_recovery_interval'\n");
 304                 return rc;
 305         }
 306
 307         if (value < 1) {
 308                 CERROR("lnet_recovery_interval must be at least 1 second\n");
 309                 return -EINVAL;
 310         }
 311
 312         /*
 313          * The purpose of locking the api_mutex here is to ensure that
 314          * the correct value ends up stored properly.
 315          */
 316         mutex_lock(&the_lnet.ln_api_mutex);
 317
 318         *interval = value;
 319
 320         mutex_unlock(&the_lnet.ln_api_mutex);
 321
 322         return 0;
 323 }
 324
 325 static int
 326 discovery_set(const char *val, cfs_kernel_param_arg_t *kp)
 327 {
 328         int rc;
 329         unsigned *discovery = (unsigned *)kp->arg;
 330         unsigned long value;
 331         struct lnet_ping_buffer *pbuf;
 332
 333         rc = kstrtoul(val, 0, &value);
 334         if (rc) {
 335                 CERROR("Invalid module parameter value for 'lnet_peer_discovery_disabled'\n");
 336                 return rc;
 337         }
 338
 339         value = (value) ? 1 : 0;
 340
 341         /*
 342          * The purpose of locking the api_mutex here is to ensure that
 343          * the correct value ends up stored properly.
 344          */
 345         mutex_lock(&the_lnet.ln_api_mutex);
 346
 347         if (value == *discovery) {
 348                 mutex_unlock(&the_lnet.ln_api_mutex);
 349                 return 0;
 350         }
 351
 352         *discovery = value;
 353
 354         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
 355                 mutex_unlock(&the_lnet.ln_api_mutex);
 356                 return 0;
 357         }
 358
 359         /* tell peers that discovery setting has changed */
 360         lnet_net_lock(LNET_LOCK_EX);
 361         pbuf = the_lnet.ln_ping_target;
 362         if (value)
 363                 pbuf->pb_info.pi_features &= ~LNET_PING_FEAT_DISCOVERY;
 364         else
 365                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
 366         lnet_net_unlock(LNET_LOCK_EX);
 367
 368         lnet_push_update_to_peers(1);
 369
 370         mutex_unlock(&the_lnet.ln_api_mutex);
 371
 372         return 0;
 373 }
 374
 375 static int
 376 drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp)
 377 {
 378         int rc;
 379         unsigned int *drop_asym_route = (unsigned int *)kp->arg;
 380         unsigned long value;
 381
 382         rc = kstrtoul(val, 0, &value);
 383         if (rc) {
 384                 CERROR("Invalid module parameter value for "
 385                        "'lnet_drop_asym_route'\n");
 386                 return rc;
 387         }
 388
 389         /*
 390          * The purpose of locking the api_mutex here is to ensure that
 391          * the correct value ends up stored properly.
 392          */
 393         mutex_lock(&the_lnet.ln_api_mutex);
 394
 395         if (value == *drop_asym_route) {
 396                 mutex_unlock(&the_lnet.ln_api_mutex);
 397                 return 0;
 398         }
 399
 400         *drop_asym_route = value;
 401
 402         mutex_unlock(&the_lnet.ln_api_mutex);
 403
 404         return 0;
 405 }
 406
 407 static int
 408 transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp)
 409 {
 410         int rc;
 411         unsigned *transaction_to = (unsigned *)kp->arg;
 412         unsigned long value;
 413
 414         rc = kstrtoul(val, 0, &value);
 415         if (rc) {
 416                 CERROR("Invalid module parameter value for 'lnet_transaction_timeout'\n");
 417                 return rc;
 418         }
 419
 420         /*
 421          * The purpose of locking the api_mutex here is to ensure that
 422          * the correct value ends up stored properly.
 423          */
 424         mutex_lock(&the_lnet.ln_api_mutex);
 425
 426         if (value < lnet_retry_count || value == 0) {
 427                 mutex_unlock(&the_lnet.ln_api_mutex);
 428                 CERROR("Invalid value for lnet_transaction_timeout (%lu). "
 429                        "Has to be greater than lnet_retry_count (%u)\n",
 430                        value, lnet_retry_count);
 431                 return -EINVAL;
 432         }
 433
 434         if (value == *transaction_to) {
 435                 mutex_unlock(&the_lnet.ln_api_mutex);
 436                 return 0;
 437         }
 438
 439         *transaction_to = value;
 440         if (lnet_retry_count == 0)
 441                 lnet_lnd_timeout = value;
 442         else
 443                 lnet_lnd_timeout = value / lnet_retry_count;
 444
 445         mutex_unlock(&the_lnet.ln_api_mutex);
 446
 447         return 0;
 448 }
 449
 450 static int
 451 retry_count_set(const char *val, cfs_kernel_param_arg_t *kp)
 452 {
 453         int rc;
 454         unsigned *retry_count = (unsigned *)kp->arg;
 455         unsigned long value;
 456
 457         rc = kstrtoul(val, 0, &value);
 458         if (rc) {
 459                 CERROR("Invalid module parameter value for 'lnet_retry_count'\n");
 460                 return rc;
 461         }
 462
 463         /*
 464          * The purpose of locking the api_mutex here is to ensure that
 465          * the correct value ends up stored properly.
 466          */
 467         mutex_lock(&the_lnet.ln_api_mutex);
 468
 469         if (lnet_health_sensitivity == 0) {
 470                 mutex_unlock(&the_lnet.ln_api_mutex);
 471                 CERROR("Can not set retry_count when health feature is turned off\n");
 472                 return -EINVAL;
 473         }
 474
 475         if (value > lnet_transaction_timeout) {
 476                 mutex_unlock(&the_lnet.ln_api_mutex);
 477                 CERROR("Invalid value for lnet_retry_count (%lu). "
 478                        "Has to be smaller than lnet_transaction_timeout (%u)\n",
 479                        value, lnet_transaction_timeout);
 480                 return -EINVAL;
 481         }
 482
 483         *retry_count = value;
 484
 485         if (value == 0)
 486                 lnet_lnd_timeout = lnet_transaction_timeout;
 487         else
 488                 lnet_lnd_timeout = lnet_transaction_timeout / value;
 489
 490         mutex_unlock(&the_lnet.ln_api_mutex);
 491
 492         return 0;
 493 }
 494
 495 static int
 496 intf_max_set(const char *val, cfs_kernel_param_arg_t *kp)
 497 {
 498         int value, rc;
 499
 500         rc = kstrtoint(val, 0, &value);
 501         if (rc) {
 502                 CERROR("Invalid module parameter value for 'lnet_interfaces_max'\n");
 503                 return rc;
 504         }
 505
 506         if (value < LNET_INTERFACES_MIN) {
 507                 CWARN("max interfaces provided are too small, setting to %d\n",
 508                       LNET_INTERFACES_MAX_DEFAULT);
 509                 value = LNET_INTERFACES_MAX_DEFAULT;
 510         }
 511
 512         *(int *)kp->arg = value;
 513
 514         return 0;
 515 }
 516
 517 static char *
 518 lnet_get_routes(void)
 519 {
 520         return routes;
 521 }
 522
 523 static char *
 524 lnet_get_networks(void)
 525 {
 526         char   *nets;
 527         int     rc;
 528
 529         if (*networks != 0 && *ip2nets != 0) {
 530                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
 531                                    "'ip2nets' but not both at once\n");
 532                 return NULL;
 533         }
 534
 535         if (*ip2nets != 0) {
 536                 rc = lnet_parse_ip2nets(&nets, ip2nets);
 537                 return (rc == 0) ? nets : NULL;
 538         }
 539
 540         if (*networks != 0)
 541                 return networks;
 542
 543         return "tcp";
 544 }
 545
 546 static void
 547 lnet_init_locks(void)
 548 {
 549         spin_lock_init(&the_lnet.ln_eq_wait_lock);
 550         spin_lock_init(&the_lnet.ln_msg_resend_lock);
 551         init_completion(&the_lnet.ln_mt_wait_complete);
 552         mutex_init(&the_lnet.ln_lnd_mutex);
 553 }
 554
 555 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 556 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 557                                             *  MDs kmem_cache */
 558 struct kmem_cache *lnet_rspt_cachep;       /* response tracker cache */
 559 struct kmem_cache *lnet_msg_cachep;
 560
 561 static int
 562 lnet_slab_setup(void)
 563 {
 564         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 565          * allocated in <size-xxx> kmem_cache).
 566          */
 567         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(struct lnet_me),
 568                                             0, 0, NULL);
 569         if (!lnet_mes_cachep)
 570                 return -ENOMEM;
 571
 572         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 573                                                   LNET_SMALL_MD_SIZE, 0, 0,
 574                                                   NULL);
 575         if (!lnet_small_mds_cachep)
 576                 return -ENOMEM;
 577
 578         lnet_rspt_cachep = kmem_cache_create("lnet_rspt", sizeof(struct lnet_rsp_tracker),
 579                                             0, 0, NULL);
 580         if (!lnet_rspt_cachep)
 581                 return -ENOMEM;
 582
 583         lnet_msg_cachep = kmem_cache_create("lnet_msg", sizeof(struct lnet_msg),
 584                                             0, 0, NULL);
 585         if (!lnet_msg_cachep)
 586                 return -ENOMEM;
 587
 588         return 0;
 589 }
 590
 591 static void
 592 lnet_slab_cleanup(void)
 593 {
 594         if (lnet_msg_cachep) {
 595                 kmem_cache_destroy(lnet_msg_cachep);
 596                 lnet_msg_cachep = NULL;
 597         }
 598
 599
 600         if (lnet_rspt_cachep) {
 601                 kmem_cache_destroy(lnet_rspt_cachep);
 602                 lnet_rspt_cachep = NULL;
 603         }
 604
 605         if (lnet_small_mds_cachep) {
 606                 kmem_cache_destroy(lnet_small_mds_cachep);
 607                 lnet_small_mds_cachep = NULL;
 608         }
 609
 610         if (lnet_mes_cachep) {
 611                 kmem_cache_destroy(lnet_mes_cachep);
 612                 lnet_mes_cachep = NULL;
 613         }
 614 }
 615
 616 static int
 617 lnet_create_remote_nets_table(void)
 618 {
 619         int               i;
 620         struct list_head *hash;
 621
 622         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 623         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 624         CFS_ALLOC_PTR_ARRAY(hash, LNET_REMOTE_NETS_HASH_SIZE);
 625         if (hash == NULL) {
 626                 CERROR("Failed to create remote nets hash table\n");
 627                 return -ENOMEM;
 628         }
 629
 630         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 631                 INIT_LIST_HEAD(&hash[i]);
 632         the_lnet.ln_remote_nets_hash = hash;
 633         return 0;
 634 }
 635
 636 static void
 637 lnet_destroy_remote_nets_table(void)
 638 {
 639         int i;
 640
 641         if (the_lnet.ln_remote_nets_hash == NULL)
 642                 return;
 643
 644         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 645                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 646
 647         CFS_FREE_PTR_ARRAY(the_lnet.ln_remote_nets_hash,
 648                            LNET_REMOTE_NETS_HASH_SIZE);
 649         the_lnet.ln_remote_nets_hash = NULL;
 650 }
 651
 652 static void
 653 lnet_destroy_locks(void)
 654 {
 655         if (the_lnet.ln_res_lock != NULL) {
 656                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 657                 the_lnet.ln_res_lock = NULL;
 658         }
 659
 660         if (the_lnet.ln_net_lock != NULL) {
 661                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 662                 the_lnet.ln_net_lock = NULL;
 663         }
 664 }
 665
 666 static int
 667 lnet_create_locks(void)
 668 {
 669         lnet_init_locks();
 670
 671         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 672         if (the_lnet.ln_res_lock == NULL)
 673                 goto failed;
 674
 675         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 676         if (the_lnet.ln_net_lock == NULL)
 677                 goto failed;
 678
 679         return 0;
 680
 681  failed:
 682         lnet_destroy_locks();
 683         return -ENOMEM;
 684 }
 685
 686 static void lnet_assert_wire_constants(void)
 687 {
 688         /* Wire protocol assertions generated by 'wirecheck'
 689          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 690          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 691          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 692
 693         /* Constants... */
 694         BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
 695         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
 696         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
 697         BUILD_BUG_ON(LNET_MSG_ACK != 0);
 698         BUILD_BUG_ON(LNET_MSG_PUT != 1);
 699         BUILD_BUG_ON(LNET_MSG_GET != 2);
 700         BUILD_BUG_ON(LNET_MSG_REPLY != 3);
 701         BUILD_BUG_ON(LNET_MSG_HELLO != 4);
 702
 703         /* Checks for struct lnet_handle_wire */
 704         BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
 705         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 706                                    wh_interface_cookie) != 0);
 707         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
 708         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 709                                    wh_object_cookie) != 8);
 710         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
 711
 712         /* Checks for struct struct lnet_magicversion */
 713         BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
 714         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
 715         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
 716         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
 717         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
 718         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion,
 719                                    version_minor) != 6);
 720         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
 721
 722         /* Checks for struct struct lnet_hdr */
 723         BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
 724         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
 725         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
 726         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
 727         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
 728         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
 729         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
 730         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
 731         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
 732         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
 733         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
 734         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
 735         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
 736         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
 737         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
 738
 739         /* Ack */
 740         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
 741         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
 742         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
 743         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
 744         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
 745         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
 746
 747         /* Put */
 748         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
 749         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
 750         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
 751         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
 752         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
 753         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
 754         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
 755         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
 756         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
 757         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
 758
 759         /* Get */
 760         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
 761         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
 762         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
 763         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
 764         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
 765         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
 766         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
 767         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
 768         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
 769         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
 770
 771         /* Reply */
 772         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
 773         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
 774
 775         /* Hello */
 776         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
 777         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
 778         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
 779         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
 780
 781         /* Checks for struct lnet_ni_status and related constants */
 782         BUILD_BUG_ON(LNET_NI_STATUS_INVALID != 0x00000000);
 783         BUILD_BUG_ON(LNET_NI_STATUS_UP != 0x15aac0de);
 784         BUILD_BUG_ON(LNET_NI_STATUS_DOWN != 0xdeadface);
 785
 786         /* Checks for struct lnet_ni_status */
 787         BUILD_BUG_ON((int)sizeof(struct lnet_ni_status) != 16);
 788         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_nid) != 0);
 789         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_nid) != 8);
 790         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_status) != 8);
 791         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_status) != 4);
 792         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_unused) != 12);
 793         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_unused) != 4);
 794
 795         /* Checks for struct lnet_ping_info and related constants */
 796         BUILD_BUG_ON(LNET_PROTO_PING_MAGIC != 0x70696E67);
 797         BUILD_BUG_ON(LNET_PING_FEAT_INVAL != 0);
 798         BUILD_BUG_ON(LNET_PING_FEAT_BASE != 1);
 799         BUILD_BUG_ON(LNET_PING_FEAT_NI_STATUS != 2);
 800         BUILD_BUG_ON(LNET_PING_FEAT_RTE_DISABLED != 4);
 801         BUILD_BUG_ON(LNET_PING_FEAT_MULTI_RAIL != 8);
 802         BUILD_BUG_ON(LNET_PING_FEAT_DISCOVERY != 16);
 803         BUILD_BUG_ON(LNET_PING_FEAT_BITS != 31);
 804
 805         /* Checks for struct lnet_ping_info */
 806         BUILD_BUG_ON((int)sizeof(struct lnet_ping_info) != 16);
 807         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_magic) != 0);
 808         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_magic) != 4);
 809         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_features) != 4);
