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 #define LNET_LND_TIMEOUT_DEFAULT ((LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT - 1) / \
 227                                   (LNET_RETRY_COUNT_HEALTH_DEFAULT + 1))
 228 unsigned int lnet_lnd_timeout = LNET_LND_TIMEOUT_DEFAULT;
 229 static void lnet_set_lnd_timeout(void)
 230 {
 231         lnet_lnd_timeout = (lnet_transaction_timeout - 1) /
 232                            (lnet_retry_count + 1);
 233 }
 234
 235 unsigned int lnet_current_net_count;
 236
 237 /*
 238  * This sequence number keeps track of how many times DLC was used to
 239  * update the local NIs. It is incremented when a NI is added or
 240  * removed and checked when sending a message to determine if there is
 241  * a need to re-run the selection algorithm. See lnet_select_pathway()
 242  * for more details on its usage.
 243  */
 244 static atomic_t lnet_dlc_seq_no = ATOMIC_INIT(0);
 245
 246 static int lnet_ping(struct lnet_process_id id, signed long timeout,
 247                      struct lnet_process_id __user *ids, int n_ids);
 248
 249 static int lnet_discover(struct lnet_process_id id, __u32 force,
 250                          struct lnet_process_id __user *ids, int n_ids);
 251
 252 static int
 253 sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
 254 {
 255         int rc;
 256         unsigned *sensitivity = (unsigned *)kp->arg;
 257         unsigned long value;
 258
 259         rc = kstrtoul(val, 0, &value);
 260         if (rc) {
 261                 CERROR("Invalid module parameter value for 'lnet_health_sensitivity'\n");
 262                 return rc;
 263         }
 264
 265         /*
 266          * The purpose of locking the api_mutex here is to ensure that
 267          * the correct value ends up stored properly.
 268          */
 269         mutex_lock(&the_lnet.ln_api_mutex);
 270
 271         if (value > LNET_MAX_HEALTH_VALUE) {
 272                 mutex_unlock(&the_lnet.ln_api_mutex);
 273                 CERROR("Invalid health value. Maximum: %d value = %lu\n",
 274                        LNET_MAX_HEALTH_VALUE, value);
 275                 return -EINVAL;
 276         }
 277
 278         /*
 279          * if we're turning on health then use the health timeout
 280          * defaults.
 281          */
 282         if (*sensitivity == 0 && value != 0) {
 283                 lnet_transaction_timeout = LNET_TRANSACTION_TIMEOUT_HEALTH_DEFAULT;
 284                 lnet_retry_count = LNET_RETRY_COUNT_HEALTH_DEFAULT;
 285                 lnet_set_lnd_timeout();
 286         /*
 287          * if we're turning off health then use the no health timeout
 288          * default.
 289          */
 290         } else if (*sensitivity != 0 && value == 0) {
 291                 lnet_transaction_timeout =
 292                         LNET_TRANSACTION_TIMEOUT_NO_HEALTH_DEFAULT;
 293                 lnet_retry_count = 0;
 294                 lnet_set_lnd_timeout();
 295         }
 296
 297         *sensitivity = value;
 298
 299         mutex_unlock(&the_lnet.ln_api_mutex);
 300
 301         return 0;
 302 }
 303
 304 static int
 305 recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp)
 306 {
 307         int rc;
 308         unsigned *interval = (unsigned *)kp->arg;
 309         unsigned long value;
 310
 311         rc = kstrtoul(val, 0, &value);
 312         if (rc) {
 313                 CERROR("Invalid module parameter value for 'lnet_recovery_interval'\n");
 314                 return rc;
 315         }
 316
 317         if (value < 1) {
 318                 CERROR("lnet_recovery_interval must be at least 1 second\n");
 319                 return -EINVAL;
 320         }
 321
 322         /*
 323          * The purpose of locking the api_mutex here is to ensure that
 324          * the correct value ends up stored properly.
 325          */
 326         mutex_lock(&the_lnet.ln_api_mutex);
 327
 328         *interval = value;
 329
 330         mutex_unlock(&the_lnet.ln_api_mutex);
 331
 332         return 0;
 333 }
 334
 335 static int
 336 discovery_set(const char *val, cfs_kernel_param_arg_t *kp)
 337 {
 338         int rc;
 339         unsigned *discovery_off = (unsigned *)kp->arg;
 340         unsigned long value;
 341         struct lnet_ping_buffer *pbuf;
 342
 343         rc = kstrtoul(val, 0, &value);
 344         if (rc) {
 345                 CERROR("Invalid module parameter value for 'lnet_peer_discovery_disabled'\n");
 346                 return rc;
 347         }
 348
 349         value = (value) ? 1 : 0;
 350
 351         /*
 352          * The purpose of locking the api_mutex here is to ensure that
 353          * the correct value ends up stored properly.
 354          */
 355         mutex_lock(&the_lnet.ln_api_mutex);
 356
 357         if (value == *discovery_off) {
 358                 mutex_unlock(&the_lnet.ln_api_mutex);
 359                 return 0;
 360         }
 361
 362         /*
 363          * We still want to set the discovery value even when LNet is not
 364          * running. This is the case when LNet is being loaded and we want
 365          * the module parameters to take effect. Otherwise if we're
 366          * changing the value dynamically, we want to set it after
 367          * updating the peers
 368          */
 369         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
 370                 *discovery_off = value;
 371                 mutex_unlock(&the_lnet.ln_api_mutex);
 372                 return 0;
 373         }
 374
 375         /* tell peers that discovery setting has changed */
 376         lnet_net_lock(LNET_LOCK_EX);
 377         pbuf = the_lnet.ln_ping_target;
 378         if (value)
 379                 pbuf->pb_info.pi_features &= ~LNET_PING_FEAT_DISCOVERY;
 380         else
 381                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
 382         lnet_net_unlock(LNET_LOCK_EX);
 383
 384         /* only send a push when we're turning off discovery */
 385         if (*discovery_off <= 0 && value > 0)
 386                 lnet_push_update_to_peers(1);
 387         *discovery_off = value;
 388
 389         mutex_unlock(&the_lnet.ln_api_mutex);
 390
 391         return 0;
 392 }
 393
 394 static int
 395 drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp)
 396 {
 397         int rc;
 398         unsigned int *drop_asym_route = (unsigned int *)kp->arg;
 399         unsigned long value;
 400
 401         rc = kstrtoul(val, 0, &value);
 402         if (rc) {
 403                 CERROR("Invalid module parameter value for "
 404                        "'lnet_drop_asym_route'\n");
 405                 return rc;
 406         }
 407
 408         /*
 409          * The purpose of locking the api_mutex here is to ensure that
 410          * the correct value ends up stored properly.
 411          */
 412         mutex_lock(&the_lnet.ln_api_mutex);
 413
 414         if (value == *drop_asym_route) {
 415                 mutex_unlock(&the_lnet.ln_api_mutex);
 416                 return 0;
 417         }
 418
 419         *drop_asym_route = value;
 420
 421         mutex_unlock(&the_lnet.ln_api_mutex);
 422
 423         return 0;
 424 }
 425
 426 static int
 427 transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp)
 428 {
 429         int rc;
 430         unsigned *transaction_to = (unsigned *)kp->arg;
 431         unsigned long value;
 432
 433         rc = kstrtoul(val, 0, &value);
 434         if (rc) {
 435                 CERROR("Invalid module parameter value for 'lnet_transaction_timeout'\n");
 436                 return rc;
 437         }
 438
 439         /*
 440          * The purpose of locking the api_mutex here is to ensure that
 441          * the correct value ends up stored properly.
 442          */
 443         mutex_lock(&the_lnet.ln_api_mutex);
 444
 445         if (value < lnet_retry_count || value == 0) {
 446                 mutex_unlock(&the_lnet.ln_api_mutex);
 447                 CERROR("Invalid value for lnet_transaction_timeout (%lu). "
 448                        "Has to be greater than lnet_retry_count (%u)\n",
 449                        value, lnet_retry_count);
 450                 return -EINVAL;
 451         }
 452
 453         if (value == *transaction_to) {
 454                 mutex_unlock(&the_lnet.ln_api_mutex);
 455                 return 0;
 456         }
 457
 458         *transaction_to = value;
 459         /* Update the lnet_lnd_timeout now that we've modified the
 460          * transaction timeout
 461          */
 462         lnet_set_lnd_timeout();
 463
 464         mutex_unlock(&the_lnet.ln_api_mutex);
 465
 466         return 0;
 467 }
 468
 469 static int
 470 retry_count_set(const char *val, cfs_kernel_param_arg_t *kp)
 471 {
 472         int rc;
 473         unsigned *retry_count = (unsigned *)kp->arg;
 474         unsigned long value;
 475
 476         rc = kstrtoul(val, 0, &value);
 477         if (rc) {
 478                 CERROR("Invalid module parameter value for 'lnet_retry_count'\n");
 479                 return rc;
 480         }
 481
 482         /*
 483          * The purpose of locking the api_mutex here is to ensure that
 484          * the correct value ends up stored properly.
 485          */
 486         mutex_lock(&the_lnet.ln_api_mutex);
 487
 488         if (lnet_health_sensitivity == 0) {
 489                 mutex_unlock(&the_lnet.ln_api_mutex);
 490                 CERROR("Can not set retry_count when health feature is turned off\n");
 491                 return -EINVAL;
 492         }
 493
 494         if (value > lnet_transaction_timeout) {
 495                 mutex_unlock(&the_lnet.ln_api_mutex);
 496                 CERROR("Invalid value for lnet_retry_count (%lu). "
 497                        "Has to be smaller than lnet_transaction_timeout (%u)\n",
 498                        value, lnet_transaction_timeout);
 499                 return -EINVAL;
 500         }
 501
 502         *retry_count = value;
 503
 504         /* Update the lnet_lnd_timeout now that we've modified the
 505          * retry count
 506          */
 507         lnet_set_lnd_timeout();
 508
 509         mutex_unlock(&the_lnet.ln_api_mutex);
 510
 511         return 0;
 512 }
 513
 514 static int
 515 intf_max_set(const char *val, cfs_kernel_param_arg_t *kp)
 516 {
 517         int value, rc;
 518
 519         rc = kstrtoint(val, 0, &value);
 520         if (rc) {
 521                 CERROR("Invalid module parameter value for 'lnet_interfaces_max'\n");
 522                 return rc;
 523         }
 524
 525         if (value < LNET_INTERFACES_MIN) {
 526                 CWARN("max interfaces provided are too small, setting to %d\n",
 527                       LNET_INTERFACES_MAX_DEFAULT);
 528                 value = LNET_INTERFACES_MAX_DEFAULT;
 529         }
 530
 531         *(int *)kp->arg = value;
 532
 533         return 0;
 534 }
 535
 536 static const char *
 537 lnet_get_routes(void)
 538 {
 539         return routes;
 540 }
 541
 542 static const char *
 543 lnet_get_networks(void)
 544 {
 545         const char *nets;
 546         int rc;
 547
 548         if (*networks != 0 && *ip2nets != 0) {
 549                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
 550                                    "'ip2nets' but not both at once\n");
 551                 return NULL;
 552         }
 553
 554         if (*ip2nets != 0) {
 555                 rc = lnet_parse_ip2nets(&nets, ip2nets);
 556                 return (rc == 0) ? nets : NULL;
 557         }
 558
 559         if (*networks != 0)
 560                 return networks;
 561
 562         return "tcp";
 563 }
 564
 565 static void
 566 lnet_init_locks(void)
 567 {
 568         spin_lock_init(&the_lnet.ln_eq_wait_lock);
 569         spin_lock_init(&the_lnet.ln_msg_resend_lock);
 570         init_completion(&the_lnet.ln_mt_wait_complete);
 571         mutex_init(&the_lnet.ln_lnd_mutex);
 572 }
 573
 574 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 575 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 576                                             *  MDs kmem_cache */
 577 struct kmem_cache *lnet_rspt_cachep;       /* response tracker cache */
 578 struct kmem_cache *lnet_msg_cachep;
 579
 580 static int
 581 lnet_slab_setup(void)
 582 {
 583         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 584          * allocated in <size-xxx> kmem_cache).
 585          */
 586         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(struct lnet_me),
 587                                             0, 0, NULL);
 588         if (!lnet_mes_cachep)
 589                 return -ENOMEM;
 590
 591         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 592                                                   LNET_SMALL_MD_SIZE, 0, 0,
 593                                                   NULL);
 594         if (!lnet_small_mds_cachep)
 595                 return -ENOMEM;
 596
 597         lnet_rspt_cachep = kmem_cache_create("lnet_rspt", sizeof(struct lnet_rsp_tracker),
 598                                             0, 0, NULL);
 599         if (!lnet_rspt_cachep)
 600                 return -ENOMEM;
 601
 602         lnet_msg_cachep = kmem_cache_create("lnet_msg", sizeof(struct lnet_msg),
 603                                             0, 0, NULL);
 604         if (!lnet_msg_cachep)
 605                 return -ENOMEM;
 606
 607         return 0;
 608 }
 609
 610 static void
 611 lnet_slab_cleanup(void)
 612 {
 613         if (lnet_msg_cachep) {
 614                 kmem_cache_destroy(lnet_msg_cachep);
 615                 lnet_msg_cachep = NULL;
 616         }
 617
 618
 619         if (lnet_rspt_cachep) {
 620                 kmem_cache_destroy(lnet_rspt_cachep);
 621                 lnet_rspt_cachep = NULL;
 622         }
 623
 624         if (lnet_small_mds_cachep) {
 625                 kmem_cache_destroy(lnet_small_mds_cachep);
 626                 lnet_small_mds_cachep = NULL;
 627         }
 628
 629         if (lnet_mes_cachep) {
 630                 kmem_cache_destroy(lnet_mes_cachep);
 631                 lnet_mes_cachep = NULL;
 632         }
 633 }
 634
 635 static int
 636 lnet_create_remote_nets_table(void)
 637 {
 638         int               i;
 639         struct list_head *hash;
 640
 641         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 642         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 643         CFS_ALLOC_PTR_ARRAY(hash, LNET_REMOTE_NETS_HASH_SIZE);
 644         if (hash == NULL) {
 645                 CERROR("Failed to create remote nets hash table\n");
 646                 return -ENOMEM;
 647         }
 648
 649         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 650                 INIT_LIST_HEAD(&hash[i]);
 651         the_lnet.ln_remote_nets_hash = hash;
 652         return 0;
 653 }
 654
 655 static void
 656 lnet_destroy_remote_nets_table(void)
 657 {
 658         int i;
 659
 660         if (the_lnet.ln_remote_nets_hash == NULL)
 661                 return;
 662
 663         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 664                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 665
 666         CFS_FREE_PTR_ARRAY(the_lnet.ln_remote_nets_hash,
 667                            LNET_REMOTE_NETS_HASH_SIZE);
 668         the_lnet.ln_remote_nets_hash = NULL;
 669 }
 670
 671 static void
 672 lnet_destroy_locks(void)
 673 {
 674         if (the_lnet.ln_res_lock != NULL) {
 675                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 676                 the_lnet.ln_res_lock = NULL;
 677         }
 678
 679         if (the_lnet.ln_net_lock != NULL) {
 680                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 681                 the_lnet.ln_net_lock = NULL;
 682         }
 683 }
 684
 685 static int
 686 lnet_create_locks(void)
 687 {
 688         lnet_init_locks();
 689
 690         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 691         if (the_lnet.ln_res_lock == NULL)
 692                 goto failed;
 693
 694         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 695         if (the_lnet.ln_net_lock == NULL)
 696                 goto failed;
 697
 698         return 0;
 699
 700  failed:
 701         lnet_destroy_locks();
 702         return -ENOMEM;
 703 }
 704
 705 static void lnet_assert_wire_constants(void)
 706 {
 707         /* Wire protocol assertions generated by 'wirecheck'
 708          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 709          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 710          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 711
 712         /* Constants... */
 713         BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
 714         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
 715         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
 716         BUILD_BUG_ON(LNET_MSG_ACK != 0);
 717         BUILD_BUG_ON(LNET_MSG_PUT != 1);
 718         BUILD_BUG_ON(LNET_MSG_GET != 2);
 719         BUILD_BUG_ON(LNET_MSG_REPLY != 3);
 720         BUILD_BUG_ON(LNET_MSG_HELLO != 4);
 721
 722         /* Checks for struct lnet_handle_wire */
 723         BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
 724         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 725                                    wh_interface_cookie) != 0);
 726         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
 727         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 728                                    wh_object_cookie) != 8);
 729         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
 730
 731         /* Checks for struct struct lnet_magicversion */
 732         BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
 733         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
 734         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
 735         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
 736         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
 737         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion,
 738                                    version_minor) != 6);
 739         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
 740
 741         /* Checks for struct struct lnet_hdr */
 742         BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
 743         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
 744         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
 745         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
 746         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
 747         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
 748         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
 749         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
 750         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
 751         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
 752         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
 753         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
 754         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
 755         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
 756         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
 757
 758         /* Ack */
 759         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
 760         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
 761         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
 762         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
 763         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
 764         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
 765
 766         /* Put */
 767         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
 768         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
 769         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
 770         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
 771         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
 772         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
 773         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
 774         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
 775         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
 776         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
 777
 778         /* Get */
 779         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
 780         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
 781         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
 782         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
 783         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
 784         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
 785         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
 786         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
 787         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
 788         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
 789
 790         /* Reply */
 791         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
 792         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
 793
 794         /* Hello */
