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                 pbuf->pb_needs_post = false;
1505                 atomic_set(&pbuf->pb_refcnt, 1);
1506         }
1507
1508         return pbuf;
1509 }
1510
1511 void
1512 lnet_ping_buffer_free(struct lnet_ping_buffer *pbuf)
1513 {
1514         LASSERT(atomic_read(&pbuf->pb_refcnt) == 0);
1515         LIBCFS_FREE(pbuf, LNET_PING_BUFFER_SIZE(pbuf->pb_nnis));
1516 }
1517
1518 static struct lnet_ping_buffer *
1519 lnet_ping_target_create(int nnis)
1520 {
1521         struct lnet_ping_buffer *pbuf;
1522
1523         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1524         if (pbuf == NULL) {
1525                 CERROR("Can't allocate ping source [%d]\n", nnis);
1526                 return NULL;
1527         }
1528
1529         pbuf->pb_info.pi_nnis = nnis;
1530         pbuf->pb_info.pi_pid = the_lnet.ln_pid;
1531         pbuf->pb_info.pi_magic = LNET_PROTO_PING_MAGIC;
1532         pbuf->pb_info.pi_features =
1533                 LNET_PING_FEAT_NI_STATUS | LNET_PING_FEAT_MULTI_RAIL;
1534
1535         return pbuf;
1536 }
1537
1538 static inline int
1539 lnet_get_net_ni_count_locked(struct lnet_net *net)
1540 {
1541         struct lnet_ni  *ni;
1542         int             count = 0;
1543
1544         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1545                 count++;
1546
1547         return count;
1548 }
1549
1550 static inline int
1551 lnet_get_net_ni_count_pre(struct lnet_net *net)
1552 {
1553         struct lnet_ni  *ni;
1554         int             count = 0;
1555
1556         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
1557                 count++;
1558
1559         return count;
1560 }
1561
1562 static inline int
1563 lnet_get_ni_count(void)
1564 {
1565         struct lnet_ni  *ni;
1566         struct lnet_net *net;
1567         int             count = 0;
1568
1569         lnet_net_lock(0);
1570
1571         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1572                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1573                         count++;
1574         }
1575
1576         lnet_net_unlock(0);
1577
1578         return count;
1579 }
1580
1581 int
1582 lnet_get_net_count(void)
1583 {
1584         struct lnet_net *net;
1585         int count = 0;
1586
1587         lnet_net_lock(0);
1588
1589         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1590                 count++;
1591         }
1592
1593         lnet_net_unlock(0);
1594
1595         return count;
1596 }
1597
1598 void
1599 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
1600 {
1601         struct lnet_ni_status *stat;
1602         int nnis;
1603         int i;
1604
1605         __swab32s(&pbuf->pb_info.pi_magic);
1606         __swab32s(&pbuf->pb_info.pi_features);
1607         __swab32s(&pbuf->pb_info.pi_pid);
1608         __swab32s(&pbuf->pb_info.pi_nnis);
1609         nnis = pbuf->pb_info.pi_nnis;
1610         if (nnis > pbuf->pb_nnis)
1611                 nnis = pbuf->pb_nnis;
1612         for (i = 0; i < nnis; i++) {
1613                 stat = &pbuf->pb_info.pi_ni[i];
1614                 __swab64s(&stat->ns_nid);
1615                 __swab32s(&stat->ns_status);
1616         }
1617 }
1618
1619 int
1620 lnet_ping_info_validate(struct lnet_ping_info *pinfo)
1621 {
1622         if (!pinfo)
1623                 return -EINVAL;
1624         if (pinfo->pi_magic != LNET_PROTO_PING_MAGIC)
1625                 return -EPROTO;
1626         if (!(pinfo->pi_features & LNET_PING_FEAT_NI_STATUS))
1627                 return -EPROTO;
1628         /* Loopback is guaranteed to be present */
1629         if (pinfo->pi_nnis < 1 || pinfo->pi_nnis > lnet_interfaces_max)
1630                 return -ERANGE;
1631         if (LNET_NETTYP(LNET_NIDNET(LNET_PING_INFO_LONI(pinfo))) != LOLND)
1632                 return -EPROTO;
1633         return 0;
1634 }
1635
1636 static void
1637 lnet_ping_target_destroy(void)
1638 {
1639         struct lnet_net *net;
1640         struct lnet_ni  *ni;
1641
1642         lnet_net_lock(LNET_LOCK_EX);
1643
1644         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1645                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1646                         lnet_ni_lock(ni);
1647                         ni->ni_status = NULL;
1648                         lnet_ni_unlock(ni);
1649                 }
1650         }
1651
1652         lnet_ping_buffer_decref(the_lnet.ln_ping_target);
1653         the_lnet.ln_ping_target = NULL;
1654
1655         lnet_net_unlock(LNET_LOCK_EX);
1656 }
1657
1658 static void
1659 lnet_ping_target_event_handler(struct lnet_event *event)
1660 {
1661         struct lnet_ping_buffer *pbuf = event->md.user_ptr;
1662
1663         if (event->unlinked)
1664                 lnet_ping_buffer_decref(pbuf);
1665 }
1666
1667 static int
1668 lnet_ping_target_setup(struct lnet_ping_buffer **ppbuf,
1669                        struct lnet_handle_md *ping_mdh,
1670                        int ni_count, bool set_eq)
1671 {
1672         struct lnet_process_id id = {
1673                 .nid = LNET_NID_ANY,
1674                 .pid = LNET_PID_ANY
1675         };
1676         struct lnet_me *me;
1677         struct lnet_md md = { NULL };
1678         int rc, rc2;
1679
1680         if (set_eq) {
1681                 the_lnet.ln_ping_target_eq =
1682                         LNetEQAlloc(lnet_ping_target_event_handler);
1683                 if (IS_ERR(the_lnet.ln_ping_target_eq)) {
1684                         rc = PTR_ERR(the_lnet.ln_ping_target_eq);
1685                         CERROR("Can't allocate ping buffer EQ: %d\n", rc);
1686                         return rc;
1687                 }
1688         }
1689
1690         *ppbuf = lnet_ping_target_create(ni_count);
1691         if (*ppbuf == NULL) {
1692                 rc = -ENOMEM;
1693                 goto fail_free_eq;
1694         }
1695
1696         /* Ping target ME/MD */
1697         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1698                           LNET_PROTO_PING_MATCHBITS, 0,
1699                           LNET_UNLINK, LNET_INS_AFTER);
1700         if (IS_ERR(me)) {
1701                 rc = PTR_ERR(me);
1702                 CERROR("Can't create ping target ME: %d\n", rc);
1703                 goto fail_decref_ping_buffer;
1704         }
1705
1706         /* initialize md content */
1707         md.start     = &(*ppbuf)->pb_info;
1708         md.length    = LNET_PING_INFO_SIZE((*ppbuf)->pb_nnis);
1709         md.threshold = LNET_MD_THRESH_INF;
1710         md.max_size  = 0;
1711         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1712                        LNET_MD_MANAGE_REMOTE;
1713         md.eq_handle = the_lnet.ln_ping_target_eq;
1714         md.user_ptr  = *ppbuf;
1715
1716         rc = LNetMDAttach(me, md, LNET_RETAIN, ping_mdh);
1717         if (rc != 0) {
1718                 CERROR("Can't attach ping target MD: %d\n", rc);
1719                 goto fail_unlink_ping_me;
1720         }
1721         lnet_ping_buffer_addref(*ppbuf);
1722
1723         return 0;
1724
1725 fail_unlink_ping_me:
1726         LNetMEUnlink(me);
1727 fail_decref_ping_buffer:
1728         LASSERT(atomic_read(&(*ppbuf)->pb_refcnt) == 1);
1729         lnet_ping_buffer_decref(*ppbuf);
1730         *ppbuf = NULL;
1731 fail_free_eq:
1732         if (set_eq) {
1733                 rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1734                 LASSERT(rc2 == 0);
1735         }
1736         return rc;
1737 }
1738
1739 static void
1740 lnet_ping_md_unlink(struct lnet_ping_buffer *pbuf,
1741                     struct lnet_handle_md *ping_mdh)
1742 {
1743         LNetMDUnlink(*ping_mdh);
1744         LNetInvalidateMDHandle(ping_mdh);
1745
1746         /* NB the MD could be busy; this just starts the unlink */
1747         while (atomic_read(&pbuf->pb_refcnt) > 1) {
1748                 CDEBUG(D_NET, "Still waiting for ping data MD to unlink\n");
1749                 schedule_timeout_uninterruptible(cfs_time_seconds(1));
1750         }
1751 }
1752
1753 static void
1754 lnet_ping_target_install_locked(struct lnet_ping_buffer *pbuf)
1755 {
1756         struct lnet_ni          *ni;
1757         struct lnet_net         *net;
1758         struct lnet_ni_status *ns;
1759         int                     i;
1760         int                     rc;
1761
1762         i = 0;
1763         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1764                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1765                         LASSERT(i < pbuf->pb_nnis);
1766
1767                         ns = &pbuf->pb_info.pi_ni[i];
1768
1769                         ns->ns_nid = ni->ni_nid;
1770
1771                         lnet_ni_lock(ni);
1772                         ns->ns_status = (ni->ni_status != NULL) ?
1773                                          ni->ni_status->ns_status :
1774                                                 LNET_NI_STATUS_UP;
1775                         ni->ni_status = ns;
1776                         lnet_ni_unlock(ni);
1777
1778                         i++;
1779                 }
1780         }
1781         /*
1782          * We (ab)use the ns_status of the loopback interface to
1783          * transmit the sequence number. The first interface listed
1784          * must be the loopback interface.