 810         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_features) != 4);
 811         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_pid) != 8);
 812         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_pid) != 4);
 813         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_nnis) != 12);
 814         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_nnis) != 4);
 815         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_ni) != 16);
 816         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_ni) != 0);
 817 }
 818
 819 static const struct lnet_lnd *lnet_find_lnd_by_type(__u32 type)
 820 {
 821         const struct lnet_lnd *lnd;
 822
 823         /* holding lnd mutex */
 824         if (type >= NUM_LNDS)
 825                 return NULL;
 826         lnd = the_lnet.ln_lnds[type];
 827         LASSERT(!lnd || lnd->lnd_type == type);
 828
 829         return lnd;
 830 }
 831
 832 unsigned int
 833 lnet_get_lnd_timeout(void)
 834 {
 835         return lnet_lnd_timeout;
 836 }
 837 EXPORT_SYMBOL(lnet_get_lnd_timeout);
 838
 839 void
 840 lnet_register_lnd(const struct lnet_lnd *lnd)
 841 {
 842         mutex_lock(&the_lnet.ln_lnd_mutex);
 843
 844         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 845         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 846
 847         the_lnet.ln_lnds[lnd->lnd_type] = lnd;
 848
 849         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 850
 851         mutex_unlock(&the_lnet.ln_lnd_mutex);
 852 }
 853 EXPORT_SYMBOL(lnet_register_lnd);
 854
 855 void
 856 lnet_unregister_lnd(const struct lnet_lnd *lnd)
 857 {
 858         mutex_lock(&the_lnet.ln_lnd_mutex);
 859
 860         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 861
 862         the_lnet.ln_lnds[lnd->lnd_type] = NULL;
 863         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 864
 865         mutex_unlock(&the_lnet.ln_lnd_mutex);
 866 }
 867 EXPORT_SYMBOL(lnet_unregister_lnd);
 868
 869 void
 870 lnet_counters_get_common(struct lnet_counters_common *common)
 871 {
 872         struct lnet_counters *ctr;
 873         int i;
 874
 875         memset(common, 0, sizeof(*common));
 876
 877         lnet_net_lock(LNET_LOCK_EX);
 878
 879         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 880                 common->lcc_msgs_max     += ctr->lct_common.lcc_msgs_max;
 881                 common->lcc_msgs_alloc   += ctr->lct_common.lcc_msgs_alloc;
 882                 common->lcc_errors       += ctr->lct_common.lcc_errors;
 883                 common->lcc_send_count   += ctr->lct_common.lcc_send_count;
 884                 common->lcc_recv_count   += ctr->lct_common.lcc_recv_count;
 885                 common->lcc_route_count  += ctr->lct_common.lcc_route_count;
 886                 common->lcc_drop_count   += ctr->lct_common.lcc_drop_count;
 887                 common->lcc_send_length  += ctr->lct_common.lcc_send_length;
 888                 common->lcc_recv_length  += ctr->lct_common.lcc_recv_length;
 889                 common->lcc_route_length += ctr->lct_common.lcc_route_length;
 890                 common->lcc_drop_length  += ctr->lct_common.lcc_drop_length;
 891         }
 892         lnet_net_unlock(LNET_LOCK_EX);
 893 }
 894 EXPORT_SYMBOL(lnet_counters_get_common);
 895
 896 void
 897 lnet_counters_get(struct lnet_counters *counters)
 898 {
 899         struct lnet_counters *ctr;
 900         struct lnet_counters_health *health = &counters->lct_health;
 901         int             i;
 902
 903         memset(counters, 0, sizeof(*counters));
 904
 905         lnet_counters_get_common(&counters->lct_common);
 906
 907         lnet_net_lock(LNET_LOCK_EX);
 908
 909         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 910                 health->lch_rst_alloc    += ctr->lct_health.lch_rst_alloc;
 911                 health->lch_resend_count += ctr->lct_health.lch_resend_count;
 912                 health->lch_response_timeout_count +=
 913                                 ctr->lct_health.lch_response_timeout_count;
 914                 health->lch_local_interrupt_count +=
 915                                 ctr->lct_health.lch_local_interrupt_count;
 916                 health->lch_local_dropped_count +=
 917                                 ctr->lct_health.lch_local_dropped_count;
 918                 health->lch_local_aborted_count +=
 919                                 ctr->lct_health.lch_local_aborted_count;
 920                 health->lch_local_no_route_count +=
 921                                 ctr->lct_health.lch_local_no_route_count;
 922                 health->lch_local_timeout_count +=
 923                                 ctr->lct_health.lch_local_timeout_count;
 924                 health->lch_local_error_count +=
 925                                 ctr->lct_health.lch_local_error_count;
 926                 health->lch_remote_dropped_count +=
 927                                 ctr->lct_health.lch_remote_dropped_count;
 928                 health->lch_remote_error_count +=
 929                                 ctr->lct_health.lch_remote_error_count;
 930                 health->lch_remote_timeout_count +=
 931                                 ctr->lct_health.lch_remote_timeout_count;
 932                 health->lch_network_timeout_count +=
 933                                 ctr->lct_health.lch_network_timeout_count;
 934         }
 935         lnet_net_unlock(LNET_LOCK_EX);
 936 }
 937 EXPORT_SYMBOL(lnet_counters_get);
 938
 939 void
 940 lnet_counters_reset(void)
 941 {
 942         struct lnet_counters *counters;
 943         int             i;
 944
 945         lnet_net_lock(LNET_LOCK_EX);
 946
 947         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 948                 memset(counters, 0, sizeof(struct lnet_counters));
 949
 950         lnet_net_unlock(LNET_LOCK_EX);
 951 }
 952
 953 static char *
 954 lnet_res_type2str(int type)
 955 {
 956         switch (type) {
 957         default:
 958                 LBUG();
 959         case LNET_COOKIE_TYPE_MD:
 960                 return "MD";
 961         case LNET_COOKIE_TYPE_ME:
 962                 return "ME";
 963         case LNET_COOKIE_TYPE_EQ:
 964                 return "EQ";
 965         }
 966 }
 967
 968 static void
 969 lnet_res_container_cleanup(struct lnet_res_container *rec)
 970 {
 971         int     count = 0;
 972
 973         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 974                 return;
 975
 976         while (!list_empty(&rec->rec_active)) {
 977                 struct list_head *e = rec->rec_active.next;
 978
 979                 list_del_init(e);
 980                 if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 981                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
 982
 983                 } else { /* NB: Active MEs should be attached on portals */
 984                         LBUG();
 985                 }
 986                 count++;
 987         }
 988
 989         if (count > 0) {
 990                 /* Found alive MD/ME/EQ, user really should unlink/free
 991                  * all of them before finalize LNet, but if someone didn't,
 992                  * we have to recycle garbage for him */
 993                 CERROR("%d active elements on exit of %s container\n",
 994                        count, lnet_res_type2str(rec->rec_type));
 995         }
 996
 997         if (rec->rec_lh_hash != NULL) {
 998                 CFS_FREE_PTR_ARRAY(rec->rec_lh_hash, LNET_LH_HASH_SIZE);
 999                 rec->rec_lh_hash = NULL;
1000         }
1001
1002         rec->rec_type = 0; /* mark it as finalized */
1003 }
1004
1005 static int
1006 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
1007 {
1008         int     rc = 0;
1009         int     i;
1010
1011         LASSERT(rec->rec_type == 0);
1012
1013         rec->rec_type = type;
1014         INIT_LIST_HEAD(&rec->rec_active);
1015
1016         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
1017
1018         /* Arbitrary choice of hash table size */
1019         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
1020                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
1021         if (rec->rec_lh_hash == NULL) {
1022                 rc = -ENOMEM;
1023                 goto out;
1024         }
1025
1026         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
1027                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
1028
1029         return 0;
1030
1031 out:
1032         CERROR("Failed to setup %s resource container\n",
1033                lnet_res_type2str(type));
1034         lnet_res_container_cleanup(rec);
1035         return rc;
1036 }
1037
1038 static void
1039 lnet_res_containers_destroy(struct lnet_res_container **recs)
1040 {
1041         struct lnet_res_container       *rec;
1042         int                             i;
1043
1044         cfs_percpt_for_each(rec, i, recs)
1045                 lnet_res_container_cleanup(rec);
1046
1047         cfs_percpt_free(recs);
1048 }
1049
1050 static struct lnet_res_container **
1051 lnet_res_containers_create(int type)
1052 {
1053         struct lnet_res_container       **recs;
1054         struct lnet_res_container       *rec;
1055         int                             rc;
1056         int                             i;
1057
1058         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
1059         if (recs == NULL) {
1060                 CERROR("Failed to allocate %s resource containers\n",
1061                        lnet_res_type2str(type));
1062                 return NULL;
1063         }
1064
1065         cfs_percpt_for_each(rec, i, recs) {
1066                 rc = lnet_res_container_setup(rec, i, type);
1067                 if (rc != 0) {
1068                         lnet_res_containers_destroy(recs);
1069                         return NULL;
1070                 }
1071         }
1072
1073         return recs;
1074 }
1075
1076 struct lnet_libhandle *
1077 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
1078 {
1079         /* ALWAYS called with lnet_res_lock held */
1080         struct list_head        *head;
1081         struct lnet_libhandle   *lh;
1082         unsigned int            hash;
1083
1084         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
1085                 return NULL;
1086
1087         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
1088         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
1089
1090         list_for_each_entry(lh, head, lh_hash_chain) {
1091                 if (lh->lh_cookie == cookie)
1092                         return lh;
1093         }
1094
1095         return NULL;
1096 }
1097
1098 void
1099 lnet_res_lh_initialize(struct lnet_res_container *rec,
1100                        struct lnet_libhandle *lh)
1101 {
1102         /* ALWAYS called with lnet_res_lock held */
1103         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
1104         unsigned int    hash;
1105
1106         lh->lh_cookie = rec->rec_lh_cookie;
1107         rec->rec_lh_cookie += 1 << ibits;
1108
1109         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
1110
1111         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
1112 }
1113
1114 struct list_head **
1115 lnet_create_array_of_queues(void)
1116 {
1117         struct list_head **qs;
1118         struct list_head *q;
1119         int i;
1120
1121         qs = cfs_percpt_alloc(lnet_cpt_table(),
1122                               sizeof(struct list_head));
1123         if (!qs) {
1124                 CERROR("Failed to allocate queues\n");
1125                 return NULL;
1126         }
1127
1128         cfs_percpt_for_each(q, i, qs)
1129                 INIT_LIST_HEAD(q);
1130
1131         return qs;
1132 }
1133
1134 static int lnet_unprepare(void);
1135
1136 static int
1137 lnet_prepare(lnet_pid_t requested_pid)
1138 {
1139         /* Prepare to bring up the network */
1140         struct lnet_res_container **recs;
1141         int                       rc = 0;
1142
1143         if (requested_pid == LNET_PID_ANY) {
1144                 /* Don't instantiate LNET just for me */
1145                 return -ENETDOWN;
1146         }
1147
1148         LASSERT(the_lnet.ln_refcount == 0);
1149
1150         the_lnet.ln_routing = 0;
1151
1152         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
1153         the_lnet.ln_pid = requested_pid;
1154
1155         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
1156         INIT_LIST_HEAD(&the_lnet.ln_remote_peer_ni_list);
1157         INIT_LIST_HEAD(&the_lnet.ln_nets);
1158         INIT_LIST_HEAD(&the_lnet.ln_routers);
1159         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
1160         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
1161         INIT_LIST_HEAD(&the_lnet.ln_dc_request);
1162         INIT_LIST_HEAD(&the_lnet.ln_dc_working);
1163         INIT_LIST_HEAD(&the_lnet.ln_dc_expired);
1164         INIT_LIST_HEAD(&the_lnet.ln_mt_localNIRecovq);
1165         INIT_LIST_HEAD(&the_lnet.ln_mt_peerNIRecovq);
1166         init_waitqueue_head(&the_lnet.ln_dc_waitq);
1167         the_lnet.ln_mt_eq = NULL;
1168         init_completion(&the_lnet.ln_started);
1169
1170         rc = lnet_slab_setup();
1171         if (rc != 0)
1172                 goto failed;
1173
1174         rc = lnet_create_remote_nets_table();
1175         if (rc != 0)
1176                 goto failed;
1177
1178         /*
1179          * NB the interface cookie in wire handles guards against delayed
1180          * replies and ACKs appearing valid after reboot.
1181          */
1182         the_lnet.ln_interface_cookie = ktime_get_real_ns();
1183
1184         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
1185                                                 sizeof(struct lnet_counters));
1186         if (the_lnet.ln_counters == NULL) {
1187                 CERROR("Failed to allocate counters for LNet\n");
1188                 rc = -ENOMEM;
1189                 goto failed;
1190         }
1191
1192         rc = lnet_peer_tables_create();
1193         if (rc != 0)
1194                 goto failed;
1195
1196         rc = lnet_msg_containers_create();
1197         if (rc != 0)
1198                 goto failed;
1199
1200         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
1201                                       LNET_COOKIE_TYPE_EQ);
1202         if (rc != 0)
1203                 goto failed;
1204
1205         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
1206         if (recs == NULL) {
1207                 rc = -ENOMEM;
1208                 goto failed;
1209         }
1210
1211         the_lnet.ln_md_containers = recs;
1212
1213         rc = lnet_portals_create();
1214         if (rc != 0) {
1215                 CERROR("Failed to create portals for LNet: %d\n", rc);
1216                 goto failed;
1217         }
1218
1219         the_lnet.ln_mt_zombie_rstqs = lnet_create_array_of_queues();
1220         if (!the_lnet.ln_mt_zombie_rstqs) {
1221                 rc = -ENOMEM;
1222                 goto failed;
1223         }
1224
1225         return 0;
1226
1227  failed:
1228         lnet_unprepare();
1229         return rc;
1230 }
1231
1232 static int
1233 lnet_unprepare (void)
1234 {
1235         int rc;
1236
1237         /* NB no LNET_LOCK since this is the last reference.  All LND instances
1238          * have shut down already, so it is safe to unlink and free all
1239          * descriptors, even those that appear committed to a network op (eg MD
1240          * with non-zero pending count) */
1241
1242         lnet_fail_nid(LNET_NID_ANY, 0);
1243
1244         LASSERT(the_lnet.ln_refcount == 0);
1245         LASSERT(list_empty(&the_lnet.ln_test_peers));
1246         LASSERT(list_empty(&the_lnet.ln_nets));
1247
1248         if (the_lnet.ln_mt_zombie_rstqs) {
1249                 lnet_clean_zombie_rstqs();
1250                 the_lnet.ln_mt_zombie_rstqs = NULL;
1251         }
1252
1253         if (the_lnet.ln_mt_eq) {
1254                 rc = LNetEQFree(the_lnet.ln_mt_eq);
1255                 the_lnet.ln_mt_eq = NULL;
1256                 LASSERT(rc == 0);
1257         }
1258
1259         lnet_portals_destroy();
1260
1261         if (the_lnet.ln_md_containers != NULL) {
1262                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
1263                 the_lnet.ln_md_containers = NULL;
1264         }
1265
1266         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
1267
1268         lnet_msg_containers_destroy();
1269         lnet_peer_uninit();
1270         lnet_rtrpools_free(0);
1271
1272         if (the_lnet.ln_counters != NULL) {
1273                 cfs_percpt_free(the_lnet.ln_counters);
1274                 the_lnet.ln_counters = NULL;
1275         }
1276         lnet_destroy_remote_nets_table();
1277         lnet_slab_cleanup();
1278
1279         return 0;
1280 }
1281
1282 struct lnet_ni  *
1283 lnet_net2ni_locked(__u32 net_id, int cpt)
1284 {
1285         struct lnet_ni   *ni;
1286         struct lnet_net  *net;
1287
1288         LASSERT(cpt != LNET_LOCK_EX);
1289
1290         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1291                 if (net->net_id == net_id) {
1292                         ni = list_entry(net->net_ni_list.next, struct lnet_ni,
1293                                         ni_netlist);
1294                         return ni;
1295                 }
1296         }
1297
1298         return NULL;
1299 }
1300
1301 struct lnet_ni *
1302 lnet_net2ni_addref(__u32 net)
1303 {
1304         struct lnet_ni *ni;
1305
1306         lnet_net_lock(0);
1307         ni = lnet_net2ni_locked(net, 0);
1308         if (ni)
1309                 lnet_ni_addref_locked(ni, 0);
1310         lnet_net_unlock(0);
1311
1312         return ni;
1313 }
1314 EXPORT_SYMBOL(lnet_net2ni_addref);
1315
1316 struct lnet_net *
1317 lnet_get_net_locked(__u32 net_id)
1318 {
1319         struct lnet_net  *net;
1320
1321         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1322                 if (net->net_id == net_id)
1323                         return net;
1324         }
1325
1326         return NULL;
1327 }
1328
1329 unsigned int
1330 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
1331 {
1332         __u64           key = nid;
1333         unsigned int    val;
1334
1335         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
1336
1337         if (number == 1)
1338                 return 0;
1339
1340         val = hash_long(key, LNET_CPT_BITS);
1341         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
1342         if (val < number)
1343                 return val;
1344
1345         return (unsigned int)(key + val + (val >> 1)) % number;
1346 }
1347
1348 int
1349 lnet_cpt_of_nid_locked(lnet_nid_t nid, struct lnet_ni *ni)
1350 {
1351         struct lnet_net *net;
1352
1353         /* must called with hold of lnet_net_lock */
1354         if (LNET_CPT_NUMBER == 1)
1355                 return 0; /* the only one */
1356
1357         /*
1358          * If NI is provided then use the CPT identified in the NI cpt
1359          * list if one exists. If one doesn't exist, then that NI is
1360          * associated with all CPTs and it follows that the net it belongs
1361          * to is implicitly associated with all CPTs, so just hash the nid
1362          * and return that.