 795         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
 796         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
 797         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
 798         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
 799
 800         /* Checks for struct lnet_ni_status and related constants */
 801         BUILD_BUG_ON(LNET_NI_STATUS_INVALID != 0x00000000);
 802         BUILD_BUG_ON(LNET_NI_STATUS_UP != 0x15aac0de);
 803         BUILD_BUG_ON(LNET_NI_STATUS_DOWN != 0xdeadface);
 804
 805         /* Checks for struct lnet_ni_status */
 806         BUILD_BUG_ON((int)sizeof(struct lnet_ni_status) != 16);
 807         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_nid) != 0);
 808         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_nid) != 8);
 809         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_status) != 8);
 810         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_status) != 4);
 811         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_unused) != 12);
 812         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_unused) != 4);
 813
 814         /* Checks for struct lnet_ping_info and related constants */
 815         BUILD_BUG_ON(LNET_PROTO_PING_MAGIC != 0x70696E67);
 816         BUILD_BUG_ON(LNET_PING_FEAT_INVAL != 0);
 817         BUILD_BUG_ON(LNET_PING_FEAT_BASE != 1);
 818         BUILD_BUG_ON(LNET_PING_FEAT_NI_STATUS != 2);
 819         BUILD_BUG_ON(LNET_PING_FEAT_RTE_DISABLED != 4);
 820         BUILD_BUG_ON(LNET_PING_FEAT_MULTI_RAIL != 8);
 821         BUILD_BUG_ON(LNET_PING_FEAT_DISCOVERY != 16);
 822         BUILD_BUG_ON(LNET_PING_FEAT_BITS != 31);
 823
 824         /* Checks for struct lnet_ping_info */
 825         BUILD_BUG_ON((int)sizeof(struct lnet_ping_info) != 16);
 826         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_magic) != 0);
 827         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_magic) != 4);
 828         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_features) != 4);
 829         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_features) != 4);
 830         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_pid) != 8);
 831         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_pid) != 4);
 832         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_nnis) != 12);
 833         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_nnis) != 4);
 834         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_ni) != 16);
 835         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_ni) != 0);
 836 }
 837
 838 static const struct lnet_lnd *lnet_find_lnd_by_type(__u32 type)
 839 {
 840         const struct lnet_lnd *lnd;
 841
 842         /* holding lnd mutex */
 843         if (type >= NUM_LNDS)
 844                 return NULL;
 845         lnd = the_lnet.ln_lnds[type];
 846         LASSERT(!lnd || lnd->lnd_type == type);
 847
 848         return lnd;
 849 }
 850
 851 unsigned int
 852 lnet_get_lnd_timeout(void)
 853 {
 854         return lnet_lnd_timeout;
 855 }
 856 EXPORT_SYMBOL(lnet_get_lnd_timeout);
 857
 858 void
 859 lnet_register_lnd(const struct lnet_lnd *lnd)
 860 {
 861         mutex_lock(&the_lnet.ln_lnd_mutex);
 862
 863         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 864         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 865
 866         the_lnet.ln_lnds[lnd->lnd_type] = lnd;
 867
 868         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 869
 870         mutex_unlock(&the_lnet.ln_lnd_mutex);
 871 }
 872 EXPORT_SYMBOL(lnet_register_lnd);
 873
 874 void
 875 lnet_unregister_lnd(const struct lnet_lnd *lnd)
 876 {
 877         mutex_lock(&the_lnet.ln_lnd_mutex);
 878
 879         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 880
 881         the_lnet.ln_lnds[lnd->lnd_type] = NULL;
 882         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 883
 884         mutex_unlock(&the_lnet.ln_lnd_mutex);
 885 }
 886 EXPORT_SYMBOL(lnet_unregister_lnd);
 887
 888 void
 889 lnet_counters_get_common(struct lnet_counters_common *common)
 890 {
 891         struct lnet_counters *ctr;
 892         int i;
 893
 894         memset(common, 0, sizeof(*common));
 895
 896         lnet_net_lock(LNET_LOCK_EX);
 897
 898         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 899                 common->lcc_msgs_max     += ctr->lct_common.lcc_msgs_max;
 900                 common->lcc_msgs_alloc   += ctr->lct_common.lcc_msgs_alloc;
 901                 common->lcc_errors       += ctr->lct_common.lcc_errors;
 902                 common->lcc_send_count   += ctr->lct_common.lcc_send_count;
 903                 common->lcc_recv_count   += ctr->lct_common.lcc_recv_count;
 904                 common->lcc_route_count  += ctr->lct_common.lcc_route_count;
 905                 common->lcc_drop_count   += ctr->lct_common.lcc_drop_count;
 906                 common->lcc_send_length  += ctr->lct_common.lcc_send_length;
 907                 common->lcc_recv_length  += ctr->lct_common.lcc_recv_length;
 908                 common->lcc_route_length += ctr->lct_common.lcc_route_length;
 909                 common->lcc_drop_length  += ctr->lct_common.lcc_drop_length;
 910         }
 911         lnet_net_unlock(LNET_LOCK_EX);
 912 }
 913 EXPORT_SYMBOL(lnet_counters_get_common);
 914
 915 void
 916 lnet_counters_get(struct lnet_counters *counters)
 917 {
 918         struct lnet_counters *ctr;
 919         struct lnet_counters_health *health = &counters->lct_health;
 920         int             i;
 921
 922         memset(counters, 0, sizeof(*counters));
 923
 924         lnet_counters_get_common(&counters->lct_common);
 925
 926         lnet_net_lock(LNET_LOCK_EX);
 927
 928         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 929                 health->lch_rst_alloc    += ctr->lct_health.lch_rst_alloc;
 930                 health->lch_resend_count += ctr->lct_health.lch_resend_count;
 931                 health->lch_response_timeout_count +=
 932                                 ctr->lct_health.lch_response_timeout_count;
 933                 health->lch_local_interrupt_count +=
 934                                 ctr->lct_health.lch_local_interrupt_count;
 935                 health->lch_local_dropped_count +=
 936                                 ctr->lct_health.lch_local_dropped_count;
 937                 health->lch_local_aborted_count +=
 938                                 ctr->lct_health.lch_local_aborted_count;
 939                 health->lch_local_no_route_count +=
 940                                 ctr->lct_health.lch_local_no_route_count;
 941                 health->lch_local_timeout_count +=
 942                                 ctr->lct_health.lch_local_timeout_count;
 943                 health->lch_local_error_count +=
 944                                 ctr->lct_health.lch_local_error_count;
 945                 health->lch_remote_dropped_count +=
 946                                 ctr->lct_health.lch_remote_dropped_count;
 947                 health->lch_remote_error_count +=
 948                                 ctr->lct_health.lch_remote_error_count;
 949                 health->lch_remote_timeout_count +=
 950                                 ctr->lct_health.lch_remote_timeout_count;
 951                 health->lch_network_timeout_count +=
 952                                 ctr->lct_health.lch_network_timeout_count;
 953         }
 954         lnet_net_unlock(LNET_LOCK_EX);
 955 }
 956 EXPORT_SYMBOL(lnet_counters_get);
 957
 958 void
 959 lnet_counters_reset(void)
 960 {
 961         struct lnet_counters *counters;
 962         int             i;
 963
 964         lnet_net_lock(LNET_LOCK_EX);
 965
 966         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 967                 memset(counters, 0, sizeof(struct lnet_counters));
 968
 969         lnet_net_unlock(LNET_LOCK_EX);
 970 }
 971
 972 static char *
 973 lnet_res_type2str(int type)
 974 {
 975         switch (type) {
 976         default:
 977                 LBUG();
 978         case LNET_COOKIE_TYPE_MD:
 979                 return "MD";
 980         case LNET_COOKIE_TYPE_ME:
 981                 return "ME";
 982         case LNET_COOKIE_TYPE_EQ:
 983                 return "EQ";
 984         }
 985 }
 986
 987 static void
 988 lnet_res_container_cleanup(struct lnet_res_container *rec)
 989 {
 990         int     count = 0;
 991
 992         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 993                 return;
 994
 995         while (!list_empty(&rec->rec_active)) {
 996                 struct list_head *e = rec->rec_active.next;
 997
 998                 list_del_init(e);
 999                 if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
1000                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
1001
1002                 } else { /* NB: Active MEs should be attached on portals */
1003                         LBUG();
1004                 }
1005                 count++;
1006         }
1007
1008         if (count > 0) {
1009                 /* Found alive MD/ME/EQ, user really should unlink/free
1010                  * all of them before finalize LNet, but if someone didn't,
1011                  * we have to recycle garbage for him */
1012                 CERROR("%d active elements on exit of %s container\n",
1013                        count, lnet_res_type2str(rec->rec_type));
1014         }
1015
1016         if (rec->rec_lh_hash != NULL) {
1017                 CFS_FREE_PTR_ARRAY(rec->rec_lh_hash, LNET_LH_HASH_SIZE);
1018                 rec->rec_lh_hash = NULL;
1019         }
1020
1021         rec->rec_type = 0; /* mark it as finalized */
1022 }
1023
1024 static int
1025 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
1026 {
1027         int     rc = 0;
1028         int     i;
1029
1030         LASSERT(rec->rec_type == 0);
1031
1032         rec->rec_type = type;
1033         INIT_LIST_HEAD(&rec->rec_active);
1034
1035         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
1036
1037         /* Arbitrary choice of hash table size */
1038         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
1039                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
1040         if (rec->rec_lh_hash == NULL) {
1041                 rc = -ENOMEM;
1042                 goto out;
1043         }
1044
1045         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
1046                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
1047
1048         return 0;
1049
1050 out:
1051         CERROR("Failed to setup %s resource container\n",
1052                lnet_res_type2str(type));
1053         lnet_res_container_cleanup(rec);
1054         return rc;
1055 }
1056
1057 static void
1058 lnet_res_containers_destroy(struct lnet_res_container **recs)
1059 {
1060         struct lnet_res_container       *rec;
1061         int                             i;
1062
1063         cfs_percpt_for_each(rec, i, recs)
1064                 lnet_res_container_cleanup(rec);
1065
1066         cfs_percpt_free(recs);
1067 }
1068
1069 static struct lnet_res_container **
1070 lnet_res_containers_create(int type)
1071 {
1072         struct lnet_res_container       **recs;
1073         struct lnet_res_container       *rec;
1074         int                             rc;
1075         int                             i;
1076
1077         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
1078         if (recs == NULL) {
1079                 CERROR("Failed to allocate %s resource containers\n",
1080                        lnet_res_type2str(type));
1081                 return NULL;
1082         }
1083
1084         cfs_percpt_for_each(rec, i, recs) {
1085                 rc = lnet_res_container_setup(rec, i, type);
1086                 if (rc != 0) {
1087                         lnet_res_containers_destroy(recs);
1088                         return NULL;
1089                 }
1090         }
1091
1092         return recs;
1093 }
1094
1095 struct lnet_libhandle *
1096 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
1097 {
1098         /* ALWAYS called with lnet_res_lock held */
1099         struct list_head        *head;
1100         struct lnet_libhandle   *lh;
1101         unsigned int            hash;
1102
1103         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
1104                 return NULL;
1105
1106         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
1107         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
1108
1109         list_for_each_entry(lh, head, lh_hash_chain) {
1110                 if (lh->lh_cookie == cookie)
1111                         return lh;
1112         }
1113
1114         return NULL;
1115 }
1116
1117 void
1118 lnet_res_lh_initialize(struct lnet_res_container *rec,
1119                        struct lnet_libhandle *lh)
1120 {
1121         /* ALWAYS called with lnet_res_lock held */
1122         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
1123         unsigned int    hash;
1124
1125         lh->lh_cookie = rec->rec_lh_cookie;
1126         rec->rec_lh_cookie += 1 << ibits;
1127
1128         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
1129
1130         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
1131 }
1132
1133 struct list_head **
1134 lnet_create_array_of_queues(void)
1135 {
1136         struct list_head **qs;
1137         struct list_head *q;
1138         int i;
1139
1140         qs = cfs_percpt_alloc(lnet_cpt_table(),
1141                               sizeof(struct list_head));
1142         if (!qs) {
1143                 CERROR("Failed to allocate queues\n");
1144                 return NULL;
1145         }
1146
1147         cfs_percpt_for_each(q, i, qs)
1148                 INIT_LIST_HEAD(q);
1149
1150         return qs;
1151 }
1152
1153 static int lnet_unprepare(void);
1154
1155 static int
1156 lnet_prepare(lnet_pid_t requested_pid)
1157 {
1158         /* Prepare to bring up the network */
1159         struct lnet_res_container **recs;
1160         int                       rc = 0;
1161
1162         if (requested_pid == LNET_PID_ANY) {
1163                 /* Don't instantiate LNET just for me */
1164                 return -ENETDOWN;
1165         }
1166
1167         LASSERT(the_lnet.ln_refcount == 0);
1168
1169         the_lnet.ln_routing = 0;
1170
1171         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
1172         the_lnet.ln_pid = requested_pid;
1173
1174         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
1175         INIT_LIST_HEAD(&the_lnet.ln_remote_peer_ni_list);
1176         INIT_LIST_HEAD(&the_lnet.ln_nets);
1177         INIT_LIST_HEAD(&the_lnet.ln_routers);
1178         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
1179         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
1180         INIT_LIST_HEAD(&the_lnet.ln_dc_request);
1181         INIT_LIST_HEAD(&the_lnet.ln_dc_working);
1182         INIT_LIST_HEAD(&the_lnet.ln_dc_expired);
1183         INIT_LIST_HEAD(&the_lnet.ln_mt_localNIRecovq);
1184         INIT_LIST_HEAD(&the_lnet.ln_mt_peerNIRecovq);
1185         init_waitqueue_head(&the_lnet.ln_dc_waitq);
1186         the_lnet.ln_mt_handler = NULL;
1187         init_completion(&the_lnet.ln_started);
1188
1189         rc = lnet_slab_setup();
1190         if (rc != 0)
1191                 goto failed;
1192
1193         rc = lnet_create_remote_nets_table();
1194         if (rc != 0)
1195                 goto failed;
1196
1197         /*
1198          * NB the interface cookie in wire handles guards against delayed
1199          * replies and ACKs appearing valid after reboot.
1200          */
1201         the_lnet.ln_interface_cookie = ktime_get_real_ns();
1202
1203         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
1204                                                 sizeof(struct lnet_counters));
1205         if (the_lnet.ln_counters == NULL) {
1206                 CERROR("Failed to allocate counters for LNet\n");
1207                 rc = -ENOMEM;
1208                 goto failed;
1209         }
1210
1211         rc = lnet_peer_tables_create();
1212         if (rc != 0)
1213                 goto failed;
1214
1215         rc = lnet_msg_containers_create();
1216         if (rc != 0)
1217                 goto failed;
1218
1219         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
1220                                       LNET_COOKIE_TYPE_EQ);
1221         if (rc != 0)
1222                 goto failed;
1223
1224         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
1225         if (recs == NULL) {
1226                 rc = -ENOMEM;
1227                 goto failed;
1228         }
1229
1230         the_lnet.ln_md_containers = recs;
1231
1232         rc = lnet_portals_create();
1233         if (rc != 0) {
1234                 CERROR("Failed to create portals for LNet: %d\n", rc);
1235                 goto failed;
1236         }
1237
1238         the_lnet.ln_mt_zombie_rstqs = lnet_create_array_of_queues();
1239         if (!the_lnet.ln_mt_zombie_rstqs) {
1240                 rc = -ENOMEM;
1241                 goto failed;
1242         }
1243
1244         return 0;
1245
1246  failed:
1247         lnet_unprepare();
1248         return rc;
1249 }
1250
1251 static int
1252 lnet_unprepare (void)
1253 {
1254         /* NB no LNET_LOCK since this is the last reference.  All LND instances
1255          * have shut down already, so it is safe to unlink and free all
1256          * descriptors, even those that appear committed to a network op (eg MD
1257          * with non-zero pending count) */
1258
1259         lnet_fail_nid(LNET_NID_ANY, 0);
1260
1261         LASSERT(the_lnet.ln_refcount == 0);
1262         LASSERT(list_empty(&the_lnet.ln_test_peers));
1263         LASSERT(list_empty(&the_lnet.ln_nets));
1264
1265         if (the_lnet.ln_mt_zombie_rstqs) {
1266                 lnet_clean_zombie_rstqs();
1267                 the_lnet.ln_mt_zombie_rstqs = NULL;
1268         }
1269
1270         lnet_assert_handler_unused(the_lnet.ln_mt_handler);
1271         the_lnet.ln_mt_handler = NULL;
1272
1273         lnet_portals_destroy();
1274
1275         if (the_lnet.ln_md_containers != NULL) {
1276                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
1277                 the_lnet.ln_md_containers = NULL;
1278         }
1279
1280         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
1281
1282         lnet_msg_containers_destroy();
1283         lnet_peer_uninit();
1284         lnet_rtrpools_free(0);
1285
1286         if (the_lnet.ln_counters != NULL) {
1287                 cfs_percpt_free(the_lnet.ln_counters);
1288                 the_lnet.ln_counters = NULL;
1289         }
1290         lnet_destroy_remote_nets_table();
1291         lnet_slab_cleanup();
1292
1293         return 0;
1294 }
1295
1296 struct lnet_ni  *
1297 lnet_net2ni_locked(__u32 net_id, int cpt)
1298 {
1299         struct lnet_ni   *ni;
1300         struct lnet_net  *net;
1301
1302         LASSERT(cpt != LNET_LOCK_EX);
1303
1304         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1305                 if (net->net_id == net_id) {
1306                         ni = list_entry(net->net_ni_list.next, struct lnet_ni,
1307                                         ni_netlist);
1308                         return ni;
1309                 }
1310         }
1311
1312         return NULL;
1313 }
1314
1315 struct lnet_ni *
1316 lnet_net2ni_addref(__u32 net)
1317 {
1318         struct lnet_ni *ni;
1319
1320         lnet_net_lock(0);
1321         ni = lnet_net2ni_locked(net, 0);
1322         if (ni)
1323                 lnet_ni_addref_locked(ni, 0);
1324         lnet_net_unlock(0);
1325
1326         return ni;
1327 }
1328 EXPORT_SYMBOL(lnet_net2ni_addref);
1329
1330 struct lnet_net *
1331 lnet_get_net_locked(__u32 net_id)
1332 {
1333         struct lnet_net  *net;
1334
1335         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1336                 if (net->net_id == net_id)
1337                         return net;
1338         }
1339
1340         return NULL;
1341 }
1342
1343 unsigned int
1344 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
1345 {
1346         __u64           key = nid;
1347         unsigned int    val;
1348
1349         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
1350
1351         if (number == 1)
1352                 return 0;
1353
1354         val = hash_long(key, LNET_CPT_BITS);
1355         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
1356         if (val < number)
1357                 return val;
1358
1359         return (unsigned int)(key + val + (val >> 1)) % number;
1360 }
1361
1362 int
1363 lnet_cpt_of_nid_locked(lnet_nid_t nid, struct lnet_ni *ni)
1364 {
1365         struct lnet_net *net;
1366
1367         /* must called with hold of lnet_net_lock */
1368         if (LNET_CPT_NUMBER == 1)
1369                 return 0; /* the only one */
1370
1371         /*
1372          * If NI is provided then use the CPT identified in the NI cpt
1373          * list if one exists. If one doesn't exist, then that NI is
1374          * associated with all CPTs and it follows that the net it belongs
1375          * to is implicitly associated with all CPTs, so just hash the nid
1376          * and return that.