1785          */
1786         rc = lnet_ping_info_validate(&pbuf->pb_info);
1787         if (rc) {
1788                 LCONSOLE_EMERG("Invalid ping target: %d\n", rc);
1789                 LBUG();
1790         }
1791         LNET_PING_BUFFER_SEQNO(pbuf) =
1792                 atomic_inc_return(&the_lnet.ln_ping_target_seqno);
1793 }
1794
1795 static void
1796 lnet_ping_target_update(struct lnet_ping_buffer *pbuf,
1797                         struct lnet_handle_md ping_mdh)
1798 {
1799         struct lnet_ping_buffer *old_pbuf = NULL;
1800         struct lnet_handle_md old_ping_md;
1801
1802         /* switch the NIs to point to the new ping info created */
1803         lnet_net_lock(LNET_LOCK_EX);
1804
1805         if (!the_lnet.ln_routing)
1806                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1807         if (!lnet_peer_discovery_disabled)
1808                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
1809
1810         /* Ensure only known feature bits have been set. */
1811         LASSERT(pbuf->pb_info.pi_features & LNET_PING_FEAT_BITS);
1812         LASSERT(!(pbuf->pb_info.pi_features & ~LNET_PING_FEAT_BITS));
1813
1814         lnet_ping_target_install_locked(pbuf);
1815
1816         if (the_lnet.ln_ping_target) {
1817                 old_pbuf = the_lnet.ln_ping_target;
1818                 old_ping_md = the_lnet.ln_ping_target_md;
1819         }
1820         the_lnet.ln_ping_target_md = ping_mdh;
1821         the_lnet.ln_ping_target = pbuf;
1822
1823         lnet_net_unlock(LNET_LOCK_EX);
1824
1825         if (old_pbuf) {
1826                 /* unlink and free the old ping info */
1827                 lnet_ping_md_unlink(old_pbuf, &old_ping_md);
1828                 lnet_ping_buffer_decref(old_pbuf);
1829         }
1830
1831         lnet_push_update_to_peers(0);
1832 }
1833
1834 static void
1835 lnet_ping_target_fini(void)
1836 {
1837         int             rc;
1838
1839         lnet_ping_md_unlink(the_lnet.ln_ping_target,
1840                             &the_lnet.ln_ping_target_md);
1841
1842         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1843         LASSERT(rc == 0);
1844
1845         lnet_ping_target_destroy();
1846 }
1847
1848 /* Resize the push target. */
1849 int lnet_push_target_resize(void)
1850 {
1851         struct lnet_handle_md mdh;
1852         struct lnet_handle_md old_mdh;
1853         struct lnet_ping_buffer *pbuf;
1854         struct lnet_ping_buffer *old_pbuf;
1855         int nnis;
1856         int rc;
1857
1858 again:
1859         nnis = the_lnet.ln_push_target_nnis;
1860         if (nnis <= 0) {
1861                 CDEBUG(D_NET, "Invalid nnis %d\n", nnis);
1862                 return -EINVAL;
1863         }
1864
1865         /* NB: lnet_ping_buffer_alloc() sets pbuf refcount to 1. That ref is
1866          * dropped when we need to resize again (see "old_pbuf" below) or when
1867          * LNet is shutdown (see lnet_push_target_fini())
1868          */
1869         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1870         if (!pbuf) {
1871                 CDEBUG(D_NET, "Can't allocate pbuf for nnis %d\n", nnis);
1872                 return -ENOMEM;
1873         }
1874
1875         rc = lnet_push_target_post(pbuf, &mdh);
1876         if (rc) {
1877                 CDEBUG(D_NET, "Failed to post push target: %d\n", rc);
1878                 lnet_ping_buffer_decref(pbuf);
1879                 return rc;
1880         }
1881
1882         lnet_net_lock(LNET_LOCK_EX);
1883         old_pbuf = the_lnet.ln_push_target;
1884         old_mdh = the_lnet.ln_push_target_md;
1885         the_lnet.ln_push_target = pbuf;
1886         the_lnet.ln_push_target_md = mdh;
1887         lnet_net_unlock(LNET_LOCK_EX);
1888
1889         if (old_pbuf) {
1890                 LNetMDUnlink(old_mdh);
1891                 /* Drop ref set by lnet_ping_buffer_alloc() */
1892                 lnet_ping_buffer_decref(old_pbuf);
1893         }
1894
1895         /* Received another push or reply that requires a larger buffer */
1896         if (nnis < the_lnet.ln_push_target_nnis)
1897                 goto again;
1898
1899         CDEBUG(D_NET, "nnis %d success\n", nnis);
1900         return 0;
1901 }
1902
1903 int lnet_push_target_post(struct lnet_ping_buffer *pbuf,
1904                           struct lnet_handle_md *mdhp)
1905 {
1906         struct lnet_process_id id = { LNET_NID_ANY, LNET_PID_ANY };
1907         struct lnet_md md = { NULL };
1908         struct lnet_me *me;
1909         int rc;
1910
1911         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1912                           LNET_PROTO_PING_MATCHBITS, 0,
1913                           LNET_UNLINK, LNET_INS_AFTER);
1914         if (IS_ERR(me)) {
1915                 rc = PTR_ERR(me);
1916                 CERROR("Can't create push target ME: %d\n", rc);
1917                 return rc;
1918         }
1919
1920         pbuf->pb_needs_post = false;
1921
1922         /* This reference is dropped by lnet_push_target_event_handler() */
1923         lnet_ping_buffer_addref(pbuf);
1924
1925         /* initialize md content */
1926         md.start     = &pbuf->pb_info;
1927         md.length    = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
1928         md.threshold = 1;
1929         md.max_size  = 0;
1930         md.options   = LNET_MD_OP_PUT | LNET_MD_TRUNCATE;
1931         md.user_ptr  = pbuf;
1932         md.eq_handle = the_lnet.ln_push_target_eq;
1933
1934         rc = LNetMDAttach(me, md, LNET_UNLINK, mdhp);
1935         if (rc) {
1936                 CERROR("Can't attach push MD: %d\n", rc);
1937                 LNetMEUnlink(me);
1938                 lnet_ping_buffer_decref(pbuf);
1939                 pbuf->pb_needs_post = true;
1940                 return rc;
1941         }
1942
1943         CDEBUG(D_NET, "posted push target %p\n", pbuf);
1944
1945         return 0;
1946 }
1947
1948 static void lnet_push_target_event_handler(struct lnet_event *ev)
1949 {
1950         struct lnet_ping_buffer *pbuf = ev->md.user_ptr;
1951
1952         CDEBUG(D_NET, "type %d status %d unlinked %d\n", ev->type, ev->status,
1953                ev->unlinked);
1954
1955         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
1956                 lnet_swap_pinginfo(pbuf);
1957
1958         if (ev->type == LNET_EVENT_UNLINK) {
1959                 /* Drop ref added by lnet_push_target_post() */
1960                 lnet_ping_buffer_decref(pbuf);
1961                 return;
1962         }
1963
1964         lnet_peer_push_event(ev);
1965         if (ev->unlinked)
1966                 /* Drop ref added by lnet_push_target_post */
1967                 lnet_ping_buffer_decref(pbuf);
1968 }
1969
1970 /* Initialize the push target. */
1971 static int lnet_push_target_init(void)
1972 {
1973         int rc;
1974
1975         if (the_lnet.ln_push_target)
1976                 return -EALREADY;
1977
1978         the_lnet.ln_push_target_eq =
1979                 LNetEQAlloc(lnet_push_target_event_handler);
1980         if (IS_ERR(the_lnet.ln_push_target_eq)) {
1981                 rc = PTR_ERR(the_lnet.ln_push_target_eq);
1982                 CERROR("Can't allocated push target EQ: %d\n", rc);
1983                 return rc;
1984         }
1985
1986         rc = LNetSetLazyPortal(LNET_RESERVED_PORTAL);
1987         LASSERT(rc == 0);
1988
1989         /* Start at the required minimum, we'll enlarge if required. */
1990         the_lnet.ln_push_target_nnis = LNET_INTERFACES_MIN;
1991
1992         rc = lnet_push_target_resize();
1993
1994         if (rc) {
1995                 LNetClearLazyPortal(LNET_RESERVED_PORTAL);
1996                 LNetEQFree(the_lnet.ln_push_target_eq);
1997                 the_lnet.ln_push_target_eq = NULL;
1998         }
1999
2000         return rc;
2001 }
2002
2003 /* Clean up the push target. */
2004 static void lnet_push_target_fini(void)
2005 {
2006         if (!the_lnet.ln_push_target)
2007                 return;
2008
2009         /* Unlink and invalidate to prevent new references. */
2010         LNetMDUnlink(the_lnet.ln_push_target_md);
2011         LNetInvalidateMDHandle(&the_lnet.ln_push_target_md);
2012
2013         /* Wait for the unlink to complete. */
2014         while (atomic_read(&the_lnet.ln_push_target->pb_refcnt) > 1) {
2015                 CDEBUG(D_NET, "Still waiting for ping data MD to unlink\n");
2016                 schedule_timeout_uninterruptible(cfs_time_seconds(1));
2017         }
2018
2019         /* Drop ref set by lnet_ping_buffer_alloc() */
2020         lnet_ping_buffer_decref(the_lnet.ln_push_target);
2021         the_lnet.ln_push_target = NULL;
2022         the_lnet.ln_push_target_nnis = 0;
2023
2024         LNetClearLazyPortal(LNET_RESERVED_PORTAL);
2025         LNetEQFree(the_lnet.ln_push_target_eq);
2026         the_lnet.ln_push_target_eq = NULL;
2027 }
2028
2029 static int
2030 lnet_ni_tq_credits(struct lnet_ni *ni)
2031 {
2032         int     credits;
2033
2034         LASSERT(ni->ni_ncpts >= 1);
2035
2036         if (ni->ni_ncpts == 1)
2037                 return ni->ni_net->net_tunables.lct_max_tx_credits;
2038
2039         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
2040         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
2041         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
2042
2043         return credits;
2044 }
2045
2046 static void
2047 lnet_ni_unlink_locked(struct lnet_ni *ni)
2048 {
2049         /* move it to zombie list and nobody can find it anymore */
2050         LASSERT(!list_empty(&ni->ni_netlist));
2051         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
2052         lnet_ni_decref_locked(ni, 0);
2053 }
2054
2055 static void
2056 lnet_clear_zombies_nis_locked(struct lnet_net *net)
2057 {
2058         int             i;
2059         int             islo;
2060         struct lnet_ni  *ni;
2061         struct list_head *zombie_list = &net->net_ni_zombie;
2062
2063         /*
2064          * Now wait for the NIs I just nuked to show up on the zombie
2065          * list and shut them down in guaranteed thread context
2066          */
2067         i = 2;
2068         while (!list_empty(zombie_list)) {
2069                 int     *ref;
2070                 int     j;
2071
2072                 ni = list_entry(zombie_list->next,
2073                                 struct lnet_ni, ni_netlist);
2074                 list_del_init(&ni->ni_netlist);
2075                 /* the ni should be in deleting state. If it's not it's
2076                  * a bug */
2077                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
2078                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
2079                         if (*ref == 0)
2080                                 continue;
2081                         /* still busy, add it back to zombie list */
2082                         list_add(&ni->ni_netlist, zombie_list);
2083                         break;
2084                 }
2085
2086                 if (!list_empty(&ni->ni_netlist)) {
2087                         lnet_net_unlock(LNET_LOCK_EX);
2088                         ++i;
2089                         if ((i & (-i)) == i) {
2090                                 CDEBUG(D_WARNING,
2091                                        "Waiting for zombie LNI %s\n",
2092                                        libcfs_nid2str(ni->ni_nid));
2093                         }
2094                         schedule_timeout_uninterruptible(cfs_time_seconds(1));
2095                         lnet_net_lock(LNET_LOCK_EX);
2096                         continue;
2097                 }
2098
2099                 lnet_net_unlock(LNET_LOCK_EX);
2100
2101                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
2102
2103                 LASSERT(!in_interrupt());
2104                 /* Holding the mutex makes it safe for lnd_shutdown
2105                  * to call module_put(). Module unload cannot finish
2106                  * until lnet_unregister_lnd() completes, and that
2107                  * requires the mutex.