1363          */
1364         if (ni != NULL) {
1365                 if (ni->ni_cpts != NULL)
1366                         return ni->ni_cpts[lnet_nid_cpt_hash(nid,
1367                                                              ni->ni_ncpts)];
1368                 else
1369                         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1370         }
1371
1372         /* no NI provided so look at the net */
1373         net = lnet_get_net_locked(LNET_NIDNET(nid));
1374
1375         if (net != NULL && net->net_cpts != NULL) {
1376                 return net->net_cpts[lnet_nid_cpt_hash(nid, net->net_ncpts)];
1377         }
1378
1379         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1380 }
1381
1382 int
1383 lnet_cpt_of_nid(lnet_nid_t nid, struct lnet_ni *ni)
1384 {
1385         int     cpt;
1386         int     cpt2;
1387
1388         if (LNET_CPT_NUMBER == 1)
1389                 return 0; /* the only one */
1390
1391         cpt = lnet_net_lock_current();
1392
1393         cpt2 = lnet_cpt_of_nid_locked(nid, ni);
1394
1395         lnet_net_unlock(cpt);
1396
1397         return cpt2;
1398 }
1399 EXPORT_SYMBOL(lnet_cpt_of_nid);
1400
1401 int
1402 lnet_islocalnet_locked(__u32 net_id)
1403 {
1404         struct lnet_net *net;
1405         bool local;
1406
1407         net = lnet_get_net_locked(net_id);
1408
1409         local = net != NULL;
1410
1411         return local;
1412 }
1413
1414 int
1415 lnet_islocalnet(__u32 net_id)
1416 {
1417         int cpt;
1418         bool local;
1419
1420         cpt = lnet_net_lock_current();
1421
1422         local = lnet_islocalnet_locked(net_id);
1423
1424         lnet_net_unlock(cpt);
1425
1426         return local;
1427 }
1428
1429 struct lnet_ni  *
1430 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
1431 {
1432         struct lnet_net  *net;
1433         struct lnet_ni   *ni;
1434
1435         LASSERT(cpt != LNET_LOCK_EX);
1436
1437         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1438                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1439                         if (ni->ni_nid == nid)
1440                                 return ni;
1441                 }
1442         }
1443
1444         return NULL;
1445 }
1446
1447 struct lnet_ni *
1448 lnet_nid2ni_addref(lnet_nid_t nid)
1449 {
1450         struct lnet_ni *ni;
1451
1452         lnet_net_lock(0);
1453         ni = lnet_nid2ni_locked(nid, 0);
1454         if (ni)
1455                 lnet_ni_addref_locked(ni, 0);
1456         lnet_net_unlock(0);
1457
1458         return ni;
1459 }
1460 EXPORT_SYMBOL(lnet_nid2ni_addref);
1461
1462 int
1463 lnet_islocalnid(lnet_nid_t nid)
1464 {
1465         struct lnet_ni  *ni;
1466         int             cpt;
1467
1468         cpt = lnet_net_lock_current();
1469         ni = lnet_nid2ni_locked(nid, cpt);
1470         lnet_net_unlock(cpt);
1471
1472         return ni != NULL;
1473 }
1474
1475 int
1476 lnet_count_acceptor_nets(void)
1477 {
1478         /* Return the # of NIs that need the acceptor. */
1479         int              count = 0;
1480         struct lnet_net  *net;
1481         int              cpt;
1482
1483         cpt = lnet_net_lock_current();
1484         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1485                 /* all socklnd type networks should have the acceptor
1486                  * thread started */
1487                 if (net->net_lnd->lnd_accept != NULL)
1488                         count++;
1489         }
1490
1491         lnet_net_unlock(cpt);
1492
1493         return count;
1494 }
1495
1496 struct lnet_ping_buffer *
1497 lnet_ping_buffer_alloc(int nnis, gfp_t gfp)
1498 {
1499         struct lnet_ping_buffer *pbuf;
1500
1501         LIBCFS_ALLOC_GFP(pbuf, LNET_PING_BUFFER_SIZE(nnis), gfp);
1502         if (pbuf) {
1503                 pbuf->pb_nnis = nnis;
1504                 atomic_set(&pbuf->pb_refcnt, 1);
1505         }
1506
1507         return pbuf;
1508 }
1509
1510 void
1511 lnet_ping_buffer_free(struct lnet_ping_buffer *pbuf)
1512 {
1513         LASSERT(atomic_read(&pbuf->pb_refcnt) == 0);
1514         LIBCFS_FREE(pbuf, LNET_PING_BUFFER_SIZE(pbuf->pb_nnis));
1515 }
1516
1517 static struct lnet_ping_buffer *
1518 lnet_ping_target_create(int nnis)
1519 {
1520         struct lnet_ping_buffer *pbuf;
1521
1522         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1523         if (pbuf == NULL) {
1524                 CERROR("Can't allocate ping source [%d]\n", nnis);
1525                 return NULL;
1526         }
1527
1528         pbuf->pb_info.pi_nnis = nnis;
1529         pbuf->pb_info.pi_pid = the_lnet.ln_pid;
1530         pbuf->pb_info.pi_magic = LNET_PROTO_PING_MAGIC;
1531         pbuf->pb_info.pi_features =
1532                 LNET_PING_FEAT_NI_STATUS | LNET_PING_FEAT_MULTI_RAIL;
1533
1534         return pbuf;
1535 }
1536
1537 static inline int
1538 lnet_get_net_ni_count_locked(struct lnet_net *net)
1539 {
1540         struct lnet_ni  *ni;
1541         int             count = 0;
1542
1543         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1544                 count++;
1545
1546         return count;
1547 }
1548
1549 static inline int
1550 lnet_get_net_ni_count_pre(struct lnet_net *net)
1551 {
1552         struct lnet_ni  *ni;
1553         int             count = 0;
1554
1555         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
1556                 count++;
1557
1558         return count;
1559 }
1560
1561 static inline int
1562 lnet_get_ni_count(void)
1563 {
1564         struct lnet_ni  *ni;
1565         struct lnet_net *net;
1566         int             count = 0;
1567
1568         lnet_net_lock(0);
1569
1570         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1571                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1572                         count++;
1573         }
1574
1575         lnet_net_unlock(0);
1576
1577         return count;
1578 }
1579
1580 int
1581 lnet_get_net_count(void)
1582 {
1583         struct lnet_net *net;
1584         int count = 0;
1585
1586         lnet_net_lock(0);
1587
1588         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1589                 count++;
1590         }
1591
1592         lnet_net_unlock(0);
1593
1594         return count;
1595 }
1596
1597 void
1598 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
1599 {
1600         struct lnet_ni_status *stat;
1601         int nnis;
1602         int i;
1603
1604         __swab32s(&pbuf->pb_info.pi_magic);
1605         __swab32s(&pbuf->pb_info.pi_features);
1606         __swab32s(&pbuf->pb_info.pi_pid);
1607         __swab32s(&pbuf->pb_info.pi_nnis);
1608         nnis = pbuf->pb_info.pi_nnis;
1609         if (nnis > pbuf->pb_nnis)
1610                 nnis = pbuf->pb_nnis;
1611         for (i = 0; i < nnis; i++) {
1612                 stat = &pbuf->pb_info.pi_ni[i];
1613                 __swab64s(&stat->ns_nid);
1614                 __swab32s(&stat->ns_status);
1615         }
1616 }
1617
1618 int
1619 lnet_ping_info_validate(struct lnet_ping_info *pinfo)
1620 {
1621         if (!pinfo)
1622                 return -EINVAL;
1623         if (pinfo->pi_magic != LNET_PROTO_PING_MAGIC)
1624                 return -EPROTO;
1625         if (!(pinfo->pi_features & LNET_PING_FEAT_NI_STATUS))
1626                 return -EPROTO;
1627         /* Loopback is guaranteed to be present */
1628         if (pinfo->pi_nnis < 1 || pinfo->pi_nnis > lnet_interfaces_max)
1629                 return -ERANGE;
1630         if (LNET_NETTYP(LNET_NIDNET(LNET_PING_INFO_LONI(pinfo))) != LOLND)
1631                 return -EPROTO;
1632         return 0;
1633 }
1634
1635 static void
1636 lnet_ping_target_destroy(void)
1637 {
1638         struct lnet_net *net;
1639         struct lnet_ni  *ni;
1640
1641         lnet_net_lock(LNET_LOCK_EX);
1642
1643         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1644                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1645                         lnet_ni_lock(ni);
1646                         ni->ni_status = NULL;
1647                         lnet_ni_unlock(ni);
1648                 }
1649         }
1650
1651         lnet_ping_buffer_decref(the_lnet.ln_ping_target);
1652         the_lnet.ln_ping_target = NULL;
1653
1654         lnet_net_unlock(LNET_LOCK_EX);
1655 }
1656
1657 static void
1658 lnet_ping_target_event_handler(struct lnet_event *event)
1659 {
1660         struct lnet_ping_buffer *pbuf = event->md.user_ptr;
1661
1662         if (event->unlinked)
1663                 lnet_ping_buffer_decref(pbuf);
1664 }
1665
1666 static int
1667 lnet_ping_target_setup(struct lnet_ping_buffer **ppbuf,
1668                        struct lnet_handle_md *ping_mdh,
1669                        int ni_count, bool set_eq)
1670 {
1671         struct lnet_process_id id = {
1672                 .nid = LNET_NID_ANY,
1673                 .pid = LNET_PID_ANY
1674         };
1675         struct lnet_me *me;
1676         struct lnet_md md = { NULL };
1677         int rc, rc2;
1678
1679         if (set_eq) {
1680                 the_lnet.ln_ping_target_eq =
1681                         LNetEQAlloc(lnet_ping_target_event_handler);
1682                 if (IS_ERR(the_lnet.ln_ping_target_eq)) {
1683                         rc = PTR_ERR(the_lnet.ln_ping_target_eq);
1684                         CERROR("Can't allocate ping buffer EQ: %d\n", rc);
1685                         return rc;
1686                 }
1687         }
1688
1689         *ppbuf = lnet_ping_target_create(ni_count);
1690         if (*ppbuf == NULL) {
1691                 rc = -ENOMEM;
1692                 goto fail_free_eq;
1693         }
1694
1695         /* Ping target ME/MD */
1696         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1697                           LNET_PROTO_PING_MATCHBITS, 0,
1698                           LNET_UNLINK, LNET_INS_AFTER);
1699         if (IS_ERR(me)) {
1700                 rc = PTR_ERR(me);
1701                 CERROR("Can't create ping target ME: %d\n", rc);
1702                 goto fail_decref_ping_buffer;
1703         }
1704
1705         /* initialize md content */
1706         md.start     = &(*ppbuf)->pb_info;
1707         md.length    = LNET_PING_INFO_SIZE((*ppbuf)->pb_nnis);
1708         md.threshold = LNET_MD_THRESH_INF;
1709         md.max_size  = 0;
1710         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1711                        LNET_MD_MANAGE_REMOTE;
1712         md.eq_handle = the_lnet.ln_ping_target_eq;
1713         md.user_ptr  = *ppbuf;
1714
1715         rc = LNetMDAttach(me, md, LNET_RETAIN, ping_mdh);
1716         if (rc != 0) {
1717                 CERROR("Can't attach ping target MD: %d\n", rc);
1718                 goto fail_unlink_ping_me;
1719         }
1720         lnet_ping_buffer_addref(*ppbuf);
1721
1722         return 0;
1723
1724 fail_unlink_ping_me:
1725         LNetMEUnlink(me);
1726 fail_decref_ping_buffer:
1727         LASSERT(atomic_read(&(*ppbuf)->pb_refcnt) == 1);
1728         lnet_ping_buffer_decref(*ppbuf);
1729         *ppbuf = NULL;
1730 fail_free_eq:
1731         if (set_eq) {
1732                 rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1733                 LASSERT(rc2 == 0);
1734         }
1735         return rc;
1736 }
1737
1738 static void
1739 lnet_ping_md_unlink(struct lnet_ping_buffer *pbuf,
1740                     struct lnet_handle_md *ping_mdh)
1741 {
1742         LNetMDUnlink(*ping_mdh);
1743         LNetInvalidateMDHandle(ping_mdh);
1744
1745         /* NB the MD could be busy; this just starts the unlink */
1746         while (atomic_read(&pbuf->pb_refcnt) > 1) {
1747                 CDEBUG(D_NET, "Still waiting for ping data MD to unlink\n");
1748                 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1749         }
1750 }
1751
1752 static void
1753 lnet_ping_target_install_locked(struct lnet_ping_buffer *pbuf)
1754 {
1755         struct lnet_ni          *ni;
1756         struct lnet_net         *net;
1757         struct lnet_ni_status *ns;
1758         int                     i;
1759         int                     rc;
1760
1761         i = 0;
1762         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1763                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1764                         LASSERT(i < pbuf->pb_nnis);
1765
1766                         ns = &pbuf->pb_info.pi_ni[i];
1767
1768                         ns->ns_nid = ni->ni_nid;
1769
1770                         lnet_ni_lock(ni);
1771                         ns->ns_status = (ni->ni_status != NULL) ?
1772                                          ni->ni_status->ns_status :
1773                                                 LNET_NI_STATUS_UP;
1774                         ni->ni_status = ns;
1775                         lnet_ni_unlock(ni);
1776
1777                         i++;
1778                 }
1779         }
1780         /*
1781          * We (ab)use the ns_status of the loopback interface to
1782          * transmit the sequence number. The first interface listed
1783          * must be the loopback interface.