1377          */
1378         if (ni != NULL) {
1379                 if (ni->ni_cpts != NULL)
1380                         return ni->ni_cpts[lnet_nid_cpt_hash(nid,
1381                                                              ni->ni_ncpts)];
1382                 else
1383                         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1384         }
1385
1386         /* no NI provided so look at the net */
1387         net = lnet_get_net_locked(LNET_NIDNET(nid));
1388
1389         if (net != NULL && net->net_cpts != NULL) {
1390                 return net->net_cpts[lnet_nid_cpt_hash(nid, net->net_ncpts)];
1391         }
1392
1393         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1394 }
1395
1396 int
1397 lnet_cpt_of_nid(lnet_nid_t nid, struct lnet_ni *ni)
1398 {
1399         int     cpt;
1400         int     cpt2;
1401
1402         if (LNET_CPT_NUMBER == 1)
1403                 return 0; /* the only one */
1404
1405         cpt = lnet_net_lock_current();
1406
1407         cpt2 = lnet_cpt_of_nid_locked(nid, ni);
1408
1409         lnet_net_unlock(cpt);
1410
1411         return cpt2;
1412 }
1413 EXPORT_SYMBOL(lnet_cpt_of_nid);
1414
1415 int
1416 lnet_islocalnet_locked(__u32 net_id)
1417 {
1418         struct lnet_net *net;
1419         bool local;
1420
1421         net = lnet_get_net_locked(net_id);
1422
1423         local = net != NULL;
1424
1425         return local;
1426 }
1427
1428 int
1429 lnet_islocalnet(__u32 net_id)
1430 {
1431         int cpt;
1432         bool local;
1433
1434         cpt = lnet_net_lock_current();
1435
1436         local = lnet_islocalnet_locked(net_id);
1437
1438         lnet_net_unlock(cpt);
1439
1440         return local;
1441 }
1442
1443 struct lnet_ni  *
1444 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
1445 {
1446         struct lnet_net  *net;
1447         struct lnet_ni   *ni;
1448
1449         LASSERT(cpt != LNET_LOCK_EX);
1450
1451         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1452                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1453                         if (ni->ni_nid == nid)
1454                                 return ni;
1455                 }
1456         }
1457
1458         return NULL;
1459 }
1460
1461 struct lnet_ni *
1462 lnet_nid2ni_addref(lnet_nid_t nid)
1463 {
1464         struct lnet_ni *ni;
1465
1466         lnet_net_lock(0);
1467         ni = lnet_nid2ni_locked(nid, 0);
1468         if (ni)
1469                 lnet_ni_addref_locked(ni, 0);
1470         lnet_net_unlock(0);
1471
1472         return ni;
1473 }
1474 EXPORT_SYMBOL(lnet_nid2ni_addref);
1475
1476 int
1477 lnet_islocalnid(lnet_nid_t nid)
1478 {
1479         struct lnet_ni  *ni;
1480         int             cpt;
1481
1482         cpt = lnet_net_lock_current();
1483         ni = lnet_nid2ni_locked(nid, cpt);
1484         lnet_net_unlock(cpt);
1485
1486         return ni != NULL;
1487 }
1488
1489 int
1490 lnet_count_acceptor_nets(void)
1491 {
1492         /* Return the # of NIs that need the acceptor. */
1493         int              count = 0;
1494         struct lnet_net  *net;
1495         int              cpt;
1496
1497         cpt = lnet_net_lock_current();
1498         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1499                 /* all socklnd type networks should have the acceptor
1500                  * thread started */
1501                 if (net->net_lnd->lnd_accept != NULL)
1502                         count++;
1503         }
1504
1505         lnet_net_unlock(cpt);
1506
1507         return count;
1508 }
1509
1510 struct lnet_ping_buffer *
1511 lnet_ping_buffer_alloc(int nnis, gfp_t gfp)
1512 {
1513         struct lnet_ping_buffer *pbuf;
1514
1515         LIBCFS_ALLOC_GFP(pbuf, LNET_PING_BUFFER_SIZE(nnis), gfp);
1516         if (pbuf) {
1517                 pbuf->pb_nnis = nnis;
1518                 pbuf->pb_needs_post = false;
1519                 atomic_set(&pbuf->pb_refcnt, 1);
1520         }
1521
1522         return pbuf;
1523 }
1524
1525 void
1526 lnet_ping_buffer_free(struct lnet_ping_buffer *pbuf)
1527 {
1528         LASSERT(atomic_read(&pbuf->pb_refcnt) == 0);
1529         LIBCFS_FREE(pbuf, LNET_PING_BUFFER_SIZE(pbuf->pb_nnis));
1530 }
1531
1532 static struct lnet_ping_buffer *
1533 lnet_ping_target_create(int nnis)
1534 {
1535         struct lnet_ping_buffer *pbuf;
1536
1537         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1538         if (pbuf == NULL) {
1539                 CERROR("Can't allocate ping source [%d]\n", nnis);
1540                 return NULL;
1541         }
1542
1543         pbuf->pb_info.pi_nnis = nnis;
1544         pbuf->pb_info.pi_pid = the_lnet.ln_pid;
1545         pbuf->pb_info.pi_magic = LNET_PROTO_PING_MAGIC;
1546         pbuf->pb_info.pi_features =
1547                 LNET_PING_FEAT_NI_STATUS | LNET_PING_FEAT_MULTI_RAIL;
1548
1549         return pbuf;
1550 }
1551
1552 static inline int
1553 lnet_get_net_ni_count_locked(struct lnet_net *net)
1554 {
1555         struct lnet_ni  *ni;
1556         int             count = 0;
1557
1558         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1559                 count++;
1560
1561         return count;
1562 }
1563
1564 static inline int
1565 lnet_get_net_ni_count_pre(struct lnet_net *net)
1566 {
1567         struct lnet_ni  *ni;
1568         int             count = 0;
1569
1570         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
1571                 count++;
1572
1573         return count;
1574 }
1575
1576 static inline int
1577 lnet_get_ni_count(void)
1578 {
1579         struct lnet_ni  *ni;
1580         struct lnet_net *net;
1581         int             count = 0;
1582
1583         lnet_net_lock(0);
1584
1585         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1586                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1587                         count++;
1588         }
1589
1590         lnet_net_unlock(0);
1591
1592         return count;
1593 }
1594
1595 int
1596 lnet_get_net_count(void)
1597 {
1598         struct lnet_net *net;
1599         int count = 0;
1600
1601         lnet_net_lock(0);
1602
1603         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1604                 count++;
1605         }
1606
1607         lnet_net_unlock(0);
1608
1609         return count;
1610 }
1611
1612 void
1613 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
1614 {
1615         struct lnet_ni_status *stat;
1616         int nnis;
1617         int i;
1618
1619         __swab32s(&pbuf->pb_info.pi_magic);
1620         __swab32s(&pbuf->pb_info.pi_features);
1621         __swab32s(&pbuf->pb_info.pi_pid);
1622         __swab32s(&pbuf->pb_info.pi_nnis);
1623         nnis = pbuf->pb_info.pi_nnis;
1624         if (nnis > pbuf->pb_nnis)
1625                 nnis = pbuf->pb_nnis;
1626         for (i = 0; i < nnis; i++) {
1627                 stat = &pbuf->pb_info.pi_ni[i];
1628                 __swab64s(&stat->ns_nid);
1629                 __swab32s(&stat->ns_status);
1630         }
1631 }
1632
1633 int
1634 lnet_ping_info_validate(struct lnet_ping_info *pinfo)
1635 {
1636         if (!pinfo)
1637                 return -EINVAL;
1638         if (pinfo->pi_magic != LNET_PROTO_PING_MAGIC)
1639                 return -EPROTO;
1640         if (!(pinfo->pi_features & LNET_PING_FEAT_NI_STATUS))
1641                 return -EPROTO;
1642         /* Loopback is guaranteed to be present */
1643         if (pinfo->pi_nnis < 1 || pinfo->pi_nnis > lnet_interfaces_max)
1644                 return -ERANGE;
1645         if (LNET_PING_INFO_LONI(pinfo) != LNET_NID_LO_0)
1646                 return -EPROTO;
1647         return 0;
1648 }
1649
1650 static void
1651 lnet_ping_target_destroy(void)
1652 {
1653         struct lnet_net *net;
1654         struct lnet_ni  *ni;
1655
1656         lnet_net_lock(LNET_LOCK_EX);
1657
1658         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1659                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1660                         lnet_ni_lock(ni);
1661                         ni->ni_status = NULL;
1662                         lnet_ni_unlock(ni);
1663                 }
1664         }
1665
1666         lnet_ping_buffer_decref(the_lnet.ln_ping_target);
1667         the_lnet.ln_ping_target = NULL;
1668
1669         lnet_net_unlock(LNET_LOCK_EX);
1670 }
1671
1672 static void
1673 lnet_ping_target_event_handler(struct lnet_event *event)
1674 {
1675         struct lnet_ping_buffer *pbuf = event->md_user_ptr;
1676
1677         if (event->unlinked)
1678                 lnet_ping_buffer_decref(pbuf);
1679 }
1680
1681 static int
1682 lnet_ping_target_setup(struct lnet_ping_buffer **ppbuf,
1683                        struct lnet_handle_md *ping_mdh,
1684                        int ni_count, bool set_eq)
1685 {
1686         struct lnet_process_id id = {
1687                 .nid = LNET_NID_ANY,
1688                 .pid = LNET_PID_ANY
1689         };
1690         struct lnet_me *me;
1691         struct lnet_md md = { NULL };
1692         int rc;
1693
1694         if (set_eq)
1695                 the_lnet.ln_ping_target_handler =
1696                         lnet_ping_target_event_handler;
1697
1698         *ppbuf = lnet_ping_target_create(ni_count);
1699         if (*ppbuf == NULL) {
1700                 rc = -ENOMEM;
1701                 goto fail_free_eq;
1702         }
1703
1704         /* Ping target ME/MD */
1705         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1706                           LNET_PROTO_PING_MATCHBITS, 0,
1707                           LNET_UNLINK, LNET_INS_AFTER);
1708         if (IS_ERR(me)) {
1709                 rc = PTR_ERR(me);
1710                 CERROR("Can't create ping target ME: %d\n", rc);
1711                 goto fail_decref_ping_buffer;
1712         }
1713
1714         /* initialize md content */
1715         md.start     = &(*ppbuf)->pb_info;
1716         md.length    = LNET_PING_INFO_SIZE((*ppbuf)->pb_nnis);
1717         md.threshold = LNET_MD_THRESH_INF;
1718         md.max_size  = 0;
1719         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1720                        LNET_MD_MANAGE_REMOTE;
1721         md.handler   = the_lnet.ln_ping_target_handler;
1722         md.user_ptr  = *ppbuf;
1723
1724         rc = LNetMDAttach(me, &md, LNET_RETAIN, ping_mdh);
1725         if (rc != 0) {
1726                 CERROR("Can't attach ping target MD: %d\n", rc);
1727                 goto fail_unlink_ping_me;
1728         }
1729         lnet_ping_buffer_addref(*ppbuf);
1730
1731         return 0;
1732
1733 fail_unlink_ping_me:
1734         LNetMEUnlink(me);
1735 fail_decref_ping_buffer:
1736         LASSERT(atomic_read(&(*ppbuf)->pb_refcnt) == 1);
1737         lnet_ping_buffer_decref(*ppbuf);
1738         *ppbuf = NULL;
1739 fail_free_eq:
1740         return rc;
1741 }
1742
1743 static void
1744 lnet_ping_md_unlink(struct lnet_ping_buffer *pbuf,
1745                     struct lnet_handle_md *ping_mdh)
1746 {
1747         LNetMDUnlink(*ping_mdh);
1748         LNetInvalidateMDHandle(ping_mdh);
1749
1750         /* NB the MD could be busy; this just starts the unlink */
1751         wait_var_event_warning(&pbuf->pb_refcnt,
1752                                atomic_read(&pbuf->pb_refcnt) <= 1,
1753                                "Still waiting for ping data MD to unlink\n");
1754 }
1755
1756 static void
1757 lnet_ping_target_install_locked(struct lnet_ping_buffer *pbuf)
1758 {
1759         struct lnet_ni          *ni;
1760         struct lnet_net         *net;
1761         struct lnet_ni_status *ns;
1762         int                     i;
1763         int                     rc;
1764
1765         i = 0;
1766         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1767                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1768                         LASSERT(i < pbuf->pb_nnis);
1769
1770                         ns = &pbuf->pb_info.pi_ni[i];
1771
1772                         ns->ns_nid = ni->ni_nid;
1773
1774                         lnet_ni_lock(ni);
1775                         ns->ns_status = (ni->ni_status != NULL) ?
1776                                          ni->ni_status->ns_status :
1777                                                 LNET_NI_STATUS_UP;
1778                         ni->ni_status = ns;
1779                         lnet_ni_unlock(ni);
1780
1781                         i++;
1782                 }
1783         }
1784         /*
1785          * We (ab)use the ns_status of the loopback interface to
1786          * transmit the sequence number. The first interface listed
1787          * must be the loopback interface.