2108                  */
2109                 mutex_lock(&the_lnet.ln_lnd_mutex);
2110                 (net->net_lnd->lnd_shutdown)(ni);
2111                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2112
2113                 if (!islo)
2114                         CDEBUG(D_LNI, "Removed LNI %s\n",
2115                               libcfs_nid2str(ni->ni_nid));
2116
2117                 lnet_ni_free(ni);
2118                 i = 2;
2119                 lnet_net_lock(LNET_LOCK_EX);
2120         }
2121 }
2122
2123 /* shutdown down the NI and release refcount */
2124 static void
2125 lnet_shutdown_lndni(struct lnet_ni *ni)
2126 {
2127         int i;
2128         struct lnet_net *net = ni->ni_net;
2129
2130         lnet_net_lock(LNET_LOCK_EX);
2131         lnet_ni_lock(ni);
2132         ni->ni_state = LNET_NI_STATE_DELETING;
2133         lnet_ni_unlock(ni);
2134         lnet_ni_unlink_locked(ni);
2135         lnet_incr_dlc_seq();
2136         lnet_net_unlock(LNET_LOCK_EX);
2137
2138         /* clear messages for this NI on the lazy portal */
2139         for (i = 0; i < the_lnet.ln_nportals; i++)
2140                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
2141
2142         lnet_net_lock(LNET_LOCK_EX);
2143         lnet_clear_zombies_nis_locked(net);
2144         lnet_net_unlock(LNET_LOCK_EX);
2145 }
2146
2147 static void
2148 lnet_shutdown_lndnet(struct lnet_net *net)
2149 {
2150         struct lnet_ni *ni;
2151
2152         lnet_net_lock(LNET_LOCK_EX);
2153
2154         list_del_init(&net->net_list);
2155
2156         while (!list_empty(&net->net_ni_list)) {
2157                 ni = list_entry(net->net_ni_list.next,
2158                                 struct lnet_ni, ni_netlist);
2159                 lnet_net_unlock(LNET_LOCK_EX);
2160                 lnet_shutdown_lndni(ni);
2161                 lnet_net_lock(LNET_LOCK_EX);
2162         }
2163
2164         lnet_net_unlock(LNET_LOCK_EX);
2165
2166         /* Do peer table cleanup for this net */
2167         lnet_peer_tables_cleanup(net);
2168
2169         lnet_net_free(net);
2170 }
2171
2172 static void
2173 lnet_shutdown_lndnets(void)
2174 {
2175         struct lnet_net *net;
2176         LIST_HEAD(resend);
2177         struct lnet_msg *msg, *tmp;
2178
2179         /* NB called holding the global mutex */
2180
2181         /* All quiet on the API front */
2182         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
2183         LASSERT(the_lnet.ln_refcount == 0);
2184
2185         lnet_net_lock(LNET_LOCK_EX);
2186         the_lnet.ln_state = LNET_STATE_STOPPING;
2187
2188         /*
2189          * move the nets to the zombie list to avoid them being
2190          * picked up for new work. LONET is also included in the
2191          * Nets that will be moved to the zombie list
2192          */
2193         list_splice_init(&the_lnet.ln_nets, &the_lnet.ln_net_zombie);
2194
2195         /* Drop the cached loopback Net. */
2196         if (the_lnet.ln_loni != NULL) {
2197                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
2198                 the_lnet.ln_loni = NULL;
2199         }
2200         lnet_net_unlock(LNET_LOCK_EX);
2201
2202         /* iterate through the net zombie list and delete each net */
2203         while (!list_empty(&the_lnet.ln_net_zombie)) {
2204                 net = list_entry(the_lnet.ln_net_zombie.next,
2205                                  struct lnet_net, net_list);
2206                 lnet_shutdown_lndnet(net);
2207         }
2208
2209         spin_lock(&the_lnet.ln_msg_resend_lock);
2210         list_splice(&the_lnet.ln_msg_resend, &resend);
2211         spin_unlock(&the_lnet.ln_msg_resend_lock);
2212
2213         list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
2214                 list_del_init(&msg->msg_list);
2215                 msg->msg_no_resend = true;
2216                 lnet_finalize(msg, -ECANCELED);
2217         }
2218
2219         lnet_net_lock(LNET_LOCK_EX);
2220         the_lnet.ln_state = LNET_STATE_SHUTDOWN;
2221         lnet_net_unlock(LNET_LOCK_EX);
2222 }
2223
2224 static int
2225 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
2226 {
2227         int                     rc = -EINVAL;
2228         struct lnet_tx_queue    *tq;
2229         int                     i;
2230         struct lnet_net         *net = ni->ni_net;
2231
2232         mutex_lock(&the_lnet.ln_lnd_mutex);
2233
2234         if (tun) {
2235                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
2236                 ni->ni_lnd_tunables_set = true;
2237         }
2238
2239         rc = (net->net_lnd->lnd_startup)(ni);
2240
2241         mutex_unlock(&the_lnet.ln_lnd_mutex);
2242
2243         if (rc != 0) {
2244                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
2245                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
2246                 goto failed0;
2247         }
2248
2249         lnet_ni_lock(ni);
2250         ni->ni_state = LNET_NI_STATE_ACTIVE;
2251         lnet_ni_unlock(ni);
2252
2253         /* We keep a reference on the loopback net through the loopback NI */
2254         if (net->net_lnd->lnd_type == LOLND) {
2255                 lnet_ni_addref(ni);
2256                 LASSERT(the_lnet.ln_loni == NULL);
2257                 the_lnet.ln_loni = ni;
2258                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
2259                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
2260                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
2261                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
2262                 return 0;
2263         }
2264
2265         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
2266             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
2267                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
2268                                    libcfs_lnd2str(net->net_lnd->lnd_type),
2269                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
2270                                         "" : "per-peer ");
2271                 /* shutdown the NI since if we get here then it must've already
2272                  * been started
2273                  */
2274                 lnet_shutdown_lndni(ni);
2275                 return -EINVAL;
2276         }
2277
2278         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
2279                 tq->tq_credits_min =
2280                 tq->tq_credits_max =
2281                 tq->tq_credits = lnet_ni_tq_credits(ni);
2282         }
2283
2284         atomic_set(&ni->ni_tx_credits,
2285                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
2286         atomic_set(&ni->ni_healthv, LNET_MAX_HEALTH_VALUE);
2287
2288         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
2289                 libcfs_nid2str(ni->ni_nid),
2290                 ni->ni_net->net_tunables.lct_peer_tx_credits,
2291                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
2292                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
2293                 ni->ni_net->net_tunables.lct_peer_timeout);
2294
2295         return 0;
2296 failed0:
2297         lnet_ni_free(ni);
2298         return rc;
2299 }
2300
2301 static int
2302 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
2303 {
2304         struct lnet_ni *ni;
2305         struct lnet_net *net_l = NULL;
2306         LIST_HEAD(local_ni_list);
2307         int rc;
2308         int ni_count = 0;
2309         __u32 lnd_type;
2310         const struct lnet_lnd  *lnd;
2311         int peer_timeout =
2312                 net->net_tunables.lct_peer_timeout;
2313         int maxtxcredits =
2314                 net->net_tunables.lct_max_tx_credits;
2315         int peerrtrcredits =
2316                 net->net_tunables.lct_peer_rtr_credits;
2317
2318         /*
2319          * make sure that this net is unique. If it isn't then
2320          * we are adding interfaces to an already existing network, and
2321          * 'net' is just a convenient way to pass in the list.
2322          * if it is unique we need to find the LND and load it if
2323          * necessary.
2324          */
2325         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
2326                 lnd_type = LNET_NETTYP(net->net_id);
2327
2328                 mutex_lock(&the_lnet.ln_lnd_mutex);
2329                 lnd = lnet_find_lnd_by_type(lnd_type);
2330
2331                 if (lnd == NULL) {
2332                         mutex_unlock(&the_lnet.ln_lnd_mutex);
2333                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
2334                         mutex_lock(&the_lnet.ln_lnd_mutex);
2335
2336                         lnd = lnet_find_lnd_by_type(lnd_type);
2337                         if (lnd == NULL) {
2338                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2339                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
2340                                 libcfs_lnd2str(lnd_type),
2341                                 libcfs_lnd2modname(lnd_type), rc);
2342 #ifndef HAVE_MODULE_LOADING_SUPPORT
2343                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
2344                                                 "compiled with kernel module "
2345                                                 "loading support.");
2346 #endif
2347                                 rc = -EINVAL;
2348                                 goto failed0;
2349                         }
2350                 }
2351
2352                 net->net_lnd = lnd;
2353
2354                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2355
2356                 net_l = net;
2357         }
2358
2359         /*
2360          * net_l: if the network being added is unique then net_l
2361          *        will point to that network
2362          *        if the network being added is not unique then
2363          *        net_l points to the existing network.
2364          *
2365          * When we enter the loop below, we'll pick NIs off he
2366          * network beign added and start them up, then add them to
2367          * a local ni list. Once we've successfully started all
2368          * the NIs then we join the local NI list (of started up
2369          * networks) with the net_l->net_ni_list, which should
2370          * point to the correct network to add the new ni list to
2371          *
2372          * If any of the new NIs fail to start up, then we want to
2373          * iterate through the local ni list, which should include
2374          * any NIs which were successfully started up, and shut
2375          * them down.
2376          *
2377          * After than we want to delete the network being added,
2378          * to avoid a memory leak.
2379          */
2380
2381         /*
2382          * When a network uses TCP bonding then all its interfaces
2383          * must be specified when the network is first defined: the
2384          * TCP bonding code doesn't allow for interfaces to be added
2385          * or removed.
2386          */
2387         if (net_l != net && net_l != NULL && use_tcp_bonding &&
2388             LNET_NETTYP(net_l->net_id) == SOCKLND) {
2389                 rc = -EINVAL;
2390                 goto failed0;
2391         }
2392
2393         while (!list_empty(&net->net_ni_added)) {
2394                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
2395                                 ni_netlist);
2396                 list_del_init(&ni->ni_netlist);
2397
2398                 /* make sure that the the NI we're about to start
2399                  * up is actually unique. if it's not fail. */
2400                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
2401                                         ni->ni_interfaces[0])) {
2402                         rc = -EEXIST;
2403                         goto failed1;
2404                 }
2405
2406                 /* adjust the pointer the parent network, just in case it
2407                  * the net is a duplicate */
2408                 ni->ni_net = net_l;
2409
2410                 rc = lnet_startup_lndni(ni, tun);
2411
2412                 if (rc < 0)
2413                         goto failed1;
2414
2415                 lnet_ni_addref(ni);
2416                 list_add_tail(&ni->ni_netlist, &local_ni_list);
2417
2418                 ni_count++;
2419         }
2420
2421         lnet_net_lock(LNET_LOCK_EX);
2422         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
2423         lnet_incr_dlc_seq();
2424         lnet_net_unlock(LNET_LOCK_EX);
2425
2426         /* if the network is not unique then we don't want to keep
2427          * it around after we're done. Free it. Otherwise add that
2428          * net to the global the_lnet.ln_nets */
2429         if (net_l != net && net_l != NULL) {
2430                 /*
2431                  * TODO - note. currently the tunables can not be updated
2432                  * once added
2433                  */
2434                 lnet_net_free(net);
2435         } else {
2436                 /*
2437                  * restore tunables after it has been overwitten by the
2438                  * lnd
2439                  */
2440                 if (peer_timeout != -1)
2441                         net->net_tunables.lct_peer_timeout = peer_timeout;
2442                 if (maxtxcredits != -1)
2443                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
2444                 if (peerrtrcredits != -1)
2445                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
2446
2447                 lnet_net_lock(LNET_LOCK_EX);
2448                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
2449                 lnet_net_unlock(LNET_LOCK_EX);
2450         }
2451
2452         /* update net count */
2453         lnet_current_net_count = lnet_get_net_count();
2454
2455         return ni_count;
2456
2457 failed1:
2458         /*
2459          * shutdown the new NIs that are being started up
2460          * free the NET being started
2461          */
2462         while (!list_empty(&local_ni_list)) {
2463                 ni = list_entry(local_ni_list.next, struct lnet_ni,
2464                                 ni_netlist);
2465
2466                 lnet_shutdown_lndni(ni);
2467         }
2468
2469 failed0:
2470         lnet_net_free(net);
2471
2472         return rc;
2473 }
2474
2475 static int
2476 lnet_startup_lndnets(struct list_head *netlist)
2477 {
2478         struct lnet_net         *net;
2479         int                     rc;
2480         int                     ni_count = 0;
2481
2482         /*
2483          * Change to running state before bringing up the LNDs. This
2484          * allows lnet_shutdown_lndnets() to assert that we've passed
2485          * through here.
2486          */
2487         lnet_net_lock(LNET_LOCK_EX);
2488         the_lnet.ln_state = LNET_STATE_RUNNING;
2489         lnet_net_unlock(LNET_LOCK_EX);
2490
2491         while (!list_empty(netlist)) {
2492                 net = list_entry(netlist->next, struct lnet_net, net_list);
2493                 list_del_init(&net->net_list);
2494
2495                 rc = lnet_startup_lndnet(net, NULL);
2496
2497                 if (rc < 0)
2498                         goto failed;
2499
2500                 ni_count += rc;
2501         }
2502
2503         return ni_count;
2504 failed:
2505         lnet_shutdown_lndnets();
2506
2507         return rc;
2508 }
2509
2510 /**
2511  * Initialize LNet library.
2512  *
2513  * Automatically called at module loading time. Caller has to call
2514  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
2515  * latter returned 0. It must be called exactly once.
2516  *
2517  * \retval 0 on success
2518  * \retval -ve on failures.
2519  */
2520 int lnet_lib_init(void)
2521 {
2522         int rc;
2523
2524         lnet_assert_wire_constants();
2525
2526         /* refer to global cfs_cpt_table for now */
2527         the_lnet.ln_cpt_table = cfs_cpt_tab;
2528         the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_tab);
2529
2530         LASSERT(the_lnet.ln_cpt_number > 0);
2531         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
2532                 /* we are under risk of consuming all lh_cookie */
2533                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
2534                        "please change setting of CPT-table and retry\n",
2535                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
2536                 return -E2BIG;
2537         }
2538
2539         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
2540                 the_lnet.ln_cpt_bits++;
2541
2542         rc = lnet_create_locks();
2543         if (rc != 0) {
2544                 CERROR("Can't create LNet global locks: %d\n", rc);
2545                 return rc;
2546         }
2547
2548         the_lnet.ln_refcount = 0;
2549         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
2550         INIT_LIST_HEAD(&the_lnet.ln_msg_resend);
2551
2552         /* The hash table size is the number of bits it takes to express the set
2553          * ln_num_routes, minus 1 (better to under estimate than over so we
2554          * don't waste memory). */
2555         if (rnet_htable_size <= 0)
2556                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
2557         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
2558                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
2559         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
2560                                            order_base_2(rnet_htable_size) - 1);
2561
2562         /* All LNDs apart from the LOLND are in separate modules.  They
2563          * register themselves when their module loads, and unregister
2564          * themselves when their module is unloaded. */
2565         lnet_register_lnd(&the_lolnd);
2566         return 0;
2567 }
2568
2569 /**
2570  * Finalize LNet library.
2571  *
2572  * \pre lnet_lib_init() called with success.
2573  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
2574  *
2575  * As this happens at module-unload, all lnds must already be unloaded,
2576  * so they must already be unregistered.