1784          */
1785         rc = lnet_ping_info_validate(&pbuf->pb_info);
1786         if (rc) {
1787                 LCONSOLE_EMERG("Invalid ping target: %d\n", rc);
1788                 LBUG();
1789         }
1790         LNET_PING_BUFFER_SEQNO(pbuf) =
1791                 atomic_inc_return(&the_lnet.ln_ping_target_seqno);
1792 }
1793
1794 static void
1795 lnet_ping_target_update(struct lnet_ping_buffer *pbuf,
1796                         struct lnet_handle_md ping_mdh)
1797 {
1798         struct lnet_ping_buffer *old_pbuf = NULL;
1799         struct lnet_handle_md old_ping_md;
1800
1801         /* switch the NIs to point to the new ping info created */
1802         lnet_net_lock(LNET_LOCK_EX);
1803
1804         if (!the_lnet.ln_routing)
1805                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1806         if (!lnet_peer_discovery_disabled)
1807                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
1808
1809         /* Ensure only known feature bits have been set. */
1810         LASSERT(pbuf->pb_info.pi_features & LNET_PING_FEAT_BITS);
1811         LASSERT(!(pbuf->pb_info.pi_features & ~LNET_PING_FEAT_BITS));
1812
1813         lnet_ping_target_install_locked(pbuf);
1814
1815         if (the_lnet.ln_ping_target) {
1816                 old_pbuf = the_lnet.ln_ping_target;
1817                 old_ping_md = the_lnet.ln_ping_target_md;
1818         }
1819         the_lnet.ln_ping_target_md = ping_mdh;
1820         the_lnet.ln_ping_target = pbuf;
1821
1822         lnet_net_unlock(LNET_LOCK_EX);
1823
1824         if (old_pbuf) {
1825                 /* unlink and free the old ping info */
1826                 lnet_ping_md_unlink(old_pbuf, &old_ping_md);
1827                 lnet_ping_buffer_decref(old_pbuf);
1828         }
1829
1830         lnet_push_update_to_peers(0);
1831 }
1832
1833 static void
1834 lnet_ping_target_fini(void)
1835 {
1836         int             rc;
1837
1838         lnet_ping_md_unlink(the_lnet.ln_ping_target,
1839                             &the_lnet.ln_ping_target_md);
1840
1841         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1842         LASSERT(rc == 0);
1843
1844         lnet_ping_target_destroy();
1845 }
1846
1847 /* Resize the push target. */
1848 int lnet_push_target_resize(void)
1849 {
1850         struct lnet_process_id id = { LNET_NID_ANY, LNET_PID_ANY };
1851         struct lnet_md md = { NULL };
1852         struct lnet_me *me;
1853         struct lnet_handle_md mdh;
1854         struct lnet_handle_md old_mdh;
1855         struct lnet_ping_buffer *pbuf;
1856         struct lnet_ping_buffer *old_pbuf;
1857         int nnis;
1858         int rc;
1859
1860 again:
1861         nnis = the_lnet.ln_push_target_nnis;
1862         if (nnis <= 0) {
1863                 rc = -EINVAL;
1864                 goto fail_return;
1865         }
1866
1867         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1868         if (!pbuf) {
1869                 rc = -ENOMEM;
1870                 goto fail_return;
1871         }
1872
1873         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1874                           LNET_PROTO_PING_MATCHBITS, 0,
1875                           LNET_UNLINK, LNET_INS_AFTER);
1876
1877         if (IS_ERR(me)) {
1878                 rc = PTR_ERR(me);
1879                 CERROR("Can't create push target ME: %d\n", rc);
1880                 goto fail_decref_pbuf;
1881         }
1882
1883         /* initialize md content */
1884         md.start     = &pbuf->pb_info;
1885         md.length    = LNET_PING_INFO_SIZE(nnis);
1886         md.threshold = LNET_MD_THRESH_INF;
1887         md.max_size  = 0;
1888         md.options   = LNET_MD_OP_PUT | LNET_MD_TRUNCATE |
1889                        LNET_MD_MANAGE_REMOTE;
1890         md.user_ptr  = pbuf;
1891         md.eq_handle = the_lnet.ln_push_target_eq;
1892
1893         rc = LNetMDAttach(me, md, LNET_RETAIN, &mdh);
1894         if (rc) {
1895                 CERROR("Can't attach push MD: %d\n", rc);
1896                 goto fail_unlink_me;
1897         }
1898         lnet_ping_buffer_addref(pbuf);
1899
1900         lnet_net_lock(LNET_LOCK_EX);
1901         old_pbuf = the_lnet.ln_push_target;
1902         old_mdh = the_lnet.ln_push_target_md;
1903         the_lnet.ln_push_target = pbuf;
1904         the_lnet.ln_push_target_md = mdh;
1905         lnet_net_unlock(LNET_LOCK_EX);
1906
1907         if (old_pbuf) {
1908                 LNetMDUnlink(old_mdh);
1909                 lnet_ping_buffer_decref(old_pbuf);
1910         }
1911
1912         if (nnis < the_lnet.ln_push_target_nnis)
1913                 goto again;
1914
1915         CDEBUG(D_NET, "nnis %d success\n", nnis);
1916
1917         return 0;
1918
1919 fail_unlink_me:
1920         LNetMEUnlink(me);
1921 fail_decref_pbuf:
1922         lnet_ping_buffer_decref(pbuf);
1923 fail_return:
1924         CDEBUG(D_NET, "nnis %d error %d\n", nnis, rc);
1925         return rc;
1926 }
1927
1928 static void lnet_push_target_event_handler(struct lnet_event *ev)
1929 {
1930         struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1931
1932         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
1933                 lnet_swap_pinginfo(pbuf);
1934
1935         lnet_peer_push_event(ev);
1936         if (ev->unlinked)
1937                 lnet_ping_buffer_decref(pbuf);
1938 }
1939
1940 /* Initialize the push target. */
1941 static int lnet_push_target_init(void)
1942 {
1943         int rc;
1944
1945         if (the_lnet.ln_push_target)
1946                 return -EALREADY;
1947
1948         the_lnet.ln_push_target_eq =
1949                 LNetEQAlloc(lnet_push_target_event_handler);
1950         if (IS_ERR(the_lnet.ln_push_target_eq)) {
1951                 rc = PTR_ERR(the_lnet.ln_push_target_eq);
1952                 CERROR("Can't allocated push target EQ: %d\n", rc);
1953                 return rc;
1954         }
1955
1956         /* Start at the required minimum, we'll enlarge if required. */
1957         the_lnet.ln_push_target_nnis = LNET_INTERFACES_MIN;
1958
1959         rc = lnet_push_target_resize();
1960
1961         if (rc) {
1962                 LNetEQFree(the_lnet.ln_push_target_eq);
1963                 the_lnet.ln_push_target_eq = NULL;
1964         }
1965
1966         return rc;
1967 }
1968
1969 /* Clean up the push target. */
1970 static void lnet_push_target_fini(void)
1971 {
1972         if (!the_lnet.ln_push_target)
1973                 return;
1974
1975         /* Unlink and invalidate to prevent new references. */
1976         LNetMDUnlink(the_lnet.ln_push_target_md);
1977         LNetInvalidateMDHandle(&the_lnet.ln_push_target_md);
1978
1979         /* Wait for the unlink to complete. */
1980         while (atomic_read(&the_lnet.ln_push_target->pb_refcnt) > 1) {
1981                 CDEBUG(D_NET, "Still waiting for ping data MD to unlink\n");
1982                 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1983         }
1984
1985         lnet_ping_buffer_decref(the_lnet.ln_push_target);
1986         the_lnet.ln_push_target = NULL;
1987         the_lnet.ln_push_target_nnis = 0;
1988
1989         LNetEQFree(the_lnet.ln_push_target_eq);
1990         the_lnet.ln_push_target_eq = NULL;
1991 }
1992
1993 static int
1994 lnet_ni_tq_credits(struct lnet_ni *ni)
1995 {
1996         int     credits;
1997
1998         LASSERT(ni->ni_ncpts >= 1);
1999
2000         if (ni->ni_ncpts == 1)
2001                 return ni->ni_net->net_tunables.lct_max_tx_credits;
2002
2003         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
2004         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
2005         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
2006
2007         return credits;
2008 }
2009
2010 static void
2011 lnet_ni_unlink_locked(struct lnet_ni *ni)
2012 {
2013         /* move it to zombie list and nobody can find it anymore */
2014         LASSERT(!list_empty(&ni->ni_netlist));
2015         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
2016         lnet_ni_decref_locked(ni, 0);
2017 }
2018
2019 static void
2020 lnet_clear_zombies_nis_locked(struct lnet_net *net)
2021 {
2022         int             i;
2023         int             islo;
2024         struct lnet_ni  *ni;
2025         struct list_head *zombie_list = &net->net_ni_zombie;
2026
2027         /*
2028          * Now wait for the NIs I just nuked to show up on the zombie
2029          * list and shut them down in guaranteed thread context
2030          */
2031         i = 2;
2032         while (!list_empty(zombie_list)) {
2033                 int     *ref;
2034                 int     j;
2035
2036                 ni = list_entry(zombie_list->next,
2037                                 struct lnet_ni, ni_netlist);
2038                 list_del_init(&ni->ni_netlist);
2039                 /* the ni should be in deleting state. If it's not it's
2040                  * a bug */
2041                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
2042                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
2043                         if (*ref == 0)
2044                                 continue;
2045                         /* still busy, add it back to zombie list */
2046                         list_add(&ni->ni_netlist, zombie_list);
2047                         break;
2048                 }
2049
2050                 if (!list_empty(&ni->ni_netlist)) {
2051                         lnet_net_unlock(LNET_LOCK_EX);
2052                         ++i;
2053                         if ((i & (-i)) == i) {
2054                                 CDEBUG(D_WARNING,
2055                                        "Waiting for zombie LNI %s\n",
2056                                        libcfs_nid2str(ni->ni_nid));
2057                         }
2058                         schedule_timeout_uninterruptible(cfs_time_seconds(1));
2059                         lnet_net_lock(LNET_LOCK_EX);
2060                         continue;
2061                 }
2062
2063                 lnet_net_unlock(LNET_LOCK_EX);
2064
2065                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
2066
2067                 LASSERT(!in_interrupt());
2068                 /* Holding the mutex makes it safe for lnd_shutdown
2069                  * to call module_put(). Module unload cannot finish
2070                  * until lnet_unregister_lnd() completes, and that
2071                  * requires the mutex.
2072                  */
2073                 mutex_lock(&the_lnet.ln_lnd_mutex);
2074                 (net->net_lnd->lnd_shutdown)(ni);
2075                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2076
2077                 if (!islo)
2078                         CDEBUG(D_LNI, "Removed LNI %s\n",
2079                               libcfs_nid2str(ni->ni_nid));
2080
2081                 lnet_ni_free(ni);
2082                 i = 2;
2083                 lnet_net_lock(LNET_LOCK_EX);
2084         }
2085 }
2086
2087 /* shutdown down the NI and release refcount */
2088 static void
2089 lnet_shutdown_lndni(struct lnet_ni *ni)
2090 {
2091         int i;
2092         struct lnet_net *net = ni->ni_net;
2093
2094         lnet_net_lock(LNET_LOCK_EX);
2095         lnet_ni_lock(ni);
2096         ni->ni_state = LNET_NI_STATE_DELETING;
2097         lnet_ni_unlock(ni);
2098         lnet_ni_unlink_locked(ni);
2099         lnet_incr_dlc_seq();
2100         lnet_net_unlock(LNET_LOCK_EX);
2101
2102         /* clear messages for this NI on the lazy portal */
2103         for (i = 0; i < the_lnet.ln_nportals; i++)
2104                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
2105
2106         lnet_net_lock(LNET_LOCK_EX);
2107         lnet_clear_zombies_nis_locked(net);
2108         lnet_net_unlock(LNET_LOCK_EX);
2109 }
2110
2111 static void
2112 lnet_shutdown_lndnet(struct lnet_net *net)
2113 {
2114         struct lnet_ni *ni;
2115
2116         lnet_net_lock(LNET_LOCK_EX);
2117
2118         list_del_init(&net->net_list);
2119
2120         while (!list_empty(&net->net_ni_list)) {
2121                 ni = list_entry(net->net_ni_list.next,
2122                                 struct lnet_ni, ni_netlist);
2123                 lnet_net_unlock(LNET_LOCK_EX);
2124                 lnet_shutdown_lndni(ni);
2125                 lnet_net_lock(LNET_LOCK_EX);
2126         }
2127
2128         lnet_net_unlock(LNET_LOCK_EX);
2129
2130         /* Do peer table cleanup for this net */
2131         lnet_peer_tables_cleanup(net);
2132
2133         lnet_net_free(net);
2134 }
2135
2136 static void
2137 lnet_shutdown_lndnets(void)
2138 {
2139         struct lnet_net *net;
2140         LIST_HEAD(resend);
2141         struct lnet_msg *msg, *tmp;
2142
2143         /* NB called holding the global mutex */
2144
2145         /* All quiet on the API front */
2146         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
2147         LASSERT(the_lnet.ln_refcount == 0);
2148
2149         lnet_net_lock(LNET_LOCK_EX);
2150         the_lnet.ln_state = LNET_STATE_STOPPING;
2151
2152         /*
2153          * move the nets to the zombie list to avoid them being
2154          * picked up for new work. LONET is also included in the
2155          * Nets that will be moved to the zombie list
2156          */
2157         list_splice_init(&the_lnet.ln_nets, &the_lnet.ln_net_zombie);
2158
2159         /* Drop the cached loopback Net. */
2160         if (the_lnet.ln_loni != NULL) {
2161                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
2162                 the_lnet.ln_loni = NULL;
2163         }
2164         lnet_net_unlock(LNET_LOCK_EX);
2165
2166         /* iterate through the net zombie list and delete each net */
2167         while (!list_empty(&the_lnet.ln_net_zombie)) {
2168                 net = list_entry(the_lnet.ln_net_zombie.next,
2169                                  struct lnet_net, net_list);
2170                 lnet_shutdown_lndnet(net);
2171         }
2172
2173         spin_lock(&the_lnet.ln_msg_resend_lock);
2174         list_splice(&the_lnet.ln_msg_resend, &resend);
2175         spin_unlock(&the_lnet.ln_msg_resend_lock);
2176
2177         list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
2178                 list_del_init(&msg->msg_list);
2179                 msg->msg_no_resend = true;
2180                 lnet_finalize(msg, -ECANCELED);
2181         }
2182
2183         lnet_net_lock(LNET_LOCK_EX);
2184         the_lnet.ln_state = LNET_STATE_SHUTDOWN;
2185         lnet_net_unlock(LNET_LOCK_EX);
2186 }
2187
2188 static int
2189 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
2190 {
2191         int                     rc = -EINVAL;
2192         struct lnet_tx_queue    *tq;
2193         int                     i;
2194         struct lnet_net         *net = ni->ni_net;
2195
2196         mutex_lock(&the_lnet.ln_lnd_mutex);
2197
2198         if (tun) {
2199                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
2200                 ni->ni_lnd_tunables_set = true;
2201         }
2202
2203         rc = (net->net_lnd->lnd_startup)(ni);
2204
2205         mutex_unlock(&the_lnet.ln_lnd_mutex);
2206
2207         if (rc != 0) {
2208                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
2209                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
2210                 goto failed0;
2211         }
2212
2213         lnet_ni_lock(ni);
2214         ni->ni_state = LNET_NI_STATE_ACTIVE;
2215         lnet_ni_unlock(ni);
2216
2217         /* We keep a reference on the loopback net through the loopback NI */
2218         if (net->net_lnd->lnd_type == LOLND) {
2219                 lnet_ni_addref(ni);
2220                 LASSERT(the_lnet.ln_loni == NULL);
2221                 the_lnet.ln_loni = ni;
2222                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
2223                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
2224                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
2225                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
2226                 return 0;
2227         }
2228
2229         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
2230             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
2231                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
2232                                    libcfs_lnd2str(net->net_lnd->lnd_type),
2233                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
2234                                         "" : "per-peer ");
2235                 /* shutdown the NI since if we get here then it must've already
2236                  * been started
2237                  */
2238                 lnet_shutdown_lndni(ni);
2239                 return -EINVAL;
2240         }
2241
2242         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
2243                 tq->tq_credits_min =
2244                 tq->tq_credits_max =
2245                 tq->tq_credits = lnet_ni_tq_credits(ni);
2246         }
2247
2248         atomic_set(&ni->ni_tx_credits,
2249                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
2250         atomic_set(&ni->ni_healthv, LNET_MAX_HEALTH_VALUE);
2251
2252         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
2253                 libcfs_nid2str(ni->ni_nid),
2254                 ni->ni_net->net_tunables.lct_peer_tx_credits,
2255                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
2256                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
2257                 ni->ni_net->net_tunables.lct_peer_timeout);
2258
2259         return 0;
2260 failed0:
2261         lnet_ni_free(ni);
2262         return rc;
2263 }
2264
2265 static int
2266 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
2267 {
2268         struct lnet_ni *ni;
2269         struct lnet_net *net_l = NULL;
2270         LIST_HEAD(local_ni_list);
2271         int rc;
2272         int ni_count = 0;
2273         __u32 lnd_type;
2274         const struct lnet_lnd  *lnd;
2275         int peer_timeout =
2276                 net->net_tunables.lct_peer_timeout;
2277         int maxtxcredits =
2278                 net->net_tunables.lct_max_tx_credits;
2279         int peerrtrcredits =
2280                 net->net_tunables.lct_peer_rtr_credits;
2281
2282         /*
2283          * make sure that this net is unique. If it isn't then
2284          * we are adding interfaces to an already existing network, and
2285          * 'net' is just a convenient way to pass in the list.
2286          * if it is unique we need to find the LND and load it if
2287          * necessary.
2288          */
2289         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
2290                 lnd_type = LNET_NETTYP(net->net_id);
2291
2292                 mutex_lock(&the_lnet.ln_lnd_mutex);
2293                 lnd = lnet_find_lnd_by_type(lnd_type);
2294
2295                 if (lnd == NULL) {
2296                         mutex_unlock(&the_lnet.ln_lnd_mutex);
2297                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
2298                         mutex_lock(&the_lnet.ln_lnd_mutex);
2299
2300                         lnd = lnet_find_lnd_by_type(lnd_type);
2301                         if (lnd == NULL) {
2302                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2303                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
2304                                 libcfs_lnd2str(lnd_type),
2305                                 libcfs_lnd2modname(lnd_type), rc);
2306 #ifndef HAVE_MODULE_LOADING_SUPPORT
2307                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
2308                                                 "compiled with kernel module "
2309                                                 "loading support.");
2310 #endif
2311                                 rc = -EINVAL;
2312                                 goto failed0;
2313                         }
2314                 }
2315
2316                 net->net_lnd = lnd;
2317
2318                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2319
2320                 net_l = net;
2321         }
2322
2323         /*
2324          * net_l: if the network being added is unique then net_l
2325          *        will point to that network
2326          *        if the network being added is not unique then
2327          *        net_l points to the existing network.
2328          *
2329          * When we enter the loop below, we'll pick NIs off he
2330          * network beign added and start them up, then add them to
2331          * a local ni list. Once we've successfully started all
2332          * the NIs then we join the local NI list (of started up
2333          * networks) with the net_l->net_ni_list, which should
2334          * point to the correct network to add the new ni list to
2335          *
2336          * If any of the new NIs fail to start up, then we want to
2337          * iterate through the local ni list, which should include
2338          * any NIs which were successfully started up, and shut
2339          * them down.
2340          *
2341          * After than we want to delete the network being added,
2342          * to avoid a memory leak.
2343          */
2344
2345         /*
2346          * When a network uses TCP bonding then all its interfaces
2347          * must be specified when the network is first defined: the
2348          * TCP bonding code doesn't allow for interfaces to be added
2349          * or removed.