1788          */
1789         rc = lnet_ping_info_validate(&pbuf->pb_info);
1790         if (rc) {
1791                 LCONSOLE_EMERG("Invalid ping target: %d\n", rc);
1792                 LBUG();
1793         }
1794         LNET_PING_BUFFER_SEQNO(pbuf) =
1795                 atomic_inc_return(&the_lnet.ln_ping_target_seqno);
1796 }
1797
1798 static void
1799 lnet_ping_target_update(struct lnet_ping_buffer *pbuf,
1800                         struct lnet_handle_md ping_mdh)
1801 {
1802         struct lnet_ping_buffer *old_pbuf = NULL;
1803         struct lnet_handle_md old_ping_md;
1804
1805         /* switch the NIs to point to the new ping info created */
1806         lnet_net_lock(LNET_LOCK_EX);
1807
1808         if (!the_lnet.ln_routing)
1809                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1810         if (!lnet_peer_discovery_disabled)
1811                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
1812
1813         /* Ensure only known feature bits have been set. */
1814         LASSERT(pbuf->pb_info.pi_features & LNET_PING_FEAT_BITS);
1815         LASSERT(!(pbuf->pb_info.pi_features & ~LNET_PING_FEAT_BITS));
1816
1817         lnet_ping_target_install_locked(pbuf);
1818
1819         if (the_lnet.ln_ping_target) {
1820                 old_pbuf = the_lnet.ln_ping_target;
1821                 old_ping_md = the_lnet.ln_ping_target_md;
1822         }
1823         the_lnet.ln_ping_target_md = ping_mdh;
1824         the_lnet.ln_ping_target = pbuf;
1825
1826         lnet_net_unlock(LNET_LOCK_EX);
1827
1828         if (old_pbuf) {
1829                 /* unlink and free the old ping info */
1830                 lnet_ping_md_unlink(old_pbuf, &old_ping_md);
1831                 lnet_ping_buffer_decref(old_pbuf);
1832         }
1833
1834         lnet_push_update_to_peers(0);
1835 }
1836
1837 static void
1838 lnet_ping_target_fini(void)
1839 {
1840         lnet_ping_md_unlink(the_lnet.ln_ping_target,
1841                             &the_lnet.ln_ping_target_md);
1842
1843         lnet_assert_handler_unused(the_lnet.ln_ping_target_handler);
1844         lnet_ping_target_destroy();
1845 }
1846
1847 /* Resize the push target. */
1848 int lnet_push_target_resize(void)
1849 {
1850         struct lnet_handle_md mdh;
1851         struct lnet_handle_md old_mdh;
1852         struct lnet_ping_buffer *pbuf;
1853         struct lnet_ping_buffer *old_pbuf;
1854         int nnis;
1855         int rc;
1856
1857 again:
1858         nnis = the_lnet.ln_push_target_nnis;
1859         if (nnis <= 0) {
1860                 CDEBUG(D_NET, "Invalid nnis %d\n", nnis);
1861                 return -EINVAL;
1862         }
1863
1864         /* NB: lnet_ping_buffer_alloc() sets pbuf refcount to 1. That ref is
1865          * dropped when we need to resize again (see "old_pbuf" below) or when
1866          * LNet is shutdown (see lnet_push_target_fini())
1867          */
1868         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1869         if (!pbuf) {
1870                 CDEBUG(D_NET, "Can't allocate pbuf for nnis %d\n", nnis);
1871                 return -ENOMEM;
1872         }
1873
1874         rc = lnet_push_target_post(pbuf, &mdh);
1875         if (rc) {
1876                 CDEBUG(D_NET, "Failed to post push target: %d\n", rc);
1877                 lnet_ping_buffer_decref(pbuf);
1878                 return rc;
1879         }
1880
1881         lnet_net_lock(LNET_LOCK_EX);
1882         old_pbuf = the_lnet.ln_push_target;
1883         old_mdh = the_lnet.ln_push_target_md;
1884         the_lnet.ln_push_target = pbuf;
1885         the_lnet.ln_push_target_md = mdh;
1886         lnet_net_unlock(LNET_LOCK_EX);
1887
1888         if (old_pbuf) {
1889                 LNetMDUnlink(old_mdh);
1890                 /* Drop ref set by lnet_ping_buffer_alloc() */
1891                 lnet_ping_buffer_decref(old_pbuf);
1892         }
1893
1894         /* Received another push or reply that requires a larger buffer */
1895         if (nnis < the_lnet.ln_push_target_nnis)
1896                 goto again;
1897
1898         CDEBUG(D_NET, "nnis %d success\n", nnis);
1899         return 0;
1900 }
1901
1902 int lnet_push_target_post(struct lnet_ping_buffer *pbuf,
1903                           struct lnet_handle_md *mdhp)
1904 {
1905         struct lnet_process_id id = { LNET_NID_ANY, LNET_PID_ANY };
1906         struct lnet_md md = { NULL };
1907         struct lnet_me *me;
1908         int rc;
1909
1910         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1911                           LNET_PROTO_PING_MATCHBITS, 0,
1912                           LNET_UNLINK, LNET_INS_AFTER);
1913         if (IS_ERR(me)) {
1914                 rc = PTR_ERR(me);
1915                 CERROR("Can't create push target ME: %d\n", rc);
1916                 return rc;
1917         }
1918
1919         pbuf->pb_needs_post = false;
1920
1921         /* This reference is dropped by lnet_push_target_event_handler() */
1922         lnet_ping_buffer_addref(pbuf);
1923
1924         /* initialize md content */
1925         md.start     = &pbuf->pb_info;
1926         md.length    = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
1927         md.threshold = 1;
1928         md.max_size  = 0;
1929         md.options   = LNET_MD_OP_PUT | LNET_MD_TRUNCATE;
1930         md.user_ptr  = pbuf;
1931         md.handler   = the_lnet.ln_push_target_handler;
1932
1933         rc = LNetMDAttach(me, &md, LNET_UNLINK, mdhp);
1934         if (rc) {
1935                 CERROR("Can't attach push MD: %d\n", rc);
1936                 LNetMEUnlink(me);
1937                 lnet_ping_buffer_decref(pbuf);
1938                 pbuf->pb_needs_post = true;
1939                 return rc;
1940         }
1941
1942         CDEBUG(D_NET, "posted push target %p\n", pbuf);
1943
1944         return 0;
1945 }
1946
1947 static void lnet_push_target_event_handler(struct lnet_event *ev)
1948 {
1949         struct lnet_ping_buffer *pbuf = ev->md_user_ptr;
1950
1951         CDEBUG(D_NET, "type %d status %d unlinked %d\n", ev->type, ev->status,
1952                ev->unlinked);
1953
1954         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
1955                 lnet_swap_pinginfo(pbuf);
1956
1957         if (ev->type == LNET_EVENT_UNLINK) {
1958                 /* Drop ref added by lnet_push_target_post() */
1959                 lnet_ping_buffer_decref(pbuf);
1960                 return;
1961         }
1962
1963         lnet_peer_push_event(ev);
1964         if (ev->unlinked)
1965                 /* Drop ref added by lnet_push_target_post */
1966                 lnet_ping_buffer_decref(pbuf);
1967 }
1968
1969 /* Initialize the push target. */
1970 static int lnet_push_target_init(void)
1971 {
1972         int rc;
1973
1974         if (the_lnet.ln_push_target)
1975                 return -EALREADY;
1976
1977         the_lnet.ln_push_target_handler =
1978                 lnet_push_target_event_handler;
1979
1980         rc = LNetSetLazyPortal(LNET_RESERVED_PORTAL);
1981         LASSERT(rc == 0);
1982
1983         /* Start at the required minimum, we'll enlarge if required. */
1984         the_lnet.ln_push_target_nnis = LNET_INTERFACES_MIN;
1985
1986         rc = lnet_push_target_resize();
1987
1988         if (rc) {
1989                 LNetClearLazyPortal(LNET_RESERVED_PORTAL);
1990                 the_lnet.ln_push_target_handler = NULL;
1991         }
1992
1993         return rc;
1994 }
1995
1996 /* Clean up the push target. */
1997 static void lnet_push_target_fini(void)
1998 {
1999         if (!the_lnet.ln_push_target)
2000                 return;
2001
2002         /* Unlink and invalidate to prevent new references. */
2003         LNetMDUnlink(the_lnet.ln_push_target_md);
2004         LNetInvalidateMDHandle(&the_lnet.ln_push_target_md);
2005
2006         /* Wait for the unlink to complete. */
2007         wait_var_event_warning(&the_lnet.ln_push_target->pb_refcnt,
2008                                atomic_read(&the_lnet.ln_push_target->pb_refcnt) <= 1,
2009                                "Still waiting for ping data MD to unlink\n");
2010
2011         /* Drop ref set by lnet_ping_buffer_alloc() */
2012         lnet_ping_buffer_decref(the_lnet.ln_push_target);
2013         the_lnet.ln_push_target = NULL;
2014         the_lnet.ln_push_target_nnis = 0;
2015
2016         LNetClearLazyPortal(LNET_RESERVED_PORTAL);
2017         lnet_assert_handler_unused(the_lnet.ln_push_target_handler);
2018         the_lnet.ln_push_target_handler = NULL;
2019 }
2020
2021 static int
2022 lnet_ni_tq_credits(struct lnet_ni *ni)
2023 {
2024         int     credits;
2025
2026         LASSERT(ni->ni_ncpts >= 1);
2027
2028         if (ni->ni_ncpts == 1)
2029                 return ni->ni_net->net_tunables.lct_max_tx_credits;
2030
2031         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
2032         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
2033         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
2034
2035         return credits;
2036 }
2037
2038 static void
2039 lnet_ni_unlink_locked(struct lnet_ni *ni)
2040 {
2041         /* move it to zombie list and nobody can find it anymore */
2042         LASSERT(!list_empty(&ni->ni_netlist));
2043         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
2044         lnet_ni_decref_locked(ni, 0);
2045 }
2046
2047 static void
2048 lnet_clear_zombies_nis_locked(struct lnet_net *net)
2049 {
2050         int             i;
2051         int             islo;
2052         struct lnet_ni  *ni;
2053         struct list_head *zombie_list = &net->net_ni_zombie;
2054
2055         /*
2056          * Now wait for the NIs I just nuked to show up on the zombie
2057          * list and shut them down in guaranteed thread context
2058          */
2059         i = 2;
2060         while (!list_empty(zombie_list)) {
2061                 int     *ref;
2062                 int     j;
2063
2064                 ni = list_entry(zombie_list->next,
2065                                 struct lnet_ni, ni_netlist);
2066                 list_del_init(&ni->ni_netlist);
2067                 /* the ni should be in deleting state. If it's not it's
2068                  * a bug */
2069                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
2070                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
2071                         if (*ref == 0)
2072                                 continue;
2073                         /* still busy, add it back to zombie list */
2074                         list_add(&ni->ni_netlist, zombie_list);
2075                         break;
2076                 }
2077
2078                 if (!list_empty(&ni->ni_netlist)) {
2079                         lnet_net_unlock(LNET_LOCK_EX);
2080                         ++i;
2081                         if ((i & (-i)) == i) {
2082                                 CDEBUG(D_WARNING,
2083                                        "Waiting for zombie LNI %s\n",
2084                                        libcfs_nid2str(ni->ni_nid));
2085                         }
2086                         schedule_timeout_uninterruptible(cfs_time_seconds(1));
2087                         lnet_net_lock(LNET_LOCK_EX);
2088                         continue;
2089                 }
2090
2091                 lnet_net_unlock(LNET_LOCK_EX);
2092
2093                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
2094
2095                 LASSERT(!in_interrupt());
2096                 /* Holding the mutex makes it safe for lnd_shutdown
2097                  * to call module_put(). Module unload cannot finish
2098                  * until lnet_unregister_lnd() completes, and that
2099                  * requires the mutex.
2100                  */
2101                 mutex_lock(&the_lnet.ln_lnd_mutex);
2102                 (net->net_lnd->lnd_shutdown)(ni);
2103                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2104
2105                 if (!islo)
2106                         CDEBUG(D_LNI, "Removed LNI %s\n",
2107                               libcfs_nid2str(ni->ni_nid));
2108
2109                 lnet_ni_free(ni);
2110                 i = 2;
2111                 lnet_net_lock(LNET_LOCK_EX);
2112         }
2113 }
2114
2115 /* shutdown down the NI and release refcount */
2116 static void
2117 lnet_shutdown_lndni(struct lnet_ni *ni)
2118 {
2119         int i;
2120         struct lnet_net *net = ni->ni_net;
2121
2122         lnet_net_lock(LNET_LOCK_EX);
2123         lnet_ni_lock(ni);
2124         ni->ni_state = LNET_NI_STATE_DELETING;
2125         lnet_ni_unlock(ni);
2126         lnet_ni_unlink_locked(ni);
2127         lnet_incr_dlc_seq();
2128         lnet_net_unlock(LNET_LOCK_EX);
2129
2130         /* clear messages for this NI on the lazy portal */
2131         for (i = 0; i < the_lnet.ln_nportals; i++)
2132                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
2133
2134         lnet_net_lock(LNET_LOCK_EX);
2135         lnet_clear_zombies_nis_locked(net);
2136         lnet_net_unlock(LNET_LOCK_EX);
2137 }
2138
2139 static void
2140 lnet_shutdown_lndnet(struct lnet_net *net)
2141 {
2142         struct lnet_ni *ni;
2143
2144         lnet_net_lock(LNET_LOCK_EX);
2145
2146         list_del_init(&net->net_list);
2147
2148         while (!list_empty(&net->net_ni_list)) {
2149                 ni = list_entry(net->net_ni_list.next,
2150                                 struct lnet_ni, ni_netlist);
2151                 lnet_net_unlock(LNET_LOCK_EX);
2152                 lnet_shutdown_lndni(ni);
2153                 lnet_net_lock(LNET_LOCK_EX);
2154         }
2155
2156         lnet_net_unlock(LNET_LOCK_EX);
2157
2158         /* Do peer table cleanup for this net */
2159         lnet_peer_tables_cleanup(net);
2160
2161         lnet_net_free(net);
2162 }
2163
2164 static void
2165 lnet_shutdown_lndnets(void)
2166 {
2167         struct lnet_net *net;
2168         LIST_HEAD(resend);
2169         struct lnet_msg *msg, *tmp;
2170
2171         /* NB called holding the global mutex */
2172
2173         /* All quiet on the API front */
2174         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
2175         LASSERT(the_lnet.ln_refcount == 0);
2176
2177         lnet_net_lock(LNET_LOCK_EX);
2178         the_lnet.ln_state = LNET_STATE_STOPPING;
2179
2180         /*
2181          * move the nets to the zombie list to avoid them being
2182          * picked up for new work. LONET is also included in the
2183          * Nets that will be moved to the zombie list
2184          */
2185         list_splice_init(&the_lnet.ln_nets, &the_lnet.ln_net_zombie);
2186
2187         /* Drop the cached loopback Net. */
2188         if (the_lnet.ln_loni != NULL) {
2189                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
2190                 the_lnet.ln_loni = NULL;
2191         }
2192         lnet_net_unlock(LNET_LOCK_EX);
2193
2194         /* iterate through the net zombie list and delete each net */
2195         while (!list_empty(&the_lnet.ln_net_zombie)) {
2196                 net = list_entry(the_lnet.ln_net_zombie.next,
2197                                  struct lnet_net, net_list);
2198                 lnet_shutdown_lndnet(net);
2199         }
2200
2201         spin_lock(&the_lnet.ln_msg_resend_lock);
2202         list_splice(&the_lnet.ln_msg_resend, &resend);
2203         spin_unlock(&the_lnet.ln_msg_resend_lock);
2204
2205         list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
2206                 list_del_init(&msg->msg_list);
2207                 msg->msg_no_resend = true;
2208                 lnet_finalize(msg, -ECANCELED);
2209         }
2210
2211         lnet_net_lock(LNET_LOCK_EX);
2212         the_lnet.ln_state = LNET_STATE_SHUTDOWN;
2213         lnet_net_unlock(LNET_LOCK_EX);
2214 }
2215
2216 static int
2217 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
2218 {
2219         int                     rc = -EINVAL;
2220         struct lnet_tx_queue    *tq;
2221         int                     i;
2222         struct lnet_net         *net = ni->ni_net;
2223
2224         mutex_lock(&the_lnet.ln_lnd_mutex);
2225
2226         if (tun) {
2227                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
2228                 ni->ni_lnd_tunables_set = true;
2229         }
2230
2231         rc = (net->net_lnd->lnd_startup)(ni);
2232
2233         mutex_unlock(&the_lnet.ln_lnd_mutex);
2234
2235         if (rc != 0) {
2236                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
2237                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
2238                 goto failed0;
2239         }
2240
2241         lnet_ni_lock(ni);
2242         ni->ni_state = LNET_NI_STATE_ACTIVE;
2243         lnet_ni_unlock(ni);
2244
2245         /* We keep a reference on the loopback net through the loopback NI */
2246         if (net->net_lnd->lnd_type == LOLND) {
2247                 lnet_ni_addref(ni);
2248                 LASSERT(the_lnet.ln_loni == NULL);
2249                 the_lnet.ln_loni = ni;
2250                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
2251                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
2252                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
2253                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
2254                 return 0;
2255         }
2256
2257         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
2258             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
2259                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
2260                                    libcfs_lnd2str(net->net_lnd->lnd_type),
2261                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
2262                                         "" : "per-peer ");
2263                 /* shutdown the NI since if we get here then it must've already
2264                  * been started
2265                  */
2266                 lnet_shutdown_lndni(ni);
2267                 return -EINVAL;
2268         }
2269
2270         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
2271                 tq->tq_credits_min =
2272                 tq->tq_credits_max =
2273                 tq->tq_credits = lnet_ni_tq_credits(ni);
2274         }
2275
2276         atomic_set(&ni->ni_tx_credits,
2277                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
2278         atomic_set(&ni->ni_healthv, LNET_MAX_HEALTH_VALUE);
2279
2280         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
2281                 libcfs_nid2str(ni->ni_nid),
2282                 ni->ni_net->net_tunables.lct_peer_tx_credits,
2283                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
2284                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
2285                 ni->ni_net->net_tunables.lct_peer_timeout);
2286
2287         return 0;
2288 failed0:
2289         lnet_ni_free(ni);
2290         return rc;
2291 }
2292
2293 static int
2294 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
2295 {
2296         struct lnet_ni *ni;
2297         struct lnet_net *net_l = NULL;
2298         LIST_HEAD(local_ni_list);
2299         int rc;
2300         int ni_count = 0;
2301         __u32 lnd_type;
2302         const struct lnet_lnd  *lnd;
2303         int peer_timeout =
2304                 net->net_tunables.lct_peer_timeout;
2305         int maxtxcredits =
2306                 net->net_tunables.lct_max_tx_credits;
2307         int peerrtrcredits =
2308                 net->net_tunables.lct_peer_rtr_credits;
2309
2310         /*
2311          * make sure that this net is unique. If it isn't then
2312          * we are adding interfaces to an already existing network, and
2313          * 'net' is just a convenient way to pass in the list.
2314          * if it is unique we need to find the LND and load it if
2315          * necessary.