2577  */
2578 void lnet_lib_exit(void)
2579 {
2580         int i;
2581
2582         LASSERT(the_lnet.ln_refcount == 0);
2583         lnet_unregister_lnd(&the_lolnd);
2584         for (i = 0; i < NUM_LNDS; i++)
2585                 LASSERT(!the_lnet.ln_lnds[i]);
2586         lnet_destroy_locks();
2587 }
2588
2589 /**
2590  * Set LNet PID and start LNet interfaces, routing, and forwarding.
2591  *
2592  * Users must call this function at least once before any other functions.
2593  * For each successful call there must be a corresponding call to
2594  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
2595  * ignored.
2596  *
2597  * The PID used by LNet may be different from the one requested.
2598  * See LNetGetId().
2599  *
2600  * \param requested_pid PID requested by the caller.
2601  *
2602  * \return >= 0 on success, and < 0 error code on failures.
2603  */
2604 int
2605 LNetNIInit(lnet_pid_t requested_pid)
2606 {
2607         int                     im_a_router = 0;
2608         int                     rc;
2609         int                     ni_count;
2610         struct lnet_ping_buffer *pbuf;
2611         struct lnet_handle_md   ping_mdh;
2612         LIST_HEAD(net_head);
2613         struct lnet_net         *net;
2614
2615         mutex_lock(&the_lnet.ln_api_mutex);
2616
2617         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
2618
2619         if (the_lnet.ln_refcount > 0) {
2620                 rc = the_lnet.ln_refcount++;
2621                 mutex_unlock(&the_lnet.ln_api_mutex);
2622                 return rc;
2623         }
2624
2625         rc = lnet_prepare(requested_pid);
2626         if (rc != 0) {
2627                 mutex_unlock(&the_lnet.ln_api_mutex);
2628                 return rc;
2629         }
2630
2631         /* create a network for Loopback network */
2632         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
2633         if (net == NULL) {
2634                 rc = -ENOMEM;
2635                 goto err_empty_list;
2636         }
2637
2638         /* Add in the loopback NI */
2639         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
2640                 rc = -ENOMEM;
2641                 goto err_empty_list;
2642         }
2643
2644         /* If LNet is being initialized via DLC it is possible
2645          * that the user requests not to load module parameters (ones which
2646          * are supported by DLC) on initialization.  Therefore, make sure not
2647          * to load networks, routes and forwarding from module parameters
2648          * in this case.  On cleanup in case of failure only clean up
2649          * routes if it has been loaded */
2650         if (!the_lnet.ln_nis_from_mod_params) {
2651                 rc = lnet_parse_networks(&net_head, lnet_get_networks(),
2652                                          use_tcp_bonding);
2653                 if (rc < 0)
2654                         goto err_empty_list;
2655         }
2656
2657         ni_count = lnet_startup_lndnets(&net_head);
2658         if (ni_count < 0) {
2659                 rc = ni_count;
2660                 goto err_empty_list;
2661         }
2662
2663         if (!the_lnet.ln_nis_from_mod_params) {
2664                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
2665                 if (rc != 0)
2666                         goto err_shutdown_lndnis;
2667
2668                 rc = lnet_rtrpools_alloc(im_a_router);
2669                 if (rc != 0)
2670                         goto err_destroy_routes;
2671         }
2672
2673         rc = lnet_acceptor_start();
2674         if (rc != 0)
2675                 goto err_destroy_routes;
2676
2677         the_lnet.ln_refcount = 1;
2678         /* Now I may use my own API functions... */
2679
2680         rc = lnet_ping_target_setup(&pbuf, &ping_mdh, ni_count, true);
2681         if (rc != 0)
2682                 goto err_acceptor_stop;
2683
2684         lnet_ping_target_update(pbuf, ping_mdh);
2685
2686         the_lnet.ln_mt_eq = LNetEQAlloc(lnet_mt_event_handler);
2687         if (IS_ERR(the_lnet.ln_mt_eq)) {
2688                 rc = PTR_ERR(the_lnet.ln_mt_eq);
2689                 CERROR("Can't allocate monitor thread EQ: %d\n", rc);
2690                 goto err_stop_ping;
2691         }
2692
2693         rc = lnet_push_target_init();
2694         if (rc != 0)
2695                 goto err_stop_ping;
2696
2697         rc = lnet_peer_discovery_start();
2698         if (rc != 0)
2699                 goto err_destroy_push_target;
2700
2701         rc = lnet_monitor_thr_start();
2702         if (rc != 0)
2703                 goto err_stop_discovery_thr;
2704
2705         lnet_fault_init();
2706         lnet_router_debugfs_init();
2707
2708         mutex_unlock(&the_lnet.ln_api_mutex);
2709
2710         complete_all(&the_lnet.ln_started);
2711
2712         /* wait for all routers to start */
2713         lnet_wait_router_start();
2714
2715         return 0;
2716
2717 err_stop_discovery_thr:
2718         lnet_peer_discovery_stop();
2719 err_destroy_push_target:
2720         lnet_push_target_fini();
2721 err_stop_ping:
2722         lnet_ping_target_fini();
2723 err_acceptor_stop:
2724         the_lnet.ln_refcount = 0;
2725         lnet_acceptor_stop();
2726 err_destroy_routes:
2727         if (!the_lnet.ln_nis_from_mod_params)
2728                 lnet_destroy_routes();
2729 err_shutdown_lndnis:
2730         lnet_shutdown_lndnets();
2731 err_empty_list:
2732         lnet_unprepare();
2733         LASSERT(rc < 0);
2734         mutex_unlock(&the_lnet.ln_api_mutex);
2735         while (!list_empty(&net_head)) {
2736                 struct lnet_net *net;
2737
2738                 net = list_entry(net_head.next, struct lnet_net, net_list);
2739                 list_del_init(&net->net_list);
2740                 lnet_net_free(net);
2741         }
2742         return rc;
2743 }
2744 EXPORT_SYMBOL(LNetNIInit);
2745
2746 /**
2747  * Stop LNet interfaces, routing, and forwarding.
2748  *
2749  * Users must call this function once for each successful call to LNetNIInit().
2750  * Once the LNetNIFini() operation has been started, the results of pending
2751  * API operations are undefined.
2752  *
2753  * \return always 0 for current implementation.
2754  */
2755 int
2756 LNetNIFini(void)
2757 {
2758         mutex_lock(&the_lnet.ln_api_mutex);
2759
2760         LASSERT(the_lnet.ln_refcount > 0);
2761
2762         if (the_lnet.ln_refcount != 1) {
2763                 the_lnet.ln_refcount--;
2764         } else {
2765                 LASSERT(!the_lnet.ln_niinit_self);
2766
2767                 lnet_fault_fini();
2768
2769                 lnet_router_debugfs_fini();
2770                 lnet_monitor_thr_stop();
2771                 lnet_peer_discovery_stop();
2772                 lnet_push_target_fini();
2773                 lnet_ping_target_fini();
2774
2775                 /* Teardown fns that use my own API functions BEFORE here */
2776                 the_lnet.ln_refcount = 0;
2777
2778                 lnet_acceptor_stop();
2779                 lnet_destroy_routes();
2780                 lnet_shutdown_lndnets();
2781                 lnet_unprepare();
2782         }
2783
2784         mutex_unlock(&the_lnet.ln_api_mutex);
2785         return 0;
2786 }
2787 EXPORT_SYMBOL(LNetNIFini);
2788
2789 /**
2790  * Grabs the ni data from the ni structure and fills the out
2791  * parameters
2792  *
2793  * \param[in] ni network        interface structure
2794  * \param[out] cfg_ni           NI config information
2795  * \param[out] tun              network and LND tunables
2796  */
2797 static void
2798 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
2799                    struct lnet_ioctl_config_lnd_tunables *tun,
2800                    struct lnet_ioctl_element_stats *stats,
2801                    __u32 tun_size)
2802 {
2803         size_t min_size = 0;
2804         int i;
2805
2806         if (!ni || !cfg_ni || !tun)
2807                 return;
2808
2809         if (ni->ni_interfaces[0] != NULL) {
2810                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2811                         if (ni->ni_interfaces[i] != NULL) {
2812                                 strncpy(cfg_ni->lic_ni_intf[i],
2813                                         ni->ni_interfaces[i],
2814                                         sizeof(cfg_ni->lic_ni_intf[i]));
2815                         }
2816                 }
2817         }
2818
2819         cfg_ni->lic_nid = ni->ni_nid;
2820         if (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND)
2821                 cfg_ni->lic_status = LNET_NI_STATUS_UP;
2822         else
2823                 cfg_ni->lic_status = ni->ni_status->ns_status;
2824         cfg_ni->lic_tcp_bonding = use_tcp_bonding;
2825         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
2826
2827         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
2828
2829         if (stats) {
2830                 stats->iel_send_count = lnet_sum_stats(&ni->ni_stats,
2831                                                        LNET_STATS_TYPE_SEND);
2832                 stats->iel_recv_count = lnet_sum_stats(&ni->ni_stats,
2833                                                        LNET_STATS_TYPE_RECV);
2834                 stats->iel_drop_count = lnet_sum_stats(&ni->ni_stats,
2835                                                        LNET_STATS_TYPE_DROP);
2836         }
2837
2838         /*
2839          * tun->lt_tun will always be present, but in order to be
2840          * backwards compatible, we need to deal with the cases when
2841          * tun->lt_tun is smaller than what the kernel has, because it
2842          * comes from an older version of a userspace program, then we'll
2843          * need to copy as much information as we have available space.
2844          */
2845         min_size = tun_size - sizeof(tun->lt_cmn);
2846         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
2847
2848         /* copy over the cpts */
2849         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
2850             ni->ni_cpts == NULL)  {
2851                 for (i = 0; i < ni->ni_ncpts; i++)
2852                         cfg_ni->lic_cpts[i] = i;
2853         } else {
2854                 for (i = 0;
2855                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
2856                      i < LNET_MAX_SHOW_NUM_CPT;
2857                      i++)
2858                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
2859         }
2860         cfg_ni->lic_ncpts = ni->ni_ncpts;
2861 }
2862
2863 /**
2864  * NOTE: This is a legacy function left in the code to be backwards
2865  * compatible with older userspace programs. It should eventually be
2866  * removed.
2867  *
2868  * Grabs the ni data from the ni structure and fills the out
2869  * parameters
2870  *
2871  * \param[in] ni network        interface structure
2872  * \param[out] config           config information
2873  */
2874 static void
2875 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
2876                          struct lnet_ioctl_config_data *config)
2877 {
2878         struct lnet_ioctl_net_config *net_config;
2879         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
2880         size_t min_size, tunable_size = 0;
2881         int i;
2882
2883         if (!ni || !config)
2884                 return;
2885
2886         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
2887         if (!net_config)
2888                 return;
2889
2890         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
2891                      ARRAY_SIZE(net_config->ni_interfaces));
2892
2893         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2894                 if (!ni->ni_interfaces[i])
2895                         break;
2896
2897                 strncpy(net_config->ni_interfaces[i],
2898                         ni->ni_interfaces[i],
2899                         sizeof(net_config->ni_interfaces[i]));
2900         }
2901
2902         config->cfg_nid = ni->ni_nid;
2903         config->cfg_config_u.cfg_net.net_peer_timeout =
2904                 ni->ni_net->net_tunables.lct_peer_timeout;
2905         config->cfg_config_u.cfg_net.net_max_tx_credits =
2906                 ni->ni_net->net_tunables.lct_max_tx_credits;
2907         config->cfg_config_u.cfg_net.net_peer_tx_credits =
2908                 ni->ni_net->net_tunables.lct_peer_tx_credits;
2909         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
2910                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
2911
2912         if (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND)
2913                 net_config->ni_status = LNET_NI_STATUS_UP;
2914         else
2915                 net_config->ni_status = ni->ni_status->ns_status;
2916
2917         if (ni->ni_cpts) {
2918                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
2919
2920                 for (i = 0; i < num_cpts; i++)
2921                         net_config->ni_cpts[i] = ni->ni_cpts[i];
2922
2923                 config->cfg_ncpts = num_cpts;
2924         }
2925
2926         /*
2927          * See if user land tools sent in a newer and larger version
2928          * of struct lnet_tunables than what the kernel uses.