2350          */
2351         if (net_l != net && net_l != NULL && use_tcp_bonding &&
2352             LNET_NETTYP(net_l->net_id) == SOCKLND) {
2353                 rc = -EINVAL;
2354                 goto failed0;
2355         }
2356
2357         while (!list_empty(&net->net_ni_added)) {
2358                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
2359                                 ni_netlist);
2360                 list_del_init(&ni->ni_netlist);
2361
2362                 /* make sure that the the NI we're about to start
2363                  * up is actually unique. if it's not fail. */
2364                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
2365                                         ni->ni_interfaces[0])) {
2366                         rc = -EEXIST;
2367                         goto failed1;
2368                 }
2369
2370                 /* adjust the pointer the parent network, just in case it
2371                  * the net is a duplicate */
2372                 ni->ni_net = net_l;
2373
2374                 rc = lnet_startup_lndni(ni, tun);
2375
2376                 if (rc < 0)
2377                         goto failed1;
2378
2379                 lnet_ni_addref(ni);
2380                 list_add_tail(&ni->ni_netlist, &local_ni_list);
2381
2382                 ni_count++;
2383         }
2384
2385         lnet_net_lock(LNET_LOCK_EX);
2386         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
2387         lnet_incr_dlc_seq();
2388         lnet_net_unlock(LNET_LOCK_EX);
2389
2390         /* if the network is not unique then we don't want to keep
2391          * it around after we're done. Free it. Otherwise add that
2392          * net to the global the_lnet.ln_nets */
2393         if (net_l != net && net_l != NULL) {
2394                 /*
2395                  * TODO - note. currently the tunables can not be updated
2396                  * once added
2397                  */
2398                 lnet_net_free(net);
2399         } else {
2400                 /*
2401                  * restore tunables after it has been overwitten by the
2402                  * lnd
2403                  */
2404                 if (peer_timeout != -1)
2405                         net->net_tunables.lct_peer_timeout = peer_timeout;
2406                 if (maxtxcredits != -1)
2407                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
2408                 if (peerrtrcredits != -1)
2409                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
2410
2411                 lnet_net_lock(LNET_LOCK_EX);
2412                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
2413                 lnet_net_unlock(LNET_LOCK_EX);
2414         }
2415
2416         /* update net count */
2417         lnet_current_net_count = lnet_get_net_count();
2418
2419         return ni_count;
2420
2421 failed1:
2422         /*
2423          * shutdown the new NIs that are being started up
2424          * free the NET being started
2425          */
2426         while (!list_empty(&local_ni_list)) {
2427                 ni = list_entry(local_ni_list.next, struct lnet_ni,
2428                                 ni_netlist);
2429
2430                 lnet_shutdown_lndni(ni);
2431         }
2432
2433 failed0:
2434         lnet_net_free(net);
2435
2436         return rc;
2437 }
2438
2439 static int
2440 lnet_startup_lndnets(struct list_head *netlist)
2441 {
2442         struct lnet_net         *net;
2443         int                     rc;
2444         int                     ni_count = 0;
2445
2446         /*
2447          * Change to running state before bringing up the LNDs. This
2448          * allows lnet_shutdown_lndnets() to assert that we've passed
2449          * through here.
2450          */
2451         lnet_net_lock(LNET_LOCK_EX);
2452         the_lnet.ln_state = LNET_STATE_RUNNING;
2453         lnet_net_unlock(LNET_LOCK_EX);
2454
2455         while (!list_empty(netlist)) {
2456                 net = list_entry(netlist->next, struct lnet_net, net_list);
2457                 list_del_init(&net->net_list);
2458
2459                 rc = lnet_startup_lndnet(net, NULL);
2460
2461                 if (rc < 0)
2462                         goto failed;
2463
2464                 ni_count += rc;
2465         }
2466
2467         return ni_count;
2468 failed:
2469         lnet_shutdown_lndnets();
2470
2471         return rc;
2472 }
2473
2474 /**
2475  * Initialize LNet library.
2476  *
2477  * Automatically called at module loading time. Caller has to call
2478  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
2479  * latter returned 0. It must be called exactly once.
2480  *
2481  * \retval 0 on success
2482  * \retval -ve on failures.
2483  */
2484 int lnet_lib_init(void)
2485 {
2486         int rc;
2487
2488         lnet_assert_wire_constants();
2489
2490         /* refer to global cfs_cpt_table for now */
2491         the_lnet.ln_cpt_table = cfs_cpt_tab;
2492         the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_tab);
2493
2494         LASSERT(the_lnet.ln_cpt_number > 0);
2495         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
2496                 /* we are under risk of consuming all lh_cookie */
2497                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
2498                        "please change setting of CPT-table and retry\n",
2499                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
2500                 return -E2BIG;
2501         }
2502
2503         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
2504                 the_lnet.ln_cpt_bits++;
2505
2506         rc = lnet_create_locks();
2507         if (rc != 0) {
2508                 CERROR("Can't create LNet global locks: %d\n", rc);
2509                 return rc;
2510         }
2511
2512         the_lnet.ln_refcount = 0;
2513         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
2514         INIT_LIST_HEAD(&the_lnet.ln_msg_resend);
2515
2516         /* The hash table size is the number of bits it takes to express the set
2517          * ln_num_routes, minus 1 (better to under estimate than over so we
2518          * don't waste memory). */
2519         if (rnet_htable_size <= 0)
2520                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
2521         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
2522                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
2523         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
2524                                            order_base_2(rnet_htable_size) - 1);
2525
2526         /* All LNDs apart from the LOLND are in separate modules.  They
2527          * register themselves when their module loads, and unregister
2528          * themselves when their module is unloaded. */
2529         lnet_register_lnd(&the_lolnd);
2530         return 0;
2531 }
2532
2533 /**
2534  * Finalize LNet library.
2535  *
2536  * \pre lnet_lib_init() called with success.
2537  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
2538  *
2539  * As this happens at module-unload, all lnds must already be unloaded,
2540  * so they must already be unregistered.
2541  */
2542 void lnet_lib_exit(void)
2543 {
2544         int i;
2545
2546         LASSERT(the_lnet.ln_refcount == 0);
2547         lnet_unregister_lnd(&the_lolnd);
2548         for (i = 0; i < NUM_LNDS; i++)
2549                 LASSERT(!the_lnet.ln_lnds[i]);
2550         lnet_destroy_locks();
2551 }
2552
2553 /**
2554  * Set LNet PID and start LNet interfaces, routing, and forwarding.
2555  *
2556  * Users must call this function at least once before any other functions.
2557  * For each successful call there must be a corresponding call to
2558  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
2559  * ignored.
2560  *
2561  * The PID used by LNet may be different from the one requested.
2562  * See LNetGetId().
2563  *
2564  * \param requested_pid PID requested by the caller.
2565  *
2566  * \return >= 0 on success, and < 0 error code on failures.
2567  */
2568 int
2569 LNetNIInit(lnet_pid_t requested_pid)
2570 {
2571         int                     im_a_router = 0;
2572         int                     rc;
2573         int                     ni_count;
2574         struct lnet_ping_buffer *pbuf;
2575         struct lnet_handle_md   ping_mdh;
2576         LIST_HEAD(net_head);
2577         struct lnet_net         *net;
2578
2579         mutex_lock(&the_lnet.ln_api_mutex);
2580
2581         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
2582
2583         if (the_lnet.ln_refcount > 0) {
2584                 rc = the_lnet.ln_refcount++;
2585                 mutex_unlock(&the_lnet.ln_api_mutex);
2586                 return rc;
2587         }
2588
2589         rc = lnet_prepare(requested_pid);
2590         if (rc != 0) {
2591                 mutex_unlock(&the_lnet.ln_api_mutex);
2592                 return rc;
2593         }
2594
2595         /* create a network for Loopback network */
2596         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
2597         if (net == NULL) {
2598                 rc = -ENOMEM;
2599                 goto err_empty_list;
2600         }
2601
2602         /* Add in the loopback NI */
2603         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
2604                 rc = -ENOMEM;
2605                 goto err_empty_list;
2606         }
2607
2608         /* If LNet is being initialized via DLC it is possible
2609          * that the user requests not to load module parameters (ones which
2610          * are supported by DLC) on initialization.  Therefore, make sure not
2611          * to load networks, routes and forwarding from module parameters
2612          * in this case.  On cleanup in case of failure only clean up
2613          * routes if it has been loaded */
2614         if (!the_lnet.ln_nis_from_mod_params) {
2615                 rc = lnet_parse_networks(&net_head, lnet_get_networks(),
2616                                          use_tcp_bonding);
2617                 if (rc < 0)
2618                         goto err_empty_list;
2619         }
2620
2621         ni_count = lnet_startup_lndnets(&net_head);
2622         if (ni_count < 0) {
2623                 rc = ni_count;
2624                 goto err_empty_list;
2625         }
2626
2627         if (!the_lnet.ln_nis_from_mod_params) {
2628                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
2629                 if (rc != 0)
2630                         goto err_shutdown_lndnis;
2631
2632                 rc = lnet_rtrpools_alloc(im_a_router);
2633                 if (rc != 0)
2634                         goto err_destroy_routes;
2635         }
2636
2637         rc = lnet_acceptor_start();
2638         if (rc != 0)
2639                 goto err_destroy_routes;
2640
2641         the_lnet.ln_refcount = 1;
2642         /* Now I may use my own API functions... */
2643
2644         rc = lnet_ping_target_setup(&pbuf, &ping_mdh, ni_count, true);
2645         if (rc != 0)
2646                 goto err_acceptor_stop;
2647
2648         lnet_ping_target_update(pbuf, ping_mdh);
2649
2650         the_lnet.ln_mt_eq = LNetEQAlloc(lnet_mt_event_handler);
2651         if (IS_ERR(the_lnet.ln_mt_eq)) {
2652                 rc = PTR_ERR(the_lnet.ln_mt_eq);
2653                 CERROR("Can't allocate monitor thread EQ: %d\n", rc);
2654                 goto err_stop_ping;
2655         }
2656
2657         rc = lnet_push_target_init();
2658         if (rc != 0)
2659                 goto err_stop_ping;
2660
2661         rc = lnet_peer_discovery_start();
2662         if (rc != 0)
2663                 goto err_destroy_push_target;
2664
2665         rc = lnet_monitor_thr_start();
2666         if (rc != 0)
2667                 goto err_stop_discovery_thr;
2668
2669         lnet_fault_init();
2670         lnet_router_debugfs_init();
2671
2672         mutex_unlock(&the_lnet.ln_api_mutex);
2673
2674         complete_all(&the_lnet.ln_started);
2675
2676         /* wait for all routers to start */
2677         lnet_wait_router_start();
2678
2679         return 0;
2680
2681 err_stop_discovery_thr:
2682         lnet_peer_discovery_stop();
2683 err_destroy_push_target:
2684         lnet_push_target_fini();
2685 err_stop_ping:
2686         lnet_ping_target_fini();
2687 err_acceptor_stop:
2688         the_lnet.ln_refcount = 0;
2689         lnet_acceptor_stop();
2690 err_destroy_routes:
2691         if (!the_lnet.ln_nis_from_mod_params)
2692                 lnet_destroy_routes();
2693 err_shutdown_lndnis:
2694         lnet_shutdown_lndnets();
2695 err_empty_list:
2696         lnet_unprepare();
2697         LASSERT(rc < 0);
2698         mutex_unlock(&the_lnet.ln_api_mutex);
2699         while (!list_empty(&net_head)) {
2700                 struct lnet_net *net;
2701
2702                 net = list_entry(net_head.next, struct lnet_net, net_list);
2703                 list_del_init(&net->net_list);
2704                 lnet_net_free(net);
2705         }
2706         return rc;
2707 }
2708 EXPORT_SYMBOL(LNetNIInit);
2709
2710 /**
2711  * Stop LNet interfaces, routing, and forwarding.
2712  *
2713  * Users must call this function once for each successful call to LNetNIInit().
2714  * Once the LNetNIFini() operation has been started, the results of pending
2715  * API operations are undefined.
2716  *
2717  * \return always 0 for current implementation.
2718  */
2719 int
2720 LNetNIFini(void)
2721 {
2722         mutex_lock(&the_lnet.ln_api_mutex);
2723
2724         LASSERT(the_lnet.ln_refcount > 0);
2725
2726         if (the_lnet.ln_refcount != 1) {
2727                 the_lnet.ln_refcount--;
2728         } else {
2729                 LASSERT(!the_lnet.ln_niinit_self);
2730
2731                 lnet_fault_fini();
2732
2733                 lnet_router_debugfs_fini();
2734                 lnet_monitor_thr_stop();
2735                 lnet_peer_discovery_stop();
2736                 lnet_push_target_fini();
2737                 lnet_ping_target_fini();
2738
2739                 /* Teardown fns that use my own API functions BEFORE here */
2740                 the_lnet.ln_refcount = 0;
2741
2742                 lnet_acceptor_stop();
2743                 lnet_destroy_routes();
2744                 lnet_shutdown_lndnets();
2745                 lnet_unprepare();
2746         }
2747
2748         mutex_unlock(&the_lnet.ln_api_mutex);
2749         return 0;
2750 }
2751 EXPORT_SYMBOL(LNetNIFini);
2752
2753 /**
2754  * Grabs the ni data from the ni structure and fills the out
2755  * parameters
2756  *
2757  * \param[in] ni network        interface structure
2758  * \param[out] cfg_ni           NI config information
2759  * \param[out] tun              network and LND tunables
2760  */
2761 static void
2762 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
2763                    struct lnet_ioctl_config_lnd_tunables *tun,
2764                    struct lnet_ioctl_element_stats *stats,
2765                    __u32 tun_size)
2766 {
2767         size_t min_size = 0;
2768         int i;
2769
2770         if (!ni || !cfg_ni || !tun)
2771                 return;
2772
2773         if (ni->ni_interfaces[0] != NULL) {
2774                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2775                         if (ni->ni_interfaces[i] != NULL) {
2776                                 strncpy(cfg_ni->lic_ni_intf[i],
2777                                         ni->ni_interfaces[i],
2778                                         sizeof(cfg_ni->lic_ni_intf[i]));
2779                         }
2780                 }
2781         }
2782
2783         cfg_ni->lic_nid = ni->ni_nid;
2784         if (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND)
2785                 cfg_ni->lic_status = LNET_NI_STATUS_UP;
2786         else
2787                 cfg_ni->lic_status = ni->ni_status->ns_status;
2788         cfg_ni->lic_tcp_bonding = use_tcp_bonding;
2789         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
2790
2791         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
2792
2793         if (stats) {
2794                 stats->iel_send_count = lnet_sum_stats(&ni->ni_stats,
2795                                                        LNET_STATS_TYPE_SEND);
2796                 stats->iel_recv_count = lnet_sum_stats(&ni->ni_stats,
2797                                                        LNET_STATS_TYPE_RECV);
2798                 stats->iel_drop_count = lnet_sum_stats(&ni->ni_stats,
2799                                                        LNET_STATS_TYPE_DROP);
2800         }
2801
2802         /*
2803          * tun->lt_tun will always be present, but in order to be
2804          * backwards compatible, we need to deal with the cases when
2805          * tun->lt_tun is smaller than what the kernel has, because it
2806          * comes from an older version of a userspace program, then we'll
2807          * need to copy as much information as we have available space.
2808          */
2809         min_size = tun_size - sizeof(tun->lt_cmn);
2810         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
2811
2812         /* copy over the cpts */
2813         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
2814             ni->ni_cpts == NULL)  {
2815                 for (i = 0; i < ni->ni_ncpts; i++)
2816                         cfg_ni->lic_cpts[i] = i;
2817         } else {
2818                 for (i = 0;
2819                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
2820                      i < LNET_MAX_SHOW_NUM_CPT;
2821                      i++)
2822                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
2823         }
2824         cfg_ni->lic_ncpts = ni->ni_ncpts;
2825 }
2826
2827 /**
2828  * NOTE: This is a legacy function left in the code to be backwards
2829  * compatible with older userspace programs. It should eventually be
2830  * removed.