2316          */
2317         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
2318                 lnd_type = LNET_NETTYP(net->net_id);
2319
2320                 mutex_lock(&the_lnet.ln_lnd_mutex);
2321                 lnd = lnet_find_lnd_by_type(lnd_type);
2322
2323                 if (lnd == NULL) {
2324                         mutex_unlock(&the_lnet.ln_lnd_mutex);
2325                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
2326                         mutex_lock(&the_lnet.ln_lnd_mutex);
2327
2328                         lnd = lnet_find_lnd_by_type(lnd_type);
2329                         if (lnd == NULL) {
2330                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2331                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
2332                                 libcfs_lnd2str(lnd_type),
2333                                 libcfs_lnd2modname(lnd_type), rc);
2334 #ifndef HAVE_MODULE_LOADING_SUPPORT
2335                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
2336                                                 "compiled with kernel module "
2337                                                 "loading support.");
2338 #endif
2339                                 rc = -EINVAL;
2340                                 goto failed0;
2341                         }
2342                 }
2343
2344                 net->net_lnd = lnd;
2345
2346                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2347
2348                 net_l = net;
2349         }
2350
2351         /*
2352          * net_l: if the network being added is unique then net_l
2353          *        will point to that network
2354          *        if the network being added is not unique then
2355          *        net_l points to the existing network.
2356          *
2357          * When we enter the loop below, we'll pick NIs off he
2358          * network beign added and start them up, then add them to
2359          * a local ni list. Once we've successfully started all
2360          * the NIs then we join the local NI list (of started up
2361          * networks) with the net_l->net_ni_list, which should
2362          * point to the correct network to add the new ni list to
2363          *
2364          * If any of the new NIs fail to start up, then we want to
2365          * iterate through the local ni list, which should include
2366          * any NIs which were successfully started up, and shut
2367          * them down.
2368          *
2369          * After than we want to delete the network being added,
2370          * to avoid a memory leak.
2371          */
2372
2373         /*
2374          * When a network uses TCP bonding then all its interfaces
2375          * must be specified when the network is first defined: the
2376          * TCP bonding code doesn't allow for interfaces to be added
2377          * or removed.
2378          */
2379         if (net_l != net && net_l != NULL && use_tcp_bonding &&
2380             LNET_NETTYP(net_l->net_id) == SOCKLND) {
2381                 rc = -EINVAL;
2382                 goto failed0;
2383         }
2384
2385         while (!list_empty(&net->net_ni_added)) {
2386                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
2387                                 ni_netlist);
2388                 list_del_init(&ni->ni_netlist);
2389
2390                 /* make sure that the the NI we're about to start
2391                  * up is actually unique. if it's not fail. */
2392                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
2393                                         ni->ni_interfaces[0])) {
2394                         rc = -EEXIST;
2395                         goto failed1;
2396                 }
2397
2398                 /* adjust the pointer the parent network, just in case it
2399                  * the net is a duplicate */
2400                 ni->ni_net = net_l;
2401
2402                 rc = lnet_startup_lndni(ni, tun);
2403
2404                 if (rc < 0)
2405                         goto failed1;
2406
2407                 lnet_ni_addref(ni);
2408                 list_add_tail(&ni->ni_netlist, &local_ni_list);
2409
2410                 ni_count++;
2411         }
2412
2413         lnet_net_lock(LNET_LOCK_EX);
2414         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
2415         lnet_incr_dlc_seq();
2416         lnet_net_unlock(LNET_LOCK_EX);
2417
2418         /* if the network is not unique then we don't want to keep
2419          * it around after we're done. Free it. Otherwise add that
2420          * net to the global the_lnet.ln_nets */
2421         if (net_l != net && net_l != NULL) {
2422                 /*
2423                  * TODO - note. currently the tunables can not be updated
2424                  * once added
2425                  */
2426                 lnet_net_free(net);
2427         } else {
2428                 /*
2429                  * restore tunables after it has been overwitten by the
2430                  * lnd
2431                  */
2432                 if (peer_timeout != -1)
2433                         net->net_tunables.lct_peer_timeout = peer_timeout;
2434                 if (maxtxcredits != -1)
2435                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
2436                 if (peerrtrcredits != -1)
2437                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
2438
2439                 lnet_net_lock(LNET_LOCK_EX);
2440                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
2441                 lnet_net_unlock(LNET_LOCK_EX);
2442         }
2443
2444         /* update net count */
2445         lnet_current_net_count = lnet_get_net_count();
2446
2447         return ni_count;
2448
2449 failed1:
2450         /*
2451          * shutdown the new NIs that are being started up
2452          * free the NET being started
2453          */
2454         while (!list_empty(&local_ni_list)) {
2455                 ni = list_entry(local_ni_list.next, struct lnet_ni,
2456                                 ni_netlist);
2457
2458                 lnet_shutdown_lndni(ni);
2459         }
2460
2461 failed0:
2462         lnet_net_free(net);
2463
2464         return rc;
2465 }
2466
2467 static int
2468 lnet_startup_lndnets(struct list_head *netlist)
2469 {
2470         struct lnet_net         *net;
2471         int                     rc;
2472         int                     ni_count = 0;
2473
2474         /*
2475          * Change to running state before bringing up the LNDs. This
2476          * allows lnet_shutdown_lndnets() to assert that we've passed
2477          * through here.
2478          */
2479         lnet_net_lock(LNET_LOCK_EX);
2480         the_lnet.ln_state = LNET_STATE_RUNNING;
2481         lnet_net_unlock(LNET_LOCK_EX);
2482
2483         while (!list_empty(netlist)) {
2484                 net = list_entry(netlist->next, struct lnet_net, net_list);
2485                 list_del_init(&net->net_list);
2486
2487                 rc = lnet_startup_lndnet(net, NULL);
2488
2489                 if (rc < 0)
2490                         goto failed;
2491
2492                 ni_count += rc;
2493         }
2494
2495         return ni_count;
2496 failed:
2497         lnet_shutdown_lndnets();
2498
2499         return rc;
2500 }
2501
2502 /**
2503  * Initialize LNet library.
2504  *
2505  * Automatically called at module loading time. Caller has to call
2506  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
2507  * latter returned 0. It must be called exactly once.
2508  *
2509  * \retval 0 on success
2510  * \retval -ve on failures.
2511  */
2512 int lnet_lib_init(void)
2513 {
2514         int rc;
2515
2516         lnet_assert_wire_constants();
2517
2518         /* refer to global cfs_cpt_table for now */
2519         the_lnet.ln_cpt_table = cfs_cpt_tab;
2520         the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_tab);
2521
2522         LASSERT(the_lnet.ln_cpt_number > 0);
2523         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
2524                 /* we are under risk of consuming all lh_cookie */
2525                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
2526                        "please change setting of CPT-table and retry\n",
2527                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
2528                 return -E2BIG;
2529         }
2530
2531         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
2532                 the_lnet.ln_cpt_bits++;
2533
2534         rc = lnet_create_locks();
2535         if (rc != 0) {
2536                 CERROR("Can't create LNet global locks: %d\n", rc);
2537                 return rc;
2538         }
2539
2540         the_lnet.ln_refcount = 0;
2541         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
2542         INIT_LIST_HEAD(&the_lnet.ln_msg_resend);
2543
2544         /* The hash table size is the number of bits it takes to express the set
2545          * ln_num_routes, minus 1 (better to under estimate than over so we
2546          * don't waste memory). */
2547         if (rnet_htable_size <= 0)
2548                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
2549         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
2550                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
2551         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
2552                                            order_base_2(rnet_htable_size) - 1);
2553
2554         /* All LNDs apart from the LOLND are in separate modules.  They
2555          * register themselves when their module loads, and unregister
2556          * themselves when their module is unloaded. */
2557         lnet_register_lnd(&the_lolnd);
2558         return 0;
2559 }
2560
2561 /**
2562  * Finalize LNet library.
2563  *
2564  * \pre lnet_lib_init() called with success.
2565  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
2566  *
2567  * As this happens at module-unload, all lnds must already be unloaded,
2568  * so they must already be unregistered.
2569  */
2570 void lnet_lib_exit(void)
2571 {
2572         int i;
2573
2574         LASSERT(the_lnet.ln_refcount == 0);
2575         lnet_unregister_lnd(&the_lolnd);
2576         for (i = 0; i < NUM_LNDS; i++)
2577                 LASSERT(!the_lnet.ln_lnds[i]);
2578         lnet_destroy_locks();
2579 }
2580
2581 /**
2582  * Set LNet PID and start LNet interfaces, routing, and forwarding.
2583  *
2584  * Users must call this function at least once before any other functions.
2585  * For each successful call there must be a corresponding call to
2586  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
2587  * ignored.
2588  *
2589  * The PID used by LNet may be different from the one requested.
2590  * See LNetGetId().
2591  *
2592  * \param requested_pid PID requested by the caller.
2593  *
2594  * \return >= 0 on success, and < 0 error code on failures.
2595  */
2596 int
2597 LNetNIInit(lnet_pid_t requested_pid)
2598 {
2599         int                     im_a_router = 0;
2600         int                     rc;
2601         int                     ni_count;
2602         struct lnet_ping_buffer *pbuf;
2603         struct lnet_handle_md   ping_mdh;
2604         LIST_HEAD(net_head);
2605         struct lnet_net         *net;
2606
2607         mutex_lock(&the_lnet.ln_api_mutex);
2608
2609         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
2610
2611         if (the_lnet.ln_refcount > 0) {
2612                 rc = the_lnet.ln_refcount++;
2613                 mutex_unlock(&the_lnet.ln_api_mutex);
2614                 return rc;
2615         }
2616
2617         rc = lnet_prepare(requested_pid);
2618         if (rc != 0) {
2619                 mutex_unlock(&the_lnet.ln_api_mutex);
2620                 return rc;
2621         }
2622
2623         /* create a network for Loopback network */
2624         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
2625         if (net == NULL) {
2626                 rc = -ENOMEM;
2627                 goto err_empty_list;
2628         }
2629
2630         /* Add in the loopback NI */
2631         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
2632                 rc = -ENOMEM;
2633                 goto err_empty_list;
2634         }
2635
2636         /* If LNet is being initialized via DLC it is possible
2637          * that the user requests not to load module parameters (ones which
2638          * are supported by DLC) on initialization.  Therefore, make sure not
2639          * to load networks, routes and forwarding from module parameters
2640          * in this case.  On cleanup in case of failure only clean up
2641          * routes if it has been loaded */
2642         if (!the_lnet.ln_nis_from_mod_params) {
2643                 rc = lnet_parse_networks(&net_head, lnet_get_networks(),
2644                                          use_tcp_bonding);
2645                 if (rc < 0)
2646                         goto err_empty_list;
2647         }
2648
2649         ni_count = lnet_startup_lndnets(&net_head);
2650         if (ni_count < 0) {
2651                 rc = ni_count;
2652                 goto err_empty_list;
2653         }
2654
2655         if (!the_lnet.ln_nis_from_mod_params) {
2656                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
2657                 if (rc != 0)
2658                         goto err_shutdown_lndnis;
2659
2660                 rc = lnet_rtrpools_alloc(im_a_router);
2661                 if (rc != 0)
2662                         goto err_destroy_routes;
2663         }
2664
2665         rc = lnet_acceptor_start();
2666         if (rc != 0)
2667                 goto err_destroy_routes;
2668
2669         the_lnet.ln_refcount = 1;
2670         /* Now I may use my own API functions... */
2671
2672         rc = lnet_ping_target_setup(&pbuf, &ping_mdh, ni_count, true);
2673         if (rc != 0)
2674                 goto err_acceptor_stop;
2675
2676         lnet_ping_target_update(pbuf, ping_mdh);
2677
2678         the_lnet.ln_mt_handler = lnet_mt_event_handler;
2679
2680         rc = lnet_push_target_init();
2681         if (rc != 0)
2682                 goto err_stop_ping;
2683
2684         rc = lnet_peer_discovery_start();
2685         if (rc != 0)
2686                 goto err_destroy_push_target;
2687
2688         rc = lnet_monitor_thr_start();
2689         if (rc != 0)
2690                 goto err_stop_discovery_thr;
2691
2692         lnet_fault_init();
2693         lnet_router_debugfs_init();
2694
2695         mutex_unlock(&the_lnet.ln_api_mutex);
2696
2697         complete_all(&the_lnet.ln_started);
2698
2699         /* wait for all routers to start */
2700         lnet_wait_router_start();
2701
2702         return 0;
2703
2704 err_stop_discovery_thr:
2705         lnet_peer_discovery_stop();
2706 err_destroy_push_target:
2707         lnet_push_target_fini();
2708 err_stop_ping:
2709         lnet_ping_target_fini();
2710 err_acceptor_stop:
2711         the_lnet.ln_refcount = 0;
2712         lnet_acceptor_stop();
2713 err_destroy_routes:
2714         if (!the_lnet.ln_nis_from_mod_params)
2715                 lnet_destroy_routes();
2716 err_shutdown_lndnis:
2717         lnet_shutdown_lndnets();
2718 err_empty_list:
2719         lnet_unprepare();
2720         LASSERT(rc < 0);
2721         mutex_unlock(&the_lnet.ln_api_mutex);
2722         while (!list_empty(&net_head)) {
2723                 struct lnet_net *net;
2724
2725                 net = list_entry(net_head.next, struct lnet_net, net_list);
2726                 list_del_init(&net->net_list);
2727                 lnet_net_free(net);
2728         }
2729         return rc;
2730 }
2731 EXPORT_SYMBOL(LNetNIInit);
2732
2733 /**
2734  * Stop LNet interfaces, routing, and forwarding.
2735  *
2736  * Users must call this function once for each successful call to LNetNIInit().
2737  * Once the LNetNIFini() operation has been started, the results of pending
2738  * API operations are undefined.
2739  *
2740  * \return always 0 for current implementation.
2741  */
2742 int
2743 LNetNIFini(void)
2744 {
2745         mutex_lock(&the_lnet.ln_api_mutex);
2746
2747         LASSERT(the_lnet.ln_refcount > 0);
2748
2749         if (the_lnet.ln_refcount != 1) {
2750                 the_lnet.ln_refcount--;
2751         } else {
2752                 LASSERT(!the_lnet.ln_niinit_self);
2753
2754                 lnet_fault_fini();
2755
2756                 lnet_router_debugfs_fini();
2757                 lnet_monitor_thr_stop();
2758                 lnet_peer_discovery_stop();
2759                 lnet_push_target_fini();
2760                 lnet_ping_target_fini();
2761
2762                 /* Teardown fns that use my own API functions BEFORE here */
2763                 the_lnet.ln_refcount = 0;
2764
2765                 lnet_acceptor_stop();
2766                 lnet_destroy_routes();
2767                 lnet_shutdown_lndnets();
2768                 lnet_unprepare();
2769         }
2770
2771         mutex_unlock(&the_lnet.ln_api_mutex);
2772         return 0;
2773 }
2774 EXPORT_SYMBOL(LNetNIFini);
2775
2776 /**
2777  * Grabs the ni data from the ni structure and fills the out
2778  * parameters
2779  *
2780  * \param[in] ni network        interface structure
2781  * \param[out] cfg_ni           NI config information
2782  * \param[out] tun              network and LND tunables
2783  */
2784 static void
2785 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
2786                    struct lnet_ioctl_config_lnd_tunables *tun,
2787                    struct lnet_ioctl_element_stats *stats,
2788                    __u32 tun_size)
2789 {
2790         size_t min_size = 0;
2791         int i;
2792
2793         if (!ni || !cfg_ni || !tun)
2794                 return;
2795
2796         if (ni->ni_interfaces[0] != NULL) {
2797                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2798                         if (ni->ni_interfaces[i] != NULL) {
2799                                 strncpy(cfg_ni->lic_ni_intf[i],
2800                                         ni->ni_interfaces[i],
2801                                         sizeof(cfg_ni->lic_ni_intf[i]));
2802                         }
2803                 }
2804         }
2805
2806         cfg_ni->lic_nid = ni->ni_nid;
2807         if (ni->ni_nid == LNET_NID_LO_0)
2808                 cfg_ni->lic_status = LNET_NI_STATUS_UP;
2809         else
2810                 cfg_ni->lic_status = ni->ni_status->ns_status;
2811         cfg_ni->lic_tcp_bonding = use_tcp_bonding;
2812         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
2813
2814         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
2815
2816         if (stats) {
2817                 stats->iel_send_count = lnet_sum_stats(&ni->ni_stats,
2818                                                        LNET_STATS_TYPE_SEND);
2819                 stats->iel_recv_count = lnet_sum_stats(&ni->ni_stats,
2820                                                        LNET_STATS_TYPE_RECV);
2821                 stats->iel_drop_count = lnet_sum_stats(&ni->ni_stats,
2822                                                        LNET_STATS_TYPE_DROP);
2823         }
2824
2825         /*
2826          * tun->lt_tun will always be present, but in order to be
2827          * backwards compatible, we need to deal with the cases when
2828          * tun->lt_tun is smaller than what the kernel has, because it
2829          * comes from an older version of a userspace program, then we'll
2830          * need to copy as much information as we have available space.
2831          */
2832         min_size = tun_size - sizeof(tun->lt_cmn);
2833         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
2834
2835         /* copy over the cpts */
2836         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
2837             ni->ni_cpts == NULL)  {
2838                 for (i = 0; i < ni->ni_ncpts; i++)
2839                         cfg_ni->lic_cpts[i] = i;
2840         } else {
2841                 for (i = 0;
2842                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
2843                      i < LNET_MAX_SHOW_NUM_CPT;
2844                      i++)
2845                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
2846         }
2847         cfg_ni->lic_ncpts = ni->ni_ncpts;
2848 }
2849
2850 /**
2851  * NOTE: This is a legacy function left in the code to be backwards
2852  * compatible with older userspace programs. It should eventually be
2853  * removed.