2929          */
2930         min_size = sizeof(*config) + sizeof(*net_config);
2931
2932         if (config->cfg_hdr.ioc_len > min_size)
2933                 tunable_size = config->cfg_hdr.ioc_len - min_size;
2934
2935         /* Don't copy too much data to user space */
2936         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
2937         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
2938
2939         if (lnd_cfg && min_size) {
2940                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
2941                 config->cfg_config_u.cfg_net.net_interface_count = 1;
2942
2943                 /* Tell user land that kernel side has less data */
2944                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
2945                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
2946                         config->cfg_hdr.ioc_len -= min_size;
2947                 }
2948         }
2949 }
2950
2951 struct lnet_ni *
2952 lnet_get_ni_idx_locked(int idx)
2953 {
2954         struct lnet_ni          *ni;
2955         struct lnet_net         *net;
2956
2957         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2958                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2959                         if (idx-- == 0)
2960                                 return ni;
2961                 }
2962         }
2963
2964         return NULL;
2965 }
2966
2967 struct lnet_ni *
2968 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
2969 {
2970         struct lnet_ni          *ni;
2971         struct lnet_net         *net = mynet;
2972
2973         /*
2974          * It is possible that the net has been cleaned out while there is
2975          * a message being sent. This function accessed the net without
2976          * checking if the list is empty
2977          */
2978         if (prev == NULL) {
2979                 if (net == NULL)
2980                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
2981                                         net_list);
2982                 if (list_empty(&net->net_ni_list))
2983                         return NULL;
2984                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2985                                 ni_netlist);
2986
2987                 return ni;
2988         }
2989
2990         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
2991                 /* if you reached the end of the ni list and the net is
2992                  * specified, then there are no more nis in that net */
2993                 if (net != NULL)
2994                         return NULL;
2995
2996                 /* we reached the end of this net ni list. move to the
2997                  * next net */
2998                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
2999                         /* no more nets and no more NIs. */
3000                         return NULL;
3001
3002                 /* get the next net */
3003                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
3004                                  net_list);
3005                 if (list_empty(&net->net_ni_list))
3006                         return NULL;
3007                 /* get the ni on it */
3008                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
3009                                 ni_netlist);
3010
3011                 return ni;
3012         }
3013
3014         if (list_empty(&prev->ni_netlist))
3015                 return NULL;
3016
3017         /* there are more nis left */
3018         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
3019
3020         return ni;
3021 }
3022
3023 int
3024 lnet_get_net_config(struct lnet_ioctl_config_data *config)
3025 {
3026         struct lnet_ni *ni;
3027         int cpt;
3028         int rc = -ENOENT;
3029         int idx = config->cfg_count;
3030
3031         cpt = lnet_net_lock_current();
3032
3033         ni = lnet_get_ni_idx_locked(idx);
3034
3035         if (ni != NULL) {
3036                 rc = 0;
3037                 lnet_ni_lock(ni);
3038                 lnet_fill_ni_info_legacy(ni, config);
3039                 lnet_ni_unlock(ni);
3040         }
3041
3042         lnet_net_unlock(cpt);
3043         return rc;
3044 }
3045
3046 int
3047 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
3048                    struct lnet_ioctl_config_lnd_tunables *tun,
3049                    struct lnet_ioctl_element_stats *stats,
3050                    __u32 tun_size)
3051 {
3052         struct lnet_ni          *ni;
3053         int                     cpt;
3054         int                     rc = -ENOENT;
3055
3056         if (!cfg_ni || !tun || !stats)
3057                 return -EINVAL;
3058
3059         cpt = lnet_net_lock_current();
3060
3061         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
3062
3063         if (ni) {
3064                 rc = 0;
3065                 lnet_ni_lock(ni);
3066                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
3067                 lnet_ni_unlock(ni);
3068         }
3069
3070         lnet_net_unlock(cpt);
3071         return rc;
3072 }
3073
3074 int lnet_get_ni_stats(struct lnet_ioctl_element_msg_stats *msg_stats)
3075 {
3076         struct lnet_ni *ni;
3077         int cpt;
3078         int rc = -ENOENT;
3079
3080         if (!msg_stats)
3081                 return -EINVAL;
3082
3083         cpt = lnet_net_lock_current();
3084
3085         ni = lnet_get_ni_idx_locked(msg_stats->im_idx);
3086
3087         if (ni) {
3088                 lnet_usr_translate_stats(msg_stats, &ni->ni_stats);
3089                 rc = 0;
3090         }
3091
3092         lnet_net_unlock(cpt);
3093
3094         return rc;
3095 }
3096
3097 static int lnet_add_net_common(struct lnet_net *net,
3098                                struct lnet_ioctl_config_lnd_tunables *tun)
3099 {
3100         __u32                   net_id;
3101         struct lnet_ping_buffer *pbuf;
3102         struct lnet_handle_md   ping_mdh;
3103         int                     rc;
3104         struct lnet_remotenet *rnet;
3105         int                     net_ni_count;
3106         int                     num_acceptor_nets;
3107
3108         lnet_net_lock(LNET_LOCK_EX);
3109         rnet = lnet_find_rnet_locked(net->net_id);
3110         lnet_net_unlock(LNET_LOCK_EX);
3111         /*
3112          * make sure that the net added doesn't invalidate the current
3113          * configuration LNet is keeping
3114          */
3115         if (rnet) {
3116                 CERROR("Adding net %s will invalidate routing configuration\n",
3117                        libcfs_net2str(net->net_id));
3118                 lnet_net_free(net);
3119                 return -EUSERS;
3120         }
3121
3122         /*
3123          * make sure you calculate the correct number of slots in the ping
3124          * buffer. Since the ping info is a flattened list of all the NIs,
3125          * we should allocate enough slots to accomodate the number of NIs
3126          * which will be added.
3127          *
3128          * since ni hasn't been configured yet, use
3129          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
3130          */
3131         net_ni_count = lnet_get_net_ni_count_pre(net);
3132
3133         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3134                                     net_ni_count + lnet_get_ni_count(),
3135                                     false);
3136         if (rc < 0) {
3137                 lnet_net_free(net);
3138                 return rc;
3139         }
3140
3141         if (tun)
3142                 memcpy(&net->net_tunables,
3143                        &tun->lt_cmn, sizeof(net->net_tunables));
3144         else
3145                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
3146
3147         /*
3148          * before starting this network get a count of the current TCP
3149          * networks which require the acceptor thread running. If that
3150          * count is == 0 before we start up this network, then we'd want to
3151          * start up the acceptor thread after starting up this network
3152          */
3153         num_acceptor_nets = lnet_count_acceptor_nets();
3154
3155         net_id = net->net_id;
3156
3157         rc = lnet_startup_lndnet(net,
3158                                  (tun) ? &tun->lt_tun : NULL);
3159         if (rc < 0)
3160                 goto failed;
3161
3162         lnet_net_lock(LNET_LOCK_EX);
3163         net = lnet_get_net_locked(net_id);
3164         lnet_net_unlock(LNET_LOCK_EX);
3165
3166         LASSERT(net);
3167
3168         /*
3169          * Start the acceptor thread if this is the first network
3170          * being added that requires the thread.
3171          */
3172         if (net->net_lnd->lnd_accept && num_acceptor_nets == 0) {
3173                 rc = lnet_acceptor_start();
3174                 if (rc < 0) {
3175                         /* shutdown the net that we just started */
3176                         CERROR("Failed to start up acceptor thread\n");
3177                         lnet_shutdown_lndnet(net);
3178                         goto failed;
3179                 }
3180         }
3181
3182         lnet_net_lock(LNET_LOCK_EX);
3183         lnet_peer_net_added(net);
3184         lnet_net_unlock(LNET_LOCK_EX);
3185
3186         lnet_ping_target_update(pbuf, ping_mdh);
3187
3188         return 0;
3189
3190 failed:
3191         lnet_ping_md_unlink(pbuf, &ping_mdh);
3192         lnet_ping_buffer_decref(pbuf);
3193         return rc;
3194 }
3195
3196 static int lnet_handle_legacy_ip2nets(char *ip2nets,
3197                                       struct lnet_ioctl_config_lnd_tunables *tun)
3198 {
3199         struct lnet_net *net;
3200         char *nets;
3201         int rc;
3202         LIST_HEAD(net_head);
3203
3204         rc = lnet_parse_ip2nets(&nets, ip2nets);
3205         if (rc < 0)
3206                 return rc;
3207
3208         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3209         if (rc < 0)
3210                 return rc;
3211
3212         mutex_lock(&the_lnet.ln_api_mutex);
3213         while (!list_empty(&net_head)) {
3214                 net = list_entry(net_head.next, struct lnet_net, net_list);
3215                 list_del_init(&net->net_list);
3216                 rc = lnet_add_net_common(net, tun);
3217                 if (rc < 0)
3218                         goto out;
3219         }
3220
3221 out:
3222         mutex_unlock(&the_lnet.ln_api_mutex);
3223
3224         while (!list_empty(&net_head)) {
3225                 net = list_entry(net_head.next, struct lnet_net, net_list);
3226                 list_del_init(&net->net_list);
3227                 lnet_net_free(net);
3228         }
3229         return rc;
3230 }
3231
3232 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
3233 {
3234         struct lnet_net *net;
3235         struct lnet_ni *ni;
3236         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3237         int rc, i;
3238         __u32 net_id, lnd_type;
3239
3240         /* get the tunables if they are available */
3241         if (conf->lic_cfg_hdr.ioc_len >=
3242             sizeof(*conf) + sizeof(*tun))
3243                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3244                         conf->lic_bulk;
3245
3246         /* handle legacy ip2nets from DLC */
3247         if (conf->lic_legacy_ip2nets[0] != '\0')
3248                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
3249                                                   tun);
3250
3251         net_id = LNET_NIDNET(conf->lic_nid);
3252         lnd_type = LNET_NETTYP(net_id);
3253
3254         if (!libcfs_isknown_lnd(lnd_type)) {
3255                 CERROR("No valid net and lnd information provided\n");
3256                 return -EINVAL;
3257         }
3258
3259         net = lnet_net_alloc(net_id, NULL);
3260         if (!net)
3261                 return -ENOMEM;
3262
3263         for (i = 0; i < conf->lic_ncpts; i++) {
3264                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
3265                         return -EINVAL;
3266         }
3267
3268         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
3269                                        conf->lic_ni_intf[0]);
3270         if (!ni)
3271                 return -ENOMEM;
3272
3273         mutex_lock(&the_lnet.ln_api_mutex);
3274
3275         rc = lnet_add_net_common(net, tun);
3276
3277         mutex_unlock(&the_lnet.ln_api_mutex);
3278
3279         return rc;
3280 }
3281
3282 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
3283 {
3284         struct lnet_net  *net;
3285         struct lnet_ni *ni;
3286         __u32 net_id = LNET_NIDNET(conf->lic_nid);
3287         struct lnet_ping_buffer *pbuf;
3288         struct lnet_handle_md  ping_mdh;
3289         int               rc;
3290         int               net_count;
3291         __u32             addr;
3292
3293         /* don't allow userspace to shutdown the LOLND */
3294         if (LNET_NETTYP(net_id) == LOLND)
3295                 return -EINVAL;
3296
3297         mutex_lock(&the_lnet.ln_api_mutex);
3298
3299         lnet_net_lock(0);
3300
3301         net = lnet_get_net_locked(net_id);
3302         if (!net) {
3303                 CERROR("net %s not found\n",
3304                        libcfs_net2str(net_id));
3305                 rc = -ENOENT;
3306                 goto unlock_net;
3307         }
3308
3309         addr = LNET_NIDADDR(conf->lic_nid);
3310         if (addr == 0) {
3311                 /* remove the entire net */
3312                 net_count = lnet_get_net_ni_count_locked(net);
3313
3314                 lnet_net_unlock(0);
3315
3316                 /* create and link a new ping info, before removing the old one */
3317                 rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3318                                         lnet_get_ni_count() - net_count,
3319                                         false);
3320                 if (rc != 0)
3321                         goto unlock_api_mutex;
3322
3323                 lnet_shutdown_lndnet(net);
3324
3325                 if (lnet_count_acceptor_nets() == 0)
3326                         lnet_acceptor_stop();
3327
3328                 lnet_ping_target_update(pbuf, ping_mdh);
3329
3330                 goto unlock_api_mutex;
3331         }
3332
3333         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
3334         if (!ni) {
3335                 CERROR("nid %s not found\n",
3336                        libcfs_nid2str(conf->lic_nid));
3337                 rc = -ENOENT;
3338                 goto unlock_net;
3339         }
3340
3341         net_count = lnet_get_net_ni_count_locked(net);
3342
3343         lnet_net_unlock(0);
3344
3345         /* create and link a new ping info, before removing the old one */
3346         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3347                                   lnet_get_ni_count() - 1, false);
3348         if (rc != 0)
3349                 goto unlock_api_mutex;
3350
3351         lnet_shutdown_lndni(ni);
3352
3353         if (lnet_count_acceptor_nets() == 0)
3354                 lnet_acceptor_stop();
3355
3356         lnet_ping_target_update(pbuf, ping_mdh);
3357
3358         /* check if the net is empty and remove it if it is */
3359         if (net_count == 1)
3360                 lnet_shutdown_lndnet(net);
3361
3362         goto unlock_api_mutex;
3363
3364 unlock_net:
3365         lnet_net_unlock(0);
3366 unlock_api_mutex:
3367         mutex_unlock(&the_lnet.ln_api_mutex);
3368
3369         return rc;
3370 }
3371
3372 /*
3373  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
3374  * They are only expected to be called for unique networks.