2831  *
2832  * Grabs the ni data from the ni structure and fills the out
2833  * parameters
2834  *
2835  * \param[in] ni network        interface structure
2836  * \param[out] config           config information
2837  */
2838 static void
2839 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
2840                          struct lnet_ioctl_config_data *config)
2841 {
2842         struct lnet_ioctl_net_config *net_config;
2843         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
2844         size_t min_size, tunable_size = 0;
2845         int i;
2846
2847         if (!ni || !config)
2848                 return;
2849
2850         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
2851         if (!net_config)
2852                 return;
2853
2854         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
2855                      ARRAY_SIZE(net_config->ni_interfaces));
2856
2857         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2858                 if (!ni->ni_interfaces[i])
2859                         break;
2860
2861                 strncpy(net_config->ni_interfaces[i],
2862                         ni->ni_interfaces[i],
2863                         sizeof(net_config->ni_interfaces[i]));
2864         }
2865
2866         config->cfg_nid = ni->ni_nid;
2867         config->cfg_config_u.cfg_net.net_peer_timeout =
2868                 ni->ni_net->net_tunables.lct_peer_timeout;
2869         config->cfg_config_u.cfg_net.net_max_tx_credits =
2870                 ni->ni_net->net_tunables.lct_max_tx_credits;
2871         config->cfg_config_u.cfg_net.net_peer_tx_credits =
2872                 ni->ni_net->net_tunables.lct_peer_tx_credits;
2873         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
2874                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
2875
2876         if (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND)
2877                 net_config->ni_status = LNET_NI_STATUS_UP;
2878         else
2879                 net_config->ni_status = ni->ni_status->ns_status;
2880
2881         if (ni->ni_cpts) {
2882                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
2883
2884                 for (i = 0; i < num_cpts; i++)
2885                         net_config->ni_cpts[i] = ni->ni_cpts[i];
2886
2887                 config->cfg_ncpts = num_cpts;
2888         }
2889
2890         /*
2891          * See if user land tools sent in a newer and larger version
2892          * of struct lnet_tunables than what the kernel uses.
2893          */
2894         min_size = sizeof(*config) + sizeof(*net_config);
2895
2896         if (config->cfg_hdr.ioc_len > min_size)
2897                 tunable_size = config->cfg_hdr.ioc_len - min_size;
2898
2899         /* Don't copy too much data to user space */
2900         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
2901         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
2902
2903         if (lnd_cfg && min_size) {
2904                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
2905                 config->cfg_config_u.cfg_net.net_interface_count = 1;
2906
2907                 /* Tell user land that kernel side has less data */
2908                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
2909                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
2910                         config->cfg_hdr.ioc_len -= min_size;
2911                 }
2912         }
2913 }
2914
2915 struct lnet_ni *
2916 lnet_get_ni_idx_locked(int idx)
2917 {
2918         struct lnet_ni          *ni;
2919         struct lnet_net         *net;
2920
2921         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2922                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2923                         if (idx-- == 0)
2924                                 return ni;
2925                 }
2926         }
2927
2928         return NULL;
2929 }
2930
2931 struct lnet_ni *
2932 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
2933 {
2934         struct lnet_ni          *ni;
2935         struct lnet_net         *net = mynet;
2936
2937         /*
2938          * It is possible that the net has been cleaned out while there is
2939          * a message being sent. This function accessed the net without
2940          * checking if the list is empty
2941          */
2942         if (prev == NULL) {
2943                 if (net == NULL)
2944                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
2945                                         net_list);
2946                 if (list_empty(&net->net_ni_list))
2947                         return NULL;
2948                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2949                                 ni_netlist);
2950
2951                 return ni;
2952         }
2953
2954         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
2955                 /* if you reached the end of the ni list and the net is
2956                  * specified, then there are no more nis in that net */
2957                 if (net != NULL)
2958                         return NULL;
2959
2960                 /* we reached the end of this net ni list. move to the
2961                  * next net */
2962                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
2963                         /* no more nets and no more NIs. */
2964                         return NULL;
2965
2966                 /* get the next net */
2967                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
2968                                  net_list);
2969                 if (list_empty(&net->net_ni_list))
2970                         return NULL;
2971                 /* get the ni on it */
2972                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2973                                 ni_netlist);
2974
2975                 return ni;
2976         }
2977
2978         if (list_empty(&prev->ni_netlist))
2979                 return NULL;
2980
2981         /* there are more nis left */
2982         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
2983
2984         return ni;
2985 }
2986
2987 int
2988 lnet_get_net_config(struct lnet_ioctl_config_data *config)
2989 {
2990         struct lnet_ni *ni;
2991         int cpt;
2992         int rc = -ENOENT;
2993         int idx = config->cfg_count;
2994
2995         cpt = lnet_net_lock_current();
2996
2997         ni = lnet_get_ni_idx_locked(idx);
2998
2999         if (ni != NULL) {
3000                 rc = 0;
3001                 lnet_ni_lock(ni);
3002                 lnet_fill_ni_info_legacy(ni, config);
3003                 lnet_ni_unlock(ni);
3004         }
3005
3006         lnet_net_unlock(cpt);
3007         return rc;
3008 }
3009
3010 int
3011 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
3012                    struct lnet_ioctl_config_lnd_tunables *tun,
3013                    struct lnet_ioctl_element_stats *stats,
3014                    __u32 tun_size)
3015 {
3016         struct lnet_ni          *ni;
3017         int                     cpt;
3018         int                     rc = -ENOENT;
3019
3020         if (!cfg_ni || !tun || !stats)
3021                 return -EINVAL;
3022
3023         cpt = lnet_net_lock_current();
3024
3025         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
3026
3027         if (ni) {
3028                 rc = 0;
3029                 lnet_ni_lock(ni);
3030                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
3031                 lnet_ni_unlock(ni);
3032         }
3033
3034         lnet_net_unlock(cpt);
3035         return rc;
3036 }
3037
3038 int lnet_get_ni_stats(struct lnet_ioctl_element_msg_stats *msg_stats)
3039 {
3040         struct lnet_ni *ni;
3041         int cpt;
3042         int rc = -ENOENT;
3043
3044         if (!msg_stats)
3045                 return -EINVAL;
3046
3047         cpt = lnet_net_lock_current();
3048
3049         ni = lnet_get_ni_idx_locked(msg_stats->im_idx);
3050
3051         if (ni) {
3052                 lnet_usr_translate_stats(msg_stats, &ni->ni_stats);
3053                 rc = 0;
3054         }
3055
3056         lnet_net_unlock(cpt);
3057
3058         return rc;
3059 }
3060
3061 static int lnet_add_net_common(struct lnet_net *net,
3062                                struct lnet_ioctl_config_lnd_tunables *tun)
3063 {
3064         __u32                   net_id;
3065         struct lnet_ping_buffer *pbuf;
3066         struct lnet_handle_md   ping_mdh;
3067         int                     rc;
3068         struct lnet_remotenet *rnet;
3069         int                     net_ni_count;
3070         int                     num_acceptor_nets;
3071
3072         lnet_net_lock(LNET_LOCK_EX);
3073         rnet = lnet_find_rnet_locked(net->net_id);
3074         lnet_net_unlock(LNET_LOCK_EX);
3075         /*
3076          * make sure that the net added doesn't invalidate the current
3077          * configuration LNet is keeping
3078          */
3079         if (rnet) {
3080                 CERROR("Adding net %s will invalidate routing configuration\n",
3081                        libcfs_net2str(net->net_id));
3082                 lnet_net_free(net);
3083                 return -EUSERS;
3084         }
3085
3086         /*
3087          * make sure you calculate the correct number of slots in the ping
3088          * buffer. Since the ping info is a flattened list of all the NIs,
3089          * we should allocate enough slots to accomodate the number of NIs
3090          * which will be added.
3091          *
3092          * since ni hasn't been configured yet, use
3093          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
3094          */
3095         net_ni_count = lnet_get_net_ni_count_pre(net);
3096
3097         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3098                                     net_ni_count + lnet_get_ni_count(),
3099                                     false);
3100         if (rc < 0) {
3101                 lnet_net_free(net);
3102                 return rc;
3103         }
3104
3105         if (tun)
3106                 memcpy(&net->net_tunables,
3107                        &tun->lt_cmn, sizeof(net->net_tunables));
3108         else
3109                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
3110
3111         /*
3112          * before starting this network get a count of the current TCP
3113          * networks which require the acceptor thread running. If that
3114          * count is == 0 before we start up this network, then we'd want to
3115          * start up the acceptor thread after starting up this network
3116          */
3117         num_acceptor_nets = lnet_count_acceptor_nets();
3118
3119         net_id = net->net_id;
3120
3121         rc = lnet_startup_lndnet(net,
3122                                  (tun) ? &tun->lt_tun : NULL);
3123         if (rc < 0)
3124                 goto failed;
3125
3126         lnet_net_lock(LNET_LOCK_EX);
3127         net = lnet_get_net_locked(net_id);
3128         lnet_net_unlock(LNET_LOCK_EX);
3129
3130         LASSERT(net);
3131
3132         /*
3133          * Start the acceptor thread if this is the first network
3134          * being added that requires the thread.
3135          */
3136         if (net->net_lnd->lnd_accept && num_acceptor_nets == 0) {
3137                 rc = lnet_acceptor_start();
3138                 if (rc < 0) {
3139                         /* shutdown the net that we just started */
3140                         CERROR("Failed to start up acceptor thread\n");
3141                         lnet_shutdown_lndnet(net);
3142                         goto failed;
3143                 }
3144         }
3145
3146         lnet_net_lock(LNET_LOCK_EX);
3147         lnet_peer_net_added(net);
3148         lnet_net_unlock(LNET_LOCK_EX);
3149
3150         lnet_ping_target_update(pbuf, ping_mdh);
3151
3152         return 0;
3153
3154 failed:
3155         lnet_ping_md_unlink(pbuf, &ping_mdh);
3156         lnet_ping_buffer_decref(pbuf);
3157         return rc;
3158 }
3159
3160 static int lnet_handle_legacy_ip2nets(char *ip2nets,
3161                                       struct lnet_ioctl_config_lnd_tunables *tun)
3162 {
3163         struct lnet_net *net;
3164         char *nets;
3165         int rc;
3166         LIST_HEAD(net_head);
3167
3168         rc = lnet_parse_ip2nets(&nets, ip2nets);
3169         if (rc < 0)
3170                 return rc;
3171
3172         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3173         if (rc < 0)
3174                 return rc;
3175
3176         mutex_lock(&the_lnet.ln_api_mutex);
3177         while (!list_empty(&net_head)) {
3178                 net = list_entry(net_head.next, struct lnet_net, net_list);
3179                 list_del_init(&net->net_list);
3180                 rc = lnet_add_net_common(net, tun);
3181                 if (rc < 0)
3182                         goto out;
3183         }
3184
3185 out:
3186         mutex_unlock(&the_lnet.ln_api_mutex);
3187
3188         while (!list_empty(&net_head)) {
3189                 net = list_entry(net_head.next, struct lnet_net, net_list);
3190                 list_del_init(&net->net_list);
3191                 lnet_net_free(net);
3192         }
3193         return rc;
3194 }
3195
3196 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
3197 {
3198         struct lnet_net *net;
3199         struct lnet_ni *ni;
3200         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3201         int rc, i;
3202         __u32 net_id, lnd_type;
3203
3204         /* get the tunables if they are available */
3205         if (conf->lic_cfg_hdr.ioc_len >=
3206             sizeof(*conf) + sizeof(*tun))
3207                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3208                         conf->lic_bulk;
3209
3210         /* handle legacy ip2nets from DLC */
3211         if (conf->lic_legacy_ip2nets[0] != '\0')
3212                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
3213                                                   tun);
3214
3215         net_id = LNET_NIDNET(conf->lic_nid);
3216         lnd_type = LNET_NETTYP(net_id);
3217
3218         if (!libcfs_isknown_lnd(lnd_type)) {
3219                 CERROR("No valid net and lnd information provided\n");
3220                 return -EINVAL;
3221         }
3222
3223         net = lnet_net_alloc(net_id, NULL);
3224         if (!net)
3225                 return -ENOMEM;
3226
3227         for (i = 0; i < conf->lic_ncpts; i++) {
3228                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
3229                         return -EINVAL;
3230         }
3231
3232         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
3233                                        conf->lic_ni_intf[0]);
3234         if (!ni)
3235                 return -ENOMEM;
3236
3237         mutex_lock(&the_lnet.ln_api_mutex);
3238
3239         rc = lnet_add_net_common(net, tun);
3240
3241         mutex_unlock(&the_lnet.ln_api_mutex);
3242
3243         return rc;
3244 }
3245
3246 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
3247 {
3248         struct lnet_net  *net;
3249         struct lnet_ni *ni;
3250         __u32 net_id = LNET_NIDNET(conf->lic_nid);
3251         struct lnet_ping_buffer *pbuf;
3252         struct lnet_handle_md  ping_mdh;
3253         int               rc;
3254         int               net_count;
3255         __u32             addr;
3256
3257         /* don't allow userspace to shutdown the LOLND */
3258         if (LNET_NETTYP(net_id) == LOLND)
3259                 return -EINVAL;
3260
3261         mutex_lock(&the_lnet.ln_api_mutex);
3262
3263         lnet_net_lock(0);
3264
3265         net = lnet_get_net_locked(net_id);
3266         if (!net) {
3267                 CERROR("net %s not found\n",
3268                        libcfs_net2str(net_id));
3269                 rc = -ENOENT;
3270                 goto unlock_net;
3271         }
3272
3273         addr = LNET_NIDADDR(conf->lic_nid);
3274         if (addr == 0) {
3275                 /* remove the entire net */
3276                 net_count = lnet_get_net_ni_count_locked(net);
3277
3278                 lnet_net_unlock(0);
3279
3280                 /* create and link a new ping info, before removing the old one */
3281                 rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3282                                         lnet_get_ni_count() - net_count,
3283                                         false);
3284                 if (rc != 0)
3285                         goto unlock_api_mutex;
3286
3287                 lnet_shutdown_lndnet(net);
3288
3289                 if (lnet_count_acceptor_nets() == 0)
3290                         lnet_acceptor_stop();
3291
3292                 lnet_ping_target_update(pbuf, ping_mdh);
3293
3294                 goto unlock_api_mutex;
3295         }
3296
3297         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
3298         if (!ni) {
3299                 CERROR("nid %s not found\n",
3300                        libcfs_nid2str(conf->lic_nid));
3301                 rc = -ENOENT;
3302                 goto unlock_net;
3303         }
3304
3305         net_count = lnet_get_net_ni_count_locked(net);
3306
3307         lnet_net_unlock(0);
3308
3309         /* create and link a new ping info, before removing the old one */
3310         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3311                                   lnet_get_ni_count() - 1, false);
3312         if (rc != 0)
3313                 goto unlock_api_mutex;
3314
3315         lnet_shutdown_lndni(ni);
3316
3317         if (lnet_count_acceptor_nets() == 0)
3318                 lnet_acceptor_stop();
3319
3320         lnet_ping_target_update(pbuf, ping_mdh);
3321
3322         /* check if the net is empty and remove it if it is */
3323         if (net_count == 1)
3324                 lnet_shutdown_lndnet(net);
3325
3326         goto unlock_api_mutex;
3327
3328 unlock_net:
3329         lnet_net_unlock(0);
3330 unlock_api_mutex:
3331         mutex_unlock(&the_lnet.ln_api_mutex);
3332
3333         return rc;
3334 }
3335
3336 /*
3337  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
3338  * They are only expected to be called for unique networks.