2854  *
2855  * Grabs the ni data from the ni structure and fills the out
2856  * parameters
2857  *
2858  * \param[in] ni network        interface structure
2859  * \param[out] config           config information
2860  */
2861 static void
2862 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
2863                          struct lnet_ioctl_config_data *config)
2864 {
2865         struct lnet_ioctl_net_config *net_config;
2866         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
2867         size_t min_size, tunable_size = 0;
2868         int i;
2869
2870         if (!ni || !config)
2871                 return;
2872
2873         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
2874         if (!net_config)
2875                 return;
2876
2877         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
2878                      ARRAY_SIZE(net_config->ni_interfaces));
2879
2880         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2881                 if (!ni->ni_interfaces[i])
2882                         break;
2883
2884                 strncpy(net_config->ni_interfaces[i],
2885                         ni->ni_interfaces[i],
2886                         sizeof(net_config->ni_interfaces[i]));
2887         }
2888
2889         config->cfg_nid = ni->ni_nid;
2890         config->cfg_config_u.cfg_net.net_peer_timeout =
2891                 ni->ni_net->net_tunables.lct_peer_timeout;
2892         config->cfg_config_u.cfg_net.net_max_tx_credits =
2893                 ni->ni_net->net_tunables.lct_max_tx_credits;
2894         config->cfg_config_u.cfg_net.net_peer_tx_credits =
2895                 ni->ni_net->net_tunables.lct_peer_tx_credits;
2896         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
2897                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
2898
2899         if (ni->ni_nid == LNET_NID_LO_0)
2900                 net_config->ni_status = LNET_NI_STATUS_UP;
2901         else
2902                 net_config->ni_status = ni->ni_status->ns_status;
2903
2904         if (ni->ni_cpts) {
2905                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
2906
2907                 for (i = 0; i < num_cpts; i++)
2908                         net_config->ni_cpts[i] = ni->ni_cpts[i];
2909
2910                 config->cfg_ncpts = num_cpts;
2911         }
2912
2913         /*
2914          * See if user land tools sent in a newer and larger version
2915          * of struct lnet_tunables than what the kernel uses.
2916          */
2917         min_size = sizeof(*config) + sizeof(*net_config);
2918
2919         if (config->cfg_hdr.ioc_len > min_size)
2920                 tunable_size = config->cfg_hdr.ioc_len - min_size;
2921
2922         /* Don't copy too much data to user space */
2923         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
2924         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
2925
2926         if (lnd_cfg && min_size) {
2927                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
2928                 config->cfg_config_u.cfg_net.net_interface_count = 1;
2929
2930                 /* Tell user land that kernel side has less data */
2931                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
2932                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
2933                         config->cfg_hdr.ioc_len -= min_size;
2934                 }
2935         }
2936 }
2937
2938 struct lnet_ni *
2939 lnet_get_ni_idx_locked(int idx)
2940 {
2941         struct lnet_ni          *ni;
2942         struct lnet_net         *net;
2943
2944         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2945                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2946                         if (idx-- == 0)
2947                                 return ni;
2948                 }
2949         }
2950
2951         return NULL;
2952 }
2953
2954 struct lnet_ni *
2955 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
2956 {
2957         struct lnet_ni          *ni;
2958         struct lnet_net         *net = mynet;
2959
2960         /*
2961          * It is possible that the net has been cleaned out while there is
2962          * a message being sent. This function accessed the net without
2963          * checking if the list is empty
2964          */
2965         if (prev == NULL) {
2966                 if (net == NULL)
2967                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
2968                                         net_list);
2969                 if (list_empty(&net->net_ni_list))
2970                         return NULL;
2971                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2972                                 ni_netlist);
2973
2974                 return ni;
2975         }
2976
2977         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
2978                 /* if you reached the end of the ni list and the net is
2979                  * specified, then there are no more nis in that net */
2980                 if (net != NULL)
2981                         return NULL;
2982
2983                 /* we reached the end of this net ni list. move to the
2984                  * next net */
2985                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
2986                         /* no more nets and no more NIs. */
2987                         return NULL;
2988
2989                 /* get the next net */
2990                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
2991                                  net_list);
2992                 if (list_empty(&net->net_ni_list))
2993                         return NULL;
2994                 /* get the ni on it */
2995                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2996                                 ni_netlist);
2997
2998                 return ni;
2999         }
3000
3001         if (list_empty(&prev->ni_netlist))
3002                 return NULL;
3003
3004         /* there are more nis left */
3005         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
3006
3007         return ni;
3008 }
3009
3010 int
3011 lnet_get_net_config(struct lnet_ioctl_config_data *config)
3012 {
3013         struct lnet_ni *ni;
3014         int cpt;
3015         int rc = -ENOENT;
3016         int idx = config->cfg_count;
3017
3018         cpt = lnet_net_lock_current();
3019
3020         ni = lnet_get_ni_idx_locked(idx);
3021
3022         if (ni != NULL) {
3023                 rc = 0;
3024                 lnet_ni_lock(ni);
3025                 lnet_fill_ni_info_legacy(ni, config);
3026                 lnet_ni_unlock(ni);
3027         }
3028
3029         lnet_net_unlock(cpt);
3030         return rc;
3031 }
3032
3033 int
3034 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
3035                    struct lnet_ioctl_config_lnd_tunables *tun,
3036                    struct lnet_ioctl_element_stats *stats,
3037                    __u32 tun_size)
3038 {
3039         struct lnet_ni          *ni;
3040         int                     cpt;
3041         int                     rc = -ENOENT;
3042
3043         if (!cfg_ni || !tun || !stats)
3044                 return -EINVAL;
3045
3046         cpt = lnet_net_lock_current();
3047
3048         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
3049
3050         if (ni) {
3051                 rc = 0;
3052                 lnet_ni_lock(ni);
3053                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
3054                 lnet_ni_unlock(ni);
3055         }
3056
3057         lnet_net_unlock(cpt);
3058         return rc;
3059 }
3060
3061 int lnet_get_ni_stats(struct lnet_ioctl_element_msg_stats *msg_stats)
3062 {
3063         struct lnet_ni *ni;
3064         int cpt;
3065         int rc = -ENOENT;
3066
3067         if (!msg_stats)
3068                 return -EINVAL;
3069
3070         cpt = lnet_net_lock_current();
3071
3072         ni = lnet_get_ni_idx_locked(msg_stats->im_idx);
3073
3074         if (ni) {
3075                 lnet_usr_translate_stats(msg_stats, &ni->ni_stats);
3076                 rc = 0;
3077         }
3078
3079         lnet_net_unlock(cpt);
3080
3081         return rc;
3082 }
3083
3084 static int lnet_add_net_common(struct lnet_net *net,
3085                                struct lnet_ioctl_config_lnd_tunables *tun)
3086 {
3087         __u32                   net_id;
3088         struct lnet_ping_buffer *pbuf;
3089         struct lnet_handle_md   ping_mdh;
3090         int                     rc;
3091         struct lnet_remotenet *rnet;
3092         int                     net_ni_count;
3093
3094         lnet_net_lock(LNET_LOCK_EX);
3095         rnet = lnet_find_rnet_locked(net->net_id);
3096         lnet_net_unlock(LNET_LOCK_EX);
3097         /*
3098          * make sure that the net added doesn't invalidate the current
3099          * configuration LNet is keeping
3100          */
3101         if (rnet) {
3102                 CERROR("Adding net %s will invalidate routing configuration\n",
3103                        libcfs_net2str(net->net_id));
3104                 lnet_net_free(net);
3105                 return -EUSERS;
3106         }
3107
3108         /*
3109          * make sure you calculate the correct number of slots in the ping
3110          * buffer. Since the ping info is a flattened list of all the NIs,
3111          * we should allocate enough slots to accomodate the number of NIs
3112          * which will be added.
3113          *
3114          * since ni hasn't been configured yet, use
3115          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
3116          */
3117         net_ni_count = lnet_get_net_ni_count_pre(net);
3118
3119         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3120                                     net_ni_count + lnet_get_ni_count(),
3121                                     false);
3122         if (rc < 0) {
3123                 lnet_net_free(net);
3124                 return rc;
3125         }
3126
3127         if (tun)
3128                 memcpy(&net->net_tunables,
3129                        &tun->lt_cmn, sizeof(net->net_tunables));
3130         else
3131                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
3132
3133         net_id = net->net_id;
3134
3135         rc = lnet_startup_lndnet(net,
3136                                  (tun) ? &tun->lt_tun : NULL);
3137         if (rc < 0)
3138                 goto failed;
3139
3140         lnet_net_lock(LNET_LOCK_EX);
3141         net = lnet_get_net_locked(net_id);
3142         lnet_net_unlock(LNET_LOCK_EX);
3143
3144         LASSERT(net);
3145
3146         /*
3147          * Start the acceptor thread if this is the first network
3148          * being added that requires the thread.
3149          */
3150         if (net->net_lnd->lnd_accept) {
3151                 rc = lnet_acceptor_start();
3152                 if (rc < 0) {
3153                         /* shutdown the net that we just started */
3154                         CERROR("Failed to start up acceptor thread\n");
3155                         lnet_shutdown_lndnet(net);
3156                         goto failed;
3157                 }
3158         }
3159
3160         lnet_net_lock(LNET_LOCK_EX);
3161         lnet_peer_net_added(net);
3162         lnet_net_unlock(LNET_LOCK_EX);
3163
3164         lnet_ping_target_update(pbuf, ping_mdh);
3165
3166         return 0;
3167
3168 failed:
3169         lnet_ping_md_unlink(pbuf, &ping_mdh);
3170         lnet_ping_buffer_decref(pbuf);
3171         return rc;
3172 }
3173
3174 static void
3175 lnet_set_tune_defaults(struct lnet_ioctl_config_lnd_tunables *tun)
3176 {
3177         if (tun) {
3178                 if (!tun->lt_cmn.lct_peer_timeout)
3179                         tun->lt_cmn.lct_peer_timeout = DEFAULT_PEER_TIMEOUT;
3180                 if (!tun->lt_cmn.lct_peer_tx_credits)
3181                         tun->lt_cmn.lct_peer_tx_credits = DEFAULT_PEER_CREDITS;
3182                 if (!tun->lt_cmn.lct_max_tx_credits)
3183                         tun->lt_cmn.lct_max_tx_credits = DEFAULT_CREDITS;
3184         }
3185 }
3186
3187 static int lnet_handle_legacy_ip2nets(char *ip2nets,
3188                                       struct lnet_ioctl_config_lnd_tunables *tun)
3189 {
3190         struct lnet_net *net;
3191         const char *nets;
3192         int rc;
3193         LIST_HEAD(net_head);
3194
3195         rc = lnet_parse_ip2nets(&nets, ip2nets);
3196         if (rc < 0)
3197                 return rc;
3198
3199         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3200         if (rc < 0)
3201                 return rc;
3202
3203         lnet_set_tune_defaults(tun);
3204
3205         mutex_lock(&the_lnet.ln_api_mutex);
3206         while (!list_empty(&net_head)) {
3207                 net = list_entry(net_head.next, struct lnet_net, net_list);
3208                 list_del_init(&net->net_list);
3209                 rc = lnet_add_net_common(net, tun);
3210                 if (rc < 0)
3211                         goto out;
3212         }
3213
3214 out:
3215         mutex_unlock(&the_lnet.ln_api_mutex);
3216
3217         while (!list_empty(&net_head)) {
3218                 net = list_entry(net_head.next, struct lnet_net, net_list);
3219                 list_del_init(&net->net_list);
3220                 lnet_net_free(net);
3221         }
3222         return rc;
3223 }
3224
3225 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
3226 {
3227         struct lnet_net *net;
3228         struct lnet_ni *ni;
3229         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3230         int rc, i;
3231         __u32 net_id, lnd_type;
3232
3233         /* get the tunables if they are available */
3234         if (conf->lic_cfg_hdr.ioc_len >=
3235             sizeof(*conf) + sizeof(*tun))
3236                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3237                         conf->lic_bulk;
3238
3239         /* handle legacy ip2nets from DLC */
3240         if (conf->lic_legacy_ip2nets[0] != '\0')
3241                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
3242                                                   tun);
3243
3244         net_id = LNET_NIDNET(conf->lic_nid);
3245         lnd_type = LNET_NETTYP(net_id);
3246
3247         if (!libcfs_isknown_lnd(lnd_type)) {
3248                 CERROR("No valid net and lnd information provided\n");
3249                 return -EINVAL;
3250         }
3251
3252         net = lnet_net_alloc(net_id, NULL);
3253         if (!net)
3254                 return -ENOMEM;
3255
3256         for (i = 0; i < conf->lic_ncpts; i++) {
3257                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
3258                         return -EINVAL;
3259         }
3260
3261         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
3262                                        conf->lic_ni_intf[0]);
3263         if (!ni)
3264                 return -ENOMEM;
3265
3266         lnet_set_tune_defaults(tun);
3267
3268         mutex_lock(&the_lnet.ln_api_mutex);
3269
3270         rc = lnet_add_net_common(net, tun);
3271
3272         mutex_unlock(&the_lnet.ln_api_mutex);
3273
3274         return rc;
3275 }
3276
3277 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
3278 {
3279         struct lnet_net  *net;
3280         struct lnet_ni *ni;
3281         __u32 net_id = LNET_NIDNET(conf->lic_nid);
3282         struct lnet_ping_buffer *pbuf;
3283         struct lnet_handle_md  ping_mdh;
3284         int               rc;
3285         int               net_count;
3286         __u32             addr;
3287
3288         /* don't allow userspace to shutdown the LOLND */
3289         if (LNET_NETTYP(net_id) == LOLND)
3290                 return -EINVAL;
3291
3292         mutex_lock(&the_lnet.ln_api_mutex);
3293
3294         lnet_net_lock(0);
3295
3296         net = lnet_get_net_locked(net_id);
3297         if (!net) {
3298                 CERROR("net %s not found\n",
3299                        libcfs_net2str(net_id));
3300                 rc = -ENOENT;
3301                 goto unlock_net;
3302         }
3303
3304         addr = LNET_NIDADDR(conf->lic_nid);
3305         if (addr == 0) {
3306                 /* remove the entire net */
3307                 net_count = lnet_get_net_ni_count_locked(net);
3308
3309                 lnet_net_unlock(0);
3310
3311                 /* create and link a new ping info, before removing the old one */
3312                 rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3313                                         lnet_get_ni_count() - net_count,
3314                                         false);
3315                 if (rc != 0)
3316                         goto unlock_api_mutex;
3317
3318                 lnet_shutdown_lndnet(net);
3319
3320                 lnet_acceptor_stop();
3321
3322                 lnet_ping_target_update(pbuf, ping_mdh);
3323
3324                 goto unlock_api_mutex;
3325         }
3326
3327         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
3328         if (!ni) {
3329                 CERROR("nid %s not found\n",
3330                        libcfs_nid2str(conf->lic_nid));
3331                 rc = -ENOENT;
3332                 goto unlock_net;
3333         }
3334
3335         net_count = lnet_get_net_ni_count_locked(net);
3336
3337         lnet_net_unlock(0);
3338
3339         /* create and link a new ping info, before removing the old one */
3340         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3341                                   lnet_get_ni_count() - 1, false);
3342         if (rc != 0)
3343                 goto unlock_api_mutex;
3344
3345         lnet_shutdown_lndni(ni);
3346
3347         lnet_acceptor_stop();
3348
3349         lnet_ping_target_update(pbuf, ping_mdh);
3350
3351         /* check if the net is empty and remove it if it is */
3352         if (net_count == 1)
3353                 lnet_shutdown_lndnet(net);
3354
3355         goto unlock_api_mutex;
3356
3357 unlock_net:
3358         lnet_net_unlock(0);
3359 unlock_api_mutex:
3360         mutex_unlock(&the_lnet.ln_api_mutex);
3361
3362         return rc;
3363 }
3364
3365 /*
3366  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
3367  * They are only expected to be called for unique networks.