3375  * That can be as a result of older DLC library
3376  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
3377  */
3378 int
3379 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
3380 {
3381         struct lnet_net *net;
3382         LIST_HEAD(net_head);
3383         int rc;
3384         struct lnet_ioctl_config_lnd_tunables tun;
3385         char *nets = conf->cfg_config_u.cfg_net.net_intf;
3386
3387         /* Create a net/ni structures for the network string */
3388         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3389         if (rc <= 0)
3390                 return rc == 0 ? -EINVAL : rc;
3391
3392         mutex_lock(&the_lnet.ln_api_mutex);
3393
3394         if (rc > 1) {
3395                 rc = -EINVAL; /* only add one network per call */
3396                 goto out_unlock_clean;
3397         }
3398
3399         net = list_entry(net_head.next, struct lnet_net, net_list);
3400         list_del_init(&net->net_list);
3401
3402         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
3403
3404         memset(&tun, 0, sizeof(tun));
3405
3406         tun.lt_cmn.lct_peer_timeout =
3407           conf->cfg_config_u.cfg_net.net_peer_timeout;
3408         tun.lt_cmn.lct_peer_tx_credits =
3409           conf->cfg_config_u.cfg_net.net_peer_tx_credits;
3410         tun.lt_cmn.lct_peer_rtr_credits =
3411           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
3412         tun.lt_cmn.lct_max_tx_credits =
3413           conf->cfg_config_u.cfg_net.net_max_tx_credits;
3414
3415         rc = lnet_add_net_common(net, &tun);
3416
3417 out_unlock_clean:
3418         mutex_unlock(&the_lnet.ln_api_mutex);
3419         while (!list_empty(&net_head)) {
3420                 /* net_head list is empty in success case */
3421                 net = list_entry(net_head.next, struct lnet_net, net_list);
3422                 list_del_init(&net->net_list);
3423                 lnet_net_free(net);
3424         }
3425         return rc;
3426 }
3427
3428 int
3429 lnet_dyn_del_net(__u32 net_id)
3430 {
3431         struct lnet_net  *net;
3432         struct lnet_ping_buffer *pbuf;
3433         struct lnet_handle_md ping_mdh;
3434         int               rc;
3435         int               net_ni_count;
3436
3437         /* don't allow userspace to shutdown the LOLND */
3438         if (LNET_NETTYP(net_id) == LOLND)
3439                 return -EINVAL;
3440
3441         mutex_lock(&the_lnet.ln_api_mutex);
3442
3443         lnet_net_lock(0);
3444
3445         net = lnet_get_net_locked(net_id);
3446         if (net == NULL) {
3447                 lnet_net_unlock(0);
3448                 rc = -EINVAL;
3449                 goto out;
3450         }
3451
3452         net_ni_count = lnet_get_net_ni_count_locked(net);
3453
3454         lnet_net_unlock(0);
3455
3456         /* create and link a new ping info, before removing the old one */
3457         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3458                                     lnet_get_ni_count() - net_ni_count, false);
3459         if (rc != 0)
3460                 goto out;
3461
3462         lnet_shutdown_lndnet(net);
3463
3464         if (lnet_count_acceptor_nets() == 0)
3465                 lnet_acceptor_stop();
3466
3467         lnet_ping_target_update(pbuf, ping_mdh);
3468
3469 out:
3470         mutex_unlock(&the_lnet.ln_api_mutex);
3471
3472         return rc;
3473 }
3474
3475 void lnet_incr_dlc_seq(void)
3476 {
3477         atomic_inc(&lnet_dlc_seq_no);
3478 }
3479
3480 __u32 lnet_get_dlc_seq_locked(void)
3481 {
3482         return atomic_read(&lnet_dlc_seq_no);
3483 }
3484
3485 static void
3486 lnet_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3487 {
3488         struct lnet_net *net;
3489         struct lnet_ni *ni;
3490
3491         lnet_net_lock(LNET_LOCK_EX);
3492         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3493                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3494                         if (ni->ni_nid == nid || all) {
3495                                 atomic_set(&ni->ni_healthv, value);
3496                                 if (list_empty(&ni->ni_recovery) &&
3497                                     value < LNET_MAX_HEALTH_VALUE) {
3498                                         CERROR("manually adding local NI %s to recovery\n",
3499                                                libcfs_nid2str(ni->ni_nid));
3500                                         list_add_tail(&ni->ni_recovery,
3501                                                       &the_lnet.ln_mt_localNIRecovq);
3502                                         lnet_ni_addref_locked(ni, 0);
3503                                 }
3504                                 if (!all) {
3505                                         lnet_net_unlock(LNET_LOCK_EX);
3506                                         return;
3507                                 }
3508                         }
3509                 }
3510         }
3511         lnet_net_unlock(LNET_LOCK_EX);
3512 }
3513
3514 static int
3515 lnet_get_local_ni_hstats(struct lnet_ioctl_local_ni_hstats *stats)
3516 {
3517         int cpt, rc = 0;
3518         struct lnet_ni *ni;
3519         lnet_nid_t nid = stats->hlni_nid;
3520
3521         cpt = lnet_net_lock_current();
3522         ni = lnet_nid2ni_locked(nid, cpt);
3523
3524         if (!ni) {
3525                 rc = -ENOENT;
3526                 goto unlock;
3527         }
3528
3529         stats->hlni_local_interrupt = atomic_read(&ni->ni_hstats.hlt_local_interrupt);
3530         stats->hlni_local_dropped = atomic_read(&ni->ni_hstats.hlt_local_dropped);
3531         stats->hlni_local_aborted = atomic_read(&ni->ni_hstats.hlt_local_aborted);
3532         stats->hlni_local_no_route = atomic_read(&ni->ni_hstats.hlt_local_no_route);
3533         stats->hlni_local_timeout = atomic_read(&ni->ni_hstats.hlt_local_timeout);
3534         stats->hlni_local_error = atomic_read(&ni->ni_hstats.hlt_local_error);
3535         stats->hlni_health_value = atomic_read(&ni->ni_healthv);
3536
3537 unlock:
3538         lnet_net_unlock(cpt);
3539
3540         return rc;
3541 }
3542
3543 static int
3544 lnet_get_local_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3545 {
3546         struct lnet_ni *ni;
3547         int i = 0;
3548
3549         lnet_net_lock(LNET_LOCK_EX);
3550         list_for_each_entry(ni, &the_lnet.ln_mt_localNIRecovq, ni_recovery) {
3551                 list->rlst_nid_array[i] = ni->ni_nid;
3552                 i++;
3553                 if (i >= LNET_MAX_SHOW_NUM_NID)
3554                         break;
3555         }
3556         lnet_net_unlock(LNET_LOCK_EX);
3557         list->rlst_num_nids = i;
3558
3559         return 0;
3560 }
3561
3562 static int
3563 lnet_get_peer_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3564 {
3565         struct lnet_peer_ni *lpni;
3566         int i = 0;
3567
3568         lnet_net_lock(LNET_LOCK_EX);
3569         list_for_each_entry(lpni, &the_lnet.ln_mt_peerNIRecovq, lpni_recovery) {
3570                 list->rlst_nid_array[i] = lpni->lpni_nid;
3571                 i++;
3572                 if (i >= LNET_MAX_SHOW_NUM_NID)
3573                         break;
3574         }
3575         lnet_net_unlock(LNET_LOCK_EX);
3576         list->rlst_num_nids = i;
3577
3578         return 0;
3579 }
3580
3581 /**
3582  * LNet ioctl handler.
3583  *
3584  */
3585 int
3586 LNetCtl(unsigned int cmd, void *arg)
3587 {
3588         struct libcfs_ioctl_data *data = arg;
3589         struct lnet_ioctl_config_data *config;
3590         struct lnet_process_id    id = {0};
3591         struct lnet_ni           *ni;
3592         int                       rc;
3593
3594         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
3595                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
3596
3597         switch (cmd) {
3598         case IOC_LIBCFS_GET_NI:
3599                 rc = LNetGetId(data->ioc_count, &id);
3600                 data->ioc_nid = id.nid;
3601                 return rc;
3602
3603         case IOC_LIBCFS_FAIL_NID:
3604                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
3605
3606         case IOC_LIBCFS_ADD_ROUTE: {
3607                 /* default router sensitivity to 1 */
3608                 unsigned int sensitivity = 1;
3609                 config = arg;
3610
3611                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3612                         return -EINVAL;
3613
3614                 if (config->cfg_config_u.cfg_route.rtr_sensitivity) {
3615                         sensitivity =
3616                           config->cfg_config_u.cfg_route.rtr_sensitivity;
3617                 }
3618
3619                 mutex_lock(&the_lnet.ln_api_mutex);
3620                 rc = lnet_add_route(config->cfg_net,
3621                                     config->cfg_config_u.cfg_route.rtr_hop,
3622                                     config->cfg_nid,
3623                                     config->cfg_config_u.cfg_route.
3624                                         rtr_priority, sensitivity);
3625                 mutex_unlock(&the_lnet.ln_api_mutex);
3626                 return rc;
3627         }
3628
3629         case IOC_LIBCFS_DEL_ROUTE:
3630                 config = arg;
3631
3632                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3633                         return -EINVAL;
3634
3635                 mutex_lock(&the_lnet.ln_api_mutex);
3636                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
3637                 mutex_unlock(&the_lnet.ln_api_mutex);
3638                 return rc;
3639
3640         case IOC_LIBCFS_GET_ROUTE:
3641                 config = arg;
3642
3643                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3644                         return -EINVAL;
3645
3646                 mutex_lock(&the_lnet.ln_api_mutex);
3647                 rc = lnet_get_route(config->cfg_count,
3648                                     &config->cfg_net,
3649                                     &config->cfg_config_u.cfg_route.rtr_hop,
3650                                     &config->cfg_nid,
3651                                     &config->cfg_config_u.cfg_route.rtr_flags,
3652                                     &config->cfg_config_u.cfg_route.
3653                                         rtr_priority,
3654                                     &config->cfg_config_u.cfg_route.