3339  * That can be as a result of older DLC library
3340  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
3341  */
3342 int
3343 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
3344 {
3345         struct lnet_net *net;
3346         LIST_HEAD(net_head);
3347         int rc;
3348         struct lnet_ioctl_config_lnd_tunables tun;
3349         char *nets = conf->cfg_config_u.cfg_net.net_intf;
3350
3351         /* Create a net/ni structures for the network string */
3352         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3353         if (rc <= 0)
3354                 return rc == 0 ? -EINVAL : rc;
3355
3356         mutex_lock(&the_lnet.ln_api_mutex);
3357
3358         if (rc > 1) {
3359                 rc = -EINVAL; /* only add one network per call */
3360                 goto out_unlock_clean;
3361         }
3362
3363         net = list_entry(net_head.next, struct lnet_net, net_list);
3364         list_del_init(&net->net_list);
3365
3366         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
3367
3368         memset(&tun, 0, sizeof(tun));
3369
3370         tun.lt_cmn.lct_peer_timeout =
3371           conf->cfg_config_u.cfg_net.net_peer_timeout;
3372         tun.lt_cmn.lct_peer_tx_credits =
3373           conf->cfg_config_u.cfg_net.net_peer_tx_credits;
3374         tun.lt_cmn.lct_peer_rtr_credits =
3375           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
3376         tun.lt_cmn.lct_max_tx_credits =
3377           conf->cfg_config_u.cfg_net.net_max_tx_credits;
3378
3379         rc = lnet_add_net_common(net, &tun);
3380
3381 out_unlock_clean:
3382         mutex_unlock(&the_lnet.ln_api_mutex);
3383         while (!list_empty(&net_head)) {
3384                 /* net_head list is empty in success case */
3385                 net = list_entry(net_head.next, struct lnet_net, net_list);
3386                 list_del_init(&net->net_list);
3387                 lnet_net_free(net);
3388         }
3389         return rc;
3390 }
3391
3392 int
3393 lnet_dyn_del_net(__u32 net_id)
3394 {
3395         struct lnet_net  *net;
3396         struct lnet_ping_buffer *pbuf;
3397         struct lnet_handle_md ping_mdh;
3398         int               rc;
3399         int               net_ni_count;
3400
3401         /* don't allow userspace to shutdown the LOLND */
3402         if (LNET_NETTYP(net_id) == LOLND)
3403                 return -EINVAL;
3404
3405         mutex_lock(&the_lnet.ln_api_mutex);
3406
3407         lnet_net_lock(0);
3408
3409         net = lnet_get_net_locked(net_id);
3410         if (net == NULL) {
3411                 lnet_net_unlock(0);
3412                 rc = -EINVAL;
3413                 goto out;
3414         }
3415
3416         net_ni_count = lnet_get_net_ni_count_locked(net);
3417
3418         lnet_net_unlock(0);
3419
3420         /* create and link a new ping info, before removing the old one */
3421         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3422                                     lnet_get_ni_count() - net_ni_count, false);
3423         if (rc != 0)
3424                 goto out;
3425
3426         lnet_shutdown_lndnet(net);
3427
3428         if (lnet_count_acceptor_nets() == 0)
3429                 lnet_acceptor_stop();
3430
3431         lnet_ping_target_update(pbuf, ping_mdh);
3432
3433 out:
3434         mutex_unlock(&the_lnet.ln_api_mutex);
3435
3436         return rc;
3437 }
3438
3439 void lnet_incr_dlc_seq(void)
3440 {
3441         atomic_inc(&lnet_dlc_seq_no);
3442 }
3443
3444 __u32 lnet_get_dlc_seq_locked(void)
3445 {
3446         return atomic_read(&lnet_dlc_seq_no);
3447 }
3448
3449 static void
3450 lnet_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3451 {
3452         struct lnet_net *net;
3453         struct lnet_ni *ni;
3454
3455         lnet_net_lock(LNET_LOCK_EX);
3456         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3457                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3458                         if (ni->ni_nid == nid || all) {
3459                                 atomic_set(&ni->ni_healthv, value);
3460                                 if (list_empty(&ni->ni_recovery) &&
3461                                     value < LNET_MAX_HEALTH_VALUE) {
3462                                         CERROR("manually adding local NI %s to recovery\n",
3463                                                libcfs_nid2str(ni->ni_nid));
3464                                         list_add_tail(&ni->ni_recovery,
3465                                                       &the_lnet.ln_mt_localNIRecovq);
3466                                         lnet_ni_addref_locked(ni, 0);
3467                                 }
3468                                 if (!all) {
3469                                         lnet_net_unlock(LNET_LOCK_EX);
3470                                         return;
3471                                 }
3472                         }
3473                 }
3474         }
3475         lnet_net_unlock(LNET_LOCK_EX);
3476 }
3477
3478 static int
3479 lnet_get_local_ni_hstats(struct lnet_ioctl_local_ni_hstats *stats)
3480 {
3481         int cpt, rc = 0;
3482         struct lnet_ni *ni;
3483         lnet_nid_t nid = stats->hlni_nid;
3484
3485         cpt = lnet_net_lock_current();
3486         ni = lnet_nid2ni_locked(nid, cpt);
3487
3488         if (!ni) {
3489                 rc = -ENOENT;
3490                 goto unlock;
3491         }
3492
3493         stats->hlni_local_interrupt = atomic_read(&ni->ni_hstats.hlt_local_interrupt);
3494         stats->hlni_local_dropped = atomic_read(&ni->ni_hstats.hlt_local_dropped);
3495         stats->hlni_local_aborted = atomic_read(&ni->ni_hstats.hlt_local_aborted);
3496         stats->hlni_local_no_route = atomic_read(&ni->ni_hstats.hlt_local_no_route);
3497         stats->hlni_local_timeout = atomic_read(&ni->ni_hstats.hlt_local_timeout);
3498         stats->hlni_local_error = atomic_read(&ni->ni_hstats.hlt_local_error);
3499         stats->hlni_health_value = atomic_read(&ni->ni_healthv);
3500
3501 unlock:
3502         lnet_net_unlock(cpt);
3503
3504         return rc;
3505 }
3506
3507 static int
3508 lnet_get_local_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3509 {
3510         struct lnet_ni *ni;
3511         int i = 0;
3512
3513         lnet_net_lock(LNET_LOCK_EX);
3514         list_for_each_entry(ni, &the_lnet.ln_mt_localNIRecovq, ni_recovery) {
3515                 list->rlst_nid_array[i] = ni->ni_nid;
3516                 i++;
3517                 if (i >= LNET_MAX_SHOW_NUM_NID)
3518                         break;
3519         }
3520         lnet_net_unlock(LNET_LOCK_EX);
3521         list->rlst_num_nids = i;
3522
3523         return 0;
3524 }
3525
3526 static int
3527 lnet_get_peer_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3528 {
3529         struct lnet_peer_ni *lpni;
3530         int i = 0;
3531
3532         lnet_net_lock(LNET_LOCK_EX);
3533         list_for_each_entry(lpni, &the_lnet.ln_mt_peerNIRecovq, lpni_recovery) {
3534                 list->rlst_nid_array[i] = lpni->lpni_nid;
3535                 i++;
3536                 if (i >= LNET_MAX_SHOW_NUM_NID)
3537                         break;
3538         }
3539         lnet_net_unlock(LNET_LOCK_EX);
3540         list->rlst_num_nids = i;
3541
3542         return 0;
3543 }
3544
3545 /**
3546  * LNet ioctl handler.
3547  *
3548  */
3549 int
3550 LNetCtl(unsigned int cmd, void *arg)
3551 {
3552         struct libcfs_ioctl_data *data = arg;
3553         struct lnet_ioctl_config_data *config;
3554         struct lnet_process_id    id = {0};
3555         struct lnet_ni           *ni;
3556         int                       rc;
3557
3558         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
3559                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
3560
3561         switch (cmd) {
3562         case IOC_LIBCFS_GET_NI:
3563                 rc = LNetGetId(data->ioc_count, &id);
3564                 data->ioc_nid = id.nid;
3565                 return rc;
3566
3567         case IOC_LIBCFS_FAIL_NID:
3568                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
3569
3570         case IOC_LIBCFS_ADD_ROUTE: {
3571                 /* default router sensitivity to 1 */
3572                 unsigned int sensitivity = 1;
3573                 config = arg;
3574
3575                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3576                         return -EINVAL;
3577
3578                 if (config->cfg_config_u.cfg_route.rtr_sensitivity) {
3579                         sensitivity =
3580                           config->cfg_config_u.cfg_route.rtr_sensitivity;
3581                 }
3582
3583                 mutex_lock(&the_lnet.ln_api_mutex);
3584                 rc = lnet_add_route(config->cfg_net,
3585                                     config->cfg_config_u.cfg_route.rtr_hop,
3586                                     config->cfg_nid,
3587                                     config->cfg_config_u.cfg_route.
3588                                         rtr_priority, sensitivity);
3589                 mutex_unlock(&the_lnet.ln_api_mutex);
3590                 return rc;
3591         }
3592
3593         case IOC_LIBCFS_DEL_ROUTE:
3594                 config = arg;
3595
3596                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3597                         return -EINVAL;
3598
3599                 mutex_lock(&the_lnet.ln_api_mutex);
3600                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
3601                 mutex_unlock(&the_lnet.ln_api_mutex);
3602                 return rc;
3603
3604         case IOC_LIBCFS_GET_ROUTE:
3605                 config = arg;
3606
3607                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3608                         return -EINVAL;
3609
3610                 mutex_lock(&the_lnet.ln_api_mutex);
3611                 rc = lnet_get_route(config->cfg_count,
3612                                     &config->cfg_net,
3613                                     &config->cfg_config_u.cfg_route.rtr_hop,
3614                                     &config->cfg_nid,
3615                                     &config->cfg_config_u.cfg_route.rtr_flags,
3616                                     &config->cfg_config_u.cfg_route.
3617                                         rtr_priority,
3618                                     &config->cfg_config_u.cfg_route.
3619                                         rtr_sensitivity);
3620                 mutex_unlock(&the_lnet.ln_api_mutex);
3621                 return rc;
3622
3623         case IOC_LIBCFS_GET_LOCAL_NI: {
3624                 struct lnet_ioctl_config_ni *cfg_ni;
3625                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3626                 struct lnet_ioctl_element_stats *stats;
3627                 __u32 tun_size;
3628
3629                 cfg_ni = arg;
3630
3631                 /* get the tunables if they are available */
3632                 if (cfg_ni->lic_cfg_hdr.ioc_len <
3633                     sizeof(*cfg_ni) + sizeof(*stats) + sizeof(*tun))
3634                         return -EINVAL;
3635
3636                 stats = (struct lnet_ioctl_element_stats *)
3637                         cfg_ni->lic_bulk;
3638                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3639                                 (cfg_ni->lic_bulk + sizeof(*stats));
3640
3641                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
3642                         sizeof(*stats);
3643
3644                 mutex_lock(&the_lnet.ln_api_mutex);
3645                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
3646                 mutex_unlock(&the_lnet.ln_api_mutex);
3647                 return rc;
3648         }
3649
3650         case IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS: {
3651                 struct lnet_ioctl_element_msg_stats *msg_stats = arg;
3652
3653                 if (msg_stats->im_hdr.ioc_len != sizeof(*msg_stats))
3654                         return -EINVAL;
3655
3656                 mutex_lock(&the_lnet.ln_api_mutex);
3657                 rc = lnet_get_ni_stats(msg_stats);
3658                 mutex_unlock(&the_lnet.ln_api_mutex);
3659
3660                 return rc;
3661         }
3662
3663         case IOC_LIBCFS_GET_NET: {
3664                 size_t total = sizeof(*config) +
3665                                sizeof(struct lnet_ioctl_net_config);
3666                 config = arg;
3667
3668                 if (config->cfg_hdr.ioc_len < total)
3669                         return -EINVAL;
3670
3671                 mutex_lock(&the_lnet.ln_api_mutex);
3672                 rc = lnet_get_net_config(config);
3673                 mutex_unlock(&the_lnet.ln_api_mutex);
3674                 return rc;
3675         }
3676
3677         case IOC_LIBCFS_GET_LNET_STATS:
3678         {
3679                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
3680
3681                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
3682                         return -EINVAL;
3683
3684                 mutex_lock(&the_lnet.ln_api_mutex);
3685                 lnet_counters_get(&lnet_stats->st_cntrs);
3686                 mutex_unlock(&the_lnet.ln_api_mutex);
3687                 return 0;
3688         }
3689
3690         case IOC_LIBCFS_CONFIG_RTR:
3691                 config = arg;
3692
3693                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3694                         return -EINVAL;
3695
3696                 mutex_lock(&the_lnet.ln_api_mutex);
3697                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
3698                         rc = lnet_rtrpools_enable();
3699                         mutex_unlock(&the_lnet.ln_api_mutex);
3700                         return rc;
3701                 }
3702                 lnet_rtrpools_disable();
3703                 mutex_unlock(&the_lnet.ln_api_mutex);
3704                 return 0;
3705
3706         case IOC_LIBCFS_ADD_BUF:
3707                 config = arg;
3708
3709                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3710                         return -EINVAL;
3711
3712                 mutex_lock(&the_lnet.ln_api_mutex);
3713                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
3714                                                 buf_tiny,
3715                                           config->cfg_config_u.cfg_buffers.
3716                                                 buf_small,
3717                                           config->cfg_config_u.cfg_buffers.
3718                                                 buf_large);
3719                 mutex_unlock(&the_lnet.ln_api_mutex);
3720                 return rc;
3721
3722         case IOC_LIBCFS_SET_NUMA_RANGE: {
3723                 struct lnet_ioctl_set_value *numa;
3724                 numa = arg;
3725                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3726                         return -EINVAL;
3727                 lnet_net_lock(LNET_LOCK_EX);
3728                 lnet_numa_range = numa->sv_value;
3729                 lnet_net_unlock(LNET_LOCK_EX);
3730                 return 0;
3731         }
3732
3733         case IOC_LIBCFS_GET_NUMA_RANGE: {
3734                 struct lnet_ioctl_set_value *numa;
3735                 numa = arg;
3736                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3737                         return -EINVAL;
3738                 numa->sv_value = lnet_numa_range;
3739                 return 0;
3740         }
3741
3742         case IOC_LIBCFS_GET_BUF: {
3743                 struct lnet_ioctl_pool_cfg *pool_cfg;
3744                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
3745
3746                 config = arg;
3747
3748                 if (config->cfg_hdr.ioc_len < total)
3749                         return -EINVAL;
3750
3751                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
3752
3753                 mutex_lock(&the_lnet.ln_api_mutex);
3754                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
3755                 mutex_unlock(&the_lnet.ln_api_mutex);
3756                 return rc;
3757         }
3758
3759         case IOC_LIBCFS_GET_LOCAL_HSTATS: {
3760                 struct lnet_ioctl_local_ni_hstats *stats = arg;
3761
3762                 if (stats->hlni_hdr.ioc_len < sizeof(*stats))
3763                         return -EINVAL;
3764
3765                 mutex_lock(&the_lnet.ln_api_mutex);
3766                 rc = lnet_get_local_ni_hstats(stats);
3767                 mutex_unlock(&the_lnet.ln_api_mutex);
3768
3769                 return rc;
3770         }
3771
3772         case IOC_LIBCFS_GET_RECOVERY_QUEUE: {
3773                 struct lnet_ioctl_recovery_list *list = arg;
3774                 if (list->rlst_hdr.ioc_len < sizeof(*list))
3775                         return -EINVAL;
3776
3777                 mutex_lock(&the_lnet.ln_api_mutex);
3778                 if (list->rlst_type == LNET_HEALTH_TYPE_LOCAL_NI)
3779                         rc = lnet_get_local_ni_recovery_list(list);
3780                 else
3781                         rc = lnet_get_peer_ni_recovery_list(list);
3782                 mutex_unlock(&the_lnet.ln_api_mutex);
3783                 return rc;
3784         }
3785
3786         case IOC_LIBCFS_ADD_PEER_NI: {
3787                 struct lnet_ioctl_peer_cfg *cfg = arg;
3788
3789                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3790                         return -EINVAL;
3791
3792                 mutex_lock(&the_lnet.ln_api_mutex);
3793                 rc = lnet_add_peer_ni(cfg->prcfg_prim_nid,
3794                                       cfg->prcfg_cfg_nid,
3795                                       cfg->prcfg_mr);
3796                 mutex_unlock(&the_lnet.ln_api_mutex);
3797                 return rc;
3798         }
3799
3800         case IOC_LIBCFS_DEL_PEER_NI: {
3801                 struct lnet_ioctl_peer_cfg *cfg = arg;
3802
3803                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3804                         return -EINVAL;
3805
3806                 mutex_lock(&the_lnet.ln_api_mutex);
3807                 rc = lnet_del_peer_ni(cfg->prcfg_prim_nid,
3808                                       cfg->prcfg_cfg_nid);
3809                 mutex_unlock(&the_lnet.ln_api_mutex);
3810                 return rc;
3811         }
3812
3813         case IOC_LIBCFS_GET_PEER_INFO: {
3814                 struct lnet_ioctl_peer *peer_info = arg;
3815
3816                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
3817                         return -EINVAL;
3818
3819                 mutex_lock(&the_lnet.ln_api_mutex);
3820                 rc = lnet_get_peer_ni_info(
3821                    peer_info->pr_count,
3822                    &peer_info->pr_nid,
3823                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
3824                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
3825                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
3826                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
3827                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
3828                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
3829                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
3830                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
3831                 mutex_unlock(&the_lnet.ln_api_mutex);
3832                 return rc;
3833         }
3834
3835         case IOC_LIBCFS_GET_PEER_NI: {
3836                 struct lnet_ioctl_peer_cfg *cfg = arg;
3837
3838                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3839                         return -EINVAL;
3840
3841                 mutex_lock(&the_lnet.ln_api_mutex);
3842                 rc = lnet_get_peer_info(cfg,
3843                                         (void __user *)cfg->prcfg_bulk);
3844                 mutex_unlock(&the_lnet.ln_api_mutex);
3845                 return rc;
3846         }
3847
3848         case IOC_LIBCFS_GET_PEER_LIST: {
3849                 struct lnet_ioctl_peer_cfg *cfg = arg;
3850
3851                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3852                         return -EINVAL;
3853
3854                 mutex_lock(&the_lnet.ln_api_mutex);
3855                 rc = lnet_get_peer_list(&cfg->prcfg_count, &cfg->prcfg_size,
3856                                 (struct lnet_process_id __user *)cfg->prcfg_bulk);
3857                 mutex_unlock(&the_lnet.ln_api_mutex);
3858                 return rc;
3859         }
3860
3861         case IOC_LIBCFS_SET_HEALHV: {
3862                 struct lnet_ioctl_reset_health_cfg *cfg = arg;
3863                 int value;
3864                 if (cfg->rh_hdr.ioc_len < sizeof(*cfg))
3865                         return -EINVAL;
3866                 if (cfg->rh_value < 0 ||
3867                     cfg->rh_value > LNET_MAX_HEALTH_VALUE)
3868                         value = LNET_MAX_HEALTH_VALUE;
3869                 else
3870                         value = cfg->rh_value;
3871                 CDEBUG(D_NET, "Manually setting healthv to %d for %s:%s. all = %d\n",
3872                        value, (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI) ?