3368  * That can be as a result of older DLC library
3369  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
3370  */
3371 int
3372 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
3373 {
3374         struct lnet_net *net;
3375         LIST_HEAD(net_head);
3376         int rc;
3377         struct lnet_ioctl_config_lnd_tunables tun;
3378         const char *nets = conf->cfg_config_u.cfg_net.net_intf;
3379
3380         /* Create a net/ni structures for the network string */
3381         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
3382         if (rc <= 0)
3383                 return rc == 0 ? -EINVAL : rc;
3384
3385         mutex_lock(&the_lnet.ln_api_mutex);
3386
3387         if (rc > 1) {
3388                 rc = -EINVAL; /* only add one network per call */
3389                 goto out_unlock_clean;
3390         }
3391
3392         net = list_entry(net_head.next, struct lnet_net, net_list);
3393         list_del_init(&net->net_list);
3394
3395         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
3396
3397         memset(&tun, 0, sizeof(tun));
3398
3399         tun.lt_cmn.lct_peer_timeout =
3400           (!conf->cfg_config_u.cfg_net.net_peer_timeout) ? DEFAULT_PEER_TIMEOUT :
3401                 conf->cfg_config_u.cfg_net.net_peer_timeout;
3402         tun.lt_cmn.lct_peer_tx_credits =
3403           (!conf->cfg_config_u.cfg_net.net_peer_tx_credits) ? DEFAULT_PEER_CREDITS :
3404                 conf->cfg_config_u.cfg_net.net_peer_tx_credits;
3405         tun.lt_cmn.lct_peer_rtr_credits =
3406           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
3407         tun.lt_cmn.lct_max_tx_credits =
3408           (!conf->cfg_config_u.cfg_net.net_max_tx_credits) ? DEFAULT_CREDITS :
3409                 conf->cfg_config_u.cfg_net.net_max_tx_credits;
3410
3411         rc = lnet_add_net_common(net, &tun);
3412
3413 out_unlock_clean:
3414         mutex_unlock(&the_lnet.ln_api_mutex);
3415         while (!list_empty(&net_head)) {
3416                 /* net_head list is empty in success case */
3417                 net = list_entry(net_head.next, struct lnet_net, net_list);
3418                 list_del_init(&net->net_list);
3419                 lnet_net_free(net);
3420         }
3421         return rc;
3422 }
3423
3424 int
3425 lnet_dyn_del_net(__u32 net_id)
3426 {
3427         struct lnet_net  *net;
3428         struct lnet_ping_buffer *pbuf;
3429         struct lnet_handle_md ping_mdh;
3430         int               rc;
3431         int               net_ni_count;
3432
3433         /* don't allow userspace to shutdown the LOLND */
3434         if (LNET_NETTYP(net_id) == LOLND)
3435                 return -EINVAL;
3436
3437         mutex_lock(&the_lnet.ln_api_mutex);
3438
3439         lnet_net_lock(0);
3440
3441         net = lnet_get_net_locked(net_id);
3442         if (net == NULL) {
3443                 lnet_net_unlock(0);
3444                 rc = -EINVAL;
3445                 goto out;
3446         }
3447
3448         net_ni_count = lnet_get_net_ni_count_locked(net);
3449
3450         lnet_net_unlock(0);
3451
3452         /* create and link a new ping info, before removing the old one */
3453         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3454                                     lnet_get_ni_count() - net_ni_count, false);
3455         if (rc != 0)
3456                 goto out;
3457
3458         lnet_shutdown_lndnet(net);
3459
3460         lnet_acceptor_stop();
3461
3462         lnet_ping_target_update(pbuf, ping_mdh);
3463
3464 out:
3465         mutex_unlock(&the_lnet.ln_api_mutex);
3466
3467         return rc;
3468 }
3469
3470 void lnet_incr_dlc_seq(void)
3471 {
3472         atomic_inc(&lnet_dlc_seq_no);
3473 }
3474
3475 __u32 lnet_get_dlc_seq_locked(void)
3476 {
3477         return atomic_read(&lnet_dlc_seq_no);
3478 }
3479
3480 static void
3481 lnet_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3482 {
3483         struct lnet_net *net;
3484         struct lnet_ni *ni;
3485
3486         lnet_net_lock(LNET_LOCK_EX);
3487         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3488                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3489                         if (ni->ni_nid == nid || all) {
3490                                 atomic_set(&ni->ni_healthv, value);
3491                                 if (list_empty(&ni->ni_recovery) &&
3492                                     value < LNET_MAX_HEALTH_VALUE) {
3493                                         CERROR("manually adding local NI %s to recovery\n",
3494                                                libcfs_nid2str(ni->ni_nid));
3495                                         list_add_tail(&ni->ni_recovery,
3496                                                       &the_lnet.ln_mt_localNIRecovq);
3497                                         lnet_ni_addref_locked(ni, 0);
3498                                 }
3499                                 if (!all) {
3500                                         lnet_net_unlock(LNET_LOCK_EX);
3501                                         return;
3502                                 }
3503                         }
3504                 }
3505         }
3506         lnet_net_unlock(LNET_LOCK_EX);
3507 }
3508
3509 static int
3510 lnet_get_local_ni_hstats(struct lnet_ioctl_local_ni_hstats *stats)
3511 {
3512         int cpt, rc = 0;
3513         struct lnet_ni *ni;
3514         lnet_nid_t nid = stats->hlni_nid;
3515
3516         cpt = lnet_net_lock_current();
3517         ni = lnet_nid2ni_locked(nid, cpt);
3518
3519         if (!ni) {
3520                 rc = -ENOENT;
3521                 goto unlock;
3522         }
3523
3524         stats->hlni_local_interrupt = atomic_read(&ni->ni_hstats.hlt_local_interrupt);
3525         stats->hlni_local_dropped = atomic_read(&ni->ni_hstats.hlt_local_dropped);
3526         stats->hlni_local_aborted = atomic_read(&ni->ni_hstats.hlt_local_aborted);
3527         stats->hlni_local_no_route = atomic_read(&ni->ni_hstats.hlt_local_no_route);
3528         stats->hlni_local_timeout = atomic_read(&ni->ni_hstats.hlt_local_timeout);
3529         stats->hlni_local_error = atomic_read(&ni->ni_hstats.hlt_local_error);
3530         stats->hlni_health_value = atomic_read(&ni->ni_healthv);
3531
3532 unlock:
3533         lnet_net_unlock(cpt);
3534
3535         return rc;
3536 }
3537
3538 static int
3539 lnet_get_local_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3540 {
3541         struct lnet_ni *ni;
3542         int i = 0;
3543
3544         lnet_net_lock(LNET_LOCK_EX);
3545         list_for_each_entry(ni, &the_lnet.ln_mt_localNIRecovq, ni_recovery) {
3546                 list->rlst_nid_array[i] = ni->ni_nid;
3547                 i++;
3548                 if (i >= LNET_MAX_SHOW_NUM_NID)
3549                         break;
3550         }
3551         lnet_net_unlock(LNET_LOCK_EX);
3552         list->rlst_num_nids = i;
3553
3554         return 0;
3555 }
3556
3557 static int
3558 lnet_get_peer_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3559 {
3560         struct lnet_peer_ni *lpni;
3561         int i = 0;
3562
3563         lnet_net_lock(LNET_LOCK_EX);
3564         list_for_each_entry(lpni, &the_lnet.ln_mt_peerNIRecovq, lpni_recovery) {
3565                 list->rlst_nid_array[i] = lpni->lpni_nid;
3566                 i++;
3567                 if (i >= LNET_MAX_SHOW_NUM_NID)
3568                         break;
3569         }
3570         lnet_net_unlock(LNET_LOCK_EX);
3571         list->rlst_num_nids = i;
3572
3573         return 0;
3574 }
3575
3576 /**
3577  * LNet ioctl handler.
3578  *
3579  */
3580 int
3581 LNetCtl(unsigned int cmd, void *arg)
3582 {
3583         struct libcfs_ioctl_data *data = arg;
3584         struct lnet_ioctl_config_data *config;
3585         struct lnet_process_id    id = {0};
3586         struct lnet_ni           *ni;
3587         int                       rc;
3588
3589         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
3590                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
3591
3592         switch (cmd) {
3593         case IOC_LIBCFS_GET_NI:
3594                 rc = LNetGetId(data->ioc_count, &id);
3595                 data->ioc_nid = id.nid;
3596                 return rc;
3597
3598         case IOC_LIBCFS_FAIL_NID:
3599                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
3600
3601         case IOC_LIBCFS_ADD_ROUTE: {
3602                 /* default router sensitivity to 1 */
3603                 unsigned int sensitivity = 1;
3604                 config = arg;
3605
3606                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3607                         return -EINVAL;
3608
3609                 if (config->cfg_config_u.cfg_route.rtr_sensitivity) {
3610                         sensitivity =
3611                           config->cfg_config_u.cfg_route.rtr_sensitivity;
3612                 }
3613
3614                 mutex_lock(&the_lnet.ln_api_mutex);
3615                 rc = lnet_add_route(config->cfg_net,
3616                                     config->cfg_config_u.cfg_route.rtr_hop,
3617                                     config->cfg_nid,
3618                                     config->cfg_config_u.cfg_route.
3619                                         rtr_priority, sensitivity);
3620                 mutex_unlock(&the_lnet.ln_api_mutex);
3621                 return rc;
3622         }
3623
3624         case IOC_LIBCFS_DEL_ROUTE:
3625                 config = arg;
3626
3627                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3628                         return -EINVAL;
3629
3630                 mutex_lock(&the_lnet.ln_api_mutex);
3631                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
3632                 mutex_unlock(&the_lnet.ln_api_mutex);
3633                 return rc;
3634
3635         case IOC_LIBCFS_GET_ROUTE:
3636                 config = arg;
3637
3638                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3639                         return -EINVAL;
3640
3641                 mutex_lock(&the_lnet.ln_api_mutex);
3642                 rc = lnet_get_route(config->cfg_count,
3643                                     &config->cfg_net,
3644                                     &config->cfg_config_u.cfg_route.rtr_hop,
3645                                     &config->cfg_nid,
3646                                     &config->cfg_config_u.cfg_route.rtr_flags,
3647                                     &config->cfg_config_u.cfg_route.
3648                                         rtr_priority,
3649                                     &config->cfg_config_u.cfg_route.
3650                                         rtr_sensitivity);
3651                 mutex_unlock(&the_lnet.ln_api_mutex);
3652                 return rc;
3653
3654         case IOC_LIBCFS_GET_LOCAL_NI: {
3655                 struct lnet_ioctl_config_ni *cfg_ni;
3656                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3657                 struct lnet_ioctl_element_stats *stats;
3658                 __u32 tun_size;
3659
3660                 cfg_ni = arg;
3661
3662                 /* get the tunables if they are available */
3663                 if (cfg_ni->lic_cfg_hdr.ioc_len <
3664                     sizeof(*cfg_ni) + sizeof(*stats) + sizeof(*tun))
3665                         return -EINVAL;
3666
3667                 stats = (struct lnet_ioctl_element_stats *)
3668                         cfg_ni->lic_bulk;
3669                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3670                                 (cfg_ni->lic_bulk + sizeof(*stats));
3671
3672                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
3673                         sizeof(*stats);
3674
3675                 mutex_lock(&the_lnet.ln_api_mutex);
3676                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
3677                 mutex_unlock(&the_lnet.ln_api_mutex);
3678                 return rc;
3679         }
3680
3681         case IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS: {
3682                 struct lnet_ioctl_element_msg_stats *msg_stats = arg;
3683
3684                 if (msg_stats->im_hdr.ioc_len != sizeof(*msg_stats))
3685                         return -EINVAL;
3686
3687                 mutex_lock(&the_lnet.ln_api_mutex);
3688                 rc = lnet_get_ni_stats(msg_stats);
3689                 mutex_unlock(&the_lnet.ln_api_mutex);
3690
3691                 return rc;
3692         }
3693
3694         case IOC_LIBCFS_GET_NET: {
3695                 size_t total = sizeof(*config) +
3696                                sizeof(struct lnet_ioctl_net_config);
3697                 config = arg;
3698
3699                 if (config->cfg_hdr.ioc_len < total)
3700                         return -EINVAL;
3701
3702                 mutex_lock(&the_lnet.ln_api_mutex);
3703                 rc = lnet_get_net_config(config);
3704                 mutex_unlock(&the_lnet.ln_api_mutex);
3705                 return rc;
3706         }
3707
3708         case IOC_LIBCFS_GET_LNET_STATS:
3709         {
3710                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
3711
3712                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
3713                         return -EINVAL;
3714
3715                 mutex_lock(&the_lnet.ln_api_mutex);
3716                 lnet_counters_get(&lnet_stats->st_cntrs);
3717                 mutex_unlock(&the_lnet.ln_api_mutex);
3718                 return 0;
3719         }
3720
3721         case IOC_LIBCFS_CONFIG_RTR:
3722                 config = arg;
3723
3724                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3725                         return -EINVAL;
3726
3727                 mutex_lock(&the_lnet.ln_api_mutex);
3728                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
3729                         rc = lnet_rtrpools_enable();
3730                         mutex_unlock(&the_lnet.ln_api_mutex);
3731                         return rc;
3732                 }
3733                 lnet_rtrpools_disable();
3734                 mutex_unlock(&the_lnet.ln_api_mutex);
3735                 return 0;
3736
3737         case IOC_LIBCFS_ADD_BUF:
3738                 config = arg;
3739
3740                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3741                         return -EINVAL;
3742
3743                 mutex_lock(&the_lnet.ln_api_mutex);
3744                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
3745                                                 buf_tiny,
3746                                           config->cfg_config_u.cfg_buffers.
3747                                                 buf_small,
3748                                           config->cfg_config_u.cfg_buffers.
3749                                                 buf_large);
3750                 mutex_unlock(&the_lnet.ln_api_mutex);
3751                 return rc;
3752
3753         case IOC_LIBCFS_SET_NUMA_RANGE: {
3754                 struct lnet_ioctl_set_value *numa;
3755                 numa = arg;
3756                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3757                         return -EINVAL;
3758                 lnet_net_lock(LNET_LOCK_EX);
3759                 lnet_numa_range = numa->sv_value;
3760                 lnet_net_unlock(LNET_LOCK_EX);
3761                 return 0;
3762         }
3763
3764         case IOC_LIBCFS_GET_NUMA_RANGE: {
3765                 struct lnet_ioctl_set_value *numa;
3766                 numa = arg;
3767                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
3768                         return -EINVAL;
3769                 numa->sv_value = lnet_numa_range;
3770                 return 0;
3771         }
3772
3773         case IOC_LIBCFS_GET_BUF: {
3774                 struct lnet_ioctl_pool_cfg *pool_cfg;
3775                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
3776
3777                 config = arg;
3778
3779                 if (config->cfg_hdr.ioc_len < total)
3780                         return -EINVAL;
3781
3782                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
3783
3784                 mutex_lock(&the_lnet.ln_api_mutex);
3785                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
3786                 mutex_unlock(&the_lnet.ln_api_mutex);
3787                 return rc;
3788         }
3789
3790         case IOC_LIBCFS_GET_LOCAL_HSTATS: {
3791                 struct lnet_ioctl_local_ni_hstats *stats = arg;
3792
3793                 if (stats->hlni_hdr.ioc_len < sizeof(*stats))
3794                         return -EINVAL;
3795
3796                 mutex_lock(&the_lnet.ln_api_mutex);
3797                 rc = lnet_get_local_ni_hstats(stats);
3798                 mutex_unlock(&the_lnet.ln_api_mutex);
3799
3800                 return rc;
3801         }
3802
3803         case IOC_LIBCFS_GET_RECOVERY_QUEUE: {
3804                 struct lnet_ioctl_recovery_list *list = arg;
3805                 if (list->rlst_hdr.ioc_len < sizeof(*list))
3806                         return -EINVAL;
3807
3808                 mutex_lock(&the_lnet.ln_api_mutex);
3809                 if (list->rlst_type == LNET_HEALTH_TYPE_LOCAL_NI)
3810                         rc = lnet_get_local_ni_recovery_list(list);
3811                 else
3812                         rc = lnet_get_peer_ni_recovery_list(list);
3813                 mutex_unlock(&the_lnet.ln_api_mutex);
3814                 return rc;
3815         }
3816
3817         case IOC_LIBCFS_ADD_PEER_NI: {
3818                 struct lnet_ioctl_peer_cfg *cfg = arg;
3819
3820                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3821                         return -EINVAL;
3822
3823                 mutex_lock(&the_lnet.ln_api_mutex);
3824                 rc = lnet_add_peer_ni(cfg->prcfg_prim_nid,
3825                                       cfg->prcfg_cfg_nid,
3826                                       cfg->prcfg_mr);
3827                 mutex_unlock(&the_lnet.ln_api_mutex);
3828                 return rc;
3829         }
3830
3831         case IOC_LIBCFS_DEL_PEER_NI: {
3832                 struct lnet_ioctl_peer_cfg *cfg = arg;
3833
3834                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3835                         return -EINVAL;
3836
3837                 mutex_lock(&the_lnet.ln_api_mutex);
3838                 rc = lnet_del_peer_ni(cfg->prcfg_prim_nid,
3839                                       cfg->prcfg_cfg_nid);
3840                 mutex_unlock(&the_lnet.ln_api_mutex);
3841                 return rc;
3842         }
3843
3844         case IOC_LIBCFS_GET_PEER_INFO: {
3845                 struct lnet_ioctl_peer *peer_info = arg;
3846
3847                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
3848                         return -EINVAL;
3849
3850                 mutex_lock(&the_lnet.ln_api_mutex);
3851                 rc = lnet_get_peer_ni_info(
3852                    peer_info->pr_count,
3853                    &peer_info->pr_nid,
3854                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
3855                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
3856                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
3857                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
3858                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
3859                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
3860                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
3861                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
3862                 mutex_unlock(&the_lnet.ln_api_mutex);
3863                 return rc;
3864         }
3865
3866         case IOC_LIBCFS_GET_PEER_NI: {
3867                 struct lnet_ioctl_peer_cfg *cfg = arg;
3868
3869                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3870                         return -EINVAL;
3871
3872                 mutex_lock(&the_lnet.ln_api_mutex);
3873                 rc = lnet_get_peer_info(cfg,
3874                                         (void __user *)cfg->prcfg_bulk);
3875                 mutex_unlock(&the_lnet.ln_api_mutex);
3876                 return rc;
3877         }
3878
3879         case IOC_LIBCFS_GET_PEER_LIST: {
3880                 struct lnet_ioctl_peer_cfg *cfg = arg;
3881
3882                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
3883                         return -EINVAL;
3884
3885                 mutex_lock(&the_lnet.ln_api_mutex);
3886                 rc = lnet_get_peer_list(&cfg->prcfg_count, &cfg->prcfg_size,
3887                                 (struct lnet_process_id __user *)cfg->prcfg_bulk);
3888                 mutex_unlock(&the_lnet.ln_api_mutex);
3889                 return rc;
3890         }
3891
3892         case IOC_LIBCFS_SET_HEALHV: {
3893                 struct lnet_ioctl_reset_health_cfg *cfg = arg;
3894                 int value;
3895                 if (cfg->rh_hdr.ioc_len < sizeof(*cfg))
3896                         return -EINVAL;
3897                 if (cfg->rh_value < 0 ||
3898                     cfg->rh_value > LNET_MAX_HEALTH_VALUE)
3899                         value = LNET_MAX_HEALTH_VALUE;
3900                 else
3901                         value = cfg->rh_value;
3902                 CDEBUG(D_NET, "Manually setting healthv to %d for %s:%s. all = %d\n",
3903                        value, (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI) ?