3655                                         rtr_sensitivity);
3656                 mutex_unlock(&the_lnet.ln_api_mutex);
3657                 return rc;
3658
3659         case IOC_LIBCFS_GET_LOCAL_NI: {
3660                 struct lnet_ioctl_config_ni *cfg_ni;
3661                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3662                 struct lnet_ioctl_element_stats *stats;
3663                 __u32 tun_size;
3664
3665                 cfg_ni = arg;
3666
3667                 /* get the tunables if they are available */
3668                 if (cfg_ni->lic_cfg_hdr.ioc_len <
3669                     sizeof(*cfg_ni) + sizeof(*stats) + sizeof(*tun))
3670                         return -EINVAL;
3671
3672                 stats = (struct lnet_ioctl_element_stats *)
3673                         cfg_ni->lic_bulk;
3674                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3675                                 (cfg_ni->lic_bulk + sizeof(*stats));
3676
3677                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
3678                         sizeof(*stats);
3679
3680                 mutex_lock(&the_lnet.ln_api_mutex);
3681                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
3682                 mutex_unlock(&the_lnet.ln_api_mutex);
3683                 return rc;
3684         }
3685
3686         case IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS: {
3687                 struct lnet_ioctl_element_msg_stats *msg_stats = arg;
3688
3689                 if (msg_stats->im_hdr.ioc_len != sizeof(*msg_stats))
3690                         return -EINVAL;
3691
3692                 mutex_lock(&the_lnet.ln_api_mutex);
3693                 rc = lnet_get_ni_stats(msg_stats);
3694                 mutex_unlock(&the_lnet.ln_api_mutex);
3695
3696                 return rc;
3697         }
3698
3699         case IOC_LIBCFS_GET_NET: {
3700                 size_t total = sizeof(*config) +
3701                                sizeof(struct lnet_ioctl_net_config);
3702                 config = arg;
3703
3704                 if (config->cfg_hdr.ioc_len < total)
3705                         return -EINVAL;
3706
3707                 mutex_lock(&the_lnet.ln_api_mutex);
3708                 rc = lnet_get_net_config(config);
3709                 mutex_unlock(&the_lnet.ln_api_mutex);
3710                 return rc;
3711         }
3712
3713         case IOC_LIBCFS_GET_LNET_STATS:
3714         {
3715                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
3716
3717                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
3718                         return -EINVAL;
3719
3720                 mutex_lock(&the_lnet.ln_api_mutex);
3721                 lnet_counters_get(&lnet_stats->st_cntrs);
3722                 mutex_unlock(&the_lnet.ln_api_mutex);
3723                 return 0;
3724         }
3725
3726         case IOC_LIBCFS_CONFIG_RTR:
3727                 config = arg;
3728
3729                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3730                         return -EINVAL;
3731
3732                 mutex_lock(&the_lnet.ln_api_mutex);
3733                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
3734                         rc = lnet_rtrpools_enable();
3735                         mutex_unlock(&the_lnet.ln_api_mutex);
3736                         return rc;
3737                 }
3738                 lnet_rtrpools_disable();
3739                 mutex_unlock(&the_lnet.ln_api_mutex);
3740                 return 0;
3741
3742         case IOC_LIBCFS_ADD_BUF:
3743                 config = arg;
3744
3745                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3746                         return -EINVAL;
3747
3748                 mutex_lock(&the_lnet.ln_api_mutex);
3749                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
3750                                                 buf_tiny,
3751                                           config->cfg_config_u.cfg_buffers.
3752                                                 buf_small,
3753                                           config->cfg_config_u.cfg_buffers.
3754                                                 buf_large);
3755                 mutex_unlock(&the_lnet.ln_api_mutex);
3756                 return rc;
3757
3758         case IOC_LIBCFS_SET_NUMA_RANGE: {
3759                 struct lnet_ioctl_set_value *numa;
3760                 numa = arg;
3761                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3762                         return -EINVAL;
3763                 lnet_net_lock(LNET_LOCK_EX);
3764                 lnet_numa_range = numa->sv_value;
3765                 lnet_net_unlock(LNET_LOCK_EX);
3766                 return 0;
3767         }
3768
3769         case IOC_LIBCFS_GET_NUMA_RANGE: {
3770                 struct lnet_ioctl_set_value *numa;
3771                 numa = arg;
3772                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3773                         return -EINVAL;
3774                 numa->sv_value = lnet_numa_range;
3775                 return 0;
3776         }
3777
3778         case IOC_LIBCFS_GET_BUF: {
3779                 struct lnet_ioctl_pool_cfg *pool_cfg;
3780                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
3781
3782                 config = arg;
3783
3784                 if (config->cfg_hdr.ioc_len < total)
3785                         return -EINVAL;
3786
3787                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
3788
3789                 mutex_lock(&the_lnet.ln_api_mutex);
3790                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
3791                 mutex_unlock(&the_lnet.ln_api_mutex);
3792                 return rc;
3793         }
3794
3795         case IOC_LIBCFS_GET_LOCAL_HSTATS: {
3796                 struct lnet_ioctl_local_ni_hstats *stats = arg;
3797
3798                 if (stats->hlni_hdr.ioc_len < sizeof(*stats))
3799                         return -EINVAL;
3800
3801                 mutex_lock(&the_lnet.ln_api_mutex);
3802                 rc = lnet_get_local_ni_hstats(stats);
3803                 mutex_unlock(&the_lnet.ln_api_mutex);
3804
3805                 return rc;
3806         }
3807
3808         case IOC_LIBCFS_GET_RECOVERY_QUEUE: {
3809                 struct lnet_ioctl_recovery_list *list = arg;
3810                 if (list->rlst_hdr.ioc_len < sizeof(*list))
3811                         return -EINVAL;
3812
3813                 mutex_lock(&the_lnet.ln_api_mutex);
3814                 if (list->rlst_type == LNET_HEALTH_TYPE_LOCAL_NI)
3815                         rc = lnet_get_local_ni_recovery_list(list);
3816                 else
3817                         rc = lnet_get_peer_ni_recovery_list(list);
3818                 mutex_unlock(&the_lnet.ln_api_mutex);
3819                 return rc;
3820         }
3821
3822         case IOC_LIBCFS_ADD_PEER_NI: {
3823                 struct lnet_ioctl_peer_cfg *cfg = arg;
3824
3825                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3826                         return -EINVAL;
3827
3828                 mutex_lock(&the_lnet.ln_api_mutex);
3829                 rc = lnet_add_peer_ni(cfg->prcfg_prim_nid,
3830                                       cfg->prcfg_cfg_nid,
3831                                       cfg->prcfg_mr);
3832                 mutex_unlock(&the_lnet.ln_api_mutex);
3833                 return rc;
3834         }
3835
3836         case IOC_LIBCFS_DEL_PEER_NI: {
3837                 struct lnet_ioctl_peer_cfg *cfg = arg;
3838
3839                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3840                         return -EINVAL;
3841
3842                 mutex_lock(&the_lnet.ln_api_mutex);
3843                 rc = lnet_del_peer_ni(cfg->prcfg_prim_nid,
3844                                       cfg->prcfg_cfg_nid);
3845                 mutex_unlock(&the_lnet.ln_api_mutex);
3846                 return rc;
3847         }
3848
3849         case IOC_LIBCFS_GET_PEER_INFO: {
3850                 struct lnet_ioctl_peer *peer_info = arg;
3851
3852                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
3853                         return -EINVAL;
3854
3855                 mutex_lock(&the_lnet.ln_api_mutex);
3856                 rc = lnet_get_peer_ni_info(
3857                    peer_info->pr_count,
3858                    &peer_info->pr_nid,
3859                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
3860                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
3861                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
3862                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
3863                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
3864                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
3865                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
3866                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
3867                 mutex_unlock(&the_lnet.ln_api_mutex);
3868                 return rc;
3869         }
3870
3871         case IOC_LIBCFS_GET_PEER_NI: {
3872                 struct lnet_ioctl_peer_cfg *cfg = arg;
3873
3874                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3875                         return -EINVAL;
3876
3877                 mutex_lock(&the_lnet.ln_api_mutex);
3878                 rc = lnet_get_peer_info(cfg,
3879                                         (void __user *)cfg->prcfg_bulk);
3880                 mutex_unlock(&the_lnet.ln_api_mutex);
3881                 return rc;
3882         }
3883
3884         case IOC_LIBCFS_GET_PEER_LIST: {
3885                 struct lnet_ioctl_peer_cfg *cfg = arg;
3886
3887                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3888                         return -EINVAL;
3889
3890                 mutex_lock(&the_lnet.ln_api_mutex);
3891                 rc = lnet_get_peer_list(&cfg->prcfg_count, &cfg->prcfg_size,
3892                                 (struct lnet_process_id __user *)cfg->prcfg_bulk);
3893                 mutex_unlock(&the_lnet.ln_api_mutex);
3894                 return rc;
3895         }
3896
3897         case IOC_LIBCFS_SET_HEALHV: {
3898                 struct lnet_ioctl_reset_health_cfg *cfg = arg;
3899                 int value;
3900                 if (cfg->rh_hdr.ioc_len < sizeof(*cfg))
3901                         return -EINVAL;
3902                 if (cfg->rh_value < 0 ||
3903                     cfg->rh_value > LNET_MAX_HEALTH_VALUE)
3904                         value = LNET_MAX_HEALTH_VALUE;
3905                 else
3906                         value = cfg->rh_value;
3907                 CDEBUG(D_NET, "Manually setting healthv to %d for %s:%s. all = %d\n",
3908                        value, (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI) ?
3909                        "local" : "peer", libcfs_nid2str(cfg->rh_nid), cfg->rh_all);
3910                 mutex_lock(&the_lnet.ln_api_mutex);
3911                 if (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI)
3912                         lnet_ni_set_healthv(cfg->rh_nid, value,
3913                                              cfg->rh_all);
3914                 else
3915                         lnet_peer_ni_set_healthv(cfg->rh_nid, value,
3916                                                   cfg->rh_all);
3917                 mutex_unlock(&the_lnet.ln_api_mutex);
3918                 return 0;
3919         }
3920
3921         case IOC_LIBCFS_NOTIFY_ROUTER: {
3922                 time64_t deadline = ktime_get_real_seconds() - data->ioc_u64[0];
3923
3924                 /* The deadline passed in by the user should be some time in
3925                  * seconds in the future since the UNIX epoch. We have to map
3926                  * that deadline to the wall clock.
3927                  */
3928                 deadline += ktime_get_seconds();
3929                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags, false,
3930                                    deadline);
3931         }
3932
3933         case IOC_LIBCFS_LNET_DIST:
3934                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
3935                 if (rc < 0 && rc != -EHOSTUNREACH)
3936                         return rc;
3937
3938                 data->ioc_u32[0] = rc;
3939                 return 0;
3940
3941         case IOC_LIBCFS_TESTPROTOCOMPAT:
3942                 the_lnet.ln_testprotocompat = data->ioc_flags;
3943                 return 0;
3944
3945         case IOC_LIBCFS_LNET_FAULT:
3946                 return lnet_fault_ctl(data->ioc_flags, data);
3947
3948         case IOC_LIBCFS_PING: {
3949                 signed long timeout;
3950
3951                 id.nid = data->ioc_nid;
3952                 id.pid = data->ioc_u32[0];
3953
3954                 /* If timeout is negative then set default of 3 minutes */
3955                 if (((s32)data->ioc_u32[1] <= 0) ||
3956                     data->ioc_u32[1] > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3957                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3958                 else
3959                         timeout = nsecs_to_jiffies(data->ioc_u32[1] * NSEC_PER_MSEC);
3960
3961                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
3962                                data->ioc_plen1 / sizeof(struct lnet_process_id));
3963
3964                 if (rc < 0)
3965                         return rc;
3966
3967                 data->ioc_count = rc;
3968                 return 0;
3969         }
3970
3971         case IOC_LIBCFS_PING_PEER: {
3972                 struct lnet_ioctl_ping_data *ping = arg;
3973                 struct lnet_peer *lp;
3974                 signed long timeout;
3975
3976                 /* If timeout is negative then set default of 3 minutes */
3977                 if (((s32)ping->op_param) <= 0 ||
3978                     ping->op_param > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3979                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3980                 else
3981                         timeout = nsecs_to_jiffies(ping->op_param * NSEC_PER_MSEC);
3982
3983                 rc = lnet_ping(ping->ping_id, timeout,
3984                                ping->ping_buf,
3985                                ping->ping_count);
3986                 if (rc < 0)
3987                         return rc;
3988
3989                 mutex_lock(&the_lnet.ln_api_mutex);
3990                 lp = lnet_find_peer(ping->ping_id.nid);
3991                 if (lp) {
3992                         ping->ping_id.nid = lp->lp_primary_nid;
3993                         ping->mr_info = lnet_peer_is_multi_rail(lp);
3994                         lnet_peer_decref_locked(lp);
3995                 }
3996                 mutex_unlock(&the_lnet.ln_api_mutex);
3997
3998                 ping->ping_count = rc;
3999                 return 0;
4000         }
4001
4002         case IOC_LIBCFS_DISCOVER: {
4003                 struct lnet_ioctl_ping_data *discover = arg;
4004                 struct lnet_peer *lp;
4005
4006                 rc = lnet_discover(discover->ping_id, discover->op_param,
4007                                    discover->ping_buf,
4008                                    discover->ping_count);
4009                 if (rc < 0)
4010                         return rc;
4011
4012                 mutex_lock(&the_lnet.ln_api_mutex);
4013                 lp = lnet_find_peer(discover->ping_id.nid);
4014                 if (lp) {
4015                         discover->ping_id.nid = lp->lp_primary_nid;
4016                         discover->mr_info = lnet_peer_is_multi_rail(lp);
4017                         lnet_peer_decref_locked(lp);
4018                 }
4019                 mutex_unlock(&the_lnet.ln_api_mutex);
4020
4021                 discover->ping_count = rc;
4022                 return 0;
4023         }
4024
4025         default:
4026                 ni = lnet_net2ni_addref(data->ioc_net);
4027                 if (ni == NULL)
4028                         return -EINVAL;
4029
4030                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
4031                         rc = -EINVAL;
4032                 else
4033                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
4034
4035                 lnet_ni_decref(ni);
4036                 return rc;
4037         }
4038         /* not reached */
4039 }
4040 EXPORT_SYMBOL(LNetCtl);
4041
4042 void LNetDebugPeer(struct lnet_process_id id)
4043 {
4044         lnet_debug_peer(id.nid);
4045 }
4046 EXPORT_SYMBOL(LNetDebugPeer);
4047
4048 /**
4049  * Determine if the specified peer \a nid is on the local node.