3873                        "local" : "peer", libcfs_nid2str(cfg->rh_nid), cfg->rh_all);
3874                 mutex_lock(&the_lnet.ln_api_mutex);
3875                 if (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI)
3876                         lnet_ni_set_healthv(cfg->rh_nid, value,
3877                                              cfg->rh_all);
3878                 else
3879                         lnet_peer_ni_set_healthv(cfg->rh_nid, value,
3880                                                   cfg->rh_all);
3881                 mutex_unlock(&the_lnet.ln_api_mutex);
3882                 return 0;
3883         }
3884
3885         case IOC_LIBCFS_NOTIFY_ROUTER: {
3886                 time64_t deadline = ktime_get_real_seconds() - data->ioc_u64[0];
3887
3888                 /* The deadline passed in by the user should be some time in
3889                  * seconds in the future since the UNIX epoch. We have to map
3890                  * that deadline to the wall clock.
3891                  */
3892                 deadline += ktime_get_seconds();
3893                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags, false,
3894                                    deadline);
3895         }
3896
3897         case IOC_LIBCFS_LNET_DIST:
3898                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
3899                 if (rc < 0 && rc != -EHOSTUNREACH)
3900                         return rc;
3901
3902                 data->ioc_u32[0] = rc;
3903                 return 0;
3904
3905         case IOC_LIBCFS_TESTPROTOCOMPAT:
3906                 the_lnet.ln_testprotocompat = data->ioc_flags;
3907                 return 0;
3908
3909         case IOC_LIBCFS_LNET_FAULT:
3910                 return lnet_fault_ctl(data->ioc_flags, data);
3911
3912         case IOC_LIBCFS_PING: {
3913                 signed long timeout;
3914
3915                 id.nid = data->ioc_nid;
3916                 id.pid = data->ioc_u32[0];
3917
3918                 /* If timeout is negative then set default of 3 minutes */
3919                 if (((s32)data->ioc_u32[1] <= 0) ||
3920                     data->ioc_u32[1] > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3921                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3922                 else
3923                         timeout = nsecs_to_jiffies(data->ioc_u32[1] * NSEC_PER_MSEC);
3924
3925                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
3926                                data->ioc_plen1 / sizeof(struct lnet_process_id));
3927
3928                 if (rc < 0)
3929                         return rc;
3930
3931                 data->ioc_count = rc;
3932                 return 0;
3933         }
3934
3935         case IOC_LIBCFS_PING_PEER: {
3936                 struct lnet_ioctl_ping_data *ping = arg;
3937                 struct lnet_peer *lp;
3938                 signed long timeout;
3939
3940                 /* If timeout is negative then set default of 3 minutes */
3941                 if (((s32)ping->op_param) <= 0 ||
3942                     ping->op_param > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3943                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3944                 else
3945                         timeout = nsecs_to_jiffies(ping->op_param * NSEC_PER_MSEC);
3946
3947                 rc = lnet_ping(ping->ping_id, timeout,
3948                                ping->ping_buf,
3949                                ping->ping_count);
3950                 if (rc < 0)
3951                         return rc;
3952
3953                 mutex_lock(&the_lnet.ln_api_mutex);
3954                 lp = lnet_find_peer(ping->ping_id.nid);
3955                 if (lp) {
3956                         ping->ping_id.nid = lp->lp_primary_nid;
3957                         ping->mr_info = lnet_peer_is_multi_rail(lp);
3958                         lnet_peer_decref_locked(lp);
3959                 }
3960                 mutex_unlock(&the_lnet.ln_api_mutex);
3961
3962                 ping->ping_count = rc;
3963                 return 0;
3964         }
3965
3966         case IOC_LIBCFS_DISCOVER: {
3967                 struct lnet_ioctl_ping_data *discover = arg;
3968                 struct lnet_peer *lp;
3969
3970                 rc = lnet_discover(discover->ping_id, discover->op_param,
3971                                    discover->ping_buf,
3972                                    discover->ping_count);
3973                 if (rc < 0)
3974                         return rc;
3975
3976                 mutex_lock(&the_lnet.ln_api_mutex);
3977                 lp = lnet_find_peer(discover->ping_id.nid);
3978                 if (lp) {
3979                         discover->ping_id.nid = lp->lp_primary_nid;
3980                         discover->mr_info = lnet_peer_is_multi_rail(lp);
3981                         lnet_peer_decref_locked(lp);
3982                 }
3983                 mutex_unlock(&the_lnet.ln_api_mutex);
3984
3985                 discover->ping_count = rc;
3986                 return 0;
3987         }
3988
3989         default:
3990                 ni = lnet_net2ni_addref(data->ioc_net);
3991                 if (ni == NULL)
3992                         return -EINVAL;
3993
3994                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
3995                         rc = -EINVAL;
3996                 else
3997                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
3998
3999                 lnet_ni_decref(ni);
4000                 return rc;
4001         }
4002         /* not reached */
4003 }
4004 EXPORT_SYMBOL(LNetCtl);
4005
4006 void LNetDebugPeer(struct lnet_process_id id)
4007 {
4008         lnet_debug_peer(id.nid);
4009 }
4010 EXPORT_SYMBOL(LNetDebugPeer);
4011
4012 /**
4013  * Determine if the specified peer \a nid is on the local node.
4014  *
4015  * \param nid   peer nid to check
4016  *
4017  * \retval true         If peer NID is on the local node.
4018  * \retval false        If peer NID is not on the local node.
4019  */
4020 bool LNetIsPeerLocal(lnet_nid_t nid)
4021 {
4022         struct lnet_net *net;
4023         struct lnet_ni *ni;
4024         int cpt;
4025
4026         cpt = lnet_net_lock_current();
4027         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4028                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4029                         if (ni->ni_nid == nid) {
4030                                 lnet_net_unlock(cpt);
4031                                 return true;
4032                         }
4033                 }
4034         }
4035         lnet_net_unlock(cpt);
4036
4037         return false;
4038 }
4039 EXPORT_SYMBOL(LNetIsPeerLocal);
4040
4041 /**
4042  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
4043  * Note that all interfaces share a same PID, as requested by LNetNIInit().
4044  *
4045  * \param index Index of the interface to look up.
4046  * \param id On successful return, this location will hold the
4047  * struct lnet_process_id ID of the interface.
4048  *
4049  * \retval 0 If an interface exists at \a index.
4050  * \retval -ENOENT If no interface has been found.
4051  */
4052 int
4053 LNetGetId(unsigned int index, struct lnet_process_id *id)
4054 {
4055         struct lnet_ni   *ni;
4056         struct lnet_net  *net;
4057         int               cpt;
4058         int               rc = -ENOENT;
4059
4060         LASSERT(the_lnet.ln_refcount > 0);
4061
4062         cpt = lnet_net_lock_current();
4063
4064         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4065                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4066                         if (index-- != 0)
4067                                 continue;
4068
4069                         id->nid = ni->ni_nid;
4070                         id->pid = the_lnet.ln_pid;
4071                         rc = 0;
4072                         break;
4073                 }
4074         }
4075
4076         lnet_net_unlock(cpt);
4077         return rc;
4078 }
4079 EXPORT_SYMBOL(LNetGetId);
4080
4081 struct ping_data {
4082         int rc;
4083         int replied;
4084         struct lnet_handle_md mdh;
4085         struct completion completion;
4086 };
4087
4088 static void
4089 lnet_ping_event_handler(struct lnet_event *event)
4090 {
4091         struct ping_data *pd = event->md.user_ptr;
4092
4093         CDEBUG(D_NET, "ping event (%d %d)%s\n",
4094                event->type, event->status,
4095                event->unlinked ? " unlinked" : "");
4096
4097         if (event->status) {
4098                 if (!pd->rc)
4099                         pd->rc = event->status;
4100         } else if (event->type == LNET_EVENT_REPLY) {
4101                 pd->replied = 1;
4102                 pd->rc = event->mlength;
4103         }
4104         if (event->unlinked)
4105                 complete(&pd->completion);
4106 }
4107
4108 static int lnet_ping(struct lnet_process_id id, signed long timeout,
4109                      struct lnet_process_id __user *ids, int n_ids)
4110 {
4111         struct lnet_eq *eq;
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         eq = LNetEQAlloc(lnet_ping_event_handler);
4140         if (IS_ERR(eq)) {
4141                 rc = PTR_ERR(eq);
4142                 CERROR("Can't allocate EQ: %d\n", rc);
4143                 goto fail_ping_buffer_decref;
4144         }
4145
4146         /* initialize md content */
4147         md.start     = &pbuf->pb_info;
4148         md.length    = LNET_PING_INFO_SIZE(n_ids);
4149         md.threshold = 2; /* GET/REPLY */
4150         md.max_size  = 0;
4151         md.options   = LNET_MD_TRUNCATE;
4152         md.user_ptr  = &pd;
4153         md.eq_handle = eq;
4154
4155         init_completion(&pd.completion);
4156
4157         rc = LNetMDBind(md, LNET_UNLINK, &pd.mdh);
4158         if (rc != 0) {
4159                 CERROR("Can't bind MD: %d\n", rc);
4160                 goto fail_free_eq;
4161         }
4162
4163         rc = LNetGet(LNET_NID_ANY, pd.mdh, id,
4164                      LNET_RESERVED_PORTAL,
4165                      LNET_PROTO_PING_MATCHBITS, 0, false);
4166
4167         if (rc != 0) {
4168                 /* Don't CERROR; this could be deliberate! */
4169                 rc2 = LNetMDUnlink(pd.mdh);
4170                 LASSERT(rc2 == 0);
4171
4172                 /* NB must wait for the UNLINK event below... */
4173         }
4174
4175         if (wait_for_completion_timeout(&pd.completion, timeout) == 0) {
4176                 /* Ensure completion in finite time... */
4177                 LNetMDUnlink(pd.mdh);
4178                 wait_for_completion(&pd.completion);
4179         }
4180         if (!pd.replied) {
4181                 rc = -EIO;
4182                 goto fail_free_eq;
4183         }
4184
4185         nob = pd.rc;
4186         LASSERT(nob >= 0 && nob <= LNET_PING_INFO_SIZE(n_ids));
4187
4188         rc = -EPROTO;           /* if I can't parse... */
4189
4190         if (nob < 8) {
4191                 CERROR("%s: ping info too short %d\n",
4192                        libcfs_id2str(id), nob);
4193                 goto fail_free_eq;
4194         }
4195
4196         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
4197                 lnet_swap_pinginfo(pbuf);
4198         } else if (pbuf->pb_info.pi_magic != LNET_PROTO_PING_MAGIC) {
4199                 CERROR("%s: Unexpected magic %08x\n",
4200                        libcfs_id2str(id), pbuf->pb_info.pi_magic);
4201                 goto fail_free_eq;
4202         }
4203
4204         if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
4205                 CERROR("%s: ping w/o NI status: 0x%x\n",
4206                        libcfs_id2str(id), pbuf->pb_info.pi_features);
4207                 goto fail_free_eq;
4208         }
4209
4210         if (nob < LNET_PING_INFO_SIZE(0)) {
4211                 CERROR("%s: Short reply %d(%d min)\n",
4212                        libcfs_id2str(id),
4213                        nob, (int)LNET_PING_INFO_SIZE(0));
4214                 goto fail_free_eq;
4215         }
4216
4217         if (pbuf->pb_info.pi_nnis < n_ids)
4218                 n_ids = pbuf->pb_info.pi_nnis;
4219
4220         if (nob < LNET_PING_INFO_SIZE(n_ids)) {
4221                 CERROR("%s: Short reply %d(%d expected)\n",
4222                        libcfs_id2str(id),
4223                        nob, (int)LNET_PING_INFO_SIZE(n_ids));
4224                 goto fail_free_eq;
4225         }
4226
4227         rc = -EFAULT;           /* if I segv in copy_to_user()... */
4228
4229         memset(&tmpid, 0, sizeof(tmpid));
4230         for (i = 0; i < n_ids; i++) {
4231                 tmpid.pid = pbuf->pb_info.pi_pid;
4232                 tmpid.nid = pbuf->pb_info.pi_ni[i].ns_nid;
4233                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
4234                         goto fail_free_eq;
4235         }
4236         rc = pbuf->pb_info.pi_nnis;
4237
4238  fail_free_eq:
4239         rc2 = LNetEQFree(eq);
4240         if (rc2 != 0)
4241                 CERROR("rc2 %d\n", rc2);
4242         LASSERT(rc2 == 0);
4243
4244  fail_ping_buffer_decref:
4245         lnet_ping_buffer_decref(pbuf);
4246         return rc;
4247 }
4248
4249 static int
4250 lnet_discover(struct lnet_process_id id, __u32 force,
4251               struct lnet_process_id __user *ids, int n_ids)
4252 {
4253         struct lnet_peer_ni *lpni;
4254         struct lnet_peer_ni *p;
4255         struct lnet_peer *lp;
4256         struct lnet_process_id *buf;
4257         int cpt;
4258         int i;
4259         int rc;
4260         int max_intf = lnet_interfaces_max;
4261
4262         if (n_ids <= 0 ||
4263             id.nid == LNET_NID_ANY)
4264                 return -EINVAL;
4265
4266         if (id.pid == LNET_PID_ANY)
4267                 id.pid = LNET_PID_LUSTRE;
4268
4269         /*
4270          * if the user buffer has more space than the max_intf
4271          * then only fill it up to max_intf
4272          */
4273         if (n_ids > max_intf)
4274                 n_ids = max_intf;
4275
4276         CFS_ALLOC_PTR_ARRAY(buf, n_ids);
4277         if (!buf)
4278                 return -ENOMEM;
4279
4280         cpt = lnet_net_lock_current();
4281         lpni = lnet_nid2peerni_locked(id.nid, LNET_NID_ANY, cpt);
4282         if (IS_ERR(lpni)) {
4283                 rc = PTR_ERR(lpni);
4284                 goto out;
4285         }
4286
4287         /*
4288          * Clearing the NIDS_UPTODATE flag ensures the peer will
4289          * be discovered, provided discovery has not been disabled.
4290          */
4291         lp = lpni->lpni_peer_net->lpn_peer;
4292         spin_lock(&lp->lp_lock);
4293         lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
4294         /* If the force flag is set, force a PING and PUSH as well. */
4295         if (force)
4296                 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
4297         spin_unlock(&lp->lp_lock);
4298         rc = lnet_discover_peer_locked(lpni, cpt, true);
4299         if (rc)
4300                 goto out_decref;
4301
4302         /* Peer may have changed. */
4303         lp = lpni->lpni_peer_net->lpn_peer;
4304         if (lp->lp_nnis < n_ids)
4305                 n_ids = lp->lp_nnis;
4306
4307         i = 0;
4308         p = NULL;
4309         while ((p = lnet_get_next_peer_ni_locked(lp, NULL, p)) != NULL) {
4310                 buf[i].pid = id.pid;
4311                 buf[i].nid = p->lpni_nid;
4312                 if (++i >= n_ids)
4313                         break;
4314         }
4315
4316         lnet_net_unlock(cpt);
4317
4318         rc = -EFAULT;
4319         if (copy_to_user(ids, buf, n_ids * sizeof(*buf)))
4320                 goto out_relock;
4321         rc = n_ids;
4322 out_relock:
4323         lnet_net_lock(cpt);
4324 out_decref:
4325         lnet_peer_ni_decref_locked(lpni);
4326 out:
4327         lnet_net_unlock(cpt);
4328
4329         CFS_FREE_PTR_ARRAY(buf, n_ids);
4330
4331         return rc;
4332 }
4333
4334 /**
4335  * Retrieve peer discovery status.
4336  *
4337  * \retval 1 if lnet_peer_discovery_disabled is 0
4338  * \retval 0 if lnet_peer_discovery_disabled is 1
4339  */
4340 int
4341 LNetGetPeerDiscoveryStatus(void)
4342 {
4343         return !lnet_peer_discovery_disabled;
4344 }
4345 EXPORT_SYMBOL(LNetGetPeerDiscoveryStatus);