3904                        "local" : "peer", libcfs_nid2str(cfg->rh_nid), cfg->rh_all);
3905                 mutex_lock(&the_lnet.ln_api_mutex);
3906                 if (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI)
3907                         lnet_ni_set_healthv(cfg->rh_nid, value,
3908                                              cfg->rh_all);
3909                 else
3910                         lnet_peer_ni_set_healthv(cfg->rh_nid, value,
3911                                                   cfg->rh_all);
3912                 mutex_unlock(&the_lnet.ln_api_mutex);
3913                 return 0;
3914         }
3915
3916         case IOC_LIBCFS_NOTIFY_ROUTER: {
3917                 time64_t deadline = ktime_get_real_seconds() - data->ioc_u64[0];
3918
3919                 /* The deadline passed in by the user should be some time in
3920                  * seconds in the future since the UNIX epoch. We have to map
3921                  * that deadline to the wall clock.
3922                  */
3923                 deadline += ktime_get_seconds();
3924                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags, false,
3925                                    deadline);
3926         }
3927
3928         case IOC_LIBCFS_LNET_DIST:
3929                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
3930                 if (rc < 0 && rc != -EHOSTUNREACH)
3931                         return rc;
3932
3933                 data->ioc_u32[0] = rc;
3934                 return 0;
3935
3936         case IOC_LIBCFS_TESTPROTOCOMPAT:
3937                 the_lnet.ln_testprotocompat = data->ioc_flags;
3938                 return 0;
3939
3940         case IOC_LIBCFS_LNET_FAULT:
3941                 return lnet_fault_ctl(data->ioc_flags, data);
3942
3943         case IOC_LIBCFS_PING: {
3944                 signed long timeout;
3945
3946                 id.nid = data->ioc_nid;
3947                 id.pid = data->ioc_u32[0];
3948
3949                 /* If timeout is negative then set default of 3 minutes */
3950                 if (((s32)data->ioc_u32[1] <= 0) ||
3951                     data->ioc_u32[1] > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3952                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3953                 else
3954                         timeout = nsecs_to_jiffies(data->ioc_u32[1] * NSEC_PER_MSEC);
3955
3956                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
3957                                data->ioc_plen1 / sizeof(struct lnet_process_id));
3958
3959                 if (rc < 0)
3960                         return rc;
3961
3962                 data->ioc_count = rc;
3963                 return 0;
3964         }
3965
3966         case IOC_LIBCFS_PING_PEER: {
3967                 struct lnet_ioctl_ping_data *ping = arg;
3968                 struct lnet_peer *lp;
3969                 signed long timeout;
3970
3971                 /* If timeout is negative then set default of 3 minutes */
3972                 if (((s32)ping->op_param) <= 0 ||
3973                     ping->op_param > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
3974                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
3975                 else
3976                         timeout = nsecs_to_jiffies(ping->op_param * NSEC_PER_MSEC);
3977
3978                 rc = lnet_ping(ping->ping_id, timeout,
3979                                ping->ping_buf,
3980                                ping->ping_count);
3981                 if (rc < 0)
3982                         return rc;
3983
3984                 mutex_lock(&the_lnet.ln_api_mutex);
3985                 lp = lnet_find_peer(ping->ping_id.nid);
3986                 if (lp) {
3987                         ping->ping_id.nid = lp->lp_primary_nid;
3988                         ping->mr_info = lnet_peer_is_multi_rail(lp);
3989                         lnet_peer_decref_locked(lp);
3990                 }
3991                 mutex_unlock(&the_lnet.ln_api_mutex);
3992
3993                 ping->ping_count = rc;
3994                 return 0;
3995         }
3996
3997         case IOC_LIBCFS_DISCOVER: {
3998                 struct lnet_ioctl_ping_data *discover = arg;
3999                 struct lnet_peer *lp;
4000
4001                 rc = lnet_discover(discover->ping_id, discover->op_param,
4002                                    discover->ping_buf,
4003                                    discover->ping_count);
4004                 if (rc < 0)
4005                         return rc;
4006
4007                 mutex_lock(&the_lnet.ln_api_mutex);
4008                 lp = lnet_find_peer(discover->ping_id.nid);
4009                 if (lp) {
4010                         discover->ping_id.nid = lp->lp_primary_nid;
4011                         discover->mr_info = lnet_peer_is_multi_rail(lp);
4012                         lnet_peer_decref_locked(lp);
4013                 }
4014                 mutex_unlock(&the_lnet.ln_api_mutex);
4015
4016                 discover->ping_count = rc;
4017                 return 0;
4018         }
4019
4020         default:
4021                 ni = lnet_net2ni_addref(data->ioc_net);
4022                 if (ni == NULL)
4023                         return -EINVAL;
4024
4025                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
4026                         rc = -EINVAL;
4027                 else
4028                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
4029
4030                 lnet_ni_decref(ni);
4031                 return rc;
4032         }
4033         /* not reached */
4034 }
4035 EXPORT_SYMBOL(LNetCtl);
4036
4037 void LNetDebugPeer(struct lnet_process_id id)
4038 {
4039         lnet_debug_peer(id.nid);
4040 }
4041 EXPORT_SYMBOL(LNetDebugPeer);
4042
4043 /**
4044  * Determine if the specified peer \a nid is on the local node.
4045  *
4046  * \param nid   peer nid to check
4047  *
4048  * \retval true         If peer NID is on the local node.
4049  * \retval false        If peer NID is not on the local node.
4050  */
4051 bool LNetIsPeerLocal(lnet_nid_t nid)
4052 {
4053         struct lnet_net *net;
4054         struct lnet_ni *ni;
4055         int cpt;
4056
4057         cpt = lnet_net_lock_current();
4058         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4059                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4060                         if (ni->ni_nid == nid) {
4061                                 lnet_net_unlock(cpt);
4062                                 return true;
4063                         }
4064                 }
4065         }
4066         lnet_net_unlock(cpt);
4067
4068         return false;
4069 }
4070 EXPORT_SYMBOL(LNetIsPeerLocal);
4071
4072 /**
4073  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
4074  * Note that all interfaces share a same PID, as requested by LNetNIInit().
4075  *
4076  * \param index Index of the interface to look up.
4077  * \param id On successful return, this location will hold the
4078  * struct lnet_process_id ID of the interface.
4079  *
4080  * \retval 0 If an interface exists at \a index.
4081  * \retval -ENOENT If no interface has been found.
4082  */
4083 int
4084 LNetGetId(unsigned int index, struct lnet_process_id *id)
4085 {
4086         struct lnet_ni   *ni;
4087         struct lnet_net  *net;
4088         int               cpt;
4089         int               rc = -ENOENT;
4090
4091         LASSERT(the_lnet.ln_refcount > 0);
4092
4093         cpt = lnet_net_lock_current();
4094
4095         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4096                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4097                         if (index-- != 0)
4098                                 continue;
4099
4100                         id->nid = ni->ni_nid;
4101                         id->pid = the_lnet.ln_pid;
4102                         rc = 0;
4103                         break;
4104                 }
4105         }
4106
4107         lnet_net_unlock(cpt);
4108         return rc;
4109 }
4110 EXPORT_SYMBOL(LNetGetId);
4111
4112 struct ping_data {
4113         int rc;
4114         int replied;
4115         struct lnet_handle_md mdh;
4116         struct completion completion;
4117 };
4118
4119 static void
4120 lnet_ping_event_handler(struct lnet_event *event)
4121 {
4122         struct ping_data *pd = event->md_user_ptr;
4123
4124         CDEBUG(D_NET, "ping event (%d %d)%s\n",
4125                event->type, event->status,
4126                event->unlinked ? " unlinked" : "");
4127
4128         if (event->status) {
4129                 if (!pd->rc)
4130                         pd->rc = event->status;
4131         } else if (event->type == LNET_EVENT_REPLY) {
4132                 pd->replied = 1;
4133                 pd->rc = event->mlength;
4134         }
4135         if (event->unlinked)
4136                 complete(&pd->completion);
4137 }
4138
4139 static int lnet_ping(struct lnet_process_id id, signed long timeout,
4140                      struct lnet_process_id __user *ids, int n_ids)
4141 {
4142         struct lnet_md md = { NULL };
4143         struct ping_data pd = { 0 };
4144         struct lnet_ping_buffer *pbuf;
4145         struct lnet_process_id tmpid;
4146         int i;
4147         int nob;
4148         int rc;
4149         int rc2;
4150
4151         /* n_ids limit is arbitrary */
4152         if (n_ids <= 0 || id.nid == LNET_NID_ANY)
4153                 return -EINVAL;
4154
4155         /*
4156          * if the user buffer has more space than the lnet_interfaces_max
4157          * then only fill it up to lnet_interfaces_max
4158          */
4159         if (n_ids > lnet_interfaces_max)
4160                 n_ids = lnet_interfaces_max;
4161
4162         if (id.pid == LNET_PID_ANY)
4163                 id.pid = LNET_PID_LUSTRE;
4164
4165         pbuf = lnet_ping_buffer_alloc(n_ids, GFP_NOFS);
4166         if (!pbuf)
4167                 return -ENOMEM;
4168
4169         /* initialize md content */
4170         md.start     = &pbuf->pb_info;
4171         md.length    = LNET_PING_INFO_SIZE(n_ids);
4172         md.threshold = 2; /* GET/REPLY */
4173         md.max_size  = 0;
4174         md.options   = LNET_MD_TRUNCATE;
4175         md.user_ptr  = &pd;
4176         md.handler   = lnet_ping_event_handler;
4177
4178         init_completion(&pd.completion);
4179
4180         rc = LNetMDBind(&md, LNET_UNLINK, &pd.mdh);
4181         if (rc != 0) {
4182                 CERROR("Can't bind MD: %d\n", rc);
4183                 goto fail_ping_buffer_decref;
4184         }
4185
4186         rc = LNetGet(LNET_NID_ANY, pd.mdh, id,
4187                      LNET_RESERVED_PORTAL,
4188                      LNET_PROTO_PING_MATCHBITS, 0, false);
4189
4190         if (rc != 0) {
4191                 /* Don't CERROR; this could be deliberate! */
4192                 rc2 = LNetMDUnlink(pd.mdh);
4193                 LASSERT(rc2 == 0);
4194
4195                 /* NB must wait for the UNLINK event below... */
4196         }
4197
4198         if (wait_for_completion_timeout(&pd.completion, timeout) == 0) {
4199                 /* Ensure completion in finite time... */
4200                 LNetMDUnlink(pd.mdh);
4201                 wait_for_completion(&pd.completion);
4202         }
4203         if (!pd.replied) {
4204                 rc = -EIO;
4205                 goto fail_ping_buffer_decref;
4206         }
4207
4208         nob = pd.rc;
4209         LASSERT(nob >= 0 && nob <= LNET_PING_INFO_SIZE(n_ids));
4210
4211         rc = -EPROTO;           /* if I can't parse... */
4212
4213         if (nob < 8) {
4214                 CERROR("%s: ping info too short %d\n",
4215                        libcfs_id2str(id), nob);
4216                 goto fail_ping_buffer_decref;
4217         }
4218
4219         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
4220                 lnet_swap_pinginfo(pbuf);
4221         } else if (pbuf->pb_info.pi_magic != LNET_PROTO_PING_MAGIC) {
4222                 CERROR("%s: Unexpected magic %08x\n",
4223                        libcfs_id2str(id), pbuf->pb_info.pi_magic);
4224                 goto fail_ping_buffer_decref;
4225         }
4226
4227         if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
4228                 CERROR("%s: ping w/o NI status: 0x%x\n",
4229                        libcfs_id2str(id), pbuf->pb_info.pi_features);
4230                 goto fail_ping_buffer_decref;
4231         }
4232
4233         if (nob < LNET_PING_INFO_SIZE(0)) {
4234                 CERROR("%s: Short reply %d(%d min)\n",
4235                        libcfs_id2str(id),
4236                        nob, (int)LNET_PING_INFO_SIZE(0));
4237                 goto fail_ping_buffer_decref;
4238         }
4239
4240         if (pbuf->pb_info.pi_nnis < n_ids)
4241                 n_ids = pbuf->pb_info.pi_nnis;
4242
4243         if (nob < LNET_PING_INFO_SIZE(n_ids)) {
4244                 CERROR("%s: Short reply %d(%d expected)\n",
4245                        libcfs_id2str(id),
4246                        nob, (int)LNET_PING_INFO_SIZE(n_ids));
4247                 goto fail_ping_buffer_decref;
4248         }
4249
4250         rc = -EFAULT;           /* if I segv in copy_to_user()... */
4251
4252         memset(&tmpid, 0, sizeof(tmpid));
4253         for (i = 0; i < n_ids; i++) {
4254                 tmpid.pid = pbuf->pb_info.pi_pid;
4255                 tmpid.nid = pbuf->pb_info.pi_ni[i].ns_nid;
4256                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
4257                         goto fail_ping_buffer_decref;
4258         }
4259         rc = pbuf->pb_info.pi_nnis;
4260
4261  fail_ping_buffer_decref:
4262         lnet_ping_buffer_decref(pbuf);
4263         return rc;
4264 }
4265
4266 static int
4267 lnet_discover(struct lnet_process_id id, __u32 force,
4268               struct lnet_process_id __user *ids, int n_ids)
4269 {
4270         struct lnet_peer_ni *lpni;
4271         struct lnet_peer_ni *p;
4272         struct lnet_peer *lp;
4273         struct lnet_process_id *buf;
4274         int cpt;
4275         int i;
4276         int rc;
4277
4278         if (n_ids <= 0 ||
4279             id.nid == LNET_NID_ANY)
4280                 return -EINVAL;
4281
4282         if (id.pid == LNET_PID_ANY)
4283                 id.pid = LNET_PID_LUSTRE;
4284
4285         /*
4286          * If the user buffer has more space than the lnet_interfaces_max,
4287          * then only fill it up to lnet_interfaces_max.
4288          */
4289         if (n_ids > lnet_interfaces_max)
4290                 n_ids = lnet_interfaces_max;
4291
4292         CFS_ALLOC_PTR_ARRAY(buf, n_ids);
4293         if (!buf)
4294                 return -ENOMEM;
4295
4296         cpt = lnet_net_lock_current();
4297         lpni = lnet_nid2peerni_locked(id.nid, LNET_NID_ANY, cpt);
4298         if (IS_ERR(lpni)) {
4299                 rc = PTR_ERR(lpni);
4300                 goto out;
4301         }
4302
4303         /*
4304          * Clearing the NIDS_UPTODATE flag ensures the peer will
4305          * be discovered, provided discovery has not been disabled.
4306          */
4307         lp = lpni->lpni_peer_net->lpn_peer;
4308         spin_lock(&lp->lp_lock);
4309         lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
4310         /* If the force flag is set, force a PING and PUSH as well. */
4311         if (force)
4312                 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
4313         spin_unlock(&lp->lp_lock);
4314         rc = lnet_discover_peer_locked(lpni, cpt, true);
4315         if (rc)
4316                 goto out_decref;
4317
4318         i = 0;
4319         p = NULL;
4320         while ((p = lnet_get_next_peer_ni_locked(lp, NULL, p)) != NULL) {
4321                 buf[i].pid = id.pid;
4322                 buf[i].nid = p->lpni_nid;
4323                 if (++i >= n_ids)
4324                         break;
4325         }
4326         rc = i;
4327
4328 out_decref:
4329         lnet_peer_ni_decref_locked(lpni);
4330 out:
4331         lnet_net_unlock(cpt);
4332
4333         if (rc >= 0)
4334                 if (copy_to_user(ids, buf, rc * sizeof(*buf)))
4335                         rc = -EFAULT;
4336         CFS_FREE_PTR_ARRAY(buf, n_ids);
4337
4338         return rc;
4339 }
4340
4341 /**
4342  * Retrieve peer discovery status.
4343  *
4344  * \retval 1 if lnet_peer_discovery_disabled is 0
4345  * \retval 0 if lnet_peer_discovery_disabled is 1
4346  */
4347 int
4348 LNetGetPeerDiscoveryStatus(void)
4349 {
4350         return !lnet_peer_discovery_disabled;
4351 }
4352 EXPORT_SYMBOL(LNetGetPeerDiscoveryStatus);