4050  *
4051  * \param nid   peer nid to check
4052  *
4053  * \retval true         If peer NID is on the local node.
4054  * \retval false        If peer NID is not on the local node.
4055  */
4056 bool LNetIsPeerLocal(lnet_nid_t nid)
4057 {
4058         struct lnet_net *net;
4059         struct lnet_ni *ni;
4060         int cpt;
4061
4062         cpt = lnet_net_lock_current();
4063         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4064                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4065                         if (ni->ni_nid == nid) {
4066                                 lnet_net_unlock(cpt);
4067                                 return true;
4068                         }
4069                 }
4070         }
4071         lnet_net_unlock(cpt);
4072
4073         return false;
4074 }
4075 EXPORT_SYMBOL(LNetIsPeerLocal);
4076
4077 /**
4078  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
4079  * Note that all interfaces share a same PID, as requested by LNetNIInit().
4080  *
4081  * \param index Index of the interface to look up.
4082  * \param id On successful return, this location will hold the
4083  * struct lnet_process_id ID of the interface.
4084  *
4085  * \retval 0 If an interface exists at \a index.
4086  * \retval -ENOENT If no interface has been found.
4087  */
4088 int
4089 LNetGetId(unsigned int index, struct lnet_process_id *id)
4090 {
4091         struct lnet_ni   *ni;
4092         struct lnet_net  *net;
4093         int               cpt;
4094         int               rc = -ENOENT;
4095
4096         LASSERT(the_lnet.ln_refcount > 0);
4097
4098         cpt = lnet_net_lock_current();
4099
4100         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4101                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4102                         if (index-- != 0)
4103                                 continue;
4104
4105                         id->nid = ni->ni_nid;
4106                         id->pid = the_lnet.ln_pid;
4107                         rc = 0;
4108                         break;
4109                 }
4110         }
4111
4112         lnet_net_unlock(cpt);
4113         return rc;
4114 }
4115 EXPORT_SYMBOL(LNetGetId);
4116
4117 struct ping_data {
4118         int rc;
4119         int replied;
4120         struct lnet_handle_md mdh;
4121         struct completion completion;
4122 };
4123
4124 static void
4125 lnet_ping_event_handler(struct lnet_event *event)
4126 {
4127         struct ping_data *pd = event->md.user_ptr;
4128
4129         CDEBUG(D_NET, "ping event (%d %d)%s\n",
4130                event->type, event->status,
4131                event->unlinked ? " unlinked" : "");
4132
4133         if (event->status) {
4134                 if (!pd->rc)
4135                         pd->rc = event->status;
4136         } else if (event->type == LNET_EVENT_REPLY) {
4137                 pd->replied = 1;
4138                 pd->rc = event->mlength;
4139         }
4140         if (event->unlinked)
4141                 complete(&pd->completion);
4142 }
4143
4144 static int lnet_ping(struct lnet_process_id id, signed long timeout,
4145                      struct lnet_process_id __user *ids, int n_ids)
4146 {
4147         struct lnet_eq *eq;
4148         struct lnet_md md = { NULL };
4149         struct ping_data pd = { 0 };
4150         struct lnet_ping_buffer *pbuf;
4151         struct lnet_process_id tmpid;
4152         int i;
4153         int nob;
4154         int rc;
4155         int rc2;
4156
4157         /* n_ids limit is arbitrary */
4158         if (n_ids <= 0 || id.nid == LNET_NID_ANY)
4159                 return -EINVAL;
4160
4161         /*
4162          * if the user buffer has more space than the lnet_interfaces_max
4163          * then only fill it up to lnet_interfaces_max
4164          */
4165         if (n_ids > lnet_interfaces_max)
4166                 n_ids = lnet_interfaces_max;
4167
4168         if (id.pid == LNET_PID_ANY)
4169                 id.pid = LNET_PID_LUSTRE;
4170
4171         pbuf = lnet_ping_buffer_alloc(n_ids, GFP_NOFS);
4172         if (!pbuf)
4173                 return -ENOMEM;
4174
4175         eq = LNetEQAlloc(lnet_ping_event_handler);
4176         if (IS_ERR(eq)) {
4177                 rc = PTR_ERR(eq);
4178                 CERROR("Can't allocate EQ: %d\n", rc);
4179                 goto fail_ping_buffer_decref;
4180         }
4181
4182         /* initialize md content */
4183         md.start     = &pbuf->pb_info;
4184         md.length    = LNET_PING_INFO_SIZE(n_ids);
4185         md.threshold = 2; /* GET/REPLY */
4186         md.max_size  = 0;
4187         md.options   = LNET_MD_TRUNCATE;
4188         md.user_ptr  = &pd;
4189         md.eq_handle = eq;
4190
4191         init_completion(&pd.completion);
4192
4193         rc = LNetMDBind(md, LNET_UNLINK, &pd.mdh);
4194         if (rc != 0) {
4195                 CERROR("Can't bind MD: %d\n", rc);
4196                 goto fail_free_eq;
4197         }
4198
4199         rc = LNetGet(LNET_NID_ANY, pd.mdh, id,
4200                      LNET_RESERVED_PORTAL,
4201                      LNET_PROTO_PING_MATCHBITS, 0, false);
4202
4203         if (rc != 0) {
4204                 /* Don't CERROR; this could be deliberate! */
4205                 rc2 = LNetMDUnlink(pd.mdh);
4206                 LASSERT(rc2 == 0);
4207
4208                 /* NB must wait for the UNLINK event below... */
4209         }
4210
4211         if (wait_for_completion_timeout(&pd.completion, timeout) == 0) {
4212                 /* Ensure completion in finite time... */
4213                 LNetMDUnlink(pd.mdh);
4214                 wait_for_completion(&pd.completion);
4215         }
4216         if (!pd.replied) {
4217                 rc = -EIO;
4218                 goto fail_free_eq;
4219         }
4220
4221         nob = pd.rc;
4222         LASSERT(nob >= 0 && nob <= LNET_PING_INFO_SIZE(n_ids));
4223
4224         rc = -EPROTO;           /* if I can't parse... */
4225
4226         if (nob < 8) {
4227                 CERROR("%s: ping info too short %d\n",
4228                        libcfs_id2str(id), nob);
4229                 goto fail_free_eq;
4230         }
4231
4232         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
4233                 lnet_swap_pinginfo(pbuf);
4234         } else if (pbuf->pb_info.pi_magic != LNET_PROTO_PING_MAGIC) {
4235                 CERROR("%s: Unexpected magic %08x\n",
4236                        libcfs_id2str(id), pbuf->pb_info.pi_magic);
4237                 goto fail_free_eq;
4238         }
4239
4240         if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
4241                 CERROR("%s: ping w/o NI status: 0x%x\n",
4242                        libcfs_id2str(id), pbuf->pb_info.pi_features);
4243                 goto fail_free_eq;
4244         }
4245
4246         if (nob < LNET_PING_INFO_SIZE(0)) {
4247                 CERROR("%s: Short reply %d(%d min)\n",
4248                        libcfs_id2str(id),
4249                        nob, (int)LNET_PING_INFO_SIZE(0));
4250                 goto fail_free_eq;
4251         }
4252
4253         if (pbuf->pb_info.pi_nnis < n_ids)
4254                 n_ids = pbuf->pb_info.pi_nnis;
4255
4256         if (nob < LNET_PING_INFO_SIZE(n_ids)) {
4257                 CERROR("%s: Short reply %d(%d expected)\n",
4258                        libcfs_id2str(id),
4259                        nob, (int)LNET_PING_INFO_SIZE(n_ids));
4260                 goto fail_free_eq;
4261         }
4262
4263         rc = -EFAULT;           /* if I segv in copy_to_user()... */
4264
4265         memset(&tmpid, 0, sizeof(tmpid));
4266         for (i = 0; i < n_ids; i++) {
4267                 tmpid.pid = pbuf->pb_info.pi_pid;
4268                 tmpid.nid = pbuf->pb_info.pi_ni[i].ns_nid;
4269                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
4270                         goto fail_free_eq;
4271         }
4272         rc = pbuf->pb_info.pi_nnis;
4273
4274  fail_free_eq:
4275         rc2 = LNetEQFree(eq);
4276         if (rc2 != 0)
4277                 CERROR("rc2 %d\n", rc2);
4278         LASSERT(rc2 == 0);
4279
4280  fail_ping_buffer_decref:
4281         lnet_ping_buffer_decref(pbuf);
4282         return rc;
4283 }
4284
4285 static int
4286 lnet_discover(struct lnet_process_id id, __u32 force,
4287               struct lnet_process_id __user *ids, int n_ids)
4288 {
4289         struct lnet_peer_ni *lpni;
4290         struct lnet_peer_ni *p;
4291         struct lnet_peer *lp;
4292         struct lnet_process_id *buf;
4293         int cpt;
4294         int i;
4295         int rc;
4296         int max_intf = lnet_interfaces_max;
4297
4298         if (n_ids <= 0 ||
4299             id.nid == LNET_NID_ANY)
4300                 return -EINVAL;
4301
4302         if (id.pid == LNET_PID_ANY)
4303                 id.pid = LNET_PID_LUSTRE;
4304
4305         /*
4306          * if the user buffer has more space than the max_intf
4307          * then only fill it up to max_intf
4308          */
4309         if (n_ids > max_intf)
4310                 n_ids = max_intf;
4311
4312         CFS_ALLOC_PTR_ARRAY(buf, n_ids);
4313         if (!buf)
4314                 return -ENOMEM;
4315
4316         cpt = lnet_net_lock_current();
4317         lpni = lnet_nid2peerni_locked(id.nid, LNET_NID_ANY, cpt);
4318         if (IS_ERR(lpni)) {
4319                 rc = PTR_ERR(lpni);
4320                 goto out;
4321         }
4322
4323         /*
4324          * Clearing the NIDS_UPTODATE flag ensures the peer will
4325          * be discovered, provided discovery has not been disabled.
4326          */
4327         lp = lpni->lpni_peer_net->lpn_peer;
4328         spin_lock(&lp->lp_lock);
4329         lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
4330         /* If the force flag is set, force a PING and PUSH as well. */
4331         if (force)
4332                 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
4333         spin_unlock(&lp->lp_lock);
4334         rc = lnet_discover_peer_locked(lpni, cpt, true);
4335         if (rc)
4336                 goto out_decref;
4337
4338         /* Peer may have changed. */
4339         lp = lpni->lpni_peer_net->lpn_peer;
4340         if (lp->lp_nnis < n_ids)
4341                 n_ids = lp->lp_nnis;
4342
4343         i = 0;
4344         p = NULL;
4345         while ((p = lnet_get_next_peer_ni_locked(lp, NULL, p)) != NULL) {
4346                 buf[i].pid = id.pid;
4347                 buf[i].nid = p->lpni_nid;
4348                 if (++i >= n_ids)
4349                         break;
4350         }
4351
4352         lnet_net_unlock(cpt);
4353
4354         rc = -EFAULT;
4355         if (copy_to_user(ids, buf, n_ids * sizeof(*buf)))
4356                 goto out_relock;
4357         rc = n_ids;
4358 out_relock:
4359         lnet_net_lock(cpt);
4360 out_decref:
4361         lnet_peer_ni_decref_locked(lpni);
4362 out:
4363         lnet_net_unlock(cpt);
4364
4365         CFS_FREE_PTR_ARRAY(buf, n_ids);
4366
4367         return rc;
4368 }
4369
4370 /**
4371  * Retrieve peer discovery status.
4372  *
4373  * \retval 1 if lnet_peer_discovery_disabled is 0
4374  * \retval 0 if lnet_peer_discovery_disabled is 1
4375  */
4376 int
4377 LNetGetPeerDiscoveryStatus(void)
4378 {
4379         return !lnet_peer_discovery_disabled;
4380 }
4381 EXPORT_SYMBOL(LNetGetPeerDiscoveryStatus);